- Type of paper
: Paper in book
Title: FORESTRY MACHINES
- Authors:
- Sever, Stanislav (43066)
- Editors
- Požar, Hrvoje
- Štefanović, D.
Publisher: Leksikografski zavod "Miroslav Krleža"
Year: 1992
Pages: from 519 to 531
Number of references: 18
Language: hrvatski
- Type of paper
: Paper in book
Title: "Croatian Forests" '93-yearbook in word, pictures and
figures
- Authors:
- Horvat, Dubravko (16384)
- Martinić, Ivan (136986)
- Sever, Stanislav (43066)
- Editors
- Sever, Stanislav (43066)
Publisher: "Hrvatske šume", javno poduzeće za gospodarenje šumama i šumskim zemljištima u Republici Hrvatskoj
Year: 1993
Pages: from 1 to 44
Language: hrvatski
- Type of paper
: Paper in book
Title: Public Enterprise "Hrvatske šume" '93 ("Croatian Forests"
'93)-yearbook in words, pictures and figures
- Authors:
- Horvat, Dubravko (16384)
- Martinić, Ivan (136986)
- Sever, Stanislav (43066)
- Editors
- Sever, Stanislav (43066)
Publisher: "Hrvatske šume", javno poduzeće za gospodarenje šumama i šumskim zemljištima u Republici Hrvatskoj
Year: 1994
Pages: from 1 to 44
Language: engleski
- Type of paper
: Paper in journal
Title: DAMAGE TO STANDS OF TREES IN THE FELLING, PROCESSING AND
HAULING OF TIMBER
- Authors:
- Martinić, Ivan (136986)
Journal: Šumarski list
Number: 1
ISSN: 0373-1332
Volume: 115
Year: 1991
Pages: from 33 to 47
Number of references: 16
Language: hrvatski
Summary: This article deals with research data on the damage to
stands oftrees caused by the felling, processing and hauling of timber ina
47-year-old stand consisting of beech, bay oak and hornbeam onBilogora.
Five methods were compared for the cutting and haulingtimber. Indices of
tree damage were as follows: economicimportance, tree location, cause of
damage, type and site ofdamage, extent of damaged bark and condition of
damaged tree. Theamplitude of damage is indicated by the ratio between the
numberof damaged trees and all remaining trees in the stand. Theseelements
were confirmed for 24 examples of surfaces aftercompletion of work. In the
cutting, processing and hauling oftimber, 8,2 % of the remaining trees were
damaged. Damage due tothe cutting and processing of timber had
significantly moreserious consequences than that caused by hauling.
Keywords: tree harvesting, processing and hauling of timber, damaged stands, forest equipment, volume of damage, type of damage
- Type of paper
: Paper in journal
Title: INTERACTIONS OF WORK METHODS, WORKING CONDITIONS AND WORK
PRODUCTIVITY IN WOOD FELLING AND PROCESSING IN THINNING
- Authors:
- Martinić, Ivan (136986)
Journal: Glasnik za šumske pokuse
ISSN: 0352-3861
Volume: 28
Year: 1992
Pages: from 133 to 178
Number of references: 58
Language: hrvatski
Summary: The following work factors have been studied for four
methods offelling and processing of wood in thinnings: work
productivity,fuel consumption of power saw, daily noise exposure of
workers,tree damage in felling, primary wood conversion and skidding.Field
research was carried out in a 47-year-old montane mixedstand. Detailed
survey encompassed 1542 trees within 47 workingdays (272 workers-days). The
consumption of fuel and lubricationoil per 1 m3 decreases with greater
proportion of multi-meterstacked wood in m3 of processed timber and longer
woodassortiments. With all methods of felling and processing, dailywork
with power saw (99-164 min) was within the allowed limitis.The average
daily noise exposure of a worker was 100 db(A). Infelling, primary wood
conversion and skidding of timber 8,2 % ofthe remaining trees were damage.
The size of damage grows inproportion with higher mechanization. The size
and structure ofthe damage depend on the skidding equipment, the way of
formingthe load and the art of hauled assortments.
Keywords: felling, skidding, work study, work productivity, time consumption, fuel consumption, noise exposure, forest stand damage, work teams, forest operations, power saw time
- Type of paper
: Paper in journal
Title: SOME FACTS RELATED TO FOREST OPERATIONS
- Authors:
- Martinić, Ivan (136986)
Journal: Glasnik za šumske pokuse
ISSN: 0352-3861
Volume: 29
Year: 1993
Pages: from 321 to 330
Number of references: 15
Language: hrvatski
Summary: The paper is a summarized presentation of the joint
research ondifferent issues related to forest work in Croatia. Discussed
arethe trends and the volume of the work on the biological
forestreproduction. Based on physical and financial indices of theannual
plan of a forest management, the possibilities forsatisfying the increasing
needs for biological reproduction ofthe forest have been evaluated. Further
on, there are the resultsof studying the physical exortion of forest
workers duringhabitat preparation and young trees care. New knowledge on
someconsequences of applying machines and equipment in forestryproduction
has been analyzed. It has been established that about15 % of trees are
damaged when the existing technologies andorganization of forest operations
are existing technologies andorganization of forest operations are applied.
About one third ishigh increment-reducing damage. Thus is the stand value
reducedby less than 2 %.
Keywords: forest operations, biological reproduction of forest, physical exertion of forest workers, tree damage volume, financial consequences, production costs, silvicultural work operations
- Type of paper
: Paper in journal
Title: FORESTRY WORK IN TRANSITION-SVEDISH VISION OF DEVELOPMENT
- Authors:
- Martinić, Ivan (136986)
Journal: Mehanizacija šumarstva
Number: 3
ISSN: 0352-5406
Volume: 18
Year: 1993
Pages: from 135 to 142
Number of references: 14
Language: hrvatski
Summary: A long-term possible enhancement of the forest
workproductability through mechanization has greatly been exhausted.Further
improvement seems to lie in more productible human workin the forest.
However, it is the human resources that willincrease the forest work
productability above the expected 20 %.Such targets will be reached by
those who will be able to offerthe work forms that will exploit the great
worker's capacitiesand also to meet their sophisticated requirements.
Swedishforestry science is as usual ahead of others in suggesting theways
towards these targets.
Keywords: Swedish forestry, forestry work, accidents among forest workers, teamwork, forest equipment, ergonomics, level of mechanization, work study
- Type of paper
: Paper in journal
Title: PHYSICAL EXERTION OF WORKERS WHILE OPERATING THE STIHL BT
308 MOTOR DRILL AND PORTABLE BRUSH SAW STIHL FS 360
- Authors:
- Martinić, Ivan (136986)
Journal: Mehanizacija šumarstva
Number: 4
ISSN: 0352-5406
Volume: 18
Year: 1993
Pages: from 179 to 189
Number of references: 20
Language: hrvatski
Summary: The paper is a report on the research of physical exertion
ofworkers while operating the Stihl BT 308 drill device andcleaning stands
with the Stihl FS 360 portable brush saw. Theresearch was carried out
through both lab and field measurements.The field survey took several days
encompassing work study andheart rate measurement made every minute by
means of"Respironics" electrical pulse-meter. The research results referto
manual work effect, normal working time and evaluation of thephysical
exertion based on average heart rate during working timeand calculated
energy consumption.
Keywords: physical exertion, heart rate, energy consumption, soil drill, brush saw, forest operation, normal working time, work effect, delay,work study, time study, ergonomics
- Type of paper
: Paper in journal
Title: EFFICIENCY OF CRANED TRACTOR TRAILERS IN LOGGING
- Authors:
- Martinić, Ivan (136986)
- Tomanić, Simeun
- Vondra, Vencl (70055)
Journal: Mehanizacija šumarstva
Number: 1
ISSN: 0352-5406
Volume: 17
Year: 1992
Pages: from 15 to 22
Number of references: 13
Language: hrvatski
Summary: The work of craned tractor trailers in logging was
investigatedin the conditions of flatland peduncled oak and ash forests.
Onehundred and eight hauling cycles were encompassed by a detailedsurvey,
whereas 495 cycles were contained within 160aggregate/days. The research
results are the average values oftotal time, work efficiency and spent fuel
- for one haulingcycle. Mathematical models were made for the calculation
of fuelconsumption.
Keywords: logging, tractor trailer, producibility, fuel consumption, forest operations, planning, work effects
- Type of paper
: Paper in journal
Title: FOREST OPERATIONS PLANNING - WE DO IT WITH MODERN
TECHNOLOGIES
- Authors:
- Martinić, Ivan (136986)
Journal: Mehanizacija šumarstva
ISSN: 0352-5406
Volume: 18
Year: 1993
Pages: from 17 to 21
Number of references: 9
Language: hrvatski
Summary: A paper consists of report from IUFRO International
conferenceand workshop on "Computer Supported Planning of Roads
andHarvesting", organized in Feldafing (Germany), from August 17-22,1992. A
paper present describes GIS concept, terminology anddemand for forest
operations planning. It describes review of themost interest software for
computer-aided opening of foreststands, computing technicque, decision
support systems forharvesting.
Keywords: forest operations, harvesting, skidding, computer support, planning software, GIS, decision support system
- Type of paper
: Paper in journal
Title: MATHEMATICAL MODEL FOR DETERMINATION OF HEAT QUANTITY OF
FOREST BIOMASS
- Authors:
- Sever, Stanislav (43066)
- Horvat, Dubravko (16384)
- Risović, Stjepan
- Jakupović, Esad
Journal: Glasnik za šumske pokuse
ISSN: 0352-3861
Volume: 29
Year: 1993
Pages: from 305 to 313
Number of references: 12
Language: hrvatski
Summary: The paper discasses the principles of a mathematical model
forevolution of the energy potential of the forest biomass. Out of anumber
of theoretically different aspects to mathematicalmodelling of the biomass
in terms of its energy use, a method hasbeen chosen whereby the different
factors can be analyzed andcalculated. The checking of the model has been
done on a smallsample of common spruce (Picea abies), thus the given
examplealso refers to these results. The results may help at fastdecisions
on how appropriate the forest biomass is to be used ingenerating enrgy.
Keywords: mathematical model, heat quantity, spruce stand
- Type of paper
: Paper in journal
Title: A CONTRIBUTION TO THE DETERMINATION OF UNCERTAINTY OF A
COMPLEX MODEL
- Authors:
- Sever, Stanislav (43066)
- Horvat, Dubravko (16384)
Journal: Glasnik za šumske pokuse
ISSN: 0352-3861
Volume: 29
Year: 1993
Pages: from 295 to 304
Number of references: 24
Language: hrvatski
Summary: The paper deals with the problem of evaluating the
uncertaintyof complex model results. Since the input data of any model
arecertain measurement results, i.e. a value of a physical
quantitydetermined by measurement, the evaluation marking the range ofthe
value containing the real value of the measurand will beconsidered
uncertanity of the result established by a model. Thesuggested procedure is
complex and will in further elaborationrequire a creation of a computer
program for supporting theprocessing course.
Keywords: uncertainty of measurement, uncertainty of results of mathematical model
- Type of paper
: Paper in journal
Title: A Contribution to Comprehension of the Bogie Wheel System
Dynamics
- Authors:
- Horvat, Dubravko (16384)
Journal: Mehanizacija šumarstva
Number: 3
ISSN: 0352-5406
Volume: 18
Year: 1993
Pages: from 107 to 120
Number of references: 45
Language: hrvatski
Summary: Forwarders are special, among other things, also for
employingthe bogie wheels, a specific pendling tandem system,
whichincreases their lateral stability and decreases the groundpressure.
This pendling system causes the deferences in weightsand torque
distrubutions between the front and the rear wheels.This paper deals with
theoreticall and experimentall analize ofdynamics for the bogie system.
Keywords: wood transportation, forwarders, bogie wheel system, dynamics
- Type of paper
: Paper in journal
Title: THE EFFECT OF PERSONAL WORK IN THE SELECTIVE MIDDLE-AGED
FLATLAND FOREST STANDS
- Authors:
- Vondra, Vencl (70055)
- Tomanić, Simeun
- Martinić, Ivan (136986)
- Novak, Željko
- Zovak, Tihomir
Journal: Mehanizacija šumarstva
Number: 1
ISSN: 0352-5406
Volume: 17
Year: 1992
Pages: from 3 to 14
Number of references: 13
Language: hrvatski
Summary: One phase of the complex research on work organization
inselective forest stands consisted of investigating the existingsituation
in the felling and primary wood processing phase. Wehave developed a model
for evaluating the degree of physicalexertion of the workers during the
investigated ways of work. Thepresented results are one part of the complex
work research. Asynthesis of the total results should serve as a scientific
basein the development of work organizations
Keywords: Felling and processing, selection forests, work study, exertion of workers, work producibility, fuel consumption.
- Type of paper
: Paper in journal
Title: QUALIFICATION OF FORESTRY ENGINEERS - NEEDS FOR INTEGRAL
DEVELOPMENT OF CROATIAN FORESTRY
- Authors:
- Vondra, Vencl (70055)
Journal: Glasnik za šumske pokuse
ISSN: 0352-3861
Volume: 29
Year: 1993
Pages: from 331 to 346
Number of references: 15
Language: hrvatski
Summary: Diploma theses have been analyzed in order to reveal
theinteractions among the degrees of development in forestry,
itsadvancement and qualification of new forestry engineers forefective
specialist work. The research encompassed 571 diplomatheses publicly
defended at Faculty of Forestry in Zagreb in theperiod from 1982 until
August 1992. The analysis was publishedaccording to 17 indices.
Keywords: forestry staff, education of forestry engineers, development of forestry, diploma theses
- Type of paper
: Paper in journal
Title: FUNDATIONS FOR MORE OBJECTIVE CALCULATIONS OF CHAIN SAW
OPERATING COSTS PRICES
- Authors:
- Vondra, Vencl (70055)
Journal: Mehanizacija šumarstva
Number: 2
ISSN: 0352-5406
Volume: 18
Year: 1993
Pages: from 47 to 59
Number of references: 17
Language: hrvatski
Summary: Aims and tasks of the study were to check, using the
research onthe felling and processing of wood conducted so far, as the
wellas the convenience of the foundations set for work planning
andobjective calculation of the chain saw operating cost prices.Information
gained by the analyses may help in deciding on thefuture development of the
technology, work methods and means inforest exploitation and the forestry
of Croatia.
Keywords: wood felling and processing, power saw, fuel and lubricants, power time of saw operating
- Type of paper
: Paper in journal
Title: OPERATIONAL MANAGEMENT OF EXTRAORDINARY FOREST OPERATIONS
- Authors:
- Tomanić, Simeun
- Martinić, Ivan (136986)
Journal: Mehanizacija šumarstva
Number: 4
ISSN: 0352-5406
Volume: 18
Year: 1993
Pages: from 191 to 196
Number of references: 8
Language: hrvatski
Summary: Extraordinary forest operations occur frequentlt. Their aim
is toimprove or to utilize effects of extraordinary conditions. Thisarticle
deals with the concept of extraordinary conditions,methods and work
techniques in extraordinary conditions,management and decision-making in
extraordinary forestoperations. Particular attention is drawn to criterias
forselections of workers and managers in extraordinary forestoperations,
and to unexpected extraordinary operations performedby workers and managers
not specifically trained for such work.
Keywords: Extraordinary conditions in forestry, operational management of extraordinary forest operations, decision malaing thinker, forest operations
- Type of paper
: Paper in journal
Title: THREE LEVELS OF APPLYING THE WORK STUDY TO CROATIA
FORESTRY
- Authors:
- Martinić, Ivan (136986)
Journal: Mehanizacija šumarstva
Number: 3
ISSN: 0352-5406
Volume: 17
Year: 1992
Pages: from 75 to 77
Number of references: 20
Language: hrvatski
Summary: The paper analyzes the characteristics of the work study in
theforestry of the Republic of Croatia. According to theorganizational
structure of forestry, the contents, level andbearers of the work study
have been defined. The local of workstudy encompasses solution of simple
tasks by standardizedmethods. On the regional level, complex tasks will be
solvedglobally, practical experts and research specialist fromscientific
institutions being common bearers. The general levelof work study refers to
strategic tasks. Such tasks require aninterdisciplinary approach,
non-standard methods of research andteams of experienced scientists and
research specialist.
Keywords: work study, 3E technologies, research teams, experiments, decision support system
- Type of paper
: Paper in journal
Title: tHE FIRST CONFERENCE OF IUFRO GROUP P6.03: ECOLOGICAL
ECONOMY IN FORESTRY
- Authors:
- Sever, Stanislav (43066)
Journal: Šumarski list
Number: 10
ISSN: 0373-1332
Volume: 115
Year: 1991
Pages: from 542 to 547
Number of references: 20
Language: hrvatski
- Type of paper
: Paper in journal
Title: STANDARDIZING AND STANDARDIZATION
- Authors:
- Sever, Stanislav (43066)
Journal: Mjeriteljski vjesnik
Number: 2
ISSN: 0352-5813
Volume: 9
Year: 1991
Pages: from 1251 to 1251
Number of references: 2
Language: hrvatski
- Type of paper
: Paper in journal
Title: STANDARDIZATION AND LANGUAGE OF YU-STANDARDS
- Authors:
- Sever, Stanislav (43066)
Journal: Mjeriteljski vjesnik
Number: 6
ISSN: 0352-5813
Volume: 9
Year: 1991
Pages: from 1413 to 1415
Number of references: 8
Language: hrvatski
- Type of paper
: Paper in journal
Title: DICTIONARY OF DIFFERENCES BETWEEN SERBIAN AND CROATIAN
LANGUAGE
- Authors:
- Sever, Stanislav (43066)
Journal: Mjeriteljski vjesnik
Number: 6
ISSN: 0352-5813
Volume: 9
Year: 1991
Pages: from 1418 to 1419
Language: hrvatski
- Type of paper
: Paper in journal
Title: BEGINNING OF SIXTEEN VOLUME
- Authors:
- Sever, Stanislav (43066)
Journal: Mehanizacija šumarstva
Number: 1
ISSN: 0352-5406
Volume: 16
Year: 1991
Pages: from 2 to 2
Language: hrvatski
- Type of paper
: Paper in journal
Title: COMPUTER-AIDED DETERMINATION OF OPTIMAL DENSITY OF SKID
TRAILS WITH CONSTANT DENSITY OF LORRY ROADS
- Authors:
- Knežević, Ivo (21470)
- Sever, Stanislav (43066)
Journal: Mehanizacija šumarstva
Number: 3
ISSN: 0352-5406
Volume: 17
Year: 1992
Pages: from 41 to 51
Number of references: 28
Language: hrvatski
Summary: Determination of gravitation areas and skidding directions
inforest stand at felling assignment may accelerate the procedureof
establishing the optimal density of tractor skid trails andtheir spacing.
The problem has been studied with constant densityof lorry roads.
Keywords: gravitation area, sectro, gravity centre of sector, weighted average skidding distance
- Type of paper
: Paper in journal
Title: NORMALIZATION, STANDARDIZATION, STANDARDIZING,
STANDARDATION
- Authors:
- Sever, Stanislav (43066)
Journal: Mjeriteljski vjesnik
Number: 3
ISSN: 0352-5813
Volume: 10
Year: 1992
Pages: from 1528 to 1533
Number of references: 14
Language: hrvatski
- Type of paper
: Paper in journal
Title: A SUPPLEMENT TO THE DETERMINATION OF THE FOREST ROAD
OPTIMAL DENSITY IN THE SELECTION FORESTS OF GORSKI KOTAR
- Authors:
- Knežević, Ivo (21470)
Journal: Mehanizacija šumarstva
Number: 1
ISSN: 0352-5406
Volume: 16
Year: 1991
Pages: from 11 to 15
Number of references: 9
Language: hrvatski
Summary: The usual method of determining the optimal density of
forestroads, reduced to minimizing transport expenses as to thedistance
between the roads, may now be improwed by determinationof the functional
forms of dependance of the actual haulingduring the change of the actual
road density over a forest area,and the dependencies of the mean hauling
distance on the haulingdistances per individual hauling tracks.
Keywords: mean hauling distance on ground, skidding track density
- Type of paper
: Paper in journal
Title: THE IMPACT OF MANAGEMENT METHODS ON THE FOREST ROAD
OPTIMAL DENSITY IN THE GORSKI KOTAR SELECTION FORESTS
- Authors:
- Knežević, Ivo (21470)
- Pičman, Dragutin
- Jakovac, Hranislav
Journal: Mehanizacija šumarstva
Number: 1
ISSN: 0352-5406
Volume: 16
Year: 1991
Pages: from 16 to 19
Number of references: 5
Language: hrvatski
Summary: The management method in the selection forests of Gorski
kotarinfluences the irregularity of the felling volume distributionover the
whole department area. This is particulary the case inmanagement of the
concentrated felling, such as the so-calledcircle cut. By establishing the
gravitation areas, which throughtheir real felling volume and the distance
from the gravitationpoint to the lorry track, considerably influence the
mean haulingdistance, it is possible to obtain the distances of
theindividual strip roads and their distribution in the felling areaby
gradual planning and building of new strip roads. The obtaineddistances of
the individual stip roads and their sdistributionare used for calculation
of the parameters by the Arnautović.
Keywords: gradual designing of skidding tracks, optimal mean distance to skidding tracks, optimal skidding track density
- Type of paper
: Paper in journal
Title: UNEVENNESS OF THE DEPARTMENT FELLING INTENSITY - A FACTOR
IN DETERMINING THE MEAN HAULING DISTANCE IN THE GORSKI KOTAR SELECTION
FOREST
- Authors:
- Knežević, Ivo (21470)
- Pičman, Dragutin
- Jakovac, Hranislav
Journal: Mehanizacija šumarstva
Number: 1
ISSN: 0352-5406
Volume: 16
Year: 1991
Pages: from 20 to 24
Number of references: 5
Language: hrvatski
Summary: While establishing a forest road neetwork of optimal
density withleast total transportation costs, even and regular
distributionof felling volume over the whole department surface is one of
theassumptions. Since this assumption is fulfilled in the
presentcircumstances of selection forests, particulary in groupwise
andfelling-concentrated managements, gradual elimination of thehighest
ground-skidding to the tracks or roadside landing bybuilding of new
skidding tracks has been presented in this paper.By analyzing the sum of
the products of actual felling volume onthe elementary surfaces and the
skidding distances to theroadsize landings or tracks, and by establishing
thegravitational areas that will by means of track-building
reallycontribute to the reduction of the mean ground-skidding
distance,special skidding tracks distribution over the department
surfacewill be achieved.
Keywords: selection forest, unevennes of cutting intesity, gravitation area, felling concentration
- Type of paper
: Paper in journal
Title: ESTABLISHMENT OF LANGUAGE NORM AND THE TERMINOLOGY USED IN
THE PROCESS
- Authors:
- Sever, Stanislav (43066)
Journal: Jezik
Number: 1
ISSN: 0021-6925
Volume: 39
Year: 1991
Pages: from 14 to 16
Number of references: 12
Language: hrvatski
Summary: The author advocates the use of the term "normiranje" in
thesense of standard, also dealing with share of Croatin terminologyin the
Yugoslav normativist nomenclature.
- Type of paper
: Paper in journal
Title: STATUS AND POSSIBLE DEVELOPMENT OF MECHANIZATION IN
CROATIAN FORESTRY
- Authors:
- Sever, Stanislav (43066)
Journal: Mehanizacija šumarstva
Number: 1
ISSN: 0352-5406
Volume: 18
Year: 1993
Pages: from 3 to 15
Number of references: 19
Language: hrvatski
Summary: At the beginning of the last decade of the century
andmillennium, Croatian forestry has found itself in entirelydifferent
circumstances. With the new relations Croatian peopleare experiencing, the
forestry has started a new life in the partof social forests as a
public/state enterprise, arriving in asituation in has been before. This
study is an attempt toanticipate through one part of forestry - its
mechanization -what the new circumstances will be like; the felling of the
treespurpose of blocking the roads had initiated the crisis whichopened the
new ones.
Keywords: forestry, mechanization, machines and equipment, strategy
- Type of paper
: Paper in journal
Title: SOME MESSAGES FROM "ELMIA WOOD 93"
- Authors:
- Sever, Stanislav (43066)
Journal: Mehanizacija šumarstva
Number: 2
ISSN: 0352-5406
Volume: 18
Year: 1993
Pages: from 45 to 46
Language: hrvatski
- Type of paper
: Paper in journal
Title: FORESTRY ENGINEERING
- Authors:
- Sever, Stanislav (43066)
Journal: Mehanizacija šumarstva
Number: 3
ISSN: 0352-5406
Volume: 18
Year: 1993
Pages: from 105 to 106
Language: hrvatski
- Type of paper
: Paper in journal
Title: ON THE BEGINNING OF 18th VOLUME "MEHANIZACIJE ŠUMARSTVA"
- Authors:
- Sever, Stanislav (43066)
Journal: Mehanizacija šumarstva
Number: 1
ISSN: 0352-5406
Volume: 18
Year: 1993
Pages: from 1 to 2
Language: hrvatski
- Type of paper
: Paper in journal
Title: COMPARED CHARACTERISTICS OF SKIDDING TRACTORS IN THINNING
OPERATIONS
- Authors:
- Sever, Stanislav (43066)
Journal: Mehanizacija šumarstva
Number: 4
ISSN: 0352-5406
Volume: 18
Year: 1993
Pages: from 197 to 203
Number of references: 12
Language: hrvatski
Summary: Mechanized procedures continue at different levels. The
decisionon introducing new variants of work methods at different levelsof
mechanization is usually followed by an evaluation study ofwork and
transport means. At this different properties are usedto define the
characteristics in terms of work, energy,morphology, the comparison of
which will help to establish theposition of the newly suggested machines
and vehicles as to theones in earlier work variants. Such investigation is
especiallyimportant for the work means used in skidding in stand thinnings.
Keywords: skidding tractors, stand thinning
- Type of paper
: Paper in journal
Title: EMERGING FOREST HARVESTING ISSUES IN EASTERN EUROPE
- Authors:
- Sever, Stanislav (43066)
Journal: Mehanizacija šumarstva
Number: 4
ISSN: 0352-5406
Volume: 18
Year: 1993
Pages: from 197 to 203
Language: hrvatski
Summary: The current situation in eastern Europe (E. E.) is
characterizedby dusk of the so-called socialism in communism.
Politicalsituation after WW II, 1945: USSR with Poland, East Germany,Czecho
(Bohemia)-Slovakia, Hungary, Romania, Bulgaria, Albaniaand Yugoslavia -
they all started the new system. In view offorestry E. E. (European part
of Soviet Union and 8 countries)are not quite comparable with the other
part of USSR (Ural,Siberia and Far East).
- Type of paper
: Paper in journal
Title: LOGOTYPE "MEHANIZACIJE ŠUMARSTVA"
- Authors:
- Sever, Stanislav (43066)
Journal: Mehanizacija šumarstva
Number: 4
ISSN: 0352-5406
Volume: 18
Year: 1993
Pages: from 177 to 178
Language: hrvatski
- Type of paper
: Paper in journal
Title: Evaluation of physical exertion of workers at log skidding
- Authors:
- Martinić, Ivan (136986)
Journal: Mehanizacija šumarstva
Number: 3
ISSN: 0354-5406
Volume: 19
Year: 1994
Pages: from 151 to 160
Number of references: 22
Language: hrvatski
Summary: The paper presents a report on the research in the
physical exertion of the following log skidding workers: tractor driver,
winch operator, choker. The research was carried out by way of laboratory
and field measurement. The field work survey lasted several days and
encompased work study and heart rate measurements every minute by means of
"Respironics", an electronic heart rate meter. The results of the research
refer to the achieved work effect, the work time structure, and the
evaluation of physical exertion of the workers based on the average heart
rate in the course of daily and the corresponding, indirectly calculated
energy consumption.
Keywords: log skidding, physical exertion, heart rate, energy consumption
- Type of paper
: Paper in journal
Title: A Contribution to Research of Nouise Exposure of Workers
at Log Skidding
- Authors:
- Martinić, Ivan (136986)
Journal: Mehanizacija šumarstva
Number: 1
ISSN: 0352-5406
Volume: 20
Year: 1995
Pages: from 11 to 16
Number of references: 19
Language: hrvatski
Summary: The paper is a report on the noise exposure of
self-standing whinch operators and chokers during tractor skidding. A
many-days-survey of field work encompased a work study and noise
measurement. The research results refer to the average daily level of noise
and the corresponding structure of work time.
Keywords: log skidding, noise exposure, work study
- Type of paper
: Paper in journal
Title: EVALUATION OF PHYSICAL EXERTION BY STATISTICAL ANALYSIS OF
WORKER'S HEART RATES AT LOG SKIDDING
- Authors:
- Martinić, Ivan (136986)
Journal: Arhiv za higijenu rada i toksigologiju
Volume: 46
Year: 1995
Pages: from 23 to 32
Number of references: 14
Language: engleski
Summary: Results of investigation into physical exertion of the log
skidding workers: tractor driver, winch operator and choker are presented.
According to the average rateduring daily work, the physical exertion of
the tractor driver and winch operator was classified as low exertion (75-95
min-1), whereas that of the choker was established as medium exertion
(96-115 min-1). Energy consumption was calculated for the daily working
time of 262 minutes, according to field measurements and for normal
eight-hour-work. According to field measurement values the tractor drivers'
and winch operators' work was categorized as light work (1.23-2.51 MJ) and
that of the choker as heavy work (2.52-6.30 MJ).
Keywords: energy consumption, ergonomics, field measurements, forestry, heavy work operators, work study
- Type of paper
: Paper in journal
Title: Penetrometer-measuring device for estimation of forest
soil compaction
- Authors:
- Horvat, Dubravko (16384)
Journal: Mehanizacija šumarstva
Number: 3
ISSN: 0352-5406
Volume: 19
Year: 1994
Pages: from 16117 to 1
Number of references: 40
Language: hrvatski
Summary: This paper deals with the penetration characteristics of 4
types of soils and also the changes of penetration resistance after
multiple pass of one vehicle. The analysis is carried out with exponential
regression model. The first results showed that this type of analyze offers
possibility for a good quantitative description of influence of vehicle
passes on penetration resistance and soil compaction.
Keywords: penetrometer, soil compaction, multipass effect, exponential regression model
- Type of paper
: Paper in journal
Title: New competition of Croatian forest workers in Kinkov
- Authors:
- Vondra, Vencl (70055)
Journal: Mehanizacija šumarstva
Number: 3
ISSN: 0352-5406
Volume: 19
Year: 1994
Pages: from 205 to 212
Number of references: 8
Language: hrvatski
Summary: After compulsory three-year-interval following the
interruption in 1991, the 27-year-old competition of forest workers took
place in September 1994 in Kinkov. The article contains (1) a review of
past competitions in Croatia; (2) an analysis of the Statute of the
Comppetitions; (3) definition of the competitors' features; (4) suggestions
for possible improvements; (5) an analysis of the results of the Kinkov
competition. The issues confirm the author's assumption of a close
connection of both individual and team results with the highly developed
process of workers' training daily tasks.
Keywords: competion of forest workers, manufacture workers and competiors, connection between the achieved results and the process of workers' training
- Type of paper
: Paper in journal
Title: A Supplement to the Use of the Medium Skidder Ecotra V as
Precented by Organizational and Economic Work Indicators
- Authors:
- Vondra, Vencl (70055)
- Bogojević, Siniša
Journal: Mehanizacija šumarstva
Number: 4
ISSN: 0352-5406
Volume: 19
Year: 1994
Pages: from 247 to 258
Number of references: 13
Language: hrvatski
Summary: The research was aimed at the establishment of production
indicators of the use of the medium skidder Ecotrac V. The results
encompassed: (1) the analysis of the environment and stand conditions; (2)
the indicators of the to date work of the Ecotrac V-012, (3) the analysis
of the work time, (4) the assessment of physical exertion of the workers,
(5) the work effects and standards as realized and formed according to the
research studies; (6) stand losses due to work operations; (7) computations
and analyses of the expenses needed for timber supplied to off-road
storages. The indicators determined through the research show, both
physically and economically, that in all logging phases is the
productiveness too low, the growth potentials being considerable.
Keywords: work research, work standards, workers' exertion, tree damage, daily work productiveness, costs of timber transportation to off-road storages
- Type of paper
: Paper in journal
Title: A Contribution to the Feature Analysis of Wood Handling on
the Log Storage-the Contact Place of Forestry and Woodworking Industry
Transport Courses
- Authors:
- Beljo, Ružica (179874)
Journal: Mehanizacija šumarstva
Number: 1
ISSN: 0352-5406
Volume: 19
Year: 1994
Pages: from 45 to 54
Number of references: 23
Language: hrvatski
Summary: Log storage is the contact place of forestry and
woodworking industry transport courses. Storage log transport, as a
connection between log hauling and processing, has with its efficacity a
great influence on the continuity and efficiency of the woodprocessing from
the stump to the final wood products. Knowing the exploitational features,
especially the transport means productivity in the specific working
conditions, is an important factor for the choice of transport means. This
article analyzes the features of the most frequently used transport means
for wood handling on the central mechanized storages - gantry cranes and
loaders.
Keywords: log storage, wood handling, gantry crane, loader
- Type of paper
: Paper in journal
Title: Application of Hamm's approximate method of electric power
determination for transport means research
- Authors:
- Beljo, Ružica (179874)
- Malek, Jaromir
Journal: Drvna industrija
Number: 2
ISSN: 0012-6772
Volume: 46
Year: 1995
Pages: from 75 to 79
Number of references: 12
Language: hrvatski
Summary: This paper presents Hamm's approximate method for
determination the consumed electric energy of three-phase asynchronous
induction electricmotors. The method gives brief and enough exact
information for making decision of advisable technical factors in working
conditions. The base of this approximate method is dependence of power
factor cos šSYMBOL 106 Đf "Symbol"ć upon electricmotor load. Hamm has done
for three characteristic values of power factor (cos šSYMBOL 106 Đf
"Symbol"ć = 0,7; cos šSYMBOL 106 Đf "Symbol"ć = 0,8; cos šSYMBOL 106 Đf
"Symbol"ć = 0,9) the diagram, based on empiric data, for determination of
electric power on the base of measured current. Results of research have
confirmed that mechanical conveyor is more power favourable than pneumatic
conveyor.
Keywords: consumed electric energy, pneumatic and mechanical conveyor
- Type of paper
: Paper in journal
Title: Utilization of the Forest Wood Residuals for Wood Chip
Production for Heat Generators
- Authors:
- Hamm, Đuro
- Goglia, Vlado
- Sever, Stanislav (43066)
Journal: Mehanizacija šumarstva
Number: 4
ISSN: 0352-5406
Volume: 19
Year: 1994
Pages: from 269 to 275
Number of references: 12
Language: hrvatski
Summary: Compared to other fuels, petrol and petroleum products
offer quite a number of advantages. It is particuraly obvious in the
production of heat energy, so that now days of the steam power plants have
completely switched to those fuels, although sometimes for no objective
reason. Problems with prices and supply have now forced many petrol fueled
steam power plants to reconsider the return to the original fuels. However,
this time the preparations have to be taken much more seriously.
Keywords: wood residuals, chip production, heat generators
- Type of paper
: Paper in journal
Title: Improving of wood chips by predrying
- Authors:
- Goglia, Vlado
- Hamm, Đuro
- Sever, Stanislav (43066)
Journal: Mehanizacija šumarstva
Number: 1
ISSN: 0352-5406
Volume: 20
Year: 1995
Pages: from 27 to 31
Number of references: 9
Language: hrvatski
Summary: The paper discusses the influence of the moisture content
on the wood chips heating characteristics and the possibilities of
improving its quality by predrying the wood chips in a container. The
predrying may be done using the heat energy obtained by wood burning or by
solar energy.
Keywords: wood chips, heating value, predrying, solar energy
- Type of paper
: Paper in journal
Title: Some problems in forest biomass harnessing
- Authors:
- Goglia, Vlado
- Sever, Stanislav (43066)
Journal: Mehanizacija šumarstva
Number: 3
ISSN: 0352-5406
Volume: 19
Year: 1994
Pages: from 193 to 199
Number of references: 11
Language: hrvatski
Summary: The paper discusses the possibilities of using wood
rests/waists for energetic purposes. An estimation of rest/waist wood
quantities and an analysis of wood characteristics compared to other fuels
is made.
Keywords: biomass, wood rests, wood waists, energy
- Type of paper
: Paper in journal
Title: Testing of some chain saws'exploitation characteristics
- Authors:
- Goglia, Vlado
- Horvat, Dubravko (16384)
- Puljak, Stjepan
Journal: Mehanizacija šumarstva
Number: 4
ISSN: 0352-5406
Volume: 18
Year: 1993
Pages: from 205 to 208
Number of references: 12
Language: hrvatski
Summary: The monitoring of the chain saws' exploitation
characteristics can essentially contribute to the optimization of their
life time and also diminish the total cocst of forest utilization. At the
same time, the monitoring of both, the noise and vibrations levels and the
chain breaking time, increases the operator's safety considerably.
Therefore complex research work was on and several chain saw types of the
two most frequently used products in the Republic of Croatia. The condition
was that they were all used in forest utilization under the fairly same
conditions over the period of 1 to 4 years. At the same time, measurements
were carried out on the brand new chain saws, too.
Keywords: chain saws, exploitation characteristics, noise, vibrations, chain breaking time, engine power, fuel consumption
- Type of paper
: Paper in journal
Title: Rational production and use of energy whith special
reference to biomass
- Authors:
- Risović, Stjepan
- Sever, Stanislav (43066)
Journal: Mehanizacija šumarstva
Number: 1
ISSN: 0352-5406
Volume: 20
Year: 1995
Pages: from 17 to 21
Number of references: 29
Language: hrvatski
Summary: Wit conservation as the major target, the possibilities of
better utilization of the renewable energy sources are discussed in this
paper. For the time from 1990 until 2020 two percent yearly rate of
worldwide primary energy demand is estimated. The significance of the
forest biomass as fuel in many countries is closely associated with general
understanding of one's own energy situation. To present an energy estimate
from forest biomass, there is a review of species and assortments processde
in the wood-technological industries in Croatia.
Keywords: forest biomass, wood residue, energy
- Type of paper
: Paper in journal
Title: What next whith means in forestry
- Authors:
- Sever, Stanislav (43066)
Journal: Glasnik za šumske pokuse
ISSN: 0352-3861
Volume: 29
Year: 1993
Pages: from 249 to 264
Number of references: 25
Language: hrvatski
Summary: Any transfer or alteration within the range of forestry may
cause a number of questions as to its system. The questions concerned with
possible transfer are usually asked within the so-called associated
activities: constructors of various parts of forest infrastructure;
machanization, etc. Besides the issues of ownership and the current
transfer, there are many questions related to other things, such as:
machines and devices allowed to be applied in forests; techical
laboratories and calibration laboratories accredited for issung
certificates of validity for technical devices used in forestry; parts of
equipment to be produced in the country, others imported or obtained
through licenses or other way of collaboration; the ways of directing the
dependencies between adaptability and versatility of the equipment, etc.
Keywords: forest machines and devices, question of ownership, machine choice, certification of contractor work
- Type of paper
: Paper in journal
Title: Croatian engineering society, part first, contribution to
celebration of 115. anniversary 1878-1993
- Authors:
- Sever, Stanislav (43066)
Journal: Mehanizacija šumarstva
Number: 1
ISSN: 0352-5406
Volume: 19
Year: 1994
Pages: from 78 to 80
Language: hrvatski
- Type of paper
: Paper in journal
Title: Ahead of anniversary year of "Mehanizacija šumarstva"
- Authors:
- Sever, Stanislav (43066)
Journal: Mehanizacija šumarstva
Number: 2
ISSN: 0352-5406
Volume: 19
Year: 1994
Pages: from 85 to 86
Language: hrvatski
- Type of paper
: Paper in journal
Title: Confused user of croatian linguistic support-editorial
- Authors:
- Sever, Stanislav (43066)
Journal: Mehanizacija šumarstva
Number: 4
ISSN: 0352-5406
Volume: 19
Year: 1994
Pages: from 229 to 232
Number of references: 13
- Type of paper
: Paper in journal
Title: Worker and/or participant
- Authors:
- Sever, Stanislav (43066)
Journal: Mehanizacija šumarstva
Number: 4
ISSN: 0352-5406
Volume: 19
Year: 1994
Pages: from 268 to 268
Language: hrvatski
- Type of paper
: Paper in journal
Title: Green and orange-coloured book
- Authors:
- Sever, Stanislav (43066)
Journal: Mjeriteljski vjesnik
Number: 1
Volume: 13
Year: 1995
Pages: from 2391 to 2394
Language: hrvatski
- Type of paper
: Paper in journal
Title: Revision of measurement units law
- Authors:
- Sever, Stanislav (43066)
Journal: Mjeriteljski vjesnik
Number: 5
Volume: 12
Year: 1994
Pages: from 2301 to 2301
Language: hrvatski
- Type of paper
: Paper in journal
Title: Croatian engineering society
- Authors:
- Sever, Stanislav (43066)
Journal: Mjeriteljski vjesnik
Number: 2
Volume: 13
Year: 1995
Pages: from 2446 to 2453
Language: hrvatski
- Type of paper
: Paper in journal
Title: The first of assembly session
- Authors:
- Brezinšćak,
- Sever, Stanislav (43066)
- Brezinščak, Marijan
Journal: Mjeriteljski vjesnik
Number: 2
Volume: 13
Year: 1995
Pages: from 2470 to 2472
Language: hrvatski
- Type of paper
: Paper in journal
Title: Forest biomass as a primary energy carrier
- Authors:
- Sever, Stanislav (43066)
- Risović, Stjepan
Journal: EGE-Energetika-gospodarstvo-ekologija-etika
Number: 2
Volume: 3
Year: 1995
Pages: from 118 to 119
Number of references: 9
Language: hrvatski
Summary: Forest originated biomass belongs to primary energy
carriers. Production-applicable energy system differentiates also secondary
energy carriers, e. g. briquettes, woodchips, liquid and gaseous fuel,
etc., obtained from the biomass by transformation or processing. When the
biomass is of forest origin then, in a wide sense, also trees and underwood
or their unused parts like threshing waste, branches, leaves, stumps, roots
etc. are ranged in it.
Keywords: forest biomass, primary energy carrier, secondary energy carrier
- Type of paper
: Paper in journal
Title: Destruction of croatian term norma
- Authors:
- Sever, Stanislav (43066)
Journal: Polimeri
Number: 3
Volume: 16
Year: 1995
Pages: from 93 to 94
Number of references: 16
Language: hrvatski
- Type of paper
: Paper in journal
Title: Forestry working means and ergonomic requirements
- Authors:
- Sever, Stanislav (43066)
Journal: Arhiv za higijenu rada i toksigologiju
Number: 1
Volume: 46
Year: 1995
Pages: from 95 to 110
Number of references: 43
Language: hrvatski
Summary: The paper describes chief instruments of forest production
and their ergonomic requirements. The level of mechanization in the
forestry production differs from high in logging and roadbuilding to a
considerably lower one in silviculture, where nursery production stnads out
with the level of mechanization equalling that of agriculture. Ergonomic
requirements greatly depended on the attitude of a particular social
environment towards work safety. Some ergonomic requirements take the form
of standards, recommendations or agreements. The chain saw is characterized
not only by ergonomic-technical properties but also by mass, noise and
vibration. Over the past three and a half decades each of these parameters
has come to conform to stricter and stricter requirements.
Keywords: chain saw work, noise, occupational exposure, personal safety equipment, vibration, work organization, working environment
- Type of paper
: Paper in journal
Title: Prologue by anniversary 20. year
- Authors:
- Sever, Stanislav (43066)
Journal: Mehanizacija šumarstva
Number: 1
ISSN: 0352-5406
Volume: 20
Year: 1995
Pages: from 1 to 4
Language: hrvatski
- Type of paper
: Paper in proceedings
Title: MODELS FOR ANALYZING THE EFFICIENCY INDICATORS OF TIBER
TRANSPORT FOREST TRUCKS
- Authors:
- Vondra, Vencl (70055)
- Editors
- Taeutenberg-Raupach, Andrea
- Brezinšćak,
Proceedings title: Work study, Payment and Labour productivity
Language: engleski
Place: Goettingen, Germany
Year: 1992
Pages: from 220 to 230
Meeting: Work Study - Measurement and Terminology
Held: from 06/10/92 to 06/12/92
Summary: Round 4,2 million m3 of timber were transported on 408
foresttrucks in 1988. By a statistical/mathematical processing of thethe
surveyed data and an analysis of the test results, we createda model for
comparative analyses the productivity, efficiency andprice of timber
transport. The improvements are possible withsmall investments though with
a number of changes in timbertransport organization.
Keywords: truck transport of timber, work study, time study, work producibility, price of timber transport
Other: Organizator: IUFRO Working Party S3. 04-02
- Type of paper
: Paper in proceedings
Title: WORK STUDY DATABASE AS A BASIS FOR HARVEST PLANNING
SOFTWARE
- Authors:
- Martinić, Ivan (136986)
- Tomanić, Simeun
- Vondra, Vencl (70055)
- Editors
- Sessions, John
Proceedings title: Workshop on Computer Supported Planning of Roads and Harvesting
Language: engleski
Place: Feldafing, Germany
Year: 1992
Pages: from 220 to 228
Meeting: Computer Supported Planning of Roads and Harvesting Workshop
Held: from 08/26/92 to 08/28/92
Summary: The base for planning forest operations are the data on the
workprocess factors. Detailed data and study results have initiadedand
anabled the introduction of new technologies in planningforest operations
in Croatian forestry. Based on the work studyresults, two software tools
for short-term planning of fellingitems have been developed. The news
software tool, the fellingoperation manager would be given better
opportunities for dynamiccoordination of the planned in forestry
enterprises.
Keywords: felling, work study database, planning software
- Type of paper
: Paper in proceedings
Title: LINKING GIS AND HARVEST REGRESSION MODELS FOR PLANNING
- Authors:
- Vondra, Vencl (70055)
- Martinić, Ivan (136986)
- Kušan, Vladimir
- Ananić, Miroslav
- Belušić, Robert
- Editors
- Sessions, John
Proceedings title: Workshop on Computer Supported Planning of Roads and Harvesting
Language: engleski
Place: Feldafing, Germany
Year: 1992
Pages: from 165 to 173
Meeting: Computer Supported Planning of Roads and Harvesting Workshop
Held: from 08/26/92 to 08/28/92
Summary: The ARC/INFO geograpfic information model (GIS) is being
utilizedto characterize the "Opeke", educational and research forest.
Westarted to develop this system in 1990 and it is still inprogress. It
consists of cartografic layers, lists of attributesfor various features and
relational database. By linking GIS withharvest regression models (HRM) we
are trying to improve harvestplanning.
Keywords: GIS, database forest managment, harvest regression models planning
Other: Proccedings of IUFRO Conference (Subject Groups, 3.05 and
3.06)
- Type of paper
: Paper in proceedings
Title: SKIDDERS AND FORWARDERS DATABASE AS A SOURCE AND HELP IN
DETERMINING MORPHOLOGICAL RELATIONSHIPS
- Authors:
- Sever, Stanislav (43066)
- Horvat, Dubravko (16384)
- Editors
- Knutell, Hans
Proceedings title: Computer Supported Planning of Roads and Harvesting Workshop
Language: engleski
Place: Feldafing, Germany
Year: 1992
Pages: from 196 to 200
Meeting: Computer Supported Planning of Roads and Harvesting Workshop
Held: from 08/26/92 to 08/28/92
Summary: The paper discusses the criterion used to indentfy families
ofwheel-articulatedlogging tractors and the technical parametersneeded in
defining machine properties.
Data bank contains values for 86 skidders and 52 forwarders.Computer-aided
research was carried out on the form index,specific mass and unit power of
the tractor, and a series ofrelationships between the geometrical
parameters, parameters ofmass and energy parameters for these two types of
specific forestvehicles.
Keywords: skidder, forwarder, data bank of technical features, morphological analysis
Other: Workshop Sponsors: IUFRO Subject Groups 3.05 and 3.06;
Universityof Munich
- Type of paper
: Paper in proceedings
Title: LOGGING WHEELED TRACTOR DATA BANK FOR ASSISTANCE IN
MACHINE FAMILY EVALUATION
- Authors:
- Sever, Stanislav (43066)
- Horvat, Dubravko (16384)
- Editors
- Sessions, John
Proceedings title: Computer Supported Planning of Roads and Harvesting Workshop
Language: engleski
Place: Feldafing, Germany
Year: 1992
Pages: from 281 to 288
Meeting: Computer Supported Planning of Roads and Harvesting Workshop
Held: from 08/26/92 to 08/28/92
Summary: The paper deals with analysis of a logging equipment data
bankfor some geometrical parameters to estimate the form index. Aparameter
of the form index is one of several morphologocalcharacteristics of a
vehicle, helping to define the fild ofextended typical machine familly. Two
parameters are needed forgraphical destricption: the height/lenght (H/L)
ratio and thewith/lenght (B/L) ratio. The following characteristic groups
oflogging vehicles have been established after previous studies offarm
tractors, skidders and forwarders: medium skidders, miniskidders, ATVs,
vehicles with tracks over wheels and so-colledindividual logging vehicles.
Keywords: logging wheeled tractors, form index, machine family
Other: Workshop Sponzors: IUFRO Subject Groups, 3.05 and
3.06;University of Munich
- Type of paper
: Paper in proceedings
Title: UFB - UTILIZATION OF FOREST BIOMASS
- Authors:
- Horvat, Dubravko (16384)
- Jakupović, Esad
- Knežević, Ivo (21470)
- Sever, Stanislav (43066)
- Editors
- Knutell, Hans
Proceedings title: ECONOMICS OF WOOD ENERGY SUPPLY SYSTEMS
Language: engleski
Place: Garpenberg, Sweden
Year: 1991
ISBN/ISSN: 0282-2377
Pages: from 152 to 167
Meeting: BIOENERGY SUPPLY SYSTEMS
Held: from 05/20/91 to 05/24/91
Summary: The paper deals with algorithm and contents of mathematical
modelfor estimating the potentials of energy from the forest biomass.From
the main model of the program with its initial data, modulesof the
subprogram are retrieved: mean tree, stand condition,timber harvesting and
stand structure. The realized program isbased on the terms of the spruce
(Picea Abies). Available energy(e.g. MJ/ha), specific energy of the whole
stand (MJ/ha), etc.are determined by estimation.
Keywords: forest biomass, utilization, history, energy content, mathematical model
- Type of paper
: Paper in proceedings
Title: COMPUETR-AIDED DETERMINATION OF OPTIMAL FOREST ROAD
DENSITY IN MOUNTAINOUS AREAS
- Authors:
- Sever, Stanislav (43066)
- Knežević, Ivo (21470)
- Editors
- Sessions, John
Proceedings title: Computer Supported Planning of Roads and Harvesting Workshop
Language: engleski
Place: Feldafing, Germany
Year: 1992
Pages: from 13 to 25
Meeting: Computer Supported Planning of Roads and Harvesting Workshop
Held: from 08/26/92 to 08/28/92
Summary: The paper presents some results of investigating
thecomputer-aided determination of optimal forest-road density
inmountainous areas. The model and its testing were made for thecase of
uneven distribution of felling volume and for the caseunchanged density of
truck roads. The research and productionsequence was carried out in the
following way: (1) determinationof skidding gravity and section areas; (2)
gradual design ofstrip roads; (3) gradual building of strip roads over
thegravitation area.
Keywords: forest opening, skid roads, computer-aided determination of forest roads, optimal skid road density in mountainous areas
- Type of paper
: Paper in proceedings
Title: CRITERIA FOR CLASSIFYING OFF-ROAD VEHICLES
- Authors:
- Sever, Stanislav (43066)
- Editors
- Nilsson, Per Olov
Proceedings title: POST-CONGRESS PROCEEDINGS IUFRO Division 3 XIX WORLD CONGRESS
Language: engleski
Place: Garpenberg, Sweden
Year: 1991
ISBN/ISSN: 0282-2377
Pages: from 230 to 241
Meeting: IUFRO World Congress 1990 "Forest Operations and Techniques"
Held: from 08/05/90 to 08/11/90
Summary: This paper discusses the criteria serving for clasifying
off-roadlogging vehicles which are as a rule the technical features ofthe
wheeled or semitracks tractors. Among others, the criteriacan help in a
complex decision which should be approached in arational manner in
obtaining the best unit for certain loggingoperations. The paper shows the
influence of the most importantof these features, namely, size, tractive
effort, groundpressure, grapple loaders implements, etc., as possible
criteriafor classifying off-road vehicles.
Keywords: logging vehicles, classification
- Type of paper
: Paper in proceedings
Title: EMERGING FOREST HARVESTING ISSUES IN EASTERN EUROPE
- Authors:
- Sever, Stanislav (43066)
- Editors
- Nilsson, Per Olov
Proceedings title: POST-CONGRESS PROCEEDINGS IUFRO Division 3 XIX WORL CONGRESS
Language: engleski
Place: Garpenberg, Sweden
Year: 1991
ISBN/ISSN: 0282-2377
Pages: from 242 to 245
Meeting: IUFRO World Congress 1990 "Forest Operations and Techniques"
Held: from 08/05/90 to 08/11/90
Summary: Dusk of the so-called socialism and communism;
politicalsituation after WW II, 1945: USSR + Poland, East Germany,
Czecho(Bohemia)-Slovakia, Hungary, Roumania, Bulgaria, Albania
andYugoslavia - they all tarted the new system. In view of forestry:E.E. =
Europen part of Soviet Union + 8 countries (Ural, Siberiaand Far East) are
not quite comparable.
- Type of paper
: Paper in proceedings
Title: FORM INDEX AS POSSIBLE CRITERION FOR CLASSIFICATION OF
FOREST OFF-ROADVEHICLES
- Authors:
- Sever, Stanislav (43066)
- Knežević, Ivo (21470)
Proceedings title: 5th European Conference International Society for Terrain-Vehicle Systems
Language: engleski
Place: Budapest, Hungary
Year: 1991
Pages: from 468 to 476
Meeting: 5th European Conference International Society for Terrain-Vehicle Systems
Held: from 09/04/91 to 09/06/91
Summary: The paper discusses the criterion used for classifying
off-roadlogging vehicles, assuming that the tractor is a prism with
sidespassing through the end points of the vehicles. Two parametersare
needed for its graphical description: the heigh/length (H/L)ratio and the
width/length ratio. Adapted farm tractors,skidders, forwarders,
medium-skidders, mini-skidders, ATVsvehicles (all terrain vehicles),
vehicles with tracks over wheelsand the individual logging vehicles have
all been studied. Thecriteria can help in a complex decision which should
beapproached in a rational manner, to obtain the best machines
forparticular logging operations.
Keywords: logging tractors, morphological analysis, form index
- Type of paper
: Paper in proceedings
Title: RESULTS OF EXPERIENCE CONCERNING THE POSSIBLE HEAT
PRODUCTION FROM BIOMASS IN CROATIA
- Authors:
- Sever, Stanislav (43066)
Proceedings title: DISTRICT HEATING WITH BIOMASS
Language: engleski
Place: Graz, Austria
Year: 1993
Pages: from 27 to 30
Meeting: District Heating with Biomass
Held: from 04/01/93 to 04/02/93
- Type of paper
: Paper in proceedings
Title: n exponential correlation model for penetration
characteristics of soil and wheel slip curve
- Authors:
- Horvat, Dubravko (16384)
- Editors
- Schrenke, Karl-Theodor
Proceedings title: Soil, tree, machines interaction
Language: engleski
Place: Feldafing, Germany
Year: 1994
Pages: from 1 to 7
Meeting: Interacctive seminar and workshop
Summary: This paper deals with the penetration characteristics of 4
types of soil and also the changes of the penetration resistance after the
multiple pass of the forwarder. The analysis where carried out with
exponential regression model. The first results showed that this type of
analyze offers possibility for a good quantitative description of both, the
type and the condition of soil, as well as the influence of the number of
vehicle passes.
- Type of paper
: Paper in proceedings
Title: Steyr 8090 & Seppi M. Miniforst assemblay in silvicultural
work
- Authors:
- Horvat, Dubravko (16384)
- Sever, Stanislav (43066)
- Jelčić, Krunoslav
Proceedings title: Proceedings of 6th European ISTVS Conference
Language: engleski
Place: Beč, Austrija
Year: 1994
Pages: from 887 to 895
Meeting: 6th European ISTVS Conference
Summary: The pedunculate oak forests are the most valuable stands in
Croatia. For this reason special attention is given to their natural
regeneration and silviculture. The paper deals with the application of a
special assembly on one segment of silvicultural work. Two main components
of the assembly are Seppi M. Miniforst mulching flail mover as a working
machine, and prime mover Steyr 8090 tractor as the power engine.
Keywords: silvicultural pass and trail, mechanized of silvicultural works, mulching flail mower, prime mover
- Type of paper
: Paper in proceedings
Title: A contribution to damage assessment standardization
resulting from the research into machine use on variable slopes
- Authors:
- Horvat, Dubravko (16384)
- Sever, Stanislav (43066)
- Tomašić, Željko
- Editors
- Schrenke, Karl-Theodor
Proceedings title: Soil, tree, machines interaction
Language: engleski
Place: Feldafing, Germany
Year: 1994
Pages: from 1 to 9
Meeting: Interacctive seminar and workshop
Summary: Intended to advance the selection methods of the suitable
equipment and tehnical outfit, research was carried out on the use of
tractor in wood-skidding with one end up over the so-called standard
skidding track. It has been built in the forestry department in several
segments of variable slopes: 0 %, 20 %, 30 % and 40 %, each 30 m long. The
test was normed according to the load, by determining soil properties (CI,
moisture, soil contents), and by measuring the energy values.
- Type of paper
: Paper in proceedings
Title: Some changes in Forestry Technologies, Techniques and
Operational Research in Croatia, a Country in Transition
- Authors:
- Sever, Stanislav (43066)
Proceedings title: Proceedings Scandinavian Forest Research in Europe: Operational Research
Language: engleski
Place: Lyngby, Danska
Year: 1994
Pages: from 69 to 81
Meeting: NSR Research Conference 1994. Ministry of Agriculture
Held: from 08/31/94 to 09/04/94
Summary: Since 1990 when it began, the transition of the East
European countries has in many ways influenced their political, economic,
and social lives, bringing radical changes into many parts of life. It has
variously affected different branches of economy, usually forestry too,
with the accompanying operational research supporting and following every
kind of transition. So, a branch of economy providing wood for many uses
and ensuring sustained forest management with all associated environmental
functions, forestry has likewise been submitted to the imminent changes.
Keywords: forestry in Croatia, ownership transition, operational research, technology and technique
- Type of paper
: Summary in proceedings
Title: Mulching Flail Mower-One Method for Mechanization of Stand
Establishment and Treatment Operations
- Authors:
- Horvat, Dubravko (16384)
- Sever, Stanislav (43066)
- Editors
- Korpilahti, Eva
- Salonen, Tomm
- Oja, Seppo
Proceedings title: Caring for the Forest: Researsh in a Changing World
Language: engleski
Place: Tampere, Finska
Year: 1995
ISBN/ISSN: 951-40-1452-9
Pages: from 111 to 111
Meeting: IUFRO XX World Congres
Held: from 08/06/95 to 08/12/95
Summary: The choice of the mulching flail mower Seppi m. Miniforst
and the prime mover Steyr 8090, a tractor adapted to the work in
silvicultural operations - by the built-in crawling speed, double steerage
(forward and backward), rpm of power take-off - has resulted in an
aggregate whose possibilities of used had yet to be defined.
Keywords: silvicultural pass and trail, mechanized silvicultural work, mulching flail mower, prime mover.
- Type of paper
: Summary in proceedings
Title: Past and Future of Forest Biomass Utilization in Croatia
- Authors:
- Goglia, Vlado
- Horvat, Dubravko (16384)
- Risović, Stjepan
- Sever, Stanislav (43066)
- Editors
- Korpilahti, Eva
- Salonen, Tomm
- Oja, Seppo
Proceedings title: Caring for the Forest: Research in a Changing World
Language: engleski
Place: Tampere, Finska
Year: 1955
ISBN/ISSN: 951-40-1452-9
Pages: from 124 to 124
Meeting: IUFRO XX World Congres
Held: from 08/06/95 to 08/12/95
Summary: The Croatian forest products most commonly produced are
commercial wood in the form of timber and logs for sawmills and other wood
industries and industrial wood for chip board, etc. as well as fuelwood
including a little percent of chips for energy purposes. Potential raw
material sources for fuel wood are bark, by-products and wood residues from
the forest industry; raw material directly from forest operations and other
types of raw material originating from wood. The history of forest chip
production in Croatia is a good illustration of the conflicting issues of
timber, energy and economy. After ten years of trying to organize
production of secondary energy, we have now entered a new decade in which
the nature of energy is being redefined.
Keywords: forest biomass, utilization in the past, future plants in Croatia
- Type of paper
: Ph.D.
Title: A Contribution to Investigation of Vehicle Mobility on
Forest Soil
Faculty: Fakultet strojarstva i brodogradnje Sveučilište u Zagrebu
Author: HORVAT DUBRAVKO
Date of defense: 09/23/93
Language: hrvatski
Number of pages: 234
Summary: This study deals with investigation results of some general
andtractive characteristics of a special forest
vehicle - forwarder and with some effects of its movement onforest soil as
compaction and rut
formation. Regressional analyses with the exponential correlationmodel,
made by original computer
program, was used for describing important relationships. So itwas
possible to establish the correlation
between vehicle tractive efforts, soil characteristics and soildisturbance.
Keywords: forwarder, forest soil, tractive characteristics, soil compaction, rut fotmation, soil characteristics, tensiometric method, regressional anlyze, exponential correlation model
- Type of paper
: Ph.D.
Title: INVESTIGATION AND APPLICATION OF MATHEMATICAL MODELS FOR
PLANNING AND CONTROL THE WORK PROCESS IN FORESTRY
Faculty: ŠUMARSKI FAKULTET ZAGREB
Author: VONDRA VENCL
Date of defense: 10/09/91
Language: hrvatski
Number of pages: 334
Summary: The results are based on the data obtained for
approximately 60000 felled and converted trees. The surveyed work amounted
toapproximately 43 000 working hours. The results are consist of:Analytical
Data Processing and Critical Evaluation of Results;Work Duration for
Cutting and Wood Conversion; Volume andStructure of Wood Assortments;
Consumption of Fuel andLubricants; Power time of saw; Application Methods
and softwarefor Practical Application of Results.
Keywords: objective planning, volume and structure of wood assortiments, fuel and lubricants, power time of saw, units of work efficiency, software packages
- Type of paper
: M.A.
Title: SOME TECHNOLOGICAL FEATURES OF TRANSPORT MEANS ON THE LOG
AND LUMBER STORAGE
Faculty: ŠUMARSKI FAKULTET ZAGREB
Date of defense: 07/28/93
Language: hrvatski
Number of pages: 107
Summary: With the analysis of transport solutions on the logs
storage andstorage of lumber of the Lučice sawmill, the aim was to
establishsome technological and technical features as well as
economicalresults of the most frequently used transport equipment for
logand lumber handling. The transport means output is
considerablyinfluenced by the medium distance of transport, the features
oflogs and lumber, work organisation and way the equipment ishandled. The
expense per working hour of a transport meansdepends upon the utilisation
of its capacity, so that for fewerworking hours the transport equipment
with lower fixed expensesare economically more justified.
Keywords: handling material, logs storage, storage of lumber, transport means (equipment), technical and technological features, exploitational features, transport means output, working hour costs, economical justifiability
- Type of paper
: M.A.
Title: EFFICIENCY OF WOOD TRANSPORTATION BY THE TRAIL TRUCKS
Faculty: ŠUMARSKI FAKULTET ZAGREB
Author: VONDRA VENCL
Date of defense: 04/09/91
Language: hrvatski
Number of pages: 110
Summary: The paper deals with the significance of truck
transportation oftimber in Croatian forestry. The aim of work was to
establish thelaws of the main factors as influencing timber
transportation,and the ways of its improvement. In dealing with the
task,methods of analysis and synthesis were used. Time sequences ofthe
indices were analyzed and tested. The research proves thatwithout
additional investments the timber transportationproducibility can be
increased by about 10 %.
Keywords: timber transportation, truck, roads, work time, loading, unloading, drive, driving speed, normatives, work producibility factors, transportation costs, driver's exertion.
- Type of paper
: Computer program
Title: UFB
- Authors:
- Horvat, Dubravko (16384)
Odering party: Šumarski fakultet
Institution depot: Šumarski fakultet
HW platform: PC IBM
Operating system: DOS
Programming language: Quick Basic 4.0
Year: 1991
Summary: Purpose of this program is to estimate a energy content
offorest biomass from forest stand.
Keywords: forest stand, forest work, biomass, energy content