Drvna Industrija最新文献_第9页

Effect of Acetylation and Accelerated Weathering of Nigerian Grown Rubberwood (Hevea brasiliensis, Müll. Arg.) on Equilibrium Moisture Content and Colour Change 尼日利亚橡胶木乙酰化和加速风化的影响论平衡水分含量和颜色变化

IF 1.1 4区农林科学

Drvna Industrija Pub Date : 2022-03-19 DOI: 10.5552/drvind.2022.2113

S. Olaniran

{"title":"Effect of Acetylation and Accelerated Weathering of Nigerian Grown Rubberwood (Hevea brasiliensis, Müll. Arg.) on Equilibrium Moisture Content and Colour Change","authors":"S. Olaniran","doi":"10.5552/drvind.2022.2113","DOIUrl":"https://doi.org/10.5552/drvind.2022.2113","url":null,"abstract":"This study was conducted to investigate the effect of acetylation on equilibrium moisture content (EMC) of Nigerian-grown rubberwood and its effect on colour change in exposure of rubberwood to surface degradation through accelerated weathering. The samples were modified to two levels of acetylation, which yielded weight percent gain (WPG) of 7 % and 10 % after 8hr (8-hr Acetyl) and 48hr of acetylation (48-hr Acetyl), respectively. Accelerated weathering of unmodified (Ref) and acetylated wood was done using QUV-Accelerated Weathering Tester for four weeks. The unmodified and acetylated samples (weathered and unweathered) were oven-dried and conditioned in climate rooms at different relative humidity of 50 %, 65 % and 95 %, with samples being moved to each room after 14 days. Results showed that acetylation led to a significant decrease in equilibrium moisture content of rubberwood. After weathering, there was a decrease in EMC of rubberwood due to removal of hemicelluloses alongside the degraded lignin, and a slight increase in EMC of the acetylated wood. In terms of colour change, photo-bleaching of the acetylated samples was higher (10.46 for 48-hr Acetyl) after four weeks of weathering compared to the unmodified samples (6.43). Hence, the outcome of this study has shown that, although acetylation is effective in minimizing moisture ingress into wood, it resulted in photo-bleaching of the weathered samples. Additional surface coating is recommended to serve as a protective layer, preventing partial washing out of the acetyl groups, minimize photo-bleaching during weathering and prolong the aesthetic value of the wood especially in outdoor applications such as wall cladding and façade.","PeriodicalId":11427,"journal":{"name":"Drvna Industrija","volume":" ","pages":""},"PeriodicalIF":1.1,"publicationDate":"2022-03-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"42988810","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Biomass Pelletizing Process 生物质制粒过程

IF 1.1 4区农林科学

Drvna Industrija Pub Date : 2022-03-19 DOI: 10.5552/drvind.2022.2139

Marin Dujmović, B. Šafran, Matija Jug, Kristijan Radmanović, A. Antonović

引用次数: 3

Diagonal Tension Performance of Impregnated Woodworking Corner Joints 浸渍木工角接头的对角拉伸性能

IF 1.1 4区农林科学

Drvna Industrija Pub Date : 2022-03-19 DOI: 10.5552/drvind.2022.2038

Ş. Doruk

引用次数: 0

Reinforcement of Joints Between LVL Members with GFRP and Finite Element Analysis GFRP加固LVL构件节点及有限元分析

IF 1.1 4区农林科学

Drvna Industrija Pub Date : 2022-03-19 DOI: 10.5552/drvind.2022.2049

M. Dalvand, G. Ebrahimi, K. Pourtahmasi

{"title":"Reinforcement of Joints Between LVL Members with GFRP and Finite Element Analysis","authors":"M. Dalvand, G. Ebrahimi, K. Pourtahmasi","doi":"10.5552/drvind.2022.2049","DOIUrl":"https://doi.org/10.5552/drvind.2022.2049","url":null,"abstract":"The goal of this study was to investigate the effect of glass fiber reinforced polymer (GFRP) on joints made of laminated veneer lumber (LVL), through experimental data and evaluation by ANSYS finite element (FE) software. In order to fabricate LVL, veneer from poplar (Populus deltoides Bartr. ex Marsh) with 2.5 mm thickness and PVA adhesive were used. T-shape joints out of LVL were made and two wooden dowels were incorporated as well. Then GFRP was applied to reinforce the joints. GFRP in three grammages (100, 200 and 300 g/ m2) was adhered to joints with epoxy resin. Joints reinforcement was performed by a two-layer reinforcing agent. For comparing the effectiveness, half of the specimens were reinforced on sides and the other half on edges. Specimens were tested in static bending. The results have shown that GFRP had a significant effect on the strength of joints. Reinforced joints on both sides were stronger than those reinforced on edge. Joints reinforced with 300 g/m2 GFRP were improved by 35 % and 43 %, respectively, compared to 100 and 200 g/m2 grammage. Failure modes of specimens are dependent on GFRP grammage. The results of FE have shown that the highest concentration of stress and elastic strain was generated in the tension and compression zones of joints.","PeriodicalId":11427,"journal":{"name":"Drvna Industrija","volume":" ","pages":""},"PeriodicalIF":1.1,"publicationDate":"2022-03-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"43938582","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 2

Behavioural Aspects of Financial Decision-Making Process of Managers in Wood-Processing Enterprises 木材加工企业经营者财务决策过程中的行为因素

IF 1.1 4区农林科学

Drvna Industrija Pub Date : 2021-11-24 DOI: 10.5552/drvind.2021.2047

M. Sedliačiková, Martina Kánová, J. Drabek

{"title":"Behavioural Aspects of Financial Decision-Making Process of Managers in Wood-Processing Enterprises","authors":"M. Sedliačiková, Martina Kánová, J. Drabek","doi":"10.5552/drvind.2021.2047","DOIUrl":"https://doi.org/10.5552/drvind.2021.2047","url":null,"abstract":"The study is focused on behavioural aspects in the financial decision-making process of wood-processing enterprises. The main aim was to map this topic and determine the key behavioural factors that lead management to make mistakes. Primary data on this issue were obtained from an empirical survey. The empirical survey was conducted through a questionnaire that contains questions focused on behavioural decision-making aspects. Using statistical methods, three key behavioural factors were determined. By selecting the given behavioural factors, it was established that love, hate, and sadness are the key factors that influence management behaviour and decision-making. In the real business environment, two managers working in a wood processing enterprise were chosen; they were willing to provide us with a review and opinion on the results of the survey. By analysing all the data, it has been concluded that, even though managers are trying to direct their behaviour and activities, they often do not notice the influence of these factors, and sometimes they are unable to make decisions. The managers should be able to direct their behaviour and activities, to provide self-control and take into consideration the fact that these factors are always present. Results determine the key and systematically occurring errors in the financial decision-making process, caused by the influence of the human factor. We have developed a model for activating the three key behavioural factors applied in the financial decision-making process as a tool that can help company managers not to make the wrong decisions.","PeriodicalId":11427,"journal":{"name":"Drvna Industrija","volume":" ","pages":""},"PeriodicalIF":1.1,"publicationDate":"2021-11-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44444593","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Determination of Ideal Cooking Conditions for Pulp Production from Avocado Wood (Persea americana Mill.) by Kraft Method 牛油果木(Persea americana Mill.)制浆理想蒸煮条件的测定

IF 1.1 4区农林科学

Drvna Industrija Pub Date : 2021-11-24 DOI: 10.5552/drvind.2021.2048

Gülşah Altunışık Bülbül, A. Gençer

引用次数: 0

The Influence of Heating Degree Days on Fuelwood Consumption in Households in Selected Countries of Central and Southeastern Europe 供热度日对欧洲中部和东南部选定国家家庭薪材消费的影响

IF 1.1 4区农林科学

Drvna Industrija Pub Date : 2021-11-24 DOI: 10.5552/drvind.2021.2111

Slavica P. Petrovic

{"title":"The Influence of Heating Degree Days on Fuelwood Consumption in Households in Selected Countries of Central and Southeastern Europe","authors":"Slavica P. Petrovic","doi":"10.5552/drvind.2021.2111","DOIUrl":"https://doi.org/10.5552/drvind.2021.2111","url":null,"abstract":"Serbia is one of the few European countries that does not keep official statistics and does not have data on heating degree days. A heating degree day (HDD) represents a measure to quantify the energy needs for heating a building. In order to create a database, six meteorological stations in Serbia had been selected, for which the heating degree days were calculated for every year in the period 2010-2018. The months with the highest values of heating degree days were also determined for each year of the analyzed period. In addition to the annual level, heating degree days in the heating seasons over the analyzed period were calculated for the six selected stations, as well as the length and the average air temperature of each heating season. In Serbia, heating season officially lasts from October 15 to April 15. To determine the influence of the calculated annual heating degree days on fuelwood consumption in households in Serbia, over the period 2010-2018, multiple econometric models were formulated. The influence of the annual values of heating degree days on fuelwood consumption for household space heating in Slovenia and Croatia was analyzed, as well. The analysis of energy consumption in the households of the selected countries showed that wood fuels are mostly used for heating, primarily fuelwood. This is the reason why this type of fuel was selected for the research.","PeriodicalId":11427,"journal":{"name":"Drvna Industrija","volume":" ","pages":""},"PeriodicalIF":1.1,"publicationDate":"2021-11-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"46845126","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Optimization of Production Parameters in Oriented Strand Board (OSB) Manufacturing by Using Taguchi Method 田口法优化定向刨花板生产参数

IF 1.1 4区农林科学

Drvna Industrija Pub Date : 2021-11-24 DOI: 10.5552/drvind.2021.2033

Ahad Furugi, F. Yapıcı

引用次数: 1

Regional Clusters, Similarities, and Changes in Turkey’s Wood Production 土耳其木材生产的区域集群、相似性和变化

IF 1.1 4区农林科学

Drvna Industrija Pub Date : 2021-11-24 DOI: 10.5552/drvind.2021.2031

R. Kurt, E. İmren

引用次数: 2

The Influence of Pulping Process and Energy Consumption on Properties of Nanofibrillated Lignocellulose (NFLC) Films Isolated from Wheat Straw 制浆工艺和能耗对麦秸纳米纤化木质纤维素膜性能的影响

IF 1.1 4区农林科学

Drvna Industrija Pub Date : 2021-11-24 DOI: 10.5552/drvind.2021.2025

B. Moezzipour, S. Hedjazi, H. Yousefi, M. Ahmadi

{"title":"The Influence of Pulping Process and Energy Consumption on Properties of Nanofibrillated Lignocellulose (NFLC) Films Isolated from Wheat Straw","authors":"B. Moezzipour, S. Hedjazi, H. Yousefi, M. Ahmadi","doi":"10.5552/drvind.2021.2025","DOIUrl":"https://doi.org/10.5552/drvind.2021.2025","url":null,"abstract":"The present research has primarily focused on the production of nanofibrillated lignocellulose (NFLC) instead of nanofibrillated cellulose (NFC), which could be produced with less energy and is expected to have similar uses as NFC, especially in the sectors where the transparency is not important. Furthermore, the effect of energy consumption needed for NFLC production and also the influence of pulping methods on the produced NFLC properties has been surveyed. Through mechanical refining and different passes in microfluidizer, the results showed the average diameter of NFLC declined from around 19000 nm to 36 nm. Soda-NFLC films had higher calliper and lower roughness, compared to those of MEA at given energy consumption in refiner and microfluidizer. For both kinds of pulps, the optimum level of energy consumption to reach the best tensile index of NFLC films was 258 kWh/t, with three passes through microfluidizer. More increase in the number of passes and pressure only resulted in increasing of energy consumption without any positive effect on improving the tensile index. The maximum tensile indices of NFLC films obtained from soda and MEA pulping processes were 113.5 and 119.86 N·m/g, respectively. The burst index of 8.5 kP·m2/g and the energy consumption of 458 kWh/t were obtained for five passes through microfluidizer. With the increase of the number of passes of soda and MEA samples through microfluidizer, the opacity decreased but transparency increased.","PeriodicalId":11427,"journal":{"name":"Drvna Industrija","volume":"978 ","pages":""},"PeriodicalIF":1.1,"publicationDate":"2021-11-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"41279415","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 2