Drewno最新文献_第3页

Cellular wood material properties – review 蜂窝木质材料性能综述

IF 0.8 4区农林科学

Drewno Pub Date : 2016-01-01 DOI: 10.12841/WOOD.1644-3985.156.14

J. Iejavs, U. Spulle

引用次数: 1

Predicting the Properties of Corrugated Base Papers Using Multiple Linear Regression and Artificial Neural Networks 基于多元线性回归和人工神经网络的瓦楞原纸性能预测

IF 0.8 4区农林科学

Drewno Pub Date : 2016-01-01 DOI: 10.12841/WOOD.1644-3985.144.13

S. Adamopoulos, A. Karageorgos, Elli Rapti, D. Birbilis

引用次数: 10

Strength enhancement of timber beams using steel plates – review and experimental tests 用钢板增强木梁的强度。审查和试验试验

IF 0.8 4区农林科学

Drewno Pub Date : 2016-01-01 DOI: 10.12841/WOOD.1644-3985.150.06

T. Nowak, J. Jasieńko, Ewa Kotwica, S. Krzosek

引用次数: 13

Laccase treatment of Norway spruce wood surface improves resistance and copper fixation of treated wood 漆酶处理挪威云杉木材表面提高了木材的抗性和铜固定

IF 0.8 4区农林科学

Drewno Pub Date : 2016-01-01 DOI: 10.12841/WOOD.1644-3985.179.10

M. Gabrič, T. Bončina, M. Humar, F. Pohleven

引用次数: 11

APPLICATION OF SELECTED AGENTS FOR WOOD LIQUEFACTION AND SOME PROPERTIES OF PARTICLEBOARDS PRODUCED WITH THE USE OF LIQUEFIED WOOD 木材液化剂的选用及液化木材生产的刨花板的一些性能

IF 0.8 4区农林科学

Drewno Pub Date : 2016-01-01 DOI: 10.12841/WOOD.1644-3985.C37.01

D. Janiszewska, I. Frąckowiak, N. Bielejewska

{"title":"APPLICATION OF SELECTED AGENTS FOR WOOD LIQUEFACTION AND SOME PROPERTIES OF PARTICLEBOARDS PRODUCED WITH THE USE OF LIQUEFIED WOOD","authors":"D. Janiszewska, I. Frąckowiak, N. Bielejewska","doi":"10.12841/WOOD.1644-3985.C37.01","DOIUrl":"https://doi.org/10.12841/WOOD.1644-3985.C37.01","url":null,"abstract":"This work presents the characteristics of wood liquefied using different types of solvents in terms of its application for binding particleboards. Standard pine particles from barked wood were used for the liquefaction experiments. The liquefaction reaction was carried out in high temperature conditions using a mixture of solvents from the polyhydroxy alcohol group, including glycerine, ethylene glycol, propylene glycol, diethylene glycol, and dipropylene glycol. The microstructure of both the liquefied wood and the liquefaction residues was determined by means of optical microscopy analysis. The basic parameters of the adhesive mixture modified with the liquefied wood, such as viscosity, pH and gel time were determined. Particleboards containing liquefied wood were produced. The following physicochemical and mechanical properties of the particleboards were measured: tensile strength, bending strength, modulus of elasticity, and formaldehyde content . The influence of the liquefying agent on the board properties was investigated. In all the tests, a control particleboard, bonded with a urea-formaldehyde adhesive resin with no inclusion of liquefied wood, was used for the purposes of comparison.","PeriodicalId":50566,"journal":{"name":"Drewno","volume":null,"pages":null},"PeriodicalIF":0.8,"publicationDate":"2016-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"66331473","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: 10

Effect of sodium ascorbate on weathering performance of NaOH pulping and paper 抗坏血酸钠对NaOH制浆造纸耐候性能的影响

IF 0.8 4区农林科学

Drewno Pub Date : 2016-01-01 DOI: 10.12841/WOOD.1644-3985.171.11

A. Gençer, S. M. Onat, A. Can, Ufuk Özgül, H. Sivrikaya, F. Yurdakurban

{"title":"Effect of sodium ascorbate on weathering performance of NaOH pulping and paper","authors":"A. Gençer, S. M. Onat, A. Can, Ufuk Özgül, H. Sivrikaya, F. Yurdakurban","doi":"10.12841/WOOD.1644-3985.171.11","DOIUrl":"https://doi.org/10.12841/WOOD.1644-3985.171.11","url":null,"abstract":"This study aimed to decelerate the weathering of paper from light by utilizing the antioxidant property of sodium ascorbate (SA), which is an ascorbic acid salt. Three different sessions of cooking were carried out by adding 2.5%, 5.0% and 7.5% of SA in proportion to the weight of a completely dried chip in addition to 24% NaOH in order to identify the influence of SA on cooking. It was observed that the pulp yield decreased when SA was added to the cooking. For that reason, it was decided to add SA into the control pulps instead of adding the digester. The same amount of SA was added to the control. The SA-added pulps were held in the agitator initially first for 2 hours and then 12 hours before making paper. So as to determine the influence of the treatment on the process. The paper was treated for 72, 144 and 256 hours and values of ∆L, ∆a, ∆b and ∆E were identified in order to determine the period of the SA’s efficacy against weathering. The total discoloration in all the samples of paper, displayed an increase with an extension of the time period. The lowest discoloration after a 256-hour time period was seen in the sample group where 7.5% of SA was added and soaked in the water. The final results indicated that the most appropriate concentration was 5% and that pulp suspension must be retained for 12 hours to improve mechanical properties.","PeriodicalId":50566,"journal":{"name":"Drewno","volume":null,"pages":null},"PeriodicalIF":0.8,"publicationDate":"2016-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"66330604","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: 7

The importance of accurate measurement of comminuted logging residues’ moisture contents for small-scale forest owners 准确测量采伐残渣水分含量对小规模林主的重要性

IF 0.8 4区农林科学

Drewno Pub Date : 2016-01-01 DOI: 10.12841/WOOD.1644-3985.149.01

Daniel Nilsson, R. Pettersson, T. Thörnqvist, M. Nylinder

引用次数: 3

The influence of heat treatment on the physico-chemical properties of pinewood (Pinus sylvestris L.) 热处理对松材理化性质的影响

IF 0.8 4区农林科学

Drewno Pub Date : 2016-01-01 DOI: 10.12841/WOOD.1644-3985.135.04

J. Zawadzki, J. Gawron, A. Antczak, T. Kłosińska, A. Radomski

引用次数: 6

Usefulness assessment of automatic air flow control system with oxygen sensor in a 20 kW boiler with periodic wood pellet supply 含氧传感器气流自动控制系统在20kw木屑颗粒周期性供应锅炉上的有效性评价

IF 0.8 4区农林科学

Drewno Pub Date : 2016-01-01 DOI: 10.12841/wood.1644-3985.174.08

M. Juszczak, W. Cichy, Katarzyna Pałaszyńska

{"title":"Usefulness assessment of automatic air flow control system with oxygen sensor in a 20 kW boiler with periodic wood pellet supply","authors":"M. Juszczak, W. Cichy, Katarzyna Pałaszyńska","doi":"10.12841/wood.1644-3985.174.08","DOIUrl":"https://doi.org/10.12841/wood.1644-3985.174.08","url":null,"abstract":"The benefits of applying automatic air flow control system with oxygen sensor in a 20 kW heating boiler with a retort furnace supplied periodically with wood pellets were examined. Boiler combustion chamber was not lined with ceramic blanket and therefore the fuel supply cycle duration (operation and stand-by) was set by the producer to just 20 seconds. Variation in time of carbon monoxide, nitric oxide, nitrogen oxides and oxygen concentrations in the flue gas, as well as correlations between: pollutant concentrations and temperature in the combustion chamber or oxygen concentration, temperature in the combustion chamber and oxygen concentration, nitric oxide and carbon monoxide concentrations were compared for different scenarios: with automatic air flow control and with constant air flow. It was concluded that applying automatic air flow control system with oxygen sensor did not significantly reduce carbon monoxide concentration (only by 10-15%). Most probably it is because the stand-by in fuel feeding is too short for the air supply fan to react. In order to reduce carbon monoxide concentration, instead of applying automatic air flow control it is preferable to obtain higher heat outputs (above 60% of its maximum value) and use higher capacity water heat storages.","PeriodicalId":50566,"journal":{"name":"Drewno","volume":null,"pages":null},"PeriodicalIF":0.8,"publicationDate":"2016-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"66330172","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: 1

Identification and characterisation of Douglas-fir (Pseudotsuga menziesii (Mirb.) Franco) juvenile and adult wood grown in Southern Germany 孟氏假杉木(pseudosuga menziesii, Mirb.)的鉴定与特性分析德国南部生长的幼木和成木

IF 0.8 4区农林科学

Drewno Pub Date : 2016-01-01 DOI: 10.12841/WOOD.1644-3985.C01.05

Jan H. Blohm, R. Evans, G. Koch, U. Schmitt

{"title":"Identification and characterisation of Douglas-fir (Pseudotsuga menziesii (Mirb.) Franco) juvenile and adult wood grown in Southern Germany","authors":"Jan H. Blohm, R. Evans, G. Koch, U. Schmitt","doi":"10.12841/WOOD.1644-3985.C01.05","DOIUrl":"https://doi.org/10.12841/WOOD.1644-3985.C01.05","url":null,"abstract":"More than one-third of Germany s Douglas-fir resources, stock in age-classes from twenty-one to fifty-nine years. As such timber increasingly enters markets, detailed knowledge of the anatomy and properties of its wood is of importance to forest managers and wood processors. Anatomical and mechanical wood analyses in this study were carried out on twenty trees from four scientifically managed plantations in Southern Germany. The age of the trees selected was forty-two years whereby varying growth conditions were considered. Juvenile and adult woods were identified by segmented linear regression of radial profiles of anatomical characteristics, such as latewood percentage, tracheid wall thickness microfibril angle and density. Additionally, the width of earlywood, latewood and growth rings as well as bending modulus of elasticity were determined. Variance was dependent on the trait used for differentiation, j uvenile wood comprised of an eleven to thirty-one growth rings resp. radial amounts of fifteen to sixty-five percent. When compared to adult wood, juvenile wood showed corresponding features of approximately thirty percent wider growth rings, th irty four percent lower latewood percentage, fourteen percent thinner tracheid walls, and eighty percent larger microfibril angles, eleven percent lighter wood and fifty -seven percent lower bending modulus of elasticity. As the assortment features fast grown trees, adult heartwood characteristics were slightly inferior to the characteristics of European Douglas-fir.","PeriodicalId":50566,"journal":{"name":"Drewno","volume":null,"pages":null},"PeriodicalIF":0.8,"publicationDate":"2016-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"66331070","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: 9