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International Conference on Intelligent Human-Machine Systems and Cybernetics

作者： Zhu, Xiao-Dong Cao, Jun Wang, Feng-Hu Key Laboratory of Bio-Based Material Science and Technology Ministry of Education Northeast Forestry University Harbin China

ISBN: (纸本)9780769541518

Data acquisition card and microphone were used to build wood non-destructive testing system based on virtual machines in this paper. Signals of non-destructive vibration experiments was collected and processed by the graphic program of labview6.1. The dynamic elastic modulus was acquired by the calculation frequency of vibration signals. The static elastic modulus was calculated by the mechanical testing machine. The results showed that the correlation coefficient of dynamic elastic modulus which was acquired by virtual machine method and FFT is 0.958. The correlation coefficient of elastic modulus which was acquired by virtual machine method and the mechanical testing machine is *** methods showed a highly degree of linear correlation and the virtual instrument can be applied to calculate the dynamic elastic modulus of wood. The non-destructive testing of wood based on virtual instrument technology has advantages of accurate, simple operation and low cost. © 2010 IEEE.

关键词： Nondestructive examination

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Reinforcing effects of Kevlar fiber on the mechanical properties of wood-flour/high-density-polyethylene composites

Reinforcing effects of Kevlar fiber on the mechanical proper...

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作者： Ou, Rongxian Zhao, Hui Sui, Shujuan Song, Yongming Wang, Qingwen MOE Key Laboratory of Bio-Based Material Science and Technology Northeast Forestry University Harbin 150040 China

Kevlar fibers (KFs) were used as a reinforcement for wood-flour/high- density-polyethylene composites (WF/HDPE) to improve the mechanical properties of the resulting composites. Addition of a small amount (2-3%) of KF caused an improvement in the tensile, flexural, and impact properties of WF/HDPE. Surface grafting of KF with a mixture of allyl chloride and 3- chloropropyltrimethoxysilane resulted in a further improvement on the mechanical properties of the resulting composites due to the increased interfacial compatibility between KF and HDPE as evidenced by scanning electron microscopy (SEM), X-ray photoelectron spectroscopy (XPS) and Fourier transform infrared spectroscopy (FTIR). It can accordingly be concluded that the grafted KF can be used as a reinforcement to improve the strength and toughness of WF/HDPE composites. © 2010 Elsevier Ltd. All rights reserved.

关键词： Reinforcement

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Fabrication of a novel wood-based composite by in-situ polymerization of functional monomers

Fabrication of a novel wood-based composite by in-situ polym...

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International Conference on Measuring technology and Mechatronics Automation, ICMTMA 2010

作者： Li, Yongfeng Liu, Yixing Li, Jian Lv, Duojun Fan, Xinzhen Key Laboratory of Bio-based Material Science and Technology Ministry of Education Northeast Forestry University Harbin China

ISBN: (纸本)9780769539621

In order to alternative the low-quality poplar wood for value-added applications, the study adopted a novel method by impregnating two functional monomers, Glycidyl Methacrylate (GMA) and Vinyl Acetate (VAc), into the porous structure of wood, and further initiating them for in-situ polymerization through a catalyst-thermal treatment. The microstructure of the resultant composite, and the main reaction mechanism between monomers and wood were characterized and analyzed by SEM and FTIR, and its performance such as mechanical properties, decay resistance and dimensional stability were also tested. The results indicate that the two functional monomers copolymerized in wood cell lumens, and grafted onto wood matrix, which evenly filled in wood cell lumens and tightly contacted wood cell walls. The modulus of rupture (MOR), modulus of elasticity (MOE), compression strength, and hardness of P(GMA-co-VAc)/Poplar Wood increased by 91%, 103%, 128% and 311% over those of untreated wood, respectively;and the dimensional stability, decay resistance of P(GMA-co-VAc)/Poplar Wood improved 51.6% and 92.4% than those of untreated wood, respectively. © 2010 IEEE.

关键词： Acrylic monomers

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Study on combustion properties of wood-polymethyl methacrylate composites

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Jianzhu Cailiao Xuebao/Journal of Building materials 2010年第3期13卷 357-362页

作者： Liu, Ming-Li Zhou, Jun-Hao Wang, Qing-Wen Liao, Heng Wang, Feng-Qiang Zhang, Zhi-Jun MOE Key Laboratory of Bio-Based Material Science and Technology Northeast Forestry University Harbin 150040 China

Wood-polymethyl methacrylate composites(WPC) were prepared by vacuum-pressure impregnation of wood veneer with methyl methacrylate and subsequent hot curing in the presence of azobisisobutyrynitrile as initiator. The combustion parameters of the prepared WPC were determined by a cone calorimeter and the combustion properties of prepared composite was compared with that of the untreated wood veneer. The results show that, compared to the untreated wood veneer, the WPC has prolonged time to ignition, and greater total heat release, while it has lower peak value of heat release rate and the more even heat release during the whole process of combustion, thus its fire performance index increases. This means that the flashover time of WPC would prolong in a fire;the total smoke production of WPC increases, while smoke releases more smoothly;the CO yield tends to decrease and its formation is somewhat delayed.

关键词： Polymethyl methacrylates

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Design of wood dyeing computer automatic color matching system

Design of wood dyeing computer automatic color matching syst...

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2010 2nd International Conference on Computer Engineering and technology, ICCET 2010

作者： Guan, Xuemei Guo, Minghui Cao, Jun Information and Computer Engineering College Northeast Forestry University Harbin 150040 China Key Laboratory of Bio-based Material Science and Technology Northeast Forestry University Harbin 150040 China

This design put forward a kind of computer color matching system design scheme based on fuzzy neural network and realizes its software design by C language programming. This system took the color differences between k... 详细信息

ISBN: (纸本)9781424463503

关键词： Fuzzy neural networks

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Study on wood dyeing pigment formula prediction model based on dynamic fuzzy neural network

Study on wood dyeing pigment formula prediction model based ...

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2010 2nd International Conference on Computer Engineering and technology, ICCET 2010

ISBN: (纸本)9781424463503

This paper studied a kind of wood dyeing pigment formula prediction model built by using dynamic fuzzy neural network. The relative error of this prediction model was 0.52% and its training time was 128s. The results were comparatively satisfactory. This method provided a new way for wood dyeing and color matching and a new idea for the applications of its theories in color matching system, so it had certain theoretical research and practical application value. © 2010 IEEE.

关键词： Fuzzy neural networks

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Characterization and photocatalytic activity of titanate nanotube using a solvothermal route

Characterization and photocatalytic activity of titanate nan...

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IEEE International Nanoelectronics Conference (INEC)

作者： Qingfeng Sun Haipeng Yu Yixing Liu Yongzhi Cui Qiongfang Yu Liyang Luo Key laboratory of Bio based Material Science and Technology of Ministry of Education Northeast Forestry University Harbin China Key laboratory of Bio-based Material Science and Technology of Ministry of Education Northeast Forestry University China

ISBN: (纸本)9781424435432

Mischcrystal titanate nanotube has been synthesized via a hydrothermal method on controlling the cosolvent solution. SEM, TEM, XRD, EDS, XPS, FT-IR and Brunauer-Emmett-Teller methods were used to characterize the shape and morphology, crystalline structure, sample formation and specific surface area of as-prepared nanotube. The composition of nanotube could be assigned as H 2 Ti 2 O 5 .H 2 O and Na 2 Ti 3 O 7 .nH 2 O crystal structures. The shape and morphology of nanotube underwent a drastic change with the emergence of rod-like form when the sintered temperature reached 600°C. The XRD patterns also confirmed the transformation accompanying the occurrence of sodium hexatitanates and rutile TiO 2 . When the calcination temperature arrived at 800°C, well-crystallized sodium hexatitanates with rod shape took place. The photocatalytic activities of prepared sample and calcined products were evaluated with rate constant by the decomposition of Rhodamine B. The results showed the initial nanotube had the highest specific surface area but without photocatalytic effect. With the sintered temperature reached 400 and 500°C, the calcined products showed positive photocatalytic activities and the rate constants were around three times than that of the precursor though their specific surface areas were not the largest. However, the heat treated samples in 700-900°C expressed negative photocatalytic effects along with the occurrence of nanorods and rutile titanium oxide.

关键词： Titanium compounds Temperature Surface morphology Shape Surface treatment X-ray scattering laboratories Crystallization Calcination Sun

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A note on the influence of pretreatment on the photodiscoloration by UV light as a function of energy of wood

A note on the influence of pretreatment on the photodiscolor...

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The 4th International Conference on bioinformatics and biomedical Engineering(第四届IEEE生物信息与生物医学工程国际会议 iCBBE 2010)

作者： Minghui Guo Xin Guan Key Lab.of Bio-Based Material Science and Technology of Ministry of Education Northeast Forestry University Harbin China

The effect of the pretreatment by acid and bleacher oncolor changes and FT-IR spectra of wood surfaces of *** due to irradiation has been examined. To monitor therelationship, L*, a*, b*, △E* parameters and FT-IR spectra ofsamples' surface were analyzed quantitatively byspectrophotometer and FT-IR at the different irradiation *** time was altered between 24, 48, 72, 96 and 120h. Ourfindings showed that acid treatment promoted photo-discolorationand bleaching treatment enhanced the lightnessvalue and b* value. The changes of the surface colors wererelated to carbonyl compounds, phenolic hydroxyl,paraquinones, ortho quinine and so on.

关键词： Bleaching Chemical analysis Color Surface treatment Temperature Application software materials science and technology Forestry Condition monitoring Humidity

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Volatile Organic Compounds Concentrations in New Apartment Buildings in Harbin, China

Volatile Organic Compounds Concentrations in New Apartment B...

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The 4th International Conference on bioinformatics and biomedical Engineering(第四届IEEE生物信息与生物医学工程国际会议 iCBBE 2010)

作者： Yu Liu Jun Shen Xiao-dong Zhu Key Laboratory of Bio-based Material Science and technology Northeast Forestry University Harbin China

Indoor air quality of the new building has become a major concentration in China. Volatile organic compounds (VOCs) in new buildings were investigated and factors significant to their presence were discussed. Concentrations of volatile organic compounds, temperature and humidity were measured in four new apartment buildings over 6 months following installation. Formaldehyde concentrations in the new buildings were relatively low in the new buildings, which can satisfy the Indoor air quality standard of 0.10mg/m3. But the benzene and total volatile organic compound (TVOC) concentrations were extremely higher indoor, they were approximately three to four times higher than IAQ standard. Simultaneous outdoor samples were also collected to determine indoor to outdoor I/O. ratios for every compound at each location, which showing a dominant effect of indoor sources. The study revealed that the indoor concentrations of selected VOCs on occasions could be significantly high due to various sources. The data presented here can be useful in developing air quality standards for indoor air.

关键词： Volatile organic compounds Building materials Ventilation Air pollution Windows Cleaning Indoor environments Protection laboratories materials science and technology

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Non-destructive testing of wood composites based on virtual instrument

Non-destructive testing of wood composites based on virtual ...

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Congress on Image and Signal Processing, CISP

作者： Xiao-dong Zhu Jun Cao Feng-hu Wang Yu Liu Key laboratory of Bio-Based Material Science and Technology Ministry of Education Northeast Forestry University Harbin China

A suit of wood-based composite nondestructive virtual instrument system based on labview was designed in this paper. The sample of poplar Laminated Veneer Lumber was used to discuss the feasibility of the applications of virtual instrument in the wood-based composite nondestructive test. The main results are as follows: the longitudinal resonance elasticity modulus that was measured by virtual instrument can be the token of conventionality static elasticity modulus and FFT because they had prominent correlation under the level of 0.01.

关键词： Vibrations Instruments Testing Resonant frequency Elasticity Frequency domain analysis Correlation

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