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1. Research on the statistical analysis method of bamboo scrimber axial strength based on different models and experiments | |||
Sun Songsong,Xu Zhiyuan | |||
Forestry 07 August 2023 | |||
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Abstract:Bamboo scrimber is a new natural fiber reinforced composite material in modern industry. In this paper, the strength characteristics of this material were chosen as the object of study. First, axial tensile and compressive fracture experiments were conducted on different test specimens to determine the corresponding strength data. Then three commonly used distribution models were applied to analyze the relationship between the strength and survival rate. The results show that compared with the compressive data, the tensile data demonstrate more obvious dispersion. In addition, the three-parameter Weibull model fits the data best and may be used as the fundamental model for future analysis. This paper provides a solid foundation for better understanding the mechanism of the bamboo scrimber strength phenomenon. | |||
TO cite this article:Sun Songsong,Xu Zhiyuan. Research on the statistical analysis method of bamboo scrimber axial strength based on different models and experiments[OL].[ 7 August 2023] http://en.paper.edu.cn/en_releasepaper/content/4761216 |
2. Changes of Sleep Manifestation in Response to Bedding Layers Structure and Mattress Firmness | |||
CHEN Yuxia,GUO Yong,ZHANG Kaiting,SU Na,DU Mengli,LIU Shengquan | |||
Forestry 26 April 2017 | |||
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Abstract:The structural properties of mattress bedding layer and the mattress firmness directly affect support properties of the mattress on human body, and further influence sleep initiation and maintenance. This study combined subjective evaluation and sleep registrations to investigate whether the structural properties of mattress bedding layer and mattress firmness affected sleep quality in healthy subjects. Altogether, 11 normal female sleepers participated in actual sleep experiments on 18 experimental mattresses. Subjects spent more than 4 nights on each of the 18 mattresses in the sleep laboratory. During these days, polysomngraphy was performed and subject body movements were recorded using Ingra-red video cameras. Subjective sleep data were gathered by means of self-report sleep diaries and visual analogue scales. Results showed that average amount of time per night that spent in supine posture (53.02%) were longer than that in lateral posture (45.88%). Mattress bedding layer and its properties influenced sleep quality even more than mattress firmness. Chinese people preferred to sleep in supine posture, the improvement comfort in supine position by means of ergonomic mattress design will do favor sleep. | |||
TO cite this article:CHEN Yuxia,GUO Yong,ZHANG Kaiting, et al. Changes of Sleep Manifestation in Response to Bedding Layers Structure and Mattress Firmness[OL].[26 April 2017] http://en.paper.edu.cn/en_releasepaper/content/4728488 |
3. Preparation of chitin nano-fiber (DEChN) dispersions mediated by various protonic acid | |||
Zhiguo Wang,Hui Li,Yimin Fan | |||
Forestry 24 November 2016 | |||
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Abstract:Partially deacetylated chitin nano-fiber (DAChN) dispersions were prepared through mechanical treatment of partially deacetylated crab shell α-chitin under acid conditions mediated by various protonic acids. The representative organic acids (monovalent acid: acetic acid, polyvalent acid: succinic acid, hydroxyl acid: gluconic acid, vinyl acid: itaconic acid, amino acid: aspartic acid) had a better efficiency on mediating nanofibrillation of chitin fibers than inorganic acid (HCl). The DAChN dispersed in water at pH 3.5 mediated by gluconic acid exhibited the highest yield of nano-fibers (88.6%), followed by succinic, itaconic, and ascorbic acid with nano-fiber yield of 79.9%, 73.3% and 66.0%, respectively. The pH value, conductivity, viscosity and light transmittance of dispersions were assessed under different storage time. All of the tested DAChN dispersions were stable for at least 15 weeks at 4℃. | |||
TO cite this article:Zhiguo Wang,Hui Li,Yimin Fan. Preparation of chitin nano-fiber (DEChN) dispersions mediated by various protonic acid[OL].[24 November 2016] http://en.paper.edu.cn/en_releasepaper/content/4709999 |
4. Improvement of weatherability of wood through hydrothermal synthesizing titanium dioxide coating | |||
LIU Yixing,LIU Yongzhuang,FU Yanchun,YU Haipeng | |||
Forestry 05 May 2016 | |||
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Abstract:The weathering stability of wood during long-term exposure to outdoor atmosphere is an important issue. Topcoat is one of the crucial methods for protecting wood polymer substrates from environmental factors, such as solar radiation and moisture. In the present study, titanium dioxide (TiO2) coating was synthesized on wood surface using the hydrothermal method to improve its weathering resistance capability. Both the TiO2-coated and control wood were exposed to artificial accelerated weathering for 40 circles (nearly 1 000 h). Color measurements were conducted at intervals throughout the test period, and presented in ΔL*, Δa*, Δb*, and overall color changes (ΔE). Results show that the TiO2-coated wood had better color stability than the control wood. This demonstrates the ability of TiO2 coating to retard color change in wood. Furthermore, the stimulus and opalescence of TiO2 resulted in a whitening effect on the wood after 100 h of exposure. The compositional changes on the wood surface were characterized via Fourier transform infrared spectroscopy. The differences in absorption intensity at 1640 and 1375 cm?1 between the TiO2-coated and control wood suggest the positive contribution of the TiO2 coating to the compositional stability of lignin during the weathering aging process. | |||
TO cite this article:LIU Yixing,LIU Yongzhuang,FU Yanchun, et al. Improvement of weatherability of wood through hydrothermal synthesizing titanium dioxide coating[OL].[ 5 May 2016] http://en.paper.edu.cn/en_releasepaper/content/4686512 |
5. Cellulose Esterification and Its Application to Films | |||
Zhiguo Wang,Yandan Zhou,Yiqin Yang | |||
Forestry 09 May 2014 | |||
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Abstract:Homogeneous esterification of cellulose with octanoyl chloride (a long-chain fatty acid) was investigated in lithium chloride/N,N-dimethyl acetamide (LiCl/DMAc) medium. Cellulose was readily esterified by the octanoyl chloride, as shown by NMR analysis. The effects of the ratio of octanoyl chloride to cellulose hydroxyl groups, the reaction temperature, and the reaction time on the yield and degrees of substitution (DS) of cellulose esters (CEs) were investigated. CEs with high DS (2.2) were achieved after 8 h at 100 C with a 1.6 to 1.8 of molar ratio of octanoyl chloride to cellulose hydroxyl groups. Furthermore, hydrophobic, fully transparent CE films and aerogels were prepared using CE tetrahydrofuran (THF) solutions. The CE aerogels exhibited high porosity and were formed with evenly distributed porosity, as revealed by scanning electron microscopy (SEM). | |||
TO cite this article:Zhiguo Wang,Yandan Zhou,Yiqin Yang. Cellulose Esterification and Its Application to Films[OL].[ 9 May 2014] http://en.paper.edu.cn/en_releasepaper/content/4596712 |
6. Calculation Method of MDF Continuous Press Quality Control Based on Burgers Model | |||
WANG Chunxiao,LIU Yaqiu,WU Qu | |||
Forestry 08 May 2014 | |||
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Abstract:In this paper, to solve the problems such as bubbling and stratification on medium density fiberboard (MDF) in the processing and application, a quality control process based on MDF viscoelastic is proposed. Firstly, the creep compliance equation was deduced by studying the constitutive equation and the creep equation of viscoelastic Burgers model. Secondly, a tension and compression stiffness-creep compliance model based on the principle of dimensional homogeneous was built. And then after analyzing the servo-mechanisms and hydraulic loading system respectively, a model of the hydraulic position servo control system with pressure feedback was proposed by introducing the factors of pull-pressing rigidity and hydraulic rigidity. Finally, the slab hot-pressing control system with viscoelastic properties is simulated on the basis of the model of the hydraulic position servo control system with pressure feedback. The simulation results indicate that the precision of controlled object can be improved and the adverse effects brought by viscoelastic properties can be restrained through reasonable design of controller effectively. | |||
TO cite this article:WANG Chunxiao,LIU Yaqiu,WU Qu. Calculation Method of MDF Continuous Press Quality Control Based on Burgers Model[OL].[ 8 May 2014] http://en.paper.edu.cn/en_releasepaper/content/4596580 |
7. Chemical Composition and Enzymatic Saccharification of Poplar | |||
MENG Xin,GENG Wenhui,JIN Yongcan | |||
Forestry 13 April 2014 | |||
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Abstract:Green liquor (Na2S + Na2CO3, GL) pretreatment is an effective pathway for improving the enzymatic digestibility of lignocellulosic biomass for the production of bioethanol. In this work, GL was employed as a pretreatment to enhance the enzymatic saccharification of poplar. During pretreatment, the increase of H-factor and TTA charge resulted in enhanced delignification and increased degradation of polysaccharides. The sugar yield of enzymatic hydrolysis increased rapidly with increasing TTA charge in GL pretreatment, while the effect of different H-factors (from 400 to 800) on sugar yield was unnoticeable. The pretreated solid recovery was 75.5% at a lignin removal rate of 29.2% under optimized conditions of total titratable alkali (TTA) charge 20%, sulfidity 25%, and H-factor 400. The sugar yield of glucan, xylan, and total sugar of GL-pretreated poplar in enzymatic hydrolysis reached up to 89.9%, 65.5%, and 82.8%, respectively, at a cellulase loading of 40 FPU/g-cellulose. | |||
TO cite this article:MENG Xin,GENG Wenhui,JIN Yongcan. Chemical Composition and Enzymatic Saccharification of Poplar[J]. |
8. Effect of sample width on characteristics of flame spread across eucalyptus wood surface | |||
WU Guihong,WU Yiqiang,HU Yunchu,ZHU Xiaodan,YANG Jianming | |||
Forestry 02 July 2013 | |||
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Abstract:To study the effect of sample width on flame spread characteristics, a series of laboratory-scale experiments were conducted employing eucalyptus wood with width from 3 to 7 cm. Flame dimension, flame spread rate and mass loss rate were obtained. The relationship between these flame spread characteristics and sample width was explored. Both the dimensionless average flame height and depth vary as the -n power of sample width. With the increase of sample width, both the flame spread rate and mass loss rate first decrease and then rise. The minimum values appear when sample width measures 6 cm. | |||
TO cite this article:WU Guihong,WU Yiqiang,HU Yunchu, et al. Effect of sample width on characteristics of flame spread across eucalyptus wood surface[OL].[ 2 July 2013] http://en.paper.edu.cn/en_releasepaper/content/4547653 |
9. Characterization of wood cell wall components by using LiCl/DMSO solvent system | |||
Zhiguo Wang,Zhulan Liu,Yunfeng Cao | |||
Forestry 19 March 2013 | |||
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Abstract:The fractionation of wood cell wall components was achieved by the application of the LiCl/DMSO solvent system developed in our previous study. Various soluble and insoluble fractions were prepared from beech milled wood by extractions with DMSO containing different amounts of lithium chloride (LiCl) for the study of lignin-carbohydrate complex (LCC). Nitrobenzene oxidation (NO) analyses demonstrated that the lignin in the soluble fractions always has lower yields of NO products consisting of syringaldehyde + syringic acid (Sy) and vanillin + vanillic acid (Va). The syringyl ratios, Sy/(Sy+Va), were also lower than in insoluble fractions. Accordingly, lignins with lower syringyl ratios are better soluble than those with higher syringyl ratios. The former is typical in primary wall and the latter in secondary wall. Solubilization of glucan is significantly dependent on the LiCl concentration in DMSO. In the absence of LiCl, only about 6% of glucan was found in the soluble fraction, but about 40% of lignin and xylan were solubilized. The additional 40% of lignin and xylan became soluble together with glucan solubilization increased at 3% LiCl concentration. However, a fraction amounting to 13% (based on the whole wood) is still remained as a residue under these conditions. Glucan solubilization could not be the reason for this observation as ball-milled cellulose is soluble in 3% LiCl/DMSO. Probably, strong interactions between lignin and carbohydrates prevent solubilization of this fraction, that has never been isolated and analyzed in previous studies. | |||
TO cite this article:Zhiguo Wang,Zhulan Liu,Yunfeng Cao. Characterization of wood cell wall components by using LiCl/DMSO solvent system[OL].[19 March 2013] http://en.paper.edu.cn/en_releasepaper/content/4530916 |
10. Cellulose/hydroxyapatite nanocomposites: microwave-assisted synthesis and characterization in LiCl/N,N-dimethylacetamide solvent | |||
MA Mingguo | |||
Forestry 28 January 2013 | |||
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Abstract:It is well-known that LiCl/N,N-dimethylacetamide solvent is a good medium for dissolution of cellulose. In this article, cellulose/hydroxyapatite (HA) nanocomposites were carried out using microcrystalline cellulose, CaCl2, and NaH2PO4 via microwave-assisted method. The cellulose solution was previously prepared by the dissolution of microcrystalline cellulose in LiCl/N,N-dimethylacetamide solvent. The cellulose/HA nanocomposites were characterized by X-ray powder diffraction (XRD), Fourier transform infrared spectrometry (FTIR), and scanning electron microscopy (SEM). We also investigated the effects of heating times, heating temperatures, and the reactant concentrations on the phases, microstructures, and morphologies of the cellulose/HA nanocomposites. This microwave-assisted method has advantages of being simple, rapid, low-cost, and environmentally friendly. The cellulose/HA nanocomposites could be a candidate for the biomedical applications. | |||
TO cite this article:MA Mingguo. Cellulose/hydroxyapatite nanocomposites: microwave-assisted synthesis and characterization in LiCl/N,N-dimethylacetamide solvent[OL].[28 January 2013] http://en.paper.edu.cn/en_releasepaper/content/4518734 |
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