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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. Genome-wide analysis of poplar SAUR gene family and expression profiles | |||
Hu Wenfang,Chen Zhu,Xiang Yan | |||
Forestry 23 April 2017 | |||
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Abstract: In this paper, 105 SAUR genes were identified and comprehensively analyzed in Populus trichocarpa. According to the phylogenetic relationship, the PtSAURs were classified into seven groups. 100 of the 105 PtSAURs were randomly distributed on nineteen chromosomes, others were located in scaffold; these genes were mainly evolved by segmental duplication. Ninety-four PtSAURs had no intron and each group had a similar conserved motif structure. Various cis-elements about growth, development and stress responses were discovered in promoters of PtSAURs and the orthology relationships of SAURs between Arabidopsis, rice, grape and poplar were established by synteny analysis. The analysis of expression profiles and qRT-PCR indicated that PtSAURs show different expression levels in various tissues and treatments. In summary, this study may provide a foundation for further studies of the function of SAURs in poplar growth and development. | |||
TO cite this article:Hu Wenfang,Chen Zhu,Xiang Yan. Genome-wide analysis of poplar SAUR gene family and expression profiles[OL].[23 April 2017] http://en.paper.edu.cn/en_releasepaper/content/4728479 |
4. An ecologically based system for sustainable agroforestry in sub-tropical and tropical forests | |||
SUN Yuan,CAO Fuliang,WELHAM Clive,PELZ R.Dieter,WEI Xiaohua,CHEN Lei,YANG Qing | |||
Forestry 05 April 2017 | |||
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Abstract:Forests in tropical and sub-tropical countries face severe pressures due to a combination of poverty and environment degradation. To be effective, measures to protect these forests must therefore consider both economic and ecological dimensions synergistically. The purpose of this paper was to synthesize our long-term work (1994-2015) on a Ginkgo agroforestry system and demonstrate its potential for achieving both goals, and discuss its wider application in tropical and sub-tropical countries. The performance of various ecological, economic, and social indicators was compared among five Ginkgo agroforestry systems. Two integrated indicators, Harmony Degree (HD) and Development Degree (DD), were also used to show the integrated performance of these indicators. Ginkgo-Wheat-Peanut (G+W+P) and Ginkgo-Rapeseed-Peanut (G+R+P) are the best systems when compared to pure and mixed Ginkgo plantations, or pure agricultural crops. Results demonstrate that it is possible to achieve both economic development and environmental protection through implementation of sustainable agroforestry systems in sub-tropical regions. | |||
TO cite this article:SUN Yuan,CAO Fuliang,WELHAM Clive, et al. An ecologically based system for sustainable agroforestry in sub-tropical and tropical forests[J]. |
5. 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 |
6. A Method for Wildflower Meadow Landscape Evaluation | |||
FANG Weiwei,LIU Xue,YUAN Tao | |||
Forestry 22 June 2016 | |||
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Abstract:wildflower meadow landscape has particular ornamental value and high ecological benefits thus people now pay much attention to this landscape form. But the artificial meadow landscape is of varying qualities and people can only give them a qualitative analysis and the qualitative analyses are mostly focused on their ornamental level. This paper tried to build a comprehensive evaluation model which combined quantitative and qualitative analyses on ornamental quality, ecological quality and using quality by using the method of Analytical Hierarchy Process. And finally, we use the model to grade three meadows, the natural meadow, one foreign excellent case of artificial meadow and a common domestic artificial meadow. By comparing them, we can see in which aspects we can still make improvements in designing to a wildflower meadow. | |||
TO cite this article:FANG Weiwei,LIU Xue,YUAN Tao. A Method for Wildflower Meadow Landscape Evaluation[OL].[22 June 2016] http://en.paper.edu.cn/en_releasepaper/content/4698355 |
7. K-Step Adaptive Cluster Sampling with Horvitz-Thompson Estimator | |||
Zhu Guangyu | |||
Forestry 06 June 2016 | |||
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Abstract:Adaptive cluster sampling (ACS) has widely been used for data collection of environment and natural resources. However, the randomness of its final sample size often impedes the use of this method. To control the final sample sizes, in this study a k-step ACS based on Horvitz-Thompson (HT) estimator was developed and an unbiased estimator was derived. The k-step ACS Horvitz-Thompson (ACS-HT) was examined first using a simulated example and then using a real survey for numbers of plants for three species that were characterized by clustered and patchily spatial distributions. The effectiveness of this sampling design method was assessed in comparison with ACS Hansen-Hurwitz (ACS-HH) and Horvitz-Thompson (ACS-HT) estimators, and k-step ACS-HT estimator. The effectiveness of using different k-step sizes was also compared. The results showed that k-step ACS-HT estimator was most effective and ACS-HH was least. Moreover, stable sample mean and variance estimates could be obtained after a certain number of steps, but depending on plant species. K-step ACS without replacement was slightly more effective than that with replacement. In K-step ACS, the variance estimate of 1-step ACS is more big than other K-step ACS (k>1), but it is more small than ACS. This implies that -step ACS is more effective than traditional ACS, besides, the final sample size can be controlled easily in population with big clusters. | |||
TO cite this article:Zhu Guangyu. K-Step Adaptive Cluster Sampling with Horvitz-Thompson Estimator[OL].[ 6 June 2016] http://en.paper.edu.cn/en_releasepaper/content/4695965 |
8. 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 |
9. Deriving merchantable volume in poplar through non-destructive terrestrial laser scanning | |||
SUN Yuan,LIANG Xinlian,LIANG Ziyu,LI Weizheng,WELHAM Clive | |||
Forestry 18 April 2016 | |||
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Abstract:Timber volume is an important ecological component in forested landscapes. The application of Terrestrial Laser Scanning (TLS) to volume estimation has been widely accepted though few species have well-calibrated taper functions. This research uses TLS technology in poplar (Populus × canadensis Moench cv. 'I- 72/58') to extract stem diameter at different tree heights and establish the relationship between point cloud data and stem curve, which constitutes the basis for volume estimation of single trees and the stand. Eight plots were established and scanned by TLS. Stem curve functions were then fitted after extraction of diameters, DBH and tree heights from the point cloud data. Lastly, six functions were evaluated by R2 and RMSE. A modified Schumacher equation was the most suitable taper function. Volume estimates from the TLS-derived taper function were better than those derived using the stem-analysis data. Finally, regression analysis showed that predictions of stem size were similar when data were based on TLS versus stem analysis. Its high accuracy and efficiency indicates that TLS technology can play an important role in forest inventory assessment. | |||
TO cite this article:SUN Yuan,LIANG Xinlian,LIANG Ziyu, et al. Deriving merchantable volume in poplar through non-destructive terrestrial laser scanning[J]. |
10. Analysis on pyrolytic kinetics and pyrolysates characteristics of deinking sludge in papermaking industry | |||
LOU Rui,WU Shubin,ZHANG Anlong,LI Zhijiang,ZHANG Bin | |||
Forestry 23 August 2015 | |||
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Abstract:In order to indagate the utilization of sludge biomass to bioenergy, fast pyrolysis as one of thermochemical conversion technlogies was applied in deinking sludge from the pulp and papermaking industrial. The static pyrolysis tubular furnace as a small scale industrial test was carried out to get pyrolysis products, and pyrolysis behaviours and products of the deinking sludge were characterized. The results revealed that the weight-loss process of deinking sludge was a non-isothermal reaction and composed of four stages, i.e. dewater stage, volatile releasing stage, carbon burnout stage and calcium carbonate decomposition, and the kinetic of deinking sludge pyrolysis was a third-order reaction. The pyrolysis products in the industrial tubular furnace were comprised of the gasesous (29.78%), the condensed bio-oil (24.41%) and the solid residues (45.81%). The volatile component in pyrolysis products was almost aromatic hydrocarbons, i.e. styrene, toluene and benzene and few acids and the solid was calcium carbonate that can be reused as paper filler. The deinking sludge was converted into high-grade fuel and chemicals. Therefore, pyrolysis of paper deinking sludge had a promising development on the comprehensive utilization. | |||
TO cite this article:LOU Rui,WU Shubin,ZHANG Anlong, et al. Analysis on pyrolytic kinetics and pyrolysates characteristics of deinking sludge in papermaking industry[OL].[23 August 2015] http://en.paper.edu.cn/en_releasepaper/content/4653022 |
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