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Multiple Time-scale Characteristics of Runoff Variations in Middle Reaches of Huolin River and Their Effects

Chinese Geographical Science 2007年第2期17卷 143-150页

作者： lu xiaoning DENG Wei ZHANG Shuqing Northeast Institute of Geography and Agroecology Chinese Academy of Sciences Changchun 130012 China Institute of Mountain Hazards and Environment Chinese Academy of Sciences Chengdu 610041 China Graduate University of Chinese Academy of Sciences Beijing 100049 China Chengdu University of Information Technology Chengdu 620225 China

The Huolin River is one of the most important water sources for Xianghai wetland, Horqin wetland, and Chaganhu wetland in the western Songnen Plain of Northeast China. The annual runoff series of 46 years at Baiyunhushuo Hydrologic Station, which is located in the middle reaches of the Huolin River, were analyzed by using wavelet analysis. Main objective was to discuss the periodic characteristics of the runoff, and examine the temporal patterns of the Huolin River recharging to the floodplain wetlands in the lower reaches of the river, and the corresponding effects of recharging variation on the environmental evolution of the wetlands. The results show that the annual runoff varied mainly at three time scales. The intensities of periodical signals at different time scales were strongly characterized by local distribution in its time frequency domain. The interdecadal variation at a scale of more than 30yr played a leading role in the temporal pattern ofrnnoffvariation, and at this scale, the runoffat Baiyunhushuo Hydrologic Station varied in turn of flood, draught and flood. Accordingly, the landscape of the floodplain wetlands presented periodic features, especially prominent before the 1990s. Compared with intense human activities, the runoff periodic pattern at middle （10-20yr） and small （1-10yr） scales, which has relatively low energy, exerted unobvious effects on the environmental evolution of the floodplain wetlands, especially after the 1990s.

关键词： floodplain wetland runoff multiple time-scale wavelet analysis Huolin River

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Hydrophobic Poplar Prepared via High Voltage Electric Field(HVEF)with Copper as Electrode Plate

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Journal of Renewable Materials 2022年第11期10卷 2907-2919页

作者： Jianxin Cui Zehui Ju lu Hong Biqing Shu xiaoning lu College of Materials Science and Engineering Nanjing Forestry UniversityNanjing210037China School of Forestry and Landscape Architecture Anhui Agricultural UniversityHefei230036China College of Civil Engineering Yangzhou Polytechnic InstituteYangzhou225127China

In order to improve hydrophobic characteristics which will affect the service performance of fast-growing poplar due to growing bacteria in the humid *** this study,a simple method was proposed to treat poplar via the high voltage electric field(HVEF)with copper as the electrode *** electron microscope(SEM),Fourier transforms infrared spectroscopy(FTIR),X-ray diffraction(XRD)and contact angle tester were adopted to evaluate the surface morphology,surface group of poplar,crystallinity and wettability under *** was found by SEM that a large number of copper particles were uniformly attached to the surface of *** all three sections,the weight percentage of the Cu element was accounting for more than *** diffraction peaks of copper-containing compounds appeared in the(XRD).FTIR analysis confirmed that the reaction between copper and poplar took *** surface contact angle of three sections of poplar increased in the following order:cross section

关键词： Poplar high voltage electric field wettability hydrophobic copper particles

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Improving the Properties of Fast-Growing Chinese Fir by Vacuum Hot Pressing Treatment

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Journal of Renewable Materials 2021年第1期9卷 49-59页

作者： lu Hong Biqing Shu Qian He Zehui Ju Haiyang Zhang xiaoning lu College of Materials Science and Engineering Nanjing Forestry UniversityNanjing210037China College of Civil Engineering Yangzhou Polytechnic InstituteYangzhou225127China

Chinese fir was compressed by vacuum hot pressing and conventional hot pressing at different temperatures(180℃,200℃ and 220℃),*** color parameters of the heat-compressed sample were measured,the relative mechanical properties of the material were tested and changes in the chemistry of fir were investigated using Fourier transform infrared spectroscopy(FTIR)and Xray photoelectron spectroscopy(XPS).The results indicated that the color difference between compressed and untreated wood increased gradually with the increase of *** with the conventional hot pressing treatment,the color difference(ΔE*)of the Chinese fir treated by vacuum hot pressing decreased by 43.73%,69.91%,and 77.17%,*** mechanical properties(bending elastic modulus and bending strength)of Chinese fir treated by vacuum hot pressing were significantly *** 24-hour water absorption thickness expansion rate of fir treated by vacuum hot pressing is smaller than that of conventional hot *** is implied that vacuum hot pressing treatment is an effective method to produce compressed wood,which can improve the mechanical properties and dimensional stability of wood,and reduce the influence of carbonization on wood color.

关键词： Chinese fir vacuum hot pressing color mechanical properties dimensional stability

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Curing Process of Phenol Formaldehyde Resin for Plywood under Vacuum Conditions

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Journal of Renewable Materials 2023年第9期11卷 3447-3461页

作者： Guobing Xiong lu Hong Zehui Ju xiaoning lu Juwan Jin College of Furnishings and Industrial Design Nanjing Forestry UniversityNanjing210037China School of Forestry&Landscape Architecture Anhui Agricultural UniversityHefei230036China College of Materials Science and Engineering Nanjing Forestry UniversityNanjing210037China

The study characterized the curing behaviors of phenol formaldehyde(PF)resin under different vacuum degrees and explored the properties of 9-ply plywood panels hot-pressed under both vacuum and atmospheric *** changes in core temperature and moisture content of the plywood mats during hot pressing were investigated as *** was found that the gel times and gel temperatures of PF resin decreased with the increase of vacuum degree using a self-made *** spectra indicated the degree of polycondensation of hydroxymethyl gradu-ally increased with the increase in *** was also observed that a higher degree of vacuum led to a slower polycondensation reaction rate of PF *** different hot-pressing processes,the bonding strengths in the innermost and uppermost gluelines of the vacuum hot-pressed plywood panels were up to 30%–50%higher than their counterparts of conventional hot-pressed products.A less difference in the bonding strengths between these two gluelines was also observed for vacuum hot-pressed *** addition,the core of vacuum hot-pressed plywood was found to have a greater heating rate and higher temperature at thefinal stage of hot pressing,which was beneficial to cure the PF *** results from this study indicate a promising potential of introducing a vacuum during hot pressing to improve the quality and productivity of plywood products and provide a basis for adopting vacuum to hot press wood composites.

关键词： Phenol formaldehyde resin vacuum gel time FTIR plywood bonding strength

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Classification of Principal Wood Species in China Based on the Physiomechanical Properties

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Journal of Renewable Materials 2023年第3期11卷 1425-1437页

作者： Jianyi Zhu Hui Peng xiaoning lu Jianxiong Lyu Tianyi Zhan College of Materials Science and Engineering Nanjing Forestry UniversityNanjing210037China Co-Innovation Center of Efficient Processing and Utilization of Forest Resources Nanjing Forestry UniversityNanjing210037China Research Institute of Wood Industry of Chinese Academy of Forestry Beijing100091China

Many tree species are planted in China with variable properties and *** exploring the structure-properties relationships of wood and classifying the species more reasonably,the physiomechanical properties of the domestic wood species in China were analyzed *** to the correlation analysis,the mechanical properties were closely related to the wood *** impact toughness and cleavage strength,the correlation coefficients between mechanical properties and densities were more than ***,shrinkage properties showed fewer correlations with densities,and the coefficient was no more than *** component analysis was proved to be feasible to explore the information of the physiomechanical *** principal components(PC1 and PC2)could account for most of the ***1 and PC2 were designated as density-dominated and shrinkage-associated factors,*** domestic wood species in China could be classified into 4 clusters based on their physiomechanical *** to the cluster results,reasonable grading was proposed for air-dried density,volume shrinkage,modulus of rupture,compression strength parallel to grain and hardness in cross *** statistical results brought insights into analyzing the physiomechanical properties of domestic Chinese wood species,which was helpful for developing strategies of tree breeding and technologies of wood processing.

关键词： Chinese wood species physiomechanical properties primary component analysis cluster analysis grading

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Bamboo Nail:A Novel Connector for Timber Assemblies

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Journal of Renewable Materials 2021年第9期9卷 1609-1620页

作者： Yehan Xu Zhifu Dong Chong Jia Zhiqiang Wang xiaoning lu College of Materials Science and Engineering Nanjing Forestry UniversityNanjing210037China

Nail connection is widely used in engineering and construction *** this study,bamboo nail was proposed as a novel connector for timber *** depth of bamboo nail into wood was predicted and *** influence of nail parameters(length,radius and ogive radius)on penetration depth were *** both tested and predicted results,the penetration depth of bamboo nail increased with the increasing length,radius or ogive *** addition,the effect of densification on penetration depth or mechanical properties was evaluated.1.12 g/cm^(3) was a critical density when densification was needed,and further increment of density would decrease the penetration depth of *** results of this study manifests that the proposed model is capable to predict the penetration depth of bamboo *** findings may provide new insight into efficiently utilization of bamboo resources.

关键词： Nail connection bamboo nail penetration depth nail parameter densification

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Review on the Application of Bamboo-Based Materials in Construction Engineering

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Journal of Renewable Materials 2020年第10期8卷 1215-1242页

作者： Biqing Shu Zhongping Xiao lu Hong Sujun Zhang Chen Li Naiqiang Fu xiaoning lu The College of Materials Science and Engineering Nanjing Forestry UniversityNanjing210037China College of Civil Engineering Yangzhou Polytechnic InstituteYangzhou225127China

Due to the continuously increasing demand for building materials across the world,it is necessary to use renewable materials in place of the existing nonrenewable materials in construction *** is a fast-growing flowering plant that may be used as a renewable material in *** use of bamboo in the construction of buildings can improve its long-term carbon fixation capacity and economic *** bamboo has the advantages of superior performance,low carbon content,high energy-saving and emission-reducing capacity,bamboo is an anisotropic material,which has many factors affecting its material performance,large variability of material performance,lack of systematic research,and the use of bamboo as the main building material is not always *** paper systematically summarizes the research status of bamboo as a building material from the aspects of bamboo composition,gradation,material properties,bamboo building components,connection nodes,and use of artificial *** this basis,some constructive suggestions are put forward for the further study of bamboo in the field of architecture.

关键词： Bamboo building element connection node glue-laminated bamboo bamboo scrimber binderless plywood

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Study on the Bonding Performance of the Moso Bamboo Dowel Welded to a Poplar Substrate Joint by High-Speed Rotation

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Journal of Renewable Materials 2021年第7期9卷 1225-1237页

作者： Suxia Li Haiyang Zhang Biqing Shu Liangsong Cheng Zehui Ju xiaoning lu College of Materials Science and Engineering Nanjing Forestry UniversityNanjing210037China College of Furniture and Art Design Central South University of Forestry and TechnologyChangsha410004China College of Civil Engineering Yangzhou Polytechnic InstituteYangzhou225127China

The wood friction welding technique with its high bonding strength,low cost,high efficiency,and without any adhesive has been increasing concern in *** bamboo(Phyllostachys pubescens)and poplar(Populus sp.)are widely planted and used in the furniture industry,interior decoration,and wood structure construction in *** aim of this work was to investigate the bonding performance of moso bamboo dowel rotation welded joints with different dowel/receiving hole diameter *** results indicated that the ratio of dowel/receiving hole diameter was an important parameter that influenced the welding *** bonding strength of the bamboo-to-poplar welded joints at the optimal ratio of 10/7 was as high as 7.50 MPa,which was higher than that of the beech(Fagus sylvatica,L.),schima(Schima superba)dowels and PVAc glued *** temperature measurement results showed a peak temperature of bamboo dowel welding as high as 350–360°*** differences in the temperature curves between each dowel/hole diameter ratio group were observed at the three different hole depths,such as the friction time,peak temperatures,and stabilization time at the maximum temperature,which could explain the differences in welding strengths between different *** SEM results showed the temperature-induced softening,melting and flowing of cell-interconnected polymer material in the wood and bamboo struc*** addition,the bamboo fibers(mainly vascular bundles)were wrapped to form a dense continuous bonding layer,similar to the reinforced concrete,thus producing a good bonding *** Fourier transform-infrared spectroscopy(FT-IR)analyses showed that the high temperature resulted in the increase of the lignin relative content due to the degradation reaction of cellulose in the welding zone,which improved the bonding properties.

关键词： Moso bamboo rotation welding tensile strength optimal ratio poplar

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Structure Design and Properties of Three-Layer Particleboard Based on High Voltage Electrostatic Field(HVEF)

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Journal of Renewable Materials 2021年第8期9卷 1433-1445页

作者： Man Yuan lu Hong Zehui Ju Wenli Gu Biqing Shu Jianxin Cui xiaoning lu Zhiqiang Wang College of Materials Science and Engineering Nanjing Forestry UniversityNanjing210037China

In this study,the effects of three different particle sizes of wood wastes(A=–8+12 mesh;B=–12+20 mesh;C=–20+30 mesh)and factory shavings(D)on the properties of particleboard were *** to the test results,three-layer particleboard was *** face layers made with mixture of A,B,and *** core layer made with *** ratio of core layer to face layers is 50:***-layer particleboard were fabricated with 12%urea-formaldehyde(UF)resins and three different high voltage electrostatic field intensities(0 kv,30 kv,60 kv).The internal bond(IB)strength,modulus of rupture(MOR),modulus of elasticity(MOE),thickness swelling(TS),and water absorption(WA)of particleboard were *** density distribution of the three-layer particleboard were examined by vertical density profiles(VDP),and the bonding mechanism and functional groups changes in the particles were analyzed by FTIR *** results showed that HVEF treatment intensity play a remarkable role in properties of *** particleboard with higher electrostatic field intensities treatment has higher MOE,MOR,IB,and *** HVEF treatment(60 kv),the MOR,modulus of MOE,and IB of three-layer particleboard were 23.61 N/mm^(2),2787.09 N/mm^(2),and 0.86 N/mm^(2),*** indicated that the surface activity of wood particles was increased electric field treatment.

关键词： High voltage electric field three-layer particleboard physical property mechanical property

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Steam Exploded Peanut Shell Fiber as the Filler in the Rigid Polyurethane Foams

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Journal of Renewable Materials 2019年第11期7卷 1077-1091页

作者： Zehui Ju Qian He Tianyi Zhan Haiyang Zhang Lin Sun lu Hong Xinyi Shi xiaoning lu College of Materials Science and Engineering Nanjing Forestry UniversityNanjing210037China College of Biology and the Environment Nanjing Forestry UniversityNanjing210037China.

In this study,steam exploded peanut shell fibers(SE-PSFs)were utilized to fabricate with rigid polyurethane foam(RPUF)in order to improve sound absorption performance and hydrothermal weather *** method of SE treatment,RPUF preparation and flame retardant treatment were selected to prepare SE-PSF/RPUF composites in this *** and mechanical properties including density,water absorption capacity,thickness swelling rate,compressive strength,thermal conductivity and average sound absorption coefficient of SE-PSF/RPUF were investigated and compared with the control(PRUF).The results showed that the density,water absorption capacity,thickness swelling rate and thermal conductivity showed an increasing trend with the increase of SE-PSFs *** strength of the composite material showed a downward trend with the increase of the SE-PSFs *** average sound absorption coefficient of the SE-PSFs/RPUF compared with PRUF significant increased,and the average sound absorption coefficient of the SE-PSFs/RPUF with SE-PSFs 40%was *** study getted the best ratio of flame retardants for 10%EG and 3%*** oxygen index was 35.56 vol%.

关键词： Steam explosion peanut shell fiber polyurethane composite flame retardant properties

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