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Black Locust Transpiration Responses to Soil Water Availability as Affected by Meteorological Factors and Soil Texture

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Pedosphere 2015年第1期25卷 57-71页

作者： wu yuan-zhi HUANG Ming-Bin David N.WARRINGTON Shandong Provincial Key Laboratory of Water and Soil Conservation and Environmental Protection Linyi University State Key Laboratory of Soil Erosion and Dryland Farming on the Loess Plateau Institute of Soil and Water Conservation Northwest A&F University

On the Loess Plateau of China, a dry soil layer may form due to excess transpiration, leading to degradation of black locust(Robinia pseudoacacia) stands. In order to better manage projects involving black locust, this study was intended to investigate the response of black locust transpiration rate to soil water availability as affected by meteorological factors using two representative soils(loamy clay and sandy loam) on the Loess Plateau. Four soil water contents were maintained for black locust seedlings grown in pots initially outdoors and then in a climate-controlled chamber, by either drying or irrigating the pots. In both environments, daily transpiration rates were related by a power function to air temperature and by a logistic function to reference evapotranspiration(ET0). Transpiration rates were more susceptible to changes in the meteorological conditions in the sandy loam than in the loamy clay soil. The transpiration rate in the well-watered treatment was greater for black locust grown in the sandy loam than in the loamy clay soil. Normalized transpiration rates were unaffected by ET0 until a critical value of soil water content(θc) was attained; the θc value decreased significantly for the loamy clay soil but increased significantly for the sandy loam soil when ET0 increased. These suggested that the effect of the meteorological condition on the transpiration characteristics of black locust was dependent on soil texture.

关键词： dry soil layer evaporative demand loamy clay Loess Plateau reference evapotranspiration sandy loam temperature vapor pressure deficit

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Experiment Study of the Evolution of Coral Sand Particle Clouds in Water

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China Ocean Engineering 2022年第5期36卷 720-733页

作者： CHEN Jie YAO Zhen JIANG Chang-bo wu zhi-yuan DENG Bin LONG yuan-nan BIAN Cheng School of Hydraulic and Environmental Engineering Changsha University of Science&TechnologyChangsha 410114China Key Laboratory of Dongting Lake Aquatic Eco-Environmental Control and Restoration of Hunan Province Changsha 410114China Key Laboratory of Water-Sediment Sciences and Water Disaster Prevention of Hunan Province Changsha 410114China

The motion of particle clouds(i.e.,sediment clouds)usually can be found in engineering applications such as wastewater discharge,land reclamation,and marine bed *** this paper,a series of laboratory tests are conducted on coral sand to investigate the shape feature of the single particle and the mixing processes of the coral sand particle *** shape of coral sand particle is measured and *** experimental results demonstrate that the shape of coral sand particles tends to be spherical as the particle size decreases,and empirical equations were established to explain the variation of D50 and fS,50 of coral *** with the silica sand,the evolution of the coral sand particle cloud still experiences three stages,but the threshold for the Reynolds number of particle clouds entering the next stage ***,the normalized axial distance of the coral sand particle clouds is 58%*** frontal velocity exhibits similar varying tendency for the coral sand particle *** the difference in shape between coral sand particles and silica sand particles,a semi-empirical formula was proposed based on the original silica sand prediction formula by adding the shape factor and the experimental data of 122μm≤D_(50)≤842μ*** can predict the frontal velocity of the coral sand particle clouds.

关键词： coral sand dredged material particle clouds thermal particle shape sediment disposal

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Responses of Different Physiological Indices for Maize(Zea mays) to Soil Water Availability

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Pedosphere 2011年第5期21卷 639-649页

作者： wu yuan-zhi HUANG Ming-Bin D. N. WARRINGTON State Key Laboratory of Soil Erosion and Dryland Farming on the Loess Plateau Institute of Soil and Water Conservation Chinese Academy of Sciences and Ministry of Water Resources Yangling 712100 (China) Shandong Provincial Key Laboratory of Soil Conservation and Environmental Protection School of Chemistry and Resources Environment Linyi University Linyi 276005 (China) Graduate University of Chinese Academy of Sciences Beijing 100049 (China) Northwest A&F University Yangling 712100 (China)

Knowledge of plant responses to soil water availability is essential for the development of effcient irrigation ***,notably different results have been obtained in the past on the responses of various physiological indices for different plants to soil water *** this study,the responses of various plant processes to soil water availability were compared with data from pot and field plot experiments conducted on maize(Zea mays L.).Consistent results were obtained between pot and field plot experiments for the responses of various relative plant indices to changes in the fraction of available soil water(FASW).A threshold value,where the relative plant indices began to decrease with soil drying,and a lower water limit,where the decline of relative plant indices changed to a very slow rate,were *** demand not only influenced the transpiration rate over a daily scale but also determined the difference in transpirational response to soil water availability among the transient,daily and seasonal time *** the seasonal scale,cumulative transpiration decreased linearly with soil drying,but the decrease of transpiration from FASW = 1 in response to water deficits did not affect dry weight until FASW = *** the other hand,the decrease in dry weight was comparable with plant height and leaf ***,the plant responses to soil water availability were notably different among various plant indices of maize and were influenced by the weather conditions.

关键词： dry weight evaporative demand fraction of available soil water plant growth transpiration

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Laser cladding of Ni-based alloy on stainless steel

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中国有色金属学会会刊：英文版 2004年第z1期14卷 296-300页

作者： XUE Chun-fang TIAN Xin-li TAN Yong-sheng wu zhi-yuan Department of Mechanical Engineering Academy of Armored Force Engineering Beijing 100072 China Department of Mechanical Engineering Academy of Armored Force Engineering Beijing 100072 China Key Laboratory for High Energy Density Beam Processing TechnologyGeneral Company of Aeronautics Industry Beijing 100024 China Department of Mechanical Engineering Academy of Armored Force Engineering Beijing 100072 China

The coatings on a stainless steel substrate were conducted by laser cladding of Ni-based alloy, using a 5 kW continuous wave CO2 flow transverse laser. SEM, EDX and X-ray diffraction were used to analyze the microstructure and constituent phases of the obtained coatings by laser cladding with direct injection of the powder into the melt pool. Solidification planar, cellular and dendrite structures were observed in Ni-based alloy coating. There exists an optimum metallurgical bond between Ni-based laser cladding layer and the base material. The high hardness of the Ni-based alloy coating is attributed to the presence of M7C3-type carbides (essentially chromium-riched carbide) dispersed in the γ(Ni,Fe) phase matrix.

关键词： laser cladding Ni-based alloy microstructure

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Numerical Study on Heat Transfer Characteristic of the Plate-Fin Microchannel Heat Sink for Water-Based Thermal Management of CPU Chip

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Energy Engineering 2022年第4期119卷 1327-1339页

作者： Jie-Chao Chen Rui-Hao Luo wu-zhi yuan Nan-Long Hong Wen-HaoWang Guangdong Provincial Key Laboratory of Distributed Energy Systems Guangdong Provincial Engineering Research Center of Distributed Energy SystemsDongguan University of TechnologyDongguan523808China

For effective water-based thermal management of high heat generating CPU chip,a series of numerical simulation has been conducted to study the effects of heat flux,fin height and flow rate on convective thermal performance of the plate-fin microchannel heat *** characteristics of heat transfer and flow resistance have been quantificationally discussed and JF factor is employed to evaluate the comprehensive efficiency of convective heat transfer of microchannel heat *** show that the increase in fin height and flow rate of cooling water is helpful to decrease the maximum temperature of CPU *** flow rate and heat flux and short fin height are benefit to improve Nusselt number Nu,but they lead to large resistance coefficient fRe *** of JF factor shows that the microchannel with short fins shows better convective thermal performance when the thermal power of the CPU chip is *** fins should be heightened when the CPU is operating at higher thermal *** employment of JF factor in the present work shows its pertinence and convenience in the application of design of microchannel heat sink.

关键词： JF factor convective thermal performance numerical simulation thermal management of CPU

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Typhoon-Induced Ocean Waves and Stokes Drift:A Case Study of Typhoon Mangkhut(2018)

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China Ocean Engineering 2024年第4期38卷 711-724页

作者： wu zhi-yuan GAO Kai CHEN Jie ZHANG Hao-jian DENG Bin JIANG Chang-bo LIU Yi-zhuang LYU Zhao YAN Ren School of Hydraulic and Environmental Engineering Changsha University of Science&TechnologyChangsha 410114China Key Laboratory of Water-Sediment Sciences and Water Disaster Prevention of Hunan Province Changsha 410114China State Key Laboratory of Hydrology-Water Resources and Hydraulic Engineering Hohai UniversityNanjing 210024China State Key Laboratory of Coastal and Offshore Engineering Dalian University of TechnologyDalian 116024China School of Civil Engineering Hunan University of TechnologyZhuzhou 412007China

Ocean waves and Stokes drift are generated by *** study investigated the characteristics of ocean waves and wave-induced Stokes drift and their effects during Typhoon Mangkhut using European Centre for MediumRange Weather Forecasts(ECMWF)ERA5 datasets and observational *** results revealed that the typhoon generated intense cyclones and huge typhoon waves with a maximum wind speed of 45 m/s,a minimum pressure of955 h Pa,and a maximum significant wave height of 12 *** Stokes drift caused by typhoon waves exceeded 0.6m/s,the Stokes depth scale exceeded 18 m,and the maximum Stokes transport reached 6 m^(2)/*** spatial distribution of 10-m wind speed,typhoon wave height,Stokes drift,Stokes depth,and Stokes transport during the typhoon was highly correlated with the typhoon *** distribution along the typhoon track showed significant zonal asymmetry,with greater intensity on the right side of the typhoon track than on the left *** findings provide important insights into the impact of typhoons on ocean waves and Stokes drift,thus improving our understanding of the interactions between typhoons and the ocean *** study also investigated the contribution of Stokes transport to the total net transport during typhoons using Ekman-Stokes Numbers as a comparative *** results indicated that the ratio of Stokes transport to the total net transport reached up to 50%within the typhoon radius,while it was approximately 30%outside the *** Stokes transport induced by typhoon waves led to divergence in the transport direction,which resulted in upwelling of the lower ocean as a compensation ***,Stokes transport played a crucial role in the vertical mixing of the ocean during *** findings suggested that Stokes transport should be paid more attention to,particularly in high latitude ocean regions,where strong winds can amplify its effects.

关键词： Stokes drift typhoon waves Ekman-Stokes transport vertical mixing Typhoon Mangkhut

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Materials for neuro-transplantation and the amnion

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Chinese Medical Journal 2006年第16期119卷 1323-1326页

作者： wu zhi-yuan HUI Guo-zhen Department of Neurosurgery First Affiliated Hospital of SoochowUniversity Suzhou 215006 China

Though tens thousands of people are suffering from spinal cord injury （the majority are young people）, effective treatments are rare. To patients doctors may say ＂we have done our best, let＇s wait and see if some miracle will happen.＂ It is glad that decades＇ researches have shed some light on the mechanism of spinal cord damage and identified several targets for intervention. The successful transplants in mammal animals in particular get our hopes up for the repair of human spinal cord injury.

关键词：传能线密度创伤神经系统脊髓经皮神经电刺激神经系统生物相容性材料羊膜移植物动物人类

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Transplantation of human amniotic epithelial cells improves hindlimb function in rats with spinal cord injury

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Chinese Medical Journal 2006年第24期119卷 2101-2107页

作者： wu zhi-yuan HUI Guo-zhen LU Yi wu Xin GUO Li-he Department of Neurosurgery First Aff＇diated Hospital of Soochow University Suzhou 215006 China Institute of Biochemistry and Cell Biology Shanghai Institute for Biological Sciences Chinese Academy of Sciences Shanghai 200031 China Shanghai Celstar Institute of Biotechnology Shanghai 201203China

Background Human amniotic epithelial cells （HAECs）, which have several characteristics similar to stem cells, therefore could possibly be used in cell therapy without creating legal or ethical problems. In this study, we transplanted HEACs into the injured spinal cord of rats to investigate if the cells can improve the rats＇ hindlimb motor function. Methods HAECs were obtained from a piece of fresh amnion, labeled with Hoechst33342, and transplanted into the site of complete midthoracic spinal transections in adult rats. The rats （n=21） were randomly divided into three groups： Sham-operation group （n=7）, cells-graft group （n=7）, and PBS group （n=7）. One rat of each group was killed for histological analysis at the second week after the transplantation. The other six rats of each group were killed for histological analysis after an 8-week behavioral testing. Hindlimb motor function was assessed by using the open-field BBB scoring system. Survival rate of the graft cells was observed at second and eighth weeks after the transplantation. We also detected the myelin sheath fibers around the lesions and the size of the axotomized red nucleus. A one-way ANOVA was used to compare the means among the groups. The significance level was set at P〈0.05. Results The graft HAECs survived for a long time （8 weeks） and integrated into the host spinal cord without immune rejection. Compared with the control group, HAECs can promote the regeneration and sprouting of the axons, improve the hindlimb motor function of the rats （BBB score： cells-graft group 9.0 ± 0.89 vs PBS group 3.7± 1.03, P〈0.01）, and inhibit the atrophy of axotomized red nucleus [cells-graft group （526.47±148.42）μm^2 vs PBS group （473.69±164.73） μm^2, P〈0.01]. Conclusion Transplantation of HAECs can improve the hindlimb motor function of rats with spinal cord injury.

关键词： spinal cord injury human amniotic epithelial cells transplantation

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Treatment of traumatic brain injury in rats with transplantation of human amniotic cells

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Chinese Medical Journal 2006年第21期119卷 1843-1845页

作者： LU Yi HUI Guo-zhen wu zhi-yuan GUO Li-he JI Xun-he wu Xin Department of Neurosurgery First Affiliated Hospital of Soochow University Suzhou 215006 China Institute of Biochemistry and Cell Biology Shanghai Institutes of Biological Sciences Chinese Academy of Sciences Shanghai 200031 China

Traumatic brain injury （TBI）, which is an important reason of human mortality and morbidity in industrialized countries, still cannot be treated effectively. Since the self-repair capacity of brain is limited, cellular transplantation in TBI may be a therapeutic *** amniotic cells （HACs） from fertilized ovum are able to differentiate into all the tissues of the body. They can not only express the markers of neuronal and glial cells^1 but also synthesize and release the neurotrophic factors.^2 Moreover, transplanted HACs rarely induce immunologic rejection.^3,4 In this study, we investigated whether HAC cultures conditioned by traumatic brain tissue extracts can acquire the phenotype of neuron, and examined the effects of transplanted HACs on the affected hindlimb of rats with TBI.

关键词： brain injuries amnion transplantation rats

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技术与后现代语用学——利奥塔技术思想述评

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自然辩证法研究 2008年第6期24卷 43-48页

作者：吴致远广西民族大学科学技术与社会发展研究中心南宁530006

现代性的话语以"元叙事"为其特征,技术乌托邦主义即是现代性的"元叙事"之一。在"元叙事"的理想下现代技术的发展具有了很大程度上的非反思性和盲目性。技术的现代发展确立了科学知识的合法性基础,而信息技术的新进展又为后现代语用学提... 详细信息

现代性的话语以"元叙事"为其特征,技术乌托邦主义即是现代性的"元叙事"之一。在"元叙事"的理想下现代技术的发展具有了很大程度上的非反思性和盲目性。技术的现代发展确立了科学知识的合法性基础,而信息技术的新进展又为后现代语用学提供了可能。

关键词：技术元叙事后现代语用学

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