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| 1 | Review of the uncertainty analysis of groundwater numerical simulation显示文摘Groundwater system is a complex and open system, which is affected by natural conditions and human activities. Natural hydrological processes is conceptualized through relatively simple flow governing equations in groundwater models. Moreover, observation data is always limited in field hydrogeological conditions. Therefore, the predictive results of groundwater simulation often deviate from true values, which is attribute to the uncertainty of groundwater numerical simulation. According to the process of system simulation, the uncertainty sources of groundwater numerical simulation can be divided into model parameters, conceptual model and observation data uncertainties. In addition, the uncertainty stemmed from boundary conditions is sometimes refered as scenario uncertainty. In this paper, the origination and category of groundwater modeling uncertainty are analyzed. The recent progresses on the methods of groundwater modeling uncertainty analysis are reivewed. Furthermore, the researches on the comprehensive analysis of uncertainty sources, and the predictive uncertainty of model outputs are discussed. Finally, several prospects on the deveolpment of groundwater modeling uncetainty analysis are proposed. | WU JiChun ZENG XianKui | 2013 | Chinese Science Bulletin2013，58，25： | 24 |
| 2 | Variations in fine root dynamics and turnover rates in five forest types in northeastern China显示文摘Quantifying fi ne root(≤ 2.0 mm in diameter) distribution and turnover is essential for accurately estimating forest carbon budgets. However, fi ne root dynamics are poorly understood, possibly because of their inaccessibility. This study quantifi es fi ne root distribution and turnover rates for fi ve representative Chinese temperate forests types. Fine root number, diameter, biomass, necromass, production, mortality, and turnover rates were measured using a minirhizotron over a 12-month period. More than 90% of the fi ne roots were < 0.5 mm in diameter, with thin fi ne roots at shallow layers, and thicker ones in deeper soil layers. The fi ne root dynamics were signifi cantly diff erent among the forest types. Coniferous plantations had fewer fi ne roots, less biomass, necromass, production and mortality but greater average diameters than fi ne roots of broadleaved forests. All traits, except for diameter, decreased along the soil profi le. Fine root numbers and production exhibited a unimodal seasonal pattern with peaks occurring in summer, whereas biomass, necromass and mortality progressivelyincreased over the growing season. The turnover rates of roots < 0.5 mm varied from 0.4 to 1.0 a-1 for the fi ve forest types, 0.5–1.0 a-1 for the soil layers and 0.2–1.1 a-1 for the seasons, with the largest turnover rate at the 0–10 cm depth in summer. The patterns of fi ne root numbers, biomass, necromass, production, mortality, and turnover rates varied with forest types, soil depths, growing season and diameter classes. This study highlights the importance of forest types and diameters in quantifying fi ne root turnover rates. | Nan Wang Chuankuan Wang Xiankui Quan | 2020 | Journal of Forestry Research2020，31，3： | 3 |
| 3 | RESEARCH ON THE ON-LINE MEASURING SYSTEM FOR THE MIDDLE-CONVEX AND VARYING ELLIPSE PISTON SKIRT显示文摘The middle convex and varying ellipse piston is th e key component of an internal combustion engine In general,the piston is mac hined by non circular section CNC lathe,but the measuring of piston profile is manipulated by off line Because the off line measuring reference is differen t from the machining reference,the measurement result is diverse from the act ual dimension A new method to measure the middle convex and varying ellipse p iston profile, which is known as on line measuring, is presented By using thi s kind of method,the high measurement accuracy can be gained,as well as meeting the production requirement. | Wang Xiankui,Jiang Simin,Qian Lei,Shi Zhongdong,Wu Dan (Department of the Precision Instrument and Mechanics,Qinghua University) | 2001 | Chinese Journal of Mechanical Engineering2001，14，4： | 1 |
| 4 | EDM dressing of fine grain super abrasive grinding wheel显示文摘 | Wang Xiankui Ying Baoge Liu Weigang | 1996 | Journal of Materials Processing Technology1996，2，4： | 1 |
| 5 | A general model for m- achinable features and its application to machinability evalua tion of mechanical parts显示文摘 | CHEN Li PU Jian WANG Xiankui | 2002 | Computer-Aided Design2002，34，3： | 1 |
| 6 | Tracking Control and Active Disturbance Rejection with Application to Noncircular Machining显示文摘 | Wu Dan Chen Ken Wang Xiankui | | 0，，15： | 1 |
| 7 | Sol-gelderived corrosion-pretection coatings 显示文摘 | Dave Bakul Hu Xiankui Devaraj Y ogeeswari ? et oi | 2004 | Journal of Sol-Gel Science and Technology2004，，14： | 1 |
| 8 | Influence of yield to tensile strength ratio on failure assessment of corroded pipeline 显示文摘 | ZHU Xiankui Brian N Leis | 2005 | Journal of pressure vessel technology2005，127，： | 1 |
| 9 | Extracted control approach for CNC non-circular turning显示文摘 | Zhou Huixing Brian H Wang Xiankui | 2005 | Asian Journal of Control2005，7，3： | 1 |
| 10 | A Novel Transcription Factor, T-bet, Directs Th1 Lineage Commitment显示文摘 | Susanne J Szabo Sean T Kim Gina L Costa Xiankui Zhang C.Garrison Fathman Laurie H Glimcher | 2000 | Cell2000，，6： | 1 |
| 11 | Review of fracture toughness (G, K, J, CTOD, CTOA) testing and standardization显示文摘 | Zhu Xiankui James A Joyce | 2012 | Engineering Fracture Mechanics2012，85，： | 1 |
| 12 | Research on manufacturing resource modeling based on the O-O method 显示文摘 | Liu Chengying Wang Xiankui He Yuchen | 2003 | Journal of Materials Processing Technolgy2003，139，2003： | 1 |
| 13 | Sol–Gel-Derived Corrosion-Protection Coatings显示文摘 | Bakul C. Dave Xiankui Hu Yogeeswari Devaraj Shirshak K. Dhali | 2004 | Journal of Sol - Gel Science and Technology (-)2004，，1： | 1 |
| 14 | A general model for machinable features and its application to ma- ehinability evaluation of mechanical parts显示文摘 | Chen Li Pu Jian Wang Xiankui | 2002 | Com- puter-Aided Design2002，34，3： | 1 |
| 15 | Theoretical and Numerical Predications of Burst Pressure of Pipelines 显示文摘 | ZHU Xiankui BRIAN N L | 2007 | Journal of Pressure Vessel Technology2007，129，11： | 1 |
| 16 | Research on manufacturing resource modeling based on the 0-0 method显示文摘 | LIU Chengying WANG Xiankui HE Yuchen | 2003 | Journal of Materials Processing Technology2003，139，13： | 1 |
| 17 | Research on Manufacturing Resource Modeling Based on the O-O Method显示文摘 | Chengying L W Xiankui | 2003 | Journal of Materials Processing Technology2003，139，1： | 1 |
| 18 | CAPP fram-tool system based on component reconfiguration显示文摘 | WEI Zhiqiang WANG Xiankui | 2000 | Jour of Tsinghua Univ(Sci& Tech)2000，40，8： | 1 |
| 19 | Carbon concentration variability of 10 Chinese temperate tree species显示文摘 | Quanzhi Zhang Chuankuan Wang Xingchang Wang Xiankui Quan | 2009 | Forest Ecology and Management2009，，5： | 1 |
| 20 | 颜色和物候表明46种温带落叶木本植物衰老叶片的养分变异显示文摘不同共生植物的叶片养分含量差异显著,反映了不同的叶片养分利用策略。然而,衰老叶片养分的种间变异及其驱动因素尚不清楚。本研究旨在探讨衰老叶片养分的种间变异及其驱动因素。我们在中国东北的帽儿山森林生态系统研究站测定了46种共存温带落叶木本植物新鲜落叶的碳、氮、磷浓度。采用随机森林模型量化10个生物因素(菌根类型、固氮类型、生长形态、耐阴性、叶片质地、变色程度、变色类型、叶片变色峰期、落叶峰期和落叶末期)的相对重要性。研究结果表明,落叶氮浓度种间变化为4倍,磷浓度变化达9倍。较高的氮和磷平均浓度(15.38和1.24 mg·g^(−1))表明该森林氮和磷限制较弱。功能群仅对特定养分及其比值有显著影响。磷浓度、氮磷比与外生菌根树种的落叶高峰日和落叶结束日呈负相关。颜色鲜艳的叶片(红色>棕色>黄色>黄绿色>绿色)倾向于比绿色叶片氮和磷浓度更低而碳氮比和碳磷比较高。随机森林模型表明,秋季叶变色和落叶物候贡献了80%的种间变异解释量。这些结果增加了我们对温带森林木本植物营养策略之衰老叶片养分变异性的理解。 | Xingchang Wang Qi Wang Yue Chen Rui Zhao Jiahui Zhang Xiankui Quan Fan Liu Chuankuan Wang | 2022 | Journal of Plant Ecology2022，15，4： | 1 |
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