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| 1 | On a class of weak Landsberg metrics显示文摘In this paper, we discuss a class of Finsler metrics defined by a Riemannian metric and a 1-form on a manifold. We characterize weak Landsberg metrics in this class and show that there exist weak Landsberg metrics which are not Landsberg metrics in dimension greater than two. | Ben-ling LI & Zhong-min SHEN Department of Mathematics, Zhejiang University, Hangzhou 310028, China Department of Mathematical Sciences, Indiana University Purdue University Indianapolis (IUPUI), 402 N. Blackford Street, Indianapolis, IN 46202-3216, USA Center of Mathematical Sciences, Zhejiang University, Hangzhou 310027, China | 2007 | Science China Mathematics2007，50，4： | 14 |
| 2 | The roles of a decision support system in applying forest ecosystem management in Northeast China显示文摘Forest ecosystems provide a variety of services and forest ecosystem management (FEM) is an effective approach to maximize the services. Because of the complexity of forest ecosystems, the applications of FEM can be facilitated with decision support systems (DSS) that recognize and incorporate ecological and socio-economic variables. With the rapid development of computation and information technologies, DSS have been advanced in many ways. Traditional forest management within a forestry unit in China is planned on a yearly basis. The planning itself remains primarily a verbal concept as there are no quantitative decision-support tools available to translate the concept into forest management actions. For the purposes of FEM at the management level, a forest management DFF, FORESTAR(R), has been developed under a framework of geographic information system (GIS) and forest models. The paper explained the intelligent modeling mechanisms and demonstrated how the applications of FEM can be strengthened with the applications of FORESTAR(R). | DAI Limin, ZHENG Bofu, Guofan Shao & ZHOU Li State Key Lab of Systems Ecology, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, China Institute of Applied Ecology, Chinese Academy of Sciences, Shenyang 110016, China Department of Forestry and Natural Resources, Purdue University, West Lafayette, IN 47907, USA Graduate University of Chinese Academy of Sciences, Beijing 100101, China | 2006 | Science China(Technological Sciences)2006，49，z1： | 9 |
| 3 | Digitally determining forest inventory units with an ecological classification system显示文摘Management-level forest resource data in China were obtained with a combination of two forest inventories. However, inconsistencies in the spatial attributes of forest data vary between the two inventory types and between two inventories of the same type. The inconsistencies make it inconvenient for long-term forest management planning with digital technologies. Ecological Land Types (ELTs) and Ecological Land Type Phases (ELTPs) have been mapped in selected forestry regions in northeast China, where important forest industries are located. The boundaries of ELTs are determined by geomorphic conditions, which are quantified by Digital Elevation Models (DEM); ELTPs are classified by overlaying ELTs with forest vegetation data layers that are obtained with both remotely sensed and ground data. The ELTPs represent the divisions of land in terms of both natural and human-induced forest conditions, and therefore they are reliable units for forest inventories and management. This paper introduces a case study for digitally determining forest inventory units in Benxi City, Liaoning Province, northeast China. The general objective of the study was to explain how a compatible forest inventory system should be designed and why the compatible forest inventory system was significant to digital forestry in China. | TANG Una, WANG Qingli, Guofan Shao, DAI Limin, WANG Shunzhong, LI Xiufen & XU Dong Institute of Applied Ecology, Chinese Academy of Sciences, Shenyang 110016, China Graduate University of Chinese Academy of Sciences, Beijing 100101, China Department of Forestry and Natural Resources, Purdue University, West Lafayette, IN 47907, USA | 2006 | Science China(Technological Sciences)2006，49，z1： | 6 |
| 4 | A density-dependent matrix model and its applications in optimizing harvest schemes显示文摘Based on temporal data collected from 36 re-measured plots, transition probabilities of trees from a diameter class to a higher class were analyzed for the broadleaved-Korean pine forest in the Changbai Mountains. It was found that the transition probabilities were related not only to diameter size but also to the total basal area of trees with the diameter class. This paper demonstrates the development of a density-dependent matrix model, DM2, and a series of simulations with it for forest stands with different conditions under different harvest schemes. After validations with independent field data, this model proved a suitable tool for optimization analysis of harvest schemes on computers. The optimum harvest scheme(s) can be determined by referring to stand growth, total timbers harvested, and size diversity changes over time. Three user-friendly interfaces were built with a forest management decision support system FORESTAR(R) for easy operations of DM2 by forest managers. This paper also summarizes the advantages and disadvantages of DM2. | Guofan Shao, WANG Fei, DAI Limin, BAI Jianwei & LI Yingshan Department of Forestry and Natural Resources, Purdue University, West Lafayette, IN 47907, USA Institute of Applied Ecology, Chinese Academy of Sciences, Shenyang 110016, China Inner Mongolia Agriculture University, Hohhot 010019, China Academy of Forest Inventory and Planning, State Forestry Administration, Beijing 100714, China | 2006 | Science China(Technological Sciences)2006，49，z1： | 4 |
| 5 | Mapping forest fire risk zones with spatial data and principal component analysis显示文摘By integrating forest inventory data with remotely sensed data, new data layers for factors that affect forest fire potentials were generated for Baihe Forestry Bureau in Jilin Province of China. The principle component analysis was used to sort out the relationships between forest fire potentials and environmental factors. The classifications of these factors were performed with GIS, generating three maps: a fuel-based fire risk map, a topography-based fire risk map, and an anthropogenic-factor fire risk map. These three maps were then synthesized to generate the final fire risk map. The linear regression method was used to analyze the relationship between an area-weighted value of forest fire risks and the frequency of historical forest fires at each forest farm. The results showed that the most important factor contributing to forest fire ignition was topography, followed by anthropogenic factors. | XU Dong, Guofan Shao, DAI Limin, HAO Zhanqing, TANG Lei & WANG Hui Institute of Applied Ecology, Chinese Academy of Sciences, Shenyang 110016, China Graduate University of Chinese Academy of Sciences, Beijing 100039, China Department of Forestry and Natural Resources, Purdue University, West Lafayette, IN 47907, USA Department of Management, Shenyang Institute of Aeronautical Engineering, Shenyang 110034, China Department of City Development, Jinan University, Jinan 250002, China | 2006 | Science China(Technological Sciences)2006，49，z1： | 3 |
| 6 | Quantifying soil erosion with GIS-based RUSLE under different forest management options in Jianchang Forest Farm显示文摘Quantitatively estimating soil erosion with an integration of geographic information system (GIS) and the revised universal soil loss equation (RUSLE) under four different exposed soil proportion scenarios caused by forest management practices was studied at Jianchang Forest Farm. The GIS provided means of input data generation required by RUSLE model and allowed a spatial assessment of the erosion hazard over the study area. Four exposed soil proportion scenarios of 5%, 10%, 20% and 30% were tested with the GIS-based RUSLE model to evaluate soil erosion hazard. The predicted soil erosion potentials were classified into five categories in order to provide valuable aids for management planning. | ZHANG Hengming, WANG Qingli, DAI Limin, Guofan Shao, TANG Una, WANG Shunzhong & GU Huiyan Institute of Applied Ecology, Chinese Academy of Sciences, Shenyang 110016, China Graduate University of Chinese Academy of Sciences, Beijing 100101, China Department of Forestry and Natural Resources, Purdue University, Lafayette IN47901, USA Northeast Forestry University, Harbin 150040, China | 2006 | Science China(Technological Sciences)2006，49，z1： | 3 |
| 7 | Unified Analysis of the Hybrid Form of Mixed Finite Elements for Second Order Elliptic Problems | ZHANGXIN CHEN Department of Mathematics, Purdue University, W. Lafayette, IN 47907, U.S.A | 1991 | 工程数学学报1991，8，2： | 3 |
| 8 | 烧伤的流行病学、人口统计学及结局特点显示文摘 | John L Hunt Gary F Purdue 王劭宏(译) | 2008 | 中华损伤与修复杂志(电子版)2008，3，1： | 3 |
| 9 | Dynamic Programming for Multidimensional Stochastic Control Problems | Jin Ma Department of Mathematics,Purdue University,West Lafayette,IN 47907-1395,U S A E-mail:majin@math.purdue,eduJiongmin Yong Laboratory of Mathematics for Nonlinear Science,Department of Mathematics,and Institute of Mathematical Finance,Fudan University,Shanghai 200433,P.R.China E-mail:jyong@fudan,edu.cn | 1999 | Acta Mathematica Sinica,English Series1999，15，4： | 2 |
| 10 | Digital forestry research in China显示文摘Digital Forestry as a concept was developed after the Digital Earth program. The Chinese scientists were not only among the pioneers who first proposed the concept of Digital Forestry, but also contributed a lot to the development of Digital Forestry. Digital Forestry is a digital framework to maintain forest planting, management, using, and protect. The synergetic use of computationally-intensive quantitative methods together with information technologies is the most important foundation for the development of Digital Forestry. Under this situation, the experience of Digital Forestry development in China is relatively rich. A number of academicians, scholars, and professional administrators were involved in discussing the Digital Forestry Construction Scheme. The Project of Digital Forestry Practicability approved by the State Forestry Administration is a major instance in developing Digital Forestry standard and key techniques. By introducing a case study of Digital Forestry, this paper reviews the concept of Digital Forestry, the way turning traditional forestry into Digital Forestry, and the future development of Digital Forestry. | TANG Shouzheng, TANG Una, Guofan Shao & DAI Limin Research Institute of Resource Information Techniques, Chinese Academy of Forestry, Beijing 100091, China Institute of Applied Ecology, Chinese Academy of Sciences, Shenyang 110016, China Departmet of Forestry and Natural Resources, Purdue University, West Lafayette, IN 47907, USA Graduate University, Chinese Academy of Sciences, Beijing 100101, China | 2006 | Science China(Technological Sciences)2006，49，z1： | 2 |
| 11 | The tricks plants use to reach appropriate light显示文摘The perception of ambient light signals that produce a relevant response to ensure exposure to appropriate levels of light energy is vital for plants. In response to this, intricate molecular mechanisms to mediate light signaling have evolved in plants. Among the responses induced by light, seedling extension is a determining event for plant survival in darkness, especially in the initial stage of plant growth. Here we review previous studies and recent progress towards an understanding of light signaling that regulates seedling elongation. We focus on the three regions of the sunlight spectrum that primarily control seedling elongation, namely red/far-red light, blue/UV-A light and UV-B light, and summarize the four signaling pathways that correspond to the three effective spectra. | CHAO DaiYin1 & LIN HongXuan2 1Department of Horticulture and Landscape Architecture, Purdue University, West Lafayette, Indiana 47907, USA 2National Key Laboratory of Plant Molecular Genetics, Shanghai Institute of Plant Physiology and Ecology, Shanghai Institutes for Biological Sciences, Chinese Academy of Sciences, Shanghai 200032, China | 2010 | Science China(Life Sciences)2010，53，8： | 2 |
| 12 | Electrical injuries:a 20-year review显示文摘 | ARNOLDO B D PURDUE G F KOWALSKE K | 2004 | J Burn Care Rehabil2004，25，6： | 1 |
| 13 | Characterization and chromosomal mapping of a genomic clone encoding human alanine:glyoxylate aminotransferase显示文摘 | Purdue PE Lumb MJ Fox M | 1991 | Genomics1991，10，： | 1 |
| 14 | Impaired lung function and lung cancer incidence in a cohort of Swedish construction workers显示文摘 | Purdue Mark P Gold Laure Jarvholm Bengt | 2007 | Thorax2007，62，1： | 1 |
| 15 | Neighbourhood governance: Leadership, trust and social capital显示文摘 | Purdue D | 2001 | Urban Studies2001，38，12： | 1 |
| 16 | The cellular and molecular biology of periprosthetic esteolysis显示文摘 | Purdue PE Koulouvaris P Potter HG | | 0，，454： | 1 |
| 17 | Impaired lung function and lung cancer incidence in a cohort of swedish construction works 显示文摘 | Purdue MP Gold L Jarvholm B | 2007 | Toraz2007，62，1： | 1 |
| 18 | Polymorphisms in immune function genes and risk of non-Hodgkin lymphoma:flndings from the New South Wales non-Hodgkin Lymphoma Study 显示文摘 | Purdue M P Lan Q Krieker A | 2007 | Carei- nogenosis2007，28，3： | 1 |
| 19 | Peroxisome biogenesis显示文摘 | Purdue P E Lazarow P B | 2001 | Annu Rev Cell Dev Biol2001，17，： | 1 |
| 20 | The cellular and molec- ular biology of periprosthetic osteolysis显示文摘 | Purdue PE Koulouvaris P Potter HG | 2007 | Clin Orthop Relat Res2007，454，： | 1 |
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