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| 1 | Ecological environment quality evaluation of the Sahel region in Africa based on remote sensing ecological index显示文摘Long-term monitoring of the ecological environment changes is helpful for the protection of the ecological environment.Based on the ecological environment of the Sahel region in Africa,we established a remote sensing ecological index(RSEI)model for this region by combining dryness,moisture,greenness,and desertification indicators.Using the Moderate-resolution Imaging Spectroradiometer(MODIS)data in Google Earth Engine(GEE)platform,this study analyzed the ecological environment quality of the Sahel region during the period of 2001-2020.We used liner regression and fluctuation analysis methods to study the trend and fluctuation of RSEI,and utilized the stepwise regression approach to analyze the contribution of each indicator to the RSEI.Further,the correlation analysis was used to analyze the correlation between RSEI and precipitation,and Hurst index was applied to evaluate the change trend of RSEI in the future.The results show that RSEI of the Sahel region exhibited spatial heterogeneity.Specifically,it exhibited a decrease in gradient from south to north of the Sahel region.Moreover,RSEI in parts of the Sahel region presented non-zonal features.Different land-cover types demonstrated different RSEI values and changing trends.We found that RSEI and precipitation were positively correlated,suggesting that precipitation is the controlling factor of RSEI.The areas where RSEI values presented an increasing trend were slightly less than the areas where RSEI values presented a decreasing trend.In the Sahel region,the areas with the ecological environment characterized by continuous deterioration and continuous improvement accounted for 44.02%and 28.29%of the total study area,respectively,and the areas in which the ecological environment was changing from improvement to deterioration and from deterioration to improvement accounted for 12.42%and 15.26%of the whole area,respectively.In the face of the current ecological environment and future change trends of RSEI in the Sahel region,the research results provide a reference for the construction of the'Green Great Wall'(GGW)ecological environment project in Africa. | WU Shupu GAO Xin LEI Jiaqiang ZHOU Na GUO Zengkun SHANG Baijun | 2022 | Journal of Arid Land2022，14，1： | 8 |
| 2 | 鸡马立克氏病病毒逃逸宿主天然免疫的利器:致瘤蛋白Meq显示文摘鸡马立克氏病病毒(MDV)是一种重要的禽类致瘤性疱疹病毒,在鸡群中极为常见。该病毒引发的鸡马立克氏病每年在全世界范围内给养禽业造成巨大经济损失,是养禽业的一个主要威胁。MDV感染鸡后可以引发严重的肿瘤,同时使感染鸡对其他细菌和病毒的抵抗力降低,造成其他细菌和病毒继发感染。在机体发生肿瘤和继发感染的作用下,鸡群死亡率显著升高。 | Li Kai Liu Yongzhen Xu Zengkun | 2019 | 中国预防兽医学报2019，41，11： | 7 |
| 3 | An improved procedure for manufacture of 3D tubes with springback concerned in flexible bending process显示文摘Three dimensional(3D)tubes,which possess the characteristics of space saving,lightweight and high strength,are widely used in many high-end industries such as aviation,aerospace,automobile and shipbuilding.However,when manufacturing a 3D tube in flexible bending process,springback is a big obstacle for improving the forming quality.In this paper,a new comprehensive strategy for springback control of 3D tubes is proposed.The strategy can be described as follows:(1)define the desired shape and manufacture shape;(2)optimize the manufacture shape using two tooling design methods(e.g.DA(displacement adjustment)method and B&T(bending and twisting)method presented in this paper);(3)make a discretization of the manufacture shape to acquire the optimized forming parameters.Additionally,experiment is implemented to validate the effectiveness of the new strategy.Results show that forming parameters acquired by the new strategy are partially effective.The new strategy also demonstrates that,during 3D tubes forming,the deviation caused by over-bent elements can be counteracted by the deficient-bent elements.This principle is helpful to reduce the difficulty of parameter determination in future. | Jianjun WU Zengkun ZHANG | 2021 | Chinese Journal of Aeronautics2021，34，11： | 6 |
| 4 | Duality in Nonlinear Fractional Programming显示文摘 | Xu Zengkun | 1992 | Math Anal and Appl1992，169，1： | 1 |
| 5 | Constraint qualifications in a class of nondifferentiable mathematical programming problems显示文摘 | Xu Zengkun | 2005 | Journal Mathematical Analysis and Applications2005，302，2： | 1 |
| 6 | Note on Characterizations of Prequasi-Invex Functions显示文摘 | LuoHezhi Xu Zengkun | 2004 | Optim Theory Appl2004，120，2： | 1 |
| 7 | Correlation of solubilities of hydrophilic pharmaceuticals versus dielectric constants of binary solvents 显示文摘 | ZHANG Xinwei YIN Qiuxiang LIU Zengkun | 2012 | Ind Eng Chem Res2012，51，19： | 1 |
| 8 | A General form of Alzer' s inequality 显示文摘 | Xu Zengkun | 2002 | Computers & Mathematics with Applications2002，，44： | 1 |
| 9 | Measurement and correlation of the solubility of 4,4'- oxydianiline in different organic solvents 显示文摘 | LIU Zengkun YIN Qiuxiang ZHANG Xinwei | 2013 | Fluid Phase Equilibria2013，356，： | 1 |
| 10 | Duality in generalized nonlinear fractional programming显示文摘 | Xu Zengkun | 1992 | J of Mathematical Analysis and Application1992，169，1： | 1 |
| 11 | Constraint qualifications in a class of nondifferentiable mathematical programming problems显示文摘 | Xu Zengkun | 2005 | J Math Amal Appl2005，302，2： | 1 |
| 12 | Studies on the morphological,rheological,electrical,mechanical and thermal properties of the PTT/SCF composites显示文摘 | Mingtao Run Xin Li Hongzan Song Zengkun Wang | | 0，，： | 1 |
| 13 | Mixed type duality in multiobjective programming problems显示文摘 | | 1996 | Journal of Mathematical Analysis and Applications1996，198，： | 1 |
| 14 | Saddle-point type optimality criteria for generalized fractional programming显示文摘 | Xu Zengkun | 1998 | J Optim Theory Appl1998，57，： | 1 |
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