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| 1 | Vegetation dynamics and its response to climate change in Central Asia显示文摘The plant ecosystems are particularly sensitive to climate change in arid and semi-arid regions. However, the responses of vegetation dynamics to climate change in Central Asia are still unclear. In this study, we used the normalized difference vegetation index(NDVI) data to analyze the spatial-temporal changes of vegetation and the correlation of vegetation and climatic variables over the period of 1982–2012 in Central Asia by using the empirical orthogonal function and least square methods. The results showed that the annual NDVI in Central Asia experienced a weak increasing trend overall during the study period. Specifically, the annual NDVI showed a significant increasing trend between1982 and 1994, and exhibited a decreasing trend since 1994. The regions where the annual NDVI decreased were mainly distributed in western Central Asia, which may be caused by the decreased precipitation. The NDVI exhibited a larger increasing trend in spring than in the other three seasons. In mountainous areas, the NDVI had a significant increasing trend at the annual and seasonal scales; further, the largest increasing trend of NDVI mainly appeared in the middle mountain belt(1,700–2,650 m asl). The annual NDVI was positively correlated with annual precipitation in Central Asia, and there was a weak negative correlation between annual NDVI and temperature. Moreover, a one-month time lag was found in the response of NDVI to temperature from June to September in Central Asia during 1982–2012. | YIN Gang HU Zengyun CHEN Xi TIYIP Tashpolat | 2016 | Journal of Arid Land2016，8，3： | 13 |
| 2 | Effects of T6 heat treatment on the microstructure, tensile properties, and fracture behavior of the modified A356 alloys显示文摘 | Man Zhu Zengyun Jian Gencang Yang Yaohe Zhou | 2011 | Materials and Design2011，，： | 2 |
| 3 | Stability analysis in a class of discrete SIRS epidemic models显示文摘 | HU Zengyun TENG Zhidong JIANG Haijun | 2012 | Nonlinear Anal- ysis: Real WorM Applications2012，13，5： | 1 |
| 4 | A Novel CoFe2NiMn0.3AlCux High-Entropy Alloy with Excellent Magnetic Properties and Good Mechanical Properties显示文摘In the present study,we investigate the crystal structure of high-entropy alloys(HEAs)in the form of CoFe2NiMn0.3AlCux(x=0.25,0.50,0.75,and 1.00)and their mechanical and magnetic properties.The CoFe2NiMn0.3AlCux alloys are composed of a mixture of a body-centered cubic(BCC)and a face-centered cubic(FCC)solid solution.The increased amounts of copper(Cu)boost both alloy strength and plastic ductility.The CoFe2 NiMn0.3AlCu1.0 HEAs demonstrate excellent mechanical properties,such as a high strength of 1832 MPa and a large plastic ductility of 22.38%.Magnetic property measurements on this alloy system indicated high saturated magnetization and high coercivity.The coercivity of the tested alloys lies in the range between 40 and 182 Oe,suggesting that the alloys have semi-hard magnetic properties.This study suggests that the present CoFe2NiMn0.3AlCux HEAs could serve as potential candidates for soft magnets in electromagnetic applications. | Man Zhu Chi Zhang Kun Li Yongqin Liu Mao Zhang Lijuan Yao Zengyun Jian | 2021 | Acta Metallurgica Sinica(English Letters)2021，34，11： | 1 |
| 5 | Kuribayashi, et al, Critical undercoolings for the transition from lateral to continuous growth in undercooled Silicon and Germanium显示文摘 | Zengyun Jian K | 2004 | Acta materilia2004，52，： | 1 |
| 6 | Theoretical Analysis and Simulation of BJFET Obstructive Characteristics显示文摘A new bipolar junction field-effect transistor (BJFET) was described. The theoretical analysis and computer simulation of BJFET obstructive characteristic are achieved. The gate bias voltage affects the BJFET obstructive voltage greatly. The BJFET obstructive characteristic is relevant to structure parameters of channel width W and channel length L. The decrease-bias-voltage operation can weaken the device obstructive characteristic. The forward turn in device forward obstructive region can also affect the BJFET obstructive characteristic. BJFET has a good high temperature obstructive characteristic and can be applying to high temperature status as high voltage switch devices. | ZENGYun YANMin YANYong-hong FANWei | 2005 | Semiconductor Photonics and Technology2005，11，1： | 1 |
| 7 | Effccts of T6 heat treatment on the microstructure, tensile properties, and fracture behavior of the modified A356 alloys 显示文摘 | Zhu Man Jian Zengyun Yang Gencang et aI | 2012 | Materials and Design2012，36，： | 1 |
| 8 | Periodic review product models with variable capacity, random yield and uncertain demand显示文摘 | WANG Zengyun YIGAL G | 1996 | Management Science1996，42，1： | 1 |
| 9 | The effects of deep-level defects on the electrical properties of Cd0.9Zn0.1Te crystals显示文摘The deep-level defects of Cd Zn Te(CZT)crystals grown by the modified vertical Bridgman(MVB)method act as trapping centers or recombination centers in the band gap,which have significant effects on its electrical properties.The resistivity and electron mobility–lifetime product of high resistivity Cd_(0.9)Zn_(0.1)Te wafer marked CZT1 and low resistivity Cd_(0.9)Zn_(0.1)Te wafer marked CZT2 were tested respectively.Their deep-level defects were identified by thermally stimulated current(TSC)spectroscopy and thermoelectric effect spectroscopy(TEES)respectively.Then the trap-related parameters were characterized by the simultaneous multiple peak analysis(SIMPA)method.The deep donor level(EDD/dominating dark current was calculated by the relationship between dark current and temperature.The Fermi-level was characterized by current–voltage measurements of temperature dependence.The width of the band gap was characterized by ultraviolet-visible-infrared transmittance spectroscopy.The results show the traps concentration and capture cross section of CZT1 are lower than CZT2,so its electron mobility–lifetime product is greater than CZT2.The Fermi-level of CZT1 is closer to the middle gap than CZT2.The degree of Fermi-level pinned by EDDof CZT1 is larger than CZT2.It can be concluded that the resistivity of CZT crystals increases as the degree of Fermi-level pinned near the middle gap by the deep donor level enlarges. | Pengfei Wang Ruihua Nan Zengyun Jian | 2017 | Journal of Semiconductors2017，38，6： | 1 |
| 10 | Synchronization analysis of delayed complex networks via adaptive time-varying coupling strengths 显示文摘 | Huang Lihong Wang Zengyun Wang Yaonan | 2009 | Physics Letters A2009，373，： | 1 |
| 11 | Synchronization analysis of networks with both delayed and non-delayed couplings via adaptive pinning control method 显示文摘 | Wang Zengyun Huang Lihong Wang Yaonan | 2010 | Commun Nonlinear Sci Nurner Simulat2010，15，12： | 1 |
| 12 | Stability a-nalysis in a class of discrete SIRS epidemic model显示文摘 | Zengyun Hu Zhidong Teng Haijun Jiang | 2012 | Nonlinear Analysis2012，13，1： | 1 |
| 13 | Reliable dissipativecontrol for uncertain time-delayed stochastic systems withMarkovian jump switching and multiplicative noise显示文摘 | Wang Zengyun Huang Lihong Zuo Yi | 2011 | AsianJournal of Control2011，13，4： | 1 |
| 14 | Stability and bifurcation analysis in a discrete SIR epidemic model 显示文摘 | HU Zengyun TENG Zhidong ZHANG Long | 2014 | Mathemat- ics and Computers in Simulation2014，97，： | 1 |
| 15 | Dynamic variations in COVID-19 with the SARS-CoV-2 Omicron variant in Kazakhstan and Pakistan显示文摘Background The ongoing coronavirus disease 2019(COVID-19)pandemic caused by the severe acute respiratory syndrome-coronavirus 2(SARS-CoV-2)and the Omicron variant presents a formidable challenge for control and prevention worldwide,especially for low-and middle-income countries(LMICs).Hence,taking Kazakhstan and Pakistan as examples,this study aims to explore COVID-19 transmission with the Omicron variant at different contact,quarantine and test rates.Methods A disease dynamic model was applied,the population was segmented,and three time stages for Omicron transmission were established:the initial outbreak,a period of stabilization,and a second outbreak.The impact of population contact,quarantine and testing on the disease are analyzed in five scenarios to analysis their impacts on the disease.Four statistical metrics are employed to quantify the model’s performance,including the correlation coefficient(CC),normalized absolute error,normalized root mean square error and distance between indices of simulation and observation(DISO).Results Our model has high performance in simulating COVID-19 transmission in Kazakhstan and Pakistan with high CC values greater than 0.9 and DISO values less than 0.5.Compared with the present measures(baseline),decreasing(increasing)the contact rates or increasing(decreasing)the quarantined rates can reduce(increase)the peak values of daily new cases and forward(delay)the peak value times(decreasing 842 and forward 2 days for Kazakhstan).The impact of the test rates on the disease are weak.When the start time of stage Ⅱ is 6 days,the daily new cases are more than 8 and 5 times the rate for Kazakhstan and Pakistan,respectively(29,573 vs.3259;7398 vs.1108).The impact of the start times of stageⅢon the disease are contradictory to those of stageⅡ.Conclusions For the two LMICs,Kazakhstan and Pakistan,stronger control and prevention measures can be more effective in combating COVID-19.Therefore,to reduce Omicron transmission,strict management of population movement should be employed.Moreover,the timely application of these strategies also plays a key role in disease control. | Qianqian Cui Zhengli Shi Duman Yimamaidi Ben Hu Zhuo Zhang Muhammad Saqib Ali Zohaib Baikadamova Gulnara Mukhanbetkaliyev Yersyn Zengyun Hu Shizhu Li | 2023 | Infectious Diseases of Poverty2023，12，2： | 0 |
| 16 | Investigation on the Effect of the Cultivation of Consumers'Scientific and Technological Concept on the Sales of Skin Care Products显示文摘The number of skin care products developed scientifically and technologically is increasing in the market now.Whether it is a gimmick or a real desire to make a good product,companies are actively promoting the development and growth of the technological skin care market.The analysis of our market survey indicates that companies and consumers generally show a trend of mutual progress along with the market growth of technological skincare.Companies and consumers alternately play a leading role in different stages of progress.In this survey study,consumers were divided into four types:minimalist consumers,trendy consumers,ingredient-based consumers,and technological consumers.A series of comparative analyses for these four groups showed that consumers have the trend to instinctively develop from minimalist to technological consumer.Along with the increase of skin care knowledges,consumers can more trust and be more willing to buy the technology-based skin care products.For those ones who has no experiences with the technology-based skin care products,after gaining skincare knowledges,they are also willing to try.This is a good signal for companies.While helping with consumers being more knowledgeable in skincare,companies can lead consumers to learn about their researches and products development,which will benefit the market acceptance of the products.Users can also benefit from gaining more relevant knowledges.With these knowledges,consumers can be clearer about their own needs,more rational on skincare purchasing,and they can select the correct skincare. | Wu Zengyun Gao Tianbao Chu Wenhui Yang Zeru Zhang Anqi Zhao Guoqing Tang Shengnan | 2021 | China Detergent & Cosmetics2021，6，3： | 0 |
| 17 | STABILIZATION OF MARKOVIAN JUMP LINEAR SYSTEMS VIA RANDOM COMMUNICATION TIME DELAYED AND IMPULSIVE CONTROLLERS显示文摘This paper deals with the stabilization problems for a networked control system via time-delayed and impulsive controllers.The random communication delays in the model signal are modeled as a Markov chain.First,we introduce a hybrid controller with delay and impulses for the networked control systems.Then,some sufficient conditions are proposed for the design of a hybrid controller such that the closed-loop system is stochastically stable. | Zengyun Wang Jing Liu | 2014 | Annals of Differential Equations2014，30，1： | 0 |
| 18 | Temperature Characteristics of BJMOSFET显示文摘The resolution expression for the temperature dependence of the current and threshold voltage is deduced as well as the analysis of temperature characteristics of BJMOSFET. Equivalent circuit of analysis and simulation has been established for the BJMOSFET temperature characteristics. By using the general circuit simulation software of PSpice9 and computer simulation, characteristic graphs of the BJMOSFET output characteristic, transient characteristic and amplitude-frequency characteristic with temperature variation are obtained. The results accorded very good with theoretical analysis and proved that BJMOSFET has better temperature characteristics than traditional MOSFET. | ZENGYun YANMin YANGHong-guan GAOYun | 2005 | Semiconductor Photonics and Technology2005，11，2： | 0 |
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