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| 1 | Design,modeling and experiments of broadband tristable galloping piezoelectric energy harvester显示文摘Galloping based piezoelectric energy harvester is a kind of micro-environmental energy harvesting device based on flowinduced vibrations.A novel tristable galloping-based piezoelectric energy harvester is constructed by introducing a nonlinear magnetic force on the traditional galloping-based piezoelectric energy harvester.Based on Euler-Bernoulli beam theory and Kirchhoff’s law,the corresponding aero-electromechanical model is proposed and validated by a series of wind tunnel experiments.The parametric study is performed to analyse the response of the tristable galloping-based piezoelectric energy harvester.Numerical results show that comparing with the galloping-based piezoelectric energy harvester,the mechanism of the tristable galloping-based piezoelectric energy harvester is more complex.With the increase of a wind speed,the vibration of the bluff body passes through three branches:intra-well oscillations,chaotic oscillations,and inter-well oscillations.The threshold wind speed of the presented harvester for efficiently harvesting energy is 1.0 m/s,which is decreased by 33% compared with the galloping-based piezoelectric energy harvester.The maximum output power of the presented harvester is 0.73 mW at 7.0 m/s wind speed,which is increased by 35.3%.Compared with the traditional galloping-based piezoelectric energy harvester,the presented tristable galloping-based piezoelectric energy harvester has a better energy harvesting performance from flow-induced vibrations. | Junlei Wang Linfeng Geng Shengxi Zhou Zhien Zhang Zhihui Lai Daniil Yurchenko | 2020 | Acta Mechanica Sinica2020，36，3： | 9 |
| 2 | GLOBAL STABILITY AND HOPF BIFURCATION OF AN SIS EPIDEMIC MODEL WITH TIME DELAYS显示文摘An SIS epidemic model with a discrete delay has been investigated in this article. By means of Liapunov functional, some sufficient conditions of global stability to endemic equilibrium and disease free equilibrium have been obtained. The influence of time delay on the stability of equilibria is displayed. The switch of stability and the Hopf bifurcation from the endemic equilibrium have been discussed. | YUAN Sanling MA Zhien (Department of Applied Mathematics, Xi’an Jiaotong University, Xi’an 710049, China) | 2001 | Journal of Systems Science & Complexity2001，14，3： | 7 |
| 3 | Experimental Study on Preparation of Natural Gas Hydrate by Crystallization显示文摘In this paper, the saturated solution crystallization method is proposed to promote the formation of hydrate by means of the known similarities between the hydrate formation process and the crystallization process. In this method,adding the second phase crystals was used to replace the spontaneous formation of hydrate crystal nuclei to form hydrate.The effects of saturated Na_2SO_4, MgSO_4, NH_4HCO_3 and CuSO_4 solutions on the formation rates of natural gas hydrate and gas storage capacity were investigated. The results showed that the saturated solution had an influence on the hydrate formation process. Under the given experimental conditions, the saturated Na_2SO_4 solution showed a highest increase in the hydrate formation rate, and the average hydrate formation rate in its presence was 11.8 times higher than that obtained in the deionized water. Moreover, the largest formation rate of gas hydrates observed in the saturated Na_2SO_4 solution was 386 times bigger than that in the deionized water, and the gas storage capacity increased by 10 times. In addition, the average hydrate formation rate in the saturated Mg SO_4 solution was faster than that in water by 20 times. The largest formation rate of gas hydrates in the saturated MgSO_4 solution was 165 times faster than that obtained in the deionized water, and the gas storage capacity increased by 6.2 times. The saturated NH_4HCO_3 and saturated CuSO_4 solutions also influenced the formation process of hydrate. Therefore, the crystallization method of saturated solution can be used to achieve a highefficiency preparation of natural gas hydrates, which provides theoretical guidance for the storage of natural gas in the form of hydrate. | Ma Shihui Pan Zhen Li Ping Wu Yuguo Li Bingfan Kang Jinke Zhang Zhien | 2017 | China Petroleum Processing & Petrochemical Technology2017，19，1： | 7 |
| 4 | THE THRESHOLD OF SURVIVAL FOR PREDATOR-PREY VOLTERRA SYSTEM OF THREE SPECIES IN A POLLUTED ENVIRONMENT显示文摘THETHRESHOLDOFSURVIVALFORPREDATOR-PREYVOLTERRASYSTEMOFTHREESPECIESINAPOLLUTED ENVIRONMENTTHETHRESHOLDOFSURVIVALFORPREDATOR-PR... | MA Zhien LUO Zhixue Department of Mathematics,Xi’an Jiaotong University, Xi’an 710049,China)JIN Zhen(Department of Mathematics,North China Institute of Technology,Taiyuan 030051,China)ZHAO Hengbao (Nankai University,Tianjin 300071, China) | 1995 | Systems Science and Mathematical Sciences1995，8，4： | 4 |
| 5 | ULTIMATE STABILITY OF A TYPE OF CHARACTERISTIC EQUATION WITH DELAY DEPENDENT PARAMETERS显示文摘延期微分系统广泛地在许多不同的域里被使用。决定他们的 equilibria 的本地稳定性是重要的。为有延期依赖者参数的系统, equilibria 的稳定性分析复杂、困难。在这篇论文,我们将与延期依赖者参数调查典型方程的一种类型的最终的稳定性。我们的结果证明有延期依赖者参数的典型方程可以是之一在之间最终稳定、最终不稳定、交替稳定、不稳定。Applyingour 结果,最终的稳定性能经常直接被决定并且不必呼吁数学软件。二个例子在这篇论文被给。 | Jianquan LI Zhien MA | 2006 | Journal of Systems Science & Complexity2006，19，1： | 4 |
| 6 | STUDY ON AN SIS EPIDEMIC MODEL WITH TIME VARIANT DELAY显示文摘In this paper,we study an SIS epidemic model with a time variant delay.By means of Liapunov functional,some sufficient conditions of global stability to endemic equilibrium and disease free equilibrium have been obtained.The influence of time delay on the stability of equilibria is displayed. | YUAN Sanling MA Zhien (Department of Applied Mathematics, Xi ’an Jiaotong University, Xi ’an 710049, China] | 2002 | Journal of Systems Science & Complexity2002，15，3： | 4 |
| 7 | 预变形对X80直缝埋弧焊管焊接接头残余应力及疲劳性能影响的模拟研究显示文摘本文采用数值模拟方法,通过预拉伸变形模拟钢管的扩径过程,分析了扩径变形对X80直缝埋弧焊钢管焊接接头残余应力分布的影响,进而分析残余应力对疲劳性能的影响。结果表明:模拟扩径拉伸变形后,因焊接热影响区的组织和性能变化及焊缝余高的作用,残余应力主要集中在焊接热影响粗晶区,其最大值出现在外焊缝焊趾的粗晶区。随变形量增加,残余应力也明显增大。当变形量由0.5%增加到4%时,外焊趾处最大残余应力由429 MPa增加到481 MPa。残余应力的增加显著降低疲劳性能,疲劳寿命最低值也出现在外焊缝焊趾处。与未变形试样的疲劳寿命相比,残余应力由429 MPa增加到481 MPa时,疲劳寿命损失率由18.0%增加到56.2%。 | 乔桂英 张诗禹 ZHANG Zhien 徐凯 肖福仁 | 2020 | 燕山大学学报2020，44，6： | 3 |
| 8 | Analysis of routes for electrochemical conversion of CO_(2) to methanol显示文摘In the context of peak carbon and carbon neutrality,the utilization of CO_(2)has attracted attention with the aim of reducing carbon emissions by converting CO_(2)into high-value chemicals or energy.Methanol(MeOH),which is both a hydrogen and a carbon carrier,is considered the most promising among the CO_(2)-conversion products.This paper focus on routes for electrochemical conversion of CO_(2)to MeOH using green power and green hydrogen to achieve negative CO_(2)emissions.Three feasible technical routes for electrochemical conversion of CO_(2)to MeOH are proposed in this paper:Route 1,electrolysis of water to H_(2)and hydrogenation of CO_(2)to MeOH;Route 2,electrochemical reduction of CO_(2)to MeOH;and Route 3,co-electrolysis of CO_(2)-H_(2)O to syngas and synthesis of MeOH from syngas.Techno-economic assessments of the three routes are conducted using technical maturity surveys,system simulations and cost analyses to provide reference data for route selection for CO_(2)conversion to MeOH in China.Compared with the other routes,Route 1 is advantageous in terms of technical maturity and commercial application prospects.Although Route 1 is presently economically unviable,it is expected to achieve profitability and commercial application in the future with decreases in the cost of renewable power and continuous development of water-electrolysis technology. | Pingping Li Siqi Gong Chufu Li and Zhien Liu | 2022 | Clean Energy2022，6，1： | 2 |
| 9 | Persistence in population models with demographic fluctuations显示文摘 | Thomas G. Hallam Ma Zhien | 1986 | Journal of Mathematical Biology1986，，3： | 2 |
| 10 | Atomically precise metal-chalcogenide semiconductor molecular nanoclusters with high dispersibility:Designed synthesis and intracluster photocarrier dynamics显示文摘A comprehensive understanding of excited-state dynamics of semiconductor quantum dots or nanomaterials at the atomic or molecular level is of scientific importance.Pure inorganic(or non-covalently protected)seimiconductor molecular nanoclusters with atomically precise structure are contributive to establish accurate correlation of excited-state dynamics with their composition/structure,however,the related studies are almost blank because of unresolved solvent dispersion issue.Herein,we designedly created the largest discrete chalcogenide seimiconductor molecular nanoclusters(denoted P2-CuMSnS,M=In or/and Ga)with great dispersibility,and revealed an interesting intracluster“core–shell”charge transfer relaxation dynamics.A systematic red shift in absorption spectra with the gradual substitution of In by Ga was experimentally and computationally investigated,and femtosecond transient absorption measurements further manifested there were three ultrafast processes in excited-state dynamics of P2 nanoclusters with the corresponding amplitudes directed by composition variation.Current results hold the great promise of the solution-processible applications of semiconductor-NC-based quantum dots and facilitate the development of atomically precise nano-chemistry. | Jiaxu Zhang Chaochao Qin Yeshuang Zhong Xiang Wang Wei Wang Dandan Hu Xiaoshuang Liu Chaozhuang Xue Rui Zhou Lei Shen Yinglin Song Dingguo Xu Zhien Lin Jun Guo Haifeng Su Dong-Sheng Li Tao Wu | 2020 | Nano Research2020，13，10： | 2 |
| 11 | Global dynamics of an epidemic model with time delay显示文摘 | WANG Wcndi MA Zhien | 2002 | Nonlinear Analysis: Real Word Applications2002，3，： | 1 |
| 12 | Stability analysis for differential infectivity epidemic models显示文摘 | Zhien Ma Jianping Liu Jia Li | 2003 | Nonlinear Analysis:Real World Applications2003，4，： | 1 |
| 13 | Preparation and crystallization of nhrafine Li2O-Al2O3-nSiO2 powders显示文摘 | Liu zhien Sun yihui | 1995 | Journal of Material Science1995，30，： | 1 |
| 14 | Epidemiologieal models for mutating pathogens显示文摘 | Li Jia Zhou Yieang Ma Zhien | 2004 | SIAM J Appl Math2004，65，1： | 1 |
| 15 | Stability analysis for differential infectivity epidemic models显示文摘 | ZHIEN MA JIANPING LIU JIA LI | 2003 | Nonlinear Analysis:Real World Applications2003，4，5： | 1 |
| 16 | Global analysis of SIS epidemic models with variable total population size显示文摘 | LI Jianquan MA Zhien | 2004 | Mathematical and Computer Modelling2004，39，： | 1 |
| 17 | Global stability of a delayed SIRS epidemic model with saturation incidence and temporary immunity显示文摘 | RUI Xu ZHIEN Ma | 2010 | Computers and Mathematics with Appl2010，59，9： | 1 |
| 18 | Global analysis of SIS epidemic models with varying total population size显示文摘 | Li Jianquan Ma Zhien | 2004 | Mathematical and Computer Modelling2004，39，： | 1 |
| 19 | Effects of quarantine in six endemic models for infectious diseases显示文摘 | Herbert Hethcote Ma Zhien Liao Shengbing | 2002 | Mathematical Biosciences2002，180，： | 1 |
| 20 | Discussion of head stream of the concept of Qi transformation显示文摘 | Cen wei Wang Zhien | 2011 | Seek Medical and Ask the Medicine2011，9，11： | 1 |
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