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141篇 您的检索式:作者名="Zheng’an"
    题名 作者 年代 出处 被引量
1Overview of hydro–wind–solar power complementation development in China显示文摘1Introduction Hydropower generation in China started over a century ago, greatly contributing to their economic and social development. Wind power and photovoltaic (PV) power generation began on a large scale in the 21st century.Sheng’an Zheng Gangliang Qian 2019Global Energy Interconnection2019,2,4:2
2Downregulation of NIT2 inhibits colon cancer cell proliferation andinduces cell cycle arrest through the caspase-3 and PARP pathways显示文摘Bo’an Zheng Rui Chai Xiaojun Yu 2015International Journal of Molecular Medicine2015,,:1
3Removal of heavy metals using polyvinyl alcohol semi-IPN poly(acrylic acid)/tourmaline composite optimized with response surface methodology显示文摘ZHENG Yi’an WANG Aiqin 2010J Chemical Engineering2010,162,1:1
4Molecular organic geochemical peculiarities of lacustrine core sediments in Fildes Peninsula, King George Island, Antarctica显示文摘The peculiarities of lipids in lacustrine core sediments from Fildes Peninsula, King George Island, Antarctica, are reported. The origin of high-molecular-weight n-alkanes, alkenes, fatty acids, alcohols is supposed to be related to the abundant moss occurring in the sediments. Abundant iso- and ante/so-fatty acids that occur in the sediments indicate a relatively strong bacterial activity in non-ice-cover zone than in other regions in Antarctica. The C18:2 unsaturated fatty acids mainly originate from autochthonous algae in the sediment pool, and the C18:2/C18:0 ratios in the profile are controlled more by paleotemperatures than source assemblies. Long-chain alkenones were identified in freshwater lacustrine sediment in Antarctica for the first time, of which Prymnesiophyceae is assumed to be the source organism. High relative abundance of C37:4 homologue in long-chain alkenone well correlates to the severely cold climate in Antarctica.ZHANG Gan SHENG Guoying PENG Ping’an ZHENG Honghan 2000Chinese Science Bulletin2000,45,S1:13
5Synthesis of Cycloundecanone from Benzimidazole Methiodide Salt显示文摘The intra-molecular addition reaction of Grignard reagent with quaternary C=N bond of benzimidazole methiodide salt is reported. and a novel method for the synthesis of cycloundecanone is provided.Zheng LI Zhen SHI (Department of Chemistry. Northwest University, Xi’an 710069) 2000Chinese Chemical Letters2000,11,4:4
6STRUCTURAL EVOLUTION OF UNDERCOOLED SINGLE-PHASE Ni-2wt%Pb MONOTECTIC ALLOY显示文摘The structural evolution of undercooled single-phase Ni-2wt%Pb monotectic alloy was systematically investigated by using the method of molten glass denucleating combined with superheating cycle. Within the achieved undercooling range e of 22 to 280K, the solidification structure undergoes three changes at 22K, 88K and 187K, respectively. With the increase of undercooling, common dendrites, the first class granular grains, nudercooled dendrites and the second class granular grains come out one after the other. Analytical results show that the granulation mechanism of the first class granular grains is owing to dendrite remelting and recrystallization, and the second is owing to dendrite break-op and recrystallization.H.X. Zheng, H. Xie and X.F. Guo (Xi’an University of Technology, Xi’an 710048, China) 2001Acta Metallurgica Sinica(English Letters)2001,14,1:3
7Application of FTA Method to Reliability Analysis of Vacuum Resin Shot Dosing Equipment显示文摘Faults of vacuum resin shot dosing equipment are studied systematically and the fault tree of the system is constructed by using the fault tree analysis(FTA) method. Then the qualitative and quantitative analysis of the tree is carried out, respectively, and according to the results of the analysis, the measures to improve the system are worked out and implemented. As a result, the reliability of the equipment is enhanced greatly.HE Zheng wen, XU Yu School of Management, Xi’an Jiaotong University, Xi’an 710049, P.R.China 2002International Journal of Plant Engineering and Management2002,7,1:2
8DISTRIBUTED PARAMETER NEURAL NETWORKS FOR SOLVING PARTIAL DIFFERENTIAL EQUATIONS显示文摘Novel distributed parameter neural networks are proposed for solving partial differential equations, and their dynamic performances are studied in Hilbert space. The locally connected neural networks are obtained by separating distributed parameter neural networks. Two simulations are also given. Both theoretical and computed results illustrate that the distributed parameter neural networks are effective and efficient for solving partial differential equation problems.Feng Dazheng Bao Zheng Jiao Licheng(Electronic Engineering Institute, Xidian University, Xi’an 710071) 1997Journal of Electronics(China)1997,14,2:1
9New paleomagnetic results from Ceno-Mesozoic volcanic rocks along southern rim of the Tarim Basin, China*显示文摘Meng Zifang Deng Yunshan Ding Zhaohai Zheng Yanpeng Li Yong’an Sun Dongjiang 1998Science in China Series D: Earth Sciences1998,,2:1
10LEARNING ALGORITHM OF STAGE CONTROL NBP NETWORK显示文摘This letter analyzes the reasons why the known Neural Back Promulgation (NBP)network learning algorithm has slower speed and greater sample error. Based on the analysis and experiment, the training group descending Enhanced Combination Algorithm (ECA) is proposed.The analysis of the generalized property and sample error shows that the ECA can heighten the study speed and reduce individual error.Yan Lixiang Qin Zheng (Xi’an JiaoTong University, Xi’an 710049) 2003Journal of Electronics(China)2003,20,6:1
11Supersonic flutter analysis based on a local piston theory显示文摘Zhang Wei wei Ye Zheng yin Zhang Chen’an 2009AIAA Journal2009,47,10:1
12BIT COMMITMENT USING PSEUDO-RANDOM SYNTHESIZER显示文摘This paper presents two practical message commitment schemes: one is suitable for committing many bits, and another is useful for committing any bit-long message. They are provably secure based on pseudo-random synthesizers. In these schemes, the sender may be unbounded to polynomial time and the receiver is bounded. The advantage of these schemes is that the secure parameter may be small.Zheng Dong Liu Shengli Wang Yumin (ISN Key Lab., Xidian University, Xi’an 710071) 1999Journal of Electronics(China)1999,16,4:0
13Study on dynamics of shear waves - Ⅱ Triggering mechanism and amplitude decay显示文摘Starting from vorticity equation, the triggering mechanism and amplitude decay of shear waves in the ocean are discussed in this paper. The theoretical analysis indicates that by the action of stripped external force (for examples, the sudden setting of stripped wind, moving stripped wind, etc. ), shear waves can be triggered. This is qualitatively consistent with satellite observations. The amplitude decay process of shear waves by the action of side friction is also discussed in the paper. The theoretical model is quantitatively consistent with satellite observations.YuanYeli Zheng Quan’an First Institute of Oceanography, State Oceanic Administration, Qingdao, China 1989Acta Oceanologica Sinica1989,8,2:0
14Description of two new species of Newsteadia Green(Hemiptera:Coccomorpha:Ortheziidae)from China with a key to Chinese species显示文摘This study reported two new species:Newsteadia multipori Zheng&Wu,sp.nov.,collected from pine needle litter in Guizhou Province,are described and illustrated for its adult female,male,and first-,second-and third-instar nymphs;N.chebalingensis Zheng&Wu,sp.nov.,collected from broad leaf litter in Guangdong Province,are described and illustrated for its adult female and first-instar nymph.Identification keys are provided to the adult females of Newsteadia species known in China and to the adult males of Newsteadia species known worldwide.Xinyi Zheng San’an Wu Jichun Xing 2023Zoological Systematics2023,48,3:0
15NONPARAMETRIC SPECTRAL ESTIMATORS FORSECOND-ORDER (ALMOST) CYCLOSTATIONARYCOMPLEX PROCESSES显示文摘Second-order almost cycloststionary complex processes are complex random signals with almost periodically time-varying statistics. Smoothed periodograms are proposed for related to cyclic spectral estimation and are shown to be consistent. Asymptotic covariance expressions are derived along with their computable forms.Mao Yongcai Bao Zheng(Laboratory for Radar Signal Processing, Xidian University, Xi’an, 710071) 1997Journal of Electronics(China)1997,14,1:0
16A NEW ESPRIT METHOD FOR BLIND ESTIMATES OF DOA-DOPPLER FREQUENCY WITH UNKNOWN ARRAY MANIFOLD显示文摘A novel rotational invariance technique for blind estimates of direction of arrival (I)OA) and Doppler frequency with unknown array manifold due to array sensor uncertainties is proposed, taking Doppler frequency difference between a successive pulses as rotational parameter. The effectiveness of the new method is confirmed by computer simulation. Compared with the existing 2-D DOA-frequeucy estimate techniques, the computation load of the proposed method can be saved greatly.Liao Guisheng Bao Zheng(Institute of Electronic engineering, Xidian University, Xi’an 710071) 1998Journal of Electronics(China)1998,15,1:0
17Participatory Environmental Management and its Framework of Group Decision Support System显示文摘Considering some drawbacks of the mainstream approach to environmental management (EM),the conception and basic idea of Participatory EM(PEM) are put forward.PEM possesses some main features and benefits that are superior to the mainstream approach,but also faces the crucial constraint in decision-making.The dilemma can be effectively settled by applying an advanced decision-making support tool-group decision support system(GDSS).On the basis of recognizing the complex decision-making environment of PEM,this paper describes the components of GDSS for PEM(PEM-GDSS) and further discusses the basic requirement of PEM-GDSS.CHEN Kun-yu,QIN Zheng~*(Xi’an Jiaotong University,Shanxi Xi’an 710049,PRC) 2003Journal of Northeast Agricultural University(English Edition)2003,10,2:0
18STUDY ON THE NETWORK OF FOREST BURNING LINKS显示文摘Based on the research of the Forest Burning Links published in the Journal ofNortheast Forestry University in 1987,this paper continues to study the theory of forest burningFire behavior has been divided into two important series in this paper.One is fire occurrence andspread, and the other is burning intensity.The first series has been divided into three grades as A:toburn difficulty and spread slowly;B:to burn possibly and spread little fast;and C:to burn easilyand spread fast.The second series has been divided into four grades as I:light burning;Ⅱ:me-dium burning;Ⅲ:intense burning;and Ⅳ:severe burning.The firsts series can be put as ordinate,and the second series can be put as abscissa.Then the network of 12 forest burning links can beformed.In the network,the relatioship,the law of distribution and the variation of different forestburning links can be shown clearly.The studies of the distrubution of fuel types,topography,siteand fire kinds in the network can provide the basic theory for fireZheng Huanneng Hu Haiqing Northeast Forestry University Wang Dexiang Northwest Forestry College, Xi’an 1991Journal of Northeast Forestry University1991,2,2:0
19Reliable grading robust stabilization for uncertain time-varying systems via dynamic compensator显示文摘A new general model for uncertain time-varying parameters and a new measure sensor failure model are presented, and the problems of both grading robust stabilization and reliable grading robust stabilization for such systems are studied. By the Lyapunov stability theory and matrix algebra method, some sufficient criteria for the above two control problems are established in quasi-linear matrix inequalities (Q-LMIS) forms. In view of linear matrix inequality (LMI) approach, a solving procedure for the Q-LMIS problem is proposed. The solvability of the Q-LMIS problem can be improved obviously by adding some LMI constraints to the Q-LMIS. Based on the two Q-LMIS criteria, a grading robust stable control strategy, namely, the controller with different energy is acted on the system with different uncertain parameter range, is presented. The numerical simulating results show that the grading robust stable control strategy for the robust stabilization of uncertain systems has important theoretical and practical significance.JIA Xinchun and ZHENG Nanning(Institute of Artificial Intelligence and Robotics, Xi’an Jiaotong University, Xi’an 710049, China) 2002Progress in Natural Science:Materials International2002,12,10:7
20DYNAMIC BEHAVIOR OF A CRACKED FLEXIBLE ROTOR SUPPORTED ON JOURNAL BEARINGS显示文摘The dynamic behavior of a cracked flexible rotor supported on three kinds ofjournal bearings is presented. Numerical experiments show that nonsynchronous responseswill happen due to the rotor crack, and the amplitudes of the nonsynchronous componentsbecome larger with the increase of crack. On the other hand, the fluid forces of journalbearings can suppress the nonsynchronous response. The (1/2) × or (3/2) × harmoniccomponent rarely appears for small crack near the rotating speed ratio Ω = 2Ωc or Ω =(2/3)Ωc. In the case of supercritical rotating speed, the additional 0× harmonic component is increased as the crack increases. The bearing parameters affect greatly the occur-rence of the nonsynchronous responses by means of exerting innuence on the critical spedand the stabi1ity of the system.Zheng Jibing Meng Guang(Institute of Vibratian Engineering, Northwestern PolytechnicalUniversity, Xi’an, China, 710072) 1997Chinese Journal of Aeronautics1997,10,1:6
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