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浏览/检索结果: 共14条，第1-10条 帮助 条数/页： 5101520253035404550556065707580859095100 排序方式： 请选择题名升序题名降序提交时间升序提交时间降序作者升序作者降序发表日期升序发表日期降序 Concentration phenomenon of semiclassical states to reaction-diffusion systems 期刊论文  OAI收割 ANNALI DI MATEMATICA PURA ED APPLICATA, 2022, 页码: 39 作者:  Gou, Tianxiang;  Zhang, Zhitao   |  收藏  |  浏览/下载：17/0  |  提交时间：2023/02/07 Concentration phenomenon  Semiclassical states  Reaction-diffusion system  Variational methods   Intestinal Parasitoses among Chepang and Musahar Community People of Makwanpur and Nawalparasi Districts of Nepal 期刊论文  OAI收割 ACTA PARASITOLOGICA, 2020, 卷号: 66, 期号: 1, 页码: 146-154 作者:  Khadka, Sujan;  Sapkota, Sanjeep;  Adhikari, Sanjib;  Dubey, Ashok Kumar;  Thapa, Alina   |  收藏  |  浏览/下载：45/0  |  提交时间：2021/09/14 Intestinal parasitosis  Musahar  Chepang  Direct microscopy  Concentration methods  Deworming   Existence of optical vortices in R-2 期刊论文  OAI收割 NONLINEAR ANALYSIS-REAL WORLD APPLICATIONS, 2019, 卷号: 50, 页码: 67-85 作者:  Guo, Qing;  Cao, Daomin;  Li, Hang   |  收藏  |  浏览/下载：69/0  |  提交时间：2020/01/10 Optical vortices  Variational methods  Concentration compactness  Nodal solutions   Influence of sensitizer concentration on the upconversion luminescence of NaYF4: Yb3+, Er3+ nanoparticles (EI CONFERENCE) 会议论文  OAI收割 2012 2nd International Conference on Machinery, Materials Science and Engineering Applications, MMSE 2012, June 16, 2012 - June 17, 2012, Wuhan, China 作者:  Zhao J.;  Zhao Y.;  Zhao Y.;  Zhao Y. 收藏  |  浏览/下载：24/0  |  提交时间：2013/03/25 A series of NaYF4: Yb3+  Er3+ nanoparticles with different doping concentration were successfully prepared by the combination of coprecipitation and hydrothermal methods using sodium citrate as chelator. Upconversion luminescence can be observed in all of the samples at room temperature. Fixed the Er3+ concentration with 1 mol% unchanged  the effect of the Yb3+ concentration on the upconversion luminescence of NaYF4: Yb3+  Er3+ samples were studied when the doped Yb3+ concentrations were 0 mol%  1 mol%  2 mol%  5 mol%  10 mol% and 20 mol%  respectively. As increasing the Yb 3+ concentration  the total intensity of the upconversion luminescence of the samples is increasing while the ratio of red to green emission increases firstly and then decreases. The maximum ratio value is 22.1 when the Yb3+ concentration is 10 mol%. It is found that the cross relaxation and cooperative sensitization effect are the reasons for the phenomenon above. (2012) Trans Tech Publications.   Exploring spatial evolution of economic clusters: A case study of Beijing SCI/SSCI论文  OAI收割 2012 Yang Z. S.; Sliuzas R.; Cai J. M.; Ottens H. F. L. 收藏  |  浏览/下载：16/0  |  提交时间：2014/12/24 Economic cluster  Spatial cluster  Spatial statistics  Moran's I  Beijing  distance-based methods  geographic concentration  regional income  agglomeration  industries  location  statistics  advantage  patterns  policy   MULTIPLE SOLUTIONS AND THEIR LIMITING BEHAVIOR OF COUPLED NONLINEAR SCHRODINGER SYSTEMS 期刊论文  OAI收割 ACTA MATHEMATICA SCIENTIA, 2010, 卷号: 30, 期号: 4, 页码: 1199-1218 作者:  Wan Youyan 收藏  |  浏览/下载：18/0  |  提交时间：2015/06/25 Elliptic system  Schrodinger equation  variational methods  Nehari manifold  relative category  concentration   Compounds from Acorus tatarinowii: Determination of Absolute Configuration by Quantum Computations and cAMP Regulation Activity 期刊论文  OAI收割 JOURNAL OF NATURAL PRODUCTS, 2010, 卷号: 73, 期号: 6, 页码: 1160-1163 作者:  Tong, Xiao-Gang;  Wu, Gui-Sheng;  Huang, Cheng-Gang;  Lu, Qing;  Wang, Yue-Hu   |  收藏  |  浏览/下载：36/0  |  提交时间：2012/03/21 Ageratum Conyzoides  Asteraceae  Liver Markers  Histopathological Study  Toxicological Study  Catalytic Concentration  Myocardial-infarction  Ifcc Methods  Toxicity  Biomarkers  Parameters  Asteraceae  Enzymes  Leaves   Positive solutions for Schrodinger-Poisson equations with a critical exponent 期刊论文  OAI收割 NONLINEAR ANALYSIS-THEORY METHODS & APPLICATIONS, 2009, 卷号: 70, 期号: 6, 页码: 2150-2164 作者:  Zhao, Leiga;  Zhao, Fukun   |  收藏  |  浏览/下载：26/0  |  提交时间：2018/07/30 Variational methods  Concentration-compactness principle  Critical growth  Pohozaev identity   On the existence of solutions for the Schrodinger-Poisson equations 期刊论文  OAI收割 JOURNAL OF MATHEMATICAL ANALYSIS AND APPLICATIONS, 2008, 卷号: 346, 期号: 1, 页码: 155-169 作者:  Zhao, Leiga;  Zhao, Fukun   |  收藏  |  浏览/下载：22/0  |  提交时间：2018/07/30 ground state solution  variational methods  concentration-compactness principle  Pohozaev identity   A high-accuracy parameter estimation algorithm for jointless Frequency-shift track circuit (EI CONFERENCE) 会议论文  OAI收割 ISECS International Colloquium on Computing, Communication, Control, and Management, CCCM 2008, August 3, 2008 - August 4, 2008, Guangzhou, China 作者:  Zheng X. 收藏  |  浏览/下载：22/0  |  提交时间：2013/03/25 FSK (Frequency Shift keying) signal  which has advantages of narrow-bandwidth  strong anti-interference ability  long transmission distance and so on  is used in jointless Frequency-shift track circuit to send different kinds of control signals. However  as FSK is non-linearly modulated  parameter estimation with high accuracy is hard to realize. Based on the spectrum analysis complement with time-frequency distribution  a highaccuracy FSK signal parameter estimation algorithm is put forward in this paper. According to the signal characteristics  under-sampling and ZFFT are used to improve the accuracy of spectrum analysis  and the base frequency resolution meets system requirement of 0.02Hz. Wigner-Ville distribution has an excellent time-frequency concentration while serious cross-term interference at the same time. Through the design of kernel function  the cross-terms are almost suppressed and the upper/down side frequency resolution meets the system requirement of 0.2Hz. The effectivities of all the methods mentioned above have been proved by MATLAB simulation  which pave a solid way for the development of high-accuracy FSK signal parameter estimation devices. 2008 IEEE.