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Search Results: 1 - 10 of 399071 matches for " <br>陈义 "
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Cutting through the confusion in high performance liquid chromatographic column technology
非线性电泳

Robert STEVENSON,<br>
色谱 , 2011,
Abstract: 电泳大家当已耳熟能详了,它发现于18世纪初期,有悠久的历史.电泳因Tiselius而进入分离领域,为蛋白质科学的建立和发展立下了汗马功劳.其贡献至今不息,一直是生物学家的掌中宝.
SOME RESULTS OF ERGODICITY FOR NONHOMOGENEOUS MARKOV CHAINS
非齐次马尔科夫链遍历性的一些结果

Chen Yongyi,<br>
系统科学与数学 , 1996,
Abstract: By the comparison of transition matrices of two nonhomogeneous Markov chains, we discuss the relations of ergodicity for the two chains and obtain some sufficient conditions for a nonhomogeneous Markov chain to be strongly ergodic. The relations of uniformstrong ergodicity and ulilform weall ergodicity for a nonhomogeneous Markov chain are analysedand some sufficient conditions of uniform strong ergodicity for a nonhomogeneous Markov chainare obtained.
THE INFECTION OF EVELYN1A KETELEER1A BY ARMORED SCALES IN RELATION TO FLUORIDE POLLUTION OF THE AIR IN YUNNAN PROVINCE
大气氟污染与油杉剌圆盾蚧的发生

Zhou Zhangyi,<br>周章,学英
生态学报 , 1981,
Abstract: Armored scale (Mctaspitiotus yunnansls Tang) is a common leaf pest on needles of Evelynia Keteleeria (Keteleeria, evelyniuna). In ordinary stands, the percentage of trees infected by armored scales is about 70%, but the density index of insect occurrence is only about 2% and can hardly do any harm.As our study shows the slow growth, weak vigour and disturbance of normal physiological processes of the tree caused by the serious impact of hydrogen fluoride from phosphate fertilizer plant are due to some bioch...
FURTHER ANALYSIS OF OPTIMAL MEAN SQUARE ESTIMATION AND NONLINEAR IEM MODEL
最小均方差条件和非线性IEM模型的分析

Yiliang Chen,<br>李艺,
力学学报 , 2003,
Abstract: In this paper the implication of the Optimal Mean Square Estimation (OMSE) condition on the mixing model is further discussed. It is proved that the OMSE condition can replace the moment equations as the constraints facilitating the modeling of mixing term, and that an exact expansion of the mixing term can be deduced by solely using OMSE condition, which is proved consistent with the exact results of Valino et al. in the long relaxation time limit. The nonlinear IEM (NLIEM) model is deduced as a result of a general formula. Finally, two basic flow fields are calculated with NLIEM model, the first of which is the binary mixing of an passive scalar in a homogeneous stationary velocity field and the second is the evolution of passive temperature fluctuation in a grid turbulence with a constant mean transverse temperature gradient imposed. The results are compared with those calculated with IEM model based on the DNS and experimental data. It is found that in the first problem the initial relaxation of the PDF observed in the DNS data is accurately predicted with NLIEM model but very bad with IEM, although both of them predict correctly the final relaxation to Gaussian PDF. In the second problem, the exponential tails observed in the PDF's of temperature fluctuation are reproduced more notably with NLIEM than IEM model and the super flatness of the PDF predicted with NLIEM model relaxes to around 18 which is more close to the experimental value 20 than 15, the value predicted with IEM model.
SUDDEN CHANGE OF DAYA BAY TEMPERATURE STRATIFICATION IN''''SEPTEMBER
大亚湾水温层化的季节性突变

Li Li,Chen Yibin,<br>李立,
海洋科学 , 1992,
Abstract: Process of destratification during SW-NE monsoon transit was observed in Daya Bay, by moorings of temperature recorder. It was shown that seasonal destratification occurred rapidly in early September each year in Daya Bay. Within less than 10 d, the Bay suddenly changed its condition from highly vertical stratified into homogeneous. The process is accompanied by increase of water heat content. It is suggested that advection of upper layer warm water from the open shelf during monsoon transit may be responsable for this sudden change.
Robust stabilization of uncertain Lur''e-Postnikov systems with state delay
带有时滞状态的不确定Lur''e-Postnikov系统的鲁棒镇定(英文)

CHEN Wan-Yi,<br>
控制理论与应用 , 2003,
Abstract: Using Lyapunov and a Razumikhin type method,robust stabilization of uncertain Lur'e Postnikov systems with delay state is discussed. For uncertain Lur'e Postnikov system with delay state and with some norm bounded perturbations, if its coefficient matrices satisfy an algebraic Riccati inequality, then via a linear static and/or dynamic state feedback, quadratic stability for its closed loop system is guaranteed. Also, using a Razumikhin type appraoch, a sufficient condition is given for the stabilization of a class of uncertain nonlinear systems with time varying delay.
Key Factors in the Control of Electroosmosis with External Radial Electric Field in CE
毛细管电泳中影响径向电场控制电渗的主要因素

Y Zhu,Y Chen,<br>朱英,
色谱 , 1999,
Abstract: Direct control of electroosmosis flow (EOF) by external radial electric field was performed at room temperature using a home-made field-modulated capillary electrophoresis (CE) system. The EOF was monitored at 206 nm by using DMSO as a probe. To apply a radial electric field across the CE capillary wall, the capillary was cased with a wide column. Both of the concentric space and the capillary bore were then filled with an identical running buffer and applied with an axial electric field of 150 V/cm but starting from different levels. All of the tubes used were made of fused silica with polyimide over-coating (from the Yongnian Optical Fiber Work, Hebei, P. R. China). The size of the CE capillaries adopted was 25-100 microns i.d. (375 microns o.d.) x 28.5/45 cm (effective/total length), and that of the casing column 400 microns i.d. x 32 cm. To investigate the fundamentals of the external EOF control when using the flexible fused silica capillaries, various parameters have been inspected such as pH, buffer composition, additives and capillary wall feature etc.. As expected, to well control both of the magnitude and direction of the electroosmosis, the buffer pH should be kept below 4 and the buffer concentration below 50 mmol/L. However, buffers below 1 mmol/L should be avoided because such a diluted running buffer may result in poor CE separation. Weak electrolytes like citric acid, tartaric acid and acetic acid were found to be capable of generating better EOF control than the strong electrolytes such as phosphate and chlorides. This is possibly due to the formation of looser electric double layer with the weak rather than the strong electrolytes. Some wall coatings like calix arene and its derivatives can evidently improve the EOF control even at pH 5. This reveals an exciting way to expend the controllable pH range. In addition, narrow-bore capillaries were demonstrated to be better than wide-bore tubes. Other conditions such as buffer additives and capillary rinse procedure were shown to have only negligible influence on the control.
Photonic crystals for analytical chemistry
光子晶体在分析化学中的应用

CHEN Yi,LI Jincheng,<br>,李晋成
色谱 , 2009,
Abstract: Photonic crystals, originally created to control the transmission of light, have found their increasing value in the field of analytical chemistry and are probable to become a hot research area soon. This review is hence composed, focusing on their analytical chemistry-oriented applications, including especially their use in chromatography, capillary- and chip-based electrophoresis.
THE MATHEMATICAL MODEL FOR ACCESS MODE OF CONTENTION-COLLISION CANCELLATION IN MULTI-STAR LAN
竞争一冲突淘汰存取方式的数学模型

Lu Zhaoyi,Chen Yongyi,Zhang Jianshu,<br>逯昭,,张建树
电子与信息学报 , 1996,
Abstract: A kind of access model of the contention-collision cancellation in multi-star LAN has been discussed, the mathematical model is built, and the mathematical result is also given.
Multi-Gate GaAs MESFET Switch
多栅GaAs MESFET开关的结构设计

Chen Xinyu,Hao Xiping,Chen Jiyi,<br>新宇,郝西萍,
半导体学报 , 2004,
Abstract: The structure and characteristic of multi-gate switch are described.A fundamental problem in switch design is to maintain low insertion loss when improving power handling capacity.Multi-gate switch solves the problem due to its typical structure.The optimality analysis of the distance between gates in the design of triple-gates switches is described.The results are verified by comparing two structures of triple-gate switches with the measured results.
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