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Search Results: 1 - 10 of 112471 matches for " ZHANG Zhen "
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4-Hydroxy-N′-(4-hydroxy-3-nitrobenzylidene)benzohydrazide
Zhen Zhang
Acta Crystallographica Section E , 2011, DOI: 10.1107/s1600536811000195
Abstract: The molecule of the title compound, C14H11N3O5, assumes an E configuration with respect to the methylidene unit. An intramolecular O—H...O hydrogen bond is present in the molecule. The dihedral angle between the mean planes of the two benzene rings is 5.46 (15)°. The crystal structure is stabilized by intermolecular O—H...O, O—H...N, and N—H...O hydrogen bonds.
2-Hydroxy-N′-(4-hydroxy-3-nitrobenzylidene)benzohydrazide
Zhen Zhang
Acta Crystallographica Section E , 2011, DOI: 10.1107/s1600536811000201
Abstract: The title compound, C14H11N3O5, crystallized with two independent molecules per asymmetric unit. Each molecule assumes an E configuration with respect to the methylidene unit. Intramolecular O—H...O and N—H...O hydrogen bonds are present in each molecule and they are linked by an O—H...O hydrogen bond. The dihedral angles between the mean planes of the two benzene rings are 4.45 (16) and 1.7 (2)° in the two molecules. The crystal structure is stabilized by intermolecular O—H...O and N—H...O hydrogen bonds.
3-Chloro-N′-(4-hydroxy-3-nitrobenzylidene)benzohydrazide methanol disolvate
Zhen Zhang
Acta Crystallographica Section E , 2011, DOI: 10.1107/s1600536811021568
Abstract: In the title compound, C14H10ClN3O4·2CH4O, the main molecule is in an E configuration with respect to the methylidene unit. The dihedral angle between the mean planes of the two benzene rings is 1.9 (3)°. In the crystal, intermolecular N—H...O, O—H...O and bifurcated O—H...(O, O) hydrogen bonds link the components into sheets parallel to (100). An intramolecular O—H...O hydrogen bond is also present.
3-Chloro-N′-(2-chloro-5-nitrobenzylidene)benzohydrazide
Zhen Zhang
Acta Crystallographica Section E , 2011, DOI: 10.1107/s160053681102157x
Abstract: The title molecule, C14H9Cl2N3O3, has an E configuration with respect to the methylidene unit. The dihedral angle between the mean planes of the two benzene rings is 12.3 (3)°. In the crystal, molecules are linked via bifurcated N—H...(O, N) hydrogen bonds into chains along [001].
A Solution Based on Modeling and Code Generation for Embedded Control System  [PDF]
Guohua WU, Dongwu CHENG, Zhen ZHANG
Journal of Software Engineering and Applications (JSEA) , 2009, DOI: 10.4236/jsea.2009.23023
Abstract: With the development of computer technology, embedded control system plays an important role in modern industry. For the embedded system, traditional development methods are time-consuming and system is not easy to maintain. Domain-specific modeling provides a solution for the problems. In this paper, we proposed development architecture for embedded control systems based on MIC. GME is used to construct meta-model and application model, model in-terpreter interprets model and stores model information in xml format document. The final cross-platform codes are automatically generated by different templates and xml format document. This development method can reduce time and cost in the lifecycle of system development.
Empirical Analysis of the Spread of University Students’ Amative Behavior  [PDF]
Xiaoling Yu, Zhen Jia, Cuiping Zhang
Applied Mathematics (AM) , 2013, DOI: 10.4236/am.2013.48A019
Abstract:

We used a questionnaire to obtain data about 664 university students’ amative behavior in a campus. Then we studied dissemination rules of university students’ amative behavior on campus social network. We found the amative behavior changes over time by focusing on the analysis of love group’s influence to single people and single group’s affected degree. Meanwhile, we compared the influence of single and multiple social relationships to the spread of amative behavior, and the result shows diversity of social relationships is a significant effect factor in spreading process.

TeV Blazars as the Sources of Ultra High Energy Cosmic Rays  [PDF]
Bingkai Zhang, Xiaoyun Zhao, Zhen Cao
International Journal of Astronomy and Astrophysics (IJAA) , 2014, DOI: 10.4236/ijaa.2014.43046
Abstract: The origin of ultra high energy cosmic rays (UHECRs) is still an open question in astroparticle physics. TeV blazars are a small group of active galactic nuclei (AGNs). They all have been observed in TeV gamma ray band, and show violent variabilities in flux at all wavelengths. So it is believed that they have abilities to produce UHECRs. To judge whether the TeV blazars can be the candidates of the origin of UHECRs, we collect the information of emission region of 38 TeV blazars, and estimate the maximum energy that the charged particle can be accelerated there. The results show that TeV blazars have abilities to accelerate cosmic rays to the energy above 1018 eV, some even higher than 1020 eV, and they may be the sources of UHECRs.
Maximum Principle for Stochastic Recursive Optimal Control Problems Involving Impulse Controls
Zhen Wu,Feng Zhang
Abstract and Applied Analysis , 2012, DOI: 10.1155/2012/709682
Abstract: We consider a stochastic recursive optimal control problem in which the control variable has two components: the regular control and the impulse control. The control variable does not enter the diffusion coefficient, and the domain of the regular controls is not necessarily convex. We establish necessary optimality conditions, of the Pontryagin maximum principle type, for this stochastic optimal control problem. Sufficient optimality conditions are also given. The optimal control is obtained for an example of linear quadratic optimization problem to illustrate the applications of the theoretical results.
The Analysis of Epidemic Network Model with Infectious Force in Latent and Infected Period
Juping Zhang,Zhen Jin
Discrete Dynamics in Nature and Society , 2010, DOI: 10.1155/2010/604329
Abstract: We discuss the epidemic network model with infectious force in latent and infected period. We obtain the basic reproduction number and analyze the globally dynamic behaviors of the disease-free equilibrium when the basic reproduction number is less than one. The effects of various immunization schemes are studied. Finally, the final sizes relation is derived for the network epidemic model. The derivation depends on an explicit formula for the basic reproduction number of network of disease transmission models. 1. Introduction Disease spreading has been the subject of intense research since long time ago. With the advent of modern society, fast transportation systems have changed human habits, and some diseases that just a few years ago would have produced local outbreaks are nowadays a global threat for public health systems. A recent example is given by influenza A(H1N1). In order to understand the mechanism of diseases spreading and other similar processes, such as rumors spreading, networks of movie actor collaboration and science collaboration, WWW, and the Internet, it is of great significance to inspect the effect of complex networks features on disease spreading. Therefore, it is of utmost importance to carefully take into account as much details as possible of the structural properties of the network on which the infection dynamics occurs. And in the general case, the epidemic system can be represented as a network where nodes stand for individuals and an edge connecting two nodes denotes the interaction between individuals. The degree of a node is the number of its neighbors, that is, the number of links adjacent to the node. In the past, researchers mainly focused the disease transmission study on the conventional networks [1, 2] such as lattices, regular tree, and ER random graph. Since late 1990s, scientists have presented a series of statistical complex topological characteristics [3–6] such as the small-world (SW) phenomenon [7] and scale-free (SF) property [8] by investigating many real networks. On scale-free networks, it was assumed that the larger the node degree, the greater the infectivity of the node, and the infectivity is just equal to the node degree. Under such an assumption, for instance, Pastor-Satorras et al. concluded that the epidemic threshold for heterogenous networks with sufficiently large size [9]. Subsequently, the studies of dynamical processes on complex networks also have attracted lots of interests with various subjects [10–15], and as one of the typical dynamical processes built on complex networks, epidemic
Workspace Representation and Optimization of a Novel Parallel Mechanism with Three-Degrees-of-Freedom
Zhen Gao,Dan Zhang
Sustainability , 2011, DOI: 10.3390/su3112217
Abstract: The development of a new parallel mechanism based on simulation driven design is a rapid approach to discover the unique features or advantages of a conceptual model. In this research, one novel parallel mechanism which can generate three degrees-of-freedom translations is proposed. The kinematic model and Jacobian matrix is derived. The workspace generation and mapping is investigated based on simplified boundary searching method. The particle swarm algorithm is applied to search for the optimal volume of workspace.
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