OALib Journal期刊

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匹配条件: “ZHAO Hai” ,找到相关结果约45581条。
An Energy Balanced Reliable Routing Metric in WSNs  [PDF]
Jian ZHU, Hai ZHAO, Jiuqiang XU
Wireless Sensor Network (WSN) , 2009, DOI: 10.4236/wsn.2009.11004
Abstract: In WSNs’ applications, not only the reliable end-to-end communications are must be ensured, but also the reduction of energy consumption and the entire network’s lifetim e should be optimized. All of the above have become to be an important way to evaluate the performance of routing protocols. In this paper, an op-timization model for WSNs’ lifetime is firstly advanced. Secondly, the shortage of ETX based routing metric is solved with the help of the optimization model. Thirdly, an energy balanced routing metric is advanced which is called EBRM in this paper. The result of simulation in NS-2 shows that, the EBRM metric can not only prolong the network’s lifetime, but also can ensure the reliable end-to-end communication.
An Web Client System Design and Implementation for IOS Platform  [PDF]
Haixia Peng, Hai Zhao, Chuan Lin
Journal of Software Engineering and Applications (JSEA) , 2013, DOI: 10.4236/jsea.2013.61006

For current physical examination and medical institutions, the majority of Medical projects need a long time to get the result, this wastes user too much time. In order to solve this problem, this paper presents a program to achieve viewing the results of examination anytime or anywhere with the help of cell phone applications software. The program proposed to solve the problem that user have to wait for the medical test results for a long time and cause the time waste, compared to the programs which using e-mail, SMS and mailing report card to inform the user the results, this one is to be more efficient, while also better meet user and medical institutions requirements. In addition, in order to test the practicality and feasibility of the program, with IOS devices as the material basis, this paper constructs a Web client system, based on the GPRS technology, we can realize the data communications between the Web server and a client which is the workbench IOS devices. Through testing, we can proof this Web client system has certain practical and development value, with the physical examination institutions become popular gradually, I believe that this design ideas of the system will be used extensively in the medical system, and also will bring a person more convenient.

Isolation and properties of an extremely thermophilic xylanolytic bacterium
Anming Li,Hai Zhao
Science China Life Sciences , 1998, DOI: 10.1007/BF02882887
Abstract: A strain of extremely thermophilic, anaerobic, xylanolytic bacterium was isolated from the hot spring in Kangding County, Sichuan Province, and it was gram-reaction negative, immobile, non-sporeformative with its cells arranged single or in pairs, 0.7–1.0 μm wide and 2.0–5.0 μm long. After being cultured at 75C for 3 d on xylan agar rolling tube, its colonies were rounded, convex, smooth in margin and transparent, and could not produce pigments, but could produce carbon dioxide, hydrogen, lactic acid, acetic acid and trace ethanol during the fermentation of xylan.
catena-Poly[1-[(2-fluorobenzylidene)amino]quinolinium [plumbate(II)-tri-μ-iodido]]
Hai-Rong Zhao
Acta Crystallographica Section E , 2012, DOI: 10.1107/s1600536811051853
Abstract: The title complex, {(C16H12FN2)[PbI3]}n, consists of 1-[(2-fluorobenzylidene)amino]quinolinium cations and a polymeric PbI3 anion formed by face-sharing PbI6 octahedra. These octahedra form straight and regular infinite chains along the b axis. In the asymmetric unit, one cation and one anionic [PbI3] fragment are observed in general positions. Polymeric chains are produced by the glide plane perpendicular to the a axis.
An Improved BA Model for Router-level Internet Macroscopic Topology
IAENG International Journal of Computer Science , 2009,
Research on Feature Extraction for Character Recognition of NaXi Pictograph
Hai Guo,Jingying Zhao
Journal of Computers , 2011, DOI: 10.4304/jcp.6.5.947-954
Abstract: Character recognition is one of important applications for pattern recognition. Feature extraction is the most important problem in character recognition. In this paper, we have researched on feature extraction for character recognition of NaXi pictograph. The characteristics of NaXi pictograph are firstly analyzed. Four kinds of features, including permeability number, coarse grid, directional line element, and invariant moments, and 6 kinds of computation distances, including Lidean distance, Standardized Euclidean distance, Minkowski metric, Chebychey distance, City distance, and Correlation distance will be applied to classify characters of NaXi pictograph, based on its characteristics. We have built a sample database containing 21000 samples for 2120 NaXi characters. The results of experiments suggest that coarse grid and directional element are more suitable for character recognition of NaXi pictograph, while invariant moments is not advisable for this task.
Lorentz-Covariant Theory of Gravity Founded on Inertial Frame of Center of Mass
Hai-Long Zhao
Physics , 2005,
Abstract: We suggest a Lorentz-covariant theory of gravity that is equivalent to general relativity in weak gravitational field. We first derive the mass variation of a body falling freely in static gravitational field based on the principle of equivalence and the mass-energy relation. We then modify the standards of space-time in local gravitational field to keep them consistent with the standards in inertial frame of reference at infinity based on the influence of gravitational field on the light. The metric thus obtained agrees with Schwarzschild metric at first order approximation. The gravitational vector potential produced by a moving gravitational source can be obtained by applying Lorentz transformations in local gravitational field. Although inertial and non-inertial frames are equally valid in describing the motion of bodies in gravitational field, we still regard inertial frame, i.e. center of mass of the system, as the preferred frame of reference. This is because Newton's laws of motion only hold for inertial frames. The apsidal motion of binary system and the expansion of the universe can be explained more reasonably when observed from their respective centers of mass than that from relative motions. The expression of static metric in our theory does not contain gravitational radius, thus black hole and singularity do not exist. In our theory, the gravity in the presence of matter is the same as that in the vacuum, i.e. TOV equation does not hold. The maximum mass of a neutron star is about five times of solar mass based on our computation.
On the Implication of Bell's Probability Distribution and Proposed Experiments of Quantum Measurement
Hai-Long Zhao
Physics , 2009, DOI: 10.1134/S1063776113140070
Abstract: In the derivation of Bell's inequalities, probability distribution is supposed to be a function of only hidden variable. We point out that the true implication of the probability distribution of Bell's correlation function is the distribution of the joint measurement outcomes on the two sides. So it is a function of both hidden variable and settings. In this case, Bell's inequalities fail. Our further analysis shows that Bell's locality holds neither for dependent events nor for independent events. We think that the measurements of EPR pairs are dependent events, thus violation of Bell's inequalities cannot rule out the existence of local hidden variable. In order to explain the results of EPR-type experiments, we suppose that polarization entangled photon pair can be composed of two circularly or linearly polarized photons with correlated hidden variables, and a couple of experiments of quantum measurement are proposed. The first uses delayed measurement on one photon of the EPR pair to demonstrate directly whether measurement on the other could have any non-local influence on it. Then several experiments are suggested to reveal the components of polarization entangled photon pair. The last one uses successive polarization measurements on a pair of EPR photons to show that two photons with a same quantum state will behave in the same way under the same measuring condition.
Explanation of Superluminal Phenomena Based on Wave-Particle Duality and Proposed Optical Experiments
Hai-Long Zhao
Physics , 2014,
Abstract: We suggest an explanation for superluminal phenomena based on wave-particle duality of photons. A single photon may be regarded as a wave packet, whose spatial extension is its coherence volume. As photon propagates as a wave train, its velocity is just the speed of light in vacuum. When it tunnels through a barrier as a particle, its wave function collapses and it travels faster than light. But superluminal propagation can only occur within the coherence length, and the duration is constrained by uncertainty principle. On the other hand, a particle with non-vanishing mass cannot travel faster than light. So superluminal phenomena do not violate causality. We explain the principles of existing superluminal experiments and propose three types of experiments to further verify superluminal phenomena. The first is to show that a single photon is equivalent to a wave packet, which occupies certain spatial volume. The second demonstrates that superluminal phenomena can only occur within the coherence length. The third indicates that negative and superluminal group velocity in anomalous dispersion medium is merely a reshaping phenomenon of the pulse, and it will become subluminal at large distances.
Massless neutrino oscillations via quantum tunneling
Hai-Long Zhao
Physics , 2015,
Abstract: In order for different kinds of neutrino to transform into each other, the eigenvalues of energy of neutrino must be different. In the present theory of neutrino oscillations, this is guaranteed by the mass differences between the different eigenstates of neutrino. Thus neutrino cannot oscillate if it is massless. We suggest an explanation for neutrino oscillations by analogy with the oscillation of quantum two-state system, where the flipping of one state into the other may be regarded as a process of quantum tunneling and the required energy difference between the two eigenstates comes from the barrier potential energy. So neutrino with vanishing mass can also oscillate. One of the advantages of the explanation is that neutrino can still be described with Weyl equation within the framework of standard model.

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