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Search Results: 1 - 10 of 23744 matches for " Hongtao Shi "
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Experimental Research on Spontaneous Combustion Tendency of High Volatile Blended Coals  [PDF]
Jinfeng Ma, Fei Shao, Junrui Shi, Zhijia Xue, Shuqun Wang, Hongtao Li, Huangxin Zhang
Engineering (ENG) , 2013, DOI: 10.4236/eng.2013.53042
Experiment of oxidation characteristics with slow velocity of high volatile blended coals was investigated in the surroundings of low oxygen conditions, which gives three kinetic factors in the step of low temperature through the methods of thermo gravimetric analysis, the Coats-Redfern integration and Achar-Brindley-Sharp-Wendworth. The results of calculation show that activation energy and pre-exponential factor increase with the reaction process, and tendency of spontaneous combustion of the blended coal have changed. The experimental results show that the type of absorbing oxygen is mainly physical adsorption and calorific value is very small during increasing weight. Volatile of blended coal releases before single coal and combustion temperature of blended coal is between one and other single coals. If the oxygen content is below 16% in the milling system, explosion-proof effect on high volatile blended coal can be obtained.
Application of Wavelet Transform in MCG-signal Denoising
Yucai Dong,Hongtao Shi,Junzhi Luo,Gehua Fan
Modern Applied Science , 2010, DOI: 10.5539/mas.v4n6p20
Abstract: In this paper, the principle of denoising with wavelet transform are discussed. The application of wavelet threshold denoising method in MCG-signal processing problem is introduced. Program is written by MATLAB to realize wavelet threshold denoising method. The results show that the wavelet threshold denoising method in the MCG-signal denoising can not only restrain the noise effectively, but also reserve the fault character information in the original signal. The signals by this method are better improvements than traditional method.
Teaching Eect Assessment Method of Basis Courses in Engineering Institutions Based on Homogeneous Markov Chain
Yucai Dong,Weidong Li,Hongtao Shi,Ling Zhang
Journal of Mathematics Research , 2010, DOI: 10.5539/jmr.v2n1p89
Abstract: Using Markov chain model and by the changes of state transition about system, this paper describes the dynamic characteristics of teaching method of the basis course in the engineering institutions, which reflects the management of institutions and eect of teaching and learning.
Study of FAE Explosive Image Analysis Based on the Fractional Dimension
Yucai Dong,Hongyan Li,Hongtao Shi,lianghai Yi
Journal of Mathematics Research , 2009, DOI: 10.5539/jmr.v1n1p102
Abstract: The method of box dimension is used in this paper for calculating the fractal dimension of the fuel air explosive( FAE) explosive images. The relationship between fractal dimension and the expansion law of fireball is discussed. The change of explosion image fractal dimension all the time is studied, and its change law is inferred, with the reason analyzed, which lays the foundation for the further study of explosive process.
The Extraction of the FAE Image Profilogram Based on the Grey Level Thresholding
Ling Zhang,Yucai Dong,Hongtao Shi,Ping Chen
Computer and Information Science , 2010, DOI: 10.5539/cis.v4n1p68
Abstract: The profilogram of FAE (fuel-air explosive) fuel explosion image is the important base to analyze the explosion process. In this article, the double peak method, the iteration method, the OTSU method, and the maximum entropy criterion method are respectively used to confirm the threshold, and extract and compare the profilograms of the FAE fuel explosion image, which could establish the base for the further experiment analysis.
Study on the Route Optimization of Military Logistics Distribution in Wartime Based on the Ant Colony Algorithm
Hongtao Shi,Yucai Dong,Lianghai Yi,Dongyun Zheng
Computer and Information Science , 2010, DOI: 10.5539/cis.v3n1p139
Abstract: Because of the impacts from the road conditions and the hostile attacking, the military logistics distribution in wartime should consider the pressure degrees of various demand points to the materials, so it is much more complex than the common logistics. Aiming at the actual situation of the military logistics distribution in wartime, the basic ant colony algorithm is improved in the article, and the software of MATLAB is used to simulate the improved algorithm. The result indicates that the algorithm possesses higher solving efficiency, and can fulfill the requirement of the route optimization of the military logistics distribution in wartime.
Single-Channel Compressive Sensing for DOA Estimation via Sensing Model Optimization  [PDF]
Hongtao Li, Zeshi Yuan
Int'l J. of Communications, Network and System Sciences (IJCNS) , 2017, DOI: 10.4236/ijcns.2017.105B019
The performance of multi-channel Compressive Sensing (CS)-based Direction-of-Arrival (DOA) estimation algorithm degrades when the gains between Radio Frequency (RF) channels are inconsistent, and when target angle information mismatches with system sensing model. To solve these problems, a novel single-channel CS-based DOA estimation algorithm via sensing model optimization is proposed. Firstly, a DOA sparse sensing model using single-channel array considering the sensing model mismatch is established. Secondly, a new single-channel CS-based DOA estimation algorithm is presented. The basic idea behind the proposed algorithm is to iteratively solve two CS optimizations with respect to target angle information vector and sensing model quantization error vector, respectively. In addition, it avoids the loss of DOA estimation performance caused by the inconsistent gain between RF channels. Finally, simulation results are presented to verify the efficacy of the proposed algorithm.
Discussion on the Key Issues of Strategic Management of Corporate Social Responsibility in China  [PDF]
Jing Li, Hongtao Guo
Open Journal of Business and Management (OJBM) , 2018, DOI: 10.4236/ojbm.2018.64069
The main reason for the unsatisfactory performance of Chinese corporate social responsibility practice is that corporate managers still have different degrees of misunderstanding about corporate social responsibility. It is of great significance to clarify the existing problems in the management of corporate social responsibility and put forward scientific strategic management methods of corporate social responsibility.
An Efficient Synthesis of Novel Dispirooxindole Derivatives via One-Pot Three-Component 1,3-Dipolar Cycloaddition Reactions
Zhibin Huang,Qian Zhao,Gang Chen,Huiyuan Wang,Wei Lin,Lexing Xu,Hongtao Liu,Juxian Wang,Daqing Shi,Yucheng Wang
Molecules , 2012, DOI: 10.3390/molecules171112704
Abstract: A series of novel dispirooxindoles have been synthesized through three-component 1,3-dipolar cycloaddition of azomethine ylides generated in situ by the decarboxylative condensation of isatin and an α-amino acid with the dipolarophile 5-benzylidene-1,3-dimethylpyrimidine-2,4,6-trione. This method has the advantages of mild reaction conditions, high atom economy, excellent yields, and high regio- and stereo-selectivity.
Monitoring the Radiation Injury of Red Blood Cells to Micowave Radiation with Different Power Density  [PDF]
Junguang Yong, Ping Ruan, Hongtao Shen
Engineering (ENG) , 2013, DOI: 10.4236/eng.2013.510B092

Multiple state-of-the-art techniques, such as multi-dimensional micro-imaging, fast multi-channel micro-spetrophoto-metry, and dynamic micro-imaging analysis, were used to dynamically investigate various effects of cell under the 900MHzelectromagnetic radiation. Cell changes in shape, size under different power density electromagnetic waves radiation were presented in this paper. Experimental results indicated that the isolated human red blood cells (RBCs) do not have obviously real-time responses to the ultra-low density (15 μW/cm2, 31 μW/cm2) electromagnetic wave radiation when the radiation time is not more than 30 minutes; however, the cells do have significant reactions in shape, size to the electromagnetic waves radiation with power densities of 1 mW/cm2and 5 mW/cm2. The data reveals the possible influences and statistical relationships among living human cell functions, radiation amount and exposure time with high-frequency electromagnetic waves. The results of this study may be significant on protection of human being and other living organisms against possible radiation affections of the high-frequency electromagnetic waves.

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