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Search Results: 1 - 10 of 10074 matches for " Gaojin Qian "
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Facile Synthesis and Thermal Stability of Nanocrystalline Molybdenum Carbide  [PDF]
Youjian Chen, Hong Zhang, Jinfeng Zhang, Jianhua Ma, Hongnan Ye, Gaojin Qian, Yi Ye, Shuang Zhong
Materials Sciences and Applications (MSA) , 2011, DOI: 10.4236/msa.2011.29178
Abstract: Nanocrystalline molybdenum carbide (Mo2C) was prepared via one simple route by the reaction of metallic magnesium powders with molybdenum trioxide and potassium acetate in an autoclave at the condition of 600℃ and 4 h. X-ray powder diffraction (XRD) pattern indicated that the product was hexagonal α-Mo2C, and the cell constant was a = 3.0091 Å, c = 4.7368 Å. Scanning electron microscopy (SEM) image showed that the sample consisted of particles with an average size of about 100 nm in diameter. The product was also studied by the thermogravimetric analysis (TGA). It had good thermal stability and oxidation resistance below 450℃ in air.
Characters of p-nitrophenol sorption in sediments--sorption isotherms and sorption thermodynamics

ZHU Lizhong,YANG Kun,XU Gaojin,

环境科学学报 , 2001,
Abstract: 研究了对硝基苯酚在不同沉积物上的吸附等温线,比较分析了Linear方程、Freundlich方程和Langmuir方程描述吸附等温线的准确性和稳定性结果表明,Iinear方程更适合描述沉积物吸附对硝基苯酚的等温线对硝基苯酚在沉积物上的吸附主要是溶质在沉积物有机质中的分配,其吸附热为-7 8 kJ@mol-1,主要的吸附作用力为疏水键力.对硝基苯酚在18个沉积物有机质上吸附自由能改变量为-5 4--7.2kJ@mol-1.标准自由能的变小是对硝基苯酚在沉积物有机质上吸附的推动力.
User Session-Based Test Case Generation and Optimization Using Genetic Algorithm  [PDF]
Zhongsheng Qian
Journal of Software Engineering and Applications (JSEA) , 2010, DOI: 10.4236/jsea.2010.36062
Abstract: An approach to generating and optimizing test cases is proposed for Web application testing based on user sessions using genetic algorithm. A large volume of meaningful user sessions are obtained after purging their irrelevant information by analyzing user logs on the Web server. Most of the redundant user sessions are also removed by the reduction process. For test reuse and test concurrency, it divides the user sessions obtained into different groups, each of which is called a test suite, and then prioritizes the test suites and the test cases of each test suite. So, the initial test suites and test cases, and their initial executing sequences are achieved. However, the test scheme generated by the elementary prioritization is not much approximate to the best one. Therefore, genetic algorithm is employed to optimize the results of grouping and prioritization. Meanwhile, an approach to generating new test cases is presented using crossover. The new test cases can detect faults caused by the use of possible conflicting data shared by different users.
Web Testing Generation: A Stream X-Machine Based Approach  [PDF]
Zhongsheng Qian
Journal of Software Engineering and Applications (JSEA) , 2012, DOI: 10.4236/jsea.2012.51002
Abstract: To ensure the quality of Web applications, Web testing is one of the effective methods. The testing is a process of revealing errors that is used to give confidence that the implementation of a Web application meets its original specification. This work proposes a Web testing framework based on Stream X-Machines (SXMs), which provides a way to derive test cases for a Web application. It starts from constructing the SXM model, from which a test translator is employed to extract the test paths and then translates them into an XML-style test specification, which is the input of test engine. The test engine generates test cases and then executes them, and finally produces test report. This testing method is a significant contribution to informed research.
A New Version of Special Relativity Absorbed the Uncertainty Principle: Its Content as Well as Application and Experimental Test  [PDF]
Dapeng Qian
Journal of Modern Physics (JMP) , 2014, DOI: 10.4236/jmp.2014.512117

Based on the space spherical symmetry of 3-dimensional and the translational symmetry of time and the uncertainty principle, a 4-dimensional space-time cylinder model of quarks and leptons is established. With this model, equations of the special relativity can be extended more perfectly, thereby achieving a unity of the special relativity and quantum mechanics in deeper level. New equations can not only interpret issues explained by old equations but also solve several important pending problems. For example, a formula to strictly calculate the coefficient ξ of Lorentz invariance violation (LIV) is derived, to above 4 × 1019 eV UHECR protons the calculated |ξ| < 4.5 × 10-30, although there is the LIV effect it is too weak to change the GZK cutoff, which is consistent with observations of HiRes and Auger; Also, a relation formula between the Hubble constant and several basic constants is derived, thus theoretically calculated H0 = 70.937 km·s-1·Mpc-1, which is well consistent with the final observation result of HST Key Project. In addition, an unusual effect predicted by new equations can be experimentally tested in the electron storage ring; a preliminary experiment result has hinted its signs of existence.

What Is Detection?  [PDF]
Sen Qian
Detection (Detection) , 2014, DOI: 10.4236/detection.2014.22002
Abstract: “Detection”, literally, in English, is the extraction of particular information from a larger stream of information without specific cooperation from or synchronization with the sender. In Chinese, detection means inspection and measurement of the object or phenomenon, which couldn’t be directly observed, with apparatus, such as detecting space and the depth of the sea.
Research on Location-Routing Problem with Empirical Analysis for Regional Logistics Distribution  [PDF]
Qian Zhang
Applied Mathematics (AM) , 2014, DOI: 10.4236/am.2014.515224

The location of the distribution facilities and the routing of the vehicles from these facilities are interdependent in many distribution systems. Such a concept recognizes the interdependence; attempts to integrate these two decisions have been limited. Multi-objective location-routing problem (MLRP) is combined with the facility location and the vehicle routing decision and satisfied the different objectives. Due to the problem complexity, simultaneous solution methods are limited, which are given in different objectives with conflicts in functions satisfied. Two kinds of optimal mathematical models are proposed for the solution of MLRP. Three methods have been emphatically developed for MLRP. MGA architecture makes it possible to search the solution space efficiently, which provides a path for searching the solution with two-objective LRP. At last the practical proof is given by random analysis for regional distribution with nine cities.

Research on Cultural Supply Chain Integration and Invocation  [PDF]
Qian Zhang
Social Networking (SN) , 2014, DOI: 10.4236/sn.2014.34025

Supply chain management is an integrated management method for solving these effective problems which were integrated in existing resources with the overall competitiveness and theirs effects. The supply chain integration and innovation models are proposed with the development and current situation for these global Chinese businessmen. The supply chain integration is given in order to optimize for the culture of Chinese business management. It is established that these practice network platform for supply chain management are presented service for Chinese businessmen. And they are realized these integration innovation in the logistics system, financial system, Chinese business culture system, production manufacturing system, and customer service system. These suggestions are provided for the development of Chinese business culture in supply chain theory. These further forward Chinese culture are given some fruitful reference for con- structing a new development for the world Chinese businessmen’s culture management.

Image Denoising Combining the P-M Model and the LLT Model  [PDF]
Qian Yang
Journal of Computer and Communications (JCC) , 2015, DOI: 10.4236/jcc.2015.310003
Abstract: In this paper, we present a noise removal technique by combining the P-M model with the LLT model. The combined technique takes full use of the advantage of both filters which is able to preserve edges and simultaneously overcomes the staircase effect. We use a weighting function in our model, and compare this model with the P-M model as well as other fourth-order functional both in theory and numerical experiment.
A Comparative Study of the Effect of Interlocking Directorates on Merger Target Selection under Different Merger and Acquisition Modes  [PDF]
Qian Zhang
American Journal of Industrial and Business Management (AJIBM) , 2016, DOI: 10.4236/ajibm.2016.63023
Abstract: This paper, taking the directors of listed companies as point of penetration, studies the effects of interlocking directorates on the company’s merger decisions. With a focus on interlocking directorates’ influence on the selection of M & A targets, a Probit regression test was conducted by pairing potential M & A targets to real acquisition sample according to the industry of the real sample. The innovation of this paper lies in the study of whether there is a significant difference in the effect of interlocking directorates through differentiating various M & A modes, including horizontal mergers, vertical mergers and mixed mergers. The empirical analysis concludes that when there are interlocking directorates in merger company and potential target company, it is more likely for the potential target to be the object company. What’s more, by comparison, when the acquiring company and the target company are from different industries, there is greater impact of interlocking directorates, and the effects are stronger in vertical mergers than in mixed mergers and horizontal mergers.
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