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Search Results: 1 - 10 of 58938 matches for " Xiuzhi Yang "
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Finite Element Simulation of Thermal Field in Double Wire Welding  [PDF]
Xiuzhi Yang, Chunjie Yang, Chunfa Dong, Xinhua Xiao, Wenlin Hua, Xiangjie Wang
Journal of Materials Science and Chemical Engineering (MSCE) , 2016, DOI: 10.4236/msce.2016.412002
Abstract:
In this paper, the thermal field of double wire welding is simulated by using ANSYS software. Simulation results were shown that the total heat input (E) is the most significant parameters to change the value of t8/5; By the mean of rationally controlling the proportion of the front arc heat input (E1) in the total heat input (E) and appropriately selecting double wire spacing (L), It is effective means to get the double wire welding thermal cycle. By the way of simulation, it is possible to manage the thermal input in the double welding wires and to control the temperature field and cooling rate that are fundamental for the final joint quality, it is great importance guidance to optimize the double wire welding process parameters.
Strategic Analysis of Synergistic Effect on M&A of Volvo Car Corporation by Geely Automobile  [PDF]
Zhou Xia, Xiuzhi Zhang
iBusiness (IB) , 2011, DOI: 10.4236/ib.2011.31002
Abstract: Strategic M&A is focused on the development of enterprises within the same industry or related industries and has multiple effects such as economies of scale, structural integration of upstream and downstream industry chain, powerful alliances and complementary advantages. A major motivation of strategic M&A is the synergistic effect. In the upsurge of M&A at home and abroad, failed to achieve the synergistic effect is one of the important reasons of a high failure rate of M&A. This paper probes into the example of Geely Automobile’s M&A of Swedish Volvo Car Corporation in March 2010 from a strategic angle by analyzing the strategic decision-making, the competitive environment, the me-chanism of action, the evaluation and the realization risks of the synergistic effect, thus to provide references for the M&A practice of Chinese enterprises.
Preparation, Characterization and Adsorption Performance of a Novel Anionic Starch Microsphere
Yati Yang,Xiuzhi Wei,Peng Sun,Juanmin Wan
Molecules , 2010, DOI: 10.3390/molecules15042872
Abstract: Neutral starch microspheres (NSMs) were synthesized by an inverse microemulsion technology with epichlorohydrin as a crosslinker and soluble starch as starting material. Anionic starch microspheres (ASMs) were prepared from NSMs by the secondary polymerization with chloroacetic acid as the anionic etherifying agent. Fourier transform infrared spectroscopy (FT-IR), scanning electron microscopy (SEM) and laser diffraction particle size analyzer were used to characterize the anionic starch microspheres. The results showed that structure of the microspheres was compact and the hardness of microspheres was great, and the average diameter of the product was about 75 μm. The anionic starch microspheres (ASMs) were used to adsorb methylene blue (MB) from aqueous solution. Effects of adsorption time, initial concentration of MB, and temperature on the adsorption of MB onto ASMs were studied, and the equilibrium and kinetics of the adsorption process were further investigated. It shows that ASMs can effectively remove MB from the solution. The adsorption equilibrium data correlates well with the Langmuir isotherm model compared with Frendlich isotherem model. The pseudo-first-order and pseudo-second-order kinetic models were applied to test the experimental data. The pseudo-second-order kinetic model provided a better correlation of the experimental data in comparison with the pseudo-first-order model. Temperature variations did not significantly affect the adsorption of MB onto ASMs.
Improved ethanol, acetone and H2 sensing performances of micro-sensors based on loose ZnO nanofibers
XiuZhi Wang
Chinese Science Bulletin , 2012, DOI: 10.1007/s11434-012-5431-5
Abstract: Both one-dimensional nanostructures and porous nanostructures are benefit to the sensing enhancement of semiconducting functional materials. The present paper shows an effective route to combining the advantages of these two nanostructures for a novel type of ZnO nanomaterials. Basically, a pore-forming material is employed in an electrospinning method, and the products are characterized by X-ray powder diffraction (XRD), energy dispersive X-ray spectroscopy (EDX), and transmission electron microscopy (TEM). The obtained materials are loose ZnO nanofibers, which own both porous and one-dimensional nanostructures. Micro-sensors are fabricated by sputtering and etching techniques, and the as-prepared nanofibers are used as the functional materials in them. The sensors show improved sensing properties both in sensitivity and response-speeds. The sensitivity is enhanced from 4 to 8 and the response time is shortened from 14 to 10 s when the sensors are exposed to 100 μL/L ethanol at 260°C. Similar results are also observed in acetone and H2 sensing tests. These enhancements are based on the one-dimensional and porous nanostructures of the nanofibers.
Conceptual Metaphor Theory and Teaching of English and Chinese Idioms
Xiuzhi Li
Journal of Language Teaching and Research , 2010, DOI: 10.4304/jltr.1.3.206-210
Abstract: This paper talks about the relationship between conceptual metaphor and semantic motivation of English and Chinese idioms from three aspects, namely, structural metaphor, orientation metaphor and ontological metaphor. Based on that, the author puts forward applying conceptual metaphor theory to English and Chinese idiom teaching.
A Comparative Analysis of English and Chinese Idioms— From the Perspective of Conceptual Metaphor of “Happiness”
Xiuzhi Li
Journal of Language Teaching and Research , 2010, DOI: 10.4304/jltr.1.4.473-476
Abstract: A comparative analysis of English and Chinese idioms is made from the perspective of conceptual metaphor of “happiness”. By comparison, similar and different metaphors and metaphoric idioms in conceptualizing “happiness” are detected at first. Moreover, the reasons for the differences and similarities mentioned above derive from different thinking modes and cultural models.
RELATIVE VELOCITIES OF LARGE PARTICLES SUSPENDED IN A VERTICAL TURBULENT LIQUID FLOW
垂直湍流液-固流中大颗粒的相对速度

Lu Zhanmin,Yang Xiuzhi,
路展民
,杨秀芝

力学学报 , 1999,
Abstract: A dimensionless formula for estimating the time-mean velocity differences between fluid and large particles has been given. The Particles are suspended in a homogeneous turbulent liquid flow. and their sizes are larger than the size of the micro-eddy of the turbulent liquid flow.A comparison between the orders of the accelerations of the eddy and the gravity shows that in a flow with considerable high Reynolds number, the dynamic force of eddy is dominant and the influence of the gravity to the motion of the particles can be ignored, on the other hand, in a flow with sufficiently low Reynolds number, the gravity is dominant and the influence of the dynamic force of eddy to the motion of the particles can be ignored. By combining these two situations,it is possible to predict theoretically the general form of the dimensionless relationship between the relative Reynolds number of the large particles and the other four dimensionless numbers.In addition to the dimensional analysis, experimental measurements are provided, the coefficient and the powers of the dimensionless numbers in the formula have been determined and examined by the results of the measurements. The experiments are carried out in a pipe water flow with suspended particles, for different set of the experiments, the densities and sizes of the particles are different. Measurements of two-phase velocities in the pipe center have been made by using two phase velocity separation technique of LDV. It is shown that the relative velocity depends on the relative size of the particle to the liquid flow with a power of 1.25, and strongly depends on the Reynolds number of the fluid flow with a power approaching to 1.5 for rather high fluid flow Reynolds numbers.
Research on the Development of Management Accounting in Small and Medium-Sized Enterprises in China  [PDF]
Bingxin Du, Jiaxu Jiang, Xiuzhi Ji
Open Journal of Accounting (OJAcct) , 2018, DOI: 10.4236/ojacct.2018.71002
Abstract:
In the early 20th century, management accounting was created with Taylor’s theory of scientific management. Management accounting is a continuous improvement process that provides value added value, design, measure and manage financial and non-financial information systems for enterprises. This process directs the management actions, motivates behaviour, supports and creates cultural values, which are needed to achieve organizational strategy, tactics and business objectives. The research and application of management accounting in China started late. It started in the late 1970s and early 1980s. During the period of about 30 years, management accounting has made great progress in both theory and practice. Many facts have proved that China’s management accounting has gradually shifted from quantity and quota management to management of cost and value, and from project and department management to comprehensive and strategic management. In recent years, with the implementation of fiscal policies such as department budget, investment review and performance appraisal, “comprehensive budget”, “zero-base budget”, “budget control”, “responsibility assessment” and other modern management accounting theories and methods have been applied in various enterprises in China. But the time that management accounting is formed and developed in China is not long after all. There are many defects and deficiencies in China’s management accounting. The theoretical structure, scope of research and practical application of management accounting are to be improved and enriched, and there is still considerable space for development. The problem is more serious in small and medium-sized enterprises [1]. This paper studies the current development status of management accounting in small and medium-sized enterprises and factors that affect the management accounting in the small and medium-sized enterprises, then proposes solutions to meet the development needs of management accounting in small and medium-sized enterprises.
Influence of Silica Fume on the Reflectivity and Transmission Efficiency of Cement-Based Materials  [PDF]
Xiuzhi Zhang, Guodong Zhang, Yu Zhang, Zonghui Zhou
Journal of Applied Mathematics and Physics (JAMP) , 2014, DOI: 10.4236/jamp.2014.29094
Abstract:

As a kind of mineral admixture, silica fume has low permittivity, which will affect the electromagnetic properties of cement-based materials. To study the effect of silica fume on the properties of cement-based materials, the reflectivity, transmission efficiency and pore structure were analyzed by using the vector network analyzer and mercury injection apparatus. Results show that silica fume can make the mortar more compact and the porosity of sample with 9% silica fume is only 17.8%, which is far lower than the control sample; With the increase of the silica fume content, the peak of reflectivity curve increases from -23.2 dB to -16.0 dB, and then decreases from -16.04 dB to -28.7 dB in the frequency range of 6 – 18 GHz. Reflectivity of sample with 3% content of silica fume is lower than other samples within 26.5 - 40 GHz; Transmission efficiency of samples shows the trend of increase with silica fume content increases from 0% to 6% within 8.2 - 12.4 GHz, 12 - 18 GHz and 26.5 - 40 GHz, but when the content increases from 6% to 9%, the transmission efficiency of samples reduces.

Application of gyrB in the identification of closely related bacteria-A review
促旋酶(gyrase) B亚单位基因gyrB在鉴别细菌近缘种中的应用

Xianmei Li,Xiaofen Wang,Hongyan Yang,Xiuzhi Gao,Zongjun Cui,
李献梅
,王小芬,杨洪岩,高秀芝,崔宗均

微生物学报 , 2008,
Abstract: The single-copied gyrB gene, encoding the subunit B of gyrase and distributing universally in all bacteria, has the average substitution rate of 0.7%-0.8% per million years. It's proved that this region could be used to discriminate and identify the closely related species of different bacteria such as Pseudomonoas, Bacillus, Vibrio, Enterobacteriaceae, Mycobacteria, Aeromonas, Lactic acid bacteria et.al. It also can be used of quantitative or restriction fragment analysis of bacteria with the aid of species-specific primers or combined with DGGE (denaturing gradient gel electrophoresis). It really brings new promise for the identifying closest isolates or fingerprinting population due to overcoming the shortage of undistinguishing them acutely with the non-protein-encoding genes such as 16S rDNA or ITS (internal transcribed spacer) DNA. It's an important new molecular marker for researches of closely related species and becoming an attractive topic in current microbial research world.
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