Advanced Materials Research Vols. 282-283

Abstract: Based on entrepreneurial business growth Timmons (2004) and entrepreneurship education research results, focused on initial stage of entrepreneurship firms’ characteristics, the paper put forward a system of entrepreneurship education, and design the corresponding teaching program finally. This study has a certain reference value of optimization of current entrepreneurship education system to improve entrepreneurial talent.

Abstract: Based on the concept of dynamic capabilities(Teece,1997), the paper used three dimensions to interpret the dynamic capabilities for entrepreneurship, then built Structural Equation Model(SEM) to quantitatively study the relationships between dynamic capacities and entrepreneurship performance. The study found that the leadership as the element of the dynamic capabilities for entrepreneurship played the most important role for high performance.

Abstract: Failure in transformers could be caused by the corrosive sulfur in their oil. Preliminary studies on the test of corrosive sulfur in transformer oil and temperature are performed. The comparison among their results of their typical test methods for corrosive sulfur is discussed. It is illustrated that the corrosive-sulfur sensitivity is varied with the test conditions. Temperature is the important factor for the reaction of corrosive sulfur with copper. We have done experiments of specimen immersing and mercaptan content in oil, so we can confirm that high temperature enhances the reaction.

Abstract: Many scholars have too much ignored the studies on the hand spinning wheel in ancient China, they drew some wrong conclusions based primarily on the hand spinning wheel in a copy of the mural painting collected by Mr. Liu Xianzhou. We aim to explain the history of hand spinning wheel in ancient China objectively. We made a complete investigation on the image information on the hand spinning wheel from the art works of the Han Dynasty, at the same time we analyzed referenced materials about the hand spinning wheel in ancient China. It is concluded that the mural painting itself is a counterfeit, and the process of shape changes of the hand spinning wheels in ancient China experienced three stages: the finger spinning wheel rotated by the spokes, the crank spinning wheel rotated by the spokes, the hand spinning cord wheel.

Abstract: Results of an experimental and theoretical analysis of the proprerties of a LD pumped laser using a plano-concave stable resonator and KTP frequency-doubling crystal material are presented. The influence of thermal lens effect on laser output mode and beam quality has been discussed briefly by using the transfer matrix theory. In this paper, further experiment on the output beam quality of a LD pumped acousto-optic Q-switched laser has been also performed by adopting Hartmann-Shack wavefront sensor and Zernike mode reconstruction theory. Using this method, the PV and RMS values of the aberration wavefront, the frontal 35-order Zernike aberrations can be acquired, and the Strehl ratio curve of the output beam and the distribution of circle energy can also be obtained by calculation, so the mode properities can be fully understood. The experimental results show that the beam wavefront aberration is mainly concentrated in the frontal 15 orders of Zernike aberration, mainly including the defocus A₃, the low-order astigmatism A₄ and A₅, and the coma aberration A₆ and A₇ because of crystal thermal effect.

Abstract: This paper describes the history and development of botanical pesticides, analyze the active ingredients of plant pesticide and the application in pest control and with the work practice make ​​a proper study on the future development of botanical pesticides, in order to promote the development of botanical pesticides, developed more and better economic, efficient and pollution-free new pesticides, the benefit of mankind.

Abstract: The influences of extract from Lactarius vellereus fermentation liquid on antioxidant enzymes activity of Alternaria alternata K. were evaluated. Results showed that, in treatment group, the activities of SOD, CAT and POD in mycelia of A. alternata increased at prophase, and SOD activity increased to maximum (31.562 U·g^-1) at 5h, while both CAT and POD activity increased to maximum (0.041U·g^-1·s^-1 and 5.531U·g^-1·min^-1, respectively) after being administered with 10h. The activities of these three enzymes treated with extract decreased rapidly at anaphase and down to the minimum (0.828 U·g^-1, 0.012 U·g^-1·s^-1, and 0 U·g^-1·min^-1, respectively) at 40h. While, in control group, SOD, CAT and POD activity always increased with treatment time prolonged. The activity of SOD, CAT and POD was affected by Lactarius vellereus fermentation liquid extract so that it led to dysfunction of the free radical scavenging system. This might be one of the mechanisms that the extract inhibits the growth of A. alternata.

Abstract: In this work, the one dimensional simulation program called analysis of microelectronic and photonic structures (AMPS-1D) is used to study the performances of depth of AlxGa1-xN/GaN heterojunction quantum well. The calculated results of AMPS-1D software show that the effect of different Al composition on the depth of AlxGa1-xN/GaN heterojunction quantum well is slight. On the other hand, the effect of different doped concentration in AlxGa1-xN is obvious.

Abstract: In this paper, a theoretical calculation of the miscibility gap taking modified interaction parameter and mismatch strain into account are performed for the Mg_xZn_1-xO ternary compound system using the modified strictly regular solution model. The calculated results shows that the Mg_xZn_1-xO alloys are metastable at the temperatures commonly used for crystal growth and the miscibility gap shifts remarkably into the areas of higher Mg concentration and higher temperature because of the interaction parameter modifiability and strain effect. The strain relaxation is discussed synchronously, with the increasing of the strain relaxation, the MgO segregation boundary expands to a bend band region.

Abstract: To identify the pathogen of Mulberry wilt disease, a tested strain WJ-1 was isolated from a naturally infected mulberry in Guangzhou, Guangdong province, P. R. China. Hypersensitive reaction, along with Koch’s postulates, morphological, biochemical and physiological characterization, light microscope observation and molecular identification were performed on WJ-1. The results indicated that WJ-1 was a Gram-negative, short-rod shaped bacterium. Based on morphology and the 16S rRNA gene sequence analysis, WJ-1 strain was identified as members of the genus Enterobacter. The phylogenetic tree revealed that WJ-1 shared the highest homology with Enterobacter cloacae strain M5. It was another evidence on plant disease caused by Enterobacter species. We found that Enterobacter species could cause mulberry wilt disease in Guangzhou.