Design and Implementation of Business Management System for Library of Wuzhou University

业务管理系统是一种借助先进的设备，使庞大的信息得到有序、高效管理的综合性技术。传统的管理信息模式主要依赖于手工，这已不能对日益膨胀的信息量进行有效管理。业务管理系统凭借着高效的信息处理能力和强大的综合管理能力被越来越多的企业部门开发使用。长期以来，梧州学院图书馆积累了大量的文档信息，仅靠人力的操作不但加重工作人员的负担，增加成本而且效率低下。梧州学院图书馆业务管理系统的开发目标旨在实现学院图书馆信息的自动化管理，实现资源共享，使图书馆的老师、工作人员、学生使用更方便、流畅，有序地管理馆内公文、资料、图书等各方面的信息。 系统基于JavaEE平台，采用SHH组合架构，利用面向对象设计思路进行功...Business management system is a kind of comprehensive technology with advanced equipment, which makes huge information to be orderly and efficient. The traditional management information mode mainly depends on the manual, which cannot effectively manage the growing amount of information. Business management system with high efficiency information processing ability and powerful comprehensive manag...学位：工程硕士院系专业：软件学院_工程硕士(软件工程)学号：X201323103

Research on introduction of Smart Beta products in A-Share Market ——Based on the empirical research of A-share Smart Beta Indexes

指数并不特指具有特定编制方法的指数，其主要是通过对传统市值加权指数在选股和权重分配方面进行优化，在指数化管理的同时，力求相比传统市值加权指数能够产生超额收益，它代表的是对传统投资理念和指数投资理念进行融合的趋势。虽然国外发达市场SmartBeta产品已初具规模，但国内仍处于起步阶段，占指数类产品的整体规模偏低，如何借鉴海外经验并基于A股实践，筛选符合现阶段国内投资者偏好的SmartBeta指数进行产品开发已成为当下国内资产管理机构面临的重大机遇。本文首先梳理指数化投资的理论演变过程，并介绍指数基金的基本概念、分类与评价体系。紧接着分析国内外市场指数产品，尤其是SmartBeta产品发展的历史与...the fusion trend of traditional investment theories and Passive index investment. Although Smart Beta products have taken a significant proportion of index products in overseas market, they are still in their infancy stage in domestic market. How to learn from overseas counterparts and develop some suitable Smart Beat products in accordance with the present stage of A-share market has become a big...学位：工商管理硕士院系专业：管理学院_工商管理硕士(工商管理硕士)学号：1792013115077

海岸带污染物联合毒性的预测及评价

海岸带区域的污染具有内容广泛、状况复杂和管理决策难度较大等特点。由于海岸带环境中的化学污染物往往以混合形式存在,因此单一化学品高剂量暴露下的生态毒性研究结果难以适用于环境中低剂量混合物的生态毒理效应诊断及风险评价。传统的风险评价体系多是在实验室模拟条件下以单一物质的急性或慢性毒性试验为依据,往往很难正确反映实际环境中污染物混合存在时的生态行为及环境危害。随着技术的进步和人类认识能力的进一步提高,研究者们已经聚焦于发展数学模型用以预测及评价化合物的联合毒性。本文对海岸带污染物联合毒性评价的研究进展进行了介绍和展望

Effects of wall temperature on boundary layer stability over a blunt cone at Mach 7.99

Effects of wall temperature on stabilities of hypersonic boundary layer over a 7-degree half-cone-angle blunt cone are studied by using both direct numerical simulation (DNS) and linear stability theory (LST) analysis. Four isothermal wall cases with Tw/T0= 0.5, 0.7, 0.8 and 0.9, as well as an adiabatic wall case are considered. Results of both DNS and LST indicate that wall temperature has significant effects on the growth of disturbance waves. Cooling the surface accelerates unstable Mack II mode waves and decelerates the first mode (Tollmien–Schlichting mode) waves. LST results show that growth rate of the most unstable Mack II mode waves for the cases of cold wall Tw/T0=0.5 and 0.7 are about 45% and 25% larger than that for the adiabatic wall, respectively. Numerical results show that surface cooling modifies the profiles of rdut/dyn and temperature in the boundary layers, and thus changes the stability haracteristic of the boundary layers, and then effects on the growth of unstable waves. The results of DNS indicate that the disturbances with the frequency range from about 119.4 to 179.1 kHz, including the most unstable Mack modes, produce strong mode competition in the downstream region from about 11 to 100 nose radii. And adiabatic wall enhances the amplitudes of disturbance according to the results of DNS, although the LST indicates that the growth rate of the disturbance of cold wall is larger. That because the growth of the disturbance does not only depend on the development of the second unstable mode

Direct numerical simulation of hypersonic boundary layer transition over a blunt cone with a small angle of attack

The direct numerical simulation of boundary layer transition over a 5° half-cone-angle blunt cone is performed. The free-stream Mach number is 6 and the angle of attack is 1°. Random wall blow-and-suction perturbations are used to trigger the transition. Different from the authors’ previous work [Li et al., AIAA J. 46, 2899(2008)], the whole boundary layer flow over the cone is simulated (while in the author’s previous work, only two 45° regions around the leeward and the windward sections are simulated). The transition location on the cone surface is determined through the rapid increase in skin fraction coefficient (Cf). The transition line on the cone surface shows a nonmonotonic curve and the transition is delayed in the range of 0° ≤ θ ≤ 30° (θ = 0° is the leeward section). The mechanism of the delayed transition is studied by using joint frequency spectrum analysis and linear stability theory (LST). It is shown that the growth rates of unstable waves of the second mode are suppressed in the range of 20° ≤ θ ≤ 30°, which leads to the delayed transition location. Very low frequency waves VLFWs� are found in the time series recorded just before the transition location, and the periodic times of VLFWs are about one order larger than those of ordinary Mack second mode waves. Band-pass filter is used to analyze the low frequency waves, and they are deemed as the effect of large scale nonlinear perturbations triggered by LST waves when they are strong enough.The direct numerical simulation of boundary layer transition over a 5° half-cone-angle blunt cone is performed. The free-stream Mach number is 6 and the angle of attack is 1°. Random wall blow-and-suction perturbations are used to trigger the transition. Different from the authors’ previous work [ Li et al., AIAA J. 46, 2899 (2008) ], the whole boundary layer flow over the cone is simulated (while in the author’s previous work, only two 45° regions around the leeward and the windward sections are simulated). The transition location on the cone surface is determined through the rapid increase in skin fraction coefficient (Cf). The transition line on the cone surface shows a nonmonotonic curve and the transition is delayed in the range of 20° ≤ θ ≤ 30° (θ = 0° is the leeward section). The mechanism of the delayed transition is studied by using joint frequency spectrum analysis and linear stability theory (LST). It is shown that the growth rates of unstable waves of the second mode are suppressed in the range of 20° ≤ θ ≤ 30°, which leads to the delayed transition location. Very low frequency waves (VLFWs) are found in the time series recorded just before the transition location, and the periodic times of VLFWs are about one order larger than those of ordinary Mack second mode waves. Band-pass filter is used to analyze the low frequency waves, and they are deemed as the effect of large scale nonlinear perturbations triggered by LST waves when they are strong enough

Catalytic pyrolysis of biomass for the production of phenolic compounds and complexation precipitation extraction of phenols from bio-oil with the study of complexation reaction mechanism

生物质是唯一可转化为液体燃料的可再生资源，生物质快速热解技术能够将各类型农林废弃物转化为称为生物油的液体燃料，因而受到广泛关注。生物油成分复杂，含有数百种化学物质，其中的酚类化合物总量可达到20%以上。因此，若能从生物油中分离出这些酚类物质，不仅可以用来替代工业上主要来自石油的酚类化合物，而且来源更加环保。然而，欲达到从生物油提取酚类的目的，还需要将酚类组分的含量进一步提高，同时降低其它极性较强的非酚组分的种类和含量，以减小后续的提取难度。 通过对多种热解催化剂（包括α-Fe2O3、γ-Fe2O3、ZnO、SiO2、蒙脱土、HZSM-5（Si：Al=25：1）、HZSM-5（Si：Al=50...Biomass is the only renewable resource that can be transformed into liquid fuels. Fast pyrolysis technology has been extensively investigated because it can convert the wastes from agricultural and forestry industry into the liquid fuels called bio-oil. A lot of valuable chemicals can be separated from bio-oil as there are many different components in it. Specifically, the content of phenols in bi...学位：工学博士院系专业：能源学院_能源化工学号：3242013015402

中国南方地区罗非鱼无乳链球菌的分子流行病学研究

从广东省以及海南省等地区养殖的患病罗非鱼体内分离、收集到多株致病菌,经生化分析和分子生物学鉴定,均为无乳链球菌。对这些菌株分别进行了耐药谱测定、分子分型试验以及分子血清型分析。药敏试验结果表明,2007—2010年分离到的无乳链球菌耐药谱基本相似;多位点可变数目串联重复序列分析(MLVA)试验中,选择5个高变异指数的可变数目重复位点(VNTR)进行分子分型,结果表明,所有鱼源无乳链球菌菌株为同一MLVA型,而作为对照的牛源无乳链球菌则明显不同;为了对这些菌株进一步分型,分别进行了分子血清型和表面蛋白抗原基因的检测,结果表明,鱼源无乳链球菌的分子血清型均为Ⅰa型,表面蛋白抗原均为alpha-C蛋白。这进一步说明了不同年份和不同地区的鱼源无乳链球菌在基因水平上为同一分子类型,具有相同的起源或传染源。同时也说明,我国南方地区罗非鱼无乳链球菌在这几年中未发生明显的遗传变异。这些结果为罗非鱼无乳链球菌病疫苗研制,疫病监测及药物防治的研究提供理论依据

Design and optimization of AlGaN tunneling junction

摘要 AlGaN半导体材料作为第三代宽禁带半导体的代表，具有直接带隙宽、原子键强、热导率高、化学稳定性好（几乎不被任何酸腐蚀）以及抗辐照能力强等物理性质，在光电子、高温大功率器件和高频微波器件应用方面有着广阔的前景。仰赖于直接带隙宽，通过调节合金组分，带隙可在3.4至6.2eV的光谱响应范围内调节，有利于能带剪裁，成为工作在紫外到深紫外范围的发光二极管、激光二极管以及探测器等器件的理想材料，受到业界的广泛关注。特别是作为紫外固态光源，相比于同样工作于紫外波段的传统汞灯，AlGaN基紫外光源除了重量轻、体积小以及节能环保外，在工作效率、启动时间、使用寿命、波长单色性和稳定性方面都具有无可比拟的...Abstract AlGaN semiconductors as the third generation wide band gap semiconductor, with superior properties including a wide direct band gap, strong atomic bond, high thermal conductivity, good chemical stability and strong resistance to radiation and so on, offer broad prospects in optoelectronics, high-temperature and high-power devices and high frequency microwave device applications. Rely on ...学位：理学硕士院系专业：物理科学与技术学院_凝聚态物理学号：1982014115295

非离子态氨对转“全鱼”生长激素基因鲤鱼的急性毒性和慢性毒性

在自然水体和人工水体中氨氮对鱼类是有毒的.利用静水更新式生物测试研究了非离子态氨对转基因鲤鱼和对照鱼的96h急性毒性实验和21d慢性毒性实验.通过96h非离子态氨急性毒性实验发现,转基因鲤鱼的非离子态氨氮24,48,72和96h半数致死浓度(LC50)(2.64,2.44,2.28和2.16mg/L)分别比对照鲤鱼相应的24,48,72和96h半数致死浓度(LC50)(2.70,2.64,2.52和2.33mg/L)略低,没有显著性差异;但在不同非离子态氨氮(3.86,3.29和2.09mg/L)胁迫下