Analysis and Design of Management Information System for Steel Structure Company

根据国内互联网技术和信息发展的要求，在新的经济结构调整过程中，作为传统的制造业企业必须实现从离散式生产线向流水性生产线进行改造，实现企业制造的信息化建设，通过实现企业一体化和信息的联通，适应企业未来发展的需要，使信息化建设成为企业战略目标的有效支撑，基于企业目前的组织架构，岗位设置和结合现在运行中的业务流程，结合企业运营的信息流、物流、资金流，通过整理企业各部门的信息化需求，优化整合业务流程，建立信息化数据流的模型，进而消除信息孤岛和实现信息化管理。在设计过程中需要形成详细规整的整体架构与规划，运用软件工程设计知识及多年的钢结构行业经验，在传统的信息管理系统基础上，设计一个更适用于本企业的信息...To realization of intelligent manufacturing and information management, we need to be familiar with the company's future development strategy and business support. Based on current business organizational structure, post setting and combine running business processes, information flow, logistics, capital flow of business operations, sorting through the information needs of enterprises of various d...学位：工程硕士院系专业：软件学院_工程硕士(软件工程)学号：X201223094

Far-Field Tunable Nano-focusing Based on Metallic Slits Surrounded with Nonlinear-Variant Widths and Linear-Variant Depths of Circular Dielectric Grating

In this work, we design a new tunable nanofocusing lens by the linear-variant depths and nonlinear-variant widths of circular grating for far field practical applications. The constructively interference of cylindrical surface plasmon launched by the subwavelength metallic structure can form a subdiffraction-limited focus, and the focal length of the this structures can be adjusted if the each groove depth and width of circular grating are arranged in traced profile. According to the numerical calculation, the range of focusing points shift is much more than other plasmonic lens, and the relative phase of emitting light scattered by surface plasmon coupling circular grating can be modulated by the nonlinear-variant width and linear-variant depth. The simulation result indicates that the different relative phase of emitting light lead to variant focal length. We firstly show a unique phenomenon for the linear-variant depths and nonlinear-variant widths of circular grating that the positive change and negative change of the depths and widths of grooves can result in different of variation trend between relative phases and focal lengths. These results paved the road for utilizing the plasmonic lens in high-density optical storage, nanolithography, superresolution optical microscopic imaging, optical trapping, and sensing.Comment: 14pages,9figure

Effects of nitrogen application rates on grain yield,soil organic carbon and nitrogen under a rainfed cropping system in the loess tablelands of China

施用氮肥是提高作物产量和土壤有机碳(SOC)、氮(TSN)含量的重要养分管理措施。利用长期田间试验(19842~007),定量评价了常规耕作条件下5个施氮水平N 0(N0)、45(N45)、90(N90)、135(N135)和180(N180)kg/hm2处理下,小麦子粒产量、SOC、TSN和氮肥利用效率的变化。研究了施氮水平对黄土旱塬区小麦产量、SOC和TSN积累的影响。结果表明,19842~007年期间,N0、N45、N90、N135和N180处理小麦产量的平均值依次为1.2、2.4、2.9、3.2和3.4t/hm2;N0处理的小麦产量随试验年限而降低,年降低幅度达67 kg/hm2(P<0.001);但增施氮肥处理小麦产量降低趋势得到显著控制,当施氮水平提高到N 90 kg/hm2时,产量随年限呈现出缓慢升高的趋势。随着施氮水平的提高,地上部氮肥利用率由40%(N45)降低到28%(N180)。不同施氮水平条件下,SOC含量随年限呈缓慢升高趋势。23年后(2007年),N0、N45、N90、N135和N180处理下,0—20 cm土层SOC储量依次为16.9、18.2、18.7、19.0和19.1 t/..