Research on Control Technology of CNC Wire Bending Robot with Single-head and Multi-mode

目前我国金属线材产品的市场需求量急剧增加，且产品开发种类也日趋多样化和复杂化，然而我国金属线材的生产方式还处于劳动密集型阶段，其传统的成形工艺已不能满足现代制造系统的灵活和快速的要求，这与现代设计制造所倡导的“高效、高精度、高智能化”的理念相背离。 本文从国家长远发展考虑，并结合我国五金线材市场的装备需求，采用柔性化、模块化的产品设计方法和可重组的设备工艺技术，提出一种以小批量多品种生产方式的高度柔性化制造理念。为了加快我国金属线材自动化设备的开发进程，在已开发的双头模位型数控弯丝机器人基础上，对金属线材成形原理及其数控加工技术等关键技术进行进一步深入研究，研发了一台具有自主知识产权的单头多...The current market demand for metal wire production of our country has been increased sharply and the type of product development is becoming increasingly diverse and complex. However, the major production mode of metal wire forming is labor-intensive, inefficient and inaccurate in our country, and its traditional forming process can not meet the fast and flexible requirements of modern manufactur...学位：工学硕士院系专业：物理与机电工程学院_机械设计及理论学号：1992011115276

银行治理视角下资本监管对银行风险承担的影响研究

本文基于中国55家商业银行2007-2015年的面板数据,分析了资本监管与银行风险承担行为的关系,并探讨了银行股权结构对二者关系的影响。结果表明:第一,银行的资本充足率监管套利行为比较严重,资本充足率和核心资本充足率显著提高了我国银行风险承担;第二,杠杆率显著降低了我国银行风险承担;第三,银行股权集中度增强了资本充足率和核心资本充足率对银行风险的增加作用,削弱了杠杆率对银行风险的降低作用;第四,非国有银行的资本充足率监管套利行为更严重,杠杆率对其风险的降低作用更小,其股权集中度对资本水平与银行风险关系的增强作用更大。国家自然科学基金青年项目“银行系统风险的建模与估计:基于银行同业复杂网络和货币政策视角”(71501167)的阶段性成

病毒对海洋细菌代谢的影响及其生物地球化学效应

病毒是海洋生态系统中丰度最高的生命形式,其中超过90%属于浮游细菌(细菌和古菌)病毒,是海洋生态系统的重要参与者和海洋生物地球化学循环的重要驱动力。作为海洋浮游细菌主要的致死因子之一,病毒通过裂解宿主释放出大量的有机物和营养盐,调控宿主群落的代谢行为,进而影响生物地球化学循环。同时,伴随侵染的发生,病毒挟持宿主细胞的代谢系统完成自身的生命周期,从而改变宿主胞内的代谢途径和代谢产物。概述了病毒在个体层面和群落层面对海洋浮游细菌代谢的影响,及其对海洋元素循环的作用,评估了气候变化、环境因子对病毒调控细菌代谢的潜在影响,有助于人们对微生物参与的海洋生物地球化学循环的全面认识。国家自然科学基金优秀青年科学基金项目“海洋病毒生态学”(编号:41522603);国家自然科学基金面上项目“溶源性噬菌体对海洋细菌生理生态特性的影响”(编号:31570172)资助~

货币政策地区效应的微观基础研究:我国省际居民消费储蓄行为的实证分析

本文通过使用面板数据对影响货币政策地区效应的微观基础-我国省际居民的消费储蓄行为进行实证研究。结果发现,时间贴现因子、风险厌恶系数、跨期替代弹性、综合效应因子等影响居民消费储蓄行为的参数在我国地区间存在较大差异,导致我国省际居民消费储蓄对利率的敏感性各不相同,进而使货币政策效应存在区域差异。教育部文科重点研究基地2005年度重大研究项目(项目批准号:05JJD790025)资

“鲍曼悖论”及其理论解释——来自我国上市公司的经验证据

本文基于2000-2009年我国十个行业225家上市公司的资产回报率数据,分别采用"方差法"和"序数法"度量战略风险,并通过风险/收益计算窗口的提前或滞后安排对"鲍曼悖论"的存在性及其可能解释进行实证检验。研究发现,由于数据严重左偏,用方差法度量战略风险会导致虚假的实证结果,而基于序数法的元分析结果揭示我国上市公司战略风险和滞后收益间存在显著的负相关关系,支持"风险隐性成本说"关于战略风险-收益关系的因果论证

Applications of Chlorella in food industry

现代食品工业正朝着绿色健康、便利的方向发展,具有保健功能的天然产物将是今后新型食品的一个重要发展方向。小球藻因高蛋白、富含类胡萝卜素、维生素等特; 点,具有多种保健功能,可作为功能性食品或保健品应用于食品行业中。本文综述了近年来小球藻在保健食品、功能性食品中的研究和应用进展,着重介绍了小球藻; 在保健食品及主食、副食、饮料等功能性食品中的具体应用和国内外研究进展,以期为今后小球藻在食品行业中的应用提供参考。Modern food industry aimed at green,healthy and more convenient foods.; The use of natural ingredients with functional activity was an; attractive way to design new foods.Due to its high in protein content; and richness in carotenoids and vitamins,Chlorella had many healthcare; functions and could be used in food industry as a functional food and; nutrition enhancing agent.Research progress in the applications of; Chlorella in health food and functional foods in recent years,especially; in staple food,baked food,and beverage,was reviewed in this paper in; order to provide valuable information for the further application of; Chlorella in food industry.国家自然科学基金; 福建省高校产学合作项目; 福建省教育厅中青年教师教育科研项目; 泉州市科技局校地协同创新项

Design of Raman spectroscopy measurement system based on shifted excitation method using two laser diodes with different wavelengths

拉曼光谱检测常常受到荧光干扰,而移频激发拉曼差分光谱法(SERDS)是一种有效抑制拉曼光谱荧光背景的方法。基于该方法,采用两个波长相近、基于体布拉格光栅技术的固定波长激光器,设计了一套拉曼光谱测试系统。通过控制激光器的功率和温度,保证了输出波长的稳定性。采用高灵敏度的薄型背照式面阵CCD,设计了光谱数据采集光路和电路。同时,在软件上实现了差分光谱的三种重构算法,即简单积分算法、带数值插值的简单积分算法和多重约束解卷积算法。在实验中,利用文中系统对强荧光背景的某品牌香油进行了拉曼光谱测量,分别采用这三种算法处理差分光谱进行光谱重构,并对比了重构效果。实验结果表明,设计的系统能够有效抑制荧光对拉曼光谱检测的影响。Raman detection is often disturbed by fluorescence background, while Shifted Excitation Raman Difference Spectroscopy(SERDS)is an effective method for fluorescent suppression on Raman spectroscopy.Based on this method, a Raman spectroscopy measurement system was designed using two closely space fixed-wavelength laser diodes stabilized with the Volume Bragg Gratings. The output wavelength of laser diodes was stabilized by manipulating their power and temperature. The light path and circuit of spectral data acquisition were designed with back-thinned area array CCD with high sensitivity. Besides, the three different reconstruction algorithms of the difference spectrum, namely simple integration algorithm, simple integration with data interpolation algorithm and multiple energy constraint iterative deconvolution algorithm could be realized through software of this system. The Raman spectra of sesame oil of some brand in the presence of a highly fluorescent were measured with this system and then the spectra reconstructed with three different algorithms to process the difference spectrum respectively were compared.Experimental results show that the system designed in this paper can effectively reject the effect of fluorescence to the Raman spectroscopy measurement.国家重大科学仪器设备开发专项(2011YQ03012417

Rhizosphere soil nutrient and enzyme activity of Casuarina equisetifolia clone plantation and seedling plantation

木麻黄无性系林根际土壤有机质、全氮、水解氮、全磷、全钾、速效钾、钙和镁离子含量均大于木麻黄实生林,有效磷含量则相反。与实生林相比,木麻黄无性系林根际和非根际土壤pH值均有所下降,CEC值增加。木麻黄无性系林根际土壤脲酶、磷酸酶、过氧化物酶及多酚氧化酶活性均高于木麻黄实生林。脲酶除外,其余3种酶活性均是根际大于非根际。与木麻黄实生林相比,木麻黄无性系林根际环境得到改善,林地土壤营养贮量和养分供应能力提高,生长效果亦优于本地实生苗造林。The results showed that the contents of organic matter,total N,Hydrolytic N,total P,total K,available K,Ca2+ and Mg2+ in rhizosphere soil of clone plantation were higher than those of seedling plantation,except for available P.Compared to seedling C.equisetifolia,pH value of soil declined in clone plantation but CEC value increased.Uresese,phosphataese,peroxidase and polyphenol oxidase of rhizosphere soil were more active in clone plantation than those in seedling plantation.Environment in rhizosphere soil of C.equisetifolia clone plantation was improved and nutrient-holding and providing capacities were enhanced,therefore,growth status was better than seedling C.equisetifolia.国家“十一五”科技支撑计划项目(2006BAD03A14-01,2006BAD01A16);; 福建省重大专项和福建省林木种苗攻关项

Immobilized cultivation of Dictyostelium discoideum with polyurethane foam

研究了聚氨酯泡沫应用于固定化盘基网柄菌的可行性,发现以简单处理过的聚氨酯泡沫为载体,能够高效实现盘基网柄菌的固定化培养。考察了载体粒径大小、载体量和摇床转速等对固定化培养的影响,在优化的培养条件和固定化条件下,盘基网柄菌的最大细胞密度是悬浮培养的2~4倍。The immobilization of D.discoideum with polyurethane foam(PUF) was proposed and the effects of PUF's properties on the immobilization was examined.The results showed that PUF was a suitable carrier for the efficient imoblization of D.discoideum.The effects of PUF addition and culture conditions were optimized to attain high density of D.discoideum.Under optimized culture conditions,high cell density of D.discoideum(4.56×107 cells/mL) has been achieved in the shake flasks,which was 2～4 times higher than that of free-cell culture in the axenic medium.国家自然科学基金资助项目(30370039