Preparation of Europium-Containing Silicon Oxynitride Phosphor doped by Magnesium with High Quantum Efficiency

利用聚合物先驱体转化法可以成功制备物化性能稳定、相结构简单的含铕硅基氮氧化物荧光粉，但其量子效率不佳，导致发光强度不够高。适量镁掺杂可以显著提高稀土掺杂碱土金属硅基氮氧化物以及铈掺杂硅基氮氧化物荧光粉的发光性能，但在聚合物先驱体转化法中掺镁对含铕硅基氮氧化物荧光粉的影响尚不清楚，因此有必要探索通过掺镁制备结构简单且具有高量子效率的含铕纯硅基氮氧化物荧光粉。本论文探讨采用聚合物先驱体转化法，以聚碳硅烷、乙酰丙酮铕和乙酰丙酮镁为原料来制备高量子效率的掺镁含铕硅基氮氧化物荧光粉。结合元素分析、XRD、SEM及荧光光谱，系统地探究了烧结方法、终烧温度和投料比对荧光粉的组成、相结构、形貌及荧光性能的影响...The europium (Eu)-doped silicon oxynitride phosphor with stable physicochemical properties and simple phase structure has been successfully synthesized via a novel polymer-derived method. However, the photoluminescence properties (quantum efficiency) of those phosphors need to be further improved. It has been found that doping with appropriate amount of magnesium (Mg) ion could highly enhance the ...学位：工程硕士院系专业：材料学院_工程硕士(材料工程)学号：2072014115011

E-Supply Chain Mannagement Project for ABB HUADIAN HV Switchgear CO.LTD

随着市场竞争的日益激烈，建立高效率的供应链管理模式成为企业降低运营成本，提高市场竞争力的重要砝码，也成为许多公司企业战略的重要组成部分。而电子商务的出现又改变了供应链运行中原有的物流、信息流和资金流的交互方式与实现手段，充分优化了资源利用，提高了供应链运行的效率，降低了成本和提高了服务质量。在快速发展的电子商务的支持和带动下，供应链管理得到了极大的发展，并充分利用其资源和功能，实现供应链管理的创新、运行的优化和应用的扩展。厦门ABB华电高压开关有限公司正处在一个激烈竞争的市场环境下，产品价格高和交货周期长是该公司在市场竞争中所面临的最大的问题，而低效率的供应链管理是导致这些问题的重要因素。本文...Along with more and more higher marketing competition, establishing efficient supply chain management has become an important way for company to lower cost and raise competition ability and also important part of enterprise strategy. E-commerce have changed the old operation way of commodity flow, information flow and capital flow in supply chain, which also have optimized enterprise resource and ...学位：管理学硕士院系专业：管理学院企业管理系_企业管理(含财务管理、市场营销、人力资源管理)学号：K20010726

Gasbench Ⅱ-IRMS升级NO预富集装置测定海水硝酸盐的氮氧同位素

本研究研制了由气压棒、气体控制阀、不锈钢管冷阱、石英毛细管冷阱、杜瓦瓶、化学阱等构成的NO预富集装置,通过扩展GasbenchⅡ功能控制冷阱的升降,改造气体回路、进样针和样品盘,实现NO的预富集以及GasbenchⅡ自动进样与IRMS联机测定.通过将海水中的硝酸盐经化学方法转化成NO,建立了海水硝酸盐氮、氧同位素的分析方法.研究表明,所建立方法对海水硝酸盐氮、氧同位素的分析具有很好的精度,硝酸盐δN、δO及峰面积的相对标准偏差分别小于1%、3%和5%.对采自南极普里兹湾海水样品中硝酸盐氮、氧同位素的分析结果与文献报道值吻合,也与海水硝酸盐氮、氧同位素组成的变化规律相一致,证明所建立的技术方法可成功运用于海水硝酸盐氮、氧同位素的分析.高等学校仪器设备和优质资源共享系统大型仪器示范机组建设资助项目(CERS-1-76)；国家重点基础研究发展计划资助项目(2015CB452903)；南北极环境综合考察与评估专项资助项目(CHINARE2016-01-04-03)；国家自然科学基金杰出青年基金资助项目(41125020)

Inhibitory mechanism of extracts from Ginkgo biolaba sarcotesta on mushroom tyrosinase

作者简介: 王勤(19692) ,女,山东济宁市人,博士,副教授,主要从事生物化学研究, (E-mail) qwang @xmu. edu. cn。 通讯作者(Author for correspondence ,E-mail :chenqx @xmu. edu. cn)[中文文摘] 以银杏外种皮为材料,采用水、乙醇和乙醇-乙醚三种不同的方法分离提取其中的活性物质(分别命名为1#,2#,3#),研究它们对蘑菇酪氨酸酶催化L-多巴(L-DOPA)氧化活力的影响。结果表明,这3种提取物均对蘑菇酪氨酸酶有抑制作用,1#,2#和3#对酶抑制作用的IC50分别为2.25、1.75和0.32mg/mL。抑制作用动力学结果表明:三种提取物对酶的抑制作用均表现为混合型,相应的抑制常数KI依次为2.11、1.62和0.29mg/mL;KIS依次为2.80、2.33和0.45mg/mL。结果显示,采用乙醇-乙醚提取的银杏外种皮提取物对酪氨酸酶抑制作用最强。[英文文摘] Three extractants(water,ethanol and ethanol-aether mixture)were isolated from Ginkgo biolaba sarcotesta,and then three kinds of extracts were used to test the inhibition on the activity of mushroom tyrosinase.The results showed that three extracts could inhibit the activity of tyrosinase obviously.The inhibitor’s concentration leading to 50% enzyme activity lost,IC50 was estimated to be 2.25,1.75 and 0.32 mg/mL,respectively.Their inhibition mechanisms were analyzed.All of three extracts showed reversibly inhibitors to tyrosinase and the type of inhibition belonged to be mixed-type.The inhibition constants,KI and KIS,of each extract were determined respectively and compared.The value of KI was determined to be 2.11,1.62 and 0.29 mg/mL,respectively;the value of KISwas determined to be 2.80,2.33 and 0.45 mg/mL,respectively.The ethanol-aether extracts showed the best inhibition on tyrosinase.福建省自然科学基金(B0510001);国家自然科学基金(30570408

Design and Analysis of Elastic Component of Resonant Cylinder Pressure Sensor

利用有限元分析软件AnSyS对振筒式压力传感器弹性元件——谐振筒进行了动态特性仿真分析,建立了谐振筒的参数化模型,基于模态分析选定合适的工作振型,重点利用谐响应分析讨论了谐振筒品质因数的影响因素。研究表明,当谐振筒的基模态为(4,1)模态时,品质因数随谐振筒外半径、有效长度以及壁厚的增加而减小,而工作时作用于谐振筒的激励载荷只改变了谐振筒振幅大小,对品质因数无明显影响。通过瞬态动力学分析计算得到谐振筒的调节时间,证明了谐振筒具有较好的动态响应特性。为谐振筒的结构设计和优化提供了参考。Simulation and analysis on dynamic behavior of resonant cylinder which composed the pressure sensor as the elastic component are conducted using the finite element analysis software ANSYS.Parametric model is established.Based on the modal analysis,an appropriate mode for work is selected out.Factors affecting quality factor are discussed mainly through harmonic response analysis.Results indicate that,when the cylinder worked on(4,1) mode,quality factor would decreases as radius,effective length or thickness increase,while the force only had an influence on the amplitude of the vibration rather than the quality factor.Adjusting time is obtained by transient dynamic analysis,thus proving the rapidity of resonant cylinder.The study provides reference both for structure design and optimization

不同年份早籼稻佳辐占稻米品质性状分析

佳辐占是厦门大学水稻育种组采用一条自创的优质稻品种选育方法育成的千粒重达30g的优质早籼稻新品种。本文跟踪分析了5年中不同地方种植的佳辐占的稻米品质,结果表明,佳辐占的早、晚季稻米大部分品质指标基本符合部颁优质米一级标准,并表现出很好的品质性状遗传稳定性。国家农业部跨越计划(2006跨04)资

4-氨基苯甲酸对蘑菇酪氨酸酶的抑制作用机理研究

报道了4-氨基苯甲酸(4-aminobenzoic acid)对蘑菇酪氨酸酶单酚酶和二酚酶活力的影响和抑制效应.结果表明,4-氨基苯甲酸对蘑菇酪氨酸酶的单酚酶和二酚酶活性均有抑制作用.导致单酚酶活力和二酚酶活力下降50%的抑制剂浓度(IC50)分别为0.35和0.30 mmol/L.4-氨基苯甲酸对单酚酶的迟滞时间有明显的延长效应,1.0 mmol/L可使单酚酶的迟滞时间从30.5 s延长到155.1 s,增加了4.4倍.4-氨基苯甲酸对二酚酶的抑制作用表现为混合型可逆抑制作用,抑制常数(KI和KIS)分别为0.259和1.46 mmol/L

含聚(2-甲基丙烯四級銨鹽)陰離子交換劑之單管柱離子層析法研究

[[abstract]]A ploy(2-methylallyl) copolymerized silica-based anion exchanger containing tetraqlkylammonium groups is used to investigate the chromatographic behavior of analyte anions. The material is rigid, stable and compatible with a wide variety of eluents. A homologous series of dicarboxylic acid (oxalic acid, malonic acid, succinic acid, gultaric acid and adipic acid) and the salts of organic acid (KHP) as eluents has shown to be effective separation of some organic and inorganic anions on single-column ion chromatography (SCIC) with conductivity detector. The retention of analyte anions is found to depend on the anion exchanger capacity, the structure of the anion exchanger, kind of eluents, eluent concentration/ or pH and concentration of organic modifier. Careful control of thse paramrters can improve selsctivity and resolution of analyte anions. The retention mechanism of analyte anions on the stationary phase is a combination of absorption and ion exchange.