A Practice Research on Social Work Control over Enterprise Employees'Turnover Rate：based on the Practice in A Factory，J Company

近年来，各行业员工离职率逐渐升高，离职率过高一方面反映了企业员工面临情绪较为波动、劳资关系较为紧张等困扰，另一方面造成企业凝聚力下降，导致企业人力资源成本增加、生产效率下降等问题。因此，如何有效控制企业员工离职率已成为众多学者和企业管理者关注的焦点。目前关于企业员工离职率的研究主要集中在探讨员工离职的原因及对策两方面，但是针对企业离职率控制问题的社会工作实务尚不多见。鉴于此，本研究拟从企业社会工作的角度，分析和探讨如何通过社会工作控制和降低企业员工的离职率，一方面通过对离职率的控制，可以降低企业运营成本，提高企业的凝聚力，增强企业的市场竞争力，另一方面，希望可以探索出一个社会工作介入企业员工离...In recent years, all industries’ staff turnover rate increased gradually, high turnover rate reflects the employees’ emotion is more volatile, labor relation is more tense, resulting in the decline of corporate cohesion, it can lead to the cost of human resources increased, corporate efficiency decreased and so on. Therefore, how to control employee turnover rate effectively has become the focus o...学位：社会工作硕士院系专业：公共事务学院社会学系_社会学学号：1402010115052

两种DOPO阻燃环氧树脂固化剂的室温合成及性能

无卤反应型多元素协同是环氧树脂阻燃研究的热点,室温合成了上述功能的活性DOPO衍生物DOPO-M和DOPOT。它们作为固化剂,分别与4,4’-二氨基二苯甲烷混合,再与等当量环氧树脂E51固化得到阻燃元素含量可控的环氧体系。使用NMR证明了DOPO衍生物结构,使用红外跟踪其固化过程,继而使用DMTA、TGA和LOI测试分别研究了DOPO衍生物引入量、结构区别对环氧树脂热力学性能、耐热性能及阻燃性能的控制趋势。结果表明:(1)阻燃环氧体系都为均相体系;(2)阻燃环氧体系的耐热性能及阻燃性能均得到显著提升;(3)DOPO-M比DOPO-T在提升阻燃环氧体系的耐热性能及阻燃性能上更有优势。湖北省自然科学基金(ZRMS2016001126);;湖北科技学院核技术专项(2018-19KZ06);湖北科技学院校级项目(2016-XC-010,2017-XB-017);;湖北省教育厅优秀中青年人才科研项目(Q20162806)资

Fast algorithm for mining association rules based on relationship matrix

首先对关联规则挖掘问题进行了简单的回顾,然后应用关系理论思想,引入了项目可辨识向量及其“与”运算,设计了一种快速挖掘算法SLIG,将频繁项目集的产生过程转化为项目集的关系矩阵中向量运算过程。算法只需扫描一遍数据库,克服了Apriori及其相关算法产生大量候选集和需多次扫描数据库的缺点。实验证明,与Apriori算法相比,SLIG算法提高了挖掘效率。After the introduction of famous Apriori algorithms, an efficient algorithm SLIG(Single-level Large Itemsets Generation) learning from relation theory and "AND" operation on recognizable vectors was proposed. SLIG transformed the production process of frequent itemset to the vector calculation process in relationship matrix and only needed to scan the database once. Empirical evaluation and experiments show that SLIG is more efficient than the algorithms that need to pass the large database many times

Realization of the Interoperation between CAN and LIN Bus

介绍了CAN总线、LIN总线的特点,研究了两种总线之间的互操作性,提出了一种基于CAN总线、LIN总线的混和网络体系,设计了CAN/LIN网关。重点阐述了CAN/LIN混和网络的构建和网关的硬件设计以及软件实现,并简要介绍其在电梯通信系统中的应用。该混和网络适用于多领域成本低、可靠性高。The characteristics of CAN and LIN were introduced and the interoperation of both was studied,based on which,a mixed network and CAN/LIN gateway were proposed.The construction of CAN/LIN mixed network and the hardware & software of the gateway were detailed expounded.Also the application of this mixed network in elevator communication system was introduced briefly.The mixed network could be widely used with low cost and high reliability

In Situ FTIR Spectrocopic Studies of CO and CN~- Adsorbed on Electrode of Nanometer Thin Film of Palladium in Alkaline Solutions

以原位FTIR反射光谱研究碱性介质中CO和CN-在纳米Pd膜电极上的吸附和共吸附 ,进一步揭示了纳米薄膜材料的异常红外效应和CO与CN-共吸附时的相互作用规律。The adsorption and coadsorption of CO and CN- - on electrode of nanometer thin film of palladium (nm-Pd/GC)was studied by usin g in situ FTIR spectroscopy.The results demonstrated that the nm-Pd/GC electrod e exhibited abnormal infrared effects (AIREs) in alkaline solutions as in acid s olutions.The characters of AIREs,i.e.,the inversion of the direc tion of IR band,the augmentation of FWHM and the significant enhancement of IR a bsorption by adsorbed species were observed in all cases of adsorption and coads orption of CO and CN--.It has been illustrated that strong interaction is exis ted between adsorbed CO and CN-- on nm-Pd/GC surface.The study has contribute d towards understanding the surface processes of chemisorption as well as to rev eal the origin of nanometer size-effects of thin film materials.国家自然基金!(2 98330 60 );; 教育部博士点基金!(1 9990 3840 3)资

普鲁兰基肿瘤靶向性纳米粒子的制备、稳定性和体外释放

背景:普鲁兰多糖以其独特的优点在纳米递药系统领域受到越来越多的关注,但是,以普鲁兰多糖为材料进行改性制备的肿瘤靶向的纳米药物载体仍有待进一步研究与开发。目的:观察纳米粒子和载药纳米粒子的体外稳定性及所包载药物的释放特征,初步评价其作为纳米药物载体的潜力。方法:应用透析法制备乙酰普鲁兰叶酸偶合体纳米粒子,以表阿霉素为模型药物,制备乙酰普鲁兰叶酸偶合体/表阿霉素载药纳米粒子(FPA/EPI),应用储存法考察其稳定性,应用透析袋法观测体外释放特征。结果与结论:乙酰普鲁兰叶酸偶合体纳米粒子和FPA/EPI的粒径分别为(204.2±10.9)nm和(273.4±11.0)nm,在蒸馏水和体积分数10%胎牛血清中表面电位均较低,乙酰普鲁兰叶酸偶合体纳米粒子在水溶液中粒径1年内未见显著改变。载药纳米粒子对所包载的药物表阿霉素进行很好地释放,pH5.0磷酸盐缓冲液中释放速度明显高于pH7.4;乙酰普鲁兰叶酸偶合体纳米粒子和FPA/EPI制备容易,稳定性好,初步说明了两种粒子可望成为新型肿瘤靶向药物递药系统

造血干细胞移植治疗儿童白血病的临床研究

【目的】评价造血干细胞移植(HSCT)治疗儿童白血病的疗效及合并症。【方法】非血缘相关脐血移植(UDUCBT) 治疗儿童白血病5 例(AM L 4 例, HR-ALL 1 例);同胞外周血造血干细胞移植(allo-PBSCT)治疗CML 及HR-ALL 各1 例;自体外周血造血干细胞移植(auto-PBSCT)治疗AML 2 例。UD-UCBT 中4 例为HLA 5/6 相合, 1 例为全相合。输入的脐 血(UCB)平均有核细胞数(NC)为6.29 ×107/ kg , CFU-GM 为0.17 ×105/ kg , CD34+细胞数为4.6×105/kg 。预处理主要以马 利兰(Bu)、环磷酰胺(CY)、氟达拉宾(Flu)和马法兰(Mel)等组成的方案。【结果】4 例可评价的UD-UCBT 患儿中3 例完全植 入, 1 例未植入者自体造血恢复, 2 例allo-PBSCT 患儿均完全植入。UCBT 后外周血中性粒细胞绝对计数(ANC)≥0.5 ×109/ L 的中位时间为+21 d , 血小板(PLT)≥20 ×109/ L 的中位时间为+40 d。2 例allo-PBSCT 患儿外周血ANC ≥0.5 ×109/L 的 中位时间分别为+10 d 和+12 d, PLT≥20×109/L 的中位时间为+11 d 和+14 d。3 例植入的UCBT 者2 例分别发生Ⅰ 度和 Ⅲ 度aGVHD。2 例allo-PBSCT 患儿分别发生Ⅱ 度和Ⅲ 度aGVHD。随访25 个月, 2 例auto-PBSCT 患儿均复发。allo-HSCT 7 例中2 例复发, 2 例死于移植合并症, 3 例无病存活至今。【结论】HSCT 是治疗白血病的有效手段, 但对供体选择、移植时疾 病状态及移植后的免疫治疗均为移植是否成功及降低复发的关键因素, 值得深入探讨。 关键词:中图分类号 　　　文献标识码:A　　　文章编号

In situ FTIR spectrocopic studies of CO and CN- adsorbed on electrode of nanometer thin film of palladium in alkaline solutions

The adsorption and coadsorption of CO and CN- on electrode of nanometer thin film of palladium (nm-Pd/GC)was studied by using in situ FTIR spectroscopy. The results demonstrated that the nm-Pd/GC electrode exhibited abnormal infrared effects (AIREs) in alkaline solutions as in acid solutions. The characters of AIREs, i.e.,the inversion of the direction of IR band, the augmentation of FWHM and the significant enhancement of IR absorption by adsorbed species were observed in all cases of adsorption and co-adsorption of CO and CN-. It has been illustrated that strong interaction is existed between adsorbed CO and CN- on nm-Pd/GC surface. The study has contributed towards understanding the surface processes of chemisorption as well as to reveal the origin of nanometer size-effects of thin film materials

含脐血MSCs 体系扩增后的脐血重建 NOD/SCID小鼠造血的研究

【目的】探讨含人脐血(umbilical cord blood，UCB)来源的间充质干细胞(mesenchymal stem cells，MSCs)联合造血生长因子(hematopoietic growth factors，HGFs)体系扩增后的脐血造血细胞在NOD／SCID小鼠体内植入及重建小鼠造血的能力。【方法】①用含女性胎儿脐血MSCs(UCBMSCs)及HGFs组合的无血清扩增体系体外扩增男性新生儿UCB CD34~+细胞。②收获扩增第6天的UCB细胞，经尾静脉移植给亚致死量照射后的雌性NOD／SCID小鼠。③动态观察移植后小鼠生存情况及外周血象的恢复。④移植后8周，流式细胞仪检测存活小鼠骨髓中人CD45~+、CD45~+CD33~+、CD45~+CD41~+、CD45~+CD3~+和CD45~+CD19~+细胞含量；PCR法检测移植小鼠外周血中人Y染色体表达。【结果】①非扩增组小鼠存活率为60％，扩增组存活率为90％。②动态观察发现：扩增组白细胞和血红蛋白于移植后第20天恢复，PLT于移植后第40天恢复，明显短于非扩增组。③移植后8周，两组小鼠外周血中人Y染色体检测均为阳性，扩增组和非扩增组小鼠骨髓中人CD45+细胞的含量分别为18.5％±8.3％和16.5％±5.7％，差异无统计学意义(P＞0.05)。④移植后8周，扩增组小鼠体内CD45~+CD33~+和CD45~+CD41a~+细胞的百分率均高于非扩增组，但CD45~+CD3~+、CD45~+CD19~+细胞百分比均低于非扩增组。【结论】①含人UCBMSCs体系扩增后的UCB细胞具有NOD／SCID小鼠体内植入并重建小鼠造血的能力，似不具有提高小鼠体内植入率的作用。②扩增后的UCB移植可显著促进移植后小鼠造血恢复，提高小鼠存活率。③扩增后的UCB移植主要促进小鼠髓系及巨核系的植入，但对淋巴系的植入有抑制作用

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