ESR法表征12-钼磷酸对苯乙烯自由基聚合反应的阻聚作用

通过使用电子顺磁共振仪(ESR)对苯乙烯自由基聚合体系中自由基的跟踪测试,进一步证实12-钼磷酸确实能够在自由基聚合体系中起到阻聚剂的作用,而且更加明确地提出其阻聚机理:通过捕获体系中的电子达到抑制自由基聚合反应的发生.     

利用GPIO模拟12C总线协议

随着工业技术的发展,I2C总线协议在工业现场中运用的很广泛,而具有I2C接口的器件也越来越多,大家开始通过利用普通I/O来模拟I2C的技术,从而就解决了主控单元I2C缺少的问题。     

基于GPRS的远程数据传输模块设计

GPRS（通用分组无线服务技术,General Packet Radio Service）以接入迅速、实时在线、快捷登录、高速传输、自如切换等特点,在远程数据传输系统中有着巨大的优势。本文论述了基于无线模块EIC—CG12、AT89C51单片机的GPRS数据传输模块的设计方案。给出硬件设计原理图,以及软件设计流程图。提出了用GPRS进行无线数据传输的实现方法。     

基于MSP430F449单片机的USB通用串行总线设计

本文介绍了MSP430F449单片机的一些特性,同时、给出了以其为核心设计的USB接口设计实例。     

木薯抗叶片早衰的基因工程育种

以农杆菌介导的转化方法将一个抗叶片早衰的基因成功地导入木薯基因组 .将成熟培养 1 5天后的胚状体的子叶切碎 ,与农杆菌LBA44 0 4共培养 3天 ,然后转入器官发生培养基 (MS基本培养基附加BAP 1mg/L、IBA 0 .5mg/L)附加 3 0mg/LG41 8进行筛选 .三个星期后出现抗性的愈伤、芽 .将这些抗性芽连同外植体转入茎轴生长培养基促进苗的生长 ,最后转入生根培养基长成植株 .所得抗性株经PCR、Southern分析证实部分植株为转基因株 .     

从第12届全运会探析新周期我国女子体操竞技实力

通过录像观察、问卷调查、专家访谈和数理统计等方法,对参加第12届全运会女子体操比赛运动员的情况进行调查研究,并全面分析了新周期我国女子竞技体操四个项目的竞技实力。结果显示,当前我国女子体操专业队运动员年龄偏大、数量不足、伤病严重,且"青黄不接",缺乏领军人物;跳马难度有所提高,但完成质量总体不高;高低杠有所突破和提高,具备较高实力,但缺乏顶尖人才;平衡木表现平平;自由体操在难度和质量上均无明显突破。     

Pwc_(170)台阶实验、15min跑和12min跑与间接推算(“非汉字符号”)O_(2max)的研究

对我校文理科二年级 15 3名大学生分别进行 Pwc1 70 台阶实验、15 min跑、12 min的测试 ,采用间接推算方法 ,分别计算 VO2 max,结果表明 :1)采用 Pwc1 70 台阶实验和 15 m in跑测试方法间接推算 VO2 max值较能反映大学生有氧能力 ;2 )文科学生有氧能力高于理科学生 ;3)间接推算 VO2 max值采用卡尔普曼推算公式比阿斯特朗和贝尔斯特姆推算公式更为合理。     

Innovation and strategy: Does it make a difference! A linear study of micro & SMEs

Innovation is known to be used by some businesses to help them differentiate their trading position within a specific locale. Research has also proven that by adopting a strategy, aims can be achieved and turnover increased. This study will endeavour to use these two key areas to evaluate how, they are used and to what extent they can improve business performance. The study was carried using 145 Micro and SME business, located within the rural county of Lincolnshire. The businesses were taken from specific locations on a random basis which included rural, remote rural and urban settings. Initial findings found that businesses situated within remote areas performed better than those within the other test areas, leading to the conclusion that they use innovation as a strategy to outperform their business rivals.     

A市K12教培现状调查分析

K12教育培训在中国具有普遍性,本文通过设计问卷调查,了解人们对课外补习机构的认识与需求以折射出培训机构现状。本文的主要工作有:首先,通过调查分析人们对教培行业的了解程度、参与的主要培训项目、教培行业存在的问题及收费是否合理等现状。其次,使用Logistic回归统计模型分析影响人们选择教培机构的主要因素,发现人们选择教育培训机构主要考虑教培机构的名气、口碑、环境、师资等方面因素。最后,在调查及分析的基础上,给教培机构提出合适的建议。     

Bullying,education and earnings: Evidence from the National Child Development Study

We explore the effect of bullying at school on the educational attainment of a sample of individuals drawn from the British National Child Development Study (NCDS). Our empirical findings suggest that school bullying has an adverse effect on human capital accumulation both at and beyond school. Moreover; the impact of bullying on educational attainment at age 16 is found to be similar in magnitude to class size effects. Furthermore, in contrast to class size effects, the adverse influence of bullying on educational attainment remains during adulthood. In addition, being bullied at school influences wages received during adulthood as well as indirectly influencing wages via educational attainment.