肼还原法制备镍纳米粒子及其机理

在乙二醇中用肼作还原剂还原Ni2 制备镍纳米粒子。用X射线衍射仪测定出产物的相结构,用扫描电子显微镜观察产物的微观结构。根据反应现象和产物的相结构,研究温度、pH值调节剂种类和pH值对镍纳米粒子形成的影响,并推断其形成机理。研究结果表明,用肼作还原剂还原Ni2 制备纳米Ni的最佳反应温度为60℃,用NaOH作pH值调节剂调pH值到10～11得到的镍纳米粒子为体心立方结构,平均粒径为25nm。在Ni纳米粒子的形成过程中,NaOH不仅起到调节pH值的作用,还起催化作用。     

硫酸生产废水中除砷方法探讨

对硫酸生产中净化工序废水进行处理，根据其含砷量多少，介绍其处理方法、工艺流程及机理，经处理后的污水均可达到国家排放标准，并可取得良好的环境效益、经济效益和社会效益。     

植物对土壤重金属污染修复的研究进展

对植物提取、植物钝化和植物挥发等植物修复技术类型及植物修复机理,包括植物本身分泌特殊物质来螯合溶解难溶性金属;通过某些微生物或微生物与植物的共生体促进植物对重金属的吸收;通过一些土壤改良措施如螯合剂、酸性肥料等的施用增加重金属的有效性,从而提高植物对重金属的提取效率等做了简要论述。分析了目前该研究领域存在的主要问题,以期为修复重金属污染土壤的研究和实践提供参考。     

大学生党建工作的理念创新与机制创新初探

当前，大学生党建工作面临许多新情况、新问题，也面临着许多新的挑战，大学生党建工作要适应新形式的发展变化，需要在理念和机制等方面进行创新和改进，使大学生党建工作进一步形成科学化工作模式，增强大学生党建工作的时代感，努力开创大学生党建工作的新局面。     

高校体育教学中场馆资源的开发利用

运用文献资料法对课程资源、体育课程资源的概念做了整理与分析,阐述了目前高校体育课程资源中场馆资源的开发利用存在的问题,并提出了一些建议,为高校体育场馆资源的开发利用提供了一定参考意见。     

传统产业高新技术化的动力机制

从企业的利润最大化目标出发,论述了市场需求拉力、市场竞争压力、技术创新与技术中介的推动力以及政府行为支撑力在企业的技术创新与企业的技术改造中的作用;各动力间相互关联、相互促进的机理及其反馈、放大效应;构建了传统产业高新技术化的动力机制模型。     

长江经济带协调发展模式及机制创新

阐述了长江经济带协调发展的基本内涵。从发展模式和机制创新两个方面分析了促进长江经济带协调发展的思路:提出非均衡协调发展模式;实施培育和增强区域竞争力的区域政策,提高区域生产率及竞争力;建立和完善7方面的机制创新。     

Fabrication and superconducting properties of nano-SiC doped MgB2 tapes

Nano-SiC doped MgB2 tapes were prepared by the in situ powder-in-tube method. Heat treatment was performed at 650℃ for 1 h. XRD data indicate that SiC particles had reacted with the MgB2 during sintering process. MgB2 core seemed to be denser after SiC doping, and the critical temperature was slightly depressed. The critical current density Jc of the SiC doped tapes was significantly enhanced in magnetic fields up to 14 T compared to the undoped ones. For the 5% SiC doped samples, Jc was in- creased by a factor of 32 at 4.2 K, 10 T. The enhancement of Jc-B properties in SiC doped MgB2 tapes is considered to be due to the enhancement of grain linkages and the introduction of effective flux pining centers. The substitution of B by C in MgB2 grains is thought to be the main reason for the improve- ment of the flux pinning ability in SiC doped MgB2 tapes.     

Mechanism of the interaction between Au nanoparticles and polymerase in nanoparticle PCR

Nanoparticle PCR is a novel method to optimize DNA amplification. It performs well in improving specificity, enhancing sensitivity and speed. Several mechanisms were proposed in previous studies: one was based on the interaction between gold nanoparticles (AuNPs) and DNA while the other was attributed to the heat transfer property of AuNPs. In this paper, we propose that the interaction between AuNPs and DNA polymerase can significantly influence PCR. First, the addition of DNA polymerase can eliminate the inhibitory effects of excess AuNPs. Second, the addition of AuNPs will increase yield of the desired PCR product and make the optimum concentration of DNA polymerase move to higher value. Third, while excess polymerase might inhibit amplification efficiency, AuNPs can reverse this process and the yield of PCR amplification. Based on these results we propose a possible mechanism that AuNPs might modulate the activity of polymerase and improve PCR amplification.     

浅析大学生反社会行为矫正机制的缺陷

在市场经济的大潮下,纷繁复杂的社会环境容易引起大学生反社会行为的产生,而我国大学生反社会行为的现行矫正机制存在着许多缺陷,主要表现为立法不完善、适用程序不规范、矫正机构不统一、矫正措施不恰当、矫正社会化程度不高等五个方面。