三光气为SET-LRP引发剂制备聚甲基丙烯酸甲酯的研究

末端官能化聚合物具有重要的应用价值。本文以三光气为单电子转移活性自由基聚合（SET-LRP）的引发剂,甲基丙烯酸甲酯（MMA）与丙烯酸甲酯（MA）为单体,Cu粉为催化剂,三苯基膦作配体,制备了聚甲基丙烯酸甲酯（PMMA）和聚丙烯酸甲酯（PMA）。在优化条件下,MMA的转化率可达到64.1%。     

Developing a genome-wide selection model for genetic improvement of residual feed intake and carcass merit in a beef cattle breeding program

Residual feed intake (RFI) and carcass merit (CM) are both complex traits emerging as critical targets for beef genetic improvement.RFI and CM traits are difficult and expensive to measure and genetic improvement for these traits through traditional selection methods is not very effective.Therefore,genome-wide selection using DNA markers may be a potential alternative for genetic improvement of these traits.In this study,the efficiency of a genome-wide selection model for genetic improvement of RFI and CM was assessed.The Illumina Bovine50K bead chip was used to genotype 922 beef cattle from the Kinsella Beef Research Ranch of the University of Alberta.A Bayes model and multiple marker regression using a stepwise method were used to conduct the association test.The number of significant SNP markers for carcass weight (CWT),carcass back fat (BF),carcass rib eye area (REA),carcass grade fat (GDF),lean meat yield (LMY),and residual feed intake (RFI) were 75,54,67,57,44 and 50,respectively.Bi-variate analysis of marker scores and phenotypes for all traits were made using DMU Software.The genetic parameter for each trait was estimated.The genetic correlations of marker score and phenotype for CWT,BF,REA,GDF,LMY and RFI were 0.75,0.69,0.87,0.77,0.78,and 0.85,respectively.The average prediction accuracies of phenotypic EBV for the six traits were increased by 0.05,0.16,0.24,0.23,0.17 and 0.19,respectively.The results of this study indicated that the two-trait marker-assisted evaluation model used was a suitable alternative of genetic evaluation for these traits in beef cattle.     

河北省财经类高校毕业生就业现状调查及对策分析

通过对河北省财经类毕业生就业政策、职业生涯规划、自主创业、就业期望值、求职渠道等方面的抽样调查和分析,加大国家就业政策宣传力度,指导毕业生科学地进行职业生涯规划,树立自主创业意识,树立正确的择业观,增强实践及动手能力,培养良好的思想道德素质等,是从根本上解决河北省财经类毕业生就业问题的有效途径。     

Molecular and engineering approaches to regenerate and repair teeth in mammals

Continuous replacement of teeth throughout the lifespan of an individual is possibly basal for most of the vertebrates including fish and reptiles; however, mammals generally have a limited capacity of tooth renewal. The ability to induce cellular differentiation in adults to replace lost or damaged cells in mammals, or to tissue-engineer organs in vitro, has hence become one of the major goals of regenerative medicine. In this article, we will revisit some of the important signals and tissue interactions that regulate mammalian tooth development, and will offer a synopsis of the latest progress in tooth regeneration and repair via molecular and engineering approaches. It is hoped that this article will not only offer an overview of recent technologies in tooth regeneration and repair but will also stimulate more interdisciplinary research in this field to turn the pursuit of tooth regeneration and repair into practical reality.     

基于LabVIEW的光纤低相干动态光散射实验系统

采用虚拟仪器开发软件LabVIEW设计了可用来对浓厚介质的相关特性进行准确测量的光纤低相干动态光散射实验系统,并在单散射区域以及不同的温度条件下对标准聚苯乙烯悬浮液进行了实验测量,均取得了较好的测量效果。     

对人文学院旅游管理专业发展的思考

为了促进攀枝花学院旅游管理专业的进一步发展,本文从扩大学生规模、提高教学质量、走产学研之路、打造专业特色、推行"双证书"制度等方面,提出了相关建议。     

制造系统的协调度分析

首先通过分析制造系统的构成与运行机制,建立了包括目标协调、结构协调与运行协调在内的制造系统协调度模型;然后对各因素分别进行量化,融合多项系统宏观性能参数建立整体协调度的量化计算方法;最后以某电子制造企业生产经营数据为例进行实例计算.计算结果表明,采用协调度进行制造系统综合性能评价是正确与可行的.     

A facile and general approach for the synthesis of fluorescent silica nanoparticles doped with inert dyes

A general and facile approach was developed for the synthesis of almost monodisperse fluorescent silica nanoparticles (NPs) doped with inert dyes, which are organic fluorophores that are strongly fluorescent but are hydrophobic or lack a covalent binding group. The prepared NPs were mesoporous and the dye molecules were encapsulated in the pores via hydrophobic interaction with the CTAB template. The NPs were stable and highly fluorescent in aqueous solution, and have potential applications in bioanalysis a...     

日本动画片中的物哀思想与死亡赞歌

日本动画片中洋溢的浓郁民族性一直是日本动画的显著特点,其中,物哀思想和对死亡的赞美充斥其中。日本动画片中体现物哀思想的唯美、颓废,死亡场面充满绝艳,美到让人窒息。这些带有病态特点的审美却成为吸引众多青少年的＂亮点＂,引人深思。如何批判的看待这一现象与如何借鉴日本动画片中民族性的表达对于我们当下的动画创作同样具有启迪和教训。     

论社会主义核心价值体系的引领机制建设

社会主义核心价值体系是社会主义意识形态的本质体现,在我国政治文化生活中居于统领、引导地位,具有引领社会思潮的强大功能,需要建立有效的引领机制解决＂怎样引领＂的问题。从理论上和实践上分别构建交流整合机制和实践反馈机制,从而将其引领功能渗透于社会结构机体,实现对我国主流意识形态的成功引领。