地方行业高校人才培养质量的“应为”探析

30年的改革开放,使中国的高等教育经历了大改革、大发展与大提高,且已进入到大众化教育的新阶段。加强内涵建设、提高人才培养质量成为当前高等教育的核心任务。结合地方行业高校自身的办学实际,通过深入分析人才培养质量的内涵,提出了地方行业高校应坚持"有所为,有所不为"的办学思路,从办学定位、办学理念、办学特色、人才培养模式调试、政策制定等方面准确把握,切实提高地方行业高校人才培养质量的具体措施。     

BAF-L Modulates Histone-to-Protamine Transition during Spermiogenesis

Maturing male germ cells undergo a unique developmental process in spermiogenesis that replaces nucleosomal histones with protamines, the process of which is critical for testicular development and male fertility. The progress of this exchange is regulated by complex mechanisms that are not well understood. Now, with mouse genetic models, we show that barrier-to-autointegration factor-like protein (BAF-L) plays an important role in spermiogenesis and spermatozoal function. BAF-L is a male germ cell marker, whose expression is highly associated with the maturation of male germ cells. The genetic deletion of BAF-L in mice impairs the progress of spermiogenesis and thus male fertility. This effect on male fertility is a consequence of the disturbed homeostasis of histones and protamines in maturing male germ cells, in which the interactions between BAF-L and histones/protamines are implicated. Finally, we show that reduced testicular expression of BAF-L represents a risk factor of human male infertility.     

反应介质对芝麻林素转化生成芝麻素酚的影响

以干燥的甲苯、石油醚、丙酮为反应介质,研究不同反应介质对磷钨酸催化芝麻林素转化生成芝麻素酚的影响。在反应温度55℃,反应底物浓度3 mmol/L,催化剂用量0.5 g/L的条件下,分别在不同时间取样并利用HPLC分析芝麻素酚的生成率和反应进程,结果表明:在研究时间内,不同介质中芝麻素酚生成率依次为石油醚(26.3%)丙酮(18.4%)甲苯(15.2%),且石油醚为介质的反应中生成的副产物少,因此选择石油醚作反应介质,并在下一步研究中优化反应条件,以期提高芝麻素酚的生成率。     

PBO与T700纤维及其复合材料的性能研究

本文对具有21世纪超级纤维之称的PBO纤维与目前在先进复合材料中广泛使用的T-700碳纤维性能进行了比较。实验数据表明，PBO纤维在高性能纤维中强度最高。但PBO纤维复合材料层间剪切强度低于芳纶纤维复合材料，这是由于PBO纤维未经表面处理，纤维表面的活性低而且较光滑所致。     

内积空间中的互不偏基

将量子信息理论中的互不偏基概念进行了代数化,在内积空间中引进和推广了互不偏基的概念,讨论了欧氏空间中的相关性质,并分别在欧氏空间和酉空间中给出互不偏基的例子.     

绶草营养器官解剖结构研究

利用石蜡切片和徒手切片,在光学显微镜下,观察了绶草根、茎、叶的形态结构。结果表明：绶草的叶是等面叶,上下表皮细胞都有较厚的角质层以及加厚的外壁,上表皮无气孔,而下表皮则分布着结构特殊的气孔器且数量很多,在个别叶肉组织细胞中分布有针晶簇;根内皮层细胞径向面强烈加厚,凯氏点非常明显。根中央被一个大导管所占据;茎由表皮、基本组织,机械组织和维管束组成;维管束排列成两轮,分布在基本组织中。     

球笼烯(C_(60))的研究及应用新进展

回顾了球笼烯的研究并介绍其应用进展。     

驱油用聚丙烯酰胺溶液界面特性研究

使用 TRACKR全自动液滴界面张力仪测量了不同试验条件下十二烷 /聚丙烯酰胺溶液界面扩大、缩小时的流变特征及界面张力 ,开发出了用以表征液膜强度的界面黏弹性 E的测量方法。在十二烷 /聚丙烯酰胺界面形成稳定的过程中界面 (扩张 )黏弹模量不断增加 ,并逐渐达到恒定 ,其中弹性成分所占比例远大于黏性成分即 E′>E″。考察的聚合物浓度范围为 5 0～ 2 0 0 0 mg/ L ,界面黏弹模量从 1 7.6提高到 3 0 .6m N·m-1。放置 3 d后的聚合物溶液界面黏弹模量保留率为 82 .8%。实验结果表明聚合物浓度变化对界面张力影响不显著。     

Preparation and characterization of amphiphilic block copolymer of polyacrylonitrile‐block‐poly(ethylene oxide)

The synthesis of polyacrylonitrile‐block‐poly(ethylene oxide) (PAN‐b‐PEO) diblock copolymers is conducted by sequential initiation and Ce(IV) redox polymerization using amino‐alcohol as the parent compound. In the first step, amino‐alcohol potassium with a protected amine group initiates the polymerization of ethylene oxide (EO) to yield poly(ethylene oxide) (PEO) with an amine end group (PEO‐NH₂), which is used to synthesize a PAN‐b‐PEO diblock copolymer with Ce(IV) that takes place in the redox initiation system. A PAN‐poly(ethylene glycol)‐PAN (PAN‐PEG‐PAN) triblock copolymer is prepared by the same redox system consisting of ceric ions and PEG in an aqueous medium. The structure of the copolymer is characterized in detail by GPC, IR, ¹H‐NMR, DSC, and X‐ray diffraction. The propagation of the PAN chain is dependent on the molecular weight and concentration of the PEO prepolymer. The crystallization of the PAN and PEO block is discussed. © 2003 Wiley Periodicals, Inc. J Appl Polym Sci 89: 1753–1759, 2003     

纳米微珠二氧化硅用量对空气弹簧用天然橡胶胶料性能的影响

将纳米微珠二氧化硅添加至空气弹簧用天然橡胶（NR）胶料中,研究纳米二氧化硅用量对NR胶料的加工性能和物理性能以及空气弹簧耐疲劳性能的影响。结果表明：随着纳米微珠二氧化硅用量的增大,NR胶料的硫化特性和门尼粘度未发生明显变化,NR硫化胶的邵尔A型硬度先减小后增大,300%定伸应力无明显变化,拉伸强度和拉断伸长率呈减小趋势;当纳米微珠二氧化硅用量为10～15份时,NR硫化胶的耐屈挠性能较佳;在空气弹簧用NR胶料中加入10份纳米微珠二氧化硅能够有效地提高空气弹簧的耐常温疲劳性能和耐高温疲劳性能。