高职院校学风影响因素调研

学风建设是高职院校学生工作的重点,影响着高职院校的人才培养质量,也影响着高职院校的声誉和竞争力。随着我国高等教育的发展,高职院校学生群体特征不断变化,给高职院校学风建设带来了新问题。及时了解学校学风状况,探究影响高职院校学风的因素,深刻研究学生的学习目的和学习动机等方面存在的问题,进而采取有效措施推动学风建设,成为高

生态批评、后人类主义与有关文化的生物学思想

随着生物学领域有关其他动物文化研究的推进,我们有必要对人文主义的文化意识这一人文学科的核心观念提出质疑。文章通过探讨数个有关动物文化的生物学研究案例,提出了当今生态批评和后人类主义在文化观念上面临的问题;在追溯问题的根源的同时,指出生态批评、后人类主义乃至整个人文学科需要一个更广泛也更细微的文化观念,即一种无物种歧视的多元文化主义观念

护士倒班前后智力活动的比较

受试者为20—35岁倒班和正常白班护士共46名。倒班组在上小夜班前和次日大夜班后分别给予一次智力活动测验,正常白班组两次测验的时间和时间间隔与倒班组相同。测验结果表明:倒班组两次测验仅在“数字符号”项目有部分显著性差异;而正常白班第二次测验在“数字符号”和“计数”两个项目,均较第一次测验取得显著进步。这提示倒班对于注意、记忆和反应操作速度可能有些影响

Synthesis and structural analysis of 2-mercaptonicotinic acid oxovanadium(Ⅴ)

目的合成新型有机羧酸氧钒配合物——2-巯基烟酸氧钒(V)配合物。方法以V2O5、2-巯基烟酸等为原料,采用水热法制备,以热重分析法、红外光谱、紫外光谱、原子吸收光谱和质谱对其结构进行初步确证。结果合成产物为淡黄色结晶,其红外光谱图上有3 093--2 879、1 566、1 683、1 446、881 CM-1等多处特征吸收峰,紫外吸收光谱在350 nM出现强的π→πx吸收,配合物元素分析数据、结构参数与计算值相符合。结论所合成的配合物为目标配合物。Objective To synthesize and identify 2-mercaptonicotinic acid oxovanadium(Ⅴ) complex.Methods 2-mercaptonicotinic acid oxovanadium(Ⅴ) complex were synthesized with the hydrothermal method.Its chemical structure was determined by thermogravimetric analysis,IR,UV and atomic absorption spectra.Results Pale yellow crystals of 2-mercaptonicotinic acid oxovanadium(Ⅴ) complex were obtained with characteristic absorption peaks at 3 093-2 879、1 566、1 683、1 446、881 cm-1 in IR,and along with strong π→π× absorption at 350 nm in UV.The complex′s elemental analysis and structural data were identical with calculated results.The crystals had special morphometry through preliminary study,and its diagrammatic sketch of crystal structure was simulated.Conclusions 2-mercaptonicotinic acid oxovanadium(Ⅴ) complex were synthesized successfully

伺服运动控制器的调试方法研究

数控机床各进给轴伺服驱动器的参数设置是机床整机调试的一项重要工作。合理的参数设置,是保证机床的加工精度、运行平稳性等基本性能的关键因素之一。通过具体的实践总结,介绍伺服驱动器相关参数设置的基本原则、方法和过程,为数控机床厂商及用户的设备调试与维护提供良好的借鉴

Iron and manganese oxides enhance electron output efficiency of Clostridium pasteurianum

[Background] Fermentative dissimilatory metal-reducing bacteria, which are capable of reducing metallic oxides, get energy from fermentation. Little is known about how metallic oxides affect electron output efficiency of fermentative dissimilatory metal-reducing microorganisms. [Objective] This study was conducted to explore the influence of iron and manganese oxides (Fe_2O_3/MNO_2) on electron output efficiency. [Methods] Different concentrations of Fe_2O_3/MNO_2 were added into fermented system containing glucose and inoculated 5% C. pasteurianum. Electrochemical activity of C. pasteurianum was detected. The concentrations of Fe(Ⅱ) and Mn(Ⅱ) were measured by ferrozine spectrophotometry and formaldoxime method. Fermentation substrate and metabolites of C. pasteurianum were detected by gas chromatography and high performance liquid chromatography. Lastly, we calculated the electron output efficiency. [Results] The current density peaked with the value of about 0.93 mA/m~2. The concentrations of Fe(Ⅱ) and Mn(Ⅱ) gradually accumulated. The consumption of glucose was increased by 9.4%/7.7%, Meanwhile, acetate production was increased by 37.5%/25.0%, and butyrate production was increased by 22.7%/6.8%. Additionally, hydrogen production was increased by 21.6%/9.8%, and the total electron output efficiency was increased by 24.27%/10.82%, respectively. The pH values between experimental group and control are no significant difference. [Conclusion] This study shows that iron and manganese oxides can improve the electron output efficiency of C. pasteurianum by increasing glucose consumption and buffering pH value. The results provide evidence for revealing the effects of multivalent metal oxides on the electron output of fermentative dissimilatory metal-reducing bacteria, and further expand our understanding of the interaction mechanism between multivalent metal oxides and fermentative dissimilatory metal-reducing bacteria.</p

甲壳胺与聚乙烯醇共混纤维

将甲壳胺与聚乙烯醇进行湿法纺丝得共混纤维 ,并将纤维进一步缩醛化 .缩醛化增加了共混纤维的强度 ,这是由于缩醛化使分子间形成亚甲基桥键以及减少了纤维内空洞所致 .扫描电镜观察还表明缩醛后的共混纤维有较好的断裂韧性 .实验表明强度和密度最大值的共混比为 (10 %～2 0 % ) /(90 %～ 80 % ) (甲壳胺 /聚乙烯醇

天然高分子甲壳素类纤维的研究进展

:综述了甲壳素及其衍生物纤维的制备和性能 .介绍了制备甲壳素纤维的黄化法、含卤溶剂法和酰胺 氯化锂法 .总结了壳聚糖纤维制备的一般方法和性能 .简要介绍了甲壳素 /壳聚糖酯类和醚类衍生物的纤维 .讨论了甲壳素类纤维的应