再结晶法制备高纯超细Al2O3粉的研究

本文介绍了用一种再结晶技术制造高炖、超细Al_2O_3粉体的新方法。 将硫酸铝铵溶液(AA)滴入碳酸氢铵溶液(AHC),经过反应合成一种新的含铝化合物,碳酸氢铝铵(AACH),然后在高温下煅烧,生成超细Al_2O_3粉体。另外还采用了X射线,红外光谱,DTA,以及TEM等手段,研究了反应温度、浓度、PH值和老化条件等对生成物AACH和Al_2O_3的影响。     

Y-TZP/Al_2O_3超细粉末的研究

用共沉淀法制备了3mol％Y_2O_3-ZrO_2-20Wt％Al_2O_3超细粉末。利用热分析、X射线、粒度分析仪、透射电镜和扫描电镜等研究了粉末的性能。实验结果表明:制备的粉末组分均匀,颗粒粒度为10nm,粒度分布窄,团聚体尺寸小,烧结活性高。粉末的相组成为t-ZrO_2。烧结体显微结构致密细晶,具有优异的力学性能。     

Formation of metal fog during molten salt electrolysis observed in a see-through cell

Visual observations of several molten salt electrolysis processes were made in a two-compartment, see-through quartz cell. The electrolyses of aluminium, magnesium, lead, zinc, sodium and potassium were studied. The colour of the melt in the anode compartment was pale yellow for fluoride-chloride melts and red for chloride melts, caused by the presence of dispersed anode gases during electrolysis. In the cathode compartment, streamers of metal fog were formed. The colours of the metal fog were purple for aluminium, grey for magnesium, lead and zinc, blue for sodium and green for potassium.The metal fog tended to sink to the bottom of the cell, which indicated that it had a higher density than that of the melt. The metal fog also penetrated into the anode compartment, probable due to convection and diffusion in the melt. The most probable explanation of the nature of the metal fog is that it consisted ofdispersed metal particles. This chemically unstable phase dissolved easily in the melt and was oxidized quickly by the anode gases.     

浸渍法改性活性炭脱硫(H2S)研究

针对普通脱硫剂的硫容较小的问题，我们利用浸渍液对活性炭进行改性试验。结果表明，用7％的碳酸钠(Na2CO3)溶液作为浸渍液对活性炭改性制得的脱硫剂比普通纯活性炭脱硫剂的硫容提高近30％。试验还考查了浸渍液种类、浸渍液浓度、温度对脱硫效率的影响。     

开发利用校友资源 有效促进大学生就业

校友资源是高校的一种特殊资源和宝贵财富,具有丰富性、潜在性、可持续性和经济性等特性。提出了高校合理开发和充分利用校友资源,有效促进大学生就业的对策。     

Additive-aided electrochemical deposition of bismuth telluride in a basic electrolyte

A new basic electrolyte with two cationic plating additives,polydiaminourea and polyaminosulfone,was investigated for the electrochemical deposition of the bismuth telluride film on a nickel-plated copper foil.Tellurium starts to deposit at a higher potential(-0.35 V) than bismuth(-0.5 V) in this electrolyte.The tellurium-to-bismuth ratio increases while the deposition potential declines from-1 to-1.25 V, indicating a kinetically quicker bismuth deposition at higher potentials.The as-deposited film featu...     

高校图书馆管理模式探讨

提高高校图书馆的管理效益和水平,必须使高校图书馆的管理观念从科学管理转为信息资源管理;管理模式的体制、结构、服务内容、操作以及人员知识结构必须适当改变,以适应信息资源的要求。     

Bioleaching of chalcocite by mixed microorganisms subjected to mutation

Mixed microorganisms with elevated activity of chalcocite-leaching were screened by mutation methods. The original microorganisms collected from acid mine drainage of different sites were mixed and then treated with mutagens NO₂⁻, diethyl sulfate (DES), UV and their combinations, respectively. Five groups of mixed microorganisms with much stronger ore-leaching ability were obtained by screening on the leaching media. Among them, group E of mixed microorganisms (treated with 1% DES for 60 min) with the best performance on chalcocite-leaching, increases the content of Cu²⁺ by 101.4% in 20 d of leaching compared with the control culture. In addition, group E is more tolerant to Cu²⁺ in media than the control without mutation treatment. Analysis for the diversity of microbial clones indicates that half of operational taxonomic units (OTUs) in group E are Acidithiobacillus ferrooxidans. These observations suggest that group E might have potentials for industrial application. Foundation item: Project(50321402) supported by the National Natural Science Foundation of China; Project(2004CB619201) supported by the Major State Basic Research and Development Program of China     

重大建设项目信访风险评估探索与实践——以宁波市机场快速干道项目为例

信访作为具有中国特色的一种制度安排,在反映社情民意、为群众排忧解难、解决损害群众利益问题、维护社会和谐方面发挥着重要的作用。但实际工作中信访也面临着种种尴尬：集体上访、越级上访、反复上访等信访中种种不和谐音符反而成为影响社会稳定的因素。     

理想与绝望——《伤逝》的哲理叙事

<伤逝>围绕着理想与绝望这一人生核心问题,通过涓生与子君人生理想终极悖论的层层设置,不断突围和最终否定,阐释出无论是人生理想、反抗,还是绝望,都应清醒地把握当时的社会现状与自我的人生状况.文本准确地剖析了当时的社会与人生,把人生哲理和当时社会现实紧紧结合在一起,让读者透过时代脉搏的律动,感受人生的真谛.