枯草杆菌碱性磷酸酶制备的最佳工艺条件及酶促反应动力学性质的研究

以枯草杆菌为菌种液体培养制备碱性磷酸酶，研究确定了培养的最佳工艺条件，并对碱性磷酸酶的酶促反应动力学性质进行了初步探讨。结果表明，枯草杆菌制备碱性磷酸酶的最佳工艺条件为：40℃，pH值7．4振荡培养10h，酶活最高。对碱性磷酸酶的动力学性质研究表明，该酶催化底物磷酸苯二钠水解反应的最适pH值8．8，最适温度52℃，米氏常数Km值为2．94mmol／L。     

疏水缔合类聚丙烯酰胺溶液性质研究

综述了疏水缔合类聚丙烯酰胺溶液性质的影响因素以及测定溶液微观形态的研究方法。     

N-萘乙酰基-N''''-邻甲氧基苯甲酰基氨基硫脲的合成与表征

利用α-萘乙酰基异硫氰酸酯与芳基酰肼的加成反应合成了一种新型的酰氨基硫脲衍生物--N-萘乙酰基-N'-邻甲氧基苯甲酰基氨基硫脲,其结构经元素分析、红外光谱、1HNMR和13CNMR所确证.     

钛合金化学镀镍工艺

采用一种含有氢氟酸的酸性溶液作为活化溶液,对钛合金表面进行化学镀镍。讨论了活化液、络合剂、Ni2 及H2PO2-浓度、缓冲剂及温度的确定。分别介绍了除膜、活化、预镀镍及化学镀镍工艺规范。对该镀镍层的耐蚀性及含磷量进行了测定,并对该镀层热处理前后的硬度、厚度、结合力、氢含量、耐磨损性及表面微观形貌进行了测试与比较。结果表明,采用本工艺可在钛合金表面沉积出70μm左右的镍磷合金镀层,磷含量在8%~11%(质量分数);氢含量可控制在50mg/kg;经200℃热处理1h后镀层硬度达到600HV,镀层与基体结合力好;经350℃热处理1h后镀层硬度达850HV,耐磨损性良好。该镀层可满足航空钛合金部件的要求。     

Bi2—xPbxSr2Ca2Cu3Oy系高Tc超导体相变的研究

用DSC研究了高T_e超导体B_(2-r)Pb_rSr_2Ca_2Cu_sO_v(x=0,0.2,0.4,0.6)从室温至600℃范围内的相变。在320℃和440℃附近有二个吸热蜂,每一个峰对应一个相变过程。440℃附近的相变是不可递的,其原子激活能为1.37eV,是由高T_e相向低T_e相的转变。而320℃附近的相变则与超结构的形成有关。     

新型干燥设备——直热式燃气纸浆模塑烘干线的设计和制造

介绍了以天然气为燃料的纸浆模塑烘干线的设计过程 ,以及该套设备的制造和安装要点。由于使用了清洁能源 ,所以该套设备能生产出清洁度较高的纸浆模塑包装制品 ,满足电子工业和食品工业对包装制品的要求     

Partial oxidation of methane to synthesis gas over α-Al2O3-supported bimetallic Pt–Co catalysts

The partial oxidation of methane to synthesis gas was studied at atmospheric pressure and in the temperature range of 550–800°C over -Al₂O₃-supported bimetallic Pt–Co, and monometallic Pt and Co catalysts, respectively. Both methane conversion and CO selectivity over a bimetallic Pt_0.5Co₁ catalyst were higher than those over monometallic Pt_0.5 and Co₁ catalysts. Furthermore, the addition of platinum in Pt–Co bimetallic catalysts effectively improved their resistance to carbon deposition with no coking occurring on Pt_0.5Co₁ during 80 h reaction. The FTIR study of CO adsorption observed only linearly bonded CO on bimetallic Pt–Co catalysts. TPR and XPS showed enhanced formation of a cobalt surface phase (CSP) in bimetallic Pt–Co catalysts. The origins of the good coking resistivity of bimetallic Pt–Co catalysts were discussed.     

i-PB/PP共混物和SP179型PP性能比较

比较了高全同聚丁烯-1/聚丙烯(i-PB/PP)共混物和SP179型PP的力学性能和微观结构。共混物的拉伸强度、屈服强度、断裂伸长率、弯曲模量等力学性能都要优于SP179,而韧性却大大低于SP179。SP179中乙烯嵌段对PP结晶影响较大,而共混物中i-PB对PP结晶影响较小;SP179可溶物中含有较多的抗氧剂,并且含有聚乙烯长嵌段;SP179的热稳定性优于共混物。     

氧化铁对硫铝酸钙矿物形成的影响

借助化学分析方法、X射线衍射、差示扫描量热法等测试手段研究了Fe2O3对无水硫铝酸钙矿物(C4A3S)形成过程的影响.研究表明:掺杂Fe2O3可促进熟料中游离氧化钙(f-CaO)的吸收,增加液相量,改善C4A3-S矿物生料的易烧性;不掺杂Fe2O3的矿物生料,C4A3-S单矿物在850℃以下几乎不生成,在1 000℃开始大量生成,在1 300℃达到最高值;掺杂1?2O3的试样中C4A3S含量与不掺杂试样在同温度下达到最大值,但绝对含量有一定幅度的下降;掺杂3%及5?2O3的试样中C4A3S含量在1 350℃达到最大值,达到最大值的时间比原来延迟0.5h,并且绝对含量有较大幅度的下降;掺杂Fe2O3的试样在1 200℃至1400℃时,Fe3 和C4A3-S中的Al3 发生置换,使Fe3 固熔到C4A3-S中形成固熔体C4(A0.95F0.05)6O12(SO4).     

Integrating a membrane and a fluidized pellet reactor for removing hardness: effects of NOM and phosphate

A novel treatment process combining a membrane with outside-in flow configuration and a fluidized pellet rector for removing hardness was studied. The effects of influent water quality, e.g., concentrations of natural organic matter (NOM) and phosphate along with the hydrophobicity of NOM, on the hardness removal efficiency of the novel process were investigated. The hardness removal efficiency decreases with increasing NOM concentration. However, the NOM removal efficiency is independent of NOM concentration and is related to the hydrophobicity of NOM samples. Raw water containing phosphate has adverse impact on the hardness removal efficiency, which decreases from 85% for treating water containing no phosphate to only 38% and 14% for water containing 0.33 mg/L and 1.63 mg/L of phosphate, respectively.