两性聚丙烯酰胺的合成方法及应用进展

结合国内外研究情况，从技术路线和实施方法两个角度着重阐述了制备两性聚丙烯酰胺的方法，同时简单介绍了其应用情况，并对今后的研究工作提出了一些建议。     

氟化铝生产废水处理工艺的研究

对氟化铝生产废水的处理方法进行了研究。结果表明，一级中和沉淀法和二级中和二级沉淀法均不宜用于氟化铝生产废水的结果，理想的处理方法是碱过量中和酸回调法，辅加氯化钙的石灰乳中和法也可考虑采用。     

碱式硫酸镁晶须的合成及应用

以一定浓度的MgSO4和NaOH溶液为原料,在常温下混合,在160℃,0.5 MPa的条件下用水热法反应8 h,制备出增强阻燃材料MgSO4.5Mg(OH)2.3H2O型碱式硫酸镁晶须(MOS),探讨了反应条件对产物形貌、结构及组成的影响,初步确立了制备MOS的工艺条件。经过对复合材料的拉伸性能测试得出结论,采用MOS填充改性的聚丙烯,优于市售纳米氢氧化镁和阻燃级氢氧化镁。     

CB20砖和硅莫砖在我厂回转窑上的应用

浩良河水泥厂1995年6月投产的φ3.95m×560m新型干法回转窑生产线,设计产量2000t/d,经技改后目前产量最高达到2400t/d,运行效益良好。在回转窑节能提产的过程中,窑衬也经过了不断的     

N－甲基氧化吗啉的合成研究

以吗啉为原料分二步合成Ｎ－甲基氧化吗啉，讨论了温度、催化剂、时间等因素对反应结果的影响，并提出处理未反应的双氧水的有效方法。     

Structural and transport effects of doping perfluorosulfonic acid polymers with the heteropoly acids, H3PW12O40 or H4SiW12O40

A perfluorosulfonic acid (PFSA) polymer with pendant side chain -O(CF₂)₄SO₃H was doped with the heteropoly acids (HPAs), H₃PW₁₂O₄₀ and H₄SiW₁₂O₄₀. Infrared spectroscopy revealed a strong interaction between the HPA and the PFSA ionomer. Modes associated with the peripheral bonds of the HPA were shifted to lower wave numbers when doped into PFSA membranes. Small-angle X-ray scattering (SAXS) measurements showed the presence of large crystallites of HPA in the membrane with d spacings of ca. 10 Å, close to the lattice spacing observed in bulk HPA crystals. Under wet conditions the HPA was more dispersed and constrained the size of the sulfonic acid clusters to 20 Å at a 5 wt% HPA doping level, the same as in the vacuum treated ionomer samples. Under conditions of minimum hydration the HPA decreased the E_a for the self-diffusion of water from 27 to 15 kJ mol⁻¹. The reverse trend was seen under 100% RH conditions. Proton conductivity measurements showed improved proton conductivity of the HPA doped PFSAs at a constant dew point of 80 °C for all temperatures up to 120 °C and at all relative hummidities up to 80%. The activation energy for proton conduction generally was lower than for the undoped materials at RH ≤80%. Significantly the E_a was 1/2 that of the undoped material at RHs of 40 and 60%. A practical proton conductivity of 113 mS cm⁻¹ was observed at 100 °C and 80% RH.     

Maximum principle for mean-field jump–diffusion stochastic delay differential equations and its application to finance

This paper investigates a stochastic optimal control problem with delay and of mean-field type, where the controlled state process is governed by a mean-field jump–diffusion stochastic delay differential equation. Two sufficient maximum principles and one necessary maximum principle are established for the underlying system. As an application, a bicriteria mean–variance portfolio selection problem with delay is studied to demonstrate the effectiveness and potential of the proposed techniques. Under certain conditions, explicit expressions are provided for the efficient portfolio and the efficient frontier, which are as elegant as those in the classical mean–variance problem without delays.     

Dietary fatty acids regulate cholesterol induction of liver CYP7α1 expression and bile acid production

In the present study we investigated the effects of dietary fats containing predominantly PUFA, monounsaturated FA (MUFA), or saturated FA (SFA) on lipid profile and liver cholesterol 7α-hydroxylase (CYP7α1) mRNA expression and bile acid production in C57BL/6J mice. The animals (n=75) were randomly divided into five groups and fed a basic chow diet (AIN-93G) (BC diet), a chow diet with 1g/100g of cholesterol (Chol diet), a chow diet with 1g/100g of cholesterol and 14g/100g of safflower oil (Chol+PUFA diet), a chow diet with 1g/100g of cholesterol and olive oil (Chol+MUFA diet), or a chow diet with 1g/100g of cholesterol and myristic acid (Chol+SFA diet) for 6 wk. The results showed that the Chol+SFA diet decreased CYP7α1 gene expression and bile acid pool size, resulting in increased blood and liver cholesterol levels. Addition of PUFA and MUFA to a 1% cholesterol diet increased the bile acid pool production or bile acid excretion and simultaneously decreased liver cholesterol accumulation despite decreased CYP7α1 mRNA expression. The results indicate that the decreased bile acid pool size induced by the SFA diet is related to inhibition of the liver CYP7α1 gene expression, but an increased bile acid pool size and improved cholesterol homeostasis are disassociated from the liver CYP7α1 gene expression.     

Lewis酸存在下的自由基共聚合——Ⅰ.GeCl_4与BCl_3存在下的乙酸乙烯酯与丙烯酸交替共聚

乙酸乙烯酯(VAc)与丙烯酸(AA)在GeCl_4及BCl_3存在下通过自由基聚合可得到交替共聚物。对GeCl_4体系,聚合反应速率正比于[引发剂]~(0.5)。当VAc/AA=1:1(mol比)时有最大反应速率。CCl_4对本聚合反应无链转移作用。通过紫外光谱分析可证实VAc及AA均与GeC\(?)生成络合物;ESR分析表明,络合AA自由基较未络合AA有较强的阳离子特性,交替共聚的原因可能与络合AA自由基及活化单体络合物二者有关。     

加热炉用喷补料的研制及应用

介绍了ＨＹＪ—０１喷补料的实验室研制及工业应用。实践表明，该喷补料粘接强度好，抗热震性好。喷补衬使用时间已超过１４个月，无明显破损现象。