高硫化氢合成气制甲硫醇新型钼基催化剂研究

研究了一系列负载型钼基催化剂催化含高硫化氢合成气制甲硫醇的性能 ,用XPS和ESR对其进行表征 .活性测试显示 ,钾促进的钼基催化剂催化的反应产物中甲硫醇成为主导产物 .几种钼基催化剂合成甲硫醇的活性大小顺序 :K2 MoO4/CoO/SiO2 >K2 MoO4/SiO2 >MoO3 /K2 CO3 /SiO2 >K2 MoS4/SiO2 >MoS2 /K2 CO3 /SiO2 .ESR表征显示 ,反应后的催化剂可以检测到“oxo Mo(V)”和“thio Mo(V)”物种 .XPS表征显示反应后催化剂中的Mo包含着Mo4+ ,Mo5+ 和Mo6+ ,S包含着S2 -,(S—S) 2 -和S6+ 三种价态 .添加CoO后 ,“oxo Mo(V)”含量减少 ,而“thio Mo(V)”含量增加 ,(S—S) 2 -物种的生成得到抑制 ,S2 -物种的量增多 .(Mo4+ +Mo5+ ) /Mo6+ 峰强度比为 0 75以及S2 -/(S—S) 2 -接近 1有利于甲硫醇的生成 .本文提出甲硫醇的合成与“Mo S K”相关联的反应机

Glow discharge growth of SnO2 nano-needles from SnH4

Single crystalline SnO2 nano-needles with length up to 6-7 mum and diameter less than 300 nm are synthesized on an Au-coating porous silicon substrate from SnH4 source via a glow discharge process

Preparation and self-assembly of copper nanoparticles via discharge of copper rod electrodes in a surfactant solution: a combination of physical and chemical processes

地址: 1. Xiamen Univ, Dept Chem, State Key Lab Phys Chem Solid Surfaces, Xiamen 361005, Peoples R China 电子邮件地址: [email protected] nanoparticles with a mean diameter of 10-15 nm were prepared and self-assembled via discharge of bulk copper rods in a cetyltrimethylammonium bromide (CTAB)/ascorbic acid solution. Ascorbic acid was used as a protective agent to prevent the nascent Cu nanoparticles from oxidation in the solution;, otherwise spindle-like Cu2O/CuO structures, with a lateral dimension of 30-50nm and length of up to 100nm, were formed in pure deionized water. The surfactant CTAB had a critical influence on self-assembly of spherical Cu nanostructures (with diameter of 700 nm-1mum). Such a low-temperature and non-vacuum method, exhibiting the characters of both physical and chemical processes, provides a versatile choice for economical preparation and assembly of various metal nanostructures. (C) 2004 Elsevier Inc. All rights reserved

Novel Mo-based catalysts for methanethiol synthesis from high H2S-containing syngas

A series of supported Mo-based catalysts for methanethiol synthesis from high H2S-containing syngas were investigated by kinetics and XPS, ESR characterization. The activity evaluating results show that upon the potassium-promoted Mo-based catalysts, the methanethiol will become dominant product of the reaction, and the activity sequence of several Mo-based catalysts for the reaction is as follows: K2MoO4/CoO/SiO2 > K2MoO4/SiO2 > MoO3/K2CO3/SiO2 > K2MoS4/SiO2 > MoS2/K2CO3/SiO2. In the ESR characterization of the catalysts used the resonant signals of "oxo-Mo(V)" and "thio-Mo(V)" can be detected. The XPS characterization indicates that mixed valence Mo species Mo4+, Mo5+ and Mo6+ and three kinds of S species S2-, (S-S)(2-) and S6+ exist in the catalysts. As a promoter CoO was introduced into Mo-based catalysts. It was observed that the addition of CoO leads to decrease of the amount of "oxo-Mo(V) " in the catalysts, but increase of the amount of "thio-Mo(V)", which may be connected with "Mo-S-K" phase or "Co-Mo-S-K" phase, meanwhile CoO in die catalyst was found to enhance the formation of S2-, but inhibit the formation of (S-S)(2-). It was found also that the methanethiol synthesis is favored if the peak intensity ratios of (Mo4+ + Mo5+)/Mo6+ and S2-/(S-S)(2-) are kept at about 0.75 and 1 level respectively. A possible mechanism about the relationship of CH3SH formation with "Mo-S-K" phase was proposed

银鲫与彩鲫卵母细胞cDNA文库构建及周期蛋白A_1的cDNA克隆

分别取行天然雌核发育繁殖的银鲫和两性生殖的彩鲫的卵母细胞为材料 ,提取总RNA ,分离mRNA ,进而反转录合成cDNA并定向插入λgtllSfi Not克隆载体 ,经体外包装构建了银鲫与彩鲫卵母细胞的表达型cDNA文库。测试结果表明库容量分别达到 3 1× 1 0 6(银鲫 )和 1 6× 1 0 6(彩鲫 )。进一步人工合成CyclinA1 保守引物 ,采用PCR扩增文库的方法 ,克隆了银鲫 (1 61 6bp)与彩鲫 (1 62 6bp)的CyclinA1 全长cDNA。序列分析结果表明 :两种鱼

玻璃体中碱性成纤维细胞生长因子的定量

目的: 定量研究增殖性玻璃体视网膜病变( PVR)患者玻璃体中碱性成纤维细胞生长因子( bFGF)的含量, 阐明 bFGF 在 PVR 中的作用和影响。方法: 双夹心酶联免疫吸附技术测定正常对照组 20 只眼、PVR-C 组 35只眼、PVR-D 组 26 只 眼和单纯玻璃体出血组 25 只眼患者玻璃体内 bFGF 含量, 以及 PVR-D 病人( 15 例)血清内 bFGF 含量 。结果:①玻璃体内 bFGF 含量: 对照组 median 5. 20 ng/L, quartile 15. 47 ng/L;PVR-C 组 median 3. 12 ng/L, quartile 10. 48 ng/L;PVR-D 组 median 46. 56 ng/L, quartile 113. 96 ng/L; 单纯玻璃体出血组 median 1. 40 ng/L, quartile 6. 25 ng/L;PVR -D 组玻璃体内 bFGF 含量明显高于对照组, 也高于 PVR-C 组和单纯玻璃体出血组(各 P <0. 01);②PVR-D 组血清内 bFGF 含量: ( 18. 33± 3. 39)ng/L;PVR-D 组玻璃体内 bFGF 含量明显高于其血清含量, P <0. 01; ③玻璃体内 bFGF 含量与裂孔面积的关系: 在 PVR-D 组,裂孔大于 1. 5 mm×1. 5 mm 组 bFGF 含量较高(P <0. 01)。结论: bFGF 在 PVR 发展中起重要作用

Economic Responsibility Audit and Local Government Governance:From the Perspective of Environmental Pollution

蔡春，西南财经大学会计学院教授、博士生导师，经济学博士，中国政府审计研究中心主任;谢柳芳,西南政法大学商学院教授，管理学博士，中国政府审计研究中心特约研究员；王彪华，中国审计学会秘书处副研究员，管理学博士。【中文摘要】在我国经济从高速发展向高质量发展阶段转化的新时期，生态文明建设至关重要。污染防治的治理成效与经济能否实现可持续健康发展、能否实现高速发展向高质量发展阶段转化密切相关。与此同时，用于污染防治的预算资金支出及生态文明建设责任逐渐成为预算执行审计、经济责任审计的监督对象和重点内容。通过2012—2016年省级地方政府数据，以环境污染为研究切入点,实证检验领导干部经济责任审计与地方政府治理的关系。研究结果表明：国家审计具有治理功能，经济责任审计强度越大，地方政府治理效率越高。同时，相较于市场化程度和法制水平较高的地区,经济责任审计对政府治理的促进效果在市场化程度和法制化程度较低的地区，其作用更为明显;从经济发展质量考察,经济责任审计对地方政府治理的积极作用主要发挥在高GDP增长组及低GDP水平组。进一步研究发现,地区环境污染问题越严重,经济责任审计投入力度越大，即国家审计能够识别并在审计实务中切实关注被审计对象应该履行的环保责任。 【Abstract】Ecologic civilization construction is crucial in the new era of China ’ s economic transformation from high¬speed development to high-quality development. The effect of pollution control is closely related to whether the economy can achieve sustainable and healthy development，and whether the high-speed development can be achieved to high-quality development stage. At the same time，the audit of budget fund expenditure and responsibility of ecological civilization construction for pollution prevention and control has gradually become the supervision object and key content of budget implementation audit and economic responsibility audit. Using the provincial - level local government data from 2012 to 2016， this paper examines the relationship during economic responsibility audit and local government governance from the perspective of the environmental governance. The results show that ：National audits have a governance function，the greater intensity of economic responsibility audits，the higher level of local government governance. Additionally，the effect of economic responsibility audits is more obvious in regions with lower levels of marketization and legalization. In terms of economic development quality，the positive role of economic responsibility audits in local government governance is mainly manifested in regions with high GDP growth rates and in regions with low GDP volumes. Further research finds that the more serious a region's environmental pollution problem，the greater investment in its economic responsibility audits ； in other words，national audits are able to identify and draw attention to the environmental responsibility fulfilled by the audited objects in audit practice.国家自然科学基金项目“政府财务信息披露、政府债务风险防范与审计监控机制研究”（71672119)；国家社会科学基金重大项目“中国特色社会主义国家审计理论研究——以公共受托经济责任和国家治理为视角的考察” (13&ZD146);重庆市社会科学规划项目“国家审计促进重庆市加快脱贫攻坚与乡村振兴衔接研究”(2019YBGL064);西南政法大学引进人才科研资助项目“经济高质量发展视阈下政府审计与脱贫攻坚研究”(2019-XZRCXM003

刻蚀工艺对四面体非晶碳膜生长及其性能的影响

目的研究不同等离子体刻蚀工艺对基体和四面体非晶碳膜(ta-C)的影响,并进一步考察不同电弧等离子体刻蚀时间对ta-C薄膜结构的影响。方法采用自主设计研制的45°单弯曲磁过滤阴极真空电弧镀膜设备,进行不同等离子体刻蚀以及ta-C薄膜的沉积。使用等离子体发射光谱仪表征离子种类及其密度,使用椭偏仪表征薄膜厚度,原子力显微镜表征刻蚀后的基体粗糙度,拉曼光谱仪和XPS表征薄膜结构,TEM分析薄膜的膜基界面结构。结果辉光刻蚀工艺中,作用的等离子体离子以低密度的Ar离子为主;而电弧刻蚀时,作用的等离子体离子为高密度的Ar离子和少量的C离子,并且能够在基体表面形成约15 nm的界面层,并实现非晶碳膜(a-C)的预沉积。随电弧等离子体刻蚀时间增加,ta-C薄膜的sp3含量有所降低。结论相比于辉光刻蚀,电弧刻蚀利于制备较厚的ta-C薄膜。这主要是因为电弧刻蚀时,基体表面形成良好的界面混合层,并预沉积了非晶碳膜,形成a-C/ta-C的梯度结构,有助于增强膜基结合力

水相反应介质对有机相微生物脱硫的影响

以十二烷为模拟油相，以革兰氏阴性菌德氏假单胞菌(Pseudomonas delafieldii)R-8作为有机相脱硫的微生物，对脱硫过程中水相反应介质的组成(生长介质和非生长介质)，pH，含盐(NaCl)浓度和水相体积等对R-8静止细胞脱硫活性的影响进行了研究．探讨了辅因子和不同烷烃对脱硫活性的影响．结果表明，R-8在NaCl浓度高达60g·L^-1，油相体积分数大于83％的条件下仍具有较高的脱硫活性．辅因子NADH的添加可有效提高菌株的脱硫速率。R-8可脱除C6～C16烷烃中的DBT，其中以在十二烷和十六烷中的活性最高，分别为1．96和1．70mg·g^-1·h^-1，同R.erythropolis IGTS8的脱硫活性相当

水相反应介质对有机相微生物脱硫的影响

以十二烷为模拟油相,以革兰氏阴性菌德氏假单胞菌(Pseudomonas delafieldii)R-8作为有机相脱硫的微生物,对脱硫过程中水相反应介质的组成(生长介质和非生长介质),pH,含盐(NaCl)浓度和水相体积等对R-8静止细胞脱硫活性的影响进行了研究.探讨了辅因子和不同烷烃对脱硫活性的影响.结果表明,R-8在NaCI浓度高达60g&middot;L-1,油相体积分数大于83％的条件下仍具有较高的脱硫活性.辅因子NADH的添加可有效提高菌株的脱硫速率.R.8可脱除C6~C16烷烃中的DBT,其中以在十二烷和十六烷中的活性最高,分别为1.96和1.70 mg&middot;g-1&middot;h-1,同R.erythropolis IGTS8的脱硫活性相当