地方政府竞争、重复建设及其规制政策分析

分权体制下地方政府竞争引发的重复建设和产业同构问题影响了区域经济的协调发展。本文构建了地方政府投资博弈的重复建设模型,并在此基础上探讨使地方政府行为从产业竞争转向合作的激励机制和制度安排。研究发现:在中国垂直的政治管理体制下,中央政府实施对高利润行业征税或者对低利润行业补贴或者两者并举的政策,可以降低重复建设率,且两者并举的双重激励制度效果最优。这些制度安排在保持地方政府发展经济积极性的同时,约束地方政府竞争行为,有利于区域产业体系的完善和区域经济的和谐发展。     

利用密度反馈实现离子源长脉冲放电

介绍了等离子体密度对离子源放电的影响,为了获得长脉冲放电,采用朗缪尔探针测量等离子体密度并反馈调节离子源放电。基于朗缪尔探针测量,设计了控制部分硬件与软件构架,建立了离子源等离子体密度反馈控制系统,并成功地应用于离子源等离子体放电实验,通过反馈调节实验进气,得到了长达4.5 s的长脉冲放电,为中性束注入稳态运行提供了依据。     

1, 1'-联二萘酚的拆分研究进展

概括了近年来1,1'-联二萘酚类化合物等具有C~2轴不对称联芳香族化合物的拆分研究进展。     

A Simple Method for Controlling the Degree of PEGylation of Dynorphin A (1-13)

Dynorphin A (1–13) was chemically modified by reaction with succinimidyl propionate‐monomethoxy polyethylene glycol (mPEG‐SPA). To determine the degree and the optimized condition for PEGylation of dynorphin A, the reactions were monitored in different pH buffers at different molar ratios by reversed‐phase high performance liquid chromatography (RP‐HPLC) and matrix‐assisted laser desorption/ionization time‐of‐?ight mass spectrometry (MALDI‐TOF MS). The results showed that the degree of PEGylation for dynorphin A could easily be controlled through adjustment of the molar ratios and the pH. The degree of PEGylation of dynorphin A increased as the molar ratio of dynorphin to MPEG‐SPA and the pH increased.     

Fe1/2Al1/2PO4催化1,2-二氯丙烷脱氯氧化制备环氧丙烷

Fe1/2Al1/2PO4催化1;2-二氯丙烷脱氯氧化制备环氧丙烷     

Comparison of Mechanisms of N-Nitrosation and N-Nitration of Ammonia and Dimethylamine by Reactive Nitrogen Oxygen Species: A Theoretical Study

Reactive nitrogen oxygen species(RNOS) implicate damage in biological systems,especially leading to inflammation,neurodegenerative and cardiovascular diseases,and cancer by altering the functions of biomolecules through the N-nitrosation and N-nitration reactions.The mechanisms of N-nitrosation and N-nitration reactions of ammonia and dimethylamine by RNOS,i.e.,N2O3,N2O4,N2O5 and ONOOH,were investigated at the CBS-QB3 level of theory.The computational results indicate that the N-nitrosation reaction prefers a concerted mechanism,in which a H-abstraction and ON-addition occur simultaneously,whereas a stepwise mechanism(also called a free radical mechanism) is more favorable for most nitrating agents in the N-nitration reaction,where NO2 first abstracts a hydrogen atom from the nitrogen of amines and then the induced intermediate reacts with NO2 once more to form the nitration products.However,the concerted pathway is still a feasible process for some nitrating agents such as N2O5.In addition,the relationship between the structures of different RNOS and their nitrosating or nitrating abilities was also investigated.     

超声协同TiO_2光催化脱除燃料油中有机硫的研究

采用溶胶凝胶法制备纳米TiO2光催化剂,引入超声作用,以空气中的氧气为氧化剂,正辛烷为模拟油品对燃料油中硫化物的脱除进行了研究。考察了光照强度、催化剂用量、反应时间、二苯并噻吩(DBT)初始浓度、超声功率等因素对TiO2光催化二苯并噻吩溶液降解效率的影响。结果表明,引入超声后DBT的降解率提高了10%左右,并在TiO2用量为2 g/L,通气量为800 mL/min,光照距离20 cm,DBT初始浓度为600 mg/L,反应时间为150 min,超声功率为500 W的条件下,DBT降解率达到了72.6%。     

杂多酸催化研究新进展

杂多酸催化剂泛指杂多酸及其盐 ,是一类由中心原子 (即杂原子 ,如 P、 Si等 )和配位原子 (即多原子 ,如 Mo、 W等 )通过氧原子桥联方式进行空间组合的多氧簇金属配合物 (polyoxometalate) ,作为催化材料广泛应用于均相与多相催化反应体系 .近年来 ,杂多酸在催化领域中受到越来越多关注 ,主要原因是 :1 .随着石油化工与精细化工的发展 ,催化材料的多功能性成为研究的新目标 .杂多酸是一种酸碱性与氧化还原性兼具的双功能型催化剂 ,对于新催化过程的研究具有重要意义 ;2 .随着分子“剪裁”技术的迅速兴起 ,新型催化材料层出不穷 .杂多酸的阴…     

Spectrofluorimetric determination of hydrogen peroxide based on the catalytic effect of peroxidase-like manganese tetrakis(sulphophenyl) porphyrin on the oxidation of homovanillic acid

Traces of hydrogen peroxide (8.5 × 10^?8–2.5 × 10^?6 mol/l) and, indirectly, glucose (3–44 × 10^?6 mol/l) can be determined by the fluorescence reaction between homovanillic acid and hydrogen peroxide. Mn-TPPS₄ is found to have very similar catalytic properties to horse peroxidase.     

十二烷基磺酸钠微乳状液结构转变的电化学研究

制备了C12H25SO3Na-C4H9OH-C7H16-H2O四组分体系在km=W(C4H9OH)/W(C12H25SO3Na)=2时的拟三元相图。使用二茂铁和铁氰化钾作为电化学探针用循环伏安法测定了起始含油量为21％的无水混合物在滴加水过程中所形成的微太液的扩散系数。从扩散系数随含水量的变化确定微乳液的结构转变。含水量为20％－45％时生成油包水型微液;含水量大于65％时生成水包油型微乳液。当含水量在45％－65％之间时形成的是二连续型微乳液。电导率数据证实了循环伏安法的测定结果。