本研究合成了一系列具有N , N'-二芳基草酰胺酯和N , N'-二芳基二硫代草酰胺酯配体的Al催化剂,并测定了它们的ε-己内酯聚合速率。在带有N , N '-二芳基二硫代草酰胺酸酯的 Al 配合物中,[Ph H NCS] 2 Al 2 Me 4表现出最高的催化活性(聚ε-己内酯的转化率 = 94%;[ε-己内酯]:[ [ Ph H NCS] 2 Al 2 Me 4 ]:[苯甲醇] = 100:0.5:2,[ε-己内酯] = 2 M,在 25 °C 下 20 分钟后),以及带有 N , N '-二芳基二草酰胺酸酯的Al配合物,[Ph H NCO] 2 Al 2 Me 4表现出最高的催化活性(聚ε-己内酯的转化率 = 94%;[ε-己内酯]:[ O H Al 2 Me 4 ]:[苯甲醇] = 100: 0.5:2,[ε-己内酯] = 2 M,25 °C,30 分钟后)。带有N , N'-二芳
THE CRITIQUE OF ANGLICAN BIBLICAL SCHOLARSHIP IN GEORGE ELIOT'S MIDDLEMARCH
作者:L. Baltazar
DOI:10.1093/litthe/15.1.40
日期:2001.3.1
George Eliot early repudiated supernatural Christianity, but she continued to regard the Bible as an irreplaceable cultural repository and ethical source, enthusiastically embracing the new historical critical method, and viewing with repugnance the reactionary apologetics offered by Anglican scholars in support of the doctrine of biblical infallibilism. The extent of Eliot's interest in and knowledge of these matters has not, for the most part, been fully realised. Eliot was a biblical scholar in her own right, proficient in Greek, Latin and German, and well-versed in the intersecting disciplines of philology and mythography This expertise finds a fictional outlet in Middlemarch. The Reverend Edward Casaubon is engaged in researches the aim of which is to prove etymologically the priority and historical accuracy of Genesis as over against the legendary accounts of other ancient civilisations, a project which to a large extent controls the action of the novel. Eliot's relentless critique of his ‘Key to All Mythologies’ amounts to an extremely informed debunking of the infallibilist position
Non-toxic corrosion-protection pigments based on manganese
申请人:——
公开号:US20040011252A1
公开(公告)日:2004-01-22
Corrosion-inhibiting pigments based on manganese are described that contain a trivalent or tetravalent manganese/valence stabilizer complex. An inorganic or organic material is used to stabilize the trivalent or tetravalent manganese ion to form a compound that is sparingly soluble, exhibits low solubility, or is insoluble in water, depending upon the intended usage. Specific stabilizers are chosen to control the release rate of trivalent or tetravalent manganese during exposure to water and to tailor the compatibility of the powder when used as a pigment in a chosen binder system. Stabilizers may also modify the processing and handling characteristics of the formed powders. Manganese/valence stabilizer combinations are chosen based on the well-founded principles of manganese coordination chemistry. Many manganese-valence stabilizer combinations are presented that can equal the performance of conventional hexavalent chromium or tetravalent lead systems. It is emphasized that this abstract is provided to comply with the rules requiring an abstract which will allow a searcher or other reader to quickly ascertain the subject matter of the technical disclosure. It is submitted with the understanding that it will not be used to interpret or limit the scope or meaning of the claims.
Non-toxic corrosion-protection pigments based on rare earth elements
申请人:——
公开号:US20040104377A1
公开(公告)日:2004-06-03
A corrosion-inhibiting pigment comprising a rare earth element and a valence stabilizer combinded to form a rare earth/valence stabilizer complex. The rare earth element is selected from cerium, terbium, praseodymium, or a combination thereof, and at least one rare earth element is in the tetravalent oxidation state. An inorganic or organic material is used to stabilize the tetravalent rare earth ion to form a compound that is sparingly soluble in water. Specific stabilizers are chosen to control the release rate of tetravalent cerium, terbium, or praseodymium during exposure to water and to tailor the compatibility of the powder when used as a pigment in a chosen binder system. Stabilizers may also modify the processing and handling characteristics of the formed powders. Many rare earth-valence stabilizer combinations are presented that can equal the performance of conventional hexavalent chromium systems.