Faraday Glasses with a Large Size and High Performance

A kind of Faraday glass with a size of 40 mm x 14 mm and 100-300 mm x 25 mm, respectively, was prepared by the melting and casting process, which had neither a Pt particulate nor a bubble or striation. The measurement results showed that the surface homogeneity of the samples was up to +/- 1 x 10-6, the laser threshold reached 10 J/cm2 (1 omega, 3 ns), and the Verdet constants of the glasses were -0.273 min/Oe/cm at 632.8 nm and -0.076 min/Oe/cm at 1064 nm, respectively.

Efficient synthesis of α-alkylidene-β-lactams via NaOH-promoted intramolecular aza-Michael addition of α-carbamoyl ketene-S,S-acetals in aqueous media

A facile and efficient synthesis of substituted alpha-alkylidene-beta-lactams have been developed via a NaOH-promoted intramolecular aza-Michael addition of alpha-carbamoyl, alpha-(1-chlorovinyl) ketene-S,S-acetals and subsequent nucleophilic vinylic substitution (SNV) reaction in alcoholic aqueous media. (C) 2008 Elsevier Ltd. All rights reserved.

Highly efficient and recoverable dendritic organocatalyst from click chemistry for the asymmetric michael addition of ketones to nitroolefins without the use of organic solvent

A series Of pyrrolidine-triazole based dendritic catalysts have been synthesized and applied directly in the asymmetric Michael addition of ketones to nitroolefins without the use of an organic solvent. Good yields (up to 99%), and high diastereoselectivities (up to syn/anti = 45:1) and enantioselectivities (up to 95% ee) have been obtained. Furthermore. the third generation catalyst can be reused at least five times without significant loss of catalytic activity. (C) 2008 Elsevier Ltd. All rights reserved.

Asymmetric Michael addition of aldehydes to nitroolefins catalyzed by L-prolinamide derivatives using phenols as co-catalysts

The asymmetric Michael addition of aldehydes to nitroolefins was investigated using L-prolinamide derivatives of 2-(2'-piperidinyl)pyridine as catalyst and a variety of phenols as co-catalyst. Extensive screening toward the effect of prolinamides, phenols, and solvents on this transformation revealed that a combination of (S)-2-(2'-piperidinyl)pyridine-derived trans-4-hydroxy-L-prolinamide 2c, (S)-1,1'-bi-2-naphthol, and dichloromethane was a promising system. This system was shown to be amenable to a rich variety of aldehydes and nitroolefins and afforded the nitroaldehyde products with excellent yield, enantiomeric excess (up to 99%) and diastereoselectivity ratio (up to 99/1), even in the case of 1 mol % catalyst loading and 1.5 equiv of aldehydes.

Facile synthesis and characterization of hyperbranched poly(ether amide)s generated from Michael addition polymerization of in situ created AB(2) monomers

A new straightforward strategy for synthesis of novel hyperbranched poly (ether amide)s from readily available monomers has been developed. By optimizing the reaction conditions, the AB(2)-type monomers were formed dominantly during the initial reaction stage. Without any purification, the AB(2) intermediate was subjected to further polymerization in the presence (or absence) of an initiator, to prepare the hyperbranched polymer-bearing multihydroxyl end-groups. The influence of monomer, initiator, and solvent on polymerization and the molecular weight (MW) of the resultant polymers was studied thoroughly. The MALDI-TOF MS of the polymers indicated that the polymerization proceeded in the proposed way. Analyses of H-1 NMR and C-13 NMR spectra revealed the branched structures of the polymers obtained. These polymers exhibit high-moderate MWs and broad MW distributions determined by gel permeation chromatography (GPC) in combination with triple detectors, including refractive index, light scattering, and viscosity detectors. In addition, the examination of the solution behavior of these polymers showed that the values of intrinsic viscosity [eta] and the Mark-Houwink exponent a were remarkably lower compared with their linear analogs, because of their branched nature.

Thia-michael addition reactions in water using 3-[Bis(alkylthio) methylene]pentane-2,4-diones as odorless and efficient thiol equivalents

3-[Bis(ethylthio)methylene]pentane-2,4-dione (1a) and 3-[bis(benzylthio)methylene]pentane-2,4-dione (1b) have been investigated as non-thiolic and odorless thiol equivalents in thia-Michael addition reactions. In the presence of aqueous p-dodecyl benzenesulfonic acid (DBSA), compound (1) was cleaved and the generated thiols underwent facile conjugate addition to alpha,beta-unsaturated ketones 2 in-situ, affording the corresponding beta-keto sulfides (3) in good yields.

含分子内氢键的苯硫酚在水相中的Michael加成反应

苯硫酚的巯基是一个较强的亲核基团 [1] ,对 α,β-不饱和双键的 Michael加成反应已有报道 [2～ 4 ] .但是当巯基的邻位存在与其形成氢键的基团时 ,如果按文献条件进行反应 ,或者反应无法进行 [5,6 ] ,或者要使用反应条件苛刻的丁基锂 [6 ] ,或者使用吡啶等毒性较大的反应溶剂 [2～ 9] ,而且产率较低 .本文选择了饱和碳酸氢钠水溶液 /n-四丁基硫酸氢铵的反应条件 ,探讨了该类化合物在此条件下的 Michael加成反应 .以 3个含分子内氢键的苯硫酚 (邻羟基苯硫酚、邻氨基苯硫酚和邻羧基苯硫酚 )为起始物 ,对丙烯酸乙酯和丙烯腈进行了 Michael加成反应 .本方法的特点在于不使用特殊的有机溶剂 ,反应在水相[10～ 12 ] 中进行 ;反应速度快 ,收率高 ,无巯基偶联 [13] 副产物生成 .反应式如 Scheme1所示 .RSH1 a— 1 c+ OONa HCO3,H2 On-Bu4 N HSO4RSOO2 a— 2 cRSH1 a— 1 c+ NC Na HCO3,H2 On-Bu4 N HSO4RSCN3 a— 3 ca. R =OH;b. R =N H2 ;c. R...

Competitiveness in a globalised world: Michael Porter on the microeconomic foundations of the competitiveness of nations, regions, and firms.

In this paper, we provide the text of an interview with Professor Michael Porter discussing his research and ideas relating to the microeconomic foundations of global competitiveness. The discussion provides a microeconomic perspective on some of the key issues relating to recent research on competitiveness, productivity, clusters, US economic leadership, economic growth and development.

Competitive advantage revisited: Michael Porter on strategy and competitiveness.

Strategic management is constantly evolving as both an academic discipline and as a reflection of management practice. This article, based on a recent interview with Michael Porter, assesses his contribution to the development of the discipline in the context of the advances that have taken place since the publication of his seminal work Competitive Strategy in 1980. The authors conclude that Porter has made major lasting contributions to strategy, increasing both its academic rigor and its accessibility to managers. The article and interview place Porter's work at the center of the development of strategic management in terms of the provision of practical analytical frameworks, transforming it into a recognized and recognizable field of academic study and management practice. This feat of transformation has not been equaled before or since, so that 25 years after his first seminal contribution, Porter's work continues to provide remarkable insights into the nature of competition and strategy.

Qualifying Cosmopolitanism? Solidarity, Criticism, and Michael Walzer's 'View from the Cave'

Erskine, Toni, 'Qualifying Cosmopolitanism? Solidarity, Criticism, and Michael Walzer's 'View from the Cave'', International Politics (2007) 44(1) pp.125-149 RAE2008

Robert Heinich, Michael Molenda, James D. Russell, Sharon E. Smaldino, Instructional Media and Technologies for Learning, Prentice-Hall, Inc., Englewood Cliffs, New Jersey 1996, ss. 446. Steven Hackbarth, The Educational Technology Handbook. A Comprehensive Guide, Educational Technology Publications Inc., Englewood Cliffs, New Jersey 1996, ss. 351

Recenzje i sprawozdania z książek

Missionary heroes : stories of heroism on the mission field / edited by Charles D. Michael.

http://www.archive.org/details/missionaryheroes00unknuoft

Michael Rostovtzeff. Per la storia del colonato romano

info:eu-repo/semantics/published

Family, community and politics: the fertile legacy of Michael Young

The Institute of Community Studies was set up by Michael Young in order to carry out research on politically relevant social issues, in a context free from direct political control. A research method was devised for it whereby researchers made their own values and objectives very explicit, while staying as close as possible in their reports to the concerns and language of respondents themselves. This method has often been criticized by professional sociologists: but it reflects quite well the nature of social knowledge. It has produced reports which help to increase public understanding of social processes, and provide useful guidance to policy makers. Professional sociology on the other hand has tried to develop a rigorously value-free method. As a result, though, it often seems to be tied implicitly to values shared among researchers but not more universally. Arguably this makes it harder for the general public to understand, and accept, its findings.