نتایج جستجو برای: rapid zift

تعداد نتایج: 304009  

2013
Huanyin Chen

In 1995, Camillo and Yu showed that an exchange ring has stable range 1 if and only if every regular element is unit regular. An element m in a module RM is called regular if (mλ)m = m for some λ ∈ hom(M,R). In this paper we define stable modules and show that if M has the finite exchange property then M is stable if and only if, for every regular element m ∈ M, (mγ)m = m where γ : M → R is epi...

2008
Aaron Bergman Daniel Robbins Cynthia W. Mitchell

We consider compactifications of type II string theory in which a d-dimensional torus is fibered over a base X. In string theory, the transition functions of this fibration need not be simply diffeomorphisms of T d but can involve elements of the T-duality group Spin(d, d,Z). We precisely define the notion of a T-fold with NSNS flux. Given such a T-fold, we define the Z2-graded cohomology theor...

1994
Jeff Butterworth Andrew Davidson Stephen Hench Marc Olano Kenneth Herndon Robert Zeleznik Daniel Robbins Brookshire Conner Scott Snibbe Andries van Dam John K. Ousterhout Randy Pausch M. Anne Shackelford Dennis Proffitt Matthew Conway Chris Shaw Jiandog Liang Mark Green Guido van Rossum Robert C Zeleznik D. Brookshire Conner Matthias M. Wloka Daniel G. Aliaga Nathan T. Huang Philip M. Hubbard Brian Knep Henry Kaufman John F. Hughes

2009
Edgar E. Enochs Zhaoyong Huang

In terms of the duality property of injective preenvelopes and flat precovers, we get an equivalent characterization of left Noetherian rings. For a left and right Noetherian ring R, we prove that the flat dimension of the injective envelope of any (Gorenstein) flat left R-module is at most the flat dimension of the injective envelope of RR. Then we get that the injective envelope of RR is (Gor...

Journal: :IEEE Software 1995
V. Scott Gordon James M. Bieman

Rapid prototyping is a development method that may or may not be e ective in improving software products and process. Assessing the e ectiveness of rapid prototyping requires empirical data. We analyze 39 published and unpublished \real world" case studies of the use of rapid prototyping for developing software products. By identifying e ects mentioned in multiple sources, we are able to extrac...

Journal: :IJMR 2010
Xiu-Tian Yan Barry Stewart

Companies adopt the strategy of producing variety of products to be competitive and responsive to market. Product variation is becoming an important factor in companies’ ability to accurately meet customer requirements. Ever increasing consumer options mean that customers have more choices than ever before which put commercial pressures on companies to continue to diversify. This can be a parti...

پایان نامه :دانشگاه آزاد اسلامی - دانشگاه آزاد اسلامی واحد یزد - دانشکده شیمی 1392

in this study, a simple, rapid and selective method was developed for the determination of dexamethasone. the proposed method is based on inhibitory effect of dexamethasone on the oxidation of orange-g by bromate in sulfuric acid media. the reaction was followed spectrophotometrically at 478.5 nm (?max). under optimum experimental conditions, (72.6 ?mol l-1 of orange-g, 0.76 mol l-1 of h2so4, 0...

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