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21.
Given any metric space, we construct its uniformly locally pathwise connected coreflection in the category of all metric spaces
and uniformly continuous maps.
相似文献
22.
The quadrupole interaction (QI) in hexagonal close packed zinc lattice was measured using the 482 keV, 10.6 ns probe state of181Ta employing the time-differential perturbed angular correlation technique. The electric field gradient (EFG) at181Ta in Zn was derived from the measured quadrupole interaction frequency at room temperature asV
zz
=12.202×1017 V/cm2. The quadrupole interaction measured at various temperatures displayed normal temperature dependence similar to that seen by this probe in many non-cubic hosts. 相似文献
23.
P. N. Tandon V. S. Patil A. K. Grover R. G. Pillay H. G. Devare 《Hyperfine Interactions》1983,16(1-4):709-712
A new class of magnetic system RuxFeySi, has been identified in which the hyperfine field at Fe, as sensed by57Fe Mossbauer effect, is seen to evolve at a characteristic temperature far below the bulk magnetic ordering temperatures. 相似文献
24.
Quadrupole interactions at111Cd in various rare-earth intermetallics have been investigated. The enhancement in the efg due to the electronic configurations is found to be small in contrast to pure metals.The authors thank K. Raghunathan for helpful discussions. 相似文献
25.
Anand Pillay 《Annals of Pure and Applied Logic》1980,43(2):147-160
We prove that if T is a stable theory with only a finite number (>1) of countable models, then T contains a type-definable pseudoplane. We also show that for any stable theory T either T contains a type-definable pseudoplane or T is weakly normal (in the sense of [9]). 相似文献
26.
V.S. Patil R.G. Pillay A.K. Grover P.N. Tandon H.G. Devare 《Solid State Communications》1983,48(11):945-947
A ternary system consisting of Ru, Fe and Si is identified in which the hyperfine field at Fe is seen to evolve at a characteristic temperature, T1, far below the magnetic ordering temperature, Tm. It is speculated that the magnetic ordering at Tm is itinerant and T1 corresponds to the localization of the majority spin electrons at the Fe atoms. 相似文献
27.
We prove that if is an algebraic -group (in the sense of Buium over a differentially closed field of characteristic , then the first order structure consisting of together with the algebraic -subvarieties of , has quantifier-elimination. In other words, the projection on of a -constructible subset of is -constructible. Among the consequences is that any finite-dimensional differential algebraic group is interpretable in an algebraically closed field.
28.
Piotr Kowalski Anand Pillay 《Transactions of the American Mathematical Society》2007,359(3):1325-1337
We introduce the categories of algebraic -varieties and -groups over a difference field . Under a ``linearly -closed" assumption on we prove an isotriviality theorem for -groups. This theorem immediately yields the key lemma in a proof of the Manin-Mumford conjecture. The present paper crucially uses ideas of Pilay and Ziegler (2003) but in a model theory free manner. The applications to Manin-Mumford are inspired by Hrushovski's work (2001) and are also closely related to papers of Pink and Roessler (2002 and 2004).
29.
A. Pillay Narrainen L. R. Hutchings W. J. Feast R. L. Thompson I. A. Ansari N. Clarke 《Macromolecular Symposia》2005,231(1):103-109
Fréchet-type poly(arylether) first and second generation (G1 and G2 respectively) dendrons were prepared from 1-(bromomethyl)-3,5-bis(trifluoromethyl)benzene. The latter and the brominated versions of the two dendrons were successfully employed in the copper mediated living radical polymerization (LRP) of styrene-d8 giving polymers of predictable molecular weights and narrow polydispersities. Contact angle measurements and ion beam analysis were used to explore the adsorption of these materials to the air-polymer surface in blended films with unfunctionalized hydrogenous polystyrene. Although contact angle analysis indicated only modest changes in the hydrophobicity and lipophobicity of the surface, ion beam analysis clearly showed the formation of an excess layer of dendron functionalized polymer at the exposed surface that increased with increasing fluorine content. 相似文献
30.
The kinetics of the reaction of ethyl α‐halogenoacetate with benzoic acid in the presence of triethylamine in aqueous acetone and in various solvents have been investigated. The rate constant of the reaction is 4–260 times higher in aprotic dipolar solvents than in protic solvents. The simple regression and multiple regression of log k2 with various solvent parameters have led to the conclusion that in addition to the solvent polarity, various other solvent properties, together or individually, influence the reaction rate. © 1999 John Wiley & Sons, Inc. Int J Chem Kinet 31: 894–900, 1999 相似文献