115,729 research outputs found
Urban heat island research in Phoenix, Arizona: Theoretical contributions and policy applications
No full textabstract: This review investigates the possible reasons and motivations underpinning the large body of work, as well as summarizing specific themes, approaches, and theoretical contributions arising from such study.Corresponding Author:
Winston T. L. Chow
Arizona State University
[email protected]
Chow Theorem and structure of Carnot-Caratheodory balls
Get PDFopenThis thesis is meant to be a study on the role of the C-C metrics in the Chow theorem and on the structure of C-C balls.
It opens with a section in which we give the definitions of vector field and bracket and we state the properties of the latter.
Then we give the definition of the most important object of this work: the Carnot-Caratheodory metrics and we state some basic propositions on its behavior, hinting also to some metrics which are equivalent to it.
We now proceed giving preliminary notions about exponential maps on a compact set of R^n, we state the Campbell-Hausdorff formula for two smooth vector fields and we introduce an object defined as a composition of exponentials E(J,t).
We finally state the Chow theorem for m smooth vector fields in R^n satisfying the Chow-Hoermander condition. We prove it using the Campbell-Hausdorff formula and defining through E(J,t) n approximated exponential maps whose composition provides us with a local diffeomorphism.
This theorem is particularly important because it tells us that under Chow-Hoermander condition we can regain directions that would be otherwise prohibited.
We introduce the doubling metric spaces and in particular we state a theorem on the structure of C-C balls: the Nagel-Stein-Wainger theorem, which provides us with the size of the C-C balls and tells us they are represented as the image of rectangles under the exponential map.
At last, we close this work with a variant of the structure theorem.This thesis is meant to be a study on the role of the C-C metrics in the Chow theorem and on the structure of C-C balls.
It opens with a section in which we give the definitions of vector field and bracket and we state the properties of the latter.
Then we give the definition of the most important object of this work: the Carnot-Caratheodory metrics and we state some basic propositions on its behavior, hinting also to some metrics which are equivalent to it.
We now proceed giving preliminary notions about exponential maps on a compact set of R^n, we state the Campbell-Hausdorff formula for two smooth vector fields and we introduce an object defined as a composition of exponentials E(J,t).
We finally state the Chow theorem for m smooth vector fields in R^n satisfying the Chow-Hoermander condition. We prove it using the Campbell-Hausdorff formula and defining through E(J,t) n approximated exponential maps whose composition provides us with a local diffeomorphism.
This theorem is particularly important because it tells us that under Chow-Hoermander condition we can regain directions that would be otherwise prohibited.
We introduce the doubling metric spaces and in particular we state a theorem on the structure of C-C balls: the Nagel-Stein-Wainger theorem, which provides us with the size of the C-C balls and tells us they are represented as the image of rectangles under the exponential map.
At last, we close this work with a variant of the structure theorem
SPATIAL CHOW-LIN METHODS: BAYESIAN AND ML FORECAST COMPARISONS
Get PDFCompleting data that are collected in disaggregated and heterogeneous spatial units is a quite frequent problem in spatial analyses of regional data. Chow and Lin (1971) (CL) were the rst to develop a uni ed framework for the three problems (interpolation, extrapolation and distribution) of predicting disaggregated times series by so-called indicator series. This paper develops a spatial CL procedure for disaggregating cross-sectional spatial data and compares the Maximum Likelihood and Bayesian spatial CL forecasts with the naive pro rata error distribution. We outline the error covariance structure in a spatial context, derive the BLUE for the ML estimator and the Bayesian estimation procedure by MCMC. Finally we
apply the procedure to European regional GDP data and discuss the disaggregation assumptions. For the evaluation of the spatial Chow-Lin procedure we assume that only NUTS 1 GDP is known and predict it at NUTS 2 by using employment and spatial information available at NUTS 2. The spatial neighborhood is de ned by the inverse travel time by car in minutes. Finally, we present the forecast accuracy criteria comparing the predicted values with the actual observations.
Lo Jee-Ou's memorandum to Chambers Chow and H-T Yang on June 15, 1946, Hankow (Hankou) [China]
No full textA memorandum from Lo Jee-Ou to Chambers Chow and H-T Yang on June 15, 1946, regarding urgent problems with relief work. Three identical copies of this memorandum are included.Action – Applications for Relie
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Lannes's T-functor, equivariant Chow rings, and motivic homology
Get PDFThis dissertation takes place in three parts, all themed around motivic cohomology and Voevodsky's derived category of motives. In Chapter 1, we use Lannes's T-functor to study equivariant Chow rings. In Chapter 2, we explicitly compute certain equivariant Chow rings, namely Chow rings of classifying spaces of finite groups of order 32. In Chapter 3, we prove that isomorphisms in Voevodsky's derived category of motives are detected by a certain family of motivic homology group
Misja salezjańska Chiu Chow w Chinach
Get PDFThis article tells the story of Shiu Chow\u27s Salesian Mission in China (1918–1951), became Apostolic Vicariate (1920) and then diocese (1948). The Mission had lived a enormous development under the three Salesian bishops: Msgr. Versiglia (1918–1930), first Vicar Apostolic and Salesian protomartyr, Monk. Canazei (1930–1946), the Inspector in China and then Vicar Apostolic of Shiu Chow, Msgr. Arduino (1948–1951), director of the Salesian schools in Shanghai and first bishop of the diocese of Shiu Chow. Thriving mission activity and development closes the expulsion of the Salesian missionaries, the FMA nuns and Msgr. Arduino (December 2, 1951) from China from the Communists. The last part is dedicated to the Polish Salesian missionaries working in Shiu Chow Mission: coad. J. Urban, Ps. W. Spinek, sac. T. Szeliga, priest W. Wieczorek. The material for the article I found in the books of don. M. Rassiga, missionary and chronicler of Shiu Chow mission, I kindly offers to the author himself.Ten artykuł opowiada historię misji salezjańskiej Shiu Chow w Chinach (1918–1951), został wikariatem apostolskim (1920), a następnie diecezją (1948). Misja żyła a ogromny rozwój pod rządami trzech biskupów salezjańskich: ks. Versiglia (1918-1930), pierwszy wikariusz Pierwszy męczennik apostolski i salezjański, ks. Canazei (1930–1946), inspektor w Chinach, a następnie wikariusz Apostolski Shiu Chow, ks. Arduino (1948-1951), dyrektor szkół salezjańskich w Szanghaju i pierwszy biskup diecezji Shiu Chow. Prężnie rozwijająca się działalność i rozwój misji dobiegają końca wypędzenie salezjanów misjonarzy, sióstr CMW i ks. Arduino (2 grudnia 1951) od Chiny od komunistów. Ostatnia część poświęcona jest polskim misjonarzom salezjańskim pracującym w Polsce Misja Shiu Chow: dowódca. J. Urban, Ps. W. Spinek, sac. T. Szeligi, ks W. Wieczorek. The materiał do artykułu znalazłem w księgach dona. M. Rassiga, misjonarz i kronikarz Misję Shiu Chow, uprzejmie ofiarowuję samemu autorowi
Chow groups and pseudoffective cones of complexity-one T-varieties
No full textAbstract We show that the pseudoeffective cone of k -cycles on a complete complexity-one T -variety is rational polyhedral for any k , generated by classes of T -invariant subvarieties. When X is also rational, we give a presentation of the Chow groups of X in terms of generators and relations, coming from the combinatorial data defining X as a T -variety
Vulnerability to Extreme Heat in Metropolitan Phoenix: Spatial, Temporal, and Demographic Dimensions
Get PDF10.1080/00330124.2011.600225Professional Geographer642286-30
COMPUTATIONAL EXPERIENCE WITH THE CHOW-YORKE
Get PDFThe Chow-Yorke algorithm is a nonsimplicial homotopy-type method for computing Brouwer fixed points that is globally convergent. It is efficient and accurate for fixed point problems. L. T. Watson, T. Y. Li, and C. Y. Wang have adapted the method for zero finding problems, the nonlinear complementarity problem, and nonlinear two-point boundary value problems. Here theoretical justification is given for applying the method to some mathematical programming problems, and computational results are presented
Computational Experience with the Chow-yorke
No full textThe Chow-Yorke algorithm is a nonsimplicial homotopy-type method for computing Brouwer fixed points that is globally convergent. It is efficient and accurate for fixed point problems. L. T. Watson, T. Y. Li, and C. Y. Wang have adapted the method for zero finding problems, the nonlinear complementarity problem, and nonlinear two-point boundary value problems. Here theoretical justification is given for applying the method to some mathematical programming problems, and computational results are presented
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