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Chão de estrelas: hotelaria e produção imobiliária em São Paulo, 1995-2005; Floor of stars: hotels and real estate in the city of Sao Paulo, 1995-2005.

Spolon, Ana Paula Garcia
Fonte: Biblioteca Digitais de Teses e Dissertações da USP Publicador: Biblioteca Digitais de Teses e Dissertações da USP
Tipo: Dissertação de Mestrado Formato: application/pdf
Publicado em 03/08/2006 PT
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A indústria hoteleira paulistana experimentou, no período compreendido entre os anos de 1995 e 2005, a maior expansão quantitativa de sua história. Tida como exagerada por muitos especialistas e profissionais do setor, esta expansão teria provocado uma crise generalizada, propalada por investidores, redes administradoras de hotéis e incorporadores, despertando dúvidas sobre a real necessidade de ampliação da rede hoteleira instalada no início da década de 1990, no município de São Paulo. Nesta dissertação, considera-se a hipótese de que esta expansão não tenha sido orientada com base na demanda por novas unidades hoteleiras, mas pela identificação de demanda por novos espaços urbanos. A decisão de se promover a construção de novos hotéis seria, portanto, justificada por interesses mais amplos e complexos. O entendimento desses interesses mostra-se fundamental, portanto, para que se possa compreender a natureza da relação entre a hotelaria e a indústria imobiliária. A análise desta problemática fez-se a partir da investigação da maneira como aconteceu o desenvolvimento da hotelaria paulistana no que diz respeito ao formato do negócio, à natureza administrativa, à estética dos projetos, ao papel de cada um dos agentes envolvidos na tarefa de implantação de novos hotéis e ao movimento de espalhamento dos estabelecimentos hoteleiros no espaço urbano do município de São Paulo. Os resultados desta análise mostram que este crescimento recente do parque hoteleiro paulistano só foi possível graças à constituição de um grupo de agentes sociais em torno de um interesse comum: a produção de novos espaços urbanos...

Uma estimativa do modelo DSGE para o Brasil com rigidez real e nominal

Niquito, Thais Waideman
Fonte: Universidade Federal do Rio Grande do Sul Publicador: Universidade Federal do Rio Grande do Sul
Tipo: Dissertação Formato: application/pdf
POR
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Conforme enfatizado por Dib (2003), recentemente tem sido observado um crescente interesse no desenvolvimento de modelos econômicos que destacam o papel da rigidez no preço nominal, pautados no comportamento otimizador de agentes racionais em um ambiente dinâmico, estocástico e de equilíbrio geral (DSGE). Entretanto, apesar das vantagens apresentadas por esta classe de modelos, observa-se que os choques de política monetária geram apenas fraca persistência nas variáveis reais e nominais, o que vai de encontro com a maior parte das evidências, que indicam que os efeitos destes choques duram vários trimestres. Desta forma, no presente trabalho foi feita, através de métodos bayesianos, a estimação para o Brasil do modelo DSGE desenvolvido por Dib (2003), que combina rigidez nominal na forma de custos de ajustamento de preços e rigidez real na forma de custos de ajustamento de capital e/ou emprego. O objetivo foi verificar se a inserção de rigidez real aumenta a rigidez nominal e, consequentemente, a persistência de choques de política monetária. Os resultados de estimação mostraram que a inserção de rigidez real contribuiu para o aumento da rigidez nominal, em especial quando aquela foi inserida na forma de custos de ajustamento de emprego. Ainda...

A ficção científica e o ensino de ciências: o imaginário como formador do real e do racional

Gomes-Maluf, Marcilene Cristina; Souza, Aguinaldo Robinson de
Fonte: Universidade Estadual Paulista (UNESP), Faculdade de Ciências Publicador: Universidade Estadual Paulista (UNESP), Faculdade de Ciências
Tipo: Artigo de Revista Científica Formato: 271-282
POR
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Este artigo apresenta uma reflexão sobre a inserção da ficção científica no ensino de Ciências, no qual buscamos identificar como a ficção científica incorpora elementos na estrutura conceitual dos educandos partindo do pressuposto de que teria um papel de desencadeadora e/ou organizadora da aprendizagem. O filme Jurassic Park foi estudado como constitutivo do conhecimento, transmutando o ficcional no real/racional, possibilitando a organização hierárquica dos conceitos, acrescendo novos elementos na estrutura conceitual dos educandos e atuando, também, na mediação do conhecimento - ora organizando, ora desencadeando.; In this paper, we discuss the development of the science fiction approach in Science education. We are concerned to identify conceptual elements incorporated by students when faced with the science fiction approach in their development of scientific concepts. We use the movie Jurassic Park in this approach and found that the movie can be effective in the mediation of the fictional to the real.

Complex rational orthogonal wavelet and its application in communications

Yu, L.; White, L.
Fonte: IEEE-Inst Electrical Electronics Engineers Inc Publicador: IEEE-Inst Electrical Electronics Engineers Inc
Tipo: Artigo de Revista Científica
Publicado em //2006 EN
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This letter proposes a generalized method to construct complex wavelets under the framework of rational multiresolution analysis, MRA(M), where is a rational number. Theorems and examples are given for the construction of complex rational orthogonal wavelets (CROWs) whose real and imaginary parts form an exact Hilbert transform pair. Since the classical Mallat’s MRA is a special case of the rational MRA(M) with = 2, the theorems hold for the construction of complex dyadic wavelets. Based on a rational MRA(M) with 1 < M < 2, the constructed CROWs not only achieve the benefit by capturing the phase information that the real-valued wavelets are lacking but also have the unique fine rational orthogonal property that is suited for specific application scenarios where binary orthogonality achieved by dyadic wavelets is not sufficient for the scale resolution. The CROWs’ application in communications as the modulation signal pulse for PSK/QAM signaling is discussed. Specific communication scenarios that could benefit from the properties of this class of complex wavelets include the communication through a multipath/Doppler channel and new CROW-based multicarrier modulation (MCM)/orthogonal frequency division multiplexing (OFDM) systems.; Limin Yu and Langford B. White; Copyright © 2006 IEEE

Policy formulation processes in Malaysia and Australia: cultural differences do matter

Ansori, Siaan
Fonte: Universidade Nacional da Austrália Publicador: Universidade Nacional da Austrália
Tipo: Thesis (PhD); Doctor of Philosophy (PhD)
EN_AU
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This thesis examines the influence of culture in the national policy formulation processes of Malaysia and Australia. Superficially, these two countries have common stated strategic policy priorities (economic development and social stability), similar Westminster-based architectures of government, and comparable civil services. However, under the influence of culture and history, the two countries‘ policy formulation processes have developed very differently. In seeking explanations for the similarities and differences in government processes, the thesis demonstrates how cultural and historical experiences influence the policy formulation processes themselves, the associated policy outputs and outcomes, and ultimately the governments‘ ability to achieve their stated strategic policy priorities. It uses a case study of bilateral trade policy formulation to illuminate its findings in a real‘ national policy formulation context. Some specific examples of cultural and historical experiences shaping the policy formulation processes in Malaysia include: a legacy of pre-colonial (kerajaan) polities which existed in the Malayo-Indonesian archipelago up until the nineteenth century; colonisation by the British; and an omnipresent ethnic ideology‘ resulting from continuing fear of social unrest (experienced dramatically during the racial riots of 1969). In Australia...

Um estudo sobre construções dos Números Reais; A study on construction of the Real Numbers

Queiroz, Fabiana Moura de
Fonte: Universidade Federal de Goiás; Brasil; UFG; Programa de Pós-graduação em Matemática (IME); Instituto de Matemática e Estatística - IME (RG) Publicador: Universidade Federal de Goiás; Brasil; UFG; Programa de Pós-graduação em Matemática (IME); Instituto de Matemática e Estatística - IME (RG)
Tipo: Dissertação Formato: application/pdf
POR
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The main objective of this paper is to present the subtle passage of rational numbers to the real numbers, using a construction via Dedekind cuts and other by Cauchy sequences .We present a construction of rational numbers by equivalence classes, so that the reader has a foundation that serves as a support for a good understanding of proposed constructions of real numbers . We use the axiomatic method for buildings that are made on real numbers, in order to show the existence of an orderly and complete field and characterize it. It is also discussed, and a more synthesized form, the real numbers and its application to elementary and high school students.; O objetivo central deste trabalho é apresentar a sutil passagem dos números racionais aos números reais, utilizando uma construção via Cortes de Dedekind e outra por sequências de Cauchy. Apresenta-se uma construção dos números racionais por classes de equivalência, para que o leitor tenha um alicerce que sirva de apoio para um bom entendimento das construções propostas dos números reais. Utiliza-se o método axiomático para as construções que são feitas sobre números reais, com o intuito de mostrar a existência de um corpo ordenado e completo e caracterizá-lo. Discute-se ainda...

Factors influencing German private equity investment in US real estate

Paelmo, Kay L. (Kay Lee), 1977-
Fonte: Massachusetts Institute of Technology Publicador: Massachusetts Institute of Technology
Tipo: Tese de Doutorado Formato: 78 leaves; 4969965 bytes; 4969773 bytes; application/pdf; application/pdf
ENG
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This thesis identifies and ranks in order of importance the key factors influencing high net-worth German investors' decisions about US real estate private equity investments. Through research and in-depth interviews with key clients and investment advisors of Taurus Investment Holdings, LLC, each factor is examined based on available data and is ranked in a significance hierarchy according to client responses. Interview results indicate that "Higher Expected Returns in US Real Estate," "Trust in the Investment Advisor/Company," and "Diversification" are the three most influential factors for investor decisions about US real estate investment. Investors reported that exogenous factors such as German and US tax laws, US economic/political climate, and currency exchange rates are not as important. However, these exogenous factors are intimately linked to the more personal factors: both rational (Higher expected returns in US real estate, Diversification benefits) and emotional ones (Trust in the Investment Advisor). Furthermore, investors' decisions to invest in US real estate is crucially dependent on their trust in the investment advisor, regardless of high promised returns or diversification benefits. In a global recession where the sagging US economy and the weakening US dollar have eroded the returns for German investors with US real estate investments...

Continuous rational functions on real and $p$-adic varieties

Kollár, János
Fonte: Universidade Cornell Publicador: Universidade Cornell
Tipo: Artigo de Revista Científica
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This note studies, and partially solves, 3 elementary questions about continuous rational functions on real (and p-adic) algebraic varieties: Can one restrict such a function to a subvariety? Can one extend such a function from a subvariety? Which linear equations can be solved using such functions?; Comment: This paper, while correct, is superseded by 1301.5048: Koll\'ar--Nowak: Continuous rational functions on real and $p$-adic varieties II

A Representation of Real and Complex Numbers in Quantum Theory

Benioff, Paul
Fonte: Universidade Cornell Publicador: Universidade Cornell
Tipo: Artigo de Revista Científica
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A quantum theoretic representation of real and complex numbers is described here as equivalence classes of Cauchy sequences of quantum states of finite strings of qubits. There are 4 types of qubits each with associated single qubit annihilation creation (a-c) operators that give the state and location of each qubit type on a 2 dimensional integer lattice. The string states, defined as finite products of creation operators acting on the qubit vacuum state correspond to complex rational numbers with real and imaginary components. These states span a Fock space. Arithmetic relations and operations are defined for the string states. Cauchy sequences of these states are defined, and the arithmetic relations and operations lifted to apply to these sequences. Based on these, equivalence classes of these sequences are seen to have the requisite properties of real and complex numbers. The representations have some interesting aspects. Quantum equivalence classes are larger than their corresponding classical classes, but no new classes are created. There exist Cauchy sequences such that each state in the sequence is an entangled superposition of the real and imaginary components, yet the sequence is a real number. Also, except for coefficients of superposition states...

Real characters in blocks

Hethelyi, Laszlo; Horvath, Erzsebet; Szabo, Endre
Fonte: Universidade Cornell Publicador: Universidade Cornell
Tipo: Artigo de Revista Científica
Publicado em 16/03/2011
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We consider real versions of Brauer's k(B) conjecture, Olsson's conjecture and Eaton's conjecture. We prove the real version of Eaton's conjecture for 2-blocks of groups with cyclic defect group and for the principal 2-blocks of groups with trivial real core. We also characterize G-classes, real and rational G-classes of the defect group of a block B.

Real closed * reduced partially ordered rings

Capco, Jose
Fonte: Universidade Cornell Publicador: Universidade Cornell
Tipo: Artigo de Revista Científica
Publicado em 01/06/2009
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In this work we attempt to generalize our result in [6] [7] for real rings (not just von Neumann regular real rings). In other words we attempt to characterize and construct real closure * of commutative unitary rings that are real. We also make some very interesting and significant discoveries regarding maximal partial orderings of rings, Baer rings and essentail extension of rings. The first Theorem itself gives us a noteworthy bijection between maximal partial orderings of two rings by which one is a rational extension of the other. We characterize conditions when a Baer reduced ring can be integrally closed in its total quotient ring. We prove that Baer hulls of rings have exactly one automorphism (the identity) and we even prove this for a general case (Lemma 12). Proposition 14 allows us to study essential extensions of rings and their relation with minimal prime spectrum of the lower ring. And Theorem 15 gives us a construction of the real spectrum of a ring generated by adjoining idempotents to a reduced commutative subring (for instance the construction of Baer hull of reduced commutative rings). From most of the above interesting theories we prove that there is a bijection between the real closure * of real rings (upto isomorphisms) and their maximal partial orderings. We then attempt to develop some topological theories for the set of real closure * of real rings (upto isomorphism) that will help us give a topological characterization in terms of the real and prime spectra of these rings. The topological characterization will be revealed in a later work. It is noteworthy to point out that we can allow ourself to consider mostly the minimal prime spectrum of the real ring in order to develop our topological theories.; Comment: 17pages. Part of PhD dissertation

On nowhere continuous Costas functions and infinite Golomb rulers

Drakakis, Konstantinos
Fonte: Universidade Cornell Publicador: Universidade Cornell
Tipo: Artigo de Revista Científica
Publicado em 06/10/2008
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We prove the existence of nowhere continuous bijections that satisfy the Costas property, as well as (countably and uncountably) infinite Golomb rulers. We define and prove the existence of real and rational Costas clouds, namely nowhere continuous Costas injections whose graphs are everywhere dense in a region of the real plane, based on nonlinear solutions of Cauchy's functional equation. We also give 2 constructive examples of a nowhere continuous function, that satisfies a constrained form of the Costas property (over rational or algebraic displacements only, that is), based on the indicator function of a dense subset of the reals.

Counting Zeros of Harmonic Rational Functions and Its Application to Gravitational Lensing

Bleher, Pavel M.; Homma, Youkow; Ji, Lyndon L.; Roeder, Roland K. W.
Fonte: Universidade Cornell Publicador: Universidade Cornell
Tipo: Artigo de Revista Científica
Relevância na Pesquisa
45.58%
General Relativity gives that finitely many point masses between an observer and a light source create many images of the light source. Positions of these images are solutions of $r(z)=\bar{z},$ where $r(z)$ is a rational function. We study the number of solutions to $p(z) = \bar{z}$ and $r(z) = \bar{z},$ where $p(z)$ and $r(z)$ are polynomials and rational functions, respectively. Upper and lower bounds were previously obtained by Khavinson-\'{S}wi\c{a}tek, Khavinson-Neumann, and Petters. Between these bounds, we show that any number of simple zeros allowed by the Argument Principle occurs and nothing else occurs, off of a proper real algebraic set. If $r(z) = \bar{z}$ describes an $n$-point gravitational lens, we determine the possible numbers of generic images.; Comment: 15 pages, 2 figures. To appear in International Mathematics Research Notices (IMRN)

Periodic representations and rational approximations of square roots

Abrate, Marco; Barbero, Stefano; Cerruti, Umberto; Murru, Nadir
Fonte: Universidade Cornell Publicador: Universidade Cornell
Tipo: Artigo de Revista Científica
Publicado em 22/09/2014
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In this paper the properties of R\'edei rational functions are used to derive rational approximations for square roots and both Newton and Pad\'e approximations are given as particular cases. As a consequence, such approximations can be derived directly by power matrices. Moreover, R\'edei rational functions are introduced as convergents of particular periodic continued fractions and are applied for approximating square roots in the field of p-adic numbers and to study periodic representations. Using the results over the real numbers, we show how to construct periodic continued fractions and approximations of square roots which are simultaneously valid in the real and in the p-adic field.

Decompositions of rational functions over real and complex numbers and a question about invariant curves

Müller, Peter
Fonte: Universidade Cornell Publicador: Universidade Cornell
Tipo: Artigo de Revista Científica
Publicado em 25/02/2015
Relevância na Pesquisa
45.66%
We consider the connection of functional decompositions of rational functions over the real and complex numbers, and a question about curves on a Riemann sphere which are invariant under a rational function.; Comment: 14 pages

Fields of Iterated Quantum Reference Frames based on Gauge Transformations of Rational String States

Benioff, Paul
Fonte: Universidade Cornell Publicador: Universidade Cornell
Tipo: Artigo de Revista Científica
Publicado em 18/04/2006
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45.75%
This work is based on a description of quantum reference frames that seems more basic than others in the literature. Here a frame is based on a set of real and of complex numbers and a space time as a 4-tuple of the real numbers. There are many isomorphic frames as there are many isomorphic sets of real numbers. Each frame is suitable for construction of all physical theories as mathematical structures over the real and complex numbers. The organization of the frames into a field of frames is based on the representations of real and complex numbers as Cauchy operators defined on complex rational states of finite qubit strings. The structure of the field is based on noting that the construction of real and complex numbers as Cauchy operators in a frame can be iterated to create new frames coming from a frame. Gauge transformations on the rational string states greatly expand the number of quantum frames as, for each gauge U, there is one frame coming from the original frame. Forward and backward iteration of the construction yields a two way infinite frame field with satisfying properties. There is no background space time and there are no real or complex numbers for the field as a whole. Instead these are relative concepts associated with each frame in the field. Extension to include qukit strings for different k bases...

Continuous rational functions on real and $p$-adic varieties II

Kollár, János; Nowak, Krzysztof
Fonte: Universidade Cornell Publicador: Universidade Cornell
Tipo: Artigo de Revista Científica
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45.6%
This note replaces two earlier preprints (1101.3737 by Koll\'ar) and (1211.6681 by Nowak). It studies, and partially solves, 3 elementary questions about continuous rational functions on real (and p-adic) algebraic varieties: Can one restrict such a function to a subvariety? Can one extend such a function from a subvariety? Which linear equations can be solved using such functions? v.2: Section 3 simplified and typos corrected.; Comment: supercedes arXiv:1101.3737

Meadows and the equational specification of division

Bergstra, J. A.; Hirshfeld, Y.; Tucker, J. V.
Fonte: Universidade Cornell Publicador: Universidade Cornell
Tipo: Artigo de Revista Científica
Publicado em 07/01/2009
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45.6%
The rational, real and complex numbers with their standard operations, including division, are partial algebras specified by the axiomatic concept of a field. Since the class of fields cannot be defined by equations, the theory of equational specifications of data types cannot use field theory in applications to number systems based upon rational, real and complex numbers. We study a new axiomatic concept for number systems with division that uses only equations: a meadow is a commutative ring with a total inverse operator satisfying two equations which imply that the inverse of zero is zero. All fields and products of fields can be viewed as meadows. After reviewing alternate axioms for inverse, we start the development of a theory of meadows. We give a general representation theorem for meadows and find, as a corollary, that the conditional equational theory of meadows coincides with the conditional equational theory of zero totalized fields. We also prove representation results for meadows of finite characteristic.

The projective translation equation and rational plane flows. I

Alkauskas, Giedrius
Fonte: Universidade Cornell Publicador: Universidade Cornell
Tipo: Artigo de Revista Científica
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Let X=(x,y). A plane flow is a function F(X,t): R^2*R->R^2 such that F(F(X,s),t)=F(X,s+t) for (almost) all real numbers x,y,s,t (the function F might not be well-defined for certain x,y,t). In this paper we investigate rational plane flows which are of the form F(X,t)=f(Xt)/t; here f is a pair of rational functions in 2 real variables. These may be called projective flows, and for a description of such flows only the knowledge of Cremona group in dimension 1 is needed. Thus, the aim of this work is to completely describe over R all rational solutions of the two dimensional translation equation (1-z)f(X)=f(f(Xz)(1-z)/z). We show that, up to conjugation with a 1-homogenic birational plane transformation (1-BIR), all solutions are as follows: a zero flow, two singular flows, an identity flow, and one non-singular flow for each non-negative integer N, called the level of the flow. The case N=0 stands apart, while the case N=1 has special features as well. Conjugation of these canonical solutions with 1-BIR produce a variety of flows with different properties and invariants, depending on the level and on the conjugation itself. We explore many more features of these flows; for example, there are 1, 4, and 2 essentially different symmetric flows in cases N=0...

On the Real Multidimensional Rational K-Moment Problem

Cimpric, Jaka; Marshall, Murray; Netzer, Tim
Fonte: Universidade Cornell Publicador: Universidade Cornell
Tipo: Artigo de Revista Científica
Relevância na Pesquisa
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We present a solution to the real multidimensional rational K-moment problem, where K is defined by finitely many polynomial inequalities. More precisely, let S be a finite set of real polynomials in X=(X_1,...,X_n) such that the corresponding basic closed semialgebraic set K_S is nonempty. Let E=D^{-1}R[X] be a localization of the real polynomial algebra, and T_S^E the preordering on E generated by S. We show that every linear functional L on E that is nonnegative on T_S^E is represented by a positive measure on a certain subset of K_S, provided D contains an element that grows fast enough on K_S.; Comment: 20 pages