A gap between hyponormality and subnormality for block Toeplitz operators

AbstractThis paper concerns a gap between hyponormality and subnormality for block Toeplitz operators. We show that there is no gap between 2-hyponormality and subnormality for a certain class of trigonometric block Toeplitz operators (e.g., its co-analytic outer coefficient is invertible). In addition we consider the extremal cases for the hyponormality of trigonometric block Toeplitz operators: in this case, hyponormality and normality coincide

Strategic Asset Allocation Of Credit Guarantors

How to manage the portfolio of credit guarantors is important in practice and public policy, but has not been investigated well in the prior literature. We empirically compare four different approaches in managing credit guarantor portfolios. The four approaches are equal weighted, minimum variance, mean variance optimization and equal risk contribution methods. In terms of risk return ratio, the mean variance optimization model performs best in out-of-sample test. This result contrasts with previous findings against mean variance optimization. Our results are robust. The results do not change as the characteristics of guarantee portfolio vary

Cross-border expansion strategy of U.S. real estate development firms : entry and operation models in Brazil

Thesis (S.M. in Real Estate Development)--Massachusetts Institute of Technology, Program in Real Estate Development in Conjunction with the Center for Real Estate, 2013.This electronic version was submitted by the student author. The certified thesis is available in the Institute Archives and Special Collections.Cataloged from student-submitted PDF version of thesis.Includes bibliographical references (pages 58-60).Over the past several decades, technological advances, the spread of free-market ideology and the shifting of the economic center of the world have resulted in an incredible transformation of the world into a globalized, interdependent place. The term "globalization" has become an essential keyword associated with business in the modern world, creating great opportunities for U.S. firms to seek future growth potential in the global arena, especially in emerging markets that are undergoing rapid economic development. Although the real estate industry has achieved some level of globalization in general, the development sector is one area of a broad real estate industry that has yet to show significant strides in global expansion activities. The purpose of this study is to examine the current business landscape of U.S. real estate developers' globalization efforts and to create a qualitative analysis of why globalization works / does not work for real estate developers based in the U.S. The ultimate question the study asks and answers is what are the key strategies that U.S.-based real estate developers should use to develop real estate property in emerging markets (Brazil, in particular)? Brazil was extensively investigated as the topic of this research. The research discovered some development risks in Brazil associated with the high levels of bureaucracy, tenants' perception of the product and lack of market intermediaries. A number of American real estate development firms have successfully overcome these hurdles by forming strategic alliances with local partners and adequately responding to cultural and administrative distances between Brazil and the U.S.by Dan (Dong Woo) Kang.S.M.in Real Estate Developmen

A Study on the Effect on River Habitat Change by small dam removal - A Case Study of Gokreung 2 & Gotan Small Dam Removal

Source: ICHE Conference Archive - https://mdi-de.baw.de/icheArchiv

Control of size and physical properties of graphene oxide by changing the oxidation temperature

The size and the physical properties of graphene oxide sheets were controlled by changing the oxidation temperature of graphite. Graphite oxide (GO) samples were prepared at different oxidation temperatures of 20 degrees C, 27 degrees C and 35 degrees C using a modified Hummers' method. The carbon-to-oxygen (C/O) ratio and the average size of the GO sheets varied according to the oxidation temperature: 1.26 and 12.4 mu m at 20 degrees C, 1.24 and 10.5 mu m at 27 degrees C, and 1.18 and 8.5 mu m at 35 degrees C. This indicates that the C/O ratio and the average size of the graphene oxide sheets respectively increase as the oxidation temperature decreases. Moreover, it was observed that the surface charge and optical properties of the graphene oxide sheets could be tuned by changing the temperature. This study demonstrates the tunability of the physical properties of graphene oxide sheets and shows that the properties depend on the functional groups generated during the oxidation process.clos

Timing information at HL-LHC: complete determination of masses of dark matter and long lived particle

A long-standing kinematic challenge in data analysis at hadron colliders is the determination of the masses of invisible particles. This issue is particularly relevant in searches for evidence of dark matter production, which remains one of the prominent targets of future collider experiments. In this paper, we show that the additional information from the precision timing measurements, provided by planned detector upgrades during the high- luminosity run of the LHC (HL-LHC), allows for previously unrealizable measurements of invisible particle kinematics. As a concrete example, we focus on the signal of pair produced long-lived particles (LLP1,2), each decaying with a displaced vertex to visible (V1,2) and invisible (I1,2) final state particles, pp → LLP1 + LLP2 → (V1 + I1) + (V2 + I2). We explicitly show that the complete kinematics of the invisible particles in such events can be determined with the addition of timing information, and evaluate the precision with which the masses of new long-lived and invisible particles can be determined

Timing information at HL-LHC: Complete determination of masses of Dark Matter and Long lived particle

A long standing problem in kinematics at the hadron colliders is to determine the mass of invisible particles. This issue is particularly important for the signals of dark matter, which becomes one of the prominent targets of future collider experiments. In this paper, we show that the additional information from the precise timing measurement, which will be available at the planned high-liminosity run of the LHC (HL-LHC), will shade new light on the kinematics study. As a concrete example, we focus on the signal of the pair produced long-lived particles ($LLP_{1,2}$), respectively leaving displaced vertex with visible ($V_{1,2}$) and invisible ($I_{1,2}$) final state, $pp \to LLP_1+LLP_2 \to (V_1+I_1)+(V_2+I_2)$. We explicitly show that this system is completely solvable with timing information.Comment: 14 pages, 5 figure

Both Basic and Acidic Amino Acid Residues of IpTxa Are Involved in Triggering Substate of RyR1

Imperatoxin A (IpTxa) is known to modify the gating of skeletal ryanodine receptor (RyR1). In this paper, the ability of charged aa residues of IpTxa to induce substate of native RyR1 in HSR was examined. Our results show that the basic residues (e.g., Lys19, Lys20, Lys22, Arg23, and Arg24) are important for producing substate of RyR1. In addition, other basic residues (e.g., Lys30, Arg31, and Arg33) near the C-terminus and some acidic residues (e.g., Glu29, Asp13, and Asp2) are also involved in the generation of substate. Residues such as Lys8 and Thr26 may be involved in the self-regulation of substate of RyR1, since alanine substitution of the aa residues led to a drastic conversion to the substate. The modifications of the channel gating by the wild-type and mutant toxins were similar in purified RyR1. Taken together, the specific charge distributions on the surface of IpTxa are essential for regulation of the channel gating of RyR1

DeeLeMa: Missing information search with Deep Learning for Mass estimation

We present DeeLeMa, a deep learning network to analyze energies and momenta in particle collisions at high energy colliders, especially DeeLeMa is constructed based on symmetric event topology, and the generated mass distributions show robust peaks at the physical masses after the combinatoric uncertainties, and detector smearing effects are taken into account. DeeLeMa can be widely used in different event topologies by adopting the corresponding kinematic symmetries