cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
The Bose-Hubbard model with localized particle losses
Creators: name: Kepesidis, Kosmas
name: Hartmann, Michael J.
Publisher: name: arXiv
Year: 2012
Subjects: subject: Quantum Gases (cond-mat.quant-gas)
subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: We consider the Bose-Hubbard model with particle losses at one lattice site. For the non-interacting case, we find that half of the bosons of an initially homogeneous particle distribution, are not affected by dissipation that only acts on one lattice site in the center of the lattice. A physical interpretation of this result is that the surviving particles interfere destructively when they tunnel to the location of the dissipative defect and therefore never reach it. Furthermore we find for a one-dimensional model that a fraction of the particles can propagate across the dissipative defect even if the rate of tunneling between adjacent lattice sites is much slower than the loss rate at the defect. In the interacting case, the phase coherence is destroyed and all particles eventually decay. We thus analyze the effect of small interactions and small deviations from the perfectly symmetric setting on the protection of the particles against the localized losses. A possible experimental realization of our setup is provided by ultracold bosonic atoms in an optical lattice, where an electron beam on a single lattice site ionizes atoms that are then extracted by an electrostatic field.
description: 10 pages, 5 figures, minor revisions to previous version
Summary-Based Pointer Analysis Framework for Modular Bug Finding
Creators: name: Buss, Marcio
Publisher: name: Columbia University
Year: 2008
Subjects: Computer science

description: Modern society is irreversibly dependent on computers and, consequently, on software. However, as the complexity of programs increase, so does the number of defects within them. To alleviate the problem, automated techniques are constantly used to improve software quality. Static analysis is one such approach in which violations of correctness properties are searched and reported. Static analysis has many advantages, but it is necessarily conservative because it symbolically executes the program instead of using real inputs, and it considers all possible executions simultaneously. Being conservative often means issuing false alarms, or missing real program errors. Pointer variables are a challenging aspect of many languages that can force static analysis tools to be overly conservative. It is often unclear what variables are affected by pointer-manipulating expressions, and aliasing between variables is one of the banes of program analysis. To alleviate that, a common solution is to allow the programmer to provide annotations such as declaring a variable as unaliased in a given scope, or providing special constructs such as the "never-null" pointer of Cyclone. However, programmers rarely keep these annotations up-to-date. The solution is to provide some form of pointer analysis, which derives useful information about pointer variables in the program. An appropriate pointer analysis equips the static tool so that it is capable of reporting more errors without risking too many false alarms. This dissertation proposes a methodology for pointer analysis that is specially tailored for "modular bug finding." It presents a new analysis space for pointer analysis, defined by finer-grain "dimensions of precision," which allows us to explore and evaluate a variety of different algorithms to achieve better trade-offs between analysis precision and efficiency. This framework is developed around a new abstraction for computing points-to sets, the Assign-Fetch Graph, that has many interesting features. Empirical evaluation shows promising results, as some unknown errors in well-known applications were discovered.
Exploring gaps in monitoring and evaluation of male engagement in family planning
Creators: name: Adamou, Bridgit M.
name: Iskarpatyoti, Brittany S.
name: Mejia, Carolina
name: Agala, Chris B.
Publisher: name: F1000Research
Year: 2019

description:
Background: Male engagement is becoming more common in family planning (FP) strategies and interventions, yet effective monitoring and evaluation (M&E) of this approach lags. This review sought to understand how male engagement in FP is defined, identify gaps in M&E of male engagement and make recommendations. Methods: We conducted key informant interviews and a desk review of peer-reviewed articles and gray literature, including national FP strategies and policies.  We then facilitated an online forum with experts in the field of male engagement in FP to provide feedback on our proposed indicators for male engagement in FP to reach consensus on and validate key indicators. Results: Although there is no universal definition of male engagement in FP, the most common definition is the inclusion of men in FP programming as FP clients, supportive partners, and agents of change. The most common approach was engaging men as clients exclusively, followed by engaging men as partners. Few papers reported on programs that engaged men across the full spectrum of the definition. There's significant variation in the degree to which male engagement in FP is included in M&E, planning, and approaches. Few programs reported findings disaggregated by sex and by contraceptive method, making it difficult to determine the effect of programming on male use of methods. There is a dearth of indicators for measuring male engagement in FP in national strategies and policies. Other gaps are a lack of core indicators for male engagement, qualitative indicators, and indicator reference sheets for many commonly used indicators. Among over 100 indicators being used to monitor and evaluate male engagement in FP, 15 key indicators were identified and validated, with accompanying guidance. Conclusions: As programming for male engagement in FP increases, coordinated efforts should be made to improve the systems that collect, analyze, and use data.
title: Methane emissions from gathering and boosting compressor stations in the U.S. Supporting volume 3: Emission factors, station estimates, and national emissions
title: Volume 3: Emission factors, station estimates, and national emissions
titleType: AlternativeTitle
title: Emission factors, station estimates, and national emissions
titleType: AlternativeTitle
Creators: name: Zimmerle, Daniel
name: Vaughn, Timothy
name: Luck, Benjamin
name: Lauderdale, Terri
name: Keen, Kindal
name: Harrison, Matthew
name: Marchese, Anthony
name: Williams, Laurie
name: Allen, David
Publisher: name: Mountain Scholar
Year: 2019
Subjects: methane
emission factors
national model
greenhouse gases
gathering facilities

description: October 2019 revision.
description: Authors are from: Energy Institute at Colorado State University, AECOM, SLR Consulting, Fort Lewis College, and University of Texas, Austin, Texas, USA.
description: This section provides an overview of the field campaign for the entire project and the data collected in the field campaign data and during the analysis phase of the project.
Limited Arbitrage Is Necessary and Sufficient for the Existence of a Competitive Equilibrium
Creators: name: Chichilnisky, Graciela
Publisher: name: Columbia University
Year: 1992
Subjects: Economics

description: A condition of limited arbitrage is defined on the endowments and the preferences of the traders in an Arrow-Debreu economy. It bounds the diversity of the traders in the economy, and the gains from trade which they can afford from initial endowments. Theorem 1 shows that limited arbitrage is necessary and sufficient for the existence of a competitive equilibrium, when consumption sets are either positive orthants or the whole euclidean space. The results apply therefore to market economies with or without bounds on short sales. Theorem 6 establishes that an Arrow-Debreu economy has a competitive equilibrium if and only if every subeconomy with N + 1 traders does, where N is the number of commodities. Limited arbitrage has been shown elsewhere to be equivalent to the contractibility of spaces of preferences, and therefore, by the results of Chichilnisky and Heal [12], to be necessary and sufficient for the existence of social choice rules defined on individual preferences over allocations, rules which are continuous, anonymous and respect unanimity.
Nature of an intermediate non-Fermi liquid state in Ge-substituted YbRh$_{2}$Si$_{2}$: Fermionized skyrmions, Lifshitz transition, Skyrmion liquid, and Gruneisen ratio
Creators: name: Kim, Ki-Seok
Publisher: name: arXiv
Year: 2012
Subjects: subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: FOS: Physical sciences

description: We propose a skyrmion liquid state for the non-Fermi liquid (NFL) phase in Ge-substituted YbRh$_{2}$Si$_{2}$, where skyrmions form their Fermi surface, argued to result from the strongly coupled nature between skyrmions and itinerant electrons. The fermionized skyrmion theory identifies the antiferromagnetic (AF) transition with the Lifshitz transition, where the quantum critical point (QCP) is characterized by the dynamical critical exponent $z = 2$. Nonlocal interactions between skyrmions allow a critical line above the AF QCP, which originates from the Kondo-coupling effect with itinerant electrons. This critical line is described by the skyrmion liquid state, which results in Landau damping for spin fluctuations, thus characterized by $z = 3$. As a result, the Gruneisen ratio is predicted to change from $\sim T^{-1}$ at the AF QCP to $\sim T^{-2/3}$ in the NFL phase.
On the Infeasibility of Modeling Polymorphic Shellcode for Signature Detection
Creators: name: Song, Yingbo
name: Locasto, Michael E.
name: Stavrou, Angelos
name: Keromytis, Angelos D.
name: Stolfo, Salvatore
Publisher: name: Columbia University
Year: 2007
Subjects: Computer science

description: POlymorphic malcode remains one of the most troubling threats for information security and intrusion defense systems. The ability for malcode to be automatically transformed into a semantically equivalent variant frustrates attempts to construct a single, simple, easily verifiable representation. We present a quantitative analysis of the strengths and limitations of shellcode polymorphism and consider the impact of this analysis on the current practices in intrusion detection. Our examination focuses on the nature of shellcode 'decoding routines', and the empirical evidence we gather illustrate our mail result: that the challenge of modeling the class of self-modifying code is likely intractable - even when the size of the instruction sequence (i.e. the decoder) is relatively small. We develop metrics to gauge the power of polymorphic engines and use them to provide insight into the strengths and weaknesses of some popular engines. We believe this analysis supplies a novel and useful way to understand the limitations of the current generation of signature-based techniques. We analyze some contemporary polymorphic techniques, explore ways to improve them in order to forecast the nature of future threats, and present our suggestions for countermeasures. Our resulsts indicate that the class of polymorphic behavior is too greatly spread and varied to model effectively. We conclude that modeling normal content is ultimately a more promising defense mechanism than modeling malicious or abnormal content.
Resistive Solutions for Pulsar Magnetospheres
Creators: name: Li, Jason
name: Spitkovsky, Anatoly
name: Tchekhovskoy, Alexander
Publisher: name: arXiv
Year: 2011
Subjects: subject: High Energy Astrophysical Phenomena (astro-ph.HE)
subject: FOS: Physical sciences

description: The current state of the art in the modeling of pulsar magnetospheres invokes either the vacuum or force-free limits for the magnetospheric plasma. Neither of these limits can simultaneously account for both the plasma currents and the accelerating electric fields that are needed to explain the morphology and spectra of high-energy emission from pulsars. To better understand the structure of such magnetospheres, we combine accelerating fields and force-free solutions by considering models of magnetospheres filled with resistive plasma. We formulate Ohm's Law in the minimal velocity fluid frame and construct a family of resistive solutions that smoothly bridges the gap between the vacuum and the force-free magnetosphere solutions. The spin-down luminosity, open field line potential drop, and the fraction of open field lines all transition between the vacuum and force-free values as the plasma conductivity varies from zero to infinity. For fixed inclination angle, we find that the spin-down luminosity depends linearly on the open field line potential drop. We consider the implications of our resistive solutions for the spin down of intermittent pulsars and sub-pulse drift phenomena in radio pulsars.
description: 13 pages, 6 figures, final version, accepted to ApJ
A bilateral shear layer between two parallel Couette flows
Creators: name: Narasimhamurthy, Vagesh D.
name: Ellingsen, Simen Å.
name: Andersson, Helge I.
Publisher: name: arXiv
Year: 2012
Subjects: subject: Fluid Dynamics (physics.flu-dyn)
subject: FOS: Physical sciences

description: We consider a shear layer of a kind not previously studied to our knowledge. Contrary to the classical free shear layer, the width of the shear zone does not vary in the streamwise direction but rather exhibits a lateral variation. Based on some simplifying assumptions, an analytic solution has been derived for the new shear layer. These assumptions have been justified by a comparison with numerical solutions of the full Navier-Stokes equations, which accord with the analytical solution to better than 1% in the entire domain. An explicit formula is found for the width of the shear zone as a function of wall-normal coordinate. This width is independent of wall velocities in the laminar regime. Preliminary results for a co-current laminar-turbulent shear layer in the same geometry are also presented. Shear-layer instabilities were then developed and resulted in an unsteady mixing zone at the interface between the two co-current streams.
description: 6 pages, 7 figures. Accepted for publication in Phys. Rev. E
3D mesh watermarking
Creators: name: Eshraghi Boroojeni, Mahsa
Publisher: name: University of Calgary
Year: 2008

description: Bibliography: p. 114-126
description: Some pages are in colour
description: 3D watermarking methods embed a hidden watermark into 3D models for the main purpose of copyright protection and content authentication. The growing use of 3D models in various fields of industry, such as games, animation, virtual reality, and cultural heritage, along with the possibility of easy reproduction and distribution, has drawn the attention to copyright protection of 3D models. This thesis develops a watermarking framework for polygonal meshes that attains robustness against a list of accessible attacks. A watermark is embedded into the geometry of a mesh by perturbing the mesh vertices along t heir tangent space to achieve invisibility. The mesh capacity for the embedded watermark can be as high as the number of its vertices, which is usually a fairly large number. To sort out the issue of robustness, a list of the most accessible attacks through common graphics tools is proposed that includes affine transformations, geometrical deformations, topological attacks, subdivision attacks, vertex reordering, and combination of these attacks. To achieve robustness against the proposed list of attacks, a set of attack recovery techniques are developed. Geometric segmentation is proposed to recover the inserted watermark against geometrical deformations and topological attacks. Geometric indexing is performed to resist vertex reordering attacks. Robustness against affine transformations is achieved through a coordinate normalization scheme. Finally, a resolution normalization scheme is proposed to resist the subdivision attacks.
Experiences of ethnic minorities with chronic illness accessing primary health care
Creators: name: Kensall, Sherri Lynn
Publisher: name: University of British Columbia
Year: 2011

description: Living with a chronic illness such as diabetes or heart disease and accessing health care over many years can be a challenge for anyone. This experience is further impacted by experiences associated with being an ethnic minority where challenges in communicating with health care providers or encountering different views on health care can make navigating the system more difficult. Within the current health care system in British Columbia, the Primary Health Care (PHC) Charter articulates a clear role for PHC as the setting in which chronic illness care is organized and delivered. Unfortunately, interactions in PHC can be both a source of support and of stress for individuals. In order to provide care which supports individuals to self manage their health, it is important that PHC providers understand common experiences and priorities for diverse populations when seeking care in the ongoing management of their condition. Through secondary analysis, this study analyzes data from a recent research project exploring the experiences of ethnic minorities in PHC by Dr Wong. Data from twelve focus groups with a subset of participants with chronic illness was examined to further advance aspects of chronic illness management within the context of the current health care environment in British Columbia (BC). This data was viewed within a critical cultural perspective to inform both current and future practice in order to promote care which is culturally safe and at the same time supports individuals in adopting healthier lifestyles and maximizing their confidence in managing their health. Results from this study highlight the challenges encountered by anyone managing a chronic illness but also how ethnic minorities may face an increased burden of illness. This study also explores how approaches in the charter, specifically the expanded chronic care model, need to be viewed critically in terms of the potential to promote a sense of individual responsibility for care or further racialization through subcategorizing individuals based on ethnicity. This study also highlights benefits in the approaches to CDM especially in the investments in resources in multiple languages and potential for building stronger linkages to community programs.
Density of States of Quantum Spin Systems from Isotropic Entanglement
Creators: name: Movassagh, Ramis
name: Edelman, Alan
Publisher: name: arXiv
Year: 2011
Subjects: subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: Statistical Mechanics (cond-mat.stat-mech)
subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: We propose a method which we call "Isotropic Entanglement" (IE), that predicts the eigenvalue distribution of quantum many body (spin) systems (QMBS) with generic interactions. We interpolate between two known approximations by matching fourth moments. Though, such problems can be QMA-complete, our examples show that IE provides an accurate picture of the spectra well beyond what one expects from the first four moments alone. We further show that the interpolation is universal, i.e., independent of the choice of local terms.
description: 4+ pages, content is as in the published version
Total electron content disturbances prior to Great Tohoku March 11, 2011 and October 23, 2011 Turkey Van earthquakes and their physical interpretation
Creators: name: Zolotov, O. V.
name: Namgaladze, A. A.
name: Prokhorov, B. E.
Publisher: name: arXiv
Year: 2012
Subjects: subject: Space Physics (physics.space-ph)
subject: Geophysics (physics.geo-ph)
subject: FOS: Physical sciences

description: This paper discusses the GPS (Global Positioning System) observed TEC (Total Electron Content) variations prior to the M 9.0 Great Tohoku (Japan, Sendai) March 11, 2011 and M 7.1 Oct. 23, 2011 Turkey Van earthquakes as possible seismo-ionosphere precursors. We have formulated a set of the TEC phenomenological features often reported as precursors to strong earthquakes based on our experience and publications' analysis. This feature-set has been applied to the relative TEC deviations for time intervals March 08-11, 2011 and Oct. 20-23, 2011 preceding M 9.0 Great Tohoku (Japan) March 11 and Turkey Van Oct. 23 earthquakes, respectively. In both cases there have been revealed strong local long-living (of about several hours) TEC disturbances at the near-epicenter and magnetically conjugated areas. These disturbances may be treated as seismo-ionospheric precursors. The physical mechanism for the observed TEC structures for these two as well as for other cases of recent strong seismic events has been proposed. The anomalies have been interpreted and explained on the base of this physical mechanism from the origin hypothesis point of view in terms of electromagnetic lithosphere-ionosphere coupling.
BARTER: Profile Model Exchange for Behavior-Based Access Control and Communication Security in MANETs
Creators: name: Frias-Martinez, Vanessa
name: Stolfo, Salvatore
name: Keromytis, Angelos D.
Publisher: name: Columbia University
Year: 2007
Subjects: Computer science

description: There is a considerable body of literature and technology that provides access control and security of communication for Mobile Ad-hoc Networks (MANETs) based on cryptographic authentication technologies and protocols. We introduce a new method of granting access and securing communication in a MANET environment to augment, not replace, existing techniques. Previous approaches grant access to the MANET, or to its services, merely by means of an authenticated identity or a qualified role. We present BARTER, a framework that, in addition, requires nodes to exchange a model of their behavior to grant access to the MANET and to assess the legitimacy of their subsequent communication. This framework forces the nodes not only to say who or what they are, but also how they behave. BARTER will continuously run membership acceptance and update protocols to give access to and accept traffic only from nodes whose behavior model is considered "normal" according to the behavior model of the nodes in the MANET. We implement and experimentally evaluate the merger between BARTER and other cryptographic technologies and show that BARTER can implement a fully distributed automatic access control and update with small cryptographic costs. Although the methods proposed involve the use of content-based anomaly detection models, the generic infrastructure implementing the methodology may utilize any behavior model. Even though the experiments are implemented for MANETs, the idea of model exchange for access control can be applied to any type of network.
Development and Validation of an Open Architecture for Autonomous Vehicle Control IV 2023.pdf
Creators: name: Valle Barrio, Alfredo
name: Morales Alvarez, Walter
name: Olaverri-Monreal, Cristina
name: Eugenio Naranjo Hernandez, José
Publisher: name: figshare
Year: 2023
Subjects: Autonomous vehicle systems

description: Teams dedicated to research in the field of au?tonomous vehicles can be found in many universities and research centers, but they often face the challenge of finding a suitable platform for their work. The primary reason for this challenge is the inaccessibility and high cost of commercial autonomous vehicles, leading researchers to rely on simulators. This paper introduces a new software architecture designed to automate vehicles, providing all the necessary capabilities of an autonomous vehicle in a more cost-effective and efficient manner. The architecture is designed to be modular, universal, and with a public interface, making it easy to modify, adapt to any type of vehicle, and accessible to any researcher. The new software architecture has been implemented in two platforms: a vehicle integrated with OpenPilot via ROS2 without any external hardware, and a last-mile robot. A validation test was conducted with volunteers to assess the reaction of passengers while the car was driving autonomously. The results of this implementation demonstrate the potential of this new software architecture to provide a comprehensive and accessible platform for the advancement of autonomous vehicle research
The various manifestations of collisionless dissipation in wave propagation
Creators: name: Benisti, Didier
name: Morice, Olivier
name: Gremillet, Laurent
Publisher: name: arXiv
Year: 2011
Subjects: subject: Plasma Physics (physics.plasm-ph)
subject: FOS: Physical sciences

description: The propagation of an electrostatic wave packet inside a collisionless and initially Maxwellian plasma is always dissipative because of the irreversible acceleration of the electrons by the wave. Then, in the linear regime, the wave packet is Landau damped, so that in the reference frame moving at the group velocity, the wave amplitude decays exponentially with time. In the nonlinear regime, once phase mixing has occurred and when the electron motion is nearly adiabatic, the damping rate is strongly reduced compared to the Landau one, so that the wave amplitude remains nearly constant along the characteristics. Yet, we show here that the electrons are still globally accelerated by the wave packet, and, in one dimension, this leads to a non local amplitude dependence of the group velocity. As a result, a freely propagating wave packet would shrink, and, therefore, so would its total energy. In more than one dimension, not only does the magnitude of the group velocity nonlinearly vary, but also its direction. In the weakly nonlinear regime, when the collisionless damping rate is still significant compared to its linear value, this leads to an effective defocussing effect which we quantify, and which we compare to the self-focussing induced by wave front bowing.
description: 23 pages, 6 figures
Aequitas: A Trusted P2P System for Paid Content Delivery
Creators: name: Sherman, Alex
name: Chawla, Japinder
name: Nieh, Jason
name: Stein, Clifford S.
name: Sarma, Justin
Publisher: name: Columbia University
Year: 2007
Subjects: Computer science

description: P2P file-sharing has been recognized as a powerful and efficient distribution model due to its ability to leverage users' upload bandwidth. However, companies that sell digital content on-line are hesitant to rely on P2P models for paid content distribution due to the free file-sharing inherent in P2P models. In this paper we present Aequitas, a P2P system in which users share paid content anonymously via a layer of intermediate nodes. We argue that with the extra anonymity in Aequitas, vendors could leverage P2P bandwidth while effectively maintaining the same level of trust towards their customers as in traditional models of paid content distribution. As a result, a content provider could reduce its infrastructure costs and subsequently lower the costs for the end-users. The intermediate nodes are incentivized to contribute their bandwidth via electronic micropayments. We also introduce techniques that prevent the intermediate nodes from learning the content of the files they help transmit. In this paper we present the design of our system, an analysis of its properties and an implementation and experimental evaluation. We quantify the value of the intermediate nodes, both in terms of efficiency and their effect on anonoymity. We argue in support of the economic and technological merits of the system.
Filamentary Diffusion of Cosmic Rays on Small Scales
Creators: name: Giacinti, G.
name: Kachelriess, M.
name: Semikoz, D. V.
Publisher: name: arXiv
Year: 2012
Subjects: subject: High Energy Astrophysical Phenomena (astro-ph.HE)
subject: FOS: Physical sciences

description: We investigate the diffusion of cosmic rays (CR) close to their sources. Propagating individual CRs in purely isotropic turbulent magnetic fields with maximal scale of spatial variations Lmax, we find that CRs diffuse anisotropically at distances r
description: 5 pages (2 columns), 4 figures. Published in Physical Review Letters
การเปรียบเทียบคะแนนของทักษะด้านต่างๆในการสอบประมวลความรอบรู้ภาคปฏิบัติของนักศึกษาแพทย์ ชั้นปีที่ 6 คณะแพทยศาสตร์ศิริราชพยาบาล มหาวิทยาลัยมหิดล
Creators: name: พิราวรรณ หนูเสน
Publisher: name: กองบริหารการวิจัย
Year: 2564
Subjects: นักศึกษาแพทย์
OSCE
การซักประวัติ
การตรวจร่างกาย
การสื่อสาร
การทําหัตถการ
การแปลผล

description: วารสารวิทยาศาสตร์และเทคโนโลยี, 29, 3, 378-386
The Existence of an Optimal Path in a Growth Model with Endogenous Technical Change
Creators: name: Chichilnisky, Graciela
name: Gruenwald, Paul F.
Publisher: name: Columbia University
Year: 1992
Subjects: Economics

description: We find a growth path B which is not feasible, and which grows exponentially. This path B bounds all feasible paths. Using this bound we define a finite measure on the set of integers, A, and consider a "weighted" Banach space H\ of all sequences which are summable with respect to this measure A. This space includes all bounded sequences, and many exponentially growing sequences; in particular, it contains all the feasible growth paths in our economy. Therefore, without loss of generality, we consider the problem of maximizing a welfare function in the space H\, restricted to the set of all feasible growth paths. For this it would suffice to prove that the set of all feasible paths is compact, and the welfare function is continuous on it in the norm of the space H\. However, these conditions are not satisfied: the logarithmic utility function is undefined over certain paths, and the closed bounded subset of H\ which includes all the feasible growth paths, is not closed and therefore not compact. However, we find a closed subset of the space H\ which contains all feasible paths yielding utility values which exceed a minimal level. We prove that this set is compact and that, when restricted to this set, the welfare function is norm continuous. This set contains an optimum of our problem, thus establishing existence of an optimal growth path with endogenous technical change. The techniques utilized here rely on the use of weighted Lp spaces introduced in Chichilnisky [1], [2] and Chichilnisky and Kalman [3].
Holographic Reconstruction and Renormalization in Asymptotically Ricci-flat Spacetimes
Creators: name: Costa, R. N. Caldeira
Publisher: name: arXiv
Year: 2012
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: General Relativity and Quantum Cosmology (gr-qc)
subject: FOS: Physical sciences

description: In this work we elaborate on an extension of the AdS/CFT framework to a subclass of gravitational theories with vanishing cosmological constant. By building on earlier ideas, we construct a correspondence between Ricci-flat spacetimes admitting asymptotically hyperbolic hypersurfaces and a family of conformal field theories on a codimension two manifold at null infinity. By truncating the gravity theory to the pure gravitational sector, we find the most general spacetime asymptotics, renormalize the gravitational action, reproduce the holographic stress tensors and Ward identities of the family of CFTs and show how the asymptotics is mapped to and reconstructed from conformal field theory data. In even dimensions, the holographic Weyl anomalies identify the bulk time coordinate with the spectrum of central charges with characteristic length the bulk Planck length. Consistency with locality in the bulk time direction requires a notion of locality in this spectrum.
description: 44 pages, 4 figures. v2: minor changes in section 5
A Note on Heteroskedasticity Issues
Creators: name: Dhrymes, Phoebus J.
Publisher: name: Columbia University
Year: 1992
Subjects: Economics

description: The purpose of this paper is to clarify certain issues related to the incidence of heteroskadisticity in the General Linear Model (GLM); to provide simpler and more accessible proofs for a number of propositions, and to allow the results to stand under conditions considerably less stringent that those hitherto available in the literature.
การประยุกต์อุปกรณ์รับรู้คลื่นเหนือเสียงกับอินเตอร์เน็ตของสรรพสิ่งสําหรับการทดลองทางฟิสิกส์เรื่องสัมประสิทธิ์ความเสียดทานจลน์
Creators: name: คัชรินทร์ เวชชากุล
Publisher: name: กองบริหารการวิจัย
Year: 2564
Subjects: สัมประสิทธิ์ความเสียดทานจลน์
อุปกรณ์รับรู้คลื่นเหนือเสียง
อินเตอร์เน็ตของสรรพสิ่ง

description: วารสารวิทยาศาสตร์และเทคโนโลยี, 29, 3, 387-402
Supplementary document for Nonlinear Optical Properties of 6H-SiC and 4H-SiC in an Extensive Spectral Range - 5128801.pdf
Creators: name: Guo, Liang
name: Guo, Xiao
name: Peng, Zeyu
name: DING, Pengbo
name: Li, Long
name: Chen, Xinyi
name: Wei, Haoyun
Publisher: name: Optica Publishing Group
Year: 2021
Subjects: Uncategorized

description: Supplement 1 with all supplement content
Thermal Properties of Isotopically Engineered Graphene
Creators: name: Chen, Shanshan
name: Wu, Qingzhi
name: Mishra, Columbia
name: Kang, Junyong
name: Zhang, Hengji
name: Cho, Kyeongjae
name: Cai, Weiwei
name: Balandin, Alexander A.
name: Ruoff, Rodney S.
Publisher: name: arXiv
Year: 2011
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: Materials Science (cond-mat.mtrl-sci)
subject: FOS: Physical sciences

description: In addition to its exotic electronic properties graphene exhibits unusually high intrinsic thermal conductivity. The physics of phonons - the main heat carriers in graphene - was shown to be substantially different in two-dimensional (2D) crystals, such as graphene, than in three-dimensional (3D) graphite. Here, we report our experimental study of the isotope effects on the thermal properties of graphene. Isotopically modified graphene containing various percentages of 13C were synthesized by chemical vapor deposition (CVD). The regions of different isotopic composition were parts of the same graphene sheet to ensure uniformity in material parameters. The thermal conductivity, K, of isotopically pure 12C (0.01% 13C) graphene determined by the optothermal Raman technique, was higher than 4000 W/mK at the measured temperature Tm~320 K, and more than a factor of two higher than the value of K in a graphene sheets composed of a 50%-50% mixture of 12C and 13C. The experimental data agree well with our molecular dynamics (MD) simulations, corrected for the long-wavelength phonon contributions via the Klemens model. The experimental results are expected to stimulate further studies aimed at better understanding of thermal phenomena in 2D crystals.
description: 14 pages, 3 figures
The Optimal Income Tax Schedule
Creators: name: Lancaster, Kelvin
Publisher: name: Columbia University
Year: 1993
Subjects: Economics

description: The principal conclusion of this paper is that the generic pattern for the optimal income tax schedule is that of a monotonically rising marginal tax rate. The belief that the marginal rate should decline to zero at the upper end of the scale is not supported. The results hold for high and low elasticities of labor leisure substitution, and for additive as well as strictly concave welfare functions. Differences between the conclusions of this paper and those of previous writers are due primarily to careful interpretation and analysis of the optimal solution, rather than differences between the models, although these exist.
ปัจจัยส่วนประสมทางการตลาดที่มีผลต่อการเลือกซื้อเครื่องดื่มเพื่อสุขภาพของผู้บริโภคในเขตกรุงเทพมหานคร
Creators: name: อรประภา เทพศิลปวิสุทธิ์
Publisher: name: กองบริหารการวิจัย
Year: 2564
Subjects: การเลือกซื้อสินค้า
เครื่องดื่มเพื่อสุขภาพ
ผู้บริโภค

description: วารสารวิทยาศาสตร์และเทคโนโลยี, 29, 3, 418-430
Precise Determination of Minimum Achievable Temperature for Solid-State Optical Refrigeration
Creators: name: Seletskiy, Denis V.
name: Melgaard, Seth D.
name: Epstein, Richard I.
name: Di Lieto, Alberto
name: Tonelli, Mauro
name: Sheik-Bahae, Mansoor
Publisher: name: arXiv
Year: 2012
Subjects: subject: Materials Science (cond-mat.mtrl-sci)
subject: Atomic Physics (physics.atom-ph)
subject: FOS: Physical sciences

description: We measure the minimum achievable temperature (MAT) as a function of excitation wavelength in anti-Stokes fluorescence cooling of high purity Yb3+-doped LiYF4 (Yb:YLF) crystal. Such measurements were obtained by developing a sensitive noncontact thermometry that is based on a two-band differential luminescence spectroscopy using balanced photo-detectors. These measurements are in excellent agreement with the prediction of the laser cooling model and identify MAT of 110 K at 1020 nm, corresponding to E4-E5 Stark manifold transition in Yb:YLF crystal.
description: 10 pages, 6 figures
Elasto-plastic flow of a foam around an obstacle
Creators: name: Boulogne, François
name: Cox, Simon
Publisher: name: arXiv
Year: 2012
Subjects: subject: Soft Condensed Matter (cond-mat.soft)
subject: Fluid Dynamics (physics.flu-dyn)
subject: FOS: Physical sciences

description: We simulate quasistatic flows of an ideal two-dimensional monodisperse foam around different obstacles, both symmetric and asymmetric, in a channel. We record both pressure and network contributions to the drag and lift forces, and study them as a function of obstacle geometry. We show that the drag force increases linearly with the cross section of an obstacles. The lift on an asymmetric aerofoil-like shape is negative and increases with its arc length, mainly due to the pressure contribution.
Work, free energy and dissipation in voltage driven single-electron transitions
Creators: name: Pekola, J. P.
name: Saira, O. -P.
Publisher: name: arXiv
Year: 2012
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: FOS: Physical sciences

description: We apply the general procedure presented by Jarzynski in [1] to the problem of dissipation in a voltage-driven single-electron box. We obtain the expression of dissipated work, and find its relation to the dissipation Q obtained in [2]. We show that the two quantities are identical in common gate protocols where the system makes a transition for sure.
A Note on Identification Test Procedures
Creators: name: Dhrymes, Phoebus J.
Publisher: name: Columbia University
Year: 1992
Subjects: Economics

description: This paper discusses the meaning of "identification" tests in the context of the General Linear Structural Econometric Model (GLSEM). Its major contribution is to show that, contrary to some implications of the literature, it is not possible to devise independent test for all prior restrictions, and to clarify the meaning of results from such tests.
A (w/o) microemulsion approach for in-situ preparation of high concentrations of colloidal metal oxide nanoparticles
Creators: name: Nassar, Nashaat
Publisher: name: University of Calgary
Year: 2007

description: Bibliography: p. 120-135
description: Control over nanopa1ticle size 1s a key factor which labels a given nanoparticle preparation technique successful. When organic reactions are mediated by ultradispersed catalysts the concentration of the colloidal nanocatalysts and their stability become key factors as well. Ultradispersed metal oxide nanoparticles have applications as heterogeneous catalysts for organic reactions, and were recently demonstrated as effective H2S(gl absorbents. The catalytic activity and absorption effectiveness of metal oxide nanoparticles depend primarily on their surface area, which in turn, is dictated by their size, colloidal concentration and stability. This work presents a water-in-oil (w/o) microemulsion approach for in-situ preparation of ultradispersed metal oxide/hydroxide nanoparticles, namely: iron and copper and discusses the effect of different (w/o) microemulsion variables on their stability and highest possible time-invariant colloidal concentration (nanoparticle uptake). The concentration of the stabilized metal oxides corresponded to the nanoparticle uptake. In-situ preparation of colloidal catalysts and absorbents minimizes aggregation associated with storage and transportation. Much higher surface area per unit mass of nanoparticles and per unit volume of the colloidal suspension than reported in the literature was obtained. The following trends in the colloidal concentration were common for the (w/o) microemulsion system and the heavy oil matrix. An optimum water to surfactant mole ratio, R, was found for which a maximum nanoparticle uptake was obtained. Nanoparticle uptake increased linearly with the surfactant concentration and displayed a power function with the precursor salt concentration. A mathematical model based on correlations for water uptake by Winsor type II microemulsions accurately accounted for the effect of the aforementioned variables on the nanoparticle uptake by the microemulsions. Furthermore, the in-situ microemulsion approach developed in the first part was applied for in-situ preparation of effective H2Scgl colloidal absorbents within heavy oil matrix. H2 Scgl is a by-product of in­situ heavy oil upgrading with potential negative impact on underground water. In this work, preliminarily evaluations of the effectiveness of the in-situ prepared colloidal iron oxide/hydroxide in heavy oil matrix for the absorption of H2 S(gJ was conducted successfully.
The Stellar Population and Star Formation Rates of z~1.5-1.6 [O II] Emitting Galaxies Selected from Narrow-Band Emission-Line Surveys
Creators: name: Ly, Chun
name: Malkan, Matthew A.
name: Kashikawa, Nobunari
name: Hayashi, Masao
name: Nagao, Tohru
name: Shimasaku, Kazuhiro
name: Ota, Kazuaki
name: Ross, Nathaniel R.
Publisher: name: arXiv
Year: 2012
Subjects: subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: FOS: Physical sciences

description: We present the first detailed study of the stellar populations of star-forming galaxies at z~1.5, which are selected by their [O II] emission line, detected in narrow-band surveys. We identified ~1,300 [O II] emitters at z=1.47 and z=1.62 in the Subaru Deep Field with rest-frame EWs above 13Å. Optical and near-infrared spectroscopic observations for ~10% of our samples show that our separation of [O II] from [O III] emission-line galaxies in two-color space is 99% successful. We analyze the multi-wavelength properties of a subset of ~1,200 galaxies with the best photometry. They have average rest-frame EW of 45Å, stellar mass of 3 x 10^9 M_sun, and stellar age of 100 Myr. In addition, our SED fitting and broad-band colors indicate that [O II] emitters span the full range of galaxy populations at z~1.5. We also find that 80% of [O II] emitters are also photometrically classified as "BX/BM" (UV) galaxies and/or the star-forming "BzK" (near-IR) galaxies. Our [O II] emission line survey produces a far more complete, and somewhat deeper sample of z~1.5 galaxies than either the BX/BM or sBzK selection alone. We constructed average SEDs and find that higher [O II] EW galaxies have somewhat bluer continua. SED model-fitting shows that they have on average half the stellar mass of galaxies with lower [O II] EW. The observed [O II] luminosity is well-correlated with the far-UV continuum with a logarithmic slope slightly 0f 0.89\pm0.22. The scatter of the [O II] luminosity against the far-UV continuum suggests that [O II] can be used as a SFR indicator with a reliability of 0.23 dex.
description: 14 pages (emulateapj), 14 figures, 2 tables. Accepted for publication in the Astrophysical Journal. Minor revisions in response to the referee
Immunization with live, virulence-attenuated Listeria monocytogenes provides newborn mice with long-term protection against asthma
Creators: name: Segeritz, Charis-Patricia
Publisher: name: University of British Columbia
Year: 2012

description: Asthma is a chronic respiratory disorder that leads to inflammation and narrowing of the airways. The global prevalence, morbidity, mortality and economic cost associated with asthma have been on the rise since the 1960’s and continue to increase dramatically by 50% every decade. Today, over 300 million people across all ages, genders and ethnic backgrounds suffer from asthma. In short, asthma has reached epidemic levels. Current treatment options either alleviate symptoms only temporarily, burden the asthmatic with life-long controller medication, or rely on environmental control measures. Children are disproportionally affected by asthma, indicating that asthma most often is initiated early in life. A vaccination strategy able to prevent or cure asthma early in life is therefore urgently needed. We have successfully developed a novel vaccine platform based on the live, attenuated, intracellular bacterium Listeria monocytogenes. We hypothesized that this vaccine platform would induce a sustained anti-allergic Th1 immune response after only one dose given to newborn mice, thus preventing asthma upon future challenge with the allergen. To test our hypothesis, neonatal mice immunized intraperitoneally with different Listeria monocytogenes vaccine strains were compared to negative and positive controls. We examined the protective effects of the following vaccines: the live vaccine strain Lm (trpS actA)/pSPOPShlyOVA, synthesizing ovalbumin proteins, 2) the same yet heatkilled vaccine strain HKLm (trpS actA)/pSPO-PShlyOVA and 3) the live vaccine strain Lm (trpS actA)/pSPO expressing no specific antigens. Subsequent sensitization and intranasal challenge with ovalbumin to induce asthma was followed by a detailed analysis of asthma severity. This analysis included the total number and types of cells in the bronchoalveolar lavage fluid, as well as histology of lung tissue identifying goblet cell metaplasia and cell infiltration of the airway epithelium. Serum antibody levels and cytokine profiles were also examined, as was airway resistance. We found that only neonatal mice immunized with the live Listeria monocytogenes strains were protected from asthma. This protection did not appear to be mediated by shifts in the Th1/Th2 responses and was found even in the absence of specific antigen expression by Listeria monocytogenes.
Strengthening reinforced concrete beams with prestressed near surface mounted fibre reinforced polymers
Creators: name: Gaafar, Mohamed
Publisher: name: University of Calgary
Year: 2007

description: Bibliography: p. 188-193
description: The work done in this thesis investigates the effect of usrng an innovative anchorage/prestressing system that is capable of strengthening concrete beams using prestressed Near-Surface-Mounted (NSM) technique. The effect of the newly developed prestressing system on the behaviour of the concrete beams under various prestressing levels was studied. The developed system proved to be an easy and practical method to prestress the NSM CFRP reinforcement. Two types of Carbon Fibre Reinforced Polymers (CFRP) profiles (rebar and strips) were used in the tests. A total of nine beams were tested, one beam was considered unstrengthened control beam for the comparison purpose, the other eight beams were classified into two groups each contains four beams. The first group was strengthened with two CFRP strips while the second group was strengthened with one CFRP rebar. Beams in each group were prestressed into various pres tressing levels (0%, 20%, 40% and 60%) of the ultimate tensile strength of the CFRP material. Results showed that all beams strengthened with prestressed CFRP failed due to rupture in the FRP without any premature failure gaining an increase in the ultimate capacity up to 68% compared to the unstrengthened control beam. In addition, the deflection of the beams decreased while the cracking and the yielding loads increased significantly due to prestressing effect. This shows the effectiveness of the contribution of the new prestressing system with reinforced concrete beams strengthened FRP NSM technique.
ปรสิตของปลาไหลนาจากคลองบางโหนด อําเภอหาดใหญ่ จังหวัดสงขลา
Creators: name: วิจิตรา ตุ้งซี่
Publisher: name: กองบริหารการวิจัย
Year: 2564
Subjects: ปรสิต, ปลาไหลนา, จังหวัดสงขลา

description: วารสารวิทยาศาสตร์และเทคโนโลยี, 29, 3, 431-440
ผลของการเคลือบเมล็ดด้วยMetalaxyl, Captanและ Mancozebหลังผ่านการทําไพรม์มิ่งต่อความงอกและการเจริญเติบโตของต้นกล้าข้าวโพดเลี้ยงสัตว์
Creators: name: จักรพงษ์ กางโสภา
Publisher: name: กองบริหารการวิจัย
Year: 2564
Subjects: การยกระดับคุณภาพเมล็ดพันธุ์
การไพรม์เมล็ดพันธุ์
คุณภาพเมล็ดพันธุ์
สารเคมีป้องกันรา

description: วารสารวิทยาศาสตร์และเทคโนโลยี, 29, 3, 441-453