cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
Field theory of bi- and tetracritical points: Relaxational dynamics
Creators: name: Folk, R.
name: Holovatch, Yu.
name: Moser, G.
Publisher: name: arXiv
Year: 2008
Subjects: subject: Statistical Mechanics (cond-mat.stat-mech)
subject: FOS: Physical sciences

description: We calculate the relaxational dynamical critical behavior of systems of $O(n_\|)\oplus O(n_\perp)$ symmetry by renormalization group method within the minimal subtraction scheme in two loop order. The three different bicritical static universality classes previously found for such systems correspond to three different dynamical universality classes within the static borderlines. The Heisenberg and the biconical fixed point lead to strong dynamic scaling whereas in the region of stability of the decoupled fixed point weak dynamic scaling holds. Due to the neighborhood of the stability border between the strong and the weak scaling dynamic fixed point corresponding to the static biconical and the decoupled fixed point a very small dynamic transient exponent, of $ω_v^{\cal B}=0.0044$, is present in the dynamics for the physically important case $n_\|=1$ and $n_\perp=2$ in $d=3$.
description: 8 figures
Treating divergence in quark matter by using energy projectors
Creators: name: Huang, Guojun
name: Zhuang, Pengfei
Publisher: name: arXiv
Year: 2021
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: Nuclear Theory (nucl-th)
subject: FOS: Physical sciences

description: We calculate gluon self-energy using quark energy projectors in a general quark-gluon plasma. By separating the quark field into a positive- and a negative-energy mode, the quark loop constructed with the same mode is always convergent, and the divergence appears only in the mixed loop with different modes and is medium independent. After removing the divergence in vacuum, we obtain the one-loop gluon self-energy at finite temperature, chemical potential and quarks mass without approximation. With the method of quark loop resummation, we calculate non-perturbatively the gluon Debye mass and thermodynamic potential. In the limit of small gluon momentum in comparison with temperature, chemical potential and quark mass, our calculation comes back to the known HTL/HDL results in literature.
description: 10 pages, 2 figures
On discrete features of the wave equation in singular pp-wave backgrounds
Creators: name: Evnin, Oleg
name: Nguyen, Timothy
Publisher: name: arXiv
Year: 2008
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: General Relativity and Quantum Cosmology (gr-qc)
subject: FOS: Physical sciences

description: We analyze the wave equation in families of pp-wave geometries developing strong localized scale-invariant singularities in certain limits. For both cases of well-localized pp-waves and the so-called null-cosmologies, we observe an intriguing discrete dependence of the existence of a singular limit on the normalization of the pp-wave profile. We also find restrictive matching conditions relating the geometries before and after the singularity (if a singular limit for the solutions of the wave equation with initial conditions specified away from the near-singular region is assumed to exist).
description: 10 pages; v2: references and clarifications added, minor typos corrected
Nudge: Stochastically Improving upon FCFS
Creators: name: Grosof, Isaac
name: Yang, Kunhe
name: Scully, Ziv
name: Harchol-Balter, Mor
Publisher: name: arXiv
Year: 2021
Subjects: subject: Performance (cs.PF)
subject: Probability (math.PR)
subject: FOS: Computer and information sciences
subject: FOS: Mathematics

description: The First-Come First-Served (FCFS) scheduling policy is the most popular scheduling algorithm used in practice. Furthermore, its usage is theoretically validated: for light-tailed job size distributions, FCFS has weakly optimal asymptotic tail of response time. But what if we don't just care about the asymptotic tail? What if we also care about the 99th percentile of response time, or the fraction of jobs that complete in under one second? Is FCFS still best? Outside of the asymptotic regime, only loose bounds on the tail of FCFS are known, and optimality is completely open. In this paper, we introduce a new policy, Nudge, which is the first policy to provably stochastically improve upon FCFS. We prove that Nudge simultaneously improves upon FCFS at every point along the tail, for light-tailed job size distributions. As a result, Nudge outperforms FCFS for every moment and every percentile of response time. Moreover, Nudge provides a multiplicative improvement over FCFS in the asymptotic tail. This resolves a long-standing open problem by showing that, counter to previous conjecture, FCFS is not strongly asymptotically optimal.
description: 29 pages, 4 figures. To appear in SIGMETRICS 2021
Cell-Free Massive MIMO-OFDM Transmission over Frequency-Selective Fading Channels
Creators: name: Jiang, Wei
name: Schotten, Hans Dieter
Publisher: name: arXiv
Year: 2021
Subjects: subject: Information Theory (cs.IT)
subject: Signal Processing (eess.SP)
subject: FOS: Computer and information sciences
subject: FOS: Electrical engineering, electronic engineering, information engineering

description: This letter presents and analyzes orthogonal frequency-division multiplexing (OFDM)-based multi-carrier transmission for cell-free massive multi-input multi-output (CFmMIMO) over frequency-selective fading channels. Frequency-domain conjugate beamforming, pilot assignment, and user-specific resource allocation are proposed. CFmMIMO-OFDM is scalable to serve a massive number of users and is flexible to offer diverse data rates for heterogeneous applications.
Some aspects of Ricci flow on the 4-sphere
Creators: name: Chang, Sun-Yung Alice
name: Chen, Eric
Publisher: name: arXiv
Year: 2021
Subjects: subject: Differential Geometry (math.DG)
subject: Analysis of PDEs (math.AP)
subject: FOS: Mathematics
subject: 53C21, 53E20

description: In this paper, on 4-spheres equipped with Riemannian metrics we study some integral conformal invariants, the sign and size of which under Ricci flow characterize the standard 4-sphere. We obtain a conformal gap theorem, and for Yamabe metrics of positive scalar curvature with $L^2$ norm of the Weyl tensor of the metric suitably small, we establish the monotonic decay of the $L^p$ norm for certain $p>2$ of the reduced curvature tensor along the normalized Ricci flow, with the metric converging exponentially to the standard 4-sphere.
description: To appear in the Vaughan Jones Memorial Volume of the NZJM
title: Antología especial
Creators: name: Luis, Contreras Jara
name: Contreras Jara, Luis
Publisher: name: NAKALA - https://nakala.fr (Huma-Num - CNRS)
Year: 2023
Subjects: Écrit de prison
Poésie

description: Description : - Illustration : dessin colorié de tête de femme stylisé. - Titre / Auteur : 'Antología especial' - Luis Contreras J. In (Image numérique) 001.
- [Y va así, de puerta en puerta] : poème de Luis Contreras Jara, Dec. 1973. In 003.
description: Notes : Document incomplet. Illustrations (dessins) aux feutres de couleur : orange, rouge, vert et bleu. Pages non numérotées.
BOSHLANGʻICH ILDIZLAR. PA VA P2A MODUL BOʻYICHA BOSHLANGʻCH INDEKISLAR
Creators: name: Zaxriddinova, Shaxlo
name: Toʻrayeva, Charos
Publisher: name: Zenodo
Year: 2025

description: Ushbu maqolada Pa va P2a moduli boʻyicha boshlangʻich ildizlar va indekslar tushunchasi tadqiq qilinadi. Boshlangʻich ildizlarning matematik asoslari, ularning mavjudlik shartlari va xususiyatlari koʻrib chiqiladi. Shuningdek, Pa va P2a moduli bo‘yicha indekslash usullari va ularning qo‘llanilish imkoniyatlari tahlil qilinadi. Modulli arifmetika, kriptografiya va algoritmik optimallashtirishdagi amaliy qo‘llanilishi haqida muhokama qilinadi. Maqolada boshlangʻich ildizlarni topish va indekslarni hisoblash algoritmlari ham bayon etiladi.
Random circuits by measurements on weighted graph states
Creators: name: Plato, A. Douglas K.
name: Dahlsten, Oscar C.
name: Plenio, Martin B.
Publisher: name: arXiv
Year: 2008
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: Random quantum circuits take an input quantum state and randomize it. This is a task with a growing number of identified uses in quantum information processing. We suggest a scheme to implement random circuits in a weighted graph state. The input state is entangled with the weighted graph state and a random circuit is implemented when the experimenter performs local measurements in one fixed basis only. The scheme uses no classical random numbers and is a new and natural application of weighted graph states
description: 8 pages, 5 figures
title:  The Soma and the City: A Critical Approach
Creators: name: Makky  ,  Lukáš
Publisher: name: Roma TrE-Press
Year: 2021

description: This paper deals with urban aesthetics as one of the main research fields in contemporary aesthetics, placing particular emphasis on the recipient’s aesthetic experience of the city. The overall aim is to discuss the kind of aesthetic interactions we have when immersed in a city. Somaesthetic experience (Shusterman 1999) represents the core notion in this survey and establishes the discussion about the role of body sensations in the process of experiencing the city. The attempt is to underline the virtues and limits of a somaesthetic approach when applied to the case of the city. One of the main outcomes is the claim that the body, as an instrument for experiencing the city, is insufficient. Cognition, knowledge, context, and information are necessary for a more intense and richer experience of the city.
description: Everydayness. Contemporary Aesthetic Approaches
A lake classification system : a tool for lake planning in the Thompson-Nicola regional district, British Columbia
Creators: name: Chess, Joan
Publisher: name: University of British Columbia
Year: 2010

description: The goals of the thesis are: 1) to develop a lake classification system for use in planning for regional patterns of lake development; it is presented as one element within a framework for the analysis and allocation of the lake resource to various demands, focusing upon recreational use; 2) to illustrate the application of the lake classification system, to a selection of lakes in the Thompson-Nicola Regional District, British Columbia (TNRD, B.C.). For the purposes of the thesis, lake system planning is defined as that process of systematic analyses and allocation of the lake resource to various competing demands, on a regional scale. One potentially useful step in lake system planning is the application of a lake classification system. The resource method was organized around three parts: 1) a review and critique of existing lake planning methods, focusing upon those taking a regional approach and using a classification scheme; 2) the descriptive elements of the lake resource important to planning; and 3) the demands for the lake resource in the study region. B.C.'s south-central area has hundreds of lakes, some of which are being used for irrigation, salmon rearing habitat, transportation, sewage disposal, domestic supply, tourism, and/or recreation. Some of these uses are increasing annually, creating greater pressures upon the lake resource. Further, the resource itself is a complex system consisting of many interacting, interdependent elements. Thus two factors indicate the need for lake planning and management; 1) the limited supply of the resource and its complex nature; and 2) the demands to use lakes for a variety of purposes, some of which compete and conflict with each other. A lake planning framework can help to achieve a balance between the supply of and the demand for lakes, by manipulating either the supply or the demand, or both. The development of a complete lake system planning process is beyond the scope of this thesis. Therefore it focuses on a classification system as a potentially useful tool within the lake planning process. The proposed classification scheme consists of the following classes: I. Wilderness Lakes, II. Natural Environment Lakes. III. General Use Lakes and Subclass-Developed Lakes, IV. Development Lakes and Subclass-Intensive Use Lakes, and V. Special Case Lakes. The objective, definition, criteria, standards, and recommended management guidelines are presented for each class. Finally, some lakes in the TNRD are used to illustrate the application of the lake classification system.
Entanglement spectrum in one-dimensional systems
Creators: name: Calabrese, Pasquale
name: Lefevre, Alexandre
Publisher: name: arXiv
Year: 2008
Subjects: subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: Statistical Mechanics (cond-mat.stat-mech)
subject: High Energy Physics - Theory (hep-th)
subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: We derive the distribution of eigenvalues of the reduced density matrix of a block of length l in a one-dimensional system in the scaling regime. The resulting "entanglement spectrum" is described by a universal scaling function depending only on the central charge of the underlying conformal field theory. This prediction is checked against exact results for the XX chain. We also show how the entanglement gap closes when l is large.
description: 4 pages, 3 figures, typos corrected, Refs added
Molecular orientation entanglement and temporal Bell-type inequalities
Creators: name: Milman, P.
name: Keller, A.
name: Charron, E.
name: Atabek, O.
Publisher: name: arXiv
Year: 2008
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: We detail and extend the results of [Milman {\it et al.}, Phys. Rev. Lett. {\bf 99}, 130405 (2007)] on Bell-type inequalities based on correlations between measurements of continuous observables performed on trapped molecular systems. We show that for some observables with a continuous spectrum which is bounded, one is able to construct non-locality tests sharing common properties with those for two-level systems. The specific observable studied here is molecular spatial orientation, and it can be experimentally measured for single molecules, as required in our protocol. We also provide some useful general properties of the derived inequalities and study their robustness to noise. Finally, we detail possible experimental scenarii and analyze the role played by different experimental parameters.
description: 10 pages and 5 figures
Open Science Skills Workshop for the Association for Environmental Archaeology
Creators: name: Karoune, Emma
name: Leggett, Sam
name: Park, Gayoung
name: Wang, Li-Ying
Publisher: name: Zenodo
Year: 2021
Subjects: Open Science
Archaeology
Open data
Open methods
Open source software
Open access
Software Sustainability Institute

description: These are the presentation slides and resource document used for the Open Science Skills Workshop at the autumn 2021 event for the Association for Environmental Archaeology (AEA). The presentations include all aspects of open science (Written by and speaker for the presentation in brackets): Open Science - What is it all about? (Emma Karoune) Open data (Li-Ying Wang) Open Method (Sam Leggett) Open Analysis (Gayoung Park) Open Access Publishing (Emma Karoune) Videos of the presentation will be uploaded shortly on the AEA YouTube channel. This event was organised by Emma Karoune as part of her Software Sustainability Institute Fellowship.
What truncates star formation in early massive galaxies?  New insights revealed about their cold ISM using ALMA
Creators: name: Williams, Christina
Publisher: name: Zenodo
Year: 2023

description: Quiescent galaxies are the massive remnants of both rapid star-formation in the early Universe, and powerful feedback mechanisms that may truncate star-formation. Understanding these "quenching" processes has been a major challenge to building a complete picture of galaxy evolution. I will overview recent results based on ALMA data that seek to characterize the cold ISM of massive quiescent galaxies in the distant Universe, during the first few billion years after the Big Bang. ALMA is revealing an emerging picture of a diversity of evolutionary pathways among galaxies that are ceasing their star-formation at this early epoch, which our theoretical formulations of quenching processes must accommodate. Looking forward, I will discuss future directions where ALMA can further our understanding in its second decade.
title:  Food: An Ordinary Practice or an Extraordinary Experience?
Creators: name: Di Stefano ,  Elisabetta
Publisher: name: Roma TrE-Press
Year: 2021

description: Food and the practice of cooking hold a privileged place in contemporary aesthetics, as attested by the extensive literature that has been devoted to this topic. Food has been addressed in both Anglo-American and European studies from multiple points of view, including a cognitivist, pragmatist, phenomenological, everyday and somaesthetic perspective. In this essay I will try to identify a path that allows us to hold together these readings through the ordinary-extraordinary dichotomy. First, I shall analyze food through the lens of the extraordinary, taking into consideration some examples in which food is presented as a true work of art in museums or as an exceptional experience in increasingly aestheticized daily life. Then, using the key of the ordinary, I will consider food preparation and consumption as routine practices. Finally, I will make an attempt to reconcile the two categories by identifying the moments in which the extraordinary manifests itself in everyday life.
description: Everydayness. Contemporary Aesthetic Approaches
MPEC 2025-G42 : 2025 FB22
Creators: name: Minor Planet Center Staff
Publisher: name: The Minor Planet Center
Year: 2025
Subjects: subject: Small Solar System bodies
valueUri: http://astrothesaurus.org/uat/1469
subject: 2025 FB22

description: The Minor Planet Electronic Circulars contain information on unusual minor planets, routine data on comets and natural satellites, and occasional editorial announcements.  They are published on behalf of Division F of the International Astronomical Union by the Minor Planet Center, Smithsonian Astrophysical Observatory, Cambridge, MA 02138, U.S.A.
Berezin-Toeplitz quantization on Lie groups
Creators: name: Hall, Brian C.
Publisher: name: arXiv
Year: 2008
Subjects: subject: Mathematical Physics (math-ph)
subject: FOS: Physical sciences
subject: 81S10, 22E30

description: Let K be a connected compact semisimple Lie group and Kc its complexification. The generalized Segal-Bargmann space for Kc, is a space of square-integrable holomorphic functions on Kc, with respect to a K-invariant heat kernel measure. This space is connected to the "Schrodinger" Hilbert space L^2(K) by a unitary map, the generalized Segal-Bargmann transform. This paper considers certain natural operators on L^2(K), namely multiplication operators and differential operators, conjugated by the generalized Segal-Bargmann transform. The main results show that the resulting operators on the generalized Segal-Bargmann space can be represented as Toeplitz operators. The symbols of these Toeplitz operators are expressed in terms of a certain subelliptic heat kernel on Kc. I also examine some of the results from an infinite-dimensional point of view based on the work of L. Gross and P. Malliavin.
description: To appear in Journal of Functional Analysis
Identifying critical residues in protein folding: Insights from phi-value and Pfold analysis
Creators: name: Faisca, P. F. N.
name: Travasso, R. D. M.
name: Ball, R. C.
name: Shakhnovich, E. I.
Publisher: name: arXiv
Year: 2008
Subjects: subject: Biomolecules (q-bio.BM)
subject: FOS: Biological sciences

description: We apply a simulational proxy of the phi-value analysis and perform extensive mutagenesis experiments to identify the nucleating residues in the folding reactions of two small lattice Go polymers with different native geometries. These results are compared with those obtained from an accurate analysis based on the reaction coordinate folding probability Pfold, and on structural clustering methods. For both protein models, the transition state ensemble is rather heterogeneous and splits-up into structurally different populations. For the more complex geometry the identified subpopulations are actually structurally disjoint. For the less complex native geometry we found a broad transition state with microscopic heterogeneity. For both geometries, the identification of the folding nucleus via the Pfold analysis agrees with the identification of the folding nucleus carried out with the phi-value analysis. For the most complex geometry, however, the apllied methodologies give more consistent results than for the more local geometry. The study of the transition state' structure reveals that the nucleus residues are not necessarily fully native in the transition state. Indeed, it is only for the more complex geometry that two of the five critical residues show a considerably high probability of having all its native bonds formed in the transition state. Therefore, one concludes that in general the phi-value correlates with the acceleration/deceleration of folding induced by mutation, rather than with the degree of nativeness of the transition state, and that the traditional interpretation of phi-values may provide a more realistic picture of the structure of the transition state only for more complex native geometries.
description: Submitted for publication with minor changes (abstract & higher resolution figures)
Designing a Change-Driven Language for Model Consistency Repair Routines
Creators: name: Klare, Heiko
Publisher: name: Karlsruher Institut für Technologie (KIT)
Year: 2016
Subjects: software engineering
software evolution
model-driven software development
model consistency
change-driven model synchronization
model repair
consistency preservation

description: Ein Software-System kann während der Entwicklung durch verschiedene Modelle beschrieben werden, um unterschiedliche Teile oder Abstraktionen des Systems darzustellen. Diese Modelle können voneinander abhängige oder sogar redundante Informationen enthalten. Wenn ein Softwareentwickler an solchen Modellen Änderungen vornimmt ohne diese Abhängigkeiten zu beachten, können die Modelle inkonsistent werden. Ein Entwickler ist kaum in der Lage einen Überblick über alle Modelle eines Entwicklungsprozesses und deren Abhängigkeiten zu behalten. Daher sind automatisierte Verfahren zur Wiederherstellung von Konsistenz nach Modelländerungen notwendig. Existierende Methoden erlauben die deklarative Spezifikation von Abhängigkeiten zwischen Modellen, aus denen automatisiert Mechanismen zur Konsistenzerhaltung abgeleitet werden. Diese Ansätze sind in ihrer Ausdrucksmächtigkeit beschränkt und bieten nur eingeschränkten Einfluss auf die Art und Weise in der Konsistenz wiederhergestellt wird. Sie legen automatisiert eine Art der Wiederherstellung der Konsistenz fest, obwohl es verschiedene Möglichkeiten dafür gäbe. In dieser Arbeit stellen wir die änderungsgetriebene Response-Sprache für die Konsistenzerhaltung von Modellen vor. Sie erlaubt es, die Art und Weise der Wiederherstellung von Konsistenz explizit in imperativen Programmen festzulegen, welche als Reaktion auf festgelegte Änderungen ausgeführt werden. Zusätzlich bietet sie Sprachkonstrukte an, die wiederkehrende Reaktionen kapseln und wiederverwendbar machen. Wir führen einen Konsistenzbegriff mit dem Fokus auf Verständlichkeit ein und stellen eine Kategorisierung von möglichen Modelländerungen vor. Die Sprache ist entsprechend einer allgemeingültigen Struktur für die änderungsgetriebene Wiederherstellung von Konsistenz aufgebaut, welche wir aus unserem Konsistenzbegriff herleiten. Wir stellen eine Evaluation unseres Ansatzes anhand einer Fallstudie zur Konsistenzerhaltung von Architekturbeschreibungen und deren Implementierung in objektorientiertem Code vor. Die Evaluation zeigt die Anwendbarkeit der vorgestellten Sprache für die Sicherstellung von Modellkonsistenz in diesem konkreten Fall und verdeutlicht einige Vorteile gegenüber einer manuellen Implementierung der Mechanismen zur Konsistenzerhaltung.
Online Appendix
Creators: name: Sahin, Taylan
Publisher: name: figshare
Year: 2022
Subjects: subject: 100510 Wireless Communications
subject: FOS: Electrical engineering, electronic engineering, information engineering

description: Online Appendix (Not for Publication) to Paper “Scheduling Out-of-Coverage Vehicular Communications Using Reinforcement Learning” by Taylan Şahin, Ramin Khalili, Mate Boban, and Adam Wolisz
Pengembangan Metode Numerik dan Eksperimen Sistem Struktur Penguatan Inovasi
Creators: name: Permana
name: Kresnadian Tedjawinata, Galuh
Publisher: name: Lembaga Pengembangan Inovasi dan Kewirausahaan ITB (LPIK/ DKST-ITB)
Year: 2025

description: Riset ini mengembangkan metode numerik dan eksperimen untuk sistem struktur pada arsitektur blok kayu modular, yang memiliki potensi besar untuk komersialisasi dan hilirisasi. Bangunan modular yang dihasilkan telah melewati tahap pembuatan prototipe dan mendapatkan pengakuan baik di tingkat nasional maupun internasional. Inovasi ini merevolusi proses pembangunan rumah dengan sistem knockdown, memungkinkan pengadaan rumah yang cepat, murah, dan efisien, sekaligus berkontribusi dalam mengatasi backlog perumahan di Indonesia serta permasalahan infrastruktur pasca bencana.

Dalam riset ini, bahasa pemrograman C# dan Visual Basic (VB) memainkan peran kunci. C# digunakan untuk pengembangan aplikasi simulasi dan perhitungan struktur modular, sementara VB berfungsi dalam pembuatan antarmuka yang ramah pengguna untuk mempermudah input data serta menghasilkan perhitungan yang lebih akurat. Kombinasi kedua bahasa ini memungkinkan analisis numerik yang efisien dan andal, sehingga meningkatkan performansi penelitian. Inovasi ini sangat relevan dalam penyediaan hunian permanen pasca bencana dan mendukung produksi massal melalui penguatan metode numerik dan eksperimen.
title: Robustness of estimation based on empirical transforms
Creators: name: Campbell, Edward
Publisher: name: University of Kent
Year: 2021

description: The robustness of certain model-fitting procedures, based on statistical transforms, is investigated using the Influence Function. Our discussion is in two parts. In the first, we focus on estimateing the parameters of particular distributions, given independent and identically distributed realizations. We then move on, in the second part, to discuss the fitting of stochastic models. In this latter context the approach baesd on transforms, such as the Laplace transform, offers the possibility of explicit parameter estimation. This is in obvious contrast to the more usual situation where only a numerical solution is possible. It was shown by Kemp & Kemp (1987), in a two-parameter example, that only a one-dimensional search was required to produce well-defined estimators. This phenomenon was noted earlier by Morgan (1982), and provides further motivation for transform methods. We generalize the result, and provide an example where a three-dimensional search can be reduced to a line search. With this in mind, we consider the fitting of stochastic models in some detail, employing the standard technique of ordinary least-squares as a bench-mark in this work. The central theme of this thesis is, however, the robustness of such methods. To this end, we develop a powerful and flexible influence theory in the context of non-indexed random variables. These developments allow us to make concrete statements about the robustness of procedures based on transforms. We show that an analogous treatment is possible for the indexed case, allowing useful qualitative information about parameter estimators to be gathered.
Dimer-dimer collisions at finite energies in two-component Fermi gases
Creators: name: D'Incao, J. P.
name: Rittenhouse, Seth T.
name: Mehta, N. P.
name: Greene, Chris H.
Publisher: name: arXiv
Year: 2008
Subjects: subject: Atomic Physics (physics.atom-ph)
subject: FOS: Physical sciences

description: We introduce a major theoretical generalization of existing techniques for handling the three-body problem that accurately describes the interactions among four fermionic atoms. Application to a two-component Fermi gas accurately determines dimer-dimer scattering parameters at finite energies and can give deeper insight into the corresponding many-body phenomena. To account for finite temperature effects, we calculate the energy-dependent complex dimer-dimer scattering length, which includes contributions from elastic and inelastic collisions. Our results indicate that strong finite-energy effects and dimer dissociation are crucial for understanding the physics in the strongly interacting regime for typical experimental conditions. While our results for dimer-dimer relaxation are consistent with experiment, they confirm only partially a previously published theoretical result.
description: 4.1 pages, 3 figures, revised text. Supplemental material provided: 2 pages, 2 figures
Lorentz transformations with arbitrary line of motion
Creators: name: Iyer, Chandru
name: Prabhu, G. M.
Publisher: name: arXiv
Year: 2008
Subjects: subject: General Physics (physics.gen-ph)
subject: FOS: Physical sciences

description: Sometimes it becomes a matter of natural choice for an observer (A) that he prefers a coordinate system of two-dimensional spatial x-y coordinates from which he observes another observer (B) who is moving at a uniform speed along a line of motion, which is not collinear with As chosen x or y axis. It becomes necessary in such cases to develop Lorentz transformations where the line of motion is not aligned with either the x or the y-axis. In this paper we develop these transformations and show that under such transformations, two orthogonal systems (in their respective frames) appear non-orthogonal to each other. We also illustrate the usefulness of the transformation by applying it to three problems including the rod-slot problem. The derivation has been done before using vector algebra. Such derivations assume that the axes of K and K-prime are parallel. Our method uses matrix algebra and shows that the axes of K and K-prime do not remain parallel, and in fact K and K-prime which are properly orthogonal are observed to be non-orthogonal by K-prime and K respectively. http://www.iop.org/EJ/abstract/0143-0807/28/2/004
description: 11 pages and an appendix. Published in European Journal of Physics (2007) Eur J. Phys. 28 (2007) pp183-190
Milk and dairy products: evaluation of bioactive components by analytical techniques
Creators: name: Guerra, Elena <1984>
Publisher: name: Alma Mater Studiorum - Università di Bologna
Year: 2014
Subjects: AGR/15 Scienze e tecnologie alimentari

description: Milk and dairy products are important source of bioactive compounds useful to satisfy the nutritional and physiological needs of any newborns of mammalian species and useful to guarantee adequate growth and development of infants as well as provide a complete nourishment of adults. Physico-chemical, nutritional and organoleptic properties of the main constituents and the “minor” components have a crucial role in the quality of milk and milk products. Although in the past decades dietary milk fat was often regarded as harmful for the human health, recent researches suggest that milk contains specific fatty acids with nutritional and physiological health benefits. For these reasons, a major attention is given to the quantity and quality of total fat intake. In the recent years, as a result of the new concept of multifunctional agriculture and the changing behaviours about diet, consumer demands in favor of high-quality, security and safety dairy products are increased. Moreover, milk proteins and milk-derived bioactive peptides are recognized to have a high nutritive value, several health-promoting functional activities and excellent technological properties. Accordingly, growing interest in the development of functional dairy products and preparation of infant formulae for babies who cannot be breast-fed, has been give in order to meet the specific consumer’s requests. This manuscript presents the main results obtained during my PhD research aimed to evaluate the main bioactive lipids and proteins in milk and dairy products using innovative analytical techniques. The experimental section of this manuscript is divided in two sections where are reported the main results obtained during my research activities on dairy products and human milks in order to characterize their bioactive compounds for functional food applications.
Sustainable processes using heterogeneous acid catalysts. Some examples of industrial interest.
Creators: name: Gliozzi, Gherardo <1986>
Publisher: name: Alma Mater Studiorum - Università di Bologna
Year: 2014
Subjects: CHIM/04 Chimica industriale

description: In recent years the need for the design of more sustainable processes and the development of alternative reaction routes to reduce the environmental impact of the chemical industry has gained vital importance. Main objectives especially regard the use of renewable raw materials, the exploitation of alternative energy sources, the design of inherently safe processes and of integrated reaction/separation technologies (e.g. microreactors and membranes), the process intensification, the reduction of waste and the development of new catalytic pathways. 
The present PhD thesis reports results derived during a three years research period at the School of Chemical Sciences of Alma Mater Studiorum-University of Bologna, Dept. of Industrial Chemistry and Materials (now Dept. of Industrial Chemistry “Toso Montanari”), under the supervision of Prof. Fabrizio Cavani (Catalytic Processes Development Group). Three research projects in the field of heterogeneous acid catalysis focused on potential industrial applications were carried out.
The main project, regarding the conversion of lignocellulosic materials to produce monosaccharides (important intermediates for production of biofuels and bioplatform molecules) was financed and carried out in collaboration with the Italian oil company eni S.p.A. (Istituto eni Donegani-Research Center for non-Conventional Energies, Novara, Italy)
The second and third academic projects dealt with the development of green chemical processes for fine chemicals manufacturing. In particular, (a) the condensation reaction between acetone and ammonia to give triacetoneamine (TAA), and (b) the Friedel-Crafts acylation of phenol with benzoic acid  were investigated.
Coexistence of Long-Range Magnetic Order and Superconductivity from Campbell Penetration Depth Measurements
Creators: name: Prozorov, R.
name: Vannette, M. D.
name: Gordon, R. T.
name: Martin, C.
name: Bud'ko, S. L.
name: Canfield, P. C.
Publisher: name: arXiv
Year: 2008
Subjects: subject: Superconductivity (cond-mat.supr-con)
subject: FOS: Physical sciences

description: Application of a tunnel-diode resonator (TDR) technique for studies of the vortex response in magnetic superconductors is described. Operating at very small excitation fields and sufficiently high frequency, TDR was used to probe small-amplitude linear AC response in several types of single crystals where long-range magnetic order coexists with bulk superconductivity. Full local - moment ferromagnetism destroys superconductivity and can coexist with it only in a narrow temperature range ($\sim 0.3$ K). In contrast, weak ferromagnetic as well as antiferromagnetic orders can coexist with bulk superconductivity and may even lead to enhancements of vortex pinning. By analyzing the Campbell penetration depth we find sharp increase of the true critical current in the vicinity of the magnetic phase transitions. We conclude that critical magnetic fluctuations are responsible for this enhancement.
Investigating the Potential for Avian Pest Control in Pastures: A Mutualistic Approach to Conservation
Creators: name: Chapman, Jessica
Publisher: name: La Trobe
Year: 2025
Subjects: classificationCode: 410401
subject: Conservation and biodiversity
classificationCode: 410404
subject: Environmental management
classificationCode: 300202
subject: Agricultural land management
classificationCode: 310308
subject: Terrestrial ecology

description: Submitted in total fulfilment for the requirements for the degree of Master of Science to the School of Agriculture, Biomedicine, and Environment, La Trobe University, Victoria, Australia.
A B-spline Galerkin method for the Dirac equation
Creators: name: Fischer, Charlotte Froese
name: Zatsarinny, Oleg
Publisher: name: arXiv
Year: 2008
Subjects: subject: Atomic Physics (physics.atom-ph)
subject: FOS: Physical sciences

description: The B-spline Galerkin method is investigated for the simple eigenvalue problem, $y^{\prime\prime} = -λ^2 y$. Special attention is give to boundary conditions. From this analysis, we propose a stable method for the Dirac equation and evaluate its accuracy by comparing the computed and exact R-matrix for a wide range of nuclear charges $Z$ and angular quantum numbers $κ$. No spurious solutions were found and excellent agreement was obtained for the R-matrix.
description: PDFTex, 5 pages and 4 figures
Collective modes of quantum dot ensembles in microcavities
Creators: name: Averkiev, N. S.
name: Glazov, M. M.
name: Poddubny, A. N.
Publisher: name: arXiv
Year: 2008
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: Materials Science (cond-mat.mtrl-sci)
subject: Other Condensed Matter (cond-mat.other)
subject: FOS: Physical sciences

description: Emission spectra of quantum dot arrays in zero-dimensional microcavities are studied theoretically, and it is shown that they are determined by the competition between the formation of the collective superradiant mode and inhomogeneous broadening. The random sources method for the calculation of photoluminescence spectra under a non-resonant pumping is developed, and a microscopic justification of the random sources method within a framework of the standard diagram technique is given. The emission spectra of a microcavity are analyzed with allowance for the spread of exciton states energies caused by an inhomogeneous distribution of quantum dots and a tunneling between them. It is demonstrated that in the case of a strong tunneling coupling the luminescence spectra are sensitive to the geometric positions of the dots, and the collective mode can, under certain conditions, be stabilized by the random tunnel junctions.
description: 8 pages, 5 figures
Gaia, extinction, and the Galactic mid-plane
Creators: name: Cantat-Gaudin, Tristan
Publisher: name: Zenodo
Year: 2023

description: Gaia has revolutionised our ability to identify clusters and to use them as tracers of the Galactic structure. Our view is however severely limited when looking towards the inner regions of the Milky Way, where the clusters we do see are very young and very massive. The differences between the inner and outer disc are in part due to observational biases, but could also indicate that different environments lead to different preferential modes of star formation. Upcoming mid-infrared astrometric missions such as JASMINE and GaiaNIR will allow us to probe the inner disc and shed light on the processes driving cluster formation and dispersal.
The algebraic concordance order of a knot
Creators: name: Livingston, Charles
Publisher: name: arXiv
Year: 2008
Subjects: subject: Geometric Topology (math.GT)
subject: FOS: Mathematics
subject: 57M25

description: Levine defined the rational algebraic knot concordance group and proved that each nontrivial element is of order two, of order four, or of infinite order. The determination of the order of an element depends on a p-adic analysis for all primes p. Here we develop effective means to determine the order of any element that is in the image of the integral algebraic concordance group by restricting the set of primes that need to be considered and by finding simple tests that often avoid p-adic considerations. The paper includes an outline of how the results apply to give the determination of the algebraic orders of all 2,977 prime knots of 12 or fewer crossings. The paper also includes a short expository account of the necessary background in p-adic numbers and Witt groups of bilinear forms.
description: 17 pages, minor typographical errors corrected
Top quark in theory
Creators: name: Laenen, Eric
Publisher: name: arXiv
Year: 2008
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: I review how the top quark is embedded in the Standard Model and some its proposed extensions, and how it manifests itself in various hadron collider signals.
description: 12 pages
The two-spinon transverse structure factor of the gapped Heisenberg antiferromagnetic chain
Creators: name: Caux, J. -S.
name: Mossel, J.
name: Castillo, I. Pérez
Publisher: name: arXiv
Year: 2008
Subjects: subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: Statistical Mechanics (cond-mat.stat-mech)
subject: FOS: Physical sciences

description: We consider the transverse dynamical structure factor of the anisotropic Heisenberg spin-1/2 chain (XXZ model) in the gapped antiferromagnetic regime ($Δ> 1$). Specializing to the case of zero field, we use two independent approaches based on integrability (one valid for finite size, the other for the infinite lattice) to obtain the exact two-spinon part of this correlator. We discuss in particular its asymmetry with respect to the $π/2$ momentum line, its overall anisotropy dependence, and its contribution to sum rules.
description: 19 pages, 6 figures
Chiral geometries of (2+1)-d AdS gravity
Creators: name: Lowe, David A.
name: Roy, Shubho
Publisher: name: arXiv
Year: 2008
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: Pure gravity in (2+1)-dimensions with negative cosmological constant is classically equivalent Chern-Simons gauge theory with gauge group SO(2; 2), which may be realized on chiral and antichiral gauge connections. This paper looks at half-AdS geometries i.e. those with a trivial rightmoving gauge connection while the left-moving connection is a standard (Banados-Teitelboim- Zanelli) BTZ connection. These are shown to be related by diffeomorphism to a BTZ geometry with different mass and angular momentum. Generically this is over-spinning, leading to a naked closed timelike curves. Other closely related solutions are also studied. These results suggest that the measure of the Chern-Simons path integral cannot factorize in a chiral way, if it is to represent a sum over physically sensible states.
description: 10 pages
A 500 kpc HI Extension of the Virgo Pair NGC4532/DDO137 Detected by the Arecibo Legacy Fast ALFA (ALFALFA) Survey
Creators: name: Koopmann, R. A.
name: Giovanelli, R.
name: Haynes, M. P.
name: Kent, B. R.
name: Balonek, T. J.
name: Brosch, N.
name: Higdon, J. L.
name: Salzer, J. J.
name: Spector, O.
Publisher: name: arXiv
Year: 2008
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: We report the discovery of a ~500 kpc HI extension southwest of the Virgo Cluster HI-rich pair NGC 4532/DDO 137, detected as part of the Arecibo Legacy Fast ALFA (ALFALFA) Survey. The feature is the longest and most massive HI tail structure so far found in the Virgo Cluster and, at 1.8 Mpc from M87, the most distant from the main concentration of the intracluster medium. The structure is spatially and spectrally separated into two ridges and is defined by diffuse emission and discrete clumps of mass 2.5 - 6.8 x 10**7 solar masses. All emission is blue-shifted with respect to the NGC 4532/DDO 137 pair emission. Including diffuse emission, the structure has a total mass of up to 7 x 10**8 solar masses, equivalent to ~10% of the system's HI mass. Optical R-band imaging finds no counterparts to a level of 26.5 mag arcsec**-2. The characteristics of the structure appear most consistent with a tidal origin.
description: To appear in Astrophysical Journal Letters. 5 pages. Version with high resolution figures available at http://minerva.union.edu/koopmanr/preprints.html
Impact of Channel Aging on Zero-Forcing Precoding in Cell-Free Massive MIMO Systems
Creators: name: Jiang, Wei
name: Schotten, Hans Dieter
Publisher: name: arXiv
Year: 2021
Subjects: subject: Information Theory (cs.IT)
subject: Signal Processing (eess.SP)
subject: FOS: Computer and information sciences
subject: FOS: Electrical engineering, electronic engineering, information engineering

description: In the context of cell-free massive multi-input multi-output (mMIMO), zero-forcing precoding (ZFP) requires the exchange of instantaneous channel state information and precoded data symbols via a fronthaul network. It causes considerable propagation and processing delays, which degrade performance. This letter analyzes the impact of channel aging on the performance of ZFP in cell-free mMIMO. The aging effects of not only user mobility but also phase noise are considered. Numerical results in terms of per-user spectral efficiency are illustrated.
Nanoengineering Carbon Allotropes from Graphene
Creators: name: Lusk, Mark T.
name: Carr, L. D.
Publisher: name: arXiv
Year: 2008
Subjects: subject: Materials Science (cond-mat.mtrl-sci)
subject: FOS: Physical sciences

description: Monolithic structures can be built into graphene by the addition and subsequent re-arrangement of carbon atoms. To this end, ad-dimers of carbon are a particularly attractive building block because a number of emerging technologies offer the promise of precisely placing them on carbon surfaces. In concert with the more common Stone-Wales defect, repeating patterns can be introduced to create as yet unrealized materials. The idea of building such allotropes out of defects is new, and we demonstrate the technique by constructing two-dimensional carbon allotropes known as haeckelite. We then extend the idea to create a new class of membranic carbon allotropes that we call \emph{dimerite}, composed exclusively of ad-dimer defects.
description: 5 pages, 5 figures
The Mid-Infrared Narrow Line Baldwin Effect Revealed by Spitzer
Creators: name: Keremedjiev, M.
name: Hao, L.
name: Charmandaris, V.
Publisher: name: arXiv
Year: 2008
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: We present our discovery of a narrow-line Baldwin effect, an anti-correlation between the equivalent width (EW) of a line and the flux of the associated continuum, in 5-20$μ$m mid-infared lines from a sample of 68 Active Galactic Nuclei (AGN), located at z$
description: 18 pages, 4 figures. Accepted for publication by ApJ