10,839 research outputs found

    Tubes Containing String Modules in Symmetric Special Multiserial Algebras

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    We provide a method for determining the existence and ranks of tubes in the stable Auslander-Reiten quiver of symmetric special multiserial algebras using only the information from the underlying Brauer configuration. Essentially, we generalise the notion of a Green walk around a Brauer graph to the notion of a Green `hyperwalk' around a Brauer configuration, and show that these walks determine the number and rank of some of the stable tubes of the corresponding algebra. This description includes both tame and wild symmetric special multiserial algebras. We also provide a description of additional rank two tubes in both tame and wild algebras that do not arise from Green hyperwalks, but which nevertheless contain string modules at the mouth.Comment: 45 page

    The Importance of Transparency and Willingness to Share Personal Information

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    This study investigates the extent to which individuals are willing to share their sensitive personal information with companies. The study examines whether skepticism can influence willingness to share information. Additionally, it seeks to determine whether transparency can moderate the relationship between skepticism and willingness to share and whether 1) companies perceived motives, 2) individual’s prior privacy violations, 3) individuals’ propensity to take risks, and 4) individuals self-efficacy act as antecedents of skepticism. Partial Least Squares (PLS) regression is used to examine the relationships between all the factors. The findings indicate that skepticism does have a negative impact on willingness to share personal information and that transparency can reduce skepticis

    Topological Speedups

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    Given a dynamical system (X,T)(X,T) one can define a speedup of (X,T)(X,T) as another dynamical system conjugate to S:XXS:X\rightarrow X where S(x)=Tp(x)(x)S(x)=T^{p(x)}(x) for some function p:XZ+p:X\rightarrow\mathbb{Z}^{+}. In 19851985 Arnoux, Ornstein, and Weiss showed that any aperiodic, not necessarily ergodic, measure preserving system is isomorphic to a speedup of any ergodic measure preserving system. In this paper we study speedups in the topological category. Specifically, we consider minimal homeomorphisms on Cantor spaces. Our main theorem gives conditions on when one such system is a speedup of another. Furthermore, the main theorem serves as a topological analogue of the Arnoux, Ornstein, and Weiss speedup theorem, as well as a 'one-sided" orbit equivalence theorem

    Linking the Culpability and Circumstantial Evidence Requirements for the Spoliation Inference

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    Today  Real  estate  companies  face  the  challenge  where  extensive  renovations  on  existing housing built before 1980 must be performed. Conditions have changed and the housing need performance-­‐enhancing measures that meet today's quality. With a current renovation rate,  it  would  take  30  years  to  meet  the  renovation  needs.  The  renovation  rate  must therefore rise dramatically, which requires the real estate companies to act consistently in accordance with commercial principles and in an economically, socially and environmentally responsible way. The  paper  discusses  renovation  strategies  in  four  municipal  housing  companies  in  the Stockholm  suburbs.  The  report  includes  surveys  of  four  ongoing  renovation  projects; Fastighets AB Förvaltaren in Sundbyberg project Hundloken 3, Stiftelsen Signalisten in Solna project Ritorp, Sollentunahem in Sollentuna project Svalgången och Väsbyhem in Upplands Väsby project Dragonvägen. The main purpose of this study was to analyze the practices of redevelopment projects. What opportunities and obstacles arise and how do the housing companies choose to respond to the current societal requirements. How do you work with redevelopment projects and how do you finance these.  The purpose of this paper is not to provide a clear and definite conclusion; the basis of the thesis has therefor been case studies. As the needs and conditions vary depending on the renovation project; there are no standard solutions, but there are important issues to be highlighted. It can be noted that the hard part of a renovation project is to get a flow without any barriers, where both the tenant's needs and wishes are taken into account and at  the same time it has to be economically and socially reasonable for the companies to implement the great need of renovation. The study indicates to some important questions to  have  in  consideration  when  renovating;  a  social  responsibility  to  not  stop  the  ever growing housing queue and a financial responsibility to ensure that the tenant is possible to take on the new rent increase that comes with refurbishment and also reasoning about the grounds  on  which  one  should  get  the  right  to  appeal  renovations.  The  results  generated  in this report should be seen as a basis for further discussion on the issue.Fastighetsbolag  står  idag  inför  utmaningen  där  omfattande  renoveringar  på  befintliga fastigheter byggda innan  1980-­‐talet  måste realiseras. Förutsättningarna har ändrats  och fastigheterna  behöver  prestandahöjande  åtgärder som  möter  dagens  kvalitet.    Med  en nuvarande   renoveringstakt   skulle   det   ta   30   år   att   tillgodose   renoveringsbehovet. Upprustningstakten måste således öka radikalt, vilket ställer krav på fastighetsbolagen att agera  konsekvent  enligt  affärsmässiga  principer  och  på  ett  ekonomiskt,  socialt  och miljömässigt försvarbart sätt. Den  här  uppsatsen  behandlar  renoveringsstrategier  på  fyra  kommunala  allmännyttiga fastighetsbolag i Stockholmsförorter. Rapporten innefattar undersökningar av fyra pågående renoveringsprojekt; Fastighets AB Förvaltaren i Sundbyberg projekt Hundloken 3, Stiftelsen Signalisten  i  Solna  projekt  Ritorp,  Sollentunahem  i  Sollentuna  projekt  Svalgången  och Väsbyhem i Upplands Väsby projekt Dragonvägen.   Huvudsyftet med studien har varit att analysera tillvägagångssätt vid ombyggnadsprojekt. Vilka förutsättningar och hinder uppstår och  hur  väljer  man  att  bemöta  de  aktuella  samhällskraven.  Hur  arbetar  man  kring ombyggnadsprojekt och hur finansieras dessa.  Avsikten med uppsatsen är inte att lämna någon tydlig och klar slutsats, utgångspunkten i uppsatsen har därför varit fallstudier. Då behov och förutsättningar varierar beroende av renoveringsprojekt finns inga standardlösningar, men däremot finns det viktiga frågor att lyfta fram. Det man kan konstatera är att det svåra i ett renoveringsprojekt, är att få ett flöde utan  hinder där såväl hyresgästens behov och önskemål beaktas samtidigt som det för företagen ska vara företagsekonomiskt och samhällsekonomiskt försvarbart att genomföra det stora behovet av upprustningar. Studien indikerar för en del viktiga punkter att tänka på; socialt ansvar att inte stoppa upp den ständigt växande bostadskön och ett ekonomiskt ansvar att se till att det för hyresgästen är möjligt att ta sig an ny hyreshöjning som kommer med renovering samt resonemang kring på vilka grunder man ska få rätten att överklaga renoveringar. Det resultat som uppkommer i rapporten bör ses som underlag för vidare diskussion                                                               kring                                                               frågan

    Low-mass X-ray binaries from black-hole retaining globular clusters

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    Recent studies suggest that globular clusters (GCs) may retain a substantial population of stellar-mass black holes (BHs), in contrast to the long-held belief of a few to zero BHs. We model the population of BH low-mass X-ray binaries (BH-LMXBs), an ideal observable proxy for elusive single BHs, produced from a representative group of Milky Way GCs with variable BH populations. We simulate the formation of BH-binaries in GCs through exchange interactions between binary and single stars in the company of tens to hundreds of BHs. Additionally, we consider the impact of the BH population on the rate of compact binaries undergoing gravitational wave driven mergers. The characteristics of the BH-LMXB population and binary properties are sensitive to the GCs structural parameters as well as its unobservable BH population. We find that GCs retaining 1000\sim 1000 BHs produce a galactic population of 150\sim 150 ejected BH-LMXBs whereas GCs retaining only 20\sim20 BHs produce zero ejected BH-LMXBs. Moreover, we explore the possibility that some of the presently known BH-LMXBs might have originated in GCs and identify five candidate systems.Comment: 27 pages, 18 figures, 7 tables, submitted to MNRA
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