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Search Results: 1 - 10 of 189981 matches for " G. Cates "
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The Dark Side of Working in a Virtual World: An Investigation of the Relationship between Workplace Isolation and Engagement among Teleworkers  [PDF]
Russell Davis, Steven Cates
Journal of Human Resource and Sustainability Studies (JHRSS) , 2013, DOI: 10.4236/jhrss.2013.12002
Abstract: Teleworking is an alternate work arrangement that has transformed the workplace that allows workers to fulfill their job assignment from any location away from the traditional office. Although this work arrangement has been growing in popularity due to various factors such as concerns for the environment, advances in communication technologies, and the globalization of the workforce, there are growing concerns that frequent use of teleworking may cause increase perceptions of feeling isolated [1] Golden, 2001; [2] Marshall, 2007; [3] Golden & Veiga, 2006; [4] Copper & Kurland, 2002). Additionally little or no research has been conducted on how feeling isolated influence engagement among teleworkers. The purpose of this quantitative research study is to investigate the relationship between workplace isolation and engagement and to determine to what extent the relationship between workplace isolation and gender among teleworkers. A survey consisting of the Workplace Isolation Scale [2] Marshall, 2007, Employee Engagement Scale [5] DDI, 2005 and demographic factors was used to investigate the relationship between workplace isolation and engagement and used to determine the relationship between workplace isolation and gender among 472 teleworkers. Using a correlational research design, it is found there is a statistically significant relationship between workplace isolation and employee engagement. Workplace isolation scores are shown to have a strong negative correlation with employee engagement scores. A regression analysis utilizing employee engagement as the dependent variable and workplace isolation as the independent variable is conducted. The results indicate statistical significance in that workplace isolation scores predicted employee engagement scores. A two-independent-sample t test is conducted to determine if there is enough evidence to suggest the mean workplace isolation scores are related to gender. The results of the t test are inconclusive. However using descriptive statistics techniques it is discovered respondents who telework 3 to 5 days a week have lower workplace isolation means scores than those who teleworked 1, 2 and 4 days a week. Leaders of organizations can use the results of this study to assist in the development of teleworking engagement strategies that not only target reducing workplace isolation perceptions to enhance engagement for teleworkers, but also to address possible issues related to increased perceptions of isolation across gender.
Local size segregation in polydisperse hard sphere fluids
I. Pagonabarraga,M. E. Cates,G. J. Ackland
Physics , 1999, DOI: 10.1103/PhysRevLett.84.911
Abstract: The structure of polydisperse hard sphere fluids, in the presence of a wall, is studied by the Rosenfeld density functional theory. Within this approach, the local excess free energy depends on only four combinations of the full set of density fields. The case of continuous polydispersity thereby becomes tractable. We predict, generically, an oscillatory size segregation close to the wall, and connect this, by a perturbation theory for narrow distributions, with the reversible work for changing the size of one particle in a monodisperse reference fluid.
A possible new phase of antagonistic nematogens in a disorienting field
T. G. Sokolovska,M. E. Cates,R. O. Sokolovskii
Physics , 2003, DOI: 10.1103/PhysRevLett.90.235701
Abstract: A simple model is proposed for nematogenic molecules that favor perpendicular orientations as well as parallel ones. (Charged rods, for example, show this antagonistic tendency.) When a small disorienting field is applied along $z$, a low density phase $N_-$ of nematic order parameter $S_z<0$ coexists with a dense biaxial nematic $N_b$. (At zero field, $N_-$ becomes isotropic and $N_b$ uniaxial.) But at stronger fields, a new phase $N_{+4}$, invariant under $\pi/2$ rotations around the field axis, appears in between $N_-$ and $N_b$. Prospects for finding the $N_{+4}$ phase experimentally are briefly discussed.
Model fluid in a porous medium: results for a Bethe lattice
R. O. Sokolovskii,M. E. Cates,T. G. Sokolovska
Physics , 2003, DOI: 10.1103/PhysRevE.68.026124
Abstract: We consider a lattice gas with quenched impurities or `quenched-annealed binary mixture' on the Bethe lattice. The quenched part represents a porous matrix in which the (annealed) lattice gas resides. This model features the 3 main factors of fluids in random porous media: wetting, randomness and confinement. The recursive character of the Bethe lattice enables an exact treatment, whose key ingredient is an integral equation yielding the one-particle effective field distribution. Our analysis shows that this distribution consists of two essentially different parts. The first one is a continuous spectrum and corresponds to the macroscopic volume accessible to the fluid, the second is discrete and comes from finite closed cavities in the porous medium. Those closed cavities are in equilibrium with the bulk fluid within the grand canonical ensemble we use, but are inaccessible in real experimental situations. Fortunately, we are able to isolate their contributions. Separation of the discrete spectrum facilitates also the numerical solution of the main equation. The numerical calculations show that the continuous spectrum becomes more and more rough as the temperature decreases, and this limits the accuracy of the solution at low temperatures.
A Simple Model for the Deformation-Induced Relaxation of Glassy Polymers
S. M. Fielding,R. G. Larson,M. E. Cates
Physics , 2011, DOI: 10.1103/PhysRevLett.108.048301
Abstract: Glassy polymers show strain hardening: at constant extensional load, their flow first accelerates, then arrests. Recent experiments have found this to be accompanied by a striking and unexplained dip in the segmental relaxation time. Here we explain such behavior by combining a minimal model of flow-induced liquefaction of a glass, with a description of the stress carried by strained polymers, creating a non-factorable interplay between aging and strain-induced rejuvenation. Under constant load, liquefaction of segmental motion permits strong flow that creates polymer-borne stress. This slows the deformation enough for the segmental modes to re-vitrify, causing strain hardening.
Discrimination in a Covert Methodology: An Analysis of Physical and Social Characteristics That Prohibit People from Becoming Employed  [PDF]
Steven V. Cates, Heather Dana
iBusiness (IB) , 2012, DOI: 10.4236/ib.2012.42022
Abstract: Organizations all over the world are found guilty of using stereotypes to discriminate against applicants in the selection process for employment. This research seeks to answer the question what stereotypes are used to discriminate against people in the selection process and consequently provide an analysis of the physical and social characteristics that prohibit people from gaining employment. A sample of 87 working adults taking a Human Resources Management course were selected to complete a survey that questioned them on physical characteristics and how they affected their decisions on hiring or rejecting applicants. Historical research has held that interviews possess some stereotypes such as race, gender, age, height and weight to judge applicants rather than their skills, knowledge and ability to perform the job. Five hypotheses were posited for testing. Mixed support was provided that respondents ignore most stereotypical characteristics in the employment selection process but surprisingly strong support for one’s appearance and dress was found. It is recommended that interviewers undertake detailed training, decrease stereotyping by focusing on job description and keep interviews job related. It is also wise for interviews to include tests when judging applicant’s skills, knowledge and ability. Federal laws and the Equal Employment Opportunity Commission also serve to ensure that equal opportunity is granted to all and discrimination is avoided.
Information and Communication Technology to Link Criminal Justice Reentrants to HIV Care in the Community
Ann Kurth,Irene Kuo,James Peterson,Nkiru Azikiwe,Lauri Bazerman,Alice Cates,Curt G. Beckwith
AIDS Research and Treatment , 2013, DOI: 10.1155/2013/547381
Abstract: The United States has the world’s highest prison population, and an estimated one in seven HIV-positive persons in the USA passes through a correctional facility annually. Given this, it is critical to develop innovative and effective approaches to support HIV treatment and retention in care among HIV-positive individuals involved in the criminal justice (CJ) system. Information and communication technologies (ICTs), including mobile health (mHealth) interventions, may offer one component of a successful strategy for linkage/retention in care. We describe CARE+ Corrections, a randomized controlled trial (RCT) study now underway in Washington, that will evaluate the combined effect of computerized motivational interview counseling and postrelease short message service (SMS) text message reminders to increase antiretroviral therapy (ART) adherence and linkage and retention in care among HIV-infected persons involved in the criminal justice system. In this report, we describe the development of this ICT/mHealth intervention, outline the study procedures used to evaluate this intervention, and summarize the implications for the mHealth knowledge base. 1. Introduction The criminal justice system in the USA comprised prisons, jails, and community supervision programs including probation and parole and incarcerates more persons than any other nation in the world which disproportionately affects persons of color, the economically disadvantaged, and those who suffer from mental illness [1, 2]. In 2011, there were close to 7 million persons within the CJ system, among which 1.5 million were in prison, 4.5 million were on probation or parole, and close to 750,000 were held in local jails [3]. Prisons typically incarcerate sentenced individuals for periods of one year or greater, whereas jails incarcerate the majority of persons for short periods of time (days, weeks) before releasing them back to the community. A significant proportion of arrests are related to drug and alcohol use [4], with more than 50% of inmates meeting the DSM-IV criteria for drug dependence or abuse [5]. Due to drug laws and punitive sentencing, the criminal justice system is a nexus for large numbers of substance using individuals, many of whom are living with or are at risk for HIV [6]. It has been estimated that one in seven HIV-infected persons in the USA passes through correctional facilities in a given year [7], and for these persons, release into the community has been shown to be detrimental to antiretroviral therapy (ART) adherence and maintenance of HIV care [8–10]. New and
Colloids in active fluids: Anomalous micro-rheology and negative drag
G. Foffano,J. S. Lintuvuori,K. Stratford,M. E. Cates,D. Marenduzzo
Physics , 2012, DOI: 10.1103/PhysRevLett.109.028103
Abstract: We simulate an experiment in which a colloidal probe is pulled through an active nematic fluid. We find that the drag on the particle is non-Stokesian (not proportional to its radius). Strikingly, a large enough particle in contractile fluid (such as an actomyosin gel) can show negative viscous drag in steady state: the particle moves in the opposite direction to the externally applied force. We explain this, and the qualitative trends seen in our simulations, in terms of the disruption of orientational order around the probe particle and the resulting modifications to the active stress.
Shear banding and flow-concentration coupling in colloidal glasses
R. Besseling,L. Isa,P. Ballesta,G. Petekidis,M. E. Cates,W. C. K. Poon
Physics , 2010, DOI: 10.1103/PhysRevLett.105.268301
Abstract: We report experiments on hard sphere colloidal glasses that reveal a type of shear banding hitherto unobserved in soft glasses. We present a scenario that relates this to an instability arising from shear-concentration coupling, a mechanism previously thought unimportant in this class of materials. Below a characteristic shear rate $\dot\gamma_c$ we observe increasingly non-linear velocity profiles and strongly localized flows. We attribute this trend to very slight concentration gradients (likely to evade direct detection) arising in the unstable flow regime. A simple model accounts for both the observed increase of $\dot\gamma_c$ with concentration, and the fluctuations observed in the flow.
Glass Rheology: From mode-coupling theory to a dynamical yield criterion
J. M. Brader,Th. Voigtmann,M. Fuchs,R. G. Larson,M. E. Cates
Physics , 2009, DOI: 10.1073/pnas.0905330106
Abstract: The mode coupling theory (MCT) of glasses, while offering an incomplete description of glass transition physics, represents the only established route to first-principles prediction of rheological behavior in nonergodic materials such as colloidal glasses. However, the constitutive equations derivable from MCT are somewhat intractable, hindering their practical use and also their interpretation. Here, we present a schematic (single-mode) MCT model which incorporates the tensorial structure of the full theory. Using it, we calculate the dynamic yield surface for a large class of flows.
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