352 research outputs found

    Dissipative Tunneling in 2 DEG: Effect of Magnetic Field, Impurity and Temperature

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    We have studied the transport process in the two dimensional electron gas (2DEG) in presence of a magnetic field and a dissipative environment at temperature T. By means of imaginary time series functional integral method we calculate the decay rates at finite temperature and in the presence of dissipation. We have studied decay rates for wide range of temperatures -- from the thermally activated region to very low temperature region where the system decays by quantum tunneling. We have shown that dissipation and impurity helps the tunneling. We have also shown that tunneling is strongly affected by the magnetic field. We have demonstrated analytical results for all the cases mentioned above.Comment: 8 pages, 2 figure

    Toward the Development of Ethical Guidelines for Family Preservation

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    Family preservation workers need a standard set of ethical guidelines to assist them in providing their service in a proper manner. This paper describes how ethical codes have been developed for the traditional mental health care disciplines and why such codes are not sufficient for the type of work done in family preservation. The paper further provides examples of the types of ethical dilemmas family preservation workers encounter as well as suggestions for workers, supervisors, and agencies in dealing with such dilemmas

    Effectiveness of Hiring Emergency Mental Health Specialist(s) at VA Medical Center Fresno, California

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    The Department of Veteran Affairs (VA) provides services in 170 medical centers nationwide, and it is famous for extensive wait times, short staffing issues, and employees\u27 minimal pay for their occupations. The mental health departments throughout the VA medical facilities have consistently struggled to hire sufficient mental health staff, psychologists, and psychiatrists for years. Lack of timely support results in severe mental and emotional health issues, including increased suicidal incidents, drug abuse, and homelessness among veterans. Studies from October 2017 through September 2018 showed that 41,270 newly registered veterans were screened for PTSD, suicidal attempts, and drug abuse. Among them, 61% were screened positive for mental health disorders (Bovin, 2022; Choi & Roberson, 2022). This study applied a Mixed-Methods Research (MMR) approach and collected data from 35 respondents (Quan = 30 and Qual 05), testing three assumptions. The study revealed that 83% of the respondents strongly agree that hiring emergency mental health specialists will reduce drug abuse among veterans, and 100% strongly agree that the added facility will improve the veterans\u27 homelessness conditions. Both quantitative and qualitative findings indicated a strong need to provide more qualified physicians readily available to all VAMC for emergency purposes to reduce PTSD, suicidal incidents, drug abuse, and homelessness among veterans

    Chances in China

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    PT-symetrically regularized Eckart,Poeschl-Teller and Hulthen potentials

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    Version 1: The well known Eckart's singular s-wave potential is PT-symmetrically regularized and continued to the whole real line. The new model remains exactly solvable and its bound states remain proportional to Jacobi polynomials. Its real and discrete spectrum exhibits several unusual features. Version 2: Parity times time-reversal symmetry of complex Hamiltonians with real spectra is usually interpreted as a weaker mathematical substitute for Hermiticity. Perhaps an equally important role is played by the related strengthened analyticity assumptions. In a constructive illustration we complexify a few potentials solvable only in s-wave. Then we continue their domain from semi-axis to the whole axis and get the new exactly solvable models. Their energies come out real as expected. The new one-dimensional spectra themselves differ quite significantly from their s-wave predecessors.Comment: Original 10-page letter ``PT-symmetrized exact solution of the singular Eckart oscillator" is extended to a full pape

    Increasing Electron Transfer Rates with Increasing Donor-Acceptor Distance

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    Electron transfer can readily occur over long (≥15 Å) distances. Usually reaction rates decrease with increasing distance between donors and acceptors, but theory predicts a regime in which electron-transfer rates increase with increasing donor–acceptor separation. This counter-intuitive behavior can result from the interplay of reorganization energy and electronic coupling, but until now experimental studies have failed to provide unambiguous evidence for this effect. We report here on a homologous series of rigid rodlike donor-bridge-acceptor compounds in which the electron-transfer rate increases by a factor of 8 when the donor–acceptor distance is extended from 22.0 to 30.6 Å, and then it decreases by a factor of 188 when the distance is increased further to 39.2 Å. This effect has important implications for solar energy conversion

    A multimodal corpus of rapid dialogue games

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    Ponencia presentada en la Ninth International Conference on Language Resources and Evaluation (LREC'14)This paper presents a multimodal corpus of spoken human-human dialogues collected as participants played a series of Rapid DialogueGames (RDGs). The corpus consists of a collection of about 11 hours of spoken audio, video, and Microsoft Kinect data taken from 384game interactions (dialogues). The games used for collecting the corpus required participants to give verbal descriptions of linguisticexpressions or visual images and were specifically designed to engage players in a fast-paced conversation under time pressure. As aresult, the corpus contains many examples of participants attempting to communicate quickly in specific game situations, and it alsoincludes a variety of spontaneous conversational phenomena such as hesitations, filled pauses, overlapping speech, and low-latencyresponses. The corpus has been created to facilitate research in incremental speech processing for spoken dialogue systems. Potentially,the corpus could be used in several areas of speech and language research, including speech recognition, natural language understanding,natural language generation, and dialogue management.Fil: Paetzel, Maike. University of Southern California. Institute for Creative Technologies; United States of America.Fil: Racca, David Nicolás. University of Southern California. Institute for Creative Technologies; United States of America.Fil: Racca, David Nicolás. Universidad Nacional de Córdoba. Facultad de Matemática, Astronomía y Física; Argentina.Fil: De Vault, David. University of Southern California. Institute for Creative Technologies; United States of America.Ciencias de la Computació

    A space of one’s own:spatial and identity liminality in an online community of mothers

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    This paper investigates the role of an online community in the life of 11 Taiwanese women living in the UK and considers the implications this empirical case has for theorising about motherhood and the spatial dimensions of online/on-site space. Findings from a nethnographic and ethnographic fieldwork show how online discussions reflect and amplify the liminal identities of the community’s members. In looking at doing mothering at a collective rather than at the individual level, this study highlights how collective practices of consumption perpetuate liminal identities, exacerbating consumers’ sense of being out of place. It shows how online space is at the same time the product of online and on-site liminal identities and liminal social interactions and the re-producer of such interactions

    Nigellissima: A Study of Glamour, Performativity and Embodiment

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    This is a study of glamour, its complexities and its relationship with and role within celebrity culture. We explore glamour in the context of Nigella, the London-born TV cook, food writer and self-proclaimed ‘domestic goddess’ of British culinary culture. In our study we consider the interconnections between glamour, specifically Italian-style retro-glamour, and performativity in Nigella’s career. We also address the role of embodiment and authenticity in the masquerade of femininity. Our analysis focuses on Nigella’s glamour over time, considering its creation, enactment and reaffirmation following scandal. We conclude by speculating on glamour’s complex and ambivalent relationship with celebrity culture, and the role of vulnerability in creating authentic and enduring glamour in contemporary consumer society
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