1,148 research outputs found

    Change Management Practices on Organization Performance: A Case Study of Mandera Kenya Prisons Service

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    In the last decade Kenya Prisons Service has been implementing changes. The widespread perception is that the reforms process has lost momentum. Some reports reveal that prisons in Kenya have problems touching on financial mismanagement, poor governance, and congestion and overcrowding, rights buses, emerging technologies putting pressure on the organization and warders are still living miserably in ramshackle houses across the country, as reforms started in 2003 are painstakingly slow. Therefore the study sought to determine influence of change management practices on organization performance of prisons service in Kenya. The study was guided by the following specific objectives: To determine the influence of communication, stakeholder’s participation, management skills and finances on organization performance in Mandera Kenya Prisons Service. The study used descriptive research design. This design involved gathering data that describe events and then organizes, tabulates, depicts, and describes the data. The study target population included 100 prisoners, 28 Kenya Prisons Officers and 5 professionals who work in Mandera Kenya Prisons Service making the total target population of the study to be 133. Stratified and simple random sampling techniques were used. A sample of 85 respondents was considered. The study used quantitative data analysis approaches.Quantitative data was analysed by use of descriptive statistics with an aid of Statistical Package for Social Sciences (SPSS) version 21. Data was then presented in graphs and tables. Further, a multiple regression analysis was used to establish the relationship between the dependent and the independent variables. The study concluded that the mostly commonly used mode of communication used was face to face communication. Further from the findings the researcher concluded that communication is very effective in delegation of duties, forwarding of grievances and enacting disciplinary procedures. Inadequate and less effective communication is a major factor that impacts on the change management process. The researcher recommended that Communication should be done to the entire workforce, it must also occur frequently and the organization should encourage its executives and middle level managers to initiate change. Keywords: Change, implementation, performance

    Optimized Multi-Frequency Spectra for Applications in Radiative Feedback and Cosmological Reionization

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    The recent implementation of radiative transfer algorithms in numerous hydrodynamics codes has led to a dramatic improvement in studies of feedback in various astrophysical environments. However, because of methodological limitations and computational expense, the spectra of radiation sources are generally sampled at only a few evenly-spaced discrete emission frequencies. Using one-dimensional radiative transfer calculations, we investigate the discrepancies in gas properties surrounding model stars and accreting black holes that arise solely due to spectral discretization. We find that even in the idealized case of a static and uniform density field, commonly used discretization schemes induce errors in the neutral fraction and temperature by factors of two to three on average, and by over an order of magnitude in certain column density regimes. The consequences are most severe for radiative feedback operating on large scales, dense clumps of gas, and media consisting of multiple chemical species. We have developed a method for optimally constructing discrete spectra, and show that for two test cases of interest, carefully chosen four-bin spectra can eliminate errors associated with frequency resolution to high precision. Applying these findings to a fully three-dimensional radiation-hydrodynamic simulation of the early universe, we find that the HII region around a primordial star is substantially altered in both size and morphology, corroborating the one-dimensional prediction that discrete spectral energy distributions can lead to sizable inaccuracies in the physical properties of a medium, and as a result, the subsequent evolution and observable signatures of objects embedded within it.Comment: 15 pages, 13 figures, 2 tables, accepted for publication in the Astrophysical Journa

    A vacuum (10(exp -9) Torr) friction apparatus for determining friction and endurance life of MoSx films

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    The first part of this paper describes an ultrahigh vacuum friction apparatus (tribometer). The tribometer can be used in a ball-on-disk configuration and is specifically designed to measure the friction and endurance life of solid lubricating films such as MoS(x) in vacuum at a pressure of 10 exp -7 Pa. The sliding mode is typically unidirectional at a constant rotating speed. The second part of this paper presents some representative friction and endurance life data for magnetron sputtered MoS(x) films (110 nm thick) deposited on sputter-cleaned 440 C stainless-steel disk substrates, which were slid against a 6-mm-diameter 440 C stainless-steel bearing ball. All experiments were conducted with loads of 0.49 to 3.6 N (average Hertzian contact pressure, 0.33 to 0.69 GPa), at a constant rotating speed of 120 rpm (sliding velocity ranging from 31 to 107 mm/s due to the range of wear track radii involved in the experiments), in a vacuum of 7 x 10 exp -7 Pa and at room temperature. The results indicate that there are similarities in friction behavior of MoS(x) films overs their life cycles regardless of load applied. The coefficient of friction (mu) decreases as load W increases according to mu = kW exp -1/3. The endurance life E of MoS(x) films decreases as the load W increases according to E = KW exp -1.4 for the load range. The load- (or contract-pressure-) dependent endurance life allows us to reduce the time for wear experiments and to accelerate endurance life testing of MoS(x) films. For the magnetron-sputtered MoS(x) films deposited on 440 C stainless-steel disks: the specific wear rate normalized to the load and the number of revolutions was 3 x 10 exp -8 mm exp 3/N-revolution; the specific wear rate normalized to the load and the total sliding distance was 8 x 10 exp -7 mm exp 3/N-m; and the nondimensional wear coefficient of was approximately 5 x 10 exp -6. The values are almost independent of load in the range 0.49 to 3.6 N (average Hertzian contact pressures of 0.33 to 0.69 GPa)

    Service quality and value perceptions of the 2014 FIFA World Cup in Brazil

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    This study examines the relationships between service quality and value perceptions of the 2014 FIFA World Cup in Brazil, controlling for the consumers' opinion about hosting the event in the country. Data were collected from five cities (n = 3,042), and the results from a structural model indicate that teams, accessibilities, and event atmosphere have a positive influence on hedonic value and utilitarian value, while referees only have a positive impact on hedonic value. In turn, crowd experience has a negative effect on both hedonic and utilitarian value. Additionally, consumers' favorable opinion about hosting the event showed a positive effect on both hedonic and utilitarian value. These findings suggest the need for an appealing ambiance and crowd vigilance to enhance the event's value. In addition, the more people agree with hosting the event in Brazil the greater the value perception, highlighting the importance of explaining the event benefits to the host community.</jats:p

    Trauma and Trichotillomania: A Tenuous Relationship

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    Some have argued that hair pulling in trichotillomania (TTM) is triggered by traumatic events, but reliable evidence linking trauma to TTM is limited. However, research has shown that hair pulling is associated with emotion regulation, suggesting a connection between negative affect and TTM. We investigated the associations between trauma, negative affect, and hair pulling in a cross-sectional sample of treatment seeking adults with TTM (N=85). In the current study, participants’ self-reported traumatic experiences were assessed during a structured clinical interview, and participants completed several measures of hair pulling severity, global TTM severity, depression, anxiety, experiential avoidance, and quality of life. Those who experienced trauma had more depressive symptoms, increased experiential avoidance, and greater global TTM severity. Although the presence of a trauma history was not related to the severity of hair pulling symptoms in the past week, depressive symptoms mediated the relationship between traumatic experiences and global TTM severity. These findings cast doubt on the notion that TTM is directly linked to trauma, but suggest that trauma leads to negative affect that individuals cope with through hair pulling. Implications for the conceptualization and treatment of TTM are discussed

    Isolating the effects of visual imagery on prospective memory

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    Two experiments investigated the role of visual imagery in prospective memory (PM). In experiment 1, 140 participants completed a general knowledge quiz which included a PM task of writing a letter ‘X’ next to any questions that referred to space. Participants either visualised themselves performing this task, verbalised an implementation intention about the task, did both, or did neither. Performance on the PM task was enhanced in both conditions involving visual imagery but not by implementation intentions alone. In experiment 2, 120 participants imagined themselves writing a letter ‘X’ next to questions about space, or in a bizarre imagery condition imagined themselves drawing an alien next to those questions. Relative to the control condition, PM was significantly enhanced when participants imagined writing a letter ‘X’ next to the target questions, but not by the bizarre imagery task. The findings indicate that the robust effects of imagery observed in retrospective memory also extend to PM

    What oncologists tell patients about survival benefits of palliative chemotherapy and implications for informed consent: qualitative study

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    Objective To examine how much oncologists tell patients about the survival benefit of palliative chemotherapy during consultations at which decisions about treatment are made

    TeV scale resonant leptogenesis from supersymmetry breaking

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    We propose a model of TeV-scale resonant leptogenesis based upon recent models of the generation of light neutrino masses from supersymmetry-breaking effects with TeV-scale right-handed (rhd) neutrinos, NiN_i. The model leads to naturally large cosmological lepton asymmetries via the resonant behaviour of the one-loop self-energy contribution to NiN_i decay. Our model addresses the primary problems of previous phenomenological studies of low-energy leptogenesis: a rational for TeV-scale rhd neutrinos with small Yukawa couplings so that the out-of equilibrium condition for NiN_i decay is satisfied; the origin of the tiny, but non-zero mass splitting required between at least two NiN_i masses; and the necessary non-trivial breaking of flavour symmetries in the rhd neutrino sector. The low mass-scale of the rhd neutrinos and their superpartners, and the TeV-scale AA-terms automatically contained within the model offer opportunities for partial direct experimental tests of this leptogenesis mechanism at future colliders.Comment: 10 Pages latex, version for JHE
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