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  • 1
    Language: English
    In: Thin Solid Films, August 31, 2015, Vol.589, p.712(6)
    Description: To link to full-text access for this article, visit this link: http://dx.doi.org/10.1016/j.tsf.2015.07.005 Byline: Moges Tsega, Dong-Hau Kuo, F.B. Dejene Abstract: Single-layered Cu.sub.2ZnSnSb(S,Se,Te).sub.4(CZTASSeTe) thin films were prepared on Mo/glass substrate by radio frequency magnetron sputtering of a self-prepared single ceramic target. Successive selenization for the as-deposited film at a substrate temperature of 200[degrees]C in Se-atmosphere was performed at various temperatures between 400[degrees]C and 600[degrees]C for 1h. Structural investigation of the grown films revealed single-phase tetragonal structure corresponding to kesterite CZTSSe. All measured samples were found to exhibit p-type conductivity. An improved grain size and crystal quality with suitable atomic ratio [Cu/(Zn+Sb+Sn)=0.89, Zn/Sn=1.15, and metal/(S+Se+Te)=1.02] obtained for CZTASSeTe film selenized at 600[degrees]C. The Hall concentration increased from 1.06 to 5.8x10.sup.17 cm.sup.-3, mobility increased from 2.82 to 44.3cm.sup.2 V.sup.-1 s.sup.-1, and resistivity decreased from 20.92 to 0.24I[c]cm as the precursor film is selenized to 600[degrees]C. An enhanced Hall mobility can be ascribed to the larger grains with better crystallinity and composition in the selenized film at 600[degrees]C. Our large grain size and maximized mobility for CZTASSeTe film at the selenization temperature of 600[degrees]C from single ceramic target can be useful for the fabrication of the CZTASSeTe absorber layer. Article History: Received 27 October 2014; Revised 18 June 2015; Accepted 2 July 2015
    ISSN: 0040-6090
    Source: Cengage Learning, Inc.
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  • 2
    Language: English
    In: Journal of Alloys and Compounds, April 25, 2013, Vol.557, p.142(5)
    Description: To link to full-text access for this article, visit this link: http://dx.doi.org/10.1016/j.jallcom.2013.01.012 Byline: Moges Tsega, Dong-Hau Kuo Keywords: Semiconductor; Powder metallurgy; Electronic property; Scanning electron microscopy (SEM) Abstract: Display Omitted Author Affiliation: Department of Materials Science and Engineering, National Taiwan University of Science and Technology, Taipei 10607, Taiwan
    Keywords: Sulfur Compounds -- Electric Properties ; Copper (Metal) -- Electric Properties
    ISSN: 0925-8388
    Source: Cengage Learning, Inc.
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  • 3
    Language: English
    In: Journal of Alloys and Compounds, Dec 15, 2013, Vol.580, p.217(6)
    Description: To link to full-text access for this article, visit this link: http://dx.doi.org/10.1016/j.jallcom.2013.05.105 Byline: Moges Tsega, Dong-Hau Kuo Abstract: Display Omitted Article History: Received 31 January 2013; Revised 6 May 2013; Accepted 16 May 2013
    Keywords: Sintering
    ISSN: 0925-8388
    Source: Cengage Learning, Inc.
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  • 4
    Language: English
    In: Information & Management, January 2013, Vol.50(1), pp.43-58
    Description: Recent studies have indicated that companies are increasingly experiencing Data Quality (DQ) related problems as more complex data are being collected. To address such problems, the literature suggests the implementation of a Total Data Quality Management Program (TDQM) that should consist of the following phases: DQ definition, measurement, analysis and improvement. As such, this paper performs an empirical study using a questionnaire that was distributed to financial institutions worldwide to identify the most important DQ dimensions, to assess the DQ level of credit risk databases using the identified DQ dimensions, to analyze DQ issues and to suggest improvement actions in a credit risk assessment context. This questionnaire is structured according to the framework of Wang and Strong and incorporates three additional DQ dimensions that were found to be important to the current context (i.e., actionable, alignment and traceable). Additionally, this paper contributes to the literature by developing a scorecard index to assess the DQ level of credit risk databases using the DQ dimensions that were identified as most important. Finally, this study explores the key DQ challenges and causes of DQ problems and suggests improvement actions. The findings from the statistical analysis of the empirical study delineate the nine most important DQ dimensions, which include accuracy and security for assessing the DQ level.
    Keywords: Data Quality ; Information Quality ; Credit Risk ; Data Definition ; Business
    ISSN: 0378-7206
    E-ISSN: 1872-7530
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  • 5
    Language: English
    In: Journal of Crystal Growth, April 1, Vol.415, p.106(5)
    Description: To link to full-text access for this article, visit this link: http://dx.doi.org/10.1016/j.jcrysgro.2015.01.003 Byline: Moges Tsega, Dong-Hau Kuo, F.B. Dejene Abstract: Vertically aligned undoped and Pb-doped ZnO (ZnPbO) nanorods have been successfully synthesized by a thermal evaporation-oxidation method with the Fe-based catalysts on sapphire substrate at different temperatures (600-700[degrees]C) for 2h. Effects of growth temperature and Pb-doping on the morphology, structure, and optical properties of as deposited nanorods have been investigated. The products at 600-700[degrees]C showed a 1D nanorod morphology with an average diameter in the range 450-150nm, and length in the range 3-6[mu]m. Well-aligned, uniform and elongated nanorods were obtained at 700[degrees]C. The photoluminescence (PL) spectra showed that undoped ZnO nanorods exhibited a strong and sharp ultraviolet (UV) band edge emission peak at 380nm (3.26eV), whereas Pb-doped ZnO nanorod arrays exhibited a relative weak ultraviolet (UV) emission at 380nm and a strong green emission at 515nm (2.41eV). A mechanism for the nanorod growth and defect emission is proposed. Author Affiliation: (a) Department of Physics, University of the Free State (Qwaqwa campus), Private Bag x13, Phuthaditjhaba 9866, South Africa (b) Department of Materials Science and Engineering, National Taiwan University of Science and Technology, Taipei 10607, Taiwan Article History: Received 31 October 2014; Revised 17 December 2014; Accepted 5 January 2015 Article Note: (miscellaneous) Communicated by: Prof. K. Nakajima
    Keywords: Photoluminescence – Methods ; Photoluminescence – Optical Properties ; Photoluminescence – Analysis ; Oxidation-Reduction Reactions – Methods ; Oxidation-Reduction Reactions – Optical Properties ; Oxidation-Reduction Reactions – Analysis
    ISSN: 0022-0248
    Source: Cengage Learning, Inc.
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  • 6
    Language: English
    In: Journal of Alloys and Compounds, Sept 5, 2015, Vol.642, p.140(8)
    Description: To link to full-text access for this article, visit this link: http://dx.doi.org/10.1016/j.jallcom.2015.04.103 Byline: Moges Tsega, F.B. Dejene, Dong-Hau Kuo Abstract: * CZTSSe thin films are grown by single step sputtering method from single ceramic target. * The effect of substrate temperatures on CZTSSe film formation is carried out. * The selenized CZTSSe films show better crystallinity. * The properties of CZTSSe thin films depend on Se vaporization temperature. * Large grains size up to 2[mu]m and nearly-stoichiometric CZTSSe were obtained. Article History: Received 2 February 2015; Revised 13 April 2015; Accepted 16 April 2015
    Keywords: Thin Films – Analysis
    ISSN: 0925-8388
    Source: Cengage Learning, Inc.
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  • 7
    Language: English
    In: BMC Public Health, March 26, 2012, Vol.12, p.240
    Description: Background It has been estimated that 430,000 children under 15 years of age were newly infected with HIV in 2008, and more than 71% are living in sub-Saharan Africa. In the absence of intervention to prevent mother-to-child transmission, 30-45% of infants born to HIV-positive mothers in developing countries become infected during pregnancy, delivery and breastfeeding. The aim of this study was to assess infant feeding practice and associated factors of HIV positive mothers attending prevention of mother to child transmission and antiretroviral therapy clinics of Northwest Ethiopia. Methods Institution based cross sectional study was conducted from January to May 2011 among all HIV positive mothers with less than two years old child attending prevention of mother to child transmission and antiretroviral therapy clinics in Gondar Town health institutions. A structured pre-tested questionnaire using interview technique was used for data collection. The data was entered and analyzed using SPSS version 16 statistical package. Results A total of 209 HIV positive mothers were included in the study. Of these, 187 (89.5%) had followed the recommended way of infant feeding practice while significant percentage (10.5%) had practiced mixed breast feeding. In multivariate analysis, disclosure of HIV status with their spouse, insufficient breast milk and occupational status were found to be independently associated (p-value of [less than] 0.05) with recommended infant feeding practice. Lack of resource, stigma of HIV/AIDS, and husband opposition were also obtained as factors that influenced choice of infant feeding options by respondents. Conclusions Higher proportion of respondents used the recommended way of infant feeding practice by WHO as well as by Ethiopian Ministry of Health. However, mixed feeding in the first 6 months of age, an undesirable practice in infant feeding, were reported in this study. Infant feeding education that is aligned to national policy should be strengthened in primary health care, particularly in situations where prevention of mother to child transmission of HIV is prioritized.
    Keywords: Hiv Patients -- Food And Nutrition ; Hiv Patients -- Analysis ; Highly Active Antiretroviral Therapy -- Analysis ; Hiv -- Prevention ; Hiv -- Analysis ; Hiv Infections -- Prevention ; Hiv Infections -- Analysis ; Infants -- Food And Nutrition ; Infants -- Analysis ; Breast Feeding -- Analysis ; Developing Countries -- Analysis ; Disease Transmission -- Prevention ; Disease Transmission -- Analysis
    ISSN: 1471-2458
    Source: Cengage Learning, Inc.
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  • 8
    Language: English
    In: BMC Public Health, March 26, 2012, Vol.12, p.240
    Description: Background It has been estimated that 430,000 children under 15 years of age were newly infected with HIV in 2008, and more than 71% are living in sub-Saharan Africa. In the absence of intervention to prevent mother-to-child transmission, 30-45% of infants born to HIV-positive mothers in developing countries become infected during pregnancy, delivery and breastfeeding. The aim of this study was to assess infant feeding practice and associated factors of HIV positive mothers attending prevention of mother to child transmission and antiretroviral therapy clinics of Northwest Ethiopia. Methods Institution based cross sectional study was conducted from January to May 2011 among all HIV positive mothers with less than two years old child attending prevention of mother to child transmission and antiretroviral therapy clinics in Gondar Town health institutions. A structured pre-tested questionnaire using interview technique was used for data collection. The data was entered and analyzed using SPSS version 16 statistical package. Results A total of 209 HIV positive mothers were included in the study. Of these, 187 (89.5%) had followed the recommended way of infant feeding practice while significant percentage (10.5%) had practiced mixed breast feeding. In multivariate analysis, disclosure of HIV status with their spouse, insufficient breast milk and occupational status were found to be independently associated (p-value of [less than] 0.05) with recommended infant feeding practice. Lack of resource, stigma of HIV/AIDS, and husband opposition were also obtained as factors that influenced choice of infant feeding options by respondents. Conclusions Higher proportion of respondents used the recommended way of infant feeding practice by WHO as well as by Ethiopian Ministry of Health. However, mixed feeding in the first 6 months of age, an undesirable practice in infant feeding, were reported in this study. Infant feeding education that is aligned to national policy should be strengthened in primary health care, particularly in situations where prevention of mother to child transmission of HIV is prioritized.
    Keywords: Hiv Patients -- Food And Nutrition ; Hiv Patients -- Analysis ; Highly Active Antiretroviral Therapy -- Analysis ; Hiv -- Prevention ; Hiv -- Analysis ; Hiv Infections -- Prevention ; Hiv Infections -- Analysis ; Infants -- Food And Nutrition ; Infants -- Analysis ; Breast Feeding -- Analysis ; Developing Countries -- Analysis ; Disease Transmission -- Prevention ; Disease Transmission -- Analysis
    ISSN: 1471-2458
    Source: Cengage Learning, Inc.
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  • 9
    Language: English
    In: BMC public health, 20 February 2014, Vol.14, pp.185
    Description: Enterococci are the most important multidrug resistant organisms associated with immunocompromised patients. Data are lacking about the epidemiology of vancomycin resistant Enterococci (VRE) in Ethiopia. This study aimed to assess the prevalence of VRE, their susceptibility patterns to different antibiotics and associated risk factors in fecal samples of Human Immunodeficiency Virus (HIV) positive and HIV negative clients. A cross sectional study was carried out in a total of 226 (113 HIV positive and 113 HIV negative) clients, from July 1/2013 to September 30/2013 at the University of Gondar Teaching Hospital. Data on socio-demographic characteristics and risk factors were collected with a short interview guided by pre-tested structured questionnaire. The enterococci were isolated and identified from stool sample using standard bacteriological procedures. Kary Bauer disk diffusion method was used to determine the susceptibility patterns of Enterococci isolates. Data were entered and analyzed using SPSS version 20 statistical package. The overall colonization of Enterococci was 88.9% (201/226) of which 11 (5.5%) were VRE. The prevalence of VRE among clients with and without HIV infections were 8(7.8%) and 3(3.1%), respectively. Ninety percent of the Enterococci isolates (181/201) were resistant to two or more antibiotics tested. Isolates of Enterococci recovered from stool samples of HIV infected patients were more resistant to amoxicillin and amoxicillin-calvulinic acid than HIV negative clients (P  0.05). The high prevalence of VRE in this study signals the emergence of VRE in the study area. Prior antibiotic treatment was associated with VRE colonization. Therefore, rational use of antibiotics and more detailed study using phenotypic and genotypic methods are needed.
    Keywords: HIV Infections ; AIDS-Related Opportunistic Infections -- Epidemiology ; Gram-Positive Bacterial Infections -- Epidemiology ; Vancomycin-Resistant Enterococci -- Isolation & Purification
    E-ISSN: 1471-2458
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  • 10
    Language: English
    In: Thin Solid Films, 31 August 2015, Vol.589, pp.712-717
    Description: Single-layered Cu ZnSnSb(S,Se,Te) (CZTASSeTe) thin films were prepared on Mo/glass substrate by radio frequency magnetron sputtering of a self-prepared single ceramic target. Successive selenization for the as-deposited film at a substrate temperature of 200 °C in Se-atmosphere was performed at various temperatures between 400 °C and 600 °C for 1 h. Structural investigation of the grown films revealed single-phase tetragonal structure corresponding to kesterite CZTSSe. All measured samples were found to exhibit p-type conductivity. An improved grain size and crystal quality with suitable atomic ratio [Cu/(Zn + Sb + Sn) = 0.89, Zn/Sn = 1.15, and metal/(S + Se + Te) = 1.02] obtained for CZTASSeTe film selenized at 600 °C. The Hall concentration increased from 1.06 to 5.8 × 10 cm , mobility increased from 2.82 to 44.3 cm V s , and resistivity decreased from 20.92 to 0.24 Ω cm as the precursor film is selenized to 600 °C. An enhanced Hall mobility can be ascribed to the larger grains with better crystallinity and composition in the selenized film at 600 °C. Our large grain size and maximized mobility for CZTASSeTe film at the selenization temperature of 600 °C from single ceramic target can be useful for the fabrication of the CZTASSeTe absorber layer.
    Keywords: Cu2znsnsb(S,Se,Te)4 ; Ceramic Target ; Rf Sputtering ; Selenization ; Engineering ; Physics
    ISSN: 0040-6090
    E-ISSN: 1879-2731
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