1,771 research outputs found
Inheritance of Radiation Induced Sterility in Males of the Oriental Fruit Moth, Grapholitha Molesta Busck., (Lepidoptera: Tortricidae)
No full textAbstract GENCHEV, N. P. and E. M. GENCHEVA, 2006. Inheritance of radiation induced sterility in males of the Oriental fruit moth, Grapholitha molesta Busck., (Lepidoptera:Tortricidae). Bulg. J. Agric. Sci, Results of studies on the inheritance of radiation induced sterility in males of Grapholitha molesta Busck. are reported. The partially sterilizing effect of gamma radiation on irradiated as pupae male parents is characterized with moderate increase in parallel with the dose increase. The adult emergence from irradiated pupae, longevity of moths and sex ratio were not affected by the applied radiation doses. Female moths are more radiosensitive than males. The highest level of inherited sterility in males of F 1 generation was established after irradiation of their parents with dosage of 125 Gy. However, some decrease of this effect was observed in the variants with doses of 175 Gy and 200 Gy. The transmission of inherited sterility from F 1 males to their F 2 descendants is a slighter, but still perceptable process. The highest levels of inherited sterility were registered in the variants with dosages of 125 Gy and 150 Gy, but somewhat reduced effect was recorded for doses of 100, 175 and 200 Gy.Progeny of F 1 and F 2 males OFM manifested sex ratios significantly skewed in favor of male moths. As it seems, these sex ratio shifts are results of a dose-dependent process
O Relacionamento fornecedor-cliente no contexto de manufatura enxuta: estudo de caso no setor metal-mecânico
No full textDissertação (mestrado) - Universidade Federal de Santa Catarina, Centro Tecnológico, Programa de Pós-Graduação em Engenharia de Produção, Florianópolis, 2011O termo relacionamento colaborativo ou de parceria/enxuto tem sido utilizado para designar um novo padrão de comportamento na relação cliente-fornecedor. Caracterizado por uma relação mais próxima, de interdependência entre as partes, maior transparência, visão de longo prazo e compartilhamento de riscos e benefícios, esse tipo de relacionamento, em oposição ao tradicional, pressupõe tanto envolvimento econômico quanto social. Por meio de um estudo de caso com fornecedores de uma empresa do setor metal-mecânico, buscou-se identificar os relacionamentos mantidos entre oito fornecedores e seus clientes participantes de uma cadeia de abastecimento de Manufatura Enxuta. Esses fornecedores foram escolhidos por terem participado de um programa de Manufatura Enxuta promovido pelo cliente do setor metal-mecânico nos anos de 2008 e 2009. Verificou-se que o relacionamento mantido entre os clientes e os fornecedores tem um foco principalmente econômico, ou seja, busca a eficiência e a eficácia. Embora muitas práticas e características identificadas em uma parceria/enxuto estejam presentes nos casos analisados, ainda não há uma clara preocupação com o fortalecimento da relação propriamente dita, ou seja, uma verdadeira parceria de longo prazo. A manutenção de uma base maior de fornecedores pelo cliente, a necessidade de investimentos em ativos pelo fornecedor para atender aos requisitos do cliente e a visão de curto prazo fazem parte do comportamento da díade no contexto analisado. Esse tipo de enfoque pode gerar insatisfação no relacionamento, principalmente da perspectiva dos fornecedores
Stara Zagora’da Kahve Satışlarının Pazar Araştırması
No full textThe present survey has been performed with the purpose of evaluating the extent to which the product coffee has entered the Bulgarian market. The article also aims to establish the consumer preferences and the tendencies of development of the coffee market in the city of Stara Zagora. The survey itself was performed in the period July-August, 2005. The people who took part in it were 61 women and 60 men. The authors are trying to define the profiles of the coffee consumers, as well as the relative importance of the different demographic groups for the companies which are the producers. Hypotheses of the research: (1) Is segmentation of the coffee market possible? (2) Is it true that there are a few brands of coffee and they are preferred by the greater part of the consumers? (3) Are the taste and the quality of the coffee of primary importance for the consumers? The market research gives information referring to the following results. The analysis of the data received leads us to the following information, as to the inclinations of the people drinking coffee; the women between 26 and 35 years of age are the most important market segment and differ considerably from the other groups that were involved in the survey, in terms of their monthly consumption quantities. Almost half of the women drink their coffee at home, while the favourite place of the men is the café– the share being 44,3%. The detailed analysis of the survey results shows that the leader on the Bulgarian market is Nova Brazilia with 28,1%, and the second place is for Lavazza with 23,1%. For both men and women the most important characteristics of the product are: 1 – the taste of the coffee, 2 – quality, etc.Çalışma Bulgaristan pazarında kahve boyutlarının değerlendirilmesi amacıyla gerçekleştirilmiştir. Makalenin amacı Stara Zagora şehrinde kahve pazarının gelişme eğilimleri ve tüketici tercihlerini belirlemektir. Temmuz-Ağustos 2005 döneminde gerçekleştirilmiştir. 61 kadın ve 61 erkek tüketici çalışmaya katılmıştır. Çalışmada kahve tüketicilerinin profillerini belirlemenin yanında kahve üreticisi firmaların farklı demografik grupların bağlantılı önemi de ortaya konmaya çalışılmıştır. Araştırmanın Hipotezleri: (1) Kahve pazarını bölümlere ayırmak mümkün müdür? (2) Tüketicilerin büyük bir bölümü tarafından birkaç marka kahve markasının tercih edildiği doğru mu? (3) Tüketiciler için en önemli kriterler kahvenin kalitesi ve tadı mı? Pazar araştırmasıyla şu bilgilere ulaşılmıştır: Aylık tüketim miktarı açısından, 26-35 yaş arasındaki bayanlar en önemli pazar segmentini oluşturmaktadırlar. Bayanların neredeyse yarısı kahveyi evde içmekte iken erkeklerin favori mekânları cafelerdir (% 44,3). Araştırma sonuçlarının detaylı analizi göstermiştir ki; Nova Brazilia %28,1’le Pazarın lideri iken, Lavazza % 23,1 ile ikinci sırada yer almaktadır. Hem kadınlar hem de erkekler için kahvenin en önemli karakteristiği kahvenin tadı ve kalitesidir
Modeling of electroluminescence in InSb quantum wells and inversion asymmetric effects
No full textThe main focus of the dissertation is description, modeling and understanding of the mechanisms underpinning electroluminescence from quantum wells. The dissertation contains original contribution of methodological and phenomenological character. We have described in detail the eight band model within the envelope function approximation(EFA) using the Löwd in perturbation method used for band structure calculations. Although not novel, a detailed derivation of this is rarely done in the literature. We have derived a theoretical expression for electroluminescence spectral emittance based entirely on quantum mechanical model, unlike the more usual semi classical models used in semiconductor physics. The final expression for the spectral emittance has a different dependence compared to the semi classical expression, namely the prefactor in the newly derived expression is proportional to 2 . We use the combination of 8 band EFA method and the newly derived expression for spectral emittance to interpret experimental measurements on unpolarized spectral emittance from several InSb/AlxIn1-xSbquantum wells. We do that using slightly novel procedure and identify several transitions unreported in InSb/AlxIn1-xSb material system up to now. In simplified models these are regarded as forbidden. We show that in 8 band EFA model there aren’t any forbidden transitions. Instead all transitions are allowed and we discuss the product of momentum matrix elements and 2D density of states, to which we refer as "generalized selection rule", as the quantity which determines the strength of the individual transitions in different energy ranges. Furthermore we discuss three groups of mechanisms which determine various properties of the electroluminescence spectrum. These groups are entirely general to electroluminescence from all sorts of quantum wells. They are: (i) band structure embodied in the "generalized selection rules" ; (2) broadening effects and (3) statistical effects. Very important are the effects of structure inversion asymmetry (SIA) on the "generalized selection rules" and the spectral emittance, which we describe and explain. Finally we discuss aspects of two other major themes related to the two characteristic properties of InSb:(i) the broken space inversion invariance and (ii) the relativistic correction of spin-orbit coupling
MODELS IN SUPPLY CHAIN MANAGEMENT IN ANIMAL HUSBANDRY
No full textSupply chain management is a critical aspect of conducting any business. In this article, we provide an overview of some the methods for supply management and their use in animal husbandry. In this paper, we introduce a version of Wilson`s model. The illustration of the proposed model, showing economic effects to the farm, reducing its expenses (by 2.5%) compared to farms that do not utilize this model
Market research of the coffee sales in stara zagora
No full textÇalışma Bulgaristan pazarında kahve boyutlarının değerlendirilmesi amacıyla gerçekleştirilmiştir. Makalenin amacı Stara Zagora şehrinde kahve pazarının gelişme eğilimleri ve tüketici tercihlerini belirlemektir. Temmuz-Ağustos 2005 döneminde gerçekleştirilmiştir. 61 kadın ve 61 erkek tüketici çalışmaya katılmıştır. Çalışmada kahve tüketicilerinin profillerini belirlemenin yanında kahve üreticisi firmaların farklı demografik grupların bağlantılı önemi de ortaya konmaya çalışılmıştır. Araştırmanın Hipotezleri: (1) Kahve pazarını bölümlere ayırmak mümkün müdür? (2) Tüketicilerin büyük bir bölümü tarafından birkaç marka kahve markasının tercih edildiği doğru mu? (3) Tüketiciler için en önemli kriterler kahvenin kalitesi ve tadı mı? Pazar araştırmasıyla şu bilgilere ulaşılmıştır: Aylık tüketim miktarı açısından, 26-35 yaş arasındaki bayanlar en önemli pazar segmentini oluşturmaktadırlar. Bayanların neredeyse yarısı kahveyi evde içmekte iken erkeklerin favori mekânları cafelerdir (% 44,3). Araştırma sonuçlarının detaylı analizi göstermiştir ki; Nova Brazilia %28,1’le Pazarın lideri iken, Lavazza % 23,1 ile ikinci sırada yer almaktadır. Hem kadınlar hem de erkekler için kahvenin en önemli karakteristiği kahvenin tadı ve kalitesidir
Assessing reverse logistics complexity: Conceptual model, scale development, and a case study.
No full textPaper three represented a case study at one of the biggest computer wholesale distribution companies in the USA. Under conditions of anonymity, the reverse logistics program development and implementation was studied in detail. Relevant information was collected through interviews with reverse logistics personnel at different positions within the company; from the general manager of the distribution center and the reverse logistics manager to reverse logistics supervisors directly involved in day-to-day operations. Important implications in terms of reverse logistics program development and implementation were the major contributive outcomes of this final research paper of the dissertation.The current dissertation examines a specific area of the supply chain, i.e., reverse logistics. More companies recognize the potential of reverse logistics as a powerful source of competitive differentiation. At the same time, research on the topic remains scattered at best. Some crucial issues related to developing modern reverse logistics programs remain largely unaddressed. Questions such as where to focus investments in returns management to achieve superior performance, how to ensure that firms build the right set of reverse logistics capabilities, and what specific competencies are required in the process, lack theory-based answers. The Resource Based View of the firm (Barney, 1991; Wernerfelt, 1984) is applied as the theoretical framework of investigation. The conceptual model is strengthened by empirical data collected at six companies directly involved in reverse logistics operations. The balance between theory and practice defines the format of the research project.The dissertation follows a three paper format. The first paper is conceptual in nature and offers a framework for investigating the major factors that affect reverse logistics program development and implementation within the Resource Based View of the firm. Based on information from interviews with returns executives the need for formalizing the program was identified as top priority. Particular emphasis is placed on the formalization of the reverse logistics related processes which bridge resource allocation decisions to building enhanced reverse logistics capabilities toward superior reverse logistics program performance. Determining the level of reverse logistics process formalization became the logical following point.The second paper developed a reverse logistics process formalization assessment tool. The development effort was based on literature review and information gathered from in-depth interviews with logistics personnel at six companies. Strong managerial implications followed in terms of reducing the complexity of returns management by increasing the level of formalization. The relationship was confirmed in the last paper among other relevant to reverse logistics information
Raman Spectroscopy of Mackinawite FeS in Anodic Iron Sulfide Corrosion Products
No full textRaman spectroscopy in a confocal microscope was used to study electrochemically synthesized corrosion products from sour gas experiments. When exposed to oxygen-containing atmosphere, the initial mackinawite FeS corrosion product transformed under laser irradiation to hematite, Fe2O3. Measurements with a thin water layer on top of the corrosion products prevented the transformation, as drying was prevented. In situ Raman measurements of mackinawite formation avoided the problem of transformation completely. In situ and operando, the initially formed mackinawite showed two Raman peaks in the wavenumber range > 180 cm− 1 centered around 200–215 cm− 1 and 285–300 cm− 1. On an empirical basis, these modes were assigned to a B1g mode of the iron sublattice and an A1g mode of the sulfur sublattice, respectively. A comparison with a literature assignment for aged mackinawite suggests that the aging observed involves significant changes in the sulfur sublattice.© The Author(s) 2016. Published by ECS. This is an open access article distributed under the terms of the Creative Commons Attribution 4.0 License (CC BY, http://creativecommons.org/licenses/by/4.0/), which permits unrestricted reuse of the work in any medium, provided the original work is properly cited
Nuclear structure studies in mirror nuclei
No full textThe nuclear structure of the A=31 and A=47 mirror couples produced by two fusion evaporation reactions has been elaborated, utilizing the Doppler-shift attenuation method. Excited states in 31P and 31S were populated using the 1p and 1n exit channels, respectively, of the reaction 20Ne + 12C, while in 47Cr and 47V couple excited states were populated based on 28Si + 28Si reaction, as products of 2an and 2ap exit channels. The A=31 mirror couple was studied utilizing Piave-Alpi accelerator of the Laboratori Nazionali di Legnaro with GASP multidetector array and for A=47 one - with the EUROBALL array using XTU Tandem also in Legnaro. In both cases the lifetime measurements in mirror couples at the same experiment open possibilities for investigations of isospin symmetry. Determined B(E1) strengths in the mirror nuclei 31P and 31S allow to extract the isoscalar component, which can reach up to 24% of the isovector one. The B(E1) values can be modeled by the Equation of motion method. In the case of A=47 mirror couple, the quadrupole moments can be described by shell-model calculations
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