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Search Results: 1 - 10 of 540401 matches for " Hull L.M. "
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Characterization of shocked beryllium
Cady C.M.,Adams C.D.,Hull L.M.,Gray G.T.
EPJ Web of Conferences , 2012, DOI: 10.1051/epjconf/20122601009
Abstract: While numerous studies have investigated the low-strain-rate constitutive response of beryllium, the combined influence of high strain rate and temperature on the mechanical behavior and microstructure of beryllium has received limited attention over the last 40 years. In the current work, high strain rate tests were conducted using both explosive drive and a gas gun to accelerate the material. Prior studies have focused on tensile loading behavior, or limited conditions of dynamic strain rate and/or temperature. Two constitutive strength (plasticity) models, the Preston-Tonks-Wallace (PTW) and Mechanical Threshold Stress (MTS) models, were calibrated using common quasi-static and Hopkinson bar data. However, simulations with the two models give noticeably different results when compared with the measured experimental wave profiles. The experimental results indicate that, even if fractured by the initial shock loading, the Be remains sufficiently intact to support a shear stress following partial release and subsequent shock re-loading. Additional “arrested” drive shots were designed and tested to minimize the reflected tensile pulse in the sample. These tests were done to both validate the model and to put large shock induced compressive loads into the beryllium sample.
Influence of sweeping detonation-wave loading on shock hardening and damage evolution during spallation loading in tantalum
Gray G.T.,Hull L.M.,Livescu V.,Faulkner J.R.
EPJ Web of Conferences , 2012, DOI: 10.1051/epjconf/20122602004
Abstract: Widespread research over the past five decades has provided a wealth of experimental data and insight concerning the shock hardening, damage evolution, and the spallation response of materials subjected to square-topped shock-wave loading profiles. However, fewer quantitative studies have been conducted on the effect of direct, in-contact, high explosive (HE)-driven Taylor wave (unsupported shocks) loading on the shock hardening, damage evolution, or spallation response of materials. Systematic studies quantifying the effect of sweeping-detonation wave loading are yet sparser. In this study, the shock hardening and spallation response of Ta is shown to be critically dependent on the peak shock stress and the shock obliquity during sweeping-detonation-wave shock loading. Sweeping-wave loading is observed to: a) yield a lower spall strength than previously documented for 1-D supported-shock-wave loading, b) exhibit increased shock hardening as a function of increasing obliquity, and c) lead to an increased incidence of deformation twin formation with increasing shock obliquity.
The influence of fasting/refeeding on the lipoprotein lipase activity of adipose tissue and muscle
Botion, L.M.;
Brazilian Journal of Medical and Biological Research , 2001, DOI: 10.1590/S0100-879X2001001100006
Abstract: lipoprotein lipase activity in adipose tissue and muscle is modulated by changes in the pattern of food intake. we have measured total lipoprotein lipase activity in adipose tissue and muscle of male wistar rats (n = 6-10), weighing 200-250 g (~12 weeks), during the refeeding/fasting state following 24 h of fasting. lipoprotein lipase activity in tissue homogenates was evaluated using a [3h]-triolein-containing substrate, and released [3h]-free fatty acids were extracted and quantified by liquid scintillation. adipose tissue lipoprotein lipase activity did not completely recover within 2 h of refeeding (60% of refed ad libitum values). cardiac lipoprotein lipase activity remained increased even 2 h after refeeding (100% of refed ad libitum values), whereas no significant changes were observed in the soleus and diaphragm muscles. adipose tissue lipoprotein lipase activities were consistently higher than the highest skeletal muscle or heart values. it is therefore likely that adipose tissue, rather than muscle makes the major contribution to triacylglycerol clearance. there was concomitant relatively high lipoprotein lipase activity in both adipose tissue and cardiac muscle during the first few hours of refeeding, therefore cardiac muscle may contribute significantly to triacylglycerol clearance during this period. the results suggest that during fasting, increased lipoprotein lipase activity provides a complementary source of free fatty acids from circulating triacylglycerol, allowing the heart to maintain its continuous, high-energy expenditure.
Mathematical Analysis of the Correction Factor for Analysing Space Frame under the Action of Horizontal Crane Load
L.M. Olanitori
Journal of Engineering and Applied Sciences , 2012,
Abstract: This research attempts to analytically investigate, the effect of the space nature of an industrial frame building on its strength. The above subject matter is divided into two parts; the mathematical analysis of the correction factor and design procedures of an industrial frame building considering its space nature. This study examines only the first part of the above subject matter that is the analytical investigation of the effect the space nature of an industrial frame building on its strength in the form of a correction factor. The result obtained shows that frame structures are being over loaded if their space nature is not considered, hence, leading to uneconomic design.
Hilos de agua, lazos de sangre: enfrentando la escasez en el desierto de Lavalle (Mendoza, Argentina)
L.M. Torres
Ecosistemas , 2008,
Abstract: En el trabajo se analizan las posibles relaciones existentes entre las dinámicas de uso de los recursos naturales y las estrategias de localización de las unidades domésticas en el territorio, dentro de espacios rurales de desierto que poseen una oferta ambiental limitada. Cómo, en el marco de qué estrategias, los grupos humanos convierten distintas porciones de la naturaleza en recurso natural? y cómo usan y administran esos recursos en procura de asegurar su propia reproducción social? Para avanzar en esta dirección se analiza un estudio de caso (el desierto de Lavalle, provincia de Mendoza, Argentina) y, dentro de él, se procede con las técnicas cualitativas de entrevista en profundidad y observación participante. Los datos que se presentan sugieren que en los territorios analizados rurales, emplazados en tierras secas, afectados por desertificación y con elevados índices de pobreza- las limitaciones que impone el medio ambiente son sobrellevadas en alguna medida- mediante una estrategia de localización íntimamente relacionada con el proceso de producción, que maximiza el acceso de determinados recursos naturales y que "ordena" la competencia por ellos con los vecinos y parientes.
L.M. Fourie
Koers : Bulletin for Christian Scholarship , 2009, DOI: 10.4102/koers.v74i1&2.121
Importance of best Human Resource Management Practices and the need for a Human Resource Information System (HRIS) for the Public Health Sector in Sri Lanka
L.M. Mujeeb
Sri Lanka Journal of Bio-Medical Informatics , 2013, DOI: http://dx.doi.org/10.4038/sljbmi.v3i2.2449
Abstract: Human Resource (HR) management practices are essential for delivering effective healthcare services in hospitals. To maximise the usage of available HR, an effective and prudent HR management policy is essential. Special emphasis is necessary with regard to the HR management of public sector doctors and dental surgeons. A Health Resource Information System (HRIS) is helpful in achieving this. Such a system should be sustainable and affordable.
Main kinds of reward as the most important stimulus for increasing innovation activity of enterprise workers
L.M. Khomenko
Marketing ì Mened?ment Innovacìj , 2011,
Abstract: The main kinds of the reward which have to form a complex reward system at the enterprise are described in the article. Using this complex reward system, the managers of the modern enterprises can increase the workers innovation activity.
Scientifically-applied aspects of management process-oriented on industrial enterprises during realization of reengineering of business processes
L.M. Taranyuk
Marketing ì Mened?ment Innovacìj , 2012,
Abstract: In this article the questions of theoretical base of process-oriented management is considered, features of functional and process management are investigated, pre-conditions and problem moments of introduction of the process-oriented management are certain, applied aspects of introduction of process management on a production during realization reengineering business process are analyses.
Fungal photobiology: a synopsis
L.M. Corrochano
IMA Fungus , 2011,
Abstract: Fungi respond and adapt to many environmental signals including light. The photobiology of fungi has been extensively investigated, but in recent years the identification of the first fungal photoreceptor, WC-1 in the ascomycete Neurospora erassa, and the discovery that similar photoreceptors are required for photoreception in other ascomycete, basidiomycete and zygomycete fungi has allowed the molecular characterization of light reception and the early steps of signal transduction in a number of model fungi. This contribution is based on presentations made at the Special Interest Group Meeting on "Fungal Photobiology" held during IMC9. The contributions summarize the current status of fungal photobiology in Aspergillus nidulans, Neurospora erassa, Mucor eireinelloides, and Coprinopsis cinerea.
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