2,568 research outputs found
Influence of temperature and sliding speed on the subsurface microstructure evolution of EN AW-6060 under sticking friction conditions
No full textThis article may be downloaded for personal use only. Any other use requires prior permission of the author and AIP Publishing. This article appeared in AIP Conference Proceedings 1896, 140012 (2017) and may be found at https://doi.org/10.1063/1.5008168.The microstructure evolution of the friction boundary layer of the aluminum alloy EN AW-6060 was investigated. Sticking friction tests at different temperatures and sliding speeds were carried out. A severe deformation below the friction surface was observed by means of LOM and EBSD mapping. Thus, the thickness variation and the grain structure of the high deformation zone could be described. Fibrous structure was observed at 300 °C and 400 °C, while equiaxed grains with high misorientation angle (>15°) were generated at higher temperatures. Additionally, abnormal grain growth and coarse grains were detected at high sliding speeds (10 mm/s, 42 mm/s) at 450°C and 500 °C respectively
Author-Suggested, Weighted Citation Index: A Novel Approach for Determining the Contribution of Individual Researchers
No full textA novel scientometric index, named ‘author-suggested, weighted citation index’ (Aw-index) is proposed to indicate the scientific contribution of any individual researcher. For calculation of the Aw-index, it is suggested that during the submission of a scholarly article, the corresponding author would provide a statement, agreed upon by all the authors, containing weightage factors against each author of the article. The author who contributed more to the article would secure a higher weightage factor. The summation of the weightage factors of all the authors of an article should be unity. The citation points a researcher receives from a scholarly publication is the product of his/her weightage factor for that article and the total number of citations of the article. The Aw-index of any individual researcher is the summation of the citation points he/she receives for all his/her publications as an author. The Aw-index provides the opportunity to the group of authors of a multi-authored article to determine the quantum of partial citations to be attributed to each of them. Through an illustrative example, a comparison of the proposed index with the major scientometric indexes is presented to highlight the advantages of the Aw-index
Self-consistent field convergence for proteins:a comparison of full and localized-molecular-orbital schemes
No full textEcological analysis of the associations between mortality and major risk factors of cardiovascular diseases.
No full textBACKGROUND:
The WHO Multinational Monitoring of Trends and Determinants in Cardiovascular Disease (MONICA) Project has been established to measure trends in cardiovascular mortality and coronary heart disease and cerebrovascular disease morbidity and to assess the extent to which these trends are related to changes in known risk factors at the same time in defined communities in different countries. This cross-sectional study is based on data from the early part of the Project and assesses the association between mortality and population risk factor levels.
METHODS:
Thirty-five populations of men and women aged 35-64 years are used in correlation analyses between four mortality measures (deaths from all causes, cardiovascular diseases, ischaemic heart disease and stroke) and three cardiovascular risk factors (regular cigarette smoking, blood pressure and total cholesterol).
RESULTS:
In male populations all-causes mortality and stroke mortality had more than 39% of their variance explained by the three risk factors but all cardiovascular and ischaemic heart disease mortality had less than 25% of their variance explained. For female populations each mortality measure except ischaemic heart disease mortality had more than 33% of their variances accounted for by the three risk factors. For both the male and female populations each of the mortality measures shows strong associations with high blood pressure but the associations with smoking and high cholesterol are generally weaker and much less consistent.
CONCLUSIONS:
This analysis has shown that accepted cardiovascular mortality risk factors measured cross-sectionally at the population level do not reflect well the variation in mortality between populations
Influence of Process Parameters on the Quality of Aluminium Alloy EN AW 7075 Using Selective Laser Melting (SLM)
No full textAbstractSelective laser melting (SLM) is an additive manufacturing process, forming the desired geometry by selective layer fusion of powder material. Unlike conventional manufacturing processes, highly complex parts can be manufactured with high accuracy and little post processing. Currently, different steel, aluminium, titanium and nickel-based alloys have been successfully processed; however, high strength aluminium alloy EN AW 7075 has not been processed with satisfying quality. The main focus of the investigation is to develop the SLM process for the wide used aluminium alloy EN AW 7075. Before process development, the gas-atomized powder material was characterized in terms of statistical distribution: size and shape. A wide range of process parameters were selected to optimize the process in terms of optimum volume density. The investigations resulted in a relative density of over 99%. However, all laser-melted parts exhibit hot cracks which typically appear in aluminium alloy EN AW 7075 during the welding process. Furthermore the influence of processing parameters on the chemical composition of the selected alloy was determined
Home and community based parenting support programmes and interventions: report of Workpackage 2 of the DataPrev project
No full textThe last decade has witnessed an increasing interest in the promotion of mental health and wellbeing because of its importance for health and social functioning at the individual level and for the social and economic wellbeing of societies. Recent research from a range of disciplines has highlighted the importance of the quality of the parent-child relationships and parenting on children‟s emotional and social development, and on adult mental health and wellbeing. Intervention studies involving children of all age groups have shown that if parenting can be influenced for the better outcomes can be changed.
The DataPrev project was funded by the 6th Framework of the European Community Research Programme under Policy-Orientated Research with the aim of establishing a database of evidence-based programmes in Europe that promote mental health and wellbeing and prevent mental illness throughout the life course.
This is the report of the Workpackage 2 describing the international evidence base on programmes to support parenting, including home and community based programmes
Zhedanov's Algebra AW(3) and the Double Affine Hecke Algebra in the Rank One Case. II. The Spherical Subalgebra
No full textThis paper builds on the previous paper by the author, where a relationship between Zhedanov's algebra AW(3) and the double affine Hecke algebra (DAHA) corresponding to the Askey-Wilson polynomials was established. It is shown here that the spherical subalgebra of this DAHA is isomorphic to AW(3) with an additional relation that the Casimir operator equals an explicit constant. A similar result with q-shifted parameters holds for the antispherical subalgebra. Some theorems on centralizers and centers for the algebras under consideration will finally be proved as corollaries of the characterization of the spherical and antispherical subalgebra
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Extensions and amplifications of a traffic model of Aw and Rascle
No full textIn a recent paper [1] Aw and Rascle introduced a new model of traffic on a uni-directional highway. Here the author studies an extension of this model, one which accounts for drivers attempting to travel at their maximum allowable speed. The author looks at a Lagrangian reformulation of this problem; a formulation that leads to an effective computational algorithm for solving the resulting system. He also investigates approximation scheme introduced by Dafermos [5] for scalar conservation laws and demonstrates that this Dafermos scheme works well on this 2 x 2 system
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2005 BRAC Commission
No full text2005 Base Realignment and Closure Commission C-130J Update Brief - Col William P. Stewart 43 AW/CC
Automating the determination of wave speed using the pu-loop method
No full textThe PU-loop (pressure-velocity loop) is a method for determining wave speed and relies on the linear relationship between the pressure and velocity in the absence of reflected waves. This linearity of the PU-loop during early systole, which is directly related to wave speed, has always been established by eye. This paper presents a new technique that establishes this linearity and thus determining wave speed online. Pressure and flow were measured in the ascending aorta of 11 anesthetised dogs. The slope of the PU-loop, indicating wave speed was determined by eye and by using the new technique. The difference between the slopes of the two methods is in the order of 3%. The new technique is convenient and allows for the online assessment of wave speed, which could be used as a bedside tool for the assessment of arterial compliance
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