1,098 research outputs found
Solution of the problem of composite charge using R.D.38
No full textIn this paper the author has solved the problem of internal ballistics of composite charge using 'R.D.38' method which is based upon the usual isothermal approximation. A linear law of burning has been assumed
Author index
No full textThe articles have been scanned in colour with a HP Scanjet 5590; 300dpi.
Adobe Acrobat XI Pro was used to OCR the text and also for the merging and conversion to the final presentation PDF-format.This is a continuation of the "Author and Subject Index to the Onderstepoort Journal
of Veterinary Science and Animal Industry (1933- l950)" and the "Onderstepoort Journal
of Veterinary Research (1951 - 1968)" which appeared in June 1969 and covers the period
1969 to 1973, i.e. Volumes 36 to 40.
As from 1974 (Volume 41) it is intended to furnish an Author and Subject Index
in Number 4 of each volume covering all four numbers for that particular year
Noise due to unsteady flow past trailing edges
No full textThis paper presents two-dimensional direct numerical simulations (DNS) of noise generated at trailing edges (TE) with zero thickness. The simulations are conducted specifying either no-slip or slip walls in order to investigate viscous effects. In both cases, small amplitude disturbances are introduced close to the inflow boundary that serve as pressure disturbances at the TE. DNS data reveals that the unsteady Kutta condition is not satisfied, irrespective of the wall boundary condition. However, it appears that the validity of the unsteady Kutta condition is not essential for making an accurate prediction of the far field noise. The far field pressure is predicted as a function of the surface pressure difference using a 2-D modification of Amiet's classical theory, and compared with the far field pressure computed directly. Directivity plots provide evidence that the presence of boundary layers and noise generated by an unsteady wake in the no-slip cases lead to smearing of individual lobes, and that the downstream pointing lobes in no-slip wall cases are probably due to nonlinear noise generation in the wake. The simulations are conducted using a high-order accurate numerical method which is free of upwinding, artificial dissipation or any form of explicit filtering, and employs a novel boundary treatment
Characteristic distribution and scale interaction of turbulence in a boundary layer
No full textThis work revisits the concept of turbulent boundary layers from a novel perspective on scale transfer. Turbulence production and dissipation together with the energy budgets are analyzed in the velocity gradient invariant phase space. In combination with filtering, the mechanism of scale coupling is investigated and illustrated for different characteristic flow topologies. The understanding of the scale coupling is important to model turbulence. Turbulence models describe the complex interaction of the scales of motion in a simplified form. The essential task of turbulence modeling is to capture the coupling of the modeled and unmodeled scales as well as the evolution of the modeled scales within the unmodeled flow. This work characterizes the scale coupling by focusing on the interfaces between modeled and unmodeled flow such as production and dissipation. The mechanisms that govern the evolution of the modeled quantities are investigated for their core properties and universal features. Direct numerical simulation (DNS) is carried out to obtain data of a compressible zero pressure-gradient flat plate turbulent boundary layer flow. This flow topology allows to unveil the effect of a wall on the coupling of scales and evolution of turbulence
Learning from One's Mistakes
No full textCreated by R.D. Lee for the Royal Statistics Society, this article describes an exercise, which highlights the effect of sampling without replacement in small populations, and leads to consideration of the relative importance of sample and population size when examining standard error. The author provides a number of exercises, an explanation of statistical errors and the importance of sample size. This is a brief, yet fine resource for those in the field of statistics
Mad to be Normal: Thoughts on Psychiatrist R.D Laing and Connections to Liberation Psychology
No full textThis article uses the film Mad to be Normal, about R.D. Laing, as an opening into the liberation psychology approaches of Martin-Baro. Examples from the author\u27s own clinical practice as well as personal experiences from life in a Catholic Worker community are included
R.D. Laing's language of experience
No full textThe radical psychiatrist R.D. Laing (1927-1989) was an accomplished author with an extensive philosophical knowledge that informed his ideas on reading, writing, and interpretation. Laing argues that psychiatry should be modeled on skilful textual exegesis rather than scientific explanation. The exegesis of a psychotic’s words and actions is difficult, he infers, because the impoverishment of our experience cuts us off from the sense that lies within seeming madness. Like philosophers such as Edmund Husserl, Laing therefore criticizes the way in which the natural sciences have invalidated subjective experience. He consequently employs a rhetoric designed to disclose with renewed vigor its complexity, variety and reality. Laing fails, however, to find an alternative to scientific reason: "experience", in his weakest work, is an irrational realm of mystical and self-validating certainty that closely parallels Heidegger’s later accounts of "Being"
World trade organization and the renewable energy sources cases: How to achieve the SDG7?
No full textThis article discusses in detail disputes resolved by the WTO Dispute Settlement Body (hereinafter referred to as the WTO DSB) in the field of state subsidies to support the use of renewable energy sources (hereinafter referred to as the RES). Since 2010, eight cases have been filed with the WTO DSB in relation to RES subsidy programs. The author analyzes the case and shows the impact of increasing the number of such trade disputes on further development of renewable energy in the whole world, and in separate states. The author pays special attention to the achievement of Sustainable Development Goal 7, which were approved by the UN for 2016-2030, in the context of the spread of RES in the context of the conditions of WTO DSB case practice. © 2020, by ASERS® Publishing. All rights reserved
Climate Change Mitigation and Renewable Energy Sources: International Legal Issues
No full textRenewable energy today plays an important role in the decarbonization of the economy and, accordingly, in combating climate change processes. There is no specific international treaty regulating renewable energy sources per se. In the article we analyzed provisions on renewable energy and climate change that are contained in the UNFCCC, Kyoto Protocol, the Statute of International Renewable Energy Agency (IRENA), the Sustainable Energy for All Initiative, the Green Climate Fund, the Paris-Nairobi Climate Initiative, the Paris Agreement on Climate Change and related international climate change negotiations and declarations. At the same time, the practice of resolving disputes of the WTO Dispute Settlement Body shows that subsidizing the development of renewable energy sources is contrary to the WTO law, it is causing some concern. In conclusion, the authors note that a strategic tuning plan for the implementation of the Sustainable Development Goals (2016–2030), which pays considerable attention to improving the efficiency of using renewable energy sources, should be a definite tuning fork for the international community in this regard. The authors also notice the great importance of fulfilling their nationally determined contributions made under the Paris Agreement on Climate Change, and the interdependence and complementarity of the international legal obligations of states under SDG 7 and 13 and the 2015 Paris Agreement. © 2020, Springer Nature Switzerland AG
- …
