scholarly journals The design of a practical high-speed computing machine. The EDSAC

1948 ◽  
Vol 195 (1042) ◽  
pp. 274-279 ◽  
Keyword(s):  
High Speed ◽  
Relaxation Methods ◽  
Mathematical Equations ◽  
Mathematical Laboratory ◽  
Fundamental Equations ◽  
Physical Laws ◽  
The University ◽  
Computing Machines ◽  
Conventional Type ◽  
Made In

I would like to give a description of the high-speed electronic digital calculating machine now in an advanced stage of construction in the University Mathematical Laboratory, Cambridge, and known as the EDSAC (Electronic Delay Storage Automatic Calculator). Before doing this I will set forth some of the considerations underlying its design. It will be realized that the potential power of electronic digital computing machines is very great, and that they are likely to have a far-reaching effect on certain fields of scientific research. It is, for example, often possible to write down the mathematical equations governing a situation but not possible to treat them analytically. If any progress is to be made in these cases it must be by a direct numerical attack on the fundamental equations. There have in recent years been a number of examples of this method. I might mention Professor Hartree’s work on self-consistent fields and Professor Southwell’s relaxation methods. In both cases the equations expressing the physical laws appropriate to the problem are written down and an approximate numerical solution sought without any intervening analysis of the conventional type. This kind of method is in principle of wide application and power, and the reason why it has not been more generally applied is that the labour of carrying out the necessary numerical processes is too great

Recasting the Fay-Riddell formulae for computing the stagnation point heat flux

2000 ◽  
Vol 214 (2) ◽  
pp. 115-120 ◽  
Author(s):  
G Zuppardi ◽  
A Esposito
Keyword(s):  
Heat Flux ◽  
Stagnation Point ◽  
High Speed ◽  
Operating Conditions ◽  
Navier Stokes ◽  
Total Enthalpy ◽  
High Enthalpy ◽  
Computing Procedure ◽  
The University ◽  
Made In

The Fay-Riddell formulae, used to compute the heat flux at the stagnation point of spherical bodies in very high speed, laminar flow and dissociating air, have been revived and recast. As these formulae were obtained by fitting a number of results of the original Fay-Riddell computing procedure, which suffered from inaccuracies concerning operative parameters, it is to be expected that these inaccuracies also influence the correctness of the formulae. A sensitivity analysis has been made in order to identify the most critical parameter. Recast formulae have been calibrated using the results of the improved version of the Fay-Riddell computing procedure and then validated both by numerical results of a Navier-Stokes code and by experimental data. For this purpose two sets of heat flux measurements have been made in HEBDAF (high enthalpy blown-down arc facility) at the University of Naples, matching the operating conditions of the formula for a frozen boundary layer and non-catalytic wall. Recast formulae are valid in the range of free-stream total enthalpy between 3 and 37 MJ/kg.

scholarly journals 120 HZ Variations in Sky Brightness Over Vancouver, BC

1991 ◽  
Vol 112 ◽  
pp. 99-99
Author(s):  
David Crabtree ◽  
David Westpfahl ◽  
Harvey Richer
Keyword(s):  
British Columbia ◽  
Fourier Analysis ◽  
Direct Observation ◽  
High Speed ◽  
Data Sets ◽  
University Of British Columbia ◽  
Photometric Observations ◽  
Sky Brightness ◽  
The University ◽  
Made In

ABSTRACTWe have detected a component of sky brightness varying with a frequency of 120 Hertz during high speed photometric observations of 40 Eridani with the 30-cm telescope of the University of British Columbia. The observations were made in 1974, but only recently has their significance to the field of urban illumination been realized. The 120 Hertz component was detected by Fourier analysis of data sets of the star and of the sky alone. We confirmed that the 120 Hertz component was due to urban lighting by direct observation of a “standard source,” a lamp on the campus.

scholarly journals Microscopy for Children

2006 ◽  
Vol 14 (3) ◽  
pp. 53-53
Author(s):  
Caroline Schooley
Keyword(s):  
The United States ◽  
Educational Materials ◽  
Real Science ◽  
Curriculum Research ◽  
Early Decision ◽  
National Reputation ◽  
Science Educators ◽  
The University ◽  
Lawrence Hall Of Science ◽  
Made In

Precollege science education in the United States is not what it could, and should, be. Major changes are being made in the way science is taught, but delivering those changes to thousands of schools is an enormous task. Scientific societies are a major resource; they can organize and train member-volunteers to help teachers bring “real” science to the classroom. The Microscopy Society of America has become part of the effort with Project MICRO (Microscopy In Curriculum - Research Outreach). MICRO is putting MSA members, teaching materials, and microscopes in middle school classrooms nationwide. The idea began in 1993, but it has taken a lot of time and effort to implement.MSA's early decision to collaborate with experienced science educators at the Lawrence Hall of Science of the University of California at Berkeley was a wise one; their educational materials have a well-earned national reputation for excellence.

Paper 23: The Collision of Drops with Dry and Wet Surfaces in an Air Atmosphere

1969 ◽  
Vol 184 (7) ◽  
pp. 57-63
Author(s):  
G. J. Parker ◽  
E. Bruen
Keyword(s):  
Steam Turbine ◽  
High Speed ◽  
Size Range ◽  
Drop Surface ◽  
Wet Steam ◽  
Air Atmosphere ◽  
Made In

This paper describes an investigation into the behaviour of drops which impinge upon dry and wet surfaces. This is of particular interest in the context of the wet steam turbine. Two approaches have been made in the studies; these are: (1) Drops were made to impinge normally on to various types of dry, stationary surfaces. The drops were in the size range 300–1500 μm diameter with velocities of 2–9 m/s. (2) Drops were made to impinge on to surfaces moving with considerable velocity at right angles to the motion of the drop. Surface velocities ranged up to 45 m/s. The latter study is of direct interest for the splashing of drops on turbine casings at small glancing angles, as occurs near drainage belts. Analysis of the mechanisms involved is made from the records of high-speed ciné photography.

scholarly journals Self-splitting Abelian groups

2001 ◽  
Vol 64 (1) ◽  
pp. 71-79 ◽  
Author(s):  
P. Schultz
Keyword(s):  
Abelian Group ◽  
Direct Product ◽  
Free Module ◽  
Research Report ◽  
Original Form ◽  
Original Research ◽  
Direct Sum ◽  
The University ◽  
Torsion Free ◽  
Made In

G is reduced torsion-free A belian group such that for every direct sum ⊕G of copies of G, Ext(⊕G, ⊕G) = 0 if and only if G is a free module over a rank 1 ring. For every direct product ΠG of copies of G, Ext(ΠG,ΠG) = 0 if and only if G is cotorsion.This paper began as a Research Report of the Department of Mathematics of the University of Western Australia in 1988, and circulated among members of the Abelian group community. However, it was never submitted for publication. The results have been cited, widely, and since copies of the original research report are no longer available, the paper is presented here in its original form in Sections 1 to 5. In Section 6, I survey the progress that has been made in the topic since 1988.

scholarly journals Training in Astronomy

1998 ◽  
Vol 11 (2) ◽  
pp. 910-911
Author(s):  
M. Gerbaldi
Keyword(s):  
Science Education ◽  
Theoretical Models ◽  
Public Understanding Of Science ◽  
Public Understanding ◽  
Primary Science ◽  
University Colleges ◽  
University Level ◽  
Understanding Of Science ◽  
Physical Laws ◽  
The University

Astronomy offers a unique opportunity for promoting the science teaching in its present crisis. Astronomy can be introduced at various levels and become the medium by which both primary science education and public understanding of science are stimulated.At the University level, astronomy can be introduced in the curricula of university colleges and be a subject for M.Sc. and Ph.D. degrees. Astronomy, can give students the opportunity to work scientifically from observations and known physical laws in order to derive knowledge in another field of science. Astronomy can be taught with less formalism and more experimentation, giving students a feel for the link between a phenomenon and its theoretical representation, and how and why a given observation can be represented by different theoretical models.

Performance of Strongly Bowed Stators in a Four-Stage High-Speed Compressor

2004 ◽  
Vol 126 (3) ◽  
pp. 333-338 ◽  
Author(s):  
Axel Fischer ◽  
Walter Riess ◽  
Joerg R. Seume
Keyword(s):  
Mass Flow ◽  
High Speed ◽  
Static Pressure ◽  
Pressure Ratio ◽  
Axial Compressor ◽  
Pressure Rise ◽  
Maximum Pressure ◽  
Controlled Diffusion ◽  
Stage 4 ◽  
The University

The FVV sponsored project “Bow Blading” (cf. acknowledgments) at the Turbomachinery Laboratory of the University of Hannover addresses the effect of strongly bowed stator vanes on the flow field in a four-stage high-speed axial compressor with controlled diffusion airfoil (CDA) blading. The compressor is equipped with more strongly bowed vanes than have previously been reported in the literature. The performance map of the present compressor is being investigated experimentally and numerically. The results show that the pressure ratio and the efficiency at the design point and at the choke limit are reduced by the increase in friction losses on the surface of the bowed vanes, whose surface area is greater than that of the reference (CDA) vanes. The mass flow at the choke limit decreases for the same reason. Because of the change in the radial distribution of axial velocity, pressure rise shifts from stage 3 to stage 4 between the choke limit and maximum pressure ratio. Beyond the point of maximum pressure ratio, this effect is not distinguishable from the reduction of separation by the bow of the vanes. Experimental results show that in cases of high aerodynamic loading, i.e., between maximum pressure ratio and the stall limit, separation is reduced in the bowed stator vanes so that the stagnation pressure ratio and efficiency are increased by the change to bowed stators. It is shown that the reduction of separation with bowed vanes leads to a increase of static pressure rise towards lower mass flow so that the present bow bladed compressor achieves higher static pressure ratios at the stall limit.

ACCURACY ANALYSIS OF DIFFERENT SURFACE RECONSTRUCTION MODELLING METHODS FOR HERITAGE OBJECTS DIGITIZED CONSIDERING PHOTOGRAMMETRIC DATA / SKIRTINGŲ RELJEFO MODELIAVIMO METODŲ, SUDARYTŲ PAGAL PAVELDO OBJEKTO FOTOGRAMETRINIUS DUOMENIS, TIKSLUMO ANALIZĖ / АНАЛИЗ ТОЧНОСТИ РАЗНЫХ МЕТОДОВ МОДЕЛИРОВАНИЯ ПОВЕРХНОСТИ, СОСТАВЛЕННЫХ В СООТВЕТСТВИИ С ФОТОГРАММЕТРИЧЕСКИМИ ДАННЫМИ ОБЪЕКТА АРХИТЕКТУРНОГО НАСЛЕДИЯ

2011 ◽  
Vol 37 (2) ◽  
pp. 56-62
Author(s):  
Jūratė Sužiedelytė-Visockienė ◽  
Aušra Kumetaitienė ◽  
Renata Bagdžiūnaitė
Keyword(s):  
Initial Data ◽  
Surface Reconstruction ◽  
Digital Images ◽  
Digital Camera ◽  
Accuracy Analysis ◽  
Triangulated Irregular Network ◽  
Modelling Analysis ◽  
The University ◽  
Modelling Methods ◽  
Made In

The article explains the possibilities of reconstructing heritage objects. Measurements were made using photogrammetric data received from digital images taken by the Canon EOS 1D Mark III digital camera calibrated in the Institute of Photogrammetry at the University of Bonn (Germany). The images were received applying the PhotoMod photogrammetric software produced in Russia. TIN (Triangulated Irregular Network) and an orthophoto map were made in the investigated objects. The modelling analysis of TIN data was made using ArcGIS software. The purpose of the article is to reconstruct the surface of heritage objects referring to photogrammetric data, to investigate accuracy dependence of heritage object reflection on the methods of preparing the initial data and to evaluate the influence of modelling methods on to the accuracy of reconstructing heritage objects when modelling photogrammetric data and selecting the most appropriate method of modelling parameters to restore the most accurate surface of the heritage object. Santrauka Straipsnyje aprašomos paveldo – architektūrinio objekto paviršiaus modeliavimo galimybės. Modeliavimas atliktas pagal fotogrametrinius objekto duomenis–skaitmenines nuotraukas, darytas kalibruota fotokamera Canon EOS 1D Mark III. Kamera kalibruota Bonos universiteto Fotogrametrijos institute (Vokietija). Objekto nuotraukos apdorotos fotogrametrine kompiuterine programa PhotoMod (Rusija). Sudaryta objekto ortofotografinė nuotrauka ir, parenkant skirtingus duomenų šaltinius, paviršiaus TIN (triangulated irregular network). Skirtingais metodais, naudojantis ArcGIS programa, atliktas fotogrametrinių TIN duomenų modeliavimas ir gauti objekto paviršiaus vaizdai. Įvertintas rezultatų tikslumas ir kokybė. Резюме Описываются возможности моделирования поверхности объекта архитектурного наследия. Моделирование осуществляется с использованием фотограмметрических данных объекта – цифровых снимков, снятых калибрированной цифровой камерой Canon EOS 1D Mark III. Камера калибрирована в Институте фотограмметрии Боннского университета (Германия). Снимки объекта обработаны по фотограмметрической компьютерной программе PhotoMod (Россия). Cделан ортофотографический снимок объекта и с помощью разных источников данных TIN (Triangulated Irregular Network) поверхности. Используя программу ArcGIS, разными методами проведено моделирование фотограмметрических TIN данных и получены изображения поверхности объекта. Осуществлена оценка точности и качества результатов.

scholarly journals 9 Degrees North: The ABCs of North Ghana

2013 ◽  
Vol 2 (4) ◽  
Author(s):  
Nicole Dalmer
Keyword(s):  
Red Deer ◽  
Public Libraries ◽  
Farm Animals ◽  
Northern Ghana ◽  
School Students ◽  
University Of Alberta ◽  
Northern Regions ◽  
The University ◽  
Made In

Tools for Schools Africa Foundation. 9 Degrees North: The ABCs of North Ghana. Red Deer, Alberta: Tools for Schools Africa Foundation, 2011. Print. Since 2003, Tools for Schools Africa Foundation has been working to increase educational opportunities in northern Ghana. A registered charity based out of Red Deer, Alberta, they have been working to advance the quality of life of those living in the northern regions of Ghana by improving access to post-primary education. One of their recent projects includes the publication of an ABC book for primary school students. 9 Degrees North: The ABCs of North Ghana is an amazing piece of beautiful artistry; each letter colourfully depicting animals, activities, plants, traditions, history and other aspects of Ghanaian life. Each of the 26 letters is illustrated by a different artist, allowing readers to be introduced to a variety of artistic mediums, including oils, pastels, watercolours and pencil. The artistry from letter to letter is unique, featuring different uses of colour and technique, yet each image is consistently impressive. The accessible and well-written sentences that accompany each illustration introduce readers to Bolga baskets (grass baskets made in Bolgatanga), Kapok trees (used by people and farm animals for its shade), Oware (the national game of Ghana), and the Black Volta River (full of crocodiles) amongst many other interesting facts and features about this country. In addition to the few sentences used to explain the illustrations associated with each of the 26 letters, there is a detailed appendix with additional facts about the object or focus of each letter which could serve as a useful teaching tool for using this book in the classroom. The appendix also includes several additional photographs and paintings of Ghana. 9 Degrees North: The ABCs of North Ghana is highly recommended for elementary school libraries as well as public libraries. With its varied and vibrant illustrations, and with proceeds from the sale of this book supporting scholarships for girls in northern Ghana, this will also make an excellent addition to any reader’s collection. Highly recommended: 4 out of 4 stars Reviewer: Nicole Dalmer Nicole Dalmer is a Public Services Librarian at H.T. Coutts Education & Physical Education Library at the University of Alberta. She is interested in health literacy, pinball, and finding the perfect cup of coffee to accompany a good read.

scholarly journals Designing the pedagogical design of the educational environment of the university

2021 ◽  
pp. 156-162
Author(s):  
Elena V. Shirinkina ◽  
Keyword(s):  
High Speed ◽  
Educational Environment ◽  
Educational Process ◽  
Practical Significance ◽  
Educational Institutions ◽  
International Studies ◽  
Corporate University ◽  
Pedagogical Design ◽  
Integral Element ◽  
The University

The relevance of the research is due to the fact that the educational environment of the university is an integral element of the educational process, which is constantly changing, even at a fairly high speed. In this regard, pedagogical design in such conditions concerns not only educational programs, but also the environment itself. The author considers a new category «pedagogical design», defines how the pedagogical designer differs from the methodologist or methodologist; Why is a pedagogical design design mechanism needed? The empirical basis of the study was the data of international studies by Deloitte «Digital Education Survey», Goldman, EFMD, Metaari, Technavio, as well as data from domestic studies by HR-academy and the Sberbank Corporate University. The novelty of the research lies in the fact that the author presents a mechanism for designing the pedagogical design of the educational environment of the university, based on obtaining, comprehending, checking one’s own experience and analyzing best practices. The practical significance of the study lies in the fact that the results obtained will allow educational institutions to structure their work in such a way as to calmly relate to changes, responding to requests from the labor market, while making changes made the training solution the most effective.

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