8,023 research outputs found
Past veterinarians in South Africa
No full textAn alphabetical list containing short biographies of all deceased South African veterinarians up to 1990.[compiled by] P.J. (Bill) PosthumusVolume 1: AL -- Volume 2: M-ZAlso available in print http://137.215.9.20/record=b1893606ab2013ab201
Open brief aan den WelEdel. Gestr. Heer P.J. Joubert
No full textleyds-70-7201.pdf created from original pamphlet in the WJ Leyds Collection held in the Africana Section of the Stellenbosch University Library and Information Service.Dutch open letter to P.J. Joubert concerning a railroad concession granted to the author and two of his friends in 1885
Compte-rendu de l'ouvrage de J.E. Costa et P.J. Fleischer : Developments and applications of geomorphology
No full textpeer reviewe
Design, Modeling and Simulation of a 52MHz MEMS Gyroscope Device in 1.5um SOI
No full textIn this thesis , a simulation model of a MEMS gyroscope is presented. The model enables mode matching and analysis of the dynamic behavior of a gyroscope. Furthermore, the model allows the optimization the design parameters of the gyroscope. The simulated gyroscope operates at a frequency of 52MHz with amplitudes of 10nm and quality factor of 50,000. Finally, the drive mode measurements are presented at different bias voltages.Microelectronics & Computer EngineeringElectrical Engineering, Mathematics and Computer Scienc
Morfología del aquenio en las especies del género Scleria P. Berg (Cyperaceae) presentes en Costa Rica
No full textTesis (licenciatura en biología con énfasis en botánica)--Universidad de Costa Rica. Escuela de Biología, 2014Scleria P.J. Bergius es uno de los muchos géneros de plantas vasculares en Costa Rica que han sido poco estudiados a nivel taxonómico. La morfología de su aquenio varía entre las diferentes especies, lo que provee características taxonómicas importantes para distinguirlas independientemente de otros caracteres. El objetivo de esta investigación fue analizar y describir las características morfológicas del aquenio en las especies de Scleria presentes en Costa Rica y elaborar una clave y guía taxonómica que permita la identificación y diferenciación de tales especies. Se analizaron 15 aquenios por especie obtenidos de especímenes de los herbarios de la Universidad de Costa Rica, Instituto Nacional de Biodiversidad, Herbario Nacional y Organización para Estudios Tropicales. Los aquenios se midieron y caracterizaron por medio de un estereoscopio y un microscopio electrónico de barrido. Se tomaron fotografías digitales de la vista completa del aquenio, el detalle de la superficie y la vista superior e inferior del fruto. Con el fin de conocer cuáles especies de Scleria son más similares morfológicamente, se realizó un dendrograma (algoritmo: Single linkage, índice de similitud: Bray Curtis) mediante el programa estadístico Paleontological Statistic. Se elaboró una clave dicotómica para distinguir las 21 especies de Costa Rica considerando únicamente la morfología de los aquenios. Se logró describir morfológicamente los aquenios de todas las especies. En el caso de S. anceps, S. ciliata, S. flagellum-nigrorum y S. vaginata se analizaron menos de 15 frutos, ya que en Costa Rica se conocen solamente uno o dos especímenes. La descripción de S. purdiei se basó en publicaciones previas y en fotografías facilitadas por el herbario del Museo Field de Historia Natural (Chicago, Estados Unidos), debido a que la única muestra costarricense se encuentra en esa institución. Se observó que la variación morfológica entre plantas...UCR::Docencia::Ciencias Básicas::Facultad de Ciencias::Escuela de Biologí
Het gemeentelijk Investeringsraadsel: Het verband tussen gemeentelijke investeringen en lokale welvaartsontwikkeling
No full textDit proefschrift gaat over de vraag in hoeverre in Nederland de lokale welvaartsontwikkeling wordt bepaald door de gemeentelijke investeringsinspanning. Op project niveau is meestal wel het een en ander bekend over de maatschappelijke effecten, maar over de impact van de totale investeringsinspanning ontbreekt zowel fundamentele als toepasbare kennis. Het is een raadsel dat nog opgelost dient te worden. De doelstelling van dit proefschrift is daaraan een bijdrage te leveren.Housing System
Coupled thermo–hydro–mechanical processes for the Dutch radioactive waste repository
No full textDisposal of spent nuclear fuel and long lived radioactive waste in deep clay geological formations is one of the promising options worldwide. In this concept of the geological disposal system, the Boom Clay is considered as a potential host rock when designing a generic waste repository in the Netherlands. For design and evaluation of a repository for geologic disposal of nuclear wastes one of its principal concern is the thermal loading. High-level radioactive waste and spent fuel generate considerable amounts of heat. When those waste types are disposed in a geological repository the elevated thermal effect on the behaviour of soils surrounding nuclear waste disposal give rise to change in hydraulic and mechanical properties is a significant factor for repository design. Understanding these time-dependent phenomena processes in relation to both the effects of pore water dissipation and of the thermal expansion is essential for reliably assessing repository performance and evaluating the safety case. This paper presents some of the investigation on the thermal processes with emphasis on the coupled Thermo-Hydro- Mechanical (THM) processes for the disposal concept of a radioactive waste disposal facility, in Boom Clay at a depth of about 500m.Geo-engineerin
Conservation Policies and Labor Markets: Unraveling the Effects of National Parks on Local Wages in Costa Rica
No full textDespite the global environmental benefits of increasing the amount of protected areas, how these conservation policies affect the well-being of nearby individuals is still under debate. Using household surveys with highly disaggregated geographic references, we explored how national parks affect local wages in Costa Rica and how these effects vary within different areas of a park and among different social groups. We found that a park’s effects on wages vary according to economic activity and proximity to the entrance of the park. Wages close to parks are higher only for people living near tourist entrances. Workers close to entrances are not only employed in higher-paid activities (nonagricultural activities) but also receive higher wages for these activities. Agricultural workers, however, are never better off close to parks (neither close to or far from the entrances). Also, workers close to parks but far away from tourist entrances earn similar or lower wages than comparable workers far away from parks. Our results are robust to different econometric approaches (OLS and matching techniques). The location of national park entrances and the possibility that agricultural workers can switch to higher-paid service activities near tourist entrances may be important tools for helping local workers take advantage of the economic benefits of protected areas.wages, national parks, matching, labor markets, conservation policies, parks, poverty
Understanding The Influence Of The First-order Magnetic Phase Transition On The Magnetocaloric Effect: Application To Gd5(sixge 1-x)4
No full textIn this article, we investigate the influence of the first-order ferromagnetic-paramagnetic phase transition, on the magnetocaloric effect, under the combined effect of external magnetic field, pressure and magnetoelastic deformation. An application is made to Gd5(SixGe 1-x)4, for x = 0.43 and 0.5. The obtained result leads to a good theoretical adjustment of the experimental data for isothermal magnetic entropy change. © 2003 Elsevier B.V. All rights reserved.2771-27883Pecharsky, V.K., Gschneidner Jr., K.A., (1997) Phys. Rev. Lett., 78, p. 4494Tegus, O., Bruck, E., Buschow, K.H.J., De Boer, F.R., (2002) Nature, 415, p. 150Von Ranke, P.J., Grangeia, D.F., Caldas, A., De Oliveira, N.A., (2003) J. Appl. Phys., 93, p. 4055Von Ranke, P.J., Pecharsky, V.K., Gschneidner Jr., K.A., (1998) Phys. Rev. B, 58, p. 12110Von Ranke, P.J., De Oliveira, I.G., Guimarães, A.P., Da Silva, X.A., (2000) Phys. Rev. B, 61, p. 447Lima, A.L., Oliveira, I.S., Gomes, A.M., Von Ranke, P.J., (2002) Phys. Rev. B, 65, p. 172411Von Ranke, P.J., Lima, A.L., Nóbrega, E.P., Da Silva, X., Guimarães, A.P., Oliveira, I.S., (2001) Phys. Rev. B, 63, p. 24422Von Ranke, P.J., Pecharsky, V.K., Gschneidner, K.A., Korte, B.J., (1998) Phys. Rev. B, 58, p. 14436De Oliveira, N.A., Von Ranke, P.J., Tovar Costa, M.V., Troper, A., (2002) Phys. Rev. B, 66, p. 94402Choe, W., Pecharsky, V.K., Pecharsky, A.O., Gschneidner Jr., K.A., Young Jr., V.G., Miller, G.J., (2000) Phys. Rev. Lett., 84, p. 4617Pecharsky, V.K., Gschneidner Jr., K.A., (1997) J. Alloys Compounds, 260, p. 98Morellon, L., Algarabel, P.A., Ibarra, M.R., Blasco, J., García-Landa, B., Arnold, Z., Albertini, F., (1998) Phys. Rev. B, 58, p. 14721Bean, C.P., Rodbell, D.S., (1961) Phys. Rev., 126, p. 104Müller, K.A., Fauth, F., Fischer, S., Koch, M., Furrer, A., Lacorre, Ph., (1998) Appl. Phys. Lett., 73, p. 1056Von Ranke, P.J., Nobrega, E.P., De Oliveira, I.G., Gomes, A.M., Sarthour, R.S., (2001) Phys. Rev. B, 63, p. 184406Von Ranke, P.J., De Oliveira, N.A., Caldas, A., (1998) Physica A, 256, p. 397Pecharsky, V.K., Gschneidner Jr., K.A., (1997) Appl. Phys. Lett., 70, p. 329
Probabilistic performance assessment of a deep tunnel for a radioactive waste repository in French COx claystone
No full textA preliminary probabilistic study of the stability of a circular drift excavated for a radioactive waste repository in the French Callovo-Oxfordian claystone is presented and discussed. An analytical mechanical model assuming isotropic elastic behaviour and linear plastic softening was used. Particular emphasis here is placed on the uncertainty of mechanical property values. The test results from several laboratories showed considerably variable property values and they have been interpreted statistically in this investigation. The obtained statistical results were used in a Monte Carlo framework. The performance of the drift was evaluated in terms of the probability of threshold exceedance in the extent of the plastic zone.Geo-engineerin
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