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Constantin Piron 《Journal of The Franklin Institute》1974,297(4):299-306
The Very Large Array (VLA) radio telescope which is presently under construction in central New Mexico is considered the highest priority new astronomical facility in the U.S.A. during the next decade. The instrument will consist of 27 separate parabolic antennas each of which will be movable along the arms of a Y-configuration. The technique of earth-rotation aperture synthesis will allow an aperture of 25 miles dia. to be synthesized. When the VLA is completed in 1981 it will be better than any other radio telescope, by one or two orders of magnitude, in terms of resolution, sensitivity and speed. 相似文献
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Alessandro N. Vargas Constantin F. Caruntu João Y. Ishihara 《Journal of The Franklin Institute》2019,356(1):31-41
This paper presents conditions to assure the exponential stability in probability for autonomous switching linear systems. The switching signal acting on the autonomous system produces intervals that follow independent, identically distributed stochastic processes—the stability then follows by verifying simple-to-check linear matrix inequalities. 相似文献
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Constantinescu Mihaela Voinea Cristina Uszkai Radu Vică Constantin 《Ethics and Information Technology》2021,23(4):803-814
Ethics and Information Technology - During the last decade there has been burgeoning research concerning the ways in which we should think of and apply the concept of responsibility for Artificial... 相似文献
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Daniel A. Glaser‐Segura Suzanne Mudge Constantin Brătianu Ionela Jianu Sorin Vâlcea 《Higher Education in Europe》2007,32(2-3):121-133
This study frames the quality transition of Romanian business education embracing the role of students as clients and customers. In the first part of the study, responses from ninety‐four fourth‐year Romanian students provided a statistically significant gap between the level of importance of business competences and their level of preparation. The second part used content analysis to establish four major improvement themes: 1) new course specification; 2) pedagogical modification using practical applications; 3) course delivery improvement; and 4) university‐directed field experiences. The findings support the notion that Romanian students provide reliable and unique assessments of their education. 相似文献
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Adrian Neculau Teodor Cozma Constantin Cucos Ion Dafinoiu Luminita Iacob Mihaela Manta 《欧洲师范教育杂志》1995,18(2-3):155-170
December 1989 meant for the Romanian academie world the break off with the communist dogmaticism and the politics of indoctrination and also the possibility of installing a critical analysis and the continuity of the true values of Romanian universities. Two inquiries conducted in 1990 and 1991 among students and Professors revealed a strong contesting pathos (persons, teaching contents and methods. The entire educational System were contested) and also a true desire to find out the critical aspects which enhances a new ideology in the higher education System. Students and a part of the faculty have discovered expressions like “academic freedom” and “academie autonomy”. They started to use concepts like “change”, “academic democracy”, “social responsibility”. New expectations concerning the behavioural offer of Professors occurred. When defining the direction of this change, authors chose the expression “toward normality”. Indices of normality could be the assumption by the university of new functions and value orientations previously forgotten and abandoned, under the dictatorial system such as creation and diffusion of values, introduction of criteria of competence and morality in evaluating both academic status and behaviour of Professors. 相似文献
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Pietro Moncada-Paternò-Castello Constantin Ciupagea Alexander Tübke 《Research Policy》2010,39(4):523-536
This paper examines whether there are significant differences in private R&D investment performance between the EU and the US and, if so, why. The study is based on data from the 2008 EU Industrial R&D Investment Scoreboard. The investigation assesses the effects of three very distinct factors that can determine the relative size of the overall R&D intensities of the two economies: these are the influence of sector composition (structural effect) vis-à-vis the intensity of R&D in each sector (intrinsic effect) and company demographics. The paper finds that the lower overall corporate R&D intensity for the EU is the result of sector specialisation (structural effect) - the US has a stronger sectoral specialisation in the high R&D intensity (especially ICT-related) sectors than the EU does, and also has a much larger population of R&D investing firms within these sectors. Since aggregate R&D indicators are so closely dependent on industrial structures, many of the debates and claims about differences in comparative R&D performance are in effect about industrial structure rather than sectoral R&D performance. These have complex policy implications that are discussed in the closing section. 相似文献
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Belemtougri RG Constantin B Cognard C Raymond G Sawadogo L 《Journal of Zhejiang University. Science. B》2006,7(1):56-63
Crude decoction, aqueous and ethanolic extracts of two medicinal plants （Psidiura guajava and Diospyros raespiliformis）, widely used in the central plateau of Burkina Faso to treat many diseases were evaluated for their antagonistic effects on caffeine induced calcium release from sarcoplasmic reticulum of rat skeletal muscle cells. These different extracts showed a decrease of caffeine induced calcium release in a dose dependent manner. Comparison of the results showed that Psidiura guajava leaf extracts are more active than extracts of Diospyros mespiliformis and that crude decoctions show better inhibitory activity. The observed results could explaine their use as antihypertensive and antidiarrhoeal agents in traditional medicine, by inhibiting intracellular calcium release. 相似文献
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Calin Valsan 《Journal of Cultural Economics》2002,26(3):203-216
This study investigates the relationship between the market value of artand the nationality of the painter. A sample of modern and contemporaryCanadian and American paintings is analyzed using non-parametric testsand a hedonic regression model. The results show a significantrelationship between aesthetic painting characteristics, such as subjectmatter, and market valuation. In general, the price of Canadian art iswell below that of American art. Even after adjusting for paintingcharacteristics, Canadian paintings appear to be less expensive still.It is believed that Canadian painters looked at the Northern landscapeto define a national identity, thus playing to a limited audience, theonly that could relate to the beauty of the Canadian scenery. Thisprogrammatic approach could explain some of the aforementioneddifferences in market valuation. 相似文献