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排序方式: 共有10000条查询结果,搜索用时 15 毫秒
981.
982.
983.
P Hourdequin L Bednarczyk R Gabriel G Harika C Quereux P Wahl 《Canadian Metallurgical Quarterly》1996,25(5):528-532
We report three cases of pulmonary edema associated with prolonged intravenous tocolytic therapy with beta 2-adrenergic agonists among patients with multiple pregnancies. Although beta 2-adrenergic agonists may have direct myocardial side-effects, the underlying pathophysiologic mechanisms are mainly noncardiogenic. The most important one appears to be the fluid overload, related to amounts of fluids given intravenously and to direct result of beta-sympathomimetic therapy on renal excretion of sodium and water. Neonatal benefit of prolonged tocolytic therapy remains hypothetical. If this strategy is used, the prevention of cardiovascular adverse effects requires an intensive maternal supervision, especially in case of multiple pregnancy, the use of beta 2-adrenergic agonists in concentrated solution in order to reduce the amounts of fluids given intravenously, and the association with progesterone therapy which can reduce the infusion rate and the duration of tocolytic therapy. 相似文献
984.
985.
S. M. Logvinkov G. D. Semchenko S. V. Tishchenko V. I. Toshinskii V. A. Borovaya I. N. Opryshko 《Glass and Ceramics》1996,53(1-2):33-34
Compositions and technologies are suggested for preparing highly efficient catalyst blocks with a honeycomb structure to be used for reducing nitrogen oxides with ammonia in flue gases from thermal power plants. The blocks have high structural strength and catalytic activity. 相似文献
986.
G. Carelli N. Ioli J. C. S. Moraes A. Moretti F. Strumia G. E. Annino A. Bertolini 《Journal of Infrared, Millimeter and Terahertz Waves》1996,17(6):1023-1030
The results described in this work are part of a systematic search for long wavelength laser lines to be used in high magnetic field EPR applications and in plasma diagnostic. Four new far-infrared laser lines of CH2 = CF2 (1,1 difluoroethylene), optically pumped by a waveguide CO2 laser, have been discovered and characterized in wavelength, polarization relative to the pumping radiation and offset relative to the CO2 center frequency. New measurements of polarization and offset of 5 already known laser lines are also reported. A table of all of the known CO2 pumped FIR laser lines from this molecule is given. 相似文献
987.
This paper presents a six-year study of the use of computers in a Greek primary school, based on the premise that, in contrast to current technocentric views regarding the use of information technology in the Greek educational system, computers can be used as tools for self-enhancement. The aim of the school project was to infuse a child-centred pedagogy, through the learning of Logo programming, into the whole of the school's society, i.e. all children and all teachers. Within this context, we have identified and explored how children may learn programming through a process of forming ‘naive’ or locally applicable theorems concerning key programming ideas such as the use of primitives, structuring a problem by means of writing procedures, and constructing and working with generalised notional objects by means of defining procedures with variable inputs. We discuss the emerging interrelated educational and technological aspects concerning this kind of learning, and then set these against the challenge to exploit the developing technology further in order to design expressive media of increasing flexibility and power, and to focus on specific learning domains. 相似文献
988.
The authors present a method for solving a class of optimization problems with nonsmooth constraints. In particular, they apply the method to the design of narrowband minimum-power antenna array processors which are robust in the presence of errors such as array element placement, look direction misalignment, and frequency offset. They first show that the constrained minimum power problem has a unique global minimum provided that the constraint set is nonempty. Then it is shown how the design problem derived directly from considerations of the sensitivity of the antenna array processor to errors can be transformed into a quadratic programming problem with linear inequality constraints which can be solved efficiently by the standard active set strategy. They also present numerical results for two types of nonsmooth constraints developed to provided robustness. These results confirm the effectiveness of the method 相似文献
989.
Nener B.D. Lai S.T. Faraone L. Nassibian A.G. 《IEEE transactions on instrumentation and measurement》1993,42(5):913-919
A method of directly evaluating the activation energy ΔE, capture cross section σ, and density NT, of deep-level traps from the pulsed reverse bias capacitance transient is described. The main advantages of this technique are that it requires only a single temperature scan, and it can resolve nonexponential transients due to closely-spaced energy levels. The test samples used for this paper consisted of Schottky diodes fabricated on nonirradiated and 1-MeV electron-irradiated n-type VPE (vapor-phase epitaxy) GaAs wafers. The well known EL2 trap was identified with ΔE of 0.81 eV, and σ n of 1.0×10-13 cm2 for the nonirradiated sample. These values were found to be in good agreement with published data using established, conventional DLTS techniques. For the irradiated samples a nonexponential capacitance transient was found in the EL2 range of temperatures. The discussed technique was able to resolve two closely spaced deep levels lying at Ec-0.81 eV and Ec-0.84 eV, and with capture cross sections of 1.5×10-13 cm2 and 2.5×10-12 cm2, respectively 相似文献
990.
A unified formulation for Chebyshev and Legendre superdirective endfire array design 总被引:1,自引:0,他引:1
Miaris G. Chryssomallis M. Vafiadis E. Sahalos J. N. 《Electrical Engineering (Archiv fur Elektrotechnik)》1995,78(4):271-280
Contents A unified formulation for superdirective end-fire arrays by using Chebyshev and Legendre Polynomials and their maximum directivities as well as the corresponding efficiency index and theQ factor are found. Several examples show the simplicity of the formulation.
Eine einheitliche Formulierung zum Design von Supergain-Längsstrahlern mit Tschebyscheff- und Legendre-Polynomen
Übersicht Es wird eine einheitliche Formulierung für Supergain-Längsstrahler mit Tschebyscheff- und Legendre-Polynomen vorgestellt. Die Strahlergruppen werden für unterschiedliche Kombinationen dieser Polynome angegeben, ebenso ihre optimalen Richtgewinne wie auch der dazugehörige Strahlungs- Wirkungsgrad in der Hauptrichtung und der GütefaktorQ. Einige Beispiele belegen die Einfachheit der Formulierung.相似文献