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排序方式: 共有34条查询结果,搜索用时 15 毫秒
1.
Elder John P.; Ayala Guadalupe X.; Campbell Nadia R.; Slymen Donald; Lopez-Madurga Eva T.; Engelberg Moshe; Baquero Barbara 《Canadian Metallurgical Quarterly》2005,24(1):49
Participants (N = 357) were randomly assigned to 1 of 3 conditions: lay health advisor (promotora) plus tailored print materials, tailored print materials only (tailored), or off-the-shelf print materials (control). The primary outcomes were calories from fat and daily grams of fiber. Secondary outcomes included total energy intake, total and saturated fat intake, and total carbohydrates. Adjusted for baseline values, calories from fat were 29%, 30%, and 30% for the promotora, tailored, and control conditions, respectively, and grams of fiber consumed were 16 g, 17 g, and 16 g. Significant Condition X Time interactions were not observed between baseline and 12-weeks postintervention. The LHA condition achieved significantly lower levels of energy intake, total fat and saturated fat, and total carbohydrates. The relative superiority of the promotora condition may derive from the personal touch achieved in the face-to-face interactions or from the women's use of print materials under the promotora's guidance. (PsycINFO Database Record (c) 2010 APA, all rights reserved) 相似文献
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We have shown how to analyze and design simple variable-Q bandpass filters. The simplest variable-Q filter suffers from two shortcomings. Its center frequency is not exactly the planned-for center frequency, and the amplitude at the center frequency is not exactly the planned-for amplitude of unity. We presented a slightly more complicated filter in (6) that meets all the variable-Q filter's desired specifications quite precisely. 相似文献
3.
Davalos Monteiro Raul van de Wetering Jan Krawczyk Benjamin Engelberg Dirk L. 《Metals and Materials International》2020,26(5):630-640
Metals and Materials International - The corrosion behaviour of type 316L stainless steel in aqueous 30–50 wt%. NaOH at temperatures up to 90 °C has been elucidated.... 相似文献
4.
Cem Örnek M. G. Burke T. Hashimoto D. L. Engelberg 《Metallurgical and Materials Transactions A》2017,48(4):1653-1665
22Cr-5Ni duplex stainless steel (DSS) was aged at 748 K (475 °C) and the microstructure development correlated to changes in mechanical properties and fracture behavior. Tensile testing of aged microstructures confirmed the occurrence of 748 K (475 °C) embrittlement, which was accompanied by an increase of strength and hardness and loss of toughness. Aging caused spinodal decomposition of the ferrite phase, consisting of Cr-enriched α″ and Fe-rich α′ and the formation of a large number of R-phase precipitates, with sizes between 50 and 400 nm. Fracture surface analyses revealed a gradual change of the fracture mode from ductile to brittle delamination fracture, associated with slip incompatibility between ferrite and austenite. Ferrite became highly brittle after 255 hours of aging, mainly due to the presence of precipitates, while austenite was ductile and accommodated most plastic strain. The fracture mechanism as a function of 748 K (475 °C) embrittlement is discussed in light of microstructure development. 相似文献
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Weakly-acyclic games—a superclass of potential games—capture distributed environments where simple, globally-asynchronous interactions between strategic agents are guaranteed to converge to an equilibrium. We explore the class of routing games introduced in Fabrikant and Papadimitriou (The Complexity of Game Dynamics: BGP Oscillations, Sink Equilibria, and Beyond, pp. 844–853, 2008) and in Levin et al. (Interdomain Routing and Games, pp. 57–66, 2008), which models important aspects of routing on the Internet. We show that, in interesting contexts, such routing games are weakly acyclic and, moreover, that pure Nash equilibria in such games can be found in a computationally efficient manner. 相似文献
7.
One of the most important pieces of instrumentation used to make measurements is the analog-digital converters. It consists of a sample and hold circuit, a one-bit ADC, a one-bit digital-to-analog converter (DAC), a summing circuit, and an analog differencing unit. The actual conversion to a multi-bit digital value is performed by some form of microprocessor that implements a digital low-pass filter. Using digital signal processing techniques it is simple to calculate the average value and output it as a binary word. It is possible to simulate a reasonably complicated system using Excel. Furthermore, Excel can help with the analysis of the system-up to a point. Using a very common and reasonably simple tool, you can learn about and experience the SigmaDelta converter. 相似文献
8.
Engelberg YM Ruschin S 《Journal of the Optical Society of America. A, Optics, image science, and vision》2004,21(11):2135-2145
A method is presented that expands the scheme of physical optics propagation beyond the Fresnel approximation to include beams that are nonparaxial. The formalism retains most of the calculation advantages of the Fresnel approach; i.e., it is based on a single Fourier transform step. The kernel of the new transformation is no longer separable in Cartesian coordinates; thus the formalism can account for astigmatic coupling effects originating purely from diffraction. The validity limits of the proposed algorithm are explored. Analytical expressions, numerical simulation results, and experimental data are compared. 相似文献
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We consider comparator-based nonlinear feedback systems, and use Tsypkin's method to develop a strategy with which to find systems with low-pass linear part for which the describing function technique erroneously predicts limit cycles. We produce an infinite set of examples of systems with very low-pass linear parts for which the describing function technique predicts spurious limit cycles, and also provide a more practical example in which limit cycles are erroneously predicted. 相似文献