Results 251 to 260 of about 1,923,064 (277)

Updating finite element dynamic models using an element-by-element sensitivity methodology

AIAA Journal, 1993
Summary: A sensitivity-based methodology for improving the finite element model of a given structure using test modal data and a few sensors is presented. The proposed method searches for both the location and sources of the mass and stiffness errors and does not interfere with the theory behind the finite element model while correcting these errors ...
Farhat, Charbel, Hemez, Francois M.
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Shaping of the characteristics of temperature-sensitive elements

Transactions of the American Institute of Electrical Engineers, Part I: Communication and Electronics, 1954
A method for shaping the characteristics of temperature-sensitive elements is described, together with a practical example. The proposed method permits the shaping of characteristics of the temperature-sensitive elements in order to obtain the desired form.
E. Keonjian, J. S. Schaffner
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Dynamics of Redox-Sensitive Elements

2014
Following the onset of stratification in spring, the interaction between the oxy-anions of Mo, U, and Sb with reduced solutes in Lake Kinneret lower water mass (LWM) causes the removal of part of these redox-sensitive elements. However, the removal is shown here to occur also during the de-stratification stage in autumn in both the top of the HS−, Fe ...
Ami Nishri, Ludwik Halicz
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Consistent Finite-Element Response Sensitivity Analysis

Journal of Engineering Mechanics, 2003
This paper examines the important issue of response sensitivities of dynamic models of structural systems to both material and (discrete) loading parameters. Plasticity-based finite-element models of structural systems subjected to base excitation such as earthquake loading are considered.
J. P. Conte, P. K. Vijalapura, M. Meghella   +2 more
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Shape Sensitivity by Finite Elements*

Journal of Structural Mechanics, 1986
ABSTRACT An analytical approach for performing shape sensitivity analysis of structural response requires a knowledge of derivatives of loads, stress, and stiffness matrices of the finite elements of the model, with respect to parameters that control structural shape. This paper presents a new method for computing such derivatives. It uses either first-
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Extreme sensitivity in trace element detection

Applied Physics B: Lasers and Optics, 1999
A technique is demonstrated which can detect extremely low levels of trace elements. This technique uses multicolor, selective multiphoton ionization of a trace impurity species followed by ion-induced nucleation in a supersaturated vapor, which allows the detection of single ions at atmospheric pressures. The combination of these two processes has the
H.N. Ereifej, G.J. Doster, J.L. Schmitt, J.G. Story   +3 more
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Sensitive Element on Cross-Wound Helices

IEEE Sensors Journal, 2017
A novel sensitive element, formed by cross-wound helices, is investigated and described in this paper. Based on the outstanding properties of the coupled slow-wave structures, such as splitting electric and magnetic fields and the multiple increase in the slowdown, this sensitive element combines the advantages of the elements with distributed ...
Yuriy N. Pchelnikov, Andrey A. Yelizarov
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Sensitive Element Design Methodologies

2015
Analysis of CVG-sensitive element motion equations and its solutions studied earlier allows us to derive expressions for major measurement performances and errors of CVG. This, in turn, makes possible to optimise performances by proper selection of the sensitive element parameters, as well as to reduce or even eliminate CVG measurement errors.
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A Single Element Birefringence-Sensitive Interferometer

Journal of Optics, 2008
It is shown that a cube beam splitter can serve as a single-element birefringence-sensitive interferometer. The polarization-masked beam splitter is oriented as in Gate’s Interferometer i.e., the beam splitting interface is parallel to the incident plane beam.
N. Ghosh, A. K. Chakraborty, K. Bhattacharya   +2 more
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Elements of Sensitivity Theory

2019
The topic of network and filter sensitivity became relevant with the advent of inductorless, and in particular active-RC, filters. This is because the previously used passive LCR ladder filters have an extraordinary quality of being relatively insensitive to variations in component value caused by temperature and other ambient influences, as well as to
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