Results 281 to 290 of about 9,698,512 (350)

Progressive Ratio as a Measure of Reward Strength

Science, 1961
Four rats were trained to press a lever on a ratio schedule of reinforcement in which the number of lever presses required on each consecutive run increased by a fixed increment. Both concentration and volume of the reward were varied. Relationships were obtained between reward and deprivation variables and the size of the final completed ratio run.
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WII branching ratios and oscillator strengths

Journal of Quantitative Spectroscopy and Radiative Transfer, 2000
Abstract Branching ratios of 280 W II lines from 19 excited levels in the wavelength range 204–750 nm are presented which were obtained by means of emission measurements on a high-current hollow cathode as well as a suitable Penning discharge lamp and by using a high-resolution Fourier-transform spectrometer.
R Kling, Jan Olof Ekberg, M Kock
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Strength of amalgam prepared with the 1:1 alloy:mercury ratio

The Journal of Prosthetic Dentistry, 1966
Abstract The early and final compressive strength of amalgam prepared by use of a 1:1 alloy:mercury ratio was investigated. The compressive strength of amalgam prepared with 1:1 alloy:mercury ratios showed a significant increase in one hour strength and generally a slight increase in one week strength when compared with amalgam prepared with ...
J E, Overberger, J F, Povlich, R E, Sausen   +2 more
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Oscillator strengths and radiative branching ratios in atomic Sr

Physical Review A, 1992
Tables of radiative transition rates (A) are provided for allowed singlet and triplet transitions between Sr states below n\ensuremath{\simeq}11. These are obtained from a combination of R-matrix, multichannel-quantum-defect-theory (MQDT), and modified Coulomb-approximation calculations, plus branching-ratio measurements.
, Werij, , Greene, , Theodosiou, , Gallagher   +3 more
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Ratio of cube strength to axial compressive strength of rocks

Soviet Mining Science, 1978
1. For salt rocks of the Starobinsk potash salt deposit a hyperbolic relation exists between the compressive strengths and h/d, determined by the equation $$\sigma = 124.6 + \frac{{178.2}}{{h/d}},kgf/cm^2 .$$ 2. The ratio between the axial compressive strength (h/d≥2) and the cube strength (h/d=1) was as follows: for salt rock 0 ...
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Optimum strength ratio of hysteretic damper

Earthquake Engineering & Structural Dynamics, 1998
An accurate and practical testing technique to study seismic performance of multi-storey infilled frames is formulated. This technique is based on the pseudo-dynamic method which can provide an acceptable approximation of the dynamic performance of structures under the influence of earthquake excitation.
Kazuo Inoue, Susumu Kuwahara
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Flexural/Tensile Strength Ratio in Rock-like Materials

Rock Mechanics and Rock Engineering, 2001
Results are presented and discussed from a testing program to study the flexural strength of a rock-like material. In order to investigate the size effects, experiments were performed using specimens of a medium grained size granite. For geometrically similar beams of different sizes, this paper presents and discusses experimental evidence from ...
BIOLZI, LUIGI, CATTANEO, SARA, ROSATI, GIANPAOLO   +2 more
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Dielectric Strength Ratio Between Alternating and Direct Voltages

Transactions of the American Institute of Electrical Engineers, 1923
High-Voltage insulation testing has been and is usually still done by alternating voltages. High direct voltage was made available for testing purposes by the development of the kenotron tube. When used for testing insulation direct voltage has several advantages over alternating voltage.
J. L. R. Hayden, W. N. Eddy
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Strength Ratios of Orthotropic Materials

1982
Orthotropic materials such as unidirectional composites have a high degree of directionality in their strength. For example, most modern composite materials have longitudinal strength ten to twenty times that of the transverse and shear strengths. Under the imposed combined stresses or strains, the failure criteria must be more exact than that required
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Very high strength-to-weight ratios for fiber strength members

OCEANS 2000 MTS/IEEE Conference and Exhibition. Conference Proceedings (Cat. No.00CH37158), 2002
There is a need for stronger and more durable flexible tension members to meet the requirements for an increasingly wider range of applications for the oceanographic, marine and offshore industries. New constructions and new fibers are now providing engineers and users with new capabilities. Fibers are now making it possible to develop flexible tension
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