Experimental study on seepage-induced concentrated leak erosion in sand under triaxial testing conditions

Prior to the 1930s, designs of research into sexual behavior of infrahuman primates were not comparable; conclusions about physiological and nonphysiological factors in receptivity and mating were confounded by species studied, living and testing conditions, and precaptivity history. Clearly there was need for comprehensive and controlled studies of infrahuman primate sexual behavior. In response to the controversy about biological bases of receptivity and mating, James Harlan Elder, in collaboration with Robert M. Yerkes, designed the first truly comprehensive study of factors influencing sexual behavior of chimpanzees. At that time, other persons interested in this problem were employing experimental methods, but Elder's and Yerkes' program most directly addressed the problems confounding prior study and their work served as a model of experimental research into factors affecting receptivity and mating of infrahuman primates.

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Achievement, Guessing, and Risk-Taking Behavior Under Norm Referenced and Criterion Referenced Testing Conditions

American Educational Research Journal ◽

10.3102/00028312013003207 ◽

1976 ◽

Vol 13 (3) ◽

pp. 207-215 ◽

Cited By ~ 4

Author(s):

Linda Crocker ◽

Jeri Benson

Keyword(s):

Experimental Study ◽

Analysis Of Variance ◽

Risk Taking ◽

Significant Relationship ◽

Univariate Analysis ◽

Achievement Scores ◽

Testing Conditions ◽

Choice Procedure ◽

Criterion Referenced ◽

Testing Condition

This experimental study was designed to determine whether the levels of guessing, risk-taking, or achievement could vary under norm referenced or criterion referenced testing conditions. Subjects were 156 students in an introductory measurement course, systematically assigned to a norm referenced or criterion referenced testing condition. Scores on guessing, risk-taking, achievement under penalty, and achievement without penalty-for-guessing were obtained using a multiple choice procedure suggested by Slakter (1967) . Results of multivariate and univariate analysis of variance indicated that students tested under the norm referenced condition earned higher achievement scores than those tested under criterion referenced conditions. A significant relationship was observed between risk-taking and achievement only under the criterion referenced condition.

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Experimental study on the restoration from a tilt-azimuth series for improvement in resolution

Proceedings, annual meeting, Electron Microscopy Society of America ◽

10.1017/s042482010013955x ◽

1995 ◽

Vol 53 ◽

pp. 636-637

Author(s):

Norio Baba ◽

Norihiko Ichise ◽

Syunya Watanabe

Keyword(s):

Experimental Study ◽

Spherical Aberration ◽

Incident Beam ◽

Optical Parameters ◽

Beam Tilting ◽

Illumination Method ◽

Restoration Method ◽

Illumination Mode

The tilted beam illumination method is used to improve the resolution comparing with the axial illumination mode. Using this advantage, a restoration method of several tilted beam images covering the full azimuthal range was proposed by Saxton, and experimentally examined. To make this technique more reliable it seems that some practical problems still remain. In this report the restoration was attempted and the problems were considered. In our study, four problems were pointed out for the experiment of the restoration. (1) Accurate beam tilt adjustment to fit the incident beam to the coma-free axis for the symmetrical beam tilting over the full azimuthal range. (2) Accurate measurements of the optical parameters which are necessary to design the restoration filter. Even if the spherical aberration coefficient Cs is known with accuracy and the axial astigmatism is sufficiently compensated, at least the defocus value must be measured. (3) Accurate alignment of the tilt-azimuth series images.

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