The Dielectric Properties of Wet Materials

In microwave remote sensing, knowledge of the dielectric properties of the materials observed (vegetation, soils) is important for the interpretation of the recorded reflection or emission and for the design of models for this reflection or emission. Although there exists no simple law which describes the properties of a heterogeneous system when the properties of its components are known, boundaries can be indicated for the permittivity of such a system. Heterogeneous systems containing water, such as wet soils and plant material, have very complex dielectric properties due to the role of the conductivity. However, at the higher microwave frequencies, in particular above the S-band, these conductivity effects play only a minor role and the free water is most important. When knowing the permittivity of wet materials the penetration depth can be determined. In all practical cases this depth is smaller than the wavelength used for the observations.     

Dynamische Untergrundkorrektur bei der Schnellanalyse von Spurenelementen mit der Emissionsspektrometrie

Untersuchung über die Schwankung des spektralen Untergrundes. Übertragung auf die Spurenanalyse in niedriglegiertem Stahl. Einführung eines dynamischen Untergrundäquivalents. Verbesserung der Nachweisgrenze bei den Spurenelementen unter Beibehaltung der Anregungsparameter.     

Vision and touch: A reconsideration of conflict between the two senses.

Although many studies have supported I. Rock and J. Victor's (see record 1964-07119-001) conclusion that visual-tactual conflicts will be resolved in favor of vision, the present study with 30 undergraduates presents evidence that methodological problems may have produced a bias in favor of vision. An experimental group examined blocks of wood of several sizes both visually and tactually, while 2 control groups examined the blocks by either vision or touch alone. After exposure to each block, Ss selected a comparison block of equal size from a set of 15 blocks. Group means indicate that experimental Ss made a judgment which was a compromise between their visual and tactual impressions. Closer examination showed that Ss made their judgments conform to either their visual or tactual impressions, and that there was great heterogeneity of response pattern. Results indicate that the generalization of vision as a dominant modality may be premature. (French summary) (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

Characterization of six-coordinated iron (V) in an oxide lattice

On the basis of a discussion of the correlations between the stability of the d³ configuration and the symmetry and size of the cation site, six-coordinated iron (V) has been stabilized in the La₂LiFeO₆ perovskite-type oxide and characterized by magnetic susceptibility, Mössbauer resonance and EPR measurements.     

Treatment in corrections: Martinson was wrongp.

Argues that there is a substantial body of evidence that clearly indicates that various types of interventions can reduce the recorded criminal activity of offenders and that the treatment literature is decidedly superior in terms of effectiveness, cost efficiency, and methodological rigor to the alternative, deterrence, advocated by "nothing works" proponents (e.g., R. M. Martinson, 1976). (French abstract) (60 ref) (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

Thermal properties of an epoxide resin cured with bicyclo Diels-Alder anhydride adducts

The thermal properties of polymers derived from resorcinol diglycidyl ether cured with several bicyclo Diels-Alder anhydride adducts have been investigated. Increased char yields and decreased rates of weight loss were observed for these systems as compared to polymers cured by Diels–Alder adducts from acyclic dienes. This is explained on the basis of a reverse Diels-Alder reaction which these bicyclo adducts undergo at lower temperatures than do adducts from acyclic dienes.     

Analysis of nonorthogonal designs: The 2k factorial experiment.

Asimple unweighted means ANOVA of a 2k factorial experiment with unequal and disproportionate cell frequencies resulted in the same sums of squares and F tests as the more complex Method 1 analysis recommended by J. E. Overall et al (see record 1975-20136-001). (6 ref) (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

The specific volume of poly(tetrafluoroethylene) as a function of temperature (30°–372°C) and pressure (0–2000 kg/cm2)

Experimental data on the specific volume of a 50% crystalline sample of poly(tetrafluorethylene) are presented and discussed. Data points were taken along 22 isotherms spaced 5 to 30°C apart (up to 372°C) in pressure increments of 100 kg/cm² up to 2000 kg/cm². In addition to the melting transition and the first-order solid–solid transition near room temperature, a previously reported second-order transition near 140°C at P = 0 is observed. This transition shifts to higher temperatures with increasing pressure by about 0.015°C per kg/cm². The melt data are discussed in detail. They can be fitted to both the empirical Tait equation, with the usual exponential temperature dependence of the Tait parameter, and to the Simha-Somcynsky hole theory (with the reducing parameters V^* = 0.424 cm³/g, T^* = 7906°K, and P^* = 7100 kg/cm² = 6960 bars), thus providing a test for this theory at high reduced temperatures near T? = 0.08.     

On Modeling the Single Motor Unit Action Potential

A model has been proposed for the generation of single motor unit potentials routinely observed in the clinical EMG examination of the normal biceps brachii muscle. A dipole representation was chosen for the single fiber activity. The motor unit was constructed from a uniform random array of single fibers. Motor unit potentials generated by this array have been observed at various distances both inside and outside the array. The effects of single fiber dipole axial dispersions on the potentials observed at increasing distances from the array have also been investigated. Motor unit potentials generated by the model have been compared with existing data from multielectrode studies in the biceps brachii.