Determination of Solubility Parmeter Values for Pure Solvents and Binary Mixtures

The estimation of the solubility parameter (δ) values for pure liquids and binary mixtures of pharmaceutical interest are considered. It is. initially assused that a previously reported relationship between solubility parameter and dielectric constant for pure polar solvents can be extended to liquid mixtures. If this expression is operative for pure liquids and binary blends, there remains a need to correlate derived values from an independent theoretical or experimental approach. Thus, it is submitted that the molal boiling point elevation as a colligative property might be useful in this regard. It is seen that a good correlation exists for the estimation of solubility parameters from both methods. Several simplifying and limiting aseumptions are made for the second method and arc considered.     

The relevance of behavioral criteria developed from the critical incident technique.

Behavioral criteria were examined for reliability and relevance. The performance of 300 pulpwood producers (of whom 150 were used for cross-validation purposes) on 8 behavioral categories was observed by foresters and dealers. The intercorrelations among the category scores were relatively low, indicating that the criteria were moderately resistant to the halo error. The relevance of the criteria to cost related measures was empirically demonstrated using multiple regression techniques. (French summary) (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

Analytical and numerical procedures in the application of many-body green's function methods to electron-atom scattering problems

The analytical and numerical procedures used in calculation of e^?-He elastic scattering phase shifts in the Generalized Random Phase Approximation (GRPA) and e^?-He inelastic cross sections in the Random Phase Approximation (RPA) are presented. The pertinent equations are first written in general form and analyzed into spin and angular momentum variables. In both elastic and inelastic work the transition density matrix was represented on a basis. Finite basis sets were also used to construct the static-exchange and polarization parts of the optical potential. The elastic scattering phase shifts were then evaluated numerically. In the inelastic work all calculations were done numerically. As an illustration of the usefulness of these methods, some typical results and computational times are given.     

Contingent time off to increase verbal behavior: A case report.

Describes the case of a withdrawn adolescent male outpatient at a mental health clinic who was instructed to record his own verbal behavior. Consequences were implemented to increase the frequency of verbal responses. S "earned" his way out of the clinic by increasing his verbal behavior to an established criterion performance. (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

Problems in the design of power transformers

The power loss of transformer cores can still be considerably reduced by improved joint design based on new knowledge of the localized flux distribution, both in the corners and in the limbs. Rotational flux has been measured in the T-joints of experimental cores, and it has been found to cause localized high loss regions dependent on the joint design. Circulating harmonic fluxes have been found in individual laminations in the limbs of three-phase cores. The path of the harmonics is independent of joint design although their magnitudes are dependent. Circulating 3rd harmonics as large as 0.3 T have been found in a core magnetized sinusoidally at 1.6 T. These cause additional losses calculated to be 20% of the nominal core loss, and great savings would be possible if the circulating harmonics could be reduced or eliminated.     

Differentiation of organics from schizophrenics at two chronicity levels by use of the Reitan-Halstead Organic Test Battery.

Attempted to determine whether the Reitan-Halstead Organic Test Battery separates neuropsychiatric hospital organics from schizophrenics. It was administered to 25 schizophrenics and 25 cerebral-lesion organics at each of 2 chronicity levels. Only 1 of the 24 diagnosis/diagnosis * chronicity effects used to evaluate the data was significant at the .05 level, indicating that actuarial application of Reitan-Halstead scores is of no practical value in the separation of the 2 groups. To determine whether expert clinicians might improve upon the actuarial results, protocols of 24 schizophrenics and 24 organics were sent to 8 Reitan-Halstead experts who were instructed to separate them into brain-damaged and schizophrenic diagnostic groups. The mean number of correct classifications, 25.5 out of 48 suggested that clinical judgment added nothing to actuarial prediction in this case. (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

An Overview of Progress in the Design And Implementation of Landsat-D Systems

Landsat-D will be launched in late 1981 or early 1982 into a Sun-synchronous orbit near 700 km. Landsat-D systems and the principal observing instrument, the Thematic Mapper, are being designed and implemented to provide a significantly improved Earth-resources monitoring capability. The Thematic Mapper will have seven spectral bands (0.45-0.52, 0.52-0.60, 0.63-0.69, 0.76-0.90, 1.55-1.75, 2.08-2.35, and 10.5-12.5 ?m), with an instantaneous field of view at nadir of 30 m except for the thermal band (120 m). The data from the Thematic Mapper and other Landsat-D flight segment systems will be relayed to the Landsat-D ground data processing system using a direct readout capability or the Tracking and Data Relay Satellite System and communications satellites. The ground systems will process the data as it arrives at rates up to 100 Mbit/s and a total volume of 2.6 × 1011 bit/day into standard digital and photographic products within 48 hours of data acquisition. This includes 200 Multispectral Scanner Subsystem and 100 Thematic Mapper scenes per day. The Thematic Mapper increased spatial, spectral, and radiometric resolution should be of primary benefit in agricultural and vegetation surveys, but substantial improvements in resource and land cover observations for geology, land use, and water resources applications are also to be anticipated.     

Coal liquids distillation tower corrosion: chloride analysis of solvent refined coal process samples

Severe chloride corrosion incidents have occurred in the distillation area of major direct coal liquefaction plants. Chloride analyses have been carried out for samples collected at various process streams of one of these plants (the Wilsonville, Alabama SRC-1 pilot plant) in order to define the pathway of corrosive species to the distillation area. These analyses show that the major fraction of the chloride in the atmospheric distillation tower is carried there in the higher-boiling process streams. The chloride level at a particular point in the atmospheric distillation tower may be several times that of the tower feed liquid; this concentration contributes to the catastrophic corrosion experienced in these towers. This chloride concentration provides an explanation for the occurrence of the corrosion in the last distillation tower in the process stream, rather than in the tower(s) first contacted by the chloride containing distillate stream. It also accounts for the observed localization of the corrosion within narrow regions of the atmospheric distillation tower. The chloride concentration and the chloride pathway are factors which designers of coal liquefaction distillation processes need to consider in a design that will keep corrosion to a manageable level.     

Problems encountered at work by people with severe acquired hearing loss

A structured questionnaire concerning problems encountered at work was administered to 88 adults of employment age suffering from acquired sensorineural hearing loss (60 dB +). While respondents were not likely to be out of work by virtue of their hearing loss, they found it difficult to cope at work for a variety of reasons. Information from a subsequent open-ended interview threw some light on the validity of the questionnaire and in particular illustrated the need to combine quantitative and qualitative methods of data collection.