The complete analysis of the polyorganosiloxanes formed by the trimethylsilylation of the minerals olivine and suzorite

Methods are reported for the separation and complete quantitative estimation of the polyorganosiloxanes prepared by the trimethylsilylation of mineral silicates. Quantitative methods for the determination of low molecular weight oligomers up to Q₆M₁₂ (Q≡SiO_4/2; M≡(CH₃)₃SiO_1/2) are well known but there are no previously reported methods for the determination of high molecular weight species. This paper describes the application of gel permeation chromatography and quantitative high performance liquid chromatography to the study of these higher molecular weight species. Polyorganosiloxanes prepared from suzorite (a phlogopite) and from olivine (an orthosilicate) are used as examples. A further example is a study of the formation of higher molecular weight species on heating these polymers.     

A Multimedia Application for Teaching Design for Manufacturing

This paper describes the interactive multimedia injection molding tutor developed at the University of Massachusetts Amherst. The purpose of the tutor is to use visually stimulating animations in order to enable the user, a student or anyone not familiar with the process of injection molding, in understanding the relationship between part design and the ease or difficulty of producing the part. Preliminary evaluations indicate that the tutor can be successful in achieving these objectives.     

Amygdala central nucleus lesions attenuate acoustic startle stimulus-evoked heart rate changes in rats.

Amygdala central nucleus (CNA) lesions were used to test the hypothesis that stimulus-evoked heart rate changes can reflect the development of fear during acoustic startle testing A 120-dB white noise startle stimulus produced freezing as well as phasic heart rate accelerations and decelerations, and an abrupt decrease in tonic heart rate, in sham-operated rats. These responses were all significantly reduced in CNA-lesioned rats. In contrast, an 87-dB stimulus elicited only significant phasic decelerations that were similarly attenuated by the CNA lesions. In a follow-up experiment. the CNA lesions also attenuated phasic cardiac decelerations evoked by a conditioned stimulus-like, 85-dB pure tone. The results support the contention (B. J. Young & R. N. Leaton, see record 1995-12737-001) that heart rate changes can reflect fear conditioned during acoustic startle testing and, in addition, suggest that the amygdala mediates responses to nonsignal acoustic stimuli. (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

Phase separation in non-solvent/dimethylformamide/polyethersulphone and non-solvent/dimethylformamide/polysulphone systems

The cloud point curves for the ternary solutions non-solvent/dimethyl-formamide/polyethersulphone and non-solvent/dimethylformamide/polysul-phone were determined by a titration technique, at 303 K. In both systems the following order of increasing non-solvent content at the cloud point was obtained: water < methanol < ethanol < 1-propanol < acetone < carbon tetrachloride. For each non-solvent the cloud point curve for the PES system occurred at higher non-solvent concentrations than for the corresponding PSN system.     

Slip-line field solutions for three-point notch-bend specimens

The slip-line field solutions for three-point bend specimens are reviewed for both deep and shallow notches. Plastic constraint factors, hydrostatic stress at the notch root and rotation constant to enable the crack upp opening displacement to be determined are given for a wide range of notch geometries. These values can be used in the fracture analysis of low strength metal specimens.

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Résumé On passe en revue les solutions décrivant les champs de bandes de glissement dans des éprouvettes de flexion sur trois appuis, dans les deux cas d'entailles peu profondes. On fournit pour une large gamme de géométries d'entaille les facteurs de retraint plastique, les contraintes hydrostatiques à la racine de l'entaille et la constante de rotation permettant de déterminer le COD à l'extrémité de la fissure. Ces valeurs peuvent être utilisées pour l'analyse de la rupture des éprouvettes de métaux à faible résistance.

     

Metaphor in psychodynamic psychotherapy with borderline and non-borderline clients: A qualitative analysis.

Conducted an intensive, qualitative analysis of borderline and non-borderline client's and therapist's experiences of metaphoric expression in a single psychotherapy session. Open-ended interviews were conducted with 2 therapists and 4 clients (aged 24–38 yrs; 2 borderline and 2 non-borderline) who were actively engaged in psychoanalytically-oriented, long-term psychotherapy. The intensive analyses of inquiry interview transcipts revealed 3 important categories of metaphor functions that were shared by all 4 psychotherapy dyads: (1) metaphors illuminate clinical issues, (2) metaphor functions to depict clients' self and object relationships, and (3) therapist metaphor stimulates an intensification of client experiential engagement in therapy. Patterns differentiating the borderline and non-borderline dyads in relation to metaphor use were discussed in the context of 2 core categories: the Representation Mode of Interaction and the Literal Mode of Interaction. (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

Group self-identification and adolescent cigarette smoking: A 1-year prospective study.

As an extension of previous work, we analyzed the longitudinal relations between group self-identification and adolescent cigarette smoking. The predictive precedence of cigarette smoking and identification with 6 different types of peer groups was examined. Results indicated that 7th-grade group self-identification predicted 8th-grade cigarette smoking, whereas 7th-grade cigarette smoking did not predict 8th-grade group self-identification. Group self-identification also was compared with 7 other psychosocial variables as predictors of smoking 1 yr later. The pattern of results suggests that group self-identification is about as good a predictor of smoking as other psychosocial variables, and that group self-identification is more than a mere proxy of other psychosocial variables. (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

Organizational structures and service delivery in Nova Scotia.

Surveyed 16 clinical settings in Nova Scotia to determine the nature of the psychological services offered and examined their organizational context. 13 surveys were returned. The majority of the settings provide traditional mental health services. The majority of clinical psychologists are found in general regional hospitals rather than in mental health settings. Psychologists offer a wide array of services, such as those to medical patients. Psychologists practice independently; they are able to assess and treat patients in the absence of either assessment or referral by other professionals. The interests of psychologists tend to be represented at the highest level of their institutions by professionals other than psychologists. There were no organized psychology departments in more than half the settings. (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

Communications and the personal computer

Communication between personal computers and other computers is a rapidly developing area of computing. The paper provides an overview of the many alternatives currently available for implementing communications on personal computers. The techniques covered include asynchronous and synchronous techniques, terminal emulations, workstation replacement, disc emulators, data concentrators and techniques peculiar to personal computers themselves. Consideration is also given to some of the advantages and disadvantages of each technique, the problems of using imported personal computer software and hardware, and of attaching personal computers to British Telecom lines. The likely factors affecting the future development of personal computer communications are also discussed.     

Energy resources—are we planning for the future?—a review

Many governments are at present attempting to formulate energy strategies for ensuring future supplies. the debate over nuclear power is continuing and ‘pollution-free’ alternative energy sources are also being considered. Points for and against each of the possible energy sources are discussed here and the possible hazards of nuclear power (e.g. radioactivity) are compared with the possible dangers of ‘free-energy’ sources (e.g. an increased ‘greenhouse’ effect). the importance of an integrated energy policy is stressed. Such a policy does not rely on a single energy source but utilizes the full spectrum of possibilities and can incorporate the more immediate concepts of energy savings.