A longitudinal examination of the reciprocal relations between perceived parenting and adolescents' substance use and externalizing behaviors.

Although studies have found an association between adolescent problem behavior and deficits in parental support and control, questions remain concerning the causal nature of these relations. Using longitudinal data, this study explored prospective reciprocal relations between perceived parenting and adolescents' substance use and externalizing symptoms. A community sample of adolescents and their parents (N?=?441) was studied, within which half of the adolescents were at risk for problem behavior because of parental alcoholism. Covariance structural modeling revealed full reciprocal relations between adolescent substance use and levels of parental support and control. Furthermore, although adolescent externalizing behaviors prospectively predicted parental control and support, parenting was not prospectively related to externalizing symptoms. The findings support the reciprocal effects model of socialization. (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

Indicators of failed information epidemics in the scientific journal literature: A publication analysis of Polywater and Cold Nuclear Fusion

Summary A literature review uncovered six distinctive indicators of failed information epidemics in the scientific journal literature: (1) presence of seminal papers(s), (2) rapid growth/decline in author frequency, (3) multi-disciplinary research, (4) epidemic growth/decline in journal publication frequency, (5) predominance of rapid communication journal publications, and (6) increased multi-authorship. These indicators were applied to journal publication data from two known failed information epidemics, Polywater and Cold Nuclear Fusion. Indicators 1-4 were distinctive of the failed epidemics, Indicator 6 was not, and Indicator 5 might be. Further bibliometric study of these five indicators in the context of other epidemic literatures needed.     

Review of Quantitative and Automated Needle Electromyographic Analyses

Conventional clinical electromyography involves subjective interpretation of the signal recorded from human muscle. A variety of recognition techniques have been applied to obtain objective quantitative tmeasures. This paper reviews the evolution of analytic techniques applied to the electromyogram. Included are a discussion of motor unit action potentials (amplitude, duration, and shape), their identification and interaction within an interference pattern, and application of mathematical modeling techniques to the analysis of complex interference patterns. The clinical applications of current electromyographic analyses are summarized.     

A comparison of the psychological and hormonal factors in women with and without premenstrual syndrome.

Women with premenstrual syndrome (PMS; n?=?14) were compared with women without premenstrual syndrome (n?=?14). The diagnosis was based on the volunteers' responses to the Premenstrual Assessment Form, their medical history, a physical examination, and the Utah PMS Calendar. After assignment to the non-PMS or PMS group, each subject was studied for one menstrual cycle and was evaluated, once during the follicular phase and twice during the luteal phase. On each of these occasions, circulating concentrations of estradiol and progesterone were determined, and the Depression Adjective Checklist (DACL), the Minnesota Multiphase Personality Inventory (MMPI), and the Attributional Style Questionnaire were completed. Each subject recorded daily her physical symptoms on the Utah PMS Calendar. During the luteal phase, women with PMS had significantly higher levels of depression as measured by the DACL and MMPI than women without PMS. The two groups did not differ in the follicular phase. These findings suggest a luteal phase disorder superimposed on a background free of psychiatric or physiological illness. (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

Shape optimization using the boundary element method with substructuring

Applications of the boundary element method for two- and three-dimensional structural shape optimization are presented. The displacements and stresses are computed using the boundary element method. Sub-structuring is used to isolate the portion of the structure undergoing geometric change. The corresponding non-linear programming problem for the optimization is solved by the generalized reduced gradient method. B-spline curves and surfaces are introduced to describe the shape of the design. The control points on these curves or surfaces are selected as design variables. The design objective may be either to minimize the weight or a peak stress of the component by determining the optimum shape subject to geometrical and stress constraints. The use of substructuring allows for problem solution without requiring traditional simplifications such as linearization of the constraints. The method has been successfully applied to the structural shape optimization of plane stress, plane strain and three-dimensional elasticity problems.     

Methanogenic fermentation of scots pine (Pinus sylvestris) sawdust: Enhancement by physicochemical pretreatment

The three major polymeric components of Scots Pine sawdust–lignin, hemicellulose and cellulose–represent potential substrates for methanogenic fermentation although, in the absence of physicochemical pretreatment, low digestibility was demonstrated even after protracted incubation (18 months). Acid (H₂SO₄) and alkali (NaOH) pretreatments mediated different effects although, in general, the rates and percent solubilisations increased with concentration, temperature, pressure and time, either singly or in combination. Individual methanogenic fermentations with the hydrolysates and residual solids showed that although 3.3% more methane resulted from the H₂SO₄ hydrolysate than the corresponding NaOH hydrolysate, in total, 7% more methane was generated from the two alkali fractions than from the corresponding acid fractions. The results thus exemplified that choice of a specific physicochemical strategy must be made in conjunction with the expected yield from the selected fraction(s).     

Parents' use of friendship facilitation strategies and the formation of friendships in early adolescence: A prospective study.

On the basis of semistructured discussions among 40 adolescents and their parents regarding family involvement in friendship formation, the authors identified 46 possible strategies parents could use to help adolescents establish new friendships after relocation to a new community. A total of 157 mother–adolescent pairs reported how often the parents used each strategy during the prior 3 mo. Principal-components analysis identified 4 groups of strategies: met other parents, enabled proximity to peers, talked to adolescent, and encouraged activity. Prospective analyses using 138 mother–adolescent pairs who completed 3 home interviews over an 8-mo period indicated that parents' more frequent use of strategies predicted adolescents' greater companionship and intimacy with new friends. Strategies that required active parental engagement in the adolescent's social world seemed particularly helpful. (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

Transformation champ proche — champ lointain bidimensionnelle et monodimensionnelle appliquée à des mesures de SER

In high frequency thercs measurement of large target must be done at important distances, so the distance of measurement (Fraunhofer’s distance) R is given by R ≥ 2d² /λ where d is the tranversal length of the target and λ the radiation wavelength. In this paper we present a method for target that are large relative to the curvature of the spherical wavefront and the curvature of the cylindrical wavefront. A two-dimensional analytical algorithm transforms the spherical wave (near-field) measurement into the desired plane wave (far-field) and a one-dimensionnal analytical algorithm transforms the cylindrical wave (near-field) measurement into the desired plane wave (far-field). We present some results on simulations and measurements. A comparison of one-dimensional and two-dimensional methods demonstrates the efficiency of the two dimensional methods.     

Prospective differential prediction of adolescent alcohol use and problem use: Examining the mechanisms of effect.

This prospective study tested the assertion that psychopathology would predict both adolescent alcohol use and problem use, whereas socialization factors would predict only use, and explored mechanisms by which predictors led to problem use in a community sample of families (N?=?216). Externalizing symptoms, parental alcoholism, peer influences, and parental support were indirectly related to negative consequences through their effects on use level. Externalizing symptoms, internalizing symptoms, peer influences, and parental approval of use directly predicted consequences, controlling for the indirect effects through use level. Internalizing pathology potentiated the relation between consumption and consequences, whereas parental support and control mitigated this relation. Collectively, findings provided mixed support for the assertion that psychopathology would predict both use and problem use, whereas socialization factors would predict only use. (PsycINFO Database Record (c) 2010 APA, all rights reserved)