ADHD and College Students: Exploratory and Confirmatory Factor Structures With Student and Parent Data.

Exploratory factor analyses (EFAs) and confirmatory factor analyses (CFAs) were used to investigate the structure of the Student Report Inventory (SRI) and Parent Report Inventory (PRI) of the College Attention-Deficit/Hyperactivity Disorder (ADHD) Response Evaluation. The sample was composed of 1,080 college students and their parents and was stratified by ethnicity, gender, ability level, age, grade, region of residence, and psychoeducational classification status. Results varied according to the information source (self-report vs. parent). EFA uncovered and CFA confirmed 3 distinct and reliable dimensions for student reports: Inattention, Hyperactivity, and Impulsivity. By contrast, EFA and CFA uncovered a reliable 2-dimension structure for the parent-report data. Factor structures replicated across genders (3 factors for the SRI, and 2 factors for the PRI). Results are discussed in terms of the divergence of structures. (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

Substrate current based avalanche multiplication measurement in 120 GHz SiGe HBTs

A new substrate current-based technique for measuring the avalanche multiplication factor (M - 1) in high-speed SiGe heterojunction bipolar transistors (HBTs) is proposed. The technique enables M - 1 measurement at high operating current densities required for high-speed operation, where conventional techniques fail because of self-heating. Using the proposed technique, M - 1 was measured up to 10 mA//spl mu/m/sup 2/ on SiGe HBTs featuring 120 GHz peak f/sub T/ which occurs at J/sub C/ about 7 mA//spl mu/m/sup 2/. Implications for circuit applications are also discussed.     

The relevance of Sigmund Freud for the 21st century.

This special issue of Psychoanalytic Psychology celebrates the 150th anniversary of the birth of Sigmund Freud on May 6, 1856. The 15 papers and one book review in different ways address the question of Freud's continued relevance. The contributors to this special issue approach the topic in multiple ways. Some authors stay close to the question, while other authors write on topics dear to them. All are, nonetheless, distinguished contributors to contemporary psychoanalysis and most need no introduction to the readership of this journal. Individual contributions to the special issue are summarized. (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

Plasma-assisted co-evaporation of β-indium sulfide thin films

This paper describes the development of plasma-assisted co-evaporation (PACE) for the formation of β-In₂S₃ thin films. Indium was supplied by conventional thermal evaporation, while the chalcogen gas precursor (H₂S) was activated using an inductively coupled plasma (ICP) source. Using a combination of optical emission spectroscopy and mass spectrometry it was shown that the ICP effectively dissociated H₂S, producing atomic sulfur. Transport modeling was used to quantify the flux distributions of the co-evaporated metal and the plasma-generated species impinging the substrate. Model predictions were validated by measurements of deposition rate and film properties. Substantial improvements in both materials utilization and substrate temperature reduction were realized with respect to conventional co-evaporation. β-In₂S₃ was formed as low as 100 °C and it was observed that quality was a strong function of S/In ratio. The grain size decreased and the optical band gap increased as the substrate temperature was reduced.     

Identification of key volatiles responsible for odour quality differences in popped popcorn of selected hybrids

Volatile compounds from six hot-air-popped popcorn hybrids, being also classified into three types, were evaluated by a gas chromatograph equipped with a mass spectrometer (GC/MS). In addition, 68 panelists determined odour quality differences of the popped kernels by an aroma ranking test. Total number of volatiles detected by GC/MS were 195, of which 51 peaks were positively identified, 92 peaks were tentatively identified, and 52 peaks were unidentified. The relationships between quality/quantity of volatiles and sensory results revealed that 2-acetylpyridine was considered to contribute to the overall popped popcorn aroma quality favorably or not adversely. However, 2,5-dimethylpyrazine, (E,E)-2,4-decadienal, 2-methylpyrazine, ethylpyrazine, 2-ethyl-5-methylpyrazine and 3-ethyl-2, 5-dimethylpyrazine were found to be important popcorn volatiles, but to contribute negatively to characteristic popped popcorn odour. Numerous other volatiles such as 2-furfurylthiol (2-furanmethanthiol), pyrrole, 3-(methylthio)propanal (methional), 3-furaldehyde, 4-vinyl-2-methoxyphenol (4-vinylguaiacol), 2-pentylfuran, 2-furanmethanol (furfuryl alcohol), hexanal, 1-pentanol, 2-methyl-5-vinylpyrazine, 2-methoxyphenol (guaiacol), 2-acetylpyrrole and others may be responsible in part of typical popcorn aroma characteristics.     

Conceptualizing and measuring counselors' theoretical orientation.

This review discusses issues in conceptualizing and measuring counselors' theoretical orientations to practice. Two dimensions of counselor theoretical orientation seem to emerge in several studies: an Analytical-Experiential dimension and an Objective-Subjective dimension. Fifteen instruments previously proposed as measures of counselors' and therapists' theoretical orientations are evaluated. Psychometric properties and the utility of each instrument are critically examined. Few instruments show evidence of reliability and even fewer have been shown to have evidence of validity. (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

FORECASTING GLOBAL ICE VOLUME

Abstract. Forecasts and associated probability limits of total ice volume for the next 100 000 years are found based upon a historical record of 440 000 years of oxygen-18 from deep sea cores. The forecasts are found using two different time series models, one based on the assumption that ice volume contains deterministic sinusoids, and one assuming that the record contains 'disturbed periodicities', i.e. the sinusoids do not have the same cycle length and amplitude from one cycle to another. The results for the two models are seen to be very similar, with both predicting a small probability for a future ice volume event to be as large as the last ice age, which was one of the largest glaciations of the last 2 million years.     

Dietary fibre: The use of in-vitro and rat models to predict action on stool output in man

An in-vitro model (fermentation and water holding capacity measurement) and a rat model were compared for their ability to predict the action of dietary fibre on stool output in man. A range of different purified or semipurified fibres were studied: wheat bran, pectin, carboxymethylcellulose, xanthan, guar, karaya, tragacanth and gellan. Using equations derived from previous studies, prediction indices from in-vitro studies were compared with the effects of these fibres on stool output in rat and man. The rat model was better as a predictor for stool output (r = 0.94, P < 0.005) in man but the log in-vitro predictive index was significantly correlated with stool output in both rat (r = 0.87, P < 0.02) and man (r = 0.84, P < 0.04). Since in-vitro methods are less expensive and time consuming than animal studies, the log in-vitro predictive index may provide a useful pre-screening device for new dietary fibre sources or detecting changes in the action of dietary fibres during the manufacturing process.     

Extensively coated femoral components in young patients

A review of 174 hips in 154 patients younger than 50 years of age who underwent primary total hip arthroplasty with a cementless acetabular component and an extensively coated femoral component done by one surgeon was performed to determine whether this method of fixation improves the results of previously reported comparable series using different methods of fixation. The average age was 37.6 years. The average followup was 8.3 years (range, 2-13 years). Eighty-eight hips had at least 10 years followup. Sixteen (9%) hips had severe stress shielding. There were 13 (7.5%) acetabular failures. Of 144 porous coated cups, three were revised for wear and one for dislocation. Another was revised 11 years postoperatively for late loosening secondary to catastrophic acetabular lysis. Excluding the bipolar and threaded components (30 hips), five (3.4%) porous coated cups were revised for failure. Of the 174 fully coated stems, 99.4% had stable fixation, 167 (96%) were ingrown, six (3.4%) had stable fibrous fixation, and one (0.6%) was unstable. Two (1.1%) femoral stems were revised. The total rate of osteolysis was 4%. Cementless extensively porous coated stems and porous coated acetabuli give excellent lasting results in young patients.