542 research outputs found
Pioneering Extension Nutrition Education with iPad Apps: A Development Story
Technology can be an effective vehicle for Extension nutrition education. Body Quest: Food of the Warrior is a childhood obesity prevention initiative of the Alabama Cooperative Extension System that successfully incorporates technology in the classroom. With Body Quest, students learn about healthful eating through blended learning involving both classroom instruction and self-directed e-learning via apps. Seven iPad apps excite students and engage them in the learning process. Extension professionals can benefit from our lessons learned for creating a successful app
Evaluation of the Internal Consistency, Factor Structure, and Validity of the Depression Change Expectancy Scale
The psychometric properties and predictive validity of the Depression Change Expectancy Scale (DCES), a modification of an expectancy scale originally developed for patients with anxiety disorders, were examined in two studies. In Study 1, the 20-item scale was administered along with a battery of questionnaires to a sample of 416 dysphoric undergraduate students and demonstrated good internal consistency. A two-factor solution most parsimoniously accounted for the variance, with one factor containing all pessimistically worded items (DCES-P) and the second containing all optimistically worded items (DCES-O). The DCES-P showed patterns of correlations with other measures of related constructs consistent with hypothesized relationships; the DCES-O showed similar, but weaker, relationships with the other measures. Multilevel modeling was used to examine the predictive utility of the DCES in a clinical sample of 63 adults (Study 2). Improved depressive symptoms (over 6 weeks) were strongly associated with optimistic expectancies but were unrelated to pessimistic expectancies for change. The DCES appears to be a promising measure of expectancies for improvement among individuals with depressive symptoms
Coherent control of the cooperative branching ratio for nuclear x-ray pumping
Coherent control of nuclear pumping in a three level system driven by x-ray
light is investigated. In single nuclei, the pumping performance is determined
by the branching ratio of the excited state populated by the x-ray pulse. Our
results are based on the observation that in ensembles of nuclei, cooperative
excitation and decay leads to a greatly modified nuclear dynamics, which we
characterize by a time-dependent cooperative branching ratio. We discuss
prospects of steering the x-ray pumping by coherently controlling the
cooperative decay. First, we study an ideal case with purely superradiant decay
and perfect control of the cooperative emission. A numerical analysis of x-ray
pumping in nuclear forward scattering with coherent control of the cooperative
decay via externally applied magnetic fields is presented. Next, we provide an
extended survey of nuclei suitable for our scheme, and propose
proof-of-principle implementations already possible with typical M\"ossbauer
nuclear systems such as . Finally, we discuss the application
of such control techniques to the population or depletion of long-lived nuclear
states.Comment: 11 pages, 8 figures; updated to the published versio
Mineralisation of surfactants using ultrasound and the Advanced Fenton Process
The destruction of the surfactants, sodium dodecylbenzene sulfonate (DBS) and dodecyl pyridinium chloride (DPC), using an advanced oxidation process is described. The use of zero valent iron (ZVI) and hydrogen peroxide at pH = 2.5 (the advanced Fenton process), with and without, the application of 20 kHz ultrasound leads to extensive mineralisation of both materials as determined by total organic carbon (TOC)measurements. For DBS, merely stirring with ZVI and H2O2 at 20°C leads to a 51% decrease in TOC, but using 20 kHz ultrasound at 40°C, maintaining the pH at 2.5 throughout and adding extra amounts of ZVI and H2O2 during the degradation, then the extent of mineralisation of DBS is substantially increased to 93%. A similar result is seen for DPC where virtually no degradation occurs at 20°C, but if extra amounts of both ZVI and hydrogen peroxide are introduced during the reaction at 40°C and the pH is maintained at 2.5, then an 87% mineralisation of DPC is obtained. The slow latent remediation of both surfactants and the mechanism of degradation are also discussed
Алгоритм диагностики и лечения отравления грибами
Facultatea de Medicina “Victor Papilian”, Sibiu, România, Spitalul Militar de Urgenţă, Sibiu, România, Conferinţa Ştiinţifico-Practică „Medicina modernă, actualităţi şi perspective”, consacrată aniversării de 40 de ani ai Spitalului Clinic al Ministerului Sănătăţii, 27-28 mai, 2010, Chişinău, Republica MoldovaSince information about natural exposures is often insufficient and incorrect, a new syndromic classification of mushroom poisoning is
recommended to guide clinicians in making earlier diagnoses – especially in cases where only advanced critical care, including liver transplantation,
may be life saving. In 2005, Diaz proposed a classification system based on presentation timing and target organ systemic toxicity (14 major
syndromes, 4 new syndromes). The diagnosis is based on clinical evaluation and urinary amatoxin evaluation. The treatment objectives are: to
prevent absorption of the toxin from the gastrointestinal tract and to promote elimination from the systemic circulation (primary and secondary
detoxification); regarding amatoxin poisoning, to lower the serum concentration of amanitin as soon as possible and thereby shorten the period
of time that hepatocytes and renal tubular cells are exposed (extracorporeal detoxification and liver transplant).Отсутствие в настоящее время систематизированной информации об отравлении грибами вызвало необходимость разработки
новой классификации для оказания помощи врачам в ранней диагностике. В 2005 году Диас предложил классификацию отравлений
грибами на основе двух критериев: скорость проявления симптомов интоксикации и системная токсичность. Позитивная диагностика
основывается на клинической оценке и определении мочевого аматоксина. Целью лечения является: предотвращение всасывания
токсинов из желудочно-кишечного тракта, а также первичная и вторичная детоксикация системы кровообращения
Cooperative effects in nuclear excitation with coherent x-ray light
The interaction between super-intense coherent x-ray light and nuclei is
studied theoretically. One of the main difficulties with driving nuclear
transitions arises from the very narrow nuclear excited state widths which
limit the coupling between laser and nuclei. In the context of direct
laser-nucleus interaction, we consider the nuclear width broadening that occurs
when in solid targets, the excitation caused by a single photon is shared by a
large number of nuclei, forming a collective excited state. Our results show
that for certain isotopes, cooperative effects may lead to an enhancement of
the nuclear excited state population by almost two orders of magnitude.
Additionally, an update of previous estimates for nuclear excited state
population and signal photons taking into account the experimental advances of
the x-ray coherent light sources is given. The presented values are an
improvement by orders of magnitude and are encouraging for the future prospects
of nuclear quantum optics.Comment: 22 pages, 4 figures, 5 tables; updated to the published version, one
additional results tabl
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