Разработка системы импульсного питания сварной дуги с разделением токоподвода к изделию

Объектом исследования является: процесс сварки неплавящимся электродом в аргоне. Предмет исследования ? сварочная дуга горящая в импульсном режиме на постоянном токе. Цель работы ? является исследование и разработка системы импульсного питания сварной дуги с разделением токоподвода к изделию. В процессе исследования проводились анализ методов повышения эффективности и способы сварки неплавящимся электродом с применением импульсного питания сварочной дуги, проведен анализ сварки модулированным током и предложен наиболее перспективный способ. В результате исследования разработана принципиальная электрическая схема модулятора обеспечивающее двойной токоподвод к изделию.Object of research: the process of Non-consumable Electrode Arc welding in argon. Subject of research: welding arc burning in the pulsed mode at direct current. Purpose of research: is the research and development of a pulsed power supply system for a welded arc with the separation of the current lead to the product. In the process of the investigation, methods of increasing efficiency and methods for welding with a non-consumable electrode were analyzed using pulse welding arc welding, an analysis of modulated current welding was performed and the most promising method was proposed. Results of research: a basic electrical circuit of the modulator was developed to provide a double current lead to the product

Including a pen and/or cover letter, containing social incentive text, had no effect on questionnaire response rate : a factorial randomised controlled Study within a Trial [version 1; peer review: awaiting peer review]

Background: Postal questionnaires are frequently used in randomised controlled trials to collect outcome data on participants; however, poor response can introduce bias, affect generalisability and validity, and reduce statistical power. The objective of this study was to assess whether a pen and/or social incentive text cover letter sent with a postal follow-up questionnaire increased response rates in a trial. Method: A two-by-two factorial randomised controlled trial was embedded within the OTIS host trial. Participants due their 12-month (final) follow-up questionnaire were randomised to be sent: a pen; a social incentive text cover letter; both; or neither. The primary outcome measure was the proportion of participants in each group who returned the questionnaire. Secondary outcomes were: time to return, completeness of the questionnaire, necessity of a reminder letter, and the cost effectiveness. Results: The overall 12-month questionnaire response rate was 721 out of 755 (95.5%). Neither the pen nor social incentive cover letter had a statistically significant effect on response rate: pen 95.2% vs. no pen 95.8%, adjusted OR 0.90 (95% CI 0.45 to 1.80; p=0.77); social incentive cover letter 95.2% vs. no social incentive cover letter 95.8%, adjusted OR 0.84 (95% CI 0.42 to 1.69, p=0.63). No statistically significant differences were observed between either of the intervention groups on time to response, need for a reminder or completeness. Therefore, neither intervention was cost-effective. Conclusions: We found no evidence of a difference in response rates associated with the inclusion of a pen and/or social incentive cover letter with the final follow-up postal questionnaire of the host trial. However, when these results are combined with previous SWATs, the meta-analysis evidence remains that including a pen increases response rates. The social incentive cover letter warrants further investigation to determine effectiveness

Balıkçının hikâyesi

İzmir’den Ayşe Hafize'nin Çocuk Duygusu'nda tefrika edilen Balıkçının Hikâyesi adlı romanıTefrika yarım kalmıştır. Arşivdeki eksikler nedeniyle tefrikanın tamamlanıp tamamlanmadığı bilinmemektedir

Arsen Lüpen’in sergüzeştinden: duvardaki akisler

Maurice Leblanc'ın İleri'de yayımlanan Arsen Lüpen’in Sergüzeştinden: Duvardaki Akisler adlı romanının ilk ve son tefrikalar

Сomparison of Exams in Terms of Benefits for the Future Engineer

This article describes advantages and disadventages of international exams for students. to motivate students to pass the English exam as soon as possible. Based on our survey, many students have never even heard about language exams and benefits it gives

Male-specific deficits in natural reward learning in a mouse model of neurodevelopmental disorders

Neurodevelopmental disorders, including autism spectrum disorders, are highly male biased, but the underpinnings of this are unknown. Striatal dysfunction has been strongly implicated in the pathophysiology of neurodevelopmental disorders, raising the question of whether there are sex differences in how the striatum is impacted by genetic risk factors linked to neurodevelopmental disorders. Here we report male-specific deficits in striatal function important to reward learning in a mouse model of 16p11.2 hemideletion, a genetic mutation that is strongly associated with the risk of neurodevelopmental disorders, particularly autism and attention-deficit hyperactivity disorder. We find that male, but not female, 16p11.2 deletion animals show impairments in reward-directed learning and maintaining motivation to work for rewards. Male, but not female, deletion animals overexpress mRNA for dopamine receptor 2 and adenosine receptor 2a in the striatum, markers of medium spiny neurons signaling via the indirect pathway, associated with behavioral inhibition. Both sexes show a 50% reduction of mRNA levels of the genes located within the 16p11.2 region in the striatum, including the kinase extracellular-signal related kinase 1 (ERK1). However, hemideletion males show increased activation in the striatum for ERK1, both at baseline and in response to sucrose, a signaling change associated with decreased striatal plasticity. This increase in ERK1 phosphorylation is coupled with a decrease in the abundance of the ERK phosphatase striatum-enriched protein-tyrosine phosphatase in hemideletion males. In contrast, females do not show activation of ERK1 in response to sucrose, but notably hemideletion females show elevated protein levels for ERK1 as well as the related kinase ERK2 over what would be predicted by mRNA levels. These data indicate profound sex differences in the impact of a genetic lesion linked with neurodevelopmental disorders, including mechanisms of male-specific vulnerability and female-specific resilience impacting intracellular signaling in the brain

The Symbolic Dimensions of Workplace Evaluations

Post-Occupancy Evaluation (POE) techniques have been used during the past twenty years in a variety of workplace settings to measure specific occupant responses to the physical dimensions of the office environment. Typically, these measures have been used by environmental researchers and designers to improve instrumental aspects of the workplace, such as increased levels of occupant satisfaction with lighting, temperature, privacy, and office configuration. A growing body of evidence has begun to suggest that while instrumental approaches to workplace evaluation have produced improvements in specific office conditions, overall levels of worker satisfaction and perceptions of the general character of the office setting remain low. It has also been suggested that future pressures for reconfiguring the workplace -- increased use of individual communication technologies, working away from the office setting, rapid and continual changes in working patterns - will exacerbate these negative perceptions of workers. This paper will suggest ways in which POEs can be employed to identify and measure the less tangible aspects of office setting and how this information can be used to enhance the designers ability to address the cultural and social dimensions of the workplace. The central thesis of this paper is that POE theories and research methodologies must be focused on the symbolic dimensions of the workplace (i.e., office image, organizational culture, work purpose) in order to understand the ways in which the environment contributes to specific improvements in worker productivity, health, and satisfaction. Data will be presented from the author's recent POE studies of governmental offices and published supporting material found in Environment and Behaviour and The Journal of Architectu-ral and Planning Research. The author has conducted evaluation and programming studies for a number of private and governmental client groups in both office and health-care settings during the past fifteen years, and he will use evidence from this body of work as well as parallel studies of colleagues to support the thesis of the paper

Neuropsychologische und elektrophysiologische Untersuchungen zu rezeptiven und expressiven musikalischen Teilleistungsstörungen nach Schlaganfällen

Einführung: Der Verlust musikalischer Funktionen nach Hirninfarkten bleibt meist unentdeckt. Obwohl der sensorische und motorische Ausfall von musikalischen Leistungen die Patienten vorwiegend emotional stark einschränkt, fehlten sensitive neuropsychologische Testverfahren bisher völlig. Ziel dieser Untersuchung war es die Abhängigkeit unterschiedlicher musikalischer rezeptiver und expressiver Verarbeitungsstörungen von der Lokalisation der Hirnläsion und der musikalischen Vorbildung zu zeigen und den Ergebnissen gesunder Probanden gegenüberzustellen. Methode: Die rezeptive neuropsychologische Testung wurde mit einer neu entwickelten Bedside-Testbatterie an 14 Schlaganfallpatienten und 14 gesunden Kontrollen für die Kategorien Intervall, Melodie, Rhythmus und Metrumdiskrimination durchgeführt. Der Proband sollte hierfür kurze Musiksequenzen als gleich oder ungleich unterscheiden. Im expressiven Teil mussten kurze Rhythmussequenzen gespielt und Melodien gesungen werden. Bei 8 dieser Patienten wurden zusätzlich in der Präsentation ereigniskorrelierte Potentiale mit dem EEG abgeleitet. Ergebnisse: Die Patienten zeigten erhebliche Einbußen in der musikalischen Wahrnehmung und Produktion. Die expressiven Leistungen lagen über den rezeptiven. Eine Hemisphärendominanz in der unterschiedlichen musikalischen Teilverarbeitung konnte nicht bestätigt werden. Patienten mit musikalischer Ausbildung waren in ihren Ergebnissen von gesunden Probanden ohne musikalische Ausbildung nicht zu unterscheiden. Die Patienten benötigten für die Musikwahrnehmung in allen Untertests mehr frontale kortikale Aktivierung, speziell in der ersten Einprägungsphrase, während die Kontrollen in der zweiten Vergleichsequenz einen Potentialzuwachs aufwiesen. Schlussfolgerung: Es scheint, dass selbst nur kurze Episoden einer aktiven musikalischen Ausbildung ausreichen, um multiple Repräsentationen neuronaler Netzwerke zu schaffen, die Störungen der Musikwahrnehmung oder Musikproduktion nach einer Hirnläsion teilweise kompensieren