Experimental study of timers implemented in bipolar and cmos technologies

В данной статье исследуются микросхемы таймеров, выполненных по биполярной и КМОП технологиям. Приводятся расчеты, а также практическая реализация и результаты эксперимента. Делается вывод о том, какой из генераторов, в основе которых лежат таймеры, более долговечен и экономичен в отношении к потреблению электроэнергии.In this article, we study the timer ICs implemented in bipolar and CMOS technologies. Calculations of the circuit components are given, as well as practical implementation and experimental results. We determine which of the timers based generators is better with respect to energy consumption

Электроснабжение СДУ «Чирчикавтодор»

Объектом исследования является электрическая часть СДУ "Чирчикавтодор". Цель работы – проектирование схемы электроснабжения предприятия, выбор оборудования. В работе спроектирована схема электроснабжения от подстанции энергосистемы, до конечного электроприемника. Выбраны кабели и провода, коммутационное оборудование, были сделаны необходимые проверки.Object of a research is an electric part of SDU "Chirchikavtodor". The work purpose – projection of the scheme of power supply of the enterprise, the choice of an inventory. In work the scheme of power supply from substation of a power supply system, to the terminating electroreceiver is designed. Cables and wires, a switching inventory are chosen, necessary checks were made

Wiki-based Collaborative Learning Experience in a Foreign Language Blended Course

The article emphasizes the educational potential of wikis for learning foreign languages. It focuses on students’ collaboration based on integration of different types of activities within a highly motivating blended learning environment where learners can interact and share their ideas. The study aims to understand if wikis could enhance online collaboration and positively affect students’ attitudes to group work. It tries to explore the level of participation and contribution of students in wiki-based activities, as well as their attitude to this type of online collaboration

Математическое моделирование режимов работы двухфазного термосифона в условиях извлечения геотермальной энергии

Percutaneous treatment of thrombosed primary arteriovenous hemodialysis access fistulae.BackgroundWe reviewed the efficacy of percutaneous intervention in acute thrombotic occlusion of native arteriovenous (AV) fistulae for hemodialysis.MethodsEight-one percutaneous procedures were performed in 54 patients presenting with a clotted native dialysis fistula. There were 60 cases of a long-segment thrombosis of the fistula. In 20 cases, a small thrombus usually caused by an underlying severe stenosis was observed. A proximal arterial occlusion was seen in one case. Treatment depended on clot size and included balloon dilation (N = 20), mechanical thrombectomy with various devices (N = 58), as well as pharmacomechanical thrombolysis (N = 3).ResultsFull restoration of flow was established in 72 cases (88.9%). Early reobstruction within 14 days occurred in eight cases (11.1%). Primary patency rates after a 1-, 3-, 6-, and 12-month period were 74, 63, 52, and 27%, respectively. Overall fistula patency was 75% after 3 months, 65% after 6 months, 51% after 12 months, and 22% after 24 months.ConclusionsAcute thrombotic occlusion of native AV fistulae is a major complication of hemodialysis. The results of treatment are believed to be less successful than thrombosis treatment in synthetic grafts. Our results, however, indicate the efficacy of percutaneous treatment in native fistulae, and demonstrate comparable technical results and patency rates

Зарубежный и отечественный опыт допустимых значений индивидуального пожарного риска

Пожары всегда наносят ущерб, и часто этот ущерб не восполним, потому что уносит человеческие жизни. Проанализировав различные информационные ресурсы, установлено, что индивидуальный пожарный риск в России целесообразно принять на уровне не ниже 12•10{-6}/чел. год. На основании расчётов выявлено, что в похожих по климату на Россию развитых странах индивидуальный пожарный риск допустим и приемлем на этом уровне.Fires always cause damage, and often this damage is not replenished, because it takesaway human lives. Analyzing various information resources, it is established that the individual fire risk inRussia should be taken at a level no lower than 12•10{-6}/ person. year. Based on the calculations, it wasrevealed that in individual countries similar in climate to Russia, the individual fire risk is acceptable andacceptable at this level

How reliable is MRI in diagnosing cartilaginous lesions in patients with first and recurrent lateral patellar dislocations?

<p>Abstract</p> <p>Background</p> <p>Lateral dislocation of the patella (LPD) leads to cartilaginous injuries, which have been reported to be associated with retropatellar complaints and the development of patellofemoral osteoarthritis. Therefore, the purpose of this study was to determine the reliability of MRI for cartilage diagnostics after a first and recurrent LPD.</p> <p>Methods</p> <p>After an average of 4.7 days following an acute LPD, 40 patients (21 with first LPDs and 19 with recurrent LPDs) underwent standardized 1.5 Tesla MRI (sagittal T1-TSE, coronal STIR-TSE, transversal fat-suppressed PD-TSE, sagittal fat-suppressed PD-TSE). MRI grading was compared to arthroscopic assessment of the cartilage.</p> <p>Results</p> <p>Sensitivities and positive predictive values for grade 3 and 4 lesions were markedly higher in the patient group with first LPDs compared to the group with recurrent LPDs. Similarly, intra- and inter-observer agreement yielded higher kappa values in patients with first LPDs compared to those with recurrent LPDs. All grade 4 lesions affecting the subchondral bone (osteochondral defects), such as a fissuring or erosion, were correctly assessed on MRI.</p> <p>Conclusions</p> <p>This study demonstrated a comparatively good diagnostic performance for MRI in the evaluation of first and recurrent LPDs, and we therefore recommend MRI for the cartilage assessment after a LPD.</p