Динамика частотного реверса асинхронного двигателя

Для исследования реверсирования асинхронного двигателя сравниваются два способа частотной и противовключением. Анализируются различные законы изменения частоты статора и их влияние на быстродействие, пульсации момента, плавность

Using breath carbon monoxide to validate self-reported tobacco smoking in remote Australian Indigenous communities

Background: This paper examines the specificity and sensitivity of a breath carbon monoxide (BCO) test and\ud optimum BCO cutoff level for validating self-reported tobacco smoking in Indigenous Australians in Arnhem Land,\ud Northern Territory (NT).\ud \ud Methods: In a sample of 400 people (≥16 years) interviewed about tobacco use in three communities, both selfreported\ud smoking and BCO data were recorded for 309 study participants. Of these, 249 reported smoking tobacco\ud within the preceding 24 hours, and 60 reported they had never smoked or had not smoked tobacco for ≥6\ud months. The sample was opportunistically recruited using quotas to reflect age and gender balances in the\ud communities where the combined Indigenous populations comprised 1,104 males and 1,215 females (≥16 years).\ud Local Indigenous research workers assisted researchers in interviewing participants and facilitating BCO tests using\ud a portable hand-held analyzer.\ud \ud Results: A BCO cutoff of ≥7 parts per million (ppm) provided good agreement between self-report and BCO\ud (96.0% sensitivity, 93.3% specificity). An alternative cutoff of ≥5 ppm increased sensitivity from 96.0% to 99.6% with no change in specificity (93.3%). With data for two self-reported nonsmokers who also reported that they smoked\ud cannabis removed from the analysis, specificity increased to 96.6%.\ud \ud Conclusion: In these disadvantaged Indigenous populations, where data describing smoking are few, testing for\ud BCO provides a practical, noninvasive, and immediate method to validate self-reported smoking. In further studies\ud of tobacco smoking in these populations, cannabis use should be considered where self-reported nonsmokers\ud show high BCO

Curriculum, collateral and collaboration: Addressing alcohol and social norms in an Australian high school setting

There is a commonly held perception that the majority of Australian teenagers drink alcohol, and a perceived \u27social norm\u27 among teenagers that their peers are drinkers and expect them to be drinkers. However, results of the Australian Secondary Schools Alcohol and Drug (ASSAD) Survey, conducted every three years since 1984, show a decline in the proportion of teenagers who are regular drinkers; from 30% of 12-15 year olds in 1984 to 11% in 2011, and 50% of 16-17 years olds in 1984 down to 33% in 2011 (White & Bariola, 2012). The \u27Alcohol and Social Norms Project\u27 conducted in a municipal high school aims to correct misperceptions held by students and the school community regarding teenagers and alcohol and to foster an environment which supports young people\u27s decisions not to drink. That is, this social norms campaign is based on the evidence that the harmful behaviour of underage drinking occurs far less than what most people believe; it is indeed these beliefs themselves which have been found to be the precursor to behavioural intention and behaviour (Azjen, 1981) which is the focus of this paper

Curriculum, Collateral and Collaboration: Addressing Alcohol and Social Norms in an Australian High School Setting

There is a commonly held perception that the majority of Australian teenagers drink alcohol, and a perceived ‘social norm’ among teenagers that their peers are drinkers and expect them to be drinkers. However, results of the Australian Secondary Schools Alcohol and Drug (ASSAD) Survey, conducted every three years since 1984, show a decline in the proportion of teenagers who are regular drinkers; from 30% of 12-15 year olds in 1984 to 11% in 2011, and 50% of 16-17 years olds in 1984 down to 33% in 2011 (White & Bariola, 2012). The ‘Alcohol and Social Norms Project’ conducted in a municipal high school aims to correct misperceptions held by students and the school community regarding teenagers and alcohol and to foster an environment which supports young people’s decisions not to drink. That is, this social norms campaign is based on the evidence that the harmful behaviour of underage drinking occurs far less than what most people believe; it is indeed these beliefs themselves which have been found to be the precursor to behavioural intention and behaviour (Azjen, 1981) which is the focus of this paper

Влияние электронно-пучковой обработки на структурно-фазовые состояния сплава TiNi С покрытием из Ta

After the electron beam processing on the alloy TiNi with tantalum coating it was developed, that the amount of betta-Ta phase increases in modified layer, the phase state changes with the appearance of B19' martensite phase