Международная команда ученых разработала защитную ткань-трансформер, которая способна менять свою внутреннюю структуру. Она напоминает старинную кольчугу – частицы материала расположены близко друг к другу, что позволяет блокировать внешние механические воздействия.
Разработчики – ученые сингапурского Наньянского и Калифорнийского технологических университетов. Доцент Ван Ифань рассказал, что на создание материала команду его коллег действительно вдохновило устройство древней защитной кольчуги.
Отдельные элементы ткани в форме октаэдра печатают на 3D-принтере из нейлона и соединяют в кольчугообразную структуру. Полученный материал инкапсулируют в пластиковую оболочку и уплотняют воздействием вакуума. Подобный метод повышает плотность упакованных элементов и позволяет частицам интенсивно контактировать друг с другом, вследствие чего жесткость структуры возрастает в 25 раз.
Испытания дали следующие результаты. Ткань смогла удержать груз в 1,5 кг или в 50 раз больше собственного веса при натягивании ее на плоский предмет. В исходном состоянии структура ткани деформировалась на 26 мм при сбрасывании на нее небольшого стального мяча. Материал подбросил мяч за счет перехода структуры из мягкого состояния в жесткое, что деформировало ее всего лишь на 3 мм.
В последующих опытах нейлон заменили на алюминий, в результате чего жесткость материала стала намного выше, чем в случае с нейлоном. При этом нейлон и алюминий имеют одинаковые характеристики мягкости.
Ученые считают, что металлическая версия подойдет для изготовления пуленепробиваемых жилетов, экзоскелетов и адаптивных медицинских шин, меняющих параметры жесткости по мере восстановления костной ткани.
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Athletes take authorized steroids in Australia, that are
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Nonetheless, earlier reviews do observe oedema and hyperaemia shortly after beginning AAS administration, however subsiding afterwards.
Importantly, individuals didn’t self-report adjustments in voice, highlighting that these adjustments can occur steadily and unnoticed.
Some preliminary information regarding the time course of HPGA recovery after AAS use have just
lately been revealed (176). When gonadal function was normal earlier than an AAS cycle, there
was a 90% likelihood of having regular testosterone levels
three months after cessation and a 100% chance at the finish of
follow-up (1 year after the start of the cycle). At the group degree, mean testosterone ranges returned to baseline three months after cessation. Importantly, 37% of the themes had signs of abnormal gonadal operate at baseline of which 95% had a historical past of AAS use.
This could be explained by incomplete restoration of the HPGA as a end result of current AAS use or extended or persistent hypogonadism from past use.
Selective Androgen Receptor Modulators (SARMs) have
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boys who’re partaking in weight-lifting ought
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Many anabolic steroids don’t trigger this conversion and the
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The misuse of anabolic steroids for enhancing physical efficiency or aesthetic appearance just isn’t only unlawful but also carries important
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This section of the EDE-Q requested individuals to indicate what quantity of occasions they’ve engaged
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Purging behaviours have been measured by totalling the responses for questions analyzing the frequency of self-induced vomiting and laxative use as a
measure of controlling weight and form. As previously mentioned, the EDE-Q has demonstrated good reliability for Australian adolescent populations [43].
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