نتایج جستجو برای: failure mechanical

تعداد نتایج: 592744  

پایان نامه :وزارت بهداشت، درمان و آموزش پزشکی - دانشگاه علوم پزشکی و خدمات بهداشتی درمانی مشهد - دانشکده دندانپزشکی 1393

چکیده: مقدمه:از زمانی که پرسلن لامینت ونیرها معرفی شده اند، محبوبیت آن ها افزایش یافته است. آماده سازی دندان با استفاده از این روش، محافظه کارانه بوده و همچنین این رستوریشن ها، زیبا می باشند؛ اگرچه بعضی از مطالعات مشکلاتی را از جمله عدم تطابق مارجین و failure load پایین را برای آن ها گزارش کرده اند. جهت ساخت لامینت تراش دندان باید در مینا باشد و عاج را در برنگیرد. در نتیجه محدودیت هایی درباره ...

2016
Luigi Camporota Nicholas Barrett

Mechanical ventilation in patients with respiratory failure has been associated with secondary lung injury, termed ventilator-induced lung injury. Extracorporeal venovenous carbon dioxide removal (ECCO2R) appears to be a feasible means to facilitate more protective mechanical ventilation or potentially avoid mechanical ventilation in select patient groups. With this expanding role of ECCO2R, we...

2017
Viacheslav Slesarenko Nikita Kazarinov Stephan Rudykh

The superior mechanical properties of biological materials originate in their complex hierarchical microstructures, combining stiff and soft constituents at different length scales. In this work, we employ a three-dimensional multi-materials printing to fabricate the bio-inspired staggered composites, and study their mechanical properties and failure mechanisms. We observe that bioinspired stag...

2012
Abha Gupta Melania Bembea Anna Brown Courtney Robertson Lewis Romer Ronald D. Cohn

Human metapneumovirus (HMPV) is a common virus that can cause respiratory problems ranging from mild upper respiratory tract disease to respiratory failure requiring mechanical support. Here, we report a case of a 32-month-old male with a previous history of asthma, who developed respiratory failure two weeks after onset of cough and rhinorrhea and required extracorporeal membrane oxygenation (...

2013
Paolo Scarpazza Cristoforo Incorvaia Chiara Melacini Roberta Cattaneo Cristiano Bonacina Gian Galeazzo Riario-Sforza Walter Casali

Noninvasive ventilation (NIV) was introduced as an alternative to invasive mechanical ventilation for acute respiratory failure caused from exacerbations of chronic obstructive pulmonary disease in the 1980s, and its use gradually rose worldwide. Seventy-eight patients (57 males, mean age 78.3 ± 9.2 years) undergoing NIV were evaluated. Of them, 48 (62.3%) had acute hypercapnic respiratory fail...

پایان نامه :وزارت علوم، تحقیقات و فناوری - دانشگاه صنعتی امیرکبیر(پلی تکنیک تهران) - دانشکده مهندسی برق 1386

یکی از دلایل اضافه ولتاژ، برخورد صاعقه به خط انتقال می باشد. صاعقه در صورت برخورد به سیم گارد و برخورد به فاز می تواند ایجاد خطر نماید. با برخورد صاعقه به سیم گارد، اضافه ولتاژ کمتری شاهد خواهیم بود. ازاینرو استفاده از سیم گارد در خطوط انتقال الزامی می باشد. اگر برخورد به سیم گارد باعث ایجاد back flashover شود، سیستم را دچار تنش خواهد کرد. در حالتی دیگر نیز اگر صاعقه به فاز برخورد نماید (sheild...

Journal: :international journal of advanced design and manufacturing technology 0
suresh babu valeru mr tarasasanka cherukuri mr

in this study, behavior of pin-loaded glass fiber reinforced with polyethylene laminated composites with different stacking sequence and different dimensions has been observed experimentally and stress analysis was performed using ansys software. the aim is to investigate stresses, failure strength and failure mode of composite laminates containing a pin loaded hole when the material exhibits l...

Journal: :Journal of experimental zoology. Part A, Ecological genetics and physiology 2013
Paul M Magwene John J Socha

Turtle shells are a form of armor that provides varying degrees of protection against predation. Although this function of the shell as armor is widely appreciated, the mechanical limits of protection and the modes of failure when subjected to breaking stresses have not been well explored. We studied the mechanical properties of whole shells and of isolated bony tissues and sutures in four spec...

2016
Kyoung Min Moon Min Soo Han Ch'ang Bum Rim Jun Ho Lee Min Seok Kang Ji Hye Kim Sang Il Kim Sun Young Jung Yongseon Cho

BACKGROUND The purpose of this study was to evaluate the risk factors for mechanical ventilation in the patients with scrub typhus admitted to intensive care unit (ICU) at a university hospital. METHODS We retrospectively selected and analyzed clinical data from the medical records of 70 patients (32 men, 38 women) admitted to the ICU with scrub typhus between 2004 and 2014. The patients had ...

Journal: :Current opinion in critical care 2009
Scott K Epstein

PURPOSE OF REVIEW In intubated patients, mechanical ventilation offers essential ventilatory support, while the respiratory system recovers from acute respiratory failure. Yet, invasive mechanical ventilation is associated with risks and complications that prolong the duration of mechanical ventilation and increase the risk for death. Therefore, safely weaning the patient from the ventilator as...

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