نتایج جستجو برای: bed

تعداد نتایج: 49269  

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

تقاضا برای اُلفین های (آلکِن های) سبک مانند پروپن، بوتن و ایزوبوتن و محصولاتی که از این اُلفین ها تولید می شود، بالا و رو به فزونی است. چون منابع فسیلی (طبیعی) فاقد الفین های سبک می باشند و بیشتر آنها شامل هیدروکربن های اشباع شده و آروماتیکها می باشد، روش های سنتزی برای تولید اُلفین های سبک اجتناب ناپذیر است. یکی از راههای تولید اُلفینهای سبک، هیدروژن زدایی آلکان متناظر- حذف یک مولکول - با آنها می ب...

Journal: :Journal of environmental health 2015
Mary Beth Kaylor Paul Wenning Christopher Eddy

Recent research suggests that the resurgence of bed bugs in the U.S. has occurred at an alarming rate. Assumptions have been made that socioeconomic status is not associated with the prevalence of bed bug infestations. Little information is available at the local level, however, about the prevalence of bed bugs in private homes. The authors' pilot study aimed to identify prevalence, knowledge, ...

Journal: :iranian journal of chemistry and chemical engineering (ijcce) 2004
mohammad reza ehsani hasan behbahani mohammad jamialahmadi

the presence of particles in liquid-solid fluidized beds enhances the bed heat transfer, because the movement of the particles leads to an increased turbulence in the system. moreover, the violent movement of the particles has a positive effect on fouling of the heat transfer surface. the aim of this investigation was to perform systematic measurements of bed voidage and heat transfer coefficie...

Journal: :Canadian journal of public health = Revue canadienne de sante publique 2012
Mona Shum Elizabeth Comack Taz Stuart Reg Ayre Stéphane Perron Shelley A Beaudet Tom Kosatsky

OBJECTIVE To share four Canadian cities' experiences with bed bug infestations and to explore public health roles in managing them. METHODS We summarize presentations from a workshop at the 2010 Canadian Public Health Association Conference which examined the re-emergence of bed bugs in Canada and compared management approaches of municipal and public health authorities in four large Canadian...

2011
Stephen L. Doggett Christopher J. Orton David G. Lilly Richard C. Russell

Australia has experienced a sudden and unexpected resurgence in bed bug infestations from both Cimex lectularius L. and Cimex hemipterus F. A survey in 2006 revealed that infestations had increased across the nation by an average of 4,500% since the start of the decade. In response, a multi-disciplinary approach to combat the rise of this public health pest was implemented and involved the coor...

پایان نامه :وزارت علوم، تحقیقات و فناوری - دانشگاه سیستان و بلوچستان - دانشکده مهندسی 1392

flow in natural river bends is a complex and turbulent phenomenon which affects the scour and sedimentations and causes an irregular bed topography on the bed. for the reason, the flow hydralics and the parameters which affect the flow to be studied and understand. in this study the effect of bed and wall roughness using the software fluent discussed in a sharp 90-degree flume bend with 40.3cm ...

Journal: :Journal of applied physiology 2016
Patrik Sundblad Oleg Orlov Oliver Angerer Irina Larina Ronita Cromwell

Journal: :ESA bulletin. Bulletin ASE. European Space Agency 2001
D Schmitt B Elmann-Larsen

The microgravity experienced during space flight induces physiological changes that affect astronauts' health and performance. Simulations such as prolonged bed rest can mimic some of these changes and provide study conditions that are more accessible than during space flight itself. Previous studies, including several long and short-term bed-rest campaigns supported by ESA, have yielded signif...

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