IEC/TR 61641 Edition 2.0 2008-01, Enclosed low-voltage switchgear and controlgear assemblies – Guide for testing under conditions of arcing due to internal fault
کتاب Sleisenger and Fordtran's Gastrointestinal and Liver Disease زبان اصلی
2017
Now in its 10th edition, Sleisenger and Fordtran’s Gastrointestinal and Liver Disease remains your indispensable source for definitive, state-of-the-art answers on every aspect of gastroenterology and hepatology. Overcome your most complex clinical challenges and make optimal use of the newest techniques, technologies, and treatments—with superb guidance from hundreds of world-renowned authorities. Meticulous updates throughout include the latest approaches and improvements in gastrointestinal and liver disease diagnosis and therapy as well as hundreds of images and 35 new procedural videos.
"..one of the most valuable clinical resources in the dynamic field of gastroenterology and hepatology." Reviewed by Brindusa Diaconu on behalf of the Journal of Gastrointestinal and Liver Diseases, July 2015
"..an engaging, educational yet clinically orientated textbook which is relevant to modern clinical practice."Reviewed by Dr Harry Brown on behalf of glycosmedia.com, April 2015
"I can personally attest to the remarkable advances that have been made, as I was author of the chapter on eosinophilic gastroenteritis in the second edition of the textbook, and reading the same chapter in the tenth edition underscores the important advances that have been made in our understanding of the molecular basis as well as the pathophysiology of this and related disorders." Foreword by Norton J. Greenberger, MD Boston, Massachusetts, June 2015
حجم فایل: 16 مگابایت
کتاب Pediatric Radiotherapy Planning and Treatment زبان اصلی
By becoming knowledgeable about optimal treatment methods designed specifically for childhood cancers, members of a radiotherapy team can help improve both pediatric cancer survival statistics and patients’ quality of life. Pediatric Radiotherapy Planning and Treatment is the first single, focused resource available for health care providers to accurately plan and deliver radiation therapy to children.
The first section of the book discusses the statistics of pediatric cancer incidence and survival. It also reviews the literature on radiation-induced secondary malignancies, addressing the use of intensity-modulated radiation therapy (IMRT) in children.
The second section presents disease-specific chapters. Each chapter in this section gives a clinical overview of the disease, describes treatment planning and delivery concepts and guidance, and surveys late effects and organ tolerance doses. Many of the techniques presented can be readily translated to any radiotherapy department. The book also explores the historical background underpinning current treatment paradigms, which reveals the tremendous creativity of radiation oncologists and physicists in addressing difficult treatment dilemmas.
Medical physicists, dosimetrists, radiation oncologists, and others in a pediatric radiotherapy team must understand pediatric cancers and know how to accurately and safely implement optimal treatments to minimize late effects and maximize the chance for cure or palliation. The methods and clinical background in this book help these health care providers―even those with no formal training in pediatric radiotherapy―recognize the differences between pediatric cancers and adult cancers and then design and administer an appropriate treatment plan
حجم فایل: 34 مگابایت
Modeling the impacts of integrated small watershed management on soil erosion and sediment delivery: A case study in the Three Gorges Area, China
Journal of Hydrology, Volume 438, p. 156-167
Z.H. Shi a,b,⇑, L. Ai b, N.F. Fang b, H.D. Zhu b.
(c) 2012 Elsevier B.V.
SummarySoil erosion poses a serious problem for sustainable agriculture and the environment. Owing to long-term anthropic pressure including overuse and inappropriate development, soil erosion has become a serious issue in the Three Gorges Area (TGA), China. Recently, integrated small watershed management (ISWM) for soil conservation in the TGA was rapidly developed. This study was conducted to investigate the impact of ISWM on soil erosion and sediment delivery in the Wangjiaqiao watershed in the TGA. The WATEM/SEDEM distributed erosion and sediment transport model was used to evaluate the effectiveness of the ISWM project. The model was calibrated against long-term measured suspended sediments at the watershed outlet. Land use and conservation measures were mapped and analyzed for 1995 and 2005, paying particular attention to quantification of changes in soil erosion and sediment delivery due to ISWM. The results showed that a combination of decreased soil loss (from 18.5 t ha-1 y-1 in 1995 to 13.2 t ha-1 y-1 in 2005) and increased sediment deposition (from 7.7 to 12.4 t ha-1 y-1) has led to a strong decrease in sediment yield (from 8.4 to 3.9 t ha-1 y-1) and the sediment delivery ratio (from 0.454 to 0.295). The results of scenario analysis showed that soil conservation measures taken in fields effectively reduce on-site soil loss and sediment yield. However, off-site sediment control measures appear to be much less effective at reducing sediment yield. This diachronic comparison of soil erosion and sediment delivery revealed that ISWM is quite effective and efficient; therefore, it is the appropriate method to combat soil erosion in the TGA and similar areas.
چکیده:
فرسایش خاک یک مشکل جدی برای کشاورزی پایدار و محیط زیست است. فشار بیش از حد انسان بر روی این منابع از جمله استفاده بیش از حد و توسعه نامناسب، سبب شده است که فرسایش خاک به یک مشکل جدی در منطقه TGAچین تبدیل شود. به تازگی، مدیریت یکپارچه حوضههای کوچک (ISWM) برای حفاظت خاک در TGA به سرعت توسعه یافته است. این مطالعه به منظور بررسی اثرات ISWM بر فرسایش خاک و تحویل رسوب در حوضه Wangjiaqiaoدر منطقه TGA چین انجام شد.
مدل WATEM/SEDEM توزیع فرسایش و انتقال رسوب برای ارزیابی اثربخشی پروژه ISWM بکار برده شد. مدل برای رسوبات معلق اندازه گیری شده در دراز مدت در خروجی حوضه کالیبره شد. کاربری اراضی و اقدامات حفاظتی نقشهبرداری شد و برای سالهای 1995 و 2005 مورد تجزیه و تحلیل قرار گرفت تا تغییرات کمی و کیفی نرخ تحویل رسوب و فرسایش خاک
ترجمه بخش Markov Chains از کتاب
Probability, Statistics,
and Random Processes
for Electrical Engineering
Third Edition
Alberto Leon-Garcia
University of Toronto
قسمتی از متن در اینجا آورده شده است :
زنجیره های مارکوف
به طور کلی متغیرهای تصادفی که به صورت گروهی یک فرآیند تصادفی را تعریف می کنند نابسته نیستند و در حقیقت از نظر آماری می توانند به شیوه های بسیار پیچیده ای به هم وابسته باشند. در این فصل کلاسی از فرآیندهای تصادفی مارکوف که شکل ساده ای از وابستگی را دارند و در مدل سازی بسیاری از مسائل عملی کاربرد دارند معرفی می شود. ما روی فرآیندهای مارکوف با مقادیر صحیح تمرکز می کنیم که به آن ها سری مارکوف گفته می شود.
بخش 11.1 فرآیندهای مارکوف و حالت ویژه سری های مارکوف را معرفی می کند.
بخش 11.2 سری های مارکوف زمان گسسته را در نظر می گیرد و رفتار احتمالات حالت آن ها را روی زمان بررسی می کند.
بخش 11.3 روی ویژگی های ساختاری سری های مارکوف زمان گسسته که رفتار طولانی مدت شان را در نظر گرفته و احتمالات حالت را محدود می کند، بحث می کند.
بخش 11.4 سری های مارکوف زمان پیوسته را معرفی کرده و حالت گذرا را مانند رفتار طولانی مدت احتمالات حالت در نظر می گیرد.
بخش 11.5 در مورد سری های مارکوف معکوس از نظر زمان صحبت کرده و روی ویژگی های جالب توجه سری های مارکوف معکوس پذیر که در حالت پیش رو و عقب رو در زمان یکسان هستند، کار می کند.
سرانجام بخش 11.6 روش هایی برای شبیه سازی سری های مارکوف زمان گسسته و زمان پیوسته معرفی می کند.
فرآیند تصادفی X(t) یک فرآیند مارکوف است اگر آینده فرآیند که داده شده است به گذشته ی آن وابسته نباشد
41 صفحه
فایل ورد - قابل ویرایش بدون تبلیغ