نتایج جستجو برای: geobotanical method
تعداد نتایج: 1630169 فیلتر نتایج به سال:
magnetic resonance imaging (mri) is a notable medical imaging technique that makes of phenomenon of nuclear magnetic resonance. because of the resolution and the technology being harmless, mri has considered as the most desirable imaging technique in clinical applications. the visual quality of mri plays an important role in accuracy of medical delineations that can be seriously degraded by exi...
Abstract The article presents data from the study of vegetation dynamics in Chornobyl Exclusion Zone 30 years after nuclear disaster and resettlement its local people. 1993 prognostic on further development grass forest community groups this area was only partially correct. new prognosis for demutation successions reflects deviations linear with a possible horizontal "shift", depending climatic...
During the conference, dedicated to 100th anniversary of Department Geobotany, exhibition “Development vegetation mapping in Russia” was organized at Komarov Botanical Institute RAS. The aim show consistent development theoretical approaches compilation legends, techniques and methods, various schools Russia. About 70 maps different times, from 1900 present, were demonstrated. Brief explanatory...
Subarctic palsa mires undergo substantial transformation under climate impacts, and today a reliable marker of their degradation is the vegetation cover. We studied correspondence between surface traits degradation, as expressed in composition, interior condition permafrost within subarctic central part Kola Peninsula. have employed set methods to collect data, including geobotanical relevés, u...
Goal. To reveal the main milestones of life and creative path, to summarize most important scientific achievements talented agricultural scientist, one organizers higher branch education research in Ukrainian SSR D.G. Vilenskyi. Methods. General — analysis, synthesis, classification; historical problem-chronological, comparative-historical, retrospective, biographical. Results. It is proved tha...
An analysis of the landscape spatial structure and diversity in mountain ranges Northeast Siberia is essential to assess how tundra boreal landscapes may respond climate change anthropogenic impacts vast mountainous permafrost Arctic regions. In addition, a precise map required for knowledge-based territorial planning management. this article, we aimed explore enhanced methods analyse Orulgan R...
The south of the Non-Chernozem Region is north-ern boundary sugar beet production in Russian Fed-eration. An important factor restraining growth crop productivity high weed infestation crops. To devel-op an effective system protection against weeds, it necessary to study their species composition order determine most occurring and noxious species. available data geobotanical surveys since 1930s...
Motivation The goal of the Russian Arctic Vegetation Archive (AVA-RU) is to unite and harmonize data plot-based plant species their abundance, vegetation structure environmental variables from Arctic. This database can be used assess status as a baseline document biodiversity changes in future. archive for scientific studies well inform nature protection restoration efforts. Main types containe...
روشهای پانلی (panel method) از بین سایر روشهای محاسبه خصوصیات جریان سیال حول یک جسم، روشهای سریع، کارآمد و مناسبی هستندبر مبنای این روشها، نرم افزارهای متعددی نوشته شده اند که از میان آنها می توان به cmarc ، quadpan ، vsaero ، usaero و ... اشاره کرد. آنچه که در این تحقیق می آید محاسبه ضرایب آیرودینامیکی هواپیمای چهارنفره و تمام کامپوزیت فجر- 3 به کمک نرم افزار cmarc می باشد. پاسخهای به دست آمده...
در این تحقیق ابتدا با توجه به ویژگی های پدیده ی برخورد با سرعت بالا که عبارتند از تغییر شکل های بزرگ که منجر به یک مسئله ی غیر خطی هندسی و مادی میشود ، سطوح مادی در حال حرکت و سطوح آزاد ، مرزهای تغییر شکل پذیر و سیستم گسسته بر پایه ی قوانین محیط پیوسته، روشsph از میان روش های عددی انتخاب گردیده، سپس نحوه ی تخمین زدن متغیر میدان در این روش، روند فرمول نویسی sph و همچنین جایگاه این روش در میان رو...
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