نتایج جستجو برای: largest patch index lpi to assess road impacts

تعداد نتایج: 10755420  

Journal: :جنگل و فرآورده های چوب 0
آزاده دلجویی کارشناس ارشد مهندسی جنگل دانشکدة منابع طبیعی دانشگاه تهران، کرج، ایران احسان عبدی دانشیار گروه جنگلداری و اقتصاد جنگل دانشکدة منابع طبیعی دانشگاه تهران، کرج، ایران باریس مجنونیان استاد گروه جنگلداری و اقتصاد جنگل دانشکدة منابع طبیعی دانشگاه تهران، کرج، ایران

forest roads are directions in natural habitats that used to transport wood products, secondary forest products and recreation. constructing forest roads causes trees clearing with specified width thus lead to direct or indirect changes in forest ecosystems and forest environment. this study aims to assess the changes of diversity and richness indices in main and secondary forest roads in a par...

Journal: :Journal of environmental quality 2011
Q L Yan J J Zhu Z B Hu O J Sun

Assessing environmental effects of shelter forests is primarily necessary for realizing their greatest protective benefits. The Three-North Shelter Forest Program (TNSFP), the largest ecological afforestation program in the world, has been operated for three decades in China but so far lacks comprehensive assessment of its environmental impacts. Horqin Sandy Land (HSL) in Northeast China is one...

Journal: :Science innovation, 2022

The outbreak of COVID-19 has brought huge impact on Chinese economy and society, including the development country’s logistics industry. This paper focuses analyzing whether China Logistics Prosperity Index (LPI) a relationship with cases cumulative vaccination rate respectively. Correlation tests are conducted in IBM SPSS Statistics 23 to analyze between monthly new LPI, additional doses per 1...

Journal: :فیزیک زمین و فضا 0
مریم قرایلو استادیار، گروه فیزیک فضا، مؤسسۀ ژئوفیزیک دانشگاه تهران، ایران سمانه ثابت قدم استادیار، گروه فیزیک فضا، مؤسسۀ ژئوفیزیک دانشگاه تهران، ایران سرمد قادر دانشیار، گروه فیزیک فضا، مؤسسۀ ژئوفیزیک دانشگاه تهران، ایران

lightning is a characteristic of severe weather and often associated with hail and heavy rainfall. it is a natural hazard with potential threat to human life and considerable damages to aviation structures. therefore, lightning prediction is critical and the real-time lightning detection systems are able to determine the location of cloud-to-ground (cg) lightning strikes accurately.generally ma...

2004
TODD J. HAWBAKER VOLKER C. RADELOFF

Roads are important components of landscapes; they fragment habitat, facilitate invasive species spread, alter hydrology, and influence patterns of land use. Previous research on the ecological impacts of roads may have underestimated their effect because currently available sources of road data do not include the full road network. We compared differences in road density and landscape pattern ...

2015

This study characterizes the leachates quality of an active dumpsite in Warri, Delta State and also analyses its contamination or pollution potential. Leachate Pollution Index (LPI) a tool for quantifying pollution potential of leachates generated from dumpsites has been used to quantify the leachates contamination potential of the dumpsite. The LPI values for the different sample locations L1,...

Journal: : 2022

Introduction. In modern conditions, characterized by further reorientation of foreign trade relations in the direction integration national economy into European environment, issue assessing effectiveness logistics management at enterprise level and Ukraine as a whole is becoming increasingly important. The world economy, development transport networks market services, deepening international d...

پایان نامه :وزارت علوم، تحقیقات و فناوری - دانشگاه صنعتی (نوشیروانی) بابل - دانشکده مهندسی مکانیک 1389

due to the limiting workspace of parallel manipulator and regarding to finding the trajectory planning of singularity free at workspace is difficult, so finding a best solution that can develop a technique to determine the singularity-free zones in the workspace of parallel manipulators is highly important. in this thesis a simple and new technique are presented to determine the maximal singula...

پایان نامه :وزارت علوم، تحقیقات و فناوری - دانشگاه فردوسی مشهد - دانشکده ادبیات و علوم انسانی دکتر علی شریعتی 1387

this study was designed to investigate the impacts of teachers self-disclosure on students foreign language classroom anxiety, attitude to english language learning and their achievement scores at the end of the term. there were 48 female learners of intermediate level. they were not randomly selected. there were one experimental group with 21 students and one control group with 27 students.the...

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