نتایج جستجو برای: atmospheric divergence

تعداد نتایج: 124279  

The Moldavian dragonhead (Dracocephalum moldavica L., Lamiaceae) is an annual medicinal plant with beneficial nutritional sources that plays important roles in human and animal feed. Nanoparticles and cold atmospheric plasma increase biochemical compounds in plants. In this study, the effects of copper nanoparticles and cold atmospheric plasma on biochemical indices of the medicinal plant Draco...

Chunming Zhang, Yi Chai, Zhengjun Zhang,

Variable selection via penalized estimation is appealing for dimension reduction. For penalized linear regression, Efron, et al. (2004) introduced the LARS algorithm. Recently, the coordinate descent (CD) algorithm was developed by Friedman, et al. (2007) for penalized linear regression and penalized logistic regression and was shown to gain computational superiority. This paper explores...

Observation in absolute darkness and daytime under every atmospheric situation is one of the advantages of thermal imaging systems. In spite of increasing trend of using these systems, there are still lots of difficulties in analysing thermal images due to the variable features of pedestrians and atmospheric situations. In this paper an efficient method is proposed for detecting pedestrians in ...

Journal: :پژوهش های علوم و فناوری چوب و جنگل 0

in order to capability investigation on landsat-7 satellite etm+ data in separability forest type and mapping in the zagros region, a small window digital data dating july 2001 from ghalajeh forests in the kermanshah province were analyzed. ground data were provided the cluster sampling method and with 0.36 ha. no radiometric error was found then the quality investigations. orthorectification w...

Journal: :physical chemistry research 2016
morteza vahedpour

the reaction of ch₃nh₂ with o₂ on the singlet potential energy surfaces (pes) was carried out using the b3lyp, ccsd(t) and g3b3 theoretical approaches along with 6-311++g(3df,3pd) basis set. the suggested mechanism for the title reaction consists of one pre-reactive complex. from the pre-reactive complex, nine types of products, ch2nh+h2o2, ch3nh+ooh, nh2cho+h2o, ch2nho+h2o, nh3+hcooh, ch2nh+h2...

2014
Juliane Euler Tobias Ritter Stefan Ulbrich Oskar von Stryk

Optimal coordination of multiple sensors is crucial for efficient atmospheric dispersion estimation. The proposed approach adaptively provides optimized trajectories with respect to sensor cooperation and uncertainty reduction of the process estimate. To avoid the timeconsuming solution of a complex optimal control problem, estimation and vehicle control are considered separate problems linked ...

Journal: :جغرافیا و توسعه ناحیه ای 0
رامشت رامشت شاه زیدی شاه زیدی

the alluvial fan of shahdaad in derakhtangaan river is one of the biggest alluvial fans in a dry area in northeastern kerman. this alluvial fan has been formed due to different material erosions in the drainage basin of derakhtangaan river and lying of these materials in the extreme part of this basin called dasht-e-lut (the plain of lut). the region which has been studied in this research is o...

Compressible gas flow inside a convergent-divergent nozzle and its exhaust plume atdifferent nozzle pressure ratios (NPR) have been numerically studied with severalturbulence models. The numerical results reveal that, the SST k–ω model give the bestresults compared with other models in time and accuracy. The effect of changes in value ofdivergence half-angle (ε ) on the nozzle performance, thru...

Journal: :فیزیک زمین و فضا 0
محمد جغتایی دانشجوی دکتری هواشناسی، گروه فیزیک فضا، موسسه ژئوفیزیک دانشگاه تهران، ایران علیرضا محب الحجه دانشیار، گروه فیزیک فضا، موسسه ژئوفیزیک دانشگاه تهران، ایران

the development of the dynamical core of a potential-vorticity-based atmospheric general circulation model is explored. there are some advantages of using potential vorticity (pv) as a prognostic variable in that the resulting model can give more accurate simulation of the evolution of pv, as arguably the most fundamental dynamical quantity. further, there is possibility of explicit representat...

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