نتایج جستجو برای: manmade source

تعداد نتایج: 419529  

Journal: :Journal of Marine Science and Engineering 2023

The decommissioning of manmade structures in the marine environment causes large volumes greenhouse gas (GHG) emissions to be released. Current GHG calculation methods for offshore oil and industry infrastructure leave sources unaccounted for. results presented here show that these consequential are underreported by 50%. Until now, no study has looked at cumulative impact decommissioning, but t...

Journal: :Advances in Space Research 2022

The Polarimetric Synthetic Aperture Radar (PolSAR) systems use electromagnetic radiations of different polarizations in the microwave frequency to collect scattering information from targets on Earth. Nevertheless, as with any other electronic device, PolSAR are also not ideal and subjected distortions. most important these distortions polarimetric caused due channel imbalance, phase bias, cros...

پایان نامه :0 1374

the research questions were as follows: 1. is there any relationship between the students concious awareness of the form and implications of the conjuncations and their improvement in using appropriate conjunctions? 2. does students knowledge of the from and the implications of the conjunctions help them to produce more coherent writings. 3. does a comparison between english conjunctions and th...

پایان نامه :وزارت علوم، تحقیقات و فناوری - دانشگاه تربیت مدرس 1389

growing demands and requires of high data rate systems cause significant increase of high frequency systems for wideband communication applications. as mixers are one of the main blocks of each receivers and its performance has great impact on receiver’s performance; in this thesis, a new solution for ku-band (12-18 ghz) mixer design in tsmc 0.18 µm is presented. this mixer has high linearity a...

2008
Takatoshi Hattori

The International Commission on Radiological Protection (ICRP) released drafts of new recommendations in June 2004, June 2006 and January 2007 and finally approved a new set of fundamental recommendations on the protection of humans and the environment from ionizing radiation at its meeting in Essen, Germany, 19-21 March 2007. In the process of the completion of the draft recommendations, the n...

2015
Ewa Cukrowska Julien Lusilao-Makiese Hlanganani Tutu Luke Chimuka

Wetlands are essential habitats in the environment since they fulfill a variety of ecological functions and support rich biodiversity. One major characteristic of wetlands is their ability to act as chemical sinks. There have been biogeochemical models developed for wetlands in Europe and North America but these systems differ from those found in South Africa, where most wetlands are riverfed a...

Journal: :journal of sciences, islamic republic of iran 2015
a. aramvash s. dashti aghjeh

polyhydroxyalkanoates (phas) are bioplastics derived from renewable resources such as vegetable oils, corn starch, or microbes. the polyhydroxybutyrate (phb) is a short-chain-length pha, and the most important bioplastic produced by certain microorganisms in the presence of excess carbon sources. in this study batch cultivation of alcaligenes eutrophus with the aim of increasing phb production ...

2017
Giovanna Mollo Piers L Cornelissen Rebecca E Millman Andrew W Ellis Elizabeth Jefferies

The "hub and spoke model" of semantic representation suggests that the multimodal features of objects are drawn together by an anterior temporal lobe (ATL) "hub", while modality-specific "spokes" capture perceptual/action features. However, relatively little is known about how these components are recruited through time to support object identification. We used magnetoencephalography to measure...

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