نتایج جستجو برای: low salinity polymer injection

تعداد نتایج: 1441862  

Journal: :Carbohydrate polymers 2017
Bhairavi Doshi Eveliina Repo Juha P Heiskanen Juho Antti Sirviö Mika Sillanpää

Oil spills are the significant sources of hydrocarbons entering in the receiving aquatic environment. An efficient method to remove hydrocarbons from water resources is adsorption. In this study, water soluble N,O-carboxymethyl chitosan (NO-CS) was synthesized by carboxymethylation of chitosan in a hydro-alcoholic medium at 50°C by chloroacetic acid. The polymer was characterized through degree...

Journal: :Journal of Petroleum Exploration and Production Technology 2020

2017
Caili Dai Zhongliang Xu Yining Wu Chenwei Zou Xuepeng Wu Tao Wang Xu Guo

Water-soluble polymers are widely used in oilfields. The rheological behaviors of these polymers in high-salinity solution are very important for stimulation of high-salinity reservoirs. In this work, a novel thermal-resistant and shear-stable amphoteric polyacrylamide (PASD), prepared from acrylamide (AM), sodium styrene sulfonate (SSS), and acryloxyethyl trimethylammonium chloride (DAC) monom...

Journal: :International Journal of Integrated Engineering 2021

Lately, natural fibers have been gaining consideration in development of composites due to its biodegradability, availability and low-cost compared synthetic fibers. Natural are renewable sources, biodegradable, environmentally friendly effortless machinery. In this paper, the manufacturing production for fiber reinforced polymer composite (NFRC) will be reviewed. These including injection mold...

Journal: :iranian journal of radiation research 0
m. gholami department of medical physics and medical engineering, school of medicine, isfahan university of medical sciences, isfahan, iran d. shahbazi-gahrouei department of medical physics and medical engineering, school of medicine, isfahan university of medical sciences, isfahan, iran t. allahverdi pourfallah department of biophysics and biochemistry, school of medicine, mazandaran university of medical sciences, sari, iran

background: the human body contains of different tissues and cavities with different physical and radiological properties. most important among these are tissues and cavities that are radiologically different from water, including lungs, sinuses and bones. gel dosimetry provides a unique feature to display dose distributions occurring in clinical radiation therapy in three dimensions. materials...

Journal: :Genetics and molecular research : GMR 2014
X N Bao C K Mu C Zhang Y F Wang W W Song R H Li C L Wang

Challenged by the low salinity, 4 parts per thousand (4 ppt), for 72h, the survivals of swimming crabs (Portunus trituberculatus) were collected as the screened group (SG, tolerant to low salinity). Aiming at identifying the mechanism of low salinity tolerance, quantitative real-time PCR was employed to investigate the expression profiles of 4 HSP genes (HSP60, HSP70, HSP90-1, HSP90-2) in the h...

2004
M. A. Uijttewaal G. A. de Wijs R. A. de Groot

Polymer diodes require cathodes that do not corrode the polymer but do have low work function to minimize the electron injection barrier. First-principles calculations demonstrate that the work function of the (1000) surface of the compound Ca 2 N is half an eV lower than that of the elemental metal Ca (2.35 vs. 2.87 eV). Moreover its reactivity is expected to be smaller. This makes Ca 2 N an i...

2014
Raul A Guerrero Alberto R Piola Harold Fenco Ricardo P Matano Vincent Combes Yi Chao Corinne James Elbio D Palma Martin Saraceno P Ted Strub

Satellite-derived sea surface salinity (SSS) data from Aquarius and SMOS are used to study the shelf-open ocean exchanges in the western South Atlantic near 35°S. Away from the tropics, these exchanges cause the largest SSS variability throughout the South Atlantic. The data reveal a well-defined seasonal pattern of SSS during the analyzed period and of the location of the export of low-salinit...

Journal: :Physiological and biochemical zoology : PBZ 2003
Carol Eunmi Lee Christine H Petersen

Invasive species are commonly thought to have broad tolerances that enable them to colonize new habitats, but this assumption has rarely been tested. In particular, the relative importance of acclimation (plasticity) and adaptation for invasion success are poorly understood. This study examined effects of short-term and developmental acclimation on adult salinity tolerance in the copepod Euryte...

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