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51.
Jelassi Raja Khemaissia Hajer Ghemari Chedliya Raimond Maryline Souty-Grosset Catherine Nasri-Ammar Karima 《Environmental science and pollution research international》2019,26(6):5577-5587
Environmental Science and Pollution Research - This study deals with the evaluation of trace element bioaccumulation and histological alterations in the hepatopancreas of the supralittoral amphipod... 相似文献
52.
T. Udayakumar K. Raja A. Tanksale Abhijit P. Sathiya 《Journal of Manufacturing Processes》2013,15(4):558-571
Friction welding is one of the most economical and highly practicable methods in joining similar and dissimilar metals. In this study, high-quality welds are produced in the super duplex stainless steel by continuous drive friction welding successfully. Design of experiment was done using central composite design of response surface methodology. In the present work, the microstructure and mechanical properties of friction welded super duplex stainless steel (UNS S32760) were examined. The base material has a microstructure consisting of the ferrite matrix with austenite islands. Ferrite content was analyzed through the phase analyzer software and found that it is in the range of 42–55% in all weld metals. The phases were further analyzed through X-ray diffraction method. All the weld metals have higher hardness than the base metals. Weld transverse tensile failures consistently occurred away from the weld zone and exhibit more hardness, yield and ultimate tensile strengths than the base material. The austenite content increases with nitrogen concentration. Nitrogen could enhance the yield stress and ultimately tensile strength of super duplex stainless steel. Secondary phase precipitation is not observed in the welded joint probably due to the shorter heating times. 相似文献
53.
Suresh Raja 《Journal of the Air & Waste Management Association (1995)》2013,63(12):1550-1559
Abstract Uptake of aromatic hydrocarbon vapors (benzene and phenanthrene) by typical micrometer-sized fog-water droplets was studied using a falling droplet reactor at temperatures between 296 and 316 K. Uptake of phenan-threne vapor greater than that predicted by bulk (air-water)-phase equilibrium was observed for diameters less than 200 μm, and this was attributed to surface adsorption. The experimental values of the droplet-vapor partition constant were used to obtain the overall mass transfer coefficient and the mass accommodation coefficient for both benzene and phenanthrene. Mass transfer of phenanthrene was dependent only on gas-phase diffusion and mass accommodation at the interface. However, for benzene, the mass transfer was limited by liquid-phase diffusion and mass accommodation. A large value of the mass accommodation coefficient, α = (1.4 ± 0.4) × 10?2 was observed for the highly surface-active (hydrophobic) phenanthrene, whereas a small α = (9.7 ± 1.8) × 10?5 was observed for the less hydrophobic benzene. Critical cluster numbers ranging from 2 for benzene to 5.7 for phenanthrene were deduced using the critical cluster nucleation theory for mass accommodation. The enthalpy of mass accommodation was more negative for phenanthrene than it was for benzene. Consequently, the temperature effect was more pronounced for phenanthrene. A linear correlation was observed for the enthalpy of accommodation with the excess enthalpy of solution. A natural organic carbon surrogate (Suwannee Fulvic acid) in the water droplet increased the uptake for phenanthrene and benzene, the effect being more marked for phenanthrene. A characteristic time constant analysis showed that uptake and droplet scavenging would compete for the fog deposition of phenanthrene, whereas deposition would be unimpeded by the uptake rate for benzene vapor. For both compounds, the characteristic atmospheric reaction times were much larger and would not impact fog deposition. 相似文献
54.
Veerasingam S Venkatachalapathy R Raja P Sudhakar S Rajeswari V Asanulla RM Mohan R Sutharsan P 《Environmental science and pollution research international》2011,18(4):687-693
Background, aim, and scope
The aim of the present study was to evaluate the distribution of petroleum hydrocarbons in ten commercial fish species and water samples in three estuaries along Tamilnadu coast, Bay of Bengal, India. 相似文献55.
Kanniah Paulkumar Balakrishnan Subburathinam Subramanian Elaiya Raja Sudalaimani Dinesh Kumar Radhamani Jila Sivasubramaniam Sudhakar 《Environmental science and pollution research international》2023,30(10):25239-25255
Environmental Science and Pollution Research - Recently, the production of silver nanoparticles and their commercial products has generated increased concern and caused a hazardous impact on the... 相似文献
56.
The sorption behaviour of alpha- and beta-endosulfan in soil organic matter was investigated using standard soil humic acid (HA) and soil fulvic acid (FA) with a modified solubility enhancement method and a dialysis bag technique. For HA, all the experiments were conducted at an ionic strength of 0.001 mol/L, in both the presence and absence of calcium and at an ionic strength of 0.01 mol/L. For FA, the experiments were conducted at two ionic strengths: 0.001 mol/L (with calcium) and 0.01 mol/L. This study is the first to describe the striking differences in the sorption behaviours of the two stereoisomers of endosulfan in HA and in FA. The sorption coefficients of alpha-endosulfan in HA and FA were significantly higher than those of beta-endosulfan. Beta-endosulfan has comparable sorption coefficients (1.5–5.4 L/g) in HA and in FA. Ionic strength and the presence of calcium have no significant effect on the sorption of beta-endosulfan in HA. However, calcium can significantly (p=0.01) enhance the solubility of alpha-endosulfan in HA. Changes in ionic strength by one order of magnitude also affect the solubility of alpha-endosulfan in HA. The sorption coefficients of alpha-endosulfan in HA (10–36 L/g) were greater than those in FA (9–14 L/g). The chirality of the alpha-isomer was hypothesised to be the primary reason behind its higher sorption in soil organic matter relative to the beta-isomer. In the presence of dissolved HA and FA found in natural soil environments, solubility of endosulfan can be increased by five times than the aqueous solubility of endosulfan without HA and FA. 相似文献
57.
The aim of present study was to validate hepatoprotective and antioxidant activities of the bark of Bridelia retusa. The aqueous ethanol extract of B. retusa exhibited highest in vitro hepatoprotective effects as evident from the significantly reduced serum glutamate oxaloacetate transaminase (SGOT) and serum glutamate pyruvate transaminase (SGPT) into the incubation medium of rat hepatocytes with carbon tetrachloride (CCl4), over the other organic extracts (chloroform, ethylacetate, and methanol). CCl4 administered through subcutaneous injection produced a marked elevation in the serum levels of GOT, GPT, lactate dehydrogenase, alkaline phosphatase, bilirubin, thiobarbituric acid reactive substances, and decreased in the levels of reduced glutathione, superoxide dismutase, catalase, glutathione-S-transferase, glutathione reductase, glutathione peroxidase, and total protein content. The biochemical activities were normalized in the pretreatment of rats induced by CCl4 with different doses (250 and 500 mg kg?1) of the aqueous ethanol extract of B. retusa. Histopathological changes induced by CCl4 were also significantly attenuated by aqueous ethanol extract of B. retusa treatment. The activity of the aqueous ethanol extract of B. retusa at the dose of 500 mg kg?1 was comparable to the standard drug, silymarin (25 mg kg?1). The overall data indicated that B. retusa possesses a potent protective effect against CCl4-induced hepatic damage and oxidative stress. 相似文献
58.
Chinnasamy Rajaram Prakash Theivendran Panneerselvam Sundararajan Raja 《毒物与环境化学》2013,95(8):1397-1407
In the present study, a series of novel Schiff bases of isatin were synthesized by condensation of imesatin with different aromatic aldehydes. The imesatins were synthesized by reaction of isatin with p-phenylenediamine. The chemical structures of the synthesized compounds were confirmed by means of IR, 1H-NMR, 13C-NMR, mass spectroscopy, and elemental analysis. These compounds were screened for antioxidant activity by DPPH, nitric oxide and hydrogen peroxide radical scavenging activity. In all the methods, the compound 3-(4-(3,4,5-trimethoxy benzylideneamino)phenylimino) indoline-2-one (5d) showed highest antioxidant activity because of the presence of electron donating groups and the compound 3-(4-(4-nitrobenzylideneamino)phenylimino) indoline-2-one (5f) showed the least activity because of the presence of an electron withdrawing group. 相似文献
59.
Khan Faizal Krishnaraj Srinivasamoorthy Raja Prakash Selvaraj Gopinath Cheelil Rabina 《Environmental science and pollution research international》2021,28(15):18567-18588
Environmental Science and Pollution Research - The present study area falls beside the coastal zone of Tamil Nadu, and Puducherry is characterized by varied geological formations that mostly... 相似文献
60.
Muthusamy Parimala Devi Velusamy Gowrishankar Thandavan Sathya Govindasamy Boopathi Raja Savarimuthu Nithya 《Environmental science and pollution research international》2022,29(24):35542-35556
Environmental Science and Pollution Research - Nowadays, modern industries generate their energy by using renewable solar. The rapid increase in photovoltaic (PV) module installations provides a... 相似文献