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Charnockites and charnockites

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Geoscience Frontiers 2012年第6期3卷 737-744页

作者： h.m.rajesh m.Santosh Department of Geology University of JohannesburgAuckland Park Kingsway Campus School of the Earth Sciences and Resources China University of Geosciences(Beijing)

1. Introduction The continental crust, covering nearly a third of the Earth＇s surface, is dominantly made up of granites and granodiorites （Rudnick and Gao, 2003）. Although the vast majority of these granitoids are amphibole- and/or biotite-bearing, orthopyroxene-bearing granitoids form a minor but important component of the lower continental crust in many high-grade terrains （e.g., Bohlender et al., 1992; Kilpatrick and Ellis, 1992; Sheraton et al., 1992; Berger et al., 1995; Zhou et al.,

关键词： Charnockites and charnockites

Experimental and petrological constraints on local-scale interaction of biotite-amphibole gneiss with h_2O-CO_2-(K,Na) Cl fluids at middle-crustal conditions:Example from the Limpopo Complex,South Africa

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Geoscience Frontiers 2012年第6期3卷 829-841页

作者： Oleg G.Safonov Elizaveta I.Kovaleva Svetlana A.Kosova h.m.rajesh Georgy A.Belyanin maria A.Golunova Dirk D.Van Reenen Institute of Experimental mineralogy RAS ChernogolovkaMoscow Region 142432.Russia Department of Petrology.moscow State University Moscow 119899Russia Department of Geology University of JohannesburgP.O.Box 524Auckland Park 2006JohannesburgSouth Africa Labor fur Geochronologie Department fur LithospharenforschungUniversitat WienAlthanstrasse 14A-1090 ViennaAustria Institute of Experimental mineralogy RAS ChernogolovkaMoscow Region 142432Russia Department of Geology University of JohannesburgP.O.Box 524Auckland Park 2006Johannesburg.South Africa

Reaction textures and fluid inclusions in the -2.0 Ga pyroxene-bearing dehydration zones within the Sand River biotite-hornblende orthogneisses （Central Zone of the Limpopo Complex） suggest that the formation of these zones is a result of close interplay between dehydration process along ductile shear zones triggered by h2O-CO2-salt fluids at 750--800 ℃ and 5.5--6.2 kbar, partial melting, and later exsolution of residual brine and h2O-CO2 fluids during melt crystallization at 650--700 ℃. These processes caused local variations of water and alkali activity in the fluids, resulting in various mineral assemblages within the dehydration zone. The petrological observations are substantiated by experiments on the interaction of the Sand River gneiss with the h2O-CO2-（K, Na）Cl fluids at 750 and 800 ℃ and 5.5 kbar. It follows that the interaction of biotite-amphibole gneiss with h2O-CO2-（K, Na）CI fluids is accompanied by partial melting at 750--800 ℃. Orthopyroxene-bearing assemblages are characteristic for temperature 800 ℃ and are stable in equilibrium with fluids with low salt concentrations, while salt-rich fluids produce clinopyroxene-bearing assemblages. These observations are in good agreement with the petrological data on the dehydration zones within the Sand River olthogneisses.

关键词： Charnockite Fluid-rock interaction CO2-rich fluids NaCl-KCl brines Partial melting Experimental petrology

Physics design of 14 meV neutron generator facility at the Institute for Plasma Research

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Plasma Science and Technology 2023年第12期25卷 115-121页

作者： h L SWAmI S VALA m RAJPUT m ABhANGI Ratnesh KUmAR A SAXENA rajesh KUmAR Institute for Plasma Research Gandhinagar 382428India homi Bhabha National Institute Training School ComplexMumbai 400094India

A high energy and high yield neutron source is a prime requirement for technological studies related to fusion reactor development. It provides a high-energy neutron environment for small-scale fusion reactor components research and testing such as tritium breeding, shielding, plasmafacing materials, reaction cross-section data study for fusion materials, etc. Along with ITER participation, the Institute of Plasma Research, India is developing an accelerator-based 14 meV neutron source with a yield of 10^(12)n s^(-1). The design of the source is based on the deuterium–tritium fusion reaction. The deuterium beam is accelerated and delivered to the tritium target to generate 14 meV neutrons. The deuterium beam energy and tritium availability in the tritium target are the base parameters of the accelerator-based neutron source design. The paper gives the physics design of the neutron generator facility of the Institute for Plasma Research. It covers the requirements, design basis, and physics parameters of the neutron generator. As per the analytical results generator can produce more than 1 × 10^(12)n s^(-1)with a 110 keV D^(+) ion beam of 10 mA and a minimum 5 Ci tritium target. however, the detailed simulation with the more realistic conditions of deuteron ion interaction with the tritium titanium target shows that the desired results cannot be achieved with 110 keV. The safe limit of the ion energy should be 300 keV as per the simulation. At 300 keV ion energy and 20 mA current, it reaches 1.6 × 10^(12)n s^(-1). moreover, it was found that to ensure sufficiently long operation time a tritium target of more than 20 Ci should be used. The scope of the neutron source is not limited to the fusion reactor research studies, it is extended to other areas such as medical radioisotopes research, semiconductor devices irradiations, and many more.

关键词： neutron generator neutronics accelerator physics design nuclear fusion

Antiviral,immunomodulatory,and anticoagulant effects of quercetin and its derivatives:Potential role in prevention and management of COVID-19

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Journal of Pharmaceutical Analysis 2022年第1期12卷 29-34页

作者： Souparnika h.manjunath rajesh K.Thimmulappa Department of Biochemistry Jagadguru Sri Shivarathreeshwara Medical CollegeJagadguru Sri Shivarathreeshwara Academy of Higher Education&Research(JSSAHER)Mysore570015India

The coronavirus disease 2019(COVID-19)pandemic caused by severe acute respiratory syndrome coronavirus 2(SARS-CoV-2)infection has caused a devastating health crisis *** this review,we have discussed that prophylactic phytochemical quercetin supplementation in the form of foods or nutraceuticals may help manage the COVID-19 *** following evidence supports our ***,nuclear factor erythroid-derived 2-like 2(NRF2)agonists abrogate replication of SARS-CoV-2 in lung cells,and quercetin is a potent NRF2 ***,quercetin exerts antiviral activity against several zoonotic coronaviruses,including SARS-CoV-2,mainly by inhibiting the entry of virions into host ***,inflammatory pathways activated by nuclear factor kappa B,inflammasome,and interleukin-6 signals elicit cytokine release syndrome that promotes acute respiratory distress syndrome in patients with COVID-19,and quercetin inhibits these pro-inflammatory ***,patients with COVID-19 develop thrombosis,and quercetin mitigates coagulation abnormalities by inhibiting plasma protein disulfide *** review provides a strong rationale for testing quercetin for the management of COVID-19.

关键词： COVID-19 Quercetin Immunomodulation Cytokine response syndrome NRF2 Antiviral

Intermediate Energy Coulomb Excitation of Neutron-Rich Nuclei

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Chinese Physics Letters 2010年第3期27卷 104-107页

作者： Rajiv Kumar rajesh Kharab h. C. Sharma Department of Applied Sciences Haryana College of Technology and Management Kaithal-136027 India Department of Physics Kurukshetra University Kurukshetra-136119 India

We reinvestigate the collective effects of the retardation as well as the bending on the Coulomb excitation cross sections and also on the B（E2） strengths of some neutron-rich isotopes using the intermediate energy Coulomb excitation theory. It is found that the B（E2） strengths extracted from the experimental Coulomb excitation cross section data get suppressed approximately by 6%. Furthermore, the obtained B（E2） strengths in the energy range 30-100 meV/A are found to be in better agreement with the corresponding values known from other sources, than those obtained by using the recoil-corrected relativistic Coulomb excitation theory.

关键词： Nuclear physics

Effects of a novel isoflavonoid from the stem bark of Alstonia scholaris against fructose-induced experimental cataract

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Journal of Integrative medicine 2019年第5期17卷 374-382页

作者： Pranay Soni rajesh Choudhary Surendra h.Bodakhe Department of Pharmacology Institute of Pharmaceutical SciencesGuru Ghasidas Vishwavidyalaya

Objective: The present study investigated the anticataract activity of a novel isoflavonoid, isolated from stem bark of Alstonia scholaris, against fructose-induced experimental ***: The bioactivity of fractions extracted from A. scholaris, an isolated isoflavonoid(ASII) was screened using in vitro(goat lens) and in vivo(albino rats) experimental cataract models. For the in vivo evaluation, albino rats(12–15 weeks old) were divided into five groups(n = 6). Group I(normal)received 0.3% carboxymethyl cellulose solution(10 m L/[kgád], p.o.). Group II(control) received 10%(w/v)fructose solution in their drinking water. Groups III–V received ASII at three different doses, 0.1, 1.0 and10 mg/(kgád), concurrently with 10%(w/v) fructose solution. Treatment was given daily for 8 consecutive weeks. During the protocol, systolic blood pressure, diastolic blood pressure, blood glucose level and lenticular opacity were monitored at 2-week intervals. Pathophysiological markers(catalase, superoxide dismutase, glutathione peroxidase, reduced glutathione and malondialdehyde) in eye lenses were examined at the end of the 8-week treatment ***: The results of in vitro study showed that A. scholaris extract and the active fraction(A3) reduced the lenticular opacity as compared to toxic control group. The in vivo study showed that 8-week administration of ASII(0.1, 1.0 and 10 mg/[kgád], p.o.) led to significant reduction in blood pressure and blood glucose level and retarded the initiation and evolution of cataractogenesis, compared to the fructoseinduced cataract model control. Additionally, ASII treatment led to significant improvement in lens antioxidants(catalase, superoxide dismutase, glutathione peroxidase and reduced glutathione) and decreased lens malondialdehyde, compared to the control group(group II).Conclusion: Results revealed that administration of ASII played a crucial role in the reduction of cataract formation in diabetic and hypertensive models.

关键词： Isoflavonoid Oxidative stress Alstonia scholaris hypertension Diabetes Cataract

Generation of sub-wavelength and super-resolution longitudinally polarized non-diffraction beam using lens axicon

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Chinese Optics Letters 2008年第10期6卷 785-787页

作者： K.B.rajesh P.m.Anbarasan Department of Physics Periyar UniversitySalem 636011India

It is well known that a light spot of sub-wavelength will diverge in all directions. In this letter, A method is presented for generating sub-wavelength （0.44λ） longitudinally polarized beam, which propagates without divergence over lengths of about 2λ in free space. This is achieved by a high numerical aperture （NA） lens axicon that utilizes spherical aberration to duplicate the performance of an axicon and to create an extended focal line.

关键词： Azimuthally polarized beams Fresnel zones high numerical aperture optics Laser beams Optical data storage Superresolution

Spin-Relaxation of NiO Encapsulated Gd_2O_3 Core–Shell Nanoparticles

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Acta metallurgica Sinica(English Letters) 2014年第2期27卷 253-258页

作者： A.rajesh m.manivel Raja K.Gurunathan Department of Nanoscience and Technology Science BlockAlagappa University Defence metallurgical Research Laboratory

Nickel oxide encapsulated gadolinium oxide （Gd203~IiO） core-shell nanoparticles （Nps） has been synthesized by polyol method and analyzed by transmission electron microscopy. The particle size is found to vary from 25 to 35 nm. Raman spectra show the gadolinium oxide core material peaks are found to be diminished by the mass effect of the NiO shell material. The dynamics of the magnetic moment has been studied with the help of temperature dependent electron paramagnetic resonance （EPR） spectroscopy. Peak-to-peak line width （Ahpp） value of the EPR spectra increases with decreasing temperature. Temperature dependence of line width shows the dominance of spin-lattice relaxation in these systems, and it can be used as T~ contrast agent. Spin number estimated from EPR studies increases with the decrease of the temperature. The interfacial exchange coupling between the core and shell region is found to be existing at very low temperatures as determined by EPR studies in this non-magnetic/antiferromagnetic （Nm/AFm） core/shell nanosystem. The effects of the temperature on the magnetic properties of the Gd203/NiO core/shell NPs and the underlying mechanism have been discussed.

关键词： Nanocomposite magnetic material Raman spectroscopy Electron paramagnetic resonance(EPR) Spin-relaxation

Potential application of graphene oxide and Aspergillus niger spores with high adsorption capacity for recovery of europium from red phosphor,compact fluorescent lamp and simulated radioactive waste

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Journal of Rare Earths 2023年第1期41卷 157-166页

作者： B.Arunraj Vidya rajesh N.rajesh Department of Chemistry Birla Institute of Technology and Science-PilaniHyderabad CampusShameerpetHyderabad 500078India Department of Biological Sciences Birla Insttute of Technology and Science-PilaniHyderabad CampusShameerpetHyderabad 500078India

The recovery of rare earth elements(REEs) is a global challenge and the mining of rare earths has serious environmental implications due to the toxic waste released post ***,the rising demand for rare earths and their far reaching electronic applications necessitates an effective strategy to recover the REEs from more viable *** this work,the graphene oxide-Aspergillus niger spores(*** spores) blend was utilized for adsorptive recovery of a precious rare earth Eu(Ⅲ) and the adsorption variables like ph of the medium,adsorbent dosage,sorption kinetics,thermodynamics,and isotherm were optimized for the developed bioso *** adsorption process suits the Langmuir isotherm model with a maximum adsorption capacity of 147.3 mg/*** pseudo-second-order kinetics is a perfect fit to describe the adsorption *** results obtained through the Van’t hoff plot show negative free energy change(ΔG^(0)) which implies the spontaneity of the adsorption *** negative standard enthalpy change(Δh^(0)) values show that the nature of the adsorption process is *** analytical characterizations including Fourier transform infrared spectroscopy(FTIR),Raman,X-ray diffraction(XRD),X-ray photoelectron spectroscopy(XPS),Brunauer-Emmett-Teller(BET),thermal gravimetric analysis(TGA),and scanning electron microscopy-energy dispersive X-ray spectroscopy(SEm-EDX) were employed to study the *** features of *** spores biosorbent were applied to recover Eu(Ⅲ) from real samples such as fluorescent lamp phosphor,red phosphor powder,and a simulated radioactive waste solution.

关键词： Europium Graphene oxide Aspergillus niger Phosphor Radioactive waste Rare earths