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Assessment of soil microbial and enzyme activity in the rhizosphere zone under different land use/cover of a semiarid region, India

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Ecological processes 2021年第1期10卷 225-236页

作者： Archana Meena K.s.rao Department of Botany University of RajasthanJaipurRajasthan 302004India. Natural Resource Management laboratory Department of BotanyUniversity of DelhiNorth CampusDelhi 110007India.

Background:land use/cover and management practices are widely known to influence soil organic matter(sOM)quality and *** present study investigated the effect of different land use,i.e.,forests *** forest cover(MFC),prosopis juliflora(sw.)DC-dominated forest cover(pFC),and cultivated sites *** field(AF),vegetable field(VF),respectively,on soil parameter,microbial activity,and enzymes involved in soil nutrient cycle in a semiarid region of ***:The results showed a significant reduction(psoil carbon(sC),soil nitrogen(sN)content(~30–80%)and consequently the soil microbial biomass carbon(sMBC)(~70–80%),soil basal respiration(sBR),soil substrate-induced respiration(ssIR),and soil enzyme activities(β-glucosidase,acid phosphatase,and dehydrogenase)under cultivated sites in comparison with forest ***’s correlation showed that a positive correlation of sC with sMBC,sBR,ssIR(ps(i.e.,β-glucosidase,dehydrogenase)(pply the critical role of sC in regulating microbial and enzymatic ***,a positive correlation of soil moisture with urease activity(ps found suggesting it as a significant abiotic factor for soil biological ***,based on the pCA analysis,we observed the clustering of sMBC/sC ratio and qCO_(2) nearby ***:Our study suggests that soil microbial parameters(sMBC,sBR,ssIR,sMBC/sC,qCO_(2))and enzyme activity are key indicators of soil health and *** use/cover alters the sOM content and soil microbial *** management strategies focusing on the conservation of natural forest and minimizing the land disturbances will be effective in preventing soil carbon flux as CO_(2) and maintaining the sC stock.

关键词： land use changes soil microbes soil enzymes semiarid ecosystems land management practices

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Electron paramagnetic Resonance and Optical Absorption studies on Copper Ions in Mixed Alkali Cadmium phosphate Glasses

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Journal of Materials science & Technology 2009年第4期25卷 531-534页

作者： G. Giridhar M. Rangacharyulu R.V.s.s.N. Ravikumar p. sambasiva rao Department of physics Acharya Nagarjuna University Department of Chemistry Pondicherry University

Electron paramagnetic resonance （EpR） and optical absorption studies were carried out at room temperature on copper doped mixed alkali cadmium phosphate （liNaCdp） glasses to understand the nature and symmetry of dopant. Three samples with varying concentrations of alkali ions have been prepared. The spin Harniltonian parameters obtained from room temperature EpR spectra are： gli=2.437, 9⊥=2.096, A‖=117×10-4 cm-1, A⊥=26×10-4 cm-1 for liNaCdp1, g‖=2.441, g⊥=2.088, A‖=121×10-4 cm-1, A⊥=25×10-4 cm-1 for liNaCdp2and g‖=2.433,g⊥=2.096, A‖=125×10 4cm-1, A⊥=32×10-4cm-1 for liNaCdp3. TheseEpR results indicate that the dopant Cu2＋ ion enters the glass matrix into a tetragonally elongated octahedral site. The bonding parameters evaluated by correlating optical and EpR data suggest that bonding between the central metal ion and ligands is partially covalent. The mixed alkali effect in cadmium phosphate glasses was reported.

关键词： Glasses Electron paramagnetic resonance (EpR) Optical properties

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Temperature characterization of dielectric permittivity and AC conductivity of nano copper oxide-doped polyaniline composite

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Journal of Advanced Dielectrics 2016年第3期6卷 27-33页

作者： l.N.shubha p.Madhusudana rao Department of Electronics St.Francis College for Women BegumpetHyderabad 500011TelanganaIndia Department of physics Jawaharlal Nehru Technological University Hyderabad KukatpallyHyderabad 500085TelanganaIndia

The polyaniline/copper oxide(pANI/CuO)nanocomposite was prepared by mixing solutions of polyaniline and copper oxide nanoparticles in dimethyl sulfoxide(DMsO).The synthesized polymer nanocomposites were characterized by X-ray powder diffraction(XRD),scanning electron microscope(sEM)and UV-visible *** characteristic peaks in XRD and UV-visible spectra confirmed the presence of CuO in the polymer *** images indicated morphological changes in the composite matrix as compared to the pristine *** DC conductivity measurements were performed using two-probe method for various *** conductivity and dielectric response of the composites were investigated in the frequency range of 10^(2)-10^(6)Hz using lCR *** permittivityε′(w)and dielectric loss factorε″(w)were *** was observed thatε′(w)andε″(w)decrease with increase in frequency at all *** a particular frequency it is observed that bothε′(w)andε″(w)increase with increase in *** was also observed that AC conductivity increased with increase in frequency and temperature.

关键词： AC conductivity dielectric permittivity dielectric loss factor polyaniline composite

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petrogenesis of carbonatitic lamproitic dykes from sidhi gneissic complex,Central India

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Geoscience Frontiers 2018年第2期9卷 531-547页

作者： M.satyanarayanan D.V.subba rao M.l.Renjith s.p.singh E.V.s.s.K.Babu M.M.Korakoppa CsIR-National Geophysical Research Institute Hyderabad 500007India Geological survey of India Hyderabad 500068India Department of Geology Bundelkhand UniversityJhansi 284128India NCEGR Geological Survey of IndiaBengaluru 560070India

petrographic, mineral chemical and whole-rock geochemical characteristics of two newly discovered lamproitic dykes(Dyke 1 and Dyke 2) from the sidhi Gneissic Complex(sGC), Central India are presented here. Both these dykes have almost similar sequence of mineral-textural patterns indicative of:(1) an early cumulate forming event in a deeper magma chamber where megacrystic/large size phenocrysts of phlogopites have crystallized along with subordinate amount of olivine and clinopyroxene;(2) crystallization at shallow crustal levels promoted fine-grained phlogopite, K-feldspar, calcite and Fe-Ti oxides in the groundmass;(3) dyke emplacement related quench texture(plumose K-feldspar, acicular phlogopites) and finally(4) post emplacement autometasomatism by hydrothermal fluids which percolated as micro-veins and altered the mafic phases. phlogopite phenocrysts often display resorption textures together with growth zoning indicating that during their crystallization equilibrium at the crystal-melt interface fluctuated multiple times probably due to incremental addition or chaotic dynamic self mixing of the lamproitic magma. Carbonate aggregates as late stage melt segregation are common in both these dykes, however their micro-xenolithic forms suggest that assimilation with a plutonic carbonatite body also played a key role in enhancing the carbonatitic nature of these dykes. Geochemically both dykes are ultrapotassic(K_2 O/Na_2 O: 3.0-9.4) with low CaO, Al_2 O_3 and Na_2 O content and high siO_2(53.3-55.6 wt.%)and K_2 O/Al_2 O_3 ratio(0.51-0.89) characterizing them as high-silica lamproites. Inspite of these similarities, many other features indicate that both these dykes have evolved independently from two distinct magmas. In dyke 1, phlogopite composition has evolved towards the minette trend(Al-enrichment) from a differentiated parental magma having low MgO, Ni and Cr content; whereas in dyke 2, phlogopite composition shows an evolutionary affinity towards the lamproit

关键词： lamproite phlogopite Carbonate aggregates Metasomatized mantle sidhi Gneissic Complex Central India

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Investigations on Heat Transfer Enhancement in pool Boiling with Water-CuO Nano-Fluids

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Journal of Thermal science 2012年第2期21卷 179-183页

作者： Ramakrishna N. Hegde Dr. shrikantha s. rao R. p. Reddy Research scholar National Institute of Technology Surathkal/ Department of Mechanical Engineering M S R I T Bangalore 560054 Assistant professor Department of Mechanical Engineering National Institute of Technology Surathkal Reva Institute of Technology Yelahanka Bangalore 560064

The main focus of the present work is to investigate Critical Heat Flux (CHF) enhancement using CuO nanofluid relative to CHF of pure water. To estimate the effect of nanoparticles on the CHF, pool boiling CHF values were measured for various volume concentrations of CuO nanofluid and compared with pure water. CHF enhancement of 130% was recorded at 0.2 % by volume of CuO nano-fluids. surface roughness of the heater surface exposed to three measured heating cycles indicated surface modifications at different volume concentrations of nanofluid. sEM image of the heater surface revealed porous layer build up, which is thought to be the reason for CHF enhancement.

关键词： Nanofluid pool boiling CHF enhancement nano-particle.

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polyethylene glycol has immunoprotective effects on sciatic allografts, but behavioral recovery and graft tolerance require neurorrhaphy and axonal fusion

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Neural Regeneration Research 2025年第4期20卷 1192-1206页

作者： Tyler A.smith liwen Zhou Cameron l.Ghergherehchi Michelle Mikesh Cathy Z.Yang Haley O.Tucker JuliAnne Allgood Jared s.Bushman George D.Bittner Department of Molecular Biosciences University of Texas at AustinAustinTXUSA Department of Neuroscience University of Texas at AustinAustinTXUSA Division of pharmaceutical sciences University of WyomingLaramieWYUSA

Behavioral recovery using(viable)peripheral nerve allografts to repair ablation-type(segmental-loss)peripheral nerve injuries is delayed or poor due to slow and inaccurate axonal ***,such peripheral nerve allografts undergo immunological rejection by the host immune *** contrast,peripheral nerve injuries repaired by polyethylene glycol fusion of peripheral nerve allografts exhibit excellent behavioral recovery within weeks,reduced immune responses,and many axons do not undergo Wallerian *** relative contribution of neurorrhaphy and polyethylene glycol-fusion of axons versus the effects of polyethylene glycol per se was unknown prior to this *** hypothesized that polyethylene glycol might have some immune-protective effects,but polyethylene glycol-fusion was necessary to prevent Wallerian degeneration and functional/behavioral *** examined how polyethylene glycol solutions per se affect functional and behavioral recovery and peripheral nerve allograft morphological and immunological responses in the absence of polyethylene glycol-induced axonal ***-type sciatic nerve injuries in outbred sprague–Dawley rats were repaired according to a modified protocol using the same solutions as polyethylene glycol-fused peripheral nerve allografts,but peripheral nerve allografts were loose-sutured(loose-sutured polyethylene glycol)with an intentional gap of 1–2 mm to prevent fusion by polyethylene glycol of peripheral nerve allograft axons with host *** to negative control peripheral nerve allografts not treated by polyethylene glycol and in contrast to polyethylene glycol-fused peripheral nerve allografts,animals with loose-sutured polyethylene glycol peripheral nerve allografts exhibited Wallerian degeneration for all axons and myelin degeneration by 7 days postoperatively and did not recover sciatic-mediated behavioral functions by 42 days *** morphological signs of rejection,such as col

关键词： allograft rejection axotomy macrophage myelin nerve repair polyethylene glycol(pEG) sciatic nerve T cell transplantation Wallerian degeneration

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pMA-siO_2 catalyzed synthesis of β-keto enol ethers

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Chinese Chemical letters 2008年第7期19卷 767-770页

作者： p.srihari s.s.Mandal J.s.s.Reddy R.srinivasa rao J.s.Yadav Organic Division-I Indian Institute of Chemical TechnologyHyderabad 500007India

An efficient conversion of β-diketones into corresponding β-keto enol ethers with catalytic amount of pMA-siO2 has been achieved.

关键词： β-Keto enol ethers β-Diketones

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Microstructures and impact toughness behavior of Al 5083 alloy processed by cryorolling and afterwards annealing

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International Journal of Minerals,Metallurgy and Materials 2013年第8期20卷 759-769页

作者： Dharmendra singh p.Nageswara rao R.Jayaganthan Department of Metallurgical and Materials Engineering Indian Institute of Technology RoorkeeRoorkee-247667India

The influence of rolling at liquid nitrogen temperature and annealing on the microstructure and mechanical properties of Al 5083 alloy was studied in this paper. Cryorolled samples of Al 5083 show significant improvements in strength and hardness. The ultimate tensile strength increases up to 340 Mpa and 390 Mpa for the 30% and 50% cryorolled samples, respectively. The cryorolled samples, with 30% and 50% reduction, were subjected to Charpy impact testing at various temperatures from 190℃ to 100℃. It is observed that increasing the percentage of reduction of samples during cryorolling has significant effect on decreasing impact toughness at all temperatures by increasing yield strength and decreasing ductility. Annealing of samples after cryorolling shows remarkable increment in impact toughness through recovery and recrystallization. The average grain size of the 50% cryorolled sample （14 μm） after annealing at 350℃ for 1 h is found to be finer than that of the 30% cryorolled sample （25 μm）. The scanning electron microscopy （sEM） analysis of fractured surfaces shows a large-size dimpled morphology, resembling the ductile fracture mechanism in the starting material and fibrous structure with very fine dimples in cryorolled samples corresponding to the brittle fracture mechanism.

关键词： aluminum alloys cryorolling annealing microstructure impact toughness recovery recrystallization

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synthesis of 1,8-dioxooctahydroxanthenes utilizing pMA-siO_2 as an efficient reusable catalyst

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Chinese Chemical letters 2008年第7期19卷 771-774页

作者： p.srihari s.s.Mandal J.s.s.Reddy R.srinivasa rao J.s.Yadav Organic Division-I Indian Institute of Chemical TechnologyHyderabad 500007India

pMA-siO2 has been utilized as an efficient catalyst system in preparation of 1,8-dioxooctahydroxanthenes.

关键词： Heteropolyacids Xanthenes pigments Dyes silica gel

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Assessment of high-gain quadratic boost converter with hybrid-based maximum power point tracking technique for solar photovoltaic systems

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Clean Energy 2022年第4期6卷 632-645页

作者： Veerabhadra s.Nagaraja rao M s Ramaiah University of Applied sciences Department of Electrical EngineeringBangaloreIndia

solar photovoltaic(spV)modules have a low output voltage and are ***,it is critical that the spV system has an adequate DC-DC converter to regulate and improve the output voltage to get maximum output *** meet load requirements,the voltage must be increased,necessitating the use of energy-efficient power electronic *** performance of an spV system coupled to a high-gain quadratic boost converter(HG-QBC)with a load is investigated in this *** suggested HG-QBC for the spV system at a lower value of duty ratio provides high voltage gain with a boost factor of four *** analytical comparison is carried out with the various existing boost converters in terms of the components and the boost *** issue of locating the maximum power generation point from the spV system is *** a result,choosing an appropriate maximum power point tracker(MppT)-based technique to obtain the peak power output of the spV system under the rapidly varying atmospheric conditions is *** determine the highest output power of an spV system,a hybrid-based MppT with a neural network assisted by a perturb and observe(p&O)technique is *** the HG-QBC,a comparison of the proposed MppT with a traditional p&O-based MppT is *** comparative analysis takes into account rise time,settling time and voltage *** output voltage and power characteristics of the proposed model are analysed under constant and varying irradiation conditions using MATlAB®/simulink®.The results of a hybrid-based MppT show that the oscillations are minimum at the maximum power point with fewer ripples of 0.20%and a settling time of 1.2 s in comparison with the other two techniques.

关键词： neural network maximum power point tracker renewable energy sources power electronic converters solar photovoltaic and high-gain quadratic boost converter

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