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Chinese Journal of Chemistry 2007年第10期25卷 1555-1558页

作者： NAGARAJ, Adki SANJEEVA reddy, Cherkupally Department of Chemistry Kakatiya University Warangal-506 009 India

ZrOCl2 was found to be an effective Lewis acid catalyst for the solventless chemoselective conversion of aldehydes into geminal-diacetates in high yields at room temperature. Regeneration of the aldehydes from the acetals was also achieved using the same catalyst in water. The beneficial effect of microwave irradiation on the reaction was also described. Other advantages are the very low loading of catalyst, high yields achieved even on a gram scale, and considerably shortened reaction time compared to the conventional method.

关键词： zirconium oxychloride acetal chemoselective microwave irradiation

Synthesis of some new N,N'-diarylsubstituted methylene-bis-dihydro-2H-1,3-benzoxazines

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Chinese Chemical Letters 2008年第12期19卷 1407-1410页

作者： Cherkupally Sanjeeva reddy Mekala Raghu Department of Chemistry Kakatiya UniversityWarangal 506009India

The synthesis of a new series of six-membered N,N′-diarylsubstituted methylene-bis-dihydro-2H-1,3-benzoxazines （5a-e） was achieved in excellent yields by Mannich-type condensation of N,N′-diarylsubstituted methylene-bis-o-hydroxybenzyl amines （4a- e） with formaldehyde in chloroform at reflux. These amines （4a-e） were obtained by the reduction of N, Nr-diarylsubstituted methylene-bis-o-hydroxybenzyl imines （3a-e） with NaBH4, which inturn were obtained by the condensation of methylene-bissalicylaldehyde （2） with various substituted arylamines.

关键词： Methylene-bis-salicylaldehyde Marmich-type condensation Methylene-bis-1,3-benzoxazines

KOH activated carbon derived from biomass-banana fibers as an efficient negative electrode in high performance asymmetric supercapacitor

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Journal of Energy Chemistry 2017年第1期26卷 56-62页

作者： ChaitraK Vinny R T Sivaraman p Narendra reddy Chunyan Hu Krishna Venkatesh Vivek C S Nagaraju N Kathyayini N Department of Nanobiosciences Centre for Emerging TechnologiesJain Global CampusJain UniversityJakkasandra postKanakapura TalukRamanagara DistrictBangalore Rural 562112 KarnatakaIndia Naval Materials Research Laboratory DRDOAmbernathThane 421506India Department of Chemistry St.Joseph’s College P.G.Centre.46Langford RoadShanthinagarBangaloreKarnataka 560027India Research Resource Centre Visveswaraya Technological UniversityBelagaviIndia College of Chemistry Chemical Engineering and BiotechnologyDonghua UniversityShanghai 201620China National Engineering Research Center for Dyeing and Finishing of Textiles Donghua UniversityShanghai 201620China

Here we demonstrate the fabrication, electrochemical performance and application of an asymmetric supercapacitor (AS) device constructed with ss-Ni(OH)(2)/MWCNTs as positive electrode and KOH activated honeycomb-like porous carbon (K-pC) derived from banana fibers as negative electrode. Initially, the electrochemical performance of hydrothermally synthesized ss-Ni(OH)(2)/MWCNTs nanocomposite and K-pC was studied in a three-electrode system using 1 M KOH. These materials exhibited a specific capacitance (Cs) of 1327 Fig and 324 F/g respectively at a scan rate of 10 mV/s. Further, the AS device i.e., ss-Ni(OH)(2)/MWCNTs// K-pC in 1 M KOH solution, demonstrated a Cs of 156 F/g at scan rate of 10 mV/s in a broad cell voltage of 0-2.2 V. The device demonstrated a good rate capability by maintaining a Cs of 59 F/g even at high current density (25 A/g). The device also offered high energy density of 63 Wh/kg with maximum power density of 5.2 kW/kg. The AS device exhibited excellent cycle life with 100% capacitance retention at 5000th cycle at a high current density of 25 A/g. Two AS devices connected in series were employed for powering a pair of LEDs of different colors and also a mini fan. (C) 2016 Science press and Dalian Institute of Chemical physics, Chinese Academy of Sciences. published by Elsevier B.V. and Science press. All rights reserved.

关键词： Asymmetric supercapacitor device Activated porous carbon High energy density Cyclability power source

Model predictive Control of Resonant Systems Using Kautz Model

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International Journal of Automation and computing 2016年第5期13卷 501-515页

作者： Shamik Misra Rajasekhara reddy prabirkumar Saha Department of Chemical Engineering Indian Institute of Technology Guwahati

The scope of this paper broadly spans in two areas： system identification of resonant system and design of an efficient control scheme suitable for resonant systems. Use of filters based on orthogonal basis functions （OBF） have been advocated for modelling of resonant process. Kautz filter has been identified as best suited OBF for this purpose. A state space based system identification technique using Kautz filters, viz. Kautz model, has been demonstrated. Model based controllers are believed to be more efficient than classical controllers because explicit use of process model is essential with these modelling techniques. Extensive literature search concludes that very few reports are available which explore use of the model based control studies on resonant system. Two such model based controllers are considered in this work, viz. model predictive controller and internal model controller. A model predictive control algorithm has been developed using the Kautz model. The efficacy of the model and the controller has been verified by two case studies, viz. linear second order underdamped process and a mildly nonlinear magnetic ball suspension system. Comparative assessment of performances of these controllers in those case studies have been carried out.

关键词： Model predictive control resonant systems Kautz model orthonormal basis function internal model control

Genetic variation for phytic acid content in mungbean(Vigna radiata L. Wilczek)

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The Crop Journal 2015年第2期3卷 157-162页

作者： Vinod Janardan Dhole Kandali Srinivasalu reddy Nuclear Agriculture and Biotechnology Division Bhabha Atomic Research Centre

Mungbean(Vigna radiata L. Wilczek) is a short-duration legume crop cultivated for seeds that are rich in protein and carbohydrates. Mungbeans contain phytic acid(pA), an anti-nutritional factor that is the main storage form of organic phosphorus in seeds. It is a strong inhibitor against the absorption of nutrients including iron, zinc, calcium and magnesium in monogastric animals. Genotypes with low phytic acid(lpa) in seed may show increased assimilation of nutrients and be useful in breeding lpa cultivars. The present study was conducted to identify lpa sources, genetic variation, heritability, and association with seed coat color, inorganic phosphorus(Ip), and seed size in 102 mungbean genotypes including released varieties, land races, mutants, and wild species grown in two seasons: summer 2011 and rabi 2012. pA and Ip in dry seeds were estimated by modified colorimetric method and Chen's modified method,respectively. pA, Ip, and 100-seed weight differed significantly in the two seasons. pA content in102 genotypes ranged from 5.74 to 18.98 mg g-1and 5.85 to 20.02 mg g-1in summer 2011 and rabi 2012, respectively. High heritability was found for pA(0.87 and 0.86) and seed size(0.82 and0.83) but low heritability for Ip(0.61 and 0.60). A negative correlation was found between pA and seed size(r =-0.183 and-0.267). Yellow and green seed coat genotypes contained significantly less pA than black seed coat genotypes. Cluster analysis revealed the distinctness of wild species, land races and cultivated varieties on the basis of pA content. The genotypes YBSM(6.001 mg g-1) and JL-781(6.179 mg g-1) showed lowest pA. These lpa sources can be used to develop high-yielding mungbean cultivars with low phytic acid.

关键词： Mungbean phytic acid Inorganic phosphorus Cluster analysis

Knoevenagel condensation of α,β-unsaturated aromatic aldehydes with barbituric acid under non-catalytic and solvent-free conditions

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Chinese Chemical Letters 2007年第12期18卷 1431-1435页

作者： Cherkupally Sanjeeva reddy Adki Nagaraj Department of Chemistry Kakatiya UniversityWarangal 506009India

An efficient route for the synthesis of 5-（arylpropenylidine）-2,4,6-pyrimidinetrione 3 from an appropriate α,βunsaturated aromatic aldehydes 1 and barbituric acid 2 under both non-catalytic and solvent-free microwave irradiation conditions was described. In this way, a range of biologically important compounds 3 was obtained in good to excellent yields （86-98%） in a very short reaction time （30-80 s）.

关键词： Barbituric acid Knoevenagel condensation 5-(Arylpropenylidine)-2,4,6-pyrimidinetrione

ERCp wire systems: The long and the short of it

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World Journal of Gastroenterology 2009年第1期15卷 55-60页

作者： Shilpa Chandrupatla reddy peter V Draganov Department of Medicine University of Florida College of MedicineJacksonville Florida 32610 United States Department of Gastroenterology Hepatology and Nutrition University of Florida1600 SW Archer Rd Room HD 602 PO Box 100214 Gainesville Florida 32610 United States

Guidewires are routinely used at the time of endoscopic retrograde cholangiopancreatography (ERCp) to gain and maintain access to the desired duct and aid in the advancement of various devices. Limitations of the traditional long-wire systems have led to the introduction of three proprietary short-wire systems. These systems differ in many respects but share two main principles: They lock a shorter wire in position to allow advancement or removal of various devices without displacement of the wire and they all allow for physician control of the wire. In this comprehensive review, we describe the key features of the three currently available short-wire systems: RX, Fusion and V systems. We also focus on the potential benef its and drawbacks that accompany the short-wire concept as a whole and each specif ic system in particular. Although the available data are limited, it appears that the use of the short-wire systems lead to reduced procedure, fluoroscopy and device exchange times, decreased sedation requirements, improved wire stability and increased endoscopist control of the wire. Furthermore, the physician-controlled wire-guided cannulation has the potential to decrease ampullary trauma and the rate of post-ERCp pancreatitis. The short guidewire systems appear to be an improvement over the traditional long-wire systems but further studies directly comparing the two approaches are needed.

关键词： Endoscopic retrograde cholangiopancreatography Guidewires V-system RX system Fusion system

Major geologic events of the Cauvery Basin,India and their correlation with global signaturese——A review

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Journal of palaeogeography 2017年第1期6卷 69-83页

作者： R.Nagendra A.Nallapa reddy Department of Geology Anna UniversityChennai600025India

The present review is aimed at correlating major geologic events of the Cauvery Basin with analogous global episodes. The Cauvery Basin came into existence due to Gondwana break up during Late Jurassic-Early Cretaceous by taphrogenic rift process. The first marine transgression close to Aptian/Albian boundary at the western margin of the basin terminates the syn-rift tectonic phase, which is also precise in adjoining Krishna-Godavari （KG） Basin. Two regional tectonic episodes are well documented in the basin which have global significance viz. （1） A major basinal uplift during late Turonian caused by Marion hot mantle plume resulted in widespread subaqueous volcanism in the southern part of the Cauvery Basin. This uplift also ted to relative sea level （RSL） fall of about 100 m in Cauvery and KG Basins and an unconformity of a magnitude of 2.3 Ma. The RSL fatt closely correlates with global sea level faU. This volcanic episode also resulted in Madagascar detachment from India. （2） The reunion hot mantle plume that ted to Deccan volcanism in central India resulted in E-SE tilt of the Cauvery Basin during upper Maastrichtian （CFI-CF3 zones）. This tilt caused a sea level fall of about 80 m and lateral withdrawal of sea by about 50 km developing a major erosional unconformity ranging in magnitude of -1.8-30 My. The magnitude of RSL correlates wetl with global sea level fall. This sea level fall caused widespread development of canyon features in the Cauvery Basin resulting in differential subaqueous erosion. The globally significant ocean anoxic events viz. OAE-Ib, OAE-1d, OAE-2 and OAE-3 are fairly discernible in the Cauvery Basin. The new isotopic palaeotemperature data suggests that southern India and Madagascar were located apparently in middle latitudes within the tropical-subtropical climatic zone during Atbian and early Maastrichtian. The magnitude of hiatus across K-pg boundary varying from 0 to 30 Ma is estimated based on ptanktic foraminifera for subsurface sec

关键词： Cauvery Basin Correlation Geologic events Global episodes

Microstructure,mechanical and corrosion behavior of high strength AA7075aluminium alloy friction stir welds-Effect of post weld heat treatment

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Defence Technology（防务技术） 2015年第4期11卷 362-369页

作者： p.Vijaya Kumar G.Madhusudhan reddy K.Srinivasa Rao Department of Mechanical Engineering R.I.T. Defence Metallurgical Research Laboratory Department of Metallurgical Engineering Andhra University

High strength aluminium alloy AA7075(Al-Zn-Mg-Cu) is a precipitate hardenable alloy widely used in the aerospace,defense,marine and automobile *** of the heat treatable aluminium alloys in all these sectors is ever-increasing owing to their excellent strength-toweight ratio and reasonably good corrosion *** shortage in corrosion resistance,however,usually poses negative concern about their reliability and lifetime when they service in the variable marine *** alloys also exhibit low weldability due to poor solidification microstructure,porosity in fusion zone and lose their mechanical properties when they are welded by fusion welding *** stir welding(FSW) is a reliable technique to retain the properties of the alloy as the joining takes place in the solid *** welds are susceptible to corrosion due to the microstructural changes in the weld nugget during *** this work,the effect of post weld treatments,viz.,peak aging(T6) and retrogression & reaging(RRA),on the microstructure,mechanical properties and pitting corrosion has been *** stir welding of 8 mm-thick AA7075 alloy was carried *** microstructural changes of base metal and nugget zone of friction stir welds were studied using optical microscopy,scanning electron microscopy and transmission electron *** and hardness test of base metal and welds has been carried *** corrosion resistance was determined through dynamic polarization *** was observed that the hardness and strength of weld were observed to be comparatively high in peak aged(T6) condition but the welds showed poor corrosion *** resistance to pitting corrosion was improved and the mechanical properties were maintained by RRA *** resistance to pitting corrosion was improved in RRA condition with the minimum loss of weld strength.

关键词： 7075铝合金高强度铝合金搅拌摩擦焊耐腐蚀性热处理效果微观结构焊缝机械性能

Microstructure and pitting corrosion of armor grade AA7075 aluminum alloy friction stir weld nugget zone-Effect of post weld heat treatment and addition of boron carbide

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Defence Technology（防务技术） 2015年第2期11卷 166-173页

作者： p.VIJAYA KUMAR G.MADHUSUDHAN reddy K.SRINIVASA RAO Department of Mechanical Engineering R.I.T. Defence Metallurgical Research Laboratory Department of Metallurgical Engineering Andhra University

Friction stir welding(FSW) of high strength aluminum alloys has been emerged as an alternative joining technique to avoid the problems during fusion *** recent times FSW is being used for armor grade AA7075 aluminum alloy in defense,aerospace and marine applications where it has to serve in non uniform loading and corrosive *** though friction stir welds of AA7075 alloy possess better mechanical properties but suffer from poor corrosion *** present work involves use of retrogression and reaging(RRA) post weld heat treatment to improve the corrosion resistance of welded joints of aluminum *** attempt also has been made to change the chemical composition of the weld nugget by adding B4C nano particles with the aid of the FSW on a specially prepared base metal plate in butt *** effects of peak aged condition(T6),RRA and addition of B4C nano particles on microstructure,hardness and pitting corrosion of nugget zone of the friction stir welds of AA7075 alloy have been *** though RRA improved the pitting corrosion resistance,its hardness was slightly *** improvement in pitting corrosion resistance was achieved with addition of boron carbide powder and post weld heat treatment of RRA.

关键词： 7075铝合金搅拌摩擦焊焊后热处理碳化硼颗粒抗点蚀微观结构装甲 7075合金