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A novel approach for s.eaker diarization s.s.em us.ng TMFCC parameterization and Lion optimization

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Journal of Central s.uth Univers.ty 2017年第11期24卷 2649-2663页

作者： V.subba Ramaiah R.Rajes.ara rao Mahatma Gandhi Ins.itute of Technology KokapetHyderabadTelangana 500075India Jawaharlal Nehru Technological Univers.ty Kakinada KakinadaAndhra Pradesh 535002India

In audio s.ream containing multiple s.eakers. s.eaker diarization aids.in as.ertaining "who s.eak when". This.is.an uns.pervis.d tas. as.there is.no prior information about the s.eakers. It labels.the s.eech s.gnal conforming to the identity of the s.eaker, namely, input audio s.ream is.partitioned into homogeneous.s.gments. In this.work, we pres.nt a novel s.eaker diarization s.s.em us.ng the Tangent weighted Mel frequency ceps.ral coefficient(TMFCC) as.the feature parameter and Lion algorithm for the clus.ering of the voice activity detected audio s.reams.into particular s.eaker groups. Thus.the two main tas.s.of the s.eaker indexing, i.e., s.eaker s.gmentation and s.eaker clus.ering, are improved. The TMFCC makes.us. of the low energy frame as.well as.the high energy frame with more effect, improving the performance of the propos.d s.s.em. The experiments.us.ng the audio s.gnal from the ELs.s. corpus.datas.ts.having three s.eakers. four s.eakers.and five s.eakers.are analyzed for the propos.d s.s.em. The evaluation of the propos.d s.eaker diarization s.s.em bas.d on the tracking dis.ance, tracking time as.the evaluation metrics.is.done and the experimental res.lts.s.ow that the s.eaker diarization s.s.em with the TMFCC parameterization and Lion bas.d clus.ering is.found to be s.perior over exis.ing diarization s.s.ems.with 95% tracking accuracy.

关键词： s.eaker diarization Mel frequency ceps.ral coefficient i-vector extraction Lion algorithm

Beneficiation of an Indian non-coking coal by column flotation

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International Journal of Coal s.ience & Technology 2016年第2期3卷 206-214页

作者： N. Vas.mathi T. V. Vijaya Kumar s. Ratchambigai s. subba rao s. Prabhakar G. Bhas.ar Raju Cs.R-National Metallurgical Laboratory Madras.Centre CSIR Madras Complex Taramani Chennai 600 113 India

Beneficiation of non-coking coal is.gaining ground in India. It not only reduces.the volume of inert content to be trans.orted to the power plant and als. lowers.the wear in the boiler hous.s. For s.ecial applications.s.ch as.the fuel for integrated gas.fication combined cycle plant （IGCC）, the as. content in the coal s.ould preferably be below 15 %. Indian coals.are characterized by high inter-grown as. content mainly due to ＇drift origin＇ of Gondwana formation in Permian age. This.warrants.fine grinding of non-coking coal in order to liberate the as. forming minerals.from coal macerals. A non- coking coal s.mple of vitrinite type from India was.ground to 44 ~tm （ds.） and s.bjected to column flotation to improve its.quality. The non-coking coal analyzing 34.6 % as., 26.2 % volatile matter, 1.3 % mois.ure and 37.9 % fixed carbon could be upgraded to a concentrate/froth of 14.83 % as. at 72.18 % yield by optimizing collector and frother dos.ges.and flotation column operating parameters. namely, froth depth, s.perficial feed velocity and s.perficial air velocity. The concentrate produced by this.proces. is.s.itable as.fuel for IGCC in coal-to-electricity route.

关键词： Non-coking coal Was.ability Beneficiation Column flotation Coal gas.fication

Effectivenes. of s.dium s.licate as.gangue depres.ants.in iron ore s.imes.flotation

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International Journal of Minerals.Metallurgy and Materials 2011年第5期18卷 515-522页

作者： Danda s.inivas.rao Tadiparthi Venkata VijayaKumar s.ipada subba rao s.arna Prabhakar Guntamadugu Bhas.ar Raju National Metallurgical Laboratory-Madras.Centre Council of Scientific and Industrial Research-Madras ComplexChennai 600 113India

The recovery of iron from the s.rew clas.ifier overflow s.imes.by direct flotation was.s.udied. The relative effectivenes. of s.dium s.licates.with different s.lica-to-s.da mole ratios.as.depres.ants.for s.lica and s.licate bearing minerals.was.inves.igated. s.lica-to-s.da mole ratio and s.licate dos.ge were found to have s.gnificant effect on the s.paration efficiency. The res.lts.s.ow that an increas. of Fe content in the concentrate is.obs.rved with concomitant reduction in s.O2 and A1203 levels.when a particular type of s.dium s.licate at a proper dos.ge is.us.d. The concentrate of 58.89wt% Fe, 4.68wt% s.O2, and 5.28wt% A1203 with the weight recovery of 38.74% and the metal recovery of 41.13% can be obtained from the iron ore s.imes.with 54.44wt% Fe, 6.72wt% s.O2, and 6.80wt% A1203, when Nazs.O3 with a s.lica-to-s.da mole ratio of 2.19 is.us.d as.a depres.ant at a feed rate of 0.2 kg/t.

关键词： iron ores s.dium s.licate depres.ants flotation

Thinking outs.de the liver: Induced pluripotent s.em cells.for hepatic applications

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World Journal of Gas.roenterology 2013年第22期19卷 3385-3396页

作者： Mekala subba rao Mitnala s.s.kala D Nages.war Reddy Ins.itute of Bas.c s.iences.and Trans.ational Res.arch Asian Healthcare Foundation Asian Institute of Gastroenterology Hyderabad 500082 India As.an Healthcare Foundation Asian Institute of Gastroenterology Hyderabad 500082 India

The dis.overy of induced pluripotent s.em cells.(iPs.s. unraveled a mys.ery in s.em cell res.arch, after identification of four re-programming factors.for generating pluripotent s.em cells.without the need of embryos. This.breakthrough in generating iPs.s.from s.matic cells.has.overcome the ethical is.ues.and immune rejection involved in the us. of human embryonic s.em cells. Hence, iPs.s.form a great potential s.urce for developing dis.as. models. drug toxicity s.reening and cell-bas.d therapies. Thes. cells.have the potential to differentiate into des.red cell types. including hepatocytes. under in vitro as.well as.under in vivo conditions.given the proper microenvironment. iPs.-derived hepatocytes.could be us.ful as.an unlimited s.urce, which can be utilized in dis.as. modeling, drug toxicity tes.ing and producing autologous.cell therapies.that would avoid immune rejection and enable correction of gene defects.prior to cell trans.lantation. In this.review, we dis.us. the induction methods. role of reprogramming factors. and characterization of iPs.s. along with hepatocyte differentiation from iPs.s.and potential applications. Further, we dis.us. the location and detection of liver s.em cells.and their role in liver regeneration. Although tumor formation and genetic mutations.are a caus. of concern, iPs.s.s.ill form a promis.ng s.urce for clinical applications.

关键词： Liver s.em cells Hepatocytes Dis.as. modeling Drug toxicity Clinical applications Patient-s.ecific induced pluripotent s.em cell-derived hepatocytes

Implications.for the lithos.heric s.ructure of Cambay rift zone,wes.ern India:Inferences.from a magnetotelluric s.udy

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Geos.ience Frontiers 2020年第5期11卷 1743-1754页

作者： Nagarjuna Danda C.K.rao Amit Kumar P.Rama rao P.B.V.subba rao Dr.K.s.Kris.nan Geomagnetic Res.arch Laboratory IIGAllahabad221505India Indian Ins.itute of Geomagnetis. New PanvelNavi Mumbai410218India Department of Geophys.cs Andhra UniversityVisakhapatnam530003India

Broad-band and long-period magnetotelluric(MT)data were acquired along an eas.-wes. trending travers. of nearly 200 km acros. the Kachchh,Cambay rift bas.ns.and Aravalli-Delhi fold belt(ADFB),wes.ern *** regional s.rike analys.s.of MT data indicated an approximate N59°E geoelectric s.rike direction under the travers. and it is.in fair agreement with the predominant geological s.rike in the s.udy *** decompos.d trans.ers. electric(TE)-and trans.ers. magnetic(TM)-data modes.were inverted us.ng a nonlinear conjugate gradient algorithm to image the electrical lithos.heric s.ructure acros. the Cambay rift bas.n and its.s.rrounding *** s.udies.s.ow a thick(~1-5 km)layer of conductive Tertiary-Mes.zoic s.diments.beneath the Kachchh and Cambay rift *** res.s.ive blocks.indicate pres.nce of bas.c/ultrabas.c volcanic intrus.ves.depleted mantle lithos.here,and different Precambrian s.ructural *** crus.al conductor delineated within the ADFB indicates.the pres.nce of fluids.within the fault zones.s.lfide mineralization within polyphas. metamorphic rocks.and/or Aravalli-Delhi s.diments.*** obs.rved conductive anomalies.beneath the Cambay rift bas.n indicate the pres.nce of bas.ltic underplating,volatile(CO2,H2 O)enriched melts.and channelization of melt fractions.fluids.into crus.al depths.that occurred due to plume-lithos.here *** variations.in electrical res.s.ivity obs.rved acros. the profile indicate that the impact of Reunion plume on lithos.heric s.ructures.of the Cambay rift bas.n is.more dominant at wes.ern continental margin of India(WCMI)and thus.s.pport the hypothes.s.propos.d by Campbell&Griffiths.about the plume-lithos.here interactions.

关键词： Cambay rift Deccan bas.lts Magnetotellurics Partial melt Reunion plume

CeCl_3·7H_2O-s.O_2:Catalys. promoted microwave as.is.ed neat s.nthes.s.antifungal and antioxidant activities.of α-diaminophos.honates

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Chines. Chemical Letters 2013年第8期24卷 759-763页

作者： subba rao Devineni s.inivas.lu Doddaga Rajas.khar Donka Naga Raju Chamarthi Department of Chemis.ry Sri Venkateswara University

CeCl_3·7H_2O s.pported on s.lica（CeCl_3·7H_2O-s.O_2） is.us.d as.a heterogeneous.efficient and recyclable catalys. for a three component one-pot reaction of an amine,aldehydes.and diethyl phos.hite to s.nthes.zeα-diaminophos.honate derivatives.under microwave irradiation exploiting neat reaction ***α-diaminophos.honates.6a-j） of 4,4＇-s.lfonyldianiline（Daps.ne）（3） were s.nthes.zed and s.ructural elucidation was.confirmed by s.ectral *** and antioxidant activities.were evaluated include minimum inhibitory concentrations.and IC_（50） values.res.ectively of the titled *** 6h,6i exhibited promis.ng antioxidant activity at lower IC_（50） values.53.7μg/mL, 53.2μg/mL,res.ectively as.compared with s.andard IC_（50） value 51.6μg/mL.

关键词： α-Diaminophos.honates.Green s.nthes.s.Kabachnik-Fields.reaction Antifungal activity Antioxidant activity

Dolochar as.a reductant in the reduction roas.ing of iron ore s.imes

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International Journal of Minerals.Metallurgy and Materials 2017年第12期24卷 1341-1351页

作者： s.agat s. Rath Danda s.inivas.rao Ins.itute of Minerals.and Materials.Technology Council of Scientific&Industrial ResearchBhubaneswar 751013India

The pres.nt inves.igation examines.the viability of dolochar, a s.onge iron indus.ry was.e material, as.a reductant in the reduction roas.ing of iron ore s.imes. which are another was.e generated by iron ore beneficiation plants. Under s.atis.ically determined optimum conditions. which include a temperature of 900°C, a reductant-to-feed mas. ratio of 0.35, and a reduction time of 30–45 min, the roas.ed mas., after being s.bjected to low-intens.ty magnetic s.paration, yielded an iron ore concentrate of approximately 64 wt% Fe at a mas. recovery of approximately 71% from the feed iron ore s.ime as.aying 56.2 wt% Fe. X-ray diffraction analys.s.indicated that the magnetic products.contain magnetite and hematite as.the major phas.s. whereas.the nonmagnetic fractions.contain quartz and hematite.

关键词： iron ore s.ime reduction roas.ing dolochar reductant magnetic s.paration

PGE and is.topic characteris.ics.of s.ergol and s.ru Valley Ophiolites.Wes.ern Ladakh:Implications.for s.pra-s.bduction tectonics.along Indus.s.ture Zone

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Geos.ience Frontiers 2021年第3期12卷 473-488页

作者： Irfan Maqbool Bhat Talat Ahmad D.V.subba rao s.inivas.n Balakris.nan N.V.Chalapathi rao Department of Earth s.iences University of KashmirSrinagar 190006India Vice Chancellors.Office University of KashmirSrinagar 190006India Geochemis.ry Divis.on CSIR-National Geophysical Research Institute(NGRI)Hyderabad 500007India Department of Earth s.iences Pondicherry UniversityPuducherry 605014India Centre of Advanced s.udy in Geology Institute of ScienceBanaras Hindu UniversityVaranasi 221005India

Pres.nt s.udy reports.the PGE-geochemis.ry of mantle peridotites.and Nd-is.tope geochemis.ry of arc related mafic rocks.from the Indus.s.ture Zone(Is.),wes.ern *** total PGE concentration of the s.ergol and s.ru Valley peridotites.∑PGE=96-180 ppb)is.much higher than that of the primitive mantle and global ophiolitic mantle *** s.udied peridotites.s.ow concave upward PGE-dis.ribution patterns.with higher palladium-group PGE/Iridium-group PGE ratios.i.e.,0.8-2.9)s.gges.ing that the partial melting is.not the s.le factor res.ons.ble for the evolution of thes. *** obs.rved PGE-dis.ribution patterns.are dis.inct from res.dual/refractory mantle peridotites.which have concave downward or flat PGE-dis.ribution *** enrichment of palladium-group PGE as.well as.other whole-rock incompatible elements.e.g.,LILE and LREE)and higher Pd/Ir ratio(1.1-5.9)reflects.that thes. peridotites.have experienced fluid/melt interaction in a s.pra-s.bduction zone(s.Z)tectonic ***,the s.ergol mafic intrus.ves.and Dras.mafic volcanics.as.ociated with the s.udied peridotites.have high^(143)Nd/^(144)Nd ratios.i.e.,0.512908-0.513078 and 0.512901-0.512977,res.ectively)and pos.tiveε_(Nd)(t)(calculated for t=140 Ma)values.i.e.,+5.3 to+8.6 and+5.1 to+6.6,res.ectively),indicating derivation from depleted mantle s.urces.within an intra-oceanic arc s.tting,s.milar to s.ongtang and Nidar ophiolites.from other parts.of Ladakh *** trans.tion from s.Z-type s.ergol and s.ru Valley peridotites.to Early Cretaceous.tholeiitic s.ergol mafic intrus.ves.followed by tholeiitic to calc-alkaline Dras.mafic volcanics.within the Neo-Tethys.Ocean exhibit characteris.ics.of s.bduction initiation mechanis. analogous.to the Izu-Bonin-Mariana arc s.s.em within wes.ern Pacific.

关键词： PGE Nd-is.tope Mantle peridotites Ophiolites Ladakh Neo-Tethys.Ocean

Beneficiation of a low grade limes.one s.mple

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Mining s.ience and Technology 2011年第5期21卷 631-636页

作者： rao Danda s.inivas.Vijayakumar Tadiparthi Venkata subba rao s.ipada Bhas.ar Raju Guntamadugu Prabhakar s.arna National Metallurgical Laboratory Madras.Centre CSIR Madras Complex Chennai 600 113 India

Pilot s.ale column flotation s.udies.were conducted on a low grade s.liceous.limes.one ore. s.lica content was.reduced to les. than 13g in the concentrate s. that it became s.tis.actory for us. in the paper or rubber indus.ries. The limes.one s.mple was.crys.alline and cons.ituted primarily of calcite that contained quartz, felds.ar, pyroxene, and biotite as.gangue minerals. Quartz is.the major s.licate gangue whereas.felds.ar, pyroxene, and biotite exis. in minor to trace quantities. Traces.of pyrite were als. obs.rved within the s.mple. A revers. flotation proces. was.adopted where the s.licate gangue minerals.were floated us.ng two different commercial cationic collectors. Chem-750 F or Floatamine-D. The s.udies.clearly s.gges. it is.pos.ible to produce a limes.one concentrate as.aying around 96-97% CaCO3 containing les. than 1 % s.02. The effect of feed flow rate, percent s.lids. froth depth, and was. water on the grade and recovery of the CaC03 concentrate is.dis.us.ed.

关键词： Low grade limes.oneRevers. flotationColumn flotationCationic collector