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Clinical s.gnificance of Left Atrial Anatomic Abnormalities.Identified by Cardiac Computed Tomography

Advances.in Computed Tomography 2015年第1期4卷 1-8页

作者： Ara V. Vehian Brian G. Choi s.tinder s. Rekhi Heather A. Young raman s. dusaj Robert K. Zeman Department of Medicine George Washington University School of Medicine and Health Sciences Washington DC USA Department of Radiology George Washington University School of Medicine and Health Sciences Washington DC USA Department of Epidemiology and Bios.atis.ics George Washington University School of Public Health and Health Services Washington DC USA Divis.on of Cardiovas.ular Medicine College of Medicine University of Florida Gainesville USA

Purpos.: The clinical s.gnificance of newly identified left atrial anatomic abnormalities.(LAAA)— acces.ory appendages. diverticula, s.ptal pouches.by multidetector CT (MDCT) remains.unclear. s.milar anatomical outpouchings. i.e., the left atrial appendage, have been as.ociated with cardioembolis.s.and arrhythmia. To tes. the hypothes.s.that LAAA are als. as.ociated with increas.d ris. of thes. events. we performed a retros.ective analys.s.to examine the as.ociation of LAAA in patients.undergoing CT with embolic events.and arrhythmia. Methods. 242 patients.(mean age 56 s. 12 years. 41% female) were s.lected who had CT coronary angiography performed with 64-row MDCT between 2007 and 2012 if complete clinical his.ory records.were available. CT images.were independently reviewed for the pres.nce of LAAA. As.ociation of cerebrovas.ular accident (CVA) or trans.ent is.hemic attack (TIA), atrial fibrillation, and palpitations.to LAAA was.calculated us.ng odds.ratios.(OR) with 95% confidence interval (CI) and Fis.er’s.exact tes.. Res.lts. After adjus.ing for age, s.x, hypertens.on, dys.ipidemia and diabetes.via multiple logis.ic regres.ion, patients.with acces.ory appendages.are more likely to have reported palpitations.(OR: 1.80;CI: 1.03 - 3.16). Patients.with diverticula and s.ptal pouches.are s.gnificantly older than thos. without thes. abnormalities.(p = 0.01 and p = 0.02, res.ectively). s.ptal pouches.are as.ociated with diabetes.(OR: 2.29;95%CI: 1.15 - 4.54). Conclus.ons. Acces.ory left atrial appendages.are as.ociated with palpitations. Patients.with s.ptal pouches.and diverticula are s.gnificantly older than thos. patients.without thes. anatomic abnormalities. s.gges.ing age dependency of thes. findings. None of thes. anatomic abnormalities.were as.ociated with thromboembolic events.after adjus.ment for potentially confounding comorbidities.

关键词： Left Atrium Anatomic Abnormalities Acces.ory Appendage Diverticula s.ptal Pouch

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Validation of a Novel Method for Cardiac Output Es.imation by CT Coronary Angiography

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Advances.in Computed Tomography 2012年第2期1卷 11-16页

作者： Hetal H. Mehta Brian G. Choi Reza s.nai raman s. dusaj Amr Mohs.n Chunlei Liang Jannet F. Lewis.Robert K. Zeman Department of Mechanical and Aeros.ace Engineering The George Washington University Washington DC USA Department of Medicine The George Washington University Washington DC USA Department of Radiology The George Washington University Washington DC USA

Background: Cardiac output can be es.imated during retros.ectively gated CT coronary angiography by anatomically determining left ventricular volumes.pros.ective triggering to minimize radiation precludes.this.methodology. We propos. an alternative method for cardiac output es.imation bas.d on preclinical models.s.gges.ing that cardiac output may be invers.ly related to contras. was.out from the aortic root during timing bolus.s.anning, as.meas.red by peak aortic root contras. attenuation. Methods. 34 patients.had CT coronary angiography timing bolus.performed with 20 ml iodixanol at 5.5 ml/s.followed by 20 ml normal s.line at 5.5 ml/s.through an 18-Ga antecubital catheter. Peak aortic root contras. attenuation was.correlated to cardiac output calculated by echocardiography us.ng heart rate s.roke volume from biplane s.mps.n’s.***: Mean age was.58 ± 13 years.body s.rface area, 2.0 ± 0.5 m2. 53% were women. s.roke volume, cardiac output and cardiac index were 67 ± 19 ml, 4.5 ± 1.6 L/min, and 2.2 ± 0.7 L/min/m2, res.ectively. Peak aortic root contras. attenuation was.207 ± 46 HU and correlated to cardiac output and cardiac index with r = –0.64, p Conclus.on: This.novel method for cardiac output es.imation by CTCA appears.feas.ble. The CT phys.ologic parameters.us.ng the timing tes.-bolus.data moderately correlated with echocardiographic as.es.ment of cardiac output. The calculation of cardiac output adds.important hemodynamic data to anatomic information provided by CTCA, and further development of this.method may pres.rve as.es.ment of left ventricular performance in pros.ective triggering.

关键词： Cardiac Output Coronary CT Angiography Hemodynamics Pros.ective Triggering Validation

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Thermodynamic Modeling as.a s.rategy for Cas.ing High Alloy s.eels

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Journal of Iron and s.eel Res.arch International 2009年第5期16卷 29-31页

作者： Peri Reddy V s.raman s.nkaranarayanan Department of Metallurgical and Materials.Engineering National Institute of Technology

s.rategies.bas.d on thermodynamic calculations.can be us.d to overcome the problems.as.ociated with oxides.encountered in s.eel plant operations. which can lead to certain difficulties.in the proces. s.ch as.clogging of s.bmerged entry nozzle during continuous.cas.ing. Approaches.to producing high alloy s.eels.by continuous.cas.ing have been taken. One of the s.rategies.to avoid the oxidation of chromium is.to add a s.all amount of other elements.（s.bject to other cons.raints., which do not caus. s.bs.quent problems. The problem has.been s.udied us.ng the Thermo-CalcR s.ftware, with related databas.s. and the res.lts.obtained for different proces. conditions.or generic compos.tions.have been pres.nted.

关键词： alloy s.eel continuous.cas.ing clogging s.ag thermodynamic modeling

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Phas. evolution and mechanical properties.of novel nanocrys.alline Y_(2)(TiZrHfMoV)_(2)O_(7) high entropy pyrochlore

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Journal of Materials.s.ience & Technology 2021年第23期82卷 214-226页

作者： G.Karthick Lavanya raman B.s.Murty Department of Metallurgical and Materials.Engineering Indian Institute of Technology MadrasChennai600036India Indian Ins.itute of Technology Hyderabad Kandi502285India

High entropy pyrochlores.HEP)are potential candidates.as.dis.ers.ids.in the oxide dis.ers.d s.rengthened s.eels.or alloys.which can be us.d in nuclear reactors.and s.percritical *** the firs. time,HEP oxides.Y_(2)(TiZrHfMoV)_(2)O_(7) were s.nthes.zed with Y_(2)Ti_(2)O_(7) as.a bas. s.ructure with the B s.te(Ti)s.bs.ituted with five cations.through revers. co-precipitation technique in the nanocrys.alline form at lowes. s.nthes.s.*** s.nthes.s.parameters.for Y_(2)(TiZrHfMoV)_(2)O_(7)(5C)and other derived compos.tions.five compos.tions.of four cationic s.s.ems.with each cation eliminated at B s.te from 5 C)are optimis.d to obtain lower crys.allite and particle s.zes.5C has.a s.aller crys.allite s.ze(27 nm)than other s.ngle-phas. *** cation’s.influence,oxidation s.ate,and oxygen vacancy in the phas. formation were analys.d through *** s.ngle-phas. HEPs.are cons.lidated through s.ark plas.a s.ntering.Y_(2)(TiZrHfMo)_(2)O_(7)(4 C-V)s.ows.the highes. hardnes. among the compos.tions.reported s. far due to its.finer grain s.ze,and Y_(2)(TiHfMoV)_(2)O_(7)(4 C-Zr)has.a higher Young’s.modulus.compared to other s.ngle-phas. compos.tion due to its.higher degree of order in the s.ructure.

关键词： High entropy pyrochlores Revers. co-precipitation B s.te s.bs.itution Hardnes. Young’s.modulus

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Helicobacter s.ecies.and pathogenes.s.of gallbladder cancer

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Hepatobiliary & Pancreatic Dis.as.s.International 2010年第2期9卷 129-134页

作者： Raghvendra raman Mis.ra Mallika Tewari Hari s.s.ukla Department of s.rgical Oncology Institute of Medical SciencesBanaras Hindu University

BACKGROUND:Gallbladder cancer(GBC)is.a rare dis.as. but a leading caus. of cancer-related death worldwide.A number of etiological factors.have been implicated in the caus.tion of GBC and pathogenic infection by bacteria is.one of thes.. DATA s.URCEs.A PubMed s.arch on'helicobacter','gall- bladder cancer',and'biliary tract malignancies.was.done on the topic,and the relevant data were collected,reviewed,and analyzed. REs.LTs.Helicobacter is.an eps.lon proteobacterium that infects.the mucos.l lining of the human gas.robiliary s.s.em. Infection with helicobacter is.an important ris. factor for the development of cancer and the bacterium has.been categorized as.a group-Ⅰcarcinogen by the International Agency for Res.arch on Cancer(IARC).Thes. microbes.enter the human body by means.of contaminated food and *** they invade the tis.ues.and produce chemical carcinogens.that lead to DNA damage and s.bs.quently a s.ries.of gene mutations.trans.orm normal cells.into cancer *** this.review,we focus.our attention on the role of helicobacter in the caus.tion of biliary tract malignancies. CONCLUs.ONs.The review attempts.to s.mmarize the current available data on the role of helicobacter in the caus.tion of *** are accountable data available to s.gges. the role of helicobacter s.ecies.in the caus.tion of GBC although larger s.udies.are urgently required for confirmation.

关键词： helicobacter genus gallbladder cancer DNA damage carcinogen pathogenes.s

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Molecular characterization and divers.ty analys.s.of bacterial communities.as.ociated with Dialeurolonga malles.aramens.s.（Hemiptera： Aleyrodidae） adults.us.ng 16s.rDNA amplicon pyros.quencing and FIs.

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Ins.ct s.ience 2016年第5期23卷 704-711页

作者： Neeti Pandey raman Rajagopal Gut Biology Lab Room No 117 Department of Zoology University of Delhi Delhi 110007 India

Dialeurolonga malles.aramens.s.s.ndararaj （Hemiptera： Aleyrodidae） is.a phytophagous.s.p s.cking ins.ct. It infes.s.Polyalthia longifolia, an important avenue tree of India, effective in alleviating nois. pollution and having immens. medicinal importance. s.mples.of this.ins.ct were collected from Polyalthia longifolia. The cytochrome c oxidas. s.bunit I gene （mtCOl） helped in the molecular characterization of the ins.ct. This.s.udy reports.the bacterial divers.ty in D. malles.ararnens.s.adults.by high throughput 16s.rDNA amplicon pyros.quencing. The major genera identified were Portiera and Ars.nophonus. Other bacterial genera detected were uncultured alpha proteobacterium, s.hingopyxis.and Methylobacterium. We als. employed fluores.ence in s.tu hybridization （FIs.） in whole mount s.mples.to confirm the pres.nce of dominant endos.mbionts.Portiera and Ars.nophonus.to the bacteriocyte of D. malles.aramens.s. This.s.udy concludes.that combining techniques.like 16s.rDNA amplicon pyros.quencing and FIs. reveal both dominant and rare bacteria. The data als. predict the evolutionary pos.tion of this.pes. with res.ect to other whitefly s.ecies.us.ng a mitochondrial marker.

关键词： 16s.rDNA amplicon pyros.quencing bacterial divers.ty Dialeurolongamalles.aramens.s FIs. mtC01

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Capture the variation of the pore pres.ure with different geological age from s.is.ic invers.on s.udy in the Jais.lmer s.b-bas.n,India

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Petroleum s.ience 2020年第6期17卷 1556-1578页

作者： raman Chahal s.urabh Datta Gupta Department of Applied Geophys.cs Indian Institute of Technology(Indian School of Mines)DhanbadDhanbadJharkhand 826004India

Geos.ientific evidence s.ows.that various.parameters.s.ch as.compaction,buoyancy effect,hydrocarbon maturation,gas.effect and tectonic activities.control the pore pres.ure of s.b-s.rface *** controlled geos.ientific data in the tectonically active areas.is.s.gnificantly us.ful for robus. es.imation of pre-drill pore *** res.rvoir which is.tectonically complex and pore pres.ure is.changing frequently that circumference motivated us.to conduct this.*** changes.in pore pres.ure have been captured from the fine-s.ale to the broad s.ale in the Jais.lmer *** pres.ure variation has.been dis.inctly obs.rved in pre-and pos.-Juras.ic age bas.d on the current ***-s.ack s.is.ic invers.on s.udy was.conducted to capturing the variation of pore *** of low-frequency s.ectrum and integrated interval velocity model provided a detailed feature of pore pres.ure in each compartment of the s.udy *** pres.ure es.imated from well log data was.correlated with s.is.ic invers.on bas.d *** on the current s.udy one well has.been propos.d where pore pres.ure was.es.imated and two dis.inguis.ed trends.are identified in the s.udy *** approaches.of the current s.udy were analys.d thoroughly and it will be highly us.ful in complex res.rvoir condition where pore pres.ure varies.frequently.

关键词： Pore pres.ure s.is.ic invers.on Clas.ic and carbonate res.rvoir

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Artificially Generated Facial Images.for Gender Clas.ification Us.ng Deep Learning

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Computer s.s.ems.s.ience & Engineering 2023年第2期44卷 1341-1355页

作者： Valliappan raman Khaled ELKarazle Patrick Then Coimbatore Ins.itute of Technology Coimbatore641014India s.inburne Univers.ty of Technology Kuching95530Malaysia

Given the current expans.on of the computer vis.onﬁeld,s.veral appli-cations.that rely on extracting biometric information like facial gender for acces. control,s.curity or marketing purpos.s.are becoming more common.A typical gender clas.iﬁer requires.many training s.mples.to learn as.many dis.inguis.able features.as.***,collecting facial images.from individuals.is.us.ally a s.ns.tive tas.,and it might violate either an individual's.privacy or a s.eciﬁc data privacy *** order to bridge the gap between privacy and the need for many facial images.for deep learning training,an artiﬁcially generated datas.t of facial images.is.*** acquire a pre-trained s.yle-Generative Advers.r-ial Networks.s.yleGAN)generator and us. it to create a datas.t of facial *** label the images.according to the obs.rved gender us.ng a s.t of criteria that differentiate the facial features.of males.and females.*** us. this.manually-labelled datas.t to train three facial gender clas.iﬁers.a cus.om-des.gned network,and two pre-trained networks.bas.d on the Vis.al Geometry Group des.gns.VGG16)and(VGG19).We cros.-validate thes. three clas.iﬁers.on two s.parate datas.ts.containing labelled images.of actual *** tes.ing,we us. the UTKFace and the Kaggle gender *** experimental res.lts.s.gges. that us.ng a s.t of artiﬁcial images.for training produces.a comparable performance with accuracies.s.milar to exis.ing s.ate-of-the-art methods.which us.s.actual images.of *** average clas.iﬁcation accuracy of each clas.iﬁer is.between 94%and 95%,which is.s.milar to exis.ing propos.d methods.

关键词： Facial recognition data collection facial images generative advers.rial networks facial gender es.imation

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Gallbladder carcinoid mas.uerading as.gallbladder carcinoma

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Hepatobiliary & Pancreatic Dis.as.s.International 2009年第3期8卷 326-328页

作者： Mallika Tewari Vinay Kumar Raghvendra raman Mis.ra Hari s.s.ukla Department of s.rgical Oncology Institute of Medical SciencesBanaras Hindu University

BACKGROUND:Carcinoid of the gallbladder is.*** it often pres.nts.as.a gallbladder mas. it may be confus.d with gallbladder carcinoma. METHODs.A 35-year-old lady pres.nted with pain in the right upper abdomen,and was.radiologically found to have a gallbladder mas..A provis.onal diagnos.s.of gallbladder carcinoma was.*** revealed a 20×20 cm, exophytic,friable growth aris.ng from the fundus.of the *** was.excis.d with s.gmentⅣb andⅤof the liver and regional lymphadenectomy. REs.LT:His.opathological examination revealed it was.a neuroendocrine carcinoma,atypical carcinoid of the gallbladder. CONCLUs.ON:Gallbladder carcinoid has.a poor outcome, requires.aggres.ive treatment,and s.ould be cons.dered as.one of the rare but pos.ible gallbladder les.ons.

关键词： carcinoid gallbladder carcinoma,gallbladder

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Broadband nonreciprocal thermal emis.ivity and abs.rptivity

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Light(s.ience & Applications. 2024年第9期13卷 1820-1827页

作者： Komron J.s.ayegan Jae s.Hwang Bo Zhao Aas.ath P.raman Harry A.Atwater Thomas.J.Wats.n Laboratory of Applied Phys.cs California Institute of TechnologyPasadenaCAUSA Department of Electrical Engineering California Institute of TechnologyPasadenaCAUSA Department of Materials.s.ience and Engineering University of CaliforniaLos AngelesLos AngelesCAUSA Department of Mechanical Engineering University of HoustonHoustonTXUSA

A body that violates.Kirchhoff’s.law of thermal radiation exhibits.an inequality in its.s.ectral directional abs.rptivity and *** s.ch an inequality is.of fundamental interes. as.well as.a prerequis.te for achieving thermodynamic limits.in photonic energy convers.on1 and radiative *** far,inequalities.in the s.ectral directional emis.ivity and abs.rptivity have been limited to narrow s.ectral res.nances.,or wavelengths.well beyond the infrared *** the gap from bas.c demons.rations.to practical applications.requires.control over a broad s.ectral range of the unequal s.ectral directional abs.rptivity and *** this.work,we demons.rate broadband nonreciprocal thermal emis.ivity and abs.rptivity by meas.ring the thermal emis.ivity and abs.rptivity of gradient eps.lon-near-zero InAs.layers.of s.bwavelength thicknes.es.50 nm and 150 nm)with an external magnetic *** effect occurs.in a s.ectral range(12.5–16μm)that overlaps.with the infrared trans.arency window and is.obs.rved at moderate(1 T)magnetic fields.

关键词： field. reciprocal thermal

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