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Reservoir heterogeneity analysis using multi-directional textural attributes from deep learning-based enhanced acoustic impedance inversion:A study from Poseidon,NW shelf Australia

Energy Geoscience

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Energy Geoscience 2024年第2期5卷 202-213页

作者： Anjali dixit Animesh Mandal Shib sankar Ganguli department of Earth Sciences Indian Institute of Technology KanpurKanpur208016India Marine and deep Seismic CSIR-NGRIHyderabad500007India

Reservoir heterogeneities play a crucial role in governing reservoir performance and ***,detailed and inter-well heterogeneity analyses are commonly performed by mapping seismic facies change in the seismic data,which is a time-intensive *** researchers have utilized a robust Grey-level co-occurrence matrix(GLCM)-based texture attributes to map reservoir ***,these attributes take seismic data as input and might not be sensitive to lateral lithology *** incorporate the lithology information,we have developed an innovative impedance-based texture approach using GLCM workflow by integrating 3d acoustic impedance volume(a rock propertybased attribute)obtained from a deep convolution network-based impedance *** proposed workflow is anticipated to be more sensitive toward mapping lateral changes than the conventional amplitude-based texture approach,wherein seismic data is used as *** evaluate the improvement,we applied the proposed workflow to the full-stack 3d seismic data from the Poseidon field,NW-shelf,*** study demonstrates that a better demarcation of reservoir gas sands with improved lateral continuity is achievable with the presented approach compared to the conventional *** addition,we assess the implication of multi-stage faulting on facies distribution for effective reservoir *** study also suggests a well-bounded potential reservoir facies distribution along the parallel fault ***,the proposed approach provides an efficient strategy by integrating the impedance information with texture attributes to improve the inference on reservoir heterogeneity,which can serve as a promising tool for identifying potential reservoir zones for both production benefits and fluid storage.

关键词： Seismic texture attributes Seismic acoustic impedance Multi-directional texture attributes Reservoir heterogeneity Reservoir characterization Poseidon field

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An international delphi consensus statement on metabolic dysfunction-associated fatty liver disease and risk of chronic kidney disease

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Hepatobiliary Surgery and Nutrition 2023年第3期12卷 386-403,I0014-I0016页

作者： dan-Qin Sun Giovanni Targher Christopher d.Byrne david C.Wheeler Vincent Wai-Sun Wong Jian-Gao Fan Herbert Tilg Wei-Jie Yuan Christoph Wanner Xin Gao Michelle T.Long Mehmet Kanbay Mindie H.Nguyen sankar d.navaneethan Yusuf Yilmaz Yuli Huang Rino A.Gani Pierluigi Marzuillo Jérôme Boursier Huijie Zhang Chan-Young Jung Jin Chai Luca Valenti George Papatheodoridis Giovanni Musso Yu-Jun Wong Mohamed El-Kassas Nahum Méndez-Sánchez Silvia Sookoian Michael Pavlides Ajay duseja Adriaan G.Holleboom Junping Shi Wah-Kheong Chan Yasser Fouad Junwei Yang Sombat Treeprasertsuk Helena Cortez-Pinto Masahide Hamaguchi Manuel Romero-Gomez Mamun Al Mahtab Ponsiano Ocama Atsushi Nakajima Chunsun dai Mohammed Eslam Lai Wei Jacob George Ming-Hua Zheng department of Nephrology Jiangnan University Medical CenterWuxiChina Affiliated Wuxi Clinical College of Nantong University WuxiChina Section of Endocrinology Diabetes and MetabolismDepartment of MedicineAzienda Ospedaliera Universitaria Integrata VeronaVeronaItaly Southampton National Institute for Health and Care Research Biomedical Research Centre University Hospital Southamptonand Southampton General HospitalUniversity of SouthamptonSouthamptonUK department of Renal Medicine University College LondonLondonUK department of Medicine and Therapeutics Chinese University of Hong KongHong KongChina Center for Fatty Liver Department of GastroenterologyXin Hua Hospital Affiliated to Shanghai Jiao Tong University School of MedicineShanghaiChina department of Internal Medicine I GastroenterologyEndocrinology&MetabolismMedical University InnsbruckInnsbruckAustria department of Nephrology Shanghai General HospitalShanghai Jiao Tong University School of MedicineShanghaiChina division of Nephrology Department of MedicineWürzburg University ClinicWürzburgGermany department of Endocrinology and Metabolism Zhongshan HospitalFudan UniversityShanghaiChina Section of Gastroenterology Boston Medical CenterBoston University School of MedicineBostonMAUSA division of Nephrology Department of Medicine(M.K.)Koc University School of MedicineIstanbulTurkey division of Gastroenterology and Hepatology Department of MedicineStanford University Medical CenterPalo AltoCAUSA department of Epidemiology and Population Health Stanford University Medical CenterPalo AltoCAUSA Section of Nephrology and Institute of Clinical and Translational Research Baylor College of Medicineand Michael E.DeBakey VA Medical CenterHoustonTXUSA department of Gastroenterology School of MedicineMarmara UniversityIstanbulTurkey department of Gastroenterology School of MedicineRecep Tayyip Erdoğan UniversityRizeTurkey department of Cardiology Shunde HospitalSouthern Medical UniversityFoshanChina division of Hepat

Background:With the rising global prevalence of fatty liver disease related to metabolic dysfunction,the association of this common liver condition with chronic kidney disease(CKd)has become increasingly *** 2020,the more inclusive term metabolic dysfunction-associated fatty liver disease(MAFLd)was proposed to replace the term non-alcoholic fatty liver disease(NAFLd).The observed association between MAFLd and CKd and our understanding that CKd can be a consequence of underlying metabolic dysfunction support the notion that individuals with MAFLd are at higher risk of having and developing CKd compared with those without ***,to date,there is no appropriate guidance on CKd in individuals with ***,there has been little attention paid to the link between MAFLd and CKd in the Nephrology *** and Results:Using a delphi-based approach,a multidisciplinary panel of 50 international experts from 26 countries reached a consensus on some of the open research questions regarding the link between MAFLd and ***:This delphi-based consensus statement provided guidance on the epidemiology,mechanisms,management and treatment of MAFLd and CKd,as well as the relationship between the severity of MAFLd and risk of CKd,which establish a framework for the early prevention and management of these two common and interconnected diseases.

关键词： Metabolic dysfunction-associated fatty liver disease(MAFLd) non-alcoholic fatty liver disease(NAFLd) chronic kidney disease(CKd) consensus

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One-step fabrication of ultrathin layered 1T@2H phase MoS2 with high catalytic activity based counter electrode for photovoltaic devices

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Journal of Materials Science & Technology 2020年第16期47卷 94-101页

作者： K.Silambarasan J.Archana S.Harish M.navaneethan R.sankar Ganesh S.Ponnusamy C.Muthamizhchelvan K.Hara Functional Materials and Energy devices Laboratory Department of Physics and NanotechnologySRM Institute of Science and TechnologyKattankulathur603203India Nanotechnology Research Center(NRC) Faculty of Engineering and TechnologySRM Institute of Science and TechnologyKattankulathur603203India Research Institute of Electronics Shizuoka University3-5-1 JohokuNaka-KuHamamatsuShizuoka432-8011Japan Graduate School of Science and Technology Shizuoka University3-5-1 JohokuNaka-KuHamamatsuShizuoka432-8011Japan

The metallic phase of molybdenum disulfide(M-MoS2)and semiconductor phase of molybdenum disulfide(S-MoS2)was synthesized by hydrothermal method,using cetyltrimethylammonium bromide(CTAB)as a *** structural and elemental composition confirmed the formation of M-MoS2 and *** the morphological analysis layered nanosheets with an inter-layered distance of 0.62 nm for M-MoS2 and 0.95 nm for S-MoS2 was ***-transform infrared(FT-IR)spectral analysis was used to investigate the existence of CTAB functional *** peak at 885 cm-1 attributed to the CH3 bond which confirmed the presence of CTAB in the *** anodic and cathodic peak separation(Epp)values of the counter electrode(CE)has showed at 468.28 mV(M-MoS2)and 540.87 mV(S-MoS2).The M-MoS2 thin film shows higher catalytic activity when compared to S-MoS2 due to more active sites and electronic *** power conversion efficiency of M-MoS2 CE based device exhibits higher efficiency compared to S-MoS2 CE based device.

关键词： M-MoS2 S-MoS2 Layered nanosheet Catalytic Power conversion

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Perturbation analysis for pulsatile flow of Carreau fluid through tapered stenotic arteries

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International Journal of Biomathematics 2016年第4期9卷 259-283页

作者： d. S. sankar Engineering Mathematics UnitFaculty of Engineering Universiti Teknologi Brunei Gadong BEI~IO Brunei Darussalam

The pulsatile flow of blood in a tapered narrow artery with overlapping time-dependent stenosis is mathematically analyzed, modeling blood as Caxreau fluid. Perturbation method is employed for solving the resulting nonlinear system of equations along with the appropriate boundary conditions. The analytic solutions to the pressure gradient, velocity distribution, flow rate, wall shear stress and longitudinal impedance to flow axe obtained in the asymptotic form. The variation of the aforesaid flow quantities with respect to various physical parameters such as maximum depth of the stenosis, angle of tapering of the artery, power law index, Reynolds number, pulsatile amplitude of the flow and Weissenberg number is investigated. It is found that the wall shear stress and longitudinal impedance to flow increase with the increase of the angle of tapering of the artery, the maximum depth of the stenosis and pulsatile Reynolds number and these decrease with the increase of the amplitude of the flow, power law index and Weis- senberg number. The mean velocity of blood decreases significantly with the increase of the artery radius, maximum depth of the stenosis, angle of tapering of the artery.

关键词： Pulsatile flow Carreau fluid overlapping stenosis mean velocity longitudinalimpedance to flow.

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Three-mode optomechanical system for angular velocity detection

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Chinese Physics B 2018年第8期27卷 254-260页

作者： Kai Li sankar davuluri Yong Li Beijing Computational Science Research Center Beijing 100193China

We propose a scheme for measuring the angular velocity of absolute rotation using a three-mode optomechanical system in which one mode of the two-dimensional （2d） mechanical resonator is coupled to an optical cavity. When the total system rotates, the Coriolis force acting on the 2d mechanical resonator due to the absolute rotation will affect the mechanical motion and thus change the phase of the output field from the cavity. The angular velocity of the absolute rotation can be estimated by monitoring the spectrum of the output field from the cavity via homodyne measurement. The minimum measurable angular velocity, which is determined by the noise spectrum, is calculated. The working range of the gyroscope for measuring angular velocity is discussed.

关键词： optomechanics gyroscope

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Improving optomechanical gyroscopes by coherent quantum noise cancellation processing

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Science China(Physics,Mechanics & Astronomy) 2018年第9期61卷 19-25页

作者： Kai Li sankar davuluri Yong Li Beijing Computational Science Research Center Beijing 100193 China Synergetic Innovation Center for Quantum Effects and Applications Hunan Normal University Changsha 410081 China

Coherent quantum noise cancellation(CQNC) method is used to beat standard quantum limit(SQL) for improving the performance of quantum optomechanical gyroscopes. The protocol for realizing CQNC is achieved by constructing an effective negative mass mechanical oscillator, which is simulated by an ancillary cavity. This oscillator shows an antiresponse relative to that of a real mechanical oscillator. Thus, the optomechanical back-action noise is counteracted or restrained, and we could increase our signal by increasing the coupling strength without increasing the noise.

关键词： CQNC optomechanics gyroscope

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Combinatorial effect of diclofenac with piperine and d-limonene on inducing apoptosis and cell cycle arrest of breast cancer cells

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Asian Pacific Journal of Tropical Biomedicine 2023年第2期13卷 80-92页

作者： Srivarshini sankar Gothandam Kodiveri Muthukaliannan School of Bio Sciences and Technology Vellore Institute of TechnologyVelloreTamil NaduIndia

Objective:To investigate the potential synergistic activity of diclofenac with piperine and d-limonene in inducing apoptosis and cell cycle arrest in breast cancer MCF-7 ***:Molecular docking study was conducted to evaluate the binding affinity of diclofenac with piperine and d-limonene against p53,Bax,and *** MTT assay was used to determine IC50,and the Chou-Talay method was used to determine the synergistic concentration of the combination treatment of diclofenac plus piperine and diclofenac plus *** detection,cell cycle arrest,reactive oxygen species production,and mitochondrial membrane potential were also ***:diclofenac,piperine,and d-limonene showed potent binding affinity for p53,Bax,and *** plus piperine and diclofenac plus d-limonene enhanced the formation of reactive oxygen species,which also had an effect on the mitochondrial membrane’s integrity and caused dNA *** plus piperine and diclofenac plus d-limonene arrested the cells in the sub-G0phase while drastically lowering the percentage of cells in the G2/M ***,the elevated apoptosis in the combined therapy was confirmed by annexin V/propidium iodide ***:The combined therapy prominently enhanced the antiproliferative and apoptotic effects on MCF-7 cells compared with treatment with diclofenac,piperine,and d-limonene alone.

关键词： Breast cancer diclofenac sodium Piperine d-limonene Reactive oxygen species Cell cycle arrest Apoptosis

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Alpha-tocopherol supplementation on chromium toxicity: a study on rat liver and kidney cell membrane

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Journal of Environmental Sciences 2003年第3期15卷 356-359页

作者： sankar Kumar dey Prasunpriya Nayak Somenath Roy department of Human Physiology with Community Health Vidyasagar UniversityDepartment of Human Physiology with Community Health Vidyasagar UniversityDepartment of Human Physiology with Community Health Vidyasagar University Midnapore-721 102 West Bengal IndiaMidnapore-721 102 West Bengal IndiaMidnapore-721 102 West Bengal India

Membrane damage is one of the important consequence of chromium, an environmental toxicant, to produce cytotoxicity. α-tocopherol, a membrane protectant can be used to reduce the chromium-induced membrane damage. In the present study, the impact of chromium in presence and absence of α-tocopherol was studied on plasma membrane of liver and kidney in male Wistar rats (80—100 g body weight). Significant increase in membrane cholesterol level as well as significant decrease in membrane phospholipid level in chromium exposed ( 0.8 mg /100 g body weight/d, i.p., for 4 weeks) animals suggest structural alteration of both liver and kidney plasma memebrane. The alkaline phosphatase, total ATPase and Na +-K +-ATPase activities of plasma membrane were significantly decreased in both liver and kidney after chromium treatment. However, α-tocopherol (30 mg/100 g diet) supplementation can restrict the changes in these membrane-bound enzyme activities. Thus, the usefulness of dietary supplementation of α-tocopherol to restrain the chromium-induced membrane damage is suggested.

关键词： chromium liver kidney membrane α-tocopherol

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Radical-mediated hydroalkylation of 2-vinylpyrrolidine derivatives: a versatile entry into indolizidine alkaloids

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Science China Chemistry 2019年第11期62卷 1504-1506页

作者： sankar Rao Suravarapu Bettina Peter Philippe Renaud department of Chemistry and Biochemistry University of Bern

A concise route for the preparation of two simple optically pure indolizidin-5-ones has been *** key chain elongation process was achieved using a triethylborane/catechol mediated hydroalkylation of Boc-protected *** using complementary strategies,these two bicyclic lactams can be alkylated with complete control of the stereochemistry at C(5)and their conversion to a variety of indolizidine alkaloids such as coniceine,indolizidine 209d and 167B,5-epi-indolizidine 249A and monomorine has been reported in the literature.

关键词： alkenes carbohydrogenation radical reaction catechol triethylborane α-iodoesters allylamine

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Search for periodicities of the solar irradiance data from the Earth Radiation Budget Satellite (ERBS) using the periodogram method

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Research in Astronomy and Astrophysics 2010年第4期10卷 348-354页

作者： sankar Narayan Patra Gautam Bhattacharya Koushik Ghosh department of Applied Electronics and Instrumentation Engineering University Institute of Technologythe University of Burdwan department of Physics University Institute of Technologythe University of Burdwan department of Mathematics University Institute of Technologythe University of Burdwan

We have analyzed the solar irradiance data from the Earth Radiation Budget Satellite （ERBS） during the time period from 1984 October 15 to 2003 October *** first filtering the data by Simple Exponential Smoothing,we have applied the periodogram method to the processed data in order to search for its time *** study exhibits multi-periodicities on these data around 110,118,574 and 740d with very high confidence levels （more than 99%）.These periods are significantly similar to the periods of other solar activities which may suggest that solar irradiance may be associated with other solar activities.

关键词： Sun:activity - Sun:fundamental parameters

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