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Improved reservoir characterization by means of supervised machine learning and model-based seismic impedance inversion in the Penobscot field,Scotian Basin

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Energy Geoscience

Energy Geoscience 2024年第2期5卷 183-201页

作者： Satya Narayan Soumyashree Debasis Sahoo soumitra Kar Sanjit Kumar Pal Subhra Kangsabanik Oil and Natural Gas Corporation(ONGC)Limited DehradunIndia Department of Applied Geophysics IIT(ISM)DhanbadIndia

The present research work attempted to delineate and characterize the reservoir facies from the Dawson Canyon Formation in the Penobscot field,Scotian *** integrated study of instantaneous frequency,P-impedance,volume of clay and neutron-porosity attributes,and structural framework was done to unravel the Late Cretaceous depositional system and reservoir facies distribution patterns within the study *** strikes were found in the EW and NEE-SWW directions indicating the dominant course of tectonic activities during the Late Cretaceous period in the region.P-impedance was estimated using model-based seismic *** properties such as the neutron porosity(NPHI)and volume of clay(VCL)were estimated using the multilayer perceptron neural network with high ***,a combination of low instantaneous frequency(15-30 Hz),moderate to high impedance(7000-9500 gm/cc*m/s),low neutron porosity(27%-40%)and low volume of clay(40%-60%),suggests fair-to-good sandstone development in the Dawson Canyon *** calibration with the welllog data,it is found that further lowering in these attribute responses signifies the clean sandstone facies possibly containing *** present study suggests that the shale lithofacies dominates the Late Cretaceous deposition(Dawson Canyon Formation)in the Penobscot field,Scotian *** faults and overlying shale facies provide structural and stratigraphic seals and act as a suitable hydrocarbon entrapment mechanism in the Dawson Canyon Formation's *** present research advocates the integrated analysis of multi-attributes estimated using different methods to minimize the risk involved in hydrocarbon exploration.

关键词： Reservoir characterization Model-based inversion Multilayer perceptron(MLP) Impedance Petrophysical properties Scotian Basin

Review of current progress in hole-transporting materials for perovskite solar cells

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Journal of Energy Chemistry 2022年第5期31卷 330-386页

作者： Prerna Mahajan Bhavya Padha Sonali Verma Vinay Gupta Ram Datt Wing Chung Tsoi soumitra Satapathi Sandeep Arya Department of Physics University of JammuJammuJammu and Kashmir 180006India Department of Physics Khalifa University of Science and TechnologyAbu Dhabi 127788United Arab Emirates SPECIFIC College of EngineeringSwansea University Bay CampusFabian WaySA18ENSwanseaUnited Kingdom Department of Physics Indian Institute of Technology RoorkeeUttarakhand 247667India

Recent advancements in perovskites’ application as a solar energy harvester have been astonishing. The power conversion efficiency(PCE) of perovskite solar cells(PSCs) is currently reaching parity(>25 percent), an accomplishment attained over past decades. PSCs are seen as perovskites sandwiched between an electron transporting material(ETM) and a hole transporting material(HTM). As a primary component of PSCs, HTM has been shown to have a considerable effect on solar energy harvesting, carrier extraction and transport, crystallization of perovskite, stability, and price. In PSCs, it is still necessary to use a *** perovskites are capable of conducting holes, they are present in trace amounts, necessitating the use of an HTM layer for efficient charge extraction. In this review, we provide an understanding of the significant forms of HTM accessible(inorganic, polymeric and small molecule-based HTMs), to motivate further research and development of such materials. The identification of additional criteria suggests a significant challenge to high stability and affordability in PSC.

关键词： Hole transporting material Perovskite solar cells Power conversion efficiency Stability

Is machine learning redefining the perovskite solar cells?

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Journal of Energy Chemistry 2022年第3期31卷 74-90,I0004页

作者： Nishi Parikh Meera Karamta Neha Yadav Mohammad Mahdi Tavakoli Daniel Prochowicz Seckin Akin Abul Kalam soumitra Satapathi Pankaj Yadav Department of Science School of TechnologyPandit Deendayal Energy UniversityGandhinagar 382007GujaratIndia Department of Electrical Engineering School of TechnologyPandit Deendayal Energy UniversityGandhinagar 382007GujaratIndia Department of Telecommunication Ministry of CommunicationMumbai LSAMumbai 400072MaharashtraIndia Department of Electrical Engineering and Computer Science Massachusetts Institute of TechnologyCambridgeMA 02139USA Institute of Physical Chemistry Polish Academy of SciencesKasprzaka 44/5201-224 WarsawPoland Department of Metallurgical and Materials Engineering Karamanoglu Mehmetbey University70200 KaramanTurkey Department of Chemistry Faculty of ScienceKing Khalid UniversityAbha 61413P.O.Box 9004Saudi Arabia Department of Physics Indian Institute of Technology RoorkeeRoorkeeHaridwarUttarakhand 247667India Department of Solar Energy School of TechnologyPandit Deendayal Energy UniversityGandhinagar 382007GujaratIndia

Development of novel materials with desirable properties remains at the forefront of modern scientific *** learning(ML),a branch of artificial intelligence,has recently emerged as a powerful technology in optoelectronic devices for the prediction of various properties and rational design of *** halide perovskites(MHPs)have been at the centre of attraction owing to their outstanding photophysical properties and rapid development in solar cell ***,the application of ML in the field of MHPs is also getting much attention to optimize the fabrication process and reduce the cost of ***,we comprehensively reviewed different applications of ML in the designing of both MHP absorber layers as well as complete perovskite solar cells(PSCs).At the end,the challenges of ML along with the possible future direction of research are *** believe that this review becomes an indispensable roadmap for optimizing materials composition and predicting design strategies in the field of perovskite technology in the future.

关键词： Machine learning Metal halide perovskites Perovskite solar cell Lead free perovskites

Posterior Fossa Arachnoid Cyst Presenting as Negative Symptoms of Psychosis

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上海精神医学 2018年第3期30卷 202-203页

作者： soumitra DAS Department of Psychiatry NIMHANS

Arachnoid cysts are benign congenital malformations,making up 1% among all the space occupying lesions(SOL).^([1,2])Sylvain fissure is the most common place(50%)but it can happen in any place.^([2])Patients might complain of a headache,ataxia,seizures,dizziness,and visual changes *** common psychiatric symptoms are psychosis,alexithymia,attention deficit and hyperactivity disorder,paranoid delusions,obsessive religiosity,sense of guilt or ruin,hallucinations,

关键词：精神病症状包囊网状否定盒子欺骗

Effect of arc-current and spray distance on elastic modulus and fracture toughness of plasma-sprayed chromium oxide coatings

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Friction 2018年第4期6卷 387-394页

作者： Simanchal KAR Partha Pratim BANDYOPADHYAY soumitra PAUL Department of Mechanical Engineering Indian Institute of Technology Kharagpur

In this experimental study, chromium oxide powder was sprayed on a low-carbon steel substrate using the atmospheric plasma spray process. The current and standoff distances(SODs) were varied to study their effect on the fracture toughness of the coatings. Theoretically, as the arc current increases, the melting of the ceramic oxide should increase and this in turn should lead to the formation of a dense coating. However,it was observed that if the arc power is too high and because the particle size of the powder is small(approximately 30 μm), the particles tend to fly away from the plasma core. Similarly, an appropriate SOD should provide the particles with more melting time, thus resulting in a dense coating. On the other hand, a larger SOD leads to the solidification of the molten particles before the droplets can reach the substrate. All these effects may lead to substantial variation in the fracture toughness of the coating. The present paper attempts to correlate the plasma spraying parameters and microstructure of the coating with the fracture toughness and other primary coating properties.

关键词：等离子喷涂工艺陶瓷氧化物生产工艺发展现状

Retrograde nerve growth factor signaling abnormalities and the pathogenesis of familial dysautonomia

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Neural Regeneration Research 2021年第9期16卷 1795-1796页

作者： soumitra Ghosh Lin Li Warren G.Tourtellotte Department of Pathology and Laboratory Medicine Cedars-Sinai Medical CenterLos AngelesCAUSA Department of Neurology Department of NeurosurgeryDepartment of Biomedical SciencesCedars-Sinai Medical CenterLos AngelesCAUSA

Familial dysautonomia(FD,OMIM 223900;also known as HSAN III or Riley-Day syndrome) is the most prevalent form of hereditary sensory and autonomic neuropathy(HSAN;Axelrod et al., 1974). Patients suffering from autonomic and sensory nervous system impairment have no available effective treatment and the average age of death is approximately 24 years.

关键词： al. pathogenesis impairment

Probing and understanding interaction of Eu(Ⅲ)withγ-alumina in presenceof malonic acid

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Journal of Environmental Sciences 2021年第2期33卷 181-192页

作者： Madhuri A Patel Aishwarya soumitra Kar Vaibhavi V Raut B.S.Tomar Radioanalytical Chemistry Division Bhabha Atomic Research CentreMuambai 400085India Homi Bhabha National institute AnushaktinagarMumbai 400094India

Radionuclide migration in aquatic environment is influenced by its sorption onto colloids/mineral oxides and the presence of organic complexing *** a view to understand the sorption of trivalent actinides by mineral oxides in presence of organic acid,in the present study,Eu(Ⅲ),malonic acid(MA)andγ-alumina are considered as representatives of trivalent actinides,low molecular weight natural occurring organic acid and aluminol sites,*** influence of MA on sorption of Eu(Ⅲ)byγ-alumina was elucidated by batch sorption,spectroscopic techniques and surface complexation modeling,for the first *** Total Reflection-Fourier Transform Infrared spectroscopic studies of MA sorbed onγ-alumina revealed the presence of two inner-sphere surface *** sorption for binary(alumina-Eu(Ⅲ))and ternary(alumina-Eu(Ⅲ)-MA)systems were investigated as a function of p H,Eu(Ⅲ)concentration and sequential addition of Eu(Ⅲ)/*** p H edge for Eu(Ⅲ)sorption shifts to higher p H with increasing Eu(Ⅲ)*** ternary systems,Eu(Ⅲ)sorption is significantly enhanced at p H<***(Ⅲ)speciation onγ-alumina is independent of addition sequence of Eu(Ⅲ)/*** resolved fluorescence spectroscopy of Eu(Ⅲ)sorbed onγ-alumina exhibited two surface species,≡XOEu^2+and(≡YO)2 Eu^(+).The enhancement in I 616/I 592 and lifetime for ternary systems,as compared to binary system,at low p H,indicates the participation of Eu-MA complexes in the formation of surface species in ternary *** diffuse layer model has been employed to successfully model the experimental sorption profiles of binary and ternary systems,using code FITEQL 4.0,by considering the surface species identified by spectroscopic techniques.

关键词： Malonic acid Eu(Ⅲ) γ-alumina Sorption ATR-FTIR TRFS Surface complexation modeling

In vitro screening of probiotic properties of Lactobacillus plantarum isolated from fermented milk product

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Food Quality and Safety 2020年第4期4卷 213-223页

作者： soumitra Nath Jibalok Sikidar Monisha Roy Bibhas Deb Department of Biotechnology Gurucharan CollegeSilcharIndia Institutional Biotech Hub Gurucharan CollegeSilcharIndia

Objectives:The screening of traditional fermented products is essential for the assessment of safety,security,and further development of functional foods for the well-being of human *** aim of the present study was to isolate and identify bacteria from fermented raw milk samples that exhibit health benefits upon ***:In order to confirm the isolates as probiotics,several in vitro assays were conducted to assess the probiotic properties of isolated *** initial screening includes tolerance to acid,bile,pancreatin,and *** cell surface properties demonstrate their interaction with mucosal epithelium,which includes hydrophobicity and auto-aggregation *** assessment was done by performing haemolytic test and antibiotic susceptibility *** antagonistic activity of probiotic strain was further evaluated against some pathogenic ***:Lactobacillus plantarum(***)isolated from fermented raw milk was preliminarily identified by biochemical tests and further confirmed using 16S rRNA *** isolate designated as *** strain GCC_19M1 demonstrated significant tolerance to low pH,0.3%bile,0.5%pancreatin,and 5%*** the presence of simulated gastric juice(at pH 3),the isolate exhibited a survival rate of 93.48-96.97%.Furthermore,the development of ecological niches in the human gut and their successful accumulation have been revealed by auto-aggregation and hydrophobicity *** of haemolytic activity ensures the non-virulent nature of the *** plantarum strain GCC_19M1 showed susceptibility towards gentamicin,tetracycline,kanamycin,meropenem,and ceftriaxone and exhibited an antagonistic effect on pathogenic ***:The obtained results conveyed that *** strain GCC_19M1 has strong probiotic potential,and its presence in the fermented raw milk products may serve as a potent functional probiotic food.

关键词： raw milk probiotic Lactobacillus plantarum gastric juice auto-aggregation hydrophobicity

Psychosis as an indicator of recurrent non-Hodgkin's lymphoma:a rare presentation

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General Psychiatry 2018年第4期31卷 45-47页

作者： Mustafa Ali soumitra Das Department of Psychiatry National Institute of Mental Health and Neurosciences

Psychotic manifestations of brain tumours are rare but described in the literature mostly along with other neurological deficits. Memory loss, difficulty in attention and concentration, depression, anxiety, and mood symptoms are commonly described in brain tumours. A schizophrenia-like picture without a deficit in motor or sensory function may land the clinician into a diagnostic dilemma. Primary central nervous system lymphoma(PCNSL) is a highly malignant disease with high mortality and needs immediate attention. Our case which had a unique recurrence in the postoperative period with psychotic symptoms can be an eye-opener to be more vigilant about underlying clinical extension.

关键词： PCNSL