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印度Cambay盆地Gandhar油田的CO2封存可行性评估（英文）

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Journal of Marine Science and Application 2024年第3期23卷 529-543页

作者： Vikram vishal Somali Roy Yashvardhan Verma Bharath Shekar Department of Earth Sciences Indian Institute of Technology Bombay National Centre of Excellence in Carbon Capture and Utilization Indian Institute of Technology Bombay

Our research is centered on the Gandhar oil field, which was discovered in 1983, where daily oil production has declined significantly over the years. The primary objective was to evaluate the feasibility of carbon dioxide（CO2） storage through its injection into the siliciclastic reservoirs of Ankleshwar Formation. We aimed to obtain high-resolution acoustic impedance data to estimate porosity employing model-based poststack seismic inversion. We conducted an analysis of the density and effective porosity in the target zone through geostatistical techniques and probabilistic neural networks. Simultaneously, the work also involved geomechanical analysis through the computation of pore pressure and fracture gradient using well-log data, geological information, and drilling events in the Gandhar field. Our investigation unveiled spatial variations in effective porosity within the Hazad Member of the Ankleshwar Formation, with an effective porosity exceeding 25% observed in several areas, which indicates the presence of well-connected pore spaces conducive to efficient CO2migration. Geomechanical analysis showed that the vertical stress（Sv） ranged from 55 MPa to 57 MPa in Telwa and from 63.7 MPa to 67.7 MPa in Hazad Member. The pore pressure profile displayed variations along the stratigraphic sequence, with the shale zone, particularly in the Kanwa Formation, attaining the maximum pressure gradient（approximately 36 MPa）. However, consistently low pore pressure values（30-34 MPa） considerably below the fracture gradient curves were observed in Hazad Member due to depletion. The results from our analysis provide valuable insights into shaping future field development strategies and exploration of the feasibility of CO2sequestration in Gandhar Field.

关键词： Carbon capture and storage Reservoir characterization Seismic inversion Geomechanics CO2 storage CO2 enhancing oil recovery NEURAL-NETWORK ATTRIBUTES

The Bright Single Pulse Emission from PSR B1133+16

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Research in Astronomy and Astrophysics 2024年第4期24卷 253-261页

作者： Jun Tan Zhi-Gang Wen Zhen Wang Xue-Feng Duan Hong-Guang Wang Na Wang vishal Gajjar Jian-Ping Yuan Rai Yuen Wen-Ming Yan Jian-Ling Chen Wei Han Hui Wang Cheng-Bing Lyu Ai-Jun Dong Maths and Information Technology School Yuncheng UniversityYuncheng 044000China Xinjiang Astronomical Observatory Chinese Academy of SciencesUrumqi 830011China Xinjiang Key Laboratory of Radio Astrophysics Urumqi 830011China School of Physics and Materials Science Guangzhou UniversityGuangzhou 510006China Space Science Laboratory University of CaliforniaBerkeley 94710USA Department of Physics and Electronic Engineering Yuncheng UniversityYuncheng 044000China School of Physics and Electronic Science Guizhou Normal UniversityGuiyang 550025China

We have conducted a comprehensive investigation into the bright single pulse emission from PSR B1133+16using the Giant Metrewave Radio *** time resolution data(61μs)were obtained at a center frequency of 322 MHz with a bandwidth of 32 MHz over a continuous observation period of 7.45 hr.A total of 1082 bright pulses were sporadically detected with peak flux densities ranging from 10 to 23 times stronger than the average pulse ***,no giant pulse-like emission with a relative pulse energy larger than 10 and extremely short duration was detected,indicating that these bright pulses cannot be categorized as giant pulse *** majority of these bright pulses are concentrated in pulse phases at both the leading and trailing windows of the average pulse profile,with an occurrence ratio of approximately *** pulse energy distribution for all individual pulses can be described by a combination of two Gaussian components and a cutoff power-law with an index of α=-*** updated nulling fraction of 15.35%±0.45% was determined from the energy *** emission of individual pulses follows a log-normal distribution in peak flux density *** is imperative that regular phase drifting in bright pulse sequence is identified in both the leading and trailing components for the first *** physical mechanisms are discussed in detail to provide insights into these observations.

关键词： (stars:)pulsars:general (stars:)pulsars:individual(PSR B1133+16) methods:observational methods:data analysis

Hindi translation and validation of the English version of the gastrointestinal symptom rating scale questionnaire:An observational study

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World Journal of Gastrointestinal Pharmacology and Therapeutics 2024年第5期15卷 33-39页

作者： Neha Jindal Anuraag Jena Krishan Kumar Bijaya K Padhi Rajni Sharma Vaneet Jearth Usha Dutta vishal Sharma Department of Gastroenterology Postgraduate Institute of Medical Education and Research(PGIMER)Chandigarh 160012India Department of Psychiatry Postgraduate Institute of Medical Education and Research(PGIMER)Chandigarh 160012India Department of Community Medicine and School of Public Health Postgraduate Institute of Medical Education and Research(PGIMER)Chandigarh 160012India Advanced Pediatric Centre Postgraduate Institute of Medical Education and Research(PGIMER)Chandigarh 160012India

BACKGROUND The gastrointestinal symptom rating scale(GSRS)is a questionnaire in English language which is designed to assess the clinical symptoms in patients with irritable bowel syndrome(IBS)and peptic ulcer *** validated scale has questions on around 15 items and has been validated in patients with dyspepsia and *** To translate and validate the English version of the GSRS questionnaire to the Hindi *** The purpose of the present work was to create a Hindi version of this questionnaire for use in the Indian *** process involved various steps as per the World Health Organization methodology including initial forward translation,backward translation,and assessment by an expert *** pilot testing was followed by testing in healthy and diseased *** The Hindi translation was pilot tested in 20 individuals and further validated in healthy controls(n=30,15 females)and diseased individuals(n=72,27 females).The diseased group included patients with functional dyspepsia and ***'s alpha for internal consistency on the final translated GSRS questionnaire was 0.715 which is considered *** questions significantly differentiated the diseased population from the healthy population(P value<0.05)in the translated Hindi version of the *** The translated Hindi GSRS can be used to evaluate gastrointestinal function in clinical trials and community surveys in Hindi speaking populations.

关键词： Irritable bowel syndrome Gut health Dyspepsia Symptoms Pain Constipation Diarrhoea

Long-term outcomes of titanium-nitride-oxide coated stents and drug-eluting stents in acute coronary syndrome:A systematic review and meta-analysis

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World Journal of Cardiology 2024年第5期16卷 293-305页

作者： Muhammad Ahmed Ali Fahim Afia Salman Hira Anas Khan Syed Muhammad Hasan Muskan FatimaBhojani Sarah Aslam Amna Zia Ul Haq vishal Reddy Bejugam Beena Muntaha Nasir Wajiha Gul Abdul Moeed Abdelrahman S Abdalla Muhammad Majid Muhammad Sohaib Asghar Md Al Hasibuzzaman Department of Internal Medicine Dow University of Health SciencesKarachi 74200Pakistan Department of Internal Medicine North Central Bronx HospitalBronxNY 10467United States Department of Urology Center for Academic MedicineStanford University School of MedicinePalo AltoCA 33872United States Department of Cardiovascular Imaging Cleveland ClinicClevelandOH 44195United States Division of Nephrology and Hypertension Mayo Clinic RochesterRochesterMN 55905United States Institute of Nutrition and Food Science University of DhakaDhaka 1000Bangladesh

BACKGROUND In severe cases of coronary artery disease,percutaneous coronary intervention provide promising *** stent used could be a drug-eluting stent(DES)or a titanium-nitride-oxide coated stent(TiNOS).AIM To compare the 5-year effectiveness and safety of the two stent *** The following systematic review and meta-analysis was conducted in accordance with the preferred reporting items for systematic reviews and meta-analysis guidelines,and PubMed/MEDLINE,Scopus,and Cochrane Central were searched from inception till August *** outcomes were major adverse cardiac events(MACE),cardiac death,myocardial infarction(MI),cardiac death or MI,and ischemia-driven total lesion revascularization(ID-TLR).RESULTS Four randomized controlled trials(RCT),which analyzed a sum total of 3045 patients with acute coronary syndrome(ACS)after a median follow-up time of 5 years were *** statistically insignificant,an increase in the ID-TLR was observed in patients receiving TiNOSs vs *** addition,MI,cardiac death and MI,and definite stent thrombosis(DST)were significantly decreased in the TiNOS *** analysis revealed no significant results with meta-regression presenting non-ST elevated MI(NSTEMI)as a statistically significant covariate in the outcome of *** TiNOS was found to be superior to DES in terms of MI,cardiac death or MI,and DST outcomes,however,the effect of the two stent types on ID-TLR and MACE was not significant.A greater number of studies are required to establish an accurate comparison of patient outcomes in TiNOS and DES.

关键词： Stents Drug-eluting Major adverse cardiac events All-cause death Meta-analysis

Enhanced visible-light photocatalytic activity of samarium-doped zinc oxide nanostructures

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Journal of Rare Earths 2020年第1期38卷 29-38页

作者： Sukriti Prakash Chand vishal Singh Department of Physics National Institute of TechnologyKurukshetra 136119India Centre for Materials Science&Engineering National Institute of TechnologyHamirpur 177005India

In the present work,we have synthesized samarium doped zinc oxide nanostructures(Zn1-xSmxO;x=0.00,0.02,0.04 and 0.06) via chemical precipitation method and studied their structural,morphological,optical and photocatalytic properties.X-ray diffraction(XRD) patterns,PL and Raman spectra results indicate that the undoped and Sm-doped ZnO nanostructures are crystallized in a hexagonal wurtzite *** images show that the morphology of the sample changes from cubical to hexagonal nanostructures with increase in Sm3+doping *** EDX spectra confirm the incorporation of Sm3+ion in *** influence of Sm3+doping on the structure,morphology,absorption,emission and photocatalytic activity of ZnO nanostructures were investigated *** addition of Sm3+ion leads to a red shift in the optical energy band gap from 3.19 to 2.67 eV and hence,increases the visible light absorption *** presence of E2(H) and E1(LO) modes in microRaman spectra confirms the crystallinity and defects in the *** detailed photocatalytic experiments reveal that Sm-doped ZnO nanostructures show the maximum photodegradation efficiency for Methylene blue(MB) dye for x=0.04,i,e.,94.94%,under visible light *** photocatalytic efficiency improves by 6.98 times when ZnO is doped with rare earth metal ion(Sm3+) and is a potential candidate for practical *** investigation demonstrates that as-synthesized nano-sized photocatalysts act as an efficient photocatalyst for the degradation of MB dye.

关键词： Photocatalysis Sm-doped ZnO FESEM Micro-Raman UV-Visible spectroscopy Rare earths

Post-cholecystectomy bile leak is not always synonymous with acute bile duct injury:Need for reclassification

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Hepatobiliary & Pancreatic Diseases International 2020年第5期19卷 492-494页

作者： vishal Gupta Department of Surgical Gastroenterology King George’s Medical UniversityLucknowUP 226003India

Bile leak after laparoscopic cholecystectomy remains a significant cause of postoperative *** duct stump is the most common site(~70%)of bile leak after cholecystectomy[1].Incidence of bile leak from the cystic duct stump is 0.5%−3%which is higher(4%−7%)in cases with complicated gallstone disease(*** cholecystitis)[2].Bile leak in postoperative period after cholecystectomy,manifesting as bile in intraoperatively placed drain or as an intrabdominal collection,localized or generalized,is considered a complication secondary to bile duct injury(BDI)that was sustained during the *** to the site of leak,such bile leak is classified as an iatrogenic BDI,and is subsequently categorised depending on the site of leak if that is localized on subsequent investigations.

关键词： bile cholecystectomy acute

Perspicacious Apprehension of HDTbNB Algorithm Opposed to Security Contravention

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Intelligent Automation & Soft Computing 2023年第2期35卷 2431-2447页

作者： Shyla vishal Bhatnagar NSUT East Campus(Formerly Ambedkar Institute of Advanced Communication Technologies and Research) Guru Gobind Singh Indraprastha UniversityNew Delhi110031India NSUT East Campus(Formerly Ambedkar Institute of Advanced Communication Technologies and Research) New Delhi110031India

The exponential pace of the spread of the digital world has served as one of the assisting forces to generate an enormous amount of informationﬂow-ing over the *** data will always remain under the threat of technolo-gical suffering where intruders and hackers consistently try to breach the security systems by gaining personal information *** this paper,the authors pro-posed the HDTbNB(Hybrid Decision Tree-based Naïve Bayes)algorithm toﬁnd the essential features without data scaling to maximize the model’s performance by reducing the false alarm rate and training period to reduce zero frequency with enhanced accuracy of IDS(Intrusion Detection System)and to further analyze the performance execution of distinct machine learning algorithms as Naïve Bayes,Decision Tree,K-Nearest Neighbors and Logistic Regression over KDD 99 *** performance of algorithm is evaluated by making a comparative analysis of computed parameters as accuracy,macro average,and weighted ***ﬁndings were concluded as a percentage increase in accuracy,precision,sensitiv-ity,speciﬁcity,and a decrease in misclassiﬁcation as 9.3%,6.4%,12.5%,5.2%and 81%.

关键词： Naïve bayes decision tree k-nearest neighbors logistic regression neighbors classiﬁer

Power plant selection in a carbon constrained world the TERA(technoeconomic environmental risk analysis)

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航空动力学报 2009年第4期24卷 896-902页

作者： Stephen Ogaji Pericles Pilidis vishal Sethi Department of Power and Propulsion School of Engineering Cranfield University

There is an increasing concern that current trends of consumption of natural resources cannot *** is imperative that major targeted investments are made into economical and reliable environment friendly propulsion and power *** novel and promising concepts are being *** selection of the best candidates to pursue for investment becomes a very difficult choice.A detailed TERA(techno-economic environmental risk analysis) framework is described here to quantify risks and to compare and rank competing schemes on a formal and consistent *** technique is based on detailed and rigorous thermodynamic representations of power plants.A layer of environment,economic,weather and other models to describe the appropriate local conditions is superimposed to *** outcome is a techno-economic environmental risk analysis framework with appropriate detail of each power plant as applied to the appropriate *** results for each concept can then be compared and contrasted to make appropriate selections.

关键词： TERA(techno-economic environmental risk analysis) techno-economic risk analysis gas turbine multi-disciplinary optimisation(MDO)

Effect of pulse slippage on density transition-based resonant third-harmonic generation of short-pulse laser in plasma

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Frontiers of physics 2016年第4期11卷 163-170页

作者： vishal Thakur Niti Kant Department of Physics Lovely Professional University Phagwara-144411 Punjab India

The resonant third-harmonic generation of a tion was investigated. Because of self-focusing self-focusing laser in plasma with a density transi- of the fundamental laser pulse, a transverse intensity gradient was created, which generated a plasma wave at the fundamental wave frequency. Phase matching was satisfied by using a Wiggler magnetic field, which provided additional angular too- mentum to the third-harmonic photon to make the process resonant. An enhancement was observed in the resonant third-harmonic generation of an intense short-pulse laser in plasma embedded with a magnetic Wiggler with a density transition. A plasma density ramp played an important role in the self-focusing, enhancing the third-harmonic generation in plasma. We also examined the ef- fect of the Wiggler magnetic field on the pulse slippage of the third-harmonic pulse in plasma. The pulse slippage was due to the group-velocity mismatch between the fundamental and third-harmonic pulses.

关键词： short pulse laser pulse slippage third harmonic generation plasma