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MXene-based nanomaterials as adsorbents for wastewater treatment:a review on recent trends

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Frontiers of Materials Science 2022年第1期16卷 55-70页

作者： Rajesh K.JENA Himadri Tanaya das Braja N.PATRA Nigamananda das Centre of Excellence in Advanced Materials and Applications Utkal UniversityVani ViharBhubaneswar 751004India Department of Chemistry Utkal UniversityVani ViharBhubaneswar 751004India

The wastewater treatment is a challenging research area to reduce the increasing pressure on limited fresh water *** several techniques adopted and practiced,adsorption is one of the most effective and sustainable ecofriendly *** recent years,MXene nanomaterials,a new family of transition metal carbides,have gained increasing attention as the potential adsorbent for pollutants due to their unique features such as large surface area with abundant active sites and hydrophilicity.A wide range of pollutants *** metal ions,organic dyes,radionuclides,and toxic gas molecules have been sensed by 2D *** inclusive understanding on the adsorptive behavior of MXene-based materials is needed to explain the removal mechanism and effects of different adsorption *** review gives a general overview on recent research progress on MXene materials with special reference to their applications for the adsorptive removal of different *** general trends in the synthesis of MXenes,their stability and different factors affecting the adsorption process along with the main challenges in understanding the full potential of MXenes for environmental applications are discussed.

关键词： MXene adsorption wastewater treatment heavy metal radionuclide

Off-Pump Coronary Artery Bypass Grafting in Patients with Left Ventricular Dysfunction: Short-Term Results from a Single Center in Bangladesh

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World Journal of Cardiovascular Surgery 2024年第9期14卷 145-156页

作者： Muhit Abdullah Md. Abir Tazim Chowdhury Satyajit Sharma Rehana Akther Munama Magdum Munjerin Refat Synthee Md. Zafar-Al-Nimari Saikat das Gupta Saleh Ahmed Samir Kumar Biswas M. Quamrul Islam Talukder Farooque Ahmed Department of Cardiac Surgery National Heart Foundation Hospital and Research Institute (NHFH&RI) Dhaka Bangladesh Department of Cardiothoracic and Vascular Surgery Evercare Hospital Dhaka Dhaka Bangladesh Ispahani Islamia Eye Institute & Hospital Khamarbari Dhaka Bangladesh National Institute of Preventive and Social Medicine Dhaka Bangladesh Square Hospital Dhaka Bangladesh

Background: Off-pump coronary artery bypass grafting (OPCAB) is considered a safer alternative to on-pump surgery, especially in patients with left ventricular dysfunction (LVD). Objectives: This study assessed short-term outcomes and functional improvements in LVD patients post-OPCAB. Methods: The study included 200 coronary artery disease patients who underwent isolated off-pump coronary artery bypass grafting (OPCAB) at the National Heart Foundation Hospital and Research Institute between January 2019 and June 2020. Patients were categorized into Group 1, with a left ventricular ejection fraction (LVEF) of 30% - 39%, and Group 2, with an LVEF of 40% or higher. Echocardiographic assessments of left ventricular dimensions and ejection fraction were performed preoperatively, at discharge, and one month postoperatively. Results: In Group 1, preoperative left ventricular internal dimensions during diastole (LVIDd) and systole (LVIDs) were 53.48 ± 4.40 mm and 44.23 ± 3.93 mm, respectively, with a left ventricular ejection fraction (LVEF) of 35.28% ± 2.26%. At discharge, these values improved to 51.58 ± 4.04 mm (LVIDd), 41.23 ± 5.30 mm (LVIDs), and 39.25% ± 3.75% (LVEF). One month postoperatively, further improvements were observed: 46.29 ± 3.76 mm (LVIDd), 37.45 ± 3.68 mm (LVIDs), and 43.22% ± 4.67% (LVEF). Group 2 showed similar positive outcomes, with preoperative values of 47.09 ± 5.06 mm (LVIDd), 35.11 ± 5.25 mm (LVIDs), and 50.13% ± 7.25% (LVEF), improving to 42.37 ± 4.18 mm (LVIDd), 31.05 ± 4.19 mm (LVIDs), and 55.33% ± 7.05% (LVEF) at one month postoperatively. Both groups demonstrated significant improvements in left ventricular function and NYHA class, with most patients moving from class III/IV to I/II. Complications were minimal, and no mortality was observed. Conclusion: OPCAB is safe and effective for patients with LVEF 30% - 39% and LVEF ≥ 40%, providing significant short-term functional improvements without increased risk.

关键词： Off-Pump Coronary Artery Bypass Grafting Left Ventricular Dysfunction (LVD) Short-Term Outcomes

Effect of rock bolt support mechanism on tunnel deformation in jointed rockmass: A numerical approach

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Underground Space 2021年第4期6卷 409-420页

作者： Ratan das Trilok Nath Singh Department of Geology Rajiv Gandhi UniversityArunachal Pradesh 791112India Department of Earth Sciences Indian Institute of Technology BombayMumbaiIndia

A parametric study was conducted to determine the influence of different bolt parameters(bolt length and diameter)on the maximum induced boundary displacements in jointed rockmass,using a numerical method based on finite element *** different types of jointed systems(Type A,Type B,and Type C)were considered and *** A displays normal joint closure,Type B demonstrates a combination of normal and shear joint closure,and in Type C,the majority of the joint is loaded in shear *** ground surface settlement profiles for these three joint systems,under unsupported conditions,are presented in this *** the same rockmass properties,the cases in Type A and Type B exhibit the maximum and minimum settlement,*** each joint type,the effect of variable bolt parameters on the tunnel boundary is studied in terms of the total *** simulation results confirm that an increase in the bolt length does not significantly reduce the boundary displacement,whereas an increase in the bolt diameter substantially reduces the tunnel boundary displacement.

关键词： Jointed rockmass Tunnel deformation Rock bolt FEM

Litterfall,decomposition and nutrient release of Shorea robusta and Tectona grandis in a sub-tropical forest of West Bengal,Eastern India

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Journal of Forestry Research 2016年第5期27卷 1055-1065页

作者： Chittaranjan das Naba Kumar Mondal Department of Environmental Science The University of Burdwan

We studied leaf litter fall, decomposition and nutrient release patterns of Shorea robusta and Tectona grandis by using a litter bag technique to better understand the release pattern of nutrients to soil from leaf litter. Annual litterfall varied from 13.40 ± 2.56 t ha-1 a-1 for S. robusta to 11.03 ± 3.72 t ha-1 a-1 for T. grandis and the decay constant （k） of decomposed leaf litter was distinctly higher for T. grandis （2.70 ± 0.50 a-1） compared to S. robusta （2.41 ±0.30 a-1）. Biomass loss was positively correlated with the initial litter C, WSC, C/N and ash content in S. robusta and N, P and K concentration for T. grandis. Biomass was negatively correlated with lignin and L/N ratio for S. robusta and L, WSC, L/N and C/N ratio for T. grandis （P 〈 0.01）. Nutrient use efficiency （NUE） and nutrient accumulation index （NAI） of S. robusta was higher than for T. grandis. The retranslocation of bioelements from senescent leaves ranked as P 〉 N 〉 K. Annual N, P and K input to soil through litterfall differed significantly between the two species in the following order： N〉K^P. S. robusta was superior in terms of K and P return and T. grandis was superior in terms of N return. The two tree species showed a similar patterns of nutrient release （K 〉 P 〉 N） during decomposition of their leaf *** of N, K and P were the primary limiting nutrients returned to soil through litterfall with important roles in soil fertility and forest productivity.

关键词： Decay constant Lignin Litterfall Nutrientreturn Decomposition Nutrient use efficiency

Violence study of healthcare workers and systems in the Caribbean:ViSHWaS-Caribbean study

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World Journal of Methodology 2024年第3期14卷 106-118页

作者： Reshon Hadmon Daniella Myriam Pierre Akshat Banga Jacques W Clerville Hans Mautong Precious Akinsanya Rajat das Gupta Sama Soliman Tolupe M Hunjah Bamidele A Hunjah Hafeez Hamza Ruman Khurshid Qasba Faisal A Nawaz Salim Surani Rahul Kashyap Department of Medicine St.George University School of MedicineGrenada FZ818West Indies Department of Research Global Remote Research Scholar ProgramSt PaulMN 55101United States Department of Public Health Cuny Graduate School of Public Health and Health PolicyNew YorkNY 10027United States Department of Internal Medicine Sawai Man Singh Medical CollegeJaipur 302004India School of Public Health Georgia State UniversityAtlantaGA 30302United States Department of Sociology and Demography School of HealthUniversidad de Especialidades Espiritu SantoSamborondon 092301Ecuador Department of Medicine Holy Name Medical CenterTeaneckNJ 07666United States Department of Epidemiology and Biostatistics University of South CarolinaColumbiaSC 29208United States Department of Medicine Pavlov First State Medical University of St PetersburgSankt-Peterburg 197022Russia Department of Medicine University of SuffolkIpswich IP41QJUnited Kingdom Department of Medicine Unicaf University of ZambiaLusaka 20842Zambia Department of Pharmacy School of PharmacyGirne 99428Cyprus Department of Medicine Sher-i-KashmirInstitute of Medical ScienceSrinagar 190011India Department of Psychiatry Al Amal Psychiatric HospitalEmirates Health ServicesDubaiUnited Arab Emirates Department of Medicine and Pharmacology Texas A and M UniversityCollege StationTX 77843United States Anesthesiology and Critical Care Mayo ClinicRochesterMN 55905United States Department of Research Wellspan HealthYorkPA 17403United States

BACKGROUND Violence against healthcare workers(HCWs)in the Caribbean continues to prevail yet remains *** aim is to determine the cause,traits,and consequences of violence on HCWs in the *** To determine the cause,traits,and consequences of violence on HCWs in the *** This research adopted an online cross-sectional survey approach,spanning over eight weeks(between June 6th and August 9th,2022).The survey was generated using Research Electronic Data Capture forms and followed a snowballing strategy to contact individuals using emails,social media,text messages,*** regression analysis was performed to evaluate the variables that influence violence,including gender,age,years of experience,institution type,and night shift *** The survey was completed by 225 *** comprised 61%.Over 51%of respondents belonged to the 21 to 35 age ***(n=61),Haiti(n=50),and Grenada(n=31)had the most *** HCWs(49%)worked for government academic institutions,followed by community hospitals(23%).Medical students(32%),followed by attending physicians(22%),and others(16%)comprised the most common cadre of *** 39%of the participants reported experiencing violence themselves,and 18%reported violence against colleague(s).Verbal violence(48%),emotional abuse(24%),and physical misconduct(14%)were the most common types of *** 63%of respondents identified patients or their relatives as the most frequent *** logistic regression analyses demonstrated that female gender(OR=2.08;95%CI:1.16-3.76,P=0.014)and higher frequency of night shifts(OR=2.22;95%CI:1.08-4.58,P=0.030)were associated with significantly higher odds of experiencing *** than 50%of HCWs felt less motivated and had decreased job satisfaction post-violent *** A large proportion of HCWS in the Caribbean are exposed to violence,yet the phenomenon remains *** a result,HCWs’job s

关键词： ViSHWaS Healthcare workers Violence Survey Workplace violence Caribbean Cross-sectional study

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

Deep Neural Network and Pseudo Relevance Feedback Based Query Expansion

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Computers, Materials & Continua 2022年第5期71卷 3557-3570页

作者： Abhishek Kumar Shukla Sujoy das Department of Mathematics Bio-Informatics and Computer ApplicationsMaulana Azad National Institute of Technology BhopalBhopalMadhya Pradesh462003India

The neural network has attracted researchers immensely in the last couple of years due to its wide applications in various areas such as Data mining,Natural language processing,Image processing,and Information retrieval *** embedding has been applied by many researchers for Information retrieval *** this paper word embedding-based skip-gram model has been developed for the query expansion *** terms are obtained from the top“k”initially retrieved documents using the Pseudo relevance feedback model and then they are trained using the skip-gram model to find the expansion terms for the user *** performance of the model based on mean average precision is *** proposed model compares with other existing *** improvement of 6.61%,6.93%,and 9.07%on MAP value is observed compare to the Original query,BM25 model,and query expansion with the Chi-Square model *** proposed model also retrieves 84,25,and 81 additional relevant documents compare to the original query,query expansion with Chi-Square model,and BM25 model respectively and thus improves the recall value *** per query analysis reveals that the proposed model performs well in 30,36,and 30 queries compare to the original query,query expansion with Chi-square model,and BM25 model respectively.

关键词： Information retrieval query expansion word embedding neural network deep neural network

Study of grain alignment efficiency and a distance estimate for small globule CB4

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Research in Astronomy and Astrophysics 2015年第7期15卷 953-962页

作者： Ajoy Barman Himadri Sekhar das Department of Physics Assam University

We study the polarization efficiency（defined as the ratio of polarization to extinction） of stars in the background of the small, nearly spherical and isolated Bok globule CB4 to understand the grain alignment process. A decrease in polarization efficiency with an increase in visual extinction is noticed. This suggests that the observed polarization in lines of sight which intercept a Bok globule tends to show dominance of dust grains in the outer layers of the globule. This finding is consistent with the results obtained for other clouds in the past. We determined the distance to the cloud CB4 using near-infrared photometry（2MASS J H KScolors） of moderately obscured stars located at the periphery of the cloud. From the extinction-distance plot,the distance to this cloud is estimated to be（459 ± 85） pc.

关键词： polarization -- ISM: clouds -- dust extinction -- ISM: individual ob-jects: CB4

Perovskites for Laser and Detector Applications

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Energy & Environmental Materials 2019年第2期2卷 146-153页

作者： Saunak das Somayeh Gholipour Michael Saliba Institute of Physical Chemistry(IPC) Friedrich Schiller University JenaHelmholtzweg 4Jena 07743Germany Leibniz Institute of Photonic Technology(IPHT) Albert-Einstein-Str.907745Jena Germany Adolphe Merkle Institute University of Fribourg CH 1700Switzerland Institute of Materials Science Technical University of DarmstadtD-64287Germany

Perovskite materials have triggered a renewed interest in photovoltaic research in the recent *** display crystal forms with 0D,1D and 2D,3D motifs,and several chemical forms,namely inorganic(titanates,rubidiates,nobiates,tantalates etc.),organic/inorganic metal halides with single to multiple cations,and even organic polymer or quantum dot-infused *** crystal type and chemical form are endowed with specific physicochemical,optical,electronic,and morphological *** unique properties render them suitable for targeted applications,namely photovoltaics,LEDs,photocatalysis/electrolysis/solar fuels/solar and Li-ion batteries,gas-sensors,ferroelectrics,capacitors,transistors and memristors,photodetectors,and lasers,for advanced quantum cryptography and outer space *** first,the crystal and material types,and physicochemical,morphological,and optoelectronic properties of perovskite materials are ***,we focus on those properties which cumulatively contribute to their application in the abovementioned ***,a comprehensive discussion about the advances in each field is ***/property/application relationships with key advances demonstrate the versatility of perovskites in modern optoelectronic technologies.

关键词： 2D perovskites hybrid perovskites micro-lasers X-ray detectors c-ray detectors