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Characteristics of MOF, MWCNT and graphene containing materials for hydrogen storage: A review

Journal of Energy Chemistry 2019年第3期28卷 132-144页

作者： Kranthi kumar Gangu suresh Maddila Saratchandra Babu Mukkamala Sreekantha B Jonnalagadda School of Chemistry & Physics University of KwaZulu-Natal Westville Campus Department of Chemistry GITAM Institute of Science GITAM University

Hydrogen is a generally abundant, safe, clean and environmentally apt alternative fuel, which replenishes the void generated by depleting fossil fuel reserves. The adoption of hydrogen as an energy source has been restricted to low levels due to the complications associated with its viable storage and usage. Existing technologies, such as storage of hydrogen in compressed and liquefied forms are not adequate to meet the broad on-board applications. The gravimetric energy density(120 MJ/kg) of hydrogen is three times higher than that of gasoline products, so solid-state hydrogen storage is ***-organic frameworks(MOFs), multi-walled carbon nanotubes(MWCNTs) and graphene are solid adsorbents majorly employed for efficient H_2 storage. The prominent features of MOFs such as permanent porosity, structural rigidity, and surface area are attractive and ideal for hydrogen storage. In addition,nanostructured carbon materials(MWCNTs and graphene) and their composites have demonstrated significant hydrogen storage capacities. Some important parameters for the success of the hydrogen economy include high storage density, adsorption/desorption temperature and cycling time. Cryo-hydrogen storage was achieved in MOFs and their composites with carbon structures, but storage at ambient temperature and acceptable pressures is a major hurdle. This review discusses various strategies and mechanisms in the design of adsorbents explored to improve H_2 storage capacities and afford opportunities to develop new sustainable hydrogen technologies to meet energy targets.

关键词： Hydrogen storage Metal-organic frameworks MWCNTs/Graphene Nanocomposites Spillover Hydrogen economy

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Colorectal cancer screening in human immunodeficiency virus population:Are they at average risk?

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World Journal of Gastrointestinal Oncology 2012年第12期4卷 259-264页

作者： suresh kumar Nayudu Bhavna Balar Division of Gastroenterology Department of MedicineBronx Lebanon Hospital CenterAffiliated with Albert Einstein College of MedicineYeshiva University

AIM:To evaluate if human immunodeficiency virus (HIV) population is getting adequate screening for colon cancer in the highly active anti-retroviral treatment (HAART) era with improved longevity, and the prevalence of polyps and adenomas in this population, when compared with the general population. METHODS:We conducted retrospective chart review of average-risk HIV population for colon cancer attending our infectious disease clinic. Individuals who underwent diagnostic colonoscopy were excluded. We extracted various demographic, HIV disease-specific and colonoscopy data including histo-pathological reports in the last 10 years. Total population was divided into a study group, who underwent screening colonoscopy and a control group who did not. We analyzed data using standard statistical methods and software. RESULTS:We found that 25% of average-risk HIVinfected population was screened for colon cancer using colonoscopy. There was no difference in gender and ethnic distribution between the groups. We foundwider distribution of age (50-84 years with mean 56 years) in the control group when compared to (50-73 years with mean 58 years) the study group. However, there were 89% of subjects with well-controlled HIV disease measured by HIV RNA copies of < 75 in the study group when compared with 70% in the control group (P < 0.0001). We noticed polyp detection rate of 55% and adenoma detection rate of 32% in HIV population. CONCLUSION:It is unclear whether HIV or HAART medications play a role in increased prevalence of adenomas. We suggest that when estimating the risk for colonic neoplasms, HIV population should be considered as a high-risk group and screened accordingly.

关键词： Colorectal cancer Screening Human immunodeficiency virus Highly active anti-retroviral treatment

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Functional peptides in Asian protein rich fermented foods:production and health benefits

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Systems Microbiology and Biomanufacturing 2022年第1期2卷 1-13页

作者： Reena kumari Samurailatpam Sanjukta Dinabandhu sahoo Amit kumar Rai Institute of Bioresources and Sustainable Development Regional CentreTadongGangtokSikkimIndia Department of Botany University of DelhiNew DelhiIndia

The richness and diversity of protein rich fermented foods are chiefy observed in many Asian *** are potential source of wide range of biologically active peptides depending on the protein source and starter culture used for *** major protein rich fermented foods popularly consumed in Asian countries include fermented soybean,fermented milk and fermented fsh *** foods are fermented using diferent starter cultures including lactic acid bacteria(LAB),Bacillus species,yeast and flamentous *** by individual starter culture results in unique products by a series of enzymatic hydrolysis,leading to production of a diversity of bioactive peptides responsible for health *** peptides in Asian protein rich fermented foods have been reported for exhibiting antihypertensive,antioxidant,antibacterial,antidiabetic and anticancer *** review is focused on Asian protein rich fermented foods,associated microbes and bioactive peptides responsible for health benefts.

关键词： Fermented foods Peptides Health benefts Asia Microorganism

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Evolution of fracture permeability due to co-colloidal bacterial transport in a coupled fracture-skin-matrix system

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Geoscience Frontiers 2012年第4期3卷 503-514页

作者： N.Natarajan G.suresh kumar EWRE Division Department of Civil EngineeringIndian Institute of TechnologyMadrasChennai 600036India Department of Ocean Engineering Indian Institute of TechnologyMadrasChennai 600036India

A numerical model is developed for investigating the evolution of fracture permeability in a coupled fracture-matrix system in the presence of fracture-skin with simultaneous colloidal and bacte- rial transport, by taking into account the effects of thermal stress and silica precipitation/dissolution, which is computed using linear reaction kinetics. The non-linear coupled equations are numerically modeled using the fully implicit finite difference method and a constant continuous source is adopted while modeling thermal, contaminant, colloidal and bacterial transport. Due to co-colloid bacterial trans- port under non-isothermal conditions, in a coupled fracture-skin-matrix system, the fracture apertures vary spatially, with a corresponding pressure variation for a constant discharge. A series of numerical experiments were conducted for analyzing the spatial variation of fracture aperture in response to the combined effects of thermal stress, silica precipitation/dissolution, and simultaneous colloidal and bacte- rial transport in the presence of the fracture-skin. The simulation results suggest that temperature and contaminant concentration of the mobile fluid within the fracture increases with reduction in initial frac- ture aperture. The pattern of variation followed by the fracture aperture is nearly the same in the presence and absence of bacterial transport but the magnitude of the fracture aperture is low under the influence of bacterial transport. The variation in the fracture aperture resulting from precipitation-dissolution and thermoelastic stress is significant when the fracture aperture is very low and reduces with increment in fracture aperture. The variation in fracture aperture and pressure remains the same for both undersaturated and supersaturated fluid entering the fracture due to the influence of bacterial transport at the inlet of the fracture.

关键词： Bacterial transport Colloidal transport Fracture permeability Fracture skin Precipitation-dissolution

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Residue recycling options and their implications for sustainable nitrogen management in rice-wheat agroecosystems

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Ecological Processes 2023年第1期12卷 733-751页

作者： Ajay kumar Bhardwaj Kapil Malik Manu Rani Uttam kumar Mandal Nirmalendu Basak Awtar Singh Rajender kumar Yadav suresh kumar Chaudhari Dinesh kumar Sharma Central Soil Salinity Research Institute Kachhwa RoadKarnal 132001HaryanaIndia Central Soil Salinity Research Institute Regional Research StationCanning Town 743329West BengalIndia Indian Council of Agricultural Research New Delhi 110012DelhiIndia Central Soil Salinity Research Institute Regional Research StationLucknow 226005Uttar PradeshIndia

Background In the Indo-Gangetic Plain,rice-wheat is the most extensively practiced crop *** escalating issue of crop residue burning,particularly rice straw,and the necessity to lower the exorbitant expenses associated with fertilizer inputs stand out as significant challenges for farmers in the region.A well-suited integrated nutrient management(INM)strategy that focuses on recycling crop residues can serve as a solution to address these *** a strategy not only mitigates air pollution resulting from residue burning but also helps combat water pollution due to nitrate losses from *** experiments were used to evaluate the suitability of eight INM-modules that included various combinations of inorganic fertilizer rates(50%,100%,150%of recommended dose),crop residues(wheat and rice stubble retention at 30 cm standing stubble equivalent to 1/3 the straw yield),rice straw compost(RSC),farmyard manure(FYM),and green manuring(GM),compared to 100%recommended dose of fertilizers(F)and no fertilizer *** There was a considerable improvement in nitrogen mineralization,grain yields,and nitrogen use efficiency under GM+RSC-F50 and GM+*** INM modules would permit a 50%reduction in the use of chemical *** was a little yield penalty with in situ rice residue incorporation at 100%F;however,this could be overcome with 150%F fertilizer *** situ retention of wheat straw with a full application of fertilizer resulted in steadily rising crop yields over *** in the redox potential,soil pH,and soil organic carbon best accounted for the observed trajectories in nitrogen use *** The most promising INM modules for adoption by farmers in the Indo-Gangetic Plain to judiciously use crop residues and curtail chemical fertilizer inputs are green manuring with Sesbania aculeata+rice straw compost at 5 t ha^(−1)+only 50%of recommended dose of fertilizers(GM+RSC-F50),and green manuring with

关键词： Rice–wheat Nitrogen use efficiency Sustainable nitrogen management index Crop residue Rice straw compost

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Multivariate Broadcast Encryption with Group Key Algorithm for Secured IoT

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Computer Systems Science & Engineering 2023年第4期45卷 925-938页

作者： M.suresh kumar T.Purosothaman Department of Computer Sceince and Engineering Sri Ranganathar Institute of Engineering and TechnologyCoimbatore641110India Department of Electronics and Communication Engineering Government College of TechnologyCoimbatore641013India

The expanding and ubiquitous availability of the Internet of Things(IoT)have changed everyone’s life easier and more *** time it also offers a number of issues,such as effectiveness,security,and excessive power consumption,which constitute a danger to intelligent IoT-based *** managing is primarily used for transmitting and multi-pathing communications that are secured with a general group key and it can only be decrypted by an authorized group member.A centralized trustworthy system,which is in charge of key distribution and upgrades,is used to maintain group *** provide longitudinal access controls,Software Defined Network(SDN)based security controllers are employed for group administration *** service providers provide a variety of security *** are just a few software security answers *** the proposed system,a hybrid protocols were used in SDN and it embeds edge system to improve the security in the group ***-based algorithms compared with Group Key Establishment(GKE)and Multivariate public key cryptosystem with Broadcast Encryption in the proposed *** all factors are considered,Broadcast Encryption(BE)appears to become the most logical solution to the *** enables an initiator to send encrypted messages to a large set of recipients in a efficient and productive way,meanwhile assuring that the data can only be decrypted by defining *** proposed method improves the security,efficiency of the system and reduces the power consumption and minimizes the cost.

关键词： Internet of things encryption decryption group key software defined network public key security

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Phenomenological modelling of flow behaviour of 20MnMoNi55 reactor pressure vessel steel at cryogenic temperature with different strain rates

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Defence Technology（防务技术） 2019年第3期15卷 326-337页

作者： Swagatam Paul Partha Dey Snehasish Bhattacharjee Sanjib kumar Acharyya Prasanta sahoo Jayanta Chattopadhyay Department of Mechanical Engineering Jadavpur University Kolkata India Department of Mechanical Engineering Academy of Technology Hooghly West Bengal India Bhaba Atomic Research Centre Mumbai India

In the present study a phenomenological constitutive model is developed to describe the flow behaviour of 20MnMoNi55 low carbon reactor pressure vessel (RPV) steel at sub-zero temperature under different strain rates. A set of uniaxial tensile tests is done with the variation of strain rates and temperature ranging from 10^-4s^-1 to 10^-1s^-1 and -80℃ to 140℃ respectively. From the experimental data, family of flow curves at different temperatures and strain rates are generated and fitted exponentially. The strain rate and temperature dependence of the coefficients of the exponential flow curves are extracted from these curves and characterised through a general phenomenological constitutive coupled equation. The coefficients of this coupled equation are optimised using genetic algorithm. Finite element simulation of tensile tests at different strain rates and temperatures are done using this coupled equation in material model of Abaqus FEA software and validated with experimental results. The novelties of proposed model are:(a) it can predict precisely the flow behaviour of tensile tests (b) it is a simple form of equation where fitting parameters are both function of strain rate ratio and temperature ratio,(c) it has ability to characterize flow behaviour with decreasing subzero temperatures and increasing strain rates.

关键词： Flow behaviour RPV steel Cryogenic temperature Strain rate

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Characteristics of La-modified Ni-Al_2O_3 and Ni-SiO_2 catalysts for CO_x-free hydrogen production by catalytic decomposition of methane

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Journal of Energy Chemistry 2013年第6期22卷 853-860页

作者： Chatla Anjaneyulu Velisoju Vijay kumar suresh K.Bhargava Akula Venugopal Inorganic & Physical Chemistry Division CSIR-Indian Institute of Chemical Technology College of Science Engineering and Health Advanced Materials & Industrial Chemistry School of Applied Sciences RMIT University

Hydrotalcite precursors of La modified Ni-Al2O3 and Ni-SiO2 catalysts prepared by co-precipitation method and the catalytic activities were examined for the production of COx-free H2 by CH4 decomposition. Physico-chemical characteristics of fresh, reduced and used catalysts were evaluated by XRD, TPR and O2 pulse chemisorptions, TEM and BET-SA techniques. XRD studies showed phases due to hydrotalcite-like precursors in oven dried form produced dispersed NiO species upon calcination in static air above 450 C. Raman spectra of deactivated samples revealed the presence of both ordered and disordered forms of carbon. Ni-La-Al2O3catalyst with a mole ratio of Ni : La : Al = 2 : 0.1 : 0.9 exhibited tremendously high longevity with a hydrogen production rate of 1300 molH2 mol 1 Ni. A direct relationship between Ni metal surface area and hydrogen yields was established.

关键词： CH4 decomposition Ni-La-Al hydrotalcite Ni metal surface area COx-free H2

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Evaluation of hydro-chemistry in a phreatic aquifer in the Vindhyan Region, India, using entropy weighted approach and geochemical modelling

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Acta Geochimica 2023年第4期42卷 648-672页

作者： Ashutosh Mishra Aman Rai Prabuddh kumar Mishra suresh Chand Rai Department of Geography Delhi School of EconomicsUniversity of DelhiDelhi 110027India Department of Geography Shivaji CollegeUniversity of DelhiDelhi 110027India

Groundwater quality monitoring and geochemical characterization in the phreatic aquifer are critical for ensuring universal and equitable access to clean,reliable,and inexpensive drinking water for *** research was intended to investigate the hydrogeochemical attributes and mechanisms regulating the chemistry of groundwater as well as to assess spatial variation in groundwater quality in Satna district,*** accomplish this,the groundwater data comprising 13 physio-chemical parameters from thirty-eight phreatic aquifer locations were analysed for May 2020 by combining entropy-weighted water quality index(EWQI),multivariate statistics,geochemical modelling,and geographical information *** findings revealed that the groundwater is fresh and slightly *** was a significant concern as 57.89% of samples were beyond the permissible limit of the World Health *** dominance of ions were in the order of Ca^(2+)> Na^(+)> Mg^(2+)> K^(+) and HCO_(3)^(-)> SO_(4)^(2-)> Cl^-> NO_(3)^(-)> F^(-).Higher concentration of these ions is mainly concentrated in the northeast and eastern *** correlation analysis and principal component analysis(PCA) demonstrated that both natural and human factors regulate groundwater chemistry in the *** analysis of Q-mode agglomerative hierarchical clustering highlighted three significant water ***-HCO_3 was the most prevalent hydro-chemical facies in all three *** modelling through various conventional plots indicated that groundwater chemistry in the research region is influenced by the dissolution of calcite/dolomite,reverse ion exchange,and by silicate and halite *** data of the study area disclosed that 73.69% of the samples were appropriate for *** to high salinity,Magnesium(Mg^(2+)),Nitrate(NO_(3)^(-)),and Bicarbonate(HCO_(3)^(-)) concentrations,the north-central and north-eastern regions are particularly *** findings of the study m

关键词： Groundwater quality assessment EWQI Multivariate statistical analysis Geochemical modelling Hydrogeochemical processes Saturation index

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Determining bioclimatic space of Himalayan alder for agroforestry systems in Nepal

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Plant Diversity 2018年第1期40卷 1-18页

作者： Santosh kumar Rana Hum Kala Rana Krishna kumar Shrestha suresh Sujakhu Sailesh Ranjitkar Key Laboratory{or Plant Diversity and Biogeography of East Asia Kunming Institute of BotanyKunming 650201China University of Chinese Academy of Sciences Beijing 100049China Systematics and Biodiversity Unit Central Department of BotanyTribhuvan UniversityKirtipurKathmanduNepal jade Consult Private Limited KabilmargThapathaliKathmanduPOB 746Nepal World Agroforestry Centre East and Central Asia 132 Lanhei RdHeilongtanKunmingChina

Himalayan alder species are proven to be very useful in traditional as well as contemporary agroforestry practice. These nitrogen-fixing trees are also useful in the land restoration. Therefore, understanding the distribution of Himalayan alder and the potential zone for plantation is meaningful in the agroforestry sector. Suitable climatic zones of Alnus spp. were modelled in Max Ent software using a subset of least correlated bioclimatic variables for current conditions(1950 -2000), topographic variables(DEM derived) and Landuse Landcover(LULC) data. We generated several models and selected the best model against random models using ANOVA and t-test. The environmental variables that best explained the current distribution of the species were identified and used to project into the future. For future projections, ensemble scenarios of climate change projection derived from the results of 19 Earth System Models(ESM) were used. Our model revealed that the most favorable conditions for Alnus nepalensis are in central Nepal in the moist north-west facing slope, whereas for Alnus nitida they are in western *** major climatic factor that contributes to Alnus species distribution in Nepal appears to be precipitation during the warmest quarter for A. nepalensis and precipitation during the driest quarter for A. nitida. Future projections revealed changes in the probability distribution of these species, as well as where they need conservation and where they can be planted. Also, our model predicts that the distribution of Alnus spp. in hilly regions will remain unchanged, and therefore may represent sites that can be used to revitalize traditional agroforestry systems and extract source material for land restoration.

关键词： Alder Agroforestry Species distribution modeling Climate change MaxEnt

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