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Digital Communications and Networks 2020年第4期6卷 486-503页

作者： Emy Setyaningsih Retantyo Wardoyo anny Kartika Sari Department of Computer System Engineering Institut Sains Teknologi AKPRINDYogyakartaIndonesia Department of Computer Science and Electronics Universitas Gadjah MadaYogyakartaIndonesia

There are a few issues related to the existing symmetric encryption models for color image data,such as the key generation and distribution *** this paper,we propose a compression-encryption model to solve these *** model consists of three *** first process is the dynamic symmetric key *** second one is the compression process,which is followed by encryption using keystreams and S-Boxes that are generated using a chaotic logistic *** last process is the symmetric key *** symmetric key is encrypted twice using Rivest-Shamir-Adleman(RSA)to provide both authentication and ***,it is inserted into the cipher image using the End of File(EoF)*** evaluation shows that the symmetric key generator model can produce a random and dynamic symmetric ***,the image data is safe from ciphertext-only *** model is fast and able to withstand entropy attacks,statistical attacks,differential attacks,and brute-force attacks.

关键词： Compression-encryption S-Box Chaotic logistic map End of file Symmetric key distribution

Additive manufacturing of biodegradable magnesium-based materials:Design strategies,properties,and biomedical applications

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Journal of Magnesium and Alloys 2023年第3期11卷 801-839页

作者： Farzad Badkoobeh Hossein Mostaan Mahdi Rafiei Hamid Reza Bakhsheshi-Rad Seeram Rama krishna Xiongbiao Chen School of Metallurgy and Materials Engineering College of EngineeringUniversity of TehranTehranIran Faculty of Engineering Department of Materials and Metallurgical EngineeringArak UniversityArakIran Advanced Materials Research Center Department of Materials EngineeringNajafabad BranchIslamic Azad UniversityNajafabadIran Department of Mechanical Engineering National University of Singapore9 Engineering Drive 1Singapore 117576Singapore Department of Mechanical Engineering College of EngineeringUniversity of SaskatchewanSaskatoonSK S7N 5A9Canada

Magnesium(Mg)-based materials are a new generation of alloys with the exclusive ability to be biodegradable within the human/animal *** addition to biodegradability,their inherent biocompatibility and similar-to-bone density make Mg-based alloys good candidates for fabricating surgical bioimplants for use in orthopedic and traumatology *** this end,nowadays additive manufacturing(AM)along with three-dimensional(3D)printing represents a promising manufacturing technique as it allows for the integration of bioimplant design and manufacturing processes specific to given ***,this technique also faces many new challenges associated with the properties of Mg-based alloys,including high chemical reactivity,potential for combustion,and low vaporization *** this review article,various AM processes to fabricate biomedical implants from Mg-based alloys,along with their metallic microstructure,mechanical properties,biodegradability,biocompatibility,and antibacterial properties,as well as various post-AM treatments were critically ***,the challenges and issues involved in AM processes from the perspectives of bioimplant design,properties,and applications were identified;the possibilities and potential scope of the Mg-based scaffolds/implants are discussed and highlighted.

关键词： Magnesium alloy Additive manufacturing 3D Printing Bone tissue engineering Scaffold Mechanical and biological properties

Th-MOF showing six-fold imide-sealed pockets for middle-sizeseparation of propane from natural gas

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Nano Research 2023年第2期16卷 3287-3293页

作者： Li Wang Wenhui Zhang Jie Ding Lele Gong Rajamani krishna Youyuan Ran Lan Chen Feng Luo Jiangxi Province Key Laboratory of Synthetic Chemistry School of ChemistryBiology and Material ScienceEast China University of TechnologyNanchang 330013China Van’t Hoff Institute for Molecular Sciences University of AmsterdamScience Park 9041098 XH AmsterdamThe Netherlands

Separation of propane from natural gas is of great importance to ***,in light of size-based separation,there still lacks effective method to directly separate propane from natural gas,due to the comparable physical properties for these light alkanes(C1–C4)and the middle size of *** this work,we found that a new Th-metal-organic framework(MOF)could be an ideal solution for this *** Th-MOF takes UiO-66-type structure,but with the pocket sealed by six-fold imide groups;this not only precisely reduces the size of pocket to exactly match propane,but also enhances the host–guest interactions through multiple(C)H(^(δ+))∙∙∙(^(δ−))O(C)*** a result,highly selective adsorption of propane over methane,ethane,and butane was observed,implying unique middle-size *** actual separation was confirmed by breakthrough experiments of simulated natural gas,confirming its superior application in direct separation of propane from natural *** separation mechanism,as unveiled by both theoretical calculation and comparative experiments,is due to the six-fold imide-sealed pocket that could effectively distinguish propane from other light alkanes through both size effect and host–guest interactions.

关键词： Th-metal-organic framework(MOF) intermediate-size-separation natural gas selectivity

TGA/DSC study to characterise and classify coal seams conforming to susceptibility towards spontaneous combustion

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International Journal of Mining Science and Technology 2022年第1期32卷 75-88页

作者： Niroj Kumar Mohalik Somu Mandal Santosh Kumar Ray Asfar Mobin Khan Debashish Mishra Jai krishna Pandey CSIR-Central Institute of Mining and Fuel Research(CIMFR) Dhanbad 826015India Academy of Scientific and Innovative Research(AcSIR) Ghaziabad 201002India

Thermogravimetric analysis/differential scanning calorimeter(TGA/DSC)technique along with basic coal characteristics study is carried out for eighty coal samples of Indian coalfields,to determine spontaneous combustion propensity behaviour of *** study of coal samples indicates that there is an increase in the mass of coal samples in the temperature range 150-350℃,which may be due to oxygen adsorption and *** correlation and principal component analysis states that the component of proximate analysis(M_(ad),VM_(d),FR,and VR)have an acceptable correlation with the TGA experiments results i.e.,Tgsh and *** fixed nonlinear regression analysis shows that thermogravimetry(TG)experiment results Tgign may be the best index to categorise/classify the coal as per their susceptibility towards spontaneous *** authors proposed four groups of classification as per their propensity towards spontaneous combustion depending upon the moisture(M_(ad)),volatile matter(VM_(d)),and TG ignition temperature from differential thermogravimetric(DTG)curve(Tgign)using hierarchal clustering *** coal samples of different seams from Indian coalfield may be classified into four different clusters,*** highly/extremely susceptible(Tgign320℃).The field observations and TGA/DSC experiment results with the following statistical analysis substantiate a similar assessment.

关键词： Coal TGA/DSC Spontaneous combustion TG ignition

Biomass production from microalgae Chlorella grown in sewage,kitchen wastewater using industrial CO_(2)emissions:Comparative study

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Carbon Resources Conversion 2019年第2期2卷 126-133页

作者： P.Kiran Kumar S.vijaya krishna S.Swami Naidu Kavita Verma D.Bhagawan V.Himabindu Centre for Alternative Energy Options Institute of Science and TechnologyJawaharlal Nehru Technological University HyderabadKukatpallyHyderabad 500085TelanganaIndia Centre for Biotechnology Institute of Science and TechnologyJawaharlal Nehru Technological University HyderabadKukatpallyHyderabad 500085TelanganaIndia

Microalgae cultivation using organic wastewater like kitchen wastewater(KWW)and sewage wastewater(SWW)are recommended for wastewater treatment along with simultaneous biomass production which is a cost effective *** is rich in nutrients which might be an efficient wastewater feedstock for microalgae cultivation to achieve reasonably high biomass yield for energy *** has not been investigated extensively for microalgae cultivation till now because of high concentration of ammonia as it could inhibit algae *** order to make KWW suitable for microalgae growth,a common method is to dilute with ***,in the present study,KWW was diluted with water at dilution ration 1:1 and compared with SWW for microalgae biomass growth,biomass yields and nutrient removal efficiency specifically using *** KWW and SWW showed highest biomass productivity in mixotrophic cultivation *** average biomass productivity in SWW was 0.6 g/L which was higher when compared to *** infrared spectroscopy(FTIR)of algal biomass revealed the presence of certain organic compound groups such as eOH,eCOOH,NH_(2),and ■*** was concluded from the results that Chlorella was very effective in the treatment of KWW,SWW and industrial flue gas on the other hand the biomass obtained is a sustainable green energy source for biofuels.

关键词： Kitchen wastewater(KWW) Sewage wastewater(SWW) Flue gas Microalgae Chlorella

Machine-learning-based intelligent framework for discovering refractory high-entropy alloys with improved high-temperature yield strength

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npj Computational Materials 2022年第1期8卷 2247-2257页

作者： Stephen A.Giles Debasis Sengupta Scott R.Broderick krishna Rajan CFD Research Corporation 6820 Moquin Dr.NWHuntsvilleAL35806US Department of Material Design and Innovation University at Buffalo120 Bonner HallBuffaloNY14260USA

Refractory high-entropy alloys(RHEAs)show significant elevated-temperature yield strengths and have potential to use as high-performance materials in gas turbine *** the vast RHEA compositional space experimentally is challenging,and a small fraction of this space has been explored to *** work demonstrates the development of a state-of-the-art machine learning framework coupled with optimization methods to intelligently explore the vast compositional space and drive the search in a direction that improves high-temperature yield *** yield strength model is shown to have a significantly improved predictive accuracy relative to the state-of-the-art approach,and also provides inherent uncertainty quantification through the use of repeated k-fold *** developing and validating a robust yield strength prediction model,the coupled framework is used to discover RHEAs with superior high temperature yield *** have shown that RHEA compositions can be customized to have maximum yield strength at a specific temperature.

关键词： strength alloys entropy

Auditory cortical stimulability in non habilitated individuals-An evidence from CAEPs

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Journal of Otology 2022年第3期17卷 146-155页

作者： Hariprakash Palaniswami Aju Abraham krishna Yerraguntla Department of Speech and Hearing Manipal College of Health ProfessionalsManipal Academy of Higher EducationManipalKarnataka576104India Department of Audiology and Speech Language Pathology Kasturba Medical CollegeMangaloreManipal Academy of Higher EducationManipalKarnataka575001India

Objective:The effect of long term auditory deprivation on Cortical Auditory Evoked Potentials(CAEPs)especially in human models is not well ***,the current study was aimed to investigate the effects of long-term auditory deprivation and stimulability of auditory cortex in non habilitated congenitally deaf adolescents and adults using *** and Results:A total of 27 non-habilitated congenitally deaf adolescents/adults with age and gender matched normal hearing adolescents/adults participated in the *** congenitally deaf group was fitted with high gain hearing aids(first fit).Further,the CAEPs were *** obtained CAEP components were assessed for group effect,source and topographical *** between group analysis for CAEP responses showed a significant difference only for P2 latency and *** source analysis revealed that,in the normal hearing group for CAEPs,the sources were within the temporal ***,in the congenitally deaf group,along with the temporal cortex,the bilateral prefrontal cortex also was ***:The findings revealed that it is possible to stimulate and evoke a matured CAEP response from a long deprived auditory system with adequate acoustic *** presence of CAEP responses is indicative of the functionality of the innate auditory pathway and the crossmodal plasticity in long auditory deprived individuals.

关键词： Auditory deprivation CAEPs Auditory Cortex Congenital deafness Non habilitated adults

Indocyanine green fluorescence in gastrointestinal surgery:Appraisal of current evidence

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World Journal of Gastrointestinal Surgery 2023年第12期15卷 2693-2708页

作者： Raja Kalayarasan Murugesan Chandrasekar Pothugunta Sai krishna Dasarathan Shanmugam Department of Surgical Gastroenterology Jawaharlal Institute of Postgraduate Medical Education and ResearchPuducherry 605006India

Applying indocyanine green(ICG)fluorescence in surgery has created a new dimension of navigation surgery to advance in various *** research in this field is nascent and fragmented,necessitating academic efforts to gain a comprehensive *** present review aims to integrate diverse perspectives and recent advances in its application in gastrointestinal *** relevant articles were selected by using the appropriate keyword search in *** angiography and cholangiography property of ICG fluorescence is helpful in various hepatobiliary *** gastroesophageal and colorectal surgery,the lymphangiography and angiography property of ICG is applied to evaluate bowel vascularity and guide *** lack of objective parameters to assess ICG fluorescence has been the primary limitation when ICG is used to evaluate bowel *** optimum dose and timing of ICG administration need to be standardized in some new application areas in gastrointestinal *** tumor-specific ligands with fluorophores can potentially widen the fluorescence application to detect primary and metastatic gastrointestinal *** narrative review outlines prior contributions,limitations,and research opportunities for future studies across gastrointestinal *** findings of the present review would be helpful for scholars and practitioners to explore and progress in this exciting domain of gastrointestinal surgery.

关键词： Indocyanine green Fluorescence Navigation surgery Angiography Cholangiography Lymphangiography

Influence of wellhead pressure and water cut in the optimization of oil production from gas lifted wells

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Petroleum Research 2022年第2期7卷 253-262页

作者： S.Hari Shanker krishna Manav Patel Pooja Bhatia Rakesh Kumar Vij Drilling Cementing&Stimulation(DCS)Research CentrePandit Deendayal Energy UniversityKnowledge CorridorRaysanGandhinagarGujarat382426India School of Petroleum Technology Pandit Deendayal Energy UniversityKnowledge CorridorRaysanGandhinagarGujarat382426India

The worldwide increase in energy demand necessitates the development and optimization of marginal oil fields for *** this regard,effective and economic production of fluids are heavily relied upon the artificial lift techniques as the reservoir's natural energy may not be able to deliver the fluids to the *** lift is a widely practised and successful method that is suitable for rejuvenating the oil production from such *** this study,the influence of critical parameters like water cut,wellhead pressure(WHP)and gas-lift gas injection rate on the output from a gas lifted well was analysed.A significant reduction in the oil production was observed with the increase in water *** a fixed gas injection rate of 1 Mmscf/day,the production decreased by 26.90%when the water cut increased from 15%to 30%and further by 50.80%when the water cut reached 45%.An increase in the gas injection rate from 1 Mmscf/day to 8 Mmscf/day resulted in an increase in the production rate by 29.21%,40.48%and 56.56%for 15%,30%,and 45%water cut conditions,*** was observed that there is a drop in the oil rate with the increase in WHP for a constant gas injection *** increase in the WHP from 100 psi to 300 psi resulted in a drop in the oil production rate by 11.01%,11.78%and 12.74%for 15%,30%and 45%water cut conditions,*** study sheds light on the significance of optimizing the critical parameters to maximize the production from a well,with severely affected productivity,using a continuous gas lift system.

关键词： Artificial lift Continuous gas lift Productivity Water cut Wellhead pressure

Half-a-century(1971–2020)of glacier shrinkage and climatic variability in the Bhaga basin,western Himalaya

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Journal of Mountain Science 2023年第3期20卷 299-324页

作者： DAS Suresh SHARMA Milap Chand MURARI Madhav krishna NÜSSER Marcus SCHMIDT Susanne Centre for the Study of Regional Development Jawaharlal Nehru UniversityNew Delhi 110067India National Geochronology Facility Inter-University Accelerator CentreNew Delhi 110067India Department of Geography South Asia Institute(SAI)Heidelberg UniversityHeidelberg 69115Germany Heidelberg Centre for the Environment(HCE) Heidelberg UniversityHeidelberg 69120Germany

Glacier shrinkage is a globally occurring ***-resolution change detection based on frequent mapping and monitoring of high-altitude glaciers is necessary to precisely evaluate future water availability and to understand glacier evolution under different climatic scenarios in the Hindukush-Karakoram-Himalayan(HKH)*** also holds true for the Bhaga basin of the western *** study investigates glacier and glacier lake changes in the Bhaga basin,over the last five decades based on satellite imagery including Corona KH4(1971),Landsat 7 Enhanced Thematic Mapper Plus(ETM+;2000),Linear Imaging Self-Scanning Sensor(LISS Ⅳ;2013),and Sentinel 2(2020).Regional temperature and precipitation trends were evaluated from gridded climatic datasets(1900–2020).In the Bhaga basin 306 glaciers(>0.2 km^(2))were mapped with a total area of 360.3±4.0 km^(2),of which 55.7±0.6 km^(2)was covered with debris in *** total glacier covered area decreased by∼8.2±1.5%(0.16±0.03%yr-1)during the entire observation period 1971–2020,with noticeable heterogeneity between tributary *** the past two decades(2000–2020),the deglaciation rate has increased significantly(0.25%yr-1)compared to the previous decades(1971–2000;0.12%yr-1).Glacier lake area increased by 0.6±0.1 km^(2)(0.012 km^(2)yr-1)between 1971 and *** NCEP/NCAR climatic data reveals an increase of 0.63℃in temperature and a decrease of 6.39 mm in precipitation for the period 1948–*** comparison,APHRODITE data shows an increasing trend in temperature of 1.14℃between 1961 and 2015 and decreasing trend in precipitation of 31 mm between 1951 and *** NCEP/NCAR and APHRODITE data reveal significant temperature increase and precipitation decrease since the 1990s,which have probably augmented ice loss in the Bhaga basin during the early 21st century.

关键词： Glacier change Remote sensing APHRODITE NCEP/NCAR reanalysis Climate change Western Himalaya