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Waste Disposal and Sustainable Energy 2023年第2期5卷 151-163页

作者： krishna Bharathi Parimi Bhatti Sukhvinder Kaur Sathya Vara Prasad Lankapalli Jaikumar Sagari Department of Mechanical Engineering Andhra UniversityVisakhapatnamIndia Department of Mechanical Engineering GITAM Institute of TechnologyVisakhapatnamIndia

Renewable fuels have many advantages over fossil fuels because they are biodegradable and sustainable,and help mitigate social and environmental *** objective of the present study is to evaluate the performance,combustion,and emission characteristics of a compression–ignition engine using hydrogen compressed natural gas(HCNG)-enriched Kusum seed biodiesel blend(KSOBD20).The flow rate of HCNG was set at 5 L/min,10 L/min,and 15 L/min,and the injection pressure was varied in the range of 180 bar to 240 *** thermal efficiency(BTE)and brake-specific fuel consumption(BSFC)were improved when HCNG was added to the *** characteristics,namely,cylinder pressure(CP)and net heat release rate(NHRR),were also *** of carbon monoxide(CO),hydrocarbons(HC),and smoke were also reduced,with the exception of nitrogen oxides(NO_(x)).The higher injection pressure(240 bar)had a positive effect on the operating *** an injection pressure of 240 bar,for KSOB20+15 L/min HCNG,the highest BTE and the lowest BSFC were found to be 32.09%and 0.227 kg/kWh,***,the CP and NHRR were 69.34 bar and 66.04 J/°.CO,HC,and smoke levels were finally reduced to 0.013%,47×10^(-6)and 9%,respectively,with NO_(x)levels at 1623×10^(-6).For optimum results in terms of engine characteristics,the fuel combination KSOBD20+15 L/min HCNG at FIP 240 bar is recommended.

关键词： Biodiesel Compressed natural gas Injection pressure Emission Cylinder pressure Brake thermal efficiency

Direct measurement of topological invariants in photonic superlattices

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Photonics Research 2022年第12期10卷 2901-2907页

作者： ZE-SHENG XU JUN GAO GOVIND krishna STEPHAN STEINHAUER VAL ZWILLER ANDALI W.ELSHAARI Department of Applied Physics Royal Institute of TechnologyAlbanova University Centre10691 StockholmSweden

Since the discovery of topological insulators,topological phases have generated considerable attention across the physics *** superlattices in particular offer a rich system with several degrees of freedom to explore a variety of topological characteristics and control the localization of *** their importance,characterizing topological invariants in superlattices consisting of a multi-band structure is challenging beyond the basic case of two-bands as in the Su–Schreifer–Heeger ***,we experimentally demonstrate the direct measurement of the topological character of chiral superlattices with broken inversion *** a CMOS-compatible nanophotonic chip,we probe the state evolving in the system along the propagation direction using novel nanoscattering *** employ a two-waveguide bulk excitation scheme to the superlattice,enabling the identification of topological zero-energy modes through measuring the beam *** measurements reveal quantized beam displacement corresponding to 0.088 and-0.245,in the cases of trivial and nontrivial photonic superlattices,respectively,showing good agreement with the theoretical values of 0 *** results provide direct identification of the quantized topological numbers in superlattices using a single-shot approach,paving the way for direct measurements of topological invariants in complex photonic structures using tailored excitations with Wannier functions.

关键词： topological invariants excitation

Carbon‐encapsulated anionic‐defective MnO/Ni open microcages: A hierarchical stress‐release engineering for superior lithium storage

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Carbon Energy 2023年第1期5卷 218-232页

作者： Jia Lin Yingying Peng Reddivari Chenna krishna Reddy Akif Zeb Xiaoming Lin Yan-Hui Sun Key Laboratory of Theoretical Chemistry of Environment Guangzhou Key Laboratory of Materials for Energy Conversion and StorageSchool of ChemistryMinistry of EducationSouth China Normal UniversityGuangzhouGuangdongPR China

Rational manipulation of multicomponent materials into a sophisticated architecture is a prerequisite for developing lithium‐ion ***,mechanical diffusion‐induced strain accumulation leads to sluggish diffusion kinetics and anomalous structure instability,further resulting in inferior long‐term cyclability and rate ***,the von Mises stress distribution on open microcages composed of secondary nanoparticles(OCNs)is mechanically investigated by finite element simulation,which elucidates the pronounced stress‐release effect on OCNs ***,a facile metal–organic framework‐derived methodology is proposed for constructing multihierarchical carbon‐encapsulated oxygen vacancy‐enriched MnO/Ni OCNs(OV‐MnO/Ni OCNs).Due to structural and compositional integration,the OV‐MnO/Ni OCNs achieve extraordinary lithium storage performance with excellent reversible capacity(1905.1 mAh g^(−1) at 0.2 A g^(−1)),ultrahigh cycling stability(1653.5 mAh g^(−1) at 2 A g^(−1) up to 600 cycles),and considerable rate capability(463.3 mAh g^(−1) even at 10 A g^(−1)).The primary lithium storage mechanisms are further systematically determined by experimental and theoretical *** enriched oxygen vacancies,metallic Ni configuration,and N‐doped carbonaceous matrix provide more active sites,construct omnidirectional diffusion pathways,suppress volume expansion,and boost electronic conductivity,thus yielding an exceptional diffusivity coefficient and expedited electrochemical *** study offers profound insights for the elaborate design of multicompositional electrodes into a mechanical stress‐release structure toward advanced energy storage application and development.

关键词： DFT calculations finite element simulation lithium-ion batteries metal–organic frameworks oxygen vacancies

Metal–Organic Frameworks and Their Derivatives as Cathodes for Lithium‑Ion Battery Applications:A Review

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Electrochemical Energy Reviews 2022年第2期5卷 312-347页

作者： R.Chenna krishna Reddy Xiaoming Lin Akif Zeb Cheng‑Yong Su Guangzhou Key Laboratory of Materials for Energy Conversion and Storage Key Laboratory of Theoretical Chemistry of EnvironmentMinistry of EducationSchool of ChemistrySouth China Normal UniversityGuangzhou 510006GuangdongChina China MOE Laboratory of Bioinorganic and Synthetic Chemistry Lehn Institute of Functional MaterialsSchool of ChemistrySun Yat-Sen UniversityGuangzhou 510275GuangdongChina

The development of energy storage technology is important for resolving the issues and challenges of utilizing sustainable green energy in modern-day *** an emerging technology,lithium-ion batteries(LIBs)are a common source of power for a wide variety of electronic devices,and major advances require the development and exploitation of new electrode materials;thus,fundamental knowledge of their atomic and nanoscale properties is *** moving beyond conven-tional cathode candidates,metal–organic frameworks(MOFs)chemistry provides an excellent direction for designing and developing promising high-performance cathode materials for use in ***,we carry out an overarching discussion on the development and application of MOFs and their derivatives as cathodes for lithium-ion battery applications.A timely overview of the exciting progress of MOFs as well as MOF-derived metallic components is *** unique char-acteristics of MOFs,such as their large surface area,high tunable porosity with uniform pore size,unique structural and morphological features,controllable framework composition and low densities,combine together to provide good interfacial charge transport properties and short diffusion lengths for electrons and/or ions that adequately support electrochemical redox *** progress of MOFs and their derived composites as cathode candidates for LIBs is emphasized based on their electrochemical results,while also discussing the remaining issues and potential upcoming research directions.

关键词： MOFs and their derived derivatives Li-ion batteries Cathodes Lithium storage

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

Improved deep mixed kernel randomized network for wind speed prediction

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Clean Energy 2023年第5期7卷 1006-1031页

作者： Vijaya krishna Rayi Ranjeeta Bisoi S.P.Mishra P.K.Dash Department of EEE GMR Institute of TechnologyRajamAndhra PradeshIndia Multidisciplinary Research Cell Siksha‘O’Anusandhan Deemed to be UniversityBhubaneswarOdishaIndia

Forecasting wind speed is an extremely complicated and challenging problem due to its chaotic nature and its dependence on several atmospheric *** there are several intelligent techniques in the literature for wind speed prediction,their accuracies are not yet very ***,in this paper,a new hybrid intelligent technique named the deep mixed kernel random vector functional-link network auto-encoder(AE)is proposed for wind speed *** proposed method eliminates manual tuning of hidden nodes with random weights and biases,providing prediction model generalization and representation *** reduces reconstruction error due to the exact inversion of the kernel matrix,unlike the pseudo-inverse in a random vector functional-link network,and short-ens the execution ***,the presence of a direct link from the input to the output reduces the complexity of the prediction model and improves the prediction *** kernel parameters and coefficients of the mixed kernel system are optimized using a new chaotic sine–cosine Levy flight optimization *** lowest errors in terms of mean absolute error(0.4139),mean absolute percentage error(4.0081),root mean square error(0.4843),standard deviation error(1.1431)and index of agreement(0.9733)prove the efficiency of the proposed model in comparison with other deep learning models such as deep AEs,deep kernel extreme learning ma-chine AEs,deep kernel random vector functional-link network AEs,benchmark models such as least square support vector machine,autoregressive integrated moving average,extreme learning machines and their hybrid models along with different state-of-the-art methods.

关键词： deep neural network mixed kernel random vector functional network auto-encoder chaotic sine-cosine Levy flight optimization single and multistep wind speed prediction

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

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