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Designing a clean and efficient air conditioner with AI intervention to optimize energy-exergy interplay

Energy and AI 2020年第2期2卷 101-115页

作者： Pranaynil Saikia Gaurav dibakar rakshit Centre for Energy Studies Indian Institute of Technology DelhiHauz KhasNew Delhi 110016India Mechanical Engineering Department Mewat Engineering CollegeNuhHaryana 122107India The University of Queensland Australia

Conventional refrigerants in air conditioners(A/Cs)although deliver localized comfort within dwellings,their overall detrimental impact on the environment is an alarming *** study investigates eco-friendly alter-natives to the refrigerants R410A and R22(which contribute to global warming and ozone depletion)through a comprehensive analysis of salient parameters such as coefficient of performance(COP),volumetric cooling capacity,and exergetic efficiency(η_(ex))featuring a sustainably retrofitted vapor compression based A/*** thermophysical properties of alternate refrigerants yield multiple options for contriving a sustainable A/***-formance enhancement of the retrofitted system is then realized through a multifaceted genetic algorithm(GA)coupled with an artificial neural network(ANN).Subsequently,the incongruence of optimality between maxi-mum system COP and maximum𝜂ex is dealt by a dual ANN powered non dominated sorting genetic algorithm-2(NSGA-2)optimizer which provides balanced output in terms of COP(4.37 for L20a and 4.238 for ARM71a refrig-erant respectively)and η_(ex)(26.208% for L20a and 25.413% for ARM71a refrigerant respectively).The artificial intelligence(AI)based approach helps comprehend the trade-off between different system performance indices(having different units/ranges of variation)during optimum design ***,the data-driven sur-rogate model reveals the dominating effect of energy performance over exergy performance of the system,urging for the higher priority of resource allocation for COP upgrade than𝜂η_(ex) ***,the multi-objective op-timization yields a broader set of Pareto optimal points which offer flexibility to the stakeholders to thrust the sustainable system towards higher COP or higher η_(ex) mode of operation.

关键词： Refrigerant Machine learning Energy Exergy Artificial neural network Genetic algorithm

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Interlayer shear of nanomaterials:Graphene–graphene,boron nitride–boron nitride and graphene–boron nitride

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Acta Mechanica Solida Sinica 2017年第3期30卷 234-240页

作者： Yinfeng Li Weiwei Zhang Bill Guo dibakar Dattac Department of Engineering Mechanics School of Naval Architecture Ocean and Civil Engineering (State Key Laboratory of Ocean Engineering Collaborative Innovation Center for Advanced Ship and Deep-Sea Exploration) Shanghai Jiao Tong University Shanghai 200240 China Department of Materials Science and Engineering University of Pennsylvania Philadelphia PA 19104 USA Department of Mechanical and Industrial Engineering Newark College of Engineering New Jersey Institute of Technology Newark NJ 07102 USA Key Laboratory for Intelligent Nano Materials and Devices of the Ministry of Education Nanjing University of Aeronautics and Astronautics Nanjinq 210016 China

In this paper, the interlayer sliding between graphene and boron nitride （h-BN） is studied by molecular dynamics simulations. The interlayer shear force between h-BN/h-BN is found to be six times higher than that of graphene/graphene, while the interlayer shear between graphene/h-BN is approximate to that of graphene/graphene. The graphene/h- BN heterostructure shows several anomalous interlayer shear characteristics compared to its bilayer counterparts. For graphene/graphene and h-BN/h-BN, interlayer shears only exit along the sliding direction while interlayer shear for graphene/h-BN is observed along both the translocation and perpendicular directions. Our results provide significant insight into the interlayer shear characteristics of 2D nanomaterials.

关键词： Friction Interlayer shear Graphene Hexongal boron nitride Molecular dynamics

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The roles of MXenes in developing advanced lithium metal anodes

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Journal of Energy Chemistry 2022年第6期31卷 132-149,I0005页

作者： Nicolas Lucero Dayannara Vilcarino dibakar Datta Meng-Qiang Zhao Department of Chemical and Materials Engineering Newark College of EngineeringNew Jersey Institute of TechnologyNewarkNJ 07103USA Jose Marti Stem Academy Union CityNJ 07087USA Department of Mechanical and Industrial Engineering Newark College of EngineeringNew Jersey Institute of TechnologyNewarkNJ 07103USA

Lithium(Li) metal has emerged as the most promising anode for rechargeable Li batteries owing to its high theoretical specific capacities, low negative electrochemical potential, and superior electrical conductivity. Replacing the conventional graphite anodes with Li metal anodes(LMAs) provides great potential to exceed the theoretical limitations of current commercial Li-ion batteries, leading to nextgeneration high-energy–density rechargeable Li metal batteries(LMBs). However, further development of LMAs is hindered by several inherent issues, such as dangerous dendrite growth, infinite volume change, low Coulombic efficiency, and interfacial side reactions. MXenes, a family of two-dimensional(2 D) transition metal carbides and/or nitrides, have recently attracted much attention to address these issues due to their 2D structure, lithiophilic surface terminations, excellent electrical and ionic conductivity, and superior mechanical properties. Herein, an overview of recent advances in the roles of MXenes for stabilizing LMAs is presented. In particular, strategies of utilizing MXenes as the Li hosts, artificial protection layers, electrolyte additives, and for separator modifications to develop stable and dendrite-free LMAs are discussed. Moreover, a perspective on the current challenges and potential outlooks on MXenes for advanced LMAs is provided.

关键词： MXenes 2D materials Lithium dendrites Lithium metal anodes Stability

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Evaluation of dehydration loss and investigation of its effect on bending response of segmented IPMC actuators

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International Journal of Smart and Nano Materials 2010年第3期1卷 187-200页

作者： Dillip Kumar Biswal dibakar Bandopadhya Santosha Kumar Dwivedy Department of Mechanical Engineering Indian Institute of TechnologyGuwahatiAssam-781039India

Efforts were made to estimate and analyze the effect of dehydration on the bending response of segmented ionic polymer-metal composite(IPMC)*** experiment was conducted with an IPMC actuator to study the variation of bending characteristics with input *** on the experimental data,the Cobb-Douglas production method was used to obtain the dehydration factor in terms of input voltage and *** motion of the patches was restricted to planar in two dimensions.A single-patch IPMC actuator was then modeled following the Euler-Bernoulli approach incorporating loss due to dehydration.A forward kinematics model for the segmented actuators was formulated after constituting the homogeneous coordinate transformation matrix,assuming it is a serial link multi-degree of freedom *** energy-based dynamic model of the patches was derived using the Lagrange *** were performed for single and two segmented IPMC patches to demonstrate the bending response for various input *** results demonstrate the gradual reduction of bending response of an actuator owing to moisture loss.

关键词： ionic polymer-metal composite(IPMC) Lagrange principle dehydration factor

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Distribution of geochemical fractions of phosphorus and its ecological risk in sediment cores of a largest brackish water lake, South Asia

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International Journal of Sediment Research 2019年第3期34卷 251-261页

作者： Saroja Kumar Barik Satyanarayan Bramha Tapan Kumar Bastia dibakar Behera Pratap Kumar Mohanty Prasanta Rath School of Applied Sciences Department of Chemistry KIIT University Health Safety and Environment Group Indira Gandhi Centre for Atomic Research Department of Atomic Energy Government of India Department of Marine Sciences Berhampur University

The current study focuses on the vertical profile of different geochemical fractions of phosphorus-loosely bound(Lo–P), aluminium bound(Al–P), iron bound(Fe–P), calcium bound(Ca–P), and organic bound phosphorus(O–P) along with ecological risk assessment of sediment cores from Chilika Lake, eastcoast of India. The percentage contribution of the different fractions to the sedimentary phosphorus in the sediment column of the whole lake are on the order: O–P(33.2%) 4 Ca–P(20.3%) 4 Fe–P(18%) 4 Al–P(6.7%) 4 Lo–P(0.35%). The Phosphorus Pollution Index(PPI) revealed the contamination of lake sediment with phosphorus. The principal component and cluster analyses highlighted the anthropogenic contribution of phosphorus. The negative loading of Ca–P with Ca points towards its origin from marine shells. The discriminate analysis showed that the variables like Ca–P, bio-available phosphorus(BAP), and p H were able to effectively discriminate the sectors in a significant manner.

关键词： Phosphorus fractions Ecological risk Sediment core Chilika Lake

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Fabrication and characterization of the Ti-Ca-P composites by vacuum sintering

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Journal of Biomedical Science and Engineering 2011年第9期4卷 583-590页

作者： dibakar Mondal Swapan Kumar Sarkar Dong-Won Lee Young-Seon Lee Byong-Taek Lee 不详

Using Ti and biphasic calcium phosphate (BCP) pow-ders, Ti-Ca-P composites which contained 0 - 30 vol.% BCP powders initially, were fabricated by vac-uum sintering at two different sintering temperatures, 1300°C and 1400°C. Detailed microstructural char-acteristics of the resulting composites were investi-gated. Mechanical properties like compressive strength, Vickers hardness were evaluated and they showed decreasing trend with the increasing initial BCP content. The x-ray diffraction (XRD) profiles revealed that extensive chemical reaction occurred and the initial BCP was degraded and formed CaO, TiO2, TiP, CaTiO3. However, the cell viability by MTT assay and cell proliferation behavior through one cell morphology analysis showed excellent in-creasing trend in biocompatibility which makes this materials suitable for hard tissue aid *** the composite containing 30 vol.% BCP content with Ti sintered at 1400°C showed excellent biocompati-bility with the Vickers Hardness value 108.8 HV and the compressive strength value 303.7 MPa.

关键词： Ti Calcium Phosphate Biocompatibility Bio-ceramic

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表面修饰对纳米材料力学性能及生物行为的调控与机理表征

表面修饰对纳米材料力学性能及生物行为的调控与机理表征

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中国力学大会-2015

作者：李寅峰 Huajian Gao Datta dibakar 上海交通大学工程力学系 School of Engineering Brown University

研究了表面修饰对纳米材料力学性能及其在生物膜系统中行为规律的调控和机理,提高纳米材料在各领域的应用潜力和生物安全.研究了表面改性影响纳米材料与生物细胞膜解除作用的行为规律和机制,采用分子动力学粗粒化模型模拟表面改性的纳...

研究了表面修饰对纳米材料力学性能及其在生物膜系统中行为规律的调控和机理,提高纳米材料在各领域的应用潜力和生物安全.研究了表面改性影响纳米材料与生物细胞膜解除作用的行为规律和机制,采用分子动力学粗粒化模型模拟表面改性的纳米材料穿透细胞膜进入细胞的动态过程,并在纳米生物系统中创新融合热力学积分方法,得到纳米材料穿膜过程伴随的系统自由能变化.

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利用条件自回归模型对宏观状态下的自行车碰撞事件进行空间分析

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伤害医学（电子版） 2018年第4期7卷 49-55页

作者：何晓艺李丽萍 dibakar Saha Priyanka Alluri Albert Gan Wanyang Wu

根据美国国家公路交通安全管理局(the nation-al highway traffic safety administration,NHTSA)资料显示,目前美国的自行车通勤量增加了60%以上。然而,近年来骑自行车者的安全风险也呈上升趋势。佛罗里达州2015年自行车事故死亡人数为... 详细信息

根据美国国家公路交通安全管理局(the nation-al highway traffic safety administration,NHTSA)资料显示,目前美国的自行车通勤量增加了60%以上。然而,近年来骑自行车者的安全风险也呈上升趋势。佛罗里达州2015年自行车事故死亡人数为150人,是2010年的1.8倍。总的来说,佛罗里达州在2010—2015年期间以755起行车死亡案例数居全美前列。这些严峻的统计数据强调需要对佛罗里达州的自行车碰撞事故进行深入调查分析[1]。

关键词：骑自行车自回归模型空间分析碰撞状态宏观交通安全管理佛罗里达

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不均匀多孔垂直板的波浪响应（英文）

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Journal of Marine Science and Application 2024年第4期 867-876页

作者： Shreya Banerjee dibakar Mondal Sudeshna Banerjea Department of Mathematics Jadavpur University Department of Mathematics Government General Degree College at Kalna-I

This paper is concerned with a study of wave propagation due to scattering of an obliquely incident wave by a porous vertical plate with nonuniform porosity which is completely submerged in water of finite depth. The problem is formulated in terms of a Fredholm integral equation of the second kind in difference in potential across the barrier. The integral equation is then solved using two methods: the boundary element method and the collocation method. The reflection coefficients, transmission coefficient, and amount of energy dissipation are evaluated using the solution of the integral equation. It is observed that non-uniform porosity of a barrier has significant effect on the reflection of waves and energy dissipation compared to a barrier with uniform porosity. The dissipation of the wave energy by a non-uniform porous barrier can be enhanced and can be made larger than that of a barrier with uniform porosity, by suitable choice of non-uniform porosity distribution in the barrier. This has an important bearing on reducing the wave power and thereby protecting the shore line from coastal erosion. Also, an obliquely incident wave reduces reflection and dissipation while increasing transmission of wave energy as compared to a normally incident wave.

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