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High-temperature infrared camouflage with efficient thermal management

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Light(Science & Applications) 2020年第1期9卷 1430-1437页

作者： Huanzheng Zhu Qiang Li Chunqi Zheng Yu Hong Ziquan Xu HanWang Weidong Shen sandeep kaur Pintu Ghosh Min Qiu State Key Laboratory of Modern Optical Instrumentation College of Optical Science and EngineeringZhejiang UniversityHangzhou 310027China Key Laboratory of 3D Micro/Nano Fabrication and Characterization of Zhejiang Province School of EngineeringWestlake University18 Shilongshan RoadHangzhou 310024China Institute of Advanced Technology Westlake Institute for Advanced Study18 Shilongshan RoadHangzhou 310024China

High-temperature infrared(IR)camouflage is crucial to the effective concealment of high-temperature objects but remains a challenging issue,as the thermal radiation of an object is proportional to the fourth power of temperature(T4).Here,we experimentally demonstrate high-temperature IR camouflage with efficient thermal *** combining a silica aerogel for thermal insulation and a Ge/ZnS multilayer wavelength-selective emitter for simultaneous radiative cooling(high emittance in the 5-8μm non-atmospheric window)and IR camouflage(low emittance in the 8-14μm atmospheric window),the surface temperature of an object is reduced from 873 to 410 *** IR camouflage is demonstrated by indoor/outdoor(with/without earthshine)radiation temperatures of 310/248 K for an object at 873/623 K and a 78% reduction in with-earthshine lock-on *** scheme may introduce opportunities for high-temperature thermal management and infrared signal processing.

关键词： thermal earth insulation

Color-preserving passive radiative cooling for an actively temperature-regulated enclosure

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Light(Science & Applications) 2022年第6期11卷 1130-1138页

作者： Yining Zhu Hao Luo Chenying Yang Bing Qin Pintu Ghosh sandeep kaur Weidong Shen Min Qiu Pavel Belov Qiang Lie State Key Laboratory of Modern Optical Instrumentation College of Optical Science and EngineeringZhejiang University310027 HangzhouChina Key Laboratory of 3D Micro/Nano Fabrication and Characterization of Zhejiang Province School of EngineeringWestlake University18 Shilongshan Road310024 HangzhouZhejiang ProvinceChina Institute of Advanced Technology Westlake Institute for Advanced Study18 Shilongshan Road310024 HangzhouZhejiang ProvinceChina Department of Physics and Engineering ITMO UniversitySaint PetersburgRussia

Active temperature control devices are widely used for the thermal management of enclosures,including vehicles and *** radiative cooling has been extensively studied;however,its integration with existing actively temperature regulated and decorative enclosures has slipped out of the research at status ***,we present a photonic-engineered dual-side thermal management strategy for reducing the active power consumption of the existing temperature-regulated enclosure without sacrificing its *** coating the exterior and interior of the enclosure roof with two visible-transparent films with distinctive wavelength-selectivity,simultaneous control over the energy exchange among the enclosure with the hot sun,the cold outer space,the atmosphere,and the active cooler can be implemented.A power-saving of up to 63%for active coolers of the enclosure is experimentally demonstrated by measuring the heat flux compared to the ordinary enclosure when the set temperature is around 26℃.This photonic-engineered dual-side thermal management strategy offers facile integration with the existing enclosures and represents a new paradigm toward carbon neutrality.

关键词： radiative passive preserving

Optimization of Cognitive Radio System Using Enhanced Firefly Algorithm

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Intelligent Automation & Soft Computing 2023年第9期37卷 3159-3177页

作者： Nitin Mittal Rohit Salgotra Abhishek Sharma sandeep kaur SSAskar Mohamed Abouhawwash University Center for Research and Development Chandigarh UniversityMohaliPunjab140413India Faculty of Physics and Applied Computer Science AGH University of Science&TechnologyKrakowPoland Faculty of Information Technology Middle East UniversityAmman11813Jordan Department of Computer Engineering and Applications GLA UniversityMathura281406India Department of Computer Engineering&Technology Guru Nanak Dev UniversityAmritsarPunjab143005India Department of Statistics and Operations Research College of ScienceKing Saud UniversityP.O.Box 2455Riyadh11451Saudi Arabia Department of Computational Mathematics Science and EngineeringCollege of EngineeringMichigan State UniversityEast LansingMI48824USA Department of Mathematics Faculty of ScienceMansoura UniversityMansoura35516Egypt

The optimization of cognitive radio(CR)system using an enhanced firefly algorithm(EFA)is presented in this *** Firefly algorithm(FA)is a nature-inspired algorithm based on the unique light-flashing behavior of *** has already proved its competence in various optimization prob-lems,but it suffers from slow convergence *** improve the convergence performance of FA,a new variant named EFA is *** effectiveness of EFA as a good optimizer is demonstrated by optimizing benchmark functions,and simulation results show its superior performance compared to biogeography-based optimization(BBO),bat algorithm,artificial bee colony,and *** an application of this algorithm to real-world problems,EFA is also applied to optimize the CR *** is a revolutionary technique that uses a dynamic spectrum allocation strategy to solve the spectrum scarcity ***,it requires optimization to meet specific performance *** results obtained by EFA in CR system optimization are compared with results in the literature of BBO,simulated annealing,and genetic *** results further prove that the proposed algorithm is highly efficient and provides superior results.

关键词： Firefly algorithm cognitive radio bit error rate genetic algorithm simulated annealing biogeography-based optimization

Versus—A tool for evaluating visualizations and image quality using a 2AFC methodology

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Visual Informatics 2018年第4期2卷 225-234页

作者： Jenny Vuong sandeep kaur Julian Heinrich Bosco K.Ho Christopher J.Hammang Benedetta F.Baldi Seán I.O’Donoghue CSIRO Data61Australia Garvan Institute of Medical Research Australia University of New South Wales Australia University of Tübingen Germany University of Sydney Australia

Novel visualization methods and strategies are necessary to cope with the deluge of datasets present in any scientific field to make discoveries and find answers to previously unanswered *** methods and strategies should not only present scientific findings as images in a concise way but also need to be effective and expressive,which often remain ***,we present Versus,a tool to enable easy image quality assessment and image ranking,utilizing a two-alternative forced choice methodology(2AFC)and an efficient ranking algorithm based on a binary *** tool provides a systematic way of setting up evaluation experiments via the web without the necessity to install any additional software or require any programming ***,Versus can easily interface with crowdsourcing platforms,such as Amazon’s Mechanical Turk,or can be used as a stand-alone system to carry out evaluations with *** demonstrate the use of Versus by means of an image evaluation study,aiming to determine if hue,saturation,brightness,and texture are good indicators of uncertainty in three-dimensional protein *** from the power of crowdsourcing,we argue that there is demand and also great potential for this tool to become a standard for simple and fast image evaluations,with the aim to test the effectiveness and expressiveness of scientific visualizations.

关键词： Evaluation Visualization Visual analytics Image comparison Crowdsourcing Evaluation methods 2AFC Image evaluation Tool Visualization evaluation

Optimization of CMOS Repeater Driven Interconnect RC Line Using Genetic Algorithm

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Journal of Shanghai Jiaotong university(Science) 2017年第2期22卷 167-172页

作者： kaur Jasmeet GILL sandeep Singh kaur Navneet Department of Electronics and Communication Engineering Guru Nanak Dev Engineering CollegeLudhiana 141006India

In this work, optimization of complementary metal oxide semiconductor (CMOS) repeater driven interconnect resistive-capacitive (RC) line is carried out using genetic algorithm (GA). This work is aimed at powerdelay- product (PDP) minimization of RC interconnect at 180 nm technology node. The algorithm simultaneously optimizes the values of supply voltage, number of repeaters and repeater width for delay and PDP minimization. The accuracy of results obtained is verified by simulations from Cadence virtuoso tool. For delay minimization, comparison of GA results with previous results of the literature shows an improvement of 44.4% in the value of the optimal number of repeaters required. This improvement is obtained by increasing the repeater size, which also increases power dissipation, so a tradeoff has also been achieved in terms of PDP minimization. The comparison of PDP results obtained in this work, with the results at 70, 100, and 130 nm technologies from literature shows improvement in optimal number of repeaters required. The results of algorithm and simulations are in good agreement and demonstrate the validity of proposed algorithm. © 2017, Shanghai Jiaotong University and Springer-Verlag Berlin Heidelberg.

关键词： complementary metal oxide semiconductor(CMOS) genetic algorithm interconnects optimal power-delay-product repeater

A Middleware for Polyglot Persistence and Data Portability of Big Data PaaS Cloud Applications

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Computers, Materials & Continua 2020年第11期65卷 1625-1647页

作者： Kiranbir kaur sandeep Sharma Karanjeet Singh Kahlon Department of Computer Engineering and Technology Guru Nanak Dev UniversityAmritsar143001India Department of Computer Science and Applications Guru Nanak Dev UniversityAmritsar143001India

Vendor lock-in can occur at any layer of the cloud stack-Infrastructure,Platform,and *** paper covers the vendor lock-in issue at Platform as a Service(PaaS)level where applications can be created,deployed,and managed without worrying about the underlying *** applications and their persisted data on one PaaS provider are not easy to port to another *** overcome this issue,we propose a middleware to abstract and make the database services as *** middleware supports several SQL and NoSQL data stores that can be hosted and ported among disparate PaaS *** facilitates the developers with data portability and data migration among relational and NoSQL-based cloud *** databases are fundamental to endure Big Data applications as they support the handling of an enormous volume of highly variable data while assuring fault tolerance,availability,and *** implementation of the middleware depicts that using it alleviates the efforts of rewriting the application code while changing the backend database system.A working protocol of a migration tool has been developed using this middleware to facilitate the migration of the database(move existing data from a database on one cloud to a new database even on a different cloud).Although the middleware adds some overhead compared to the native code for the cloud services being used,the experimental evaluation on Twitter(a Big Data application)data set,proves this overhead is negligible.

关键词： Cloud computing platform as a service middleware polyglot persistence SQL NoSQL data migration tool Twitter data set

Evaluation of retinal nerve fiber layer thickness profile in thyroid ophthalmopathy without optic nerve dysfunction

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International Journal of Ophthalmology(English edition) 2016年第11期9卷 1634-1637页

作者： Kumari Mugdha Apjit kaur Neha Sinha sandeep Saxena Department of Ophthalmology King George's Medical University Lucknow 226003 India Sankara Eye Hospital Kanpur 208001 India

AIM： To evaluate retinal nerve fiber layer（RNFL）thickness profile in patients of thyroid ophthalmopathy with no clinical signs of optic nerve ***： A prospective, case-control, observational study conducted at a tertiary care centre. Inclusion criteria consisted of patients with eyelid retraction in association with any one of： biochemical thyroid dysfunction, exophthalmos, or extraocular muscle involvement; or thyroid dysfunction in association with either exophthalmos or extra-ocular muscle involvement;or a clinical activity score（CAS）〉3/7. Two measurements of RNFL thickness were done for each eye, by Cirrus HD-optical coherence tomography 6mo ***： Mean age of the sample was 38.75y（range13-70y） with 18 males and 22 females. Average RNFL thickness at first visit was 92.06 ±12.44 μm, significantly lower than control group（101.28±6.64 μm）（P =0.0001）.Thickness of inferior quadrant decreased from 118.2 ±21.27 μm to 115.0 ±22.27 μm after 6mo（P =0.02）. There was no correlation between the change in CAS and RNFL thickness. CONCLUSION： Decreased RNFL thickness is an important feature of thyroid orbitopathy, which is an inherent outcome of compressive optic neuropathy of any etiology. Subclinical RNFL damage continues in the absence of clinical activity of the disease. RNFL evaluation is essential in Grave＇s disease and active intervention may be warranted in the presence of significant damage.

关键词： thyroid ophthalmopathy retinal nerve fibrelayer optical coherence tomography

Empirical study of gum ghatti as an alternative thickening agent in hydraulic fracturing

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Petroleum 2022年第4期8卷 567-576页

作者： Prathamesh Sapale Vishesh Bhadariya sandeep Singh Rana Tondepu Subbaiah Mohammad Vaseem Chavhan Parinder kaur Vignan's Foundation for Science Technology&ResearchAndhra PradeshIndia Lovely Professional University PunjabIndia

Gum ghatti(anogeissus latifolia)is being widely used as an emulsifier,thickener,stabilizer in food,pharmaceutical,and allied industries due to its shelf life,tolerance of heat,and pH *** the oil&gas industry application,it is ideal for a hydraulic fracturing fluid additive as a direct replacement for guar ***,unlike guar gum,it contains less residual hull and it is suitable for low permeability unconventional reservoir;mainly shale gas reservoir,where permeability counts trivial in *** polymer of ghatti aid exceptional rheological properties and help to produce higher molecular weight polymer;which has excellent proppant carrying capacity and fracture *** this paper,the experimental study has been carried out in two different *** was achieved through optimization and characterization of hydraulic fracturing fluid which was embedded with gum *** Phase-I,the study was carried out by using response surface methodology(RSM).Wherein,the relation between several explanatory and response variables have been *** Phase-II,the characterization was done by using a scanning electron microscope(SEM),differential scanning calorimeter(DSC),thermo-gravimetric analysis(TGA)and also,Fourier-transform infrared spectroscopy(FTIR).This experimental study will potentially benefit for development of a new hydraulic fracturing *** gum ghatti observed as a satisfactory alternative agent for guar gum.

关键词： Hydraulic fracturing fluid Gum ghatti Rheological properties Polymer science Unconventional reservoir

High-yield synthesis and liquid-exfoliation of two- dimensional belt-like hafnium disulphide

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Nano Research 2018年第1期11卷 343-353页

作者： Harneet kaur sandeep Yadav Avanish K. Srivastava Nidhi Singh Shyama Rath Jorg J. Schneider Om P. Sinha Ritu Srivastava National Physical Laboratory Council of Scientific and Industrial Research Dr. K. S. Krishnan Road New Delhi I I O012 India Academy of Scientific and Innovative Research NPL New Delhi 110012 India Technische Universitat Darmstadt Eduard-ZintMnstitut f~r Anorganische und Physikalische Chemie 12 105 117 Alarich-Weiss-Str 12 64287 Darmstadt Germany DepartmentofPhysics andAstrophysics University of Delhi Delhi 110007 India Amity Institute of Nanotechnology Amity University UP Sector 125 Noida Uttar Pradesh 201313 India

Producing environmentally stable monolayers and few-layers of hafnium disulphide （HfS2） with a high yield to reveal its unlocked electronic and optoelectronic applications is still a challenge. HfS2 is a layered two-dimensional material of group-IV transition metal dichalcogenides. For the first time, we demonstrate a simple and cost-effective method to grow layered belt-like nanocrystals of HfS2 with a notably large interlayer spacing followed by their chemical exfoliation. Various microscopic and spectroscopic techniques confirm that these as-grown crystals exfoliate into single or multiple layers in a few minutes using solvent assisted ultrasonification method in N-cyclohexyl-2- pyrrolidone. The exfoliated nanosheets of HfS2 exhibit an indirect bandgap of 1.3 eV with high stability against surface degradation. Furthermore, we demonstrate that these nanosheets hold potential for electronic applications by fabricating a field-effect transistor based on few-layered HfS2, exhibiting a field-effect mobility of 0.95 cm2/（V.s） with a high on/off current modulation ratio of 10,000 in ambient conditions. The method is scalable and has a potential significance for both academic and industrial purposes.

关键词： two-dimensionalmaterials hafnium disulphide nano-crystals liquid-phase exfoliation environment-stabili~ field-effect transistor