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Computer Modelling of Compact 28/38 GHz Dual-Band Antenna for Millimeter-Wave 5G Applications

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Computer Modeling in Engineering & Sciences 2023年第12期137卷 2867-2879页

作者： Amit V.Patel arpan desai Issa Elfergani Hiren Mewada Chemseddine Zebiri Keyur Mahant Jonathan Rodriguez Raed Abd-Alhameed Department of Electronics and Communication Engineering Chandubhai S Patel Institute of Technology(CSPIT)Charotar University of Science and Technology(CHARUSAT)Changa388421India The Instituto de Telecomunica珲es Campus Universitário de SantiagoAveiro3810-193Portugal School of Engineering and Informatics University of BradfordBradfordBD71DPUK Electrical Engineering Department Prince Mohammad Bin Fahd UniversityAl Khobar31952Saudi Arabia Department of Electronics Laboratoire d’Electronique de Puissance et Commande Industrielle(LEPCI)University of Ferhat AbbasSétif19000Algeria

A four-element compact dual-band patch antenna having a common ground plane operating at 28/38 GHz is proposed formillimeter-wave communication systems in this ***-input-multiple-output(MIMO)antenna geometry consists of a slotted ellipse enclosed within a hollow circle which is orthogonally rotated with a connected partial ground at the *** overall size of the four elements MIMO antenna is 2.24λ×2.24λ(at 27.12GHz).The prototype of four-element MIMOresonator is designed and printed using Rogers RTDuroid 5880 withε_(r)=2.2 and loss tangent=0.0009 and having a thickness of 0.8 *** covers dual-band having a fractional bandwidth of 15.7%(27.12-31.34 GHz)and 4.2%(37.21-38.81 GHz)for millimeter-wave applications with a gain of more than 4 dBi at both *** proposed antenna analysis in terms ofMIMOdiversity parameters(Envelope Correlation Coefficient(ECC)and Diversity Gain(DG))is also carried *** experimental result in terms of reflection coefficient,radiation pattern,gain and MIMOdiversity parameter correlates very well with the simulated ones that show the potential of the proposed design for MIMO applications at millimeter-wave frequencies.

关键词： Connected ground diversity parameters dual-band antenna fifth generation(5G) mmwave multiple input multiple output(MIMO)

Sensitivity Analysis of Contact Type Vibration Measuring Sensors

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Sound & Vibration 2022年第3期56卷 235-243页

作者： Mohit Dhanda Pankaj Pant Sourabh Dogra arpan Gupta Varun Dutt School of Engineering Indian Institute of TechnologyMandi175005India National Institute of Technology Hamirpur177001India School of Computing and Electrical Engineering Indian Institute of TechnologyMandi175005India

With the Internet of Things(IoT)era dawning in,we are surrounded by a plethora of *** present paper focuses on MEMS-based vibration measuring accelerometers,which are ubiquitously present in smartphones,tablets,smartwatches/bands,*** contact type vibration sensors have the unique advantage of being very small,low cost,low power,less weighing,and easily accommodatable in ***,the accuracy of these sensors needs to be quantified with respect to more accurate *** this objective,the paper presents a comparison of the relative sensitivity of a MEMS-based accelerometer(MPU 6050),a Geophone,and a sensor from Xiaomi Y2 smartphone with respect to a more standard Piezoelectric ICP based accelerometer,when all sensors are tested on a shaker *** are measured with harmonic excitation over a frequency range of 2–184 *** relative sensitivity of MPU 6050 was 90%accurate in the frequency range 18–116 Hz for RMS *** sensors such as the one used in the Xiaomi Y2 smartphone and the Geophone were less *** relative sensitivity measured in this work can be used to obtain sensitivity and hence more accurate data from these low-cost accelerometers.

关键词： MEMS sensor frequency sensitivity

Maximization of Acoustic Levitating Force for a Single-Axis Acoustic Levitation System Using the Finite Element Method

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Chinese Physics Letters 2019年第3期36卷 49-52页

作者： Saurabh Yadav arpan Gupta Acoustic and Vibration Laboratory School of Engineering Indian Institute of Technology Mandi

We investigate single-axis acoustic levitation using standing waves to levitate particles freely in a medium bounded by a driver and a reflector. The acoustic pressure at the pressure antinode of the standing wave counteracts the downward gravitational force of the levitating object. The optimal relationship between the air gap and the driving frequency leads to resonance and hence maximization of the levitating force. Slight deviation from the exact resonance condition causes a reduction in acoustic pressure at the pressure antinodes. This results in a significant reduction of the levitating force. The driving frequency is kept constant while the air gap is varied for different conditions. The optimal air gap for maximizing the levitation force is studied for first three resonance modes. Furthermore, a levitating particle is introduced between the driver and the reflector. The dependence of the resonance condition on the size of the levitating particle as well as the position of the particle between the driver and the reflector has also been studied. As the size of the levitating particle increases, the resonance condition also gets modified. Finite element results show a good agreement with the validated results available in the literature. Furthermore, the finite element approach is also used to study the variation of acoustic pressure at the pressure antinode with respect to the size of the reflector. The optimum diameter of the reflector is calculated for maximizing the levitating force for three resonance modes.

关键词： Maximization Levitating Acoustic Levitation Method

Atomically precise thiolate-protected gold nanoclusters:Current status of designability of the structure and physicochemical properties

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聚集体(英文) 2023年第2期4卷 1-41页

作者： Sakiat Hossain Daisuke Hirayama Ayaka Ikeda Mai Ishimi Sota Funaki arpan Samanta Tokuhisa Kawawaki Yuichi Negishi Research Institute for Science and Technology Tokyo University of ScienceShinjuku-kuJapan Department of Applied Chemistry Faculty of ScienceTokyo University of ScienceShinjuku-kuJapan

Thiolate(SR)-protected gold nanoclusters(Aun(SR)m NCs)are a rare type of material capable of simultaneously exhibiting multiple physicochemical properties well-suited to specific applications,including photoluminescence,thermocatalysis,electrocatalysis,photocatalysis,magnetism,and optical *** the past several decades,there has been tremendous progress in our understanding of the structure and physicochemical properties of Aun(SR)m NCs,resulting in the ability to fine-tune the characteristics of these *** is therefore helpful to examine the extent to which the properties of Aun(SR)m and related metal NCs can now be adjusted based on *** review presents representative examples of previous studies concerning the geometry,electronic structure,luminescence properties,catalysis,magnetism and optical activity of Aun(SR)m and related metal NCs and discusses the current status of the designability of these NCs to impart specific structural and physicochemical *** information is expected to accelerate the fabrication of highly functional materials based on Aun(SR)m and related metal NCs.

关键词： atomically precise metal nanoclusters gold nanoclusters physicochemical properties structures thiolate

Development of a mass model in estimating weight-wise particle size distribution using digital image processing

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International Journal of Mining Science and Technology 2017年第3期27卷 435-443页

作者： Maiti Abhik Chakravarty Debashish Biswas Kousik Halder arpan Department of Mining Engineering Indian Institute of Technology Kharag-pur 721302 India

Particle size distribution of coarse aggregates through mechanical sieving gives results in terms of cumulative mass percent. But digital image processing generated size distribution of particles, while being fast and accurate, is often expressed in terms of area function or number of particles. In this paper, a mass model is developed which converts the image obtained size distribution to mass-wise distribution, making it readily comparable to mechanical sieving data. The concept of weight/particle ratio is introduced for mass reconstruction from 2D images of particle aggregates. Using this mass model, the effects of several particle shape parameters(such as major axis, minor axis, and equivalent diameter) on sieve-size of the particles is studied. It is shown that the sieve-size of a particle strongly depend upon the shape parameters, 91% of its variation being explained by major axis, minor axis, bounding box length and equivalent diameter. Furthermore, minor axis gives an overall accurate estimate of particle sieve-size, error in mean size(D-50) being just 0.4%. However, sieve-size of smaller particles(20 mm) are highly correlated to their equivalent diameters. Multiple linear regression analysis has been used to generate overall mass-wise particle size distribution, considering the influences of all these shape parameters on particle sieve-size. Multiple linear regression generated overall mass-wise particle size distribution shows a strong correlation with sieve generated data. The adjusted R-square value of the regression analysis is found to be 99 percent(w.r.t cumulative frequency). The method proposed in this paper provides a time-efficient way of producing accurate(up to 99%) mass-wise PSD using digital image processing and it can be used effectively to replace the mechanical sieving.

关键词：数字图像处理法颗粒分布质量模型重量估计回归分析方法多元线性回归粒子尺寸

Targeted therapy in chronic diseases using nanomaterial-based drug delivery vehicles

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Signal Transduction and Targeted Therapy 2019年第1期4卷 389-409页

作者： Akhand Pratap Singh arpan Biswas Aparna Shukla Pralay Maiti School of Materials Science and Technology Indian Institute of Technology(BHU)Varanasi 221005India

The application of nanomedicines is increasing rapidly with the promise of targeted and efficient drug *** address the shortcomings of conventional therapy,as evidenced by several preclinical and clinical investigations indicating site-specific drug delivery,reduced side effects,and better treatment *** development of suitable and biocompatible drug delivery vehicles is a prerequisite that has been successfully achieved by using simple and functionalized liposomes,nanoparticles,hydrogels,micelles,dendrimers,and mesoporous particles.A variety of drug delivery vehicles have been established for the targeted and controlled delivery of therapeutic agents in a wide range of chronic diseases,such as diabetes,cancer,atherosclerosis,myocardial ischemia,asthma,pulmonary tuberculosis,Parkinson’s disease,and Alzheimer’s *** successful outcomes in preclinical and clinical trials,many of these drugs have been marketed for human use,such as Abraxane®,Caelyx®,Mepact®,Myocet®,Emend®,and Rapamune®.Apart from drugs/compounds,novel therapeutic agents,such as peptides,nucleic acids(DNA and RNA),and genes have also shown potential to be used as nanomedicines for the treatment of several chronic ***,a large number of extensive clinical trials are still needed to ensure the short-term and long-term effects of nanomedicines in *** review discusses the advantages of various drug delivery vehicles for better understanding of their utility in terms of current medical ***,the application of a wide range of nanomedicines is also described in the context of major chronic diseases.

关键词： drugs ischemia treatment

Influence of Tacking Sequence on Residual Stress and Distortion of Single Sided Fillet Submerged Arc Welded Joint

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Journal of Marine Science and Application 2015年第3期14卷 250-260页

作者： arpan Kumar Mondal Pankaj Biswas Swarup Bag Department of Mechanical Engineering Indian Institute of Technology Guwahati Guwahati 781039 India

沉没弧焊(锯) 为由于高材料免职率在大结构加入高厚度材料是有益的。不一致的加热并且冷却产生热压力，随后，剩余强调并且失真。纵、横向的剩余压力和尖失真通常在焊接的沉没的弧的大面板结构被测量切关节。因此，这个现在的工作的目... 详细信息

沉没弧焊(锯) 为由于高材料免职率在大结构加入高厚度材料是有益的。不一致的加热并且冷却产生热压力，随后，剩余强调并且失真。纵、横向的剩余压力和尖失真通常在焊接的沉没的弧的大面板结构被测量切关节。因此，这个现在的工作的目的是确定剩余应力和失真在并且在由于 stiffeners 钉放联合的焊接附近的数量。剩余应力并且附加的合适的控制的水平定序的附加顺序影响被要求最小化压力。在现在的学习， elasto 塑料的材料行为被认为开发预言剩余压力和尖失真，变化附加的机械模型定序的 thermo。模仿的结果表明附加顺序重重地影响剩余压力和单身者的变丑模式站在一起切关节。有限元素基于数字模型被从出版文学比较试验性的数据校准。从今以后，尖失真从内部地发达的试验性的安装被测量。一个公平协议在之间预言并且试验性的结果显示发达数字模型的坚韧性。然而，从现在的学习的最重要的结论声明那个钉焊接位置应该被放在对面到 fillet 焊接方面到最小化剩余应力。

关键词：残余应力焊接接头应力和埋弧焊角变形弹塑性材料模型预测实验数据

Zn-doped nickel iron(oxy)hydroxide nanocubes passivated by polyanions with high catalytic activity and corrosion resistance for seawater oxidation

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Journal of Energy Chemistry 2023年第6期81卷 82-92,I0004页

作者： So Jung Kim Heechae Choi Jeong Ho Ryu Kang Min Kim Sungwook Mhin arpan Kumar Nayak Junghwan Bang Minyeong Je Ghulam Ali Kyung Yoon Chung Kyeong-Han Na Won-Youl Choi Sunghwan Yeo Jin Uk Jang HyukSu Han Department of Energy Engineering Konkuk University120 Neungdong-roGwangjin-guSeoul 05029Republic of Korea Theoretical Materials&Chemistry Group Institute of Inorganic ChemistryUniversity of CologneGreinst.650939CologneGermany Materials Lab Geobuk-ro 25-50Incheon 22793Republic of Korea Department of Materials Science and Engineering Korea National University of Transportation50 Daehak-roChungjuChungbuk 27469Republic of Korea Korea Institute of Industrial Technology 137-41 Gwahakdanji-roGangneung-siGangwon 25440Republic of Korea Department of Advanced Materials Engineering Kyonggi UniversitySuwon 16227Republic of Korea Korea Institute of Industrial Technology 156 Gaetbeol-roYeonsu-guIncheon 406-840Republic of Korea U.S.-Pakistan Center for Advanced Studies in Energy(USPCASE) National University of Sciences and Technology(NUST)H-12IslamabadPakistan Energy Storage Research Center Korea Institute of Science and TechnologyHwarang-ro 14-gil 5Seongbuk-guSeoul 02792Republic of Korea Division of Energy and Environment Technology KIST SchoolKorea University of Science and TechnologySeoul 02792Republic of Korea Department of Metal and Materials Engineering Gangneung-Wonju National University 7 JukheongilGangneungGangwon 25457Republic of Korea Smart Hydrogen Energy Center Gangneung-Wonju National University7 JukheongilGangneungGangwon 25457Republic of Korea Innovative Fuel Development Division Korea Atomic Energy Research InstituteDaedeok-daero 989-111Yuseong-guDaejeon 305-353Republic of Korea

Electrochemical water splitting to produce hydrogen fuel is a promising renewable energy-conversion ***-scale electrolysis of freshwater may deplete water resources and cause water scarcity ***,seawater electrolysis is a potential solution to the future energy and water *** seawater electrolysis,it is critical to develop cost-effective electrocatalysts to split seawater without chloride ***,we present zinc-doped nickel iron(oxy)hydroxide nanocubes passivated by negatively charged polyanions(NFZ-PBA-S)that exhibits outstanding catalytic activity,stability,and selectivity for seawater *** dopants and polyanion-rich passivated surface layers in NFZ-PBA-S could effectively repel chlorine ions and enhance corrosion resistance,enabling its excellent catalytic activity and stability for seawater oxidation.

关键词： Seawater splitting Oxygen evolution reaction Electrocatalyst Layered double hydroxide Sulfidation

Diagnostic Prospectives with Tau Protein and Imaging Techniques to Detect Development of Chronic Traumatic Encephalopathy

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Journal of Behavioral and Brain Science 2023年第4期13卷 55-65页

作者： Amit Naskar Danielle Jayanty Kimberly Head Gulshan L. Khanna Vatsalya Vatsalya arpan Banerjee Cognitive Brain Dynamics Lab National Brain Research Centre Manesar India Department of Medicine University of Louisville Louisville KY USA Professor and Pro Vice Chancellor Manav Rachna International Institute of Research and Studies Faridabad India Robley Rex VA Medical Center Louisville KY USA National Institute on Alcohol Abuse and Alcoholism NIH Bethesda MD USA

Brain damage sustained from repeated blows in boxing, wrestling, and other combat sports has serious physical and mental health consequences. The degenerative brain disease, chronic traumatic encephalopathy (CTE), presents clinically with memory loss, aggression, difficulty in rational thinking and other cognitive problems. This spectrum, which mimics Alzheimer’s disease, is diagnosed post-mortem through a brain biopsy in many professional athletes. However, little is known about the process of development and how to identify vulnerable individuals who may be on course for developing CTE. Boxing is a sport that has a severe toll on athletes’ health, primarily on their brain health and function. This review addresses the concerns of brain injury, describes the pathologies that manifest in multiple scales, e.g., molecular and cognitive, and also proposes possible diagnostic and prognostic markers to characterize the early onset of CTE along with the aim to identify a starting point for future precautions and interventions.

关键词： Athletes Axonal Injury Tau Protein Chronic Traumatic Encephalopathy Traumatic Brain Injury Boxing Wrestling