检索结果-南通市图书馆

Practical pulse engineering： Gradient ascent without matrix exponentiation

在线全文

学校读者我要写书评

暂无评论

Frontiers of physics 2018年第3期13卷 3-8页

作者： gaurav Bhole Jonathan A. Jones Centre for Quantum Computation Clarendon Laboratory University of Oxford Parks Road OX1 3PU UK

Since 2005, there has been a huge growth in the use of engineered control pulses to perform desired quantum operations in systems such as nuclear magnetic resonance quantum information processors. These approaches, which build on the original gradient ascent pulse engineering algorithm, remain computationally intensive because of the need to calculate matrix exponentials for each time step in the control pulse. In this study, we discuss how the propagators for each time step can be approximated using the Trotter-Suzuki formula, and a further speedup achieved by avoiding unnecessary operations. The resulting procedure can provide substantial speed gain with negligible costs in the propagator error, providing a more practical approach to pulse en-ineerinK.

关键词： quantum information coherent control pulse sequences in nuclear magnetic resonance

Unravelling the situation of malaria misdiagnosis in India:Its adverse impact and management strategies

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Asian Pacific Journal of Tropical Medicine 2022年第7期15卷 290-292页

作者： gaurav Kumar Hari Shankar ICMR-National Institute of Malaria Research Sector-8DwarkaDelhiIndia Indian Council of Medical Research New DelhiIndia

Malaria is a public health problem in several parts of India.A continuous decrease in malaria has been reported in India,from about 2.0 million cases in 2000 to about 0.2 million in 2020[1].In February 2016,the Government of India formally launched the National Framework for Malaria Elimination,which outlines the strategies for eliminating malaria from India by 2030[2].It aims to interrupt indigenous malaria transmission(zero indigenous case reporting)throughout the country,prevent the re-establishment of transmission in areas where it has been eliminated,and maintain national malaria-free status by 2030 and beyond,using the existing intervention tools and *** 2017,India launched its five-year National Strategic Plan for Malaria Elimination,which is mainly district focused rather than the National Framework for Malaria Elimination,which was state focused[3].India has shown a 71%reduction of malaria cases in 2019 compared to 2015,which was achieved by strengthening surveillance,improving diagnosis and treatment,and intensive vector control measures using existing *** India,Odisha state contributed 37.4%of total malaria cases in 2015,which was reduced to 12%in 2019 using the Durgama Anchalare Malaria Nirakaran initiative and comprehensive case management of malaria[4].

关键词： malaria Malaria India

Refinement modeling and verification of secure operating systems for communication in digital twins

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Digital Communications and Networks 2024年第2期10卷 304-314页

作者： Zhenjiang Qian Gaofei Sun Xiaoshuang Xing gaurav Dhiman School of Computer Science and Engineering Changshu Institute of TechnologySuzhou215500China University Centre for Research and Development Department of Computer Science and EngineeringChandigarh UniversityMohali140413India Department of Computer Science and Engineering Graphic Era Deemed to be UniversityDehradun248002India

In traditional digital twin communication system testing,we can apply test cases as completely as possible in order to ensure the correctness of the system implementation,and even then,there is no guarantee that the digital twin communication system implementation is completely *** verification is currently recognized as a method to ensure the correctness of software system for communication in digital twins because it uses rigorous mathematical methods to verify the correctness of systems for communication in digital twins and can effectively help system designers determine whether the system is designed and implemented *** this paper,we use the interactive theorem proving tool Isabelle/HOL to construct the formal model of the X86 architecture,and to model the related assembly *** verification result shows that the system states obtained after the operations of relevant assembly instructions is consistent with the expected states,indicating that the system meets the design expectations.

关键词： Theorem proving Isabelle/HOL Formal verification System modeling Correctness verification

Review of the crushing response of collapsible tubular structures

在线全文

学校读者我要写书评

暂无评论

Frontiers of Mechanical Engineering 2020年第3期15卷 438-474页

作者： Vivek PATEL gaurav TIWARI Ravikumar DUMPALA Department of Mechanical Engineering Visvesvaraya National Institute of TechnologyNagpur 440010India

Studies on determining and analyzing the crushing response of tubular structures are of significant interest,primarily due to their relation to *** aspects of tubular structures,such as geometry,material,configuration,and hybrid structure,have been used as criteria for *** this review,a comprehensive analysis of the important findings of extensive research on understanding the crushing response of thin-walled tubular structures is *** in thin-walled structures,including multi-cell tube,honeycomb and foam-filled,multi wall,and functionally graded thickness tubes,are also discussed,focusing on their energy absorption *** extensive review of experimentation and numerical analysis used to extract the deformation behavior of materials,such as aluminum and steel,against static and dynamic loadings are also *** tube shapes,such as tubes of uniform and nonuniform(tapered)cross sections of circular,square,and rectangular shapes,have been used in different studies to identify their *** from geometric and loading parameters,the effects of fabrication process,heat treatment,and triggering mechanism on initiating plastic deformation,such as cutouts and grooves,on the surface of tubular structures are discussed.

关键词： monolithic structure crashworthiness energy absorber static and dynamic loadings multicellular tube structure filled tube

Optimal inventory policies for short life cycle successive generations’ technology products

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Journal of Management Analytics 2022年第2期9卷 261-286页

作者： gaurav Nagpal Udayan Chanda Department of Management BITS PilaniPilani CampusPilaniRajasthan 333031India

In this paper,a new Economic Order Quantity(EOQ)model for a successive generation of technology products has been *** classical EOQ model is based on the assumption that the demand rate is *** it cannot be used for technology products where competition-substitution among products is a usual *** address this problem,the EOQ model proposed in this article is considered a demand model for a technology product that follows the innovation-diffusion process.A numerical example has been illustrated and a comprehensive sensitivity analysis is conducted to understand the path of the optimal planning horizon and optimal costs under varied innovation and imitation *** sensitivity analysis of the introduction timing of the second generation has been performed to know the applicability of the model in actual *** behavior of the model has been discussed in detail in the numerical illustration section.

关键词： Economic order quantity innovation diffusion technological innovations coefficient of innovation coefficient of imitation successive generations

Automated location correction and spot height generation for named summits in the coterminous United States

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

International Journal of Digital Earth 2020年第12期13卷 1570-1584页

作者： Samantha T.Arundel gaurav Sinha U.S.Geological Survey Center of Excellence for Geospatial Information ScienceRollaMOUSA Department of Geography Ohio UniversityAthensOHUSA

Spot elevations published on historical *** Survey topographic maps were established as needed to enhance information imparted by the quadrangle’s *** addition to other features,labels were routinely placed on mountain *** some elevations were established through field survey triangulation,many were computed during photogrammetric ***,Global Navigation Satellite System(GNSS)receivers have replaced expensive triangulation ***,since GNSS measurements require visiting the feature location,a national dataset containing high-accuracy spot elevations has not yet been ***,modern *** maps are devoid of mountain peak or other spot ***,topographic map users continue to demand the display of spot ***,a pilot study was conducted to evaluate the feasibility of automatically generating elevation values at named *** using available elevation *** devised method uses an uphill stepping technique to find the most likely highest point in subsequently higher-resolution elevation *** elevation values are compared to other published *** from 196 summits indicate that values derived from lidar are generally higher,whereas those populated from the one-third arcsecond USGS Seamless 3DEP elevation dataset are generally lower.A thorough understanding of these relationships require the evaluation of more points.

关键词： Spot height summits 3D elevation program geographic names

Different hybrid machine intelligence techniques for handling IoT-based imbalanced data

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

CAAI Transactions on Intelligence Technology 2021年第4期6卷 405-416页

作者： gaurav Mohindru Koushik Mondal Haider Banka Departtnent of Computer Science and Engjneetiiig HT(ISIM)DhanbadIndia Department of Computer Centre HT(ISM)DhanbadIndia

In the eta of automatic task processing or designing complex algorithms,to analyse data,it is always pertinent to find teal-life solutions using cutting-edge tools and techniques to generate insights into the *** data-driven machine learning models are now offering more or less worthy results when they are certainly balanced in the input data *** data occurs when an unequal distribution of classes occurs in the input *** a predictive model on the imbalanced data set would cause a model that appears to yield high accuracy but does not generalize well to the new data in the minority *** the time has come to look into the datasets which are not so-called Cbalanced,in nature but such datasets are generally encountered frequently in a *** prevent creating models with false levels of accuracy the imbalanced data should be rearranged before creating a predictive *** data are,sometimes,voluminous,heterogeneous and complex in nature and generate from different autonomous sources with distributed and decentralized *** driving force is to efficiently handle these data sets using latest tools and techniques for research and commercial *** present article provides different such tools and techniques,in different computing&ameworks,to handle such Internet of Things and other related datasets to review common techniques for handling imbalanced data in data ecosystems and offers a comparative data modelling framework in Keras for balanced and imbalanced datasets.

关键词： handle luminous offering

Virtual ballistic impact testing of Kevlar soft armor:Predictive and validated finite element modeling of the V0-V100 probabilistic penetration response

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Defence Technology（防务技术） 2018年第3期14卷 213-225页

作者： gaurav Nilakantan Suzanne Horner Virginia Halls James Zheng Teledyne Scientific&Imaging Thousand OaksCA 91360USA Program Executive Office Soldier Fort BelvoirVA 22060USA

This works presents the first fully validated and predictive capability to model the V_0-V_(100) probabilistic penetration response of a woven fabric using a yarn-level fabric finite element model. The V_0-V_(100) curve describes the probability of complete fabric penetration as a function of projectile impact velocity. The exemplar case considered in this paper comprises of a single-layer, fully-clamped, plain-weave Kevlar fabric impacted at the center by a 17-gr, 0.22 cal FSP or fragment-simulating projectile. Each warp and fill yarn in the fabric is individually modeled using 3 D finite elements and the virtual fabric microstructure is validated in detail against the experimental fabric microstructure. Material and testing sources of statistical variability including yarn strength and modulus, inter-yarn friction, precise projectile impact location, and projectile rotation are mapped into the finite element model. A series of impact simulations at varying projectile impact velocities is executed using LS-DYNA on the fabric models, with each model comprising unique mappings. The impact velocities together with the outcomes(penetration, nonpenetration) are used to generate the numerical V_0-V_(100) curve which is then validated against the experimental V_0-V_(100) curve. The numerical Vi-Vrdata(impact, residual velocities) is also validated against the experimental Vi-Vrdata. For completeness, this paper also reports the experimental characterization data and its statistical analysis used for model input, viz. the Kevlar yarn tensile strengths, moduli, and inter-yarn friction, and the experimental ballistic test data used for model validation.

关键词： Kevlar 有限元素测试数据验证概率预兆弹道虚拟

Assessment of the ballistic response of honeycomb sandwich structures subjected to offset and normal impact

在线全文

学校读者我要写书评

暂无评论

Defence Technology（防务技术） 2023年第10期28卷 56-73页

作者： Nikhil Khaire gaurav Tiwari Vivek Patel M.A.Iqbal Department of Mechanical Engineering Indian Institute of Technology DelhiNew Delhi110016India Department of Mechanical Engineering Visvesvaraya National Institute of TechnologyNagpur440026India School of Mechanical Engineering Dr.Vishwanath Karad MIT World Peace UniversityPune411038India Department of Civil Engineering Indian Institute of Technology RoorkeeRoorkee247667India

In the present study,experimental and numerical investigations were carried out to examine the behavior of sandwich panels with honeycomb *** high velocity impact tests were carried out using a compressed air gun.A sharp conical nosed projectile was impacted normally and with some offset distance(20 mm and 40 mm).The deformation,failure mode and energy dissipation characteristics were obtained for both kinds of ***,the explicit solver was run in Abaqus to create the finite element *** numerically obtained test results were compared with the experimental to check the accuracy of the *** numerical result was further employed to obtain strain energy dissipation in each element by externally running user-defined code in ***,the influence of inscribe circle diameter and cell wall and face sheet thickness on the energy dissipation,deformation and failure mode was *** result found that ballistic resistance and deformation were higher against offset impact compared to the normal impact *** panel impacted at 40 mm offset distance required 3 m/s and 1.9 m/s more velocity than 0 and 20 mm offset ***,increasing the face sheet and wall thickness had a positive impact on the ballistic resistance in terms of a higher ballistic limit and energy ***,inscribe circle diameter had a negative influence on the ballistic ***,the geometrical parameters of the sandwich structure had a significant influence on the energy dissipation in the different deformation *** energy dissipation in plastic work was highest for circumferential direction,regardless of impact condition followed by tangential,radial and axial directions.

关键词： Honeycomb sandwich structure Offset impact Energy dissipation characteristic Deformation and failure mode Geometry effect