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排序方式: 共有156条查询结果,搜索用时 15 毫秒
41.
Awasthi Shashank Chowdhury Barnali Haider Zuhaib Ali Jalil Yupapin Preecha Metya Sanjeev Kumar Majumder Alak 《Journal of Computational Electronics》2022,21(1):304-318
Journal of Computational Electronics - The extensive search for the implementation of reversible logic using emerging technologies has paved the way for the rise of optical computing. The... 相似文献
42.
43.
Kamlendra Awasthi V. Kulshrestha Rashi Nathawat N.K. Acharya M. Singh D.K. Avasthi Y.K. Vijay 《Polymer Bulletin》2006,57(5):723-728
Summary The preparation of conical pores in polyethylene terepthlate (PET) membrane is described. The conical pores prepared in PET
by track etching technique. For this purpose, Cl9+ ion irradiated film was placed into an electrolytic cell and etched from one side while other side of membrane was protected
by a stopping medium. During etching, current was recorded as a function of time, which shows a sudden change, indicating
the pores breakthrough. After breakthrough, the etch process is interrupted by replacing the etching solution. After etching,
the current voltage characteristics were determined under symmetric bath conditions. The resulting conical pores show non
ohmic behavior, similar to that of an electronic diode. 相似文献
44.
Awasthi Reena Abraham Geogy Kumar Santosh Bhattacharyya Kaustava Keskar Nachiket Kushwaha R. P. Rao Ramana Tewari R. Srivastava D. Dey G. K. 《Metallurgical and Materials Transactions A》2017,48(6):2915-2926
Metallurgical and Materials Transactions A - In this study, corrosion characteristics of a nickel-based Ni-Mo-Cr-Si hardfacing alloy having 32Mo, 15Cr, and 3Si (wt pct) as alloying... 相似文献
45.
Viscous Potential Flow Analysis of Nonlinear Rayleigh–Taylor Instability with Heat and Mass Transfer
Mukesh Kumar Awasthi Rishi Asthana G. S. Agrawal 《Microgravity science and technology》2012,24(5):351-363
The nonlinear analysis of Rayleigh?CTaylor instability of two viscous fluids is studied when there is heat and mass transfer across the interface, using viscous potential flow theory. The fluids are considered to be viscous and incompressible with different kinematic viscosities. The analysis is based on the method of multiple scale perturbation and the nonlinear stability is governed by first-order nonlinear partial differential equation. The stability conditions are obtained and stability is discussed theoretically as well as numerically. Regions of stability and instability have been shown graphically indicating the effect of various parameters. It has been observed that the heat and mass transfer has stabilizing effect on the stability of the system in the nonlinear analysis. 相似文献
46.
Sanjeev K. Srivastava S. K. Awasthi 《Journal of Superconductivity and Novel Magnetism》2012,25(4):883-892
The present paper describes the theoretical investigation of enlarged reflection bands (photonic band gaps) in a 1D star waveguide (SWG) structure consists of superconductor and dielectric as its constituent materials. For the present study, we take the different combinations of superconductor and dielectric materials as a backbone and side branches of the SWG structure. In order to obtain the dispersion relation, Interface Response Theory (IRT) has been employed. Photonic band gaps of SWG structure having superconductor?Csuperconductor, superconductor?Cdielectric, and dielectric?Csuperconductor materials are compared with the band gaps of the conventional photonic crystal (PC) structure having superconductor?Csuperconductor and dielectric?Csuperconductor materials. Analysis of the dispersion characteristics shows that there exists no band gaps for conventional PC when both layers are made of the same superconducting materials (as the usual case) while the SWG structure shows forbidden bands of finite width even the backbone and side branches are made of same materials. Also, the SWG structure having superconductor?Cdielectric shows the wider reflection bands in comparison with the structure having dielectric?Csuperconductor as its constituent materials, while for the conventional PC structure it is same in both the cases. Further, the effect of temperature and the effect of variation of number of grafted branches on the photonic bands of SWG structure have been studied. 相似文献
47.
Magnetic-nanoparticle-doped carbogenic nanocomposite: an effective magnetic resonance/fluorescence multimodal imaging probe 总被引:1,自引:0,他引:1
Srivastava S Awasthi R Tripathi D Rai MK Agarwal V Agrawal V Gajbhiye NS Gupta RK 《Small (Weinheim an der Bergstrasse, Germany)》2012,8(7):1099-1109
A novel and facile approach is developed to synthesize a magnetic nanoparticle (iron oxide)-doped carbogenic nanocomposite (IO-CNC) for magnetic resonance (MR)/fluorescence imaging applications. IO-CNC is synthesized by thermal decomposition of organic precursors in the presence of Fe(3) O(4) nanoparticles with an average size of 6 nm. IO-CNC shows wavelength-tunable fluorescence properties with high quantum yield. Magnetic studies confirm the superparamagnetic nature of IO-CNC at room temperature. IO-CNC shows MR contrast behavior by affecting the proton relaxation phenomena. The measured longitudinal (r(1) ) and transverse (r(2) ) relaxivity values are 4.52 and 34.75 mM(-1) s(-1) , respectively. No apparent cytotoxicity is observed and the nanocomposite shows a biocompatible nature. In vivo MR studies show both T(1) and T(2) * contrast behavior of the nanocomposite. Fluorescence imaging indicates selective uptake of IO-CNC by macrophages in spleen. 相似文献
48.
Carsharing organizations are nowadays faced with the emergence of new markets due to the growing popularity of their services. To keep up with the growing demand, they have to constantly adapt their network and balance their stations’ capacities by implementing new strategies. These strategies involve creation of new carsharing stations, increasing the capacity of stations, merging or demerging carsharing stations etc. Currently, the decision makers rely on an intuitive strategy selection process which often results in inadequate decisions being made representing an immediate loss in resources, time and market penetration. This paper presents a discrete event simulation based decision support tool that assists the decision makers in selecting best network growth strategies to implement for meeting adequately the demand growth while maximizing the members’ satisfaction level and minimizing the number of vehicles used. Our discrete event simulation model allows modeling the activities at any given set of carsharing stations, regardless of their number and capacities. A benchmarking comparison of different potential strategies is done. An application of the proposed model on a region of Communauto’s Montréal (Québec, Canada) carsharing network is provided. 相似文献
49.
M. Awasthi D. Nellans K. Sudan R. Balasubramonian A. Davis 《International journal of parallel programming》2012,40(1):57-83
Modern processors such as Tilera’s Tile64, Intel’s Nehalem, and AMD’s Opteron are migrating memory controllers (MCs) on-chip,
while maintaining a large, flat memory address space. This trend to utilize multiple MCs will likely continue and a core or
socket will consequently need to route memory requests to the appropriate MC via an inter- or intra-socket interconnect fabric
similar to AMD’s HyperTransportTM, or Intel’s Quick-Path InterconnectTM. Such systems are therefore subject to non-uniform memory access (NUMA) latencies because of the time spent traveling to
remote MCs. Each MC will act as the gateway to a particular region of the physical memory. Data placement will therefore become
increasingly critical in minimizing memory access latencies. Increased competition for memory resources will also increase
the memory access latency variation in future systems. Proper allocation of workload data to the appropriate MC will be important
in decreasing the variation and average latency when servicing memory requests. The allocation strategy will need to be aware
of queuing delays, on-chip latencies, and row-buffer hit-rates for each MC. In this paper, we propose dynamic mechanisms that
take these factors into account when placing data in appropriate slices of physical memory. We introduce adaptive first-touch
page placement, and dynamic page-migration mechanisms to reduce DRAM access delays for multi-MC systems. We also introduce
policies that can handle data placement in memory systems that have regions with heterogeneous properties. The proposed policies
yield average performance improvements of 6.5% for adaptive first-touch page-placement, and 8.9% for a dynamic page-migration
policy for a system with homogeneous DRAM DIMMs. We also show improvements in systems that contain DIMMs with different performance
characteristics. 相似文献
50.
Pooja Sahlot Gaurav Sharma Vasant Sathe Anil K. Sinha Anand M. Awasthi 《Journal of the American Ceramic Society》2020,103(5):3238-3248
From low-temperature Synchrotron X-ray diffraction, a precise thermal characterization of octahedral distortions in single-phase Ruddlesden-Popper Ca3Mn2O7 is performed. Highly sensitive close-steps temperature dependences of Mn-O-Mn bond angles connecting MnO6 octahedra clearly reveal the signature of spin ordering in the system. Spin-lattice coupling is thus revealed via the structural distortions, responsible for the evolution of the magnetic state. Further, benchmark temperature anomalies observed in the unit cell volume and its polarization-measure highlight the interplay between spin, lattice, and charge degrees of freedom. Strong spin-lattice coupling is supported by the Raman spectroscopy results across the magnetic ordering. Dielectric study on Ca3Mn2O7 features relaxor-like segmented dynamics below the antiferromagnetic ordering. Dipolar relaxations of different origins are spectrally resolved, exhibiting distinct H-field alterations which identify their allegiance to different magnetic subphases. Dipole-relaxation characteristics examined under applied magnetic field and the ensuing magneto-dielectricity consistently correlate with the concurrent magnetic, structural, and vibrational features. 相似文献