检索结果-南通市图书馆

RBFK cipher:a randomized butterfly architecture‑based lightweight block cipher for IoT devices in the edge computing environment

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Cybersecurity 2023年第3期6卷 18-36页

作者： Sohel rana m.Rubaiyat Hossain mondal Joarder Kamruzzaman Institute of Information and Communication Technology Bangladesh University of Engineering and TechnologyDhakaBangladesh Centre for Smart Analytics Federation University AustraliaGippslandVIC 3842Australia

Internet security has become a major concern with the growing use of the Internet of Things(IoT)and edge computing *** though data processing is handled by the edge server,sensitive data is generated and stored by the IoT devices,which are subject to *** most IoT devices have limited resources,standard security algorithms such as AES,DES,and RSA hamper their ability to run *** this paper,a lightweight symmetric key cipher termed randomized butterfly architecture of fast Fourier transform for key(RBFK)cipher is proposed for resource-constrained IoT devices in the edge computing *** butterfly architecture is used in the key scheduling system to produce strong round keys for five rounds of the encryption *** RBFK cipher has two key sizes:64 and 128 bits,with a block size of 64 *** RBFK ciphers have a larger avalanche effect due to the butterfly architecture ensuring strong *** proposed cipher satisfies the Shannon characteristics of confusion and *** memory usage and execution cycle of the RBFK cipher are assessed using the fair evaluation of the lightweight cryptographic systems(FELICS)*** proposed ciphers were also implemented using mATLAB 2021a to test key sensitivity by analyzing the histogram,correlation graph,and entropy of encrypted and decrypted *** the RBFK ciphers with minimal computational complexity provide better security than recently proposed competing ciphers,these are suitable for IoT devices in an edge computing environment.

关键词： Avalanche effects Block ciphers Butterfly architecture Edge computing FELICS IoT Lightweight cryptosystems mATLAB

Radiation-Induced Nano-Explosions at the Solid Surface: Near Surface Radiation Damage in CR-39 Polymer

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Chinese Physics Letters 2011年第8期28卷 83-86页

作者： mukhtar Ahmed rana Physics Division Pakistan Institute of Nuclear Science and Technology(PINSTECH)P.O.NiloreIslamabadPakistan

New measurements of fission fragment and alpha particle induced surface damage in the most sensitive and commonly used nuclear track detector CR-39 are presented *** designed and optimized exposure and chemical etching experiments are employed to unfold the structure of radiation induced surface damage(RISD).Delay in the startup of the chemical etching of latent tracks or surface radiation damage is measured and is found to contain important information about the structure of the surface *** atomic scale pictures of RISD and its chemical etching are developed in an empirical *** model and experimental findings coherently compose a realistic picture of early or femtosecond evolution of RISD.

关键词： coherent finding damage

Formation of Charged Particle Tracks in Solids

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Chinese Physics Letters 2006年第6期23卷 1448-1451页

作者： mukhtar A. rana Physics Research Division PINSTECH PO Nilore Islamabad Pakistan

A criterion for formation of etchable tracks in solids is suggested using the well-known concepts of ionization and thermal spikes, diffusion process with useful and justified assumptions, and present or published experimental and theoretical investigations on the same subject. The suggested criterion is useful for a wide spectrum of researchers including development and applications of track recording materials, ions implantation, sputtering and other areas, which include interactions of charged particles with solids.

关键词： RADIATION-DAmAGE ACTIVATION-ENERGY AuGER ELECTRONS CR-39 DETECTORS

Search for microglia-specific peptides:advances in the discovery toolbox

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Neural Regeneration Research 2025年第2期20卷 471-472页

作者： Ivan Sarabia Kyle m.Koss Department of Surgery University of ArizonaTucsonAZUSA

uncontrolled and chronic inflammatory states in the central nervous system(CNS)are the hallmark of neurodegenerative pathology and every injury or stroke-related *** key mediators of these neuroinflammatory states are glial cells known as microglia,the resident immune cell at the core of the inflammatory event,and astroglia,which encapsulate inflammatory insults in proteoglycan-rich scar *** gliotic scar blocks significant portions of healthy axonal networking,preventing *** most neuroinflammation is exclusively based on the responses of said microglia,their phenotypes are suggested to follow those of macrophages;m1 and m2 are opposites of pro-and ***,microglial phenotypes have been identified to be on an inflammatory spectrum encompassing developmental,homeostatic,and reparative behaviors as opposed to their ability to affect devastating cell death cascades and scar tissue formation.

关键词： inflammation pathology death

Seismic demand of plan-asymmetric structures:a revisit

在线全文

学校读者我要写书评

暂无评论

Earthquake Engineering and Engineering Vibration 2013年第1期12卷 99-117页

作者： rana Roy Suvonkar Chakroborty Department of Aerospace Engineering & Applied mechanics Bengal Engineering and Science UniversityShibpurIndia SmS India Pvt.Ltd. SMS GroupIndia

In view of the recognition of the importance of the interdependent behavior of strength and stiffness of walltype structural elements,the seismic demand of plan-asymmetric systems is *** strength distribution strategies,i.e.,＇Center of Strength-Center of mass（CV-Cm） coinciding＇ and ＇Balanced Center of Strength-Center of Resistance（CVCR）＇ are *** charts for the seismic demand of classical uni-directionally and bi-directionally asymmetric systems are developed in a simple unified format.A conceptual framework is also outlined to conveniently apply the design *** are included to explain the use of the current recommendations in practical *** study also highlights the relative performance of ＇CV-Cm coinciding＇ and ＇Balanced CV-CR＇ criteria.

关键词： asymmetry seismic strength dependent stiffness design chart

Two-component modeling for non-Newtonian nanofluid slip flow and heat transfer over sheet: Lie group approach

在线全文

学校读者我要写书评

暂无评论

Applied mathematics and mechanics(English Edition) 2016年第10期37卷 1325-1340页

作者： P.rana m.J.uDDIN Y.GuPTA A.I.m.ISmAIL Department of mathematics Jaypee Institute of Information Technology School of mathematical Sciences Universiti Sains Malaysia Department of mathematics American International University-Bangladesh

The present paper deals with the multiple solutions and their stability analy- sis of non-Newtonian micropolar nanofluid slip flow past a shrinking sheet in the presence of a passively controlled nanoparticle boundary condition. The Lie group transformation is used to find the similarity transformations which transform the governing transport equations to a system of coupled ordinary differential equations with boundary condi- tions. These coupled set of ordinary differential equation is then solved using the Runge- Kutta-Fehlberg fourth-fifth order （RKF45） method and the ode15s solver in mATLAB. For stability analysis, the eigenvalue problem is solved to check the physically realizable solution. The upper branch is found to be stable, whereas the lower branch is unsta- ble. The critical values （turning points） for suction （0 〈 sc 〈 s） and the shrinking parameter （Xc 〈 X 〈 0） are also shown graphically for both no-slip and multiple-slip conditions. multiple regression analysis for the stable solution is carried out to inves- tigate the impact of various pertinent parameters on heat transfer rates, The Nusselt number is found to be a decreasing function of the thermophoresis and Brownian motion parameters.

关键词： micropolar nanofluid stability multiple-slip Lie group mATLAB

Corrosion by a Heavy metal Oxide Glass

在线全文

学校读者我要写书评

暂无评论

Journal of materials Science & Technology 2005年第2期21卷 243-245页

作者： B.B.rana Department of Engineering materials university of Sheffield Sheffield S1 4DU UK PCSIR Laboratories Complex LahorePakistan

melts of lead bismuth gallate compositions are highly corrosive and attack on crucibles of different materials. In the present study, corrosion by a base glass (50PbO-30Bi2O3-20Ga2O3 in mole fraction) melted using different crucibles and the effect on uV-VIS and IR edges were studied. By melting the base glass in platinum/2% rhodium, gold zirconia and alumina crucibles showed less effect on the IR edge and therefore shifted the infrared edge to longer wavelength, whereas silica crucible contaminated the glass, causing a severe deterioration in the infrared and hence shifted infrared edge to much shorter wavelength. In the uV-VIS region, base glass melted in platinum/2% rhodium crucible shifted the edge to the longest wavelength whereas silica crucible shifted the edge to shorter wavelength. The contaminants from gold, zirconia and alumina crucibles caused the uV-VIS edge of the base glass to lie between the two extremes of Pt/2% Rh and SiO2 crucibles. The glasses melted in above mentioned crucibles were also characterized with inductively coupled plasma spectroscopy (ICP) analysis to measure the level of contamination from the crucibles. Depending upon crucible used, the colors of glasses obtained ranged from red to yellow.

关键词： Oxide glass Corrosion Crucible

Nonlinear forced vibration in a subcritical regime of a porous functionally graded pipe conveying fluid with a retaining clip

在线全文

学校读者我要写书评

暂无评论

Applied mathematics and mechanics(English Edition) 2025年第1期46卷 101-122页

作者： m.GHOLAmI m.EFTEKHARI Department of mechanical Engineering Shahid Bahonar University of Kerman

This study examines the nonlinear behaviors of a clamped-clamped porous pipe made of a functionally graded material(FGm) that conveys fluids and is equipped with a retaining clip, focusing on primary resonance and subcritical dynamics. The nonlinear governing equations for the FGm pipe are derived by the extended Hamilton's principle, and subsequently discretized through the application of the Galerkin *** direct method of multi-scales is then used to solve the derived equations. A thorough analysis of various parameters, including the clip stiffness, the power-law index, the porosity, and the clip location, is conducted to gain a comprehensive understanding of the system's nonlinear dynamics. Through the analysis of the first natural frequency, the study highlights the influence of the flow velocity and the clip stiffness, while the comparisons with metallic pipes emphasize the role of FGm composition. The examination of the forced response curves reveals saddle-node bifurcations and their dependence on parameters such as the detuning parameter and the power-law index, offering valuable insights into the system's nonlinear resonant behavior. Furthermore, the frequency-response curves illustrate the hardening nonlinearities influenced by factors such as the porosity and the clip stiffness, revealing nuanced effects on the system response and resonance characteristics. This comprehensive analysis enhances the understanding of nonlinear behaviors in FGm porous pipes with a retaining clip, providing key insights for practical engineering applications in system design and optimization.

关键词： Galerkin methods

Synthesis of PbS-K2La2Ti3O10 composite and its photocatalytic activity for hydrogen production

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Progress in Natural Science:materials International 2012年第2期22卷 120-125页

作者： Dipak rana Department of Chemical and Biological Engineering University of OttawaOttawaCanada K1N 6N5

Photocatalyst,lead sulfide(PbS)-intercalated layer perovskite-type compound(K2La2Ti3O10),was synthesized via ion-exchange reaction,butylamine pillaring and sulfuration processes under the assistance of the microwave *** structure of the photocatalysts was determined by means of powder X-ray diffraction,scanning electron microscope,ultraviolet-visible diffuse reflection spectra and photoluminescence *** the photocatalytic activity of the composite compound for hydrogen production was also *** experimental results showed that the intercalation of PbS in the layered space of K2La2Ti3O10 greatly improved the absorption edge and the photocatalytic *** production of the PbS-K2La2Ti3O10 was 127.19 mmol/(g cat)after 3 h irradiation of ultraviolet light.

关键词： K2La2Ti3O10 microwave irradiation PbS Intercalation Hydrogen production Catalytic performance