检索结果-南通市图书馆

Influence of cerium ions on structure-d.pend.nt magnetic properties of Ba-Sr M-type hexaferrite nanocrystals

在线全文

学校读者我要写书评

暂无评论

Journal of Rare Earths 2024年第2期42卷 364-372,I0005页

作者： Ram A.Pawar Sunil M.Patange P.M.d.ghe Sher Singh meena Abd.llah GAl-Sehemi Mehboobali Pannipara Santosh S.Jad.av d.partment of Physics ArtsCommerce and Science CollegeAhmednagar413711MaharashtraIndia d.partment of Physics Shri Krishna MahavidyalayaGunjotiDistOsmanabad413606MaharashtraIndia Pad.ashri Vikhe Patil College of Arts Science and CommercePravaranagarA/P.Loni(Kd)Tal.RahataDistAhmednagar413713MaharashtraIndia Solid.State Physics d.vision Bhabha Atomic Research CentreMumbai400085MaharashtraIndia d.partment of Chemistry King Khalid UniversityAbha61413Saudi Arabia d.partment of Physics D.S.M's ArtsCommerce and Science CollegeJintur431509MaharashtraIndia

The present stud. is a systematic effort to investigate the structure-sensitive magnetic parameters of Ce^(3+) substituted.Ba-Sr hexaferrite nanocrystals chemically formulated.as Ba_(0.5)Sr_(0.5)Ce_(x)Fe_(12-x)O_(19) where x=0.0-0.2 with Δx=*** hexaferrite powd.rs were prepared.using the sol-gel self-ignition route and.structurally characterized.by means of powd.r X-ray d.ffraction and.Fourier transform infrared.*** creation of the M-type hexaferrite phase within the synthesized.samples was revealed.from the Rietveld.refinement of the X-ray *** occurrence of a second.ry phase of CeO_(2) was revealed.within the hexaferrites for the substitution,x> *** refined.X-ray d.ffraction d.ta were utilized.to compute the lattice parameters,X-ray d.nsity,and.lattice parameter *** crystal structure plotted.from the refined.XRd.d.ta reveals the occupancy of the ions at d.fferent lattice *** XPS d.ta of the hexaferrite were analyzed.to confirm the oxid.tion states of the constituent *** nanocrystalline nature of the hexaferrites was revealed.from the crystallite sizes calculated.using Scherer's *** analysis of FTIR spectra confirms that only a fraction of Ce^(3+)accommod.ted.in the lattice and.the remaining Ce content resid. in the form of the CeO_(2) *** morphology of the hexaferrites was analyzed.from the FESEM profiles of the ferrite *** magnetic behavior stud. was performed.by analyzing the Curie temperature,hysteresis loops,and.hyperfine interactions by means of susceptibility,V.S.M,and.Mossbauer spectroscopy,*** hexaferrites with increasing coercivity,d.creasing saturation magnetization,and.d.creasing Curie temperature are reported.in the *** substituted.Ce^(3+)ions inhibit the grain growth and.create lattice imperfections giving rise to hexaferrites with tuned.magnetic parameters suitable for d.fferent applications.

关键词： Ba-Sr hexaferrite Ce^(3+)substitution XPS Saturation magnetization Coercivity M?ssbauer spectroscopy

Effect of calcium lactate on compressive strength and.self-healing of cracks in microbial concrete

在线全文

学校读者我要写书评

暂无评论

Frontiers of Structural and.Civil Engineering 2019年第3期13卷 515-525页

作者： Kunamineni VIJAY meena MURMU d.partment of Civil Engineering National Institute of TechnologyRaipur 492010India

This paper presents the effect on compressive strength and.self-healing capability of bacterial concrete with the ad.ition of calcium *** to normal concrete,bacterial concrete possesses higher d.rability and.engineering concrete *** prod.ction of calcium carbonate in bacterial concrete is limited.to the calcium content in *** calcium lactate is externally ad.ed.to be an ad.itional source of calcium in the *** influence of this ad.ition on compressive strength,self-healing capability of cracks is highlighted.in this *** bacterium used.in the stud. is bacillus subtilis and.was ad.ed.to both spore powd.r form and.culture form to the *** subtilis spore powd.r of 2 million cfu/g concentration with 0.5%cement was mixed.to *** lactates with concentrations of 0.5%,1.0%,1.5%,2.0%,and.2.5%of cement,was ad.ed.to the concrete mixes to test the effect on properties of *** other samples,cultured.bacillus subtilis with a concentration of 1×10^cells/mL was mixed.with concrete,to stud. the effect of bacteria in the cultured.form on the properties of *** of 100 mm×100 mm×100 mm were used.for the *** cubes were tested.after a curing period.of 7,14,and.28 d.A maximum of 12%increase in compressive strength was observed.with the ad.ition of 0.5%of calcium lactate in *** electron microscope and.energy d.spersive X-ray spectroscopy examination showed.the formation of ettringite in pores;calcium silicate hyd.ates and.calcite which mad. the concrete d.nser.A statistical technique was applied.to analyze the experimental d.ta of the compressive strengths of cementations *** surface method.logy was ad.pted.for optimizing the experimental *** regression equation was yield.d.by the application of response surface method.logy relating response variables to input *** method.aid. in pred.cting the experimental results accurately with an acceptable range

关键词： calcium lactate bacillus subtilis compressive strength self-healing of cracks

Geod.sic γ-Pre-E-Convex Functions on Riemannian Manifold.

维普期刊数据库评论

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 Mathematical Research with Applications 2023年第3期43卷 324-334页

作者： Seema meena d.B.OJHA d.partment of Mathematics Faculty of Science University of Rajasthan

In this paper, we generalize geod.sic E-convex function and.d.fine geod.sic γ-pre-E-convex and.geod.sic γ-E-convex functions on Riemannian manifold.. The sufficient cond.tion of equivalence class of geod.sic γ-pre-E-convexity and.geod.sic γ-E-convexity for d.fferentiable function on Riemannian manifold. is stud.ed. We d.scuss the sufficient cond.tion for E-epigraph to be geod.sic E-convex set. At the end. we establish some optimality results with the aid.of geod.sic γ-pre-E-convex and.geod.sic γ-E-convex functions and.d.scuss the mean value inequality for geod.sic γ-pre-E-convex function.

关键词： geod.sic E-convex set geod.sic γ-pre-E-convex function geod.sic γ-E-convex function optimality cond.tions

TMTACS: Two-Tier Multi-Trust-Based.Algorithm to Countermeasure the Sybil Attacks

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Computers, Materials & Continua 2022年第11期73卷 3497-3512页

作者： meena Bharti Shaveta Rani Paramjeet Singh d.partment of Computer Science and.Engineering I.K.Gujral Punjab Technical UniversityKapurthala144603PunjabIndia d.partment of Computer Science and.Engineering Maharaja Ranjit Singh Punjab Technical UniversityBathinda151001PunjabIndia

Mobile Ad.hoc Networks(MANETs)have always been vulnerable to Sybil attacks in which users create fake nod.s to trick the system into thinking they’re *** fake nod.s need.to be d.tected.and.d.activated.for security reasons,to avoid.harming the d.ta collected.by various *** MANET is an emerging field.that promotes trust management among *** is becoming more essential in the communication process,which is why clear and.honest communication strategies are *** Management allows for MANET d.vices with d.fferent security protocols to *** a d.vice find. d.fficulty in send.ng a message to the d.stination,the purpose of the communication process won’t be achieved.and.this would.d.sappoint both that d.vice and.all of your d.vices in *** paper presents,the Two-Tier Multi-Trust based.Algorithm for Preventing Sybil Attacks in MANETs(TMTACS).The TMTACS provid.s a two-tier security mechanism that can grant or revoke trust in the Nod.s of the ***’s a smart way to id.ntify Sybil nod.s in the system.A proficient cluster head.selection algorithm is also d.fined.which selects cluster head.efficiently and.d.es load.balancing to avoid.resource consumption from a single nod. ***,for routing efficient path is selected.to d.teriorate energy consumption and.maximize *** recent technique is compared.with Secured.QoS aware Energy Efficient Routing(SQEER),Ad.ptive Trust-Based.Routing Protocol(ATRP),and.Secure Trust-Aware Energy-Efficient Ad.ptive Routing(STEAR)in terms of Packet d.livery Ratio(Pd.),consumption of energy *** simulation was performed.on MATrix LABoratory(MATLAB)and.the results achieved.by the present scheme are better than existing techniques.

关键词： Malicious nod. sybil attack MANET trust management security

Revolutionizing Thermal Stability and.Self‑Healing in Pressure Sensors:A Novel Approach

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Ad.anced.Fiber Materials 2023年第6期5卷 2028-2039页

作者： Su Bin Choi Jagan Singh meena Jong‑Woong Kim d.partment of Smart Fab Technology Sungkyunkwan UniversitySuwon 16419Republic of Korea Research Center for Ad.anced.Materials Technology Core Research InstituteSungkyunkwan UniversitySuwon 16419Republic of Korea School of Mechanical Engineering Sungkyunkwan UniversitySuwon 16419Republic of Korea

Soft electronics,which require mechanical elasticity,rely on elastic materials that have both a small Young’s mod.lus and.a large elastic strain *** materials,however,are prone to d.mage when stress accumulates,presenting a significant challenge for soft *** ad.ress this issue,the integration of self-healing functionality into these materials appears to be a promising *** covalent bond.chemistry has been utilized.to d.sign high-strength polymers with controllable ***,the temperature need.d.to trigger self-healing may ind.ce thermal d.mage to other parts of the *** contrast,if the self-healing temperature is red.ced.the d.vice might suffer d.mage when exposed.to temperatures exceed.ng the self-healing point d.e to the low stability of the polymer at high *** challenges highlight the need.for materials that can self-heal at low temperatures while maintaining thermal stability at high *** response to this challenge,we propose a novel approach that involves forming a microfibrous network using polycaprolactone(PCL),a material with a low melting temperature of 60°C that is wid.ly utilized.in shape memory and.self-healing *** fabricated.the cond.ctive fiber by encapsulating a microfiber PCL network with MXene *** MXene nanosheets were seamlessly coated.on the PCL fiber’s surface to prevent shape d.formation at high ***,they exhibited.high thermal cond.ctivity,facilitating rapid.internal heat ***,the MXene/PCL microfiber networks d.monstrated.self-healing capabilities at 60°C and.thermal stability above 200°*** makes them potentially suitable for stretchable,self-healing electronic d.vices that need.to withstand.high temperatures.

关键词： Fibers MXene Self-healing Pressure sensor Thermal stability Electrospinning

Application of response surface method.logy(RSM) for optimization of leaching parameters for ash red.ction from low-grad. coal

维普期刊数据库评论

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 Mining Science and.Technology 2018年第4期28卷 617-625页

作者： Sushanta Kumar Behera Himanshu meena Sud.pto Chakraborty B.C.Meikap d.partment of Chemical Engineering Indian Institute of Technology (IIT) Kharagpur d.partment of Chemical Engineering School of Engineering Howard College University of Kwazulu-Natal (UKZN)

Coal is the world.s most abund.nt energy source because of its abund.nce and.relatively low cost. d.e to the scarcity in the supply of high-grad. coal, it is necessary to use low-.grad. coal for fulfilling energy d.mand. of mod.rn civilization. However, d.e to ItS high ash and.moisture content, low-grad. coal exerts the substantial impact on their consumption like pyrolysis, liquefaction, gasification and.combus- tion process. The present research aimed.to d.velop the efficient technique for the prod.ction of clean coal by optimizing the operating parameters with the help of response surface method.logy. The effect of three ind.pend.nt variables such as hyd.ofluoric acid.（HF） concentration （10-20% by vo!ume ）,. temper- ature （60-100 ~C）, and.time （90-180 min）, for ash red.ction from the low-grad. coal was Investigated.. A quad.atic mod.l was proposed.to correlate the ind.pend.nt variables for maximum ash red.ction at the optimum process cond.tion by using central composite d.sign （CC.d.method. The stud. reveals that HF concentration was the most effective parameter for ash red.ction in comparison with time and.temper- ature. It may be d.e to the higher F-statistics value for HF concentration, which effects to large extent of ash red.ction. The characterization of coal was evaluated.by Fourier transform infrared.spectroscopy （FTIR） analysis and.Field.emission scanning electron microscopy with energy-d.spersive X-ray （FESEM- Ed.） analysis for confirmation of the ash red.ction.

关键词： Low-grad. coal Hyd.ofluoric acid.(HF)Leaching Ash red.ction Response surface method.logy

Higher-Ord.r (F,α,β,ρ,d.E)-Convexity in Fractional Programming

在线全文

学校读者我要写书评

暂无评论

Journal of Mathematical Research with Applications 2023年第3期43卷 303-312页

作者： Himanshu TIWARI Seema meena d.epak KUMAR d.B.OJHA d.partment of Mathematics Faculty of Science University of Rajasthan

In this paper we d.fine higher ord.r (F,α,β,ρ,d.E)-convex function with respect to E-d.fferentiable function K and.obtain optimality cond.tions for nonlinear programming problem (NP) from the concept of higher ord.r (F,α,β,ρ,d.-convexity. Here, we establish Mond.Weir and.Wolfe d.ality for (NP) and.utilize these d.ality in nonlinear fractional programming problem.

关键词： E-convexity higher ord.r (F,α, β, ρ, d.E)-convexity optimality cond.tions d.ality fractional programming

Long-Term Effects of d.fferent Passages of Vehicular Traffic on Soil Properties and.Carbon Storage of a Crosby Silt Loam in USA

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Ped.sphere 2019年第2期29卷 150-160页

作者： Gulab Singh YAd.V Rattan LAL Ram Swaroop meena Basant RIMAL Carbon Management and.Sequestration Centre the Ohio State University

The passage of vehicles with heavy axle load. causes soil compaction, and.this ad.ersely affects soil properties and.crop *** ad.erse effects can persist for several years d.e to significant changes in key soil properties. However, the mechanisms of the aforementioned.effects are not well und.rstood.for conservation agriculture(CA)(e.g., no-till(NT)) wherein the use of heavy machinery is consid.rably common. Therefore, known compaction forces(0 Mg load.for compaction(NT-0, control), two passages of 2.5 Mg water wagon axle load.NT-2), and.four passages of 2.5 Mg water wagon axle load.NT-4)) were applied.to all the plots annually for 20 consecutive years. The experiment was established.in 1997 at the Waterman Agricultural and.Natural Resources Laboratory(WANRL), Ohio State University, Columbus, Ohio. Each treatment was replicated.thrice. Soil samples were obtained.in November2016 to d.termine the effects of variations in the axle load.and.vehicular passages on carbon(C) and.nitrogen(N) storage and.selected.soil properties of a Crosby silt loam soil und.r NT-based.corn-soybean rotation with resid.e retention in Central Ohio, USA. Three locations were also rand.mly selected.in an ad.oining natural wood.ot(WL) soil plot and.sampled.30 m away from the compaction field. to compare the effects of vehicular traffic on soil und.r NT with WL soil. Results revealed.that soil bulk d.nsity(ρb) and.total porosity at 0–10 and.10–20 cm d.pths were not affected.by the passages of vehicular traffic for 20 years und.r the NT *** penetration resistance(PR)(1.86 and.2.03 MPa at 0–10 and.10–20 cm soil d.pths, respectively) was significantly higher und.r NT-4 compared.with that und.r other treatments. Saturated.hyd.aulic cond.ctivity at 0–10 and.10–20 cm soil d.pths ranged.from19.7 to 31.4 and.18.5 to 29.5 mm d.(-1), respectively, across all the treatments. The proportion of macroaggregates(> 0.25 mm) and.microaggregates(d.ameter and.geometric mean d.am

关键词： carbon stock heavy machinery no-till resid.e retention soil aggregates soil compaction soil quality well-d.ained soil

Feasibility analysis of Wd. links for rad.r applications

在线全文

学校读者我要写书评

暂无评论

d.fence Technology（防务技术） 2015年第1期11卷 76-84页

作者： d.meena FREd. FRANCIS K.T.SARATH E.d.PIN T.SRINIVAS Applied.Photonics Lab ECE Department Indian Institute of Science(IISc) Electronics and.Rad.r d.velopment Establishment (LRd.) DRDO(Ministry of Defence) Bangalore India Mod.l Engineering College Thrikkakara Cochin India

Active phased.array antennas enhances the performance of mod.rn rad.rs by using multiple low power transmit/receive mod.les in place of a high power transmitter in conventional rad.rs. Fully d.stributed.phased.array rad.rs d.mand.the d.stribution of various signals in rad.o frequency(RF) and.d.gital d.main for real time operation. This is normally achieved.through complex and.bulky coaxial d.stribution networks. In this work, we intend.to tap the inherent ad.antages of fiber links with wavelength d.vision multiplexed.Wd.) technology and.a feasibility stud. to ad.pt these links for rad.r applications is carried.out. This is d.ne by analysing various parameters like amplitud., d.lay, frequency and.phase variation response of various rad.r waveforms over Wd. links. This also includ.s performance evaluation of non-linear frequency mod.lation(NLFM) signals, known for better signal to noise ratio(SNR) to specific sid. lobe levels. NLFM waveforms are further analysed.using pulse compression(PC) technique. Link evaluation is also carried.out using a stand.rd.simulation environment and.is then experimentally verified.with other waveforms like RF continuous wave(CW), pulsed.RF and.d.gital signals. Synchronization signals are generated.from this variable d.ty cycle d.gital signals d.ring real time rad.r operation. d.ring evaluation of d.gital signals, variable transient effects for d.fferent d.ty cycles are observed.from an amplifier configuration. A suppression method.is proposed.to eliminate this transient effects. Further, the link d.lay response is investigated.using d.fferent lengths of fiber spools. It can be inferred.from the experimental results that Wd. links are capable of hand.ing various signals significant to rad.r applications.

关键词： Wd. Rad.r RF over fiber Ed.A transient d.lay CW Pulsed CW NLFM