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A multichannel neural signal detecting module:Its design and test in animal experiments

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progress in Natural Science:Materials International 2007年第6期17卷 675-680页

作者： k.p.koch Fraunhofer Institute for Biomedical Engineering 66386 St.Ingbert Germany

A four-channel neural signal detecting module with an implantable 12-contact cuff electrode was designed for real-time neural signal recording on peripheral and central nerves. The mathematic coupling model between nerve and electronic system was analyzed. Electrode connection configurations were considered. The detecting circuit included an input coupling network, a pre-amplifier, and some filtering and notching stages. Shield guarding and the right-leg-driven circuit were developed for further elimination of common mode interference. By electrode switches, the module could cooperate with a nerve functional electrical stimulation circuit, building a neural channel bridge-connection system. It was tested by recording experiments on rat’s sciatic and spine nerves. The signals in spontaneous and evoked conditions have been captured successfully. In addition, an implantable neural signal detecting CMOS IC has been introduced.

关键词： Cuff electrode quasi-tripolar configuration neural signal recording neural channel bridge-connection.

Comparative study of mechanical, corrosion and erosion-corrosion properties of cast hyper-duplex and super-duplex stainless steels

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International Journal of Minerals,Metallurgy and Materials 2020年第7期27卷 954-961页

作者： p.Nithin Raj p.k.Navaneethkrishnan k.Sekar M.A.Joseph Department of Mechanical Engineering National Institute of TechnologyCalicutIndia

Duplex stainless steels(DSSs)used in subsea structures and desalination industries require high corrosion and erosion resistance as well as excellent mechanical *** newly introduced cast duplex grade ASTM A8907 A has a unique composition and is expected to have a much better resistance to corrosion and erosion compared with the super-duplex grades 5 A and 6 *** work is a comparative study of the mechanical properties,corrosion,and erosion-corrosion resistance of super-duplex grades 5 A and 6 A and the hyper-duplex grade 7 *** three DSSs exhibited equiaxial austenite islands in the ferrite matrix and balanced phase *** hardness of the grade 7 A was nearly 15%higher than those of the super-duplex grades,which is attributed to the effect of the higher contents of W and Mn in 7 *** impact toughness of grade 7 A was found to be lower than those of the super-duplex grades due to the carbide precipitation resulting from the partial substitution of Mo with *** oxide layer strengthening effect of rare earth elements and the higher pitting resistance equivalent number(pREN)of grade7 A resulted in higher corrosion *** harder and more passive grade 7 A showed a 35%lower material loss during erosion-corrosion.

关键词： hyper-duplex stainless steels erosion−corrosion electrochemical corrosion marine environment super-duplex stainless steels

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Communications in Theoretical physics 2018年第8期69卷 197-208页

作者： p.k.Sahu Department of Mathematics Government Shyama Prasad Mukharjee College Sitapur-497111 Sarguja University

Similarity solution for a spherical shock wave with or without gravitational field in a dusty gas is studied under the action of monochromatic radiation. It is supposed that dusty gas be a mixture of perfect gas and micro solid particles. Equilibrium flow condition is supposed to be maintained and energy is varying which is continuously supplied by inner expanding surface. It is found that similarity solution exists under the constant initial density. The comparison between the solutions obtained in gravitating and non-gravitating medium is done. It is found that the shock strength increases with an increase in gravitational parameter or ratio of the density of solid particles to the initial density of the gas, whereas an increase in the radiation parameter has decaying effect on the shock waves.

关键词： spherical shock wave dusty gas similarity solution gravitational medium Roche model monochromatic radiation

Effect of Cold Deformation on phase Evolution and Mechanical properties in an Austenitic Stainless Steel for Structural and Safety Applications

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Journal of Iron and Steel Research International 2012年第4期19卷 63-68页

作者： S k Ghosh p Mallick p p Chattopadhyay Department of Metallurgy and Materials Engineering Bengal Engineering and Science UniversityShibpurHowrah 711 103India

The effects of cold deformation on the formation of strain induced α’ martensite and mechanical properties of an austenitic stainless steel have been examined.X-ray diffraction analysis has revealed that 30% and 40% cold rolling have resulted in the formation of 24% and 31.5% martensite *** investigation has demonstrated that the formation of martensite is enhanced with increase in the percent deformation at 0 ℃.Investigation of mechanical properties reveals that hardness,yield strength and tensile strength values increase where as percent elongation drops with increasing *** fractographic observation corroborates the tensile *** of sub-surface at the fractured end of the tensile sample manifests that void/microcrack nucleation occurs in the interfacial regions of the martensite phase as well as at the austenite-martensite interface

关键词： austenitic stainless steel cold deformation martensite mechanical property

production of pig iron from red mud waste fines using thermal plasma technology

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International Journal of Minerals,Metallurgy and Materials 2012年第8期19卷 679-684页

作者： k. Jayasankar p.k. Ray A.k. Chaubey A. padhi B.k. Satapathy p.S. Mukherjee CSIR-Institute of Minerals & Materials Technology Bhubaneswar India National Aluminum Company Ltd. Bhubaneswar India

Red mud, an insoluble residue produced during alkali leaching of bauxite, is considered as a low-grade iron ore containing 30% to 50% iron. The present paper deals with the use of thermal plasma technology for producing pig iron from red mud waste fines. The smelting reduction of red mud was carried out in a 35 kW DC extended arc thermal plasma reactor. Red mud was properly mixed with fluxes and graphite （fixed carbon, 99%） as a reductant as per stoichiometric requirement. The effect of various process parameters like a reductant, fluxes and smelting time on iron recovery was studied and optimized. An optimum condition for the maximum recovery of iron was obtained. A new thermal plasma process applicable to direct iron making from red mud waste fines that would achieve significant utilization of red mud was proposed.

关键词： pig iron waste utilization red mud smelting dolomite limestone thermal plasma

Impact of ultrasonic power on liquid fraction,microstructure and physical characteristics of A356 alloy molded through cooling slope

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Journal of Central South University 2022年第4期29卷 1098-1106页

作者： pabak mohapatra Nirmal kumar kUND Department of production Engineering VSS University of TechnologyBurla 768018India

This study involves A356 alloy molded through ultrasonically vibrated cooling *** slope alongside ultrasonic power enables indispensable shear for engendering slurry from which the semisolid cast/heat treated billets got *** examination demonstrates ultrasonically vibrated cooling slope influencing the liquid fraction/microstructure/physical characteristics of stated *** investigation encompasses five diverse ultrasonic powers(0,75,150,200,250 W).The ultrasonic power of 150 W delivers finest/rounded microstructure with enhanced physical *** modifications reason physical transformations because of grain refinement and grain boundary/Hall-petch strengthening.A smaller grain size reasons a higher strength/shape factor and an increased homogeneity reasons a higher *** characteristics get improved by *** is owing to coalescence throughout temperature *** physical characteristics is improved by reheating because of a reduced porosity and enhanced dissolution besides augmented homogeneity.A direct comparison remains impossible owing to unavailability of researches on ultrasonically vibrated cooling slope.

关键词： ultrasonic power microstructure physical characteristics semisolid cast A356 alloy cooling slope

Characterization of Vacuum Ultraviolet (VUV) Radiation for the Development of a Fluorescent Lamp

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plasma Science and Technology 2011年第4期13卷 480-485页

作者： Hasina kHATUN A.k.SHARMA p.k.BARHAI Microwave Tubes Area Central Electronics Engineering Research Institute Applied physic Department Birla Institute of Technology

A negative unipolar pulsed voltage is applied to study internal electrical parameters of the xenon filled dielectric barrier discharge （DBD） sources. The VUV radiation emitted from these sources is characterized by means of the photoluminescence intensity of the red phosphor pellet. The red phosphor converts the VUV radiation into visible radiation and the emission spectra include a peak at 619.56 nm. The emission characteristics of the red phosphor are analyzed in terms of the pressure-distance （pd）, rise time and frequency of the pulsed voltage waveform. The emission intensity measured at different operational conditions confirms that the formation and decay of the xenon excimer, Xe2^＊, increase with the increase in reduced electric field, E/N. After exceeding certain limits of E/N, the intensity of Xe2^＊ decreases rapidly.

关键词： dielectric barrier discharge vacuum ultraviolet photoluminescence RGB

Solitary kinetic Alfven waves in dense plasmas with relativistic degenerate electrons and positrons

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plasma Science and Technology 2019年第4期21卷 85-93页

作者： Monzurul k AHMED Om p SAH Department of physics Biijhora MahavidyalayaBongaigaon-783380AssamIndia

propagation of solitary kinetic Alfven waves(kAWs)is investigated in small but finite/3(particle-to-magnetic pressure ratio)collisionless dense plasma whose constituents are non degenerate wann ions,and relativistic degenerate electrons and *** the use of reductive perturbation technique,kortweg-de Vries equation is derived to obtain small amplitude localized wave solution of *** effects of plasma 0,positron concentration,electron relativistic degeneracy parameter,ion thermal temperature and obliqueness parameter on solitary kAWs are *** results of this theoretical investigation are aimed at elucidating characteristics of kinetic Alfven solitary waves in relativistic degenerate e-p-i plasmas found in dense astrophysical objects specifically neutron stars and white dwarfs.

关键词： solitary kinetic Alfven waves dense plasmas electron-positron-ion plasma,relativistic degenerate plasma reductive perturbation technique

Systematic study on heavy-particle radioactivity of superheavy nuclei ^(297–300)119

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Nuclear Science and Techniques 2024年第11期35卷 108-123页

作者： Megha Chandran V.k.Anjali k.p.Santhosh Department of physics University of CalicutThenhipalamKerala 673635India School of pure and Applied physics Kannur UniversitySwami Anandatheertha CampusPayyanurKerala 670327India

In the current study,we examined every possible cluster-daughter combination in the heavy-particle decay of isotopes ^(297-300)119 and computed the decay half-lives using the modified generalized liquid drop model(MGLDM)with the preformation factor depending on the disintegration *** predicted half-life of every heavy cluster(Z_(C)≥32)was within the experimentally observable *** results aligned with the predictions of poenaru et al.[***.107,062503(2011)]that superheavy nuclei(SHN)with Z>110 will release heavy particles with a penetrability comparable to or greater than theα-*** half-lives predicted using the MGLDM for clusters^(89)Rb,^(91)Rb,and^(92)Rb from parents^(297)119,^(299)119,and^(300)119,respectively,agreed with the predictions of poenaru et al.[***.J.A 54,14(2018)].It was found that the isotopes of heavy clusters kr,Rb,Sr,pa,In,and Cd had half-lives comparable to theαhalf-life;and isotopes of clusters I,Xe,and Cs had the minimum half-life(10^(-14)s).These observations revealed the role of the shell closure(Z=82,N=82,and N=126)of the cluster and daughter nuclei in heavy-cluster *** predicted that isotope ^(297,299)119 decayed by 4αdecay chains and isotope^(300)119 decayed by 6αdecay chains,while^(298)119 decayed by continuousαdecay *** predicted half-lives and modes of decay of the nuclei in the decay chains of^(297-300)119 agreed with the experimental data,proving the reliability of our *** present study determined the most favorable heavy-cluster emissions from these nuclei and provided suitable projectile-target combinations for their synthesis.

关键词： Cluster radioactivity Alpha radioactivity Superheavy nuclei