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Bending sensor based on flexible spin valve

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Chinese Physics B 2023年第5期32卷 655-661页

作者： L i naumova R S Zavornitsyn m A milyaev n G Bebenin A Y Pavlova m V makarova i K maksimova V V Proglyado A A Zakharov V V Ustinov m.n.miheev institute of metal Physics Ural BranchRussian Academy of SciencesS.Kovalevskoi Street 18Ekaterinburg 620990Russia

Flexible spin valves were prepared by magnetron sputtering on polyimide substrates. The buffer layer that reduces significantly the effect of the polymer substrate on the spin valve microstructure and magnetoresistive properties was revealed. Bending deformation was applied to the microobjects based on the flexible spin valves in parallel to anisotropy axes. it was revealed that during the bend the magnetoresistance changes due to the joint impact of both the change of the magnetic field projection on the film plane and the change of the magnetic properties of the ferromagnetic layers. The obtained dependences have been used in construction of bending sensor, in which the flexible spin valve microstripes were united into the Wheatstone bridge.

关键词： spin valve polymer substrate magnetostriction magnetic anisotropy

High Order Block method for Third Order ODEs

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Computers, materials & Continua 2021年第4期67卷 1253-1267页

作者： A.i.Asnor S.A.m.Yatim Z.B.ibrahim n.Zainuddin School of Distance Education Universiti Sains MalaysiaUSM Penang11800Malaysia Department of mathematics Faculty of ScienceUniversiti Putra MalaysiaSerdangSelangor Darul Ehsan43400Malaysia Department of Fundamental and Applied Sciences Universiti Teknologi PETRONASSeri IskandarPerak Darul Ridzuan32610Malaysia

many initial value problems are difficult to be solved using ordinary,explicit step-by-step methods because most of these problems are considered *** implicit methods,however,are capable of solving stiff ordinary differential equations(ODEs)usually found in most applied *** study aims to develop a new numerical method,namely the high order variable step variable order block backward differentiation formula(VSVOHOBBDF)for the main purpose of approximating the solutions of third order *** computational work of the VSVO-HOBBDF method was carried out using the strategy of varying the step size and order in a single *** order of the proposed method was then discussed in *** advancem.nt of this strategy is intended to enhance the efficiency of the proposed method to approximate solutions *** order to confirm the efficiency of the VSVO-HOBBDF method over the two ODE solvers in mATLAB,particularly ode15s and ode23s,a numerical experiment was conducted on a set of stiff *** numerical results prove that for this particular set of problem,the use of the proposed method is more efficient than the comparable ***-HOBBDF method is thus recommended as a reliable alternative solver for the third order ODEs.

关键词： Block method stiff ODEs third order variable step variable order

Effect of proton irradiation on the optical properties of thermal control coating based on polystyrene with silica filler

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Propulsion and Power Research 2024年第1期13卷 1-11页

作者： n.i.Cherkashina V.i.Pavlenko m.m.mikhailov A.n.Lapin S.A.Yuriev R.V.Sidelnikov D.S.Romanyuk Belgorod State Technological University named after V.G.Shoukhov Kostyukov Str.46Belgorod 308012Russia Tomsk State University of Control Systems and Radioelectronics 40Prospect LeninaTomsk 634050Russia

This paper presents the results of studying the surface properties changes of a ther-moregulating coating based on polystyrene and silicafiller after proton irradiation with an en-ergy of 50 keV at afluence of 3�1015 cm�*** proton irradiation,the values of the contact angle of wetting with water increase by 3.5%and 14.9%for polystyrene and the coating,*** free surface energy(energy of the surface layer)of polystyrene and the coat-ings before and after proton irradiation was calculated using the Owens-Wendt-Rabel-Kaelble *** was a significant increase in the polarity of the polystyrene surface(gp increased by a factor of 2.2)after proton *** the coating,an increase in gp by a factor of 3.89 was observed after proton *** changes in the coating were presented by iR Fourier spectroscopy.A slight decrease in the absorption intensity of all characteristic bands compared to the unirradiated sample was *** was found that the irradiation of the coating with protons led to the formation of macromolecules with hydroxyl,carbonyl,and carboxyl bonds,as well as the formation of dimeric and oligomeric siloxane *** was also found that after irradiation of a pure polystyrene sample with protons,the value of the solar absorption as increased by only 4.2%;whereas for the coating with silicafiller,the value of as increased by 28.6%.

关键词： Thermal control coating Proton irradiation Hydrophobicity Free surface energy Radiation crosslinking

Thermoluminescence Response of Germanium-Doped Optical Fibers to X-Ray irradiation

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Chinese Physics Letters 2012年第7期29卷 284-286页

作者： m.A.Saeed n.A.Fauzia i.Hossain A.T.Ramli B.A.Tahir Department of Physics Universiti Teknologi MalaysiaSkudai-81310JohorMalaysia Department of Physics College of Sciences and ArtsKing Abdulaziz UniversityRabigh 21911P.O.Box No.344KSA

We present the characteristics of the thermoluminescence (TL) response of Ge-doped optical fibers with various energies and exposures of photon *** investigate the Ge-doped SiO2 as an efficient TL material,the TL responses are compared with commercially available standard TLD100 *** Ge-doped optical fiber and TLD100 are placed in gelatin capsules and irradiated with x-ray using a Toshiba model KXO-15R x-ray *** Ge-doped fiber and TLD-100 show linear response as a function of current and time using x-ray photon of energy 60,80 and *** irradiated with 60,80 and l00kV x-ray energy at various currents (mA ),tube distance (cm) and exposure time (second) ranges,TLD100 media provide a TL yield up to two times that of Ge-doped *** energy response of the Ge-doped fibers is linear and similar over the 60-l00 kVenergy range,and its sensitivity is 0.39±0.05 of the TLD100 *** glow curves of TLD 100 and doped optical fiber are also compared.

关键词： fiber fibers photon

Constraining the f(R,T)=R+2λT cosmological model using recent observational data

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Chinese Physics C 2023年第11期47卷 167-176页

作者： n.myrzakulov m.Koussour Alnadhief H.A.Alfedeel E.i.Hassan L.n.Gumilyov Eurasian national University Astana 010008Kazakhstan Ratbay myrzakulov Eurasian international Centre for Theoretical Physics Astana 010009Kazakhstan Quantum Physics and magnetism Team LPMCFaculty of Science Ben M'sikCasablanca Hassan II UniversityMorocco Department of mathematics and Statistics Imam Mohammad Ibn Saud Islamic University(IMSIU)Riyadh 13318Saudi Arabia Department of Physics Faculty of ScienceUniversity of KhartoumP.O.Box 321Khartoum 11115Sudan Centre for Space Research North-West UniversityPotchefstroom 2520South Africa

in this study,we conduct a comprehensive investigation of the cosmological model described by f(R,T)=R+2λT(whereλrepresents a free parameter)in light of the most recent observational *** constraining the model using the Hubble and Pantheon datasets,we determine its compatibility with the observed behavior of the *** this purpose,we adopt a parametric form for the effective equation of state(EoS)*** parametric form allows us to describe the evolution of the EoS parameter with respect to redshift and investigate its behavior during different cosmic *** analysis of the deceleration parameter reveals an accelerating Universe with a present value of q0=−0.64_(−0.03)^(+0.03),indicating the current phase of accelerated *** transition redshift is found to be ztr=0.53_(−0.03)^(+0.04),marking the epoch of transition from deceleration to *** also analyze the evolution of important cosmological parameters,including the density parameter,pressure,effective EoS,and *** findings collectively dem.nstrate the viability of the f(R,T)cosmological model as a robust candidate capable of engendering the requisite negative pressure,thereby efficiently propelling cosmic ***,the undertaken stability analysis underscores the model's stability within the broader cosmic *** providing the best-fit values for the coupling parameterλ,this approach motivates and encourages further exploration into the extensive landscape of this model and its potential applications across diverse realms of cosmology and astronomy.

关键词： f(R,T)gravity EoS parameter observational constraints dark energy

Erosion,sediment transportation and accumulation in rivers

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international Journal of Sediment Research 2008年第2期23卷 93-105页

作者： n.i.ALEKSEEVSKiY K.m.BERKOViCH R.S.CHALOV Head of the Hydrology Department Faculty of GeographyMoscow State UniversityMoscowRussiaProf Leading researcher Lab.of Soil Erosion and Fluvial ProcessesFaculty of GeographyMoscow State UniversityMoscowRussiaProf Head of the Lab.of Soil Erosion and Fluvial Processes Faculty of GeographyMoscow State UniversityMoscowRussiaProf

The present paper analyses the interrelation between erosion,sediment transportation and accumulation proposed by *** (1908-1983) and its further development in modern studies of river channel processes in ***-temporal linkages between erosion and accumulation are defined considering channel processes at different scales - river longitudinal profile,channel morphological patterns,alluvial bedforms (bars,dunes) and individual sediment *** between river geomorphic activity,flow transportation capacity and sediment budgets are established (sediment input and output; channel bed erosion and sediment entrainment into flow - termination of sediment transport and its deposition).Channel planforms,floodplain segments separated by the latter and alluvial channel bedforms are shown to be geomorphic expressions of sediment transport process at different spatial and temporal *** paper is dedicated to the 100th anniversary of ***,Professor of the moscow State University,author of the book "River channel and erosion in its basin" (1955).That book is regarded in Russia as the pioneering work which initiated the complex hydrological and geographical studies of channel processes and laid a basis for the theory of unified fluvial erosion-accumulation process.

关键词： Channel processes Sediment Erosion and accumulation Longitudinal profile River channel patterns Channel bed morphology

Phase composition,conductivity,and sensor properties of cerium-doped indium oxide

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nano materials Science 2024年第2期6卷 193-200页

作者： m.i.ikim G.n.Gerasimov V.F.Gromov O.J.ilegbusi L.i.Trakhtenberg n.n.Sem.nov Federal Research Center for Chemical Physics of RAS MoscowRussia University of Central Florida OrlandoFLUSA moscow institute of Physics and Technology(State University) DolgoprudnyMoscow RegionRussia Lomonosov moscow State University MoscowRussia

The hydrothermal synthesis of in_(2)O_(3)and CeO_(2)–in_(2)O_(3)is investigated as well as the properties of sensor layers based on these *** the synthesis of in_(2)O_(3),intermediate products in(OH)_(3)and inOOH are formed,which are the precursors of stable cubic(c-in_(2)O_(3))and metastable rhombohedral(rh-in_(2)O_(3))phases,respectively.A transition from c-in_(2)O_(3)to rh-in_(2)O_(3)is observed with the addition of CeO_(2).The introduction of cerium into rh-in_(2)O_(3)results in a decrease in the sensor response to hydrogen,while it increases in composites based on c-in_(2)O_(3).The data on the sensor activity of the composites correlate with XPS results in which CeO_(2)causes a decrease in the concentrations of chemisorbed oxygen and oxygen vacancies in rh-in_(2)O_(3).The reverse situation is observed in composites based on c-in_(2)O_(3).Compared to in_(2)O_(3)and CeO_(2)–in_(2)O_(3)obtained by other methods,the synthesized composites dem.nstrate maximum response to H_(2)at low temperatures by 70–100℃,and have short response time(0.2–0.5 s),short recovery time(6–7 s),and long-term stability.A model is proposed for the dependence of sensitivity on the direction of electron transfer between in_(2)O_(3)and CeO_(2).

关键词： Cerium oxide indium oxide nanocomposite Hydrothermal method Cubic phase Rhombohedral phase Sensor response Conductivity Hydrogen Response/recovery time

Self-Starting Harmonic mode-Locked Thulium-Doped Fiber Laser with Carbon nanotubes Saturable Absorber

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Chinese Physics Letters 2013年第9期30卷 69-71页

作者： S.W.Harun n.Saidin D.i.m.Zen n.m.Ali H.Ahmad F.Ahmad K.Dimyati Photonics Research Centre University of Malaya 50603 Kuala LumpurMalaysia Department of Electrical Engineering University of Malaya50603 Kuala LumpurMalaysia Department of Electrical and Electronic Engineering National Defense University of MalaysiaKem Sungai Besi57000 Kuala LumpurMalaysia

We report a ring cavity passively harmonic mode-locked thulium-doped fiber laser(TDFL)using a newly devel-oped single-wall carbon nanotube-based saturable *** TDFL generates the 25 th harmonic mode-locked stretched pulse train with a high repetition rate of 213mHz and a pulse duration of *** laser operates at 1901.6nm with an average power of 1.89mW,which corresponds to the pulse energy of 0.008nJ,at 1552nm pump power of *** peak-to-background ratio is measured to be 60dB,which indicates the stability of the laser.

关键词： pulse pump passive

Differential response of injured and healthy retinas to syngeneic and allogeneic transplantation of a clonal cell line of immortalized olfactory ensheathing glia:a double-edged sword

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neural Regeneration Research 2025年第8期20卷 2395-2407页

作者： maría norte-muñoz maría Portela-Lomba Paloma Sobrado-Calvo Diana Simón Johnny Di Pierdomenico Alejandro Gallego-Ortega mar Pérez JosémCabrera-maqueda Javier Sierra manuel Vidal-Sanz maría Teresa moreno-Flores marta Agudo-Barriuso Grupo de investigación Oftalmología Experimental Departamento de OftalmologíaOptometríaOtorrinolaringología y Anatomía PatológicaFacultad de MedicinaUniversidad de MurciaInstituto Murciano de Investigación Biosanitaria(IMIB)Campus de Ciencias de la SaludMurciaSpain Experimental Sciences Faculty Universidad Francisco de VitoriaPozuelo de AlarcónMadridSpain Anatomy Histology and Neuroscience DepartmentMedicine FacultyUniversidad Autónoma de MadridMadridSpain Center of neuroimmunology Service of NeurologyLaboratory of Advanced Imaging in Neuroimmunological DiseasesHospital Clínic of BarcelonaInstitut d’Investigacions Biomèdiques August Pi i Sunyer(IDIBAPS)and Universitat de BarcelonaBarcelonaSpain medicine Faculty Universidad Francisco de VitoriaPozuelo de AlarcónMadridSpain

Olfactory ensheathing glia promote axonal regeneration in the mammalian central nervous system,including retinal ganglion cell axonal growth through the injured optic ***,it is unknown whether olfactory ensheathing glia also have neuroprotective *** ensheathing glia express brain-derived neurotrophic factor,one of the best neuroprotectants for axotomized retinal ganglion ***,we aimed to investigate the neuroprotective capacity of olfactory ensheating glia after optic nerve *** ensheathing glia cells from an established rat immortalized clonal cell line,TEG3,were intravitreally injected in intact and axotomized retinas in syngeneic and allogeneic mode with or without microglial inhibition or immunosuppressive *** and gene expression analyses were *** bulb-derived primary olfactory ensheathing glia and TEG3 express major histocompatibility complex classⅡ*** and syngenically transplanted TEG3 cells survived in the vitreous for up to 21 days,forming an *** axotomized retinas,only the allogeneic TEG3 transplant rescued retinal ganglion cells at 7 days but not at 21 *** these retinas,microglial anatomical activation was higher than after optic nerve crush *** intact retinas,both transplants activated microglial cells and caused retinal ganglion cell death at 21 days,a loss that was higher after allotransplantation,triggered by pyroptosis and partially rescued by microglial inhibition or ***,neuroprotection of axotomized retinal ganglion cells did not improve with these *** different neuroprotective properties,different toxic effects,and different responses to microglial inhibitory treatments of olfactory ensheathing glia in the retina depending on the type of transplant highlight the importance of thorough preclinical studies to explore these variables.

关键词： cell therapy immune recognition major histocompatibility complex class ii(mHCii) neuroprotection olfactory ensheathing glia retinal ganglion cells