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High Voltage 2017年第3期2卷 205-210页

作者： Rahmat Ullah Abdur Rashid Arooj Rashid Faisal khan Amjad Ali Department of Electrical Engineering CIIT AbbottabadPakistan

In this study,dichlorodifluoromethane(R12)gas and mixtures with nitrogen(n_(2))and air at different pressures and mixing ratios have been investigated and showed good alternative to SF_(6) gas in terms of high-voltage *** gases contain R12 gas,they offer good dielectric properties and possibility to be used in low-temperature *** effects and self-recoverability test have been *** strength under quasi-uniform field showed in the order of SF_(6)>R12>n_(2)>air in alternating current(AC),direct current(DC)and impulse was *** R12/n_(2)(80/20%)could reach over 0.90–0.95 times to that of SF_(6) gas at 50 lb/in^(2) at AC and R12/air(70/30%)gives 0.80–0.90 to SF_(6) gas.R12 gas presents brilliant *** optimal ratio to switch SF_(6) gas is R12/n_(2)(80/20%)and R12/air(70/30%)is based on the authors’experimental condition and setup.

关键词： characteristic mixture mixing

Systematic study of Ce^(3+) on the structural and magnetic properties of Cu nanosized ferrites for potential applications

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Journal of Rare Earths 2018年第2期36卷 156-164页

作者： Majid niaz Akhtar A.B.Sulong M.n.Akhtar Muhammad Azhar khan Department of Physics Muhammad Nawaz Sharif University of Engineering and Technology (MNSUET) Department of Mechanical and Materials Engineering Faculty of Engineering and Built Environment Universiti Kebangsaan Malaysia (UKM) Institute of Pure and Applied Biology Department of ZoologyBahaudin Zakariya University Department of Physics The Islamia University of Bahawalpur

Ce^（3＋） substituted Cu-spinel nanoferrites CuCe_xFe_（2-x）O_4（x=0.00, 0.02, 0.04, 0.06, 0.08 and 0.10） were synthesized via sol-gel self-combustion hybrid route. Single phase spinel ferrite of Cu nanoferrites were examined using X-ray diffraction（XRD） analysis whereas the multiphase structure was observed as Ce contents increased from x=0.06. Field emission scanning electron microscopy（FESEM）, Thermogravimetric and differential thermal analysis（TGA and DTA） and Fourier transform infrared spectroscopy（FTIR） were used to find out the morphology phase and metal stretching vibrations of Ce^（3＋） substituted nanocrystalline ferrites. The crystallite size was increased and found in the range of 25-91 nm. The agglomerations in Cu ferrite samples increase as the Ce^（3＋） concentration increases. The magnetic properties such as remanence, saturation magnetization, coercivity, Bohr magneton and magnetocrystalline anisotropy constant（K） were determined using M-H loops recorded from a vibrating sample magnetometer（VSM）. Saturation magnetization, remanence and coercivity are increased as the Ce^（3＋）contents increase in Cu nanocrystalline samples. Moreover, law of approach to saturation（LoA） was used to calculate the maximum value of saturation for Ce-doped Cu nanoferrites. The soft magnetic behaviour of the Cu nanoferrite is observed as compared to the samples substituted with the increased Ce contents in Cu nanocrystalline ferrite. Bohr magneton and magnetocrystalline anisotropy are found to increase with the substitution of rare earth Ce^（3＋） contents in Cu spinel nanocrystalline ferrite. Cedoped Cu nanocrystalline ferrites with excellent properties may be suitable for potential applications in sensing, security, switching, core, multilayer chip inductor, biomedical and microwave absorption applications.

关键词： Ce-doped Cu nanocrystalline ferrites X-ray diffraction(XRD) Scanning electron microscopy(SEM) Transmission electron microscopy(TEM) Fourier transform infrared(FTIR) Vibrating sample magnetometer(VSM)

Deep learning approach to detect seizure using reconstructed phase space images

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The Journal of Biomedical Research 2020年第3期34卷 240-250页

作者： n.Ilakiyaselvan A.nayeemulla khan A.Shahina School of Computer Science and Engineering Vellore Institute of TechnologyChennaiTamilnadu 600127India Department of Information Technology SSN College of EngineeringKalavakkamTamilnadu 603110India

Epilepsy is a chronic neurological disorder that affects the function of the brain in people of all *** manifests in the electroencephalogram(EEG) signal which records the electrical activity of the *** image processing,signal processing,and machine-learning based techniques are employed to analyze epilepsy,using spatial and temporal *** nervous system that generates the EEG signal is considered nonlinear and the EEG signals exhibit chaotic *** order to capture these nonlinear dynamics,we use reconstructed phase space(RPS) representation of the *** studies have primarily addressed seizure detection as a binary classification(normal ***) problem and rarely as a ternary class(normal *** ***)*** employ transfer learning on a pre-trained deep neural network model and retrain it using RPS images of the EEG *** classification accuracy of the model for the binary classes is(98.5±1.5)% and(95±2)% for the ternary *** performance of the convolution neural network(Cnn) model is better than the other existing statistical approach for all performance indicators such as accuracy,sensitivity,and *** result of the proposed approach shows the prospect of employing RPS images with Cnn for predicting epileptic seizures.

关键词： epilepsy reconstructed phase space convolution neural network reconstructed phase space image Alexnet seizure

Phase analysis of AlFe2B2 by synchrotron X-ray diffraction,magnetic and M?ssbauer studies

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Progress in natural Science:Materials International 2017年第2期27卷 251-256页

作者： Tahir Ali M.n.khan E.Ahmed Asad Ali Physics Division Pakistan Institute of Nuclear Science and technology Department of Physics Abdul Wali khan University PInSAT Preston University

The structural and magnetic properties of essentially phase pure AlFe2B2prepared by arc melting were compared with a sample containing impurities. Analysis was carried out by means of synchrotron X-ray diffraction, magnetic measurements and M?ssbauer spectroscopy. The analysis of synchrotron X-ray diffraction data confirmed the orthorhombic structure of space group Cmmm for AlFe2B2with Al13Fe4as main impurity phase. The magnetic measurements revealed an unsaturated ferromagnetic state in AlFe2B2with a transition temperature（Tc） of 286 K. Isothermal magnetization measurment at 5 K gave a saturation magnetization of 0.7 μB per Fe atom while Arrott plots establish the second order nature of ferromagnetic transition. The thermal evolution of M?ssbauer spectra confirmed the ferromagnetic nature of this material revealing an hyperfine field of 73 kOe and an isomer shift of 0.46 mm/s at 100 K. The M?ssbauer spectra of a phase pure sample was compared with the one containing impurity phases. It is suggested that the low temperature paramagnetic contribution in M?ssbauer spectra of phase pure material may have its origin in some intrinsic phenomena arising from defects or inhomogeneities in crystal structure.

关键词： AlFe2B2 Synchrotron X-ray diffraction Ferromagnetism Mossbauer effect spectroscopy

Acceleration of solar wind particles due to inertial Alfvén waves

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Communications in Theoretical Physics 2024年第6期76卷 137-141页

作者： Kiran Batool Imran.a.khan M Shamir Abdul Kabir S Ayaz Theoretical Physics Department National Centre for PhysicsIslamabad 44000Pakistan Department of Space Sciences Institute of Space TechnologyIslamabad 44000Pakistan Space and Astrophysics Research Lab(SARL) National Center of GIS and Space Applications(NCGSA)Islamabad 44000Pakistan Salam Chair Department of PhysicsGC University LahoreKatchery RoadLahorePunjab 54000Pakistan Department of Space Science and CSPAR University of Alabama in HuntsvilleHuntsvilleAL 35899United States of America

Gaining an understanding of the effects and dynamics of the solar wind is crucial for the study of space weather,Earth's magnetosphere,spacecraft protection,the dynamics of the Solar System,and various other *** show that Alfvén waves effectively transfer energy to resonant *** study demonstrates how inertial Alfvén waves deliver their energy to resonant plasma particles in different solar environments under certain *** analysis shows that inertial Alfvén waves experience more rapid damping with increasing parallel wavenumber,ambient magnetic field strength,and particle number density,coupled with a decrease in *** rate of energy transfer to resonant particles intensifies with higher temperatures and reduced parallel wavenumber and particle number *** with higher initial velocities actively participate in Landau damping,especially in regions with a stronger ambient magnetic field.

关键词： solar wind inertial Alfven waves resonant particles

Dendritic spine degeneration:a primary mechanism in the aging process

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neural Regeneration Research 2025年第6期20卷 1696-1698页

作者： Gonzalo Flores Leonardo Aguilar-Hernández Fernado García-Dolores Humberto nicolini Andrea Judith Vázquez-Hernández Hiram Tendilla-Beltrán Instituto de Fisiología Benemérita Universidad Autónoma de Puebla(BUAP)PueblaMexico Instituto de Ciencias Forenses(InCIFO) Tribunal Superior de Justicia de la Ciudad de México(TSJCDMX).Mexico CityMexico Instituto nacional de Medicina Genómica(InMEGEn) Mexico CityMexico

Recent reports suggest that aging is not solely a physiological process in living beings;instead, it should be considered a pathological process or disease(Amorim et al., 2022). Consequently, this process involves a wide range of factors, spanning from genetic to environmental factors, and even includes the gut microbiome(GM)(Mayer et al., 2022). All these processes coincide at some point in the inflammatory process, oxidative stress, and apoptosis, at different degrees in various organs and systems that constitute a living organism(Mayer et al., 2022;AguilarHernández et al., 2023).

关键词： aging process stress

Implication of 14-3-3ζ-BDnF pathway in long-lasting memory enhancement and the rescue from memory deficits

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neural Regeneration Research 2022年第12期17卷 2685-2686页

作者： Mariam Masmudi-Martín Irene navarro-Lobato Zafar U.khan Brain Metastasis Group National Cancer Research Centre(CNIO)MadridSpain Donders Institute for Brain Cognition and Behaviour Radboud UniversityNijmegenThe Netherlands Laboratory of neurobiology CIMESUniversity of MalagaMalagaSpain Department of Medicine Faculty of MedicineUniversity of MalagaMalagaSpain CIBERnED Institute of Health Carlos ⅢMadridSpain

Intact memory function is critical for carrying out daily life activities,such as managing finances,remembering to take medications,driving in familiar environments,remembering a grandchild’s birthday,and learning to use a new ***,memory deficits not only accompany normal aging but are also comorbid with many psychiatric,neurological,and neurodegenerative *** disability,autism,attention deficit disorder,learning disability,schizophrenia,and depression all have memory deficit components,as do Alzheimer’s disease,Parkinson’s disease,Huntington’s disease,and other neurodegenerative diseases(khan et al.,2014).Therefore,a large proportion of the human population is affected by this brain disorder.

关键词： Huntington remember finance

Phylogenetic Analysis of the neuraminidase Gene Reveals that the H5n1 Strains Prevalent in Chickens During 2006 Bird Flu Outbreaks in Two Regions of Maharashtra, India Are Genetically Different

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Genomics, Proteomics & Bioinformatics 2009年第1期7卷 57-61页

作者： Mohd Danishuddin Asad U. khan Interdisciplinary Biotechnology Unit Aligarh Muslim University

In February 2006, two outbreaks of highly pathogenic avian influenza A virus subtype H5n1 occurred in chickens in two neighboring districts （first in nandurbar and second in Jalgaon） of Maharashtra, India, in a span of 12 days. In the present study, the neuraminidase （nA） gene of the two Indian H5n1 isolates was taken into consideration to find if the two strains are genetically similar. Phylogenetic analysis of the nA gene showed that the H5n1 strains isolated from the two outbreaks were not originated from the same source. The first Indian isolate （nandubar/7972/06） was clustered closest to an isolate from chicken in Vietnam in 2004, whereas the second Indian isolate （Jalgaon/8824/06） showed resemblance to strains isolated from swan in Italy and Iran in 2006. Moreover, amino acid sequence analysis showed varying hot spots for substitutions between these two Indian isolates, and three substitutions were found at functional domain sites. Secondary structure changes due to these substitutions were also reported. This study reveals that the H5n1 strains isolated from chickens during 2006 bird flu outbreaks in two neighboring districts of Maharashtra, India are genetically different.

关键词： avian influenza virus H5n1 neuraminidase phylogeny mutation

Synthesis of nanostructured Mg-ni Alloy and Its Hydrogen Storage Properties

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Journal of Materials Science & Technology 2012年第5期28卷 401-406页

作者： n.A. niaz I. Ahmad Waheed S. khan S. Tajammul Hussain Department of Physics COMSATS Institute of Information Technology Islamabad Pakistan Research Centre of Materials Science School of Materials Science and Engineering Beijing Institute of Technology national Centre for Physics Qaid-a-Azam University Islamabad Pakistan

nanostructured Mg–ni alloy with the particle size in the range of 40–50 nm was synthesized by the thermal decomposition of bipyridyl complexes of Mg and ni metals at 773 K for 24 h under dry argon gas ambient. The as-prepared nano-alloy was characterized by X-ray diffraction （XRD）, scanning electron microscopy （SEM） and transmission electron microscopy （TEM） for compositional and structural analysis. The alloy exhibited superior hydrogen absorption and desorption behavior with 3.2 wt% absorption within 1 min at 573 K and about 3 wt% desorption within 5–10 min at 573 K. This favorable behavior of Mg–ni compound for the hydrogen storage is due to the specific nanostructure of the material. The low activation energy values and favorable thermodynamics indicate that the prepared Mg–ni alloy is an attracting material for hydrogen storage applications.

关键词： Mg-ni alloy Hydrogen storage Pressure-composition-temperature (P-C-T) measurements Transmission electron microscopy

Development of Wheel-less Snake Robot with Two Distinct Gaits and Gait Transition Capability

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International Journal of Automation and computing 2013年第6期10卷 534-544页

作者： M.H.A.Majid M.R.khan S.n.Sidek Department of Mechatronics Engineering International Islamic University Malaysia

Snake robots are mostly designed based on single mode locomotion. However, single mode gait most likely could not work effectively when the robot is subject to an unstructured working environment with different measures of terrain complexity. As a solution, mixed mode locomotion is proposed in this paper by synchronizing two types of gaits known as serpentine and wriggler gaits used for non-constricted and narrow space environments, respectively, but for straight line locomotion only. A gait transition algorithm is developed to efficiently change the gait from one to another. This study includes the investigation on kinematics analysis followed by dynamics analysis while considering related structural constraints for both gaits. The approach utilizes the speed of the serpentine gait for open area locomotion and exploits the narrow space access capability of the wriggler gait. Hence, it can increase motion flexibility in view of the fact that the robot is able to change its mode of locomotion according to the working environment.

关键词： Bio-inspired robots robotics robot dynamics robot kinematics robotic mechanical systems.