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Dielectric relaxation and conduction behaviors of Aurivillius Na_(0.5)Bi_(4.5)Ti_(4)O_(15) ceramics with Na doping

Rare Metals 2021年第5期40卷 1247-1254页

作者： Fida Rehman Jing-Bo Li Pervaiz Ahmed Muhammad Sheraz Khan yasir saeed Asma khan Muhammad Zubair Beijing Key Laboratory of Construction Tailorable Advanced Functional Materials and Green Applications School of Materials Science and EngineeringBeijing Institute of TechnologyBeijing 100081China Department of Physics Abbottabad University of Science&TechnologyHavelian 22500Pakistan Department of Physics University of Azad Jammu and KashmirMuzafarabad 13100Pakistan Beijing Key Lab of Nanophotonics and Ultrafine Optoelectronic Systems and School of Physics Beijing Institute of TechnologyBeijing 100081China Department of Chemistry Abbottabad University of Science&TechnologyHavelian 22500Pakistan Key Laboratory of Advanced Functional Materials College of Materials Science and EngineeringMinistry of EducationBeijing University of TechnologyBeijing 100124China

Aurivillius Na_(0.5)Bi_(4.5)Ti_(4)O_(15) and Bi_(4)Ti_(3)O_(12)compounds were synthesized via solid-state reaction technique.X-ray powder diffraction study confirmed monophasic four-layered Na_(0.5)Bi_(4.5)Ti_(4)O_(15) and three-layered Bi_(4)Ti_(3)O_(12) *** relaxation and conduction behaviors of Na-contained Na_(0.5)Bi_(4.5)Ti_(4)O_(15)ceramics were thoroughly investigated in a large scale of temperature of 30-650℃ and frequency of 40 Hz^(-1) *** addition,comparative studies of both the compounds were *** and modulus analyses revealed a single relaxation behavior in Na_(0.5)Bi_(4.5)Ti_(4)O_(15) compound which was originated from the grain’s interior with grain resistance of 2.189×10^(5)Ω and capacitance of 4.268×10^(-10) F at 570℃.While in Bi_(4)Ti_(3)O_(12) ceramic the relaxation was due to the contributions of grain and grain *** current(AC)conductivity analysis revealed the presence of two different conduction regions in both the *** energies for the two different conduction mechanisms,i.e.,in low-temperature region and in high-temperature region were calculated to be~0.23 and~1.27 eV at 1 kHz for Na_(0.5)Bi_(4.5)Ti_(4)O_(15) compound and~0.43 eV and~0.97 eV at 1 kHz for Bi_(4)Ti_(3)O_(12) compound,*** present study of dielectric relaxation and conduction behaviors would be helpful for further investigations of Na_(0.5)Bi_(4.5)Ti_(4)O_(15)-related Aurivillius compounds.

关键词： Na_(0.5)Bi_(4.5)Ti_(4)O_(15) Electronic ceramics Dielectric Impedance Electrical properties

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Global stability of SEIVR epidemic model with generalized incidence and preventive vaccination

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International Journal of Biomathematics 2015年第6期8卷 203-221页

作者： Muhammad Altaf Khan yasir Khan Qaiser Badshah saeed Islam Department of Mathematics Abdul Wali Khan University Mardan Khyber Pakhtunkhwa 23200 Pakistan Department of Mathematics University of Haft Al-Batin Haft Al-Batin 31991 Saudi Arabia Department of Mathematics Abdul Wall Khan University Mardan Khyber Pakhtunkhwa 23200 Pakistan

In this paper, an SEIVR epidemic model with generalized incidence and preventive vaccination is considered. First, we formulate the model and obtain its basic properties. Then, we find the equilibrium points of the model, the disease-free and the endemic equilibrium. The stability of disease-free and endemic equilibrium is associated with the basic reproduction number R0. If the basic reproduction number R0〈 1, the disease- free equilibrium is locally as well as globally asymptotically stable. Moreover, if the basic reproduction number R0 〉 1, the disease is uniformly persistent and the unique endemic equilibrium of the system is locally as well as globally asymptotically stable under certain conditions. Finally, the numerical results justify the analytical results.

关键词： SEIVR reproduction number global stability numerical results.

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Global stability and vaccination of an SEIVR epidemic model with saturated incidence rate

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International Journal of Biomathematics 2016年第5期9卷 59-83页

作者： Muhammad Altaf Khan yasir Khan Sehra Khant saeed Islam Department of Mathematics Abdul Wall Khan University Mardan Khyber Pakhtunkhwa 23200 Pakistan Department of Mathematics University of Haft Al-Batin Hafr Al-Batin 31991 Saudi Arabia Department of Mathematics Abdul Wali Khan University Mardan Khyber Pakhtunkhwa 23200 Pakistan

This study considers SEIVR epidemic model with generalized nonlinear saturated inci- dence rate in the host population horizontally to estimate local and global equilibriums. By using the Rout^Hurwitz criteria, it is shown that if the basic reproduction number R0 〈 1, the disease-free equilibrium is locally asymptotically stable. When the basic reproduction number exceeds the unity, then the endemic equilibrium exists and is stable locally asymptotically. The system is globally asymptotically stable about the disease-free equilibrium if R0 〈 1. The geometric approach is used to present the global stability of the endemic equilibrium. For R0〉 1, the endemic equilibrium is stable globally asymptotically. Finally, the numerical results are presented to justify the mathematical results.

关键词： Epidemic model reproduction number vaccination global stability Routh- Hurwitz criteria numerical solution.

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Mathematical modeling approach to the transmission dynamics of pine wilt disease with saturated incidence rate

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International Journal of Biomathematics 2018年第3期11卷 77-96页

作者： Muhammad Altaf Khan Kamil Shaht yasir Khan saeed Islam Department of Mathematics City University of Science and Information Technology Peshawar Khyber Pakhtunkhwa 25000 Pakistan Department of Mathematics University of Haft A1 Batin Hafr Al Batin 31991 Saudi Arabia Department of Mathematics Abdul Wall Khan University Mardan Khyber Pakhtunkhwa 23200 Pakistan

The present paper investigates the dynamics of pine wilt disease with saturated incidence rate. The proposed model is stable both locally and globally. The local stability of the disease-free equilibrium is determined by the basic reproduction R0. The disease-free equilibrium is stable locally and globally whenever R0〈 1. If R0 〉 1, then the endemic state is stable both locally and globally. Further, a brief discussion with conclusion on the numerical results of the proposed model is presented.

关键词： SEIVRS mathematical model pine wilt disease stability analysis numerical simulation.

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Dynamical system of a SEIQV epidemic model with nonlinear generalized incidence rate arising in biology

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International Journal of Biomathematics 2017年第7期10卷 107-125页

作者： Muhammad Altaf Khan yasir Khan Taj Wali Khan saeed Islam Department of Mathematics Abdul Wali Khan University Mardan Khyber Pakhtunkhwa Pakistan Department of Mathematics University of Haft Al-Batin Haft Al-Batin 31991 Saudi Arabia

In this paper, a dynamical system of a SEIQV mathematical model with nonlinear generalized incidence arising in biology is investigated. The stability of the disease-free and endemic equilibrium is discussed. The basic reproduction number of the model is obtained. We found that the disease-free and endemic equilibrium is stable locally as well as globally asymptotically stable. For R0〈1, the disease-free equilibrium is stable both locally and globally and for R0〉1, the endemic equilibrium is stable globally asymptotically. Finally, some numerical results are presented.

关键词： Epidemic model SEIQV model vaccination global stability numerical solution.

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Mechanism of Thermally Radiative Prandtl Nanofluids and Double-Diffusive Convection in Tapered Channel on Peristaltic Flow with Viscous Dissipation and Induced Magnetic Field

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Computer Modeling in Engineering & Sciences 2024年第2期138卷 1501-1520页

作者： yasir Khan Safia Akram Maria Athar Khalid saeed Alia Razia A.Alameer Department of Mathematics University of Hafr Al-BatinHafr Al-Batin31991Saudi Arabia MCS National University of Sciences and TechnologyIslamabadPakistan SEECS National University of Sciences and TechnologyIslamabadPakistan College of Aeronautical Engineering National University of Sciences and TechnologyIslamabadPakistan

The application of mathematical modeling to biological fluids is of utmost importance, as it has diverse applicationsin medicine. The peristaltic mechanism plays a crucial role in understanding numerous biological flows. In thispaper, we present a theoretical investigation of the double diffusion convection in the peristaltic transport of aPrandtl nanofluid through an asymmetric tapered channel under the combined action of thermal radiation andan induced magnetic field. The equations for the current flow scenario are developed, incorporating relevantassumptions, and considering the effect of viscous dissipation. The impact of thermal radiation and doublediffusion on public health is of particular interest. For instance, infrared radiation techniques have been used totreat various skin-related diseases and can also be employed as a measure of thermotherapy for some bones toenhance blood circulation, with radiation increasing blood flow by approximately 80%. To solve the governingequations, we employ a numerical method with the aid of symbolic software such as Mathematica and *** velocity, magnetic force function, pressure rise, temperature, solute (species) concentration, and nanoparticlevolume fraction profiles are analytically derived and graphically displayed. The results outcomes are compared withthe findings of limiting situations for verification.

关键词： Double diffusion convection thermal radiation induced magnetic field peristaltic flow tapered asymmetric channel viscous dissipation Prandtl nanofluid

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Foliar application of micronutrients enhances crop stand, yield and the biofortification essential for human health of different wheat cultivars

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Journal of Integrative Agriculture 2019年第6期18卷 1369-1378页

作者： Muhammad Zahir Aziz Muhammad Yaseen Tanveer Abbas Muhammad Naveed Adnan Mustafa yasir Hamid Qudsia saeed XU Ming-gang Institute of Soil and Environmental Sciences University of AgricultureFaisalabad 38040Pakistan National Engineering Laboratory for Improving Quality of Arable Land Institute of Agricultural Resources and Regional PlanningChinese Academy of Agricultural SciencesBeijing 100081P.R.China College of Environmental and Resources Science Zhejiang UniversityHangzhou 310058P.R.China College of Natural Resources and Environment Northwest Agriculture and Forestry UniversityYangling 712100P.R.China

Globally about half of the world’s population is under micronutrient malnutrition due to poor quality food *** overcome this problem,fortification and biofortification techniques are often *** is considered a better option than fortification due to the easy control of nutrient deficiencies present in daily *** field experiment was conducted to evaluate the effects of foliar application of a micronutrient mixture(MNM)consisting of zinc(Zn),iron(Fe),copper(Cu),manganese(Mn)and boron(B)on yield and flour quality of *** results show the effectiveness of foliar feeding for growth and yield parameters,in addition to the enriching of wheat grains with Zn,Cu,Fe,Mn and *** to the control without foliar feeding,foliar application on wheat crop increased tillering ability,spike length,grain yield and the contents of Zn,Cu,Mn,Fe and B by 21,47,22,22 and 25%in wheat flour,***,foliar feeding of micronutrients could be an effective approach to enrich wheat grains with essential nutrients for correcting malnutrition.

关键词： enrichment biofortification malnutrition micronutrients wheat flour

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Fuzzy Logic Control of a Head-movement Based Semi-autonomous Human–machine Interface

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Journal of Bionic Engineering 2023年第2期20卷 645-655页

作者： yasirÖzlük Eda Akman Aydin Institute of Sciences Selçuk UniversityAlaaddin Keykubad CampusSelçukluKonya42130Turkey Faculty of Technology Electrical and Electronics EngineeringGazi University06500 Teknikokullar BesevlerAnkara06500Turkey

Quadriplegia is a neuromuscular disease that may cause varying degrees of functional loss in trunk and *** such cases,head movements can be used as an alternative communication *** this study,a human–machine interface which is controlled by human head movements is designed and *** proposed system enables users to steer the desired movement direction and to control the speed of an output device by using head *** movements of the users are detected using a 6 DOF IMUs measuring three-axis accelerometer and three-axis *** head movement axes and the Euler angles have been associated with movement direction and speed,*** ensure driving safety,the speed of the system is determined by considering the speed requested by the user and the obstacle distance on the *** this context,fuzzy logic algorithm is employed for closed-loop speed control according to distance sensors and reference speed data.A car model was used as the output device on the machine ***,the wireless communication between human and machine interfaces provides to adapt this system to any remote device or *** implemented system was tested by five *** of the system was evaluated in terms of task completion times and feedback from the subjects about their experience with the *** indicate that the proposed system is easy to use;and the control capability and usage speed increase with user *** control speed is improved with the increase in user experience.

关键词： Human-machine interface(HMI) Head-movement Obstacle avoidance Inertial measurement unit(IMU) Fuzzy logic

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Progress on global hepatitis elimination targets

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World Journal of Gastroenterology 2021年第47期27卷 8199-8200页

作者： yasir Waheed Multidisciplinary Laboratory Foundation University Medical CollegeFoundation University IslamabadIslamabad 44000Pakistan

In 2016,the World Health Assembly adopted a Global Health Sector Strategy on viral hepatitis,with targets set for the years 2020 and 2030 to achieve hepatitis *** main target of hepatitis elimination strategy is to reduce the incidence of hepatitis B virus(HBV)and hepatitis C virus(HCV)by 90%and mortality by 65%in *** last 5 years,the number of people receiving HCV treatment has increased from 1 million to 9.4 million;however,this number is far from the 2030 target of 40 million people receiving HCV *** and HCV incidence rates are down from 1.4 million to 1.1 million annual deaths but this is far from the 2030 target of<0.5 million *** coronavirus disease 2019 pandemic has severely affected the efforts in the fight against *** major donor has committed to investing in the fight against *** is running *** is a need to speed up efforts in the fight against hepatitis to achieve hepatitis elimination by 2030.

关键词： Hepatitis elimination Blood donations Safe injections Hepatitis B vaccination Harm reduction

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Effect of interferon plus ribavirin therapy on hepatitis C virus genotype 3 patients from Pakistan:Treatment response,side effects and future prospective

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Asian Pacific Journal of Tropical Medicine 2015年第2期8卷 85-89页

作者： yasir Waheed Atta ur Rahman School of Applied Biosciences National University of Sciences & Technology(NUST)Islamabad 44000Pakistan

More than 10 million people are suffering from hepatitis C virus(HCV) in Pakistan,The available treatment option is a combination of interferon and *** response is linked with several factors and also induces a number of side *** searched in *** Medi Net and Coogle Scholar for the articles presenting the effect of interferon plus ribavirin therapy on HCV patients from Pakistan,their side effects and future *** major prevalent HCV genotype in Pakistan is *** interferon alpha plus ribavirin showed sustained virological response of 54%-64%while pegylaled interferon alpha plus ribavirin showed sustained virological response of 58%-75%.IL-28 B CC genotype is linked with better sustained virological *** on patients with HCV genotype 3 infections showed no correlation between treatment response and interferon sensitivity determining region *** therapy is linked with a number of side effects like thyroid *** disorders,weight loss,gastrointestinal tract side effects and neuropsychiatric side *** side effects of clubbing of fingers and seizures were also observed in a couple of *** alpha plus ribavirin therapy showed better response rate in HCV genotype 3 patients from Pakistan with number of side effects.A couple of interferon free therapies are light of hope for the patients living with HCV.

关键词： Hepatitis C virus Interferon therapy Genotype 3

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