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Numerical Analysis of Novel Coronavirus (2019-nCov) Pandemic Model with Advection

Computers, Materials & Continua 2021年第6期67卷 2933-2953页

作者： Shumaila Azam Nauman Ahmed Ali Raza Muhammad sajid Iqbal Muhammad Rafiq Ilyas Khan Kottakkaran Sooppy Nisar Muhammad Ozair Ahmad Zafar Iqbal Department of Mathematics and Statistics The University of LahoreLahorePakistan Department of Mathematics National College of Business Administration and Economics LahorePakistan Faculty of Engineering University of Central Punjab Lahore Pakistan Faculty of Mathematics and Statistics Ton Duc Thang UniversityHo Chi Minh City72915Vietnam Department of Mathematics College of Arts and Science at Wadi AldawaserPrince Sattam Bin Abdulaziz University11991AlkharjKingdom of Saudi Arabia Department of Mathematics University of Management and TechnologyLahorePakistan

Recently,the world is facing the terror of the novel corona-virus,termed as *** health institutes and researchers are continuously striving to control this *** this article,the SEIAR(susceptible,exposed,infected,symptomatically infected,asymptomatically infected and recovered)infection model of COVID-19 with a constant rate of advection is studied for the disease propagation.A simple model of the disease is extended to an advection model by accommodating the advection process and some appropriate parameters in the *** continuous model is transposed into a discrete numerical model by discretizing the domains,*** analyze the disease dynamics,a structure preserving non-standard finite difference scheme is *** steady states of the continuous system are described i.e.,virus free steady state and virus existing steady *** results show that both the steady states of the numerical design coincide with the fixed points of the continuous SEIAR *** of the state variables is ensured by applying the M-matrix theory.A result for the positivity property is *** the proposed numerical design,two different types of the stability are *** stability and linear stability for the projected scheme is examined by applying some standard *** Neuman stability test is applied to ensure linear *** reproductive number is described and its pivotal role in stability analysis is also *** and convergence of the numerical model is also *** graphs are presented via computer simulations to prove the worth and efficiency of the quarantine factor is explored graphically,which is helpful in controlling the disease *** the end,the conclusion of the study is also rendered.

关键词： 2019-nCov infectious model with advection reproductive number stability analysis numerical graphs

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Specimen retrieval approaches in patients undergoing laparoscopic colorectal resections:a literature-based review of published studies

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Gastroenterology Report 2014年第4期2卷 251-261页

作者： Muhammad S.sajid Muhammad I.Bhatti Parv Sains Mirza K.Baig Department of General&Laparoscopic Colorectal Surgery Worthing HospitalWorthingUK Department of General Surgery Queen Elizabeth HospitalKings Lynn NHS Foundation TrustKings LynnUK

Objective:To review the published studies reporting various specimen retrieval incisions being used by colorectal surgeons in patients undergoing laparoscopic colorectal resections(LCR).Methods:Standard medical electronic databases were searched to find relevant articles and a summary conclusion was ***:There were 43 studies reporting various approaches used for the purpose of specimen retrieval in 2388 patients undergoing *** most common approaches were periumbilical midline incision(1260 reported case in the literature),transverse incision(583 reported cases in the literature)in the right-or left iliac fossa,depending on the side of colonic resection,and Pfannensteil incision(293 reported cases in the literature).Periumbilical midline incision was associated with the higher risk of developing incisional hernia(odds ratio 53.72;95%confidence interval 7.48–386.04;Z=3.96;P=0.0001).In terms of surgical site infection(SSI),there was no difference between the three common approaches to specimen *** and transvaginal approaches were associated with higher risk of ***:Midline,transverse and Pfannensteil incisions were the most commonly used approaches for specimen retrieval following *** incision was associated with higher risk of incisional *** of SSI was similar in all three common *** transanal and transvaginal approaches pose a higher risk of *** conclusions are based on the combined outcome of published case series,case reports and comparative ***,controlled trials with longer follow-up are required before recommending the routine use of any approach for specimen retrieval in patients undergoing LCR.

关键词： colorectal cancer laparoscopic colorectal surgery umbilical incision transverse incision anal retrieval vaginal retrieval

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Electrochemical CO_(2) reduction to C_(2+) products using Cu-based electrocatalysts:A review

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Nano Research Energy 2022年第2期1卷 140-181页

作者： Touqeer Ahmad Shuang Liu Muhammad sajid Ke Li Mohsin Ali Liang Liu Wei Chen Department of Applied Chemistry School of Chemistry and Materials ScienceHefei National Research Center for Physical Sciences at the MicroscaleUniversity of Science and Technology of ChinaHefei 230026China Department of Ophthalmology School of MedicineStanford UniversityPalo AltoCA 94304USA

With the disruptive carbon cycle being blamed for global warming,the plausible electrocatalytic CO_(2)reduction reaction(CO_(2)RR)to form valuable C_(2+)hydrocarbons and feedstock is becoming a hot ***-based electrocatalysts have been proven to be excellent CO_(2)RR alternatives for high energy value-added products in this ***,the selectivity of CO_(2)RR to form C_(2+)products via Cu-based catalysts suffers from a high overpotential,slow reaction kinetics,and low *** review attempts to discuss various cutting-edge strategies for understanding catalytic design such as Cu-based catalyst surface engineering,tuning Cu bandgap via alloying,nanocatalysis,and the effect of the electrolyte and pH on catalyst *** most recent advances in in situ spectroscopy and computational techniques are summarized to fully comprehend reaction mechanisms,structural transformation/degradation mechanisms,and crystal facet loss with subsequent effects on catalyst ***,approaches for tuning Cu interactions are discussed from four key perspectives:single-atom catalysts,interfacial engineering,metal-organic frameworks,and polymer-incorporated materials,which provide new insights into the selectivity of C_(2+)***,major challenges are outlined,and potential prospects for the rational design of catalysts for robust CO_(2)RR are *** integration of catalytic design with mechanistic understanding is a step forward in the promising advancement of CO_(2)RR technology for industrial applications.

关键词： electrocatalysis CO_(2)reduction C_(2+)hydrocarbon Cu materials nanostructures

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Fluorine-defects induced solid-state red emission of carbon dots with an excellent thermosensitivity

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Chinese Chemical Letters 2021年第11期32卷 3646-3651页

作者： Haizhen Ding Jiahui Xu Lei Jiang Chen Dong Qi Meng sajid ur Rehman Junfeng Wang Zhishen Ge Vladimir Yu.Osipov Hong Bi School of Chemistry and Chemical Engineering Anhui Key Laboratory of Modern BiomanufacturingAnhui UniversityHefei 230601China High Magnetic Field Laboratory Hefei Institutes of Physical ScienceChinese Academy of SciencesHefei 230031China CAS Key Laboratory of Soft Matter Chemistry Department of Polymer Science and EngineeringUniversity of Science and Technology of ChinaHefei 230601China Ioffe Institute Russian Academy of SciencesSt.Petersburg 194021Russian Federation

Up to date,solid-state carbon dots(CDs)with bright red fluorescence have scarcely achieved due to aggregation-caused quenching(ACQ)effect and extremely low quantum yield in deep-red to near infrared ***,we report a novel fluorine-defects induced solid-state red fluorescence(λ_(em)=676 nm,the absolute fluorescence quantum yields is 4.17%)in fluorine,nitrogen and sulfur co-doped CDs(F,N,S-CDs),which is the first report of such a long wavelength emission of solid-state *** a control,CDs without fluorine-doping(N,S-CDs)show no fluorescence in solid-state,and the fluorescence quantum yield/emission wavelength of N,S-CDs in solution-state are also lower/shorter than that of F,N,S-CDs,which is mainly due to the F-induced defect traps on the surface/edge of F,N,***,the solid-state F,N,S-CDs exhibit an interesting temperature-sensitive behavior in the range of 80-420 K,with the maximum fluorescence intensity at 120 K,unveiling its potential as the temperature-dependent fluorescent sensor and the solid-state light-emitting device adapted to multiple temperatures.

关键词： Carbon dots Fluorine defects Solid-state fluorescence Thermosensitivity Red emission

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Adult neurogenesis:a real hope or a delusion?

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Neural Regeneration Research 2024年第1期19卷 6-15页

作者： Ghulam Hussain Rabia Akram Haseeb Anwar Faiqa sajid Tehreem Iman Hyung Soo Han Chand Raza Jose-Luis Gonzalez De Aguilar Neurochemicalbiology and Genetics Laboratory(NGL) Department of PhysiologyFaculty of Life SciencesGovernment College UniversityFaisalabadPunjabPakistan Department of Physiology School of MedicineClinical Omics InstituteKyungpook National UniversityDaeguKorea Department of Zoology Faculty of Chemistry and Life SciencesGovernment College UniversityLahorePakistan INSERM U1118Mécanismes Centraux et Péripheriques de la NeurodégénérescenceStrasbourgFranceUniversitéde StrasbourgStrasbourgFrance

Adult neurogenesis,the process of creating new neurons,involves the coordinated division,migration,and differentiation of neural stem *** process is restricted to neurogenic niches located in two distinct areas of the brain:the subgranular zone of the dentate gyrus of the hippocampus and the subventricular zone of the lateral ventricle,where new neurons are generated and then migrate to the olfactory *** has been thought to occur only during the embryonic and early postnatal stages and to decline with age due to a continuous depletion of neural stem ***,recent years have seen tremendous progress in our understanding of adult brain neurogenesis,bridging the knowledge gap between embryonic and adult ***,we discuss the current status of adult brain neurogenesis in light of what we know about neural stem *** this notion,we talk about the importance of intra cellular signaling molecules in mobilizing endogenous neural stem cell prolife *** on the current understanding,we can declare that these molecules play a role in targeting neurogenesis in the mature ***,to achieve this goal,we need to avoid the undesired proliferation of neural stem cells by controlling the necessary checkpoints,which can lead to tumorigenesis and prove to be a curse instead of a blessing or hope.

关键词： adult neurogenesis aging brain-derived neurotrophic factor dentate gyrus hippocampus neural stem cells neurotrophic factors Notch oxidative stress stem cells subgranular zone

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Overview of Strain Characterization in Relation to Serological and Molecular Detection of Citrus tristeza Closterovirus

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Phyton-International Journal of Experimental Botany 2021年第4期90卷 1063-1074页

作者： Yasir Iftikhar Mazhar Abbas Mustansar Mubeen Muhammad Zafar-ul-Hye Faheema Bakhtawar Sonum Bashir Ashara sajid Muhammad Asif Shabbir Department of Plant Pathology College of AgricultureUniversity of SargodhaSargodha40100Pakistan Institute of Horticultural Sciences University of Agriculture FaisalabadFaisalabad38000Pakistan State Key Laboratory of Agricultural Microbiology and Provincial Key Laboratory of Plant Pathology of Hubei Province College of Plant Science and TechnologyHuazhong Agricultural UniversityWuhan430070China Department of Soil Science Faculty of Agricultural Sciences and TechnologyBahauddin Zakariya UniversityMultan60800Pakistan

Tristeza is a devastating viral disease in all the citrus growing countries throughout the world and has killed millions of citrus trees in severely affected *** citrus species grafted on sour orange rootstock are affected by this ***,the sweet orange,grapefruit and lime trees grafted on sour orange exhibit severe symptoms like quick decline,vein clearing,pin holing,bark scaling and degeneration leading to variable *** expression of Citrus tristeza virus(CTV)in different hosts has been attributed to virus isolates which are from severe to *** serological and molecular assays have been deployed to differentiate the strains of *** tristeza virus is diversified towards its strains on the basis of biological,serological and molecular *** expression is due to genetic alteration and different molecular basis have now been adopted for strain *** review will give a brief idea about the different CTV isolates,their characterization based on nucleic acid and serological *** methods along with salient features for strain characterization has also been *** review will also open the new aspects towards formulation of management strategies through different detection techniques.

关键词： Citrus tristeza virus symptomology detection serology isolates and host rang

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Modeling and Simulation of Heterojunction Solar Cell with Mono Crystalline Silicon

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Journal of Applied Mathematics and Physics 2024年第3期12卷 997-1020页

作者： sajid Ullah Ayesha Gulnaz Guangwei Wang School of Electronic Engineering Tianjin University of Technology and Education Tianjin China Department of Physics Rihah International University Islamabad Pakistan

The monocrystalline silicon is a promising material that could be used in solar cells that convert light into electricity. Although the cost of ordinary silicon (Si) solar cells has decreased significantly over the past two decades, the conversion efficiency of these cells has remained relatively high. While solar cells have a great potential as a device of renewable energy, the high cost they incur per Watt continues to be a significant barrier to their widespread implementation. As a consequence, it is vital to conduct research into alternate materials that may be used in the construction of solar cells. The heterojunction solar cell (HJSC), which is based on n-type zinc oxide (n-ZnO) and p-type silicon (p-Si), is one of the numerous alternatives of the typical Si single homojunction solar cell. There are many deficiencies that can be found in the published research on n-ZnO/p-Si heterojunction solar cell. Inconsistencies in the stated value of open circuit voltage (Voc) of the solar cell are one example of deficiency. The absence of a full theoretical study to evaluate the potential of the solar cell structure is another deficiency that can be found in these researches. A lower value of experimentally obtained VOC in comparison to the theoretical prediction based on the band-gap between n-ZnO and p-Si. There needs to be more consensus among scientists regarding the optimal conditions for the growth of zinc oxide. Many software’s are available for simulating and optimizing the solar cells based on these parameters. For this purpose, in this dissertation, I provide computational results relevant to n-ZnO/p-Si HJSC to overcome deficiencies that have been identified. While modeling and simulating the potential of the solar cell structure with AFORS-HET, it is essential to consider the constraints that exist in the real world. AFORS-HET was explicitly designed to mimic the multilayer solar cell arrangement. In AFORS-HET, we can add up to seven la

关键词： Heterojunction Solar Cell Silicon Monocrystalline Deficiencies AFORS-HET Optimization Open Circuit Voltage Quantum Efficiency

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Cambrian integrative stratigraphy,biotas,and paleogeographical evolution of the Qinghai-Tibetan Plateau and its surrounding areas

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Science China Earth Sciences 2024年第4期67卷 950-970页

作者： Zhixin SUN Lang SUN Fangchen ZHAO Bing PAN Malik Muhammad Saud sajid KHAN Shehryar AHMED Chuan YANG Lanyun MIAO Zongjun YIN Guoxiang LI Maoyan ZHU State Key Laboratory of Palaeobiology and Stratigraphy Nanjing Institute of Geology and PalaeontologyChinese Academy of SciencesNanjing 210008China College of Earth and Planetary Sciences University of Chinese Academy of SciencesBeijing 100049China

The Qinghai-Tibetan Plateau and its surrounding areas have a long and complex tectonic evolutionary *** and blocks,such as northern India,Lhasa,Qiangtang,Qaidam and Central Qilian,and their in-between orogenic belts constitute the main part of the Qinghai-Tibetan *** the Cambrian Period,most of these cratons and blocks were on the northwestern periphery of Gondwana,and were associated with the surrounding blocks,***,Central Iran,Afghanistan,Tarim,Alxa,North China,South China and Sibumasu through the Proto-Tethys *** Cambrian stratigraphic sequences on these stable blocks are composed of mixed siliciclastic and carbonate rocks deposited in the shallow-water marine environments,and contain the trilobite assemblages of shelf *** Cambrian stratigraphic sequences in the Qilian tectonic belts,however,are characterized by the intermediate-basic igneous rocks and silicates formed in the Proto-Tethys Ocean,and contain the trilobite assemblages of deep-water slope *** with previous data,field observations and newly discovered fossils through funding by the Second Tibetan Plateau Scientific Expedition and Research,the general characteristics of the Cambrian strata in different tectonic units of the Qinghai-Tibetan Plateau and its surrounding areas have been summarized in this ***,efforts have been made to subdivide and correlate the Cambrian strata across these areas by utilizing available biostratigraphic and geochronological *** a result,a comprehensive litho-and biostratigraphy chart has been ***,from the biogeographic perspective,this paper also provides a brief overview of the Cambrian paleogeographical reconstruction of the major tectonic blocks,and discusses the problems associated with the evolution of the ProtoTethys tectonic belt.

关键词： Qinghai-Tibetan Plateau Cambrian Stratigraphy Paleogeography Biota Gondwana Proto-Tethys Ocean

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Numerical Analysis for the Effect of Irresponsible Immigrants on HIV/AIDS Dynamics

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Intelligent Automation & Soft Computing 2023年第5期36卷 1479-1496页

作者： Muhammad Tariq Ali Dumitru Baleanu Muhammad Rafiq Jan Awrejcewicz Nauman Ahmed Ali Raza Muhammad sajid Iqbal Muhammad Ozair Ahmad Department of Mathematics Barani Institute of SciencesBurewalaPakistan Department of Mathematics Cankaya UniversityBalgatAnkara06530Turkey Department of Medical Research China Medical UniversityTaichung40402Taiwan Institute of Space Sciences Magurele-Bucharest077125Romania Department of Mathematics Faculty of SciencesUniversity of Central PunjabLahore54000Pakistan Department of Automation Biomechanics and MechatronicsLodz University of Technology1/15 Stefanowskiego St.90-924 LodzPoland Department of Mathematics and Statistics University of LahoreLahore54590Pakistan Department of Mathematics Govt.Maulana Zafar Ali Khan Graduate College WazirabadPunjab Higher Education Department(PHED)Lahore54000Pakistan H&BS MCSNational University of Science and Technology(NUST)H-12IslamabadHumayun RoadRawalpindi46000Pakistan

The human immunodeﬁciency viruses are two species of Lentivirus that infect *** time,they cause acquired immunodeﬁciency syndrome,a condition in which progressive immune system failure allows life-threatening opportunistic infections and cancers to *** immunodeﬁciency virus infection came from a type of chimpanzee in Central *** show that immunodeﬁciency viruses may have jumped from chimpanzees to humans as far back as the late *** decades,human immunodeﬁciency viruses slowly spread across Africa and later into other parts of the *** Susceptible-Infected-Recovered(SIR)models are signiﬁcant in studying disease *** this paper,we have studied the effect of irresponsible immigrants on HIV/AIDS dynamics by formulating and considering different ***,Runge Kutta,and a Non-standardﬁnite difference(NSFD)method are developed for the same *** experiments are performed at disease-free and endemic equilibria points at different time step sizes‘ℎ’.The results reveal that,unlike Euler and Runge Kutta,which fail for large time step sizes,the proposed Non-standardﬁnite difference(NSFD)method gives a convergence solution for any time step *** proposed numerical method is bounded,dynamically con-sistent,and preserves the positivity of the continuous solution,which are essential requirements when modeling a prevalent disease.

关键词： SIR model existence analysis numerical methods stability analysis

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Missing Data Imputations for Upper Air Temperature at 24 Standard Pressure Levels over Pakistan Collected from Aqua Satellite

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Journal of Data Analysis and Information Processing 2016年第3期4卷 132-146页

作者： Muhammad Usman Saleem sajid Rashid Ahmed Institute of Geology University of the Punjab Lahore Pakistan Collage of Earth and Environmental Sciences University of the Punjab Lahore Pakistan Center for Geographic Information System Punjab University Collage of Information Technology Lahore Pakistan

This research was an effort to select best imputation method for missing upper air temperature data over 24 standard pressure levels. We have implemented four imputation techniques like inverse distance weighting, Bilinear, Natural and Nearest interpolation for missing data imputations. Performance indicators for these techniques were the root mean square error (RMSE), absolute mean error (AME), correlation coefficient and coefficient of determination ( R2 ) adopted in this research. We randomly make 30% of total samples (total samples was 324) predictable from 70% remaining data. Although four interpolation methods seem good (producing 0.99) found between actual and predicted air temperature data through this method. The high value of the coefficient of determination (0.99) through bilinear interpolation method, tells us best fit to the surface. We have also found similar results for imputation with natural interpolation method in this research, but after investigating scatter plots over each month, imputations with this method seem to little obtuse in certain months than bilinear method.

关键词： Missing Data Imputations Spatial Interpolation AQUA Satellite Upper Level Air Temperature AIRX3STML

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