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On the roads to H1N1 pandemic era:drive safe and fearless using colour-coded masks

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Asian Pacific Journal of Tropical medicine 2012年第4期5卷 333-334页

作者： m shahid Department of microbiology Immunology & Infectious DiseasesCollege of Medicine & Medical SciencesArabian Gulf UniversityKingdom of Bahrain Section of Antimicrobial Resistance Research and molecular Biology Department of MicrobiologyJawaharlal Nehru Medical College & HospitalAligarh Muslim UniversityAligarh-202002Uttar PradeshIndia

Notwithstanding the end of 2009 H1N1 pandemic,the threat for its revisit still persists and WHO has warned to remain *** that lime the situation was more panicky than *** this article,a suggestion to minimize the panic is provided by the usage of colour-coded masks and is proposed hereby as a "population segregation" approach in case of the revisit of HlNl or similar threatening respiratory viral infections.

关键词： H1N1 Respiratory viral infections Colour-coded masks Population segregation Public health

Effect of Co substitution on the structural,electrical,and magnetic properties of Bi_(0.9)La_(0.1)FeO_3 by sol-gel synthesis

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International Journal of minerals,metallurgy and materials 2013年第2期20卷 166-171页

作者： Ghulam Ali Saadat A.Siddiqi shahid m.Ramay shahid Atiq murtaza Saleem Centre of Excellence in Solid State Physics University of the Punjab Interdisciplinary Research Centre in Biomedical materials COMSATS Institute of Information Technology Chemical Engineering Department College of EngineeringKing Saud University

Cobalt （Co）-doped ***3 multiferroics were synthesized by a sol-gel method based on the auto- combustion technique. As-synthesized powder was examined using various characterization techniques to explore the effect of Co substitution on the properties of Bi0.9La0.1FeO3. X-ray diffraction reveals that Co-doped Bi0.9La0.1FeO3 preserves the perovskite-type rhombohedral structure of BiFeO3, and the composition without Co preserves the original structure of the phase; however, a second-phase Bi2Fe409 has been identified in all other compositions. Surface morphological studies were performed by scanning electron microscopy. Temperature-dependent resistivity of the samples reveals the characteristic insulating behavior of the multiferroic material. The resistivity is found to decrease with the increase both in temperature and Co content. Room temperature frequency-dependent dielectric measurements were also reported. magnetic measurements show the enhancement in magnetization with the increase in Co content.

关键词： multiferroics cobalt doping microstructure electric properties magnetic properties sol-gel process

Enhancing secrecy rates in a wiretap channel

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Digital Communications and Networks 2020年第1期6卷 129-135页

作者： shahid m.Shah Vinod Sharma Department of ECE Indian Institute of ScienceBangalore560012India

Reliable communication imposes an upper limit on the achievable rate,namely the Shannon ***'s wiretap coding ensures a security constraint and reliability,but results in a decrease of achievable *** mitigate the loss in secrecy rate,we propose a coding scheme in which we use sufficiently old messages as key and prove that multiple messages are secure with respect to all the information possessed by the *** also show that we can achieve security in the strong ***,we study a fading wiretap channel with full channel state information of the eavesdropper's channel and use our coding/decoding scheme to achieve a secrecy capacity close to the Shannon capacity of the main channel(in the ergodic sense).Finally,we study a case where the transmitter does not have instantaneous information of the channel state of the eavesdropper,but only its distribution.

关键词： Physical layer security Rate loss Secret key Wiretap channel Secrecy capacity

Origin of Ferromagnetism in Al and Ni Co-doped ZnO Based DmS materials

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Chinese Physics Letters 2012年第10期29卷 155-157页

作者： murtaza Saleem Saadat A.Siddiqi shahid m.Ramay shahid Atiq Shahzad Naseem Centre for Solid State Physics University of the PunjabQuaid-e-Azam CampusLahore 54590Pakistan 2Interdisciplinary Research Centre in Biomedical MaterialsCOMSATS Institute of Information TechnologyDefence RoadOff Raiwind RoadLahorePakistan 3Department of Chemical EngineeringCollege of EngineeringKing Saud UniversityP.O.Box 800Riyadh 11421Saudi Arabia

Zn0.95Ni0.05O and Zn0.90Ni0.05Al0.05O compositions of nanocrystallites are synthesised using the well recognised auto-combustion *** x-ray diffraction patterns demonstrate the phase pure characteristic wurtzite-type crystal structure with space group P63mc in both the *** elemental incorporation of Ni and Al contents into the ZnO structure is confirmed by energy dispersive x-ray *** micrographs of scanning electron microscopy show an approximate ordered *** electrical resistivity is observed to decrease with the rising temperature,depicting the characteristic semiconductor behaviour of the *** lower values of resistivity and ferromagnetic interactions in the Al-doped sample correspond to an increase of carrier's *** is observed that the carrier mediated mechanism is mainly responsible for ferromagnetism in ZnO-based diluted magnetic semiconductors.

关键词： resistivity diluted Origin

Land use/land cover classification and its change detection using multi-temporal mODIS NDVI data

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Journal of Geographical Sciences 2015年第12期25卷 1479-1506页

作者： m USmAN R LIEDLI m A shahid A ABBAS Institute for Groundwater management TU Dresden 01069 Dresden Germany University of Agriculture Faisalabad Pakistan Leibniz Centre for Agricultural Landscape Research (ZALF) Eberswalder Str. 84 15374 Mencheberg Germany

Detailed analysis of Land Use/Land Cover （LULC） using remote sensing data in complex irrigated basins provides complete profile for better water resource management and planning. Using remote sensing data, this study provides detailed land use maps of the Lower Chenab Canal irrigated region of Pakistan from 2005 to 2012 for LULC change detection. major crop types are demarcated by identifying temporal profiles of NDVI using mODIS 250 m × 250 m spatial resolution data. Wheat and rice are found to be major crops in rabi and kharif seasons, respectively. Accuracy assessment of prepared maps is performed using three dif- ferent techniques： error matrix approach, comparison with ancillary data and with previous study. Producer and user accuracies for each class are calculated along with kappa coeffi- cients （K）. The average overall accuracies for rabi and kharif are 82.83% and 78.21%, re- spectively. Producer and user accuracies for individual class range respectively between 72.5% to 77% and 70.1% to 84.3% for rabi and 76.6% to 90.2% and 72% to 84.7% for kharif. The K values range between 0.66 to 0.77 for rabi with average of 0.73, and from 0.69 to 0.74 with average of 0.71 for kharif. LULC change detection indicates that wheat and rice have less volatility of change in comparison with both rabi and kharif fodders. Transformation be- tween cotton and rice is less common due to their completely different cropping conditions. Results of spatial and temporal LULC distributions and their seasonal variations provide useful insights for establishing realistic LULC scenarios for hydrological studies.

关键词： land use/land cover remote sensing normalized difference vegetation index accuracy assessment change detection hydrological modeling

Theoretical investigation of optical properties and band gap engineering for Zn1-xTmxTe(Tm=Fe,Co)alloys by modified Becke-Johnson potential

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Chinese Physics B 2017年第8期26卷 491-498页

作者： Q mahmood m Yaseen m Hassan shahid m Ramay Asif mahmood materials Growth and Simulation Laboratory Department of PhysicsUniversity of the PunjabQuaid-i-Azam Campus54590LahorePakistan Department Of Physlcs University of Agriculture UniversityFaisalabad 38040Pakistan Physics and Astronomy Department College of ScienceKing Sand UniversityRiyadhSaudi Arabia Chemical Engineering Department College of EngineeringKing Saud UniversityRiyadhSaudi Arabia

The direct band gap ZnTe with transition metal （Tm） impurities plays a vital role in optoelectronic and spintronic applications. In the present study, we use the advanced modified Becke-Johnson （mBJ） functional for performing the structural computations and detailed investigations of the optical characters in Zn1_xTmxTe （Tm = Fe, Co） alloys with 0 ≤ x ≤1. By employing the FP-LAPW method, we determine various optical parameters for the ternary alloys and for the end binaries. The calculated static dielectric constants and optical band gaps for Zn1_xTmxTe （Tm = Fe, Co） have an inverse relation that verifies the Penn model. We find that the static dielectric constant is nearly equal to the square of the static refractive index, and both increase with Tm content. Furthermore, we also find a slight shift of peaks to a higher energy region with increasing Tm concentration. The decreasing band gap and high value of the absorption in the visible region of electromagnetic spectrum make these alloys suitable for photonic and solar cell applications.

关键词： amorphous semiconductors transition metal-doped ZnTe structural computation optical property

Experimental Study on Heat Storage Properties Comparison of Paraffin/metal Foams Phase Change material Composites

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Journal of Thermal Science 2024年第2期33卷 469-478页

作者： Waqar AHmED Abid HUSSAIN Hanzla shahid Imran ALI Hafiz muhammad ALI Department of mechanical Engineering University of Engineering and TechnologyTaxila47080Pakistan Department of mechanical Engineering Institute of Space TechnologyIslamabadPakistan Department of mechanical Mechatronics and Manufacturing EngineeringUniversity of Engineering and Technology LahoreFaisalabad CampusPunjabPakistan mechanical Engineering Department King Fahd University of Petroleum and MineralsDhahran31261Saudi Arabia Interdisciplinary Research Center for Renewable Energy and Power Systems(IRC-REPS) King Fahd University of Petroleum and MineralsDhahran31261Saudi Arabia

Heat storage properties of phase change materials(PCms) are essential characteristics that perform a key role in thermal heat energy storage *** thermal properties of PCms can be improved by developing metal foam/PCm *** addition of metal foam in PCms has a significant effect on the thermal characteristics of *** this paper,the heat storage properties of two different metal foam/PCm composites were experimentally *** behavior of paraffin in metal foam(copper and iron-nickel)/paraffin composites concerning pure paraffin at a constant heat flux of 1000 W/m^(2) in three directions simultaneously(x,y,and z) was *** was infiltrated into copper and iron-nickel foams to develop composite materials which resulted in enhancing the thermal conductivity of the paraffin.A comparative analysis is made on the heat storage properties of paraffin in copper and iron-nickel foams/paraffin *** temperature distribution during the phase transition process is experimentally *** comparison indicates that temperature uniformity in copper foam/paraffin composite is better than in iron-nickel foam/paraffin composite and pure paraffin at the same heat *** results show that at heat flux of 1000 W/m^(2),the heat storage time for copper foam/paraffin composite is 20.63% of that of iron-nickel foam/paraffin composite.

关键词： heat storage capacity paraffin/metal foam composite temperature uniformity heat storage rate phase transition process

Structural performance of flexible freeform panelssubjected to wind loads

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Frontiers of Structural and Civil Engineering 2024年第6期18卷 851-869页

作者： Yong YOO Zaryab shahid Renzhe CHEN maria KOLIOU Anastasia mULIANA Negar KALANTAR Zachry Department of Civil and Environmental Engineering Texas A&M UniversityCollege StationTX 77843USA J.mike Walker'66 Department of mechanical Engineering Texas A&M UniversityCollege StationTX 77843USA Architecture Division California College of the ArtsSan FranciscoCA 94107USA

An increased number of hurricanes and tornadoes have been recorded worldwide in the last decade,while research efforts to reduce wind-related damage to structures become *** architecture,which focuses on generating complex curved shapes including streamlined shapes,has recently gained *** study focuses on investigating the potential of kerf panels,which have unique flexibility depending on the cut patterns and densities,to generate complex shapes for facades and their performance under wind *** investigate the kerf panel's potential capacity against wind loads,static and dynamic analyses were conducted for two kerf panel types with different cut densities and pre-deformed *** was observed that although solid panels result in smaller displacement amplitudes,stresses,and strains in some cases,the kerf panels allow for global and local cell deformations resulting in stress reduction in various locations with the potential to reduce damage due to overstress in *** the predeformed kerf panels,it was observed that both the overall stress and strain responses in kerf cut arrangements were lower than those of the flat-shaped *** study shows the promise of the use of kerf panels in achieving both design flexibility and performance demands when exposed to service *** that this newly proposed architectural configuration(design paradigm)for facades could revolutionize structural engineering by pushing complex freeform shapes to a standard practice that intertwines aesthetic arguments,building performance requirements,and material design considerations has the potential for significant practical applications.

关键词： freeform structure kerfing method wind load analysis cladding component

Enhancing mild Cognitive Impairment Detection through Efficient magnetic Resonance Image Analysis

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Computers, materials & Continua 2024年第8期80卷 2081-2098页

作者： Atif mehmood Zhonglong Zheng Rizwan Khan Ahmad Al Smadi Farah shahid shahid Iqbal mutasem K.Alsmadi Yazeed Yasin Ghadi Syed Aziz Shah mostafa m.Ibrahim Department of Computer Science and Technology Zhejiang Normal UniversityJinhua321002China Zhejiang Institute of Photoelectronics&Zhejiang Institute for Advanced Light Source Zhejiang Normal UniversityJinhua321004China Department of Data Science and Artificial Intelligence Zarqa UniversityZarqa13100Jordan School of Chemical and Environmental Engineering College of ChemistryChemical Engineering andMaterials ScienceSoochow UniversitySuzhou215123China Department of management Information Systems College of Applied Studies and Community ServiceImam Abdulrahman Bin Faisal UniversityDammam32244Saudi Arabia Department of Computer Science Al Ain UniversityAbu Dhabi999041United Arab Emirates Department of Electrical Engineering Faculty of EngineeringMinia UniversityMinia61519Egypt Healthcare Technology and Innovation Theme Faculty Research Centre for Intelligent HealthcareCoventry UniversityCoventryCV48BWUK

Neuroimaging has emerged over the last few decades as a crucial tool in diagnosing Alzheimer’s disease(AD).mild cognitive impairment(mCI)is a condition that falls between the spectrum of normal cognitive function and ***,previous studies have mainly used handcrafted features to classify mCI,AD,and normal control(NC)*** paper focuses on using gray matter(Gm)scans obtained through magnetic resonance imaging(mRI)for the diagnosis of individuals with mCI,AD,and *** improve classification performance,we developed two transfer learning strategies with data augmentation(i.e.,shear range,rotation,zoom range,channel shift).The first approach is a deep Siamese network(DSN),and the second approach involves using a cross-domain strategy with customized *** performed experiments on the Alzheimer’s Disease Neuroimaging Initiative(ADNI)dataset to evaluate the performance of our proposed *** experimental results demonstrate superior performance in classifying the three binary classification tasks:NC ***,NC ***,and mCI ***,we achieved a classification accuracy of 97.68%,94.25%,and 92.18%for the three cases,*** study proposes two transfer learning strategies with data augmentation to accurately diagnose mCI,AD,and normal control individuals using Gm *** findings provide promising results for future research and clinical applications in the early detection and diagnosis of AD.

关键词： Alzheimer’s disease mild cognitive impairment normal control transfer learning classification augmentation