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Optimized Weighted Ensemble Using Dipper Throated Optimization Algorithm in Metamaterial Antenna

Computers, Materials & Continua 2022年第12期73卷 5771-5788页

作者： Doaa Sami Khafaga El-Sayed M.El-kenawy Faten Khalid Karim sameer Alshetewi Abdelhameed Ibrahim Abdelaziz AAbdelhamid Department of Computer Sciences College of Computer and Information SciencesPrincess Nourah bint Abdulrahman UniversityP.O.Box 84428Riyadh11671Saudi Arabia Department of Communications and Electronics Delta Higher Institute of Engineering and TechnologyMansoura35111Egypt Faculty of Artificial Intelligence Delta University for Science and TechnologyMansoura35712Egypt General Information Technology Department Ministry of DefenseThe Executive AffairsExcellence Services DirectorateRiyadh11564Saudi Arabia Computer Engineering and Control Systems Department Faculty of EngineeringMansoura UniversityMansoura35516Egypt Department of Computer Science Faculty of Computer and Information SciencesAin Shams UniversityCairo11566Egypt Department of Computer Science College of Computing and Information TechnologyShaqra University11961Saudi Arabia

Metamaterial Antennas are a type of antenna that uses metamaterial to enhance *** bandwidth restriction associated with small antennas can be solved using metamaterial *** learning is gaining popularity as a way to improve solutions in a range of *** learning approaches are currently a big part of current research,and they’re likely to be huge in the *** model utilized determines the accuracy of the prediction in large *** goal of this paper is to develop an optimized ensemble model for forecasting the metamaterial antenna’s bandwidth and *** basic models employed in the developed ensemble are Support Vector Regression(SVR),K-NearestRegression(KNR),Multi-Layer Perceptron(MLP),Decision Trees(DT),and Random Forest(RF).The percentages of contribution of these models in the ensemble model are weighted and optimized using the dipper throated optimization(DTO)*** choose the best features from the dataset,the binary(bDTO)algorithm is *** proposed ensemble model is compared to the base models and results are recorded and analyzed *** addition,two other ensembles are incorporated in the conducted experiments for *** ensembles are average ensemble and K-nearest neighbors(KNN)-based *** comparison is performed in terms of eleven evaluation *** evaluation results confirmed the superiority of the proposed model when compared with the basic models and the other ensemble models.

关键词： Metamaterial antenna dipper throated optimization feature selection parameters prediction

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Extraocular retinoblastoma in Indian children:clinical,imaging and histopathological features

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International Journal of Ophthalmology(English edition) 2013年第4期6卷 481-486页

作者： Sumita Sethi Neelam Pushker Seema Kashyap Sanjay Sharma Mridula Mehta sameer Bakhshi Saurbhi Khurana Supriyo Ghose Oculoplasty and Pediatric Ophthalmology Services Dr.Rajendra Prasad Centre for Ophthalmic SciencesAll India Institute of Medical Sciences Department of Ocular Pathology Dr.Rajendra Prasad Centre for Ophthalmic SciencesAll India Institute of Medical Sciences Department of Radiodiagnosis All India Institute of Medical Sciences Department of Medical Oncology Dr.B.R.Ambedkar Institute Rotary Cancer HospitalAll India Institute of Medical Sciences

AIMTo study eyes with extraocular dissemination (EORB), with the following aims: first to establish the mean lag period and to understand various reasons for delayed presentation, second to study their imaging profile... 详细信息

关键词： extraocular retinoblastoma imaging histopathological features

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Free fatty acids receptors 2 and 3 control cell proliferation by regulating cellular glucose uptake

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World Journal of Gastrointestinal Oncology 2020年第5期12卷 514-525页

作者： Saeed Al Mahri Amal Al Ghamdi Maaged Akiel Monira Al Aujan sameer Mohammad Mohammad Azhar Aziz King Abdullah International Medical Research Center Riyadh 11426Saudi Arabia King Saud bin Abdulaziz University for Health Sciences Riyadh 11426Saudi Arabia Ministry of the National Guard-Health Affairs Riyadh 11426Saudi Arabia Department of Experimental Medicine King Abdullah International Medical Research CenterRiyadh 11426Saudi Arabia Colorectal Cancer Research Program King Abdullah International Medical Research CenterRiyadh 11426Saudi Arabia Department of Clinical Laboratory Sciences College of Applied Medical SciencesKing Saud bin Abdulaziz University for Health SciencesRiyadh 11426Saudi Arabia Department of Medical Genomics King Abdullah International Medical Research CenterRiyadh 11426Saudi Arabia Department of Human and Molecular Genetics Virginia Commonwealth UniversityRichmondVA 23284United States

BACKGROUND Colorectal cancer(CRC)is a worldwide problem,which has been associated with changes in diet and lifestyle *** a result of colonic fermentation of dietary fibres,short chain free fatty acids are generated which activate free fatty acid receptors(FFAR)2 and ***2 and FFAR3 genes are abundantly expressed in colonic epithelium and play an important role in the metabolic homeostasis of colonic epithelial *** studies point to the involvement of FFAR2 in colorectal *** To understand the role of short chain FFARs in *** Transcriptome analysis console software was used to analyse microarray data from CRC patients and cell *** employed short-hairpin RNA mediated down regulation of FFAR2 and FFAR3 genes,which was validated using quantitative real time polymerase chain *** for glucose uptake and cyclic adenosine monophosphate(cAMP)generation was done along with immunofluorescence studies to study the effects of FFAR2/FFAR3 *** measuring cell proliferation,we employed real time electrical impedancebased assay available from *** Microarray data analysis of CRC patient samples showed a significant down regulation of FFAR2 gene *** prompted us to study the FFAR2 in ***,FFAR3 shares significant structural and functional homology with FFAR2,we knocked down both these receptors in CRC cell line HCT *** modified cell lines exhibited higher proliferation rate and were found to have increased glucose uptake as well as increased level of glucose transporter ***,FFAR2 and FFAR3 signal through G protein subunit(Gαi),knockdown of these receptors was associated with increased *** of protein kinase A(PKA)did not alter the growth and proliferation of these cells indicating a mechanism independent of cAMP/PKA *** Our results suggest role of FFAR2/FFAR3 genes in increased proliferation of colon cancer cells via enhanced glucose uptake and exclude t

关键词： Cell proliferation Glucose transporter 1 Colorectal cancer Free fatty acids receptor 2 Free fatty acids receptor 3 Glucose uptake

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A Superaerophobic Bimetallic Selenides Heterostructure for Efficient Industrial-Level Oxygen Evolution at Ultra-High Current Densities

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Nano-Micro Letters 2020年第8期12卷 213-224页

作者： Jiaxin Yuan Xiaodi Cheng Hanqing Wang Chaojun Lei sameer Pardiwala Bin Yang Zhongjian Li Qinghua Zhang Lecheng Lei Shaobin Wang Yang Hou Key Laboratory of Biomass Chemical Engineering of Ministry of Education College of Chemical and Biological EngineeringZhejiang UniversityHangzhou 310027People’s Republic of China Institute of Zhejiang University-Quzhou Quzhou 324000People’s Republic of China Ningbo Research Institute Zhejiang UniversityNingbo 315100People’s Republic of China Zhejiang Provincial Key Laboratory of Advanced Chemical Engineering Manufacture Technology College of Chemical and Biological EngineeringZhejiang UniversityHangzhou 310027People’s Republic of China School of Chemical Engineering and Advanced Materials The University of AdelaideAdelaideSA 5005Australia

Cost-effective and stable electrocatalysts with ultra-high current densities for electrochemical oxygen evolution reaction(OER)are critical to the energy crisis and environmental ***,we report a superaerophobic three dimensional(3D)heterostructured nanowrinkles of bimetallic selenides consisting of crystalline NiSe2 and NiFe2Se4 grown on NiFe alloy(NiSe2/NiFe2Se4@NiFe)prepared by a thermal selenization *** this unique 3D heterostructure,numerous nanowrinkles of NiSe2/NiFe2Se4 hybrid with a thickness of ~100 nm are grown on NiFe alloy in a uniform *** by the large active surface area and high electronic conductivity,the superaerophobic NiSe2/NiFe2Se4@NiFe heterostructure exhibits excellent electrocatalytic activity and durability towards OER in alkaline media,outputting the low potentials of 1.53 and 1.54 V to achieve ultra-high current densities of 500 and 1000 mA cm^−2,respectively,which is among the most active Ni/Fe-based selenides,and even superior to the benchmark Ir/C *** in-situ derived FeOOH and NiOOH species from NiSe2/NiFe2Se4@NiFe are deemed to be efficient active sites for OER.

关键词： Superaerophobicity Bimetallic selenide Heterostructure electrocatalyst Strong interfacial coupling Oxygen evolution reaction

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Failure of intramedullary femoral nail with segmental breakage of distal locking bolts： a case report and review of the literature

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Chinese Journal of Traumatology 2011年第3期14卷 188-192页

作者： sameer Aggerwal Nitesh Gahlot Uttam C. Saini Kamal Bail Department of Orthopaedics Post Graduate Institute of Medical Education & Research Chandigarh 160012 India

Breakage of locking bolts is an important cause of interlocking nail failure in femoral fractures. It usually occurs in the form of single breakage in one of the distal bolts of the nail or nail breakage around the distal locking hole. Here we report an unusual ease ofintramedullary femoral nail failure with segmental breakage of both the distal locking bolts. Such a scenario usually complicates further management. We successfully managed this casewith exchange nailing without bone grafting. Here we briefly reviewed the literature regarding such an unusual presentation and discussed in detail the possible etiology of such a presentation and the management options when facing such a complex situation.

关键词： Femoral fractures Bone screws Fracture ftxation, intramedullary Fracture healing

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Performance Evaluation of Calcium Alkali-treated Oil Palm/Pineapple Fibre/Bio-phenolic Composites

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Journal of Bionic Engineering 2022年第5期19卷 1493-1503页

作者： sameer A.Awad Hassan Fouad Eman M.Khalaf N.Saba Hom N.Dhakal M.Jawaid Othman Y.Alothman Department of Chemistry School of Science and TechnologyUniversity of New EnglandArmidaleNSW 2351Australia Department of Chemistry College of Education for Pure ScienceUniversity of Al-AnbarRamadi 31001Iraq Biomedical Engineering Department Faculty of EngineeringHelwan UniversityHelwan 11792Egypt Pharmacy Department Al-Maarif University CollegeAnbar 3001 RamadiIraq Laboratory of Biocomposite Technology Institute of Tropical Forestry and Forest Products(INTROP)Universiti Putra Malaysia43400 SerdangMalaysia Advanced Polymers and Composites(APC)Research Group School of Mechanical and Design EngineeringUniversity of PortsmouthPortsmouth PO13DJUK Department of Chemical Engineering College of EngineeringKing Saud UniversityRiyadh 11433Saudi Arabia

The utilisation of oil palm fibre(OPF)and pineapple leaf fibres(PALF)as reinforcement materials for bio-phenolic composites is growing especially in automotive lightweight *** major aim of this current study is to investigate the influence of alkali(Ca(OH)_(2)) treatment on pure and hybrid *** effects of enhancements in chemical interactions were evaluated by the Fourier-Transform Infrared Spectrometer(FTIR).Dynamic Mechanical Analysis(DMA)and Thermogravimetric Analysis(TGA)performance of untreated reinforcements(OPF and PALF)and treated(OPF/OPF)composites at varying temperature and noted sufficient interfacial bonding contributing towards the improvements in thermal *** DMA results,the storage modulus improved with treated composites while the damping factor was ***,the treated hybrid composites exhibited significant improvements in thermal stability compared to untreated fibre *** results indicated that alkali calcium hydroxide(Ca(OH2(:T)incorporation in hybrid composites(OPF/PALF)results in increased tensile strength and modulus among all ***,the alkali-treated(Ca(OH)_(2))-treated pure composite(T/50%PALF),and hybrid composites(T/1OPF.1PALF)exhibited better flexural strength as compared with other *** contrast,the T/50%PALF showed higher flexural stress of 78.2 MPa,while the flexural modulus was recorded at 6503 *** can be proposed from the findings of this study that the alkali treatment(5%Ca(OH)_(2))can be utilised to improve the strength and efficiency of agriculture biomass to be used as reinforcements in ***,the hybridisation of bio-fibre composites has the potential as a novel variety of biodegradable and sustainable composites appropriate for several industrial and engineering applications.

关键词： Hybrid fibre composites Alkali treatments Surface modifications Mechanical properties Thermal stability

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RAPD-SCAR Markers: An Interface Tool for Authentication of Traits

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Journal of Biosciences and Medicines 2016年第1期4卷 1-9页

作者： sameer S. Bhagyawant School of Studies in Biotechnology Jiwaji University Gwalior India

The versatility of the PCR technique is that several kinds of primers can be explored for genome analysis depending on the purpose of study. The easy to access and low cost PCR-based markers include Random Amplified Polymorphic DNA (RAPD). The RAPD markers are easy to develop but lack of reproducibility makes it less reliable and obstacles to their further use in authentication of traits. In addition, other PCR and non PCR based markers like Amplified Fragment Length Polymorphism (AFLP), Simple Sequence Repeat (SSR) and Restriction Fragment Length Polymorphism (RFLP) are also employed in authentication of traits with certain restrictions vis-à-vis use of radioactive materials, high cost and requirement of sequence information etc. Therefore, this problem can be overcome by converting RAPD markers to more robust sequence characterized amplified regions i.e. SCAR markers. SCARs are locus specific, co-dominant in nature and amplified by PCR using specific 15 - 30 bp DNA fragments. For developing SCAR markers, primers are designed from the nucleotide sequences of a cloned RAPD fragments linked to a trait of interest. SCAR markers are easy to develop and reliable tools for DNA fingerprinting. This mini review is an attempt to summarize efficacy of RAPD-SCAR interface in authentication of traits.

关键词： SCAR Marker Molecular Marker

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Two-Phase Flow Modeling in a Single Closed Loop Pulsating Heat Pipes

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Journal of Donghua University(English Edition) 2007年第4期24卷 439-444页

作者：杨洪海 sameer Khandekar Sanka V. V.S. N.S. Manyam Manfred Groll College of Environmental Science and Engineering Donghua University Institute of Nuclear Technology and Energy System University of Stuttgart70569 StuttgartGermany

Mathematical modeling of pulsating heat pipes through ‘first’ principles is a contemporary problem which remains quite elusive. Simplifications and assumptions made in all the modeling approaches developed so far render them unsuitable for engineering design. In this paper, a more realistic modeling scheme is presented which provides considerable try for thought toward the next progressive step. At high enough heat flux level, closed loop pulsating heat pipes experience a bulk internal unidirectional fluid circulation. Under such a condition, conventional two-phase flow modeling in capillary tubes may be applied. This has been attempted for single-loop PHPs. A homogeneous model and a separated two-fluid flow model based on simultaneous conservation of mass, momentum and energy, have been developed for an equivalent ‘open flow’ system. The model allows prediction of two-phase flow parameters in each sub-section of the device thereby providing important insights into its operation. The concept of ‘void fraction constraint’ in pulsating heat pipe operation is introduced and its relevance to future modeling attempts is outlined.

关键词： Closed loop pulsating heat pipe flow modeling parametric influences

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A Spatial-Temporal Network Perspective for the Propagation Dynamics of Air Traffic Delays

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Engineering 2021年第4期7卷 452-464页

作者： Qing Cai sameer Alam Vu N.Duong School of Mechanical and Aerospace Engineering Nanyang Technological UniversitySingapore 639798Singapore

Intractable delays occur in air traffic due to the imbalance between ever-increasing air traffic demand and limited airspace *** air traffic is associated with complex air transport systems,delays can be magnified and propagated throughout these systems,resulting in the emergent behavior known as delay *** understanding of delay propagation dynamics is pertinent to modern air traffic *** this work,we present a complex network perspective of delay propagation ***,we model air traffic scenarios using spatial–temporal networks with airports as the *** establish the dynamic edges between the nodes,we develop a delay propagation method and apply it to a given set of air traffic *** on the constructed spatial-temporal networks,we suggest three metrics-magnitude,severity,and speed-to gauge delay propagation *** validate the effectiveness of the proposed method,we carry out case studies on domestic flights in the Southeastern Asia region(SAR)and the United *** demonstrate that the propagation magnitude in terms of the number of flights affected by delay propagation and the amount of propagated delays for the US traffic are respectively five and ten times those of the *** further reveal that the propagation speed for US traffic is eight times faster than that of the *** delay propagation dynamics reveal that about six hub airports in the SAR have significant propagated delays,while the situation in the United States is considerably worse,with a corresponding number of around *** work provides a potent tool for tracing the evolution of air traffic delays.

关键词： Air traffic Transport systems Delay propagation dynamics Spatial–temporal networks

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Efficacy of Single Dose of Mifepristone Combined with Two Doses of Misoprostol in Early Medical Abortions

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Journal of Reproduction and Contraception 2010年第1期21卷 35-40页

作者： Aarti Umranikar sameer Umranikar Specialist Registrar in Obstetrics & Gynaecology Southampton General HospitalSouthamptonU.K. Consultant in Obstetrics & Gynaecology North Hampshire NHS TrustU.K.

Objective To study the efficacy of single dose of mifepristone and two doses of misoprostol in women undergoing early medical abortion （EMA） up to 9 weeks of gestation. Methods An audit was performed on a retrospective data analysis of 162 women who underwent an early medical abortion in Southampton U.K. Relevant data on completeness of abortion and other details were analyzed. Results Majority of the women （67%） aged 20-30 years old, 22% were between 30 and 40 years old and 1% were above 40 years old when they came for abortion. About 94.5% women had complete abortion following the use of single dose mifepristone combined with two doses of misoprostol, 4.9% had an incomplete abortion and 0.6% had failure of the procedure. These figures had significantly improved over the results of similar audit in 2005 with single dose of misoprostol to women below 7 weeks of pregnancy. The results in this audit were 82.1% complete abortion, 7.2% incomplete abortion and O. 7% failed procedure. Conclusion Mifepristone in combination with two doses of misoprostol appears to be more effective in all cases of early medical abortion when compared with single dose of misoprostol for termination below 49 d （7 weeks） and two doses of misoprostol between 49 d and 63 d （7-9 weeks） of pregnancy.

关键词： mifepristone misoprostol early medical abortion (EMA) U.K.

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