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Flexural Strength and Load-Deflection Behaviour of Hybrid Thermoset Composites of Wood and Canola Biopolymers

Advanced Fiber Materials 2021年第5期3卷 331-346页

作者： Ikra Iftekhar Shuvo Md.Saiful hoque Md.Shadhin Lovely K.M.Khandakar University of Alberta EdmontonCanada University of Manitoba WinnipegCanada

The study aims to incorporate cellulosic canola(Brassica napus L.)biopolymers with wood biomass to increase flexural strength more than wood fraction alone.A facile fabrication process-at ambient temperature-is employed for ease of producing two different sets of bio-composites utilizing unsaturated polyester resin:pristine composite structures of 100%wood and hybrid composite structures of a canola-wood *** curing process is accompanied by methyl ethyl ketone peroxide(MEKP).Besides the lightweight feature,the hybrid composite structures exhibit maximum flexural strength up to 59.6 and 89.58 MPa at 2.5 and 5%fibre polymer fraction,outperforming the pristine wood composites(49.25 MPa).Also,the bending behaviours of the composite structures are illustrated by the load-deflection curves and the associated SEM micrographs display their fractured and debonded surface at the *** novel canola fibre benefits from its inherent hollow architecture,facilitating an excellent strength to weight ratio for the thermoset ***,canola displays a fibre diameter and density of 79.80(±41.31)μm and 1.34(±0.0014)g/cc,contributing effectively towards the flexure performance and high packing *** breaking tenacity(13.31±4.59 g-force/tex)and tensile strength(174.93±60.29)of canola fibres are comparable to other bast *** synergy among fibre diameters,density and break-ing tenacity creates a good interphase to successfully transfer the external compressive load from the resin matrix to the ***,the two-parameter Weibull distribution model is applied for predicting the failure and reliability probability of composite specimens against a wide range of compressive ***,prioritized SWOT factors have been summa-rized associated with the prospects and key challenges of canola biopolymers-an attempt to strategize the planning and decision-making process for a potential business *** introduction of canola into the pla

关键词： Flexural strength Load-deflection Fibre Composite Weibull distribution

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Polarization Insensitive Broadband Zero Indexed Nano-Meta Absorber for Optical Region Applications

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Computers, Materials & Continua 2022年第4期71卷 993-1009页

作者： Ismail Hossain Md Samsuzzaman Ahasanul hoque Mohd Hafiz Baharuddin Norsuzlin Binti Mohd Sahar Mohammad Tariqul Islam Space Science Center(ANGKASA) Universiti Kebangsaan Malaysia43600UKM BangiSelangorMalaysia Department of Computer and Communication Engineering Faculty of Computer Science and EngineeringPatuakhali Science and Technology UniversityDumki8602PatuakhaliBangladesh Department of Electrical Electronic and Systems EngineeringFaculty of Engineering and Built EnvironmentUniversiti Kebangsaan Malaysia43600UKM BangiSelangorMalaysia

Broadband response metamaterial absorber(MMA)remains a challenge among researchers.A nanostructured new zero-indexed metamaterial(ZIM)absorber is presented in this study,constructed with a hexagonal shape resonator for optical region *** design consists of a resonator and dielectric layers made with tungsten and quartz(Fused).The proposed absorbent exhibits average absorption of more than 0.8972(89.72%)within the visible wavelength of 450–600 nm and nearly perfect absorption of 0.99(99%)at 461.61 *** on computational analysis,the proposed absorber can be characterized as *** developments of ZIM absorbers have demonstrated plasmonic resonance characteristics and a perfect impedance *** incidence obliquity in typically the range of 0◦–90◦both in TE and TM mode with maximum absorbance is more than 0.8972(∼89.72%),and up to 45◦angular stability is suitable for solar cell applications,like exploiting solar *** proposed structure prototype is designed and simulated by studying microwave technology numerical computer simulation(CST)*** finite integration technique(FIT)based simulator CST and finite element method(FEM)based simulator HFSS also helps validate the numerical data of the proposed ZIM *** proposed MMA design is appropriate for substantial absorption,wide-angle stability,absolute invisible layers,magnetic resonance imaging(MRI),color images,and thermal imaging applications.

关键词： Hexagonal resonator loaded star shaped polarization insensitive compact broadband metamaterial absorber optical region applications

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Magnetic properties of Sn-substituted Ni-Zn ferrites synthesized from nano-sized powders of NiO, ZnO, Fe2O3, and SnO2

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Chinese Physics B 2017年第7期26卷 377-382页

作者： M A Ali M M Uddin M N I Khan F U Z Chowdhury S M hoque S I Liba Department of Physics Chittagong University of Engineering and Technology (CUET) Materials Science Division Atomic Energy Center

A series of Ni0.6-x/2Zn0.4-x/2SnxFe2O4(x = 0.0, 0.05, 0.1, 0.15, 0.2, and 0.3)(NZSFO) ferrite composities have been synthesized from nano powders using a standard solid state reaction technique. The spinel cubic structure of the investigated samples has been confirmed by x-ray diffraction(XRD). The magnetic properties such as saturation magnetization(Ms),remanent magnetization(Mr), coercive field(Hc), and Bohr magneton(μ) are calculated from the hysteresis loops. The value of Msis found to decrease with increasing Sn content in the samples. This change is successfully explained by the variation of A-B interaction strength due to Sn substitution in different sites. The compositional stability and quality of the prepared ferrite composites have also been endorsed by the fairly constant initial permeability(μ’) over a wide range of frequency. The decreasing trend of μ’ with increasing Sn content has been observed. Curie temperature TChas been found to increase with the increase in Sn content. A wide spread frequency utility zone indicates that the NZSFO can be considered as a good candidate for use in broadband pulse transformers and wide band read-write heads for video recording. The composition of x = 0.05 shows unusual results and the possible reason is also mentioned with the established formalism.

关键词： magnetic properties saturation magnetization permeability Curie temperature

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Social-ecological dynamics of the small scale fisheries in Sundarban Mangrove Forest, Bangladesh

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Aquaculture and Fisheries 2018年第1期3卷 38-49页

作者： Mohammad Mojibul hoque Mozumder MdMosta MdRashed-Un-Nabi Ehsanul Karim Faculty of Biological and Environmental Science University of HelsinkiFin 00014Finland Department of Coastal and Marine Fisheries Sylhet Agricultural UniversitySylhet 3100Bangladesh Institute of Marine Sciences and Fisheries University of ChittagongChittagong 4331Bangladesh Bangladesh Fisheries Research Institute(BFRI) MymensinghBangladesh

The Sundarban Mangrove Forest(SMF)is an intricate ecosystem containing the most varied and profuse natural resources of *** study presents empirical research,based on primary and secondary data,regarding the social-ecological system(SES),social-ecological dynamics,different stakeholders and relevant management policies of small-scale or artisanal fisheries such as the SMF;showing how,despite extensive diversification,the livelihood activities of the artisanal fishers in the SMF all depend on the forest *** of this critical importance of mangroves,however,deforestation continues due to immature death of mangroves,illegal logging,increased salinity,natural disasters and significant household consumption of mangrove wood by local *** the mangroves are destroyed fish stocks,and other fishery resources are reduced,leading to moves of desperation among those whose livelihood has traditionally been *** present study also considers several risks and shock factors in the fishers'livelihood:attacks by wild animals(especially tigers)and local bandits,illness,natural disasters,river bank erosion,and the cost of paying off corrupt *** artisanal fishers of the SMF have adopted different strategies for coping with these problems:developing partnerships,violating the fisheries management laws and regulations,migrating,placing greater responsibility on women,and bartering fishing knowledge and *** study shows how the social component(human),the ecological component(mangrove resources)and the interphase aspects(local ecological knowledge,stakeholder's interest,and money lenders or middle man roles)of the SMF as an SES are linked in mutual *** furthermore considers how the social-ecological dynamics of the SMF have negative impacts on artisanal fishermen's *** there is an urgency to update existing policies and management issues for the sustainable utilization of the SMF resources,eventually contri

关键词： Sundarban Artisanal fishery Social-ecological dynamics Livelihood Management policies

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A model of seasonal foliage dynamics of the subtropical mangrove species Rhizophora stylosa *** at the northern limit of its distribution

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Forestry Studies in China 2014年第3期16卷 147-157页

作者： Sahadev Sharma A T M RafiquI hoque Kangkuso Analuddin Akio Hagihara Graduate School of Engineering and Science University of the Ryukyus Department of Mechanical and Environmental Informatics Tokyo Institute of Technology Institute of Forestry and Environmental Sciences Chittagong University Department of Biology Haluoleo University Laboratory of Ecology and Systematics Faculty of ScienceUniversity of the Ryukyus

Background： Progress of forest production in response to the environment requires a quantitative understanding of leaf area development. Therefore, it is necessary to investigate the dynamics of seasonal crown foliage in order to understand the productivity of mangroves, which play an important role in the subtropical and tropical coastlines of the world. Method： Crown foliage dynamics of the mangrove Rhizophora styloso were studies to reveal patterns of leaf recruitment, survival and seasonal leaf area growth. Results： Flushing of leaves occurred throughout the year, but both flushing and leaf area growth pattern of leaves varied with season. Maximum flushing occurred in summer, but leaf areas did not differ significantly with season. The half-expansion period is longer, and the intrinsic rate of increase was lower in winter. Summer flushed leaves grew faster at their initial stage and reached their maximum area over a shorter period of time. The difference in temperature and air vapor pressure deficit （VPD） between summer and winter contributed to the present dynamics of foliage patterns. The mean leaf longevity was estimated to be 13.1 month. The crown foliage area was almost stable throughout the year. Conclusions： Homeostatic control of the crown foliage area may be accompanied by the existence of ecophysiological mechanisms in R. stylosa. Integrating crown foliage dynamics into forest models represents an important step towards incorporating physiological mechanisms into the models for predicting growth responses to environmental changes and for understanding the complex responses of tree growth and litter production.

关键词： Crown foliage area Rhizophora stylosa Leaf area growth Leaf survivorship Litterfall Temperature

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Fate and transport of enveloped viruses in indoor built spaces-through understanding vaccinia virus and surface interactions

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Biomaterials Translational 2021年第1期2卷 50-60页

作者： Dahae Seong Monchupa Kingsak Yuan Lin Qian Wang Shamia hoque Department of Civil and Environmental Engineering University of South Carolina Columbia SC USA.

The current coronavirus disease 2019(COVID-19)pandemic has reinforced the necessity of understanding and establishing baseline information on the fate and transport mechanisms of viruses under indoor environmental *** governing virus interactions in built spaces have thus far been established based on our knowledge on the interaction of inorganic particles in indoor spaces and do not include characteristics specific to *** have explored the biological and kinetic processes of microbes’attachments on surfaces in other fields but not in the built *** is also extensive literature on the influence of indoor architecture on air flow,temperature profiles,and forces influencing aerosol *** the gap between these fields will lead to the generation of novel frameworks,methodologies and know-how that can identify undiscovered pathways taken by viruses and other microbes in the built *** study summarizes the assessment of the influence of surface properties on the adhesion kinetics of vaccinia virus on gold,silica,glass,and stainless-steel *** found that on gold the virus layer was more viscoelastic compared to *** was negligible removal of the layer from the stainless-steel surface compared to the *** results further highlight the importance of converging different fields of research to assess the fate and transport of microbes in indoor built spaces.

关键词： adhesion kinetics aerosols built environment resuspension surface properties ventilation

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Sigmoidal Particle Swarm Optimization for Twitter Sentiment Analysis

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Computers, Materials & Continua 2023年第1期74卷 897-914页

作者： Sandeep Kumar Muhammad Badruddin Khan Mozaherul hoque Abul Hasanat Abdul Khader Jilani Saudagar Abdullah AlTameem Mohammed AlKhathami Department of Computer Science and Engineering CHRIST(Deemed to be University)Bangalore560074India Information Systems Department College of Computer and Information SciencesImam Mohammad Ibn Saud Islamic University(IMSIU)Riyadh11432Saudi Arabia

Social media,like Twitter,is a data repository,and people exchange views on global issues like the COVID-19 *** media has been shown to influence the low acceptance of *** work aims to identify public sentiments concerning the COVID-19 vaccines and better understand the individual’s sensitivities and feelings that lead to *** work proposes a method to analyze the opinion of an individual’s tweet about the COVID-19 *** paper introduces a sigmoidal particle swarm optimization(SPSO)***,the performance of SPSO is measured on a set of 12 benchmark problems,and later it is deployed for selecting optimal text features and categorizing *** proposed method uses TextBlob and VADER for sentiment analysis,CountVectorizer,and term frequency-inverse document frequency(TF-IDF)vectorizer for feature extraction,followed by SPSO-based feature *** Covid-19 vaccination tweets dataset was created and used for training,validating,and *** proposed approach outperformed considered algorithms in terms of ***,we augmented the newly created dataset to make it balanced to increase performance.A classical support vector machine(SVM)gives better accuracy for the augmented dataset without a feature selection *** shows that augmentation improves the overall accuracy of tweet *** the augmentation performance of PSO and SPSO is improved by almost 7%and 5%,respectively,it is observed that simple SVMwith 10-fold cross-validation significantly improved compared to the primary dataset.

关键词： Twitter data analysis sentiment analysis social media analytics swarm intelligence COVID-19 vaccine

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A New Surgical Technique of Biliary Drainage

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International Journal of Clinical Medicine 2013年第9期4卷 400-404页

作者： Shafiqul hoque Bangabandhu Sheikh Mujib Medical University Dhaka Bangladesh

Introduction: Roux-en-Y Hepatico-jejunostomy is the standard technique of biliary reconstruction after excision of choledochal cyst. Here the author describes a new surgical technique of biliary reconstruction using native gall bladder as biliary conduit. New Surgical Technique: The choledochal cyst is excised as standard technique but gall bladder with its neck is kept in situ. The gall bladder neck is anastomosed with the common hepatic duct stump and gall bladder fundus is anastomosed with the antero-inferior wall of the first part of distal duodenum. Materials & Methods: Eleven patients with choledochal cyst have been operated with the new technique from July 2011 to December 2012 in the city of Dhaka, Bangladesh. Feeding was started from 3rd post-operative day and drain was removed by 7th day unless complicated and they were released from the hospital between 10-15 days. Results: The ages of eleven patients were from 3 months to 11 years. There were 7 females and 4 males. Lump was felt in 3 patients and jaundice was present in 4 patients. Recurrent abdominal pain was present in all patients. They were diagnosed by ultrasonography and MRCP was done in 6 patients only. Prothrombin time was elevated by 10% & 15% in 2 patients. Average operation time was 2 hours and 10 minutes. A 9-year girl died suddenly and unexpectedly on the 5th post-operative day from severe convulsion of unknown origin. One child suffered from prolonged bile leakage and re-explored to repair anastomotic leak. Another patient had a collection near the anastomosis which resolved spontaneously. Discussion: Benefits of the new surgical technique are total absence of Roux-en-Y related intestinal complications. Possible disadvantages are discussed. It is anatomical and physiological. Small incision and less operation time are other benefits which need to be mentioned. Possible disadvantages are discussed.

关键词： Biliary Reconstruction Bilioenteric Anastomosis Choledocho-Cholecystostomy Cholecysto-Duodenostomy Choledocho-Cholecysto-Duodenostomy

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An Overview of 3D Thin Shell Textile Preforms

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Journal of Textile Science and Technology 2023年第3期9卷 183-197页

作者： Mohammad Toufiqul hoque Department of Textile and Clothing Technology Hochschule Niederrhein University of Applied Sciences M&oumlnchengladbach Germany

The automobiles, aircraft, and lightweight industries continuously demand thin near-net-shape preforms just out-of-machine as close to the final shape. This study addresses the possibilities of 3D thin shell textile preform as the solution of lightweight reinforcement in various applications. Investigation into the development of 3D thin shells has led to different manufacturing processes. However, 3D thin shell preforms are mostly made by weaving and knitting, but nonwoven, winding, and/or layup techniques have been reported for over a decade. Owing to the complex thin shell manufacturing processes, they are not similar to the conventional methods. The different 3D thin shell preforms can extend the opportunities for new applications in various technical fields. This study presents existing research gaps and a few potential issues to be solved regarding 3D thin shell preforms in the near future.

关键词： 3D Thin Shell Preform Weaving Knitting Braiding Nonwoven Winding and/or Layup

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An Optimized Offloaded Task Execution for Smart Cities Applications

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Computers, Materials & Continua 2023年第3期74卷 6321-6334页

作者： Ahmad Naseem Alvi Muhammad Awais Javed Mozaherul hoque Abul Hasanat Muhammad Badruddin Khan Abdul Khader Jilani Saudagar Mohammed Alkhathami Department of Electrical and Computer Engineering COMSATS University Islamabad45550Pakistan Information Systems Department College of Computer and Information SciencesImam Mohammad Ibn Saud Islamic University(IMSIU)Riyadh11432Saudi Arabia

Wireless nodes are one of the main components in different applications that are offered in a smart *** wireless nodes are responsible to execute multiple tasks with different priority *** the wireless nodes have limited processing capacity,they offload their tasks to cloud servers if the number of tasks exceeds their task processing *** these tasks from remotely placed cloud servers causes a significant delay which is not required in sensitive task *** execution delay is reduced by placing fog computing nodes near these application nodes.A fog node has limited processing capacity and is sometimes unable to execute all the requested *** this work,an optimal task offloading scheme that comprises two algorithms is proposed for the fog nodes to optimally execute the time-sensitive offloaded *** first algorithm describes the task processing criteria for local computation of tasks at the fog nodes and remote computation at the cloud *** second algorithm allows fog nodes to optimally scrutinize the most sensitive tasks within their task *** results show that the proposed task execution scheme significantly reduces the execution time and most of the time-sensitive tasks are executed.

关键词： Smart cities fog computing task offloading knapsack

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