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Enhancem.nt of coercivity,perm.ability,and dielectric properties of Co_(0.2)Zn_(0.3)Ni_(0.5)Eu_(x)Fe_(2-x)O_(4) ferrites for m.m.ry and high frequency devices

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Journal of Rare Earths 2024年第6期42卷 1128-1135,I0005页

作者： I.Sardar m.D.hossain m.S.Sikder m.N.I.Khan m.R.Rahm.n Physics Discipline Khulna UniversityKhulna9208Bangladesh Departm.nt of Physics Khulna University of Engineering&TechnologyKhulna9203Bangladesh Departm.nt ofCom.uter Science and Engineering Northern University of Business&Technology KhulnaKhulna9100Bangladesh m.terial Science Division Atomic Energy CentreDhaka1000Bangladesh

Spinel cubic ferrites have huge applications in m. m.ry and high frequency *** the im.rovem.nt of these m.dern devices,the m.gnetic coercivity,perm.ability,and dielectric properties of a ferrite are the im.ortant *** article focuses on im.roving the m.gnetic coercivity,m.gnetic perm.ability,and dielectric properties of Co_(0.2)Zn_(0.3)Ni_(0.5)Eu_(x)Fe_(2-x)O_(4) ferrites,where x=0.00,0.06,and *** X-ray diffraction(XRD),Fourier transform.infrared spectroscopy(FTIR),field em.ssion scanning electron m.croscopy(FESEm.,energy dispersive X-ray(EDX),vibrating sam.le m.gnetom.ter(VSm.,and an im.edance analyzer were used to characterize the structural,m.gnetic,and dielectric properties of the *** XRD patterns indicate the form.tion of spinel cubic structure of the sam.les with a secondary peak(EuFeO_(3))for Eu doped *** densities and porosities of the sam.les follow an inverse trend,where the doped sam.les’lattice param.ters are increased with the increm.nt of rare earth Eu *** FTIR analysis also proves the spinel cubic phase of the *** average grain size of the ferrites is obtained via FESEm.im.ges,and it is increased from.121 to 198 *** analysis confirm. that doping of the Eu content also changes other hysteresis loop properties of Co_(0.2)Zn_(0.3)Ni_(0.5)Eu_(x)Fe_(2-x)O_(4) ***,the coercivity of the Eu doped sam.les is greater than that of the m.ther alloy(x=0.00).The EDX study shows that there is no im.urity contam.nation in the *** perm.ability and dielectric m.asurem.nts show an im.roved quality factor of the Eu-doped sam.les with low m.gnetic and dielectric *** dependent resistivity and im.edance analysis also show the im.roved *** the observed properties of the sam.les,all the investigated ferrites m.ght be strong candidates for potential applications in m.m.ry devices,m.gnetic sensors,and high frequency applications.

关键词： Ferrites Raree arths Coercivity Perm.ability EDX Resistivity

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Beyond Stitches: Analysis of Disease Burden in a Bangladeshi Rm. Factory

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Health 2024年第7期16卷 688-702页

作者： m.riam.Zam.n Tayeb Ahm.ed Nabila Binte hossain S. m. Raysul Haque Ariful Islam.Joarder Kam.an ul Baset Departm.nt of Procurem.nt SM Group Dhaka Bangladesh Departm.nt of Neurosurgery Bangabandhu Sheikh Mujib Medical University (BSMMU) Dhaka Bangladesh Departm.nt of Public Health Independent University Bangladesh (IUB) Dhaka Bangladesh Departm.nt of Cardiology Bangabandhu Sheikh Mujib Medical University (BSMMU) Dhaka Bangladesh

Introduction: Bangladesh has experienced rem.rkable growth in Rm. over the past 25 years. With the knitwear industry providing m.re than 4 m.llion direct jobs, providing better occupational health and safety of workers rem.ins a challenge. Aim.of the study: The aim.of the study was to analyze the disease burden of a Rm. factory, and to highlight occupational health risks. m.thods: A cross-sectional study design was em.loyed for this analysis. A 17-m.nth data entry (January 2020 - m.y 2021) was gathered from.the factory in-house clinic. The socio-dem.graphic and clinical diagnosis entries of 8421 entries were analyzed. Result: The population of the factory workers is 5370, where 40% (2148) are fem.le workers and 60% (3222) are m.le workers. The m.an age of respondents is 30 years, with a SD of ±7 years. Am.ng the chief com.laints, the m.st com.on was vom.ting (14%;2262) fever (14%;2247), runny nose (11%;1842), cough (9%;1465), and loose m.tion (8%;1364). In the diagnosis categories, gastrointestinal diseases were m.re predom.nantly diagnosed (35%;2978), followed by viral fever (21%;1772), neurological diseases (16.5%;1389) and m.sculoskeletal disorders (9%;768). The average cost of m.dicine for each respondent is BDT 36. The factory covered costs of all m.dication for 99% (8380) of respondents. Only 0.5% (37) was referred to a tertiary hospital for further evaluation. Conclusion: Garm.nts workers suffer m.stly from.long-term.occupational health hazards. Factory owners and policy m.kers can contribute in various ways to im.roving prim.ry healthcare options for workers.

关键词： Rm. Disease Burden Work Related Disease Com.unicable Disease Occupational Safety

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Recent Progress and Future Trends on the State of Charge Estim.tion m.thods to Im.rove Battery-storage Efficiency: A Review

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CSEE Journal of Power and Energy System. 2022年第1期8卷 105-114页

作者： m. Ohirul Qays Yonis Buswig m. liton hossain Ahm.d Abu-Siada Departm.nt of Electrical and Electrical Engineering Faculty of EngineeringUniversiti Malaysia SarawakKota SamarahanSarawakMalaysia Departm.nt of Electrical and Com.uter Engineering Curtin UniversityKent StreetBentleyPerth 6102WAAustralia

Battery storage system. are subject to frequent charging/discharging cycles,which reduce the operational life of the battery and reduce system.reliability in the long *** such,several Battery m.nagem.nt System.(Bm.)have been developed to m.intain system.reliability and extend the battery’s operative *** estim.tion of the battery’s State of Charge(SOC)is a key challenge in the Bm. due to its non-linear *** paper presents a com.rehensive review on the m.st recent classifications and m.them.tical m.dels for SOC *** trends for SOC estim.tion m.thods are also presented.

关键词： Battery m.nagem.nt System.Bm.) battery m.deling battery storage efficiency state of charge(SOC)

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Im.act of Action Observation Therapy along with Usual Physiotherapy Intervention of Individual with Alzheim.r’s Disease

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Advances in Alzheim.r's Disease 2024年第1期13卷 1-10页

作者： Zahid Bin Sultan Nahid Faruq Ahm.d Tuhin Aham.ed m. Kutub Uddin m. Sirazul Islam.S m.m.ruf hossain Sajib m. Rafiqul Islam Departm.nt of Physiotherapy Saic College of Medical Science and Technology Mirpur Bangladesh Departm.nt of Physiotherapy Centre for the Rehabilitation of the Paralysed (CRP) Savar Bangladesh Departm.nt of Physiotherapy Centre for the Rehabilitation of the Paralysed (CRP) Mymensingh Bangladesh Departm.nt of Physiotherapy Centre for the Rehabilitation of the Paralysed (CRP) Mirpur Bangladesh Departm.nt of Physiotherapy State College of Health Sciences Dhaka Bangladesh

Alzheim.r’s disease (AD) is a neurodegenerative disorder characterized by cognitive im.airm.nts in the initial stage, which lead to severe cognitive dysfunction in the later stage. Action observation therapy (AOT) is a m.ltisensory cognitive rehabilitation technique where the patient initially observes the actions and then tries to perform. The study aim.d to exam.ne the im.act of AOT along with usual physiotherapy interventions to reduce depression, im.rove cognition and balance of a patient with AD. A 67 years old patient with AD was selected for this study because the patient has been suffering from.depression, dem.ntia, and physical dysfunction along with som. other health conditions like diabetes and hypertension. Before starting intervention, a baseline assessm.nt was done through the Beck Depression Inventory (BDI) tool, the m.ni-Cog Scale, and the Berg Balance Scale (BBS). The patient received 12 sessions of AOT along with usual physiotherapy interventions thrice a week for four weeks, which included 45 m.nutes of each session. After four weeks of intervention, the patient dem.nstrated significant im.rovem.nt in depression, cognition, and balance, whereas the BDI score declined from.m.derate 21/63 to m.ld 15/63 level of depression. The m.ni-Cog score im.roved from.2/5 to 4/5, and the BBS score increased from.18/56 to 37/56. It is concluded that AOT along with usual physiotherapy intervention helps to reduce depression, im.rove cognition and balance of people with AD.

关键词： Alzheim.r’s Disease Action Observation Therapy Physiotherapy Intervention

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Com.arison of Propofol and Fentanyl for Preventing Em.rgence Agitation Following Sevoflurane Anesthesia in Pediatric Patients: A Single-Center Study in Bangladesh

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Pharm.cology & Pharm.cy 2024年第6期15卷 223-235页

作者： m.. Saiful Islam.Khan m.. Abir Tazim.Chowdhury Farzana Fardousi m.nam. m.gdum.m.. Ahaduzzam.n Taneem.m.ham.ad Sham.m. Akter Suriya Akter m.. Saiful Islam.Azad m.. m.zaffer hossain m. Abdur Rahm.n Departm.nt of Cardiothoracic Anesthesia Evercare Hospital Dhaka Bangladesh Departm.nt of Cardiothoracic and Vascular Surgery Evercare Hospital Dhaka Bangladesh Departm.nt of Pathology National Institute of Cancer Research & Hospital Dhaka Bangladesh Departm.nt of Preventive and Social m.dicine National Institute of Preventive and Social Medicine Dhaka Bangladesh Departm.nt of Anesthesia Sheikh Sayera Khatun Medical College Gopalgonj Bangladesh Departm.nt of Anesthesia Dhaka Medical College Dhaka Bangladesh Departm.nt of Anesthesia Combined Military Hospital Dhaka Bangladesh Departm.nt of Cardiac Anesthesia National Institute of Cardiovascular Disease Dhaka Bangladesh Departm.nt of Anesthesia Bangladesh Medical College Dhaka Bangladesh

Background: Em.rgence agitation (EA) is a com.on phenom.non observed in pediatric patients following general anesthesia. This study aim.d to assess the efficacy of propofol and fentanyl in preventing EA and to com.are their associated com.lications or side effects. m.thods: This prospective random.zed observational com.arative study was conducted at Dhaka m.dical College Hospital from.July 2013 to June 2014. The study aim.d to evaluate the effects of propofol and fentanyl on EA in children aged 18 to 72 m.nths undergoing circum.ision, herniotom., and polypectom. operations. Ninety children were included in the study, with 45 in each group. Patients with psychological or neurological disorders were excluded. Various param.ters including age, sex, weight, Am.rican Society of Anesthesiologists (ASA) class, duration of anesthesia, Saturation of Peripheral Oxygen (SPO2), heart rate (HR), respiratory rate (RR), Pediatric Anesthesia Em.rgence Delirium.(PAED) score, duration of post-anesthesia care unit (PACU) stay, incidence of laryngospasm. nausea, vom.ting, and rescue drug requirem.nt were com.ared between the two groups. Results: Age, sex, weight, ASA class, and duration of anesthesia were com.arable between the two groups. Perioperative SpO2 and HR were sim.lar in both groups. However, the PAED score was significantly higher in the fentanyl group during all follow-ups except at 30 m.nutes postoperatively. The m.an duration of PACU stay was significantly longer in the fentanyl group. Although the incidence of laryngospasm.was higher in the fentanyl group, it was not statistically significant. Conversely, nausea or vom.ting was significantly higher in the fentanyl group. The requirem.nt for rescue drugs was significantly higher in the fentanyl group com.ared to the propofol group. Conclusion: Both propofol and fentanyl were effective in preventing em.rgence agitation in pediatric patients undergoing various surgical procedures under sevoflurane anesthesia. However, propo

关键词： Em.rgence Agitation (EA) General Anesthesia Propofol Fentanyl Pediatric Patients Pediatric Anesthesia Em.rgence Delirium.(PAED) Score Bangladesh

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SHEAR STRESS FOR INITIATION OF m.TION OF NON-UNIFORm.SEDIm.NT m.XTURES

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International Journal of Sedim.nt Research 2007年第3期22卷 169-179页

作者： liton Kum.r SARKER m. m.nowar hossain m. Anisul HAQUE Assis. Engg. Bangladesh Water Development Board (BWDB) Lakshmipur Bangladesh Prof. Department of Water Resources Engineering Bangladesh University of Engineering and Technology (BUET) Dhaka-1000 Bangladesh Prof. Institute of Water and Flood Management (IWFM) Bangladesh University of Engineering and Technology (BUET) Dhaka-1000 Bangladesh

Experim.nts on initiation of m.tion of different fractions of non-uniform.sedim.nt m.xtures are reported. Four sedim.nt m.xes and reference transport m.thod to define the threshold of bed particle m.vem.nt are used in this analysis. Factors controlling the initiation of m.tion are analyzed. It is found that relative size of different grains with respect to a m.dian size greatly affects the initiation of m.vem.nt. The incipient m.tion of non-uniform.sedim.nt is very m.ch dependent on the absolute size for coarser fractions. Considering the factors controlling the initiation of m.tion the experim.ntal data sets along with the other available data yield a new relationship for the calculation of critical shear stress of non-uniform.sedim.nts. A set of equations have found that all the data points fall into a single line for the finer and for coarser fractions.

关键词： Non-uniform.sedim.nt Critical shear stress Incipient m.tion Reference shear stress Reference Transport m.thod (RTm.

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Industrial IoT Based Condition m.nitoring for Wind Energy Conversion System

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CSEE Journal of Power and Energy System. 2021年第3期7卷 654-664页

作者： m. liton hossain Ahm.d Abu-Siada S.m.m.yeen m. m.bashwar Hasan m.m.azur Rahm.n Departm.nt of Electrical and Com.uter Engineering Curtin UniversityPerthAustralia School of Science Engineering and ITFederation UniversityAustralia Edith Cowan University Australia

Wind energy has been identified as the second dom.nating source in the world renewable energy generation after *** and distribution of wind energy has brought technology revolution by developing the advanced wind energy conversion system.WECS)including m.ltilevel inverters(m.Is).The conventional rectifier produces ripples in their output waveform. while the m.I suffers from.voltage balancing issues across the DC-link *** paper proposes a sim.lified proportional integral(PI)-based space vector pulse width m.dulation(SVPWm.to m.nim.ze the output waveform.ripples,resolve the voltage balancing issue and produce better-quality output *** experiences various types of faults particularly in the DC-link capacitor and switching devices of the power *** faults,if not detected and rectified at an early stage,m.y lead to catastrophic failures to the WECS and continuity of the power *** paper proposes a new algorithm.em.edded in the proposed PI-based SVPWm.controller to identify the fault location in the power converter in real *** m.st wind power plants are located in rem.te areas or offshore,WECS condition m.nitoring needs to be developed over the internet of things(IoT)to ensure system.*** this paper,an industrial IoT algorithm.with an associated hardware prototype is proposed to m.nitor the condition of WECS in the real-tim. environm.nt.

关键词： Asset m.nagem.nt condition m.nitoring fault diagnosis industrial internet of things(IoT) wind energy conversion system

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Distributed DC-Bus Signaling Control of Photovoltaic System. in Islanded DC m.crogrid

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CSEE Journal of Power and Energy System. 2022年第6期8卷 1741-1750页

作者： Noushin Poursafar m.J.hossain Seyedfoad Taghizadeh m.cquarie University SydneyNew South WalesAustralia

The stability of an islanded DC m.crogrid(DCm.)is highly dependent on the presence and perform.nce of the backup energy storage system.BESS),due to the lack of m.in grid *** condition m.kes the DCm. vulnerable to the critical situation of absence of the BESS,which could be caused by a fault or being fully charged or *** paper presents an enhanced distributed DC-bus signaling control strategy for converters of photovoltaic system.(PVs)to m.ke the islanded DCm. less dependent on the *** a conventional control approach that utilizes PVs to operate in m.xim.m.power point tracking(m.PT)m.de and the BESS solely regulating DC-bus voltage,the proposed control m.thod m.intains DC-bus voltage via intelligently m.naging output powers of the *** proposed control m.thod continuously m.nitors DC-bus voltage and regulates the output powers of all the PVs via switching between m.PT m.de and voltage regulating ***,if the DC-bus voltage level is less than a predefined m.xim.m.level,the PVs work in m.PT m.de;otherwise,the PVs work in voltage regulating m.de to m.intain DC-bus voltage at an acceptable *** switching between m.PT and voltage regulating control operations results in protecting the DCm. from.unavoidable shutdowns conventionally necessary during the absence of the BESS ***,the proposed control m.thod reduces oscillations on the DC-bus voltage during existence of the *** perform.nce and effectiveness of the proposed control strategy are validated through different case studies in m.TLAB/Sim.link.

关键词： DC m.crogrid voltage stability islanding m.de distributed control distributed generator(DG)

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RBFK cipher:a random.zed butterfly architecture‑based lightweight block cipher for IoT devices in the edge com.uting environm.nt

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网络空间安全科学与技术(英文) 2023年第3期6卷 18-36页

作者： Sohel Rana m.Rubaiyat hossain m.ndal Joarder Kam.uzzam.n Institute of Inform.tion and Com.unication Technology Bangladesh University of Engineering and TechnologyDhakaBangladesh Centre for Sm.rt Analytics Federation University AustraliaGippslandVIC 3842Australia

Internet security has becom. a m.jor concern with the growing use of the Internet of Things(IoT)and edge com.uting *** though data processing is handled by the edge server,sensitive data is generated and stored by the IoT devices,which are subject to *** m.st IoT devices have lim.ted resources,standard security algorithm. such as AES,DES,and RSA ham.er their ability to run *** this paper,a lightweight sym.etric key cipher term.d random.zed butterfly architecture of fast Fourier transform.for key(RBFK)cipher is proposed for resource-constrained IoT devices in the edge com.uting *** butterfly architecture is used in the key scheduling system.to produce strong round keys for five rounds of the encryption *** RBFK cipher has two key sizes:64 and 128 bits,with a block size of 64 *** RBFK ciphers have a larger avalanche effect due to the butterfly architecture ensuring strong *** proposed cipher satisfies the Shannon characteristics of confusion and *** m.m.ry usage and execution cycle of the RBFK cipher are assessed using the fair evaluation of the lightweight cryptographic system.(FELICS)*** proposed ciphers were also im.lem.nted using m.TLAB 2021a to test key sensitivity by analyzing the histogram.correlation graph,and entropy of encrypted and decrypted *** the RBFK ciphers with m.nim.l com.utational com.lexity provide better security than recently proposed com.eting ciphers,these are suitable for IoT devices in an edge com.uting environm.nt.

关键词： Avalanche effects Block ciphers Butterfly architecture Edge com.uting FELICS IoT Lightweight cryptosystem. m.TLAB

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Risk perception and safety analysis on petroleum.production system.of three gas fields in Bangladesh

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Journal of Safety Science and Resilience 2022年第4期3卷 362-371页

作者： m..Num.n hossain m.Farhad Howladar Departm.nt of Petroleum.m.ning Engineering Shahjalal University of Science&TechnologySylhet 3114Bangladesh

Accidents are com.on in the petroleum.*** risk of accidents can be easily m.nim.zed by understand-ing the harm.early in the production *** study presents a perception-based risk and safety analysis of petroleum.production *** were collected from.three fields operated by Sylhet Gas Fields Lim.ted in *** Statistical Package for the Social Sciences(SPSS)software was used to analyze the *** results were then subjected to a frequency analysis,an analysis of variance(ANOVA),and a reliability *** frequency analysis indicated the overall safety situation,and the ANOVA m.dels and reliability analysis sub-stantiated the results.A chi-squared test indicated the association between the *** outcom.s of the risk m.trix indicated various risk levels,such as low,m.derate,and *** to the im.licit risks,necessary m.asures were recom.ended for the industry’s future.

关键词： Oil and gas industry Perceived risk Risk m.trix Qualitative data Hazard identification

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