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Blockchain-based COVID vaccination registration and monitoring

Blockchain(Research and Applications) 2022年第4期3卷 44-55页

作者： Shirajus Salekin Nabil md Sabbir Alam Pran Ali Abrar Al Haque Narayan Ranjan Chakraborty Mohammad Jabed Morshed Chowdhury md sadek ferdous Daffodil International University Dhaka1207Bangladesh La Trobe University VIC3086Australia BRAC University Dhaka1212Bangladesh

COVID-19 has changed almost all aspects of our *** around the world have imposed lockdowns to slow down the ***,we have found the vaccine,in fact,a good number of ***,managing the testing and vaccination process of the total population is a mammoth ***,there are always delays or data silo problems in multi-organizational ***,streamlining this process is vital to improve efficiency and save more *** of its effective data sharing mechanism among different entities with a number of security features,blockchain can be an effective tool for different applications in the health ***,blockchain provides a distributed system along with greater privacy,transparency,and *** this article,we have presented a blockchain-based system that seamlessly integrates testing and vaccination systems,allowing the system to be *** instant verification of any tamper-proof COVID-19 test result has been developed,which will serve as“Test Certificates”.A transparent and efficient vaccination system has also been exhibited and implemented as the“Digital Vaccine Passport”(DVP)*** infection rate-based prioritization will ensure a transparent and fair vaccination process as well as tackle the distribution issue of the limited amount of *** comparative review with other existing works is also discussed,highlighting a clear difference from the existing *** proposed system is distinctive on the basis of prioritization of vaccines and seamless integration of test certificates and vaccine passports,which will aid in controlling the pandemic *** system will also be handy in the case of tackling any future pandemics initially.

关键词： COVID-19 Blockchain Solidity Digital vaccine passport Vaccination

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Synergistic enhancement of photocatalytic and antimicrobial efficacy of nitrogen and erbium co-doped ZnO nanoparticles

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Journal of Rare Earths 2024年第5期42卷 859-868,I0002页

作者： Sudipta Mondal Moniruzzaman Jamal Sikder Ashikuzzaman Ayon md Jannatul ferdous Anik md Muktadir Billah Department of Materials and Metallurgical Engineering Bangladesh University of Engineering and TechnologyDhaka1000Bangladesh School of Materials Engineering Purdue UniversityWest LafayetteIN47907USA Department of Materials Science and Engineering University of CaliforniaBerkeleyCA94720USA Department of Materials Science and Engineering Northwestern UniversityEvanstonI28USA

Using the chemical co-precipitation approach,a series of nitrogen(N) and erbium(Er) co-doped ZnO nanoparticles(NPs) was effectively synthesized to enhance the photocatalytic and antibacterial *** characterization techniques,including X-ray diffraction(XRD),X-ray photoelectron spectro scopy(XPS),scanning electron microscopy(SEM),UV-vis,and photoluminescence(PL) spectroscopy,were carried out to validate the evaluated photocatalytic and antibacterial *** analysis confirms the pure wurtzite ZnO phase without the presence of any secondary *** analysis confirms the succe ssful incorporation of nitrogen and erbium into the ZnO *** optical bandgap of ZnO calculated from UV-vis spectroscopy shows a redshift after Er-N co-doping,with the lowest bandgap of 3.215 eV calculated for Zn_(0.97)Er_(0.03)N_(0.01)O_(0.99) *** images demonstrate the formation of nanorods after N-Er co-doping,followed by gradually increase d rod diameter and length after N-Er ***,the photocatalytic activities of ZnO samples we re measured by their ability to facilitate the photodegradation of Rhodamine B under UV *** with 1 mol% N doping exhibits 88% photodegradation of RhB under UV light within 360 min,and the photodegradation and antibacterial activity are greatly improved with Er *** fact,3 mol% Er-1 mol% N doped ZnO NPs demonstrate the highest photocatalytic activity,with approximately 96% degradation after 360 min,as well as superior antibacterial activity against Staphylococcus aureus(Gram-positive bacteria) and Pseudomonas aeruginosa(Gram-negative bacteria) with the highest zone of inhibition(ZOI) of 16 nm,due to nanorod formation,increased reactive oxygen species(ROS),and decreased electron-hole recombination,as validated by SEM,XPS,and PL spectroscopy.

关键词： Chemical co-precipitation Co-doping Bandgap Photocatalysis Rare earths Antimicrobial

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Phonon transmission of vacancy disordered armchair silicene nanoribbon

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Optoelectronics Letters 2021年第8期17卷 454-458页

作者： Ashraful Hossain Howlader md.Sherajul Islam Naim ferdous School of Physics The University of SydneyNew South Wales 2006Australia Department of Electrical and Electronic Engineering Khulna University of Engineering and TechnologyKhulna 9203Bangladesh Department of Electrical and Electronic Engineering Bangabandhu Sheikh Mujibur Rahman Science and Technology UniversityGopalganj 8100Bangladesh

This work demonstrates the atomic vacancy effects on the phonon properties of armchair silicene nanoribbon in a step by step process for the first *** phonon localization effect figures out the fact that vacancies cause to high-energy phonons become localized,whereas low-energy phonons can easily *** vacancy reduces high-energy phonon transmission severely compared to low-energy *** is also found from phonon density of states that high-frequency phonons soften towards the low-frequency *** simulated phonon bandstructure verifies that most of the phonon branches transform to a nondegenerate state from a degenerate state and shifted toward a lower frequency regime due to the presence of *** overall consequences of atomic vacancies on the phonon thermal conductance disclose the reality that only a few atomic vacancies result in a vital reduction of phonon thermal *** addition,the entropy of the disordered system is investigated.

关键词： phonon vacancy disordered

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Single polarization photonic crystal fiber filter based on surface plasmon resonance

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Frontiers of Optoelectronics 2019年第2期12卷 157-164页

作者： md. Nazmul HOSSEN md. ferdous Kawsar AHMED md. Abdul KHALEK Sujan CHAKMA Bikash Kumar PAUL Department of Information and Communication Technology(ICT) Mawlana Bhashani Science and Technology University(MBSTU)SantoshTangail 1902Bangladesh Group of Biophotomatix SantoshTangail 1902Bagladesh Department of Software Enineering(SWE) Daffodil International UniversityShukrabadDhaka 1207Bangladesh

In this paper,we propose a photonic crystal fiber(PCF)polarization filter based on surface plasmon resonance(SPR)*** nanowire is used as the active plasmonic *** into silica core becomes coupled to gold nanowire stimulating SPR. It soplits light into two orthogonal(x-polarization and y-polarization)polarization in the second order of surface plasmon *** investigations of the proposed PCF filter is finite element method(FEM).By position,the performance of the propsed PCF filter is inspected *** of any polarization can be obtained by properly placing the metal *** maximum cnfinement loss of x-polarization is 692.25dB/cm and y-polarization is 1.13dB/cm offers at resonance position 1.42μ*** a confinement loss difference between two orthogonal polarizations makes PCF a talented candidate to filter ***,the recommended PCF structure is useful for polarization device.

关键词： photonic crystal fiber (PCF) surface plasmon resonance (SPR) perfectly match layer polarization filter

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Probiotics ameliorate chromium-induced growth retardation and stress in Indian major carp rohu, Labeo rohita

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Emerging Contaminants 2024年第2期10卷 57-64页

作者： Zannatul ferdous S.M.Rafiquzzaman md Shahjahan Laboratory of Fish Ecophysiology Department of Fisheries ManagementBangladesh Agricultural UniversityMymensingh2202Bangladesh Department of Fisheries Biology&Aquatic Environment Bangabandhu Sheikh Mujibur Rahman Agricultural UniversityGazipur1706Bangladesh

Chromium(Cr)is one of the most prominent contaminants due to its cumulative negative effects on *** may be able to mitigate the unfavorable effects of Cr in *** this study,the rohu Labeo rohita(3.02±0.37 g)were exposed to Cr with or without probiotics,representing control(C;without Cr or probiotics),treatment one(T1;Cr at a dose of 4 mg/L),treatment two(T2;probiotics at a dose of 1 ml/L)and treatment three(T3;Cr at a dose of 4 mg/L+probiotics at a dose of 1 ml/L)for 42 *** results showed that weight gain(WG)and specific growth rate(SGR)were inhibited significantly in T1,while those substantially increased in T2(probiotics)compared to *** the other hand,WG and SGR were regained as compared to C in *** significantly lowest feed conversion ratio(FCR)was found in T2,and moderate FCR was recorded in C and T3,while it was significantly highest in *** mortality was observed in C and T2,while 20%mortality was recorded in T1,and decreased mortality was recorded in T3(10%).Exposure to Cr(T1)caused lower hemoglobin and higher glucose levels;however,the use of probiotics reversed these effects in T3(Cr+probiotics).The frequencies of nuclear(notched nuclei,nuclear bridges,and karyopyknosis)and cellular(tear drop shaped,fusion,and twin)abnormalities of erythrocytes increased in the Cr-exposed group(T1);however,these were recovered after probiotic administration(T3).The findings of the present study suggest that probiotics play a beneficial role in reducing the toxicities of Cr in rohu.

关键词： Contaminants Pollution Stress Erythrocytes Hemoglobin Probiotics

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SeqCor:correct the effect of guide RNA sequences in clustered regularly interspaced short palindromic repeats/Cas9 screening by machine learning algorithm

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Journal of Genetics and Genomics 2020年第11期47卷 672-680页

作者： Xiaojian Liu Yuanyuan Yang Yan Qiu md Reyad-ul-ferdous Qiurong Ding Yi Wang CAS Key Laboratory of Nutrition Metabolism and Food SafetyShanghai Institute of Nutrition and HealthShanghai Institutes for Biological SciencesUniversity of Chinese Academy of SciencesChinese Academy of SciencesShanghai 200031China Institute for Stem Cell and Regeneration Chinese Academy of SciencesBeijing 100101China Ministry of Education Key Laboratory of Contemporary Anthropology Department of Anthropology and Human GeneticsSchool of Life SciencesFudan UniversityShanghai 200438China Human Phenome Institute Fudan UniversityShanghai 200438China

Clustered regularly interspaced short palindromic repeats(CRISPR)/Cas9-based screening using various guide RNA(g RNA)libraries has been executed to identify functional components for a wide range of phenotypes with regard to numerous cell types and *** data from public CRISPR/Cas9-based screening experiments,we found that the sequences of g RNAs in the library influence CRISPR/Cas9-based *** building a standard strategy for correcting results of all g RNA libraries is impractical,we developed Seq Cor,an open-source programming bundle that enables researchers to address the result bias potentially triggered by the composition of g RNA sequences via the organization of g RNA in the library used in CRISPR/Cas9-based ***,Seq Cor completely computerizes the extraction of sequence features that may influence single-guide RNA knockout efficiency using a machine learning *** together,we have developed a software program bundle that ought to be beneficial to the CRISPR/Cas9-based screening platform.

关键词： SeqCor CRISPR/Cas9-based screening Machine learning

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Bishop Koop conversion of temporary stoma can be an option to establish gut continuity early when primary anastomosis is not safe

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World Journal of Pediatric Surgery 2019年第2期2卷 16-19页

作者： md Samiul Hasan Ashrarur Rahman Umama Huq Kazi Nur Ul ferdous md Ayub Ali Pediatric Surgery Bangladesh Institute of Child Health(BICH)Dhaka Shishu(Children)HospitalDhakaBangladesh

background Intestinal perforation and sometimes obstruction in neonates demand diverting stomas which are associated with fluid,electrolytes and nutrient *** establishment of gut continuity is the key to the best outcome,though primary anastomosis is not always *** aim of this study was to evaluate the effectiveness of Bishop Koop stoma in establishing early continuity of gut and confirming the function of distal *** Data of patients who underwent Bishop Koop conversion of diverting stoma from July 2016 to June 2018 were reviewed *** and outcome data were recorded and analyzed using Statistical Package for the Social Science(SPSS)V.22 *** permission was taken from hospital ethical *** 29 patients were included(16 male and 13 female).Mean age of conversion was 5.8±2.5 months and mean weight was 4.9±*** bowel movement was established in 26 *** patient died of sepsis on sixth postoperative day and one had anastomotic *** was no significant difference with respect to outcome between perforation and obstruction *** Koop stomas were closed after 6 weeks of *** Bishop Koop conversion of temporary stoma was turned out as a good choice for these patients.

关键词： Bishop continuity establishing

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Multi-species probiotics enhance survival,growth,intestinal microbiota and disease resistance of rohu(Labeo rohita)larvae

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Water Biology and Security 2024年第1期3卷 71-79页

作者： Zannatul ferdous md Kabir Hossain md Hadiuzzaman SMRafiquzzaman KM Abdul Halim Tanvir Rahman md Ali Reza Faruk Zulhisyam Abdul Kari md Shahjahan Laboratory of Fish Ecophysiology Department of Fisheries ManagementBangladesh Agricultural UniversityMymensingh2202Bangladesh Department of Aquaculture Bangladesh Agricultural UniversityMymensingh2202Bangladesh Department of Fisheries Matshoy BhabanDhakaBangladesh Department of Fisheries Biology&Aquatic Environment Bangabandhu Sheikh Mujibur Rahman Agricultural UniversityGazipur1706Bangladesh Department of Agricultural Sciences Faculty of Agro-Based IndustryUniversiti Malaysia KelantanJeli Campus17600JeliKelantanMalaysia

Multi-strain probiotics provide the most dependable approaches to improve health,immune response,and disease resistance in farmed *** the present study,we examined the effects of multi-species probiotics on the survival,growth,immune response,and disease resistance of rohu(Labeo rohita)*** hatched larvae from the day of first feeding(average weight of 0.003 g)were reared with multi-species probiotics having a combination of Bacillus subtilis(109 colony forming units(cfu)/mL)and Lactobacillus spp.(Lactobacillus plantarum,Lactobacillus buchneri-1011 cfu/mL)in water containing doses of 0(control-C),0.5 mL/L(treatment 1-T1),and 1.0 mL/L(treatment 2-T2)in triplicates for 90 *** the experiment,a challenge test was performed to assess the fish's resistance to pathogenic Aeromonas *** higher survival was recorded in larvae of treated groups(87%in T2 and 79%in T1)compared to the control(62%).Significantly higher growth performance(weight gain and specific growth rate—SGR)was shown by the probiotic-treated larval groups compared to the *** supplementation resulted in significantly higher counts of total viable colony(TVC)and lactic acid bacteria(LAB)in the *** immunological parameters(mucosal fold fattening,goblet cell abundance,expansion of lamina propria and enterocytes)of the gut were significantly better in probiotic-treated *** liver of treated fish showed irregular shape nuclei turning into regular shape and reducing spaces between the hepatic ***-treated fish had the highest post-challenge survival rate(90%)against *** *** erythrocytes of challenged fish treated with probiotics had significantly lower frequencies of various nuclear and cellular *** findings suggest that multi-species probiotic supplements could improve the survival,growth,health status,and immune response of rohu in the early stages of its development.

关键词： Aquaculture Disease resistance Immunity Labeo rohita Probiotics

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比伐卢定用于初次PCI病人的临床结局优于普通肝素

比伐卢定用于初次PCI病人的临床结局优于普通肝素

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作者： md MISBAHUL ferdous 山东大学

学位级别：博士

冠心病(CHD)是最常见的死因之一,世界上每年约有700万人死于该病,其中大多数死因是急性心肌梗死(AMI),因此全球范围内急性心梗的疾病负担和死亡率都很高。溶栓和原发性经皮冠状动脉介入术(PCI)是治疗ST段抬高型心肌梗死(STEMI)的主要方... 详细信息

冠心病(CHD)是最常见的死因之一,世界上每年约有700万人死于该病,其中大多数死因是急性心肌梗死(AMI),因此全球范围内急性心梗的疾病负担和死亡率都很高。溶栓和原发性经皮冠状动脉介入术(PCI)是治疗ST段抬高型心肌梗死(STEMI)的主要方案。目的:评估抗栓治疗对于预防急性心肌梗死(AMI)病人在经皮冠状动脉介入术(PCI)术中和术后发生不良出血事件的作用。抗栓药物的临床结局和效果需与其相关的出血并发症发生风险进行权衡对比。本研究旨在比较比伐卢定和普通肝素对行PCI手术的急性心梗患者的抗凝治疗效果,并阐明他们的临床预后意义。比伐卢定是一种直接凝血酶抑制剂(DTI),经常在侵入性心内手术尤其是PCI背景下用于抗凝。比伐卢定具有独特的药理学效用,与其他已知的DTI对比来看,它参与了主要的非器官性消除(蛋白水解),半衰期最短(约25分钟)。它与凝血酶的相似性介于重组水蛭素(最高)和阿加曲班(最低)之间,而这解释了为何它的干扰功能性凝血测定的程度介于其他两种DTI达到的程度之间。PT(INR)对凝血酶的亲和力较高,延长APTT对DTI分子量的要求较低;反过来,APTT延长所需DTI的浓度降低(并且可能是体内效应)导致了PT(INR)缩短不可逆。原发性PCI是急性心梗病人行PCI术的关键性实践步骤,尤其是当他们的心电图提示严重心脏损害的时候。PCI一般用于远期心血管事件发生风险较高的其他形式心梗病人或不稳定型心绞痛病人。冠状动脉旁路移植术(CABG)就是绕过狭窄的动脉形成旁路来进行治疗,而PCI则是除此之外的另一个良选。PCI术主要用于已被堵塞的冠脉再通,恢复心脏血供,因此病人不再需要行心脏直视手术。冠脉狭窄甚至堵塞的患者与恶性心绞痛、心梗和濒死患者类似,PCI对于他们可能是重建血供的最佳选择。目前,PCI频繁让步于支架,比如裸露金属支架、药物洗脱支架和完全可吸收的血管支架。急性心梗的病人可能有一部分适合行PCI术,指南和最优秀的手术操作也在不断地发展。对于严重堵塞的病人比如ST抬高型心肌梗死(STEMI)患者,PCI术可比药物治疗对于提高存活率,减少死亡率、心梗和心绞痛更加关键。在美国的大多数心内介入实验室,比伐卢定主要用于对肝素耐受的病人(肝素诱导的血小板减少综合症病史)进行肝素替代治疗。然而,比伐卢定的临床分析证明其对稳定型心绞痛、不稳定型心绞痛(UA)、非ST段抬高型心肌梗死(NSTEMI)和经PCI术的ST段抬高型心肌梗死病人都有稳定乐观的临床结局。这项治疗也遵从了 ACC/AHA最新指南对于上述提及的所有情况的一级建议。对于急性冠脉综合征(ACS)病人,优先于介入实验室的各项抗凝药物的预处理程度被热烈地讨论。尽管对STEMI病人来说应用抗凝药物预处理可能有明显的临床益处,但问题仍很复杂。预处理可能能够预防远期栓塞形成,影响身体自身的纤溶过程和随后自发的再灌注,同时减少围手术期并发症。然而心电图显示怀疑STMI的病人实际上也可能有着完全正常的冠状血管。他们的症状可能来源于其他的诊断如心包炎、肺栓塞、主动脉夹层、心包填塞等。这些病人若接受抗凝预处理,非但没有任何好处,还可能对身体有害,尤其是需要做抗栓手术的时候。因此预处理变得更加复杂并且需要谨慎考虑。比伐卢定主要用于FDA首次允许的适应症,即经皮冠状动脉腔内成形术("球囊血管成形术")中的抗凝治疗,也是PCI中最常见的类型。对于接受PCI治疗的患有或可能患有肝素诱导型血小板减少症(HIT)或伴有血栓形成(HITTS)的患者,还可以用比伐卢定进行PCI治疗,并提供暂时性糖蛋白Ⅱb/Ⅲa拮抗剂治疗。比伐卢定发展计划使用了一个包含"三重"功效终点加上大量出血的"四重"终点的策略。这一策略预示着将来的重点在于通过减少出血来改善临床结局。除了总结评估比伐卢定对急性冠脉综合征(特别是应用PCI)用途的关键试验,我们还评估了比伐卢定作为抗凝剂在体外和非体外循环心脏手术中的作用,包括HIT和非HIT情况。制剂比伐卢定在大规模多盲试验中已被用于减少大出血事件,与普通肝素比较,它一般用于PCI术后的STEMI患者。然而,与比伐卢定治疗有关的出血减少是以支架内血栓发生率增加为代价的。这些试验中,普通肝素组糖蛋白Ⅱb/Ⅲa抑制剂(GPI)剂量的比例也在变化,从少量到中量再到必须加用。假如GPI治疗与出血增加和缺血减少有关,无论观察到的比伐卢定和普通肝素差异多大,至少在某种程度上比不上普通肝素组更好的GPI治疗。比伐卢定现已被FDA批准作为抗凝剂与阿司匹林合用于经PTCA术后且非紧急性PCI术的不稳定型心绞痛病人。但比伐卢定不影响PCI术后再狭窄率。为了防止围手术期血栓形成,抗凝治疗对于PCI术必不可少。普通肝素(UFH)和后来新型的低分子量肝素(LMWH)是最常见的一组凝血酶抑制剂(DTI),但

关键词：原发性经皮冠状动脉介入术(PCI) 急性心肌梗死(AMI) 普通肝素(UFH) 活化凝血时间(ACT) 比伐卢定

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Identification of Influential Users in Online Social Network: A Brief Overview

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Journal of Computer and Communications 2023年第7期11卷 58-73页

作者： Mahmuda ferdous md. Musfique Anwar Department of Computer Science and Engineering University of Development Alternative Dhaka Bangladesh Department of Computer Science and Engineering Jahangirnagar University Dhaka Bangladesh

Information networks where users join a network, publish their own content, and create links to other users are called Online Social Networks (OSNs). Nowadays, OSNs have become one of the major platforms to promote both new and viral applications as well as disseminate information. Social network analysis is the study of these information networks that leads to uncovering patterns of interaction among the entities. In this regard, finding influential users in OSNs is very important as they play a key role in the success above phenomena. Various approaches exist to detect influential users in OSNs, starting from simply counting the immediate neighbors to more complex machine-learning and message-passing techniques. In this paper, we review the recent existing research works that focused on identifying influential users in OSNs.

关键词： Online Social Network Trending Topics Social Influence Influential User

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