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A New Algorithm for a Condenser Design for Large-Scale Nuclear Power Plants in Tropical Region

Journal of Thermal Science 2020年第5期29卷 1370-1389页

作者： KHAN Abid Hossain ISLAM md.Shafiqul Department of Industrial and Production Engineering Jashore University of Science and TechnologyJashore 7408Bangladesh Department of Nuclear Engineering University of DhakaDhaka 1000Bangladesh

This work presents a new velocity search algorithm for designing a condenser of a 1200 MWe large-scale nuclear power plant situated in tropical *** this,the condenser pressure was considered in the range of 7.5-15 kPa while its tube inner diameter was taken as 28 mm with 1 mm tube wall *** longitudinal and transverse condensers with multiple shell tanks and varied shell tank lengths from 8-14 m have been considered in this *** different tertiary coolant temperature rises were chosen as 4°C,8°C and 12°C by considering tropical region average reservoir water temperature range of 28°C to 32°C during *** of tertiary coolant was kept within 0.75-1.5 m/s to ensure sufficient turbulence to avoid erosion-corrosion of the *** simulation has been employed to obtain tube-side pressure drop and convection heat transfer coefficient directly from tertiary coolant inlet velocity using κ-ω turbulent flow model.A new iterative“Velocity-search algorithm”has been developed that focuses on finding the correct tertiary coolant velocity instead of overall heat transfer *** revealed that velocity-search algorithm yielded very close to the important physical and thermal parameters of condenser compared to the existing design data in large scale nuclear power ***-search algorithm has given less number of condenser design physical parameters that meets the velocity acceptance criteria for longitudinal condenser compared to the transverse ***,velocity-search algorithm is found to be more reliable,robust,and consistent for condenser design compared to the conventional design algorithm used in Log-Mean Temperature Difference method.

关键词： nuclear power plant vacuum condenser velocity-search algorithm tropical region

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The Electrochemical Oxidation And Analytical Application Of Cholesterol

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Chinese Chemical Letters 1997年第9期8卷 797-800页

作者： Guo, md Feng, BD SHANXI NORMAL UNIV DEPT CHEMLINFEN 041004PEOPLES R CHINA

Cholesterol could be adsorbed on the surface of hanging mercury drop electrode, and gave a sensitive 2.5 order oxidative peak by anodic stripping procedure. The peak potential is -0.01v (Vs SEC). The peak current is linearly proportional to the cholesterol concentration in the range of 1.0x10(-5)similar to 1.0x10(-7)mol/L. The dection limit is 5.0x10(-8) mol/L. In this paper, The electrode response mechanism of cholesterol has been studied, and the optimum experimental conditions have been found. This new method for determination of cholesterol has been applied to actual samples.

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Stroke Prevention in Atrial Fibrillation:Current Strategies and Recommendations

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Cardiovascular Innovations and Applications 2016年第B2期1卷 157-164页

作者： Gerald V.Naccarelli,md Gregory Caputo,md Thomas Abendroth,md Samuel Faber,md Mauricio Sendra-Ferrer,md Deborah Wolbrette,md Soraya Samii,md,phd Sarah Hussain,md Mario Gonzalez,md Penn State Hershey Heart and Vascular Institute Cardiac Electrophysiology ProgramHersheyPAUSA Penn State University College of Medicine HersheyPAUSA

Stroke is the most common complication of atrial fibrillation(AF).Guidelines recommend anticoagulant treatment in patients with CHA2DS2VASc scores of>*** data suggests that almost half of patients who should be on therapeutic anticoagulation for stroke prevention in AF(SPAF)are *** and more recently developed agents,the"novel anticoagulants"(NOACs)reduce the risk of embolic *** addition,the NOACs also reduce intracranial hemorrhage(ICH)by over 50% compared to *** and bridging strategies involving cardioversion,catheter ablation,and invasive/surgical procedures are *** development of reversal agents for NOACs and the introduction of left atrial appendage occluding devices will evolve the use of newer strategies for preventing stroke in high risk AF patients.

关键词： atrial fibrillation stroke anticoagulants

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JIPB in 2010-A More Reader-Friendly International Journal

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Journal of Integrative Plant Biology 2010年第1期52卷 2-3页

作者： Chun-Ming Liu, phd Editor-in-Chief, JIPB 机构不详

Online publication and online reading are gradually becoming routine for scientists and students. Most researchers now follow the scientific development in their expertise area through PubMed, Google Scholar, E-alert and Faculty 1000, etc. This in turn will bring changes to the way of scientific publishing. In JIPB＇s case, we have seen a sharp increase of the number of downloads and online subscriptions during the last couple of years, compared to a rather stable hardcopy subscription rate for the same period.

关键词： Reader In 2010 JIPB in 2010-A More Reader-Friendly International Journal

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Growth performance of Avicennia officinalis L. and the effect of spacing on growth and yield of trees planted in the Western coastal belt of Bangladesh

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Journal of Forestry Research 2014年第4期25卷 835-838页

作者： md. Abdul Quddus Miah Sk. Ahiul Islam md. Ahsan Habib md. Golam Moula Plantation Trial Unit Division Bangladesh Forest Research Institute Rupatoli Barisal-8206 Bangladesh

A trial ofAvicennia officinalis L. with five different spacings was conducted in the newly accreted lands along the western coastline （Patuakhali district） of Bangladesh since 1993 to assess growth perform- ance and the effect of spacing on tree growth. Data on tree density, height, diameter, bole height, crown diameter were recorded and ana- lyzed when the stand was 19 years old. Mean height ranged from 12.89-13.52 m and diameter at breast height （dbh） from 26.57-32.16 cm in plots of different spacings. The mean annual height increment ranged from 0,67-0.71 m, mean annual diameter increment from 1.40-1.69 cm and wood volume from 6.02-10.04 ***＇*** in different treatments. Significantly greater diameter （32.16 cm） and wood volume （10.04 ***.a-1） were obtained with wider （2.13 m × 2.13 m） spacing than with closer spacings. But tree growth was unaffected by other spacings. Growth data were also recorded from other .4. officinalis plantations raised by Forest Department （FD） on different islands in Patuakhali and Bhola districts of Bangladesh. At these sites, mean annual height incre- ment ranged from 0.33-0.62 m, mean annual diameter increment from 0.72-1,37 cm and wood volume from 1.55-5.73 m3·ha-1·a·-1. The growth performance of A. offindicated that the newly aecreted lands along the western shoreline may be suitable for raising Avicennia planta- tions for the enrichment of coastal vegetation.

关键词： growth Avicennia officinalis plantation spacing coastal belt

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Unsupervised method of clustering and labeling of the online product based on reviews

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International Journal of Modeling, Simulation, and Scientific Computing 2021年第2期12卷 175-197页

作者： md Masum Billah Mohammad Nuruzzaman Bhuiyan md.Akterujjaman Computer Science American International University Bangladesh(AIUB)Dhaka-1229 Bangladesh Institute of Information Technology Noakhali Science and Technology University Noakhali-3814 Bangladesh Software Engineering Daffodil International UniversityDhaka-1207Bangladesh

This paper presents an unsupervised approach to cluster reviews of products collected from Amazon and then generates its labels of each *** of using a complete review,this paper splits a review into sentences and considers all sentences from the reviews as inputs for *** Agglomerative Clustering(HAC)is used to cluster *** approaches of cluster labeling are also *** labeling,three different methods have been used to find a limited number of essential words for each *** essential words are used to construct *** phrases are used as labels for each *** paper compares the result of the labeling method with baseline *** the result evaluation,all the labeling methods outperform the baseline *** aim of this research is cluster labeling that makes a set of labels to describe a cluster content and distinguishes the labels from other cluster labels.

关键词： Cluster labeling construct phrases baseline method sentence clustering

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Insights into the physical properties and anisotropic nature of ErPdBi with an appearance of low minimum thermal conductivity

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Chinese Physics B 2021年第1期30卷 398-406页

作者： S K Mitro R Majumder K M Hossain md Zahid Hasan md Emran Hossain M A Hadi Bangamata Sheikh Fojilatunnesa Mujib Science and Technology University Jamalpur-2012Bangladesh Physics Discipline Khulna UniversityKhulna-9208Bangladesh Department of Materials Science and Engineering University of RajshahiRajshahi-6205Bangladesh Department of Electrical and Electronic Engineering International Islamic University ChittagongKumiraChittagong-4318Bangladesh Department of Physics University of RajshahiRajshahi6205Bangladesh

We theoretically study the structural, elastic and optical properties of Er Pd Bi together with its anisotropic behaviors using density functional theory. It is observed that Er Pd Bi satisfies the Born stability criteria nicely and possesses high quality of machinability. The anisotropic behavior of Er Pd Bi is reported with the help of theoretical anisotropy indices incorporating 3 D graphical presentation, which suggests that Er Pd Bi is highly anisotropic in nature. It is noticed that the minimum thermal conductivity is very low for Er Pd Bi compared to the several species. This low value of minimum thermal conductivity introduces the potentiality of Er Pd Bi in high-temperature applications such as thermal barrier *** addition, deep optical insights of Er Pd Bi reveal that our material can be used in different optoelectronic and electronic device applications ranging from organic light-emitting diodes, solar panel efficiency, waveguides etc. to integration of integrated circuits. Therefore, we believe that our results will provide a new insight into high-temperature applications and will benefit for the development of promising optoelectric devices as well.

关键词： Er Pd Bi minimum thermal conductivity anisotropy density functional theory(DFT)

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Anisotropic leaky-like perturbation with subwavelength gratings enables zero crosstalk

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Light(Science & Applications) 2023年第6期12卷 1153-1161页

作者： md Faiyaz Kabir md Borhan Mia Ishtiaque Ahmed Nafiz Jaidye Syed Z.Ahmed Sangsik Kim Department of Electrical and Computer Engineering Texas Tech UniversityLubbockTX 79409USA Department of Physics and Astronomy Texas Tech UniversityLubbockTX 79409USA School of Electrical Engineering Korea Advanced Institute of Science and TechnologyDaejeon 34141South Korea

Electromagnetic coupling via an evanescent field or radiative wave is a primary characteristic of light,allowing optical signal/power transfer in a photonic circuit but limiting integration density.A leaky mode,which combines both evanescent field and radiative wave,causes stronger coupling and is thus considered not ideal for dense *** we show that a leaky oscillation with anisotropic perturbation rather can achieve completely zero crosstalk realized by subwavelength grating(SWG)*** oscillating fields in the SWGs enable coupling coefficients in each direction to counteract each other,resulting in completely zero *** experimentally demonstrate such an extraordinarily low coupling between closely spaced identical leaky SWG waveguides,suppressing the crosstalk by≈40 dB compared to conventional strip waveguides,corresponding to≈100 times longer coupling *** leaky-SWG suppresses the crosstalk of transverse–magnetic(TM)mode,which is challenging due to its low confinement,and marks a novel approach in electromagnetic coupling applicable to other spectral regimes and generic devices.

关键词： crosstalk coupling enable

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Leveraging Sharding-Based Hybrid Consensus for Blockchain

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Computers, Materials & Continua 2024年第10期81卷 1215-1233页

作者： Hind Baageel md Mahfuzur Rahman Department of Information&Computer Science King Fahd University of Petroleum&MineralsDhahran31261Saudi Arabia Interdisciplinary Research Center(IRC)for Intelligent Secure Systems King Fahd University of Petroleum&MineralsDhahran31261Saudi Arabia

The advent of blockchain technology has transformed traditional methods of information exchange,shifting reliance from centralized data centers to decentralized *** blockchain’s decentralization and security are strengths,traditional consensus mechanisms like Proof of Work(PoW)and Proof of Stake(PoS)face limitations in *** achieves decentralization and security but struggles with scalability as transaction volumes grow,while PoS enhances scalability,but risks centralization due to monopolization by high-stake ***,a recent advancement in blockchain technology,addresses scalability by partitioning the network into shards that process transactions independently,thereby improving throughput and reducing ***,cross-shard communication,essential for transactions involving multiple shards,introduces challenges in coordination and fault *** research introduces a shard-based hybrid consensus model,PoSW,which combines PoW and PoS to mitigate the limitations of both *** integrating PoW’s fairness with PoS’s scalability in a shard-based blockchain,the proposed model addresses key issues of scalability and *** evaluate the model against state-of-the-art consensus algorithms,including Monoxide and Practical Byzantine Fault Tolerance(PBFT).The results show that the proposed PoSW model reduces communication overhead compared to PBFT and improves resource utilization over *** addition to performance gains,the security analysis demonstrates that the PoSW model provides robust defense against common blockchain attacks such as the 51%and Sybil attacks,*** proposed approach is particularly suited for applications like decentralized finance(DeFi)and supply chain management,which require both high scalability and robust *** contributions of this research include the development of the PoSW hybrid consensus mechanism,its comparative evaluation with leading algorithms,and a thorough

关键词： Blockchain consensus algorithm decentralized network

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A frequency domain design of PID controller for an AVR system

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Journal of Zhejiang University-Science C(Computers and Electronics) 2014年第4期15卷 293-299页

作者： md Nishat ANWAR Somnath PAN Department of Electrical Engineering Indian School of Mines

We propose a new proportional-integral-derivative(PID) controller design method for an automatic voltage regulation(AVR) system based on approximate model matching in the frequency domain. The parameters of the PID controller are obtained by approximate frequency response matching between the closed-loop control system and a reference model with the desired specifications. Two low frequency points are required for matching the frequency response, and the design method yields linear algebraic equations, solution of which gives the controller parameters. The effectiveness of the proposed method is demonstrated through examples taken from the literature and comparison with some popular methods.

关键词： Automatic voltage regulation(AVR) PID controller Frequency response matching

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