AIUB Journal of Science and Engineering (AJSE)最新文献_第10页

A Comprehensive Study on the Impact of Various Nano-gratings on MSM-PDs for Enhancement in the Light Absorption 各种纳米光栅对msm - pd增强光吸收影响的综合研究

AIUB Journal of Science and Engineering (AJSE) Pub Date : 2019-05-31 DOI: 10.53799/ajse.v18i1.19

Alif Islam, N. Das, Mohammad M. Uzzal

{"title":"A Comprehensive Study on the Impact of Various Nano-gratings on MSM-PDs for Enhancement in the Light Absorption","authors":"Alif Islam, N. Das, Mohammad M. Uzzal","doi":"10.53799/ajse.v18i1.19","DOIUrl":"https://doi.org/10.53799/ajse.v18i1.19","url":null,"abstract":"In this paper, we have analyzed metal-semiconductor-metal photodetectors (MSM-PDs) with different nano-grating structures or shapes to improve the light absorption capacity into the device in details for high-speed communication systems and networks. The plasmonic-based MSM-PD structure demonstrates a significant improvement in light absorption capacity for the developed device compared to conventional MSM-PDs i.e., devices that have not employed the nano-gratings. The light absorption capacity of the device is varied with the variation of geometrical shapes and parameters of the nano-gratings, such as the nano-grating height, slit width and so on. These nano-grating structures are assisting in light transmission through the central slit (i.e., subwavelength apertures) efficiently, resulting in the excitation of surface plasmon polaritons (SPPs) as the incident photons interact with the nano-gratings/ nano-corrugations. This improved light transmission in the central slit along with excited SPPs results in resonant light absorption in the device. This means the light trapped inside the central slit is triggered by the SPPs to a higher order magnitude. This causes the light absorption enhancement for the device, i.e., more light is transmitted through the device instead of reflecting back to the surface. The simulation results demonstrated that the light absorption enhancement factor (LAEF) for these devices have improved dramatically due to the nano-gratings. For modeling and simulation of these devices, Opti-FDTD tool is used which is based on finite difference time domain (FDTD) method. The application of these simulated devices is in the range of 800-850-nm. The simulation results are suitable for the design of nano-structured MSM-PDs that can be used in high-speed communication systems and sensor network systems.","PeriodicalId":224436,"journal":{"name":"AIUB Journal of Science and Engineering (AJSE)","volume":"44 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-05-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130029162","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 1

OCDMA System Using Two Code Keying Encryption Introducing a SOA Based CMUX And CDEMUX Over a WDM System 基于双码密钥加密的OCDMA系统介绍了基于SOA的WDM系统CMUX和CDEMUX

AIUB Journal of Science and Engineering (AJSE) Pub Date : 2019-05-31 DOI: 10.53799/ajse.v18i1.17

Tasnuva Chowdhury, Mohammad Nasir Uddin

引用次数: 0

Performance Evaluation of Meander Line Implantable Antenna integrated with EBG Based Ground for Anatomical Realistic Model 结合EBG地基的弯曲线植入天线解剖逼真模型性能评价

AIUB Journal of Science and Engineering (AJSE) Pub Date : 2019-05-31 DOI: 10.53799/ajse.v18i1.16

Sadia Sultana, R. Basak

{"title":"Performance Evaluation of Meander Line Implantable Antenna integrated with EBG Based Ground for Anatomical Realistic Model","authors":"Sadia Sultana, R. Basak","doi":"10.53799/ajse.v18i1.16","DOIUrl":"https://doi.org/10.53799/ajse.v18i1.16","url":null,"abstract":"A unique design and meander line implantable antenna is examined in this paper which satisfies the requirements of ultra-wide band. The designed antenna is integrated with the electromagnetic band gap (EBG) structure based ground plane to enhance the performance. Rectangular electromagnetic band gap (EBG) structures are represented here to evaluate the antenna performance. This compact and efficient MLA antenna is applied to improve the antenna performance for numerous implantable scenarios and biomedical applications. The proposed antenna with EGB ground plane is designed for both the simplified model and anatomical realistic models for the human body and executed the performance in bio-environment. To approve the results of implantable antennas more correctly, simulation is analyzed using anatomical realistic human models. The ultimate design has the whole dimension is 15.2 x 8.8 m2. The thickness of the antenna is about 0.8 mm. FR4 is chosen as the substrate material and Copper is chosen as the patch material. The antenna is enclosed biocompatible material with silicon inside the tissue in order to protect patient safety. Significant parameters such as S11 parameter, Far field (radiation pattern), VSWR, Efficiency, Directivity, Gain of the proposed antenna have calculated and measured the performance both the simplified and realistic human models. Comparison Analysis of S11 parameter for different substrate materials and patch materials have observed. The radiation mechanism and modified design of the implantable antenna reducing Specific Absorption Rate (SAR) for safety issues. All the simulation results and measurements are obtained from CST Microwave Studio to validate the design.","PeriodicalId":224436,"journal":{"name":"AIUB Journal of Science and Engineering (AJSE)","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-05-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116679262","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

A Novel Design and Performance Analysis of an ISM Band Antenna for Biomedical Applications 生物医学用ISM波段天线的新设计与性能分析

AIUB Journal of Science and Engineering (AJSE) Pub Date : 2018-11-30 DOI: 10.53799/ajse.v17i3.12

A. A. Faruk, R. Basak

{"title":"A Novel Design and Performance Analysis of an ISM Band Antenna for Biomedical Applications","authors":"A. A. Faruk, R. Basak","doi":"10.53799/ajse.v17i3.12","DOIUrl":"https://doi.org/10.53799/ajse.v17i3.12","url":null,"abstract":"Biomedical application is an advancing sector of research work which permits the development of a transmission link from a living body to an extrinsic device. A microstrip patch antenna is proposed in this paper for biomedical applications. The antenna is designed to operate in the Industrial, Scientific and Medical (ISM) band (2.4 – 2.4835 GHz). The thickness of the antenna is only 2.3 mm which implies that the antenna is reliable to operate under bent conditions. The dimension of the proposed antenna is 28.5 mm x 28.5 mm x 2.3 mm. In this antenna, Copper is used as the patch material and FR-4 is used as the substrate material. Three-layer human tissue model is used to analysis the performance of the antenna. Computer Simulation Technology (CST) software is used to designed the antenna and analysis the performance parameter of the antenna such as the return loss (S11 parameter), radiation pattern, operating frequency, directivity, gain, total efficiency under normal and bent conditions on the human tissue model. Performance analysis is also observed for different substrate material, different patch material, and different types of human tissues and comparison analysis of S11 parameter for the planar and bent condition. Among all of the substrate materials, FR4 provides the good antenna performance. Finally, Specific Absorption Rate (SAR) and thermal loss are evaluated to comply with the antenna safety issues.","PeriodicalId":224436,"journal":{"name":"AIUB Journal of Science and Engineering (AJSE)","volume":"42 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-11-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123083645","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Performance Analysis of Modulation Response of a Designed 1550 nm Oxide Confined Vertical Cavity Surface Emitting Laser 设计的1550 nm氧化物受限垂直腔面发射激光器调制响应性能分析

AIUB Journal of Science and Engineering (AJSE) Pub Date : 2018-11-30 DOI: 10.53799/ajse.v17i3.13

Md. Sajid Hossain, Dewan Mohammed Abdul Ahad

引用次数: 0

Comparative Study of Thyristor vs IGBT Based AC-DC Power Converter 基于晶闸管与IGBT的交直流功率变换器的比较研究

AIUB Journal of Science and Engineering (AJSE) Pub Date : 2018-11-30 DOI: 10.53799/ajse.v17i3.14

Md. Saiful Islam, Md. Rifat-Ul-Karim Shovon, Abdul Goffar Khan

引用次数: 0

Feasibility Study of Off-Grid Sustainable Energy System for Coastal Bhasan Char to Rehabilitate Rohinga Refugees 沿海巴桑查尔离网可持续能源系统帮助罗兴亚难民康复的可行性研究

AIUB Journal of Science and Engineering (AJSE) Pub Date : 2018-11-30 DOI: 10.53799/ajse.v17i3.11

S. Azim, Mohammad M. Uzzal, A. M. Saleque, A. Rahman

{"title":"Feasibility Study of Off-Grid Sustainable Energy System for Coastal Bhasan Char to Rehabilitate Rohinga Refugees","authors":"S. Azim, Mohammad M. Uzzal, A. M. Saleque, A. Rahman","doi":"10.53799/ajse.v17i3.11","DOIUrl":"https://doi.org/10.53799/ajse.v17i3.11","url":null,"abstract":"Government of Bangladesh (GoB) is implementing an emergency humanitarian project at coastal island Bhasan Char under Hatiya of Noakhali District, from September 2017 to temporarily rehabilitate a portion of incoming Rohinga refugees before they can repatriate to their home land, Myanmar. Under this project, GoB will carry out land development, construction of embankment as well as other infrastructures. This study is aimed at providing partial basic energy support to the government’s initiative of rehabilitating 103,200 Rohinga refugees. Under the study, we check the feasibility of establishing off-grid sustainable energy system. We also perform the financial analysis of the proposed energy system by considering 20 years life-span of the project. Our study shows that annual average solar insolation in Bhasan char is 4.82kWh/m2/day and daily bright sunshine hour varies from 3 hours to 11 hours. Wind flow data of Bhasan char shows the average annual wind speed of 3.74m/s which is available round the clock and throughout the year. These data justify the suitability of environment friendly off-grid solar energy system as well as wind energy system for Bhasan Char. However, considering the effective generation hours, to diversify energy sources and basing on analysis result using HOMER (Hybrid Optimization of Multiple Energy Resources) software – we are proposing a hybrid energy system with 40% contribution from wind and rest 60% from solar. Our financial analysis of the project shows a total cost of 43.848 Crore (USD 0.525 Crore) over 20-year life span. Therefore, a BDT 2.192 Crore/year is quite economical and justifiable, considering the long-term impact that it might provide to displaced 103,200 refugees as well as the solution that we are providing to adverse negative socio-economic impact on Bangladesh from Rohinga issue.","PeriodicalId":224436,"journal":{"name":"AIUB Journal of Science and Engineering (AJSE)","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-11-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115442054","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 6

Optimum charging scheme of Electric Vehicle (EV) battery 电动汽车电池最优充电方案

AIUB Journal of Science and Engineering (AJSE) Pub Date : 2018-11-30 DOI: 10.53799/ajse.v17i3.15

A. Fattah, Abdul Goffar Khan

引用次数: 3

Planning for Blue Economy: Prospects of Maritime Spatial Planning in Bangladesh 蓝色经济规划:孟加拉国海洋空间规划前景

AIUB Journal of Science and Engineering (AJSE) Pub Date : 2018-07-31 DOI: 10.53799/ajse.v17i2.10

Kawshik Saha, A. Alam

{"title":"Planning for Blue Economy: Prospects of Maritime Spatial Planning in Bangladesh","authors":"Kawshik Saha, A. Alam","doi":"10.53799/ajse.v17i2.10","DOIUrl":"https://doi.org/10.53799/ajse.v17i2.10","url":null,"abstract":"Over the years, there has been a growing concern to adopt new strategies for sustainable marine resource management. Coastal countries are implementing new policies, methods and plans to develop long term vision and secure financial investments for their coastal and marine spaces. Recently maritime spatial planning (MSP) is gaining attention as a new approach to sustainable marine resource management by integrating economic, environmental and social concerns is same management platform. In many countries, MSP has been proved as an effective tool to implement ecosystem based approach of planning to achieve long term maritime vision. Bangladesh, with growing economic interest on coastal and marine resources, is looking to adopt best strategies for achieving blue economy goals. However, degrading ocean health due to anthropogenic pressure and impact of climate change are major challenges that need to be faced. This paper explores implication of Maritime Spatial Planning for ocean resource management to achieve blue economy goals and overcome future environmental constraints as well. The authors aim to introduce maritime spatial planning (MSP) as potential tool for sustainable marine resource management to wide range of researchers, professionals working with coastal and marine issues in Bangladesh to encourage further research and exploration.","PeriodicalId":224436,"journal":{"name":"AIUB Journal of Science and Engineering (AJSE)","volume":"15 11 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-07-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125762895","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 2

Adaptive Fitts for Adaptive Interface 适配适配界面

AIUB Journal of Science and Engineering (AJSE) Pub Date : 2018-07-31 DOI: 10.53799/ajse.v17i2.9

Sajib Hasan

引用次数: 0