Search results for: Jahedul Islam

Items from 1 to 15 out of 15 results

article

Influence of different codes on the performance of SAC‐OCDMA over FSO link

Nabamita Das, Md. Jahedul Islam

International Journal of Communication Systems > 37 > 6 > n/a - n/a

This paper evaluates the performance of a spectral‐amplitude‐coding optical code division multiple access (SAC‐OCDMA) system over a free space optical (FSO) communication link under various weather conditions such as fog, snow, and rain. The system uses different code families, including modified quadrature congruence (MQC), random diagonal (RD), and diagonal eigenvalue unity (DEU), to address user...

article

Control of Supercritical Organic Rankine Cycle based Waste Heat Recovery System Using Conventional and Fuzzy Self-tuned PID Controllers

Jahedul Islam Chowdhury, David Thornhill, Payam Soulatiantork, Yukun Hu, more

International Journal of Control, Automation and Systems > 2019 > 17 > 11 > 2969-2981

This research develops a supercritical organic Rankine cycle (ORC) based waste heat recovery (WHR) system for control system simulation. In supercritical ORC-WHR systems, the evaporator is a main contributor to the thermal inertia of the system, which is greatly affected by transient heat sources during operation. In order to capture the thermal inertia of the system and reduce the computation time...

article

Reducing industrial energy demand in the UK: A review of energy efficiency technologies and energy saving potential in selected sectors

Jahedul Islam Chowdhury, Yukun Hu, Ismail Haltas, Nazmiye Balta-Ozkan, more

Renewable and Sustainable Energy Reviews > 2018 > 94 > C > 1153-1178

Currently UK industrial and manufacturing sectors are facing dual challenges of contributing to national 80% reduction targets in CO₂ emissions by 2050 (compared to 1990 levels) and improving economic competitiveness in the face of low cost imports. Since energy consumption is the main source of CO₂ emissions and directly related to products being manufactured, improving energy efficiency in energy...

article

Stability of moving gap solitons in linearly coupled Bragg gratings with cubic–quintic nonlinearity

Md. Jahedul Islam, Javid Atai

Nonlinear Dynamics > 2018 > 91 > 4 > 2725-2733

The existence and stability of moving gap solitons in coupled Bragg gratings with cubic–quintic nonlinearity are investigated. It is shown that the model supports two disjoint families of solitons, known as Type 1 and Type 2 solitons, which fill the entire bandgap. There exist symmetric and asymmetric moving gap solitons within each family of solitons. By means of systematic numerical stability analysis,...

article

Dynamic model of supercritical Organic Rankine Cycle waste heat recovery system for internal combustion engine

Jahedul Islam Chowdhury, Bao Kha Nguyen, David Thornhill

International Journal of Automotive Technology > 2017 > 18 > 4 > 589-601

The supercritical Organic Rankine Cycle (ORC) for the Waste Heat Recovery (WHR) from Internal Combustion (IC) engines has been a growing research area in recent years, driven by the aim to enhance the thermal efficiency of the ORC and engine. Simulation of a supercritical ORC-WHR system before a real-time application is important as high pressure in the system may lead to concerns about safety and...

article

Investigation of waste heat recovery system at supercritical conditions with vehicle drive cycles

Jahedul Islam Chowdhury, Bao Kha Nguyen, David Thornhill

Journal of Mechanical Science and Technology > 2017 > 31 > 2 > 923-936

Waste heat recovery (WHR) for internal combustion engines in vehicles using Organic Rankine cycle (ORC) has been a promising technology. The operation of the ORC WHR system in supercritical conditions has a potential to generate more power output and thermal efficiency compared with the conventional subcritical conditions. However, in supercritical conditions, the heat transfer process in the evaporator,...

article

Interaction Dynamics of Gap Solitons in Dual-Core Bragg Gratings With Cubic-Quintic Nonlinearity

Md. Jahedul Islam, Javid Atai

IEEE Journal of Quantum Electronics > 2016 > 52 > 5 > 1 - 8

Interactions between quiescent gap solitons in dual-core Bragg gratings with cubic-quintic nonlinearity are systematically investigated. In a previous work, it was found that the model supports symmetric and asymmetric soliton solutions. For each of these categories, there exist two disjoint families of quiescent gap solitons. One family can be regarded as the generalization of the quiescent gap solitons...

chapter

Microcontroller based self sustaining automatic traffic light control using speed breaker

Tawhida Akand, Sadeka Sultana, Jahedul Islam, Mrinmoy Dey

2015 2nd International Conference on Electrical Information and Communication Technologies (EICT) > 243 - 248

2015 2nd International Conference on Electrical Information and Communication Technologies (EICT)

Present development of the world is measured by the amount of energy consumption. Energy of today world is generated from conventional energy sources mostly which are decreasing day by day. Moreover, these conventional energy sources causes pollution and responsible for global warming of the world. To solve these problems, researchers are trying frequently to explore new sources of energy which are...

chapter

A comparative analysis of the characterization methods for submicron silicon waveguide propagation loss

Mohammad Istiaque Reja, Jobaida Akhtar, Muhammad Nouman Malik, Shamim Ahmed, more

2015 2nd International Conference on Electrical Information and Communication Technologies (EICT) > 347 - 352

2015 2nd International Conference on Electrical Information and Communication Technologies (EICT)

An important parameter in integrated optical device is the propagation loss of the waveguide. Its characterization gives the information of the fabrication quality as well as the information of other passive devices on the chip as it is the basic building block of the passive devices. Although, over the last three decades many methods have been developed, there is not a single standard present yet...

chapter

Moving gap solitons in coupled Bragg gratings with cubic-quintic nonlinearity

Md. Jahedul Islam, Javid Atai

2015 IEEE Photonics Conference (IPC) > 238 - 239

2015 IEEE Photonics Conference (IPC)

The existence and stability of moving gap solitons in coupled Bragg gratings with cubic-quintic nonlinearity are investigated. The effect of quintic nonlinearity and velocity of soliton on the stability of gap solitons are analyzed.

chapter

Interactions of gap solitons in coupled Bragg gratings with cubic-quintic nonlinearity

Md. Jahedul Islam, Javid Atai

2014 IEEE Photonics Conference > 386 - 387

2014 IEEE Photonics Conference (IPC)

We investigate the interactions of quiescent gap solitons in coupled Bragg gratings with cubic-quintic nonlinearity. The dependence of the outcomes of interactions on initial separation and coupling coefficient is discussed.

chapter

Vibration data acquisition and visualization system using MEMS accelerometer

Insan Arafat Jamil, Minhaz Ibna Abedin, Dhiman Kumar Sarker, Jahedul Islam

2014 International Conference on Electrical Engineering and Information & Communication Technology > 1 - 6

2014 International Conference on Electrical Engineering and Information Communication Technology (ICEEICT)

Vibration measurement and its real-time graphical representation is often required for analysis of physical conditions of machines, engines as well as in scientific researches, earth-quake amplitude measurement etc. This project work was intended to develop a system for measurement and real-time visualization of vibration. An electronic accelerometer sensor facilitates the vibration sensing procedure...

article

The BER Performance Improvement of Optical CDMA Using FBG-based Compensator

Jahedul Islam, Rafiqul Islam

Procedia Engineering > 2012 > 30 > Complete > 821-827

An analytical approach is presented to investigate the improvement of bit error rate (BER) performance in direct sequence optical code division multiple access with in-line cascaded optical amplifiers in presence of FBG-based group velocity dispersion (GVD) compensator. Gaussian-shaped optical orthogonal codes are employed as address sequence, and an optical correlator receiver with avalanche photodiode...

chapter

Influence of polarization mode dispersion on the BER performance of DS-OCDMA

Md Jahedul Islam, Md Rafiqul Islam

2010 13th International Conference on Computer and Information Technology (ICCIT) > 148 - 152

13th International Conference on Computer and Information Technology (ICCIT 2010)

In this paper, a theoretical analysis is presented to evaluate the influence of polarization mode dispersion (PMD) on the bit error rate (BER) performance of direct sequence optical code division multiple access system. In this analysis, intensity modulation direct detection technique is employed in single mode fiber operating at 1550nm, and optical orthogonal codes are used as address sequence. Optoelectronic...

chapter

Impact of chipshape on the performance of DS-OCDMA in dispersive fiber medium

Md Jahedul Islam, Md Rafiqul Islam, S P Majumder

International Conference on Electrical&Computer Engineering (ICECE 2010) > 33 - 36

2010 6th International Conference on Electrical & Computer Engineering (ICECE 2010)

Chipshape-dependent bit error rate (BER) performance of direct sequence optical code division multiple access is analytically studied in fiber optic communication with cascaded in-line optical amplifiers in presence of group velocity dispersion. In our analysis, supper-Gaussian, and Hyperbolic-Secant shaped optical orthogonal codes are employed as address sequence. Avalanche photodiode is used in...

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