Chittagong University of Engineering & Technology

About: Chittagong University of Engineering & Technology is a education organization based out in Chittagong, Bangladesh. It is known for research contribution in the topics: Renewable energy & Dielectric. The organization has 1200 authors who have published 1444 publications receiving 10418 citations. The organization is also known as: Engineering College, Chittagong & Bangladesh Institute of Technology, Chittagong.

Designing a Wireless Sensor Network Using Smartphone as Data Source

Abstract: This paper sheds light on the possibility, scope and benefits of using 'Smartphones' as 'sensor nodes' in a 'Wireless Sensor Network' (WSN). Now-a-days, every smart phone has been integrated with different types of sensors & are consolidating with more and more sensors as they advance. Currently, smart phones have sensors to detect humidity, atmospheric pressure, temperature, accelerometer, gyroscope & so on. So the device can be maneuvered in WSN as a provenance of data, since smart phone users are scattered in everywhere. The sensing technology can be manipulated to collect data which are amalgamated in a smartphone. Any information that is convenient can be sent to the server by the user which can be further utilized for public interest. This information can be derived either from the sensor on the phone or from internet. Besides, users can lavish any worthwhile information deliberately. Usually, the sensors in an area are prodigious in number due to the gigantic smart phone users and for that reason, if one phone is down, there is always a second one to vouchsafe the statutory data. Thus, the main hindrances on the resources of WSN (such as energy, memory, computational speed and communications bandwidth) can be annihilated by our proposal as smartphone possesses high speed processor, long life rechargeable battery and high speed data communication system.

Optimization of Lead Sulfide (PbS) Solar Cell

Abstract: Renewable energy is known as the clean and green energy. Solar energy is one of those in this modern era. Lead Sulfide (PbS) is one of the most suitable semiconductor materials which absorption coefficient is high. It has the most favorable band gap energy and highly stable along with low cost material. Consequently the investigators have great deliberation to observe the ultra-thin PbS solar cell. The optimization of PbS ultra-thin solar cell has been done at 600 nm thickness of PbS absorber and window layer ZnO has also been done at 50 nm thickness. It is shown that the ultra-thin PbS solar cell has given efficiency of 19.40% $(J_{sc}=28.41\mathrm{mAcm}^{-2}, V_{oc}=0.80$ V and $\mathrm{FF}=0.85$ ). Hence, it has been investigated the thermal stability of the PbS solar cell. When the temperature is increased from 20°C to 120°C, the TC of the optimization structure is being found at −0.011 %/°C.

Design and Characterization of Miniaturized Implantable PIFA Antenna for MICS Band Application

Abstract: This study concerns with the miniaturization of a microstrip patch antenna using several miniaturization techniques for the application in biotelemetry at the Medical Implant Communication Service (MICS) (402–405 MHz) band. The primary intention is to be able to use this radiating structure as a means of wireless communication and power transmission to a pacemaker system. The optimized structure has dimensions of 12.8x12.8x0.8mm3 and a measured operating frequency of 403 MHz with a bandwidth of 10 MHz observed at return loss of -10dB. The proposed antenna volume is 0.217% of equivalent rectangular patch which resonates at 403MHz. In addition, the measured Specific Absorption Rate (SAR) using a phantom model was 1.38 w/kg for 4mW of excitation power delivered to the structure. The design parameters were evaluated on a substrate of FR-4 using the simulation software CST Studio Suit.

Design and fabrication of a prototype submarine using Archimedes principle

Abstract: A submarine is a clandestine platform of watercraft for independent operation beneath water. In order to surpass under water she must obey some ground laws specially Archimedes principle with taking consideration of its flexible and economic structure and propulsion systems design. The main purpose of this research is to design and fabricate a prototype submarine to make experimentally available. The need for economic innovative design to ensure smart structure, propulsion, diving system and efficient power system has focused in the implemented prototype. The propulsion and power systems are provided by motor and battery. Depth rating comparison with other resplendent submarine makes the prototype unique in some cases. To submerge hydrostatically this research on designing basically implies Archimedes principle and buoyancy force, where negative buoyancy exerted either by increasing its own weight or decreasing its displacement of water.