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This paper details how high-voltage pulsed discharge was generated in water with different types of bubbling gases as well as no gas in a reactor with a point-mesh electrode configuration. Acid orange 7 organic dye solution was treated as wastewater sample to elucidate chemical efficiency of bubbling gas types in discharge reactor. Experimental results showed that, oxygen bubbling gas effectively...
Monoplegia is a paralysis of a single limb; usually an arm and patients having monoplegia usually cannot regain their full-potential. Physical therapy is most beneficial for the treatment of monoplegia. However, this physical therapy includes monotonous exercises which seems dull to the patient. Computer assisted technology may be used to assist the patient for doing the physical exercises more effectively...
We consider the problem of secure wireless multicasting through multiple-input multiple-output (MIMO) radio system in which two co-existing users communicate with two groups of receivers in the presence of multiple eavesdroppers. At first, we calculate the secrecy multicast capacity of each group and investigate the impact of interferences on it. Then, we use zero-forcing (ZF) precoding at a relay...
In autonomous robot navigation system, integration of visual sensing sensor plays a vital role. In this paper a vision based differential drive object follower robot has been presented. The robot has been designed to work without any prior environmental information and without any GPS service. The object to be followed and position of the object is determined by processing a real time image feed by...
The present work is the focused on steady Magneto hydrodynamics (MHD) free convection boundary layer flow of an incompressible electrically conducting fluid through a porous medium over a semi-infinite vertical plate in a rotating system with heat generation and the effects of Hall current are taken into account. The governing boundary layer equations are transformed into a set of non-linear ordinary...
The HVDC (high voltage DC) transmission becomes a popular means of power transfer in complex electrical power system network. The use of semiconductor switching device makes the operation of the HVDC system stable and reliable. The determination of proper control topology of the converter and inverter plays the most significant role for uninterrupted operation of the system. The selection of conduction...
The surface of titanium substrate with calcium phosphate (CaP) coating prepared by RF magnetron sputtering was treated by a pulsed electron beam with an energy density of 0.8–8 J/cm2. A partial or complete intermixing of the surface layers of the system CaP-titanium was observed. Significant changes in the topography of the formed surfaces were revealed. Treatment conditions with an energy density...
In this paper, we propose a smart phone operated robotic system that enables the user to send command to the mobile phone attached to the robot through mobile DTMF signal. It collects sensing data, sound, images and video scenarios from the surroundings using 3G video mobile communication. The DTMF signal is processed by Arduino with the aid of a decoder IC. Thereafter, the signal is transmitted to...
Globally, over 1.2 billion people do not have access to electricity and over 1.8 billion people depend on biomass as fuel for cooking in traditional stoves. While new policies are being developed, South Asia and Sub-Saharan Africa will continue to have highest number of under-served population in 2030 unless appropriate institutional, financial and technical models are adopted to increase the access...
This paper presents a transformer-less grid-tie hybrid photovoltaic and wind energy system. The proposed hybrid system consists of a wind turbine, a Permanent Magnet Synchronous Machine (PMSM), a three phase diode bridge rectifier, an wind-side converter, Photovoltaic (PV) array, a dc-dc converter, a grid interface inverter and a T-LCL filter. The power extracted from hybrid wind-solar power system...
The effect of Mg addition on the change in microstructure and indentation hardness of as-cast Al-4.5 mass% Cu-3.4 mass% Fe in-situ composite was investigated. Test specimens were produced by keeping the percentage of iron, copper and aluminium constant and varying the mass% of Mg (1.5%, 2.5%, 3.5% and 4.0%). The composite was produced by solidification processing by means of which Al3Fe intermetallic...
Most of the robotic arm is controlled by using accelerometer sensor with an artificial intelligent algorithm. This paper is proposed a gesture recognition based 6DOF robotic arm controller using gyro-meter with accelerometer to improve the stability and to detect the rotational gesture of human arm. The arm also has the capability to grab object. To find out the angular position of an object, it is...
This paper designed a power management chip which was applied to passive methanol fuel cell. This chip takes 1×/1.33×/1.5×/2× adaptive charge pump module as the core module. It efficiently changes the unstable output voltage of passive methanol fuel cells into a constant output voltage. The largest output current of this chip reaches up to 150mA, and have a small static current. This chip is working...
A wind turbine is a device that converts kinetic energy from the wind into electrical power. Vertical Axis Wind Turbine (VAWT) is one type of wind turbine where the main rotor shaft is set vertically and it can capture wind from any direction. The aim of this work is to develop a theoretical model for the design and performance of Darrieus type vertical axis wind turbine for small scale energy applications...
Bangla is the sixth largest language and around one eighty five million people around the globe speak in Bangla. However, there is a strong difference in the style of speaking Bangla among the people of different regions. Although there were many efforts for translation of information between English and Bangla languages, according to our knowledge, so far there is no consideration about the computerization...
Semantic analysis involves using knowledge of the meaning of words and the structure of the sentence to find a representation of the meaning of the sentence. Without having any semantic analysis of a source sentence, it is very difficult to find the accurate meaning and hence translation of that sentence into an equivalent target sentence. In this paper, we propose a framework for the semantic analyzer...
AUTOSAR (AUTomotive Open System Architecture) is a layered and modular software architecture which simplifies the complexity of automotive system design. Currently, this standard has no support for fault tolerance. Fault tolerance will be required in the design for future automotive systems to avoid catastrophic system failures and hazardous events. In this paper, we present an experimental study...
The fundamental objective of this paper is to describe the design and implementation of a magnetic levitation system using phase lead compensation technique. It also verifies the possibility of implementing a system with equipments available in Bangladesh with nominal expenditure. Magnetic levitation is the phenomenon of suspending an object in space using magnetic force. By overcoming the pull of...
Scientists are desperately searching for renewable and green sources of energy to produce electrical power. In past several years, researchers have begun using piezoelectric material for structural vibrations suppression. These materials transform mechanical energy to electrical energy and vice versa. The objective of this paper is to present an effective method for producing usable electrical energy...
In this paper, a microcontroller based portable wind speed detection and wind direction monitoring system has been designed as well as developed. An infra-red light-emitting diode (LED) and a photo diode has been used as a transmitter and receiver respectively. The resolution of optical sensor for measuring speed is six pulses per rotation. The designed system is used to find out the all possible...
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