Assam Don Bosco University Journals
Not a member yet
795 research outputs found
Sort by
Automatic Cable Fault Distance Locator using Arduino
Get PDFThis paper presents the method of design of a cable fault location sensor for underground cable fault detection. The aim was to detect the fault location from transmitting or receiving station up to few meters accuracy using an Arduino based kit. The underground cable-based supply system is a common practice in urban areas. As explained in the paper, the system uses the principle of a Varley loop to determine the exact distance of the fault in the underground cable up to the accuracy of a meter. When any fault, e.g. short circuit and earth fault occurs, the length of the fault of the cable can be determined from the fault resistance using the bridge in the Varley loop. A microcontroller is used to make the necessary calculations and display the fault distance after that. After necessary calibration and testing, an accuracy of about 85% is achieved in locating the fault using the method
HAMILTONIAN MATRIX REPRESENTATIONS FOR THE DETERMINATION OF APPROXIMATE WAVE FUNCTIONS FOR MOLECULAR RESONANCES
Get PDFWave functions obtained using a standard complex Hamiltonian matrix diagonalization procedure are square integrable and therefore constitute only approximations to the corresponding resonance solutions of the Schrödinger equation.  The nature of this approximation is investigated by means of explicit calculations using the above method which employ accurate diabatic potentials of the B 1Σ+ - D’ 1Σ+ vibronic resonance states of the CO molecule. It is shown that expanding the basis of complex harmonic oscillator functions gradually improves the description of the exact resonance wave functions out to ever larger internuclear distances before they take on their unwanted bound-state characteristics. The justification of the above matrix method has been based on a theorem that states that the eigenvalues of a complex-scaled Hamiltonian H (ReiΘ) are associated with the energy position and linewidth of resonance states (R is an internuclear coordinate and Θ is a real number). It is well known, however, that the results of the approximate method can be obtained directly using the unscaled Hamiltonian H (R) in real coordinates provided a particular rule is followed for the evaluation of the corresponding matrix elements. It is shown that the latter rule can itself be justified by carrying out the complex diagonalization of the Hamiltonian in real space via a product of two transformation matrices, one of which is unitary and the other is complex orthogonal, in which case only the symmetric scalar product is actually used in the evaluation of all matrix elements. There is no limit on the accuracy of the above matrix method with an un-rotated Hamiltonian, so that exact solutions of the corresponding Schrödinger equation can in principle be obtained with it. This procedure therefore makes it unnecessary to employ a complex-scaled Hamiltonian to describe resonances and shows that any advantages which have heretofore been claimed for its use are actually non-existent
Pitfalls of Microcredit towards Sustainable Economic Development of the Microcredit Borrowers Evidence from Rupsha, a Locality of Bangladesh
Get PDFThis paper endeavors to investigate the pitfalls of microcredit towards sustainable economic development in a specific area of Bangladesh. The study obtained the opinions of 50 families from Rupsha, a locality of Bangladesh through a survey on the pitfalls of Microcredit to ensure sustainable development of the borrowers. To conduct this study, qualitative (expert interview, focus group discussion) and quantitative methods was used. The study is based on primary data collection through semi-structured questionnaires and Statistical Package for Social Science (SPSS) was used to analyze the data. The study finds that microcredit institutions charge high interest rate, do not monitor the usage of loan, fail to select right borrowers, do not provide any training to the borrower on effective utilization of loan, frequently loans are used in unproductive sector, short repayment period, gap between the installments is too short, these mentioned pitfalls prevent sustainable economic development of the borrowers. Although in short-term, microcredit plays a significant role to support the borrowers but in long-term it creates burden of loan repayment with high interest rate who fails to use loan properly. Study also finds that microcredit contributes a few borrowers to achieve sustainable development who could utilize the loan properly. Finally, this study comes up with some recommendations to get more benefit from microcredit to ensure sustainable development of the borrowers. Nevertheless, the results of the study are constrained by the size of the sample, area and robustness of the analysis
Performing Binary Logical Operation in Decimal Arithmetic
Get PDFProposed here are the new ways of performing binary logical operations using decimal arithmetic. Usually, binary logical operations such as AND, OR, XOR etc are performed in binary arithmetic which is time consuming and quite erroneous when performed manually. We are familiar with decimal arithmetic, so if we can perform binary logical operations in decimal arithmetic, it will be easier for us and at the same time less error prone and help us understanding the logical operations in a better way. These logical operations are basic building block of digital devices and systems in the modern digital world. Understanding different ways of performing these operations may altogether bring a change in how the digital devices are designed. A deeper study has been made on these operations and a new logical operation named YOR has also been introduced
Parallels and Contrasts in the Popular Folklore of the Chinese and the Nagas
Get PDFThis essay attempts to comprehend the similarities and differencesbetween the Chinese and the Nagas folklore so also to gainremarkable insights and cultural awareness of the both. The papertherefore aims to explore and analyze the parallels and the contrastsin the popular folklore of the Chinese and the Nagas
BUCKLING ANALYSIS OF A SIMPLY SUPPORTED SINGLE-WALLED CARBON NANOTUBE USING NONLOCAL CONTINUUM MODEL AND LAPLACE TRANSFORM
Get PDFUsing nonlocal continuum model we have obtained expressions for transverse deflection and buckling load for a simply supported single-walled carbon nanotube for different aspect ratios ( ). We used Laplace transform method to calculate results. We found that these results are in good agreement with the exact analytical solution and the small scale coefficient has a noticeable effect on the buckling load of the carbon nanotube (CNT). This shows that Laplace transform method can be used in investigating different boundary problems on CNTs with nonlocal effects
Health Monitoring of Induction Motor through Vibration Analysis
Get PDFMachinery monitoring is the process of monitoring a parameter of condition in machinery, such that a significant change is indicative of a failure in development. Temperature, vibration, noise, current, voltage, acoustic emission, etc. – all these measurements are used for machine condition monitoring. Measuring vibration signals of the Non-Destructive Testing (NDT) method is widely used to detect machine faults. There are many studies for the prediction of mechanical wear, fault and failure in this area for several decades. Signal processing techniques are used to obtain vital characteristic information from the vibration signals. This paper attempts to summarize the results of an evaluation of vibration analysis techniques as a method for diagnosis for three-phase induction motors
Microcontroller-based Cable Fault and Insulation Flaw Detection in Low-Voltage Cables
Get PDFThe objective of the work presented here is to detect the exact location of fault or insulation flaw in electrical cables. As described in this report, the system uses two methods. The first one is the principle of a Varley loop to determine the exact distance of the fault in the underground cable up to the accuracy of a meter. When any fault like short circuit and earth fault occurs, the length of the fault of the cable can be determined from the fault resistance using the bridge in the Varley loop. The other method is based on electromagnetic sensing and finds the exact location of the fault. When the current flows through the cable, an electromagnetic field is induced, which is sensed by an inductive coil connected to the electronic amplifier circuit. The microcontroller is used to make the necessary calculations and display the fault distance after that. It also captures the signal from the amplifier and shows a fault or no-fault condition based on the program. This method is a cheaper and simpler alternative to existing ones for detecting cable insulation flaw