34 research outputs found
Voltage Regulation on High PV penetrated Distribution system using Electric Vehicles
No full textThe penetration of renewable energy sources is increasing every year and that poses a lot of challenges in the distribution system. Since they are intermittent in nature, they cannot serve the energy demand as stand alone sources without the help of storage technologies or stable energy sources. As the RES, especially the Photo Voltaic generation units are often connected in the distribution system, their intermittent nature may result in a sudden rise or fall in overall generation. Hence the voltage has to be kept within limits to prevent the failure of the system. Storage technologies plays an important role in keeping the voltage levels under control. From the consumer perspective, the usage of electric vehicles is steadily increasing and most of the vehicles are connected to public charging stations to charge the vehicle battery. Hence there is an interaction between the EVs and distribution grids, which is utilized as a storage option here. In this research, the voltage changes due to the penetration of renewable energy sources in the distribution system is regulated by using the electric vehicles as a storage option. This thesis tries to give an understanding on the strategy applied towards regulation of voltage in the distribution system using electric vehicles. The strategy will serve as a platform for regulating voltage using electric vehicles and it can be adapted to any such distribution network. This strategy takes into account the size and capacity of the battery, battery state of charge and the availability of electric vehicles for a given day. Consensus algorithm serves as the communication platform for information interchange between the electric vehicles connected in the network. Average consensus algorithm estimates the average state of charge of the electric vehicles connected in the distributed network and that has been used to ensure equitable contribution of power among the electric vehicles. Markov model is used to simulate the travel pattern of the electric vehicles. This provides a more realistic and accurate pattern of travel. Markov model is implemented with and without considering time of occurrence and the results shows that the pattern is more accurate when time is considered as a parameter. Considering the generated travel pattern, voltage level of the buses in the network and the output from the consensus algorithm, the voltage has been regulated. The Electric vehicles are used for regulating the voltage when the voltage level is beyond the tolerance limits, and during other times, the electric vehicles charge their batteries. This is executed by controlling the charging and discharging cycles of the electric vehicles. The results are discussed based on different cases and the advantages and limitations of each case is explained in detail. The simulation is not robust since the availability of electric vehicles is uncertain. To make it more robust, monte carlo simulations are used. The probability of occurrence of several events has been estimated using monte carlo simulations and through the results, the availability is predicted to a certain extent. Different cases are implemented and analysed and the results shows that the availability depends on the bus, the location of the bus and the travel behaviour of the electric vehicles. Each case is discussed separately and the degree of uncertainty is reduced at the end.Electrical Engineering | Sustainable Energy Technolog
New Initiative: The Naturalness of Software
No full textAbstract—This paper describes a new research consortium, studying the Naturalness of Software. This initiative is supported by a pair of grants by the US National Science Foundation, totaling 600,000 helped kickstart an inter-disciplinary effort, and demonstrate feasibility; a follow-on full grant of $2,000,000 was recently awarded. The initiative is led by the author, who is at UC Davis, and includes investigators from Iowa State University and Carnegie-Mellon University (Language Technologies Institute). I
Evaluation of low-temperature properties of Asphalt Binders and mixtures
No full textBecause of the widespread use of modifiers and additives in asphalt bitumen, this study revisits and evaluates the adaptation of the time-temperature superposition principle that is incorporated into the low-temperature Superpave® binder specifications. The study builds on results of bending beam rheometer (BBR) tests conducted on samples of asphalt binders used in seven different surface layer mixtures. Both 240-s and 2-h BBR tests were conducted at three different temperatures: the low temperature of the asphalt performance grade (TL), 10 C higher than the low-temperature grade (TL- sub+10), and at -5 C to construct the flexural creep stiffness master curves. Additionally, indirect tensile tests were conducted on the surface layer mixtures to determine the low-temperature properties. The BBR test results show that the methodology adopted in using the equivalence principle to formulate the low-temperature Superpave binder specifications does not accurately apply for some of the binders used in this study. Thus, modifications to the specifications for loading times and test temperatures are suggested. Further, the time-temperature shift factors for the binders evaluated are compared with the universal shift factors used in the SHRP study. The observed mismatch in the shift factor sets is in disagreement with the implicit assumption that all asphalt binders can be characterized by similar shift factors at low temperatures. The shift factors of the binders and mixtures used in this study tend to match well, particularly at high testing temperatures.Anderson D. A., 1994, A367 SHRP TRB NAT RE, V1; Anderson D. A., 1994, A369 SHRP TRB NAT RE, P3; Anderson D. A., 1990, ARD88078 FHWA US DEP; Asphalt Institute, 1996, SUP MIX DES; Bahia H. U., 1993, STP ASTM, V1241, P28; Bahia HU, 1992, P ASS ASPHALT PAVING, V61, P117; Bahia H.U., 1991, THESIS PENNSYLVANIA; Basu A, 2003, TRANSPORT RES REC, P1; Buttlar W. G., 1996, THESIS PENNSYLVANIA; Marasteanu MO, 2000, TRANSPORT RES REC, P1; McLeod N. W., 1968, P 13 ANN C CAN TECHN; Readshaw E.E., 1972, J ASS ASPHALT PAVING, V41, P562; Wen H., 2001, THESIS N CAR STAT U0
Mobile phone application : recording on going phone conversations in mobile phones
No full textPreviously, call recording applications were common in mobile operating system such as Symbian. As technology advances rapidly, Symbian is slowly being phased out. Currently, modern mobile operating system starts to take the place of Symbian. The most commonly used mobile operating systems currently are Apple iOS and Google Android.
However, there are currently limited applications on mobile phones using modern operating system such as iOS and Android that record phone conversation. Having an application that is able to record phone conversation will be useful in many ways. Firstly, these recorded conversations are useful in verification and forensic analysis which can be used in court. Secondly, it can also be used by journalist to record their phone interview with the other party. Thirdly, it can be used in businesses whereby the seller cannot deny something that has been agreed upon. Fourthly, it can also be used as evidence against any sort of harassment on the phone and lastly, during instances when you do not have a pen and your friend is telling you the direction on where to go or the phone number that you should call.
An application that record voice calls for Android is proposed. Android programming was intensively studied to allow the author to program for Android phones. Then, research work was done on how to program the application and at what point does the application start to enable the user to record effectively. The application named Call Recorder was developed and it worked as desired.
The report illustrates some literature review of Android, how the application works and also some ways to improve on the application. Bachelor of Engineering (Computer Engineering
Data from 617 healthy participants performing the Iowa gambling task: a "many labs" collaboration
No full textThis data pool (N = 617) comes from 10 independent studies assessing performance of healthy participants (i.e., no known neurological impairments) on the Iowa gambling task (IGT) - a task measuring decision making under uncertainty in an experimental context. Participants completed a computerized version of the IGT consisting of 95 - 150 trials. The data consist of the choices of each participant on each trial, and the resulting rewards and losses. The data are stored as .rdata, .csv, and .txt files, and can be reused to (1) analyze IGT performance of healthy participants; (2) create a "super control group"; or (3) facilitate model-comparison efforts
Structural, vibrational spectroscopic and quantum chemical studies on indole-3-carboxaldehyde
No full textConformational, vibrational spectroscopic and quantum chemical studies on 5-methoxyindole-3-carboxaldehyde: A DFT approach
No full textConformational, vibrational spectroscopic and nonlinear optical activity studies on N,N-Di-Boc-2-amino pyridine : A DFT approach
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