This paper describes new algorithms for spread spectrum time domain reflectometry (SSTDR) for detecting and locating faults in photovoltaic (PV) panels. Specifically, we present a new method for identifying the impeda...
This paper describes new algorithms for spread spectrum time domain reflectometry (SSTDR) for detecting and locating faults in photovoltaic (PV) panels. Specifically, we present a new method for identifying the impedance of multiple loads (such as PV panels) on a single transmission line. This method is based on adapting a well-known algorithm, known as orthogonal matching pursuit, to match simulated waveforms with multiple reflections in an SSTDR waveform. We demonstrate that our method successfully extracts waveform data from the SSTDR experiments and correctly estimates load impedances corresponding to reflections in this waveform data. We experimentally demonstrate that our method correctly estimates the capacitance values of various capacitive loads on a transmission line with an error as low as4%.
Vertical electrical impedance scanning of concrete bridge decks is a non-destructive method for quantifying the degree of protection provided to steel reinforcement against the ingress of corrosive agents. Four concre...
Vertical electrical impedance scanning of concrete bridge decks is a non-destructive method for quantifying the degree of protection provided to steel reinforcement against the ingress of corrosive agents. Four concrete bridge decks with asphalt overlays in northern Utah were evaluated using scanning vertical electrical impedance measurements in this study. At the time of testing, the bridges ranged in age from 21 to 34 years, and asphalt overlays had been in place for 7 to 22 years, depending on the bridge. Electrical impedance measurements were collected using a previously constructed apparatus that consisted of six probes spanning a transverse distance of 12 ft. The impedance measurements were compared to surface cracking observations and cores obtained from the same four bridge decks. The results presented in this paper demonstrate the utility of scanning vertical electrical impedance measurements for detecting cracks in asphalt overlays and quantifying their severity. In addition, the results demonstrate the sensitivity of impedance measurements to the presence of an intact membrane beneath the asphalt overlay.
Hydroponics is a method of farming without soil. One of the Hydroponic plants is Watercress (Nasturtium Officinale). The development and growth process of hydroponic Watercress was influenced by levels of nutrients, a...
Hydroponics is a method of farming without soil. One of the Hydroponic plants is Watercress (Nasturtium Officinale). The development and growth process of hydroponic Watercress was influenced by levels of nutrients, acidity and temperature. The independent variables can be used as input variable system to predict the value level of plants growth and development. The prediction system is using Fuzzy Algorithm Mamdani method. This system was built to implement the function of Fuzzy Inference System (Fuzzy Inference System/FIS) as a part of the Fuzzy Logic Toolbox (FLT) by using MATLAB R2007b. FIS is a computing system that works on the principle of fuzzy reasoning which is similar to humans’ reasoning. Basically FIS consists of four units which are fuzzification unit, fuzzy logic reasoning unit, base knowledge unit and defuzzification unit. In addition to know the effect of independent variables on the plants growth and development that can be visualized with the function diagram of FIS output surface that is shaped three-dimensional, and statistical tests based on the data from the prediction system using multiple linear regression method, which includes multiple linear regression analysis, T test, F test, the coefficient of determination and donations predictor that are calculated using SPSS (Statistical Product and Service Solutions) software applications.
Cadmium oxide (CdO) thin films of thickness 50 to 200 nm were deposited on glass substrates maintained at 400°C using spray pyrolysis technique. CdO thin films were deposited by varying the molar concentrations o...
Cadmium oxide (CdO) thin films of thickness 50 to 200 nm were deposited on glass substrates maintained at 400°C using spray pyrolysis technique. CdO thin films were deposited by varying the molar concentrations of cadmium acetate solution such as 0.01, 0.05, 0.1, 0.15 and 0.2 M. X-ray diffraction studies reveal that the films are polycrystalline in nature with cubic structure. SEM images show that the films have well defined spherical grains and grain boundaries are seen. Optical studies reveal that the films prepared from solution of 0.01 and 0.1M concentration have high transparency than films prepared at other solution concentration. The optical energy band gap value decreases from 2.50 to 2.37eV with the increase in molar concentration. Electrical studies revealed that the CdO thin film prepared using 0.1M solution possesses lowest resistivity.
This study aims to design an autonomous hexacopter drone that can be used to deliver documents in IPB University, to replace conventional oil-fueled transportation. The hexacopter drone is designed with autopilot cont...
This study aims to design an autonomous hexacopter drone that can be used to deliver documents in IPB University, to replace conventional oil-fueled transportation. The hexacopter drone is designed with autopilot control using a point-to-point flight system based on GPS coordinates. Preliminary research was conducted to examine the delivery of documents between the Faculty of Mathematics and Natural Sciences (FMIPA) and the Faculty of Agricultural Technology (FATETA). The experimental results showed that the maximum payload of the designed drone is 1 kg. The drone flight tests showed that the drone can reach its destination with good performance. The average error for the unloaded flight test from FMIPA to FATETA is 1.02 m, while from FATETA to FMIPA is 0.53 m. Meanwhile, the average error for flight tests with a maximum payload (1 kg) from FMIPA to FATETA is 1.97 m, while from FATETA to FMIPA is 0.703 m.
Agile is a method that moves quickly, lightly, and approachable in developing a software process. The primary goal of agile methodology is to produce high-quality software in a quicker time. It is using this methodolo...
Agile is a method that moves quickly, lightly, and approachable in developing a software process. The primary goal of agile methodology is to produce high-quality software in a quicker time. It is using this methodology for developing the Academic Resource in a system provided by software for maintaining academic and financial records of data efficiently and conveniently. The administration of any academic association must make records of students registered and the staff of the university on paper and keep them safe, which is a tedious task due to the increase in manual work that reduced the utilization of the efficiency of staff. This paper describes a systematic approach to developing a user-friendly, flexible, and easy-to-maintain environment for academic resources using agile's extreme programming. The execution of the different tasks to develop the system is used to widen the horizons in Agile Methodologies step by step.
William Spataro, Donato D’Ambrosio, Rocco Rongo, Alfonso Senatore; Preface to the special session High performance computing in modeling and simulation, AIP Con
William Spataro, Donato D’Ambrosio, Rocco Rongo, Alfonso Senatore; Preface to the special session High performance computing in modeling and simulation, AIP Con
The article was published online on February 27, 2012 with the acknowledgment missing. It was purely an unintentional error for which the authors regret.
The article was published online on February 27, 2012 with the acknowledgment missing. It was purely an unintentional error for which the authors regret.
In this paper, a dual-band printed rectenna of compact size (38×24) mm2 has been designed and analyzed to work at GSM frequency of 900 MHz and WiFi frequency of 2.4 GHz for wireless power transmission. The purpos...
In this paper, a dual-band printed rectenna of compact size (38×24) mm2 has been designed and analyzed to work at GSM frequency of 900 MHz and WiFi frequency of 2.4 GHz for wireless power transmission. The purpose of this design is to harvest energy at two different frequencies to increase the probability of receiving power from ambient field. The antenna part of this rectenna is printed on FR4 substrate and has the shape of meander line with two arms for double-band operation. The rectifier part of this rectenna consisted of impedance matching network, AC-to-DC conversion circuit and a DC filter. The design and simulation results of this rectenna have been done with the help of CST 2019 and ADS 2018 software packages. At a received input power of -30 dBm and a load resistance of 1900 Ω, the maximum conversion efficiencies obtained by this rectenna at frequencies of 900 MHz and 2.4 GHz are found as 23% and 42% respectively.
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