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Temperature is an important factor that limits the current-carrying capability of overhead transmission lines. An online estimation approach is proposed in this study to dynamically track the temperature of transmission lines and thereby fully use their capability. In the proposed approach, the temperature is represented as a function of the transmission loss and current. A Kaiman Filter model is...
Sun hours is one of the parameters used in Photovoltaic system design in determining whether installation of a solar system would be recommended for a particular region, with a minimum of 5 sun hours per day being a recommended standard. As a result, photovoltaic systems are preferably installed in areas with long sun hours and these invariably have high temperatures. However, studies carried out...
There is a need for a model that accurately describes dynamics of a bound-to-continuum terahertz quantum cascade laser over its full range of operating temperatures and bias conditions. In this paper we propose a compact model which, through the inclusion of thermal and Stark effects, accurately reproduces the light-current characteristics of an exemplar bound-to-continuum terahertz quantum cascade...
Field test is performed in diverse environments, in which temperature varies across a wide range. As temperature affects a circuit delay greatly, accurate temperature monitors are required. They should be placed at various locations on a chip including hot spots. This paper proposes a flexible ring-oscillator-based monitor that accurately measures voltage as well as temperature at the same time. The...
A more intense metabolism of cancer cells versus normal cells may be an important source of heat which produces changes of the affected breast tissue thermal field. In very early tumors, when neoangiogenesis has not been developed yet, the thermal effect can be important for detection. The temperature changes on the breast surface can be measured and can serve as a breast cancer screening process...
In this paper we study the actuator's faults detection at the steam superheaters using residual vectors. This method was experimentally verified using the superheaters model. The simulation was developed under Matlab Simulink.
In this paper a state observer for a distributed parameter system (DPS) with nonconstant parameter functions is presented. The DPS describes the freezing of foodstuff in vertical plate freezers and is a nonlinear heat equation. The observer is based upon the Extended Kalman Filter, meaning that the nonlinear heat equation has been discretized in the spatial domain before designing the observer. We...
This paper presents a light-emitting-diode (LED) model based on the four-parameter Taylor series to describe the V-I characteristic of the LED at different junction temperatures. Therefore, in order to precisely model the LED non-linear characteristics at different junction temperatures, an improved Taylor series based LED model is proposed according to the four available parameters: maximum operating...
Greenhouses can help farmers reduce spoilage and increase yields, and therefore improve their livelihoods. As compared to open air farming, greenhouse farming requires less water due to reduced evapotranspiration. Current estimates on water savings vary from 10 to 100% and fail to clearly specify relevant test parameters such as the irrigation method, size of the greenhouse, or climatic conditions...
Advanced power semiconductors such as DMOS transistors are key components of modern power electronic systems. Recent discrete and integrated DMOS technologies have very low area-specific on-state resistances so that devices with small sizes can be chosen. However, their power dissipation can sometimes be large, for example in fault conditions, causing the device temperature to rise significantly....
Operating junction temperature of LEDs is linked directly to lifetime, long term reliability and failure modes of LED luminaires. It is important to measure the operating junction temperature to assess the health of a LED luminaire / solid state lighting product. Measuring the junction temperature of LEDs is a difficult task as in modern LED luminaires the tiny LEDs are surrounded by optical system...
The photovoltaic (PV) cell temperature has a significant influence on the PV panel's efficiency. In this paper, ten equations expressing the PV cell temperature as a function of meteorological conditions are compared against measured values of the cell temperature. The results showed that some equations were more adapted to different kind of weather then others. Calculations displayed a mean absolute...
This paper presents a real-time capable battery aging estimation to enhance state-of-the-art eco-driving concept with battery maintenance strategy for potentially advancing electric vehicles (EV) sustainability. This methodology focuses not only on estimating battery aging according to the input parameters during driving and resting period but also optimizing withdrawn battery power. This is derived...
In this paper, we report the development of water tank for underwater acoustic communication. Compared to most of underwater test tank, the tank may be considered as mini in term of its size. However, the test tank is intended to serve as controlled environment to develop a theoretical model and its validation experimentally before full-scale test at sea. We present on how to analyze the physical...
The Indian Institute of Technology, Jodhpur (IITJ) has been monitoring and recording all the parameter of 101 kW (43.30 kW A-Si PV system located in Block 1 and 58.08 kW C-Si PV system in Block 2) grid tied solar photovoltaic system over the 4 year. The paper present the operational data 43.30 kW amorphous silicon (A-Si) based PV system located at Block 1 and 58.08 kW crystalline silicon based PV...
Terahertz metamaterial technique enables a sophisticated electromagnetic excitation of materials. Here, we demonstrate resonant excitation of spin precession motion of canted antiferromagnet ErFeO3 using the magnetic near-field produced by split ring resonator (SRR). When the resonance frequency of spin precession was near the magnetic resonance mode of SRR, we observed substantial increase of precession...
We present a new analytical model combining the heat equation with rate equations to reproduce experimentally obtained output intensity of terahertz quantum-cascade lasers subject to optical pulse injection and demonstrate good agreement with the experiments.
This paper introduces an investigation on the thermal effects of dielectrophoresis on cerebrospinal fluid (CSF). It highlights the temperature propagation in CSF according to applied voltage and generated electrical field in a limited area of the brain. Through the described study, the temperature increase is considerable in the close surrounding area of electrodes where applied voltage goes up to...
Thermal management faces a challenge in high power and density packaging. Microchannel is a promising technique for heat transfer in minimized devices. However, the high power chip has a flat structure to need a microgap for heat transfer in efficiency. This paper studied the heat transfer with non-boiling in microgap with gas-water two-phase flow based on the phenomenological theory. The input heat...
Silicon PiN diodes are the most widely used rectifying technology in industry especially in voltage source converters. The PiN diodes are usually used as anti-parallel diodes across silicon IGBTs where they conduct current in the reverse direction as the current commutates between the phases of the converter. They tend to generate a considerable amount of energy losses during the turn-OFF transient...
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