results linear mixed model analyses showed that athletes slept on average 43 minutes longer when they slept during usual (night) times than during abnormal (day) times. in general, sleep duration decreased during the race with on average 18 minutes per period. conclusions this pilot study shows that, even under extreme violation of sleep hygiene rules, there still is an apparent effect of circa...

Generally speaking, security has been a major concern in every nook and cranny of our nation -Nigeria. Recently, cases vandalisation, stolen vehicles, related issues have on the increase. The personnel done lots work to curb this menace but most their actions not yielded expected results. Therefore, there is need use technology create safer society. Such will GSM camera for detections. going re...

Emission of greenhouse gases and depletion of fossil fuel reserves are two key drivers, which are forcing the mankind to generate the future energy demand from the renewable energy resources. These resources are generally distributed in nature and are directly integrated at distribution levels. Increasing penetration of the distributed energy resources in distribution power networks creates add...

IEEE 802.16 standard is created to compete with cable access networks. In the beginning end users are immobile and have a line of sight with base station, now it moved to mobile non line of sight (NLOS) with the new standard IEEE 802.16e and IEEE 802.16j. The new IEEE 802.16j standard which is an amendment to IEEE 802.16e is mobile multi hop relay (MMR) specification for wireless networks. This...

An efficient numerical method for the design and synthesis of compensator for a relay type control system is developed and discussed. Previous works based on the interactive graphic method are reviewed and it is shown that the combination of the trequency and time domain numerical techniques provide a powerful tool in design of a wide class of relay control systems. An example is presented to d...

In this paper, a cooperative algorithm to improve the orthogonal space-timefrequency block codes (OSTFBC) in frequency selective channels for 2*1, 2*2, 4*1, 4*2 MIMO-OFDM systems, is presented. The algorithm of three node, a source node, a relay node and a destination node is formed, and is implemented in two stages. During the first stage, the destination and the relay antennas receive the sym...

Abstract A gas relay is an important non-electric protection device for transformers. Under the action of vibration caused by sudden short circuit impact, misoperation leads to transformer tripping accidents frequently. In order explore relationship between intensity and anti-vibration performance during a circuit, capacity test were carried out. The analysis data shows that process will cause ...

The restricted earth fault (REF) relay is a type of differential protection which is used for detection of internal ground faults of power transformers. But, during external faults and transformer energization conditions, the probability of current transformer (CT) saturation increases. Thus, the spurious differential current due to CT saturation, can lead to REF relay maloperation. In this pap...

Neutral point earthing of mid-voltage grids is implemented variously around the world, depending on practice individual countries with emphasis technical regulations in force. Croatia process transition from star-point through resistors to resonant earthing. Questions choice arc suppression coil technology and consequences for operation relay protection transformer stations arise relation that....