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In this paper, a portable snake-like search and rescue apparatus is developed, which can search and rescue in gap of ruin formed by natural disasters through the life detectors, night video imaging device and other electronic equipment fixed on its tip. It can also provide supplies for survivors under debris. The apparatus consists of two parts, namely the flexible arm and integrated control platform...
There are a variety of uncertainties in construction projects because of the uniqueness, complexity and the one time off characteristics of each project. Especially in the investment decision-making stage, decision-maker grasps so little information that there is a huge informational gap in this stage. The process of mining existing information in the investment decision-making stage is also the process...
A current transformer (CT) system centered on Rogowski coil is introduced to measure the low frequency heavy current of the linear induction motor (LIM) powered by the H-bridge sine pulse width modulation (SPWM) inverter. The frequency of the output current of the inverter ranges from 1 hertz to 200 hertz. The current test apparatus is made of the sensor head of Rogowski coil and the post-processing...
Linear induction motor (LIM) can move along a line rail directly, so it is necessary and feasible to use the position closed-loop method. A mathematical model centered on the synchronous d-q reference frame is presented to analyze the LIM. The position closed-loop method and the secondary field oriented vector control strategy are induced in detail based on the mathematical model. Simulation and experiment...
The coastal cities are always exposed under the risk of different kinds of natural disasters due to their special locations. The integrated risk analysis method should be developed from the commonness of hazard-affected bodies and mainly focus on the risk uncertainties. In this paper, the influence factors about natural disaster hazards and vulnerability of coastal cities are summarized and classified...
During the research of supplementary system for visual impairment people, it has been discovered that it is better to use ZigBee wireless technology considering the reliability, portability and flexibility. Through the independent regionally-covered Zigbee networks and the Zigbee terminal with voice prompts, clients will be able to get to the destination correctly and independently according to the...
The basal economic factors were important to urban disaster-carrying capacity in the economic sub-system. Based on the collaboration, the concept model was set up while the two "disaster-mitigation expenditure with economic output" relationship couples of expenditure of disaster-defense and gross domestic product (GDP), insurance density and available income per person were considered as...
In an industry where vertically integrated firms are allowed to compete with rivals in the downstream market, policy makers are naturally concerned with the risk of discrimination and anti-competitive behavior. This paper argues to the contrary, that in the current environment, the vertically integrated Regional Bell Operating Companies (RBOCs) have no incentive to discriminate against their downstream...
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