Innovative Vibrating Hydraulic Dredge for Striped Venus (Chamelea gallina) Fishing

This work proposes the experimentation of an innovative hydraulic dredge for clam fishing (Chamelea gallina) in the Adriatic Sea (Italy). This innovative gear aimed at increasing the selectivity of the typical hydraulic dredge used currently, while at the same reducing the impact on benthos through the conception, installation, and experimentation of innovative technological solutions, consisting mainly of a vibrating bottom panel on the dredge and a “warning device” on the dredge mouth. Comparative experiments of the traditional vs. the modified gear, employing two boats fishing in parallel on the northern coast of Abruzzi (Adriatic Sea) and contrasting the catch with both paired comparisons and through modelling, showed that the innovative hydraulic dredge retains fewer undersize clams while yielding similar amounts of commercial product, moreover of higher quality; at the same time, it takes on board less discard, and catches significantly less vagile fauna. In short, the innovative gear is gaining five times over a list of six parameters considered as positive and/or advantageous for the clam fishery. The results allow proposals of potential improvements to clam-fishing instruments to make the selection processes more effective while promoting a lower impacting fishery, which is essential for clam management.

Special Vehicles to Prevent Touching High-voltage Lines Monitoring and Warning Device

Domestic regional special vehicles and construction personnel high-voltage electrocution accidents always occur, resulting in large-scale equipment and socio-economic losses. Based on this, in order to effectively reduce special vehicles touching high-voltage lines causing safety accidents, this paper researches and designs a safety monitoring and warning device for special vehicles touching high-voltage lines, mainly including sensor monitoring templates, signal transmission templates and monitoring and warning alert templates, through the decoding of different template principles, combined with electric field induction and wireless transmission principles, the safety distance of high-voltage lines is relevant to explore, then when Special vehicle objects into the safety distance threshold, that is, to start the information monitoring alarm, to remind the construction of special vehicle equipment and personnel away from electrocution, to ensure safe production. Through the monitoring and warning device, the rationalization, economy and safety of high-voltage line can be achieved.

High School Junior Builds Cheap Earthquake Warning Device

The project exploring seismic noise during the coronavirus pandemic was fueled by Google searches and bathroom soldering sessions.

MANHÃ CINZENTA: SOCIOLOGIA E CINEMA / Gray morning: sociology and cinema

O artigo analisa o filme Manhã cinzenta (1969), dirigido e produzido por Olney São Paulo e fotografia de José Carlos Avellar. A trama gira em torno de um acontecimento (um golpe de Estado) ocorrido em lugar não mencionado (embora identificável). A ideia é identificar as relações encenadas entre os grupos sociais mencionados no filme, com ênfase nas duas personagens principais, tomando como hipótese a ideia de que o filme pode ser visto como uma espécie de “dispositivo de alerta”.Palavras-chave: Sociologia; Análise de filme; “Dispositivo de alerta”.AbstractThe article analyzes the film Morning Gray (1969), directed and produced by Olney São Paulo and photography by José Carlos Avellar. The plot revolves around an event (a coup d'état) that took place in an unmentioned (though identifiable) place. The idea is to point out the staged relationships between the social groups mentioned in the film, with an emphasis on the two main characters, taking as an hypothesis the idea that the film can be seen as a kind of “warning device”.Keywords: Sociology; Film analysis; “Warning device”.

Adaptive Safety Early Warning Device for Non-contact Measurement of HVDC Electric Field

In order to prevent electric shock accidents during the maintenance and repair of high-voltage direct current (DC) live equipment, an intelligent safety early warning system device based on non-contact electric field measurement is developed in this paper, to ensure the life safety of electrical workers and the stable operation of equipment. Firstly, the self-developed electric field sensor is used to measure the electric field strength of the space around the charged device. The STM32 microprocessor in the sensor will compare the measured electric field value with a preset safety threshold. If the safety threshold is exceeded, the early warning device issues an audible alarm. It prompts the electric power operator to exit to a safe distance. In addition, the alarm prompt symbol and the real-time waveform of the measured electric field can be seen intuitively on the mobile smart APP interface. Secondly, for devices with different voltage levels, the sensor electric field measurement range and sensitivity can be dynamically adjusted by changing the motor speed. In addition, according to the voltage level identification algorithm, this is also to achieve an adaptive safety early warning of different live equipment. Finally, field experiments were performed at a ±500 kV DC converter station and an ±800 kV DC transmission line experimental platform. The measured values of the electric field are basically consistent with the simulated values, and the safety early warning device has no false positives or false negatives during the test. The experimental results show that the design of the safety warning device in this paper meets the actual needs, and it can alert the electric workers to the specified safety distance.