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关键词： Mechanical engineering   Systems engineering   Safety engineering   Natural hazards   Computer science   Fire protection   Tunnel fire   Firefighting   Fire detection and suppression   Image processing   Water mist   Jet fan  

摘要： Several tunnel fire detection and fighting systems are currently available in the market, each with its own pros and cons. Although no single system is perfect, the water mist system is one of the top-performing conventional tunnel fire suppression systems available. The problem is that such system is expensive. More affordable equipment with similar performance would be a breakthrough in the field of tunnel safety. Accordingly, this study develop a new water mist system, in which ventilation jet fans are utilized in such a way to achieve economical feasibility. The system features monitoring cameras use to determine fire coordinates and mist-generating jet fans employed to suppress fire. The front of the ventilation jet fans is equipped with nozzles, which spray water frontward through the fans, thereby creating mist and propelling it toward the location of a fire. The mist that shoots out of the fans reduces ambient temperature, flushes oxygen, cools the surface of inflammable materials, and weakens radiative and convective effects. The simulation of the proposed system shows a low heat release rate, smoke and toxic fumes reduction, tunnel ventilation speed increases, and improved visibility. These improvements enhance tunnel safety and make tunnel conditions during a fire less threatening to human health. The cost of the system put forward in this work can be further reduced by optimizing the materials that constitute the pipes and fittings and removing the firefighting pumps.

关键词： Computer science   Economics   Intellectual-property rights  

摘要： Despite obstacles, such as an ongoing trade war between China and the United States, artificial-intelligence researchers are working to ensure they can collaborate internationally.

关键词： capital punishment   Christopher Lee Price   crime   death penalty   general news   legal action   manslaughter   murder   political   politics  

关键词： capital punishment   Christopher Lee Price   crime   death penalty   general news   legal action   manslaughter   murder   political   politics  

关键词： Computer science   Engineering  

摘要： Object manipulation using an innovative glove allows large databases of detailed pressure maps to be obtained. Such data could lead to advances in robotic sensing and in our understanding of the role of touch in manipulation.

关键词： Aeration   Substrate   Penaeus monodon   Periphyton   Stocking density   Black tiger shrimp   FARFANTEPENAEUS-PAULENSIS   ARTIFICIAL SUBSTRATE   MICROBIAL DYNAMICS   C/N RATIO   NURSERY   BIOFILM   COMMUNITIES   L.  

摘要： Growth performance of black tiger shrimp Penaeus monodon juveniles were evaluated in two outdoor experimental trials as a function of two stocking densities and aeration system in substrate based shrimp culture. The experiment 1 had 2 x 2 factorial design with two levels of stocking density and two management systems (with and without substrate addition) resulting in four treatment, each with three replicates. The 12 FRP tanks (1000 L) were stocked with P. monodon juveniles (1.08 +/- 0.12 g) at 10 and 20m2 as first factor, and with substrate (10+ S and 20+ S) and without substrate (10-S and 20-S) as second factor. In experiment 2, effect of aeration in substrate system was evaluated in 1000 L FRP tanks with P. monodon (3.89 +/- 0.12 g) in four treatments: provision of aeration (A) with substrates (S+ A), without substrate (C+ A), and absence of aeration with (S-A) or without substrate (C-A). In both experiments, bamboo substrates (5 x 2 x 1 cm) were installed in substrate based groups which generated an additional 540 cm 2 surface area for periphyton development. Formulated feed containing 38% crude protein was provided in both the experiments. In trial 1, stocking density did not significantly affect water quality parameters, whereas provision of bamboo substrate significantly reduced nitrate-N level (P < .05). Both stocking density and substrate addition played significant role in shrimp survival by 14-30% improvement due to substrate addition while 18-34% changes in survival due to stocking density. The substrate addition improved FCR significantly (P < .05) by 21-33% compared to without substrate based treatments. In experiment 2, lack of aeration significantly affected the dissolved oxygen level (P < .05) in the water column, while it does not significantly affected the growth parameters, and substrate addition alone improved 21% of survival rate of shrimp. Estimation of periphyton biomass revealed that stocking density and aeration effects resulted 60 and 40%

摘要： Science fiction has a cautionary view of computer vision and machine learning.

关键词： Arts   Computer science   Human behaviour   Technology  

摘要： A bold, multifaceted exhibition on artificial intelligence wows Elizabeth Gibney.

关键词： artificial intelligence   can a computer laugh?   computer science   computer science major   consumer tech: computers   higher education   stem courses   stem majors   studying computer science   supercomputers