Photocatalytic extraction of uranium from solution is one the most promising technologies for recovery. However, presence axial bonds between two oxygen atoms in UO22+ creates...

Subsea tunnels are different from mountain in many aspects. During the construction process using drilling and blasting methods, there complex environments such as unlimited seawater replenishment geological structures that pose serious challenges to safety. In order more accurately assess safety of subsea so reduce probability disasters, this article proposes characteristic indicators "overburden thickness/depth overlying seawater" (RSR) for tunnels, combines cloud model theory with...

Ammonium phosphate fire-extinguishing agents are one of the best substitutes for halon in many powder media. Here, 11 μ m median diameter ammonium ultrafine dry was used as a medium. The performance under different pressures studied by analyzing time, amount extinguishing agent, and temperature during process. results show that is improved with increasing injection pressure. Finally, we FDS software fire simulation to study influence pressure on agent. time shortened From 0.2 MPa 1.0 MPa,...

Abstract AA2195-T8 Al–Li alloy plates were welded by friction stir welding (FSW) at tool rotational speed of 1,000 rpm and traverse speeds (TS) 100–400 mm·min −1 under three types butting surface conditions, i.e., (1) without treatment, (2) milled, (3) bead-on-plate welding. The effect heat input condition on joint line remnant (JLR) mechanical properties 2195-T8 was investigated comprehensively. In the zone FSW joints, there exists JLR composed alumina-particle arrays microcracks generated...

The effect of magnesium addition on the formation and evolution inclusions in Mn–Si killed steel is studied by laboratory experiments thermodynamic calculation. Samples were taken at different holding time after to study transient inclusions. morphology, composition, number diameter thoroughly analyzed SEM-EDS. results show that four types (MgO–SiO2–MnO liquid inclusion, MgO–SiO2–MnO complex MgO–SiO2 MgO solid inclusion) form with amount addition. Liquid inclusion MnO–SiO2 promptly modified...

In the stage of aircraft development and airworthiness verification, it is necessary to master influence lithium-ion battery (LIB) thermal runaway (TR) propagation. this paper, TR propagation behavior under different trigger positions modes studied experimentally, calculation comparison are carried out from parameters real-time temperature, voltage, speed, total energy released, solid ejecta. When two adjacent cells at top corner, side, center module overheated, occurs about 1000 s for...

Tunnel constructions often encounter unforeseen disasters, such as water inrush, bursting mud and some other geological hazards, which cause great casualties, economic losses environmental destruction. Taking one karst tunnel an example, through applying the supplemental geology survey analysis, development law is discussed. The risk evaluation system with 4 ranks about put forward. Main control factors of formation lithology, structure underground etc. were synthetically considered. Based...

This paper describes the development process and progress of POGO suppression technology launch vehicle at home abroad, such as in United States, former Soviet Union, Europe, Japan China. The characteristics inspirations mini-POGO cavitation dynamics are summed up. American has experienced Titan 2—Saturn V—Space Shuttle—analysis specific issues. Similarly, China also four stages 331 project—Manned Spaceflight project—New generation vehicle—40Hz issue. It can be seen that vibration showed...

Because of increasing energy consumption and severe air pollution in China, solar photovoltaic power generation plants are being deployed rapidly. Owing to various factors such as technology, construction, imperfection construction standards, systems have certain fire risks. This paper focuses on the risks building‐integrated buildings, well temperature heat flow density near a system fire. Based FDS simulation results, influence different building fires is analysed. It found that installed...

It is crucial to guide airplane passengers in effectively choosing reasonable evacuation exits, according the consequences of post-crash accidents. This paper presents a performance simulation method analyze safety procedures. The temperature and concentration carbon monoxide are pointed out as main threats during evacuation. Thus, modified formulas these two hazard factors defined lines measure overrun each indicator. Fire Dynamics Simulator Pathfinder used available safe egress time...

The disturbance of disruptive passengers in the cabin seriously affects aviation security China. Reducing occurrence disturbances is an inevitable choice to strengthen civil China and improve emergency disposal airlines. Therefore, this paper investigates strength government support, benefits cooperation punishment disposers, uses event tree method analyze relevant subjects affecting consequences disruptions. To end, a management game model comprised regulatory authority, airline was then...

Morphology- and size-controlled 3D mesoporous Cr2O3 have always been a research hotspot due to their wide applications. Herein, we for the first time report that carbonized Cr-MOFs can ignite spontaneously at room temperature form corresponding with high specific surface areas (219.25 303.44 cm2 g-1). More importantly, shape size of be well controlled by facile adjustment Cr-MOF synthesis conditions. Furthermore, these materials showed an exceptionally catalytic performance in formaldehyde...

Analyzing the emergency response process and time characteristics after aircraft fires is extremely important for airport safety. Due to nonprocess-related elements, Petri net model of generally complex difficult revise expand. In this study, actantial was used analyze semantic structure actions in model, actantial-timed (A-TPN) hybrid proposed problem solving. The analyzed as a case study explain application steps A-TPN model. First, types elements should be divided into process-related...