A set of questionnaire is designed to investigate the panic related psychology and behaviors evacuation crowds in subway emergencies. Field survey at a station Nanjing, China conducted. Based on 141 valid samples, correlations between some personnel characteristics are investigated. It found that gender, education level carrying-on luggage have strong correlation with behaviors, while age safety knowledge do not so correlativity as previous work indicated. Besides, different opinions this...

In this article, the polyaniline (PANI)/thermal-exfoliated hexagonal boron nitride (BNO) hierarchical structure (PANI–BNO) was constructed via in situ deposition to improve dispersion and interfacial adhesion of multi-aromatic polystyrene (PS) polar thermoplastic polyurethane (TPU). Because conjugated groups PANI, uniform strong between PANI–BNO PS TPU were achieved. Thermogravimetric analysis results showed that incorporation enhanced thermal stability TPU, i.e., temperatures at both 5 50...

A novel functionalized POSS greatly reinforced the mechanical, thermal stability, and flame retardant properties of PBT.

Casualties during crowd evacuation in many unexpected events are closely related to panic behaviors. In this paper the system is abstracted into a dynamic complex network composed of three types people, namely calm and herding as well their interactions. The mathematical model these interactions established based on theory. Further, evolution people interpreted by specific concept “herding–panic threshold,” its utility threshold model, which own characteristics external pressure from...

After Montreal protocol, more and new materials have been applied as the substitutes of Halon. Much attention has paid to fire extinguishing efficiency alkali metal salts ammonium phosphate salts, but effects particle sizes not studied sufficiently. The fire-extinguishing a kind agent based on magnesium hydroxide different size was in this paper. Four powders used study their fire-suppression through laboratory scale experiments confine space 1*1*1m. physical chemical characteristics were...

In this paper, the buoyancy-controlled jet flames from inclined rectangular nozzles with different aspect ratios have been investigated. The length-to-width of are 1, 2.25, 4, 9, and 16 same cross-sectional area. angles nozzle to horizontal direction 0°, 30°, 60°, 90°. value flame length changes at angle for ratios. A correlation has developed calculate an arbitrary angle.

The merging of pedestrian streams is a common phenomenon in traffic and evacuation. However it prone to stampede can cause immense human economic damage because the unreasonable strategy. This paper establishes bidirectional flow model based on social force study effect ratio branch inflow total evacuation efficiency at T-junction. moving characteristics pedestrian, average speed maximum value density different ratios were acquired. most favorable for was obtained by thorough analysis....

It is important to investigate the influence factors of chlorination system safety since process exposed risk chlorine leakages, fires and explosions, which are easy cause severe casualties. To consider as a complex dynamic system, simulation model about established based on dynamics. Four modules related workers, management, laws (and regulations) equipment, well mutant factor corrosion degree comprehensively integrated. Through implementations series scenarios with different inputs, it...

ABSTRACT Solid phase microextraction‐gas chromatography‐mass spectroscopy technology was used to extract and analyze three kinds of accelerant soot including diesel soot, gasoline diesel–gasoline mixture soot. A total 60 spectrograms have been obtained, analyzed, compared. It found that these were quite different with each other in the difference major target compounds retention time span, could be visually identified by profile corresponding spectrogram. data matrix * 41 reached...

To investigate the impact of Twinning Boundary Spacing (TBS) on mechanical characteristics and deformation behavior nanotwinned Cu–Ag alloys with solute gradient segregation structure during nanoindentation, Voronoi’s method is utilized to create a alloy model structure. Then, indentation process indenter pressed into varying TBS simulated using Molecular Dynamics (MD) simulation, yielding depth-stress curves corresponding indenter. According findings, yield stresses are lower in smaller...

The effects of solute random distribution (RSS) before relaxation and short-range ordering (SRO) after on the mechanical behavior nanocrystalline Cu–Ag alloys were analyzed by molecular dynamics simulation. It has been found that properties alloy mechanics with SRO better than those RSS. Specifically, during whole tensile process, compared sample #1 structure, #2 RSS structure stronger strain–stress response ability, more obvious phase transformation narrower shear strain zone grain...

Abstract This paper shows that the number of cycles and crystal structure play an important role in capacity cycling ability lithium‐ion batteries. However, detailed dynamics continuity decay mechanism caused by need to be further understood at nanoscale. Molecular simulation was used examine microstructure development deformation behavior Si anode electric field. The results show increase leads a large expansion volume electrode, which loss decrease cycle capacity, as well structural...

<title>Abstract</title> Molecular dynamics simulation method has been adopted to scrutinize the reactions of hydrogen atom segregation within grain boundary affect zones a polycrystalline Fe model. The primary focus is discern influence varied concentrations on failure behaviors exhibited during plastic deformation. investigation aims straighten out mechanical characteristics and mechanisms at microscale in iron. Moreover, study monitors analyzes alterations crystal structure iron model...

This paper focuses its attention on the combustion characteristics and fire risk evaluation downward flame spread of polypropylene (PP) polymethyl methacrylate (PMMA). Many characteristic parameters have been measured under different widths samples, including rate, height etc. It is shown that PP PMMA are diversed for pyrolysis mechanism. The width test sample has impact CO emissions during burning period. As increases, rate decreases first, then while PPMA increases monotonically. volume...

The transportation of dangerous goods/hazardous chemicals is a hot issue in the area industrial safety.This paper investigates route optimization for Adipic acid based on fuzzy compromise approach and iterative algorithm, proposing multi-point multi-objective decisionmaking model road routing with minimum risk, cost sensitive population.The three objective functions are integrated weights by path risk decision model.The optimal compromised solution obtained using extended label correcting...