An improved theoretical model for the maximum smoke temperature rise in a tunnel based on equivalent fire source

2022 ◽  
Vol 122 ◽  
pp. 104339
Author(s):  
Shaogang Zhang ◽  
Yanli Shi ◽  
Bin Lin ◽  
Long Shi ◽  
Jiahao Liu ◽  
...  
2011 ◽  
Vol 347-353 ◽  
pp. 3361-3364
Author(s):  
Zhen Wu ◽  
Nyallang Nyamsi Serge ◽  
Ze Wei Bao ◽  
Zao Xiao Zhang

This paper introduces the theoretical model of mechanical alloying. In view of the varied angle in the actual impact process, the Gauss distribution of angle is drawn into the model based on the angle factor. The distribution of temperature rise is obtained and fitted. It accords well with the Gauss distribution in some extent. The results show the thermal effect of powder depends on milling technology, the impact angle and others. Compared with the previous models, the presented model is well in consistent with the fact.


2021 ◽  
Vol 11 (22) ◽  
pp. 10555
Author(s):  
Yao Ma ◽  
Qiang Huang ◽  
Yixin Yu ◽  
Yuan Dong ◽  
Hui Li ◽  
...  

Carbon fiber reinforced polymers (CFRP) are a widely used composite material applied in both commercial and industrial utilization. Based on the heat conduction theory, a theoretical model for the temperature rise of braided CFRP irradiated by long pulse laser is established in this work, and the time required for the maximum temperature rise of CFRP (with different thicknesses) to be acted by long pulse laser with different energy densities and pulse widths is simulated. At the same time, the temperature rise experiment and damage morphology of a long pulse laser with braided CFRP were carried out. The theoretical simulation results are in good agreement with the experimental results, which verifies the correctness of the theoretical model. The results of this paper will provide a theoretical basis for laser processing of CFRP.


Crisis ◽  
2000 ◽  
Vol 21 (2) ◽  
pp. 80-89 ◽  
Author(s):  
Maila Upanne

This study monitored the evolution of psychologists' (n = 31) conceptions of suicide prevention over the 9-year course of the National Suicide Prevention Project in Finland and assessed the feasibility of the theoretical model for analyzing suicide prevention developed in earlier studies [ Upanne, 1999a , b ]. The study was formulated as a retrospective self-assessment where participants compared their earlier descriptions of suicide prevention with their current views. The changes in conceptions were analyzed and interpreted using both the model and the explanations given by the subjects themselves. The analysis proved the model to be a useful framework for revealing the essential features of prevention. The results showed that the freely-formulated ideas on prevention were more comprehensive than those evolved in practical work. Compared to the earlier findings, the conceptions among the group had shifted toward emphasizing a curative approach and the significance of individual risk factors. In particular, greater priority was focused on the acute suicide risk phase as a preventive target. Nonetheless, the overall structure of prevention ideology remained comprehensive and multifactorial, stressing multistage influencing. Promotive aims (protective factors) also remained part of the prevention paradigm. Practical working experiences enhanced the psychologists' sense of the difficulties of suicide prevention as well as their criticism and feeling of powerlessness.


2018 ◽  
Vol 65 (3) ◽  
pp. 346-357 ◽  
Author(s):  
Rachel E. Brenner ◽  
David L. Vogel ◽  
Daniel G. Lannin ◽  
Kelsey E. Engel ◽  
Andrew J. Seidman ◽  
...  

2011 ◽  
Author(s):  
David A. Jones ◽  
Chelsea R. Willness ◽  
Stephan Dilchert

Sign in / Sign up

Export Citation Format

Share Document