scholarly journals Experimental Research on Rapid Fire Zone Sealing and Explosion Venting Characteristics of an Explosion Venting Door Using a Large-Diameter Explosion Pipeline

ACS Omega ◽  
2021 ◽  
Author(s):  
Ang Li ◽  
Junhong Si ◽  
Xihua Zhou
Keyword(s):  
Experimental Research ◽  
Large Diameter ◽  
Fire Zone

scholarly journals Experimental research of thermohydraulic dispatcher operating regimes

2019 ◽  
Vol 12 (2) ◽  
pp. 106-112 ◽  
Author(s):  
D. O. Romanov ◽  
Y. V. Yavorovsky ◽  
V. V. Smirnov
Keyword(s):  
Experimental Research ◽  
Large Diameter ◽  
Electric Energy ◽  
District Heating ◽  
Primary Circuit ◽  
Energy Saving Potential ◽  
Insufficient Amount ◽  
Mixing Regime ◽  
Low Hydraulic Resistance ◽  
Operating Regimes

Heat carrier transportation in district heating (DH) systems is an issue of a significant energy saving potential. This potential can be achieved by applying a thermohydraulic dispatcher (THD) into DH systems. THD is a vertical or horizontal shunt pipe of a large diameter with relatively low hydraulic resistance in comparison with that of connected circuits. Installation of THD along with distributed variable speed pumps in DH systems can lead to reducing or even eliminating electric energy losses caused by throttling of redundant hydraulic head. It also leads to decreasing pressure in heat supply network which improves reliability of the network. But the opportunity of further rational implementation of THD in DH systems is limited because of insufficient amount of theoretical and experimental research. This paper is concerned with the experimental research of THD operating regimes. Already known aspects of THD operation were checked and proved. New dependencies were obtained for bypassing regime and for mixing regime of THD. Besides, different types of the primary circuit connection to THD were considered: connection for non-condensing boilers and connection for condensing boilers. Simplified models describing bypassing and mixing regimes of THD were proposed. It is possible to estimate return temperature of primary circuit with the help of the bypassing regime model with an error less than 1%. At the same time the mixing regime model is suitable for finding supply temperatures of primary circuits with an error less than 2%.The results of this paper can be used for further research and development of DH systems with THD. Such systems could be traditional as well as prospective ones (low temperature and pressure DH systems). 

Experimental Research of Uniaxial Compression Bearing Capacity on Large Diameter CFST Columns

2013 ◽  
Vol 540 ◽  
pp. 107-118
Author(s):  
Xiao Qiang Ren ◽  
Yan Jiang Chen ◽  
Wei Ming Yan ◽  
Da Peng Gu ◽  
Jin Jie Wang
Keyword(s):  
Bearing Capacity ◽  
Experimental Research ◽  
Large Diameter ◽  
Axial Loading ◽  
Reduction Factor ◽  
Steel Tubes ◽  
Maximum Capacity ◽  
Large Size ◽  
The Difference ◽  
Cfst Columns

This paper focused on the uniaxial ultimate-bearing-capacity of large size concrete filled steel tubular (CFST) columns. Two aspects were investigated experimentally. To verify the feasibility of similarity principles for large size components, a series of uniaxial compressive experiments were conducted using different scaled specimens, the prototype of which is a CFST arch rib in an authentic arch bridge. Meanwhile, two specimens with same scale were tested axially and eccentrically to investigate the difference of bearing capacity resulted from the pierced-column. The experimental results show that the size effect on the bearing capacity of the rib is so insignificant that the scaled specimen can be used to obtain the maximum capacity of the full-scale component. The inserted steel tubes in the middle of the column cause the reduction of its capacity and the reduction factor from axial loading is bigger than that from bias load. Moreover, the eccentricity reduces the effect of piercing on the capacity of CFST column.

Development of a digital SEM

1991 ◽  
Vol 49 ◽  
pp. 358-359
Author(s):  
A. Yamada ◽  
A. Shibano ◽  
K. Harasawa ◽  
T. Kobayashi ◽  
H. Fukuda ◽  
...  
Keyword(s):  
Large Diameter ◽  
Objective Lens ◽  
Large Specimen ◽  
Backscattered Electrons ◽  
Digital Scanning ◽  
Junction Type ◽  
High Resolution Images ◽  
Working Distance ◽  
Type Detector ◽  
Short Working

A newly developed digital scanning electron microscope, the JSM-6300, has the following features: Equipped with a narrower conical objective lens (OL), it allows high resolution images to be obtained easily at a short working distance (WD) and a large specimen tilt angle. In addition, it is provided with automatic functions and digital image processing functions for ease of operation.Conical C-F lens: The newly developed conical C-F objective lens, having low aberration characteristics over a wide WD range, allows a large-diameter (3-inch) specimen to be tilted up to 60° at short WD, and provides images with low magnifications starting at 10*. On the bottom of the lens, a p n junction type detector is provided to detect backscattered electrons (BE) from the specimen. As the narrower conical 0L increases the secondary electron (SE) detector's field intensity on the specimen surface, high SE image quality is obtained.

Secondary Transfer Effect of Contact

2009 ◽  
Vol 40 (2) ◽  
pp. 55-65 ◽  
Author(s):  
Thomas F. Pettigrew
Keyword(s):  
Cognitive Dissonance ◽  
Experimental Research ◽  
Intergroup Contact ◽  
Transfer Effect ◽  
Evaluative Conditioning ◽  
Transfer Effects ◽  
Secondary Transfer ◽  
Primary Reduction

This paper reviews the evidence for a secondary transfer effect of intergroup contact. Following a contact’s typical primary reduction in prejudice toward the outgroup involved in the contact, this effect involves a further, secondary reduction in prejudice toward noninvolved outgroups. Employing longitudinal German probability samples, we found that significant secondary transfer effects of intergroup contact exist, but they were limited to specific outgroups that are similar to the contacted outgroup in perceived stereotypes, status or stigma. Since the contact-prejudice link is bidirectional, the effect is inflated when prior prejudice reducing contact is not controlled. The strongest evidence derives from experimental research. Both cognitive (dissonance) and affective (evaluative conditioning) explanations for the effect are offered.

Review of Foundations of Experimental Research. 3rd ed.

1983 ◽  
Vol 28 (10) ◽  
pp. 805-805
Author(s):  
Roger E. Kirk
Keyword(s):  
Experimental Research
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