Analysis on the Influence Factors of Gas Emission in Eastern 113 Working Face of Dashuitou Mine

2012 ◽  
Vol 616-618 ◽  
pp. 426-430
Author(s):  
Zuo Quan Li ◽  
Yin Shang Wei ◽  
Liang Song Guo
Keyword(s):  
Atmospheric Pressure ◽  
Influencing Factor ◽  
Influence Factors ◽  
Gas Emission ◽  
Atmosphere Pressure ◽  
Working Face ◽  
Sensitive Factor ◽  
Pressure Changes ◽  
The Relationship ◽  
Grey Correlation Theory

There are many factors that affect the gas emission in working face. To predict and prevent this kind of gas emission, the mainly sensitive factor should be filtered and detected from many influencing factors. Taken Dashuitou Mine for an example, the main influencing factor was analyzed by using Grey correlation theory, which was atmosphere pressure. Then, the relationship between atmosphere pressure and gas emission is studied with Statistics tools. It obtained some important conclusions, include the rule of Atmospheric pressure changes in working face during a day, rule of the gas underground changes in a day, rule of correlation statistical, concrete relation between atmospheric pressure and gas emission. It would be useful on disposing of gas emission risk.

Study on the Relationship between Hongmiao Mine Gas Emission and Atmospheric Pressure Change on

2012 ◽  
Vol 524-527 ◽  
pp. 739-742
Author(s):  
Xi Hua Zhou ◽  
Jian Yuan Zhao ◽  
Xian Wei Xu
Keyword(s):  
Coal Mine ◽  
Atmospheric Pressure ◽  
Pressure Change ◽  
Emission Source ◽  
Return Flow ◽  
Gas Emission ◽  
Production Safety ◽  
Mine Gas ◽  
Pressure Changes ◽  
The Relationship

Atmospheric pressure changes on the fully mechanized top-coal caving has very significant effect to gas emission produce, through discussion to the mine gas emission source,and analysis the actual measured data.Get the result:with the rise of the ground atmospheric pressure ,the mine gas emission is absolutely reduced,and gas changes in return flow is after atmospheric pressure changes 0.5-1h later. Summarized measures to the gas emission suddenly increased.To the coal mine has guiding significance for production safety.

Research on Engine-Pump Units Adaptability in the Plateau

2012 ◽  
Vol 614-615 ◽  
pp. 371-375
Author(s):  
Jiang Li ◽  
Wei Ming Zhang ◽  
Tao Li
Keyword(s):  
Atmospheric Pressure ◽  
Influence Factors ◽  
Important Influence ◽  
Performance Parameters ◽  
Natural Conditions ◽  
Fuel Supply ◽  
Supply Capacity ◽  
The Relationship

The efficiency of engine-pump units and fuel supply capacity are related closely, which drop strongly in the plateau. In order to find out the relationship between engine-pump units performance parameters and natural conditions in the plateau, this research dealt with the specific forms of engine-pump units efficiency descend, analyzed the influence factors of engine-pump units efficiency, found out the decline rules of engine-pump units power, emission and reliability. The result shows that atmospheric pressure, temperature and altitude are the most important influence factors, based on the conclusion, some methods were put forward to improve the engine-pump units efficiency.

Measurement and Analysis for Gas Emission Characters in Fully Mechanized Caving Face

2013 ◽  
Vol 353-356 ◽  
pp. 2331-2336
Author(s):  
Xin Jian Li ◽  
Shou Song Guo ◽  
Jun He ◽  
Xiang Fan Mi
Keyword(s):  
Abutment Pressure ◽  
Coal Production ◽  
Coal Face ◽  
Gas Emission ◽  
Obvious Effect ◽  
Gas Concentration ◽  
Working Face ◽  
Measurement And Analysis ◽  
Working Resistance ◽  
The Relationship

According to the practical condition of 3401 fully mechanized caving face in Dayang coal mine, the relationship between strata behaviors, mining technology and stope gas emission are analyzed through real-time monitoring of the support working resistance, advance abutment pressure and gas concentration of working face. It shows that the change of working face abutment pressure has an obvious effect on the regularity of coal face gas emission. The crest value of gas emission falls behind periodic weighting, the lagging time is about one day. Other factors, like coal production processes, daily coal output and advance speed also have close relationships with gas emission.

Atmospheric pressure changes in the Arctic from 1801 to 1920

2012 ◽  
Vol 33 (7) ◽  
pp. 1730-1760 ◽  
Author(s):  
Rajmund Przybylak ◽  
Przemysław Wyszyński ◽  
Zsuzsanna Vízi ◽  
Joanna Jankowska
Keyword(s):  
Atmospheric Pressure ◽  
The Arctic ◽  
Pressure Changes

scholarly journals Comparison of bacterial microleakage of three bioactive endodontic sealers in simulated underwater diving and aviation conditions

2021 ◽  
Vol 21 (1) ◽  
Author(s):  
Mehdi Dastorani ◽  
Behnam Malekpour ◽  
Mohsen AminSobhani ◽  
Mohammadsadegh Alemrajabi ◽  
Arezoo Mahdian ◽  
...  
Keyword(s):  
Atmospheric Pressure ◽  
Mineral Trioxide Aggregate ◽  
In Vitro Study ◽  
Chi Square ◽  
Custom Made ◽  
Single Cone ◽  
Registration Number ◽  
Chi Square Test ◽  
Pressure Changes

Abstract Background Bacterial microleakage is an important cause of apical periodontitis and endodontic treatment failure. This study aimed to assess the bacterial microleakage of nano-mineral trioxide aggregate (nano-MTA) as a sealer, Endoseal MTA, and GuttaFlow Bioseal sealers in atmospheric pressure, and simulated underwater diving and aviation conditions. Methods In this in vitro, experimental study, 180 extracted single-rooted teeth were cleaned and shaped, and were then randomly divided into three groups for single-cone obturation using Endoseal MTA, GuttaFlow Bioseal, or nano-MTA as a sealer. Each group was then randomly divided into three subgroups, and subjected to ambient atmospheric pressure, 2 atm pressure (to simulate underwater diving), and 0.5 atm pressure (to simulate aviation) using a custom-made pressure chamber. The teeth then underwent microbial leakage test using Streptococcus mutans (S. mutans), and the percentage of samples showing microleakage was recorded for up to 1 month, and analyzed using the Chi-square test. Results The three sealer groups were significantly different regarding bacterial microleakage (P < 0.05). The nano-MTA group showed significantly higher microleakage after 15 days than the other two groups (P = 0.006). The effect of pressure on bacterial microleakage was not significant in any sealer group (P > 0.05). Conclusion Within the limitations of this in vitro study, it may be concluded that single-cone obturation technique using nano-MTA as a sealer results in lower resistance to bacterial microleakage compared with the use of GuttaFlow Bioseal, and Endoseal MTA. Pressure changes in simulated underwater diving and aviation conditions had no significant effect on bacterial microleakage. Trial Registration Number This is not a human subject research.

Mechanoreceptor afferent activity compared with receptor field dimensions and pressure changes in feline urinary bladder

1992 ◽  
Vol 70 (11) ◽  
pp. 1457-1467 ◽  
Author(s):  
John W. Downie ◽  
J. Andrew Armour
Keyword(s):  
Contractile Activity ◽  
Bladder Wall ◽  
Afferent Activity ◽  
Intravesical Pressure ◽  
Receptor Field ◽  
Precise Relationship ◽  
Pressure Changes ◽  
The Relationship ◽  
Simple Fashion ◽  
Pressure Receptor

The relationship between vesical mechanoreceptor field dimensions and afferent nerve activity recorded in pelvic plexus nerve filaments was examined in chloralose-anesthetized cats. Orthogonal receptor field dimensions were monitored with piezoelectric ultrasonic crystals. Reflexly generated bladder contractile activity made measurements difficult, therefore data were collected from cats subjected to actual sacral rhizotomy. Afferent activity was episodic and was initiated at different pressure and receptor field dimension thresholds. Maximum afferent activity did not correlate with maximum volume or pressure. Furthermore, activity was not linearly related to intravesical pressure, receptor field dimensions, or calculated wall tension. Pressure–length hysteresis of the receptor fields occurred. The responses of identified afferent units and their associated receptor field dimensions to brief contractions elicited by the ganglion stimulant 1,1-dimethyl-4-phenylpiperazinium iodide (2.5–20 μg i.a.), studied under constant volume or constant pressure conditions, are compatible with bladder mechanoreceptors behaving as tension receptors. Because activity generated by bladder mechanoreceptors did not correlate in a simple fashion with intravesical pressure or receptor field dimensions, it is concluded that such receptors are influenced by the viscoelastic properties of the bladder wall. Furthermore, as a result of the heterogeneity of the bladder wall, receptor field tension appears to offer a more precise relationship with the activity of bladder wall mechanoreceptors than does intravesical pressure.Key words: bladder distension, intravesical pressure, sacral rhizotomy, viscoelasticity.

The Impact of Rural Finance on Rural Economic Development from the Perspective of Efficiency of Discrete Differential Algorithm

2021 ◽  
Vol 7 (5) ◽  
pp. 4358-4365
Author(s):  
Mingxu Peng ◽  
Jiawen Huang
Keyword(s):  
Economic Growth ◽  
Rural Economy ◽  
Choice Model ◽  
Influence Factors ◽  
Maximum Flow ◽  
Pso Algorithm ◽  
Significant Degree ◽  
Theoretical Research ◽  
The Impact ◽  
The Relationship

Objectives: Finance is the core of the national economy. The development of modern rural economy is inseparable from financial support. The relationship between finance and economic growth has always been one of the hot topics in theoretical research and empirical analysis. Methods: Under the background of the development of Internet e-commerce, the maximum flow algorithm was based on the empirical research on the relationship between China’s financial development and economic growth. Results: Based on this, the two-element discrete choice model of Probit and Logistic for economic growth was constructed. Discrete particle swarm optimization (PSO) algorithm was used to estimate the parameters of the model. The significant degree of the influence factors was calculated. Conclusion: Finally, it was calculated that concurrent business was the decisive factor of economic growth.

scholarly journals Atmospheric Pressure Changes

Nature ◽  
1946 ◽  
Vol 158 (4025) ◽  
pp. 914-914
Author(s):  
C. H. B. PRIESTLEY
Keyword(s):  
Atmospheric Pressure ◽  
Pressure Changes

scholarly journals Analysis of Stress and Strain to Determine the Pressure Changes in Tight-Fitting Garment

2020 ◽  
Vol 20 (1) ◽  
pp. 49-55
Author(s):  
Nareerut Jariyapunya ◽  
Blažena Musilová
Keyword(s):  
Mechanical Properties ◽  
Mathematical Models ◽  
Initial Phase ◽  
Circumferential Stress ◽  
The Body ◽  
Stress And Strain ◽  
Laplace’S Law ◽  
Pressure Changes ◽  
The Relationship ◽  
Laplace's Law

AbstractBased on the mechanical properties of stretch fabrics and Laplace’s law, the mathematical models have been developed enabling one to determine the values of the relationship between the fabric strain and the circumferential stress depending on pressure and diameter of the body. The results obtained refer to the values of the parameters assessed for the initial phase of their exploitation, which allow us to preliminarily predict the values of these parameters.

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