Experimental and Modeling Study of Atmospheric Pressure Effects on Ignition of Pine Wood at Different Altitudes

2010 ◽  
Vol 24 (1) ◽  
pp. 609-615 ◽  
Author(s):  
Jiakun Dai ◽  
Lizhong Yang ◽  
Xiaodong Zhou ◽  
Yafei Wang ◽  
Yupeng Zhou ◽  
...  
Keyword(s):  
Atmospheric Pressure ◽  
Pressure Effects ◽  
Pine Wood ◽  
Different Altitudes ◽  
Modeling Study

scholarly journals Analysis of long-term observations of the groundwater level In an aseismic region

2019 ◽  
pp. 47-67
Author(s):  
A. A. Lyubushin ◽  
O. S. Kazantseva ◽  
A. B. Manukin
Keyword(s):  
Time Series ◽  
Groundwater Level ◽  
Atmospheric Pressure ◽  
Active Regions ◽  
Sampling Interval ◽  
Pressure Effects ◽  
Adaptive Compensation ◽  
Groundwater Level Fluctuations ◽  
And Cluster Analysis

The results of the analysis of continuous precise time series of atmospheric pressure and groundwater level fluctuations in a well drilled to a depth of 400 m in the territory of Moscow are presented. The observations are remarkable in terms of their duration of more than 22 years (from February 2, 1993 to April 4, 2015) and by the sampling interval of 10 min. These long observations are suitable for exploring the stationarity of the properties of hydrogeological time series in a seismically quiet region, which is important from the methodological standpoint for interpreting the similar observations in seismically active regions aimed at earthquake prediction. Factor and cluster analysis applied to the sequence of multivariate vectors ofthe statistical properties of groundwater level time series in the successive 10-day windows after adaptive compensation for atmospheric pressure effects distinguish five different statistically significant states of the time series with the transitions between them. An attempt to geophysically interpret the revealed states is made. Two significant periods – 46 and 275 days – are established by spectral analysis of the sequence of the transitions times between the clusters.

Wavelet filter analysis of local atmospheric pressure effects on gravity variations

2005 ◽  
Vol 79 (8) ◽  
pp. 447-459 ◽  
Author(s):  
X.-G Hu ◽  
L.-T Liu ◽  
J. Hinderer ◽  
H.-P Sun
Keyword(s):  
Atmospheric Pressure ◽  
Pressure Effects ◽  
Wavelet Filter ◽  
Gravity Variations ◽  
Filter Analysis

Experimental and Modeling Study of the Stability of the Atmospheric Pressure Plasma Jet

2007 ◽  
Author(s):  
Alexandre V. Chirokov ◽  
Shailesh P. Gangoli ◽  
Alexander A. Fridman ◽  
Alexander. F. Gutsol ◽  
Alexander Dolgopolsky ◽  
...  
Keyword(s):  
Atmospheric Pressure ◽  
Atmospheric Pressure Plasma ◽  
Plasma Jet ◽  
Atmospheric Pressure Plasma Jet ◽  
Pressure Plasma ◽  
The Stability ◽  
Modeling Study

Experimental and modeling study of the oxidation of acetaldehyde in an atmospheric-pressure pulsed corona discharge

2012 ◽  
Vol 21 (4) ◽  
pp. 045001 ◽  
Author(s):  
C Klett ◽  
S Touchard ◽  
A Vega-Gonzalez ◽  
M Redolfi ◽  
X Bonnin ◽  
...  
Keyword(s):  
Corona Discharge ◽  
Atmospheric Pressure ◽  
Pulsed Corona Discharge ◽  
Pulsed Corona ◽  
Modeling Study

Atmospheric Pressure Effects on Glucose Monitoring Devices

Diabetes Care ◽  
1995 ◽  
Vol 18 (3) ◽  
pp. 423-424 ◽  
Author(s):  
E. H. Piepmeier ◽  
C. Hammett-Stabler ◽  
M. E. Price ◽  
G. B. Kemper ◽  
M. G. Davis
Keyword(s):  
Atmospheric Pressure ◽  
Glucose Monitoring ◽  
Pressure Effects ◽  
Monitoring Devices

scholarly journals The Determination of Pressure Drop of Filter Rods and Nozzles under Different Atmospheric Pressure Conditions/Messung des Zugwiderstandes von Filterstäben und Düsen unter verschiedenen Luftdruckbedingungen

1969 ◽  
Vol 5 (1) ◽  
pp. 28-33
Author(s):  
E. Erxleben ◽  
A. Vorwerk
Keyword(s):  
Pressure Drop ◽  
Atmospheric Pressure ◽  
External Pressure ◽  
Considerable Degree ◽  
Reference Mark ◽  
Measuring Range ◽  
Standard Pressure ◽  
Air Circulation ◽  
Different Altitudes

AbstractThe relations between the pressure drop values of filter rods and nozzles obtained by customary gauges and the atmospheric pressure are investigated. Measurements are carried out between 500 and 1.000 mm Hg external pressure. This range was produced artificially. In case of filter rods it is shown, that a variation of 4 % only is received on the full measuring range by operating at constant air circulation (cm3/s) independent of atmospheric pressure. This shift is negligible in view of normally occurring local variations of atmospheric pressure. By operating at constant air circulation (cm3/s) the value of the nozzles' pressure drop varies in considerable degree over the full measuring range. Using reference nozzles for devices of pressure drop determination at different altitudes therefore, either a correction of the reference mark fixed at a standard pressure is necessary, or the values for filter pressure drop are to be corrected. The corrections are indicated.

Use of Partial Molar Volumes of Model Compounds in the Interpretation of High-Pressure Effects on Proteins

1996 ◽  
Author(s):  
Kenneth E. Prehoda ◽  
John L. Markley
Keyword(s):  
Volume Change ◽  
Atmospheric Pressure ◽  
Protein Unfolding ◽  
Partial Molar Volumes ◽  
Bulk Water ◽  
Pressure Effects ◽  
Molar Volumes ◽  
Positive Term ◽  
Full Characterization ◽  
The Difference

The transfer of liquid hydrocarbons into water is accompanied by a large decrease in volume at 25 °C and atmospheric pressure, with typical values for ΔV°tr of — 2.0 ml mol methylene−1. Considering the large amount of apolar surface that is exposed when a globular protein unfolds, the hydrocarbon transfer results imply that the change in volume accompanying the unfolding process (ΔV°obs) should be highly negative under these conditions. However, experimental data on the pressure denaturation of proteins typically yield relatively small values of ΔV°obs at atmospheric pressure and 25 °C. We analyze this apparent inconsistency in terms of a simple thermodynamic dissection of the partial molar volume. This approach allows the volume effects that result from solute-solvent interactions to be determined from experimental partial molar volumes. The use of absolute quantities (partial molar volumes) circumvents assumptions associated with the use of results from transfer experiments. An important finding is that hydration of apolar species is less dense than bulk water. This discovery leads to the conclusion that the contribution to ΔV°obs for protein unfolding from the hydration of apolar surfaces is highly positive, contrary to predictions based on transfer data. Further, hydration of polar surfaces makes a positive contribution to ΔV°obs. The large, positive term from the differential hydration of the folded and unfolded states is compensated by the difference in free volume of the protein in the two states. This finding provides a new framework for interpreting pressure effects on macromolecules. The full characterization of a macromolecular system requires knowledge of the effect of pressure on the system. The thermodynamic information obtained from using pressure as a perturbation is a volume change for the particular reaction being studied. The observed volume change, ΔV°obs, for protein unfolding may provide insight into the mechanisms that determine the three-dimensional structure of the folded state. Pressure denaturation experiments have been demonstrated for a number of proteins, including ribonuclease A (Gill & Glogovsky, 1965; Brandts et al., 1970), chymotrypsinogen (Hawley, 1971), metmyoglobin (Zipp & Kauzmann, 1973), and, more recently, lysozyme (Samarasinghe et al., 1992) and staphylococcal nuclease (Royer et al., 1993).

Experimental and kinetic modeling study of sooting atmospheric-pressure cyclohexane flame

2009 ◽  
Vol 32 (1) ◽  
pp. 585-591 ◽  
Author(s):  
A. Ciajolo ◽  
A. Tregrossi ◽  
M. Mallardo ◽  
T. Faravelli ◽  
E. Ranzi
Keyword(s):  
Kinetic Modeling ◽  
Atmospheric Pressure ◽  
Modeling Study
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