The Experts below are selected from a list of 89859 Experts worldwide ranked by ideXlab platform
S U Zifan - One of the best experts on this subject based on the ideXlab platform.
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value of low Pressure Pulse air enema to treat pediatric intussusceptions
Hainan Medical Journal, 2011Co-Authors: S U ZifanAbstract:Objective To investigate the clinical value of low Pressure Pulse air enema to treat pediatric intus-susception with different Pressure in different age,and to improve the safety and success ratio in intussusception reduc-tion.Methods 103 cases with pediatric intussusceptions were treated by compute remote control device enema(JS-818) and divided into the control group and the observation group,and the observation group were further divided into A group and B group.The A group had 26 cases with the age below 6 months and the B group had 51 cases with the age more than 7 months,while the control group had 26 cases with the age above 8 months.And the data in differ-ent groups were analyzed to observe untoward effect,treatment effect and correlative factors.Results 74 cases suc-ceed,3 cases failed,with the reduction rate of 96.10% in the observation group,while 21 cases succeed and 5 cases failed,with the reduction rate of 80.76% in the control group.There is no statistically significant difference of the re-duction rate in different groups,but the discrepancy had statistically significant difference(P0.05) in untoward effect.There is no intestinal perforation and death in the operation.Conclusion Low Pressure Pulse air enema had signifi-cant reduction effectiveness on pediatric intussusceptions in different groups,with the safety.
Quanqi Shi - One of the best experts on this subject based on the ideXlab platform.
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solar wind Pressure Pulse driven magnetospheric vortices and their global consequences
Journal of Geophysical Research, 2014Co-Authors: Quanqi Shi, M D Hartinger, V Angelopoulos, Anmin Tian, Qiugang Zong, J M Weygand, J Raeder, X Z Zhou, M W DunlopAbstract:We report the in situ observation of a plasma vortex induced by a solar wind dynamic Pressure enhancement in the nightside plasma sheet using multipoint measurements from Time History of Events and Macroscale Interactions during Substorms (THEMIS) satellites. The vortex has a scale of 5–10 Re and propagates several Re downtail, expanding while propagating. The features of the vortex are consistent with the prediction of the Sibeck (1990) model, and the vortex can penetrate deep (~8 Re) in the dawn-dusk direction and couple to field line oscillations. Global magnetohydrodynamics simulations are carried out, and it is found that the simulation and observations are consistent with each other. Data from THEMIS ground magnetometer stations indicate a poleward propagating vortex in the ionosphere, with a rotational sense consistent with the existence of the vortex observed in the magnetotail.
L R Lyons - One of the best experts on this subject based on the ideXlab platform.
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the effect of the january 10 1997 Pressure Pulse on the magnetosphere ionosphere current system
Geophysical monograph, 2013Co-Authors: E Zesta, L R Lyons, H J Singer, D Lummerzheim, C T Russell, M BrittnacherAbstract:On January 10, 1997, a strong Pressure Pulse, observed by the WIND spacecraft between 1030 and 1055 UT, hit the magnetosphere after about a one-half hour delay, causing the strengthening and widening of the auroral electrojet at all local times. The duration of the electrojet perturbation was the same as the duration of the solar wind Pressure Pulse. The Pulse occurred during the well-studied January 10-11, 1997, magnetic storm and during strong geomagnetic activity. We study the effect of the Pressure Pulse on the ionospheric current using a global network of more than 100 ground magnetometers, images from the POLAR spacecraft, and solar wind measurements from the WIND and Geotail spacecraft. We find that the magnetospheric and ionospheric response is directly driven by the solar wind conditions and clearly related to the onset, duration and end of the Pressure Pulse. In addition, it appears that the enhancement of the Region 1 currents opposed the effect of the enhancement of the magnetopause current for locations near noon. These responses are not characteristics of a typical substorm.
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geosynchronous magnetic field response to solar wind dynamic Pressure Pulse
Journal of Geophysical Research, 2004Co-Authors: L R LyonsAbstract:The present study examines the morning-afternoon asymmetry of the geosynchronous magnetic field strength on the dayside (magnetic local time [MLT] = 06:00~18:00) using observations by the Geostationary Operational Environmental Satellites (GOES) over a period of 9 years from February 1998 to January 2007. During geomagnetically quiet time (Kp < 3), we observed that a peak of the magnetic field strength is skewed toward the earlier local times (11:07~11:37 MLT) with respect to local noon and that the geosynchronous field strength is larger in the morning sector than in the afternoon sector. That is, there is the morning-afternoon asymmetry of the geosynchronous magnetic field strength. Using solar wind data, it is confirmed that the morning-afternoon asymmetry is not associated with the aberration effect due to the orbital motion of the Earth about the Sun. We found that the peak location of the magnetic field strength is shifted to ward the earlier local times as the ratio of the magnetic field strength at MLT = 18 (B-dusk) to the magnetic field strength at MLT = 06 (B-dawn) is decreasing. It is also found that the dawn-dusk magnetic field median ratio, B-dusk/B-dawn, is decreasing as the solar wind dynamic Pressure is increasing. The morning-afternoon asymmetry of the magnetic field strength appears in Tsyganenko geomagnetic field model (TS-04 model) when the partial ring current is included in TS04 model. Unlike our observations, however, TS-04 model shows that the peak location of the magnetic field strength is shifted toward local noon as the solar wind dynamic Pressure grows in magnitude. This may be due to that the symmetric magnetic field associated with the magnetopause current, strongly affected by the solar wind dynamic Pressure, increases. However, the partial ring current is not affected as much as the magnetopause current by the solar wind dynamic Pressure in TS-04 model. Thus, our observations suggest that the contribution of the partial ring current at geosynchronous orbit is much larger than that expected from TS-04 model as the solar wind dynamic Pressure increases.
S. Merce - One of the best experts on this subject based on the ideXlab platform.
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Assessment of relationships between blood Pressure, Pulse wave velocity and digital volume Pulse
2006 Computers in Cardiology, 2006Co-Authors: J. M. Padilla, E. J. Berjano, Javier Saiz, L. Facila, P Diaz, S. MerceAbstract:Aortic arterial stiffness is an independent predictor of cardiovascular risk. Pulse wave velocity (PWV) is the most validated and universally accepted measure of arterial stiffness. The Digital Volume Pulse (DVP) is an accurate and non invasive method to obtain information on the Pressure Pulse waveform, and provides two indexes: stiffness index (SIDVP) which relates with large artery stiffness, and the reflection index (RIDVP) which relates with vascular tone. SIDVP has been previously correlated with cfPWV (carotid-femoral PWV), however, the inguinal location of the employed transducer provokes a strong psychological impact on the patients, which may reduce reproducibility. By contrast, measurement of abPWV (ankle-brachial Pulse wave velocity) minimizes this psychological stress. Our aim was to evaluate the relationship among blood Pressure parameters and abPWV; and the relationship among abPWV, SIDVP and RIDVP in health subjects.
M W Dunlop - One of the best experts on this subject based on the ideXlab platform.
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solar wind Pressure Pulse driven magnetospheric vortices and their global consequences
Journal of Geophysical Research, 2014Co-Authors: Quanqi Shi, M D Hartinger, V Angelopoulos, Anmin Tian, Qiugang Zong, J M Weygand, J Raeder, X Z Zhou, M W DunlopAbstract:We report the in situ observation of a plasma vortex induced by a solar wind dynamic Pressure enhancement in the nightside plasma sheet using multipoint measurements from Time History of Events and Macroscale Interactions during Substorms (THEMIS) satellites. The vortex has a scale of 5–10 Re and propagates several Re downtail, expanding while propagating. The features of the vortex are consistent with the prediction of the Sibeck (1990) model, and the vortex can penetrate deep (~8 Re) in the dawn-dusk direction and couple to field line oscillations. Global magnetohydrodynamics simulations are carried out, and it is found that the simulation and observations are consistent with each other. Data from THEMIS ground magnetometer stations indicate a poleward propagating vortex in the ionosphere, with a rotational sense consistent with the existence of the vortex observed in the magnetotail.
