Low Pressure System and Blood Volume Regulating Hormones after Prolonged Exercise

1975 ◽  
pp. 315-321 ◽  
Author(s):  
K. Kirsch ◽  
W.-D. Risch ◽  
U. Mund ◽  
L. Röcker ◽  
H. Stosoy
Keyword(s):  
Blood Volume ◽  
Prolonged Exercise ◽  
Low Pressure ◽  
Pressure System ◽  
Low Pressure System

The role of afferents from the low-pressure system in the release of antidiuretic hormone during non-hypotensive hemorrhage

1968 ◽  
Vol 46 (2) ◽  
pp. 287-295 ◽  
Author(s):  
J. P. Henry ◽  
P. D. Gupta ◽  
J. P. Meehan ◽  
R. Sinclair ◽  
L. Share
Keyword(s):  
Blood Volume ◽  
Low Pressure ◽  
Systemic Circulation ◽  
Pressure System ◽  
Sharp Drop ◽  
Stretch Receptors ◽  
Femoral Vessels ◽  
Low Pressure System ◽  
Fluid Volume Regulation

Moderate hemorrhage insufficient to reduce seriously the pulse pressure, had no effect on the total flow of afferent impulses per unit time from stretch receptors of the high-pressure system (systemic circulation). However, it sharply reduced the flow from the atrial receptors of the low-pressure system (lesser circulation). Thus acute non-hypotensive blood volume loss permits a differentiation between the effects of the stretch receptors in the two divisions of the cardiovascular system. Eleven conscious animals were trained to lie quietly with catheters in the femoral vessels. The loss of no more than 10–20% of the estimated blood volume led to a sharp drop in atrial stretch receptor firing. Measurements of blood ADH showed variable increases which in most cases were to significant levels. Other aspects of cardiovascular and fluid volume regulation were affected by changes in firing of stretch receptors in the low-pressure system. They include the tachycardia of non-hypotensive hemorrhage and changes in kidney function with atrial distension.

Estimation of Design Parameters and Performance for a State-of-the-Art Turbofan

2021 ◽  
Author(s):  
Oliver Sjögren ◽  
Carlos Xisto ◽  
Tomas Grönstedt
Keyword(s):  
Performance Metrics ◽  
State Of The Art ◽  
Low Pressure ◽  
Performance Model ◽  
Cycle Performance ◽  
Civil Aviation ◽  
Design Parameters ◽  
Pressure System ◽  
Public Data ◽  
Low Pressure System

Abstract The aim of this study is to explore the possibility of matching a cycle performance model to public data on a state-of-the-art commercial aircraft engine (GEnx-1B). The study is focused on obtaining valuable information on figure of merits for the technology level of the low-pressure system and associated uncertainties. It is therefore directed more specifically towards the fan and low-pressure turbine efficiencies, the Mach number at the fan-face, the distribution of power between the core and the bypass stream as well as the fan pressure ratio. Available cycle performance data have been extracted from the engine emission databank provided by the International Civil Aviation Organization (ICAO), type certificate datasheets from the European Union Aviation Safety Agency (EASA) and the Federal Aviation Administration (FAA), as well as publicly available data from engine manufacturer. Uncertainties in the available source data are estimated and randomly sampled to generate inputs for a model matching procedure. The results show that fuel performance can be estimated with some degree of confidence. However, the study also indicates that a high degree of uncertainty is expected in the prediction of key low-pressure system performance metrics, when relying solely on publicly available data. This outcome highlights the importance of statistic-based methods as a support tool for the inverse design procedures. It also provides a better understanding on the limitations of conventional thermodynamic matching procedures, and the need to complement with methods that take into account conceptual design, cost and fuel burn.

The effect of vasoactive drugs on the low-pressure system

1978 ◽  
Vol 73 (2) ◽  
pp. 220-229 ◽  
Author(s):  
K. Kirsch ◽  
A. Ameln ◽  
H. J. Wicke
Keyword(s):  
Low Pressure ◽  
Vasoactive Drugs ◽  
Pressure System ◽  
Low Pressure System

scholarly journals Synoptic perspectives on pollutant transport patterns observed by satellites over East Asia: Case studies with a conceptual model

2016 ◽  
Author(s):  
Hyun Cheol Kim ◽  
Soontae Kim ◽  
Seok-Woo Son ◽  
Pius Lee ◽  
Chun-Sil Jin ◽  
...  
Keyword(s):  
High Pressure ◽  
East Asia ◽  
Southern China ◽  
Low Pressure ◽  
Pressure System ◽  
Weather Patterns ◽  
High Pressure System ◽  
Synoptic Weather ◽  
Low Pressure System ◽  
Transport Patterns

Abstract. We demonstrate that daily pollutant transport patterns in East Asia are visible from satellite images when inspected with corresponding synoptic weather analyses. Transport pathways of air pollutants in East Asia are investigated using satellite observations, surface weather charts, and chemical-transport model simulations. It is found that during cool season (fall to spring), pollutant transports in East Asia are largely determined by synoptic weather patterns associated with high pressure system over southern China, which is extended from the Siberia High, and low pressure system over Manchuria, which is initiated by Altai-Sayan cyclogenesis. Based on the relative location and strength of these weather systems, three types of synoptic weather patterns that may contribute to pollutants transport in East Asia, especially in China and Korea, are identified: i.e., (1) a strengthening of the Siberian High and its southeastward propagation; (2) a high-pressure system over southern China followed by a frontal passage associated with a northern low-pressure system; and (3) a stagnant high-pressure system over southern China. For all three patterns, the high-pressure system in southern China is essential for the development of regional air pollution, while frontal activities associated with low-pressure system provide a forcing mechanism to transport those pollutants eastward or southeastward. Observed and simulated surface PM distributions show good agreement in both aerosol optical depth and NO2 column density further implying that anthropogenic emissions also contribute to regional events of high surface PM concentrations. It is argued that the quasi-periodic migration of synoptic weather systems in East Asia works as an efficient pump of pollutants; i.e., regional air pollutions developed under high-pressure systems are transported downstream by low-pressure systems.

Synoptic and Mesoscale Background of the Disastrous Heavy Rainfall in Sri Lanka Caused by a Low Pressure System

2021 ◽  
pp. 407-416
Author(s):  
A. R. P. Warnasooriya ◽  
K. H. M. S. Premalal ◽  
A. W. S. J. Kumara ◽  
Chathuska G. Premachandra
Keyword(s):  
Sri Lanka ◽  
Heavy Rainfall ◽  
Low Pressure ◽  
Pressure System ◽  
Low Pressure System

scholarly journals HINDCASTING OF SURGE AND WAVE ON HOKKAIDO COASTS BY WINTER LOW PRESSURE SYSTEM USING SURGE-WAVE COUPLED SEA BOTTOM AND SURFACE STRESSES IN SUWAT

2018 ◽  
pp. 74
Author(s):  
Kenzo Kumagai ◽  
Sooyoul Kim ◽  
Daiki Tsujio ◽  
Mase Hajime ◽  
Takahito Tsuji
Keyword(s):  
Storm Surge ◽  
Low Pressure ◽  
Wave Generation ◽  
Pressure System ◽  
Surface Stresses ◽  
Sea Bottom ◽  
Low Pressure System

Typhoon-induced storm surge can cause catastrophic consequences in low-lying city areas on coasts. From the historical observations, it is found that Winter Low Pressure System (WLPS) has impacts similar to a typhoon in terms of surge and wave generation. For instance, from 16th to 17th in December 2014, a winter low pressure system of 951 hPa occurred in Hokkaido, Japan, generated a surge of 1.75 m high and flooded many low-lying regions on the Kushiro coast. This was the record-break surge level due to WLPS in Japan, since the WLPS-induced surge of 0.9 m was recorded in 1994.

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