Surface Pressure Control of Phospholipid Monolayers at the Water/1,2-Dichloroethane Interface

Langmuir ◽  
1998 ◽  
Vol 14 (2) ◽  
pp. 556-559 ◽  
Author(s):  
Desiré Grandell ◽  
Lasse Murtomäki
Keyword(s):  
Surface Pressure ◽  
Pressure Control ◽  
Phospholipid Monolayers

The Liquid Surface Pressure Control System for Low Pressure Die Casting Based on Fuzzy PID

2013 ◽  
Vol 706-708 ◽  
pp. 1063-1067
Author(s):  
Hai Feng Lin ◽  
Liu Qing Du ◽  
Li Ping Xiong
Keyword(s):  
Control System ◽  
Surface Pressure ◽  
Liquid Surface ◽  
Die Casting ◽  
Pressure Control ◽  
Low Pressure ◽  
Fuzzy Pid ◽  
Low Pressure Die Casting ◽  
Pressure Control System ◽  
Pressure Die Casting

The Liquid Surface Pressure Control is the key factor for the guarantee of Low Pressure Die Casting Quality. Regarding to the disadvantages of conventional PID Control such as pressure fluctuation, poor repeatability of the pressure curve, and so on, we propose Liquid Surface Pressure Control System (LSPCS) based on Fuzzy Adaptive PID. Design method of Fuzzy PID Controller has been discussed, and the realization methods of the hardware and software in this system are developed. This proposed system has a good performance in practice.

Effects of air mattress pressure on sleep quality and physiological responses: comparison of shoulder and hip pressure relief

2021 ◽  
Vol ahead-of-print (ahead-of-print) ◽  
Author(s):  
Yoon Jeong Baek ◽  
Seung-Hyun Kim ◽  
Sayup Kim ◽  
Eui-Sang Yoo ◽  
Joo-Young Lee
Keyword(s):  
Sleep Quality ◽  
Surface Pressure ◽  
Pressure Control ◽  
Body Region ◽  
High Quality ◽  
Pressure Relief ◽  
Content Type ◽  
Quality Sleep ◽  
Improve Sleep Quality

PurposeThe purpose of the present study was to evaluate the effect of air mattress pressure on sleep quality.Design/methodology/approachTen young healthy males participated in all hard surface [AH], shoulder soft [SS] and shoulder and hip soft mattress [SHS] conditions. The surface pressure for SS and SHS were set at their preferred levels.FindingsThe results showed that sleep efficiencies were over 95% for all the three conditions; there were no significant differences in individual sleep variables among the three conditions, but overall sleep quality was better for SS than AH (p = 0.065); heart rates during sleep was greater for AH than the other two conditions (p < 0.1); and a stronger relationship between clothing and bed microclimate humidity were found for SS and SHS than that for AH.Research limitations/implicationsThese results indicated that the both pressure relief air mattresses that were set at their own preferred levels provided high quality sleep with no marked differences.Practical implicationsAir pressure relief mattresses can improve sleep quality of healthy individuals during sleep at night. The results can be used to understand appropriate pressure distribution on surface mattress according to body region, and also to develop algorithms to provide optimum sleep using mattresses with surface pressure control by body region.Originality/valueThe present study found that the shoulder and/or hip pressure relief air mattresses that were set at their own preferred levels provided high quality sleep with no marked differences.

Formation and deposition of super-monomolecular layers by means of surface pressure control

1985 ◽  
Vol 133 (1-4) ◽  
pp. 175-180 ◽  
Author(s):  
Yasujiro Kawabata ◽  
Tatsuo Sekiguchi ◽  
Motoo Tanaka ◽  
Takayoshi Nakamura ◽  
Hideo Komizu ◽  
...  
Keyword(s):  
Surface Pressure ◽  
Pressure Control ◽  
Monomolecular Layers

Formation of organic heterostructures into p-n heterojunctions by surface pressure control

1988 ◽  
Vol 160 (1-2) ◽  
pp. 165-170 ◽  
Author(s):  
Mitsuru Yoneyama ◽  
Takumi Nagao ◽  
Konoe Miura
Keyword(s):  
Surface Pressure ◽  
Pressure Control

Dependence of the Activity of Phospholipase Cβ on Surface Pressure and Surface Composition in Phospholipid Monolayers and Its Implications for Their Regulation†

Biochemistry ◽  
1997 ◽  
Vol 36 (4) ◽  
pp. 848-855 ◽  
Author(s):  
Stephen R. James ◽  
Andrew Paterson ◽  
T. Kendall Harden ◽  
Rudy A. Demel ◽  
C. Peter Downes
Keyword(s):  
Surface Pressure ◽  
Surface Composition ◽  
Phospholipid Monolayers

Kick Management Study on Automated Well Control for Managed Pressure Drilling in Long Wells

2018 ◽  
Author(s):  
Amare Leulseged ◽  
Sima A. Nepal ◽  
Dan Sui ◽  
Suranga C. H. Geekiyanage
Keyword(s):  
Surface Pressure ◽  
Flow Model ◽  
Transient Flow ◽  
Pressure Profile ◽  
Pressure Control ◽  
Control Procedure ◽  
Well Control ◽  
Managed Pressure Drilling ◽  
Drilling Technology ◽  
Advanced Drilling

In drilling operations, the downhole pressure (BHP) requires to be closely monitored and precisely managed to avoid potential drilling events harmful to personnel and environment. If the BHP is lower than the pore pressure, kick (amount of influx) from formation will enter the wellbore, which might result in (underground) blowout. If not properly managed, this could be more costly than surface blowouts [1]. Well control aims to stop and remove the influx and re-establish primary barriers. Managed Pressure Drilling (MPD) is an advanced drilling technology capable of precisely controlling annular pressure profile throughout the wellbore. In this study, a high fidelity transient flow model is used for simulating dynamic well control procedure in MPD to properly manage annular pressure during kick circulation after the kick is detected. In this work, an automated well control in MPD is simulated, where PID control algorithm is implemented by manipulating choke valve opening to dynamically regulate the BHP during kick circulation. The main aim is to investigate dynamic kick management with the use of different type of muds, water based mud (WBM) and oil based mud (OBM). For different mud systems, the well control performances for long extended reach wells are evaluated and compared. From simulations, it shows that the OBM is able to hide the influx to a large extent, than the WBM due to the much higher gas solubility of the OBM. In HPHT wells, the OBM is superior to the WBM with proper automatic surface pressure control in MPD operations. Using complicated dynamic flow model can provide more precisely surface pressure control for realtime dynamic kick management.

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