scholarly journals Simultaneous Detection Properties of Organic Vapor, Pressure Difference and Magnetic Field using a Rugate-structured Free-standing Porous Silicon Film

2017 ◽  
Vol 26 (3) ◽  
pp. 186-191 ◽  
Author(s):  
Seong-Beom Han ◽  
Ki Won Lee
Keyword(s):  
Magnetic Field ◽  
Porous Silicon ◽  
Vapor Pressure ◽  
Pressure Difference ◽  
Silicon Film ◽  
Simultaneous Detection ◽  
Free Standing ◽  
Vapor Pressure Difference ◽  
Organic Vapor

Setting Realistic Design Indoor Conditions for Residential Buildings by Vapor Pressure Difference

2009 ◽  
Vol 6 (9) ◽  
pp. 102052 ◽  
Author(s):  
Patrick Roppel ◽  
Mark Lawton ◽  
William C. Brown ◽  
Phalguni Mukhopadhyaya ◽  
Mavinkal K. Kumaran ◽  
...  
Keyword(s):  
Vapor Pressure ◽  
Pressure Difference ◽  
Residential Buildings ◽  
Vapor Pressure Difference ◽  
Indoor Conditions

Photosynthesis in an open field for exotic versus native vines of the southeastern United States

1989 ◽  
Vol 67 (2) ◽  
pp. 443-446 ◽  
Author(s):  
Gregory A. Carter ◽  
Alan H. Teramura ◽  
Irwin N. Forseth
Keyword(s):  
Vapor Pressure ◽  
Pressure Difference ◽  
Native Species ◽  
Leaf Gas Exchange ◽  
Water Vapor Pressure ◽  
High Irradiance ◽  
Pueraria Lobata ◽  
Vapor Pressure Difference ◽  
High Vapor ◽  
Parthenocissus Quinquefolia

The potential importance of leaf gas exchange to the prolific growth characteristics of the exotic vines Pueraria lobata and Lonicera japonica versus the native vines Rhus radicans, Parthenocissus quinquefolia, Vitis vulpina, and Clematis virginiana was evaluated. Under high irradiance and low leaf-air water vapor pressure difference, photosynthesis was similar (23 – 27 μmol∙m−2∙s−1) among species with the exception of R. radicans (16 μmol∙m−2∙s−1). Conductance and transpiration were greater in Pueraria lobata than in the other species. When the leaf-air vapor pressure difference was high (4.0 kPa) photosynthesis in the exotic vines decreased more than in several of the native species. Photosynthesis in L. japonica and Parthenocissus quinquefolia, and to a lesser extent in Pueraria lobata, was reduced by high vapor pressure differences even though internal CO2 partial pressures remained relatively high, suggesting a nonstomatal reduction of photosynthetic capacity. Thus, the highly prolific growth typical of the exotic vines may not be attributable to greater steady-state photosynthesis.

Osmosis: Characteristics of Liquid at an Interface

2006 ◽  
Author(s):  
Larry D. Howlett
Keyword(s):  
Kinetic Energy ◽  
Kinetic Theory ◽  
Vapor Pressure ◽  
Pressure Difference ◽  
Total Kinetic Energy ◽  
Universal Model ◽  
Vapor Pressure Difference ◽  
Water Ice ◽  
Speed Distribution

Many explanations for the movement of water across a membrane have been presented. One idea proposes that osmosis is the movement of water in response to a vapor pressure difference. It is difficult to accept this model for osmosis without a good understanding of the existence of a vapor in a liquid. We propose a model for a vapor in a liquid. The model is based upon the kinetic theory of gas and Maxwell's predicted speed distribution. Since vapor pressure and total kinetic energy are both expressions of the energy of a gas, we compare the model to published values of vapor pressure for water, ice, and several other liquids. Based upon this limited comparison, it appears that this model may be a universal model for the continuous existence of a vapor in a liquid or a solid.

Photosynthesis and transpiration in large forest-grown Douglas-fir: diurnal variation

1981 ◽  
Vol 59 (3) ◽  
pp. 349-356 ◽  
Author(s):  
Jerry W. Leverenz
Keyword(s):  
Stomatal Conductance ◽  
Vapor Pressure ◽  
Diurnal Variation ◽  
Pressure Difference ◽  
Intercellular Space ◽  
Net Photosynthesis ◽  
Douglas Fir ◽  
Leaf Temperature ◽  
Photon Flux ◽  
Vapor Pressure Difference

Net photosynthesis, transpiration, and stomatal conductance of terminal shoots of Douglas-fir (Pseudotsuga menziesii (Mirb.) Franco) were measured using an open gas exchange system. Correlations between these physiological parameters and environmental variables on an overcast day, a cool partly sunny day, and a day of high temperature and leaf–air vapor pressure difference are presented. Diurnal variation in shoot water potential and intercellular space CO2 concentration had little effect on the physiological parameters. Leaf–air vapor pressure difference and (or) leaf temperature had considerable influence on days of high temperatures. Net photosynthetic rate was strongly correlated with photon flux density on completely overcast days.Stomatal conductance exerted little control on diurnal variation of net photosynthetic rates on overcast days because stomatal conductance saturated at lower photon flux densities than net photosynthesis. When net photosynthesis was light saturated parallel responses of stomatal and residual conductances to vapor pressure difference and (or) leaf temperature occurred. Intercellular space CO2 concentration remained fairly constant when net photosynthesis was light saturated.

scholarly journals Cellulose δ18O is an index of leaf-to-air vapor pressure difference (VPD) in tropical plants

2011 ◽  
Vol 108 (5) ◽  
pp. 1981-1986 ◽  
Author(s):  
Ansgar Kahmen ◽  
Dirk Sachse ◽  
Stefan K. Arndt ◽  
Kevin P. Tu ◽  
Heraldo Farrington ◽  
...  
Keyword(s):  
Vapor Pressure ◽  
Pressure Difference ◽  
Tropical Plants ◽  
Vapor Pressure Difference

scholarly journals Experimental Study on the Heat Transfer Performance of Pump-Assisted Capillary Phase-Change Loop

2021 ◽  
Vol 11 (22) ◽  
pp. 10954
Author(s):  
Xiaoping Yang ◽  
Gaoxiang Wang ◽  
Cancan Zhang ◽  
Jie Liu ◽  
Jinjia Wei
Keyword(s):  
Thin Film ◽  
Heat Transfer ◽  
Vapor Pressure ◽  
Pressure Difference ◽  
Heat Dissipation ◽  
Vapor Pressure Difference ◽  
Thin Film Evaporation ◽  
Film Evaporation ◽  
Start Up ◽  
Liquid Vapor

To overcome the two-phase flow instability of traditional boiling heat dissipation technologies, a porous wick was used for liquid-vapor isolation, achieving efficient and stable boiling heat dissipation. A pump-assisted capillary phase-change loop with methanol as the working medium was established to study the effect of liquid-vapor pressure difference and heating power on its start-up and steady-state characteristics. The results indicated that the evaporator undergoes four heat transfer modes, including flooded, partially flooded, thin-film evaporation, and overheating. The thin-film evaporation mode was the most efficient with the shortest start-up period. In addition, heat transfer modes were determined by the liquid-vapor pressure difference and power. The heat transfer coefficient significantly improved and the thermal resistance was reduced by increasing liquid-vapor pressure as long as it did not exceed 8 kPa. However, when the liquid-vapor pressure exceeded 8 kPa, its influence on the heat transfer coefficient weakened. In addition, a two-dimensional heat transfer mode distribution diagram concerning both liquid-vapor pressure difference and power was drawn after a large number of experiments. During an engineering application, the liquid-vapor pressure difference can be controlled to maintain efficient thin-film evaporation in order to achieve the optimum heat dissipation effect.

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