Temperature and pressure dependence of the nonmetal-metal transition in sodium-ammonia solutions (electrical conductivity and pressure-volume-temperature data up to 150.deg. and 1000 bars

1975 ◽  
Vol 79 (26) ◽  
pp. 2922-2928 ◽  
Author(s):  
S. Hahne ◽  
U. Schindewolf
Keyword(s):  
Electrical Conductivity ◽  
Pressure Dependence ◽  
Temperature Data ◽  
Temperature And Pressure

Temperature and pressure dependence of electrical conductivity in synthetic anorthite

2015 ◽  
Vol 276 ◽  
pp. 136-141 ◽  
Author(s):  
Haiying Hu ◽  
Lidong Dai ◽  
Heping Li ◽  
Keshi Hui ◽  
Jia Li
Keyword(s):  
Electrical Conductivity ◽  
Pressure Dependence ◽  
Temperature And Pressure

Temperature and Pressure Dependence of the Electrical Conductivity of Two Tetraalkylammonium Tetraalkylborate Salts

1999 ◽  
Vol 52 (5) ◽  
pp. 373 ◽  
Author(s):  
Nashiour Rohman ◽  
Sekh Mahiuddin ◽  
Raymond Aich ◽  
Klaus Tödheide
Keyword(s):  
Electrical Conductivity ◽  
Glass Transition ◽  
Transition Temperature ◽  
Pressure Dependence ◽  
Empirical Equation ◽  
Electrical Conductivities ◽  
Temperature And Pressure ◽  
Isothermal Equation ◽  
Key Parameter ◽  
The Ideal

Electrical conductivities of molten trimethylpentylammonium triethyloctylborate (N1115B2228) and triethylpentylammonium triethylpentylborate (N2225B2225) were measured as functions of temperature (c. 293 · 15–383 · 15 K) and pressure (from 1 bar to 5 kbar). Analysis of the temperature dependence of the electrical conductivity was made by using the Vogel–Tammann–Fulcher equation, κ = Aexp[ – B/(T – T0)]. The empirical nature of the pressure dependence of the B and T0 parameters has revealed the possibility of obtaining an isothermal equation to explain the pressure dependence of the electrical conductivity. Accordingly, an empirical equation of the form κ = a′exp(b′ P+c′ P2) has been found to describe the pressure dependence of the electrical conductivity. The ideal glass transition temperature, T0, is the key parameter in controlling the pressure dependence of the electrical conductivity for both systems under study.

Temperature and Pressure Dependence of the Electrical Conductivity of 1-Butyl-3-methylimidazolium Bis(trifluoromethanesulfonyl)amide

2015 ◽  
Vol 60 (5) ◽  
pp. 1495-1503 ◽  
Author(s):  
Mitsuhiro Kanakubo ◽  
Kenneth R. Harris ◽  
Noriaki Tsuchihashi ◽  
Kazuyasu Ibuki ◽  
Masakatsu Ueno
Keyword(s):  
Electrical Conductivity ◽  
Pressure Dependence ◽  
Temperature And Pressure

Measurements of real non-Newtonian response for liquid lubricants under moderate pressures

2001 ◽  
Vol 215 (3) ◽  
pp. 223-233 ◽  
Author(s):  
S Bair
Keyword(s):  
Numerical Simulation ◽  
Kinetic Theory ◽  
Simple Shear ◽  
Pressure Dependence ◽  
Shear Stresses ◽  
Current Interest ◽  
Flow Properties ◽  
Power Law Fluid ◽  
Temperature And Pressure

A thorough characterization of all viscous flow properties relevant to steady simple shear was carried out for five liquid lubricants of current interest to tribology. Shear stresses were generated to values significant to concentrated contact lubrication. Two types of non-Newtonian response were observed: shear-thinning as a power-law fluid and near rate-independence. Functions and parameters were obtained for the temperature and pressure dependence of the viscosity and of the time constant for the Carreau-Yasuda equation. Results are consistent with free volume and kinetic theory, but directly contradict many assumptions currently utilized for numerical simulation and for extracting rheological properties from contact measurements.

Measured temperature and pressure dependence of Vp and Vs in compacted, polycrystalline sI methane and sII methane–ethane hydrate

2003 ◽  
Vol 81 (1-2) ◽  
pp. 47-53 ◽  
Author(s):  
M B Helgerud ◽  
W F Waite ◽  
S H Kirby ◽  
A Nur
Keyword(s):  
High Pressure ◽  
Shear Wave ◽  
Pressure Dependence ◽  
Gas Hydrate ◽  
Pressure Vessel ◽  
Wave Speed ◽  
Measured Temperature ◽  
Shear Wave Speed ◽  
Temperature And Pressure ◽  
Fixed End

We report on compressional- and shear-wave-speed measurements made on compacted polycrystalline sI methane and sII methane–ethane hydrate. The gas hydrate samples are synthesized directly in the measurement apparatus by warming granulated ice to 17°C in the presence of a clathrate-forming gas at high pressure (methane for sI, 90.2% methane, 9.8% ethane for sII). Porosity is eliminated after hydrate synthesis by compacting the sample in the synthesis pressure vessel between a hydraulic ram and a fixed end-plug, both containing shear-wave transducers. Wave-speed measurements are made between –20 and 15°C and 0 to 105 MPa applied piston pressure. PACS No.: 61.60Lj

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