The Isothermal Compressibility of Organic Liquids by Ultracentrifugation. Correlation with Surface Tension

1971 ◽  
Vol 49 (24) ◽  
pp. 3956-3959 ◽  
Author(s):  
Alfred J. Richard ◽  
Kenneth S. Rogers
Keyword(s):  
Surface Tension ◽  
Least Squares ◽  
Isothermal Compressibility ◽  
Regression Equation ◽  
Organic Liquids ◽  
Least Squares Regression ◽  
Analytical Ultracentrifuge ◽  
Surface Tensions ◽  
Temperature Range ◽  
Good Agreement

Isothermal compressibilities of seven organic liquids have been determined by analytical ultracentrifuge techniques, in good agreement with literature values obtained by other methods.A least squares regression equation was derived that correlated the logarithmic values of isothermal compressibilities of 7 organic liquids, determined experimentally, with the liquids' surface tensions. This equation was shown to be valid for 11 other organic liquids (values obtained from literature) over a temperature range of 0° through 50°, and a surface tension range of 13 to 44 dyn per cm.

Surface tension and density of the molten PbCl2–KCl–NaCl ternary system

1985 ◽  
Vol 63 (5) ◽  
pp. 1132-1138 ◽  
Author(s):  
T. Fujisawa ◽  
T. Utigard ◽  
J. M. Toguri
Keyword(s):  
Surface Tension ◽  
Ternary System ◽  
Surface Tensions ◽  
Maximum Bubble Pressure ◽  
Maximum Bubble Pressure Method ◽  
Temperature Range ◽  
Molar Ratios ◽  
Pressure Method ◽  
Bubble Pressure ◽  
Increasing Temperature

The maximum bubble pressure method was used to determine the surface tension and density of melts within the PbCl2–KCl–NaCl system. The temperature range of this study was from 450 to 800 °C. In all cases, the surface tension was found to decrease with increasing temperature. At constant molar ratios of KCl to NaCl, a minimum in the surface tension was observed at approximately 40 mol% PbCl2. The ternary surface tension values were found to obey the simple additivity expression of the binary surface tensions of PbCl2–KCl and PbCl2–NaCl. Based on these findings, constant surface tension contours have been drawn.The density obtained in the present study agree well with the previously determined densities using a bottom-balance Archimedean technique reported by this laboratory.

SURFACE TENSION OF COMMON AQUEOUS AND ORGANIC PHASES IN FOOD EMULSIONS1

1971 ◽  
Vol 34 (12) ◽  
pp. 584-585 ◽  
Author(s):  
M. K. Supran ◽  
J. C. Acton ◽  
A. J. Howell ◽  
R. L. Saffle
Keyword(s):  
Aqueous Solution ◽  
Surface Tension ◽  
Sodium Chloride ◽  
Regression Equations ◽  
Surface Tensions ◽  
Food Grade ◽  
Temperature Range ◽  
Sodium Sulfosuccinate ◽  
Dioctyl Sodium Sulfosuccinate ◽  
Dioctyl Sodium

Surface tensions of food grade oils, sodium chloride, sucrose, and dioctyl sodium sulfosuccinate were studied in a temperature range of 20 C to 50 C. Solutes in aqueous solution were varied in concentration. Regression equations were determined for each oil and solution except dioctyl sodium sulfosuccinate which exhibited a Type III surfactant response.

Deriving the Least Squares Regression Equation

1983 ◽  
Vol 37 (3) ◽  
pp. 232-232
Author(s):  
A. S.C. Ehrenberg
Keyword(s):  
Least Squares ◽  
Regression Equation ◽  
Least Squares Regression

A New Approach to Surface Tension According to the Surface Topographical Features in Laser Cutting Technology

2013 ◽  
Vol 334-335 ◽  
pp. 65-70 ◽  
Author(s):  
Marta Harničárová ◽  
Jan Valíček ◽  
Jana Müllerová ◽  
Milena Kušnerová ◽  
Radovan Grznárik ◽  
...  
Keyword(s):  
Surface Tension ◽  
Laser Cutting ◽  
Direct Method ◽  
Surface Tensions ◽  
New Approach ◽  
Cut Quality ◽  
Different Sources ◽  
Clean Metal ◽  
Good Agreement

Laser - cut quality is mainly characterized by a degree of accuracy in shape, size and also by surface layer conditions after cutting associated with surface roughness. An experimental determination of surface tension (or tensor components) of clean metal surfaces is very difficult and there is no direct method for its measurement. Attention was paid to numerical derivation of surface tensions according to the surface topographical features in laser cutting technology. The surface tensions and temperature dependencies of several metallic materials have been determined and confirmed by data obtained from the literature. It was found to be in very good agreement between our results and data from different sources in the literature.

The Isothermal Compressibility of Organic Liquids Over an Extensive Temperature Range

1975 ◽  
Vol 13 (3) ◽  
pp. 185-189 ◽  
Author(s):  
L.S. Shraiber
Keyword(s):  
Isothermal Compressibility ◽  
Organic Liquids ◽  
Temperature Range

Deriving the Least Squares Regression Equation

1983 ◽  
Vol 37 (3) ◽  
pp. 232
Author(s):  
A. S. C. Ehrenberg
Keyword(s):  
Least Squares ◽  
Regression Equation ◽  
Least Squares Regression

Use of reflectance spectroscopy to estimate the organic carbon and CaCO3 contents of soils

2012 ◽  
Vol 61 (2) ◽  
pp. 277-290 ◽  
Author(s):  
Ádám Csorba ◽  
Vince Láng ◽  
László Fenyvesi ◽  
Erika Michéli
Keyword(s):  
Organic Carbon ◽  
Least Squares ◽  
Partial Least Squares ◽  
Partial Least Squares Regression ◽  
Mean Squared Error ◽  
Reflectance Spectroscopy ◽  
Least Squares Regression ◽  
Root Mean Squared Error ◽  
Squared Error

Napjainkban egyre nagyobb igény mutatkozik olyan technológiák és módszerek kidolgozására és alkalmazására, melyek lehetővé teszik a gyors, költséghatékony és környezetbarát talajadat-felvételezést és kiértékelést. Ezeknek az igényeknek felel meg a reflektancia spektroszkópia, mely az elektromágneses spektrum látható (VIS) és közeli infravörös (NIR) tartományában (350–2500 nm) végzett reflektancia-mérésekre épül. Figyelembe véve, hogy a talajokról felvett reflektancia spektrum információban nagyon gazdag, és a vizsgált tartományban számos talajalkotó rendelkezik karakterisztikus spektrális „ujjlenyomattal”, egyetlen görbéből lehetővé válik nagyszámú, kulcsfontosságú talajparaméter egyidejű meghatározása. Dolgozatunkban, a reflektancia spektroszkópia alapjaira helyezett, a talajok ösz-szetételének meghatározását célzó módszertani fejlesztés első lépéseit mutatjuk be. Munkánk során talajok szervesszén- és CaCO3-tartalmának megbecslését lehetővé tévő többváltozós matematikai-statisztikai módszerekre (részleges legkisebb négyzetek módszere, partial least squares regression – PLSR) épülő prediktív modellek létrehozását és tesztelését végeztük el. A létrehozott modellek tesztelése során megállapítottuk, hogy az eljárás mindkét talajparaméter esetében magas R2értéket [R2(szerves szén) = 0,815; R2(CaCO3) = 0,907] adott. A becslés pontosságát jelző közepes négyzetes eltérés (root mean squared error – RMSE) érték mindkét paraméter esetében közepesnek mondható [RMSE (szerves szén) = 0,467; RMSE (CaCO3) = 3,508], mely a reflektancia mérési előírások standardizálásával jelentősen javítható. Vizsgálataink alapján arra a következtetésre jutottunk, hogy a reflektancia spektroszkópia és a többváltozós kemometriai eljárások együttes alkalmazásával, gyors és költséghatékony adatfelvételezési és -értékelési módszerhez juthatunk.

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