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Displaying 351 - 375 of 437

Thermodynamics of Enzyme Catalyzed Reactions: Part 7 - 2007 Update

October 25, 2007
Author(s)
Robert N. Goldberg, Yadu D. Tewari, Talapady N. Bhat
This review serves to update previously published evaluations of equilibrium constants and enthalpy changes for enzyme catalyzed reactions. For each reaction the following information is given: the reference for the data; the reaction studied; the name of

Avoid Common Pitfalls when using Henry's Law

September 3, 2007
Author(s)
Allan H. Harvey, Francis L. Smith
This article provides practical guidance for the use of Henry's law in design calculations, with emphasis on solutes in aqueous systems at conditions characteristic of wastewater cleanup operations. Particular attention is given to the temperature

Reference Viscosities of H 2 , CH 4 , Ar and Xe at Low Densities

August 1, 2007
Author(s)
E May, Robert F. Berg, Michael R. Moldover
We determined the zero-density viscosity eta of hydrogen, methane and argon in the temperature range 200 K to 400 K, with standard uncertainties of 0.084 % for hydrogen and argon and 0.096 % for methane. These uncertainties are dominated by the uncertainty

ILThermo: A Free-Access Web Database for Thermodynamic Properties of Ionic Liquids

July 15, 2007
Author(s)
Qian Dong, Chris D. Muzny, Andrei F. Kazakov, Vladimir Diky, Joe W. Magee, Jason A. Widegren, Robert D. Chirico, Kenneth N. Marsh, Michael D. Frenkel
The development, scope, and functionality of the web-based ionic liquids database, ILThermo, are described. The database is available free to the public, and aims to provide users worldwide with up-to-date information from publications of experimental

The Role of Water in the Thermodynamics of Drug Binding to Cyclodextrin

July 1, 2007
Author(s)
Niya Tordorova, Frederick P. Schwarz
The thermodynamic parameters, DBGo, DBHo, and DBSo, of the drugs flurbiprofen (FLP), nabumetone (NAB), and naproxen (NPX) binding to b-cyclodextrin (bCD) and to g-cyclodextrin (gCD) in 0.10 M sodium phosphate buffer were determined from isothermal

The Polarizability of Helium and Gas Metrology

June 22, 2007
Author(s)
James W. Schmidt, R Gavioso, E May, Michael R. Moldover
Using a quasi-spherical, microwave cavity resonator, we measured the refractive index of helium to deduce its molar polarizability A ε in the limit of zero density. We obtained (A ε,meas - A ε,theory)/A ε = (-1.8plus or minus} 8.4)× 10 -6, where the

Thermodynamic properties of methylquinolines: Experimental results for 2,6-dimethylquinoline and mutual validation between experiments and computational methods for methylquinolines

May 1, 2007
Author(s)
Robert D. Chirico, Russell D. Johnson III, William Steele
Measurements leading to the calculation of the standard thermodynamic properties for gaseous 2,6-dimethylquinoline (Chemical Abstracts registry number [877-43-0]) are reported. Experimental methods included adiabatic heat-capacity calorimetry, vibrating

New Global Communication Process in Thermodynamics: Impact on Quality of Published Experimental Data

October 11, 2006
Author(s)
Michael D. Frenkel, Robert D. Chirico, Vladimir Diky, Chris D. Muzny, Qian Dong, K N. Marsh, John H. Dymond, William A. Wakeham, Stephen E. Stein, Erich Koenigsberger, Anthony R. Goodwin, Joe W. Magee, Michiel Thijssen, William M. Haynes, Suphat Watanasiri, Marco Satyro, Martin Schmidt, Andrew I. Johns, Gary R. Hardin
Thermodynamic data often represent a key resource in the search for new relationships between properties of chemical systems that constitutes the basis of the scientific discovery process. In addition, thermodynamic information is critical for development

Multiparameter Equations of State for Selected Siloxanes

April 25, 2006
Author(s)
P. Colonna, R. Nannan, A. Guardone, Eric Lemmon
The development of technical equations of state using the 12-parameter Span-Wagner functional form for four siloxanes is presented in two parts. The fluids under investigation include hexamethyldisiloxane (MM), tetradecamethylhexasiloxane (MD4M)

Method and Apparatus for Precision In-Line Sampling of Distillate

February 26, 2006
Author(s)
Thomas J. Bruno
In this short note we present a method and a simple apparatus for use with simple, fractional and steam distillation operations in which the operator requires a precise measurement of instantaneous distillate composition as the distillation proceeds. There

Acoustic Thermometry: New Results From 273 K to 77 K and Progress Towards 4 K

January 1, 2006
Author(s)
Laurent Pitre, Michael R. Moldover, Weston L. Tew
We used a quasi-spherical cavity as an acoustic and microwave resonator to measure the thermodynamic temperatures T of the triple points of mercury, argon, neon, and equilibrium hydrogen, and to measure the difference T - T90, in the range 7 K to 273 K.

ThermoData Engine (TDE): Software Implementation of the Dynamic Data Evaluation Concept

May 18, 2005
Author(s)
Michael D. Frenkel, Robert D. Chirico, Vladimir Diky, Xinjian Yan, Qian Dong, Chris D. Muzny
The first full-scale software implementation of the dynamic data evaluation concept {ThermoData Engine (TDE)} is described for thermophysical and thermochemical property data. This concept requires the development of large electronic databases capable of

Properties of water and aqueous systems: Metrological applications

November 19, 2004
Author(s)
Daniel G. Friend, Allan H. Harvey
Water and aqueous systems are widely used in metrology, which is a major focus of the National Institute of Standards and Technology (NIST). Standards such as those produced by IAPWS can be used to calibrate instruments and validate protocols. In this work

Vapour Pressure of Diethyl Phthalate

September 11, 2004
Author(s)
Vladimir Rohac, Kvetoslav Ruzicka, Vlastimil Ruzicka, Dzmitry H. Zaitsau, Gennady J. Kabo, Vladimir Diky, Karel Aim
Measurements of vapour pressure in the liquid phase and of enthalpy of vaporisation and results of calculation of ideal gas properties for diethyl phthalate are reported. The method of comparative ebulliometry, the static method, and the Knudsen mass loss

Correlation for the Second Virial Coefficient of Water

March 4, 2004
Author(s)
Allan H. Harvey, Eric W. Lemmon
A new correlation has been developed to represent the second virial coefficient of water (H2O) as a function of temperature. The formulation was fitted to experimental data, both for the second virial coefficient itself and for a quantity related to its

ThermoML - An XML-Based Approach for Storage and Exchange of Experimental and Critically Evaluated Thermophysical and Thermochemical Property Data 2. Uncertainties

May 26, 2003
Author(s)
Robert D. Chirico, Michael D. Frenkel, Vladimir Diky, K N. Marsh, R C. Wilhoit
ThermoML is an XML-based approach for storage and exhange of experimental and critically evaluated thermophysical and thermochemical property data. Extensions to the ThermoML schema for the expression of uncertainties are described. Basic principles, scope
Displaying 351 - 375 of 437
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