An official website of the United States government
Here’s how you know
Official websites use .gov
A .gov website belongs to an official government organization in the United States.
Secure .gov websites use HTTPS
A lock (
) or https:// means you’ve safely connected to the .gov website. Share sensitive information only on official, secure websites.
Isopiestic determinations of the osmotic coefficient of MgSO 4(aq) against NaCl(aq) and Kcl(aq) reference standards were performed with long equilibration times
The electronic effects produced by controlled gas exposures on [alpha]-sexithiophene thin films have been investigated using x-ray photoelectron spectroscopy
Bit interleaving is a technique that sometimes can collapse a problem of high-dimensional data to one of lower dimensional data. Our favorite use is going from
The crystal structure of strontium potassium arsenate octahydrate, SrKAsO 4.8H 2O, has been determined by single crystal x-ray diffraction. The crystals are
Sheldon M. Wiederhorn, William E. Luecke, Ralph Krause
In structural materials, lifetime is often strain-determined. Once a part exceeds its allowable strain, its functional integrity is lost. Although most ceramics
Calculations of atomic-level mechanical hardness are reported for fice diamond-like materials: diamond, silica, β-silicon-carbide, β-boron-nitride, and boron
C L. Jackson, H D. Chanzy, F P. Booy, B Drake, D A. Tomalia, Barry J. Bauer, Eric J. Amis
Images of individual dendrimer molecules of poly(amidoamine) (PAMAM) from generation 10 (G10) to G5 were imaged by conventional transmission electron microscopy
Over the past decade, a multiple small-angle neutron scattering (MSANS) formalism has been developed to enable researchers to derive microstructural parameters
Masked ion beam lithography using highly charged ions is demonstrated for the first time by producing an array of hundreds of ordered micrometer wide dots using
John H. Burnett, Ulf Griesmann, M Walhout, J L. Dehmer, J R. Roberts, R Gupta
The refractive indices of several fused silica and calcium fluoride samples from different suppliers were measured with the minimum deviation method in the deep
The p-p-T realtionships were measured for difluoromethane (R152a) and 1,1,1-trifluorethane (R143a) by an isochoric method with gravimetric determinations of the
The geometry and vibrational spectrum of the gas-phase acetylacetonate anion [acac-; (CH 3CO) 2CH -] are predicted using ab initio molecular orbital theory. At
The efforts to form a laboratory accreditation cooperation in the United States and North America are described, including activities by the Laboratory
Trace elemental constituents present in materials at concentration levels below 0.01 mass fraction can exert significant control on important electronic
Lipase immobilized on controlled-pore glass beads was used to catalyze the esterification of 1-dodecanol and 1-dodecanoic acid in organic solvents. Equilibrium
Finely dispersed systems such as emulsions and colloidal suspensions are recognized as playing a critical role in many important industrial processes. Many of
D Basak, William J. Boettinger, Daniel Josell, Sam R. Coriell, J L. McClure, Sitaraman Krishnan, A Cezairliyan
The effect of heating rate and grain size on the melting behavior of Nb-47 mass % Ti is measured and modeled. The experimental method uses rapid resistive self
B J. Tierney, W R. Pitner, J A. Mitchell, C L. Hussey, Gery R. Stafford
The electrodeposition of copper and copper-aluminum alloys was investigated in the Lewis acidic aluminum chloride-1-methyl-3-ethylimidazolium chloride [60.0-40
D J. Searles, D J. Evans, Howard J. Hanley, S Murad
Isothermal-isobaric nonequilibrium molecular dynamics and Green-Kubo simulations are developed and used to calculate the thermal conductivity of an 864 particle
N A. Ahmad, A A. Wheeler, William J. Boettinger, Geoffrey B. McFadden
During rapid solidification, solute may be incorporated into the solid phase at a concentration significantly different than that predicted by equilibrium
A study is made of the damage resistance of silicon nitride bilayer consisting of a hard overlayer [coating] on a soft underlayer [substrate]. The two layers
Harold V. Parks, E M. Spain, J E. Smedley, S R. Leone
A pulsed laser investigation is performed to study the detailed efforts of electronic angular momentum alignment on the cross section for the energy transfer
T Jiao, Zhiyu Pang, Theodore J. Burkey, R F. Johnston, T Heimer, V D. Kleiman, Edwin J. Heilweil
Ring closures following flash photolysis in alkane solvents has been detected for several complexes in the series η 5-C 5H 4R)Mn(CO) 3 where R = COCH 3 (1)
The epoxidations of propene and isobutene with peroxyformic acid proceed in a concerted way via Markovnikov-type slightly unsymmetrical transition structures
Fahriye N. Sari, Marcia J. Holden, M P. Mayhew, V L. Vilker, B Coxon
Putidaredoxin is a di-iron protein whose paramagnetic region is not well characterized by 1H detected NMR. We have studied the structure of this region in
Joseph C. Woicik, J O. Cross, Charles E. Bouldin, Bruce D. Ravel, J G. Pellegrino, B W. Steiner, S G. Bompadre, L B. Sorensen, K E. Miyano, J P. Kirkland
Diffraction anomalous fine-structure measurements performed at both the Ga and As K edges have determined the Ga-As bond length to be 2.442 ± 0.005 {Angstrom}