10,000 publications from this institution
Abstract ChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 200 leading journals. To access a ChemInform Abstract of an article which was published elsewhere, please select a “Full Text” option. The original article is trackable via the “References” option.
The resistance of carbon steel, E-Brite 26-1, Type 316L stainless steel, Haynes Alloy 20 Mod, Carpenter Alloy 20 Cb-3, Inconel Alloy 625, Hastelloy Alloy G, Hastelloy Alloy C-276, Titanium 50A, and TiCode 12 to pitting in a low salinity geothermal brine (Nowlin No. 1) was determined. The behavior of coupons exposed to the "fresh," unflashed wellhead brine was compared with the behavior of coupons exposed to unflashed brine collected at the wellhead and transported to the laboratory. Pitting potentials were also determined in laboratory tests. There was excellent agreement between laboratory and field test data. The two titanium alloys were completely resistant to pitting under all experimental conditions, Hastelloy Alloy C-276 was the nickel base alloy most resistant to pitting, and Haynes Alloy 20 Mod was the most resistant iron base alloy. The breakdown potentials for the high chromium ferrous alloys satisfy the thermodynamic requirements for pit initiation via oxidative dissolution of manganese sulfide inclusions in the passive film.
This dissertation describes work in the field of computational biology. We present three results on algorithms for comparing strings with applications for DNA and protein sequence analysis. We also describe the first application of machine learning to the problem of predicting the cellular localization sites of proteins from their sequences.
An entry from the Cambridge Structural Database, the world’s repository for small molecule crystal structures. The entry contains experimental data from a crystal diffraction study. The deposited dataset for this entry is freely available from the CCDC and typically includes 3D coordinates, cell parameters, space group, experimental conditions and quality measures.
The objectives of this project have been twofold: (1) to develop a theoretical model for designing bubble-column reactors and assessing their performance and (2) to characterize the performance of a laboratory-scale bubble-column reactor. The theoretical part of the project has focused the effects of gas-liquid mass transfer; axial dispersion of gas, liquid, and catalyst; ad the interplay between the kinetics of Fischer-Tropsch synthesis and the water-gas-shift reaction. The experimental portion of the project has focused the effects of reaction conditions on product distribution and, in particular, the conditions under which gas-liquid mass transfer becomes important. Any independent set of experiments was undertaken to investigate the chemistry of carbonaceous deposits formed during Fischer-Tropsch synthesis. 8 refs.
Research Article| March 01, 2009 Age constraints on alleged "footprints" preserved in the Xalnene Tuff near Puebla, Mexico Joshua M. Feinberg; Joshua M. Feinberg * 11Institute for Rock Magnetism, Department of Geology and Geophysics, University of Minnesota, 310 Pillsbury Drive SE, Minneapolis, Minnesota 55455, USA *E-mail: feinberg@umn.edu. Search for other works by this author on: GSW Google Scholar Paul R. Renne; Paul R. Renne 22Berkeley Geochronology Center, 2455 Ridge Road, Berkeley, California 94709, USA 33University of California–Berkeley, Department of Earth and Planetary Science, 340 McCone Hall, Berkeley, California 94720, USA Search for other works by this author on: GSW Google Scholar Joaquin Arroyo-Cabrales; Joaquin Arroyo-Cabrales 44Laboratorio de Arqueozoología, Subdirección de Laboratorios y Apoyo Académico, Instituto Nacional de Antropología e Historia, 06060 México, D.F. Mexico Search for other works by this author on: GSW Google Scholar Michael R. Waters; Michael R. Waters 55Center for the Study of the First Americans, Departments of Anthropology and Geography, Texas A&M University, College Station, Texas 77843–4352, USA Search for other works by this author on: GSW Google Scholar Patricia Ochoa-Castillo; Patricia Ochoa-Castillo 66Subdirección de Arqueología, Museo Nacional de Antropología, Reforma y Gandhi s/n, CP 11560, México, D.F. Mexico Search for other works by this author on: GSW Google Scholar Mario Perez-Campa Mario Perez-Campa 77Secretariá Técnica, Instituto Nacional de Antropología e Historia, 06700, México, D.F. Mexico Search for other works by this author on: GSW Google Scholar Geology (2009) 37 (3): 267–270. https://doi.org/10.1130/G24913A.1 Article history received: 06 Mar 2008 rev-recd: 27 Oct 2008 accepted: 06 Nov 2008 first online: 02 Mar 2017 Cite View This Citation Add to Citation Manager Share Icon Share Facebook Twitter LinkedIn MailTo Tools Icon Tools Get Permissions Search Site Citation Joshua M. Feinberg, Paul R. Renne, Joaquin Arroyo-Cabrales, Michael R. Waters, Patricia Ochoa-Castillo, Mario Perez-Campa; Age constraints on alleged "footprints" preserved in the Xalnene Tuff near Puebla, Mexico. Geology 2009;; 37 (3): 267–270. doi: https://doi.org/10.1130/G24913A.1 Download citation file: Ris (Zotero) Refmanager EasyBib Bookends Mendeley Papers EndNote RefWorks BibTex toolbar search Search Dropdown Menu toolbar search search input Search input auto suggest filter your search All ContentBy SocietyGeology Search Advanced Search Abstract Impressions in a basaltic tuff located around Valsequillo Reservoir near Puebla, Mexico, have been interpreted as human and animal footprints along an ancient lakeshore, and are cited as evidence of the presence of humans in North America at 40 ka B.P. In this paper, we present new data that challenge this interpretation. Paleomagnetic analyses of the Xalnene Tuff, and lavas from the volcano from which it erupted, yield fully reversed magnetic polarities, indicating that the tuff was deposited prior to the last geomagnetic reversal (the Brunhes-Matuyama ca. 790 ka). 40Ar/39Ar dating of Xalnene lapilli and lava from the source volcano yields indistinguishable ages of ~1.3 Ma, consistent with a period of reversed magnetic polarity (C1r.2r). Additional paleomagnetic measurements of individual millimeter-size lapilli indicate that the pyroclastic grains within the Xalnene Tuff have not been disturbed or rotated since their initial deposition, thereby ruling out the possibility that the tuff was reworked by wave action along the shores of an ancient lacustrine environment. This and other evidence indicate that the marks observed in the stone quarry site are not human ichnofossils. You do not have access to this content, please speak to your institutional administrator if you feel you should have access.
Code-selective frequency shifting by RF photonic mixing that may be used to demultiplex direct sequence encoded CDMA signals in the optical domain has been demonstrated. The technique exploits the bipolar nature of the optical field without requiring an optical local oscillator, and spectrally isolates the desired channel before photodetection.
