6,067 research outputs found
Electron beam chemistry produces high purity metals
Application of radiation chemistry for deposition of metals by irradiation of aqueous solutions with high energy electrons is presented. Design of reaction vessel for irradiation of solution is illustrated. Features of radiochemical technique and procedures followed are described
Is the Sociopath Treatable? The Contribution of Psychiatry to a Legal Dilemma
This study endeavors to present for the judge, lawyer, legislator and doctor a relevant review of studies of treatment techniques to ascertain whether scientific and medical knowledge can provide treatment which will fulfill the mandate of the judicially created right to treatment. The study is particularly oriented toward reaching an interdisciplinary definition of “adequate treatment” and discusses the necessity for proper methodological procedures in relevant mental health research
New type of ellipsometry in infrared spectroscopy: The double-reference method
We have developed a conceptually new type of ellipsometry which allows the
determination of the complex refractive index by simultaneously measuring the
unpolarized normal-incidence reflectivity relative to the vacuum and to another
reference media. From these two quantities the complex optical response can be
directly obtained without Kramers-Kronig transformation. Due to its
transparency and large refractive index over a broad range of the spectrum,
from the far-infrared to the soft ultraviolet region, diamond can be ideally
used as a second reference. The experimental arrangement is rather simple
compared to other ellipsometric techniques.Comment: submitted to Appl. Phys. Let
Use of radiation in preparative chemistry
A summary and updating of previous work on the use of radiation chemistry for the preparation of pure materials are presented. Work was chiefly concerned with the reduction of metal salts in solution to the free metal using 2 MeV electrons. Metals deposited from aqueous solution are copper, silver, zinc, cadmium, thallium, tin, lead, antimony, iron, nickel, cobalt, and palladium. Dry organic solvents were evaluated for the deposition of metals based on a study involving deposition of antimony from soltions of antimony (III) chloride. The use of organic liquids for the preparation of anhydrous metal halides is also presented. Reaction mechanisms for both organic liquids and aqueous system are discussed
Submillimeter vibrationally excited water emission from the peculiar red supergiant VY CMa
Vibrationally excited emission from the SiO and H2O molecules probes the
innermost circumstellar envelopes of oxygen-rich red giant and supergiant
stars. VY CMa is the most prolific known stellar emission source in these
molecules. Observations were made to search for rotational lines in the lowest
vibrationally excited state of H2O. The APEX telescope was used for
observations of H2O lines at frequencies around 300 GHz. Two vibrationally
excited H2O lines were detected, a third one could not be found. In one of the
lines we find evidence for weak maser action, similar to known (sub)millimeter
H2O lines. We find that the other line's intensity is consistent with thermal
excitation by the circumstellar infrared radiation field. Several SiO lines
were detected together with the H2O lines.Comment: APEX A&A special issue, accepte
Simulations of atomic trajectories near a dielectric surface
We present a semiclassical model of an atom moving in the evanescent field of
a microtoroidal resonator. Atoms falling through whispering-gallery modes can
achieve strong, coherent coupling with the cavity at distances of approximately
100 nanometers from the surface; in this regime, surface-induced Casmir-Polder
level shifts become significant for atomic motion and detection. Atomic transit
events detected in recent experiments are analyzed with our simulation, which
is extended to consider atom trapping in the evanescent field of a microtoroid.Comment: 29 pages, 10 figure
Coherence in Microchip Traps
We report the coherent manipulation of internal states of neutral atoms in a
magnetic microchip trap. Coherence lifetimes exceeding 1 s are observed with
atoms at distances of m from the microchip surface. The coherence
lifetime in the chip trap is independent of atom-surface distance within our
measurement accuracy, and agrees well with the results of similar measurements
in macroscopic magnetic traps. Due to the absence of surface-induced
decoherence, a miniaturized atomic clock with a relative stability in the
range can be realized. For applications in quantum information
processing, we propose to use microwave near-fields in the proximity of chip
wires to create potentials that depend on the internal state of the atoms.Comment: Revised version, accepted for publication in Phys. Rev. Lett., 4
pages, 4 figure
Molecular cloning, expression analysis and assignment of the porcine tumor necrosis factor superfamily member 10 gene (TNFSF10) to SSC13q34 -> q36 by fluorescence in situ hybridization and radiation hybrid mapping
We have cloned the complete coding region of the porcine TNFSF10 gene. The porcine TNFSF10 cDNA has an ORF of 870 nucleotides and shares 85 % identity with human TNFSF10, and 75% and 72% identity with rat and mouse Tnfsf10 coding sequences, respectively. The deduced porcine TNFSF10 protein consists of 289 amino acids with the calculated molecular mass of 33.5 kDa and a predicted pI of 8.15. The amino acid sequence similarities correspond to 86, 72 and 70% when compared with human, rat and mouse sequences, respectively. Nor-them blot analysis detected TNFSF10-specific transcripts (similar to 1.7 kb) in various organs of a 10-week-old pig, suggesting ubiquitous expression. Real-time RT-PCR studies of various organs from fetal (days 73 and 98) and postnatal stages (two weeks, eight months) demonstrated developmental and tissue-specific regulation of TNFSF10 mRNA abundance. The chromosomal location of the porcine TNFSF10 gene was determined by FISH of a specific BAC clone to metaphase chromosomes. This TNFSF10 BAC clone has been assigned to SSC13q34 -> q36. Additionally, the localization of the TNFSF10 gene was verified by RH mapping on the porcine IMpRH panel. Copyright (c) 2005S. KargerAG, Basel
Enhanced Electron-Phonon Coupling and its Irrelevance to High T Superconductivity
It is argued that the origin of the buckling of the CuO planes in
certain cuprates as well as the strong electron-phonon coupling of the
phonon is due to the electric field across the planes induced by atoms with
different valence above and below. The magnitude of the electric field is
deduced from new Raman results on YBaCuO and
BiSr(CaY)CuO with different O and Y
doping, respectively. In the latter case it is shown that the symmetry breaking
by replacing Ca partially by Y enhances the coupling by an order of magnitude,
while the superconducting drops to about two third of its original value.Comment: 4 pages, 2 figures. This and other papers can be downloaded from
http://gwis2.circ.gwu.edu/~tp
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