Filters: Collection: "ir_uspace"
| Creator | Title | Description | Subject | Date | ||
|---|---|---|---|---|---|---|
| 176 |
 |
Liu, Feng | Self-organized nanoscale pattern formation on vicinal Si(111) surfaces via a two-stage faceting transition | We demonstrate a self-organized pattern formation on vicinal Si(111) surfaces that are miscut toward the [211] direction. All the patterns, consisting of a periodic array of alternating (7 X 7) reconstructed terraces and step-bunched facets, have the same periodicity and facet structure, independent... | Vicinal Si(111); Nanoscale pattern formation; Two-stage; Faceting transition | 2002-02 |
| 177 |
 |
Miller, Joel Steven; Epstein, Arthur J. | Optical properties of quinolinium tetracyanoquinodimethanide, [Qn(TCNQ)2] and (N-methylphenazinium)x(phenazine)1-x (tetracyanoquinodimethane) [(NMP)x(Phen)1-x(TCNQ)] | We present here optical-absorption data of quinolinium ditetracyanoquinodimethanide [Qn(TCNQ)2] and (N-methylphenazinium)x(phenazine)1-x(tetracyanoquinodimethanide) [(NMP)x(Phen)1-x(TCNQ)] for 0.5 <_x<_ 0.6. These materials span the range of electronic structure from commensurate, to commensurate ... | Commensurate; Lattice; Electron | 1989 |
| 178 |
 |
Morse, Michael David | Spectroscopic studies of jet-cooled AINi | Resonant two-photon ionization spectroscopy has been used to interrogate diatomic AlNi produced by laser vaporization of a 1:l alloy target in a supersonic molecular beam of helium. Although a large density of states in this molecule prohibits a concise elucidation of its electronic structure, the p... | 1993 | |
| 179 |
 |
Vardeny, Zeev Valentine; Ehrenfreund, Eitan A. | Amplitude and phase modes in trans-polyacetylene: resonant Raman scattering and induced infrared activity | The resonant Raman scattering (RRS) from the three Ag modes of trans-polyacetylene and the charged-induced ir modes are analyzed with use of the amplitude- and phase-mode theories. It is shown that the observed phonon frequencies and the relative intensities of all modes obtained at various laser ex... | Induced infrared activity; Ag modes; Amplitude modes; Phase modes; Trans-polyacetylene | 1987-07 |
| 180 |
 |
Ogburn, Joyce L. | Acquiring minds want to know: cloth - paper-still, an issue | Acquiring Minds Want to Know column: "In the last issue of Against the Grain, I presented some ideas about the possible assumptions about obligations that underlie the scholarly paperback market. This article gets a little more practical and presents some figures from Yale for your consideration." | Books, paperback; Books, hardback; Acquisitions, libraries | 1994-11 |
| 181 |
 |
Stevenson, Jeff; Procter, Melinda; Hillyard, David R. | Real time PCR assays for the detection of viral pathogens - are they the gold standard? | Over the past decade, PCR testing for infectious agents in the clinical laboratory has begun to replace other methods, such as culture. PCR is often now referred to as the 'gold standard' in this field. Further evolution of this technology has seen the introduction of real time PCR, replacing tradit... | Polymorphism; Target DNA | 2003-11-11 |
| 182 |
 |
Vardeny, Zeev Valentine; Ehrenfreund, Eitan A. | Resonant Raman scattering from amplitude modes in trans-(CH)x and -(CD)x | The three resonantly enhanced Raman vibrations in trans-(CK)x and ~(CD)X are described in terms of amplitude modes associated with the Peierls gap. The dispersion in the Raman-line profiles is explained by inhomogeneity. A narrow distribution of the effective electron-phonon coupling constant is re... | Peierls gap | 1983-12 |
| 183 |
 |
Wu, Yong-Shi | Deformed Hubbard operator, bosonization, and phase diagram of the one-dimensional t-J model | We present an analytic study of the phase diagram of the one-dimensional t-J model and a couple of its cousins. To deal with the interactions induced by the no double occupancy constraints, we introduce a deformation of the Hubbard operators. When the deformation parameter ∆ is small, the induced... | Hubbard operator; Bosonization; Deformation; t-J model | 2002-10 |
| 184 |
 |
Brenckle, J. F. | A new polygonum from Garfield County, Utah | The plant described below was collected 6 miles north of Escalante, Garfield Co., Utah, by W . P. Cottam, Sept. 17, 1935. It was found growing in great abundance along sandy ravines on the rocky Navajo sandstone spur which projects southward from the Aquarius Plateau. The type specimen, No. 65 0 7 ,... | 1940-06-27 | |
| 185 |
 |
Ailion, David Charles | 14N study of the role of N-D---O bonds in the deuteron glass transition | 14N spin-lattice relaxation-time measurements in Rb0.28(ND4)0.72D2PO4 provide direct evidence for the fast exchange averaging of the "long" and "short" N-D---O hydrogen bonds between the ND4 group and the four surrounding PO4 groups. This exchange and the associated distortion of the ND4 tetrahedron... | NMR; Hydrogen bonds; Spin-lattice; Relaxation-time; Deuteron glass | 1999 |
| 186 |
 |
Jarrard, Richard D. | Geophysical properties of oceanic crust at Sites 768 and 770 | Velocity, density, resistivity, and neutron-porosity logs were recorded in virtually the entire 222-m-thick section of basaltic back-arc crust drilled at Site 768 and through the 106-m section of MORB crust at Site 770. Our analysis of these logs and comparison with measurements on discrete cores pe... | 1991 | |
| 187 |
 |
Morse, Michael David | Spectroscopy of diatomic ZrF and ZrCl: 760 ? 555 nm | The optical spectrum of diatomic ZrF has been investigated, with transitions recorded in the range from 14 700 to 18 000 cm?1. Many bands have been observed, several of which can be grouped into three band systems. Rotationally resolved investigations are hampered by perturbations that are rampant ... | 2011 | |
| 188 |
 |
Forster, Richard R. | Initial in situ measurements of perennial meltwater storage in the Greenland firn aquifer | A perennial storage of water in a firn aquifer was discovered in southeast Greenland in 2011. We present the first in situ measurements of the aquifer, including densities and temperatures. Water was present at depths between ~12 and 37m and amounted to 18.7 ± 0.9 kg in the extracted core. The wate... | 2014-01-01 | |
| 189 |
 |
Liu, Feng | Equilibrium shape of two-dimensional islands under stress | We show that the equilibrium shape anisotropy of two-dimensional islands in heteroepitaxial growth depends on island size, a consequence of the presence of strain. Even in homoepitaxy, in which the island shape has conventionally been equated with the ratio of step energies, a substrate surface str... | Two-dimensional islands; Equilibrium shape; Heteroepitaxial growth; Homoepitaxy | 2000-08 |
| 190 |
 |
Mattis, Daniel C. | Tricritical point in random-field Ising model | The numerical investigation of the random-field Ising model by Houghton, Khurana, and Seco1 has revealed a number of interesting features concerning the three-dimensional Ising model in a random external field Bt. Earlier, Aharony2 had already found that even in a mean-field approximation the b... | Random external field; Tricritical points; Gaussian distribution | 1985 |
| 191 |
 |
Vardeny, Zeev Valentine; Taylor, P. Craig | Excitation energy dependence of photoinduced absorption in intrinsic a-Si:H | We have studied subgap absorption of intrinsic a-Si:H induced by below- and above-gap photoexcitation. We find very similar photoinduced subgap absorption spectra when excited with 2.4 eV or 1.2 eV light. Both spectra exhibit a power-law dependence on laser intensity ?T ~ 1a, where a is 0.5 and 0.7... | Intrinsic a-Si:H; Subgap absorption; Photoinduced absorption; Gap photoexcitation; Photomodulation; Electronic states | 1998 |
| 192 |
 |
Furse, Cynthia M. | Iterative array level optimization of MIMO antennas | Multiple-input-multiple-output systems have gained importance in the last decade due to their ability to provide improved capacity as compared to their SISO counterparts. System optimization promises further improvement in the capacity. The optimization can be either optimization of detection algori... | 2008 | |
| 193 |
 |
Armentrout, Peter B. | Mechanism of proton exchange: guided ion beam studies of the reactions, H(H2O)n+ (n=1-4) + D2O and D(D 2O)n+ (n=1-4) + H2O | Reactions of protonated water clusters, H(H2O)n+ (n=1-4) with D2O and their "mirror" reactions, D(D2O)n+ (n=1-4) with H2O, are are studied using guided-ion beam mass spectrometry. Absolute reaction cross sections are determined as a function of collision energy from thermal energy to over 10 eV. | Collision-induced dissociation; Proton exchange; Protonated water clusters; Exothermic reactions; Deuterium oxide | 2004 |
| 194 |
 |
Malloy, Thomas E.; Jensen, Gary C. | Emergence of dynamic form through phase relations in dynamic systems | Gregory Bateson construes mental process as the flow and transforms of differences in a system. Stuart Kauffman uses NK Boolean systems to model the emergence of order in biological evolution. Because the Boolean base (0, 1) maps to Bateson's idea of difference, we simulate Bateson's epistemology wi... | Systems; Psychology; Models | 2005-10-24 |
| 195 |
 |
Armentrout, Peter B. | Activation of methane by gold cations: guided ion beam and theoretical studies | The potential energy surface for activation of methane by the third-row transition metal cation, Au+, is studied experimentally by examining the kinetic energy dependence of this reaction using guided ion beam tandem mass spectrometry. A flow tube ion source produces Au+ primarily in its 1S0 (5d10) ... | 2006 | |
| 196 |
 |
Gondolo, Paolo | Simple renormalizable flavor symmetry for neutrino oscillations | The recent measurement of a nonzero neutrino mixing angle θ13 requires a modification of the tri-bimaximal mixing pattern that predicts a zero value for it. We propose a new neutrino mixing pattern based on a spontaneously broken A4 flavor symmetry and a type-I seesaw mechanism. Our model allows fo... | 2012-01-01 | |
| 197 |
 |
DeTar, Carleton | Reggeon calculus as a low-order perturbation theory for the Pomeron | We review the foundations of the Gribov Reggeon calculus with an emphasis on the relationship between the energy-plane and J-plane descriptions of the diagrams of the calculus. The question of the "large-rapidity-gap cutoff' for the Pomeron and the problem of signature are treated in more detail t... | Singularities; Reggeon calculus; Reggeon field theory; Two-body propagator | 1975-02 |
| 198 |
 |
Harrison, Reid R. | Low-power FM transmitter for use in neural recording applications | We present a low power FM transmitter for use in neural recording telemetry. The transmitter consists of a low noise biopotential amplifier and a voltage controlled oscillator used to transmit the amplified neural signals at a frequency of 433 MHz. The circuit is powered through a transcutaneous,... | RF telemetry; Transmitter; Neural recording; Low power circuits; Multielectrode arrays; Voltage controlled oscillator (VCO) | 2004-01-01 |
| 199 |
 |
Armentrout, Peter B. | Translational energy dependence of O+(4S) + N2 → NO+ + N from thermal energies to 30 eV c.m. | Guided ion beam mass spectrometry is used to examine the kinetic energy dependence of the reaction of ground state atomic oxygen ion with molecular nitrogen. An 0 + (4S) source which produces less than 0.06% excited states is described. Cross sections for the NO+ + N product channel decrease with... | Ion-molecule reactions; Translational energy; Threshold behavior; Endothermic reactions; Nitrogen; Oxygen | 1987 |
| 200 |
 |
Morse, Michael David | Resonant two-photon ionization spectroscopy of jet-cooled tantalum carbide, TaC | The optical spectrum of diatomic TaC has been investigated for the first time, with transitions recorded in the range from 17 850 to 20 000 cm?1. Six bands were rotationally resolved and analyzed to obtain ground and excited state parameters, including band origins, upper and lower state rotational... | 2010 |