TY - JOUR TI - Influence of Surface Melting Characteristics on the Wetting Behavior of Solid Adsorbed Films AU - Chiarello, R. AU - Krim, J. T2 - Langmuir AB - ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTInfluence of surface melting characteristics on the wetting behavior of solid adsorbed filmsR. Chiarello and J. KrimCite this: Langmuir 1989, 5, 3, 567–570Publication Date (Print):May 1, 1989Publication History Published online1 May 2002Published inissue 1 May 1989https://doi.org/10.1021/la00087a005RIGHTS & PERMISSIONSArticle Views42Altmetric-Citations3LEARN ABOUT THESE METRICSArticle Views are the COUNTER-compliant sum of full text article downloads since November 2008 (both PDF and HTML) across all institutions and individuals. These metrics are regularly updated to reflect usage leading up to the last few days.Citations are the number of other articles citing this article, calculated by Crossref and updated daily. Find more information about Crossref citation counts.The Altmetric Attention Score is a quantitative measure of the attention that a research article has received online. Clicking on the donut icon will load a page at altmetric.com with additional details about the score and the social media presence for the given article. Find more information on the Altmetric Attention Score and how the score is calculated. Share Add toView InAdd Full Text with ReferenceAdd Description ExportRISCitationCitation and abstractCitation and referencesMore Options Share onFacebookTwitterWechatLinked InReddit PDF (524 KB) Get e-Alerts Get e-Alerts DA - 1989/// PY - 1989/// DO - 10.1021/la00087a005 VL - 5 IS - 3 SP - 567-570 UR - http://www.scopus.com/inward/record.url?eid=2-s2.0-33845183829&partnerID=MN8TOARS ER - TY - JOUR TI - Roughness and porosity characterization of carbon and magnetic films through adsorption isotherm measurements AU - Wang, C.L. AU - Krim, J. T2 - Journal of Vacuum Science and Technology A: Vacuum, Surfaces and Films AB - Hard carbon films are receiving much current attention on account of their potential use as protective overcoats. The tribological properties have an important influence on the functional performance of the films and can be probed through studies of film porosity and roughness. The technique of adsorption is particularly advantageous for this type of investigation because the area coated by an adsorbed monolayer is precisely that involved when the protective coating is exposed to the atmosphere. Adsorption studies have been carried out for both carbon and magnetic thin films which have been deposited onto the surface electrodes of quartz-crystal microbalances. These studies provide (i) an immediate determination of whether the film is rough or porous, and (ii) if porous, an indication of pore morphology. DA - 1989/// PY - 1989/// DO - 10.1116/1.575881 VL - 7 IS - 3 SP - 2481-2485 UR - http://www.scopus.com/inward/record.url?eid=2-s2.0-0000232147&partnerID=MN8TOARS ER - TY - JOUR TI - Multilayer adsorption on a fractally rough surface AU - Pfeifer, P. AU - Wu, Y.J. AU - Cole, M.W. AU - Krim, J. T2 - Physical Review Letters AB - Models are proposed for thick-film-coverage adsorption on a general fractal surface. The basic idea is that long-range dispersion forces dominate the thermodynamic behavior. The analysis predicts the coverage to be proportional to [ln(${P}_{0}$/P${)]}^{(D\mathrm{\ensuremath{-}}3)/3}$ where P/${P}_{0}$ is the relative vapor pressure and D is the fractal dimension of the surface. Experimental examples for this behavior are presented. They are rough Ag surfaces, giving D=2.30. .AE DA - 1989/// PY - 1989/// DO - 10.1103/PhysRevLett.62.1997 VL - 62 IS - 17 SP - 1997-2000 UR - http://www.scopus.com/inward/record.url?eid=2-s2.0-0000984718&partnerID=MN8TOARS ER - TY - JOUR TI - Measurement of protein hydration shells using a quartz microbalance AU - Reinisch, L. AU - Kaiser, R.D. AU - Krim, J. T2 - Physical Review Letters AB - The protein myoglobin is dried on the surface electrodes of a 5-MHz quartz crystal oscillator. As the humidity above the film increases, the protein absorbs water and develops a hydration shell. The oscillator frequency shift measures the mass of absorbed water. Incremental decreases in the amplitude of vibration are also observed, corresponding to a softening of the protein structure and subsequent energy dissipation (damping) of the oscillations. The transition of a protein from a dry, more rigid structure to a semifluid hydrated state is observed to occur in discrete steps. DA - 1989/// PY - 1989/// DO - 10.1103/PhysRevLett.63.1743 VL - 63 IS - 16 SP - 1743-1746 UR - http://www.scopus.com/inward/record.url?eid=2-s2.0-25744458130&partnerID=MN8TOARS ER - TY - CHAP TI - Fundamental Symmetry Studies at Los Alamos using Epithermal Neutrons AU - Bowman, C.D. AU - Bowman, J.D. AU - Yuan, V.W. AU - Herczeg, P. AU - Szymanski, J. AU - Mortension, R.N. AU - Amaya, J.M. AU - Postma, H. AU - Delheij, P.P.J. AU - Baker, O.K. AU - Gould, C.R. AU - Haase, D.G. AU - Mitchell, G.E. AU - Roberson, N.R. AU - Zhu, X. AU - McDonald, A.B. AU - Coulter, K.P. AU - Benton, D. AU - Tippens, B. AU - Chupp, T.E. T2 - Fundamental Symmetries and Nuclear Structure A2 - Ginocchio, J.N. A2 - Rosen, S.P. PY - 1989/// SP - 1 PB - World Scientific ER - TY - CONF TI - Search for Parity and Time Reversal Symmetry Violation Using Polarized Neutron-Nuclear Scattering AU - Bowman, C.G. AU - Bowman, J.D. AU - Knudson, J. AU - Penttila, S. AU - Gould, C.R. AU - Haase, D.G. AU - Mitchell, G.E. AU - Roberson, N.R. AU - Delheij, P.P.J. AU - Postma, H. AU - Tippens, B. T2 - Symposium on Spin and Symmetries A2 - Ramsey, W.D. A2 - Van Oers, W.T. C2 - 1989/// C3 - Proceedings of the Symposium on Spin and Symmetries CY - Vancouver DA - 1989/// PY - 1989/// SP - 113 ER - TY - JOUR TI - EXPERIMENTS ON ELECTRON IMPACT EXCITATION AND DIELECTRONIC RECOMBINATION AT HARVARD-SMITHSONIAN AU - Gardner, L. D. AU - Kohl, J. L. AU - Savin, D. W. AU - Young, A. R. T2 - Le Journal de Physique Colloques DA - 1989/1// PY - 1989/1// DO - 10.1051/jphyscol:1989148 VL - 50 IS - C1 SP - C1-405-C1-409 J2 - J. Phys. Colloques OP - SN - 0449-1947 UR - http://dx.doi.org/10.1051/jphyscol:1989148 DB - Crossref ER - TY - JOUR TI - Higher moments of the fluctuatingS-matrix within the stochastic model for compound-nucleus scattering AU - Davis, E. D. AU - Boos�, D. T2 - Zeitschrift f�r Physik A Atomic Nuclei AB - We present expressions for the energy-averages of the most general products of fluctuatingS-matrix elements required to calculate the variance in the energy-averaged cross-section and related observables for compound-nucleus processes. The results, which areexact and hold from the regime of isolated resonances through to that of strongly-overlapping resonances (independently of the number of open channels), involve no more than straightforward three-dimensional integrals. In line with earlier general arguments, they are functions only of averageS-matrix elements. Explicit (asymptotic) expansions which approximate these results in the domain of strongly-overlapping resonances are also determined and the leading order corrections to Ericson's treatment of fluctuations deduced. Contrary to previous studies, we find that the fluctuatingS-matrix is not necessarily Gaussian distributed in this regime. In addition, we demonstrate how unitarity can be used to check our results both numerically and analytically. Other technical issues addressed include the casting of the generating function used into an “optimal” form, the treatment of complications due to its non-trivial dependence on the source matrix, and identities for the extraction of the maximal order term. These lay a foundation for other applications of the stochastic model for compound-nucleus processes. DA - 1989/12// PY - 1989/12// DO - 10.1007/bf01292429 VL - 332 IS - 4 SP - 427-441 J2 - Z. Physik A - Atomic Nuclei LA - en OP - SN - 0930-1151 1434-601X UR - http://dx.doi.org/10.1007/bf01292429 DB - Crossref ER - TY - JOUR TI - Systematic nuclear sensitivity to time reversal noninvariance AU - Davis, E.D. T2 - Physics Letters B AB - I argue in favour of using, for resolved resonances (PR), energy averages of observables in compound-nucleus (CN) reactions to set bounds on the strength of a parity- (P-) even time-reversal- (T-) odd nucleon-nucleon interaction. I show that an observable of this type exists, which, if measured to the accuracy of previous detailed-balance studies, could be used to lower the bound by an order of magnitude. DA - 1989/8// PY - 1989/8// DO - 10.1016/0370-2693(89)91179-9 VL - 226 IS - 3-4 SP - 197-201 J2 - Physics Letters B LA - en OP - SN - 0370-2693 UR - http://dx.doi.org/10.1016/0370-2693(89)91179-9 DB - Crossref ER - TY - JOUR TI - epic Grass - symbolic calculations with anticommuting variables AU - Hartmann, U. AU - Davis, E.D. T2 - Computer Physics Communications AB - epicGrass is a specialised symbolic manipulation utility for handling complicated (matrix) expressions involving commuting and anticommuting (Grassmann) variables. Its chief strength is its speed, achieved by “hardwiring” the Grassmann algebra using a table. User-friendly features include: a number of built-in functions to simplify the manipulation of matrices and expressions, an on-line help facility, sophisticated error messages and several output formats. The program has been extensively tested and a complete record of these tests is available. Extension to other related algebraic structures arising in theoretical physics is straightforward. DA - 1989/6// PY - 1989/6// DO - 10.1016/0010-4655(89)90096-9 VL - 54 IS - 2-3 SP - 353-369 J2 - Computer Physics Communications LA - en OP - SN - 0010-4655 UR - http://dx.doi.org/10.1016/0010-4655(89)90096-9 DB - Crossref ER - TY - CONF TI - Pressure and Strain Effects on Diffusion AU - Antonelli, A. AU - Bernholc, Jerzy T2 - Materials Research Society Symposium A2 - Wolford, D.J. A2 - Bernholc, J. A2 - Haller, E.E. AB - Abstract : This volume of proceedings contains manuscripts from Symposium G, entitled Impurities, Defects, and Diffusion in Semiconductors: Bulk and Layered Structures. Historically, Symposium G was the seventh in a series of MRS- sponsored symposia which focused on various aspects of defects and defect properties in semiconducting materials. This symposium was conceived from the view that impurities, defects, and diffusion play key roles in modern-day research and development of semiconducting materials, structures, and devices. Recent breakthroughs in materials preparation with monolayer control, in diversity and sensitivity of characterization techniques, and in new theoretical methods, have collectively led to great advances in the understanding of defect- and impurity-related phenomena. C2 - 1989/11/21/ C3 - Impurities, Defects and Diffusion in Semiconductors: Bulk and Layered Structures DA - 1989/11/21/ PY - 1990/// DO - 10.21236/ada229590 VL - 163 SP - 523 PB - Materials Research Society ER - TY - JOUR TI - Native Defects, Diffusion, Self-Compensation, and Boron Doping in Cubic Silicon Carbide AU - Wang, C. AU - Bemholc, J. AU - Davis, R. F. T2 - MRS Proceedings DA - 1989/// PY - 1989/// DO - 10.1557/proc-162-475 VL - 162 J2 - MRS Proc. LA - en OP - SN - 0272-9172 1946-4274 UR - http://dx.doi.org/10.1557/proc-162-475 DB - Crossref ER - TY - CONF TI - N-Type Doping and Diffusion of Impurities in Diamond AU - Kajihara, S. A. AU - Antonelli, A. AU - Bernholc, J. C2 - 1989/// C3 - MRS Proceedings DA - 1989/// DO - 10.1557/proc-162-315 VL - 162 PB - Cambridge University Press (CUP) UR - http://dx.doi.org/10.1557/proc-162-315 ER - TY - JOUR TI - Herbig-Haro objects as the heads of radiative jets AU - Blondin, John M. AU - Konigl, Arieh AU - Fryxell, Bruce A. T2 - The Astrophysical Journal AB - view Abstract Citations (97) References (22) Co-Reads Similar Papers Volume Content Graphics Metrics Export Citation NASA/ADS Herbig-Haro Objects as the Heads of Radiative Jets Blondin, John M. ; Konigl, Arieh ; Fryxell, Bruce A. Abstract The interpretation of certain HH objects as the heads of nonadiabatic supersonic jets is examined using two-dimensional numerical simulations. It is found that radiative jets develop a dense shell between the jet shock and the leading bow shock when the cooling distance behind either one of these shocks is smaller than the jet radius. It is proposed that the radiatively cooling shell may account for the variable emission pattern from objects like HH 1. Also, it is suggested that HH objects with measured space velocities that exceed the spectroscopically inferred shock velocities could correspond to heavy jets in which the bow shock is effectively adiabatic. Low-excitation objects in which these velocities are comparable may represent light jets where the jet shock is nonradiative. Publication: The Astrophysical Journal Pub Date: February 1989 DOI: 10.1086/185373 Bibcode: 1989ApJ...337L..37B Keywords: Herbig-Haro Objects; Plasma Jets; Pre-Main Sequence Stars; Star Formation; Supersonic Jet Flow; Bow Waves; Emission Spectra; Gas Dynamics; Shock Waves; Astrophysics; HYDRODYNAMICS; NEBULAE: GENERAL; SHOCK WAVES; STARS: PRE--MAIN-SEQUENCE full text sources ADS | data products SIMBAD (7) DA - 1989/2// PY - 1989/2// DO - 10.1086/185373 VL - 337 SP - L37 ER - TY - JOUR TI - The growth of density perturbations in radiative shocks AU - Blondin, John M. AU - Cioffi, Denis F. T2 - The Astrophysical Journal AB - view Abstract Citations (22) References (32) Co-Reads Similar Papers Volume Content Graphics Metrics Export Citation NASA/ADS The Growth of Density Perturbations in Radiative Shocks Blondin, John M. ; Cioffi, Denis F. Abstract The paper presents a new investigation of the growth of thermal instabilities behind radiative shocks. The analytic and numerical results disagree with McCray, Stein, and Kafatos, who were attempting to explain the filamentary structure commonly seen in supernova remnants, and proposed that the growth of density perturbations would lead to gross condensations in the postshock cooling region. Hydrodynamical simulations are generated which corroborate arguments in favor of no growth in the long-wavelength limit. These simulations also agree with a renewed analytic approach in the short-wavelength limit, and show that the region of rapid growth will remain inconspicuous in the overall density rise toward the back of the shock. It is noted that these calculations are in accord with some recent observations of supernova remnants where the observed filaments do not seem to have been produced by any local thermal instability process. Publication: The Astrophysical Journal Pub Date: October 1989 DOI: 10.1086/167955 Bibcode: 1989ApJ...345..853B Keywords: Nebulae; Shock Waves; Supernova Remnants; Thermal Instability; Density Distribution; Hydrodynamics; Simulation; Astrophysics; HYDRODYNAMICS; NEBULAE: SUPERNOVA REMNANTS; SHOCK WAVES full text sources ADS | data products SIMBAD (2) DA - 1989/10// PY - 1989/10// DO - 10.1086/167955 VL - 345 SP - 853 ER - TY - JOUR TI - Pressure effects on self-diffusion in silicon AU - Antonelli, A. AU - Bernholc, J. T2 - Physical Review B AB - The effects of hydrostatic pressure on the energetics of self-diffusion in silicon are investigated via parameter-free total-energy calculations. The three microscopic mechanisms, vacancy, interstitial, and concerted exchange, which have very similar activation energies in Si, exhibit different pressure dependences. The results suggest that a set of experiments carried out at different pressures can unravel their relative contributions by a comparison to the present results. In addition, it is shown that in contrast to the (111) surface, the nearest neighbors of the Si vacancy relax inwards, rather than outwards. DA - 1989/11/15/ PY - 1989/11/15/ DO - 10.1103/physrevb.40.10643 VL - 40 IS - 15 SP - 10643-10646 J2 - Phys. Rev. B LA - en OP - SN - 0163-1829 UR - http://dx.doi.org/10.1103/physrevb.40.10643 DB - Crossref ER - TY - CHAP TI - Defect Abundances and Diffusion Mechanisms in Diamond, SiC, Si and Ge AU - Bernholc, J. AU - Antonelli, A. AU - Wang, C. AU - Davis, R. F. AU - Pantelides, S. T. T2 - Atomistic Simulation of Materials PY - 1989/// DO - 10.1007/978-1-4684-5703-2_4 SP - 33-39 OP - PB - Springer US SN - 9781468457056 9781468457032 UR - http://dx.doi.org/10.1007/978-1-4684-5703-2_4 DB - Crossref ER - TY - JOUR TI - Structural and electronic properties of arsenic chalcogenide molecules AU - Babić, Davorin AU - Rabii, Sohrab AU - Bernholc, Jerzy T2 - Physical Review B AB - Local-density cluster pseudopotential calculations have been carried out for arsenic chalcogenide molecules ${\mathrm{As}}_{4}$${\mathrm{S}}_{4}$, ${\mathrm{As}}_{4}$${\mathrm{S}}_{5}$, ${\mathrm{As}}_{4}$${\mathrm{S}}_{6}$, and ${\mathrm{As}}_{4}$${\mathrm{Se}}_{4}$. Based on the results of the calculations, a model has been developed that explains the relative stability of the arsenic sulfide molecules. Arsenic-arsenic bonds in ${\mathrm{As}}_{4}$${\mathrm{S}}_{4}$ and ${\mathrm{As}}_{4}$${\mathrm{S}}_{5}$ are suggested as the main reasons for the stability of these molecules. The ${\mathrm{As}}_{4}$${\mathrm{S}}_{4}$ and ${\mathrm{As}}_{4}$${\mathrm{Se}}_{4}$ molecules represent well the electronic properties of the corresponding solids. A randomly packed network of either ${\mathrm{As}}_{4}$${\mathrm{S}}_{5}$ and ${\mathrm{As}}_{4}$${\mathrm{S}}_{6}$ molecules appears to be an unlikely model for the local structure of the amorphous ${\mathrm{As}}_{2}$${\mathrm{S}}_{3}$. Excellent transferability of the arsenic-sulfur bond charge density among the molecules has been found. DA - 1989/5/15/ PY - 1989/5/15/ DO - 10.1103/physrevb.39.10831 VL - 39 IS - 15 SP - 10831-10838 J2 - Phys. Rev. B LA - en OP - SN - 0163-1829 UR - http://dx.doi.org/10.1103/physrevb.39.10831 DB - Crossref ER - TY - JOUR TI - The shapes of first‐stage sinters AU - Amar, Francois AU - Bernholc, J. AU - Berry, R. Stephen AU - Jellinek, Julius AU - Salamon, Peter T2 - Journal of Applied Physics AB - The shape of first-stage sinters is derived within a framework in which a solid skeleton is wetted by a mobile‘‘liquid’’ pool. Several lattices are considered as possible solid skeletons, corresponding to various degrees of surface versus grain boundary and volume transport; the effect of a nonzero dihedral angle at the interface between crystal faces is also treated. In some cases, significant differences exist between shapes calculated by minimizing the free energy and the shapes assumed by previous workers. DA - 1989/4/15/ PY - 1989/4/15/ DO - 10.1063/1.342674 VL - 65 IS - 8 SP - 3219-3225 J2 - Journal of Applied Physics LA - en OP - SN - 0021-8979 1089-7550 UR - http://dx.doi.org/10.1063/1.342674 DB - Crossref ER - TY - JOUR TI - Experimental observation of crisis-induced intermittency and its critical exponent AU - Ditto, W.L. AU - Rauseo, S. AU - Cawley, R. AU - Grebogi, C. AU - Hsu, G.-H. AU - Kostelich, E. AU - Ott, E. AU - Savage, H.T. AU - Segnan, R. AU - Spano, M.L. AU - Yorke, J.A. T2 - Physical Review Letters AB - Critical behavior associated with intermittent temporal bursting accompanying the sudden widening of a chaotic attractor was observed and investigated experimentally in a gravitationally buckled, parametrically driven, magnetoelastic ribbon. As the driving frequency, f, was decreased through the critical value, ${f}_{c}$, we observed that the mean time between bursts scaled as \ensuremath{\Vert}${f}_{c}$-f${\ensuremath{\Vert}}^{\mathrm{\ensuremath{-}}\ensuremath{\gamma}}$. .AE DA - 1989/// PY - 1989/// DO - 10.1103/PhysRevLett.63.923 VL - 63 IS - 9 SP - 923-926 UR - http://www.scopus.com/inward/record.url?eid=2-s2.0-5844249871&partnerID=MN8TOARS ER - TY - JOUR TI - Reduction of defects by high temperature (180 degrees c-240 degrees c) annealing in room temperature deposited hydrogenated amorphous silicon AU - Parsons, G.N. AU - Wang, C. AU - Lucovsky, G. T2 - Journal of Non-crystalline Solids DA - 1989/// PY - 1989/// SP - 114 ER - TY - JOUR TI - Precursors for the deposition of amorphous silicon hydrogen alloys by remote plasma enhanced CVD AU - Parsons, G.N. AU - Tsu, D.V. AU - Wang, C. AU - Lucovsky, G. T2 - Journal of Vacuum Science & Technology DA - 1989/// PY - 1989/// VL - A IS - 7 SP - 1124-1129 ER - TY - JOUR TI - Mass and optical emission spectroscopic studies of the gas phase during the deposition of SiO2 and a-Si:H by remote plasma enhanced chemical vapor deposition AU - Tsu, D.V. AU - Parsons, G.N. AU - Lucovsky, G. AU - Watkins, M.W. T2 - Journal of Vacuum Science & Technology DA - 1989/// PY - 1989/// VL - A IS - 7 SP - 1115-1123 ER - TY - JOUR TI - Dependence of the chemical, electrical and photoelectronic properties of a-Si:H/Si3N4 interfaces on the deposition sequence AU - Kim, S.S. AU - Parsons, G.N. AU - Lucovsky, G. T2 - Journal of Non-Cyrstalline Solids DA - 1989/// PY - 1989/// VL - 114 ER - TY - JOUR TI - Defects in a-Si:H films produced by remote plasma enhanced CVD AU - Parsons, G.N. AU - Tsu, T.V. AU - Lucovsky, G. T2 - Journal of Non-crystalline Solids DA - 1989/// PY - 1989/// VL - 107 SP - 295-300 ER - TY - BOOK TI - The Conference on Computers in Physics Instruction proceedings AU - editors, Edward F. Redish AU - Risley, John S. AU - editor, Nancy Margolis DA - 1989/// PY - 1989/// PB - Redwood City, Calif: Addison-Wesley ER - TY - JOUR TI - EFFECT OF HOST-RESISTANCE ON PATHOGENESIS OF MAIZE-DWARF MOSAIC-VIRUS AU - LAW, MD AU - MOYER, JW AU - PAYNE, GA T2 - PHYTOPATHOLOGY AB - Infectious virus was detected only in tissue above the inoculated leaf in PB3187 plants expressing the susceptible phenotype but not in equivalent leaves of plants expressing the resistant phenotype. This phenomenon of differential phenotype expression was not affected by plant age or temperature. We propose that the resistance mechanism expressed in PB3187 acts at a specific point of systemic virus transport, thereby limiting upward virus transport from the roots to young, developing leaves DA - 1989/7// PY - 1989/7// DO - 10.1094/Phyto-79-757 VL - 79 IS - 7 SP - 757-761 SN - 0031-949X ER - TY - JOUR TI - Applications of Macintosh microcomputers in introductory physics AU - Beichner, Robert T2 - Physics Teacher AB - First Page DA - 1989/// PY - 1989/// DO - 10.1119/1.2342789 VL - 27 IS - 5 SP - 384–353 ER - TY - CONF TI - VideoGraph: A new way to study kinematics AU - Beichner, R. AU - DeMarco, M. AU - Ettestad, D. AU - Gleason, E. A2 - Redish, Edward F. A2 - Risley, John S. C2 - 1989/// C3 - Conference on Computers in Physics Instruction : proceedings DA - 1989/// PB - Redwood City, Calif.: Addison-Wesley ER - TY - CONF TI - The VideoGraph Project AU - Beichner, R. C2 - 1989/// C3 - Proceedings: National Educational Computing Conference 1989, Boston, Massachusetts, June 20-22 DA - 1989/// SP - 295 PB - Eugene, OR : International Council on Computers for Education, University of Oregon SN - 9780924667619 ER - TY - JOUR TI - SCALAR FIELD WORMHOLES AU - BROWN, JD AU - BURGESS, CP AU - KSHIRSAGAR, A AU - WHITING, BF AU - YORK, JW T2 - NUCLEAR PHYSICS B AB - A classical wormhole solution is constructed for gravity couples to a positive energg, maplese scalar field. We examine carefully the definitions of euclideanization, and find that this solution is equivalent to the wormhole previously obtained for gravity coupled to an antisymmetric, two-index gauge potential, which is locally dual to the scalar field. However, as we explain, this wormhole solution is characterized by a scalar field configuration which is co. DA - 1989/12/11/ PY - 1989/12/11/ DO - 10.1016/0550-3213(89)90101-6 VL - 328 IS - 1 SP - 213-222 SN - 0550-3213 ER - TY - JOUR TI - JACOBI ACTION AND THE RECOVERY OF TIME IN GENERAL-RELATIVITY AU - BROWN, JD AU - YORK, JW T2 - PHYSICAL REVIEW D AB - We argue that the usual action principle of general relativity, applied to spacetimes with closed spatial geometries, should be regarded as analogous to Jacobi's form of the principle of stationary action, in which the energy rather than a physical time is fixed. Following the paradigm of quantization based on Jacobi's action for a nonrelativistic particle, we show that the Wheeler-DeWitt equation corresponds to a time-independent Schr\"odinger equation. The relationship between Jacobi's and Hamilton's action principles then allows us to derive a time-dependent Wheeler-DeWitt equation of the Schr\"odinger type. In this equation, the role of energy is played by the cosmological constant and that of physical time by the four-volume of spacetime. DA - 1989/11/15/ PY - 1989/11/15/ DO - 10.1103/physrevd.40.3312 VL - 40 IS - 10 SP - 3312-3318 SN - 0556-2821 UR - http://inspirehep.net/record/287903 ER - TY - JOUR TI - EFFECTS OF THE NEAREST NEIGHBORS AND THE ALLOY MATRIX ON SIH STRETCHING VIBRATIONS IN THE AMORPHOUS SIOR-H (0-LESS-THAN-R-LESS-THAN-2) ALLOY SYSTEM AU - TSU, DV AU - LUCOVSKY, G AU - DAVIDSON, BN T2 - PHYSICAL REVIEW B AB - Hydrogenated silicon suboxides, ${\mathrm{SiO}}_{\mathrm{r}}$:H, for alloy range (0<r<2) have been deposited by remote plasma-enhanced chemical vapor deposition (remote PECVD) under conditions in which hydrogen is incorporated predominantly in monohydride or SiH bonding configurations. We have investigated both the SiH bond-stretching and bond-bending absorption bands by infrared (ir) absorption spectroscopy as a function of r, the alloy composition. In this paper, we have focused on the bond-stretching absorption bands, and have modeled the shape of the bond-stretching band as a function of the alloy composition. There are four distinct local environments for the SiH group in the sub- oxides; these can be written as HSi-${\mathrm{Si}}_{3\mathrm{\ensuremath{-}}\mathrm{n}}$${\mathrm{O}}_{\mathrm{n}}$, for n=0--3. A sum of Gaussian functions, one for each environment, is used to synthesize the absorption in the SiH stretching band. The peak positions of these Gaussians are calculated by an induction model which includes both local and matrix (or alloy) effects; the amplitude weightings are determined from a random statistical model for the local bonding environments of the Si-O groups in the ${\mathrm{SiO}}_{\mathrm{r}}$ alloy. We find that the frequency shifts caused by changes in the matrix, and associated with different values of r, are comparable to the shifts associated with the different local environments. The combination of these effects serves to diminish the discreteness of subband features in the absorption spectrum. DA - 1989/7/15/ PY - 1989/7/15/ DO - 10.1103/physrevb.40.1795 VL - 40 IS - 3 SP - 1795-1805 SN - 0163-1829 ER -