publicationDate stringlengths 10 10 | abstract stringlengths 0 37.3k | title stringlengths 1 5.74k | doi stringlengths 11 47 ⌀ |
|---|---|---|---|
1989-07-01 | Method of describing spin dynamics for liquid-state NMR | null | |
1989-07-01 | Permeabilities for an homologous series of amine nitroxide spin probes were measured in liposomes of varying composition by an electron paramagnetic resonance (EPR) method. Results show that the rate-limiting step in permeation is not adsorption/desorption at the aqueous/membrane interface for two probes in phosphatidy... | Amine spin probe permeability in sonicated liposomes | null |
1989-07-01 | Artificial magnetic fields (MF) influence physiological processes in bees. 1. An inhomogeneous, static magnetic field (IMF) reduces the flying activity of bees and increases their life span by more than 60%. 2. The content of the ageing pigment lipofuscin in brain and, to a lesser extent, in thorax muscles increases wi... | Magnetic field effects on activity and ageing in honeybees | null |
1989-06-01 | We combine the results from muon spin relaxation (μSR) and neutron scattering measurements performed on the same specimen (or system) of magnetic materials. The example on a spin glass Cu Mn (5%) shows that the two techniques have complementary time windows for studying dynamic spin fluctuations. In combining the resul... | Combination of muon spin relaxation and neutron scattering studies on magnetism | null |
1989-06-01 | Spin fluctuations in Cd_1−xMn_xTe ( x =0.05, 0.10, 0.20, 0.30, 0.40, 0.54, 0.60, 0.68) were studied by the muon spin rotation (μSR) technique. Correlation times of the Mn-spins are deduced from the muon depolarization rates. A strong increase of the depolarization rate near the Mn-spin freezing temperature is observed.... | Spin dynamics in Cd_1−xMn_x Te studied by muon spin rotation | null |
1989-06-01 | On the basis of current theoretical views on the critical phenomena in isotropic Heisenberg ferromagnets the power temperature behavior Λ= c (τ)λ_0τ^-w has been derived for the muon spin relaxation rate Λ as π- T _c ^−1 ( T-T _ c ) → 0^+. It is shown that the crossover from an exchange critical regime to a dipolar one ... | On the investigation of magnetic critical phenomena in ferromagnets by μSR and PAC | null |
1989-06-01 | By application of the perturbed γ-ray distribution method combined with heavy-ion reactions and recoil implantation techniques, we have found an experimental was of producing and investigating localized 3d and 4d states in metals. 3d and 4d ions in sp metal hosts, in particular in alkali metals, exhibit the phenomena o... | Observation of localized d states in metals | null |
1989-06-01 | The stochastic theory of Mössbauer line shapes is formulated in a fashion which allows the evaluation of the spectral shapes for absorbers of arbitrary thickness, texture, and an anisotropic Lamb—Mössbauer factor. The results are specialized to a two-state-relaxation model of fluctuating electric hyperfine interaction ... | Mössbauer relaxation spectra in arbitrarily ordered absorbers—Line shape analysis for an iron(II) spincrossover complex in the presence of texture | null |
1989-06-01 | The materials crystallize in the NaCl structure. UP undergoes at 122 K a first order transition into a type I single-k antiferromagnetic state, followed by a second first order transition into a type I double-k-structure at 22 K. UTe is a ferromagnet with T _ c =104 K. The two first order transitions of UP reveal thems... | A μSR-study of UP and UTe | null |
1989-06-01 | Classification of quantum Markov master equations of spin systems with respect to the symmetry groups of the environment | null | |
1989-06-01 | Correlation between intensity of hepatic microsomal oxidation and individual life span | null | |
1989-04-01 | The spin dynamics and the spin relaxation mechanisms of the superfluid^3He-B were studied by using the NMR method in a slab geometry, where the superfluid 3 He-B was confined between narrow parallel plates with a gap smaller than the healing length of the n -texture and the magnetic field was applied parallel to the pl... | Spin dynamics of superfluid^3He-B in a slab geometry | null |
1989-03-01 | High spin (HS) ⇌ low spin (LS) conversions in transition metal complexes are nonradiative transitions between spin states. In this contribution, we present a study of the temperature and pressure dependence of the HS ⇌ LS intersystem crossing dynamics. For some iron(II) spin-crossover complexes, the rate constants were... | Dynamics of spin state conversion processes in the solid state | null |
1989-03-01 | A one dimensional system of interacting fermions in a random potential is investigated within a Hartree-Fock approximation. The model in consideration combines the onsite interaction of the Hubbard model and the stochastic site energies of the Anderson model. For a system of 120 sites and several values of the model pa... | Correlations and conductivity of interacting fermions in a disordered chain | null |
1989-03-01 | The change in yarn tension has been calculated theoretically as a function of the precipitant concentration in the precipitation bath. For the investigated system (polyoxadiazole), the calculated range in change of tension on transition from mild to severe spinning conditions is 0.45×10^−4<F<0.58×10^−3 N (under conditi... | Dynamics and kinematics of the process of spinning man-made fibres by the wet method | null |
1989-03-01 | For the bound $$q\bar q$$ and qqq systems with light quarks it is suggested to use the Salpeter equations, whose kernels correspond to quark-pair forces with one-gluon-exchange and confinement parts, both having a common colour dependence. The spin structure of the first part is taken in the standard form γ_1μγ _1 ^μ ;... | Bound
$$q\bar q$$
andqqq systems with light quarks within the framework of Salpeter equations: Quark-antiquark systems | null |
1989-03-01 | We present a general discussion of CP -violating effects in the following two and three body decays of the Z boson: Z → l ^+ l ^−, Z → l ^+ l ^−γ, where l = e , μ, τ and Z →2 jets, Z → 2 jets+γ, and Z → 3 jets. Experimental observables sensitive to CP violation in these decays are discussed systematically for the case ... |
CP violation andZ boson decays | null |
1989-02-01 | The general equivalence between D -dimensional probabilistic cellular automata (PCA) and ( D +1)-dimensional equilibrium spin models satisfying a “disorder condition” is first described in a pedagogical way and then used to analyze the phase diagrams, the critical behavior, and the universality classes of some automata... | From equilibrium spin models to probabilistic cellular automata | null |
1989-02-01 | The effect of quantum fluctuations on solitons in the easy-plane ferromagnetic chain is considered within the semiclassical approximation. In accordance with the low temperature ideal gas picture we treat the solitons as a Boltzmann gas and impose quantisation on the spin wave spectrum. We present a method which allows... | Quantum fluctuations in Sine-Gordon like magnetic chains: Corrections to soliton energies | null |
1989-01-01 | All biological structures are dynamic, and the rate and extent of motion are important in considering biological function. This is true for enzymes, for polynucleotides, and most certainly for membranes. The fluid mosaic model (Chapter 1) has helped focus attention on the mobility of membrane components by conceptualiz... | Membrane Dynamics and Protein-Lipid Interactions | null |
1989-01-01 | Inhomogeneous broadening of the ESR lines of nitroxide spin labels due to hyperfine structure is a pest that has complicated the work of spin labelers since shortly after the beginning of the spin-label era (Plachy and Kivelson, 1967; Poggi and Johnson, 1970) continually until the present (for example, Jolicoeur and Fr... | Inhomogeneously Broadened Spin-Label Spectra | null |
1989-01-01 | A parastatistics representation for the quasiparticles of the large U Hubbard model for fermions in two dimensions is discussed. Our representation replaces the dynamical Gutzwiller constraint in the large U Hubbard model by a kinematical constraint obeyed by the quasiparticles. The resulting parastatistical objects in... | Parastatistics for Highly Correlated Two Dimensional Fermi Systems | null |
1989-01-01 | Spin glasses are magnetic systems whose dynamics is, in many respects, similar to that of usual glasses. This opens the attractive perspective that recent developments of spin glass physics could also be applied to the glass-transition problem. | Slow Relaxations in Spin Glasses and Related Random Systems | null |
1989-01-01 | Theoretical approaches to spin glasses can be divided into two main categories. The first approach envisages constructing the mean-field solution of (say) the Edwards-Anderson^1(EA) Hamiltonian and then systematically expanding about it to describe the properties of three-dimensional spin glasses. Producing a mean-fiel... | Scaling Theory of the Ordered Phase of Real Spin Glasses | null |
1989-01-01 | We discuss the temperature-concentration (T− x ) phase diagram of La_2− x (SrBa)_ x CuO_4. The magnetic interactions of the hole spins with the Cu spins yield frustration, explaining the fast decrease in the Néel temperature and yielding a new spin glass phase. The same interactions yield a strong attractive hole-hole ... | Magnetic Frustration and Pairing in Doped Lanthanum Cuprate | null |
1989-01-01 | It is widely accepted that knowledge of the structure of a biological macromolecule is an important key to understanding its biological function. On the other hand, it is known that these macromolecules have adaptable structures that are specifically modified during their interactions with their partners. This adaptabi... | The Dynamics of Oligonucleotides and Peptides Determined by Proton NMR | null |
1989-01-01 | As Goodyear discovered [1], when he first vulcanized rubber in 1839, a viscous liquid of macromolecules becomes solid when a sufficient number of permanent cross-links are introduced. In common with three-dimensional simple atomic solids [2], this equilibrium rigidity is a consequence of the spontaneous breakdown of tr... | Vulcanization: How Randomly Cross-Linked Macromolecules Form Equilibrium Amorphous Solids | null |
1989-01-01 | In order to understand the exotic Cu spin dynamics in the normal (metallic) state of the high-T_c and related metallic Cu oxides, the measurements of the NQR frequency spectra and the nuclear spin-lattice relaxation have been utilized. A sizable charge differentiation in the Cu-O plane sites is found even in the metall... | NMR and NQR in Highly Correlated Metallic and Superconducting Cu Oxides | null |
1989-01-01 | Neutron spin-echo spectroscopy allows the observation of long-range internal relaxation mechanisms of macromolecules simultaneously in space and time. Thereby, it facilitates a microscopic study of molecular models applied for the explanation of macroscopic viscoelastic properties of polymer materials. After an outline... | Neutron spin-echo investigations on the dynamics of polymer systems | null |
1989-01-01 | The mechanism and functional role of lipid-protein interactions in photosynthetic membranes has been examined. The efficacy of various acyl lipids in the restoration of energy and electron transfer between solubilised chlorophyll-protein complexes was studied. The best reconstituting agent was an impure phosphatidylcho... | The Role of Lipid-Protein Interactions in the Structure and Function of Photosynthetic Membranes | null |
1989-01-01 | The two-dimensional quantum antiferromagnet is of active current interest. One of the main unsettled problems is whether magnetic long-range order exists or not in the ground state of the quantum antiferromagnet on the square lattice. In the present contribution we treat the XYZ model, 1 $$H = \mathop \Sigma \limits_{\... | Ground-State Long-Range Order of the Two-Dimensional Quantum Antiferromagnet | null |
1989-01-01 | When the random spin system is quenched in the computer simulation experiment from the infinite to a temperature below the critical temperature T _ C , it should be inevitably trapped at one of the metastable states, depending on the random sequence in the Monte Carlo simulation. Then the random spin system shows simil... | Critical Properties of the Fuzzy Model | null |
1989-01-01 | A neural network is a graph with vertices designated as synapses. Denote the set of neurons by G and its elements by 1, 2,. . ., N . For each i ∈ G . we introduce a spin s_ i with values in {−1, 1}; the neuron is “on” if s_ i = 1 and “off” if s_ i = −1. We also define couplings J _ ij between spins s_ i and s_ j and ca... | Graph spectra, connectivity, and spin glass models of associative memory | null |
1989-01-01 | Frustration is believed to be essential for the occurrence of the spin-glass phase[1]. Nevertheless, quantitative relations between spin-glass transitions and frustration have not yet been established. For the regularly frustrated Ising lattices the phase transition has been exactly solved in some two-dimensional model... | Monte Carlo Simulations on a Controlled-Frustration Model of ±J Ising Systems | null |
1989-01-01 | The title compounds are the family of the AMO_2-type (R $$\bar{3}$$ m) crystal which has a pronounced layer structure and are promising candidates for the two-dimensional Heisenberg triangular lattice antiferromagnet (2DH TAL-AF). One of the characteristic features of this frustrated system with continuous spin symmetr... | Evidence for Z_2-Vortex Excitations in the Quasi-Two-Dimensional Triangular Lattice Antiferromagnets HCrO_2 and LiCrO_2
| null |
1989-01-01 | The hexagonal compound CsNiCl_3 is one material typical of triangular lattice antiferromagnets of Heisenberg-type with small single-ion anisotropy (D/k_B=-0.033 ~ -0.13K). The Ni^2+ ions along the c-axis have the antiferromagnetic intrachain interaction (J/k_B=16.6K) and the chains form the triangular lattice in the c-... | Successive Magnetic Ordering in a Triangular Lattice Antiferromagnet CsNiCl_3
| null |
1989-01-01 | Two-dimensional NMR studies of structure and dynamics of solid polymers | null | |
1989-01-01 | The conformational energy surface of a protein is complex — the ground state of a protein is highly degenerate and consists of a large number of energy minima separated by energy barriers (1,2,3). The energy minima correspond to conformational substates (CS) of a protein. The CS have the same overall structure, but dif... | Glassy Dynamics in Proteins | null |
1989-01-01 | The “Iodine-Laser Temperature-Jump” (ILTJ) technique with a time resolution from 10^-9 s to 10^0 s has been used to study the interaction of bacteriorhodopsin (BR), reconstituted in dimyristoylphosphatidylcholine (DMPC) vesicles, with the annular lipids. The phase transition behaviour of the bilayer lipids is strongly ... | Dynamic Changes of Lipids and Bacteriorhodopsin in DMPC Bilayer Vesicles | null |
1989-01-01 | Neutron scattering probed novel two dimensional antiferromagnetic spin correlations in pure La_2CuO_4 which is the mother compound of high temperature superconductors of doped La_2-xM_xCuO_4. Cu^2+ moments are ordered instantaneously over very large areas in the CuO_2 plane but there is no measurable time averaged stag... | Two Dimensional Quantum Spin Fluid — Progenitor of High Temperature Superconductivity — | null |
1989-01-01 | This publication deals with the current controversy concerning flux creep or glass behavior in high- T _ c superconducting single crystals. It is shown that the flux creep picture is merely a phenomenological approach to the glass behavior for relatively short times and low temperatures. Glassy effects are predicted fo... | Spin Glasses and High-T_c Superconductivity | null |
1989-01-01 | We have found for an AOT/H_2O/decane Microemulsion System, microscopic water droplets formed a stable dispersed phase in the decane continuum. This was established both by a conventional and a double-constrast-variation method in small angle neutron scattering measurements. It was found that the droplet radius was give... | Structure and Dynamics of a Concentrated Microemulsion System | null |
1989-01-01 | The main purpose of the present paper is to review the basic ideas of the super-effective-field theory of critical phenomena [1–3] and the coherent-anomaly method[4–19], and to explain how to apply these new methods to dynamical complexity. | Super-Effective-Field CAM Theory of Dynamical Complexity | null |
1989-01-01 | An aeroelastic package consisting of 1) an aerodynamic solver, 2) a structural response model, and 3) a grid generation/update program has been developed to study both static and dynamic response of flexible aerospace configurations. The aerodynamics at present is a full potential solver but can be an Euler/Navier-Stok... | Unsteady Aeroelastic Computations for Flexible Configurations at Transonic and Supersonic Speeds | null |
1989-01-01 | The three original groups participating in our study used the EMI Mark I scanner from 1975 to the middle of 1977 and the EMI CT 1010 scanner after mid-1977. The Siemens Somatom DR has been used in Augsburg and Berlin since 1983, and the Philips Tomoscan CT 350 in Mainz since mid-1986. | Technique of CT and MR Examinations | null |
1989-01-01 | Primary photochemical processes in photosystem II (PSII) — energy transfer and charge separation — can be best studied free from possible interference from photosystem I (PSI), by separating the photosystems using biochemical techniques or by the use of mutants of plants which specifically lack PSI. The use of surfacta... | Some Zero- and High-Field Electron Spin Resonance and Time-Resolved Fluorescence Studies on Isolated Photosystem II Particles | null |
1989-01-01 | The character of the surrounding solvent modulates biological processes. Carboxylate ion attack on substituted phenyl esters (Bruice and Turner, 1970), a reaction studied as an enzyme model, changes in rate by four to six powers of ten for change in solvent from water to a dioxane-water mixture. The enthalpy of formati... | Enzyme Hydration and Function | null |
1989-01-01 | Due to the very strong interaction between nucleons at short distances, the nuclear shape giving the lowest energy for most light nuclei is spherical as it is the one that packs the nucleons as close together as possible. The stability of this spherical shape may be enhanced by quantum mechanics and the Pauli principle... | Superdeformation | null |
1989-01-01 | Many optimization problems in physics and biology lead to highly rugged cost functions. The most important examples come from the theory of spin glasses and from biological evolution. During the last decade new algorithms were developed in order to deal with such complex systems. Two techniques — known as simulated ann... | Optimization and Complexity in Molecular Biology and Physics | null |
1989-01-01 | The diabatic surface model of Evans is discussed as a physically grounded model for chemical reactivity. The essential component of Evans’ model (which was originally strictly empirical) is shown to be the Heisenberg hamiltonian and its projection onto reactant and product spin couplings. An implementation of this mode... | Adiabatic and Diabatic Surfaces in the Treatment of Chemical Reactivity I Theory | null |
1989-01-01 | We present an isotropic neural network model for processing by layer IVc of the primate primary visual cortex. It describes how this layer can reconstruct fine local details in an image which have been lost in the low-capacity retinal-LGN pathway, while at the same time narrowing the effective spatial-frequency bandwid... | A Cortical Network Model for Early Vision Processing | null |
1989-01-01 | The concept of “chaos” seems naturally associated with catastrophe. The most violent terrestrial catastrophes in our time—the tornadoes, earthquakes, explosions, avalanches—take the well-ordered attributes of our modern world and convert them to a chaotic jumble, with shattered buildings, ruptured utility lines, and th... | Chaos | null |
1989-01-01 | We present exact calculations of the amplitude and the probability self-propagator of a quasiparticle moving among the sites of an infinite linear chain with alternating nearest-neighbour matrix elements for transfer and alternating site energies. A general solution is given and extreme limits are studied. | Quasiparticle Motion on a Chain with Alternating Site Energies and Intersite Interactions | null |
1989-01-01 | It is well known that transient coherence between atomic sublevels can be created by a resonant light pulse in a Raman-type process. However, up to now most experimental and theoretical work on these optically induced sublevel coherences or spin transients was restricted to the case of optical broadband excitation and ... | Optically Induced Coherent Spin Transients in an Atomic Ground State | null |
1989-01-01 | The copper oxide high-T_c superconductors [1–3] have proven to be a rich and challenging arena of investigation for many condensed matter experimentalists, and particularly so for nuclear resonance investigators. In spite of a long, successful history of NMR and NQR studies of metallic solids, surprising and unpreceden... | Nuclear Resonance Studies of YBa_2Cu_3O_7-δ
| null |
1989-01-01 | Lepton — Nucleon Scattering | null | |
1989-01-01 | Strong interactions with lattice vibrations can lead to profound modifications in the transport of quasiparticles such as electrons or excitons moving in solids. Recent approaches to the problem of the description of such transport have been based on discrete nonlinear quantum evolution equations. This is a brief revie... | Nonlinearity and Randomness in Quantum Transport | null |
1989-01-01 | Can a single kidney survive for a normal life span? This is the type of question frequently asked by patients and especially by parents of children who lose one kidney in early childhood. Based on our wide experience with single-kidney rats, we will try to give an answer to this question. After the removal of its count... | Renal Function in Single-Kidney Rats | null |
1989-01-01 | Field theories in space-time dimensions D=(1,1), (2,1) (one time dimension and one or two space dimensions) possess some interesting features connected with the configuration space nontrivial topology of the systems concerned. For instance, solitons of D=2+1 theories can possess fractional charge, statistics and spin [... | On the Relativistic Field Theories with Fractional Statistics and Spin in D = (2 + 1), (3 + 1) | null |
1989-01-01 | This review paper will essentially deal with a systematic characterization of cationic reversed micelles (CTAB-1-hexanol-water) and neutral reversed micelles (Triton X-100-decanol-water). The preparation of monodisperse colloidal metal boride particles together with their use in room temperature hydrogenation reactions... | Physico-Chemical Characterization of Microemulsions: Preparation of Monodisperse Colloidal Metal Boride Particles | null |
1989-01-01 | I would like to thank Prof. Maekawa for providing such an apt introduction to my talk. In my remarks today, I shall make the case that the mechanism of high-temperature superconductivity is pairing by a “gauge” force, first identified by Halperin [1] to occur in the fractional quantum hall problem, and referred to in 2... | Fractional Quantization in High-Temperature Superconductivity | null |
1989-01-01 | Chemical or physical modification of the surface properties of polymeric materials is undoubtedly a fascinating field for research as well as a practical way to improve their value. Surface and not bulk properties determine the most relevant aspects of the behaviour in many technologically important fields, such as dye... | Photografting Processes onto Polymers | null |
1989-01-01 | The considerable successes of present day theoretical and particle physics have greatly increased both the generality of the relativistic quantum physics formalism and our confidence in that theory. Contrary to what took place during the twenties they have produced nothing that can be called a conceptual revolution. A ... | Nonseparability and the Tentative Descriptions of Reality | null |
1989-01-01 | We calculate the electronic states in the electron- and hole-doped Cu-oxide superconductors in the cluster model approach, and examine the validity of the strongly correlated one-band Hubbard model, i.e., the so-called t — J model for the oxides. Then, applying the many-body tight-binding method to the t — J model, we ... | Electronic Properties in the Cu-Oxide Superconductors | null |
1989-01-01 | Bell’s theorem is expounded as an analysis in Bayesian inference. Assuming the result of a spin measurement on a particle is governed by a causal variable internal (hidden, “local”) to the particle, one learns about it by making a spin measurement: thence about the internal variable of a second particle correlated with... | Bell’s Theorem. Inference and Quantum Transactions | null |
1988-12-01 | The Fe^3+ ions in the garnet Ca_3Fe_2Ge_3O_12 form two identical antiferromagnetic subsystems. The interaction between the two subsystems is vanishing within molecular field approximation for q =0. A coupling appears due to the spin fluctuations. The dynamics of the system is described by the Hamiltonian for a Heisenbe... | Dynamical interaction of antiferromagnetic subsystems: a neutron scattering study of the spinwave spectrum of the garnet Fe_2Ca_3(GeO_4)_3
| null |
1988-12-01 | Teichmüller theory for super Riemann surfaces is rigorously developed using the supermanifold theory of Rogers. In the case of trivial topology in the soul directions, relevant for superstring applications, the following results are proven. The super Teichmüller space is a complex super-orbifold whose body is the ordin... | Super Riemann surfaces: Uniformization and Teichmüller theory | null |
1988-10-01 | We consider Ising spin systems, equivalently lattice gases evolving under discrete- or continuous-time Markov processes, i.e., “stochastic cellular automata” or “interacting particle systems.” We show that for certain spin-flip probabilities or rates and suitable initial states the expectation values of products of spi... | On the positivity of correlations in nonequilibrium spin systems | null |
1988-09-01 | Differences in aggression produced by selective breeding for differential aggressiveness among male mice are also inherited by females: the expression of these differences in female mice depends on the conditions of assessment. In the standard opponents tests after isolation housing, consistent line differentiation was... | A developmental-genetic analysis of aggressive behavior in mice. II. Cross-sex inheritance | null |
1988-07-01 | A general version of the Kusumoto-Bullock free-volume model for reorientation dynamics of spin probe in solid polymers is described. Its application enables one to obtain simultaneously the size parameter of a segment and the kinetic-energy parameter of segmental mobility. These data, along with theoretical knowledge o... | Study of conformational-segmental mobility in linear polyethylene and isotactic polypropylene by the spin probe method | null |
1988-07-01 | We prove that the one-site distribution of Gibbs states (for any finite spin set S ) on the Bethe lattice is given by the points satisfying the equation π= T ^2π, where T=h·A·ϕ , with ϕ ( x )= x ^( q −1/ q , h ( x )=( x ∥ x ∥_ q )^ q , A =( a ( r, s )∶ r, s∈S ), and $$a(r,s) = \exp (K[r,s] + (1/q)[N,r + s])$$ We also s... | The one-site distribution of Gibbs states on Bethe lattice are probability vectors of period⩽2 for a nonlinear transformation | null |
1988-07-01 | A problem of internal source dynamics in an elastic half-space | null | |
1988-07-01 | Brown trout ( Salmo trutta ) and perch ( Perca fluviatilis ) had different vertical distributions throughout the year in the acidified lake Gjerstadvann. During summer, the brown trout lived in the 0 to 16 m depth interval, whereas the perch lived in the 0 to 8 m interval. In Gjerstadvann, the thermocline lies at 8 to ... | Vertical distribution of brown trout (Salmo Trutta) and perch (Perca Fluviatilis) in an acidified lake | null |
1988-06-01 | Laboratory culture of 40 Octopus bimaculoides from April 1982 to August 1983 through the full life cycle at 18°C vs 23°C provided information on the growth, reproductive biology and life span of this California littoral octopus. At 18°C, the cephalopods grew from a hatchling size of 0.07 g to a mean of 619 g in 404 d; ... | Effect of temperature on laboratory growth, reproduction and life span of Octopus bimaculoides
| null |
1988-05-01 | In the first part of the paper, several equations of motion by different groups of workers are critically examined. Exact equations of motion are then developed. This form is then quasi-linearised into a ballistic formulation. The geometrical motion of a spinning projectile, in the presence of a cubic restoring moment ... | A fresh look at the free flight dynamics of a spinning projectile | null |
1988-05-01 | In the present paper, the concept of embedded material derivative is proposed, the general expression for frame spin is derived, the difference between embedded material derivative and conventional one of trial unit vectors is clarified. Furthermore, the formula for strain-rate frame spin is obtained. And by means of t... | On embedded material derivative and frame spin | null |
1988-05-01 | The lifespansof parents and children appearonly weakly related,even though parents affect their children’s longevity through both genetic and environmental influences. These influences can be summarizedas a correlation betweenparents’and children’s frailty. It isshownthat even ifchildren perfectly inherit their frailty... | Inherited frailty and longevity | null |
1988-04-01 | Kinetic description of collective oscillations in a system of parametric spin waves. III. Long-wave collective modes | null | |
1988-03-01 | Starting from tight binding Hamiltonians with strong short range Coulomb interactions we show how to derive a description where the fermions with short range Coulomb repulsion are replaced by pure localised spins and the remaining fermionic degrees of freedom are modified to take into account the charge degrees of free... | Near the Kondo limit of the Anderson lattice: spins, fermions and high ‘T
_
c
’ | null |
1988-03-01 | We consider the equilibrium thermodynamics of a Dicke-type model for N identical spins of arbitrary magnitude interacting linearly and homogeneously with a boson field in a volume V _N, in the limit N →∞, V _N→∞, with N/V _N=const. The system exhibits a second-order phase transition; complete information on the spin po... | The equilibrium thermodynamics of a spin-boson model | null |
1988-02-01 | ^57Fe Mossbauer and Magnetization investigations in the series (Pd_xPt_1−x)_3Fe clarifies some of the aspects of multiple magnetic phase transitions. The data discount the intorpretation of <HF> at Fe in terms of well defined phase transitions as per the Gabay-Toulouse model. The reentrant behaviour seems to arise from... | Mössbauer evidence against the existence of intermediate ferromagnetic phase in reentrant spin glass systems (Pd_xPt_1−x)_3Fe | null |
1988-02-01 | We have used temperature dependent magnetic susceptibility, Mössbauer and EXAFS measurements to study the high spin (HS) — low spin (LS) conversion in Fe(II) (bptn) (NCS)_2, and we have combined consistently the information obtained from the different methods. | Mössbauer and exafs investigation of spin-equilibrium in a model-compound for heme proteins | null |
1988-02-01 | The spin flop phase transition is compared in K_2FeF_5 and K_2Fe_0.99Ga_0.01F_5 in terms of spin flop field, hysteresis and coexistence of phases. | Phase transitions in doped antiferromagnets | null |
1988-01-01 | Major results of muon-spin-relaxation (µSR) studies on canonical and oxide spin glasses are discussed. The metallic spin glasses Ag Mn, Au Fe, Cu Mn, and Cu Fe and the oxide spin glass Fe^2Ti0_5 are highlighted. The µSR work shows clearly that below the spin-glass temperature (T_g) both slow and rapid spin fluctuations... | Muon Spin Research on Spin Glasses | null |
1988-01-01 | NMR is a versatile technique for studying dynamic processes in the solid state. In the following account the application of NMR methods to the study of chemical, molecular and spin dynamics over the wide range of correlation times 10^-3S to 10^3s will be illustrated. | Chemical, Molecular and Spin Dynamics | null |
1988-01-01 | High resolution ^1H NMR can now be used to determine the structure of proteins in solution. Using this method, detailed structures of three helix forming peptides have been determined in organic solvents. The peptides studied, alamethicin, melittin and δ-haemolysin, have strong similarities to putative membrane spannin... | The Structure and Dynamics of Membrane Spanning Helices by High Resolution NMR and Molecular Dynamics | null |
1988-01-01 | The light-harvesting pigments of phototrophic bacteria belonging to the green sulfur bacteria (Chlorobiaceae) and the green filamentous bacteria Chloroflexaceae) are localised in chlorosomes (Sprague and Varga, 1986). These are flattened cylinders attached to the cellular membrane. They comprise a core of hydrophobic B... | Spin Label Studies on Chlorosomes from Green Bacteria | null |
1988-01-01 | Properties of vortices and dynamic correlation functions have been studied for the two-dimensional classical ferromagnetic Heisenberg model with easy-plane anisotropy, as a function of the anisotropy parameter λ = J_z/J_x. Continuum limit equations of motion exhibit two types of static vortex solutions, with and withou... | Classical Spin Dynamics in the Two-Dimensional Anisotropic Heisenberg Model | null |
1988-01-01 | Solid State NMR has been used to study polymer structure, morphology, and dynamics for nearly 40 years. In the past 15 years with the advent of various methods to manipulate nuclear spin Hamiltonians and advances in theoretical approaches, solid state NMR spectroscopy has advanced to the point that it is the most detai... | Solid State NMR Studies of the Relationship between Polymer Structure/Dynamics at the Segmental level and Macroscopic Physical Properties | null |
1988-01-01 | These lectures describe a few dynamical properties of some statistical mechanics systems such as spin models, automata, neural networks. Two aspects will be mostly discussed: the multivalley structure of phase space (sections II, IV, V, VI, VII, VIII) and the distance between two configurations which evolve according t... | Dynamics of Automata, Spin Glasses and Neural Network Models | null |
1988-01-01 | One outstanding question in bacterial photosynthesis research concerns the relevance of the dimeric nature of the primary donor P for the fast electron transfer step from the first excited singlet state ^1P*H to the charge separated state P^+H^−, where H stands for the intermediate acceptor bacteriopheophytin. This pro... | Molecular Orbital Studies on the Primary Donor P_960 in Reaction Centers of Rps. viridis
| null |
1988-01-01 | Proteins are dynamic systems which exhibit a wide spectrum of motions. During the last several years it has been realized that protein motions are essential to their function [1–5]. It has also become clear that motions and functional processes in proteins span an enormous range of time scales from the subnanosecond to... | Protein Dynamics and the Time Domain | null |
1988-01-01 | Surface interactions between water and polymer networks have a profound effect on the water structure. The properties of water in these, and other, heterogeneous systems are sensitive to the size of the network pores and have been described by the two-phase model which assumes partition of the water between the “bulk” ... | ESR Study of Cu(II) in Polyacrylamide Networks | null |
1988-01-01 | It is unlikely that the Hopfield model will be of much practical use as a stand-alone associative memory for pattern recognition purposes. Its importance lies in its conceptual significance: since 1982 nearly all of the publications in this field have acknowledged the relevance of this model. Several papers have recent... | Dynamics of hopfield associative memories | null |
1988-01-01 | This review article discusses several interesting generalized nonlinear Schrödinger equations (GNLSE) occurring in quantum fluid dynamics for both time-independent and time-dependent situations as well as the possibility of soliton or solitary wave solutions for such equations. It concludes with a brie f report on a ne... | Generalized Nonlinear Schrödinger Equations in Quantum Fluid Dynamics | null |
1988-01-01 | Some of the more common techniques used to study the physical properties of biological membranes include electron microscopy, x-ray and neutron diffraction, Raman spectroscopy, electron spin resonance (ESR), nuclear magnetic resonance (NMR), infrared spectroscopy, fluorescence spectroscopy, and differential scanning ca... | Fluorescence Studies on Prokaryotic Membranes | null |
1988-01-01 | Poly(isoprene-b-styrene) blockcopolymers with deuterated styrene or isoprene segments at the block boundary were investigated by ^2H NMR in a broad temperature range. In each case two thermal transitions are observed, one for segments at the interface, the other for the core of the microdomains. The spectra and the non... | Dynamics At Interfaces | null |
1988-01-01 | I give a brief semihistorical review of progress in understanding spin glasses, with emphasis on the novel features of mean field theory and applications to other “complex systems”: optimization problems and neural networks. | A Brief Introduction to Spin Glasses and Related Complex Problems | null |
1988-01-01 | In recent years much progress has been made in this field, and after a great deal of effort self-consistent mean field approximation has been obtained [1] (sometimes this construction goes under the name of broken replica theory). This theory should be exact for weak long-range forces or when the dimensions of the spac... | Mean Field Theory for Spin Glasses | null |
1988-01-01 | The magnetic behaviour and electronic structure of a dilute transition metal ion in a host metal is the result of a competition between the tendency towards localization of d or f shells, and charge and spin derealization due to hybridization^1. The study of dilute systems is necessary to improve our knowledge about th... | Narrow Linewidth Phenomena of Dilute D and F Atoms in Metals | null |
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