publicationDate stringlengths 10 10 | abstract stringlengths 0 37.3k | title stringlengths 1 5.74k | doi stringlengths 11 47 ⌀ |
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1984-01-01 | The subject of domain-wall dynamics in Ising-type ferro- and antiferromagnetic chains has recently become of great interest, since they provide a simple and readily accessible possibility to study nonlinear excitations [1,2]. By Ising-type is meant that there is a preferential direction for the moments, either through ... | Mössbauer Relaxation Studies of π-Domain-Wall Dynamics in Pure and Impure Ising-Type Magnetic Chains | null |
1984-01-01 | The phenomenon of spin transition —equivalent terms found in the literature are spin crossover, magnetic crossover, spin equilibrium—denoted as high spin (HS) ⇄ low spin (LS), may be observed in first-row transition metal complexes with d ^4, d ^5, d^6, d ^7,and d ^8 electron configuration. | Spin Transition in Iron Complexes | null |
1984-01-01 | Excitation of unnatural parity states, predominantly of high spin, using electromagnetic and hadronic probes, is discussed. Spectroscopic strengths are deduced from studies of (e,e’), (p,p’), (π,π’), and (p,n) for states whose “doorway” is the “stretched” particle-hole configuration. These levels are excited primarily ... | Studies of Spin Excitations with Electromagnetic and Hadronic Probes | null |
1984-01-01 | Various aspects of the response of ^208Pb to spin perturbations are considered. Based on a boson exchange picture for the spin channel of the ph interaction the excitation of Gamow-Teller and various transverse magnetic spin states are discussed. We also investigate the role of the tensor force in isoscalar spin states... | Spin Excitations in ^208Pb | null |
1984-01-01 | The spin dynamics of a polarized muon at an interstitial lattice site interacting with four or six nearest neighbouring nuclear spins with J =1/2 has been investigated. The difference from the results of the Kubo-Toyabe theory is pointed out. The interaction of a muon with four nuclei with spin J =1 including both dipo... | Exact calculation of the muon polarization function | null |
1984-01-01 | Carbon is the most important atom in organic and biological chemistry. In nature and in the laboratory we find that the stable (low energy) form of carbon requires the formation of four chemical bonds, i.e., carbon is tetravalent. In this paper we will be concerned with abnormal, high energy and exceedingly reactive fo... | Picosecond Laser Studies on the Effect of Structure and Environment on Intersystem Crossing in Aromatic Carbenes | null |
1984-01-01 | Jensen (e.g., 1980a) has grouped the various criteria for detecting bias in ability tests under two broad headings: internal and external. Studies under the first heading concern themselves with relations among the components of a test; those under the second are concerned with predictive relations between the test as ... | Digits Backward and the Mercer-Kamin Law | null |
1984-01-01 | Electron Nuclear Double Resonance (ENDOR) and Electron Spin Echo (ESE) techniques have been applied to the investigation of several coals. The results of these measurements are compared with analogous studies of pristine polyacetylene, composites of polyacetylene/polyethylene, and of a variety of hydrocarbon radicals. ... | Electron Spin Echo and Endor Studies of Coals | null |
1984-01-01 | For every component in use there are at least three major processes for its creation. The first stage is the conceptual stage when a component is designed to be made of a certain material with a specific tolerance dimension, to undertake certain loads or stresses, and to serve for a designated number of years in a high... | Ultrasonic Imaging Analysis of Component Integrity | null |
1984-01-01 | The importance of cellular processes associated with interfaces is well established in many biological disciplines. In microbiology, however, this realization has been gained only recently for reasons discussed elsewhere (10). Biofilms are defined here as microorganisms and extracellular products associated with a subs... | Biofilm Development and Its Consequences | null |
1984-01-01 | The curse of inelastic nucleon scattering and charge exchange has always been the enormous complexity of the nucleon-nucleon (N-N) interaction. This complexity, however, can also be viewed as the ultimate promise of nucleons as probes of nuclear structure, Given an adequate theoretical basis, inelastic nucleon scatteri... | Spin Observables in Nucleon-Nucleus Scattering | null |
1984-01-01 | An exact Monte Carlo method for calculating thermodynamic properties of quantum spin systems is described. As an example we study the spin 1/2 Heisenberg hamiltonian with ferromagnetic nearest neighbour interactions in one dimension. Extension of the method to the antiferromagnetic system will be discussed briefly. | A Quantum Monte Carlo Method for the Heisenberg Spin System | null |
1984-01-01 | In recent years there has been a burst of interest in what is called the spin-glass problem. This concerns the nature of the magnetic state of systems containing a distribution of magnetic-moment-carrying atoms distributed with some degree of randomness (generally on a small fraction of the atomic sites of a metal crys... | The Origins and Influences of the Spin-Glass Problem | null |
1984-01-01 | The paper discusses the characteristics of neutron scattering and μ SR in order to find the collaborating works with both techniques. The discussions are made on four subjects, random spin systems, itinerant electron magnetism, surface and real time spectroscopy, with some detailed discussions on the cluster spin glass... | Neutron scattering and μSR | null |
1984-01-01 | It has been known For some time [1–4] that the classical XY-model in one and two dimensions shows behavior which is governed by nonlinear excitations. | Nonlinear Excitations in the Classical XY-Model | null |
1984-01-01 | We consider the zero field depolarization of stationary muons at various sites in fcc and bcc crystals. Significant derivations from the classic Kubo-Toyabe treatment are explained as due to violations of some fundamental assumptions underlying this theory. | Zero field muon spin depolarization revisited | null |
1984-01-01 | Competition between exchange couplings is the well known mechanism [1] giving non collinear spin configuration in an Heisenberg model and here we discuss two different situations. First we consider the case of competition between couplings in the basal plane as is the case, for instance,of compounds of the NiBr_2 famil... | Helimagnetism in the Heisenberg Model: New Features and Old Mechanisms | null |
1984-01-01 | We review abelian (Dirac type) monopole solutions in an increasing number of dimensions. In doing so, we tie together three remarkable ideas, all of which date back to the twenties and thirties; the Dirac monopole (1931), the Hopf map (bundle) (1931) and the Kaluza-Klein dimensional reduction (compactification) scheme.... | Dirac Monopoles, from d = 2 to d = 5, Lecture I | null |
1984-01-01 | Compared to ESR Spectroscopy, the interaction between the magnetic particles and the external magnetic field is much weaker in NMR. The resonance frequency is therefore much smaller and can be found in the range of radio frequencies (corresponding to wavelengths of 1 to 10m)^1, 2). As discussed in Chap. 8, the main rea... | Nuclear Magnetic Resonance (NMR) Spectroscopy of Polymers | null |
1984-01-01 | Domain wall-type excitations in an anisotropic ferromagnet | null | |
1984-01-01 | The distribution of amphiphilic molecules between membrane and buffer solutions, containing the amphiphile aggregates, is described by a simple model. The phenomenological relations describing the partitioning were derived and compared with the electron paramagnetic resonance measurements of the bovine erythrocyte-spin... | Spin Label Study of Molecular Aggregates | null |
1984-01-01 | Within the framework of the Kubo-Toyabe theory the zero-field longitudinal spin relaxation is calculated for the redistribution of positive muons between a metastable and a stable site as a function of the transition frequency from the metastable to the stable site. The results are applied to Clawson's zero-field longi... | Zero-field muon-spin relaxation due to transitions between metastable and stable μ^+sites | null |
1984-01-01 | We present a theory of the coexistence of superconductivity and antiferromagnetism. The diagonal part of the interaction between the magnetic ions and the conduction electrons is included with the electronic kinetic energies, to give new “magnetic Bloch states”, in which electrons of opposite spin are also spatially di... | The Coexistence of Superconductivity and Antiferromagnetism | null |
1984-01-01 | One of the more interesting features of magnetic chains is the lack of spontaneous magnetisation at any finite temperature.In one dimension (1-D) this result is quite general and holds irrespective of the quantum or classical nature of the system, as well as of the presence of exchange or single-ion anisotropies [1]. I... | Classical Ferromagnetic Chain in a Field; Spin-Waves Versus Non-Perturbative Interactions | null |
1984-01-01 | The study of one-dimensional materials has proved fruitful because computational difficulties are reduced while the underlying physics is maintained. Effectively one-dimensional magnetic materials do exist in nature with magnetic interactions that can be well characterized [1]. The pathological nature taken on by fluct... | Spin Waves in a One-Dimensional Antiferromagnetic Insulator | null |
1984-01-01 | Observed abrupt and stepwise changes in crossbridge state induced by MgPPi in skeletal fibers using spin label techniques as well as stepwise changes in sarcomere length in actively contracting fibers are considered in terms of a model based on the principles of catastrophe theory and nucleation of structural transitio... | Stepwise Changes in Crossbridge State and Sarcomere Length: Do Lattice Constraints Play a Critical Role? | null |
1984-01-01 | We show that the statistical mechanics of Isi-ng models can be conveniently reformulated in terms of the local magnetic field probability-distribution function P(h). Analytic results are presented for the 2D square net Ising ferromagnet and Monte Carlo results for the 3D simple cubic Ising ferro-magnet. We also give re... | Local Magnetic Field Distributions in Ising Models | null |
1984-01-01 | If a K_α ray of the quasi atomic protonium system is detected, the annihilation occurs from the fundamental state which is either a ^1S_° or a ^3S_1 state. It is obvious that the annihilation from the ^1S_° state is isotropic. Anisotropy can occur in ^3S_1 state annihilation if the three magnetic substates m = 1, 0, -1... | Angular Correlation between Annihilation Products and K_α X Ray in pp̄ Annihilation at Rest | null |
1984-01-01 | Sodium dibutylphosphate micellar solutions were investigated by ^31P, ^13C and ^23Na NMR as well as by ESR, using VO^2+ as paramagnetic probe, the CMC being determined by conductometry. The aggregation number of DBP^− was estimated from the reorientation correlation time of the vanadyl probe bound to the surface of mic... | NMR and ESR Studies of Dibutylphosphate Micellar Aggregates | null |
1984-01-01 | Many of the contributions in this volume are concerned with the physical measurement and biochemical regulation of membrane lipid fluidity in prokaryotic microorganisms. This contribution is primarily concerned with the biological function of such regulatory mechanisms and with the physiological consequences of their a... | The Relationship between Membrane Lipid Fluidity and Phase State and the Ability of Bacteria and Mycoplasmas to Grow and Survive at Various Temperatures | null |
1984-01-01 | Neutron inelastic scattering is one of the most powerful methods for investigating the excitations in solids because the kinetic energy of a thermal neutron falls in the same range as typical excitations in solids. In a scattering event a large relative change usually occurs in the kinetic energy and this is easily mea... | Neutron Inelastic Scattering as a Probe of Moments in Metallic Systems | null |
1984-01-01 | MANDELBROT [1] has observed that shapes occurring in nature often look highly fragmented. Such shapes, known as fractals, can be attributed to coastlines, the mammalian brains, and so on. The length or volume of such objects depends on the length scale used. Consider, for instance, the Sierpinski gasket. To construct t... | Frustration on Fractals | null |
1984-01-01 | The transition from localized-, to itinerant-electron behaviour in both crystalline and disordered systems gives rise to marked changes in transport properties. Equally impressive are the changes in magnetic susceptibility and electron-, and nuclear-spin characteristics, e.g. resonance frequency, relaxation rates, etc.... | Magnetism and Magnetic Resonance Across the Metal-Nonmetal Transition | null |
1984-01-01 | The basic ideas of the correlation theory for magnetic excitations are presented. It includes self-consistently pair correlation effects and a self-consistent renormalization and damping of the excitations. Applications to the ideal Heisenberg ferromagnet EuO in the paramagnetic phase, to the singlet-doublet magnet Pr,... | Correlation Theory of Magnetic Excitations | null |
1984-01-01 | The anharmonic oscillator theory is applied to the nonuniformly doped, electrically conducting, trans-polyacetylene (CH)_x chain, as well as the long Josephson junction with varying bias current. The variations in bias current determine the number of fluxons on the Josephson junction. As the soliton is the equivalent o... | Nonlinear Mechanisms in Molecular Energy Transfer | null |
1984-01-01 | The introduction of high-flux high-energy pulsed neutron sources may allow the study of electronic transitions and elementary excitation phenomena not previously accessible by inelastic neutron scattering techniques. Magnetic scattering from semiconductors and ferromagnetic transition metals are two important areas of ... | Band Structure Effects in the Electronic Properties of Solids Accessible in Neutron Scattering Studies | null |
1984-01-01 | Studies of p̄p → ȲY reactions near threshold offer an excellent opportunity to examine carefully the dynamics of strangeness exchange. In particular, the measurement of differential cross sections, final state polarizations and spin correlations will provide stringent tests of quark and/or meson exchange model calculat... | A Study of the p̄p → ȲY Reaction at Threshold Using Lear | null |
1984-01-01 | Why do we forget things we once knew? Efforts in answering this important question have not been successful and perhaps because of this, newer theoretical perspectives have bypassed the question, placing more emphasis on encoding or learning. The newer thinking is that faulty memory is largely a consequence of inadequa... | Memory Stores: Storage and Retrieval | null |
1984-01-01 | This chapter is intended to provide an introductory and largely self-contained review of selected topics in the area of phase transitions and dimensionality. Suitable background material may be found on the solid-state aspects in the book by Ashcroft and Mermin^(69) and on statistical physics in the work of Landau and ... | Phase Transitions and Dimensionality | null |
1984-01-01 | There is no doubt that Nuclear Magnetic Resonance (NMR) will in a very close future be the basis of medical imaging. NMR studies have already proven to be useful in brain edema^10 or in brain tumor studies^8.13. However, the biological basis of the reported changes in NMR relaxation times of pathological tissues is not... | NMR Studies of Brain Edema and Tumor Tissues in Stereotactic Biopsies: Correlation With Physical And Histopathological Parameters | null |
1984-01-01 | Muonium-substituted organic free radicals are observed by muon spin rotation when positive muons are stopped in liquid unsaturated compounds. From muon precession frequencies in high external magnetic fields the isotropic muon-electron hyperfine coupling constants are determined. They lead to radical structure assignme... | Positive muons as probes in liquid phase free radical chemistry: Radical structures and reaction rates | null |
1984-01-01 | Paramagnetic relaxation induced in the octanoate chain by manganese and nickel ions has been measured at 2 observation frequencies. The concentration dependence allows the free monomer contribution to be separated from that due to the micelles. | An NMR Study of Paramagnetic Relaxation Induced in Octanoate Micelles by Divalent Ions | null |
1984-01-01 | In these lectures we present an introduction to the method of stochastic quantization due to Parisi and Wu and demonstrate the equivalence between stochastic and canonical methods of quantization in perturbation theory using the techniques due to Floratos and Iliopoulos. The lower critical dimension of spin systems wit... | Stochastic quantization, associated supersymmetry and Nicolai map | null |
1984-01-01 | Two major improvements in NMR instrument capability for applications to solid samples have recently been made commercially available through JEOL and CHEMAGNETICS. It is now possible to obtain variable temperature magic-angle spinning operation on a broad band solid-state probe system. In the present article we present... | Instrumentation Considerations in Solid State NMR Analysis | null |
1984-01-01 | In this lecture we discuss an attempt to obtain a rigorous control of the models of equilibrium statistical mechanics and Euclidean quantum field theory with the spins (fields) transforming under the fundamental representation of 0(N) for N large. Our approach is based on a renormalization group (RG) analysis, see [16]... | Rigorous Renormalization Group and Large N | null |
1984-01-01 | We discuss the relation between collective behavior of many body systems and geometrical concepts. Specifically we shall reexamine the microscopic description of nuclear collective motions and their relation with the symplectic geometry of the A-nucleon system. | Geometry of nuclear collective motions | null |
1984-01-01 | Among the more polar lipid constituents that contribute to the lipid bilayer of biological membranes, the glycosphingolipids show certain typical and remarkable features. Unlike the phospholipids, the glycosphingolipids occur characteristically in all animal cells concentrated at the outer leaflet of the lipid bilayer ... | Studies on the Distribution of Glycosphingolipids in Biomembranes | null |
1984-01-01 | Vibronic effects directly influence resonance interactions of a system with external perturbations and play a role in spectroscopic methods of research over the whole range of electromagnetic waves from radio frequencies through infrared, visible and ultraviolet to X-ray and hard γ quanta, as well as ultrasonics. | Applications to Spectroscopy | null |
1984-01-01 | Conventional ideas on the phase behavior (at temperature T = 0) of antiferromagnetic (AFM) quantum spin chains have recently been challenged by an interesting conjecture of HALDANE [1]. According to Haldane, half-integer spin chains should behave like the exactly solvable spin-1/2 XXZ model, with a gapless phase for pl... | Quantum Spin Chains: Phase Behaviour and Dynamic Excitations | null |
1984-01-01 | The methods of X-ray and neutron small-angle scattering on dilute solutions have been used to obtain structural information on plasma, High Density (HDL) and Low Density Lipoproteins (LDL). The structural principle emerging is remarkably simple and can be related in a logical way to the molecular properties of the lipi... | The Structure of Plasma Lipoproteins: Evaluation by X-Ray and Neutron Small-Angle Scattering | null |
1984-01-01 | The basis of ESR spectroscopy is absorption of electromagnetic radiation by unpaired electrons in a magnetic field ^1,5–9). Unpaired electrons are characterised by an angular momentum, the “spin”, which is connected with a magnetic moment (Chap. 8). This magnetic moment is influenced by external magnetic fields in such... | Electron-Spin-Resonance (ESR) Spectroscopy of Polymers | null |
1984-01-01 | These lectures are concerned with methods of treating magnetic response within the framework of band theory. These methods have mostly been developed with application to transition metals and alloys in mind, and such applications form the central core of the present material. However, we shall attempt to discuss the ex... | “Band Based” Methods for Magnetic Response | null |
1984-01-01 | The molecular components of biomembranes exist in a highly dynamic state, and an increasing body of evidence indicates the involvement of membrane fluidity in the control of membrane-linked processes.^1 The term “fluidity” is imprecise and elusive in its physical meaning; it is used as a bulk thermodynamic property, or... | Membrane Fluidity | null |
1984-01-01 | The main spin interactions in NMR—chemical shift, magnetic dipole-dipole, nuclear electric quadrupole and indirect nuclear spin-spin (J) coupling—are introduced in terms of their effects on line widths in NMR. The relationships between NMR in liquids and solids are discussed. The techniques of decoupling and magic-angl... | Line-Broadening Influences and Line-Narrowing Techniques in Solid State NMR | null |
1983-12-01 | Using a source of^181Tb, we have observed a substantial linewidth anomaly in the^161Dy Mössbauer Effect just above the Curie temperature of Gd. Preliminary analysis of the anomaly is consistent with behavior expected for critical spin dynamics. Uncertainty in the Curie temperature prevents conclusive analysis of the li... | Nuclear spin relaxation of^161Dy in Gd above the Curie temperature observed with the Mössbauer effect | null |
1983-12-01 | The time-differential perturbed angular γ-ray distribution method in connection with heavy-ion reactions and recoil implantation techniques allows microscopic measurements of the local susceptibility and 4f spin dynamics of extremely dilute 4f ions in many simple metals over wide temperature ranges. By applying these t... | Formation and dynamics of local 4f moments in metals | null |
1983-11-01 | A comparison is made of the experimentally observable positions and intensities of bulk and surface spin waves in single-crystal films of iron-manganese spinels of different thickness with computed values. The computation is performed within the framework of the theoretical model of a surface inhomogeneity with changes... | Influence of magnetization inhomogeneity on the spin-wave resonance spectrum in single crystal films of iron-manganese spinels | null |
1983-10-01 | Role of spin effects in the growth of the total cross sections of nucleon-nucleon scattering at superhigh energies | null | |
1983-10-01 | Presenting some recent considerations and results, the present paper deals with two basic concepts of the continuum mechanics: strain-and stress-rates. Upon a brief systematic survey of concepts of strain and stress, a so far unknown explicit expression for the rate of the right stretch tensor is offered in absolute no... | Recent investigations on strain and stress rates in nonlinear continuum mechanics | null |
1983-09-01 | High spin states in^189Hg have been studied using the^181Ta(^14N, 6 n ) reaction. The various one- and three-quasiparticle rotational bands were interpreted within the cranked shell model. The band-crossing frequencies are found to depend on the number of spectator particles. The effect can be accounted for by a residu... | Rotation aligned bands and configuration dependent interaction in^189Hg | null |
1983-09-01 | Electron spin resonance (ESR) studies were conducted on human platelet plasma membranes using 5-nitroxide stearate, I(12,3). The polarity-corrected order parameter S and polarity-uncorrected order parameters S ( T _‖) and S ( T _⊥) were independent of probe concentration at low I(12,3)/membrane protein ratios. At highe... | Thermotropic lipid phase separations in human platelet and rat liver plasma membranes | null |
1983-09-01 | Investigation of the shape of the free surface of the liquid in the case of planing of a plate of finite span | null | |
1983-09-01 | In this paper a long-range interacgion approximation for spin glasses is proposed as an alternative to the Sherrington-Kirkpatrick model. The one-dimensional model of Ising spins with the interaction κ V _O cos Q x exp (−κ|x|), where κ≪ c ≪ Q ( c is the spin concentration) is studied in detail. The long-range approxima... | One-dimensional spin glass with oscillating long-range interaction | null |
1983-07-01 | The behavior of an impurity spin in a one-dimensional chain is investigated using the Glauber model. Two different types of impurities are considered and exact expressions for the average spin of the impurity, given that the impurity was initially excited out of equilibrium, are found. The behavior of these models is d... | Impurity dynamics in a one-dimensional chain | null |
1983-07-01 | The quark spin content of the nucleons is subjected to constraints implied by sum rules due to global approximate chiral symmetries and perturbative qcd effects. The model, so obtained, has a large polarisation residing in the flavour singlet constituents of hadron. Predictions for the expected longitudinal and transve... | Spin structure of nucleon | null |
1983-06-01 | We have performed electron paramagnetic resonance (e.p.r.) experiments on spin-labelled myosin heads in glycerinated insect flight muscle fibres and myofibrils in rigor. Conventional e.p.r. was used to determine the orientation distribution of spin labels relative to the fibre axis, and saturation transfer e.p.r. was u... | Orientation and rotational mobility of spin-labelled myosin heads in insect flight muscle in rigor | null |
1983-06-01 | Superconductivity in spin glass | null | |
1983-05-01 | Size-specific mortality rates and growth rates for the solitary coral Balanophyllia elegans are determined from size—frequency distributions of live corals from natural and artificial substrates, and from skeletons of dead corals found in rubble channels. Marked quadrats were monitored to measure actual recruitment and... | Population dynamics and life history of a solitary coral, Balanophyllia elegans, from Central California | null |
1983-01-01 | The dynamics of the spin transitions governing the magnetic field dependence of radical pair processes, triplet quenching by radicals and triplet — triplet annihilation in condensed media is considered. The spin dynamics are induced by the hyperfine interaction and by the zero field splitting and include the Zee— mann ... | Ensemble Averaged Spin Pair Dynamics of Doublet and Triplet Molecules | null |
1983-01-01 | It is shown, using a few examples, that laser flash spectroscopy and pulse radiolysis are convenient methods for studying the structure and dynamics of proteins and their interactions with nucleic acids or polynucleotides. In the case of hemoproteins the short duration of the laser pulse makes it possible to follow con... | Fast Kinetic Spectroscopies: Laser Flash Photolysis and Pulse Radiolysis: Application to the Study of the Structure, the Dynamics and the Interactions of Biological Molecules | null |
1983-01-01 | In this chapter we want to account briefly for spin-lattice relaxation, i.e. the loss of order or the increase in entropy of the spin system due to interactions with the lattice. The general relaxation theory is outlined in Appendix I. For additional information the reader is referred to the fundamental books by Abraga... | Spin-Lattice Relaxation | null |
1983-01-01 | Summary This document is part of Subvolume A ‘Electrical Resistivity, Kondo and Spin Fluctuation Systems, Spin Glasses and Thermopower’ of Volume 15 ‘Metals: Electronic Transport Phenomena’ of Landolt-Börnstein - Group III Condensed Matter. | 2.1.1.1 General remarks | null |
1983-01-01 | A survey is given of recent experimental and theoretical results concerning long-range Heisenberg spin glasses in a magnetic field, together with a tentative interpretation of certain formal aspects of the theory in physical terms. | Long-range Heisenberg spin glasses in a magnetic field: Theory and experiment | null |
1983-01-01 | Biological membranes are the supramolecular structures which define the boundary of the cell and its organelles, and which control communication between the exterior and interior. As such they constitute one of the basic organizing principles of biological organisms. In this chapter a review will be given of the overal... | Biomembranes | null |
1983-01-01 | The Darmstadt-Heidelberg-crystal-ball | null | |
1983-01-01 | In the past ten years, excitation transfer processes between molecules in condensed phases have been studied in a variety of systems and by a number of methods. However, the naphthalene dimer systems first studied experimentally by Schwoerer and Wolf [1] and theoretically by Haken and Reineker [2] remain the most beaut... | Energy Transfer in Molecular Crystals and Its Influence on Spin Resonance | null |
1983-01-01 | The nature of the frozen spin glass phase is discussed, paying particular attention to the methods of statistical mechanics needed to treat it. A phenomenological approach is advocated. Suggestions are made for the characterization of the possible frozen components and their time, temperature, field, and system-size (N... | Broken ergodicity in spin glasses | null |
1983-01-01 | The discovery of resistivity minima in metals at low temperatures dates back some fifty years, and yet the evolution of a successful theoretical account of the basic anomaly continues to this date. Originally observations^1 on Mg, Mo, Te, Co and Pd yielded dramatic departures from the expected resistivity variation 1 $... | Re-Entrant Superconductivity | null |
1983-01-01 | Experimental aspects associated with the two magnetic isotopes of nitrogen, ^14N (natural abundance = 99.6%, spin quantum number = 1) and ^15N (natural abundance = 0.4%, spin quantum number = 1/2) are discussed briefly. General relationships of molecular structure to nitrogen chemical shifts and spin-spin coupling cons... | Nitrogen Nuclear Magnetic Resonance Spectroscopy | null |
1983-01-01 | Recent years have seen an intense interest on the part of inorganic chemists in magneto-structural correlations in transition-metal salts, particularly cluster systems. This is evidenced by the large fraction of papers in journals like Inorganic Chemistry which deal in one way or another with magnetic interactions betw... | Ferromagnetism in Linear Chains | null |
1983-01-01 | Spin effects are generally thought to be inessential complications in particle physics. The discovery of large spin-dependent terms in recent pp and np experiments with polarized particles, which have been discussed extensively in the previous Proceedings of this conference,^1 shows that this is not the case. I shall s... | Large Magnetic Moment Effects at High Energies and Composite Particle Models | null |
1983-01-01 | The spin glass: Still a problem? | null | |
1983-01-01 | Relativistic spinning particles | null | |
1983-01-01 | This article concerns magnetism in nonmetallic solids. The analogy between magnons and phonons is established. Then, the exact 1- and 2-magnon spectra of ferromagnets are obtained, with bound states and scattering states being analyzed separately. The many-magnon states are obtained in a low-density approximation, and ... | From Magnons to Solitons | null |
1983-01-01 | The subject of spin glasses has received a great deal of attention for over a decade [1,2]. Though enormous amounts of time and effort have gone into understanding these systems, for the most part, the effort has not been terribly successful. While a number of advances have been made, a basic, fundamental understanding... | Spin Glasses: Irreversibility, Metastability and the Free Energy Surface | null |
1983-01-01 | Spatial fluctuations in spin glasses are studied by an expansion around the dynamic mean field theory. We discuss the properties of the low temperature phase, in particular the stability and consistency of mean field theory and identify the most divergent fluctuations and the resulting special dimensionalities of the m... | A study of short-range spin glasses | null |
1983-01-01 | In this paper a new technique is analyzed to solve certain mean-field models, with particular emphasis on the spin-glass case. We also present an extended Gibbs formalism which is based on the observation that every equilibrium state can be decomposed uniquely into its ergodic components, and apply it to spin-glasses. | Equilibrium theory of spin glasses: Mean-field theory and beyond | null |
1983-01-01 | The purpose of this paper is to summarize some of the research activities recently performed at the Laboratorium voor Hoge Magneetvelden at the University of Nijmegen The scope here and unifying aspect is magnetically induced phase transitions. Here we summarize transitions in the settling velocity of paramagnetic aggr... | Phase transitions in high magnetic fields | null |
1983-01-01 | The scattering of thermal neutrons provides us with an exceedingly powerful probe for studying condensed matter. This usefulness arises from the fact that thermal (300 K) neutrons have a wavelength λ ≃ 1.6 Å. This means that their energy and wavelength are comparable to those of the excitations in solids. In fact, neut... | Neutron Scattering | null |
1983-01-01 | Spontaneous associations between lipids and proteins, especially the dynamics of these associations, are of interest to biologists and physical chemists. A complete description of the lipid-protein organization in membranes will come from convergent studies. At the present time, different approaches to lipid-protein as... | ESR and NMR Studies of Lipid-Protein Interactions in Membranes | null |
1983-01-01 | Nonleptonic weak decays of strange hadrons are complicated by the interplay of weak and strong interactions. Models based either on symmetry properties or on the selection of certain types of diagrams are both open to criticism. The symmetries used are all broken in strong interactions, and the selection of some diagra... | Why Most Flavor Dependence Predictions for Non-Leptonic Charm Decays are Wrong | null |
1983-01-01 | In a textbook dedicated to photoresponsiveness in biological systems, a detailed discussion of the role and importance of light in living organisms is surely not necessary. Nor does it appear useful to present another review on photoinduced conformational changes in polypeptides when an up-to-date one is in press (1). ... | Spectroscopic Studies of Conformational Changes in Photochromic Polypeptides | null |
1983-01-01 | In order to understand the dynamics of an ecosystem, it is necessary to determine the contribution of the different groups to total biomass as well as to evaluate their turnover rates and the amount of organic matter that each produces per unit time. Therefore, the zooplankton and zoobenthos production were studied as ... | Secondary production (zooplankton and benthos) | null |
1983-01-01 | It frequently happens that one must calculate the reliability of systems, the deterministic behavior of which is described by complicated computer codes. Safety against partial or total collapse of reinforced concrete structures under earthquake loads is one example. Sources of uncertainty are numerous. They include in... | Seismic Safety of Reinforced Concrete Frames | null |
1983-01-01 | Studies of behavior often produce substantial quantities of data involving multiple behavioral characteristics, frequently for a number of subjects. In many cases, quantitative analyses are required in order to summarize and simplify available information to a readily understandable level. It can be this very exercise ... | Application of Numerical Taxonomic Techniques in the Study of Behavior | null |
1983-01-01 | In this chapter we shall turn our attention to the static response of systems in which interactions among the constituents, either localized moments or itinerant electrons, may lead to long-range order. A thorough treatment of such interactions and the resulting phase transition is an extremely complicated subject. Alt... | The Static Susceptibility of Interacting Systems | null |
1983-01-01 | This chapter is devoted to a general discussion about relaxation in nuclear magnetic resonance with a special emphasis on the physical signification of concepts, equations, and terms usually used in this field. Systems which are moved away from equilibrium after a change in one of the variables of state will reach the ... | Relaxation Processes in Nuclear Magnetic Resonance | null |
1983-01-01 | Metallothioneins are metal-binding proteins playing a major role in the metabolism and the detoxification of the essential trace metals Zn and Cu and of nonessential d^10 metals such as Cd, Hg, Ag, Au and Bi. These functions are related to the capacity of these proteins to bind 7 bivalent metal ions per polypeptide cha... | Mammalian Metallothionein: Evidence for Metal Thiolate Clusters | null |
1983-01-01 | In this contribution to the proceedings I carried out the full chronological line in numerical simulations to give clear evidence against a phase transition in shortrange spin glass models at least in two dimensions. Furtheron I consider the observation time necessary to obtain equilibrium states at low temperatures — ... | Numerical simulations of spin glasses | null |
1983-01-01 | In recent years considerable progress has been made in relating the macroscopic aspects of diffusion, described by the diffusion coefficient D as defined through Fick’s law, to the microscopic movements of individual atoms or molecules. Much of this progress has become possible with the development of new and powerful ... | Theory of Correlation Effects in Diffusion | null |
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