Search results for "Classical"
showing 10 items of 2294 documents
Probing Lorentz invariance and other fundamental symmetries in3He/129Xe clock-comparison experiments
2011
We discuss the design and performance of a very sensitive low-field magnetometer based on the detection of free spin precession of gaseous, nuclear polarized 3He or 129Xe samples with a SQUID as magnetic flux detector. Characteristic spin precession times T*2 of up to 60 h were measured in low magnetic fields (about 1μT) and in the regime of motional narrowing. With the detection of the free precession of co-located 3He/129Xe nuclear spins (clock comparison), the device can be used as ultra-sensitive probe for non-magnetic spin interactions, since the magnetic dipole interaction (Zeeman-term) drops out in the weighted frequency difference, i.e., Δω = ωHe− γHe/γXe·ωXe. We report on searches …
The Heisenberg dynamics of spin systems: A quasi*‐algebras approach
1996
The problem of the existence of the thermodynamical limit of the algebraic dynamics for a class of spin systems is considered in the framework of a generalized algebraic approach in terms of a special class of quasi*-algebras, called CQ*-algebras. Physical applications to (almost) mean-field models and to bubble models are discussed. © 1996 American Institute of Physics.
Apliecība par Pētera Ķiķaukas došanos komandējumā
1924
Apliecība par Pētera Ķiķaukas došanos komandējumā uz Grieķiju, Itāliju un Franciju. Dokuments sastādīts latviešu un franču valodās. Satur Latvijas Universitātes zīmogu un rektora Jāņa Ruberta un sekretāra Aleksandra Valdmaņa parakstus.
Antiquitas Viva: Studia classica
2001
Izdevums tapis ar ERAF projekta „Atbalsts Latvijas Universitātes starptautiskās sadarbības projektiem un citiem starptautiskās sadarbības pasākumiem zinātnē un tehnoloģijās” Nr. 2010/0202/2DP/2.1.1.2.0/10/APIA/VIAA/013 atbalstu
Un’analisi giuridica dell’economia: John R Commons e i Legal Foundations of Capitalism
2015
Legal Foundations of Capitalism by John Roger Commons (1924) challenges both orthodox theories of economics and mainstream legal doctrines, at a time when the social sciences were oriented towards new epistemological approaches. This essay shows how Common’s work overruled the assumptions of that movement which in the 20th century became known as Law and Economics. It is not an attempt to extend economic analysis to the study of law. Instead, it is aimed at the application of legal concepts, terms and definitions to economics, and at making economic phenomena coincide with juridicial ones. The end result is the challenge of both neoclassical economics and of traditional legal theories.
HENSTOCK INTEGRAL AND DINI-RIEMANN THEOREM
2009
In [5] an analogue of the classical Dini-Riemann theorem related to non-absolutely convergent series of real number is obtained for the Lebesgue improper integral. Here we are extending it to the case of the Henstock integral.
Reflections on the Everlasting and the Transient or the Road to the “Freed Field of Light”
2000
The twentieth century is a contradiction-ridden time. Without warning it combines grandiose Utopias and apocalyptic reasonings. It bottles up tragic contradictions, a feeling of insecurity, at times manifestations of despair and feverish activity. In the eyes of a considerable part of society man has lost his divine image, his place in the system of universal value. Consciousness of the loss of sense, the loss of absolute values forms a peculiar background for the cultural processes of the twentieth century. It is this loss of sense that may be the basis for its dualistic and even tragic vision of the world.
Modeling Atmospheric Turbulence via Rapid Distortion Theory: Spectral Tensor of Velocity and Buoyancy
2017
Abstract A spectral tensor model is presented for turbulent fluctuations of wind velocity components and temperature, assuming uniform vertical gradients in mean temperature and mean wind speed. The model is built upon rapid distortion theory (RDT) following studies by Mann and by Hanazaki and Hunt, using the eddy lifetime parameterization of Mann to make the model stationary. The buoyant spectral tensor model is driven via five parameters: the viscous dissipation rate ε, length scale of energy-containing eddies L, a turbulence anisotropy parameter , gradient Richardson number (Ri) representing the local atmospheric stability, and the rate of destruction of temperature variance . Model outp…
Statistical Thermodynamics of Polymer Quantum Systems
2011
Polymer quantum systems are mechanical models quantized similarly as loop quantum gravity. It is actually in quantizing gravity that the polymer term holds proper as the quantum geometry excitations yield a reminiscent of a polymer material. In such an approach both non-singular cosmological models and a microscopic basis for the entropy of some black holes have arisen. Also important physical questions for these systems involve thermodynamics. With this motivation, in this work, we study the statistical thermody- namics of two one dimensional polymer quantum systems: an ensemble of oscillators that describe a solid and a bunch of non-interacting particles in a box, which thus form an ideal…
Validation of buoyancy driven spectral tensor model using HATS data
2016
We present a homogeneous spectral tensor model for wind velocity and temperature fluctuations, driven by mean vertical shear and mean temperature gradient. Results from the model, including one-dimensional velocity and temperature spectra and the associated co-spectra, are shown in this paper. The model also reproduces two-point statistics, such as coherence and phases, via cross-spectra between two points separated in space. Model results are compared with observations from the Horizontal Array Turbulence Study (HATS) field program (Horst et al. 2004). The spectral velocity tensor in the model is described via five parameters: the dissipation rate (), length scale of energy-containing eddi…