What if the place that we are in the midst of is different from the physical space that we currently inhabit? What if the things we yearn for are located elsewhere, in another place or in a remembered past, and all we now carry within us is an image of this place. We may remember only elements or impressions of it: there may be certain objects, smells, a smile or expression, particular acts or occasions, a word, all of which come out in a manner that we cannot control or understand. Yet any of these ...
Tópico(s): Visual Culture and Art Theory
2008 - Taylor & Francis | Housing Theory and Society
This paper presents evidence for variation in the relative position of NegP within the IP complex from a single language family. Whereas previous studies of the position of NegP have relied on such data as word or affix order, or negative scope, this paper uses evidence from the syntactic interaction of bound and free morphemes to determine the position of NegP relative to TP. The data from the Finno-Ugric languages suggests that there are two sub-groups within this family: Mordva, Mari, Komi, Udmurt, ...
Tópico(s): Natural Language Processing Techniques
1991 - Elsevier BV | Lingua
Produção Nacional
Revisado por pares
Tópico(s): Artificial Intelligence in Games
1989 - Elsevier BV | Trends in Pharmacological Sciences
Abstract Despite developments in both the research and investigative use of criminal profiling over the past four decades, empirical evaluation of the accuracy of the technique, and hence its validity, remains limited. This practice update briefly examines the original empirical experiments conducted in the area thus far as well as recent omnibus analyses aimed at assessing accuracy in criminal profiles. Issues that undermine recently promulgated challenges to profiler accuracy are also identified ...
Tópico(s): Digital and Cyber Forensics
2013 - Taylor & Francis | Journal of Forensic Psychology Practice
The quantum-statistical characteristics of the field at the output port of an interferometer with a phase-conjugate mirror are evaluated. The explicit form of the density matrix of the field at the output port is given. The effect of an attenuator in the other arm of the interferometer is also discussed.
Tópico(s): Laser-Matter Interactions and Applications
1987 - Optica Publishing Group | Journal of the Optical Society of America B
A one-dimensional model is used to study quantum radiation from an infinitesimally thin jellium-type mirror moving nonrelativistically, with special attention to the effects of dispersion on the spectrum, the mean radiative reaction force Frad, and the self-mass. Elementary methods suffice throughout. The mirror′s position and momentum must be treated, initially, as dynamic variables; afterwards one can treat the velocity β(t) as an assigned classical parameter. One component ΔM(1) of the self-mass ...
Tópico(s): Mechanical and Optical Resonators
1995 - Elsevier BV | Annals of Physics
A quantum system composed of a cavity radiation field interacting with a movable mirror is considered and quantum statistical properties of the field are studied. Such a system can serve in principle as an idealized meter for detection of a weak classical force coupled to the mirror which is modelled by a quantum harmonic oscillator. It is shown that the standard quantum limit on the measurement of the mirror position arises naturally from the properties of the system during its dynamical evolution. ...
Tópico(s): Mechanical and Optical Resonators
2000 - IOP Publishing | Journal of Optics B Quantum and Semiclassical Optics
We explore the design of atom-optic components, such as mirrors, to manipulate ultracold atoms. We show that it is possible to enhance significantly quantum effects by engineering sharp features in the interaction potential between atoms and the component. We illustrate the concept by calculating the reflection probability for ultracold sodium atoms incident on a bichromatic evanescent-wave atomic mirror created by lasers red and blue detuned from resonance with intensities and detunings chosen ...
Tópico(s): Quantum Mechanics and Applications
2003 - American Physical Society | Physical Review A
By introducing the notion of mirror substitution, we show that, given a substitutive sequence over two letters, it is palindromic (that is, it contains arbitrarily long palindromes) if and only if its language is mirror-invariant (that is, it is closed under the mirror image map). Then we solve a question of Hof, Knill and Simon in the 2-letter case, and also, by constructing a counterexample, we give a negative answer to the open problem 4 in the webpage: http://iml.univ-mrs.fr/~bernat/openquestions. ...
Tópico(s): Logic, programming, and type systems
2007 - Elsevier BV | Theoretical Computer Science
Quantum information transfer is an important part of quantum information processing. Several proposals for quantum information transfer along linear arrays of nearest-neighbor coupled qubits or spins were made recently. Perfect transfer was shown to exist in two models with specifically designed strongly inhomogeneous couplings. We show that perfect transfer occurs in an entire class of chains, including systems whose nearest-neighbor couplings vary only weakly along the chain. The key to these ...
Tópico(s): Quantum and electron transport phenomena
2005 - American Physical Society | Physical Review A
It is shown that the time needed for light to pass through the optical barrier associated with an antiresonant quarter-wave-stack dielectric mirror, as measured by the group-delay, or phase time, asymptotically reaches a limit that is independent of the barrier thickness and hence of the number of layers. This limit, which scales as the inverse of the refractive-index difference between successive layers, is equal to the mean value of the asymptotic group delays needed for light to reflect off each ...
Tópico(s): Laser-Matter Interactions and Applications
1999 - Optica Publishing Group | Journal of the Optical Society of America B
Today, the technology of the Internet of Things (IoT) experiencing ongoing development can be said to be very rapid.Various office equipment and even city pages have been integrated with the internet.In addition to technological developments also occur in the mirror, smart mirror technology is one of the new things, especially in the field of learning, still in traditional technology where mirrors are only used for mirroring.The use of mirrors in education is not yet desirable, so there is a need ...
Tópico(s): Blockchain Technology in Education and Learning
2020 - | International Journal of Emerging Trends in Engineering Research
We describe an experimental procedure for the reconstruction of the geometrical parameters of a reflecting surface. The method is based on the projection of a luminous pattern constituted by colored points. The successive chromatic selection reduces the complexity of the acquired image. We show that the colors of the points comprising the pattern are modified by the combined effect of the CCD camera and the projection system. In some situations, the chromatic components of the pattern points can ...
Tópico(s): Advanced Vision and Imaging
2006 - SPIE | Optical Engineering
The structure of the diffracted electromagnetic field generated by a paraboloidal mirror having a possible central obscuration without wavefront aberrations, but allowing for defocus, is studied. Particular attention has been paid to the time average electric energy density; numerical results are displayed for various azimuthal lines. Contour plots are shown; as expected they are not rotationally symmetric. Finally, we introduce and numerically evaluate the encircled time average electric energy ...
Tópico(s): Digital Holography and Microscopy
1987 - Optica Publishing Group | Applied Optics
A comprehensive analysis of a system consisting of a flat-plate collector augmented with two reflectors is presented. The model facilitates the prediction of the total energy absorbed by the collector at any hour of the day for any latitude for random tilt angles and azimuth angles of the collector and reflectors. The effect of overlapping of the shadows of the two reflectors has been taken care of. The model was numerically simulated for conditions prevailing in three different Indian stations. ...
Tópico(s): Photovoltaic System Optimization Techniques
1988 - Elsevier BV | Solar Energy
We study intracavity electromagnetically induced transparency in atoms around a nanofiber with a pair of Bragg grating mirrors. We calculate the transmission of the composite cavity-fiber-atom system and the time development of the guided probe light field. We derive analytical approximate expressions for the output probe field and its group delay. We show that the group delay of the guided light substantially depends on the input pulse length, the mirror reflectivity, the atomic number density, ...
Tópico(s): Mechanical and Optical Resonators
2009 - American Physical Society | Physical Review A
Tópico(s): Photovoltaic System Optimization Techniques
1980 - Elsevier BV | Solar Energy Materials
Tópico(s): Statistical Methods and Inference
2007 - Pleiades Publishing | Mathematical Methods of Statistics
To overcome inherent problems with conventional three-dimensional profiling systems based on pattern-projection method, we propose incorporating a digital device, such as a single MEMS mirror in the projection optics. In this system, a projector is controlled to generate a projection pattern with an appropriate periodic structure and sinusoidal intensity distribution. The key aspect to this projection method is that sinusoidal signals are generated by a function generator; that is, the temporal ...
Tópico(s): Image Processing Techniques and Applications
2012 - SPIE | Optical Engineering
The brightness distribution of specularly reflected and diffusely scattered rays off an X-ray mirror illuminated under grazing incidence is determined by the mirror surface topography. An attempt is made to cover the full range of random surface roughness which runs from microscopic to macroscopic imperfections, for which currently available scattering theories cannot be used. In a new attempt the size of geometric slope errors and diffraction angles of a 1-D profile are compared, spatial frequency ...
Tópico(s): Optical Systems and Laser Technology
2005 - SPIE | Proceedings of SPIE, the International Society for Optical Engineering/Proceedings of SPIE
Quantum routers are the necessary elements of the quantum information network, and thus their routing capabilities are particularly important. With the atomic mirrors robustly controlling the reflected or transmitted coefficient of the waveguide photon, we show that a two-level atom can be served as an ideal quantum router to redirect a single photon from the input waveguide into the output waveguides (OWGs) with designable probabilities, e.g., $100%$ for one OWG, $1/2$ to one of the two OWGs, and $ ...
Tópico(s): Cold Atom Physics and Bose-Einstein Condensates
2015 - American Physical Society | Physical Review A
M. A. Cirone, Kazimierz Rzążewski,
The quantum radiation field inside a double cavity is examined. The double cavity consists of a cavity containing a reflecting mirror. Two independent radiation fields are present inside the cavity. It is then assumed that the mirror becomes suddenly transparent. The double cavity transforms thus into a single cavity. The relationship between the radiation fields before and after the change is investigated. It is shown that the sudden change excites the radiation modes of the single cavity. Only ...
Tópico(s): Quantum Information and Cryptography
1999 - American Physical Society | Physical Review A
Tópico(s): Chaos-based Image/Signal Encryption
2017 - Springer Science+Business Media | Applicable Algebra in Engineering Communication and Computing
In the future, faithful exchange of quantum information can become a key part of many computational algorithms. Some authors suggest using chains of mutually coupled spins as channels for quantum communication. One can divide these proposals into the groups of assisted protocols, which require some additional action from the users, and natural ones, based on the concept of state mirroring. We show that state mirroring is fundamentally not the feature of chains of spins-$\frac{1}{2}$ coupled by the ...
Tópico(s): Quantum and electron transport phenomena
2008 - American Physical Society | Physical Review A
The growing role of education in society has actually begun since the division of labor and continues to this day. The highest GDP growth rates in the second half of the twentieth century were due to the development and impact of higher education. Nevertheless, there are growing concerns in the expert community about the controversial development of education in general and the higher education segment in particular; saying that the modern higher education institution has almost lost its influence ...
Tópico(s): Educational Innovations and Challenges
2022 - | Filosofiya osvity Philosophy of Education
The vacuum field's role in the radiative properties of two-level atoms located externally to a phase-conjugate mirror (PCM) is investigated. The basic result of Gaeta and Boyd [ Phys. Rev. Lett.60, 2618 ( 1988)], that the PCM emits an average of R (where R is reflectivity) noise photons per mode of the radiation field, is modified. Stimulated emission of the combined PCM–atom system takes place when the atom is in its ground state; this emission is caused by a scattering–conjugation process of virtual ...
Tópico(s): Laser-Matter Interactions and Applications
1992 - Optica Publishing Group | Journal of the Optical Society of America B
We investigate theoretically the Sisyphus cooling of three-level atoms due to interaction with the evanescent field developed on the surface of a conical-hollow atom trap. We treat the total processes in a fully random way so that quantitative and realistic results are obtained by Monte Carlo simulation. We show that the trapped atoms, when released inside the hollow region, are cooled down to the final temperature of 30 $\ensuremath{\mu}$K, independent of the intial conditions, with negligible loss ( ...
Tópico(s): Quantum Information and Cryptography
1997 - American Physical Society | Physical Review A
An optical probe for profile measurement of mirror surfaces is developed. This probe, consisting of a displacement meter and an angle meter, can detect the displacement and surface slope at one point simultaneously. Both the displacement meter and the angle meter of the probe employ position-sensing detectors (PSDs) as detecting devices. An optical fiber output is used as the light source so that the probe is made compact and has good characteristics. To eliminate influences of light disturbance ...
Tópico(s): Astronomical Observations and Instrumentation
1997 - SPIE | Optical Engineering
This paper presents the results of a theoretical and experimental investigation of a double exposure, flat-plate solar collector with a flat-plate reflective surface. The main role of the reflector, which is placed below and parallel to the collector, is the reflection of solar radiation on the lower absorber surface. To enable absorption from the lower absorber surface, it is necessary for the insulation mounted on the lower part of the collector box to be removed and the lower box surface replaced ...
Tópico(s): Photovoltaic System Optimization Techniques
1980 - Elsevier BV | Solar Energy
Recent progress in quantum optics suggests that quantum computers may one day be built based on single photons routed through a circuit of simple optical elements: mirrors and small bits of glass. Such circuitry would revolutionize information technology, allowing fast solution of some of the most difficult computational problems and enhancing ultrasecure communication systems.
Tópico(s): Quantum Computing Algorithms and Architecture
2002 - American Association for the Advancement of Science | Science