Optical vault: reconfigurable bottle beam by conically refracted light

We employ conical refraction of light in a biaxial crystal to create an optical bottle for trapping and manipulation of particles. We show that by just varying the polarization of the input light the bottle can be opened and closed at will. We experimentally demonstrate stable photophoretic trapping and controllable loading and unloading of light absorbing particles in the trap.Comment: 4 pages, 5 figure

Renormalization of Poincare Transformations in Hamiltonian Semiclassical Field Theory

Semiclassical Hamiltonian field theory is investigated from the axiomatic point of view. A notion of a semiclassical state is introduced. An "elementary" semiclassical state is specified by a set of classical field configuration and quantum state in this external field. "Composed" semiclassical states viewed as formal superpositions of "elementary" states are nontrivial only if the Maslov isotropic condition is satisfied; the inner product of "composed" semiclassical states is degenerate. The mathematical proof of Poincare invariance of semiclassical field theory is obtained for "elementary" and "composed" semiclassical states. The notion of semiclassical field is introduced; its Poincare invariance is also mathematically proved.Comment: LaTeX, 40 pages; short version of hep-th/010307

Two-dimensional domain structures in Lithium Niobate via domain inversion with ultrafast light

Periodic inversion of ferroelectric domains is realized in a lithium niobate crystal by focused femtosecond near-infrared laser beam. One and two-dimensional domain patterns are fabricated. Quasi-phase matched frequency doubling of 815nm light is demonstrated in a channel waveguide with an inscribed periodic domain pattern with conversion efficiency as high as 17.45%.Peer ReviewedPostprint (published version

Unveiling the orbital angular momentum and acceleration of electron beams

New forms of electron beams have been intensively investigated recently, including vortex beams carrying orbital angular momentum, as well as Airy beams propagating along a parabolic trajectory. Their traits may be harnessed for applications in materials science, electron microscopy and interferometry, and so it is important to measure their properties with ease. Here we show how one may immediately quantify these beams' parameters without need for additional fabrication or non-standard microscopic tools. Our experimental results are backed by numerical simulations and analytic derivation.Comment: 2 figures in text, 2 in supplementar

Use of Electric Energy in the Construction Industry Republic of Belarus

Секция III : Ресурсо- и энергосберегающие строительные материалы и технологииРассмотрен вопрос решения задачи эффективного использования профицита электроэнергии, возникающего после выхода на полную мощность Белоруской атомной станции. Предложен вариант возможного использования в больших объёмах электроэнергии в одной из ведущих отраслей Белоруссии - строительной отрасли. Рассмотрено решение использования электропрогрева, позволяющего повысить эффективность основного метода интенсификации твердения бетона с использованием электроэнергии.=The issue of solving the problem of efficient use of the surplus of electricity arising after the full capacity of the Belarusian nuclear power plant is considered. The variant of possible use in large volumes of the electric power in one of the leading branches of Belarus - construction branch is offered. The solutions allowing to increase efficiency of the basic method of intensification of hardening of concrete with use of the electric power - electric heating are resulted

Use of Electric Energy in the Construction Industry Republic of Belarus

Секция III : Ресурсо- и энергосберегающие строительные материалы и технологииРассмотрен вопрос решения задачи эффективного использования профицита электроэнергии, возникающего после выхода на полную мощность Белоруской атомной станции. Предложен вариант возможного использования в больших объёмах электроэнергии в одной из ведущих отраслей Белоруссии - строительной отрасли. Рассмотрено решение использования электропрогрева, позволяющего повысить эффективность основного метода интенсификации твердения бетона с использованием электроэнергии.=The issue of solving the problem of efficient use of the surplus of electricity arising after the full capacity of the Belarusian nuclear power plant is considered. The variant of possible use in large volumes of the electric power in one of the leading branches of Belarus - construction branch is offered. The solutions allowing to increase efficiency of the basic method of intensification of hardening of concrete with use of the electric power - electric heating are resulted

Mehanizmi reakcija 27Al(14N, X) pri energiji snopa od 129,3 MeV

Absolute values of differential cross–sections for the formation of 6,7Li, 7,9Be, 10,11B and 12C nuclei were measured by the 14N + 27Al reaction at 129.3 MeV. The analysis of the inclusive energy spectra and angular distributions shows that the carbon and boron fragment production is well described by the projectile break–up leading to three–body final states reactions, while the lighter fragments are due both to the above–mentioned break–up and the evaporation from the 41Ca compound nucleus.Reakcijom 14N +27 Al odredili smo apsolutne vrijednosti diferencijalnih udarnih presjeka za tvorbu jezgri 6,7Li, 7,9Be, 10,11B i 12C pri energiji 129,3 MeV. Analiza inkluzivnih energijskih spektara i kutnih raspodjela pokazuje da se tvorba ugljikovih i borovih fragmenata može dobro opisati rascjepom upadne čestice koji vodi do tri tijela u konačnom stanju, dok su lakši fragmenti posljedica tog procesa i isparavanja iz složene jezgre

Mehanizmi reakcija 27Al(14N, X) pri energiji snopa od 129,3 MeV

Absolute values of differential cross–sections for the formation of 6,7Li, 7,9Be, 10,11B and 12C nuclei were measured by the 14N + 27Al reaction at 129.3 MeV. The analysis of the inclusive energy spectra and angular distributions shows that the carbon and boron fragment production is well described by the projectile break–up leading to three–body final states reactions, while the lighter fragments are due both to the above–mentioned break–up and the evaporation from the 41Ca compound nucleus.Reakcijom 14N +27 Al odredili smo apsolutne vrijednosti diferencijalnih udarnih presjeka za tvorbu jezgri 6,7Li, 7,9Be, 10,11B i 12C pri energiji 129,3 MeV. Analiza inkluzivnih energijskih spektara i kutnih raspodjela pokazuje da se tvorba ugljikovih i borovih fragmenata može dobro opisati rascjepom upadne čestice koji vodi do tri tijela u konačnom stanju, dok su lakši fragmenti posljedica tog procesa i isparavanja iz složene jezgre