222 research outputs found
Π Π°Π·ΡΠ°Π±ΠΎΡΠΊΠ° ΠΎΡΠ½ΠΎΠ²Π½ΠΎΠ³ΠΎ ΡΠ΅ΠΏΠ»ΠΎΠ²ΠΎΠ³ΠΎ ΠΎΠ±ΠΎΡΡΠ΄ΠΎΠ²Π°Π½ΠΈΡ ΡΡΡΠ°Π½ΠΎΠ²ΠΊΠΈ ΠΏΠΎΠ»ΡΡΠ΅Π½ΠΈΡ ΡΠ΅ΡΡΠΈΡΠΎΠ²ΡΡ ΠΌΠ°Π³Π½ΠΈΡΠΎΠ²
Π Π΄Π°Π½Π½ΠΎΠΌ Π΄ΠΈΠΏΠ»ΠΎΠΌΠ½ΠΎΠΌ ΠΏΡΠΎΠ΅ΠΊΡΠ΅ ΡΠ°Π·ΡΠ°Π±ΠΎΡΠ°Π½Π° Π°ΠΏΠΏΠ°ΡΠ°ΡΡΡΠ½ΠΎ-ΡΠ΅Ρ
Π½ΠΎΠ»ΠΎΠ³ΠΈΡΠ΅ΡΠΊΠ°Ρ ΡΡ
Π΅ΠΌΠ° ΡΡΡΠ°Π½ΠΎΠ²ΠΊΠΈ ΠΏΠΎΠ»ΡΡΠ΅Π½ΠΈΡ ΡΠ΅ΡΡΠΈΡΠΎΠ²ΡΡ
ΠΌΠ°Π³Π½ΠΈΡΠΎΠ². Π Π°Π½Π°Π»ΠΈΡΠΈΡΠ΅ΡΠΊΠΎΠΌ ΠΎΠ±Π·ΠΎΡΠ΅ ΡΠ°ΡΡΠΌΠΎΡΡΠ΅Π½Ρ ΡΠ²ΠΎΠΉΡΡΠ²Π° ΠΈ ΡΠΏΠΎΡΠΎΠ±Ρ ΠΈΠ·Π³ΠΎΡΠΎΠ²Π»Π΅Π½ΠΈΡ ΡΠ°Π·Π»ΠΈΡΠ½ΡΡ
ΠΌΠ°Π³Π½ΠΈΡΠΎΠ²: Π½Π° ΠΎΡΠ½ΠΎΠ²Π΅ ΠΎΠΊΡΠΈΠ΄ΠΎΠ² ΠΆΠ΅Π»Π΅Π·Π°, Π±Π°ΡΠΈΠ΅Π²ΡΠ΅ ΠΈ Ρ
ΡΠΎΠΌΠΎΠ±Π°ΡΠΈΠ΅Π²ΡΠ΅ ΠΎΠΊΡΠΈΠ΄Π½ΡΠ΅ ΡΠ΅ΡΡΠΎΠΌΠ°Π³Π½Π΅ΡΠΈΠΊΠΈ, Π° ΡΠ°ΠΊΠΆΠ΅ ΠΎΠΊΡΠΈΠ΄Π½ΡΠ΅ ΡΠ΅ΡΡΠΎΠΌΠ°Π³Π½Π΅ΡΠΈΠΊΠΈ Π½Π° ΠΎΡΠ½ΠΎΠ²Π΅ ΡΠ²ΠΈΠ½ΡΠ°. ΠΠ»Ρ ΠΈΠ·Π³ΠΎΡΠΎΠ²Π»Π΅Π½ΠΈΡ ΡΠ΅ΡΡΠΈΡΠΎΠ²ΡΡ
ΠΌΠ°Π³Π½ΠΈΡΠΎΠ² Π²ΡΠ±ΡΠ°Π½ ΠΌΠ΅ΡΠΎΠ΄ ΠΏΠΎΡΠΎΡΠΊΠΎΠ²ΠΎΠΉ ΠΌΠ΅ΡΠ°Π»Π»ΡΡΠ³ΠΈΠΈ. ΠΠΎΠ΄ΠΎΠ±ΡΠ°Π½Π° Π°ΠΏΠΏΠ°ΡΠ°ΡΡΡΠ° Π°Π²ΡΠΎΠΌΠ°ΡΠΈΠΊΠΈ Π΄Π»Ρ ΡΠΏΡΠ°Π²Π»Π΅Π½ΠΈΡ ΠΈ ΠΊΠΎΠ½ΡΡΠΎΠ»ΠΈΡΠΎΠ²Π°Π½ΠΈΡ ΡΠ΅Ρ
Π½ΠΎΠ»ΠΎΠ³ΠΈΡΠ΅ΡΠΊΠΎΠ³ΠΎ ΠΏΡΠΎΡΠ΅ΡΡΠ°. ΠΡΠΏΠΎΠ»Π½Π΅Π½Ρ ΡΠ΅Ρ
Π½ΠΎΠ»ΠΎΠ³ΠΈΡΠ΅ΡΠΊΠΈΠΉ ΠΈ ΠΏΡΠΎΡΠ½ΠΎΡΡΠ½ΠΎΠΉ ΡΠ°ΡΡΠ΅ΡΡ Π²ΠΈΠ±ΡΠΎΠΌΠ΅Π»ΡΠ½ΠΈΡΡ, Π° ΡΠ°ΠΊΠΆΠ΅ ΡΠ΄Π΅Π»Π°Π½Ρ ΠΌΠ°ΡΠ΅ΡΠΈΠ°Π»ΡΠ½ΡΠΉ, ΡΠ΅ΠΏΠ»ΠΎΠ²ΠΎΠΉ ΠΈ ΠΊΠΎΠ½ΡΡΡΡΠΊΡΠΈΠ²Π½ΡΠΉ ΡΠ°ΡΡΠ΅ΡΡ Π±Π°ΡΠ°Π±Π°Π½Π½ΠΎΠΉ ΠΏΠ΅ΡΠΈ ΠΎΡΠΆΠΈΠ³Π°. Π Π°ΡΡΠΌΠΎΡΡΠ΅Π½Ρ Π²ΠΎΠΏΡΠΎΡΡ Π±Π΅Π·ΠΎΠΏΠ°ΡΠ½ΠΎΡΡΠΈ ΠΆΠΈΠ·Π½Π΅Π΄Π΅ΡΡΠ΅Π»ΡΠ½ΠΎΡΡΠΈ. Π Π°ΡΡΠΌΠΎΡΡΠ΅Π½Π° ΡΠΊΠΎΠ»ΠΎΠ³ΠΈΡΠ΅ΡΠΊΠ°Ρ Π±Π΅Π·ΠΎΠΏΠ°ΡΠ½ΠΎΡΡΡ ΠΏΡΠΎΠΈΠ·Π²ΠΎΠ΄ΡΡΠ²Π°.In the given degree project the hardware-technological circuit of installation of reception of ferrite magnets is developed. In the state-of-the-art review the properties and ways of manufacturing of various magnets are considered: on a basis oxide of iron, bariy and chromobariy oxide ferromanganese, and also oxide ferromanganese on a basis Pb. For manufacturing ferrite magnets the method powder metal is chosen. The equipment of automatics for management and monitoring of technological process is picked up. The accounts of a mill are executed technological and durability, and also the material, thermal and constructive accounts of the drum-type furnace are made. The questions of protection of work and safety precautions are considered
Ionization and fragmentation of C-60 via multiphoton-multiplasmon excitation
We study the intensity dependence of ionization and fragmentation of buckminsterfullerene (C-60) in strong laser fields. Our data provide strong evidence that at intensities less than or similar to 10(14) W/cm(2) these processes occur predominantly via multiphoton excitation of the 20 eV plasmon resonance of C-60 At least two plasmons have to be created to initiate fragmentation or multiple ionization
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Changes in symptom burden and quality of life among women with uterine fibroids receiving relugolix combination therapy: A plain language summary
What is this summary about?: This is a summary of findings from two research studies (known as clinical trials). The studies looked at how well a medicine called relugolix combination therapy worked in women with heavy menstrual bleeding (heavy bleeding during a period) with uterine fibroids (noncancerous or benign growths in the uterus). In this analysis of the studies, researchers looked at how patients self-reported their uterine fibroid symptoms before and after taking relugolix combination therapy. Researchers also looked at how patients self-reported the impact of uterine fibroids on their health-related quality of life before and after taking relugolix combination therapy. What were the results?: Women took either relugolix combination therapy or placebo (a pill that contains no medicine) by mouth once daily for 24 weeks. Women completed the Uterine Fibroid Symptom and Quality of Life questionnaire (where "quality of life" refers to the women's health-related quality of life related to uterine fibroids) before, during, and after treatment. The questionnaire let researchers see if the women felt that relugolix combination therapy decreased the burden of uterine fibroid symptoms and improved the women's health-related quality of life related to uterine fibroids. More women said that they felt less distress due to their uterine fibroid symptoms and that their health-related quality of life related to uterine fibroids was better after taking relugolix combination therapy compared with women who took placebo. What do the results mean?: Relugolix combination therapy may lessen distress associated with uterine fibroid symptoms and improve health-related quality of life related to uterine fibroids.</p
Sub-wavelength terahertz beam profiling of a THz source via an all-optical knife-edge technique
Terahertz technologies recently emerged as outstanding candidates for a variety of applications in such sectors as security, biomedical, pharmaceutical, aero spatial, etc. Imaging the terahertz field, however, still remains a challenge, particularly when sub-wavelength resolutions are involved. Here we demonstrate an all-optical technique for the terahertz near-field imaging directly at the source plane. A thin layer (<100 nm-thickness) of photo carriers is induced on the surface of the terahertz generation crystal, which acts as an all-optical, virtual blade for terahertz near-field imaging via a knife-edge technique. Remarkably, and in spite of the fact that the proposed approach does not require any mechanical probe, such as tips or apertures, we are able to demonstrate the imaging of a terahertz source with deeply sub-wavelength features (<30 ΞΌm) directly in its emission plane
Formalism for Multiphoton Plasmon Excitation in Jellium Clusters
We present a new formalism for the description of multiphoton plasmon
excitation processes in jellium clusters. By using our method, we demonstrate
that, in addition to dipole plasmon excitations, the multipole plasmons
(quadrupole, octupole, etc) can be excited in a cluster by multiphoton
absorption processes, which results in a significant difference between plasmon
resonance profiles in the cross sections for multiphoton as compared to
single-photon absorption. We calculate the cross sections for multiphoton
absorption and analyse the balance between the surface and volume plasmon
contributions to multipole plasmons.Comment: 29 pages, 1 figur
C in intense femtosecond laser pulses: nonlinear dipole response and ionization
We study the interaction of strong femtosecond laser pulses with the C
molecule employing time-dependent density functional theory with the ionic
background treated in a jellium approximation. The laser intensities considered
are below the threshold of strong fragmentation but too high for perturbative
treatments such as linear response. The nonlinear response of the model to
excitations by short pulses of frequencies up to 45eV is presented and analyzed
with the help of Kohn-Sham orbital resolved dipole spectra. In femtosecond
laser pulses of 800nm wavelength ionization is found to occur multiphoton-like
rather than via excitation of a ``giant'' resonance.Comment: 14 pages, including 1 table, 5 figure
Calculations of the A_1 phonon frequency in photoexcited Tellurium
Calculations of the A_1 phonon frequency in photoexcited tellurium are
presented. The phonon frequency as a function of photoexcited carrier density
and phonon amplitude is determined. Recent pump probe experiments are
interpreted in the light of these calculatons. It is proposed that, in
conjunction with measurements of the phonon period in ultra-fast pump-probe
reflectivity experiments, the calculated frequency shifts can be used to infer
the evolution of the density of photoexcited carriers on a sub-picosecond
time-scale.Comment: 15 pages Latex, 3 postscript figure
Ultrafast changes in lattice symmetry probed by coherent phonons
The electronic and structural properties of a material are strongly
determined by its symmetry. Changing the symmetry via a photoinduced phase
transition offers new ways to manipulate material properties on ultrafast
timescales. However, in order to identify when and how fast these phase
transitions occur, methods that can probe the symmetry change in the time
domain are required. We show that a time-dependent change in the coherent
phonon spectrum can probe a change in symmetry of the lattice potential, thus
providing an all-optical probe of structural transitions. We examine the
photoinduced structural phase transition in VO2 and show that, above the phase
transition threshold, photoexcitation completely changes the lattice potential
on an ultrafast timescale. The loss of the equilibrium-phase phonon modes
occurs promptly, indicating a non-thermal pathway for the photoinduced phase
transition, where a strong perturbation to the lattice potential changes its
symmetry before ionic rearrangement has occurred.Comment: 14 pages 4 figure
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