571 research outputs found
ΠΡΠ΅ΠΊΠ»ΠΈΠ½ΠΈΡΠ΅ΡΠΊΠΈΠΉ Π°ΡΠ΅ΡΠΎΡΠΊΠ»Π΅ΡΠΎΠ·: ΡΠ½Π΄ΠΎΡΠ΅Π»ΠΈΠ°Π»ΡΠ½Π°Ρ Π΄ΠΈΡΡΡΠ½ΠΊΡΠΈΡ, ΠΊΠΎΠΌΠΏΠ»Π΅ΠΊΡ ΠΈΠ½ΡΠΈΠΌΠ°-ΠΌΠ΅Π΄ΠΈΠ°, ΡΠΎΡΡΠ΄ΠΈΡΡΠ°Ρ ΠΆΠ΅ΡΡΠΊΠΎΡΡΡ
Preclinical atherosclerosis is an acute problem of contemporary medicine with significant effects on cardiovascular morbidity and mortality. Targeting strategy to tackle atherosclerotic disease at incipient clinical stages is undertaken to achieve a significant reduction in major cardiovascular events and reliance on an early assessment of serum markers of endothelial dysfunction and other noninvasive indicators of asymptomatic atherosclerotic arterial disease, such as the intimae-media thickness and arterial stiffness.ΠΡΠ΅ΠΊΠ»ΠΈΠ½ΠΈΡΠ΅ΡΠΊΠΈΠΉ Π°ΡΠ΅ΡΠΎΡΠΊΠ»Π΅ΡΠΎΠ· ΡΠ²Π»ΡΠ΅ΡΡΡ ΠΎΡΡΡΠΎΠΉ ΠΏΡΠΎΠ±Π»Π΅ΠΌΠΎΠΉ ΡΠΎΠ²ΡΠ΅ΠΌΠ΅Π½Π½ΠΎΠΉ ΠΌΠ΅Π΄ΠΈΡΠΈΠ½Ρ ΠΈ ΠΎΠ±Π»Π°Π΄Π°Π΅Ρ Π·Π½Π°ΡΠΈΡΠ΅Π»ΡΠ½ΡΠΌ Π²Π»ΠΈΡΠ½ΠΈΠ΅ΠΌ Π½Π° ΡΠ΅ΡΠ΄Π΅ΡΠ½ΠΎ- ΡΠΎΡΡΠ΄ΠΈΡΡΡΡ Π·Π°Π±ΠΎΠ»Π΅Π²Π°Π΅ΠΌΠΎΡΡΡ ΠΈ ΡΠΌΠ΅ΡΡΠ½ΠΎΡΡΡ. ΠΡΠΈΠ΅Π½ΡΠ°ΡΠΈΡ ΡΡΡΠ°ΡΠ΅Π³ΠΈΠΈ Π±ΠΎΡΡΠ±Ρ Ρ Π°ΡΠ΅ΡΠΎΡΠΊΠ»Π΅ΡΠΎΡΠΈΡΠ΅ΡΠΊΠΎΠΉ Π±ΠΎΠ»Π΅Π·Π½ΡΡ Π½Π° ΠΏΡΠ΅ΠΊΠ»ΠΈΠ½ΠΈΡΠ΅ΡΠΊΠΈΡ
ΡΡΠ°Π΄ΠΈΡΡ
Π½Π°ΡΠ΅Π»Π΅Π½Π° Π½Π° Π΄ΠΎΡΡΠΈΠΆΠ΅Π½ΠΈΠ΅ Π·Π½Π°ΡΠΈΡΠ΅Π»ΡΠ½ΠΎΠ³ΠΎ ΡΠ½ΠΈΠΆΠ΅Π½ΠΈΡ ΠΎΡΠ½ΠΎΠ²Π½ΡΡ
ΡΠ΅ΡΠ΄Π΅ΡΠ½ΠΎ-ΡΠΎΡΡΠ΄ΠΈΡΡΡΡ
ΠΎΡΠ»ΠΎΠΆΠ½Π΅Π½ΠΈΠΉ ΠΈ ΠΎΡΠ½ΠΎΠ²Π°Π½Π° Π½Π° ΡΠ°Π½Π½Π΅ΠΉ ΠΎΡΠ΅Π½ΠΊΠ΅ ΡΡΠ²ΠΎΡΠΎΡΠΎΡΠ½ΡΡ
ΠΌΠ°ΡΠΊΠ΅ΡΠΎΠ² ΡΠ½Π΄ΠΎΡΠ΅Π»ΠΈΠ°Π»ΡΠ½ΠΎΠΉ Π΄ΠΈΡΡΡΠ½ΠΊΡΠΈΠΈ ΠΈ Π½Π° Π΄ΡΡΠ³ΠΈΡ
Π½Π΅ΠΈΠ½Π²Π°Π·ΠΈΠ²Π½ΡΡ
ΠΏΠΎΠΊΠ°Π·Π°ΡΠ΅Π»ΡΡ
Π±Π΅ΡΡΠΈΠΌΠΏΡΠΎΠΌΠ½ΠΎΠ³ΠΎ Π°ΡΠ΅ΡΠΎΡΠΊΠ»Π΅ΡΠΎΡΠΈΡΠ΅ΡΠΊΠΎΠ³ΠΎ ΠΏΠΎΡΠ°ΠΆΠ΅Π½ΠΈΡ Π°ΡΡΠ΅ΡΠΈΠΉ, ΡΠ°ΠΊΠΈΡ
ΠΊΠ°ΠΊ ΡΠΎΠ»ΡΠΈΠ½Π° ΠΊΠΎΠΌΠΏΠ»Π΅ΠΊΡΠ° ΠΈΠ½ΡΠΈΠΌΠ°-ΠΌΠ΅Π΄ΠΈΠ° ΠΈ ΠΆΠ΅ΡΡΠΊΠΎΡΡΡ ΡΠΎΡΡΠ΄ΠΈΡΡΡΡ
ΡΡΠ΅Π½ΠΎΠΊ
Many-Body Superconformal Systems from Hamiltonian Reductions
We propose a new reduction mechanism which allows one to construct n-particle
(super)conformal theories with pairwise interaction starting from a composite
system involving n(n-1)/2+1 copies of the ordinary (super)conformal mechanics.
Applications of the scheme include an N=4 superconformal extension for a
complexification of the Calogero model and a D(2,1|\alpha)-invariant n-particle
system.Comment: 12 pages, no figures. v2: Title changed. New material and
acknowledgements adde
Wiring surface loss of a superconducting transmon qubit
Quantum processors using superconducting qubits suffer from dielectric loss
leading to noise and dissipation. Qubits are usually designed as large
capacitor pads connected to a non-linear Josephson junction (or SQUID) by a
superconducting thin metal wiring. Here, we report on finite-element simulation
and experimental results confirming that more than 50% of surface loss in
transmon qubits can originated from Josephson junctions wiring and can limit
qubit relaxation time. Extracting dielectric loss tangents capacitor pads and
wiring based on their participation ratios, we show dominant surface loss of
wiring can occur for real qubits designs. Then, we simulate a qubit coupled to
a bath of individual TLS defects and show that only a small fraction (~18%) of
coupled defects is located within the wiring interfaces, however, their
coupling strength is much higher due to stronger electromagnetic field.
Finally, we fabricate six tunable floating transmon qubits and experimentally
demonstrate up to 20% improvement in qubit quality factor by wiring design
optimization.Comment: 17 pages, 8 figure
Octahedral chalcogenide rhenium cluster complexes with imidazole
Reactions of [{Re6Q8}Br6]4β/3β (Qβ―=β―S, Se) with molten imidazole lead to the formation of two new neutral cluster complexes [{Re6Q8}(imzH)4(imz)2] (imzHβ―=β―imidazole). The interaction of [{Re6Q8}(imzH)4(imz)2] with hydrohalic acids resulted in cationic complexes [{Re6Q8}(imzH)6]X2 (Xβ―=β―Cl, Br). All compounds were characterised by X-ray single-crystal and powder diffraction analyses, elemental analysis, energy dispersive X-ray and IR spectroscopies. The luminescence of the neutral compounds [{Re6Q8}(imzH)4(imz)2] was also studied
Robust cryogenic matched low-pass coaxial filters for quantum computing applications
Electromagnetic noise is one of the key external factors decreasing
superconducting qubits coherence. Matched coaxial filters can prevent microwave
and IR photons negative influence on superconducting quantum circuits. Here, we
report on design and fabrication route of matched low-pass coaxial filters for
noise-sensitive measurements at milliKelvin temperatures. A robust transmission
coefficient with designed linear absorption (-1dB/GHz) and ultralow reflection
losses less than -20 dB up to 20 GHz is achieved. We present a mathematical
model for evaluating and predicting filters transmission parameters depending
on their dimensions. It is experimentally approved on two filters prototypes
different lengths with compound of Cu powder and Stycast commercial resin
demonstrating excellent matching. The presented design and assembly route are
universal for various compounds and provide high repeatability of geometrical
and microwave characteristics. Finally, we demonstrate three filters with
almost equal reflection and transmission characteristics in the range from 0 to
20 GHz, which is quite useful to control multiple channel superconducting
quantum circuits.Comment: 5 pages, 4 figure
An X-ray photoelectron spectroscopy study of uranyl-chitosan interaction
An X-ray photoelectron spectroscopy study of uranium sorption by spherically-granulated chitosan in sulphate solutions, as well as the study of the nature of the U(VI) - chitosan interaction was carried out in this work. The X-ray photoelectron spectroscopy analysis showed that the uranyl - chitosan interaction results in the formation of complexes with aminogroup nitrogen, and possibly chitin ring oxygens and free hydroxyl groups in the equatorial plane. Under the UHV in the spectrometer chamber, the uranyl-amin and uranyl-hyroxide bonds were shown to break and tetravalent uranium compounds were shown to form on the sample surface. Hydroxyl groups were shown to evaporate. The calculated DG0 = -1,3 kJ/mol can be an evidence of several concurrent processes, some of which require energy, as well as of the formation of a surface chemical compound
Signatures of High-Intensity Compton Scattering
We review known and discuss new signatures of high-intensity Compton
scattering assuming a scenario where a high-power laser is brought into
collision with an electron beam. At high intensities one expects to see a
substantial red-shift of the usual kinematic Compton edge of the photon
spectrum caused by the large, intensity dependent, effective mass of the
electrons within the laser beam. Emission rates acquire their global maximum at
this edge while neighbouring smaller peaks signal higher harmonics. In
addition, we find that the notion of the centre-of-mass frame for a given
harmonic becomes intensity dependent. Tuning the intensity then effectively
amounts to changing the frame of reference, going continuously from inverse to
ordinary Compton scattering with the centre-of-mass kinematics defining the
transition point between the two.Comment: 25 pages, 16 .eps figure
Counting Statistics of an Adiabatic Pump
We consider quantum statistics of charge transmitted through a mesoscopic
device in the adiabatic pumping process. A general formula for the distribution
function of the transmitted charge in terms of the time-dependent S-matrix is
obtained. It is applied to a few simple examples of the pumping cycles. We
identify coherent pumping strategies which lead to the binomial charge
distribution and minimize the fluctuations of the pumped current. Conditions
for the ideal noiseless quantized pump are discussed.Comment: 4 page
An X-ray photoelectron spectroscopy study of the products of the interaction of gaseous IrF6 with fine UO2F2
Nuclear fuel reprocessing by fluorination, a dry method of regeneration of spent nuclear fuel, uses UO2F2 for the separation of plutonium from gaseous mixtures. Since plutonium requires special treatment, IrF6 was used as a thermodynamic model of PuF6. The model reaction of the interaction of gaseous IrF6 with fine UO2F2 in the sorption column revealed a change of color of the sorption column contents from pale-yellow to gray and black, indicating the formation of products of such an interaction. The X-ray photoelectron spectroscopy study showed that the interaction of gaseous IrF6 with fine UO2F2 at 125 Β°C results in the formation of stable iridium compounds where the iridium oxidation state is close to Ir3+. The dependence of the elemental compositions of the layers in the sorption column on the penetration depth of IrF6 was established
Conformal mechanics inspired by extremal black holes in d=4
A canonical transformation which relates the model of a massive relativistic
particle moving near the horizon of an extremal black hole in four dimensions
and the conventional conformal mechanics is constructed in two different ways.
The first approach makes use of the action-angle variables in the angular
sector. The second scheme relies upon integrability of the system in the sense
of Liouville.Comment: V2: presentation improved, new material and references added; the
version to appear in JHE
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