Publications by authors named "V G Mitrofanov"
A 62 Hz high-Q 4-spiral mechanical resonator fabricated of a silicon wafer.
Rev Sci Instrum
December 2024
High purity silicon is considered as the test mass material for future cryogenic gravitational-wave detectors, in particular Einstein Telescope-low frequency and LIGO Voyager [(LIGO) Laser Interferometer Gravitational-Wave Observatory]. To reduce the thermal noise of the test masses, it is necessary to study the sources of corresponding losses. Mechanical resonators with frequencies 300 Hz-6 kHz are successfully used for studying, for example, losses in optical coatings of the test mass.
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- The study investigates compact binary coalescences with at least one component mass between 0.2 and 1.0 solar masses using data from Advanced LIGO and Advanced Virgo detectors over six months in 2019, but they found no significant gravitational wave candidates.
- The analysis leads to an upper limit on the merger rate of subsolar binaries ranging from 220 to 24,200 Gpc⁻³ yr⁻¹, based on the detected signals’ false alarm rate.
- The researchers use these limits to set new constraints on two models for subsolar-mass compact objects: primordial black holes (suggesting they make up less than 6% of dark matter) and
Objective: The aim of this non-inferiority randomised trial was to compare the short and midterm safety and efficacy of hybrid repair (HR) and open reconstruction (OR) for patients with co-existing iliac and common femoral artery (CFA) occlusive disease.
Methods: The study was registered on the ClinicalTrials.gov register (identifier: NCT02580084).
Several projects of the next generation gravitational-wave detectors use the high purity monocrystalline silicon test masses. The electric field of the actuator that is applied to correct the position of the silicon test mass causes additional mechanical losses and associated noise. Disk mechanical resonators are widely used to study mechanical losses in multilayer optical coatings that are deposited on the test masses of gravitational-wave detectors.
View Article and Find Full Text PDFUnlabelled: was to develop a technology for repairing an osteomyelitic bone defect using autologous adipose tissue mesenchymal stromal cells (MSCs) bound to a collagen matrix and to test the efficacy of this technique.
Materials And Methods: The study was carried out with 17 rabbits. A bone defect was created using a milling cutter applied to the proximal third of the leg.