226 research outputs found
NOVEL APPROACHES TO TREATING NONSPECIFIC LOW BACK PAIN
Objective: to evaluate the impact of therapy with chondroitin sulfate (CS) and glucosamine (GA) on the clinical manifestations of low back pain (LBP).Subjects and methods. A multicenter open-label observational prospective study was conducted in 22 cities of Russia (46 centers) to investigate the efficacy of a combination of CS and GA in the outpatient treatment of nonspecific LBP. A total of 9761 patients were enrolled in the study that was completed by 8546 patients. Therapeutic efficiency was evaluated from changes in pain intensity during movement and at rest, by using the visual analogue scale. The Oswestry disability index, an global physician and patient assessment of therapeutic efficiency, and a daily need for nonsteroidal anti-inflammatory drugs (NSAIDs) were taken into account as additional criteria for efficiency evaluation.Results and discussion. The multicenter open-label observational study established the efficacy of a combination of CS and GA in treating nonspecific LBP: relief in pain during movement and at rest, functional improvement, and a reduction in the daily need for NSAIDs. The patients and physicians highly assessed therapeutic efficiency. The combination of CS and GA was also noted to be well tolerated. The findings may suggest that this combination may be a promising tool to treat LBP and gives proof to the expediency of its use in randomized placebo-controlled studies
Band alignment and interlayer hybridisation in transition metal dichalcogenide/hexagonal boron nitride heterostructures
In van der Waals heterostructures, the relative alignment of bands between
layers, and the resulting band hybridisation, are key factors in determining a
range of electronic properties. This work examines these effects for
heterostructures of transition metal dichalcogenides (TMDs) and hexagonal boron
nitride (hBN), an ubiquitous combination given the role of hBN as an
encapsulating material. By comparing results of density functional calculations
with experimental angle-resolved photoemission spectroscopy (ARPES) results, we
explore the hybridisation between the valence states of the TMD and hBN layers,
and show that it introduces avoided crossings between the TMD and hBN bands,
with umklapp processes opening `ghost' avoided crossings in individual bands.
Comparison between DFT and ARPES spectra for the MoSe/hBN heterostructure
shows that the valence bands of MoSe and hBN are significantly further
separated in energy in experiment as compared to DFT. We then show that a novel
scissor operator can be applied to the hBN valence states in the DFT
calculations, to correct the band alignment and enable quantitative comparison
to ARPES, explaining avoided crossings and other features of band visibility in
the ARPES spectra
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Some Trends in Radioactive Waste Form Behavior Revealed in Long-Term Field Tests
Results from long-term field tests with borosilicate glass, cement and bitumen waste forms containing actual intermediate-level radioactive waste are summarized and discussed in the paper. Leaching behavior of the waste forms was evaluated by monitoring the contamination of contacting water. Measured leach rates of the three waste-form materials were in a narrow range in shallow subsurface repositories, but varied in a wide range at an open testing site owing to weathering of bitumen and cement materials. The repositories were opened after 12-year testing for visual examination, sampling and analysis. All retrieved waste forms were in good physical condition. The study has not revealed any negative changes in the waste glass. Some ageing processes were detected in cement and bitumen waste forms, which can positively (bitumen) or negatively (cement) affect physical and containment properties of these waste materials. It has been established that a significant proportion of the radioactive inventory in the bitumen waste form became associated with the bitumen phase. Phase separation of this radioactive bitumen has shown, than the asphaltene fraction is responsible for the major part of the radioactivity retained by the bitumen
Ti2NiCu Based Composite Nanotweezers with a Shape Memory Effect and its Use for DNA Bunches 3D Manipulation
The DNA molecules were controllable deposited on graphene and thin graphite
films and visualized using AFM. The mechanical micro- and nanotools, such as
nanotweezers with shape memory effect controlled by heating were designed and
tested. A technique for fabricating a structure with the inclusion of suspended
DNA threads and manipulating those using composite nanotweezers with shape
memory effect was suggested.Comment: arXiv admin note: text overlap with arXiv:1811.0294
IMMUNOLOGIC MARKER OF INTRANATAL INFECTIONS
The results of the research established determination of immunologic marker for prognosis of intranatal infection. The authors performed a comparative study of the immunity values of women in a risk group for prenatal infection. As it was shown when prenatal infection develops, there is an increase in the content of proinflammatory cytokines in the pregnant woman serum and activation of the ingestion rate. Account the results to devise an algorithm the pregnant woman care
Π ΡΠ°ΡΠΏΡΠ΅Π΄Π΅Π»Π΅Π½ΠΈΠΈ ΡΠ΅Π½ Π½Π° ΡΡΠ½ΠΊΠ°Ρ Π½Π΅Π΄Π²ΠΈΠΆΠΈΠΌΠΎΡΡΠΈ ΠΈ Β«ΡΠΌΠ΅ΡΠ΅Π½Π½ΡΡ Β» ΠΎΡΠ΅Π½ΠΊΠ°Ρ ΡΡΠ½ΠΎΡΠ½ΠΎΠΉ ΡΡΠΎΠΈΠΌΠΎΡΡΠΈ
The published results of stochastic modeling and experimental studiesΒ on the distribution of prices of real estate markets, accompanied by theΒ conclusions of a systematic overestimation of the market value of theΒ consultants-valuers are stated in the article. Displaying the fundamentalΒ difference between the distributions of prices on different objects observedΒ in the real estate market and the distribution of possible prices for theΒ estimated object. The conclusion about the absence of grounds for theΒ allegations of a systematic overestimation of the market value as a resultΒ of these differences is fixed. Formation unbiased valuations based on theΒ properties of the distribution Β of the adjusted average prices of the sample analogs are also explained.Π ΡΡΠ°ΡΡΠ΅ ΠΎΠ±ΡΡΠΆΠ΄Π°ΡΡΡΡ ΠΎΠΏΡΠ±Π»ΠΈΠΊΠΎΠ²Π°Π½Π½ΡΠ΅ ΡΠ°Π½Π΅Π΅ ΡΠ΅Π·ΡΠ»ΡΡΠ°ΡΡ ΡΡΠΎΡ
Π°ΡΡΠΈΡΠ΅ΡΠΊΠΎΠ³ΠΎ ΠΌΠΎΠ΄Π΅Π»ΠΈΡΠΎΠ²Π°Π½ΠΈΡ ΠΈ ΡΠΊΡΠΏΠ΅ΡΠΈΠΌΠ΅Π½ΡΠ°Π»ΡΠ½ΡΡ
ΠΈΡΡΠ»Π΅Π΄ΠΎΠ²Π°Π½ΠΈΠΉΒ ΡΠ°ΡΠΏΡΠ΅Π΄Π΅Π»Π΅Π½ΠΈΡ ΡΠ΅Π½ Π½Π° ΡΠ΅Π°Π»ΡΠ½ΡΡ
ΡΡΠ½ΠΊΠ°Ρ
Π½Π΅Π΄Π²ΠΈΠΆΠΈΠΌΠΎΡΡΠΈ, ΡΠΎΠΏΡΠΎΠ²ΠΎΠΆΠ΄Π°ΡΡΠΈΠ΅ΡΡ Π·Π°ΠΊΠ»ΡΡΠ΅Π½ΠΈΡΠΌΠΈ ΠΎ ΡΠΈΡΡΠ΅ΠΌΠ°ΡΠΈΡΠ΅ΡΠΊΠΎΠΌ Π·Π°Π²ΡΡΠ΅Π½ΠΈΠΈ ΡΡΠ½ΠΎΡΠ½ΠΎΠΉΒ ΡΡΠΎΠΈΠΌΠΎΡΡΠΈ ΠΊΠΎΠ½ΡΡΠ»ΡΡΠ°Π½ΡΠ°ΠΌΠΈ-ΠΎΡΠ΅Π½ΡΠΈΠΊΠ°ΠΌΠΈ. ΠΠΎΠΊΠ°Π·Π°Π½ΠΎ ΠΏΡΠΈΠ½ΡΠΈΠΏΠΈΠ°Π»ΡΠ½ΠΎΠ΅ ΠΎΡΠ»ΠΈΡΠΈΠ΅ ΡΠ°ΡΠΏΡΠ΅Π΄Π΅Π»Π΅Π½ΠΈΡ ΡΠ΅Π½ Π½Π° ΡΠ°Π·Π½ΡΠ΅ ΠΎΠ±ΡΠ΅ΠΊΡΡ, Π½Π°Π±Π»ΡΠ΄Π°Π΅ΠΌΡΠ΅ Π½Π°Β ΡΡΠ½ΠΊΠ΅ Π½Π΅Π΄Π²ΠΈΠΆΠΈΠΌΠΎΡΡΠΈ, ΠΎΡ ΡΠ°ΡΠΏΡΠ΅Π΄Π΅Π»Π΅Π½ΠΈΡ Π²ΠΎΠ·ΠΌΠΎΠΆΠ½ΡΡ
ΡΠ΅Π½ Π½Π° ΠΎΠ΄ΠΈΠ½ βΠΎΡΠ΅Π½ΠΈΠ²Π°Π΅ΠΌΡΠΉ ΠΎΠ±ΡΠ΅ΠΊΡ. Π€ΠΈΠΊΡΠΈΡΡΠ΅ΡΡΡ ΠΎΡΡΡΡΡΡΠ²ΠΈΠ΅ ΠΎΡΠ½ΠΎΠ²Π°Π½ΠΈΠΉ Π΄Π»Ρ ΡΡΠ²Π΅ΡΠΆΠ΄Π΅Π½ΠΈΡ ΠΎ ΡΠΈΡΡΠ΅ΠΌΠ°ΡΠΈΡΠ΅ΡΠΊΠΎΠΌ Π·Π°Π²ΡΡΠ΅Π½ΠΈΠΈ ΠΎΡΠ΅Π½ΠΎΠΊ ΡΡΠ½ΠΎΡΠ½ΠΎΠΉ ΡΡΠΎΠΈΠΌΠΎΡΡΠΈ Π²ΡΠ»Π΅Π΄ΡΡΠ²ΠΈΠ΅ ΡΡΠΈΡ
ΡΠ°Π·Π»ΠΈΡΠΈΠΉ. Π’Π°ΠΊΠΆΠ΅ ΠΎΠ±ΡΡΡΠ½Π΅Π½ΠΎ ΡΠΎΡΠΌΠΈΡΠΎΠ²Π°Π½ΠΈΠ΅Β Π½Π΅ΡΠΌΠ΅ΡΠ΅Π½Π½ΡΡ
ΠΎΡΠ΅Π½ΠΎΠΊ ΡΡΠΎΠΈΠΌΠΎΡΡΠΈ Π½Π° ΠΎΡΠ½ΠΎΠ²Π΅ ΡΠ²ΠΎΠΉΡΡΠ² ΡΠ°ΡΠΏΡΠ΅Π΄Π΅Π»Π΅Π½ΠΈΡΒ ΡΡΠ΅Π΄Π½Π΅ΠΉ ΡΠΊΠΎΡΡΠ΅ΠΊΡΠΈΡΠΎΠ²Π°Π½Π½ΠΎΠΉ ΡΠ΅Π½Ρ ΠΏΠΎ Π²ΡΠ±ΠΎΡΠΊΠ΅ Π°Π½Π°Π»ΠΎΠ³ΠΎΠ²
Strongly localized polaritons in an array of trapped two-level atoms interacting with a light field
We propose a new type of spatially periodic structure, i.e. polaritonic
crystal (PolC), to observe a "slow"/"stopped" light phenomenon due to coupled
atom-field states (polaritons) in a lattice. Under the tightbinding
approximation, such a system realizes an array of weakly coupled trapped
two-component atomic ensembles interacting with optical field in a
tunnel-coupled one dimensional cavity array. We have shown that the phase
transition to the superfluid Bardeen-Cooper-Schrieffer state, a so-called
(BCS)-type state of low branch polaritons, occurs under the strong coupling
condition. Such a transition results in the appearance of a macroscopic
polarization of the atomic medium at non-zero frequency. The principal result
is that the group velocity of polaritons depends essentially on the order
parameter of the system, i.e. on the average photon number in the cavity array.Comment: 16 pages, 6 figure
ΠΡΠΈΠΌΠ΅Π½Π΅Π½ΠΈΠ΅ ΠΊΠΎΡΡΠ΅Π»ΡΡΠΈΠΎΠ½Π½ΠΎΠ³ΠΎ ΠΌΠ΅ΡΠΎΠ΄Π° ΠΎΠΏΡΠ΅Π΄Π΅Π»Π΅Π½ΠΈΡ ΡΠΊΠΎΡΠΎΡΡΠΈ ΠΏΠΎΡΠΎΠΊΠ° ΡΠ΅ΠΏΠ»ΠΎΠ½ΠΎΡΠΈΡΠ΅Π»Ρ ΠΏΡΠΈ ΠΈΡΡΠ»Π΅Π΄ΠΎΠ²Π°Π½ΠΈΡΡ Π³ΠΈΠ΄ΡΠΎΠ΄ΠΈΠ½Π°ΠΌΠΈΠΊΠΈ ΡΡΡΠ±ΡΠ»Π΅Π½ΡΠ½ΡΡ ΠΏΠΎΡΠΎΠΊΠΎΠ² Π² ΡΠ»Π΅ΠΌΠ΅Π½ΡΠ°Ρ ΡΠ΄Π΅ΡΠ½ΡΡ ΡΠ΅Π°ΠΊΡΠΎΡΠΎΠ²
The method of correlation measurement of the coolant flow rate, widely used for operational diagnostics of nuclear power plants, can be extensively used in research practice. The aim of this work was to apply a correlation method based on the conductometric measurement system with wire-mesh sensors for measuring a coolant flow rate. Insignificant concentration of a salt solution (NaCl or Na2SO4 ) creates a gradient of the conductivity in the flow, which is used as a passive scalar measured by the system. Authors used turbulent pulsations at the interface of two concurrent flows with identical velocities in a square channel as a signal source for the correlation method. The paper presents the methodology of the tests, test facility description, signalto- noise ratio estimation, the results of digital signal processing and comparison of the measured velocities in the model with the flowrateβaveraged velocity determined by the use of flowmeters. The measured velocity values give acceptable agreement for the turbulent flow modes. It was shown that the measurement accuracy drops sharply for low-Reynolds flows. The obtained results were used for flowrate measurements in core-imitator channels of the nuclear reactor test model. The presented paper is an approbation of this approach for its application as part of an test model of a nuclear reactor in order to determine the each duct flow rates in the channels of the core simulator using wire mesh sensors
Anomalous exponents in the rapid-change model of the passive scalar advection in the order
Field theoretic renormalization group is applied to the Kraichnan model of a
passive scalar advected by the Gaussian velocity field with the covariance
. Inertial-range
anomalous exponents, related to the scaling dimensions of tensor composite
operators built of the scalar gradients, are calculated to the order
of the expansion. The nature and the convergence of
the expansion in the models of turbulence is are briefly discussed.Comment: 4 pages; REVTeX source with 3 postscript figure
Thermal effects of carbonated hydroxyapatite modified by glycine and albumin
In this work calcium phosphate powders were obtained by precipitation method from simulated solutions of synovial fluid containing glycine and albumin. X-ray diffraction and IR spectroscopy determined that all samples are single-phase and are presented by carbonate containing hydroxyapatite (CHA). The thermograms of solid phases of CHA were obtained and analyzed; five stages of transformation in the temperature range of 25-1000Β°C were marked. It is shown that in this temperature range dehydration, decarboxylation and thermal degradation of amino acid and protein connected to the surface of solid phase occur. The tendency of temperature lowering of the decomposition of powders synthesized from a medium containing organic substances was determined. Results demonstrate a direct dependence between the concentration of the amino acid in a model solution and its content in the solid phase
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