Abstract
The vibration of bearings No. 60,206 with radial clearance of 0…0.45 mm is investigated. Analysis of the frequency response (FR) of vibration acceleration reveals information frequencies of ...6 Hz, 15 Hz, 26 Hz, and 46 Hz, which coincide with the calculated values. The dependence of the vibration acceleration amplitude on the radial clearance for the specified frequencies is determined. The possibility of rolling bearing wear estimation by vibroacoustic diagnostic methods using artificial neural networks is proved. Diagnostic accuracy with the 4:4-3:1 MI network ranges from 75.6% for a radial clearance of 0.15 mm to 100% for a clearance of 0 mm.
A
bstract
We present the study of the decay
J/ψ
→
ρπ
. The results are based on of 5.2 million
J/ψ
events collected by the KEDR detector at the VEPP-4M collider. The branching fractions are measured ...to be
B
(
J/ψ
→
ρπ
) = (2
.
072 ± 0
.
017 ± 0
.
062) ∙ 10
−
2
and
B
(
J/ψ
→
π
+
π
−
π
0
) = (1
.
878 ± 0
.
013 ± 0
.
051) ∙ 10
−
2
, where the first uncertainties are statistical and the second systematic. Our results are more precise than the previous relative measurements.
New precise unpolarised differential cross sections of deuteron–proton elastic scattering have been measured at 16 different deuteron beam momenta between pd=3120.17MeV/c and pd=3204.16MeV/c at the ...COoler SYnchrotron COSY of the Forschungszentrum Jülich. The data, which were taken using the magnetic spectrometer ANKE, cover the equivalent range in proton kinetic energies from Tp=882.2MeV to Tp=918.3MeV. The experimental results are analysed theoretically using the Glauber diffraction model with accurate nucleon–nucleon input. The theoretical cross section at Tp=900MeV agrees very well with the experimental one at low momentum transfers t. There are, however, significant deviations for |t|>0.2(GeV/c)2 that must be investigated further.
Tryptophan hydroxylases 1 and 2 (TPH1 and TPH2) play a key role in the synthesis of serotonin (5-HT), a hormone and neurotransmitter, in the peripheral organs and brain, respectively. The main aim of ...this study was to clarify the distribution of mRNA of the Tph1 and Tph2 genes in brain structures under normal conditions and after inflammation. The experiments were carried out on young (4 weeks old) male C57BL/6 mice. The animals were divided into three groups: intact, control, injected ip with saline, and injected ip with 2 mg/kg of bacterial lipopolysaccharide (LPS). Markers of inflammation, spleen mass and thymus mass were assayed 5 days after the saline or LPS administration. In the frontal cortex, hippocampus, striatum, hypothalamus, and midbrain the concentrations of 5-HT and its main metabolite, 5-hydroxyindole acetic acid (5-HIAA), and TPH activity were assayed using HPLC, while Tph1 and Tph2 mRNA were quantified using quantitative real-time RT-PCR. A dramatic increase of spleen mass and decrease of thymus mass 5 days after LPS administration was shown. A significant increase of 5-HT and 5-HIAA levels in the midbrain as well as decrease of 5-HIAA concentration and TPH activity in hypothalamus in mice treated with LPS and saline compared with intact animals was revealed. The highest concentration of Tph2 gene mRNA was observed in the midbrain in 5-HT neuron bodies, while this gene mRNA level was lower in 5-HT endings (cortex, hippocampus, striatum, and hypothalamus). Trace amounts of Tph1 mRNA was found in all studied brain structures in mice of the three groups. Thus, Tph1 gene expression in the mouse brain is too low to significantly affect 5-HT synthesis in normal conditions and during inflammation.
The influence of the thermophysical characteristics of biochars obtained by hydrothermal carbonization of peat on the yield and composition of producer gas in the course of its steam–air gasification ...was studied. It was established that an increase in the temperature of hydrothermal treatment of peat facilitated not only an increase in the yield of gas but also an increase in its qualitative characteristics, namely, calorific values. Long-term processing of peat raw materials (50 h) during hydrothermal carbonization led to too deep deoxygenation of the raw materials and adversely affected the quality of the resulting producer gas.
Tidal oscillations in the Caspian Sea Medvedev, I. P.; Kulikov, E. A.; Rabinovich, A. B.
Oceanology (Washington. 1965),
05/2017, Letnik:
57, Številka:
3
Journal Article
Recenzirano
Long-term hourly data from 12 tide gauge stations were used to examine the character of tidal oscillations in the Caspian Sea. Diurnal and semidiurnal tidal peaks are well-defined in sea level ...spectra in the Middle and South Caspian basins. High-resolution spectral analysis revealed that the diurnal sea level oscillations in the Middle Caspian Basin have a gravitational origin, while those in the South Caspian Basin are mainly caused by radiational effects: the amplitude of diurnal radiational harmonic S
1
is much higher than those of gravitational harmonics О
1
, P
1
, and K
1
. In the North Caspian Basin, there are no gravitational tides and only weak radiational tides are observed. A semidiurnal type of tide is predominant in the Middle and South Caspian basins. Harmonic analysis of the tides for individual annual series with subsequent vector averaging over the entire observational period was applied to estimate the mean amplitudes and phases of major tidal constituents. The amplitude of the M
2
harmonic reaches 5.4 cm in the South Caspian Basin (at Aladga). A maximum tidal range of 21 cm was found at the Aladga station in the southeastern part of the Caspian Sea, whereas the tidal range in the western part of the South Caspian Basin varies from 5 to 10 cm.
Sea level changes with a period of 14 months (P14) are usually associated with the pole tide, which is the oceanic response to the Chandler wobble in the Earth's axis of rotation. The amplitudes of ...these changes in the Baltic Sea are anomalously large, much larger than follows from the equilibrium pole tide theory. It appears that the oscillations are related to meteorological forcing rather than to pole motions. To examine the P14 properties, we used long-term (48–213 years) tide gauge records from 77 stations located in the Baltic Sea and adjacent area of the North Sea. High-resolution sea level spectra revealed a cluster of peaks with periods from 410 to 450 days. The temporal variations in the P14 sea level amplitudes and peak frequencies are found to be considerable and poorly correlated with the modulation of the Earth's pole motions. In contrast, our findings for 1871–2011 demonstrate strong resemblance between temporal (year-to-year) variations of the P14 peak and zonal wind, confirming earlier results of Ekman (1996) and O’Connor et al. (2000), who indicated the major role of the zonal wind in formation of the 14-month oscillations in the Baltic and North seas. The integral amplitudes of the P14 oscillations in the Baltic Sea gradually increase eastward from the entrance (the Danish straits) to the farthest ends of the sea with the largest amplitudes (up to 6.5cm) observed at the very head of the Gulf of Finland. Similar P14 amplification toward the west coast of Denmark is also observed along the south coast of the North Sea. The geographical distribution of the P14 in these two regions are almost the same as of the seasonal sea level oscillations, indicating presumably similar formation mechanisms. Extensive shallow-water areas in the Baltic Sea and southeastern part of the North Sea, combined with intense meteorological forcing, appear to be two key factors responsible for the formation of anomalously strong 14-month oscillations in these regions.
Display omitted
•Detailed analysis of 40 to 213-year records from 77 tide gauges in the Baltic Sea.•Detailed mapping of pole tide (P14) in the Baltic Sea.•Identification of the World maximum P14 amplitudes (6.5cm) in the Gulf of Finland.•Evidence for strong covariation in interannual P14 sea level and zonal winds.•Weak correlation between P14 sea level changes and Earth's pole motions.
The history of influenza pandemics of the 20th century and the 2009 pandemic is analyzed, as well as the stages of parallel development of the influenza doctrine. Hypotheses and theoretical aspects ...explaining the mechanisms of formation of seasonal epidemics and pandemics are considered. Zooanthroponosis locates the Genesis of pandemic influenza type A and type anthropogenic the essence of seasonal drift epidemics of influenza of all types. Taking into account the diversity of opinions of experts, it is proposed to return to the discussion of controversial epidemiological and virological issues officially recognized by WHO in 2009 of the pandemic to develop a unified concept of pandemic influenza on the basis of multi-level variability of the pathogens. We discuss the possibility of improving the prediction of epidemiological (epizoonotic) influenza situation by complex monitoring of the predictors of pandemics (epidemics, epizoonotics) in the hog production regions laboratories, epidemiological and veterinary profile. It is assumed that the probable causative agent of the next pandemic will be influenza virus of serasubtype A (Н2N2).
The differential cross sections for the yields of nuclear fragments at an angle of 3.5◦ in the fragmentation of carbon nuclei with energy 0.95 GeV per nucleon on a beryllium target were measured in ...the FRAGM experiment at the ITEP TWA heavy-ion accelerator. The momentum spectra of fragments were used to test the following four models of ion–ion interactions: BC, INCL++, LAQGSM03.03, and QMD. For light fragments, the slope parameters of the kinetic-energy spectra were obtained in the cumulative region.
The existence of a light dark force mediator has been tested with the KLOE detector at DA Phi NE. This particle, called U. is searched for using the decay chain phi -> eta U, eta -> ...pi(+)pi(-)pi(0), U -> e(+)e(-). No evidence is found in 1.5 fb(-1) of data. The resulting exclusion plot covers the mass range 5 < M-U < 470 MeV, setting an upper limit on the ratio between the U boson coupling constant and the One structure constant, alpha'/alpha, of <= 2 x 10(-5) at 90% C.L. for 50 < M-U < 420 MeV.
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