100 research outputs found
Developing of modern cultivation technology of organic potatoes
Medium term field experiment demonstrates the effectiveness of biological ways to
increase potatoes yield on the sod-podzolic, light loamy soil.
The effects of the following two groups of factors were studied:
1. The level of mineral nutrition provided by compost;
2. Microbiological pant protection product (bio preparations): Flavobacterin which has
N fixer attribute and Vitaplan and Kartofen, which have bio fungicide features.
Potatoes varieties ‘Nevsky’ and ‘Udacha’ were cultivated. The compost was applied in the dose
range from 0 to 160 kg N ha-1
. Treatment with bio-preparations was carried out by potato tubers
during planting and leaves during the growing season. Weeds were removed mechanically.
Weather conditions had a significant impact on the formation of the crop. The average yield of
standard potato tubers for 2017–2018 ranged from 14.1 to 29.3 t ha-1
. The use of both
microbiological preparations and compost gave approximately the same effect and increased
yields by 35–37% compared to the control. The use of compost together with bio-preparations
provided an output of 27.6–29.3 t ha-1of potatoes. In 2019, the joint use of compost and biopreparations allowed to reach a yield of 40 tons ha-1 of marketable potatoes. On the basis of the
obtained data, the mathematical dependences of the yield of potatoes on the dose of compost, the
type of biological preparation and the complex indicator of the year conditions were determined
Surface impedance anisotropy of YBaCuO single crystals: electrodynamic basis of the measurements
An electrodynamic technique is developed for determining the components of
surface impedance and complex conductivity tensors of HTSC single crystals on
the basis of measured quantities of a quality factor and a resonator frequency
shift. A simple formula is obtained for a geometrical factor of a crystal in
the form of a plate with dimensions in a microwave magnetic field
. To obtain the c-axis complex conductivity from
measurements at we propose a procedure which
takes account of sample size effects. With the aid of the technique involved
temperature dependences of all impedance and conductivity tensors components of
YBaCuO single crystal, grown in BaZrO crucible, are
determined at a frequency of GHz in its normal and superconducting
states. All of them proved to be linear at , and their extrapolation
to zero temperature gives the values of residual surface resistance
and m and
magnetic field penetration depth nm and
m.Comment: 9 pages, 7 figures. Submitted to Phys.Rev.B 05Jun2002; accepted for
publication 21Febr200
Measurement of and between 3.12 and 3.72 GeV at the KEDR detector
Using the KEDR detector at the VEPP-4M collider, we have measured
the values of and at seven points of the center-of-mass
energy between 3.12 and 3.72 GeV. The total achieved accuracy is about or
better than at most of energy points with a systematic uncertainty of
about . At the moment it is the most accurate measurement of in
this energy range
New precise determination of the \tau lepton mass at KEDR detector
The status of the experiment on the precise lepton mass measurement
running at the VEPP-4M collider with the KEDR detector is reported. The mass
value is evaluated from the cross section behaviour around the
production threshold. The preliminary result based on 6.7 pb of data is
MeV. Using 0.8 pb of data
collected at the peak the preliminary result is also obtained:
eV.Comment: 6 pages, 8 figures; The 9th International Workshop on Tau-Lepton
Physics, Tau0
Search for narrow resonances in e+ e- annihilation between 1.85 and 3.1 GeV with the KEDR Detector
We report results of a search for narrow resonances in e+ e- annihilation at
center-of-mass energies between 1.85 and 3.1 GeV performed with the KEDR
detector at the VEPP-4M e+ e- collider. The upper limit on the leptonic width
of a narrow resonance Gamma(R -> ee) Br(R -> hadr) < 120 eV has been obtained
(at 90 % C.L.)
Measurement of \Gamma_{ee}(J/\psi)*Br(J/\psi->e^+e^-) and \Gamma_{ee}(J/\psi)*Br(J/\psi->\mu^+\mu^-)
The products of the electron width of the J/\psi meson and the branching
fraction of its decays to the lepton pairs were measured using data from the
KEDR experiment at the VEPP-4M electron-positron collider. The results are
\Gamma_{ee}(J/\psi)*Br(J/\psi->e^+e^-)=(0.3323\pm0.0064\pm0.0048) keV,
\Gamma_{ee}(J/\psi)*Br(J/\psi->\mu^+\mu^-)=(0.3318\pm0.0052\pm0.0063) keV.
Their combinations
\Gamma_{ee}\times(\Gamma_{ee}+\Gamma_{\mu\mu})/\Gamma=(0.6641\pm0.0082\pm0.0100)
keV,
\Gamma_{ee}/\Gamma_{\mu\mu}=1.002\pm0.021\pm0.013 can be used to improve
theaccuracy of the leptonic and full widths and test leptonic universality.
Assuming e\mu universality and using the world average value of the lepton
branching fraction, we also determine the leptonic \Gamma_{ll}=5.59\pm0.12 keV
and total \Gamma=94.1\pm2.7 keV widths of the J/\psi meson.Comment: 7 pages, 6 figure
Measurement of main parameters of the \psi(2S) resonance
A high-precision determination of the main parameters of the \psi(2S)
resonance has been performed with the KEDR detector at the VEPP-4M e^{+}e^{-}
collider in three scans of the \psi(2S) -- \psi(3770) energy range. Fitting the
energy dependence of the multihadron cross section in the vicinity of the
\psi(2S) we obtained the mass value
M = 3686.114 +- 0.007 +- 0.011 ^{+0.002}_{-0.012} MeV and the product of the
electron partial width by the branching fraction into hadrons \Gamma_{ee}*B_{h}
= 2.233 +- 0.015 +- 0.037 +- 0.020 keV.
The third error quoted is an estimate of the model dependence of the result
due to assumptions on the interference effects in the cross section of the
single-photon e^{+}e^{-} annihilation to hadrons explicitly considered in this
work.
Implicitly, the same assumptions were employed to obtain the charmonium
leptonic width and the absolute branching fractions in many experiments.
Using the result presented and the world average values of the electron and
hadron branching fractions, one obtains the electron partial width and the
total width of the \psi(2S):
\Gamma_{ee} =2.282 +- 0.015 +- 0.038 +- 0.021 keV,
\Gamma = 296 +- 2 +- 8 +- 3 keV.
These results are consistent with and more than two times more precise than
any of the previous experiments
GENETIC ASPECTS OF ATRIAL FIBRILLATION ON THE BACKGROUND OF ARTERIAL HYPERTENSION IN COMBINATION WITH NONCARDIAC DISEASES
Objective: To study genetic determinants in patients with atrial fibrillation (AF) on the background of arterial hypertension (AH) in combination with various extracardiac comorbid pathology.
Methods: In a prospective cohort study included 167 patients with paroxysmal and persistent forms of AF and stage II hypertension without CAD. The average age of the patients studied was 53.3±7.1 years. DNA isolation from blood leukocytes was carried out by phenol-chloroform extraction. Testing polymorphism rs2200733, polymorphism 174G/C (174G/C (rs1800795) gene IL6), the IL6 gene performed with PCR with RFLP. Testing of statistical hypotheses was carried out at a critical level of significance p=0.05, i.e. the difference was considered statistically significant at p<0.05. The lower limit of the evidential power was taken equal to 80%.
Results: This study shows associations of polymorphisms 174G/C (rs1800795) of the IL6 gene, the IL6 gene and rs2200733 chromosome 4q25 with AF on the background of comorbidities: AH, chronic obstructive pulmonary disease, hypothyroidism, T2DM, abdominal obesity. Associations of polymorphism 174G/C (rs1800795) of the IL6 gene with the risk of recurrence of AF on the background of individual comorbidities were also found; polymorphism rs2200733 chromosome 4q25 with triglyceride levels, index atherogenicity, creatinine, fibrinogen, with the number of months before the development of relapse; 174G/C (rs1800795) of the IL6 gene – with HDL cholesterol levels, creatinine, diastolic blood pressure, galectin-3.
Conclusion: The results contributes to the study of such a complex phenomenon as the secondary form of atrial fibrillation, contributes to the accumulation of knowledge, bringing closer the time when therapeutic interventions will be individualized, based on an understanding of the pathological process in each patie
Trend removal and filtering of TEC data by empirical mode decomposition
© 2020 URSI. This article describes a method of empirical mode decomposition that allows processing nonlinear and nonstationary signals. This method was used to remove the trend and filter the data of slant total electron content (hereinafter TEC). The results obtained are compared with the most commonly used approaches to processing total electron content data, which include digital filtering methods such as moving average filtering and removing the trend from the data of total electron content by subtracting approximating polynomials
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