511 research outputs found
Assessment of quality and safety of pork treated with low-temperature atmospheric-pressure plasma
It is known that processing methods ensuring partial or full microbial inactivation are quite limited. Therefore, it is of great interest to develop technique and technologies allowing the effective action on microorganisms without a significant influence on product properties. The use of cold plasma can be one of the promising methods of meat product treatment by cold sterilization. The present work examines a possibility of chilled meat treatment with low-temperature atmospheric-pressure plasma to increase its stability to microbial spoilage and extend shelf life. To obtain low temperature plasma, the equipment developed by the designing department “Plasmamed” was used. Chilled meat was treated with low-temperature atmospheric-pressure argon plasma for 5, 10, 20 and 30 min. Samples were stored at a temperature of 2–4 °C for 10 days. Organoleptic indices, moisture weight fraction, changes in pH and water activity were analyzed before treatment and during storage. Sanitary microbiological analyses were carried out by the following indicators: quantity of mesophilic aerobic and facultative anaerobic microorganisms (QMAFAnM), the presence and quantity of coliforms, Salmonella, Escherichia coli, Listeria monocytogenes, Proteus. It was shown that meat cold treatment with argon plasma inhibited the development of mesophilic microorganisms. The colony forming units detected in the samples after ten days of storage were determined by the duration of exposure to plasma. It was proved that meat treatment for 15 and 30 min had the bactericidal effect and facilitated an improvement in meat color during storage. The organoleptic indices of the samples treated with plasma corresponded to the requirements of standards and approved consumer characteristics
Study of the process in the c.m. energy range from threshold to 2 GeV with the CMD-3 detector
Using a data sample of 6.8 pb collected with the CMD-3 detector at the
VEPP-2000 collider we select about 2700 events of the process and measure its cross section at 12 energy ponts with about
6\% systematic uncertainty. From the angular distribution of produced nucleons
we obtain the ratio
Measurement of the cross section with the CMD-3 detector at the VEPP-2000 collider
The process has been studied in the
center-of-mass energy range from 1500 to 2000\,MeV using a data sample of 23
pb collected with the CMD-3 detector at the VEPP-2000 collider.
Using about 24000 selected events, the cross
section has been measured with a systematic uncertainty decreasing from 11.7\%
at 1500-1600\,MeV to 6.1\% above 1800\,MeV. A preliminary study of
production dynamics has been performed
Measurement of the cross section from threshold to 1.2 GeV with the CMD-3 detector
The cross section of the process has been measured in
the center of mass energy range from 0.32 to 1.2 GeV with the CMD-3 detector at
the electron-positron collider VEPP-2000. The measurement is based on a full
dataset collected below 1 GeV during three data taking seasons, corresponding
to an integrated luminosity of about 62 pb. In the dominant
-resonance region, a systematic uncertainty of 0.7% has been reached. At
energies around -resonance the production cross section was
measured for the first time with high energy resolution. The forward-backward
charge asymmetry in the production has also been measured. It
shows the strong deviation from the theoretical prediction based on
conventional sQED framework and is in good agreement with GVDM and
dispersive-based predictions. The impact of presented results on the evaluation
of the hadronic contribution to the anomalous magnetic moment of muon is
discussed.Comment: 52 pages, 36 figures; cosmetic changes of the text, fix fig.2 , fix
comment on used selection cuts in the attached radiative correction tabl
Measurement of the pion formfactor with CMD-3 detector and its implication to the hadronic contribution to muon (g-2)
The cross section of the process has been measured in
the center of mass energy range from 0.32 to 1.2 GeV with the CMD-3 detector at
the electron-positron collider VEPP-2000. The measurement is based on an
integrated luminosity of about 88 pb out of which 62 pb
constitutes a full dataset collected by CMD-3 at center-of-mass energies below
1 GeV. In the dominant region near -resonance a systematic uncertainty of
0.7% has been reached. The impact of presented results on the evaluation of the
hadronic contribution to the anomalous magnetic moment of muon is discussed.Comment: 6 pages, 3 figure
EFFECT OF THE WEIGHT OF SULFOETHYLPOLYSTYRENE ON THE SORPTION OF SILVER(I)AND COPPER(II) IN DYNAMIC CONDITIONS
In this research influence of weight on sorption of sulfoethylpolystyrene in dynamic conditions was studied. Selectivity coefficients KAg/Cuwere determined for sorbents with degree of substitution equal to 0.7. It was showed,that the dynamic capacity of the sorbent for ions of copper (II) and silver (I) increased with increasing of sorbent mass, but the selectivity of silver ions (I) and copper (II) was reduced.Исследование выполнено при финансовой поддержке РФФИ в рамках научного проекта № 16-33-00110 мол_а
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