499 research outputs found
The plate archive of the Sternberg Astronomical Institute
Program available at: http://www.imcce.fr/hosted_sites/naroo/program.htmlInternational audienceThe photographic observations in the Sternberg Astronomical Institute started in 1895. Observations were made with sept telescopes in Moscou and Crimea. In total, until 2004, almost 60 000 photographic plates have been accumulated. Most of them have been made to study variable stars and galaxies. Only the 9 000 from 60 000 photographic plates were made to determine the coordinates of Mars, Venus and selected asteroids. These photographic plates are processed. Some of obtained results are published. These 9 000 plates may be the subject of a new processing with the new star catalogs after they are scanned. This work can be undertaken if there is interest in new astrometric data with a modest accuracy for Mars, Venus, and selected asteroids. This year, work has begun to search for objects of the solar system in other 51 000 photographic plates made to study variable stars and galaxies. The main interest was in finding the planets with natural satellites. For given moments of exposure and the coordinates of the field center using a relevant software, we determine the presence of planets on each plate. A significant problem is that most of plates are identified only by the name of the galaxy or star. Our problem is also that only for 25 000 plates we have the moments and the coordinates recorded in the files. For the remaining 26 000 plates these data are still noted on paper. Of the 25 000 examined plates only on 340 of them the planets were found. We should also identify and write to file such data for 26,000 plates to search for planets with our software. For half of the 51 000 plates expected astrometric accuracy is of about 0.2 arcseconds and for other plates the accuracy is not better than 1 arcsecond of arc. About 1 700 photographic plates were scanned for photometric purposes. However astrometric accuracy of the scan does not match the possible accuracy of photographic plates
Estudio de la actividad motora del niño en la escuela utilizando dispositivos portátiles individuales - rastreadores de actividad física
They presented the results of qualitative and quantitative indicator study concerning the motor activity of schoolchildren of both sexes, obtained by using individual wearable devices-fitness trackers. It was found that 8.2% of students, regardless of gender and age, are characterized by low values of this indicator; 3.4% demonstrate high values of the indicator relative to the hygiene norm.Se presentan los resultados del estudio de indicadores cualitativos y cuantitativos sobre la actividad motora de escolares de ambos sexos, obtenidos mediante el uso de dispositivos portátiles individuales: rastreadores de estado físico. Se encontró que el 8.2% de los estudiantes, independientemente de su sexo y edad, se caracterizan por valores bajos de este indicador; El 3,4% demuestra valores altos del indicador en relación con la norma de higiene
Using Wearable Devices to Stimulate Students Motor of Physical Activity and Consequence Physcological Responce
They presented the results of qualitative and quantitative indicator study concerning the motor activity of schoolchildren of both sexes, obtained by using individual wearable devices-fitness trackers. It was found that 8.2% of students, regardless of gender and age, are characterized by low values of this indicator; 3.4% demonstrate high values of the indicator relative to the hygiene norm.They presented the results of qualitative and quantitative indicator study concerning the motor activity of schoolchildren of both sexes, obtained by using individual wearable devices-fitness trackers. It was found that 8.2% of students, regardless of gender and age, are characterized by low values of this indicator; 3.4% demonstrate high values of the indicator relative to the hygiene norm
Uso de dispositivos portátiles para estimular a los estudiantes el motor de la actividad física y la consecuencia de la respuesta fisiológica
They presented the results of qualitative and quantitative indicator study concerning the motor activity of schoolchildren of both sexes, obtained by using individual wearable devices-fitness trackers. It was found that 8.2% of students, regardless of gender and age, are characterized by low values of this indicator; 3.4% demonstrate high values of the indicator relative to the hygiene norm.Presentaron los resultados del estudio de indicadores cualitativos y cuantitativos sobre la actividad motora de escolares de ambos sexos, obtenidos mediante el uso de dispositivos portátiles individuales: rastreadores de estado físico. Se encontró que el 8.2% de los estudiantes, independientemente de su sexo y edad, se caracterizan por valores bajos de este indicador; El 3,4% demuestra valores altos del indicador en relación con la norma de higiene
Позднее обнаружение туберкулеза легких на современном этапе
Institute of phthisiopneumology „Chiril Draganiuc”, Congresul III al Medicilor de Familie din Republica Moldova 17–18 mai, 2012, Chişinău, Republica MoldovaIntroducere
În prezent depistarea tuberculozei se efectuează, de regulă,
la simptomatici, prin adresare. S-a majorat numărul cazurilor de
tuberculoză tardiv depistată, care influenţează negativ prognoza
bolii. În acelaşi timp, nu este determinată definiţia contemporană
„depistarea tuberculozei tardive”. Nu este clar rolul acestor cazuri
în insuccesul tratamentului şi mortalitatea prin tuberculoză. Este
necesar de determinat frecvenţa cazurilor tardiv depistate de
tuberculoză, ineficacitatea tratamentului şi de elaborat un sistem
perfecţionat în depistarea şi organizarea tratamentului. Metodele
perfecţionate ale depistării bolnavilor cu tuberculoză pulmonară,
reducerea erorilor în diagnosticarea şi organizarea chimioterapiei
adecvate vor permite ridicarea eficacităţii tratamentului şi micşorarea mortalităţii prin tuberculoză.
Material şi metode
Au fost examinaţi 157 de bolnavi tardiv depistaţi din trei
teritorii rurale: raionul Orhei – 64, Călăraşi – 46, Ialoveni – 47. În
grupul de comparaţie au fost examinaţi 132 de bolnavi depistaţi
la timp din aceleaşi teritorii rurale: raionul Orhei – 37, Călăraşi
– 34, Ialoveni – 61. Metodele de cercetare au fost tradiţionale
pentru practica ftiziologică: examinare clinică, metode imagistice
(microradiofotografia, radiografia, tomografia), examinări microbiologice (bacterioscopia, însămânţarea, BACTEC), testarea
la tuberculină, metode instrumentale, cercetări morfopatologice.
Rezultate obţinute şi discuţii
Din 267 de bolnavi prim depistaţi din teritoriile susnumite,
tardiv depistaţi au fost 58,8%. În raionul Orhei acest număr a alcătuit 62,7% (64 din 102), în raionul Călăraşi – 56,8% (46 din
81), în raionul Ialoveni – 56,0% (47 din 84). Printre bolnavi tardiv
depistaţi, bărbaţi au fost 77,7%, femei – 22,3%. Printre bolnavii
depistaţi la timp, bărbaţi au fost 64,4%, femei – 35,6%. În grupul
bolnavilor depistaţi la timp femeile au fost de 1,6 ori mai multe.
Majoritatea bolnavilor în ambele grupuri erau în vârstă aptă de
muncă. Din numărul total al bolnavilor tardiv depistaţi 120 (76,4%)
n-au fost angajaţi în câmpul muncii, printre bolnavii depistaţi la
timp – 84 (63,5%), de 1,2 ori mai mic. A fost determinat modul
de îndreptare a bolnavilor tardiv depistaţi şi depistaţi la timp în
cabinetele antituberculoase. Majoritatea bolnavilor tardiv depistaţi
(85,3%) au fost depistaţi prin adresare (adresarea la medicul de
familie, alţi specialişti, adresarea directă). Printre bolnavii depistaţi la timp acest indicator a alcătuit 49,2%, de 1,7 ori mai mic.
Forma clinică de bază printre bolnavii tardiv depistaţi (68,5%)
a fost tuberculoza infiltrativă cu distrucţie. Din 106 bolnavi cu
tuberculoză infiltrativă distructivă 85 (80,2%) au avut distrucţie
monolaterală, 21 (19,8%) – bilaterală. Din numărul total (157) al
bolnavilor examinaţi 126 (80,3%) erau baciliferi, 15 (9,5%) – n-au
eliminat micobacterii de tuberculoză, 16 (10,2%) – n-au fost examinaţi (diagnosticaţi postmortem). Din numărul bolnavilor tardiv
depistaţi la 38 (30,2%) a fost determinată multidrogrezistenţa.
Forma clinică de bază (68,5%) la bolnavii depistaţi la timp a fost
tuberculoza infiltrativă fără distrucţie. Din numărul total (132) al
bolnavilor examinaţi 69 (52,3%) erau baciliferi. Din ei la 7 (10,1%)
bolnavi a fost determinată multidrogrezistenţa. Aşadar, numărul
eliminatorilor de bacili printre bolnavii tardiv depistaţi era de 1,5
ori mai mare decât printre bolnavii depistaţi la timp. Numărul
baciliferilor cu multidrogrezistenţă printre bolnavii tardiv depistaţi era de 3,0 ori mai mare decât printre bolnavii depistaţi la
timp. Au fost evaluate rezultatele supravegherii bolnavilor tardiv
depistaţi în termenul 6–12 luni. Acest termen este insuficient
pentru concluzii argumentate în eficacitatea tratamentului. La 71
de bolnavi lipsesc datele despre tratament. În acelaşi timp, printre
86 de bolnavi (care au avut datele despre tratament) efectul pozitiv a avut loc numai la 24 (27,9%) dintre ei, acest rezultat fiind
nesatisfăcător, deoarece eficacitatea tratamentului trebuie să fie
de 85% conform recomandărilor OMS. La 55 de bolnavi depistaţi
la timp datele despre tratament lipsesc. În acelaşi timp printre 77
de bolnavi, efectul pozitiv a fost la 61 (79,2%) ceea ce constituie
un rezultat destul de satisfăcător. Printre bolnavii tardiv depistaţi
acest indicator era de 2,8 ori mai jos.
Concluzii
Bolnavii tardiv depistaţi alcătuiesc o parte destul de impunătoare printre contingentele de bolnavi cu tuberculoză pulmonară şi, în
ansamblu, pondera lor în teritoriile examinate ajunge la 58,8% şi
deviază de la 56,0% până la 62,7%, ceea ce este legat de organizarea
calităţii depistării tuberculozei. Bolnavii de tuberculoză tardiv
depistaţi, după statutul lor reprezintă un contingent foarte complicat în plan social şi medical, în comparaţie cu bolnavii depistaţi
la timp. Posibilitatea efectului pozitiv după tratamentul acestor
bolnavi este mai joasă, decât la bolnavii depistaţi la timp. Pentru
îmbunătăţirea eficacităţii tratamentului bolnavilor de tuberculoză
este necesar de ridicat nivelul depistării precoce
Dielectric and magnetic responses in nanocrystalline BaTiO3
This work was supported by Russian Foundation for Basic Research (Research Project No.18-52-00039 Bel_a)
Eight exoplanet candidates in SAO survey
Here we present eight new candidates for exoplanets detected by the transit
method at the Special Astrophysical Observatory of the Russian Academy of
Sciences. Photometric observations were performed with a 50-cm robotic
telescope during the second half of 2020. We detected transits with depths of
and periods in the light curves
of stars with magnitudes of . All considered stars are
classified as dwarfs with radii of (with the
uncertainty for one star up to ). We estimated the candidate radii
(all are greater than 1.4 times the Jovian radius), semi-major axes of their
orbits (), and other orbital parameters by modelling. We report
the light curves with transits for two stars obtained in 2022 based on
individual observations.Comment: 16 pages, 14 figures, 3 table
Spectacular enhancement of the thermal and photochemical stability of mapbi3 perovskite films using functionalized tetraazaadamantane as a molecular modifier
Perovskite solar cells represent a highly promising third-generation photovoltaic tech-nology. However, their practical implementation is hindered by low device operational stability, mostly related to facile degradation of the absorber materials under exposure to light and elevated temperatures. Improving the intrinsic stability of complex lead halides is a big scientific challenge, which might be addressed using various “molecular modifiers”. These modifiers are usually rep-resented by some additives undergoing strong interactions with the perovskite absorber material, resulting in enhanced solar cell efficiency and/or operational stability. Herein, we present a deriva-tive of 1,4,6,10-tetraazaadamantane, NAdCl, as a promising molecular modifier for lead halide perovskites. NAdCl spectacularly improved both the thermal and photochemical stability of methy-lammonium lead iodide (MAPbI3 ) films and, most importantly, prevented the formation of metallic lead Pb0 as a photolysis product. NAdCl improves the electronic quality of perovskite films by healing the traps for charge carriers. Furthermore, it strongly interacts with the perovskite framework and most likely stabilizes undercoordinated Pb2+ ions, which are responsible for Pb0 formation under light exposure. The obtained results feature 1,4,6,10-tetraazaadamantane derivatives as highly promising molecular modifiers that might help to improve the operational lifetime of perovskite solar cells and facilitate the practical implementation of this photovoltaic technology. © 2021 by the authors. Licensee MDPI, Basel, Switzerland.This work was supported by Russian Science Foundation (project No. 19-73-30020). The XPS measurements were supported by the Ministry of Education and Science of the Russian Federation (project FEUZ-2020-0060), Theme ‘Electron’, no. AAAA-A18-118020190098-5 and Russian Foundation for Basic Research (project No. 21-52-52002)
Optical and Radio Variability of the Blazar S4 0954+658
We present an optical-to-radio study of the BL Lac object S4 0954+658
observations during 1998-2023. The measurements were obtained with the SAO RAS
Zeiss-1000 1-m and AS-500/2 0.5-m telescopes in 2003-2023, with the RATAN-600
radio telescope at 1.25 (0.96, 1.1), 2.3, 4.7 (3.7, 3.9), 8.2 (7.7), 11.2, 22.3
(21.7) GHz in 1998-2023, with the IAA RAS RT-32 Zelenchukskaya and Badary
telescopes at 5.05 and 8.63 GHz in 2020--2023, and with the RT-22 single-dish
telescope of CrAO RAS at 36.8 GHz in 2009-2023. In this period the blazar had
been showing extremely high broadband activity with the variability amplitude
of flux densities up to 70-100% both in the optical and radio domains. In the
period of 2014-2023 the blazar had been showing the historically highest
activity in the radio wavelengths, and we detected multiple radio flares of
varying amplitude and duration. The large flares last on average from 0.3 to 1
year at 22-36.8 GHz and slightly longer at 5-11.2 GHz. The optical flares are
shorter and last 7-50 days. In the most active epoch of 2018-2023 the
characteristic time scale of variation at 5-22 GHz is about 100 days and
about 1000 days for the state with lower activity in 2009-2014. We found a
general correlation between the optical, radio, and -ray flux
variations, which suggests that we observe the same photon population from
different emission regions. We estimated linear size of this region as 0.5-2 pc
for different epochs. A broadband two components radio spectrum of S4 0954+658
jet was modelled by using both electrons and protons as emitting particles. It
is shown that the synchrotron radio waves in this AGN may be generated by
relativistic protons.Comment: Published in Astrophysical Bulletin Vol.78, N4 (2023
Mutual positions of the Galilean satellites of Jupiter from photometric observations during their mutual occultations and eclipses in 1997
We report the final results of the 1997 campaign of
photometric observations of the mutual phenomena of the Galilean
satellites carried out at observatories in Kazakhstan, Russia, and
Ukraine. Our results contribute substantially to the
world data bank of such observations
and will allow the model of the motion of Galilean
satellites to be further refined. To facilitate the use of
photometric data, we reduced them by computing the planetocentric
rectangular
coordinate differences of satellite pairs for a number of instants
of time so we deduce the differences for one instant from one
observed light curve.
It is these reduced data that constitute the principal
result of this work. We based our data reduction on the method
which we developed in
earlier papers (Emel'yanov 1999; Emel'yanov 2000). The accuracy
of observations was estimated in the process of reduction. The
paper also describes the equipment used.
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