814 research outputs found
Post-Newtonian Theory for Precision Doppler Measurements of Binary Star Orbits
The determination of velocities of stars from precise Doppler measurements is
described here using relativistic theory of astronomical reference frames so as
to determine the Keplerian and post-Keplerian parameters of binary systems. We
apply successive Lorentz transformations and the relativistic equation of light
propagation to establish the exact treatment of Doppler effect in binary
systems both in special and general relativity theories. As a result, the
Doppler shift is a sum of (1) linear in terms, which include the
ordinary Doppler effect and its variation due to the secular radial
acceleration of the binary with respect to observer; (2) terms proportional to
, which include the contributions from the quadratic Doppler effect
caused by the relative motion of binary star with respect to the Solar system,
motion of the particle emitting light and diurnal rotational motion of
observer, orbital motion of the star around the binary's barycenter, and
orbital motion of the Earth; and (3) terms proportional to , which
include the contributions from redshifts due to gravitational fields of the
star, star's companion, Galaxy, Solar system, and the Earth. After
parameterization of the binary's orbit we find that the presence of
periodically changing terms in the Doppler schift enables us disentangling
different terms and measuring, along with the well known Keplerian parameters
of the binary, four additional post-Keplerian parameters, including the
inclination angle of the binary's orbit, . We briefly discuss feasibility of
practical implementation of these theoretical results, which crucially depends
on further progress in the technique of precision Doppler measurements.Comment: Minor changes, 1 Figure included, submitted to Astrophys.
Психологический отбор в игровых видах спорта на примере баскетбола
For the first time, an integrated approach based on the assessment of the technical and tactical skills of basketball players in combination with the psychological selection was used for selectionthe candidates for the Ukrainian cadet team. From the 144 athletes, who participated in the Ukrainian Championship, 36 players were selected based on the level of technical and tactical skills. According to the results of the psychological tests main characteristics of basketball players were defended and recommendations for coaches were given. As a result, 18 players, who were selected using psychological methods, had better technical and tactical mastery. They took part in the training process for preparation for the main competitions of the year (European Championship).Вперше застосовано комплексний підхід на основі оцінки техніко-тактичної мастерності баскетболістів в поєднанні з психологічним відбором кандидатів у кадетську збірну команду України для проведення навчально-тренувальних зборів. Зі 144 спортсменів, які брали участь у чемпіонаті України, відібрано 36 гравців по результатам визначення рівня техніко-тактичної майстерності. За підсумками проведених досліджень по вивченню психологічних характеристик баскетболістів відібрано 18 гравців для проведення навчально-тренувального процесу по підготовці до головних змагань року (чемпіонату Європи).Впервые был применен комплексный подход на основе оценки технико-тактического мастерства баскетболистов в сочетании с психологическим отбором кандидатов в кадетскую сборную Украины для проведения учебно-тренировочных сборов. Из 144 спортсменов, которые участвовали в чемпионате Украины, отобрано 36 игроков по результатам определения уровня технико-тактического мастерства. По итогам проведенных исследований по изучению психологических характеристик баскетболистов отобрано 18 игроков для проведения учебно-тренировочного процесса по подготовке к главным соревнованиям года (чемпионату Европы)
Expression of pinopodies in women with endometry hyperplasia without atipy and fertility disorders
Non-atypical endometrial hyperplasia (EH) most often occurs against a background of
relative or absolute hyperestrogenism, responds to abnormal hormonal effects. In the
reproductive age, the presence of EH can be a factor in the development of fertility disorders.
The aim of the study was to learn the expression of pinopodes in ovulatory infertile women
with non-atypical EH on the day of the implantation window. Under observation there were
196 women of reproductive age, of which 166 had been treated for infertility, and 30
conditionally gynecologically and somatically healthy, fertile women of the control group. A
special examination of women included the determination in the endometrium by scanning
electron microscopy of pinopodes’ expression. It was found that in women with non-atypical
hyperplasia of the endometrium, areas without pinopodia were recorded in 47.59% of cases,
pinopodes of small size - in 79.52% and abundant, small, thick microvilli - in 37.95%; the
decrease in the incidence of developed pineapods in comparison with healthy prolific women
was 2.72 times, that of pinopodes of large size was 3.39 and the small number of microvilli
was 3.64, an increase in the occurrence of pinopodes of medium size 3.65, microvilli in
moderate amounts - at 3.74. The authors conclude that the characteristic feature of
endometrial pinopodes in EH is the presence of mosaicism of their shape (60.24%), size (64.46%) and the presence of numerous areas of absence of pinopodes (47.59%), which plays
a significant role in disorders fertility
Thermonuclear energy is a future source of energy
With the development of nuclear physics, the problem of getting energy from nuclear fusion is topical nowadays. Despite all the difficulties in implementation, thermonuclear energy is a highly efficient source. Therefore, this kind of energy can become a base of economical potential of the country
HYDROLYTIC STABILITY OF IMIDES OF DIFFERENT STRUCTURES
The conversion kinetics of N(o-carboxyphenyl)naphthalimide has been studied in buffer
solutions over a pH range 5-12.6 and temperature range 25-70 °C. The naphthalimide hydrolysis
is shown to be a reversible reaction. The mechanism of the alkaline hydrolysis of N(o-
carboxyphenyl) phthalimide is proposed. The structure dependence of the imide hydrolytic
stability is explained on the basis of the suggested mechanism
Exploring social media recruitment strategies and preliminary acceptability of an mHealth tool for teens with eating disorders
(1) Background: The current study leveraged social media to connect with teens with EDs to identify population specific characteristics and to gather feedback on an mHealth intervention. (2) Methods: We recruited teens with EDs from social media in two phases: (1) Discovery Group, (2) Testing Group. The Discovery Group
Physical therapy methods in the treatment and rehabilitation of cancer patients
The results of the effective use of magnetic laser therapy in the treatment and rehabilitation of cancer patients were presented. The effect of magnetic-laser therapy in the treatment of radiation-induced reactions in the patients with head and neck cancer and in the patients with breast cancer was analyzed. High efficiency of lymphedema and lymphorrhea treatment in the postoperative period in the patients with breast cancer was proved. The results of rehabilitation of the patients with gastric cancer after surgical treatment were presented. These data indicate a high effectiveness of different physical methods of treatment and rehabilitation of cancer patients
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