Purpose: assess the level of physical health and physical preparedness of students 17–19 years to develop a program of sectional classes in Thai boxing. Material & Methods: analysis of scientific and ...methodological literature, pedagogical observation, pedagogical experiment, anthropometric, physiological methods of research, pedagogical testing of physical preparedness, express assessment of physical health by the method of G. L. Apanasenko, methods of mathematical statistics. The study involved 77 young students aged 17–19 years. Results: obtained data during the experiment showed a predominantly low and below average level of physical health, as well as the lag of some physical qualities from age standards. Conclusion: the evaluation of physical health and physical preparedness indicators of 17–19 years old boys testifies to the need to develop and implement training programs aimed at increasing the level of physical health and the development of physical qualities.
Development of organic semiconducting polymers combining simple and scalable synthesis with high stability, solubility and hole mobility is in high demand. In this work, we report two novel D–π–A ...triphenylamine-based homopolymers having thiophene as a side π-spacer linked to either hexyl- or 4-fluorophenyldicyanovinyl electron-withdrawing groups. The homopolymers can be easily synthesized
via
oxidative polymerization at room temperature of the corresponding monomers in the presence of FeCl
3
as an oxidant. The polymers possess a number of valuable properties for application in organic and hybrid optoelectronics, among which are high electrochemical and thermal stability (
T
d
is up to 594 °C; coke yield up to 90%), good solubility (up to 90 g L
−1
in chloroform), high glass transition temperature (up to 223 °C), efficient light absorption in the UV-Vis region, low-lying HOMO energy levels (
ca.
5.36 eV) and sufficient hole mobility (up to 7 × 10
−5
cm
2
V
−1
s
−1
) without any posttreatment in thin films.
A convenient synthetic route for the preparation of α-aminophosphonate derivatives of triethoxysilane, attractive precursors for silica surface functionalization, was developed. The condensation of ...commercially available APTES with carbonyl compounds followed by Pudovik reaction of imines with diethyl phosphite yielded desired N-phosphonomethyl functionalized (3-aminopropyl)triethoxysilanes in high yields without further purification. The chemical structures of obtained products were undoubtedly proved by
1
H,
13
C and
31
P NMR spectroscopy, elemental analysis and mass spectrometry.
Development of organic semiconducting polymers combining simple and scalable synthesis with high stability, solubility and hole mobility is in high demand. In this work, we report two novel D-π-A ...triphenylamine-based homopolymers having thiophene as a side π-spacer linked to either hexyl- or 4-fluorophenyldicyanovinyl electron-withdrawing groups. The homopolymers can be easily synthesized
via
oxidative polymerization at room temperature of the corresponding monomers in the presence of FeCl
3
as an oxidant. The polymers possess a number of valuable properties for application in organic and hybrid optoelectronics, among which are high electrochemical and thermal stability (
T
d
is up to 594 °C; coke yield up to 90%), good solubility (up to 90 g L
−1
in chloroform), high glass transition temperature (up to 223 °C), efficient light absorption in the UV-Vis region, low-lying HOMO energy levels (
ca.
5.36 eV) and sufficient hole mobility (up to 7 × 10
−5
cm
2
V
−1
s
−1
) without any posttreatment in thin films.
Polymers combining high electrochemical and thermal stability, good solubility, high
T
g
and high coke residue with low-lying HOMO levels and reasonable hole mobilities in thin films are reported in this study.
An approach that allows one to determine the unloaded quality factor of a quasi-optical dielectric resonator (QDR) under conditions of the resonance line splitting corresponding to twofold ...degenerative whispering gallery (WG) mode has been proposed. The resonator is represented by an equivalent network as two oscillatory circuits with a certain coupling between them. The approach allows one to determine the Q-factor of a single oscillatory circuit using three measured parameters, namely: 1) ratio between specific amplitudes of the resonator amplitude-frequency response (or its second derivative); 2) resonant frequency; and 3) frequency splitting of the response (or its respective second derivative). The proposed technique is illustrated by the measurements in the millimeter-wave range for sapphire quasi-optical resonators with conducting and high-T/sub c/ superconducting (HTS) film endplates.
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