The reaction of
N
-substituted amides of 3-amino-4,6-diarylthieno2,3-
b
pyridine-2-carboxylic acids with ninhydrin in the presence of catalytic amounts of sulfuric acid gave ...1′-spiroindene-2,2′-pyrido3′,2′:4,5thieno3,2-
d
pyrimidine-1,3,4′(3′
H
)-triones. Structure of a number of key compounds was studied using 2D NMR spectroscopy; the bioavailability parameters of the obtained compounds
in silico
were calculated. In a laboratory experiment, a moderate antidote effect was revealed with respect to the 2,4-D herbicide for one compound.
To assess experimentally different laparotomy closure techniques.
Experimental research on laboratory animals was performed. Laboratory animals underwent laparotomy followed by aponeurosis suturing ...by using of interrupted, continuous suture and continuous suture with an arrangement of stitches at different levels. Tensometric and histological examination of tissue specimens together with sutures was made in 7, 14, 60 days after surgery.
Correlation of laparotomy closure technique with values of durability, elasticity and wound process course was obtained.
Continuous suture after laparotomy promotes the formation of more mature granulation tissue and more solid scar with low elasticity compared with interrupted sutures.
The reaction of 2,6-dichloro-4-methylnicotinonitrile with malononitrile dimer in the presence of triethylamine leads to regioselective nucleophilic substitution of the chlorine atom at position 6 ...with the formation of triethylammonium 2-amino-3-(6-chloro-5-cyano-4-methyl-pyridin-2-yl)-1,1,3-tricyanoprop-2-en-1-ide. The structure of the product was confirmed by spectral methods and X-ray diffraction analysis.
We propose and optimize theoretically a supercontinuum (SC) laser source in the mid-IR based on using As-Se-Te/As-S core/clad step-index fibers and a femtosecond all-fiber laser system at 2μm. ...Numerically simulated spectra extending from ~1μm to >8μm are demonstrated for pump energy of order 100pJ in a fiber with a core diameter of 2μm. To the best of our knowledge, the possibility of such long-wavelength spectral conversion of pump pulses at the wavelength of 2μm in optical fibers is demonstrated for the first time. The theoretical calculations are performed on the base of real low loss step-index As-Se-Te/As-S glass fibers with various core-clad diameter ratios.
•Mid-IR SC generation in As-Se-Te/As-S fibers pumped at 2μm is studied numerically.•Simulated spectra extending from ~1μm to >8μm are demonstrated.•Low-loss As-Se-Te/As-S step-index fibers are manufactured.
In this paper the influence of transfer learning on the accuracy of classification and localization of the YOLO detector in the problem of transport traffic analysis is studied. The authors research ...the possibility of adaptation of neural network model to specific scenarios. Adaptation is supposed to be carried out by transfer learning with freezing of some network layers. In the paper the dependence of the model accuracy in the process of transfer learning by specifying the number of frozen layers is shown. Several YOLOv5 models have been studied: «nano», «small», and «medium». Experimental research has been carried out on new custom dataset, and conclusion has been made about the effectiveness of transfer learning for vehicle classification and localization based on performance metrics.
Numerical modeling was applied to study the generation of transversal jet filaments observed in the summer of 1999 after an upwelling event off the northern coast of the Gulf of Finland. An eddy ...resolving model well reproduces the mesoscale coherent structures observed. It was shown that they represent manifestations of instability of alongshore baroclinic jet currents of an upwelling-downwelling origin. An estimate of the effective lateral eddy diffusivity in the mesoscale coherent structures equal to 500 m
2
/s was obtained as a result of statistical processing of pseudorandom model fields of the temperature and current velocity.
A method for estimating the absolute values of forces produced by nickel-titanium orthodontic wires at superelastic deformations is proposed. The method is based on both the elasticity theory and the ...experimental bending tests for the nickel-titanium wires. Forces for a number of nickel-titanium wires are calculated by this method. (Am J Orthod Dentofacial Orthop 2001;119:604-9)
Intrusions observed in the regions of intense mesoscale eddies of the Baltic Sea are studied. The study is based on the data of the closely spaced CTD profilings performed in the Eastern Gotland ...Basin after the major inflow of 1993. The results obtained supplement the interleaving analysis presented in 6. Special attention is focused on the description of the intrusions in the intrahalocline cyclonic eddy that was formed during the inflow. A
T, S
-analysis of the water structure in mesoscale eddies and beyond them revealed the following features: (a) a substantial difference between the
T, S
indices in cyclonic and anticyclonic eddies, and (b) a gradual decrease in the salinity of the modified North Sea waters is observed during their propagation into the basin. A phenomenological description of the exchange and mixing processes in the Baltic halocline based on the results of numerical simulation of mesoscale eddies formed during the inflow event and an empirical analysis of the interleaving are suggested.
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