digital video camera
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2022 ◽  
pp. 86-92
Author(s):  
A. G. Mamontova ◽  
E. N. Usoltseva ◽  
T. P. Pisklakova ◽  
E. M. Lepikhina ◽  
K. V. Nikushkina

Introduction. External manifestations of aging, and especially skin aging are the most important for modern women.Aim. The aim of our study was to identify a set of adverse factors that effect on the skin of women in menopausal transition (MP) and in postmenopause (PM), and to identify markers of skin aging in this category of women.Materials and methods. The study included 36 women in MP and PM suffering from MS. At the first stage, anamnesis was collected, anthropometric data and severity of MS were evaluated, and the hormonal profile of patients was determined. At the second stage, computer mapping of the skin was performed using the digital video camera Aramo SG with the skin XPpro program. Statistic analysis was performed using the SPSS v13.0 program. Spearman’s analysis was used to determine the relationship between anthropometric, clinical and anamnestic data and the measurements of skin condition of women in MP and PM. Results. According to the obtained data, the main triggers of skin aging of women in MP and PM are: the presence of metabolic disorders (obesity, metabolic syndrome), decrease of estradiol and progesterone levels in blood serum as well as increase of prolactin level and rhythm disturbance of melatonin secretion. Markers of skin aging in women with menopausal syndrome are decreased moisture, increased oiliness in T-zone, increased of skin pigmentation and enlarged pore size.Conclusions. The obtained data are useful for management involuting skin changes of women in PM and MP suffering from MS. The data justifies the relevancy to normalization not only the estradiol level, but other sex steroids, melatonin, as well as correction of metabolic endocrine processes, and treatment of MS.


2021 ◽  
Author(s):  
J. V. A. Vasconcelos ◽  
L. H. Miranda-Filho ◽  
A. J. F. Souza ◽  
A. R. C. Romaguera ◽  
A. L. R. Barbosa

Abstract The robot–environment–task triad provides many opportunities to revisit physical problems with fresh eyes. Hence, we develop a simple experiment to observe chaos in classical billiards with a macroscopic 3.38-meter long setup. Using a digital video camera, one records the dynamic time evolution of the interaction between a robot and Bunimovich stadium billiards with specular reflection. From the experimental time series, we calculate the Lyapunov exponent λ as a function of a geometric parameter. The results are in concordance with theoretical predictions. In addition, we determine the Poincaré surface of section from the experimental data and check its sensitivity to the initial conditions as a function of time.


PLoS ONE ◽  
2021 ◽  
Vol 16 (7) ◽  
pp. e0255339
Author(s):  
Vedran Hadžić ◽  
Aleš Germič ◽  
Aleš Filipčič

Wearable sensor systems are a emerging tools for the evaluation of the sport’s activity and can be used to quantify the external workload of the athlete. The main goal of this paper was to evaluate the validity and reliability of the “Armbeep inertial measurement unit” (IMU) sensor both in a closed tennis exercise and in open matchplay. Twentyfour junior tennis players performed a baseline drill and played matches, during which they wore a combined accelerometer and gyroscope sensor. Video footage was concomitantly recorded using a digital video camera. The agreement between the measurements was assessed with the intraclass correlation coefficient (ICC) and the standard error of measurement (SEM). A simple linear regression was used to predict the number of shots registered from the video and from the Armbeep IMU sensor’s data. The number of total forehand and backhand shots during the drill repetitions showed an excellent test and re-test reproducibility (ICC≥0.90). There was a significant relationship between the Armbeep IMU sensor’s number of contacts and the total number of shots (R2 = 0.938) which indicated the excellent reliability of the tested Armbeep IMU sensor for those parameters. Considering the accuracy of the total tennis shots and the small magnitude of error for wrist speed and acceleration, the Armbeep IMU sensor appears to be an appropriate on-court tool that can be used to monitor the hitting load during tennis practice and matches.


Author(s):  
A.V. Ovchinnikov ◽  

The paper proposes the implementation of a multispectral camera based on a digital video camera and a set of interference filters, which provides the formation of a sequential stream of spectral images. The results of verification of the generated spectral images are presented.


2021 ◽  
Vol 11 (5) ◽  
pp. 2345
Author(s):  
Trpimir Kujundžić ◽  
Mario Klanfar ◽  
Tomislav Korman ◽  
Zlatko Briševac

Among many factors that influence an excavator’s performance and productivity, the volume of the bucket load and duration of the excavator working cycle are crucial. In this paper, both factors were investigated, including the granulometric composition of the excavated material. The volume of material in the bucket was determined by photogrammetric analysis while the excavator cycle time was measured by analysis of video recordings captured by a digital video camera during the excavator operation. Interconnections between the angle of repose, slewing angle, particle size distribution of material, and their effects on hydraulic excavator productivity were analyzed. It was found that a larger number of fine particles in granular materials with a higher coefficient of uniformity resulted in an increase in the volume of the bucket load. Correlation analysis revealed significant interconnection between the bucket fill factor and swell factor. It was also found that calculation of the production rate according to ISO (International Organization for Standardization) standards was more accurate for materials with a higher angle of repose while the CECE (Committee for European Construction Equipment) standard was more appropriate for materials with lower angles of repose.


2020 ◽  
Vol 8 (1) ◽  
pp. 82-87
Author(s):  
Vladimir S. Korneyev ◽  
Valery A. Reichert

Examples of computer processing images of interference patterns (Newton rings) obtained by digital video camera are considered. The sequence of computer processing of the obtained images of interference patterns is described and the possibility of comparing them with a theoretical model of the intensity distribution, for which an interpolation formula is proposed, is shown. To compare the distributions, a software product was developed, a series of so-called «sliders», each of which changes one of the parameters of the interpolation formula. By changing the position of the «sliders», it is possible to approximate the parameters of the theoretical model to the distribution of the radiation intensity in a real interference pattern. Computer processing of images obtained by a digital video camera can be used in subsequent courses in the study of special disciplines, when performing research work, in processing measurement results and constructing models of physical phenomena.


2020 ◽  
Vol 8 (2) ◽  
pp. 88 ◽  
Author(s):  
Diana Vargas ◽  
Ravindra Jayaratne ◽  
Edgar Mendoza ◽  
Rodolfo Silva

This paper describes a new set of experiments focused on estimating time series of the free surface elevation of water (FSEW) from velocities recorded by submerged air bubbles under regular and irregular waves using a low-cost non-intrusive technique. The main purpose is to compute wave heights and periods using time series of velocities recorded at any depth. The velocities were taken from the tracking of a bubble curtain with only one high-speed digital video camera and a bubble generator. These experiments eliminate the need of intrusive instruments while the methodology can also be applied if the free surface is not visible or even if only part of the depth can be recorded. The estimation of the FSEW was successful for regular waves and reasonably accurate for irregular waves. Moreover, the algorithm to reconstruct the FSEW showed better results for larger wave amplitudes.


2020 ◽  
Vol 1 ◽  
pp. 185-190
Author(s):  
Vladimir S. Korneyev ◽  
Valery A. Raychert

Examples of a laboratory work on wave optics are considered, in which, using the MS Office Excel program, computer processing of images of interference patterns (Newton's rings) obtained with a digital video camera is performed. The sequence of computer processing of the obtained images is described and the possibility of comparing the experimentally obtained data with theoretical models of the intensity distribution is shown. Computer processing of the images obtained with the digital video camera can be used in subsequent courses in the study of special disciplines, when performing research work, in processing measurement results and constructing models of physical phenomena.


2020 ◽  
Vol 18 (5) ◽  
pp. 550-555
Author(s):  
E. I. Bon ◽  
◽  
S. M. Zimatkin ◽  
N. Ye. Maksimovich ◽  
K. E. Bashlakova ◽  
...  

Objective. To analyze the changes in the size and shape of perikaryons and the degree of cytoplasm chromatophilia of the rat hippocampal and parietal cortex neurons at different periods after the modeling of total cerebral ischemia. Material and Methods. The experiments were performed on 42 male outbred white rats with an initial weight of 240 ± 20 g. Total cerebral ischemia in white outbred rats was modeled by decapitation. The material for further histological examination was taken at the 1st, 5th, 15th, 30th and 60th minutes, as well as 5 and 24 hours after decapitation. The study of histological preparations was carried out using an Axioscop 2 plus microscope, a digital video camera and the ImageWarp image analysis program. Among the total number, the cells were isolated by the intensity of cytoplasm staining (chromatophilia). After a preliminary check for the normal distribution of indicators, the data obtained were analyzed by non-parametric statistics. Results. With total cerebral ischemia, a decrease in the size of neurons and deformation of perikaryons were observed. Normochromic neurons completely disappeared at the 60th minute. The number of hyperchromic neurons increased, and then progressively decreased. Shrunken neurons made up the majority of cells in the studied cortical sections at the 30–60th minutes, and then, after 5 and 24 hours, cells with pericellular edema prevailed in the neuron population.Conclusion. The obtained data on histological changes in neurons of phylogenetically different parts of the cerebral cortex in the dynamics of total cerebral ischemia provide the basis for further detailed study of post-mortem changes of the brain as well as determining the time of death, thus creating a fundamental basis for studying the properties of neurons, including their transition from one functional state to another.


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