Endurance In Conditions Research Articles

Tolerance of Perovskite Solar Cells to Electrostatic Discharge in Martian Dust Activities.

In exploring the viability of perovskite solar cells (PSCs) for Mars missions, our study first delved into their temperature endurance in conditions mimicking the Martian climate, revealing remarkable thermal stability within the temperature range of 173-303 K. We then pioneered the examination of PSC resilience to electrostatic discharge (ESD), a critical factor given the frequent Martian dust activities. In a custom-built Martian simulation chamber, we discovered that ESD exposure dramatically reduced the power conversion efficiency of these devices by more than half (55.4%) in just 90 s. This groundbreaking research not only advances our understanding of the potential of PSCs for Mars exploration but also opens new avenues for optimizing solar technology in extreme environments.

Pre-breeding Diets in the Seahorse Hippocampus reidi: How Do They Affect Fatty Acid Profiles, Energetic Status and Histological Features in Newborn?

Seahorses (Hippocampus spp.) are exceptional marine species considering their reproductive patterns and other features. Due to the iconic characteristics of these fishes, aquarium trade, and research efforts have increased in the last years. Consequently, novel rearing techniques have been developed; however, there is a need for improvements on a series of issues, namely reproduction success enhancement. The tropical species Hippocampus reidi is the most traded seahorse but many aspects of breeding and its impact on the quality of neonates are still poorly understood. In the present study, we assessed the effects of two pre-breeding diets on newborn quality and viability considering biochemical characteristics, energetic status, and ultrastructural aspects of muscular tissue. During the whole pre-breeding season (5 months), the breeders were fed on one of the following diets: M0 (adult non-enriched Artemia) and M5 (adult non-enriched Artemia + mysidaceans). From the onset of the reproduction period, all breeders were fed for 6 months on diet M5. Breeding success and energetic status (ATP, total adenylic nucleotides, AEC, and NAD) of newborns resulted considerably enhanced in treatment M5. However, initial differences in neonates quality did not affect further newborn performance (survival and growth until day 7 after male’s pouch release) while gaining access to high-quality preys (copepods). Besides, morphological alterations in muscle tissue were not observed. The reproduction in the species followed a capital–income continuum pattern characterized by an initial mixed capital-income period (until 70–100 days since the onset of the breeding season) followed by an income breeding period with progressive exhaustion of body reserves, especially in M0-newborns. Interestingly, the effects of pre-breeding diets were also noticed in the second half of the breeding period. Our results seemed to indicate that the requirements in essential fatty acids in H. reidi are lower than in other seahorse species (e.g., Hippocampus guttulatus). Globally, the results achieved revealed that high-quality pre-breeding diets enhanced reproduction success and would likely result advantageous to improve newborn endurance in conditions of moderate starvation or sub-optimal feeding.

Выполнение домашнего задания по физической культуре студентами для повышения уровня физических качеств

The question on the need to perform homework on physical education for students in the form of additional physical activity is considered in the article. The problem of motor activity lack is studied and a solution presented in the form of certain exercises set in order to accustom the student to regular physical activity is found. The positive and negative aspects of this innovation are considered. Method of research. To confirm the theoretical assumption about the benefits of doing homework, a study that lasted for three months was conducted. The study engaged 60 students (30 young males and 30 young females) aged 17-19 years, in which they were divided equally by gender into 2 groups – control (CG) and experimental (EG). The results of the study. As a result of experiment, after doing homework for 3 months, improvements in student’s physical qualities in the experimental group could be observed. Among them: strength, endurance, flexibility, dexterity, speed and coordination of movements. It is concluded that due to physical exercises performed independently at home, the blood supply to the muscles and regulation of their activity by the nervous system improves – muscle mass increases, the immune system strengthens and, consequently, health improves, endorphins are produced in the body, so students feel better after training. Also, training the muscular system increases endurance in conditions of both physical and mental stress, thanks to an active lifestyle, the body's metabolic rate remains at a high level for long time, which prevents aging. Regular exercise makes it easier to fall asleep and improves the quality of sleep.

The generalized regularities of damageability and integrity in estimations of the endurance in conditions of variability of loading regimes

We consider and analyze general methodological issues regarding the strength and endurance (life-time) of the materials and structure elements under a combined effect of various force, deformation and temperature factors. The Journal "Zavodskaya laboratoriya. Diagnostika materialov" (Industrial laboratory. Diagnostics of materials) has launched systematic publications on this problematic since 2018. For many decades, domestic and foreign laboratory studies have gleaned to a traditional methodology for obtaining initial curves of the long-term and cyclic strength that related the breaking stresses with time or number of cycles. These curves, with the characteristic sections and break points, separating the areas of elastic and inelastic (plastic strain or creep strain) strain, are used in analysis of long-term and cyclic damage. Using the elementary linear law of damage summation, it is possible to calculate at a first approximation the strength and endurance under varying conditions of loading. Stepping up the requirements to the accuracy of calculations necessitates a transition from force fracture criteria (at stresses a) to deformation criteria (in elastic and inelastic deformations e). Thus, it becomes possible to construct and use a unified expression for the curve of the long-term cyclic fracture (taking into account the temporal x and cyclic N factors) and a long-term cyclic damage. With such approach it is possible to remain the linear law of damage summation though those damages are obviously nonlinear. The goal of the study is to continue and support the discussion of the most complex problems of a comprehensive assessment of the strength, resource, survivability and safety of high-risk engineering equipment within the journal pages.

The Organization and Content of Music Therapy Classes for the Prevention and Treatmentof Psychosomatic Diseases in Children from Six to Ten Yearsof Age

In preparing of professional field hockey players we should use the additional tools that would help to improve the abdominal type of breathing. This fact would have the positive impact to the improving of their special physicalpreparedness. The goal of the research is to identify the influence of learning and training classes with the use of the method of creating the state of hypercapnic hypoxia on specialized physical preparedness of field hockey players on the stage of the highest possible realization of individual abilities. Results of the study. 29 field hockey players aged 19–21 took part in the study. The study was conducted for 24 weeks of the first preparatory and competitive periods of yearly macro cycle. During the shaping experiment, the athletes' starting speed increased by 10 and 30 meters in 4,37 and 1,89 %, respectively, and the result of the «shuttle run 180 m» test (in 0,73 %) also improved. In hockey players on the grass of the control group, only the running time by 10 m decreased (in 3,21 %). Conclusions. It has been established that studies using the «endogenous-hypoxic breathing» technique contribute to a significant increase in the starting speed and special endurance in conditions of providing muscular work at the expense of lactate energy supply processes.

Peculiarities of the evaluation of technical-tactical readiness of qualifi ed basketball players during fatigue accumulation

In basketball, there is a problem of substantiation of integrated evaluation of technical and tactical readiness and functional support of special endurance in conditions of fatigue accumulation. It is shown that the implementation of control as a function of management in basketball players training process can be based on an evaluation of the technical and tactical readiness and cardiorespiratory system response to special work during fatigue accumulation. The effectiveness of implementation of technical and tactical actions is affected by the speed of response, and ability to maintain it in conditions of increased fatigue.

Nicotinamide-rich diet improves physical endurance by up-regulating SUR2A in the heart.

SUR2A is an ATP-binding protein that serves as a regulatory subunit of cardioprotective ATP-sensitive K+ (KATP) channels. Based on signalling pathway regulating SUR2A expression and SUR2A role in regulating numbers of fully assembled KATP channels, we have suggested that nicotinamide-rich diet could improve physical endurance by stimulating SUR2A expression. We have found that mice on nicotinamide-rich diet significantly improved physical endurance, which was associated with significant increase in expression of SUR2A. Transgenic mice with solely overexpressed SUR2A on control diet had increased physical endurance in a similar manner as the wild-type mice on nicotinamide-rich diet. The experiments focused on action membrane potential and intracellular Ca2+ concentration have demonstrated that increased SUR2A expression was associated with the activation of sarcolemmal KATP channels and steady Ca2+ levels in cardiomyocytes in response to β-adrenergic stimulation. In contrast, the same challenge in the wild-type was characterized by a lack of the channel activation and rise in intracellular Ca2+. Nicotinamide-rich diet was ineffective to increase physical endurance in mice lacking KATP channels. This study has shown that nicotinamide-rich diet improves physical endurance by increasing expression of SUR2A and that this is a sole mechanism of the nicotinamide-rich diet effect. The obtained results suggest that oral nicotinamide is a regulator of SUR2A expression and has a potential as a drug that can improve physical endurance in conditions where this effect would be desirable.