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Статті в журналах з теми "High-Intensity stress":
1
Mat Ludin, Arimi Fitri. "The Effects of High Intensity Progressive Resistance Training on Psychological Stress and Biochemicals Parameters." Jurnal Sains Kesihatan Malaysia 13, no. 2 (2015): 53–60. http://dx.doi.org/10.17576/jskm-2015-13(2)6.
2
Bhosle, Sanika Gajanan, Vishnu Vardhan, and Aashirwad Mahajan. "EFFECT OF HIGH INTENSITY INTERVAL TRAINING WITH THE USE OF TRAMPOLINE IN INDIVIDUALS WITH STRESS." International Journal of Physiotherapy and Research 6, no. 6 (November 1, 2018): 2899–904. http://dx.doi.org/10.16965/ijpr.2018.168.
3
Belaya, L. A., and I. M. Lavit. "Calculating stress intensity factor for high-velocity crack." Journal of Physics: Conference Series 1479 (March 2020): 012128. http://dx.doi.org/10.1088/1742-6596/1479/1/012128.
4
Meerlo, Peter, Bertrand J. Pragt, and Serge Daan. "Social stress induces high intensity sleep in rats." Neuroscience Letters 225, no. 1 (March 1997): 41–44. http://dx.doi.org/10.1016/s0304-3940(97)00180-8.
5
Xu, Qingzhong, Meihua Su, and Degang Hu. "CARDIOVASCULAR CONTROL RESPONSES IN HIGH INTENSITY EXERCISE STRESS TESTS." Revista Brasileira de Medicina do Esporte 27, no. 7 (July 2021): 678–81. http://dx.doi.org/10.1590/1517-8692202127072021_0355.
Анотація:
ABSTRACT Introduction: High intensity exercise is an important factor to achieve the best exercise effect, and is closely related to the patient's safety and rehabilitation. Objective: To investigate the effects of high intensity exercise on cardiovascular response and substance and energy metabolism. Methods: 50 male students at a university were selected. The average age of the subjects was 23 years old. Process of the experiment: Before the experiment, each subject took routine warm-up activities first, then put on the experimental equipment and began to run 100 meters. At the same time, the subjects’ heart rate, blood oxygen parameters and exercise time were recorded. After passing the finish line, a period of heart rate recording and blood oxygen parameters were continued. Results: Anaerobic metabolism was the main activity in the 100m race. The first 7s after the start of the race, there is a non-lactic acid process without oxygen metabolism, and the muscle oxygen saturation curve presents little change. Conclusions: High intensity exercise in sports training and physical exercise can lead to reduced heart rate variability. The increased incidence of various arrhythmias should be based on the actual situation of the movement of the object, and a reasonable arrangement of exercise load intensity. Level of evidence II; Therapeutic studies - investigation of treatment results.
6
Yan, Ming, Hao Chuan Li, and Lin Li. "Stress Intensity Factor of Thermal Fatigue Crack in High Temperature." Advanced Materials Research 581-582 (October 2012): 677–80. http://dx.doi.org/10.4028/www.scientific.net/amr.581-582.677.
Анотація:
Stress intensity factor of thermal fatigue crack was calculated within one cycle by using finite element method in consideration of the multi-linear kinematic hardening characteristic of a material. The affection of loading sequence to stress intensity factor was studied under circularly variational temperature by comparing to that in one cycle. The low temperature cycle can not affect the stress intensity factor of latter cycles with high temperature; but high temperature cycle can affect the stress intensity factor of latter cycles with low temperature, and make it be equal to that of the high temperature cycle.
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Araujo, Nayara Costa, Anibal Monteiro Magalhães Neto, Mahmi Fujimori, Miguel Sordi Bortolini, Allisson Benatti Justino, Adenilda Cristina Honorio-França, and Eduardo Luzía França. "Immune and Hormonal Response to High-intensity Exercise During Orienteering." International Journal of Sports Medicine 40, no. 12 (August 14, 2019): 768–73. http://dx.doi.org/10.1055/a-0970-9064.
Анотація:
AbstractOrienteering is an endurance sport that combines physical and cognitive activity, during which the athlete must complete a course with several points distributed over unknown terrain in the shortest possible time. A number of studies have investigated the body’s physiological adaptations to the stress caused during competition, but not the immunological changes. To that end, the present study evaluated the immunological, physiological and pathological responses in athletes performing high-intensity physical exercise during an orienteering race. The 30 athletes tested belonged to the elite orienteering category and participated in the regional championship. Cortisol levels were determined before and after the competition to assess stress response, as were the cytokines IL-2, IL-4, IL-6, IL-10, TNF-α, IFN-γ and IL-17 to evaluate the immune response. Cortisol levels increased after the competition, indicating a stress condition. IFN-γ, IL-6 and IL-10 levels also rose post competition. The results indicate that orienteers are exposed to high stress levels, and that this condition affects their immune and endocrine systems, triggering a predominantly anti-inflammatory response, likely an athlete’s mechanism of adaptation to the stress imposed by high-intensity physical exercise.
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Baker, Julien S., and Bruce Davies. "Evidence for Oxidative Stress Damage Following High Intensity Anaerobic Performance." Open Sports Medicine Journal 2, no. 1 (March 17, 2008): 9–13. http://dx.doi.org/10.2174/1874387000802010009.
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Dallas, J., T. Demchak, and J. Buckworth. "STRESS RESPONSE DURING HIGH INTENSITY TRAINING OF WOMEN'S COLLEGIATE CREW." Medicine & Science in Sports & Exercise 31, Supplement (May 1999): S217. http://dx.doi.org/10.1097/00005768-199905001-01011.
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Dernbach, A. R., W. M. Sherman, J. C. Simonsen, K. M. Flowers, and D. R. Lamb. "No evidence of oxidant stress during high-intensity rowing training." Journal of Applied Physiology 74, no. 5 (May 1, 1993): 2140–45. http://dx.doi.org/10.1152/jappl.1993.74.5.2140.
Анотація:
In untrained subjects, strenuous exercise provokes the appearance of oxidant stress markers in blood and muscle. On the other hand, trained muscle is resistant to oxidant stress unless exercise challenges the muscle glycogen supply. It is not known whether chronic high-intensity exercise alters the susceptibility of skeletal muscle to oxidant stress, whether there are gender-related differences in markers of oxidant stress, or whether elevating muscle glycogen stores by increasing dietary carbohydrate can minimize any exercise-related oxidant stress. To address these issues, collegiate rowers (12 men, 11 women) were randomly assigned to a moderate-(MOD, 5 g/kg body wt) or high-carbohydrate (HI, 10 g/kg) diet in a double-blind design and underwent strenuous training for 4 wk. Training in the A.M. was 40 min at 70% maximal O2 consumption (VO2); in the P.M. it was either three 2,500-m time trials (to assess power output) or aerobic and lactate tolerance training. Total daily training time was 65 min at 70% maximal VO2 and 38 min at > or = 90% maximal VO2. Thrice-weekly morning blood samples were assayed for serum creatine kinase (CK), plasma thiobarbituric acid-reactive substances (TBARS), and serum beta-glucuronidase (beta-Gluc). Weekly muscle biopsies were obtained for analysis of glycogen and, when tissue sample quantity allowed, TBARS. HI rowers produced more power and improved power more (10.7 +/- 1.0 vs. 1.6 +/- 1.6%) over the 4 wk than did the MOD rowers. Preexercise muscle glycogen concentration was maintained at 119 mmol/kg in MOD but increased 65% in HI rowers (P < 0.05).
Дисертації з теми "High-Intensity stress":
1
Chalari, Eleanna. "The effect of high-intensity intermittent exercise on biomarkers of oxidative stress." Thesis, University of Hull, 2017. http://hydra.hull.ac.uk/resources/hull:16424.
Анотація:
There are evidence that high-intensity acute exercise can promote oxidative stress. High-intensity intermittent exercise (HIIE) is a type of structured physical training characterised by repeated bouts of high-intensity exercise interspersed by recovery periods. As the impact of intermittency during acute HIIE has not been extensively studied, it is possible that the repeated intensive bouts within HIIE could induce oxidative stress levels. Plasma biomarkers, including lipid hydroperoxides and markers of DNA damage, have been increasingly applied within acute exercise physiology research to measure oxidative stress. This thesis presents the experimental outcomes of research into the effect of different forms of HIIE on established and novel biomarkers of oxidative stress. For the 1st study (chapter 3) a liquid chromatography-mass spectrometry (LCMS) method was developed and optimised to measure DNA oxidation in plasma samples. Implementing a range of progressive analytical techniques, the method developed had a sensitivity to detect 8-hydroxy-2'-deoxyguanosine (8-Oxo-dG) in human plasma samples in the range of 5 – 500 nM. The implementation of this LC-MS method along with other oxidative stress biomarkers was thereafter applied to a randomised investigation of different high-intensity intermittent exercise protocols. The 2nd (chapter 4) and 3rd (chapter 5) studies considered the effect of different forms of intermittent exercise undertaken by 9 healthy, regularly active male participants (aged 21.0 ± 3.0 years). Each intermittent exercise session was performed for a total duration of 45 minutes. Each 45 minute exercise protocol consisted of 4 minute stages of high-intensity intermittent running at a mean 75% v!O2max, followed by 1 minute of passive recovery (halt of running). The experimental protocol was specifically designed to match for average speed, duration and distance but varied in either the intermittency (chapter 4) or the acceleration/deceleration (chapter 5). The effects of different forms of intermittent exercise (high, moderate, low) or different acceleration/deceleration components (high, moderate, low) in relation to oxidative stress biomarkers were determined. Results showed the absence of significant increases in all the biomarkers examined. However, significant variation in individual oxidative stress responses was observed. Within a final study, the 8-Oxo-dG method developed was compared to a widely used ELISA method, as there are indications in the literature that ELISA may overestimate 8-Oxo-dG. Determination of 8-Oxo-dG was undertaken on blood plasma samples from 30 chronic heart failure patients (males = 23, females = 7) recruited from the Academic Cardiology department at Castle Hill hospital, Hull, UK, as previous studies have characterised the heart failure syndrome to be associated with higher levels of oxidative stress. Results showed that the LC-MS method developed found no detectable levels of 8-Oxo-dG in plasma samples whereas ELISA showed quantifiable amounts of 8-Oxo-dG. Thus, this thesis presented that the impact of intermittency or acceleration/deceleration following acute HIIE does not induce significant oxidative stress as determined by plasma and serum biomarkers, including plasma 8-Oxo-dG.
2
Fisher, Gordon Pascoe David D. "Oxidative stress and antioxidant defenses in lymphocytes following high intensity interval training." Auburn, Ala., 2009. http://hdl.handle.net/10415/2003.
3
Tofique, Muhammad Waqas. "Very high cycle fatigue of duplex stainless steels and stress intensity calculations." Licentiate thesis, Karlstads universitet, Institutionen för ingenjörsvetenskap och fysik, 2014. http://urn.kb.se/resolve?urn=urn:nbn:se:kau:diva-34591.
Анотація:
Very high cycle fatigue (VHCF) is generally considered as the domain of fatigue lifetime beyond 10 million (107) load cycles. Few examples of structural components which are subjected to 107-109 load cycles during their service life are engine parts, turbine disks, railway axles and load-carrying parts of automobiles. Therefore, the safe and reliable operation of these components depends on the knowledge of their fatigue strength and the prevalent damage/failure mechanisms. Moreover, the fatigue life of materials in the VHCF regime is controlled by the fatigue crack initiation and early growth stage of short cracks. This study was focussed on the evaluation of fatigue properties of duplex stainless steels in the VHCF regime using the ultrasonic fatigue testing equipment. The ultrasonic fatigue tests were conducted on the cold rolled duplex stainless strip steel and hot rolled duplex stainless steel grades. Two different geometries of ultrasonic fatigue test specimens were tested. Considerable attention was devoted to the evaluation of fatigue crack initiation and growth mechanisms using the high resolution scanning electron microscopy. The fatigue crack initiation was found to be surface initiated phenomena in all the tested grades, albeit different in each case. The second part of this thesis work was the development of a distributed dislocation dipole technique for the analysis of multiple straight, kinked and branched cracks in an elastic half plane. Cracks with dimensions much smaller than the overall size of the domain were considered. The main goal of the development of this technique was the evaluation of stress intensity factor at each crack tip. The comparison of results from the stress intensity factor evaluation by the developed procedure and the well-established Finite Element Method software ABAQUS showed difference of less than 1% for Jacobi polynomial expansion of sixth order in the dipole density representation.Article III was still in manuscript form at the time of the defense.
Very high cycle fatigue of stainless steels
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HASANI, NAJAFABADI SEYED HUSEIN. "Numerical-Experimental Assessment of Stress Intensity Factors in Ultrasonic Very-High-Cycle Fatigue." Doctoral thesis, Politecnico di Torino, 2018. http://hdl.handle.net/11583/2712549.
Анотація:
The continuous enhancement of reliability and durability requirements for many machinery components is significantly pushing the experimental research on the Very-High-Cycle Fatigue (VHCF) response of metallic materials. In order to significantly reduce testing time, ultrasonic testing machines are widely adopted when carrying out VHCF tests.
In the VHCF literature, the critical Stress Intensity Factor (SIF) is estimated by applying analytical SIF formulations to the typical semi-circular surface crack geometry revealed by fracture surfaces at final failure. However, when subjected to ultrasonic VHCF tests, analytical SIF formulations valid for static loading conditions could eventually lead to significant estimation errors.
The correct computation of the SIF in ultrasonic VHCF loading conditions is a key issue when investigating the crack growth rate curve with pre-cracked specimens or when evaluating critical SIF values from fracture surfaces of failed specimens. Dynamic conditions related to the resonance of the vibrating specimen, contact nonlinearity between crack faces and stress singularity at the crack tip make the SIF computation difficult and cumbersome. Numerical computation through Finite Element Models under non-linear dynamic conditions makes use of direct integration methods (implicit or explicit). However, in the high-frequency regime of ultrasonic VHCF tests, the procedure may lead to unacceptable computational time.
The present thesis aims at finding a robust, accurate, and simple method to calculate the critical SIF at final failure fracture of VHCF samples. In order to cope with the inefficiency of the time domain direct integration method, frequency domain analysis, and Multi Harmonic Balance Method were employed in this thesis. Even though the frequency domain analysis significantly reduced the computational time the overall reduction was still considered insufficient. Hence, reduction techniques via Reduce Order Modeling were also applied to decrease the total number of degrees of freedom for the system.
The solution obtained with the ABAQUS implicit solver was employed to verify the proposed hybrid technique. Results showed that the present method can accurately predict the displacement field and the SIF together with a drastic decrease of the computational time.
The proposed method was then applied to two models based on real sample geometries (Hourglass and Gaussian samples failed under ultrasonic VHCF) in order to evaluate the effect of the geometry on the critical SIF value. Results calculated by classical solutions valid for static conditions were also compared with the results obtained with the proposed hybrid method.
The comparison showed that conventional static solutions for SIFs could not be used to compute SIF values in ultrasonic conditions since computational errors are significant.
Another important finding was that, for the Gaussian sample, the SIF in both loading conditions (static and dynamic) is smaller than that for the Hourglass sample. The difference in static conditions is considerable and larger than that in dynamic conditions.
Besides the efficient and accurate computation of the critical SIF values from samples failed under ultrasonic VHCF tests, the proposed method can also be used: i) to design fatigue crack growth samples for investigating the near-threshold region with ultrasonic testing machines; ii) to accurately evaluate the SIF at the border of the relevant crack growth zones in ultrasonic VHCF (e.g., at the border of the fisheye and of the Fine Granular Area).
5
Morris, John G. "Effects of hot environmental conditions on human responses to prolonged, intermittent, high-intensity shuttle running." Thesis, Loughborough University, 1999. https://dspace.lboro.ac.uk/2134/7171.
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Long, Meghan. "Comparison of High Intensity Interval Training Versus Moderate Intensity Continuous Training in a Phase II Cardiac Rehabilitation Program." Bowling Green State University / OhioLINK, 2017. http://rave.ohiolink.edu/etdc/view?acc_num=bgsu1498769361795025.
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Dernbach, Arthur R. "Indices of oxidant stress in the blood and muscle of rowers during four weeks of high intensity twice-daily rowing training /." The Ohio State University, 1990. http://rave.ohiolink.edu/etdc/view?acc_num=osu1487682558445274.
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Hooley, Christopher Gary. "Examination of the effects of dietary protein and lipid on growth and stress response of Nile tilapia cultured in high intensity systems." Thesis, Montana State University, 2012. http://etd.lib.montana.edu/etd/2012/hooley/HooleyC0512.pdf.
Анотація:
Tilapia is the second most consumed farmed fish, after carp, and the most widely grown of any farmed fish. Significant feed price increases in recent years threaten sustainability of the industry. In the US tilapia are often subjected to extended hauling to reach live-fish markets. Therefore, the objectives of the current study were to optimize dietary protein and lipid levels for juvenile tilapia cultured in high-intensity recirculating-water system and assess how dietary changes alter hauling stress-tolerance. To achieve these objectives, a 3 X 3 factorial design was used with practical-type diets formulated to contain three levels of dietary protein (28, 32 and 36%) and three levels of dietary lipid (3, 6, and 9%). Juvenile tilapia (34.5 ± 0 .4g initial weight) were fed one of the nine diets, three feedings/d to apparent satiation, six d/wk for 12wk. Fish were weighed and counted every three weeks and feed consumed recorded weekly. At the conclusion of the feeding trial, three fish per tank were sampled for proximate composition analyses. One week post-conclusion of the feeding trial, tilapia remaining in each tank were subjected to a simulated live haul in which fish were transferred to insulated container (2lbs/gallon) with supplemental oxygen for 24h, and then returned to their source tank and allowed to recover for an additional 48h. Hematocrit, glucose, lactate and cortisol measurements were collected at time 0, 24h, and 72h. Increasing dietary protein significantly improved tilapia weight gain (P=0.01), feed conversion (FCR, P=0.03), feed intake (P=0.02), protein retention (P=0.01) and filet ratio (P=0.01). Increasing dietary lipid also significantly improved weight gain (P=0.05) and FCR (P=0.01) but at 9% decreased feed intake (P=0.02). Blood chemistry values were also altered by dietary protein and lipid levels (Figure 1). No significant interactions between dietary protein and lipid levels on growth performance or blood chemistry values were measured. Results of this study suggest that while increasing protein and lipid levels in tilapia diet formulations improved production of tilapia cultured in high intensity systems and that, stress tolerance during live hauls appeared to be reduced.
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Lindberg, Felicia, and Rytterborg Julia Fex. "Anti-stressträning : En kvantitativ tvärsnittsstudie." Thesis, Gymnastik- och idrottshögskolan, GIH, Institutionen för idrotts- och hälsovetenskap, 2019. http://urn.kb.se/resolve?urn=urn:nbn:se:gih:diva-5682.
Анотація:
Syfte och frågeställningar: Syftet är att studera om träning på olika intensitetsnivåer påverkar upplevd stress hos kvinnor i Sverige. Denna studie kommer svara på dessa frågeställningar: - Finns det någon skillnad i upplevd stress hos kvinnor som deltar på lågintensiv träning i form av promenader jämfört med kvinnor som deltar på högintensiv träning i form av löpning? Finns det någon skillnad i upplevd stress hos kvinnor som deltar på högintensiv träning i form av löpning jämfört med kvinnor som inte tränar alls? Finns det någon skillnad i upplevd stress hos kvinnor som deltar på lågintensiv träning i form av promenader jämfört med kvinnor som inte tränar alls? Metod: Studien är en tvärsnittsstudie, genom enkätundersökningar har skillnader i upplevd stress jämförts på kvinnor med medelålder 39,03 år ( ± 14,44), som antingen tränat högintensivt eller lågintensivt. Resultaten har jämförts med en referensgrupp bestående av kvinnor som inte tränar alls. Perceived Stress Scale-10 (PSS10) inklusive tio stycken intensitets-frågor för inklusion i studien skickades ut via sociala medier, Facebook. Resultat: En signifikant skillnad sågs vid jämförandet av kvinnor som tränar högintensivt och referensgrupp, (p=0,001), poängmässig skillnad i PSS10; 7,67 poäng. Ingen signifikant skillnad redovisades mellan högintensiv och lågintensiv grupp (p=0,737), detsamma gällde lågintensiv och referensgrupp (p=0,081). Slutsats: Högintensiva kvinnor hade reducerad upplevd stress jämfört med kvinnor som inte tränade alls. Ingen skillnad i upplevd stress kunde urskiljas mellan kvinnor som tränar lågintensivt och kvinnor som tränade högintensivt. Samma gällde kvinnor som tränade på låg intensitet jämfört med kvinnor som inte tränade alls, ingen skillnad i upplevd stress.
Purpose and aims: The aim is to study if different exercise-intensities affects perceived stress in Swedish women. This study will answer the following questions:
- Is there a difference in perceived stress in women who participate in low-intensity exercise in the form of walking compared to women who participate in high-intensity exercise in the form of running? Is there a difference in perceived stress in women who participate in high-intensity exercise in the form of running compared to women who do not exercise at all? Is there a difference in perceived stress in women who participate in low-intensity exercise in the form walking compared to women who do not exercise at all? Method: The study is a cross-sectional study, through questionnaires, differences in perceived stress have been compared in women with a mean age of 39,03 years (± 14,44), who either exercised with high intensity or with low intensity. The results have been compared to a reference group consisting of non-training women. Perceived Stress Scale-10 (PSS10) together with ten intensity-questions for inclusion in the study was sent out via social media, Facebook. Results: A significant difference was detected in the comparison of the high intensity group and the reference group, (p=0.001), score difference in PSS10; 7,67 points. No significant difference between the high-intensity group and the low-intensity group (p=0.737), the same applied to the low-intensity group and the reference group (p=0,081). Conclusions: Women who participated in high intensity exercise had reduced percieved stress compared to women who did not exercise at all. No difference in percieved stress was observed between women who participated in low intensity exercise and women who participated in high intensity exercise. Similarly, no difference in percieved stress in women who participated in low intensity exercise and women who did not exercise at all.
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Pugliese, L. "EFFECTS OF TRAINING REGIMES AT DIFFERENT INTENSITIES ON PERFORMANCE AND OXIDATIVE STRESS IN MASTERS ATHLETES." Doctoral thesis, Università degli Studi di Milano, 2015. http://hdl.handle.net/2434/258143.
Анотація:
Over the last decade, the participation of middle-aged and older (‘masters’) involved in sport activities at different levels has significantly increased, particularly in long-distance events. Master athletes are typically characterized as people who continue physical training throughout life and in this population, the incidence and risk of chronic and age-related diseases are reportedly lower, and self-rated health is better than in apparently healthy controls. However, regardless of training a decline in peak athletic performance in both endurance and sprint events and for all competitions/disciplines usually occurs with aging. In particular, declines in endurance exercise performance and its physiological determinants with ageing appear to be mediated in large part by a reduction in the exercise training ‘stimulus’, mainly as a result of increased work and family commitments, few masters still follow structured training programs, and the increased prevalence of exercise training-associated injuries that probably contributes to their reduced training intensity and volume. Furthermore, aging is accompanied by a progressive increase in free radical production (i.e., synthesis of reactive oxygen species) with a concomitant decrease in the enzymatic defence mechanisms, promoting the development of oxidative stress. The chronic repetition of exercise, i.e. exercise training, may have the capability to develop a compensation to oxidative stress in skeletal muscle fibres by means of an adaptation of the antioxidant and repair systems. This might result in a decreased resting level of oxidative damage and an increased resistance to oxidative stress.
In general, the main types of training used to improve endurance exercise performance are: i) continuous training at moderate intensity (CON); and ii) discontinuous training at high intensity (DHIT). Different studies showed that even in sedentary or moderately trained individuals, DHIT might be an efficient strategy to induce adaptations in skeletal muscle and exercise performance that are comparable with conventional endurance training. The first part of the thesis is focus on master runners. First study aims to evaluate if an individualized training schedules characterized by an overall reduction of training volume is able to improve running performance. Moreover, the impact of CON and DHIT training programs on running performance and its main physiological factors in master runners has been evaluated. The second study aims to evaluate the effects of 8-week of DHIT and CON on resting level and time-course changes of several indexes of oxidative stress. The main findings of these studies show that despite a significant reduction of training volume, CON and DHIT, characterized by the same total volume, improve running economy and running performance. Furthermore, both CON and DHIT induced similar beneficial effects, reducing the resting levels of oxidative stress biomarkers in plasma and urine. The second part of the thesis is focused on master swimmers. The third study aims to compare the effects of two opposite training protocols (low-volume high-intensity vs high-volume low-intensity) in a group of trained master swimmers. The fourth study aims to examine the effects of low-volume high-intensity training on ROS production and on antioxidant capacity in master swimmers by applying electron paramagnetic resonance measurement. The results indicate that in master swimmers an increase of training volume may lead to an improvement of indexes of aerobic capacity and middle-long distance performance. A subsequent period of high-intensity low-volume training, besides maintaining previous improvements, may positively affect also short distance performance. Moreover, high intensity training improves antioxidant capacity and significantly decreases baseline ROS production.
Книги з теми "High-Intensity stress":
1
Association, National Electrical Manufacturers. American national standard for roadway and area lighting equipment--plug-in type receptacle and plug for high-intensity discharge ignitors. Rosslyn, VA?]: Global Engineering Documents, 2005.
2
Macleod, D. A. D., and Ron J. Maughan. Intermittent High Intensity Exercise: Preparation, Stress and Damage Limitation. E & FN Spon, 1993.
3
McCall, Pete. Ageless Intensity. Human Kinetics, 2022. http://dx.doi.org/10.5040/9781718224957.
Анотація:
High-intensity training has no age restriction, so why slow down? You don’t have to. However, there is a better way to train … one that reduces stress on your body, decreases risk of injury, and maximizes the results you’re looking for. Ageless Intensity is a straightforward science-based guide on how to structure and implement high-intensity workouts to increase strength and power, add lean muscle mass, improve mobility, burn fat, reduce heart rate, and, ultimately, reduce the biological effects of time. Inside, you will discover not only the impact aging has on your body but also how high-intensity exercise actually slows that process. You’ll learn the importance of adding challenging strength and mobility exercises to your routine as well as how to monitor and adjust recovery between workouts. You’ll even find predesigned workouts that can be used as is or be customized to increase the intensity and push your body to its limits. So, if you’re not ready to slow down, Ageless Intensity will show you how to keep going strong.
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Brown, Nina W. Uptight and In Your Face. ABC-CLIO, LLC, 2010. http://dx.doi.org/10.5040/9798216031017.
Анотація:
Dealing with uptight, high-stress people in your workplace, family, or home can be an enormous challenge, but this book provides invaluable insight and practical advice enabling readers to handle these "problem" personality types successfully. It is often stated that communication is the most important aspect of creating an effective relationship or achieving goals when working with another individual or within a team. But how does one communicate with someone who is too intense, anxious, or self-absorbed to hear anything you're trying to say? In Uptight and In Your Face: Coping with an Anxious Boss, Parent, Spouse, or Lover the author presents an invaluable tutorial to successfully interact with the most frustrating and taxing people in your life. This text examines the five most common types of uptight people to illustrate how the underlying patterns of intensity, anxiety, and self-absorption are displayed. Considerable attention is given to help readers understand how they may be contributing to their own distress. The final chapters present numerous coping and self-development strategies that will help reduce or eliminate many of the detrimental effects of interacting with high-stress people. Descriptions of complex psychological concepts are explained in everyday language.
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Armstrong, Neil, and Willem van Mechelen, eds. Oxford Textbook of Children's Sport and Exercise Medicine. Oxford University Press, 2017. http://dx.doi.org/10.1093/med/9780198757672.001.0001.
Анотація:
Comprehensive and up to date, this textbook on children’s sport and exercise medicine features research and practical experience of internationally recognized scientists and clinicians that informs and challenges readers. Four sections—Exercise Science, Exercise Medicine, Sport Science, and Sport Medicine—provide a critical, balanced, and thorough examination of each subject, and each chapter provides cross-references, bulleted summaries, and extensive reference lists. Exercise Science covers growth, biological maturation and development, and examines physiological responses to exercise in relation to chronological age, biological maturation, and sex. It analyses kinetic responses at exercise onset, scrutinizes responses to exercise during thermal stress, and evaluates how the sensations arising from exercise are detected and interpreted during youth. Exercise Medicine explores physical activity and fitness and critically reviews their role in young people’s health. It discusses assessment, promotion, and genetics of physical activity, and physical activity in relation to cardiovascular health, bone health, health behaviours, diabetes, asthma, congenital conditions, and physical/mental disability. Sport Science analyses youth sport, identifies challenges facing the young athlete, and discusses the physiological monitoring of the elite young athlete. It explores molecular exercise physiology and the potential role of genetics. It examines the evidence underpinning aerobic, high-intensity, resistance, speed, and agility training programmes, as well as effects of intensive or over-training during growth and maturation. Sport Medicine reviews the epidemiology, prevention, diagnosis, and management of injuries in physical education, contact sports, and non-contact sports. It also covers disordered eating, eating disorders, dietary supplementation, performance-enhancing drugs, and the protection of young athletes.
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Krasnopolskaia, Iuliia. Design and Parametric Modeling of Pretensioned and Stiffened Membranes Project Work. Technische Universität Dresden, 2021. http://dx.doi.org/10.25368/2022.407.
Анотація:
This research aimed to develop conceptually the pretensioned and stiffened membrane structures, using an experimental approach and computer simulation. The physical method of form finding included the pretensioned fabric with the glued grid made of the wooden sticks. Relaxation of the stressed membrane contributed to forming the specific anticlastic hyparic surface by energy release. The influence of the rigid elements pattern, intensity and direction of pretensioning on the final shape was investigated. The tensegrity structures were also built applying the same form finding way. These experiments led to the modelling of resulting samples with parametric design tools, namely Rhino and Grasshopper. Optimization of the final shape was carried out by changing parameters such as stiffenings configuration and membrane strength. This digital approach demonstrated successful simulation and rationalization of considered structures. Moreover, the final models can be used for further structural analysis and BIM. Considered membrane structures have very efficient load-bearing behavior. They are characterized by small weight, high light transmission and the ability to create large usable spaces free from columns. The most dangerous loads for membrane structures are wind and ponding. In practice, PTFE coated glass-fibre fabric and PVC coated polyester fabric are most suitable for pretensioned and stiffened membrane structures. The role of stiff elements can be played by steel profiles or metal tubes. The average time for the construction of a membrane structure is 6-15 months. Resulted pretensioned and stiffened membrane structures can be used as pavilions, roofs and awnings. They are distinguished by spectacular architectural view and very effective structural system. In addition, membrane tensile structures are characterized by high eco-efficiency and sustainability compared to other types of construction.
7
Wojewodzic, Tomasz. Procesy dywestycji i dezagraryzacji w rolnictwie o rozdrobnionej strukturze agrarnej. Publishing House of the University of Agriculture in Krakow, 2017. http://dx.doi.org/10.15576/978-83-66602-31-1.
Анотація:
The turn of the 20th and 21st centuries has been a very dynamic period of change in Poland and around the world; also a period of change in thinking about the economy and agriculture. The present work is a study of the decline, divestments and development of agriculture in the areas of fragmented farming structure. The reflections presented herein, upon the processes of the remodelling of agrarian structures, of divestments in farming, and disagrarisation, are mostly anchored in the achievements of the theory of spatial economy (land management), and the microeconomic theories of choice, including the theory of an agricultural holding (farm) and land rent theories. The work focuses on the economic issues of remodelling the agrarian structure, but due to the nature of the issues discussed herein, specifically in relation to family-owned farms, the social and environmental aspects also needed to be taken into account – in response to the need for a heterogeneous approach, which is increasingly stressed in economic sciences today. The main objective of the research was to diagnose and assess the scale and scope of the mechanisms and processes that inform the decline and growth of agricultural holdings in the areas with fragmented farming structure. The study covered the area comprising four regions (provinces) of south-eastern Poland, which – according to the FADN nomenclature – form the macro region of Małopolska and Pogórze. The study of subject literature has been enriched with an analysis of available statistics; data from the Farm Accountancy Data Network (FADN); information obtained from the Department of Programming and Reporting at the Agency for Restructuring and Modernisation of Agriculture; and author’s own research conducted among farm owners. The information thus obtained made it possible to: • Determine the theoretical premises for the spatial diversity of agriculture, and the role of small farms in the shaping of agrarian structure. • Adapt the concept of “divestment” for the description and analysis of the phenomena occurring in agriculture. • Indicate the role and importance of the processes of divestment and disagrarisation in the restructuring of agriculture. • Assess the natural, social and economic determinants of the process of restructuring agriculture in areas with fragmented farming structure. • Assess selected aspects of economic efficiency of agriculture in areas with fragmented farming structure, with the focus on small and micro farms. • Carry out an ex ante evaluation of the impact of agricultural policy instruments on the process of restructuring of agriculture in the macro region of Małopolska and Pogórze. • Identify the indicators of decline and fall, and barriers to the liquidation of farms. • Assess the relationship between the level of socio-economic development, the structure of farming, and the quality of agricultural production space in a given territorial unit, versus the intensity of the economic and production disagrarisation processes in agricultural holdings. • Propose targeted solutions conducive to the improvement of the farming structure in areas with a high framentation of agriculture. Observation of the processes occurring in agriculture, and the scientific theories created on the basis thereof, have shown that even the smallest farms have a chance to continue in existence, provided that we are able to positively verify their adaptation to the changing conditions in the environment. Carrying out farming activity is a prerequisite for implementing the economic, social and environmental functions associated with family farms. At the same time, based on the analyses performed, we need to assume that the advanced processes of the production and economic disagrarisation of agricultural holdings are to a greater extent determined by the anatomical features of agriculture, and by the natural conditions, than by the level of socio-economic development of the given territorial unit. In the current economic climate, the remodelling of the agrarian structure is only possible with the active participation of the institutions responsible for the creation of economic growth and agricultural policy development. It is extremely important from the point of view of environmental protection, and the viability of rural areas, to support small farms engaged in agricultural activities, and to introduce such instruments that will enable the replacement of an economic collapse with divestments, carried out in a planned manner, and allowing for thus released agricultural resources to find alternative application in units with a higher development potential. The area of theoretical research requiring further exploration includes the issues such as transactional costs of the liquidation of agricultural holdings, and the assessment of the economic effectiveness of conducting divestments.
Частини книг з теми "High-Intensity stress":
1
Holdsworth, Stuart R., and Zhen Chen. "High-R Fatigue Crack Growth Threshold Stress Intensity Factors at High Temperatures." In Advances in Structural Integrity, 1–11. Singapore: Springer Singapore, 2017. http://dx.doi.org/10.1007/978-981-10-7197-3_1.
2
Bo, Xiaoli. "Experimental Study on the Impact of Thermal Stress on Aircraft Structural Performance." In Lecture Notes in Mechanical Engineering, 1259–69. Singapore: Springer Nature Singapore, 2024. http://dx.doi.org/10.1007/978-981-97-1876-4_101.
Анотація:
AbstractThe local heat source of a civil aircraft affects the temperature of the lower panel structure of the center wing. In this paper, a local heat source is arranged on the lower panel structure of the center wing. The strain of the center wing lower panel skin under different temperature gradients under local thermal loads and the corresponding temperature gradients around the heat source were investigated. The natural mesh model and the fine finite element model were used to analyze the thermal load of the center wing lower panel. The temperature on the node was applied according to the real temperature in the test, and the analysis results were compared with the test values. After comparative analysis, the strain value of the natural mesh model has a high degree of fit with the test value, and the analysis results of the natural mesh model can be used to analyze the thermal stress intensity of the center wing lower panel.
3
Sasaki, Syuutei, and Tsutomu Ezumie. "A Study of Comparison on the Stress Intensity Factor of a High Polymer Material with Cracks, Holes and Inclusions." In Key Engineering Materials, 2146–51. Stafa: Trans Tech Publications Ltd., 2005. http://dx.doi.org/10.4028/0-87849-978-4.2146.
4
Xie, Caibo, Songhan Nie, Yiqi Tao, and Zhanpeng Lu. "Correlating IASCC Growth Rate Data to Some Key Parameters for Austenitic Stainless Steels in High Temperature Water." In Springer Proceedings in Physics, 1060–72. Singapore: Springer Nature Singapore, 2023. http://dx.doi.org/10.1007/978-981-99-1023-6_89.
Анотація:
AbstractAustenitic stainless steels have been widely used for fabricating reactor core-internal components in PWRs due to its high strength, ductility and fracture toughness. The accelerated failure or degradation of austenitic stainless steel represented by IASCC has become one of the key problems affecting the safe and efficient operation of reaction core-internal in PWR nuclear power plants. IASCC is generally divided into three stages: crack initiation, crack propagation and instable fracture. Among the three stages, the crack initiation stage would occupy the major service time, the crack growth stage is featured by quasi-steady crack propagation at a certain rate, and the instable fracture stage should be avoided. Stress intensity factor K at the crack tip is often used to represent the mechanical driving force for SCC as well as IASCC.In this paper, SCC crack growth rate (CGR) data of austenitic stainless steels irradiated in high temperature water were compiled and reanalyzed to evaluate the influence of key parameters such as radiation dose and mechanical properties on IASCC sensitivity and crack growth rate of these materials in PWR nuclear power plant environment. The CGR-K curves of the irradiated materials were also analyzed. The effects of low, medium and high doses of neutron irradiation are compared, and the analysis process is illustrated with examples. In the research process, abnormal CGR and K of materials under a specific irradiation dose was found, so this phenomenon was analyzed. The CGR data and irradiation dose of austenitic stainless steel in different K range were analyzed. And proposed a way to judge the type of change:type I, type II and type III. Finally, the yield strength of the material under the same irradiation dose was found, and combined with other research data, it was further demonstrated that the neutron irradiation dose had a significant effect on the crack growth rate.
5
Manandhar, Satish, Seong-Nam Kim, and Dong-Soo Kim. "LEAP-ASIA-2019 Centrifuge Test at KAIST." In Model Tests and Numerical Simulations of Liquefaction and Lateral Spreading II, 209–37. Cham: Springer International Publishing, 2024. http://dx.doi.org/10.1007/978-3-031-48821-4_9.
Анотація:
AbstractSince Niigata and Alaska earthquakes in 1964, the dangers of liquefaction are well established, and research into liquefaction has been actively performed. In this context, Liquefaction Experiments and Analysis Projects (LEAP) was launched to provide high-quality experimental data on soil liquefaction using laboratory testing and centrifuge modeling and then validating numerical models to improve predictions. The purpose of LEAP-ASIA-2019, which is one of the LEAP programs, was to fill the gaps and further extend/establish/confirm the trends obtained in the previous LEAP-UCD-2017 program. Further, the validity of the generalized scaling law was also tested for liquefaction simulation using different 1-g and centrifuge scaling factors. During LEAP-ASIA-2019, KAIST performed two model tests (Model A and Model B) with the same target relative density (Dr = 85%) and input motion intensity of 0.3g. Models A and B were identical in construction but were tested under different centrifugal accelerations to verify the generalized scaling factors. This paper describes the experimental procedure in detail and the responses of dense model grounds to strong base shaking in terms of ground accelerations, excess pore pressure, surface displacements, stress-strain behavior, and CPT profiles. Further, discussion on the generalized scaling law and the effect of shaking history on the model behavior are also presented.
6
Ren, Xudong. "Influence of LSP on Stress Intensity Factor of Hole-Edge Crack." In Laser Shocking Nano-Crystallization and High-Temperature Modification Technology, 79–121. Berlin, Heidelberg: Springer Berlin Heidelberg, 2015. http://dx.doi.org/10.1007/978-3-662-46444-1_4.
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Homma, H., and K. Minagawa. "Measurement of Dynamic Stress Intensity History for a Crack Loaded by Impact." In Macro- and Micro-Mechanics of High Velocity Deformation and Fracture, 305–15. Berlin, Heidelberg: Springer Berlin Heidelberg, 1987. http://dx.doi.org/10.1007/978-3-642-82767-9_25.
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Asai, Masahito, Motosumi Yamanouchi, Ayumu Inasawa, and Yasufumi Konishi. "Breakdown of Low-Speed Streaks under High-Intensity Background Turbulence." In Seventh IUTAM Symposium on Laminar-Turbulent Transition, 81–86. Dordrecht: Springer Netherlands, 2009. http://dx.doi.org/10.1007/978-90-481-3723-7_11.
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Yokobori, A. Toshimitsu, Takeo Yokobori, and Hiroshi Nishi. "Stress Rate and Grain Size Dependence of Dynamic Stress Intensity Factor by Dynamical Piling-up of Dislocations Emitted." In Macro- and Micro-Mechanics of High Velocity Deformation and Fracture, 149–64. Berlin, Heidelberg: Springer Berlin Heidelberg, 1987. http://dx.doi.org/10.1007/978-3-642-82767-9_12.
10
Wang, Junqiang, Guanmei Niu, Zhongyu Yang, Hailong Cao, and Cheng Liu. "Influence of Cooling Intensity Difference Between Upper and Lower Surface to the Residual Stress Distribution of 7050 Aluminum Alloy Plates." In High Performance Structural Materials, 221–33. Singapore: Springer Singapore, 2018. http://dx.doi.org/10.1007/978-981-13-0104-9_24.
Тези доповідей конференцій з теми "High-Intensity stress":
1
Pérez, Valentín, Ignacio Antón, Rebeca Herrero, Eduardo Nogueira, Rubén Núñez, Carlos del Cañizo, and Gabriel Sala. "Induced thermo-mechanical stress in CPV receivers with cycled high intensity light." In 3RD INTERNATIONAL CONFERENCE ON THEORETICAL AND APPLIED PHYSICS 2013 (ICTAP 2013). AIP Publishing LLC, 2014. http://dx.doi.org/10.1063/1.4897073.
2
Brinez de Leon, Juan Carlos, Alejandro Restrepo Martinez, and John W. Branch Bedoya. "High stress concentration analysis using RGB intensity changes in dynamic photoelasticity videos." In 2016 XXI Symposium on Signal Processing, Images and Artificial Vision (STSIVA). IEEE, 2016. http://dx.doi.org/10.1109/stsiva.2016.7743324.
3
Düx, D., J. Glandorf, B. Hensen, and M. Düx. "Feasibility of MR-guided high intensity focused ultrasound treatment of tibial stress syndrome." In RÖKO 2023. Georg Thieme Verlag, 2023. http://dx.doi.org/10.1055/s-0043-1763181.
4
Caria, Alessandro, Carlo De Santi, Marco Nicoletto, Matteo Buffolo, Xuanqi Huang, Houqiang Fu, Hong Chen, et al. "GaN-based solar cells degradation kinetics investigated at high temperature under high-intensity 405nm optical stress." In Gallium Nitride Materials and Devices XVII, edited by Hadis Morkoç, Hiroshi Fujioka, and Ulrich T. Schwarz. SPIE, 2022. http://dx.doi.org/10.1117/12.2608680.
5
Li, Yinsheng, Hiroto Itoh, Kunio Hasegawa, Steven X. Xu, and Douglas A. Scarth. "Weight Function Method With Segment-Wise Polynomial Interpolation to Calculate Stress Intensity Factors for Complicated Stress Distributions." In ASME 2012 Pressure Vessels and Piping Conference. American Society of Mechanical Engineers, 2012. http://dx.doi.org/10.1115/pvp2012-78719.
Анотація:
Many solutions of the stress intensity factor have been proposed in recent years. However, most of them take only third or fourth-order polynomial stress distributions into account. For complicated stress distributions which are difficult to be represented as third or fourth-order polynomial equations over the stress distribution area such as residual stress distributions or thermal stress distributions in dissimilar materials, it is important to further improve the accuracy of the stress intensity factor. In this study, a weight function method with segment-wise polynomial interpolation is proposed to calculate solutions of the stress intensity factor for complicated stress distributions. By using this method, solutions of the stress intensity factor can be obtained without employing finite element analysis or difficult calculations. It is therefore easy to use in engineering applications. In this method, the stress distribution area is firstly divided into several segments and the stress distribution in each segment is curve fitted to segment-wise polynomial equation. The stress intensity factor is then calculated based on the weight function method and the fitted stress distribution in each segment. Some example solutions for both infinite length cracks and semi-elliptical cracks are compared with the results from finite element analysis. In conclusion, it is confirmed that this method is applicable with high accuracy to the calculation of the stress intensity factor taking actual complicated stress distributions into consideration.
6
Puspitosari, Aniek, and Dinna Fitriani Wardani. "EFFECT OF HIGH-INTENSITY INTERVAL CARDIO TRAINING ON STRESS LEVEL OF STUDENTS DURING COVID-19 PANDEMIC." In The 8th International Conference on Public Health 2021. Masters Program in Public Health, Universitas Sebelas Maret, 2021. http://dx.doi.org/10.26911/ab.medicine.icph.08.2021.33.
7
Evans, William M. E., and G. L. Wire. "Results of High Stress Ratio and Low Stress Intensity on Fatigue Crack Growth Rates for 304 Stainless Steel in 288°C Water." In ASME 2002 Pressure Vessels and Piping Conference. ASMEDC, 2002. http://dx.doi.org/10.1115/pvp2002-1226.
Анотація:
Fatigue crack growth rate tests were performed on a 304 stainless steel compact tension (CT) specimen in water with 40–60 cc/kg H2. Data in the literature for CT tests show minor environmental effects in hydrogenated water, but higher effects in oxygenated water. However, the PWR data presented by Bernard, et al (1979) were taken at low stress ratios (R = 0.05) and high stress intensity levels (ΔK = 16–41 MPa√m). The purpose of these tests is to explore the crack growth rate characteristics of 304 SS in hydrogenated water at higher R values (0.7 and 0.83) and lower ΔK values (11.0 and 7.7 MPa√m) Each set of R, ΔK conditions were tested at frequencies of 0.1, 0.01 and 0.001 Hz. The results show a pronounced effect on crack growth rates when compared to available literature data on air rates.
8
Takanashi, Masahiro, Yu Itabashi, and Takashi Hirano. "Study on Validity of Stress Intensity Factor in CT Specimen for Materials With Low Yield Stress." In ASME 2013 Pressure Vessels and Piping Conference. American Society of Mechanical Engineers, 2013. http://dx.doi.org/10.1115/pvp2013-97953.
Анотація:
This paper discusses the validity of a stress intensity factor K for compact tension (CT) specimens of stainless and low-alloy steels by computing J-integral values. In fracture mechanics testing, specimen configurations and loading conditions are strictly regulated to meet the small-scale yielding (SSY) condition and obtain valid data. For some materials, particularly those without an obvious yield point, it is hard to meet the SSY condition. The regulations specified in fracture mechanics test standards are based on experimental results. The theoretical reason for the SSY condition is not necessarily clear and the condition seems conservative. This study focuses on a correlation with the stress intensity factors K and the J-integral values under the SSY condition. J-integral values of CT specimens were analyzed by elasto-plastic finite element analysis. Subsequently, the validity of the stress intensity factor K was checked by comparing K and J–integral values to determine whether CT specimens were under the SSY condition or not. To simplify the comparison, J-integral values were converted to K values, equivalent stress intensity factor KJ values. When K values were low enough to meet the SYY condition of the specimen, they equaled KJ values. Meanwhile, KJ values exceed K values in a high K region, which means the specimen is no longer under a SSY condition. It is possible to determine whether the specimen is under the SSY condition or not by comparing the values of KJ and K. This paper evaluated the validity of K values using the correlative relationship and showed that they were valid to some extent even if loading conditions and specimen configurations were outside the scope of the specification by the test standards. The validity of K values with 0.2% offset strength or flow strength instead of yield stress is also confirmed by this method.
9
Townsend, Dennis P. "Improvement in Surface Fatigue Life of Hardened Gears by High-Intensity Shot Peening." In ASME 1992 Design Technical Conferences. American Society of Mechanical Engineers, 1992. http://dx.doi.org/10.1115/detc1992-0082.
Анотація:
Abstract Two groups of carburized, hardened, and ground spur gears that were manufactured from the same heat of vacuum-induction-melted vacuum-are-remelted (VIM-VAR) AISI 9310 steel were endurance tested for surface fatigue. Both groups were manufactured with a standard ground 16-rms surface finish. One group was subjected to a shot-peening intensity of 7 to 9A, and the second group was subjected to a shot-peening intensity of 15 to 17A. All gears were honed after shot peening to a surface finish of 16 rms. The gear pitch diameter was 8.89 cm (3.5 in.). Test conditions were a maximum Hertz stress of 1.71 GPa (248 ksi), a gear temperature of 350 K (170 °F), and a speed of 10 000 rpm. The lubricant used for the tests was a synthetic paraffinic oil with an additive package. The following results were obtained: The 10-percent surface fatigue (pitting) life of the high-intensity (15 to 17A) shot-peened gears was 2.15 times that of the medium-intensity (7 to 9A) shot-peened gears, the same as that calculated from measured residual stress at a depth of 127 μm (5 mil). The measured residual stress for the high-intensity-shot-peened gears was 57 percent higher than that for the medium-intensity-shot-peened gears at a depth of 127 μm (5 mil) and 540 percent higher at a depth of 51 μm (2 mil).
10
Seto, Hitoshi, Masato Koshiishi, Shigeaki Tanaka, and Ryoji Obata. "Evaluation of Crack Growth Rate of Neutron Irradiated Austenitic Stainless Steels at High Stress Intensity Factor Levels." In ASME 2020 Pressure Vessels & Piping Conference. American Society of Mechanical Engineers, 2020. http://dx.doi.org/10.1115/pvp2020-21365.
Анотація:
Abstract Crack growth rates (CGRs) at high K levels (more than 30 MPa·m0.5) were obtained in simulated boiling water reactor normal water chemistry under constant K conditions for Type 316NG stainless steel irradiated up to 2.0 dpa. Valid CGRs were obtained even at high K conditions such as K ≈ 40 MPa·m0.5 although branching was observed on the fracture surface of the specimen after CGR testing. CGRs were compared with predictions by a theoretical model and a disposition curve and it was found that these predictions are applicable even to high K levels around K ≈ 40 MPa·m0.5.
Звіти організацій з теми "High-Intensity stress":
1
Dadfarnia, Mohsen, Kevin A. Nibur, Christopher W. San Marchi, Petros Sofronis, Brian P. Somerday, James W. ,. III Foulk, and Gary A. Hayden. Measurement and interpretation of threshold stress intensity factors for steels in high-pressure hydrogen gas. Office of Scientific and Technical Information (OSTI), July 2010. http://dx.doi.org/10.2172/993303.
2
Leis. L51838 Cyclic Stress Strain Behavior and SCC Susceptibility of Line Pipe Steels. Chantilly, Virginia: Pipeline Research Council International, Inc. (PRCI), March 2001. http://dx.doi.org/10.55274/r0010355.
Анотація:
This report presents results of a preliminary evaluation of a mechanical property that has the potential to correlate with susceptibility to Stress-corrosion cracking (SCC). This mechanical property measures the evolution of the microplastic response of line pipe steels, which underlies high pH SCC, and is believed by many to be essential for near-neutral SCC. If such a property can be proven to reflect susceptibility to SCC, operators could better contain maintenance costs and specify steels for new pipelines that are inherently resistant to SCC. Limited experimentation using X60 line-pipe steel indicated that the onset, duration, and intensity of microplasticity correlated with electrochemical indicators of SCC for the high-pH cracking environment. These results show sensitivity sufficient to detect the incidence and magnitude of plastic strain that evolves in load-controlled cycling under conditions typical of pipeline service, as well as in histories where such behavior has been exhausted by prior strain hardening. Thus, these data indicate that the protocol evaluated herein is potentially capable of identifying susceptible steels, and has sensitivity of the order needed to discriminate susceptibility between steels. Benefit: While the concept and related experimental techniques hold promise as a screening tool for susceptibility, some experimental issues must be resolved before its use can be conclusively established. These and other related aspects are outlined in the discussion section, and the recommendations section of the report.
3
Christopher, David A., and Avihai Danon. Plant Adaptation to Light Stress: Genetic Regulatory Mechanisms. United States Department of Agriculture, May 2004. http://dx.doi.org/10.32747/2004.7586534.bard.
Анотація:
Original Objectives: 1. Purify and biochemically characterize RB60 orthologs in higher plant chloroplasts; 2. Clone the gene(s) encoding plant RB60 orthologs and determine their structure and expression; 3. Manipulate the expression of RB60; 4. Assay the effects of altered RB60 expression on thylakoid biogenesis and photosynthetic function in plants exposed to different light conditions. In addition, we also examined the gene structure and expression of RB60 orthologs in the non-vascular plant, Physcomitrella patens and cloned the poly(A)-binding protein orthologue (43 kDa RB47-like protein). This protein is believed to a partner that interacts with RB60 to bind to the psbA5' UTR. Thus, to obtain a comprehensive view of RB60 function requires analysis of its biochemical partners such as RB43. Background & Achievements: High levels of sunlight reduce photosynthesis in plants by damaging the photo system II reaction center (PSII) subunits, such as D1 (encoded by the chloroplast tpsbAgene). When the rate of D1 synthesis is less than the rate of photo damage, photo inhibition occurs and plant growth is decreased. Plants use light-activated translation and enhanced psbAmRNA stability to maintain D1 synthesis and replace the photo damaged 01. Despite the importance to photosynthetic capacity, these mechanisms are poorly understood in plants. One intriguing model derived from the algal chloroplast system, Chlamydomonas, implicates the role of three proteins (RB60, RB47, RB38) that bind to the psbAmRNA 5' untranslated leader (5' UTR) in the light to activate translation or enhance mRNA stability. RB60 is the key enzyme, protein D1sulfide isomerase (Pill), that regulates the psbA-RN :Binding proteins (RB's) by way of light-mediated redox potentials generated by the photosystems. However, proteins with these functions have not been described from higher plants. We provided compelling evidence for the existence of RB60, RB47 and RB38 orthologs in the vascular plant, Arabidopsis. Using gel mobility shift, Rnase protection and UV-crosslinking assays, we have shown that a dithiol redox mechanism which resembles a Pill (RB60) activity regulates the interaction of 43- and 30-kDa proteins with a thermolabile stem-loop in the 5' UTR of the psbAmRNA from Arabidopsis. We discovered, in Arabidopsis, the PD1 gene family consists of II members that differ in polypeptide length from 361 to 566 amino acids, presence of signal peptides, KDEL motifs, and the number and positions of thioredoxin domains. PD1's catalyze the reversible formation an disomerization of disulfide bonds necessary for the proper folding, assembly, activity, and secretion of numerous enzymes and structural proteins. PD1's have also evolved novel cellular redox functions, as single enzymes and as subunits of protein complexes in organelles. We provide evidence that at least one Pill is localized to the chloroplast. We have used PDI-specific polyclonal and monoclonal antisera to characterize the PD1 (55 kDa) in the chloroplast that is unevenly distributed between the stroma and pellet (containing membranes, DNA, polysomes, starch), being three-fold more abundant in the pellet phase. PD1-55 levels increase with light intensity and it assembles into a high molecular weight complex of ~230 kDa as determined on native blue gels. In vitro translation of all 11 different Pill's followed by microsomal membrane processing reactions were used to differentiate among PD1's localized in the endoplasmic reticulum or other organelles. These results will provide.1e insights into redox regulatory mechanisms involved in adaptation of the photosynthetic apparatus to light stress. Elucidating the genetic mechanisms and factors regulating chloroplast photosynthetic genes is important for developing strategies to improve photosynthetic efficiency, crop productivity and adaptation to high light environments.
4
Molotylnikova, Vira. MODERN TYPES OF BODY RELAXATION METHODS AFTER INTENSE PHYSICAL EXERTION. Intellectual Archive, November 2022. http://dx.doi.org/10.32370/iaj.2748.
Анотація:
The article presents varieties and variants of relaxation techniques advisable to use after intense physical exertion. The concept of "relaxation" and understanding of its role in physical education to maintain health and harmonious development of youth are considered. Considering the fact that one of the main trends in sports remains the increase in the intensity of training and the need to improve the results of competitions, the problem of restoring the athlete's performance capacity after physical exertion is extremely relevant today. Understanding the causes of fatigue and the physiological mechanisms of recovery, control over the relevant processes, the rational use of modern methods of body relaxation and means of recovery are important for assessing the impact of physical stress on the body, the effectiveness of training programs, identifying overtraining, determining the optimal rest time after physical exercises, and therefore, are necessary to improve the athlete's training and achieving high results.
5
Kanner, Joseph, Dennis Miller, Ido Bartov, John Kinsella, and Stella Harel. The Effect of Dietary Iron Level on Lipid Peroxidation of Muscle Food. United States Department of Agriculture, January 1995. http://dx.doi.org/10.32747/1995.7604282.bard.
Анотація:
Biological oxidations are almost exclusively metal ion-promoted reactions and in ths respect iron, being the most abundant, is the commonly involved. The effect of dietary iron levels on pork, turkey and chick muscle lipid peroxidation and various other related compounds were evaluated. Crossbred feeder pigs were fed to market weight on corn-soy rations containing either 62, 131 or 209 ppm iron. After slaughter, the muscles were dissected, cooked and stored at 4°C. Heavily fortifying swine rations with iron (>200 ppm) increase nn-heme iron (NHI), thiobarbituric acid reactive substances (TBARS), and decrease a-tocopherol in cooked stored pork but did not increase warmed-over aroma (WOA). NHI and TBARS were higher in cooked pork from pigs fed high-iron diets. Liver iron correlated with muscle iron. TBARS were strongly related with WOA. The role of dietary vitamin E and ascorbic acid on Fe-induced in vivo lipid peroxidation in swine was also evaluated. Moderate elevation in iron stores had a marked effect on oxidative stress, especially as indicated by liver TBARS. Supplemental vitamin E, and to a lesser extent vitamin C, protect against this oxidative stress. Unsupplementation of Fe in the regular diet of turkeys did not affect body weight, blood hemoglobin level, or iron pool in the liver or muscle. The reason being that it contained "natural" ~120 mg Fe/kg feed, and this amount is high enough to keep constant the pool of iron in the body, liver or muscle tissues. Only Fe-supplementation with high amounts of Fe (500 ppm) significantly increased turkey blood hemoglobin and total iron in the liver, in 1 out of 3 experiments, but only slightly affects iron pool in the muscles. It seems that the liver accumulates very high concentations of iron and significantly regulates iron concentration in skeletal muscles. For this reason, it was very difficult to decrease muscle stability in turkeys through a diet containing high levels of Fe-supplementation. It was shown that the significant increase in the amount of iron (total and "free") in the muscle by injections with Fe-dextran accelerated its lipid peroxidation rate and decreased its a-tocopherol concentration. The level and metabolism of iron in the muscles affects the intensity of in vivo lipid peroxidation. This process was found to ifluence the turnover and accumulation of a-tocopherol in turkey and chick muscles. Treatments which could significantly decrease the amount and metabolism of iron pool in muscle tissues (or other organs) may affect the rate of lipid peroxidation and the turnover of a-tocopherol. Several defense enzymes were determined and found in the turkey muscle, such as superoxide dismutase, catalase, and glutathione peroxidase. Glutathione peroxidase was more active in muscles with a high trend of lipid peroxidation, lmore so in drumsticks than in breast muscles, or muscles with a low a-tocopherol content. The activity of glutathione peroxidase increased several fold in muscle stored at 4°C. Our work demonstrated that it will be much more practical to increase the stability of muscle tissues in swine, turkeys and chickens during storage and processing by increasing the amount of vitamin E in the diet than by withdrawing iron supplementation.
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R. Davidso and H. Qin. Effects on axial momentum spread on the electron-ion two-stream instability in high-intensity ion beams. Office of Scientific and Technical Information (OSTI), June 2000. http://dx.doi.org/10.2172/756590.
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Tremblay, T., and M. Lamothe. New contributions to the ice-flow chronology in the Boothia-Lancaster Ice Stream catchment area. Natural Resources Canada/CMSS/Information Management, 2022. http://dx.doi.org/10.4095/331062.
Анотація:
Within the Boothia-Lancaster Ice Stream (BLIS) catchment area, ice flow patterns were reconstructed based on the synthesis of striation directions and cross-cutting relationships, transport patterns of erratic boulders, glacial landforms, cold-based glacial landsystems, and ice-retreat chronology. New ArcticDEM data, high-definition satellite imagery and multibeam echosounder bathymetric datasets provided increased details on ice flow indicators. Convergent high-velocity ice flows through the BLIS main axis were major, persistent features in the northeastern Laurentide Ice Sheet through the last glaciation, and this study highlights intensity fluctuations and ice flow pattern variations that occurred during that time. Highly contrasting glacial geomorphology, notably in the abundance of moraines, reflects marked differences in ice-margin retreat rates and patterns during deglaciation between the western and eastern sides of the BLIS.
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Tremblay, T., and M. Lamothe. New contributions to the ice-flow chronology in the Boothia-Lancaster ice-stream catchment area, Nunavut. Natural Resources Canada/CMSS/Information Management, 2023. http://dx.doi.org/10.4095/331424.
Анотація:
Within the Boothia-Lancaster ice stream (BLIS) catchment area, ice-flow patterns were reconstructed based on the synthesis of striation directions and crosscutting relationships, transport patterns of erratic boulders, glacial landforms, cold-based glacial landsystems, and ice-retreat chronology. New ArcticDEM data, high-definition satellite imagery, and multibeam echosounder bathymetric data sets provided increased details on ice-flow indicators. Convergent high-velocity ice flows through the BLIS main axis were major, persistent features in the northeastern Laurentide Ice Sheet through the last glaciation, and this study highlights intensity fluctuations and ice-flow pattern variations that occurred during that time. Highly contrasting glacial geomorphology, notably in the abundance of moraines, reflects marked differences in ice-margin retreat rates and patterns during deglaciation between the western and eastern sides of the BLIS.