An analytical technique to find approximate solutions of nonlinear damped oscillatory systems

Combining Krylov-Bogoliubov-Mitropolskii (KBM) and harmonic balance methods, an analytical technique is presented to determine approximate solutions of nonlinear oscillatory systems with damping. The first approximate perturbation solutions in which the unperturbed solutions contain two harmonic terms agree with numerical solutions nicely even if the damping force is significant. With suitable examples it has been shown that the combination of classical KBM and harmonic balance methods sometimes fails to measure satisfactory results; but the combination of extended KBM method (by Popov) and harmonic balance method always give the desired results. The method is illustrated by several examples and the solutions are compared to some existing solutions.     

Somatic DNA Damages in Cardiovascular Autonomic Neuropathy

Cardiovascular autonomic neuropathy (CAN) is one of the most clinically significant complications of diabetes mellitus. Even though many ethological factors have been attributed for the pathogenesis of this disease no attempts were made to correlate DNA damage as a causative factor. Hence the present study was undertaken to asses the extent of somatic DNA damages by cytokinesis-block micronuclei assay (CBMN). An attempt is also being made to correlate the habits and/or risk factors and socioeconomic status with CAN. The CBMN frequency of 46 patients suffering from autonomic neuropathy was compared with that of 25 healthy age and sex matched controls. All the subjects were suffering from type 2 diabetes for at least 8 years and have varying degrees of coronary artery diseases. The mean CBMN frequency of the patients was statistically higher than that of the healthy control subjects (P < 0.05). The CBMN frequency was found to be significantly altered in CAN patients who where physical inactivity and smoking. A significant correlation could also be observed between CAN and smoking, diabetes mellitus, hypertension, dyslipidemia, abdominal obesity, and physical activity.     

Groupitizing reflects conceptual developments in math cognition and inequities in math achievement from childhood through adolescence

Understanding the cognitive processes central to mathematical development is crucial to addressing systemic inequities in math achievement. We investigate the “Groupitizing” ability in 1209 third to eighth graders (mean age at first timepoint = 10.48, 586 girls, 39.16% Asian, 28.88% Hispanic/Latino, 18.51% White), a process that captures the ability to use grouping cues to access the exact value of a set. Groupitizing improves each year from late childhood to early adolescence (d = 3.29), is a central predictor of math achievement (beta weight = .30), is linked to conceptual processes in mathematics (minimum d = 0.69), and helps explain the dynamic between the ongoing development of non-symbolic number concepts, systemic educational inequities in school associated with SES, and mathematics achievement (minimum beta weight = .11) in ways that explicit symbolic measures may miss.     

Audience support and choking under pressure: A home disadvantage?

This paper highlights the not-so-obvious but compelling reasons why the same supportive audiences that can help performers attain their highest potential also may increase performers' risk of choking under pressure. Drawing primarily from social psychology research and theory, we conclude that audience support magnifies performance pressure and induces performers to avoid failure rather than seek success during the most critical moments of performance contests. Although supportive audiences can inspire performers to excel when motivation would otherwise be lacking, audiences may also lead performers towards maladaptive self-monitoring and overcautiousness when the stakes are highest. The increased self-focus that supportive audiences induce can disrupt the automatic execution of the skills performers possess. Dispositional and situational moderators of the relationship between audience support and performance are reviewed.     

Science and medicine of rowing: A review

The biology and medicine of rowing are briefly reviewed. Effort in a 2000 -m race is about 70% aerobic. Because the boat (and in some instances a cox) must be propelled, successful competitors are very tall, with a large lean mass and aerobic power. Large hearts may lead to erroneous diagnoses of a cardiomyopathy. Large respiratory minute volumes must be developed by chest muscles that are also involved in rowing. The vital capacity is typically large, and breathing becomes entrained. Expiration cannot be slowed relative to inspiration (as normally occurs at high rates of ventilation) and the limiting flow velocity may be reached, with the potential for airway collapse. Performance is strongly related to the power output at the ‘anaerobic threshold’, and lactate measures provide a guide to an appropriate intensity of endurance training. Peak blood lactate levels are higher in males (commonly 11–19 mmol·l -1 and occasionally as high as 25 mmol·l -1) than in females (9–11 mmol·l -1), probably because males have a greater muscle mass in relation to blood volume. The skeletal muscles are predominantly slow twitch in type, developing an unusual force and power at low contraction velocities. Many rowers have a suboptimal diet, eating excessive amounts of fat. Lightweight rowers also have problems of weight cycling. Aerobic power and muscle endurance often change by 10% over the season, but such fluctuations can be largely avoided by a well-designed winter training programme. Injuries include back and knee problems, tenosynovitis of the wrist and, since the introduction of large blades, fractures of the costae.     

Biology and medicine of soccer: An update

Recent literature on the biology and medicine of soccer (primarily since 1990) has been accumulated by a combination of computer searching of relevant databases and review of the author's extensive files. From a total of 9681 papers, 540 were selected for closer scrutiny and 370 are discussed in the present review. These articles cover patterns of play and the resulting energy demands, the nutritional requirements of soccer, the anthropometric, physiological, biochemical and immunological characteristics of successful players, the influence of environmental stressors (heat, cold, hypoxia and time zone shifts), special features of female and junior competitors, selected issues in training, and the incidence and prevention of injuries. The information presented has important implications for the safety and success of soccer players; the challenge is now to ensure that this information is understood and acted upon by coaches and individual team members.     

Paraphrasing refutation text and knowledge form: examples from repairing relational database design misconceptions

Educational technology research and development - This experimental study examined the effects of conceptual change-oriented refutation text (RT) on declarative knowledge and conceptual knowledge....     

'Being in the World': The event of learning

This paper employs an eclectic mix of paradigms in order to discuss constituting characteristics of young children's learning experiences. Drawing upon a phenomenological perspective it examines learning as a form of 'Being' and as the result of learners' engagement with the world in their own, unique, intentional manners. The learners' intentions towards their world are expressed in everyday activity and participation. A social constructivist perspective is thus employed to present learning as situated in meaningful socio-cultural contexts of the everyday, lived world and as a form of participation in those settings. These characteristics of learning are brought together into a holistic, synthesised model, a Gestalt of learning. The proposed synthesis has relevance for and is applicable to educational contexts as a means of making sense of children's learning experiences and of promoting and facilitating them.     

Modularisation approaches in Initial Vocational Education: evidence for policy convergence in Europe?

One response to challenges of national vocational training systems has been a move towards greater flexibility within vocational training systems. This article focuses on an investigation of modularisation as a tool for achieving this flexibility. Many European countries have introduced modular forms into their vocational training system. We investigate whether the global trends set out are producing policy convergence in modularisation in differing countries. This study selects seven European countries to make a detailed analysis and entailed an analysis of each country’s Initial Vocational Education and Training programmes. The methodology involved both primary and secondary data collection. The findings demonstrate policy convergence that can be attributed to similar challenges at national level. Modularisation in some countries takes a ‘radical’ form. Other countries have followed a mixed approach. It is clear that no two countries have adopted the same form of modularisation, although some countries have cited common challenges in the modularisation process.     

The Perils of Blowing the Whistle: Match-Fixing in Scotland and Australia, 1920s to 2015

Abstract

Two family stories shed some light on changes in the character and causes of corruption in football in the twentieth and twenty-first centuries. My grandfather was a central figure in an alleged match-fixing episode in Association football in Scotland in the third decade of the twentieth century, while I was a peripheral figure in one in Australia in the last. I came across another one while researching the story of the Croatian soccer clubs in Victoria in the post-Second World War years. I also observed very closely an attempt to fix a series of matches by introducing a number of players into a team on behalf of overseas betting interests in the twenty-first century. Reflecting on these cases is a way of trying to understand how the forms and the drivers of match-fixing have changed in the twenty-first century. The three earlier episodes seem very old fashioned in the context of globalization, the commodification of sport, international gambling syndicates, and systematic corruption at the heart of the world game.