OBJECTIVE The aim of this study was to determine the impact of a demanding work schedule involving long, cumulative work shifts on response time and balance-related performance outcomes and to evaluate the prevalence of musculoskeletal disorders between day and night shift working nurses. METHODS A questionnaire was used to identify the prevalence of past (12-month) and current (7-day) muscul...

OBJECTIVE Our purpose was to explore maternal actigraphically measured sleep, subjective sleep reports, and daytime functioning on the basis of current feeding method status during postpartum weeks 2 through 12. METHODS Objectively measured total sleep time, sleep efficiency, and fragmentation, subjectively reported numbers of nocturnal awakenings, total nocturnal wake time, and sleep quality...

The objective of this study was to improve the reliability of the endurance test for the powertrain system of military tracked vehicles. The measurement system that measures the driving duty applied to the powertrain system caused by mobility on roads consists of eight analog channels and two pulse channels, including the propeller shaft output torques for the left and right sides. The data obt...

In this paper, dynamic analyses and field measurements of a tied arch railway bridge is presented. Excessive vibrations of the hangers were obtained, caused by resonance during train passages. The resulting increase of the stress level and number of stress cycles were shown to decrease the fatigue service life significantly. The most critical section is a threaded turnbuckle connection of the h...

PURPOSE/OBJECTIVES To systematically review published qualitative reports of descriptions of fatigue by patients with cancer and how cancer-related fatigue (CF) affects their lives. DATA SOURCES MEDLINE®, CANCERLIT®, Cochrane Database of Systematic Reviews, and the Cumulative Index to Nursing and Allied Health Literature. DATA SYNTHESIS Two researchers conducted independent reviews of 667 p...

BACKGROUND Establishing a threshold number of working hours is very important when making recommendations to protect people from the potentially harmful health effects caused by long working hours. AIM To clarify the influence of working hours on both mental and physical symptoms of fatigue and use the data obtained to determine permissible working hours. METHODS Cross-sectional survey of m...

Nickel-base superalloys have been used extensively in power generation applications due to their high strength at temperatures up to 1093°C. When the material is subjected to complex mechanical loading superimposed with thermal loading, fatigue interacts with either creep and/or oxidation. Directionallysolidified (DS) materials are often used in place of polycrystalline (PC) materials since the...

Many structures are subjected to variable amplitude loading in engineering practice. The foundation of fatigue life prediction under variable amplitude loading is how to deal with the fatigue damage accumulation. A nonlinear fatigue damage accumulation model to consider the effects of load sequences was proposed in earlier literature, but the model cannot consider the load interaction effects, ...

In this paper we propose the beta slashed generalised half-normal distribution, which includes some important distributions such as half-normal, and distributions. Explicit expressions for cumulative distribution characteristic functions are derived. The maximum likelihood estimates of parameters obtained via EM algorithm value proposed model is illustrated with an application on fatigue data. ...