BP neural network is a typical algorithm in artificial intelligence networks, and it has strong nonlinear mapping ability, solving some nonlinear problems and pattern recognition is its most ...prominent part. The network topology of the BP neural network is simple, it has high error precision, it is easy to program, and also has strong operability, it is one of the most important algorithms in the field of data mining. Cheerleading is one of the dance cheerleading events, because of its sunshine, fashion and vitality, it has become a new sports event on campus, although cheerleading has developed rapidly in China, its promotion on campus is still at the initial stage, with the increasing number of public contestants, the competition among the participating teams has become increasingly fierce, excellent choreography is the key to victory, by using the methods of literature, video analysis and mathematical statistics, the author made an in-depth analysis of the top eight teams, including 24 teams, who achieved the best in the collective flower ball optional complete set of actions in the three open national cheerleading championships from 2019 to 2021, grasp the current situation and trend of the arrangement of free flower ball movements in the open children’s group, and summarize its rules, it provides a theoretical basis for the arrangement of the set of collective flower ball optional movements of the open university group, improve the overall level of the flower ball cheerleading program of the open university group, and play a role in consolidating the basic learning of flower ball cheerleading.
ABSTRACT Introduction: Chronic fatigue syndrome (CFS), also known as chronic fatigue and immune dysfunction syndrome, has become a common disease in modern medicine. Objective: The paper analyzes the ...impact of exercise training on patients' quality of life with chronic fatigue syndrome. Methods: We conducted fatigue investigations on college students and analyzed the exercise ability of college students with chronic fatigue syndrome. We then compared the findings with healthy college students. In the process, we recorded the physiological indicators and satisfaction scores of the two groups of patients. Results: Muscle endurance and cardiopulmonary function-related exercise ability of the college students with chronic fatigue syndrome are significantly different. After completing the same exercise, the scores of personal exertions were higher. Conclusion: Appropriate and regular exercise can achieve ideal results in the treatment of chronic fatigue syndrome. In-depth research, popularization, and application by scholars is highly suggested. Level of evidence II; Therapeutic studies - investigation of treatment results.
RESUMEN Introducción: La síndrome de la fatiga crónica (SFC), también conocida como fatiga crónica e inmunodeficiencia, se ha tornado una enfermedad común para la medicina moderna. Objetivo: Este estudio analiza el impacto del entrenamiento de ejercicios en la calidad de vida de pacientes con síndrome de fatiga crónica. Métodos: Conducimos investigaciones sobre la fatiga en estudiantes universitarios y analizamos la habilidad para ejercicios de estudiantes universitarios con síndrome de fatiga crónica. Durante el proceso, registramos indicadores fisiológicos y puntajes de satisfacción de los dos grupos de pacientes. Resultados: La resistencia muscular y habilidad en practicar ejercicios relacionados a la función cardiopulmonar de los estudiantes universitarios con síndrome de fatiga crónica son significativamente diferentes. Tras completar el mismo ejercicio, los puntajes de esfuerzo personal eran más altos. Conclusión: Ejercicios adecuados y regulares pueden atingir resultados ideales en el tratamiento de la síndrome de fatiga crónica. Investigaciones profundizadas, la popularización y la aplicación por los investigadores son altamente recomendadas. Nivel de evidencia II; Estudios terapéuticos – investigación de resultados de tratamiento.
RESUMO Introdução: A síndrome da fadiga crônica (SFC), também conhecida como fadiga crônica e síndrome de disfunção imunológica, tem se tornado uma doença comum para a medicina moderna. Objetivo: Este estudo analisa o impacto do treinamento de exercícios na qualidade de vida de pacientes com síndrome de fadiga crônica. Métodos: Conduzimos investigações sobre a fadiga em estudantes universitários e analisamos a habilidade para exercícios de estudantes universitários com síndrome de fadiga crônica. Durante o processo, registramos indicadores fisiológicos e escores de satisfação dos dois grupos de pacientes. Resultados: A resistência muscular e habilidade em praticar exercícios relacionados à função cardiopulmonar dos estudantes universitários com síndrome de fadiga crônica são significativamente diferentes. Após completar o mesmo exercício, os escores de esforço pessoal eram mais altos. Conclusão: Exercícios adequados e regulares podem atingir resultados ideais no tratamento da síndrome de fadiga crônica. Pesquisas aprofundadas, a popularização e a aplicação por parte de pesquisadores são altamente recomendadas. Nível de evidência II; Estudos terapêuticos – investigação de resultados de tratamento.
To intuitively reveal the influences of original solder grain orientation on thermal fatigue damage mechanisms of the SnAgCu/Cu solder joints at relatively high temperature, in this study the solder ...joints were prepared, and their thermal fatigue damage and microstructure evolution processes were in-situ characterized. It was found that most of the solder joints are single crystal, and the others have 2 or 3 solder grains. Under the thermal cycling of 20 °C ~ 140 °C, the interfacial strain concentration is more serious than that cycled at relatively low temperature, and the damage accumulation rate is higher. The original solder grain orientation determines the activation of slip systems and the plastic deformation degree, especially at the interfacial strain concentration zone. Due to softening of the solder and the high recovery rate, deformation of the solder not close to the joint interface is not very serious. The slip bands are not straight, and the activated slip systems are the {110}<001 > and {100}<001 > systems, but different slip systems can be activated at different zones within one solder grain. For the solder joints with 2 or 3 solder grains, deformation of the grain with higher Schmidt factor is restricted by the other grains, and the deformation mismatch resulting in grain boundary (GB) sliding. The high temperature recovery and relative torsion between different parts of the solder grains form new low-angle GBs. For a group of solder joints, the joint most susceptible to deformation determines the life of the device.
Flotation separation of valuable components including graphite and lithium cobalt oxide (LCO) from the waste electrode materials of lithium battery is a key link in the recycling of waste lithium ...battery, which is difficult to realize with some conventional flotation techniques due to the fine size of graphite and LCO. Interfacial nanobubbles induced by temperature increasing were introduced into the flotation system and the mechanism on improving the flotation performance of electrode materials by nanobubbles was studied by combining intermittent mode atomic force microscope (AFM) imaging technique, colloidal probe technique, agglomeration size analyzer, particle-bubble interaction visualization and flotation. The results show that the images of nanobubbles were captured at highly oriented pyrolytic graphite (HOPG) and alumina surface with intermittent mode AFM. The detachment and/or coalescence of nanoentities in the action of AFM tip at contact mode provided evidence supporting gaseous nature of these nano
Commercial health insurance is an important part of China's multi-level medical security system, and actively promoting the innovation and development of commercial health insurance is crucial to the ...establishment and improvement of a multi-level social security system. Existing literature rarely studied or refined the laws of insurance company health insurance innovation, especially the research on insurance clauses and product levels. Based on the text analysis of medical insurance product clause data of Chinese insurance companies from 2009 to 2022, this paper dismantles the content and structure of insurance company medical insurance clauses, extracts relevant characteristics and laws, summarizes and extracts innovative elements based on the development history of commercial health insurance in China. This paper finds that the innovation of China's health insurance products has gone through the process of expanding the scope of liability coverage, introducing new medical technologies and optimizing medica
Understanding leadership functioning in virtual teams becomes critical as organizations increasingly use dispersed teams for talent acquisition. In the current article I present a preliminary model ...that explicates how task- and relationship-oriented leader behaviors influence team and individual processes and outcomes in virtual teams. Further, I discuss cross-level relationships between virtual team and individual processes, as well as the boundary effects of contextual factors (i.e., task complexity, task interdependence, and virtuality) in virtual leadership functioning.
The increasingly large scale of location-based social networks (LBSN) promotes the rapid development of point-of-interest (POI) recommendation business. POI geospatial distance directly adopted by ...traditional methods is difficult to simulate the highly random behavior path of users. And the point-of-interest recommendation process brings sensitivity to the location distance measurement. Meanwhile, the sparse POI check-in data of users in social networks are also easy to have a huge impact on the recommendation accuracy. To solve the above issues, geographically insensitive spatio-temporal POI recommendation model based on heterogeneous graph embedding (GIPR) is proposed. Firstly, the user behavior sequence is introduced to construct the spatial and temporal topological diagram of the behavior POI. The weighted spatial path is used to represent the relative location distance. It can not only conform to the characteristics of user behavior, but also reduce the sensitivity of the recommendation process to the di
Fiber-reinforced ceramic matrix composites have many excellent mechanical properties for their high specific modulus, high specific strength, low coefficient of thermal expansion, high temperature ...resistance, corrosion resistance and wear resistance. Due to these properties, fiber-reinforced ceramic matrix composites have been widely applied in aerospace and other fields. However, fiber-reinforced ceramic matrix composites are difficult to machine due to their heterogeneity, anisotropy, high hardness and brittleness. Therefore, it is necessary to conduct in-depth research on the machining mechanism of this kind of composites. This paper systematically reviews the research status of conventional machining method and non-conventional machining method of fiber-reinforced ceramic matrix composites. It also generalizes the development trend, advantages and disadvantages, application scope, existing problems, and corresponding solutions of various machining methods. Compared with the conventional machining method,
Background Exposure to polychlorinated biphenyls (PCBs) during pregnancy can affect hematological indicators and has the potential to reduce immune response during early pregnancy, but there are ...limited studies on their adverse health effects on older adults. Objective This study explores the associations between plasma PCBs levels and blood routine indicators in community-dwelling older adults. Methods From August 2014 to February 2015, a total of 150 community-dwelling adults above 60 years old were recruited, and routine blood examinations and basic information surveys were conducted. The exposure levels of six PCB congeners (PCB28, PCB52, PCB101, PCB138, PCB153, and PCB180) in plasma were detected by gas chromatography-tandem mass spectrometry (GC-MS/MS). The associations of the concentrations of PCB101 (positive rate above 50%), the sum of three low chlorinated congeners (Σ3LPCBs), and the sum of six PCBs (Σ6PCBs) with blood routine indicators or ratio indicators were analyzed using multiple linear