Journal articles on the topic 'Quasi-Physical Methods'
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1
Önen, Onursal. "Dispersion and Sensitivity Analysis of Quasi-Scholte Wave Liquid Sensing by Analytical Methods." Journal of Sensors 2017 (2017): 1–9. http://dx.doi.org/10.1155/2017/9876076.
Abstract:
Ultrasonic-guided wave sensing relies on perturbation of wave propagation by changing physical properties of the target media. Solid waveguides, through which guided waves can be transduced between the transducer and the target media, are frequently employed for liquid sensing and several other applications. In this manuscript, liquid sensing sensitivity of dispersive quasi-Scholte waves, which are guided interface waves that travel at the solid-liquid boundary, is investigated. Dispersion analysis of quasi-Scholte waves is done and sensitivities of quasi-Scholte waves to changes in fluid density and speed of sound in a dipstick configuration are analyzed. An experimentally verified analytical model based on a global matrix approach is employed in a nondimensional manner to generate representative dispersion and sensitivity surfaces. Optimum configurations with respect to the material properties of the liquid and of the waveguide are illustrated, which would enable optimal quasi-Scholte liquid sensing.
2
Davis, Kyle, Miriam Schulte, and Benjamin Uekermann. "Enhancing Quasi-Newton Acceleration for Fluid-Structure Interaction." Mathematical and Computational Applications 27, no. 3 (May 6, 2022): 40. http://dx.doi.org/10.3390/mca27030040.
Abstract:
We propose two enhancements of quasi-Newton methods used to accelerate coupling iterations for partitioned fluid-structure interaction. Quasi-Newton methods have been established as flexible, yet robust, efficient and accurate coupling methods of multi-physics simulations in general. The coupling library preCICE provides several variants, the so-called IQN-ILS method being the most commonly used. It uses input and output differences of the coupled solvers collected in previous iterations and time steps to approximate Newton iterations. To make quasi-Newton methods both applicable for parallel coupling (where these differences contain data from different physical fields) and to provide a robust approach for re-using information, a combination of information filtering and scaling for the different physical fields is typically required. This leads to good convergence, but increases the cost per iteration. We propose two new approaches—pre-scaling weight monitoring and a new, so-called QR3 filter, to substantially improve runtime while not affecting convergence quality. We evaluate these for a variety of fluid-structure interaction examples. Results show that we achieve drastic speedups for the pure quasi-Newton update steps. In the future, we intend to apply the methods also to volume-coupled scenarios, where these gains can be decisive for the feasibility of the coupling approach.
3
Gorbunova, Natalya V., and Rimma R. Globenko. "Improving the Organization of Quasi-Professional Activities of Masters of Adaptive Physical Education as a Guarantee of Increasing Professional Competence." Journal of Pedagogical Innovations, no. 2 (June 3, 2024): 60–69. http://dx.doi.org/10.15293/1812-9463.2402.06.
Abstract:
Introduction. The article discusses the problem: what are the effective forms and methods of work of developing professional competence among masters of the department of physical education in the field of training “Physical education for persons with health problems (adaptive physical education)” of the Sevastopol Institute of Economics and Humanities (branch) of the Crimean Federal University named after V. I. Vernadsky. The purpose of the study is to substantiate the importance of organizational and methodological improvement of the quasi-professional sector of the educational process. Methodology. Using scientific methods of pedagogical observation, questioning, studying the products of pedagogical activity and pedagogical documents, the authors substantiate the role of inclusive competence as an integral part of professional competence, as well as the possibility of its optimal improvement at the quasi-professional stage of the educational process using special pedagogical technologies and methods, including conducting sociocultural inclusive events. Results. It was revealed that masters of the Faculty of Physical Culture have, in general, sufficient and strong theoretical knowledge in the field of inclusion. At the same time, masters who carried out educational activities in traditional forms and in standard organizational and methodological conditions demonstrated unstable, weak skills in applied, practical activities related to inclusive competence. Conclusions. The main reserves for increasing the inclusive competence of master of physical education lie in the quasi-professional sector of the educational process, and the task of increasing the level of inclusive competence of master of physical education, and therefore increasing their overall professional level, can be solved by intensifying and optimizing educational and applied activities at the quasi-professional stage formation of inclusive competence.
4
Murphy, Paula, Tim Persoons, Seamus O’Shaughnessy, and Darina Murray. "A comparison of postprocessing methods for hot film sensors for the heat transfer analysis of impinging jet flows." Journal of Physics: Conference Series 2116, no. 1 (November 1, 2021): 012043. http://dx.doi.org/10.1088/1742-6596/2116/1/012043.
Abstract:
Abstract The aim of this investigation is to optimise the data post-processing techniques associated with hot film sensors when intended to be used as a means of accurate, high-resolution heat flux measurement. More specifically, this project focuses on the performance of hot film sensors operated in a constant temperature anemometer bridge, used in conjunction with impinging jet air flows. The characteristic heat transfer behaviour in this impinging jet flow provides the reference against which the heat flux data attained using the hot film sensor is compared. As part of this investigation, three hot film calibration methods are examined for a range of sensor overheat values: (A) a wall shear correction method, (B) a physical quasi 1-D conduction model and (C) a physical quasi 2-D fin conduction model. The results show that the method C, when used in conjunction with a 5 K sensor overheat, best replicated that of the reference heat flux sensor for the jet configurations investigated.
5
Fedotov, M. Yu. "METHODS FOR THE FORMATION OF SPATIAL TOPOLOGY AND INTERROGATION OF FIBER-OPTIC SENSORS FOR DIAGNOSTICS OF COMPOSITE STRUCTURES (Review)." Kontrol'. Diagnostika, no. 298 (April 2023): 24–37. http://dx.doi.org/10.14489/td.2023.04.pp.024-037.
Abstract:
The paper formulates general requirements for the formation of spatial topologies of quasi-distributed fiber-optic systems of embedded monitoring based on fiber Bragg gratings for monolithic and three-layer structures made of polymer composite materials. The main types of spatial topologies of fiber-optic sensors for the implementation of an effective quasi-distributed system of embedded diagnostics of composite structures are considered. The main methods for interrogating arrays of fiber-optic sensors that form a quasi-distributed system of embedded diagnostics of composite structures are analyzed, an overview and analysis of the technical characteristics of foreign and domestic interrogation equipment is given. It has been established that for practical applications, taking into account the relative simplicity of physical implementation and the availability of interrogation equipment, it is advisable to use a mixed topology of fiber-optic sensors, which includes elements of serial and star topologies, with he spectral channel separation method being the most optimal.
6
Sil'chenko, Ol'ga, Marina Siluyanova, and Petr Hopin. "STRENGTH PROPERTIES INVESTIGATION OF COMPOSITE COATINGS WITH QUASI-CRYSTALS OBTAINED THROUGH METHODS OF GAS DYNAMIC SPUTTERING." Bulletin of Bryansk state technical university 2020, no. 12 (December 1, 2020): 11–18. http://dx.doi.org/10.30987/1999-8775-2020-12-11-18.
Abstract:
The work purpose is to investigate strength properties of composite coatings with quasi-crystals obtained through the method of gas dynamic sputtering.
The object of development: quasi-crystals based on titanium carbonitride clad with nickel. In the course of the work there is offered a method for investigations of coating strength based on a pin and adhesive method with composites based on titanium carbonitride.
The novelty of this investigation consists in obtaining new materials and investigations of their physical-mechanical properties.
Composite coating on the basis of titanium carbonitride has shown high separation properties. The destruction took place in an intermediate layer between VN20 and KNTP35.
During 10 mm bending there is a fine even mesh. At the impact load made there were not observed chips and separations that allow using coating data in heavy-loaded parts.
7
Zul Fadli Rambe, Ahmad, Phil Yanuar Kiram, Arsil Arsil, Ridho Bahtra, and Yovhandra Ockta. "Improvement of basic soccer techniques with training methods and physical condition." Jurnal SPORTIF : Jurnal Penelitian Pembelajaran 10, no. 1 (April 23, 2024): 76–89. http://dx.doi.org/10.29407/js_unpgri.v10i1.21575.
Abstract:
This study aims to investigate the effect of small-sided games and rondo training methods, as well as physical conditions, on the basic technique skills of passing, controlling, and dribbling soccer players. This research mode is a Quasi-Experiment with a factorial research design. The sample consisted of 38 child soccer athletes aged 10-12 years from the Wijaya men's soccer team, with purposive sampling from young soccer players (10-12 years) from the Wijaya men's soccer team in Padang. Skill measurements are performed with bounce board instruments for passing control, dribbling tests, agility tests (Illinois Agility Run Test), and speed tests (30-meter run) to measure physical condition. Data analysis using a two-track ANOVA test with a significance level of α 0.05. The results showed that there was a significant difference in the effect of the Small-Sided Games and Rondo methods on passing control (F = 5.931, p = 0.025 < 0.05) and dribbling (F = 61.588, p = 0.000 < 0.05) soccer players. In addition, there is a difference between high and low physical conditions for passing control and dribbling (α < 0.05). Furthermore, there was a significant interaction between training methods and physical condition on passing control (F = 9.481, p = 0.007 < 0.05) and dribbling (F = 88.817, p = 0.000 < 0.05). This study concluded that small-sided games, rondo training methods, and physical conditions have a significant effect on the basic skills of soccer players.
8
Sabchevski, S., I. Zhelyazkov, E. Benova, V. Atanassov, P. Dankov, M. Thumm, A. Arnold, J. Jin, and T. Rzesnicki. "Quasi-optical converters for high-power gyrotrons: a brief review of physical models, numerical methods and computer codes." Journal of Physics: Conference Series 44 (July 1, 2006): 102–9. http://dx.doi.org/10.1088/1742-6596/44/1/012.
9
dos Santos Azevedo, Juarez, and Saulo Pomponet Oliveira. "A Numerical Comparison Between Quasi-Monte Carlo and Sparse Grid Stochastic Collocation Methods." Communications in Computational Physics 12, no. 4 (October 2012): 1051–69. http://dx.doi.org/10.4208/cicp.260111.230911a.
Abstract:
AbstractQuasi-Monte Carlo methods and stochastic collocation methods based on sparse grids have become popular with solving stochastic partial differential equations. These methods use deterministic points for multi-dimensional integration or interpolation without suffering from the curse of dimensionality. It is not evident which method is best, specially on random models of physical phenomena. We numerically study the error of quasi-Monte Carlo and sparse grid methods in the context of ground-water flow in heterogeneous media. In particular, we consider the dependence of the variance error on the stochastic dimension and the number of samples/collocation points for steady flow problems in which the hydraulic conductivity is a lognormal process. The suitability of each technique is identified in terms of computational cost and error tolerance.
10
Nkwocha, Francis Kehinde, and Wasiu Owolabi. "Demonstration Methods in Primary Schools: A Study of Academic Achievement in Physical and Health Education." Journal of Innovation and Research in Primary Education 2, no. 1 (June 30, 2023): 7–13. http://dx.doi.org/10.56916/jirpe.v2i1.408.
Abstract:
This research aimed to investigate how the demonstration method influences the academic performance of primary school students in physical and health education in Kwara State, Nigeria. The study followed a quasi-experimental design, involving 79 pupils from two public primary schools. The research utilized the 'Physical and Health Education Achievement Test (PHEAT)' as the assessment tool, which was carefully validated and tested for its reliability, showing a reliability index of 0.76 using the test-retest method. Two hypotheses were formulated and examined using Analysis of Covariance (ANCOVA). The results of the study revealed a significant positive impact of the demonstration method on pupils' academic achievement in Physical and Health Education. However, when considering gender as a factor, the interaction between treatment and gender did not show a significant effect on pupils' academic achievement in the same subject. In conclusion, the findings suggest that using the demonstration method can enhance the academic achievement of primary school pupils in physical and health education, irrespective of their gender. Based on these results, it is recommended that teachers receive training in utilizing the demonstration method while teaching Physical and Health Education.
11
Centeio, Erin E., Yeonhak Jung, and Darla M. Castelli. "ACTIVE YOU: Teacher Attributes and Attitudes Predicting Physical Activity Promotion." Behavioral Sciences 13, no. 3 (March 1, 2023): 210. http://dx.doi.org/10.3390/bs13030210.
Abstract:
Background: Based on the Health Belief Model, this study examined preservice teacher attributes and attitudes toward providing physical activity opportunities for children in school. Methods: A quasi-experimental design was used to collect proof of concept and feasibility data for the ACTIVE YOU intervention as part of teacher education. Conclusions: Examination of a diverse sample of preservice teachers during their fieldwork revealed that those who engage in healthy behaviors and had positive attitudes toward physical activity in schools are more likely to take action and promote physical activity for their students.
12
Еськов, Valeriy Eskov, Фудин, N. Fudin, Королев, V. Korolev, Хадарцев, and Aleksandr Khadartsev. "Modeling of the Dynamics of State Vector of Human Organism in the Conditions of Pulse Hyper-Gravitational Physical Loading." Journal of New Medical Technologies 20, no. 4 (December 20, 2013): 16–24. http://dx.doi.org/10.12737/2719.
Abstract:
The effect of hyper-gravity with pulse acceleration was studied in 156 boys and girls by means of device «Power Plate». This paper presents the regularities of behavior parameters quasi-attractors of state vector organism of human being in multidimensional phase space of states in the conditions of pulse hyper-gravitational physical load. The effects were evaluated by means of pulso-metry, rheovasography and the multifunctional complex M35 (USA). Processing of the results was carried out on a license package of statistical programs and methods for neural network to identify the parameters of the order. It is established that a single exposure to a pulsed physical hyper-gravitational activity the regulation of the cardiovascular system is manifested by the change of the distance between the centers of quasi-attractors state vector of the human organism, as well as the volume of m-dimensional parallelepiped, bounding quasi-attractors, due to the factors of gender and the initial level of frequency of cardiac rhythm. Features of change of parameters of the regional hemodynamics and blood pressure in young people with normal cardiac rhythm and tachycardia were identified. Low-amplitude hyper-gravity of an untrained people with normal cardiac rhythm provokes various changes of the quasi-attractors parameters. Informative methods of the theory of chaos and self-organization in the study of the influence of stress on the human body were presented. In the researches, according to multiparameters, on the influence of hyper-gravity on the function of the cardiovascular system greater prognostic importance are the results of data processing by means of the method of multidimensional phase spaces.
13
Syahruddin, Syahruddin. "The effect of learning methods and motivation on learning outcomes of long jump skills." Jurnal SPORTIF : Jurnal Penelitian Pembelajaran 8, no. 4 (December 27, 2022): 426–39. http://dx.doi.org/10.29407/js_unpgri.v8i4.18904.
Abstract:
The results of learning physical education skills were not limited to physical development but also mental development and motivation to learn. The purpose of this study was to determine the effect of the block method (BM) and the play-based random method (RM) on long jump skills (JLS) in terms of motivation (MTV). This type of research is quasi-experimental with a 2x2 factorial design. A sample of 20 Samiun Makassar public primary school students was randomly selected and divided into four groups. Treatment research for eight weeks. Before treatment, the sample was divided into two, high motivation (MTVH) and low motivation (MTVL), through questionnaires and the final test of long jump skills learning outcomes (JLS). The results showed that BM significantly increased JLS compared to RM (P<0.05). There was a significant interaction between Mt and MTV (P<0.05). The MTVH student group using MBB1 had better JLS than MRB1 (P<0.05). The group of students who had MTVL had no difference in results between MBB2 and MRB2 (P>0.05). KLJ in physical education for elementary school students is very good at using MB, and the teacher increases MTV during learning.
14
Htet, Tun Lin, and P. Prosuntsov. "Comparative analysis of methods for calculating the physico-mechanical characteristics of multi-layered composite materials." E3S Web of Conferences 376 (2023): 01050. http://dx.doi.org/10.1051/e3sconf/202337601050.
Abstract:
The paper presents a comparative analysis of methods and results of calculating the physical and mechanical characteristics of single-layered and multi-layered polymer composite materials (PCM). The object of the study is a polymer composite which consists of epoxy binder and carbon fiber reinforcements. The principle of multiscale modelling is applied to determine the physical and mechanical characteristics of the composite. Within the framework of this study, a representative volume element (RVE), the structure of which corresponds the characteristics of real materials, is used. The initial data for the calculation in this case are physical and mechanical characteristics of anisotropic fibers (carbon fabric) and an isotropic binder, as well as the geometric model of the RVE. As a result of the calculation, the effective characteristics of a quasi-homogeneous anisotropic material suitable for numerical analysis of the composite structures are determined. A comparison of the results of determining the physical and mechanical characteristics of the polymer composite using ANSYS Material Designer and MSC Digimat software packages for various size of RVE model is carried out and ANSYS Workbench software is also used to perform the stress-strain conditions of RVE model to determine the physico-mechanical characteristics of polymer composites.
15
Antonio Borges, Romes, Daniel Gonçalves, Antônio Marcos De lima, and Lázaro Fonseca Júnior. "MODEL REDUCTION METHODS APPLIED TO A NONLINEAR MECHANICAL SYSTEM." International Journal for Innovation Education and Research 7, no. 7 (July 31, 2019): 281–300. http://dx.doi.org/10.31686/ijier.vol7.iss7.1611.
Abstract:
Modern structures of high flexibility are subject to physical or geometricnonlinearities, and reliable numerical modeling to predict their behavior is essential.The modeling of these systems can be given by the discretization of the problem usingthe Finite Element Method (FEM), however by using this methodology, it is a veryrobust model from the computational point of view, making the simulation processdifficult. Using reduced models has been an excellent alternative to minimizing thisproblem. Most model reduction methods are restricted to linear problems, whichmotivated us to maximize the efficiency of these methods considering nonlinearproblems. For better accuracy, in this study, adaptations and improvements aresuggested in reduction methods such as the Enriched Modal Base (EMB), the SystemEquivalent Reduction Expansion Process (SEREP), QUASI-SEREP and the IteratedImproved Reduced System (IIRS). The stability of a system is discussed according tothe calculation of the Lyapunov exponents and phase space. Numerical simulationsshowed that the reduced models presented a good performance, according to thecommitment of quality and speed of responses (or time saving).
16
Capella-Peris, Carlos, Jesús Gil-Gómez, and Òscar Chiva-Bartoll. "Innovative Analysis of Service-Learning Effects in Physical Education: A Mixed-Methods Approach." Journal of Teaching in Physical Education 39, no. 1 (January 1, 2020): 102–10. http://dx.doi.org/10.1123/jtpe.2019-0030.
Abstract:
Purpose: To compare the development of teaching competency in preservice teachers of physical education (n = 96) through two different modalities of intervention from the same service-learning program. The preservice teachers provided a direct service to children with motor functional diversity, promoting their motor skills and counteracting their lack of social attention. Method: The topic was approached using mixed methods with methodological triangulation. Quantitative evidence was gathered through a quasi-experimental design of two nonequivalent experimental groups implementing the following instrument: the Teaching Competency while performing Motor Skills and Body Language Games Rubric. Meanwhile, qualitative analysis was undertaken by elaborating upon 12 life histories of multiple crossed stories. Results: The quantitative results provided significant evidence regarding the academic effect of service-learning on preservice teachers, while the qualitative interpretation complemented this view, reflecting on how this learning was developed. Discussion/Conclusion: The authors provided the original findings of the service-learning effects on the teaching competency of preservice teachers as well as the promotion of additional academic and social learning.
17
Rusmana, Asep, and Wan Zailan Kamaruddin Wan Ali. "Sufism Healing Methods for Drug Rehabilitation in Inabah of West Java, Indonesia." TEMALI : Jurnal Pembangunan Sosial 5, no. 2 (November 16, 2022): 153–60. http://dx.doi.org/10.15575/jt.v5i2.21234.
Abstract:
Sufism activities include not only rituals but also pseudo-medical treatment. This can be seen from the daily life of the Qadiriyyah and Naqsabandiyah (TQN) congregation at the Suryalaya Islamic Boarding School, Tasikmalaya, West Java. Known as a center for Islamic learning, this pesantren also offers spiritual healing, namely inabah to cure drug victims. This study aims to explore this Sufi inabah . Based on a qualitative ethnographic study at this site, the study analyzes explicitly a method of treatment called inabah. This is a unique technique used by Sufis to cure drug patients. This study shows that the Sufis provide spiritual and technical guidance in the treatment process to increase the awareness of drug victims through quasi-medical and spiritual processes. In the view of the Sufis, drugs can be cured by growing spiritual activities, such as remembrance and prayer. More than that, this method also requires the practice of realized repentance, fasting, bathing, and other related processes prescribed by Sufi masters. The process of fulfilling spiritual and physical requirements due to illness or disease is seen as the result of spiritual and physical transgression.
18
Liu, Wenxi, Nan Zeng, Daniel J. McDonough, and Zan Gao. "Effect of Active Video Games on Healthy Children’s Fundamental Motor Skills and Physical Fitness: A Systematic Review." International Journal of Environmental Research and Public Health 17, no. 21 (November 9, 2020): 8264. http://dx.doi.org/10.3390/ijerph17218264.
Abstract:
Objective: The present study aimed to synthesize the most updated literature regarding the casual evidence of the effects of active video games (AVGs) on fundamental motor skills (FMS; locomotor skills and object control skills) and physical fitness among healthy children. Methods: Electronic databases were searched through October 2020. Peer-reviewed randomized control trials (RCTs) and quasi-experimental designs examining the effectiveness of AVGs on FMS and physical fitness development among healthy children (3–12 years) were screened. Results: A total of nine RCTs and one quasi-experimental study were included. Of the five studies examining the effect of AVGs on FMS, two reported significant improvements, while three reported no significant improvements in motor skills development as compared to control. Of the five studies assessing the effects of AVGs on physical fitness, four reported significant improvements in physical fitness such as balance, agility, and speed, whereas one reported significant improvements in skill-related executive function, but not in physical competence. Conclusions: Overall, the current available evidence supports AVGs as an effective means to improve physical fitness, such as balance, postural stability, and agility, among healthy children. However, the findings of AVGs on healthy children’s object control and locomotor skills remain inconclusive.
19
Pegin, P. A., and A. A. Shulgin. "Modern methods for calculating transport infrastructure objects for progressive collapse." BRIСS Transport 2, no. 3 (October 25, 2023): 1–6. http://dx.doi.org/10.46684/2023.3.6.
Abstract:
Modern Russian methods for calculating transport infrastructure objects for progressive collapse have been analysed and classified. An overview of the methods implemented in the SCAD and LIRA computer systems has been made. The transport infrastructure objects of the frame scheme have been calculated for progressive collapse with the removal of the supporting element. The results of the calculation of the frame scheme, taking into account additional parameters: damping of elements; joint work of the floor and steel structure elements; physical and geometric nonlinearity have been analysed. Analytical, statistical and mathematical methods were applied.It has been established that the existing software systems have sufficient functionality for calculating transport infrastructure objects in a static, dynamic, linear and non-linear problem setting. The results of calculations performed in different computer systems show different results in dynamic and quasi-static methods.The necessity of adjusting the existing Russian building codes, taking into account the calculation procedures in modern computer systems, is revealed.
20
Svitlytskyi, Viktor, Sergii Iagodovskyi, and Iryna Boshkova. "Investigation of drill string dynamics using probabilistic methods." Technology audit and production reserves 1, no. 1(75) (January 16, 2024): 51–55. http://dx.doi.org/10.15587/2706-5448.2024.296725.
Abstract:
The object of research is a drill string. The work is directed to the study of the drill string dynamics and its influence on the rock, which is drilled using probabilistic methods. It is shown that the nature of the vibrations of the top of the drill string and the downhole signals are different and have a stationary random character. It is proved that the process at the output of the drill string, taking into account random disturbances, is narrow-band (quasi-harmonic) or close to it. It is found that the energy composition of the spectrum sections and the appearance of resonance peaks and their displacement is directly determined by the physical and mechanical properties of the rocks being drilled, as one of the factors that determines the vibration state of the drill string. Graphs of the spectral density of the power of pitting vibrations are given, showing their amplification at frequencies of 30–40 Hz as the hardness of the rocks being drilled increases. The maximum of the power density bending curve shifts towards low frequencies. There is a «mutual convergence» of the maxima of the power spectral density of the oscillations of the top and bottom of the drill string. It is shown that an important feature of drill string vibrations in the process of drilling with ball bits is that the intensity of vibrations of the top of the drill string passes with frequencies close to low frequencies, and the vibrations of the bottom of the string – to high frequencies. It is determined that the process at the output of the drill string, taking into account random disturbances, is narrow-band (quasi-harmonic) or close to it. As a result, the assumption of a narrow band at the output of the system, which is the basis of theoretical research, is justified. It is proven that the drill string, as a system with liquid filling under pressure, is more stable compared to a hollow structure. The washing liquid, in this case, plays the role of a dynamic absorber.
21
Mohammad Zaim Zen, Hari Setijono, and Nining Widyah Kusnanik. "The Effect of Single Leg and Double Leg Bounding Exercise Programme (BEP) on Increasing Physical Abilities, Strength, and Agility." Britain International of Humanities and Social Sciences (BIoHS) Journal 3, no. 3 (October 30, 2021): 459–67. http://dx.doi.org/10.33258/biohs.v3i3.525.
Abstract:
The purpose of this study was to investigate and examine the effect of using the Single Leg and Double Leg Bounding Exercise Program (BEP) on the Improvement of Physical Strength and Agility. The subjects of this study were physical education students class 2017 STKIP PGRI Jombang with 42 people. This type of research is quantitative with a quasi-experimental technique (quasi-experimental). Sampling used the solvin formula and purposive sampling technique. The process of collecting data for the initial and final tests used a leg dynamometer test to determine leg muscle strength and the side-step test for agility. The study results on normality and homogeneity tests showed normal and homogeneous data results with a significance value above 0.05. The mean difference test was carried out using the paired test and the Manova test. The method of increasing the ability of strength and agility has a significant improvement with the two experimental methods.
22
Zhang, Qi, Yang Guang Chen, Li Sha Niu, and Hui Ji Shi. "Flow-Induced Corrosion Simulation on a Plate by Finite Element Methods." Key Engineering Materials 353-358 (September 2007): 3116–19. http://dx.doi.org/10.4028/www.scientific.net/kem.353-358.3116.
Abstract:
Flow-induced localized corrosion is regarded as one of the main degradation mechanisms of materials. As an initial step of the simulation of a pipe, a plate is chosen to simplify the problem. In this paper, finite element method is used to simulate the corrosion process in the plate by employing nonlinear geometry and physics equations of the material to describe the quasi-static process. An elastic modulus iterative procedure was performed to obtain the material parameters in consideration of the nonlinear physical properties of corrosion. The effect of corrosion is then considered by introducing a criterion between depth and time, calculating corrosion depth at progressive given time. Dead and live finite elements are employed to consider the invalidation of the material. Thus the movable boundary conditions can be taken into account and the dynamic status of corrosion can be simulated. Stress corrosion process under flowing fluid condition is analyzed and then the results of representative examples are compared with published results.
23
Melo, Aline, and Yaoguo Li. "Geology differentiation by applying unsupervised machine learning to multiple independent geophysical inversions." Geophysical Journal International 227, no. 3 (August 9, 2021): 2058–78. http://dx.doi.org/10.1093/gji/ggab316.
Abstract:
SUMMARY Effective quantitative methods for integrating multiple inverted physical property models are necessary to increase the value of information and advance interpretation further to produce interpretable geology models through geology differentiation. Geology differentiation is challenging in greenfield exploration areas where specific a priori geological information is scarce. The main problem is to identify geological units quantitatively with appropriate 3-D integration of these models. The integration of multiple sources of information has been conducted with different unsupervised machine learning methods (e.g. clustering), which can identify relationships in the data in the absence of training information. For this reason, we investigate the performance of five different clustering methods on the identification of the geological units using inverted susceptibility, density, and conductivity models that image a synthetic geological model. We show that the correlation-based clustering yields the best results for the geology differentiation among those investigated by identifying the correlation between physical properties diagnostic of each unit. The result of the differentiation is a quasi-geology model, which is a model that represents the geology with inferred geological units and their spatial distribution. The resulting integrated quasi-geology model demonstrates that individually inverted models with minimal constraints have sufficient information to jointly identify different geological units.
24
Yuliawan, Ely, Sugih Suhartini, Anggel Hardi Yanto, Eko Kuntaro, and Sofyan. "Exploring stress levels and physical activity patterns: A comparative analysis of blended and conventional learning methods." Journal Sport Area 8, no. 3 (October 8, 2023): 380–87. http://dx.doi.org/10.25299/sportarea.2023.vol8(3).13324.
Abstract:
Changes in learning methods cause a crucial decrease in physical education needs and time of involvement in physical activity, which can affect individual stress levels. The objective of this study was to find out the comparison of physical activity patterns and stress levels between blended versus conventional learning methods. This study used quasi-experimental with a posttest-only approach with a control group design. The total subjects were 160 sports students from Universitas Jambi, who were divided into two groups (Experiment and Control) with average age of 21.69 ± 1.33 years, weight of 55.74 ± 6.48 kg, height of 170.10 ± 5.51 cm, and BMI of 21.06 ± 2.77 kg/m2. The results showed that the blended learning group had a lower level of physical activity when compared to their respective conventional groups. Furthermore, the stress level in the blended learning group had a moderate stress while the conventional group had a low-stress. Thus, the research findings have answered the question that physical activity can affect an individual’s stress level, and conventional learning methods are still the best method compared to blended learning methods. This finding can be used as a reference, especially for educators, both lecturers and teachers in schools, to be able to take a spiritual approach and invite students to do activities they like, such as exercise and recreation, to trigger a sense of enthusiasm in students to continue to improve their fitness degree. Therefore, this will have an impact on mental health, which can affect student stress levels much lower.
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Tucker, Patricia, Brianne A. Bruijns, Kristi B. Adamo, Shauna M. Burke, Valerie Carson, Rachel Heydon, Jennifer D. Irwin, et al. "Training Pre-Service Early Childhood Educators in Physical Activity (TEACH): Protocol for a Quasi-Experimental Study." International Journal of Environmental Research and Public Health 19, no. 7 (March 24, 2022): 3890. http://dx.doi.org/10.3390/ijerph19073890.
Abstract:
Background: Early childhood educators (ECEs) influence young children’s early uptake of positive health behaviours in childcare settings and serve as important daytime role models. As such, it is imperative that post-secondary early childhood education programs provide students with the foundational knowledge and professional training required to confidently facilitate quality active play opportunities for young children. The primary objective of the Training pre-service EArly CHildhood educators in physical activity (TEACH) study is to develop and implement an e-Learning course in physical activity and sedentary behaviour to facilitate improvements in: pre-service ECEs’ self-efficacy and knowledge to lead physical activity and outdoor play opportunities and minimize sedentary behaviours in childcare. This study will also explore pre-service ECEs’ behavioural intention and perceived control to promote physical activity and outdoor play, and minimize sedentary behaviour in childcare, and the implementation of the e-Learning course. Methods/Design: A mixed-methods quasi-experimental design with three data collection time points (baseline, post-course completion, 3-month follow-up) will be employed to test the e-Learning course in early childhood education programs (n = 18; 9 experimental, 9 comparison) across Canada. Pre-service ECEs enrolled in colleges/universities assigned to the experimental group will be required to complete a 4-module e-Learning course, while programs in the comparison group will maintain their typical curriculum. Pre-service ECEs’ self-efficacy, knowledge, as well as behavioural intention and perceived behavioural control will be assessed via online surveys and module completion rates will be documented using website metrics. Group differences across timepoints will be assessed using linear mixed effects modelling and common themes will be identified through thematic analysis. Discussion: The TEACH study represents a novel, evidence-informed approach to address the existing gap in physical activity and sedentary behaviour-related education in Canadian post-secondary early childhood education programs. Moreover, e-Learning platforms, can be employed as an innovative, standardized, and scalable way to provide ECEs with consistent training across jurisdictions.
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Chen, Jing, De Ren Kong, Ting Wei Gu, and Fei Shang. "Research on Computational Method of Characteristic Parameters for Measuring System Based on Quasi-Static Absolute Calibration." Applied Mechanics and Materials 865 (June 2017): 599–604. http://dx.doi.org/10.4028/www.scientific.net/amm.865.599.
Abstract:
Quasi-static absolute calibration is using force with semi-sinusoidal pulse to calibrate pressure measuring system. The pulse width must be wide enough in order to guarantee the effective bandwidth of frequency spectrum be in the flat section of amplitude-frequency characteristics of the tested system. In this way, the result is similar to that from static calibration. The working characteristic parameters for measuring system which is gained from quasi-static calibration is different form static calibration in species, physical meanings and attainment methods. Therefore, the research is of great significance in forming quasi-static calibration system and improving measurement accuracy. The pilot scheme will be introduced in this essay. What is more, the calculation of working characteristic parameters for measuring system will be discussed by taking the force with specific pulse as example, including sensitivity when force transfer to pressure, linearity and repeatability which are used to evaluate the uncertainty of measurement.
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Batrakov, K., and S. Sytova. "MATHEMATICAL MODELLING OF MULTIWAVE VOLUME FREE ELECTRON LASER: BASIC PRINCIPLES AND NUMERICAL EXPERIMENTS." Mathematical Modelling and Analysis 11, no. 1 (March 31, 2006): 13–22. http://dx.doi.org/10.3846/13926292.2006.9637298.
Abstract:
This contribution is devoted to investigation of multiwave Volume Free Electron Laser (VFEL) by methods of mathematical modelling. Special emphasis is placed on consideration of three‐wave VFEL. Mathematical modelling carried out confirmed some preliminary physical estimates. Computer code VOLC for simulation of different schemes of two‐ and three‐wave VFEL is described. Key words: free electron laser, quasi‐Cherenkov instability, simulation, nonlinear integro‐differential system.
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Yasinta Aldinata Arsy, Ali Multazam, and Siti Ainun Marufa. "The effect of yoga and zumba exercises in increasing VO2 max." Physical Therapy Journal of Indonesia 4, no. 2 (July 30, 2023): 182–85. http://dx.doi.org/10.51559/ptji.v4i2.123.
Abstract:
Background: Someone with a healthy and fit body is likely to be able to do a high level of physical activity. Physical exercise can improve physical fitness and has an important element, cardiorespiratory endurance. One way to measure cardiorespiratory endurance is by measuring the maximum volume of oxygen consumption, called VO2 max.
Methods: This type of research uses a quasi-experimental type, namely two pre-and post-test design research groups. The type of quasi-experimental research design uses two groups of subjects, namely group A, who are given yoga exercises, and group B, who are given zumba exercises, with a total of 30 respondents. The cardiorespiratory endurance was measured with the beep test.
Results: Based on the paired sample t-test, the San Zumba yoga group had a result of p<0.05. Whereas in the independent sample T-Test test, the results of p<0.05, it can be concluded that there is a significant difference in the increase in the yoga and zumba groups.
Conclusion: There are differences in the effect of giving yoga and zumba exercises on increasing VO2 max values.
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Torres, A., A. Ribeiro, C. Matos, J. Costa, A. F. Oliveira, I. M. Santos, and S. R. Costa. "Physical and psychoeducation combined group intervention: a quasi-experimental study with Portuguese cancer survivors." European Psychiatry 66, S1 (March 2023): S69—S70. http://dx.doi.org/10.1192/j.eurpsy.2023.235.
Abstract:
Introduction Cancer is a major public health problem worldwide and the risk of death from cancer has decreased continuously since 1991, therefore, This translates into an increasing number of cancer survivors (CS) worldwide. During the survivorship seasons, CS face several short-term, long-term, persistent, and late-emerging health and psychosocial problems, including cancer-related pain, fatigue, menopausal symptoms, anxiety, depression, distress associated with the risk of cancer recurrence, chronic uncertainty, social disruption, alterations of sleep, sexual and cognitive dysfunctions. Since 2002 that some researchers and clinicians argued that it is important to de-velop and implement rehabilitation programs for cancer patients that integrate both psychosocial and physical rehabilitation. Objectives With the scarcity of studies on the effectiveness of combined interventions in this population, despite the strong recommendation to perform and study it, and aiming to contribute to a greater knowledge on the theme, the present work aims to build, implement, and evaluate a combined intervention program, which integrates psychoeducational intervention with physical exercise to cancer survivors and relatives, through the following indicators: psychopathological symptoms (anxiety and depression), self-concept, coping strategies, personal growth and QoL. Methods A non-probabilistic convenience sample of 70 cancer survivors was assigned to: control (without intervention: n=32), combined intervention (n=21) and psychoedu-cation intervention (n=17) groups. Both intervention groups were 9 consecutive weeks duration. The combined intervention group benefited from 2 weekly exercise sessions additionally. It was administered before and after intervention the following questionnaires: demographic; Hospital Anxiety and Depression Scale (HADS); Clinical Self-concept Inventory (ICAC); Cancer Coping Questionnaire (CCQ); sub-scale of Personal Growth of the Psychological Well-being Scale (EBEP) and the World Health Organization Quality of Life Questionnaire (WHOQOL-Bref ). Results It was observed a statistically significant reduction of anxiety and depression symptoms from the beginning to the end of the intervention, as well as a significative improvement of overall and all do-mains of self-concept and personal growth. It was not observed a significative difference on quality of life. Conclusions The findings of this study contribute to support of the beneficial effect of combined intervention on psychological functioning of cancer survivors. Positive effects of the psychological program were observed but not into the same extent as in the combined intervention. Disclosure of Interest None Declared
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Vasetsky, Yu M. "EXACT ANALYTICAL AND APPROXIMATE ASYMPTOTIC CALCULATION METHODS TO DETERMINE THREE-DIMENSIONAL ELECTROMAGNETIC FIELD NEAR CONDUCTING BODY WITH FLAT SURFACE." Tekhnichna Elektrodynamika 2021, no. 4 (June 17, 2021): 3–13. http://dx.doi.org/10.15407/techned2021.04.003.
Abstract:
The analytical solution of the three-dimensional quasi-stationary electromagnetic field problem for a current located near conducting body with a flat surface is considered. The exact and approximate solution of the problem is presented. The exact solution has no restrictions on the external field configuration, physical properties of the medium, and frequency. The approximate solution is based on an expansion in asymptotic series and has limitations: for sinusoidal field, the solution is limited to frequencies above the lower limit; for pulsed field, the solution is limited by the initial time interval of the current pulse. Based on comparison of the results of exact and approximate calculations for nonuniform sinusoidal field at the interface between the media, the admissible value of the introduced small parameter is determined. For pulsed field the proposed choice of the limited time interval for calculating electomagnetic field using the asymptotic method is justified. References 29, figures 7.
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Plaza-Arancibia, Paula, Oscar Achiardi Tapia, and Julio Brugnara Mello. "Effects of slackline training during active breaks and free-time activities break at school on children's attention: a comparison of two-intervention methods." Retos 56 (May 24, 2024): 909–16. http://dx.doi.org/10.47197/retos.v56.103429.
Abstract:
Purpose: To describe the effects of two interventions, regular Physical Education classes plus free active break times and school Physical Education plus Slackline classes during free time, on the attention of schoolchildren. Methods: This is a quasi-experimental study with a quantitative approach. Two groups participated in the interventions: body balance training (Slackline group) (n: 10; age: 7,8±1,93) and free-time activities break (FTA group) (n: 10; age: 7,8±1,22). Attention was assessed using the D-2 test. Repeated measures ANOVA was used. The magnitude of the effect size was estimated by the partial squared eta - η2p. Results: When we analyzed the interactions between time*group, it was not possible to find significant changes attributed to the specificities of the one intervention group, with most results having a medium effect size (η2p≥ 0.06 ≤ 0.25). The results of the paired analysis confirmed that both groups improved the results over time, but the slackline group showed changes with a slightly greater magnitude. Conclusions: Our results demonstrate that in free time, both free physical activities and body balance training are effective for children's attention. However, pairwise analysis revealed that both groups demonstrated improvements over time, with the slackline group showing slightly greater changes in magnitude. Key words: Postural Balance, Physical Education and Training, Exercise, Psychomotor Performance, Cognition
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Chen, Feifei, Jiafu Liu, and Pengfei Chen. "Using Active Learning to Develop the Problem- Solving Ability of Chinese College Students Majoring in Physical Education." International Journal of Higher Education 12, no. 3 (June 20, 2023): 97. http://dx.doi.org/10.5430/ijhe.v12n3p97.
Abstract:
The aim of this study was to undertake research on the building of an active learning physical course that can improve the problem-solving ability of college students majoring in physical education. The study applied a quasi-experimental design, and the participants were 60 Chinese college students. The experimental class consisted of 30 students, who were subjected to active learning methods for 8 weeks, totaling 32 class hours, and the control class without intervention consisted of the other 30 students. The Problem Solving Inventory was applied to the pre- and post-tests. The result showed that problem-solving ability of college students majoring in physical education was significantly improved in the experimental class after the treatment.
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Sullivan, K. J., and H. K. Chang. "Steady and oscillatory transnasal pressure-flow relationships in healthy adults." Journal of Applied Physiology 71, no. 3 (September 1, 1991): 983–92. http://dx.doi.org/10.1152/jappl.1991.71.3.983.
Abstract:
The influence of flow characteristics and gas physical properties on nasal resistance (NR) is difficult to ascertain with traditional rhinomanometric methods because the respiratory airflows used in these methods are largely uncontrolled. As an alternative, we used a novel method of rhinomanometry in which an externally generated flow is passed through the nasal passage via a mouthpiece. The transnasal pressure-flow relationships for both quasi-steady and oscillating flows and with different gases were obtained in five healthy adults with this method. For quasi-steady nasal flows the dimensionless pressure losses were largely independent of physical properties of the gas and a function of the Reynolds number (Re) of the flow. Values of NR for quasi-steady flows were largely independent of flow direction for Re up to roughly 3,000 in all five subjects and for Re up to roughly 19,000 in two of the five subjects. Airway collapse occurred in two subjects at Re greater than 3,000, suggesting that the nonrigid segments of the nasal passage contribute to the intersubject variations in NR at high flow rates. Pressure losses associated with oscillating flows measured at frequencies between 1 and 16 Hz were similar to steady flow losses provided that Re was less than roughly 3,000. For Re greater than 3,000 the oscillating flow resistances were affected by the phasic redistribution of flow into compliant segments of the nasal passage. These results indicate that, for flow rates and harmonic frequencies associated with breathing at rest, the nasal passage behaves as a rigid rough-walled pipe in which pressure losses are largely determined by forces relating to viscous friction and convective accelerations.
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Cahyadi, Eka, Agus Hariyanto, and Dwi Cahyo Kartiko. "Implementation of Inquiry and Group Methods Investigation in PJOK Towards Student’s Participation and Critical Thinking." Jp.jok (Jurnal Pendidikan Jasmani, Olahraga dan Kesehatan) 5, no. 2 (May 30, 2022): 220–28. http://dx.doi.org/10.33503/jp.jok.v5i2.1258.
Abstract:
Physical education is an important part of developing students' interests and talents in schools. Teachers must have a strategy for learners. This research aims to analyze the implementation of the inquiry learning method and group investigation on participation and critical thinking of students. This research was quasi-experiment by using two group pretest-posttest design. The sample in this research were 51 eighth grade students of SMPN 4 Pamekasan. The data collection was carried out using questionnaires and students’ activity assessment sheets. Furthermore, the data analysis was carried out univariate by using the SPSS application. The results of this study in group 1 with the inquiry learning method showed an average increase in student participation by 5%, and critical thinking by 8.8%. Furthermore, the group investigation method in group 2 showed an average increase in student participation by 7.3% and critical thinking by 15.2%.
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Dogossy, G., E. Sági, and Ferenc Ronkay. "Investigation of Mixing Processes of Polymer Composites." Materials Science Forum 729 (November 2012): 332–37. http://dx.doi.org/10.4028/www.scientific.net/msf.729.332.
Abstract:
Three ultrahigh molecular weight polyethylene (UHMWPE) composites of differing composition, reinforced with multiwalled carbon nanotubes (MWCNT) were prepared. The homogeneous distribution of MWCNT has been attempted by two dry blending methods and one melt-mixing process. The efficiency of the various methods was characterized by their effects on the quasi-static and dynamic physical properties of the composites. In the case of composites manufactured by ball milling the effects of various adhesion promoter additives (compatibilizers) has also been studied by analyzing the tensile, flexural, Charpy impact and wear properties of the composites.
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Barbosa, Ana, Stephen Whiting, Ding Ding, João Brito, and Romeu Mendes. "Economic evaluation of physical activity interventions for type 2 diabetes management: a systematic review." European Journal of Public Health 32, Supplement_1 (August 26, 2022): i56—i66. http://dx.doi.org/10.1093/eurpub/ckac074.
Abstract:
Abstract Background Economic evaluation of physical activity interventions has become an important area for policymaking considering the high costs attributable to physical inactivity. However, the evidence for such interventions targeting type 2 diabetes control is scarce. Therefore, the present study aimed to synthesize economic evaluation studies of physical activity interventions for type 2 diabetes management. Methods A systematic review was conducted using the Preferred Reporting Items for Systematic Reviews and Meta-Analyses 2020 statement (PROSPERO reference number CRD42021231021). An electronic search was performed in PubMed, Web of Science, Cochrane Library and NHS Economic Evaluation Database. Studies were eligible if they included: adults with type 2 diabetes; any physical activity intervention in the community settings; an experimental or quasi-experimental design; and a parameter of economic evaluation [cost analysis of interventions, cost-effectiveness analysis (including cost-utility analysis) and cost-benefit analysis] as an outcome. Results Ten studies were included in this review: seven were randomized controlled trials and three were quasi-experimental studies. All studies included direct costs, and four also included indirect costs. Four studies demonstrated that physical activity interventions were cost-saving, six studies showed cost-effectiveness, and two studies reported cost-utility. The estimates varied considerably across the studies with different analytical and methodological approaches. Conclusion Overall, this systematic review found that physical activity interventions are a worth investment for type 2 diabetes management. However, comparability across interventions was limited due to heterogeneity in interventions type, design and delivery, which may explain the differences in the economic measures.
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Zhakulin, A., N. Popov, A. Tungatarov, V. Nefedov, A. Zhakulina, and P. Kropachev. "DETERMINING QUASI-SINGLE-PHASE SOIL SYSTEM SETTLEMENTS TAKING INTO ACCOUNT THEIR CREEP." EurasianUnionScientists 3, no. 5(74) (June 14, 2020): 29–34. http://dx.doi.org/10.31618/esu.2413-9335.2020.3.74.745.
Abstract:
This article discusses determining foundation settlements taking into account the creep of quasi-single-phase and two-phase soil systems of the bases. There is presented distribution of clay soils in depth in the territory of Central Kazakhstan. The analysis of the stratification results shows that physical properties of clays are heterogeneous and have sufficiently large scattering of values in depth. It has been experimentally established that clay soils selected at different depths are characterized by shear decaying creep. Methods of determining the coefficients of consolidation and creep, the deformation modulus from experimental curves are described. The calculationformulas are given for determining quasi-single-phase and two-phase soil systems taking into account their creep. The calculation formulas obtained on the basis of the results of experimental data indicate the novelty of the method.
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Wang, Yu, Minghao Guo, and Justin Solomon. "Variational quasi-harmonic maps for computing diffeomorphisms." ACM Transactions on Graphics 42, no. 4 (July 26, 2023): 1–26. http://dx.doi.org/10.1145/3592105.
Abstract:
Computation of injective (or inversion-free) maps is a key task in geometry processing, physical simulation, and shape optimization. Despite being a longstanding problem, it remains challenging due to its highly nonconvex and combinatoric nature. We propose computation of variational quasi-harmonic maps to obtain smooth inversion-free maps. Our work is built on a key observation about inversion-free maps: A planar map is a diffeomorphism if and only if it is quasi-harmonic and satisfies a special Cauchy boundary condition. We hence equate the inversion-free mapping problem to an optimal control problem derived from our theoretical result, in which we search in the space of parameters that define an elliptic PDE. We show that this problem can be solved by minimizing within a family of functionals. Similarly, our discretized functionals admit exactly injective maps as the minimizers, empirically producing inversion-free discrete maps of triangle meshes. We design efficient numerical procedures for our problem that prioritize robust convergence paths. Experiments show that on challenging examples our methods can achieve up to orders of magnitude improvement over state-of-the-art, in terms of speed or quality. Moreover, we demonstrate how to optimize a generic energy in our framework while restricting to quasi-harmonic maps.
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Guo, Shucheng, Youming Xu, Thomas Hoke, Gobind Sohi, Shuchen Li, and Xi Chen. "Thermal characterization for quantum materials." Journal of Applied Physics 133, no. 12 (March 28, 2023): 120701. http://dx.doi.org/10.1063/5.0124441.
Abstract:
Recently, the study of quantum materials through thermal characterization methods has attracted much attention. These methods, although not as widely used as electrical methods, can reveal intriguing physical properties in materials that are not detectable by electrical methods, particularly in electrical insulators. A fundamental understanding of these physical properties is critical for the development of novel applications for energy conversion and storage, quantum sensing and quantum information processing. In this review, we introduce several commonly used thermal characterization methods for quantum materials, including specific heat, thermal conductivity, thermal Hall effect, and Nernst effect measurements. Important theories for the thermal properties of quantum materials are discussed. Moreover, we introduce recent research progress on thermal measurements of quantum materials. We highlight experimental studies on probing the existence of quantum spin liquids, Berry curvature, chiral anomaly, and coupling between heat carriers. We also discuss the work on investigating the quantum phase transitions and quasi-particle hydrodynamics using thermal characterization methods. These findings have significantly advanced knowledge regarding novel physical properties in quantum materials. In addition, we provide some perspectives on further investigation of novel thermal properties in quantum materials.
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Rodríguez-Rodríguez, Fernando, Carlos Cristi-Montero, and José Castro-Piñero. "Physical Activity Levels of Chilean Children in a National School Intervention Programme. A Quasi-Experimental Study." International Journal of Environmental Research and Public Health 17, no. 12 (June 23, 2020): 4529. http://dx.doi.org/10.3390/ijerph17124529.
Abstract:
Background. Recess is a great opportunity to interrupt sedentary behaviour and increase moderate-to-vigorous physical activity (MVPA) in schoolchildren. This quasi-experimental study aimed to compare the levels of physical activity (PA) during the school day of children in a school intervention programme vs. those in a control group, and to determine compliance with MVPA recommendations. Methods. A sample of 154 schoolchildren (6–12 years old) was obtained from several schools (70 with the intervention and 84 controls). This programme was structured with a duration of 90 min/session and performed three times/week. PA levels were recorded with triaxial accelerometers during the school day: during recess, during a PA session or physical education session (PE), and during lunchtime. No pre-intervention evaluation was performed. Results. The MVPA of the control group was higher than that of the intervention group during the first recess (p < 0.001). None of the groups complied with the recommendations for steps during the PA or PE sessions. During the PA session, sedentary time was lower and MVPA was higher, in the intervention group than in the control group. Fifty percent of the children from the intervention group complied with the MVPA recommendations, vs. 22.7% of those in the control group. Conclusions. The schoolchildren in the intervention group performed more MVPA than those in the control group. Future interventions could include other periods, such as recess and lunchtime, which are opportunities for improving the MVPA levels of schoolchildren.
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Sergeev, M. B., V. A. Nenashev, and A. M. Sergeev. "Nested code sequences of Barker — Mersenne — Raghavarao." Information and Control Systems, no. 3 (June 21, 2019): 71–81. http://dx.doi.org/10.31799/1684-8853-2019-3-71-81.
Abstract:
Introduction: The problem of noise-free encoding for an open radio channel is of great importance for data transfer. The results presented in this paper are aimed at stimulating scientific interest in new codes and bases derived from quasi-orthogonal matrices, as a basis for the revision of signal processing algorithms.Purpose: Search for new code sequences as combinations of codes formed from the rows of Mersenne and Raghavarao quasi-orthogonal matrices, as well as complex and more efficient Barker — Mersenne — Raghavarao codes.Results: We studied nested code sequences derived from the rows of quasi-orthogonal cyclic matrices of Mersenne, Raghavarao and Hadamard, providing estimates for the characteristics of the autocorrelation function of nested Barker, Mersenne and Raghavarao codes, and their combinations: in particular, the ratio between the main peak and the maximum positive and negative “side lobes”. We have synthesized new codes, including nested ones, formed on the basis of quasi-orthogonal matrices with better characteristics than the known Barker codes and their nested constructions. The results are significant, as this research influences the establishment and development of methods for isolation, detection and processing of useful information. The results of the work have a long aftermath because new original code synthesis methods need to be studied, modified, generalized and expanded for new application fields.Practical relevance: The practical application of the obtained results guarantees an increase in accuracy of location systems, and detection of a useful signal in noisy background. In particular, these results can be used in radar systems with high distance resolution, when detecting physical objects, including hidden ones.
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Frantík, Petr, Zbyněk Keršner, Václav Veselý, and Ladislav Řoutil. "Fractality of Simulated Fracture." Key Engineering Materials 409 (March 2009): 154–60. http://dx.doi.org/10.4028/www.scientific.net/kem.409.154.
Abstract:
The paper is focussed on numerical simulations of the fracture of a quasi-brittle specimen due to its impact onto a fixed rigid elastic plate. The failure of the specimen after the impact is modelled in two ways based on the physical discretization of continuum: via physical discrete elements and pseudo-particles. Advantages and drawbacks of both used methods are discussed. The size distribution of the fragments of the broken specimen resulting from physical discrete element model simulation follows a power law, which indicates the ability of the numerical model to identify the fractal nature of the fracture. The pseudo-particle model, on the other side, can successfully predict the kinematics of the fragments of the specimen under impact failure.
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Zhu, Hua, and Hui Han. "Charge density wave in low dimensional materials." Journal of Physics: Conference Series 2338, no. 1 (September 1, 2022): 012028. http://dx.doi.org/10.1088/1742-6596/2338/1/012028.
Abstract:
Abstract Charge density wave(CDW) is an important physical phenomenon and has always been one of the significant research contents in condensed matter physics. The study of CDW helps people to have a deeper understanding of the interactions between various particles in low-dimensional systems. At the same time, the control of CDW in the material can effectively control the physical properties such as superconductivity. The study of CDW originated from one-dimensional and quasi-one-dimensional materials. This paper introduces the origin of CDW and the main formation mechanism of CDW at this stage. Discuss the common regulation methods of CDW and the competitive relationship with other physical properties. Finally, the possible research directions in related fields and the potential applications of CDW are prospected.
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Putra, Muhamar Kodafi, Adhe Saputra, Eko Kuntarto, and Sofyan. "Comparing the effects of hybrid and online learning on physical activity and body mass index: A quasi-experimental investigation." Edu Sportivo: Indonesian Journal of Physical Education 4, no. 2 (August 3, 2023): 127–35. http://dx.doi.org/10.25299/es:ijope.2023.vol4(2).13253.
Abstract:
Changes in learning methods at school can affect students' learning habits and activity patterns. This study aims to investigate the effect of hybrid learning compared to online learning on fitness level and body composition, specifically focusing on body mass index (BMI). The research method used was a quasi-experiment with a pretest-posttest control group design approach. The number of research subjects was 128 students with an average age of 10.35 ± 0.67 years, a body weight of 42.05 ± 8.97 kg, and a height of 142.84 ± 7.94 cm. The results showed that the post-test BMI score in the hybrid learning group decreased significantly, p < 0.05, by 19.69 kg/m2, and there was an increase in physical activity of 2.94 METs. Whereas in the online learning group, there was no significant difference in BMI or physical activity variables. The results of this study are expected to be a reference for teachers in schools and other educators to apply the hybrid method compared to online learning so that students' physical activity patterns can be maintained and continuously improved, which has an impact on body composition. The findings can also help in reducing physical activity patterns in big cities on the island of Sumatera and can be a discussion for researchers to create or modify more effective and efficient learning methods.
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Pakaya, David, and Eka Mutiara Herman. "PERBANDINGAN AKTIVITAS FISIK JENIS AEROBIK DAN ANAEROBIK TERHADAP KADAR HIGH DENSITY LIPOPROTEIN (HDL)." Healthy Tadulako Journal (Jurnal Kesehatan Tadulako) 9, no. 2 (May 31, 2023): 218–23. http://dx.doi.org/10.22487/htj.v9i2.737.
Abstract:
Physical activity is classified based on biochemically process of energy shynthesis into aerobic and anaerobic physical activity. These activities has the ability to increase the High Density Lipoprotein (HDL) on body. The aim of this study is to determine the comparison between aerobic and anaerobic physical activity on HDL levels. This is a quasi experimental research with pre and post test design. This study partisipant used purposive sampling methods, totally 60 individuals, were divided into two groups, that is aerobic physical activity group and anaerobic physical activity group. Data of HDL levels were perform used Cholesterol Oxidase – Peroxidase Aminoantypirin (CHOD-PAP) methods. Data as a pair for measured the increased of HDL leves in two groups and analyzed with GrapPhad Prism 8.0.0 used the Unpaired t-test. In This study we found hhe HDL levels on the aerobic and anaerobic physical activity showed a significant increased (p<0,0001). The comparison on HDL levels between aerobic and anaerobic physical activity showed a non-significant difference (p=0,7740). in the conclusion, The aerobic and anaerobic physical activity has effect on increased the HDL levels, but has no difference when compared between the aerobic and anaerobic physical activity on increased HDL levels.
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Kadari, Devaraju, Gadiraju Padmaja, and Binod Rajak. "Distress and Quality of Life among Type II Diabetic Patients: Role of physical activity." Asia Pacific Journal of Health Management 16, no. 1 (February 28, 2021): 64–74. http://dx.doi.org/10.24083/apjhm.v16i1.569.
Abstract:
This study measures the distress and Quality of Life (QoL) among people with type II diabetics in relation to physical exercise. The study was conducted using diabetic participants chosen from various hospitals, aerobic centres, playgrounds and gyms in the city of Hyderabad in India. The participants were divided into two groups – group 1 comprising people who did not adopt physical activity as part of their diabetes management strategy and group 2 comprising people who engaged in physical activity. A quasi-experimental study was performed on both groups employing purposive and snowball sampling methods. Pearson r showed that distress is negatively correlated with QoL among type II diabetics in both groups. Independent t-test indicated that participants in group 2 showed better QoL and lower levels of distress compared to their counterparts in group 1.
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Parada Flores, Bastián, Pablo Luna-Villouta, Cristian Martínez Salazar, Jorge Flández Valderrama, Luis Valenzuela Contreras, Carol Flores-Rivera, and Rodrigo Vargas-Vitoria. "Physical Exercise Methods and Their Effects on Glycemic Control and Body Composition in Adults with Type 2 Diabetes Mellitus (T2DM): A Systematic Review." European Journal of Investigation in Health, Psychology and Education 13, no. 11 (November 5, 2023): 2529–45. http://dx.doi.org/10.3390/ejihpe13110176.
Abstract:
The prevalence of T2DM represents a challenge for health agencies due to its high risk of morbidity and mortality. Physical Activity (PA) is one of the fundamental pillars for the treatment of T2DM, so Physical Exercise (PE) programs have been applied to research their effectiveness. The objective of the study was to analyze the effects of PE methods on glycemic control and body composition of adults with T2DM. A systematic review without meta-analysis was performed, using the PubMed database. Quasi-experimental and pure experimental clinical trials were included, which were available free of charge and were published during 2010–2020. In the results, 589 articles were found and 25 passed the inclusion criteria. These were classified and analyzed according to the methods identified (AE, IE, RE, COM, and others), duration and variable(s) studied. It is concluded that PE is effective for glycemic control and body composition in adults with T2DM using different methods (AE, IE, RE, COM, and others), both in the short and long term. Adequate organization of PE components such as frequency, duration, volume, and intensity, is essential.
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Alwama, Hussein Ali Mohammed, and Amin Dakhalalah Abdallah Albdour. "The Effect of Using (Microsoft Teams) to Teach the Physical and Health Education Teaching Methods Course on the Achievement of Al-Hussein Bin Talal University students and their Acquisition of Reflective Thinking Skills." Dirasat: Educational Sciences 50, no. 1 (March 15, 2023): 469–84. http://dx.doi.org/10.35516/edu.v50i1.4615.
Abstract:
Objectives: This study aimed to identify the effect of using the distance learning platform (Microsoft Times) to teach the physical and health education methods course on each of the study variables, namely: the achievement of Al-Hussein Bin Talal University students, and the students' acquisition of reflective thinking skills.
Methods: The study used the quasi-experimental approach by selecting two divisions from the Physical and Health Education Teaching Methods course and distributing them randomly into two experimental and control groups. The study used an achievement test and a reflective thinking test.
Result: In light of the statistical analysis, the results showed a statistically significant effect in the dimensional measurement of using the distance learning platform (Microsoft Teams) to teach the Physical and Health Education Teaching Methods course on the achievement and acquisition of reflective thinking skills by the students of Al-Hussein Bin Talal University, in favor of the students of the experimental group.
Conclusions: In light of the results of the study, a number of recommendations were reached, the most important of which are: using the distance learning platform in university teaching and in other study courses.
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Филатова, D. Filatova, Карпин, Vladimir Karpin, Еськов, Valeriy Eskov, Башкатова, and Yuliya Bashkatova. "Statistical and evaluation chaotic parameters under cardio exertion." Complexity. Mind. Postnonclassic 4, no. 2 (September 25, 2015): 5–10. http://dx.doi.org/10.12737/12005.
Abstract:
Methods of classical statistics and the theory of chaos and self-organization studied the behavior of the vector of the cardiovascular system in groups of students trained and untrained in response to dosed physical stress .It was found that students without physical fitness indicators of cardio area quasi-attractors increased after exercise . The study had shown significant changes in the dynamics of the behavior of the parameters of functional systems of the human body compared to the stochastic approach based on the histogram and Shannon entropy . It is shown the feasibility of application of chaos theory, self-organization in the evaluation of the reaction of the cardiovascular system of the person on the dynamic exercise. As a measure of the cardiovascular system of the person (to load and after the load) used quasi-attractor motion of the state vector of the system in the two-dimensional phase space of states. Within the framework of the theory of chaos and self-organization may determine the parameters of the spacecraft for individual subjects and their groups to compare their chaotic dynamics in time or in the phase space of states.
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Берестин, D. Berestin, Попов, Yuriy Popov, Вохмина, Yu Vokhmina, Хадарцева, and K. Khadartseva. "Possibilities of stochastic processing of system parameters with chaotic dynamics." Complexity. Mind. Postnonclassic 3, no. 2 (May 21, 2014): 59–67. http://dx.doi.org/10.12737/5519.
Abstract:
The paper presents the first attempt to combine methods of stochastics (mathematical statistics) and methods of theory of chaos and self-organization for studying such complex (chaotic) processes as postural tremor. It was established that when re-registering tremor in each subject by n=15 or n=30 obtained tremorograms do not exhibit normal distribution, and non-parametric distributions show distinctions at pairwise comparison on Wilcoxon test (only 2 or 3 pairs from 210 may belong to the same general population). Static physical load sharply changes this picture and the number of such ("similar") pairs increases. The estimation method for effect of a load on tremor is proposed. Simultaneously, within calculating quasi-attractors there is a clear picture of division of chaotic dynamics of tremor parameters with load and without load. Prospects of a new method application in physiological measurements are discussed. Limited method of stochas- tics in description of complexity is underlined, and necessity of calculation quasi-attractor´s parameters in phase space of state is proved.