bluuebunny/crossref_metadata_2025_split huggingface dataset:
The relevance of whole or segmental body bioelectrical impedance phase angle and physical performance in adolescent athletes
Authors: Obayashi Hiromune , Ikuta Yasunari , Fujishita Hironori , Fukuhara Koki , Sakamitsu Tetsuhiko , Ushio Kai , Kimura Hiroaki , Adachi Nobuo 
Published: March 2021

Abstract

Objective. The physical condition of athletes can be assessed easily and quantitatively using objective indicators. Bioelectrical impedance measures the phase angle (PA), representing hydration and cell function, and is a potential clinical indicator of physical condition. This study aimed to investigate the association between PA and physical performance in adolescent athletes. Approach. Overall, 170 adolescent athletes underwent a sports medical check-up, including body composition measurements and physical performance tests. Whole-body and segmental PAs (arm and leg) were determined based on body composition values. Isometric grip power and knee isokinetic muscle strength were measured as parameters of muscle strength. Counter movement jump height and squat jump height were measured as jump parameters. Associations between PA and each muscle strength or jump parameters were analysed using Pearson product-moment correlation coefficient or Spearman’s rank correlation coefficient. Main results. Whole-body and upper limb PAs were highly correlated with grip power (r = 0.70–0.80). Whole-body and lower limb PAs were correlated with knee isokinetic muscle strength (r = 0.43–0.59). Whole and all segmental PAs were correlated with counter movement jump height (r = 0.46–0.57) and squat jump height (r = 0.42–0.52). Significance. PA can be used to monitor physical condition and sports performance in adolescent athletes. Segmental PAs can help assess the condition of the corresponding body part.
Sound modes in collisional superfluid Bose gases
Authors: Furutani K , Tononi A , Salasnich L 
Published: March 2021

Abstract
We theoretically investigate sound modes in a weakly-interacting collisional Bose gas in D dimensions. Using the Landau’s two-fluid hydrodynamics and working within the Bogoliubov theory, we observe the hybridization of the first and second sound modes for D ⩾ 2. To model the recent measurements of the sound velocities in 2D, obtained in the weakly-interacting regime and around the Berezinskii–Kosterlitz–Thouless transition temperature, we derive a refined calculation of the superfluid density, finding a fair agreement with the experiment. In the 1D case, for which experimental results are currently unavailable, we find no hybridization, triggering the necessity of future investigations. Our analysis provides a systematic understanding of sound propagation in a collisional weakly-interacting Bose gas in D dimensions.
Insight into the chemomechanical coupling mechanism of kinesin molecular motors
Authors: Xie Ping 
Published: March 2021

Abstract
Kinesin is a two-headed biological molecular motor that can walk processively on microtubule via consumption of ATP molecules. The central issue for the molecular motor is how the chemical energy released from ATP hydrolysis is converted to the kinetic energy of the mechanical motion, namely the mechanism of chemomechanical coupling. To address the issue, diverse experimental methods have been employed and a lot of models have been proposed. This review focuses on the proposed models as well as the qualitative and quantitative comparisons between the results derived from the models and those from the structural, biochemical and single-molecule experimental studies.
Evaluation of silicon carbide as a divertor armor material in DIII-D H-mode discharges
Authors: Abrams T. , Bringuier S. , Thomas D.M. , Sinclair G. , Gonderman S. , Holland L. , Rudakov D.L. , Wilcox R.S. , Unterberg E.A. , Scotti F. 
Published: March 2021

Abstract
Silicon carbide (SiC) represents a promising but largely untested plasma-facing material (PFM) for next-step fusion devices. In this work, an analytic mixed-material erosion model is developed by calculating the physical (via SDTrimSP) and chemical (via empirical scalings) sputtering yield from SiC, Si, and C. The Si content in the near-surface SiC layer is predicted to increase during D plasma bombardment due to more efficient physical and chemical sputtering of C relative to Si. Silicon erosion from SiC thereby occurs primarily from sputtering of the enriched Si layer, rather than directly from the SiC itself. SiC coatings on ATJ graphite, manufactured via chemical vapor deposition, were exposed to repeated H-mode plasma discharges in the DIII-D tokamak to test this model. The qualitative trends from analytic modeling are reproduced by the experimental measurements, obtained via spectroscopic inference using the S/XB method. Quantitatively the model slightly under-predicts measured erosion rates, which is attributed to uncertainties in the ion impact angle distribution, as well as the effect of edge-localized modes. After exposure, minimal changes to the macroscopic or microscopic surface morphology of the SiC coatings were observed. Compositional analysis reveals Si enrichment of about 10%, in line with expectations from the erosion model. Extrapolating to a DEMO-type device, an order-of-magnitude decrease in impurity sourcing, and up to a factor of 2 decrease in impurity radiation, is expected with SiC walls, relative to graphite, if low C plasma impurity content can be achieved. These favorable erosion properties motivate further investigations of SiC as a low-Z, non-metallic PFM.
Analysis of Otha-Kawasaki Free Energy by Means of the Brazovskii Approach
Authors: Pezzutti A D , Hernández H 
Published: March 2021

Abstract
In this work, we developed the expansion of the Brazovskii type of Otha-Kawasaki free energy used in different condensed matter systems. This expansion makes it easy to evaluate the contributions of the terms of energy involved, usually referred to as short-range “double-well” potential and long-range. Thus, there is a powerful tool to explore and understand the dynamics of systems evolution out of equilibrium.
Study on High Temperature Oxidation Properties of Molybdenum-based Alloys
Authors: Bao Ziming , Han Renheng , Zhu Yanqing , Li Ning , Zhang Chi , Zhao Chengzhi , Zhang Hexin 
Published: March 2021

Abstract
Research and design of different components of molybdenum-cobalt alloy, including Mo-3Co alloy, Mo-6Co alloy, Mo-9Co alloy and pure molybdenum alloy. The weight loss of pure molybdenum alloy, Mo-3Co alloy, Mo-6 Co alloy and Mo-9Co alloy at 400 °C, 600 °C, 800 °C, 1000 °C after 1-hour oxidation was systematically analyzed. Observing the surface of the oxide layer, it was found that the Mo-6Co alloy was vigorously oxidized at 800 °C and 1000 °C to form volatile MoO3. As the cobalt content increased, the weight loss rate of the samples showed a downward trend at different oxidation temperatures. Granular oxides were formed when the Mo-6Co alloy sample was oxidized at 400 °C; when oxidized at 600 °C, scaly oxides were formed; when oxidized at 800 °C and 1000 °C, blocky or flaky oxides were formed. Addition of the element of cobalt can obviously alleviate the oxidation of molybdenum-based alloy specimens at high temperature.
Antecedents of continuance intention in e-campus system: The moderating effect of internet experience
Authors: Razak Fahmi Zaidi Abdul , Kasim Nur Muneerah Binti , Harun Siti Aminah Binti , Sulaiman Noor Suhani 
Published: March 2021

Abstract
This study applies internet experience as a moderator to investigate how the relationship between satisfaction and continuance intention is differ based on user experience. Analysis of 315 usable responses shows that internet experience plays a significant role in moderate the relationship. This empirical study employ quantitative survey as a research design. The data were analysed using the statistical package for data analysis SPSS 22 for Windows. This paper concludes with implications and limitations of the study.
The Relationship between Core Strength Performance with Sprint Acceleration
Authors: Afandi Mohamed Azizul Mohamed , Mohamad Nur Ikhwan , Fazila Nor , Malek Abd , Chinnasee Chamnan , Md Nadzalan Ali 
Published: March 2021

Abstract
The objectives of this study were to determine the relationship between average core strength and sprint acceleration performance. Besides that, this study also intended to determine the relationship between body height and body weight with average core strength and sprint acceleration performance. Sixty-three male sport science students (height 1.67 ± 0.07 m; body mass 63.25 ± 13.90 kg) from variety of sport background participated in this study. To test the relationship, core strength (7-stage abdominal strength test and prone-bridge test) and sprint acceleration (35-m sprint test) performance was measured and a Pearson’s correlation coefficient was used to analyse the results. Sprint was found to be significantly correlated with prone bridge performance, r (63) = -0.43, p = 0.00). The relationship between body height with sprint performance stated significant relationship (r (63) = -0.48, p = 0.00) and body weight with 7-stage abdominal strength values reveal a significant relationship (r (63) = - 0.28, p = 0.03). In conclusion, this finding has suggested an optimum core strength may influences sprint acceleration performance which would give greater advantages in order to improve physical performance or optimize sport performance.
Reliability and Validity of Badminton Special Speed Training Method toward Success Score and Time Perception Predictive Skills Performance of Badminton Players
Authors: Guo Su Zhan , Mohamad Nur Ikhwan , Zakaria Jaffry , Yu Lin , Malek Nor Fazila Abd 
Published: March 2021

Abstract
The aim of this study was to examine the validity and reliability of badminton special speed training method (BSSTM) test instrument on success score and time perception predictive skills performance among elite badminton players. Thirty elite badminton players had participated for the purpose of this study. Expert’s evaluation with content validity analysis were used to determine validity. Test-retest method were used to determine the reliability of the success score and the time perception predicting skill performance of badminton players. The BSSTM scoring sheets which consisted of three parts of assessment scoring methods (Part A, B and C) were evaluated part by part by experts. Participants also performed two separated yet similar testing sessions where the BSSTM scoring methods sheets used to evaluate their performance. Results of the analysis indicated high content validity for all Part A, B and C (α = .963, α = .956, α = 956 respectively) with high reliability also recorded (r = .953, r= .986, r= .974 respectively). In conclusion, the BSSTM and its scoring instruments is valid for badminton specific speed performance tests and reliable to be used. Badminton coaches and players may utilized BSSTM as a training method and performance monitoring tools in their periodized training program.
Implication of human skin temperature under high humidity to the construction workers’ by using computational thermal simulation
Authors: Ismail Ahmad Rasdan , Jusoh Norfadzilah , Makhtar Nor Kamilah , Zein Raemy Md , Rahman Ismail Abdul , Khamis Nor Kamaliana , Mohamad Darliana 
Published: March 2021

Abstract
Workers in construction are the most in danger to the poor health effects of heat exposure every day. A simulated lifting task based on computational thermal model of the workers in the construction is designed and utilized to study the distribution of skin temperature under two different temperatures (32°C and 25°C) and statics relative humidity at 70%. The thermal distribution and simulation for the temperature towards human/manikin body was designed by utilising ANSYS Simulation software. The Computational Fluid Dynamics (CFD) simulation revealed the detailed analysis of the thermal distribution around the body/manikin while conducting lifting activities. The CFD also indicated that case study (32 °C/70%) provided the significant physiological effect to the workers in the construction. The mean skin temperature in this case study is 34.7 °C. The heat index shows that when the human working in a hot climate, they had received significantly heat as high as the heat generated from their surrounding. This experiment concluded that skin temperature was influenced significantly by the tropical climate. This particular study provided potential exploration of the environment heat to the construction workers in Malaysia through the prediction of skin temperature.
A New De-Noising Method for Ground Penetrating Radar Signal
Authors: Ma YongMin , Jong YongGwang , Liu Yang 
Published: March 2021

Abstract
The de-noising of data has become the key problem of ground penetrating radar (GPR) research. In this paper, the de-noising method based on combination of complete ensemble empirical mode decomposition (CEEMD) and wavelet decomposition is proposed. By combining CEEMD and wavelet decomposition, the effective signal information can be extracted from the removed intrinsic mode function (IMF) components in de-noising based on CEEMD. Numerical simulation results show that the quality of the GPR signal can be obviously improved by using the combination method.
Research on Energy Efficiency Application of Wireless Communication Energy Saving and Emission Reduction Based on Self-organizing Network Game Technology
Authors: Bai Sijun , Zou Tao , Rong Xibai 
Published: March 2021

Abstract
Energy efficiency is a very important performance index in wireless ad hoc networks. So far, there is no universally accepted definition of the energy efficiency of self-organizing networks, and most of the conclusions drawn are asymptotic or qualitative, and its practicality is very limited. Aiming at this problem, a trust model based on game theory is proposed. The model introduces a time decay function to improve the accuracy and dynamic adaptability of trust evaluation, and introduces a node transaction density function in the recommendation trust calculation to calculate the recommendation performance of the recommended node. Reliability: In order to effectively encourage nodes to actively provide high-quality services and punish bad behaviour nodes, game theory is also introduced to analyse the trust value of nodes and decide whether to forward messages according to the analysis results. The simulation results show that the algorithm can adaptively deploy network nodes according to the distribution of task requirements, and quickly achieve the optimal layout.
Optimization Model Design for Temperature Curve of Reflow Furnace
Authors: Luo Xindi , Wang Zeshu , Deng Wenhao 
Published: March 2021

Abstract
How to adjust the temperature zone temperature and furnace speed parameters to optimize the furnace temperature curve, so as to improve the product quality is the main problem faced by the temperature curve optimization of the reflow furnace. In this paper, the heat transfer model is established by the heat convection and heat conduction equations, and the mechanism of temperature change in the welding area is analyzed. Then, by gradually determining the objective function and comprehensively establishing the optimization model according to the known conditions, the optimal parameters are solved, so as to solve the optimization problem of furnace temperature curve. According to Newton’s cooling law, specific heat theorem and Laplace equation, the temperature function of the center of the welding zone is deduced and solved, and the analytic function model of the temperature change in the center of the welding area can be obtained by synthesizing the inherent size conditions of the reflow furnace. Taking the corresponding data of experimental temperature and time as the fitting data, the undetermined parameters of the model were solved by nonlinear least square fitting method and undetermined coefficient method. The square sum of fitting residuals is 5857.7, which proves that the model has good fitting effect. Using the new experimental data to solve the model, the temperature change of the welding center at each position and time in the reflow furnace is analyzed. The temperature in the center of the welding area at the middle point of the low temperature zone 3, 6, 7 and the end of the small temperature zone 8 is 143.81°C, 181.78°C, 201.33°C, 228.97°C, respectively.
Research on Optimization of Sea Rice Biscuit Based on BP Neural Network
Authors: Han Rui , Wu Juxian , Shi Xiaoyan , Li Mingjun , Ye Shengquan 
Published: March 2021

Abstract
Sea rice is rich in dietary fiber and selenium, and has the characteristics of low fat and low calories. The main raw material of this paper is sea rice noodles. The sensory evaluation, chewiness and hardness of functional biscuits are the main inspection criteria. Through orthogonal experiments and the use of BP neural network modeling and prediction, the relationship between the three influencing factors of the model and sensory evaluation indicators Carry out modeling and predictive analysis to guide the optimization research of product formula and improve efficiency. The difference between the three predicted values and the actual indicators is small, which are - 0.0073%, -0.0091%, and 0.3225%, respectively, which have a good prediction effect.
The Wind Vibration Analysis of High-rise Isolated Structures Based on Linear Regression Filter Method
Authors: Wang Yong Hua , Yang Zhen 
Published: March 2021

Abstract
Vibration isolation is a fast developing structure vibration control technology.Due to its simplicity and effectiveness,it has been gradually applied to high-rise buildings in recent years,and high-rise isolated structures have a large effect of high-order vibration damping.Compared with high-rise aseismic structures,the period of high-rise isolated structures is larger,so the wind load effect is larger than that of high-rise aseismic structures.This paper on the damping effect analysis of structures under seismic action,to verify the rationality of the design of vibration isolation,and then by now a mature linear regression filter method to simulate the fluctuating wind,with the average wind speed into wind pressure time history input of high-level structure,to analyze the effect of structure under wind load,in the analysis of the structure of the base shear and top acceleration as investigation object,focus on the guarantee structure has a certain effect of shock absorption effect of wind vibration and its control.
Experimental study on compound phase change materials
Authors: Li Sasa , Xu Hong , Wang Wenhao 
Published: March 2021

Abstract
According to incomplete statistics, the mine heat damage accidents since the 1970s have threatened the safety of mining and the safety and health of underground workers all the time. At present, many mine workers have physical discomfort in high-temperature mines, and then affect the safe mining of mines. As China’s shallow coal seam has been basically mined out and gradually mined to deep mines, the underground heat damage is becoming more and more serious. The overall and local cooling of the mine has become a difficult problem in the underground work, which also restricts the production of the mine. The development of individual cooling equipment can effectively alleviate the heat stress of mine workers. Therefore, it is necessary to select non-toxic environmental protection and low-cost cooling materials as the cooling medium of cooling clothing. It is necessary to consider that the cooling medium is harmless to human body and can keep the human body working in a more comfortable micro environment without affecting the working efficiency.
Research on Vibration Characteristics of Propulsion Shafting Under Unbalanced-misaligned Coupling Fault
Authors: Xu Kai , Zhang Yuqing , Ming Tingfeng 
Published: March 2021

Abstract
Vibration characteristics under unbalanced-misaligned coupling fault of propeller shaft were studied. Firstly, the rigid-flexible mixing model of propeller shaft system test bench is established by using Solidworks and ADAMS. Then, the shafting vibration characteristics in time and frequency domain are obtained by simulation analysis under normal, unbalanced, misaligned and unbalanced-misaligned coupling faults. Finally, the influence of rotational speed on unbalanced-misaligned coupling fault shaft system is analysed. The simulation study shows that the vibration spectrum of shafting under unbalanced-misaligned coupling fault is mainly the superposition of the spectrum under each single fault, and the vibration caused by each fault is different in different locations. The increase of speed will aggravate the vibration of shafting.
Research on the Construction of Green and Environmental Protection Modern Gymnasium
Authors: Wei Zuotao 
Published: March 2021

Abstract
The lighting and air-conditioning of gymnasium buildings consume huge amounts of energy. How to make full use of natural lighting and natural ventilation is the key issue of energy conservation and environmental protection in gymnasium buildings. The paper focuses on the main energy-saving measures of sports buildings, from the building form factor and window-to-wall ratio, the thermal parameters of the envelope structure, the construction method of the envelope structure, the energy-saving design of the air conditioning system, and the energy-saving design of the building electrical system. Analysing and discussing the water-saving design of buildings and other aspects, it provides beneficial practical experience for the development of sports buildings in the direction of environmental protection and ecology.
Launching system of helicopter aviation transient electromagnetic system
Authors: Mingren Shen 
Published: March 2021

Abstract
Aviation electromagnetic transmitters are used to ascertain the distribution and reserves of underground mineral resources. Among them, the launch subsystem is used as the energy source of helicopter aviation transient electromagnetic exploration equipment, and its performance will have a great impact on the exploration depth and accuracy of mineral resources. The structure and principle of the power conversion circuit of the transmitting subsystem are introduced. Complete the production of the power conversion circuit, and complete the test of several main performance indicators of the circuit. Laboratory test results show that the power conversion circuit has good performance and meets the design requirements.
China’s One Belt, One Road Strategy Research in Accordance with Globalization Trends
Authors: Zhu Yuting 
Published: March 2021

Abstract
"One belt, one road" construction conforms to the trends of world economic globalization, and also meets the requirements of the development of global governance system. "One belt, one road" has improved the circulation of commodities, funds, technology and personnel among countries, expanded the mutual interests between countries, and opened up new space for the development of the country.
Detection Method of Ship Target Infrared Polarization Image
Authors: Tuo Haonan , Shi Guochuan , Luo Xiaolin 
Published: March 2021

Abstract
In the face of complex background and severe weather environment, infrared polarization detection has obvious advantages. In this paper, the ship target detection method based on infrared polarization image is studied and the ship target infrared polarization image detection method based on local contrast is proposed. The ship target detection accuracy of the proposed algorithm is 0.956, and the false alarm rate of the ship detection is low, which verifies the effectiveness of the detection algorithm in detecting the ship target, which has great application value in military applications.