bluuebunny/crossref_metadata_2025_split huggingface dataset:
Analysis of the learning of electrostatic concepts in pre-service physics teachers
Authors: Garrido N , López V , Pintó R 
Published: August 2019

Abstract
The objective of this work is to analyze the explanations of pre-service physics teachers, when they experience with different electrostatic phenomena included in a teaching and learning sequence (TLS). This TLS was designed for students to use the model of distribution and interaction between electric charges at first, for then promote that they explain certain more complex phenomena with the electric field model. The results show a significant improvement of the students’ explanations throughout the TLS due to several factors, including the teacher’s role.
Discovery Cycle as Strategy of Science Teaching
Authors: Hernández Alejandro González y , Segarra Alberú María del Pilar 
Published: August 2019

Abstract
The discovery cycle is a strategy for reaching the scientific knowledge trough of discovery. We are applying this strategy with physics students of Mechanics Laboratory of the first year of university. The cycle is focused on research the dynamical behaviors of mechanical systems modeled with Newton’s Laws. It consists of seven stages: exploration, experimentation, empirical modeling, theoretical modeling, numerical modeling, model results versus experiment and prediction. Students carry out this strategy in a specific context of a mechanics system. In this paper, we analyze this strategy with a group of 24 students in the study of the motion of an object, sliding on a tilted plane, and present the results we got in the application of this strategy.
A mesoscopic mechanical model of the surface tension and some simulation results
Authors: Battaglia Onofrio Rosario , Fazio Claudio 
Published: August 2019

Abstract
Drops of mercury do not spread on a surface. A metal paper clip can float on water. These phenomena are macroscopic manifestations of molecular interactions and can be explained in terms of surface tension. In this study, we discuss a simple mesoscopic mechanical model of the surface tension and the results of numerical fluid dynamics simulations implemented on the basis of it. We study the droplet formation without and with gravity when it can drop from a narrow hole like a trickling tap and finally the behaviour of free surface liquid in a vessel. Teachers and students can be able to study the surface tension by using the computer simulation as a “tool” for analysing and discussing the droplet and the liquid behaviour in several different conditions.
Introducing an innovative approach of teaching the Standard Model of particle physics at high school
Authors: Lindenau Philipp , Kobel Michael 
Published: August 2019

Abstract
The role that is assigned to elementary particle physics in high school education differs all over the world. Even within a single country like Germany there are major differences in the depth of discussion. To help teachers to address the fundamental concepts of elementary particles and their interactions and to reduce the subject didactically with respect to the given general conditions, Netzwerk Teilchenwelt has developed teaching material with an innovative didactic spiral approach that points out connections to common contents of physics curricula and is focused on the fundamental interactions of the Standard Model of particle physics and the charges that generate them. This concept is being presented and discussed during in-service trainings for teachers all over Germany. Since 2017, roughly 290 teachers have been trained in at least two-day courses and enabled to teach this approach.
3D-vision lab @ Open Labs Graz, an out-of-school learning environment
Authors: Krumphals I , Haagen-Schützenhöfer C , Jungwirth H 
Published: August 2019

Abstract
Vision and three-dimensional perception have always been an integral part of our everyday life. The commercial availability of 3D-technology makes it easy for everybody to perceive 2D-objects like photos and films three-dimensional. Consequently, 3D-vision is part of most students’ everyday life. As known from the PISA-study, Austrian students have a low value in motivation for science. The topic of 3D-vision is related to human body and therefore, as known from the ROSE study, it should be equally interesting for male and female students. Based on these assumptions, a first version of an out-of-school learning environment at the Open Labs Graz covering the topic of 3D-vision was designed and evaluated with two 11 year classes (n = 32). We found mediocre to rather high values of intrinsic motivation as well as differences between male and female students.
Universal Arduino-based experimenting system to support teaching of natural sciences
Authors: Gingl Z , Mellár J , Szépe T , Makan G , Mingesz R , Vadai G , Kopasz K 
Published: August 2019

Abstract
The rapid evolution of intelligent electronic devices makes information technology, computer science and electronics strongly related to the teaching of natural sciences. Today almost everybody has a smart phone that can convert light, temperature, movement, sound to numbers, therefore all these can be processed, analysed, displayed, stored, shared by software applications. The fundamental question is how education can follow this knowledge and how can education take its advantages. Components and methods of modern technology are available for education also, teachers and students can play with parts and tools which were previously used only by engineers. A good example is the very popular Arduino board which is practically an industrial microcontroller whose pins are wired to easy-to-use connectors on a printed circuit board. In this paper we show a universal system which we have developed for the Arduino platform to support experimenting and understanding of the most fundamental principles of the operation of modern devices. We show our related educational concept and discuss the most important features of the system. Open source hardware and software are available and we provide a number of video tutorials as well.
Physics experiments using simultaneously more than one smartphone sensors
Authors: Monteiro M , Stari C , Cabeza C , Martí A C 
Published: August 2019

Abstract
In the last years, numerous Physics experiments using smartphone sensors have been reported in the literature. In this presentation we focus on a less-explored feature of the smartphones: the possibility of using (measure and register data) simultaneously with more than one sensor. To illustrate, in the field of mechanics simultaneous use of the accelerometer and gyroscope (angular velocity sensor) or in optics experiments synchronous use of the ambient light and orientation sensors have been proposed. Indeed, this is a characteristic that simplifies experimental setups allowing to see through the physics concepts and, last but not least, reducing the costs.
Physicists’ conceptions about the nature of theoretical physics
Authors: Heine Antje 
Published: August 2019

Abstract
Scientists’ conceptions of their discipline give interesting insights in authentic scientific practice. The existing studies about scientists’ view of nature of science are rare. Schwartz & Ledermann (2008) were not able to identify clear differences between the conceptions from scientists from several disciplines. Only the ones from theoretical physicists differ from the ones from other scientists. The aim of the current study is the reconstruction of conceptions from researchers in the field of physics about the nature of physics. Here the comparison between experimentally and theoretically working physicists is particularly interesting.
Simulation study on bubble motion in capillaries based on lattice boltzmann method
Authors: Wang Xinyu , Li Ruosong , Li Hanjun , Xu Yuanqing 
Published: August 2019

Abstract
The lattice Boltzmann method with mesoscopic properties can conveniently describe the interaction of multiphase molecules and has wide application prospects in the field of multiphase flow. In this paper, the improved Shan-Chen pseudo-potential multiphase model in lattice Boltzmann method was used to simulate the process of bubble passing through stenotic capillaries during the pathogenesis of decompression sickness, and the velocity variation of the fluid in the process of flow was studied. According to the research results, it can be concluded that: (1) in the direct channel, the velocity of the fluid slows down with the increase of the gas composition, and the clogging can cause a more obvious trend of deceleration; (2) in the narrow channel, the fluid velocity changes abruptly when the gas enters and leaves the narrow area, and with the increase of the gas composition, the velocity change tends to be stable when the gas can completely fill the narrow area. This research provides a theoretical basis for further understanding the pathogenesis of decompression sickness.
Combined Numerical and Experimental Investigation of the Cavitation and Erosion of Submerged Self-resonating Waterjet
Authors: Cui Lihua , Ma Fei , Cai Tengfei , Pan Yan , Liu Boshen , Qiu Linbin 
Published: August 2019

Abstract
In ocean exploitation of deep-sea mineral, cavitation always occurs. In this paper, a model based on the Rayleigh-Plesset equation for researching the cavitation of the self-resonating waterjet was build up. A three-dimensional Computational Fluid Dynamic (CFD) analysis method to demonstrate the possibly of using the pressure distribution phenomenon prediction the evolution of cavitation bubbles. Frequency bands of numerical simulations were in good agreement with experimental data. Based on this, we obtain the shedding frequency of the bubbles, researched the erosions effect. The results validate the proposed scheme, which could be used to adjust the erosions domains.
Exploration and study of fluid thrust vector nozzle
Authors: Xue Fei , Wang Huaqiang , Wang Yuchao 
Published: August 2019

Abstract
A fluid thrust vectoring nozzle model was established, and the numerical simulation was used to study the model and flow. When the control slot was closed at the same time, the control slot did not work and the main direction was in the central region. When the control slot opens at the same time, due to the influence of the mainstream low pressure, the outer air flow flows into the mainstream from the upper and lower air inlets respectively, and the mainstream flow increases slightly. The main flow will not deflect when the upper and lower air inlets are opened or closed at the same time, thus verifying the accuracy of the calculation model. When one side of the air inlet is opened and the other side of the air inlet is closed at the same time, the external gas flows into the mainstream from the open side of the air inlet and impacts the mainstream. As the mainstream is impacted asymmetrically, it deflects to the closed side of the entrance. Fluid thrust vectoring nozzle has the advantages of simple structure and high control efficiency.
Lattice Boltzmann study on drag reduction of a bluff body by slip boundary
Authors: Yang Liuming , Gao Yuan , Zhao Shuai , Yu Yang , Hou Guoxiang 
Published: August 2019

Abstract
Slip velocity at boundary will emerge when gas film or superhydrophobic coatings are applied to the surface. The no-slip boundary conditions are no longer efficient. In this work, an improved boundary treatment is proposed to obtain slip velocity. Numerical results of the Couette flow have verified the accuracy and reliability of the improved boundary condition. Taking into account the effect of boundary slip, the present research predicts the resistance of a bluff body under low Reynolds numbers using the lattice Boltzmann method. Results show that reasonable slip distribution may be favourable to the drag reduction effect.
Experiment and simulation on clam water taxiing of seaplane based on CFD
Authors: Zheng Xiaolong , Wu Bin , Wang Mingzhen , Tang Binbin 
Published: August 2019

Abstract
In order to verify the feasibility of STAR-CCM+ in handling the clam water taxiing problem of seaplane, capturing the kinetic characteristic of free surface by overlap mesh and Euler VOF method, and compare it with the experiment result. It shows that the simulation results are in good agreement with the experimental values, and the information of the flow field is well consistent with the actual phenomena. From qualitative and quantitative perspectives point of view, it is feasible to use STAR-CCM+ based on overlap mesh method to simulate the calm water taxiing of seaplane, a new method for predicting hydrodynamic performance of seaplane is provided.
Influence of velocity slippage on nonlinear shaft center trajectory of journal bearing
Authors: Chen Xiaochao , Jin Jian , Fu Yiyang 
Published: August 2019

Abstract
Reynolds equation considering boundary slippage was used to calculate the oil film pressure, and Euler method was used to establish the motion equation of the axis in the coordinate system to solve the acceleration, velocity and position coordinates of the axis. Due to the influence of velocity slippage, the oil film pressure increases with the increase of slippage length, thus increasing the oil film force, the vibration of the axis and aggravating the instability of the axis, but decreasing the rotational speed of vortex; the shaft center trajectory gradually moves down to reduce the maximum external bearing load. When the length-diameter ratio becomes large, the effect of slippage length on shaft center trajectory is gradually reduced.
Stability analysis of a class of non-newtonian fluids based on generalized vector variational-like inequalities on riemannian manifold
Authors: Deng Shuxian , Ge Xinxin 
Published: August 2019

Abstract
Fluid mechanics is a branch of mechanics. It is the science of studying fluid phenomena and related mechanical behaviors. So far, the mutual soaking and fusion between fluid mechanics and other disciplines have formed many branches, many physicists and Mathematicians are working on this aspect of research. The classical Newtonian fluid mechanics believe that in parallel flow, the shear force is proportional to the shear rate, and the proportional coefficient is called the viscosity coefficient. In recent years, with the increasing importance of non-Newtonian fluids, people have found that research on non-Newtonian flow is necessary. The variational inequalities based on Riemannian manifolds were first proposed by S.Z.Németh. S.Z.Németh studied the existence of solutions to variational inequalities on Hadamard manifolds. For the equivalence of non-differentiable vector optimization problems on Riemannian manifolds and generalized weak vector variational-like inequalities, we give some new conclusions.
Research and application of dust control technology based on long pressure and short pumping system in mechanized tunneling face of coal roadway
Authors: Chen Fang , Zhang Sheji , Ma Wei , Mo Jinming 
Published: August 2019

Abstract
In order to solve the problem of dust pollution in mechanized tunneling face, Master the best matching relationship between the long and forced ventilation and the dusting and short dust removal parameters in the working face, reducing the dust concentration of working flour to the maximum degree. This paper takes the high-yield dust comprehensive mining face of Wangjialing coal mine as the research background, by establishing CFD model, the effect of dust control on different axial and radial air out ratio of working face is compared, and the parameters range of effective dust control is obtained, and the actual application of the field is verified and analyzed in order to get the best matching parameters of the control dust removal process. The results show that, after increasing the dust control of the wall winder, a fresh air flow transparent wall along the wall of the tunnel is formed in the tail of the roadheader, the dust can be controlled in the area of the front of the work. When the ratio of the axial and radial air out is 1:3, the dust is controlled in the smaller area near working face, the dust control effect is the best. The total and respirable dust concentration of the driver’s position and the 5m position at the tail of the driving machine can be reduced to less than 26.1 mg/m3 and 12.7 mg/m3. The dust control efficiency is above 80%, the overall dust efficiency is up to 94%, the dust reduction effect is obvious, and reduces the occupational hazards of workers.
Solving fractional nonlinear partial differential equations by the modified Kudryashov method
Authors: Hao Menghan , Zhang Yanni , Pang Jing 
Published: August 2019

Abstract
There are more and more methods for transforming nonlinear partial differential equations into ordinary differential equations by using the traveling wave transform. In this paper, the modified Kudryashov method is used to use the new traveling wave transform, and the exact solution of the space-time fractional equal-width equation is obtained by means of symbolic computation. Search for solution of the equal-width equation becomes more direct and simple. It is also suitable for solving a large number of similar fractional-order nonlinear partial differential equations, the method provides a new idea for solving fractional-order nonlinear partial differential equations.
Resistance analysis of underwater towing cable based on overset grid
Authors: Liu Xianlong , Lin Zhengcheng , Jiang Aiguo , zhu Linyong 
Published: August 2019

Abstract
The method of overset grid is used to calculate the lift and drag of towing cable at various angles of attack. Compared with the past method, it effectively solves the problem of mesh distortion at high angles of attack. Overset grid is more effective, and most of the grids are formed by regular hexahedron, so the accuracy of calculation is more guaranteed. When calculating the special angle of attack, the cubic spline interpolation method is used to solve the problem.
Simulation study on the mass transport in PCL based on the ciliated dynamic system of the respiratory tract
Authors: Zhu Pengfei , Chen Duanduan , Xu Yuanqing 
Published: August 2019

Abstract
In this paper, a two-dimensional dynamic model of human respiratory cilia is established by immersed boundary-lattice Boltzmann method. In the model, periciliary liquid and mucus layer with different flow characteristics are considered, in which the non-Newtonian fluid in the viscous layer is described by Oldroyd-B model; the area between two layers is dynamically divided by a virtual membrane. By changing the cilium beat amplitude and the depth of periciliary liquid, this paper focuses on the removal of particle impurities by cilium beat. The results show that when the initial position is near the top of cilium, the particle tends to migrate upward to approach the mucus layer. However, if the initial position is near the middle or at lower part of the cilia, most of the particles will not be transferred to the vicinity of mucus layer by the swinging cilium. It is also found that by increasing the beat amplitude of cilia, particles are more likely to approach the mucus layer. By conducting this study, the migration of the particle in periciliary liquid is discussed in detail. The results are significant to help us to know the material transport law of human respiratory tract.
New Development of Flow Field Calibration in the 2.4 m Transonic Wind Tunnel
Authors: Chen Xuekong , Lin Xuedong , Zhang Lin , Liu Guangyuan , Wang Ruibo 
Published: August 2019

Abstract
For the purpose of improving the flow fields of CARDC’s 2.4 m transonic wind tunnel in accuracy, two types of calibrations have been done in this tunnel. One was designing and manufacturing a new centerline pipe in high quality to calibrate the centreline flow, obtaining the accurate Mach number correction relationships and helped to build up new flow fields in accuracy. The other was applying a cone-cylinder model to measure the symmetries of the longitudinal flow fields to simulate the testing articles’ movement in pitching zone. It helped to investigate the detailed information of this flow fields. Based on these, the flow fields in higher accuracy were built up in the full-span model test section. This article presents the method, the process and the results of the calibrations herein.
Simulation and Analysis of Flexible Piezoelectric Beam under Karmen Vortex Street Effect
Authors: Li Haining , Wang Haifeng , Sun Kaili , Guo Xiuyu 
Published: August 2019

Abstract
Recent years, researchers have gradually increased their research efforts on energy harvesters for low power applications. Among them, many piezoelectric energy harvesters have been widely used because of their simple structures, low energy consumption and easy miniaturization. In order to study the energy harvesting with a flexible piezoelectric beam deformed by vortex-induced vibration, this paper takes polyvinylidene fluoride as the piezoelectric beam, and relies on ANSYS simulation software, establishes a fluid-solid-piezoelectric three-field coupling model, and calculates the energy harvesting capacity of piezoelectric beam. The results show that the positive output voltage is 59.763V and the negative output voltage is -67.633V.
The effect of high temperature overalls on body temperature
Authors: Mao Jie 
Published: August 2019

Abstract
When working in a high temperature environment, people need to wear special clothing to avoid burns. High-temperature special clothing can avoid burns and greatly improve the safety of work. In order to design a special garment with high strength and heat insulation and low cost, we built a model by heat conduction equation to simulate the change of human body temperature at a certain temperature. By simulating the body temperature changes in the high temperature environment, it is judged whether the high temperature overalls meet the requirements.
Research on Free Jet Test Technology
Authors: Xu Kao , Zhu Xiaojun , Li Feng 
Published: August 2019

Abstract
Aerodynamic thermal ground test can not completely simulate flight conditions, and there is no simple and clear similarity criterion as aerodynamic test. In practical application, it is often to grasp the local flow characteristics of materials or structures and use ground test equipment to simulate their main thermal environment parameters. Therefore, according to the thermal environment characteristics of different parts of the aircraft, a variety of arc heating test techniques have been developed. For example, free jet test technology has been developed for material test of simplified model and assessment test of small-scale components. It effectively solves some problems of thermal protection test examination.
Research Progress in Signaling Pathways That Regulate Life Span
Authors: Shi Yue , Ding Feng , Zhao Yan 
Published: August 2019

Abstract
Aging is a complex multifactorial biological process shared by all living organisms. It shows a gradual decline in normal physiological function in a time-dependent manner. Various model organisms are used to study the mechanisms of aging, and important discoveries in this area have contributed to the development of new therapies for age-related diseases. In this review, we discuss the important signaling pathways that have been shown to affect longevity, including the insulin/insulin-like growth factor (IGF-1) signaling pathway, the target of rapamycin (TOR) signaling pathway, and the AMP-activated protein kinase (AMPK) signaling pathway, providing a basic understanding of the mechanisms of the aging process.