scholarly journals Understanding the importance of service in the beach volleyball game

2021 ◽  
Vol 14 (1) ◽  
pp. 12-20
Author(s):  
Gabriel Alexandru PETROVICI ◽  
◽  
◽  
Keyword(s):  
Motor Skill ◽  
High Performance ◽  
Technical Procedure ◽  
Two Phases ◽  
Main Ideas ◽  
Great Mass

Beach volleyball is a practical sports game practiced both by the high-performance athlete and the great mass of lovers of movement, for recreational purposes, of lousier. In recent years, an increasing number of participants and tournaments have led to several studies on beach volleyball. Beach volleyball is divided into two phases: defense and counterattack. The sequence of beach volleyball actions is service, taking over, lifting, attacking, blocking, and diving. The defense phase includes: taking over, lifting, and attacking. Counterattack includes: blocking, defending, lifting, and attacking. This research tries to identify beach volleyball's fundamental characteristics and highlights the main ideas regarding this critical skill in beach volleyball. This technical procedure was and will be one of the most important in the volleyball game - both beach and indoor. Beach volleyball service is a specific motor skill commonly described as the first element of defense, essential to prevent a team from getting the side-out.

scholarly journals On the preparation and properties investigations of highly performant MXene (Ti3C2(OH)2) nanosheets-reinforced phthalonitrile nanocomposites

2019 ◽  
Vol 28 ◽  
pp. 2633366X1989062 ◽  
Author(s):  
Mehdi Derradji ◽  
Djalal Trache ◽  
Abdelkhalek Henniche ◽  
Abdeljalil Zegaoui ◽  
Aboubakr Medjahed ◽  
...  
Keyword(s):  
Polymer Composites ◽  
High Performance ◽  
Electron Microscopies ◽  
Morphological Studies ◽  
Reinforced Polymer ◽  
Fiber Reinforced Polymer Composites ◽  
Transmission Electron ◽  
High Performance Polymer ◽  
Two Phases ◽  
New Generation

Taking into consideration the latest advances in both ceramic and polymer fields, a new generation of high-performance polymer composites based on the state-of-the-art MXene (Ti3C2(OH)2) ceramics and one of the leading high-performance thermosets, namely the phthalonitrile resins, is presented. The synergistic combination between the two phases led to nanocomposites exhibiting an outstanding thermal stability with starting decomposition temperatures not less than 484°C for 3 wt% of nanoloading. The tensile properties were as high as those obtained with fiber-reinforced polymer composites. For instance, the tensile strength reached its highest value of 276 MPa for the maximum loading of 3 wt%. The morphological studies carried out by scanning and transmission electron microscopies corroborated the improvements of the thermal and mechanical properties. Undoubtfully, such materials expected to be used in extreme conditions can be seen as the next generation of ceramics-reinforced polymer composites.

scholarly journals IDEA OF ARCHITECTURE OF A MULTIPROCESSOR COMPUTER M-10 AND THEIR IMPLEMENTATION IN MODERN COMPUTING PLATFORMS (IN SMALL FORMS)

2019 ◽  
pp. 28-31
Author(s):  
E. V. Glivenko ◽  
S. А. Sorokin ◽  
G. N. Petrovа
Keyword(s):  
Parallel Processing ◽  
High Performance Computing ◽  
High Performance ◽  
Multiprocessor Computer ◽  
M 10 ◽  
Operator Type ◽  
Computing Platforms ◽  
Main Ideas ◽  
New Generation ◽  
Performance Computing

The article is devoted to the design of high‑performance computing devices for parallel processing of information. The problem of  increasing the productivity of computing facilities by one or several orders of magnitude is considered on the example of the high‑ performance electronic computer M‑10, which was created in the 1970s at the NIIVK. If in a conventional computer, the method  of processing numbers is given by commands, then in M‑10, the methods for processing a function were specified by operators  taken from functional analysis. At the same time, the possibility of parallel processing of an entire information line appeared. Such  systems began to be called «functional operator type machines». The main ideas presented in the article may be of interest to  developers of specialized machines of the new generation, as well as engineers involved in the creation of high‑performance  computing devices using technologies of computing platforms.

scholarly journals Post-KR interval in learning a discrete motor skill in children

1969 ◽  
Vol 6 (1) ◽  
Author(s):  
Elaine C. Bernardo da Silva ◽  
Taysa K. Vieira Guimarães ◽  
Rebeca Lopes Trindade ◽  
Aline K. Maria de Siqueira ◽  
Natália Barros Beltrão ◽  
...  
Keyword(s):  
Motor Skill ◽  
Absolute Constant ◽  
The Self ◽  
Short Intervals ◽  
Adaptive Process ◽  
Discrete Task ◽  
Research Questions ◽  
Two Phases ◽  
Measure Of Performance ◽  
Positive Effect

The aim of this study was to test the post-KR interval in the learning of a motor skill. The sample was constituted of thirty children, from 9 to 10 years old, distributed in three groups: G1 had post-KR interval free; G2 - received KR and after 5s started the next trial; and G3 - received KR and after 10s started the next trial; the verbal KR on the direction and magnitude of the error was given to the end of all the attempts. The task was to throw metal discs in a target arranged horizontally on a table, throughout two phases: acquisition (60 trials) and adaptation (10 trials). The measure of performance were the absolute, constant and variable error. The research questions were if very short intervals of post-KR may be do not benefit the adaptive process of the acquisition of skills, and if the control of the interval post-KR practiced by the learner himself could have positive effect in this process. The results suggested that the self-controlled post-KR interval can facilitate the learning of a discrete task in children.

Semantic Service Search in IT Crowdsourcing Platform: A Knowledge Graph-Based Approach

2020 ◽  
Vol 30 (06) ◽  
pp. 765-783
Author(s):  
Qinyue Wu ◽  
Duankang Fu ◽  
Beijun Shen ◽  
Yuting Chen
Keyword(s):  
Domain Knowledge ◽  
High Performance ◽  
Knowledge Graph ◽  
Search Performance ◽  
It Services ◽  
It Service ◽  
User Query ◽  
Service Information ◽  
Semantic Service ◽  
Main Ideas

Understanding user’s search intent in vertical websites like IT service crowdsourcing platform relies heavily on domain knowledge. Meanwhile, searching for services accurately on crowdsourcing platforms is still difficult, because these platforms do not contain enough information to support high-performance search. To solve these problems, we build and leverage a knowledge graph named ITServiceKG to enhance search performance of crowdsourcing IT services. The main ideas are to (1) build an IT service knowledge graph from Wikipedia, Baidupedia, CN-DBpedia, StuQ and data in IT service crowdsourcing platforms, (2) use properties and relations of entities in the knowledge graph to expand user query and service information, and (3) apply a listwise approach with relevance features and topic features to re-rank the search results. The results of our experiments indicate that our approach outperforms the traditional search approaches.

Overview of FGM Research in Japan

MRS Bulletin ◽  
1995 ◽  
Vol 20 (1) ◽  
pp. 19-21 ◽  
Author(s):  
M. Koizumi ◽  
M. Niino
Keyword(s):  
Thermal Stress ◽  
High Performance ◽  
Large Temperature ◽  
Functionally Gradient Materials ◽  
Optimum Distribution ◽  
Gradient Materials ◽  
Heat Resistant ◽  
Functionally Gradient ◽  
Composition Structure ◽  
Two Phases

Space planes require high-performance heat-resistant materials which can withstand ultrahigh temperatures and extremely large temperature gradients. To meet these needs, functionally gradient materials (FGMs) were proposed about 10 years ago in Japan.Figure 1 shows a conceptual diagram of functionally gradient materials, taking into account the relaxation of thermal stress. For the surface that contacts high-temperature gases at thousands of degrees, ceramics are used to provide adequate heat resistance. For the surface that provides cooling, metallic materials are used to furnish the necessary thermal conductivity and mechanical strength. In addition, the composition of these materials is formulated to provide optimum distribution of composition, structure, and porosity to effectively relax thermal stress.Since fiscal 1987, an R&D project entitled “Research on Fundamental Techniques to Develop Functionally Gradient Materials for Relaxation of Thermal Stress,” which aimed to develop ultra heat-resistant materials, had been carried out with special coordination funds from the Science and Technology Agency. The five-year project had two phases; Phase I was carried out from 1987 to 1989, and Phase II from 1990 to 1991.

scholarly journals Recent Progress in Two-Dimensional MoTe2 Hetero-Phase Homojunctions

Nanomaterials ◽  
2021 ◽  
Vol 12 (1) ◽  
pp. 110
Author(s):  
Jing Guo ◽  
Kai Liu
Keyword(s):  
High Performance ◽  
Recent Progress ◽  
Field Effect Transistors ◽  
Metallic Phase ◽  
Research Field ◽  
Two Dimensional ◽  
Small Energy ◽  
Potential Applications ◽  
Clean Interface ◽  
Two Phases

With the demand for low contact resistance and a clean interface in high-performance field-effect transistors, two-dimensional (2D) hetero-phase homojunctions, which comprise a semiconducting phase of a material as the channel and a metallic phase of the material as electrodes, have attracted growing attention in recent years. In particular, MoTe2 exhibits intriguing properties and its phase is easily altered from semiconducting 2H to metallic 1T′ and vice versa, owing to the extremely small energy barrier between these two phases. MoTe2 thus finds potential applications in electronics as a representative 2D material with multiple phases. In this review, we briefly summarize recent progress in 2D MoTe2 hetero-phase homojunctions. We first introduce the properties of the diverse phases of MoTe2, demonstrate the approaches to the construction of 2D MoTe2 hetero-phase homojunctions, and then show the applications of the homojunctions. Lastly, we discuss the prospects and challenges in this research field.

Influence of Blade Pitch and Number of Blades of a Pump Inducer on Single and Two-Phase Flow Performance

2020 ◽  
Author(s):  
Michael Mansour ◽  
Trupen Parikh ◽  
Dominque Thévenin
Keyword(s):  
High Performance ◽  
Two Phase Flow ◽  
Low Flow ◽  
Phase Flow ◽  
Flow Conditions ◽  
Two Phase ◽  
Phase Mixing ◽  
Part Load ◽  
Two Phases ◽  
Load Conditions

Abstract This study investigates the influence of various inducer configurations upstream of a pump impeller on the single and two-phase flow performance. Three pitch values (P = 0.151, 0.251, and 0.351 m), as well as three different numbers of blades (N = 2, 3, and 4 blades), were studied, leading to a total of 9 different inducer geometries. The main objective of the present study is to analyze and compare the corresponding performances and the two-phase mixing behavior, which is necessary for improving the two-phase pumping ability. 3D steady-state simulations using the Moving Reference Frame (MRF) approach were applied for single-phase flow, while a transient setup using a moving-mesh approach was employed for two-phase simulations. Turbulence was modeled by the Reynolds Stress Model (RSM), whereas the Volume of Fluid (VOF) method was applied to model air-water interactions. The results show that the increase in the number of blades leads to a high performance drop at overload (high-flow) conditions, but only to a slight performance enhancement at part-load (low-flow) conditions. Additionally, the effective flow range of the inducer corresponding to high efficiency becomes narrower for a higher number of blades. Concerning the inducer pitch, at part-load conditions, a lower pitch is slightly beneficial to smoothly suck the flow and damp the low-flow vortices; employing a high pitch at these conditions results in intensified flow vortices, reducing slightly the performance. On the other hand, the blade pitch is very influential for the performance at optimal and overload conditions, where a lower pitch causes flow blockage, leading to significant performance deterioration and a very limited range of applications. Generally, it was found that a modification of the inducer configuration affects the performance much more at overload compared to part-load conditions. Concerning two-phase mixing performance, the highest pitch provides the best mixing since the inducer is able to effectively churn the two phases. Similarly, an increase in the number of blades amplifies the turbulence between the two phases, thus improving mixing. Overall, a higher inducer pitch and a low to moderate number of inducer blades best ensure high performance, wide working range, and efficient two-phase mixing.

Advanced Strategy for Droplet Routing in Digital Microfluidic Biochips Using ACO

2015 ◽  
pp. 252-284 ◽  
Author(s):  
Indrajit Pan ◽  
Tuhina Samanta
Keyword(s):  
Ant Colony Optimization ◽  
High Performance ◽  
Ant Colony ◽  
Second Phase ◽  
Phase 2 ◽  
Bounding Box ◽  
Ant Systems ◽  
Two Phases ◽  
Comparative Results ◽  
Digital Microfluidic

Significant researches are going on for high performance droplet routing in Digital Microfluidic Biochip (DMFB). This chapter elaborates an ant colony optimization based droplet routing technique for high performance design in DMFB. The method is divided into two phases. (1) In the first phase, two dedicated ants generated from each source of the droplets traverse the rectilinear path between the source-target pairs and deposit pheromone to construct rectangular bounding box. Initial bounding box helps in restricted ant movements in the next phase. (2) In the second phase, real routing path is generated. Detour and stalling phenomena are incurred to resolve routing conflict. The method has explored both single ant and multiple ant systems to address detours from the conflicting zone in search for the best possible route towards destination. The method has been simulated on several existing benchmarks and comparative results are quite encouraging.

Two Phases and Two Components

1993 ◽  
Author(s):  
Brian Bayly
Keyword(s):  
Chemical Change ◽  
Interface State ◽  
Maximum Intensity ◽  
Physical Situation ◽  
Essential Difference ◽  
Exponential Functions ◽  
Moving Interface ◽  
Stationary Interface ◽  
Two Phases ◽  
Main Ideas

The overall plan of Chapters 13 through 16 is shown in the introductory figure of Part III. As the figure suggests, the objective of this chapter can be stated in three ways: (i) to extend ideas from Chapter 15 to a situation where an interface is present, or (ii) to extend ideas from Chapter 13 to a situation where the material envisaged is of variable composition, or (iii) to combine the main ideas from Chapter 14 and 15 with the main ideas from Chapter 13. The program of the present chapter is to do a little of (i) and then a little of (ii), before attempting a total union. By way of preview, it is to be noted that an interface may move with respect to the material on either side or, in other words, material may change phase, crossing the interface as it does so. Situations with a moving interface are more complicated than situations where the interface is stationary. In both part (i) and part (ii) of this chapter, the fact that the interface moves is recognized but disregarded. The reason is that in part (iii), a particular combination of circumstances is examined that leads to no movement of the interface. Such a combination is highly special and not likely to be met in the real world, but it shows particularly clearly how chemical change and a material's deformation interact. The overall program then is to lead up to discussion of this stationary-interface state. Chapters 14 and 15 emphasize spatial variations of a harmonic kind, continuing through space at constant amplitude to an unlimited extent. The essential difference in this chapter is that here we treat effects that have maximum intensity at or close to an interface, and die away to insignificance in the remote interiors of the two touching phases. Exponential functions were found useful to describe an effect of this type in Chapter 13, and it is natural to seek a physical situation where they can be used again; the first step is to distinguish the two types of behavior in Figure 16.1.

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