scholarly journals Plume Behavior In A Confined Tall And Narrow Space-as One Of Sub-models Of Plume For An Atrium Fire-

1994 ◽  
Vol 4 ◽  
pp. 551-562 ◽  
Author(s):  
S. Hiroomi ◽  
Osami Sugawa ◽  
Hitoshi Kurioka ◽  
W. Takahash
Keyword(s):  
Narrow Space ◽  
Atrium Fire

scholarly journals Adaptive-Neural-Network-Based Shape Control for a Swarm of Robots

Complexity ◽  
2018 ◽  
Vol 2018 ◽  
pp. 1-8 ◽  
Author(s):  
Xuejing Lan ◽  
Zhenghao Wu ◽  
Wenbiao Xu ◽  
Guiyun Liu
Keyword(s):  
Neural Network ◽  
Nonlinear Dynamics ◽  
Shape Control ◽  
Formation Control ◽  
Adaptive Neural Network ◽  
Multirobot System ◽  
Control Scheme ◽  
Narrow Space ◽  
The Stability ◽  
Unknown Nonlinear Dynamics

This paper considers the region-based formation control for a swarm of robots with unknown nonlinear dynamics and disturbances. An adaptive neural network is designed to approximate the unknown nonlinear dynamics, and the desired formation shape is achieved by designing appropriate potential functions. Moreover, the collision avoidance, velocity consensus, and region tracking are all considered in the controller. The stability of the multirobot system has been demonstrated based on the Lyapunov theorem. Finally, three numerical simulations show the effectiveness of the proposed formation control scheme to deal with the narrow space, loss of robots, and formation merging problems.

scholarly journals Thermodynamics of structured fluids. Hard science for soft materials

2000 ◽  
Vol 72 (10) ◽  
pp. 1819-1834 ◽  
Author(s):  
John M. Prausnitz
Keyword(s):  
Self Assembly ◽  
Theoretical Calculations ◽  
Soft Materials ◽  
Confined Space ◽  
Molecular Physics ◽  
Fluid Structure ◽  
Light Emitting ◽  
Structured Fluids ◽  
Recent Developments ◽  
Narrow Space

At liquid-like densities, molecules of complex fluids can assume a variety of structures (or positions) in space; when the molecules contain many atoms as, for example, in polymers, that variety becomes very large. Further, when confined to a narrow space, it is possible to achieve structures that are not normally observed. Thanks to recent advances in statistical mechanics and molecular physics, and thanks to increasingly fast computers, it is now possible to calculate a fluid's structure, that is, the positions of molecules at equilibrium under given conditions. Calculation of fluid structure is useful because thermodynamic properties depend strongly on that structure, leading to possible applications for new materials. Three examples illustrate some recent developments; each example is presented only schematically (with a minimum of equations) to indicate the physical basis of the mathematical description. The first example considers the effect of branching on self-assembly (micellization) of copolymers (with possible long-range applications in medicine). The second and third examples consider the effect of confinement on fluid structure: first, crystallization in a narrow, confined space to produce a desired crystal structure (with possible applications for light-emitting diodes) and second, suppression of micellization of a diblock copolymer in a thin film (with possible application in lithography). Whenever possible, theoretical calculations are compared with experimental results.

scholarly journals Implementing 5S in a Hungarian Company

2018 ◽  
Vol 3 (5) ◽  
pp. 161-173
Author(s):  
Andrea Matkó ◽  
S. Malhotra
Keyword(s):  
Organizational Culture ◽  
Everyday Life ◽  
System Transformation ◽  
Private Business ◽  
Lean Thinking ◽  
Office Environment ◽  
Smooth Flow ◽  
The Everyday ◽  
Narrow Space

The methods and tools used by Lean management can be used for any activity that is specifically introduced to the company. On this basis, the objective of this paper is the implementation of a Lean office with a 5S system transformation into the traditional office environment of a private business. During the workflow, it is also planned to create new habits in this narrow space that will incorporate the organizational culture into the everyday life of the business making the administration more effective. The 5S concept is new and helps the company to operation on a larger scale with fewer inputs than before. Figures are made for better understanding and a Red Tag is created which is the first step of the process. Red Tag tells the employees about the history and the process which will be needed on it. The basic of lean thinking is the contunious improvement in the quality of the product while minimaxing the wastes created during the process. The Next Broker Consultancy Ltd adopted this new way of management and made sure that all the necessary measurement are taken to insure smooth flow of the process.

scholarly journals Obstacle Avoidance Control for Multisteering Mode of Multiaxle Wheeled Robot Based on Trajectory Prediction Strategy

2021 ◽  
Vol 2021 ◽  
pp. 1-13
Author(s):  
Yongqiang Zhu ◽  
Junru Zhu ◽  
Pingxia Zhang
Keyword(s):  
Obstacle Avoidance ◽  
Control Strategy ◽  
Trajectory Prediction ◽  
Coverage Area ◽  
Iterative Calculation ◽  
Wheeled Robot ◽  
Avoidance Control ◽  
Narrow Space ◽  
The Relationship ◽  
Prediction Strategy

A multiaxle wheeled robot is difficult to be controlled due to its long body and a large number of axles, especially for obstacle avoidance and steering in narrow space. To solve this problem, a multisteering mode control strategy based on front and rear virtual wheels is proposed, and the driving trajectory prediction of the multiaxle wheeled robot is analyzed. On this basis, an obstacle avoidance control strategy based on trajectory prediction is proposed. By calculating the relationship between the lidar points of the obstacle and the trajectory coverage area, the iterative calculation of the obstacle avoidance scheme for the proposed steering is carried out, and the feasible obstacle avoidance scheme is obtained. The mechanical structure, hardware, and software control system of a five-axle wheeled robot are designed. Finally, to verify the effectiveness of the obstacle avoidance strategy, a Z-shaped obstacle avoidance experiment was carried out. The results confirm the effectiveness of the proposed control strategy.

scholarly journals APLIKASI PEMBELAJARAN PERALATAN TANJIDOR BERBASIS ANDROID

JOUTICA ◽  
2017 ◽  
Vol 1 (2) ◽  
Author(s):  
Yusuf Permadi ◽  
Nur Nafiiyah
Keyword(s):  
Operating System ◽  
Musical Instruments ◽  
Wind Instruments ◽  
Entertainment Media ◽  
Snare Drum ◽  
Space And Time ◽  
Wind Instrument ◽  
Technological Developments ◽  
Narrow Space

Smartphone is the manifestation of the technological developments that can narrow space and time. Smartphone is not only used as a means of communication but as a means of entertainment for many kinds of applications that is presented by the developers. Android is an operating system that is widely used by several manufacturers of smartphones today. Application is a program which is designed to perform a function with specific goals and purposes. Tanjidor is the musical art of Betawi. Tanjidor did not come originally from Indonesia, but from Portuguese language in a word Tangedor which means “stringed musical instruments”. Tanjidor itselfis played in several musical instruments category, namely wind instruments (in particular instrument it is called as mouthpiece) like clarinet, trombone, tuba, saxophone, and trumpet. In addition, there is also wind instrument musical which played by hit it (in a particular type it is called a percussion), like snare drum, tenor drum, bass drum, cymbals and drums. Android-based Tanjidor equipment learning application is used as the entertainment media and also aims to preserve the Indonesian art heritage by inserting Tanjidor instruments in Android smartphon. Therefore, Tanjidor musical art does not disappear over the time.

scholarly journals Possible Explanation of the Quark Confinement and Asymptotic Freedom, and Possible Solution to the Yang-Mills Mass Gap Problem

2019 ◽  
Vol 16 (1) ◽  
pp. 391-478
Author(s):  
Antonio Puccini
Keyword(s):  
Gauge Theories ◽  
Rest Mass ◽  
Mathematical Structure ◽  
Physical Reality ◽  
Asymptotic Freedom ◽  
Nuclear Forces ◽  
Spatial Confinement ◽  
Yang Mills ◽  
Mass Gap ◽  
Narrow Space

With this work, we try to answer 3 fundamental questions that have plagued mathematicians and physicists for several decades. As known, the spontaneous symmetry breaking (SSB) and the Brout-Englert-Higgs Mechanism (BEH-M) solved the Yang-Mills Mass Gap Problem. However, various mathematicians, even prestigious ones, consider the basic assumptions of the gauge theories to be wrong, as well as in conflict with the experimental evidences and in clear disagreement with the facts, distorcing the physical reality itself. Likewise, the Quantum Fields Theory (QFT) is mathematically inconsistent, adopting a mathematical structure somewhat complicated and arbitrary, which does not satisfy the strong demands for coherence. The weakest point of the gauge theories, in our opinion, consists in imposing that all the particles must be free of an intrinsic mass (massless). On the contrary, even for the particle considered universally massless, i.e. the photon (P), our calculations show a dynamic-mass, a push-momentum (p) of 1.325⋅10−22[g⋅cm/s]. That is, an optic P hits a particle with an energy-mass greater than 100 protons rest-mass’. It is clear that if we replaced this value with the full value of the P inserted in the equations of the Perturbation Theory, QFT and Yang-Mills theories, all divergences, that is all zeroes and infinities, would suddenly disappear. Consequently, the limits imposed by the SSB disappear so that there is no longer any need to deny the mass to the Nuclear Forces bosons, including the Yang-Mills b quantum. Still, the photons (Ps) are the basis of the quantum vacuum energy, which is distributed ubiquitously, also within the intra-atomic spaces. It is likely that a lot of Ps were trapped in atomic nuclei (at the time of nucleosynthesis) and among quarks (Qs) at the time of primordial nucleonic synthesis. We believe that when Qs get too close to each other, till repelling each other (Asymptotic Freedom of Qs), this may depend on the presence of a multitude of Ps that, no further compressible, begin to exert an antigravity repulsive force, just as a Dark Energy. This limit to Compressibility (C) of the radiation is shown in equation: PV 4/3 = C, where V is the volume, and P is the Pressure of the photonic gas. Quantum Mechanics plays a crucial role, through the Uncertainty Principle, in the spatial Confinement of Qs, which have remained eternally confined in an extremely narrow space by the  Strong Interaction, but in primis by the very short range (likely ≈8.44[±1.44]⋅10-16cm) and lifetime of gluon(G) which, from our calculations, is ≈2.73[±0.564]⋅10-26 sec. Therefore, a new parameter may be added to the Qs and G spatial Confinement: the b quantum or G Temporal Confinement (and of their Colours and anti-Colours). 

scholarly journals G804 Studies on Flow Field around a PC Cooling Fan used in a Narrow Space(2)

2007 ◽  
Vol 2007 (0) ◽  
pp. _G804-1_-_G804-4_
Author(s):  
Ken-ichi FUNAZAKI ◽  
Takashi SHIMADA ◽  
Hideo TANIGUCHI ◽  
Kazutoyo YAMADA ◽  
Mamoru KIKUCHI
Keyword(s):  
Flow Field ◽  
Cooling Fan ◽  
Narrow Space
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