scholarly journals WSN Based on Bio-Inspired Algorithm in Cluster Head Formation

2020 ◽  
Author(s):  
Vinmathi M S ◽  
Josephine M S ◽  
Jeyabalaraja V
Keyword(s):  
Numerical Model ◽  
Cluster Head ◽  
Scientific Model ◽  
Similar Measure ◽  
Head Formation ◽  
Set Up ◽  
System Inclusion ◽  
The Ideal ◽  
Ebb And Flow

A sort of inclusion improvement technique dependent on bio-inspired algorithm was implemented so as to fathom the irrationality and low system inclusion of sensor hub in WSN at the irregular dispersion. Right off the bat, the ebb and flow investigate status of WSN inclusion was broke down, the hub inclusion and territorial inclusion in WSN on the premise were examined, the comparing scientific model was set up, the bio-enlivened calculation was taken to tackle the built up numerical model, and the WSN inclusion advancement program dependent on the bio-roused was gotten. At last, MATLAB was utilized for the recreation analyses, and the reproduction results demonstrated that the presentation of bio-motivated calculation improved the hub inclusion in WSN viably; the inclusion territory was huger at a similar measure of hubs. In addition, the calculation can get the ideal arrangement in the worldwide extension, and arrive at the better system inclusion advancement impact with less sensor hubs, and the quantity of cycles was diminished altogether.

The World Underfoot

2018 ◽  
Author(s):  
Hallie M. Franks
Keyword(s):  
The Political ◽  
Classical Period ◽  
Social Fabric ◽  
Physiological Reaction ◽  
The Social ◽  
The World ◽  
Foreign Land ◽  
Social Gathering ◽  
Set Up ◽  
The Ideal

In the Greek Classical period, the symposium—the social gathering at which male citizens gathered to drink wine and engage in conversation—was held in a room called the andron. From couches set up around the perimeter of the andron, symposiasts looked inward to the room’s center, which often was decorated with a pebble mosaic floor. These mosaics provided visual treats for the guests, presenting them with images of mythological scenes, exotic flora, dangerous beasts, hunting parties, or the specter of Dionysos, the god of wine, riding in his chariot or on the back of a panther. This book takes as its subject these mosaics and the context of their viewing. Relying on discourses in the sociology and anthropology of space, it argues that the andron’s mosaic imagery actively contributed to a complex, metaphorical experience of the symposium. In combination with the ritualized circling of the wine cup from couch to couch around the room and the physiological reaction to wine, the images of mosaic floors called to mind other images, spaces, or experiences, and, in doing so, prompted drinkers to reimagine the symposium as another kind of event—a nautical voyage, a journey to a foreign land, the circling heavens or a choral dance, or the luxury of an abundant past. Such spatial metaphors helped to forge the intimate bonds of friendship that are the ideal result of the symposium and that make up the political and social fabric of the Greek polis.

scholarly journals Numerical Aspects of Particle-in-Cell Simulations for Plasma-Motion Modeling of Electric Thrusters

Aerospace ◽  
2021 ◽  
Vol 8 (5) ◽  
pp. 138
Author(s):  
Giuseppe Gallo ◽  
Adriano Isoldi ◽  
Dario Del Gatto ◽  
Raffaele Savino ◽  
Amedeo Capozzoli ◽  
...  
Keyword(s):  
Numerical Model ◽  
Computing Time ◽  
Computational Time ◽  
Electric Motors ◽  
Motion Modeling ◽  
Particle In Cell ◽  
Computing Platform ◽  
Hall Effect Thruster ◽  
Set Up ◽  
Pic Code

The present work is focused on a detailed description of an in-house, particle-in-cell code developed by the authors, whose main aim is to perform highly accurate plasma simulations on an off-the-shelf computing platform in a relatively short computational time, despite the large number of macro-particles employed in the computation. A smart strategy to set up the code is proposed, and in particular, the parallel calculation in GPU is explored as a possible solution for the reduction in computing time. An application on a Hall-effect thruster is shown to validate the PIC numerical model and to highlight the strengths of introducing highly accurate schemes for the electric field interpolation and the macroparticle trajectory integration in the time. A further application on a helicon double-layer thruster is presented, in which the particle-in-cell (PIC) code is used as a fast tool to analyze the performance of these specific electric motors.

GIS Based Multi-Criteria decision support system and machine learning for Hospital Site Selection case study Oran - Algeria

2022 ◽  
Vol 14 (1) ◽  
pp. 0-0
Keyword(s):  
Site Selection ◽  
Decision Makers ◽  
Analysis Method ◽  
Automatic Learning ◽  
Hospital Site ◽  
Set Up ◽  
High Level ◽  
Selection Of ◽  
The Ideal

The selection of hospital sites is one of the most important choice a decision maker has to take so as to resist the pandemic. The decision may considerably affect the outbreak transmission in terms of efficiency , budget, etc. The main targeted objective of this study is to find the ideal location where to set up a hospital in the willaya of Oran Alg. For this reason, we have used a geographic information system coupled to the multi-criteria analysis method AHP in order to evaluate diverse criteria of physiological positioning , environmental and economical. Another objective of this study is to evaluate the advanced techniques of the automatic learning . the method of the random forest (RF) for the patterning of the hospital site selection in the willaya of Oran. The result of our study may be useful to decision makers to know the suitability of the sites as it provides a high level of confidence and consequently accelerate the power to control the COVID19 pandemic.

scholarly journals Explosion waves and shock waves Part II—The shock wave and explosion products sent out by blasting detonators

1935 ◽  
Vol 148 (865) ◽  
pp. 604-622 ◽  
Keyword(s):  
Picric Acid ◽  
Point Of View ◽  
Hopkinson Pressure Bar ◽  
Similar Measure ◽  
Explosion Products ◽  
Lead Plate ◽  
Logical Method ◽  
Metal Casing ◽  
Set Up ◽  
Pressure Bar

The detonation of a cartridge of a high explosive is started by firing a detonator, which consists of a small metal cylinder containing a compound or mixture which is itself readily detonated when it is heated. The manner in which detonators thus function is not thoroughly understood, and the methods used for measuring their "efficiency" are, in consequence, diverse. By some methods only the total blow given by the detonator, or its crushing and shattering effect, is measured; the nail test and sand test are the crudest forms. The lead plate test gives a similar measure, and the efficiency of a detonator is judged not only by the depth of the impression produced, but also by the number and appearance of radial grooves in the lead plate produced by the disrupted metal casing. More precise physical methods have been adopted, such as the Hopkinson pressure-bar , which gives a measure of the time of action of the impulsive blow. A more logical method of measurement of efficiency would appear to be a examine the ease with which the detonator will set up detonation in a standard explosive or in a series of standard explosives. Such a method is the Esop test , in which measurement is made of the maximum amount of olive or cotton seed oil which can be mixed with picric acid without preventing its detonation by the detonator embedded in the mixture. Of the same type is the gap test , in which the detonator and a standard explosive are separated and the maximum distance is measured at which detonation of the explosive can be established. The efficiency of a detonator is of considerable technical importance. The more rapidly a detonator can set up detonation in a cartridge of explosive the greater will be the proportion of the cartridge which will detonate and the greater therefore will be the efficiency of the explosive, though once detonation is effectively set up it will be independent of the strength of detonator used. The use of an inefficient detonator may result in portions of cartridges remaining undetonated and becoming a source of danger during the subsequent handling of the material that has been blasted. With the desensitized explosives that are used in coal mines the efficiency of the detonator may influence the safety of the explosive from the point of view of its ability to ignite firedamp. The present investigation has been carried out for that reason.

Enhancement of the Completion Efficiency of Perforation Tunnels in Petroleum Wells

2006 ◽  
Author(s):  
M. A. Rahman ◽  
T. Heidrick ◽  
B. Fleck ◽  
M. Koksal
Keyword(s):  
Fluid Flow ◽  
Conventional Method ◽  
Differential Pressure ◽  
Triaxial Testing ◽  
Flow Rates ◽  
Different Types ◽  
Set Up ◽  
Petroleum Wells ◽  
Perforated Completion ◽  
The Ideal

The objective of perforating is to maximize well productivity by establishing good connectivity between the wellbore and formation. The conventional method of perforation — perforation by shooting (PS) — cannot achieve expected wellbore productivity due to a region of reduced permeability around the perforation tunnel. In this study, it has been established that permeability is decreased in the range of 30%–75% due to the implementation of the PS technique compared to the openhole completion. As a result, a new perforation technique — perforation by drilling (PD) — has been proposed in this paper. To simulate a perforated completion, cylindrical sand samples (0.0572 in OD) consolidated with cement with varying porosity were prepared. These samples were perforated (0.0136 m ED) by the PS, PD and Casting techniques. Perforations created by the Casting techniques are considered the ideal, openhole perforation tunnel. Fluid flow rates and differential pressure across the perforated samples were measured for three different types of samples using “Geotechnical Digital System” triaxial testing set-up. Fluid flow rates with changing differential pressure and finally pressure build-up data with time indicates the PD technique can achieve better wellbore productivity compared to the PS technique. Results indicate that at 100 kPa differential pressure the PS, PD and Casting techniques can achieve 0.20 mL/s, 0.65 mL/s and 1.00 mL/s fluid flow rates respectively across a sample.

Numerical and Experimental Studies on the Development of Variable Density Nanocomposites for Structural Applications

2018 ◽  
Author(s):  
Jayaram R. Pothnis ◽  
Dinesh Kalyanasundaram ◽  
Suhasini Gururaja
Keyword(s):  
Numerical Model ◽  
Epoxy Resin ◽  
Electric Fields ◽  
Experimental Studies ◽  
Electrical Characterization ◽  
Variable Density ◽  
Transient Nature ◽  
Structural Applications ◽  
Measured Sample ◽  
Set Up

Numerical and experimental studies performed to develop nanocomposites with varying carbon nanotube (CNT) alignment density within an epoxy matrix are presented. A 3-D numerical model has been developed that looks at the behavior of CNTs in epoxy resin subjected to non-uniform electric fields by explicitly accounting for electric field coupled with fluid flow and particle motion considering the transient resin viscosity. The transient nature of resin viscosity has been incorporated into the simulation study with data related to resin viscosity variation with time and temperature generated experimentally. The response of CNTs due to the induced dielectrophoretic force was studied using the numerical model. The model facilitated the design of an optimal electrode configuration for the processing of variable density composites. A computer controlled Arduino UNO based circuitry was developed to control supply of voltage to the electrodes during sample fabrication. The circuit was then integrated with AC voltage supply units and the electrode set-up for fabricating the variable density composite samples. Low weight fractions of CNTs (0.05 wt.% and 0.1 wt.%) in epoxy resin were used for the experimental work and preliminary experimental studies were conducted. Electrical characterization results of the variable density nanocomposites indicate over 100% and 30% increase in electrical resistance measured across sample widths in 0.05 wt.% and 0.1 wt.% CNT samples, respectively. The measured sample resistance values confirmed that variation in CNT alignment density was achieved across the samples.

The Numerical Simulation of the Water Jet in Hydroentanglement

2011 ◽  
Vol 189-193 ◽  
pp. 2181-2184
Author(s):  
Heng Zhang ◽  
Xiao Ming Qian ◽  
Zhi Min Lu ◽  
Yuan Bai
Keyword(s):  
Numerical Simulation ◽  
Numerical Model ◽  
Multiphase Flow ◽  
Flow Model ◽  
Two Phase Flow ◽  
Water Jet ◽  
Phase Flow ◽  
Governing Equations ◽  
Two Phase ◽  
Set Up

The functions of hydroentangled nonwovens are determined by the degree of the fiber entanglement, which depend mainly on parameters of the water jet. According to the spun lacing technology, this paper set up the numerical model based on the simplified water jetting model, establishing the governing equations, and the blended two-phase flow as the multiphase flow model. This paper simulation the water needle after the water jetting from the water needle plate in the different pressure (100bar, 60bar, 45bar, 35bar).

Microfocusing options for the inelastic X-ray scattering beamline at sector 3 of the Advanced Photon Source

2014 ◽  
Vol 21 (3) ◽  
pp. 488-496
Author(s):  
A. M. Alsmadi ◽  
A. Alatas ◽  
J. Y. Zhao ◽  
M. Y. Hu ◽  
L. Yan ◽  
...  
Keyword(s):  
Beam Size ◽  
X Ray ◽  
X Ray Scattering ◽  
Front End ◽  
Slope Error ◽  
Beam Transmission ◽  
Set Up ◽  
Photon Source ◽  
The Ideal ◽  
Ray Scattering

Synchrotron radiation from third-generation high-brilliance storage rings is an ideal source for X-ray microbeams. The aim of this paper is to describe a microfocusing scheme that combines both a toroidal mirror and Kirkpatrick–Baez (KB) mirrors for upgrading the existing optical system for inelastic X-ray scattering experiments at sector 3 of the Advanced Photon Source.SHADOWray-tracing simulations without considering slope errors of both the toroidal mirror and KB mirrors show that this combination can provide a beam size of 4.5 µm (H) × 0.6 µm (V) (FWHM) at the end of the existing D-station (66 m from the source) with use of full beam transmission of up to 59%, and a beam size of 3.7 µm (H) × 0.46 µm (V) (FWHM) at the front-end of the proposed E-station (68 m from the source) with a transmission of up to 52%. A beam size of about 5 µm (H) × 1 µm (V) can be obtained, which is close to the ideal case, by using high-quality mirrors (with slope errors of less than 0.5 µrad r.m.s.). Considering the slope errors of the existing toroidal and KB mirrors (5 and 2.9 µrad r.m.s., respectively), the beam size grows to about 13.5 µm (H) × 6.3 µm (V) at the end of the D-station and to 12.0 µm (H) × 6.0 µm (V) at the front-end of the proposed E-station. The simulations presented here are compared with the experimental measurements that are significantly larger than the theoretical values even when slope error is included in the simulations. This is because of the experimental set-up that could not yet be optimized.

Optimization Study on the Tooth Profile of Gear Shaping Roller of Honeycomb Semi-Cell Structures

2013 ◽  
Vol 423-426 ◽  
pp. 972-977
Author(s):  
Lei Qin ◽  
Yan Ting Ma ◽  
Chang Jie Luo
Keyword(s):  
Numerical Simulation ◽  
Element Model ◽  
Tooth Profile ◽  
Cell Structures ◽  
Optimization Study ◽  
Set Up ◽  
Shaping Roller ◽  
Gear Shaping ◽  
The Ideal

In order to solve the problem of low accuracy of honeycomb semi-cell structures which are rolled by traditional trapezoidal tooth profile gear shaping rollers, conjugate trapezoidal tooth profile gear shaping rollers have been put forward to improve the quality of honeycomb semi-cell structures, basing on the theoretical analysis. Using ANSYS/LS-DYNA, a finite element model of rolling aluminum foils by two kinds of tooth profile shaping rollers was set up. Then results of numerical simulation indicate that the honeycomb semi-cell structures rolled by the conjugate trapezoidal gear shaping rollers are closer to the ideal size than those rolled by the traditional trapezoidal gear shaping rollers.

Research of Gear Shift Control Technology for a New 8-Step Speed Automatic Transmission

2013 ◽  
Vol 455 ◽  
pp. 376-382 ◽  
Author(s):  
Yang Liu ◽  
Shu Han Wang ◽  
Xi Lu ◽  
Ting Bin Song ◽  
Wen Shu Wei ◽  
...  
Keyword(s):  
Control Algorithm ◽  
Automatic Transmission ◽  
Estimation Method ◽  
Engineering Application ◽  
Shift Control ◽  
Torque Estimation ◽  
Set Up ◽  
Control Principle ◽  
Shift Clutch ◽  
The Ideal

For the development research for a new 8 step speed automatic transmission, a simplified dynamic model for this transmission was established. Aimed at four basic shift types, the ideal characteristics of shift clutch and engine control were set up. By using torque estimation method, PI slip control algorithm and engine coordinated control principle, the control model were developed for two main shift phases which are torque phase and inertia phase. The test on the rig and vehicle verified the accuracy and feasibility of this shift control strategy. The development model and algorithm have a high value for engineering application.

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