Wind Effects on Large Antennas and Telecommunication Towers: Analysis and Design of Main Components and Joints

2000 ◽  
pp. 87-102
Author(s):  
C. Borri ◽  
M. Betti ◽  
P. Biagini
Keyword(s):  
Wind Effects ◽  
Analysis And Design ◽  
Telecommunication Towers ◽  
Main Components

GDVFS: A New Toolkit for Analysis and Design of Vegetative Filter Strips Using VFSMOD

2010 ◽  
Vol 45 (1) ◽  
pp. 59-68 ◽  
Author(s):  
Ramesh P. Rudra ◽  
Bahram Gharabaghi ◽  
Saleh Sebti ◽  
Neelam Gupta ◽  
Ashwini Moharir
Keyword(s):  
Phosphorus Removal ◽  
Design Tool ◽  
Vegetative Filter Strips ◽  
Bacteria Transport ◽  
Filter Strips ◽  
Analysis And Design ◽  
Vegetative Filter Strip ◽  
Removal Efficiencies ◽  
Computational Procedures ◽  
Main Components

Abstract The Guelph design tool for vegetative filter strips, GDVFS, is a toolkit for the analysis and design of vegetative filter strips (VFSs). The upland hydrology model UH and the vegetative filter strip model VFSMOD (the two main components of GDVFS) were adopted from an existing interface (VFSMOD-W), and new nutrient and bacteria transport add-ons for UH and VFSMOD were incorporated into GDVFS. Other utilities and tools were also included in GDVFS to provide a capable toolkit for the analysis and design of VFSs. The published evaluation of computational procedures used in GDVFS indicates that these procedures perform very well in the estimation of VFS sediment and phosphorus removal efficiencies. According to these results, comparison of the predicted and observed values for sediment and phosphorus removal efficiencies indicates 10 and 20% error, respectively. This paper provides descriptions on the capabilities and methodology followed in the GDVFS toolkit.

Integrated System Analysis and Design of Podded Ship Propulsors

1998 ◽  
Vol 35 (03) ◽  
pp. 151-174
Author(s):  
William A. Facinelli ◽  
David Muggeridge
Keyword(s):  
System Analysis ◽  
Three Dimensional ◽  
Integrated System ◽  
Approximate Methods ◽  
Analysis And Design ◽  
Spreadsheet Model ◽  
Other Information ◽  
Sensitivity Studies ◽  
And Performance ◽  
Main Components

AlliedSignal has studied podded propulsion for surface combatants for the US Navy under a contract sponsored by DARPA. The integrated system analysis included mathematical models for the main components of a podded propulsor. The models addressed both performance and cost. Components modeled included the propulsor itself (single propeller, ducted propeller, etc.), bearings, coupling, gearbox, motor, and azimuthing system. Simplified, approximate methods, especially for propulsor sizing and performance, were used. Other information in the literature and product data from leading vendors was used to size the components and to estimate their efficiencies. In other sections of the model, life-cycle fuel costs and costs of reliability were computed. The model was used to size and estimate the total costs for different configurations for four surface ships. A conceptual design for each vessel was selected, and three-dimensional CAD renderings of four pods were prepared. Sensitivity studies were run to show the effects of variations in fuel cost and in the relative efficiencies of propulsor types. Subsequent to the naval program data on a typical cruise ship were obtained and the spreadsheet model was applied to that platform.

Mechanical Analysis on the Main Components of Backward Rotary Transplanting Mechanism in Wide-Narrow Row Planting

2014 ◽  
Vol 633-634 ◽  
pp. 1285-1288
Author(s):  
Ting Ting Wang ◽  
Feng Qin Zhao ◽  
Chang Jiang Shi ◽  
Fan Yang
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Optimization Design ◽  
Design Method ◽  
Mechanical Analysis ◽  
Analysis And Design ◽  
Narrow Row ◽  
Main Components ◽  
Element Method

For the problem of the design on the main components of backward rotary transplanting mechanism in wide-narrow row planting, finite element method based on SolidWorks Simulation was applied to analyze it. In the analysis, the defects in the design were discovered. By improving these defects, the aim of optimization design was achieved. This analysis and design method can effectively avoid the defects caused by conversion between different softwares, which has higher practical value.

scholarly journals Manual RC Bridge Analysis and Designing

2020 ◽  
Vol 5 (8) ◽  
pp. 116-178
Author(s):  
Ayaanle Maxamed Ali
Keyword(s):  
Road Traffic ◽  
Moving Load ◽  
Railway Bridge ◽  
Social Infrastructure ◽  
Railway Transportation ◽  
Analysis And Design ◽  
The Road ◽  
Infrastructure System ◽  
Pass Through ◽  
Main Components

Bridges is a structure intended to carry the road traffic or other moving load to pass through the obstacles. The bridge may be roadway bridge, railway bridge,a canal, pipelines, etc. the main obstacles can be river, valley, and others.Bridges are very important in the modern roads and railway transportation system, generally serving as social infrastructure system. During constructing bridge there are three main components of the bridge, and they are (substructure, superstructure, bearing), etc. this study is concern about the manual analysis and design of the bridge, it’s built for the purpose of providing passage over the obstacles, generally something that can obstacle to cross otherwise.

Porosity models and computational methods for compressible-flow aerodynamics of parachutes with geometric porosity

2017 ◽  
Vol 27 (04) ◽  
pp. 771-806 ◽  
Author(s):  
Kenji Takizawa ◽  
Tayfun E. Tezduyar ◽  
Taro Kanai
Keyword(s):  
Compressible Flow ◽  
Computational Methods ◽  
Computational Analysis ◽  
Computational Framework ◽  
Design Studies ◽  
Analysis And Design ◽  
Structure Interaction ◽  
Main Components ◽  
Spacecraft Parachutes ◽  
Supg Method

Spacecraft-parachute designs quite often include “geometric porosity” created by the hundreds of gaps and slits that the flow goes through. Computational fluid–structure interaction (FSI) analysis of these parachutes with resolved geometric porosity would be exceedingly challenging, and therefore accurate modeling of the geometric porosity is essential for reliable FSI analysis. The space–time FSI (STFSI) method with the homogenized modeling of geometric porosity has proven to be reliable in computational analysis and design studies of Orion spacecraft parachutes in the incompressible-flow regime. Here we introduce porosity models and ST computational methods for compressible-flow aerodynamics of parachutes with geometric porosity. The main components of the ST computational framework we use are the compressible-flow ST SUPG method, which was introduced earlier, and the compressible-flow ST Slip Interface method, which we introduce here. The computations we present for a drogue parachute show the effectiveness of the porosity models and ST computational methods.

scholarly journals System Design of Mobile Augmented Book

2016 ◽  
Vol 10 (1) ◽  
pp. 59 ◽  
Author(s):  
Kobkiat Saraubon ◽  
Prachyanun Nilsook ◽  
Panita Wannapiroon
Keyword(s):  
Adaptive Learning ◽  
System Architecture ◽  
Cloud Service ◽  
Smart Phones ◽  
Mobile Technologies ◽  
Analysis And Design ◽  
Application Logic ◽  
E Learning ◽  
Media Server ◽  
Main Components

Mobile technologies play an increasingly important role in education. Devices such as smart phones and tablets are becoming powerful tools in the hands for e-Learning, m-Learning and ubiquitous learning. In this paper, the authors propose analysis and design software architecture of a mobile augmented book for in-class and out-class learning. The aim is to improve the quality and usefulness of mobile learning by utilizing a physical book and a mobile device. Requirements, roles, and system architecture are discussed in terms of adaptive learning. The system architecture is based on a three-tier model; presentation tier, application logic tier and data tier. The application logic tier is comprised of four main components including 1) Profile/Registration, 2) Content/ Administration, 3) Communication 4) Quiz and 5) Report. The data tier consists of 1) Cloud Service, 2) Media Server and 3) Database. The presentation tier is designed to support all mobile devices--smart phones and tablets and all popular platforms including Android, iOS, Windows phone, Tizen, Ubuntu, Firefox and BlackBerry. JSON and Streaming media are used for the communications between the presentation tier (client devices) and the application logic tier. The data tier consists of 1) repository using cloud service and media server for storing and retrieving digital contents and 2) database for credentials, content descriptions and meta-data.

scholarly journals A Novel RC-Based Architecture for Cell Equalization in Electric Vehicles

Energies ◽  
2020 ◽  
Vol 13 (9) ◽  
pp. 2349 ◽  
Author(s):  
Alfredo Alvarez-Diazcomas ◽  
Adyr A. Estévez-Bén ◽  
Juvenal Rodríguez-Reséndiz ◽  
Miguel-Angel Martínez-Prado ◽  
Jorge D. Mendiola-Santíbañez
Keyword(s):  
Electric Vehicles ◽  
Discharge Rate ◽  
Threshold Current ◽  
Internal Resistance ◽  
Transport Sector ◽  
Analysis And Design ◽  
Operation Analysis ◽  
Main Components ◽  
Traction System ◽  
Cell Series

Nowadays, research on electric vehicles is increasing because they have the potential to decrease greenhouse-gas emissions dramatically in the transport sector. For these types of vehicles, the battery is one of the main components. The traction system needs a cell series connection to fulfill the energy requirements. Nevertheless, batteries differ from each other due to a normal dispersion in their capacity, internal resistance, and self-discharge rate. This paper presents a novel battery equalizer circuit using an RC-based topology to equalize two adjacent cells of a battery pack. It has the advantage of merging a resistor-based equalizer, a capacitor-based equalizer, and an RC-based equalizer in one circuit. In this way, it is possible to limit the current stress in the components of the circuit. The proposed method increases the equalization time by 35% for a threshold current of 4 A. However, it is possible design the system for another threshold current. Finally, the complexity of the controller is not compromised in the proposed architecture. The operation, analysis, and design of the architecture are presented and compared to the classic schemes. The theoretical analysis is validated through simulation results.

Structural analysis of the photosynthetic membrane from Ectothiorhodospira halochloris

1983 ◽  
Vol 41 ◽  
pp. 740-741
Author(s):  
H. Engelhardt ◽  
R. Guckenberger ◽  
W. Baumeister
Keyword(s):  
Lattice Structure ◽  
Bacterial Species ◽  
Hexagonal Lattice ◽  
Reaction Centre ◽  
Photosynthetic Membrane ◽  
Rhodopseudomonas Viridis ◽  
Photosynthetic Membranes ◽  
Ectothiorhodospira Halochloris ◽  
Main Components

Bacterial photosynthetic membranes contain, apart from lipids and electron transport components, reaction centre (RC) and light harvesting (LH) polypeptides as the main components. The RC-LH complexes in Rhodopseudomonas viridis membranes are known since quite seme time to form a hexagonal lattice structure in vivo; hence this membrane attracted the particular attention of electron microscopists. Contrary to previous claims in the literature we found, however, that 2-D periodically organized photosynthetic membranes are not a unique feature of Rhodopseudomonas viridis. At least five bacterial species, all bacteriophyll b - containing, possess membranes with the RC-LH complexes regularly arrayed. All these membranes appear to have a similar lattice structure and fine-morphology. The lattice spacings of the Ectothiorhodospira haloohloris, Ectothiorhodospira abdelmalekii and Rhodopseudomonas viridis membranes are close to 13 nm, those of Thiocapsa pfennigii and Rhodopseudomonas sulfoviridis are slightly smaller (∼12.5 nm).

Electron Microscopy of Human Gallstones

1971 ◽  
Vol 29 ◽  
pp. 296-297
Author(s):  
C. Wolpers ◽  
R. Blaschke
Keyword(s):  
Electron Microscopy ◽  
Room Temperature ◽  
Bile Pigment ◽  
X Ray Diffraction ◽  
Triclinic Crystal System ◽  
X Ray ◽  
Follow Up Study ◽  
Infra Red ◽  
Main Components

Scanning microscopy was used to study the surface of human gallstones and the surface of fractures. The specimens were obtained by operation, washed with water, dried at room temperature and shadowcasted with carbon and aluminum. Most of the specimens belong to patients from a series of X-ray follow-up study, examined during the last twenty years. So it was possible to evaluate approximately the age of these gallstones and to get information on the intensity of growing and solving.Cholesterol, a group of bile pigment substances and different salts of calcium, are the main components of human gallstones. By X-ray diffraction technique, infra-red spectroscopy and by chemical analysis it was demonstrated that all three components can be found in any gallstone. In the presence of water cholesterol crystallizes in pane-like plates of the triclinic crystal system.

A controller for safe, convenient operation of LaB6 emitters on electron-beam instruments

1983 ◽  
Vol 41 ◽  
pp. 408-409
Author(s):  
W. J. Abramson ◽  
H. W. Estry ◽  
L. F. Allard
Keyword(s):  
Electron Beam ◽  
Control System ◽  
Thermal Shock ◽  
Appropriate Care ◽  
Electron Guns ◽  
Tungsten Filaments ◽  
Order Of Magnitude ◽  
Main Components

LaB6 emitters are becoming increasingly popular as direct replacements for tungsten filaments in the electron guns of modern electron-beam instruments. These emitters offer order of magnitude increases in beam brightness, and, with appropriate care in operation, a corresponding increase in source lifetime. They are, however, an order of magnitude more expensive, and may be easily damaged (by improper vacuum conditions and thermal shock) during saturation/desaturation operations. These operations typically require several minutes of an operator's attention, which becomes tedious and subject to error, particularly since the emitter must be cooled during sample exchanges to minimize damage from random vacuum excursions. We have designed a control system for LaBg emitters which relieves the operator of the necessity for manually controlling the emitter power, minimizes the danger of accidental improper operation, and makes the use of these emitters routine on multi-user instruments.Figure 1 is a block schematic of the main components of the control system, and Figure 2 shows the control box.

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