Dans cette these, nous nous sommes interesses a l'indexation des images d'art geometriques arabo-andalous. Nous proposons un traitement automatique pour l'extraction des caracteristiques de nos images. Ainsi, une attention particuliere a ete accorde aux deux caracteristiques fondamentales de l'art geometriques arabo-andalous: l'autosimilarite et la symetrie. Nous avons utilise la dimension fractale pour caracteriser l'autosimilarite presente dans le squelette multicouches d'une mosaique arabo-andalouse. Ce dernier est obtenu en calculant le nombre de couleurs dominantes dans un decor puis en extrayant la couche correspondante a chaque couleur. La signature obtenu est compacte et permet de bien capturer la structure geometrique d'un...
ISBN: 978-6-1315-4812-3
Издательство:
Книга по требованию
Дата выхода: июль 2011
Frederic P. Miller, Agnes F. Vandome, John McBrewster
High Quality Content by WIKIPEDIA articles! Contra-rotating propellers, also referred to as coaxial contra-rotating propellers, apply the maximum power of usually a single piston or turboprop engine to drive two propellers in opposite rotation. Contra-rotating propellers are common in some marine transmission systems, in particular for medium to large size planing leisure crafts. Two propellers are arranged one behind the other, and power is transferred from the engine via a planetary gear or spur gear transmission. Contra-rotating propellers should not be confused with counter-rotating propellers, a term which describes multi-engined aircraft with the airscrew on one engine turning clockwise and the other counter-clockwise....
ISBN: 978-6-1316-0918-3
Издательство:
Книга по требованию
Дата выхода: июль 2011
Frederic P. Miller, Agnes F. Vandome, John McBrewster
High Quality Content by WIKIPEDIA articles! A control rod is a rod made of chemical elements capable of absorbing many neutrons without fissioning themselves. They are used in nuclear reactors to control the rate of fission of uranium and plutonium. Because these elements have different capture cross sections for neutrons of varying energies, the compositions of the control rods must be designed for the neutron spectrum of the reactor it is supposed to control. Light water reactors (BWR, PWR) and heavy water reactors (HWR) operate with "thermal" neutrons, whereas breeder reactors operate with "fast" neutrons. Данное издание не является оригинальным. Книга печатается по...
ISBN: 978-6-1308-2230-9
Издательство:
Книга по требованию
Дата выхода: июль 2011
Is called enveloping of a curves family (C ) a curve CS which accomplish the conditions: for each point which belongs to the CS curve, is possible to find a unique curve from family which contain this point as ordinary point and which have in that point a contact of first order with CS; for each (C ) family's curve is possible to find an ordinary point of this curve which belongs to the CS curve too; nor of the (C ) family's curves don't have a common arc with the CS curve. Данное издание не является оригинальным. Книга печатается по технологии принт-он-деманд после получения заказа.
ISBN: 978-3-8433-8261-8
Издательство:
Книга по требованию
Дата выхода: июль 2011
The present investigation involves development of a CR Nifedipine microparticulate system utilizing starch acetate as the rate controlling polymer. SA was manufactured in house form native starches and characterization for degree of substitution (dS) and acetyl content among other parameters. An emulsification solvent evaporation technique was followed to develop microparticles of varying drug- polymer ratio's with triethyl citrate plasticizers at different levels. The prepared microparticles were subjected to standard evaluation such as yield, particle size, surface topography, drug content and in vitro dissolution studies.The development formulations were subsequently optimized through a simplex lattice mixture design to predict the...
ISBN: 978-3-8433-6824-7
Издательство:
Книга по требованию
Дата выхода: июль 2011
This book introduces a new strategy for mobile robot navigation. The complete navigation strategy is based on local landmark detection. However, the work developed just shows the local navigation results. In this context, local artificial potential fields are used as a way to attract the mobile robot towards a local goal that can act as a passage point and a featured landmark. In order to acomplish with the desired objective, simple perception system and reactive control behaviours were implemented and tested. Concretely, a single on-robot camera system was used to infer the closer robot environment where free aproaching path was computed. Moreover, the proposed control strategy is based on on-line model predictive control techniques...
ISBN: 978-3-8383-6061-4
Издательство:
Книга по требованию
Дата выхода: июль 2011
The main objective of this book is to develop a method to define the optimum cooling rate for cooling continuously as-cast steel on industrial level. An FEM algorithm is introduced to simulate the cooling of as-cast steel from any temperature below the solidification temperature and to predict the generation of the stress concentration regions due to the thermodynamic strains during cooling a steel specimen with different cooling rates. The algorithm is capable of being customized to simulate the thermodynamic behavior of as-cast steel microstructure with any chemical composition and any casting geometry imposed to desired cooling method. The phase transformation simulations were based on the CCT diagram and, therefore, they were...
ISBN: 978-3-6393-1661-2
Издательство:
Книга по требованию
Дата выхода: июль 2011
Owing to their distributed architecture, networked control systems are proven to be feasible in scenarios where a spatially distributed control system is required. However, basic networked control systems cannot operate over general purpose wireless networks since the stability of the system is compromised due to unbounded delays and unpredictable packet losses that are typical in the wireless medium. Approaching the wireless networked control problem from two perspectives, this book introduces a novel wireless networked control system and a realistic cooperative medium access control protocol implementation that work jointly to achieve decent control even under unbounded delay, bursts of packet loss and ambient wireless traffic. The...
ISBN: 978-3-8433-7399-9
Издательство:
Книга по требованию
Дата выхода: июль 2011
This book addresses the problem of localization for cooperative WSNs. Time synchronization is a fundamental requirement for every network. In this context, a new approach based on the estimation theory is proposed to evaluate the ultimate performance limit in network time synchronization. Sensor network localization algorithms estimate the locations of sensors with initially unknown location information by using knowledge of the absolute positions of a few sensors and inter-sensor measurements such as distance and bearing measurements. A new Semidefinite Programming (SDP) framework to analyze and solve the problem of flip- ambiguity that afflicts range-based network localization algorithms with incomplete ranging information. Another...
ISBN: 978-3-8433-5329-8
Издательство:
Книга по требованию
Дата выхода: июль 2011
As device dimensions shrink, there is an urgent need to replace conventionally used aluminum interconnects to achieve increased current density requirements and better performance at future technology node. Copper is a viable candidate due to its lower resistivity and higher resistance to electromigration. However, Cu has its own problems in its integration. It diffuses rapidly through SiO2, Si and Ge into the active regions of the device, thereby deteriorating device performance. There is therefore a need to find a diffusion barrier for Cu. This book explores ternary nitrides and a bi-layers approach as alternative solutions towards achieving the goal. Diffusion barriers are grown on Si and Ge substrates to understand their interactions...
ISBN: 978-3-6393-1044-3
Издательство:
Книга по требованию
Дата выхода: июль 2011
Frederic P. Miller, Agnes F. Vandome, John McBrewster
High Quality Content by WIKIPEDIA articles! The Cornell Lab of Ornithology is a nonprofit, member-supported organization in Ithaca, New York which studies birds and other wildlife. It is housed in the Imogene Powers Johnson Center for Birds and Biodiversity in Sapsucker Woods Sanctuary and is an administrative unit of Cornell University. Approximately 250 scientists, professors, staff, and students work in a variety of programs devoted to the Lab's mission: interpreting and conserving the Earth's biological diversity through research, education, and citizen science focused on birds. Work at the Lab is supported primarily by its 40,000 members. Данное издание не является оригинальным. Книга...
ISBN: 978-6-1340-9185-5
Издательство:
Книга по требованию
Дата выхода: июль 2011
Lambert M. Surhone, Mariam T. Tennoe, Susan F. Henssonow
High Quality Content by WIKIPEDIA articles! High Quality Content by WIKIPEDIA articles! The Corrib gas project (Irish: Ghas Aiceanta na Coiribe) entails the extraction of a natural gas deposit off the northwest coast of Ireland. The project includes a development of the Corrib gas field, and constructions of the natural gas pipeline and a gas processing plant. The project has attracted considerable opposition.The deepwater exploration licence No. 2/93 covering four blocks in the Slyne Trough was granted on 1 January 1993 for a period of 11 years to Enterprise Oil and its partners Saga Petroleum Ireland Limited, Statoil Exploration (Ireland) Limited, and Marathon International Petroleum Hibernia Limited. The licence was issued under the...
ISBN: 978-6-1333-8109-4
Издательство:
Книга по требованию
Дата выхода: июль 2011
The corrosion characteristics of Al-4.5Cu/ZrSiO4 particulate composite in 0.5molar hydrochloric acid without and with lanthanide chloride salt have been investigated. I5% ZrSiO4 was used for the production of the Al-4.5Cu/ZrSiO4 particulate composite using squeeze cast method. Addition of 15% zircon sand resulted to 5.04% decrease in density and 82.61% increase in hardness with respect to the unreinforced Al-4.5Cu matrix alloy. The time, temperature and concentration of inhibitor were varied in the range of 2-10hr, 30°C-75° and 250- 1000ppm respectively. Analysis of variance (ANOVA), factorial design and Arrhenius kinetic approach were used to explain the corrosion mechanism. All statistical design was computed at 95% confidence level....
ISBN: 978-3-8443-0749-8
Издательство:
Книга по требованию
Дата выхода: июль 2011
Frederic P. Miller, Agnes F. Vandome, John McBrewster
High Quality Content by WIKIPEDIA articles! Corrugated fiberboard is a paper-based material consisting of a fluted corrugated sheet and one or two flat linerboards. It is widely used in the manufacture of corrugated boxes and shipping containers. The corrugated medium and linerboard are made of containerboard, a paper-like material usually over ten mils (0.010 inch, or 0.25 mm) thick. Paperboard and corrugated fiberboard are sometimes called cardboard, although cardboard might be any heavy paper-pulp based board. In the mid-19th century, an ingenious concept enabled flimsy sheets of paper to be transformed into a rigid, stackable and cushioning form of packaging for delicate goods in transit. Данное издание не...
ISBN: 978-6-1337-1752-7
Издательство:
Книга по требованию
Дата выхода: июль 2011
Complex systems have reached the point where reuse is the norm rather than the exception. In an effort to address increasing complexity while maintaining manageability, systems engineers frequently leverage (or reuse) previously developed systems engineering products (i.e. requirements, test plans, interfaces, etc.) as a means of reducing development schedule, system cost, or risk; however, the effects of reuse have historically been difficult to quantify, and therefore justify. The second version of the Constructive Systems Engineering Cost Model (COSYSMO 2.0) addresses this need by providing systems engineers with a tool that enables the quantification and rationalization of the effect of reuse. The model has broad usability for and...
ISBN: 978-3-6392-8616-8
Издательство:
Книга по требованию
Дата выхода: июль 2011
This monograph presents a coupling technique for integrating EFGM with FFEM for analyzing homogeneous, two dimensional linear–elastic isotropic, and anisotropic cracked structures subjected to mixed–mode (modes I and II) loading conditions, and unbounded domain problems. The proposed method combines the best features of EFGM and FFEM, in the sense that no structured mesh or special enriched basis functions are necessary and no post–processing (employing any path independent integrals) is needed to determine fracture parameters such as SIFs and T-stress. The monograph focuses on the work carried by the second author at Indian Institute of Technology Madras, India; as a part of his doctoral study. Данное издание не...
ISBN: 978-3-8433-5214-7
Издательство:
Книга по требованию
Дата выхода: июль 2011
Due to the large difference in demand and supply of electrical energy, power cut leads to interruption in the working of cold storages which ultimately results in spoilage of vegetables. Compression refrigeration cycles are widely used in cold storages due to the higher coefficient of performance over other refrigeration systems. The most significant energy consumer of compression refrigeration system is electric motor which drives the compressor. Environmental concerns such as ozone depletion and global warming have directed the research trend towards the emergence of new refrigeration technologies. The objective of this work is to provide an energy efficient alternate cooling technology which can utilize renewable energy sources for...
ISBN: 978-3-8383-3908-5
Издательство:
Книга по требованию
Дата выхода: июль 2011
The concept of Functionally Graded Materials was proposed for severe environment application like space, thermal barrier coating etc. However, these materials had been successfully used in several fields of engineering. In these materials, properties of interest vary gradually from point to point. Understanding the fracture mechanics of these materials has been of interest to researchers to better utilize the capabilities of these materials and tailor the properties according to requirement. This work detail the fracture behavior of functionally graded material under in-plane and out-of-plane load. The numerical simulation and results of effects of material property variation on planar crack propagation have been presented. The numerical...
ISBN: 978-3-6392-2117-6
Издательство:
Книга по требованию
Дата выхода: июль 2011