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The present short monograph concerns analytic and semi-analytic techniques for finding an approximate value of the limit load. The limit load is an essential input parameter of flaw assessment procedures. In most cases, finding the limit load involves some numerical calculations of different levels of complexity, including numerical minimization of functions of one or several arguments, the slip-line technique and the finite element method. This book shows in particular how to use singular behavior of the real velocity field in the vicinity of bi-material interfaces in kinematically admissible velocity fields to increase the accuracy of upper bound solutions. An approach to recalculate the limit load for a class of structures with defects with the use of its value for the corresponding structure with no defect is discussed. The upper bound technique is applied to evaluate the limit load of overmatched and undermatched welded joints with cracks subject to various loading conditions of practical importance in conjunction with the aforementioned special techniques.

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Erscheinungsdatum: 05/2012, Medium: Taschenbuch, Einband: Kartoniert / Broschiert, Titel: Upper Bound Limit Load Solutions for Welded Joints with Cracks, Autor: Alexandrov, Sergey, Verlag: Springer-Verlag GmbH // Springer Berlin, Sprache: Englisch, Schlagworte: Mechanik // Arbeitsstoff // Material // Werkstoff // Mathematik // Ingenieurwissenschaft // Ingenieurwissenschaftler // Maschinenbau // Materialprüfung // Körper // physikalisch // Festkörper // Zahl // Zählen // Zahlensystem // Ziffer // Ingenieurswesen // Maschinenbau allgemein // Werkstoffprüfung // Klassische Mechanik // Wahrscheinlichkeitsrechnung und Statistik // Maschinenbau: Festkörpermechanik // Zahlensysteme, Rubrik: Maschinenbau // Fertigungstechnik, Seiten: 117, Herkunft: NIEDERLANDE (NL), Reihe: SpringerBriefs in Applied Sciences and Technology, Informationen: Book, Gewicht: 216 gr, Verkäufer: averdo

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As airlines frequently have heavy costs and are capital intensive, the efficiency with which aircrafts are scheduled is crucially important. Efficient fleet utilization is characterized by how many percent of the airplanes' carrying capacity is filled with payload. Load factor is the best measure of performance in airline industry. In this book, Aircraft are scheduled based on their contribution to the load factor.It is tried to include as many variables as possible in the mathematical formulation to model the actual airline operation. The branch and bound algorithm is used to solve the linear binary problem where the revised simplex method is applied to solve its linear relaxation. Computer program is also developed to read inputs, solve and export outputs to the desired format. Finally, solution results show that load factor can be improved by applying the proposed model. In general, airline operators can raise their performance by implementing such a scheduling system.

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The AD8310 is a complete, dc to 440 MHz demodulating logarithmic amplifier (log amp) with a very fast voltage mode output, capable of driving up to 25 mA into a grounded load in under 15 ns. It uses the progressive compression (successive detection) technique to provide a dynamic range of up to 95 dB to ±3 dB law conformance or 90 dB to a ±1 dB error bound up to 100 MHz. It is extremely stable and easy to use, requiring no significant external components. A single-supply voltage of 2.7 V to 5.5 V at 8 mA is needed, corresponding to a power consumption of only 24 mW at 3 V. A fast-acting CMOS-compatible enable pin is provided.

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There are a number of civil engineering structures, for which circular and ring footings are often employed. The bearing capacity was computed for a rough circular and ring footings by using the method of characteristics. Rapid urbanization coupled with scarcity of land force several structures to come up ever closer to each other, which may sometime cause severe damage to the structures and therefore, a need is felt to devise simplified methods to capture the effect of footing interference. The ultimate bearing capacity of two interfering strip footings was obtained by using the method of characteristics and the upper bound limit analysis. The determination of the ultimate bearing capacity of shallow to deep footings must incorporate the shearing resistance of the soil mass above the footing level otherwise the predicted failure load becomes conservative. By incorporating the shear strength of the soil mass above the footing level, it was intended to perform an analysis so as to compute the bearing capacity factors for a rough strip footing placed on a sloping ground surface at different depths under seismic condition by using the upper bound limit analysis.

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Electric Transmission System basically takes the power from power plant and transfer it to a substation installed near a populated area. The electric power is transmitted over long cables called Transmission Lines. These transmission lines travel a distance of hundreds of kms to carry the power from generating station to load center. Over such a wide range of transmission network, faults are bound to occur. Fault is an abnormal condition in which the undesired value of current flow through an unintended path. These faults need to be sensed and faulty part should be disconnected from the system quickly so as to stop such high current to flow for considerable period of time and cause overheating and insulation failure in the equipments as well as to restore continuity of power quickly.

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