Search results for "Civil Engineering"
showing 10 items of 1216 documents
Highly Magnetized Accreting Pulsars: Are There Accreting Magnetars?
2014
2S 0114+650, GX 301-2, IGR J16358-4726, X Per, 4U 2206+54, SXP 1062, and 3A 1954+319 are thought to possess high magnetic elds. They have recently been named accreting magnetars, or highly magnetized accreting pulsars. In this work their properties are reviewed. Within the context of their observational properties (mainly from INTEGRAL data), and the recent models of accretion onto highly magnetized neutron stars, their similarities and dierences are analyzed. The aim is to find a common framework to understand the evolution (in terms of past and present history) of these sources, and to establish the basis of a possible new kind of accreting sources. Two of these sources, namely X Per and …
The multiple slope discontinuity beam element for nonlinear analysis of RC framed structures
2018
The seismic nonlinear response of reinforced concrete structures permits to identify critical zones of an existing structure and to better plan its rehabilitation process. It is obtained by performing finite element analysis using numerical models classifiable into two categories: lumped plasticity models and distributed plasticity models. The present work is devoted to the implementation, in a finite element environment, of an elastoplastic Euler–Bernoulli beam element showing possible slope discontinuities at any position along the beam span, in the framework of a modified lumped plasticity. The differential equation of an Euler–Bernoulli beam element under static loads in presence of mul…
On the Multipeakon Dissipative Behavior of the Modified Coupled Camassa-Holm Model for Shallow Water System
2013
Published version of an article in the journal: Mathematical Problems in Engineering. Also available from the publisher at: http://dx.doi.org/10.1155/2013/107450 Open Access This paper investigates the multipeakon dissipative behavior of the modified coupled two-component Camassa-Holm system arisen from shallow water waves moving. To tackle this problem, we convert the original partial differential equations into a set of new differential equations by using skillfully defined characteristic and variables. Such treatment allows for the construction of the multipeakon solutions for the system. The peakon-antipeakon collisions as well as the dissipative behavior (energy loss) after wave breaki…
BOOTES observation of GRB 080603B
2012
We report on multicolor photometry of long GRB080603B afterglow from BOOTES-1B and BOOTES-2. The optical afterglow has already been reported to present a break in the optical lightcurve at 0.12 ± 0.2 days after the trigger. We construct the lightcurve and the spectral energy distribution and discuss the nature of the afterglow.
Finite Frequency Vibration Control for Polytopic Active Suspensions via Dynamic Output Feedback
2013
This paper presents a disturbance attenuation strategy for active suspension systems with frequency band constraints, where dynamic output feedback control is employed in consideration that not all the state variables can be measured on-line. In view of the fact that human are sensitive to the virbation between 4–8 Hz in vertical direction, the control based on generalized Kalman-Yakubovich-Popov (KYP) lemma is developed in this specific frequency, in order to achieve the targeted disturbance attenuation. Moreover, practical constraints required in active suspension design are guaranteed in the whole time domain. At the end of the paper, the outstanding performance of the system using finit…
Experimental studies of a single flexibly-mounted rod in a triangular rod bundle in cross-flow
2018
Experiments on flow-induced vibrations using a closely-packed triangular rod array with a pitch-todiameter ratio of 1.1 in water cross-flow was carried out at Paul Scherrer Institute. The bundle consists of 21 row of five rods in each one. Single flexibly-mounted test rod (TR) is in the fourth row in an otherwise fixed array. The test rod can freely move in the transverse and in-line direction. Two accelerometer sensors were attached at both ends of the TR to measure the rod response on the fluid flow. The effect of flow rate on the stability of the flexibly-mounted TR has been analysed. During experiments, it reveals a set of conditions and tendencies for the flow-induced vibration in the …
EXPERIMENTAL STUDY ON THE FLUID FLOWIN THE CONDUCTS
2018
Fluids are high mobility environments that, under the action of external forces, are continuously and irreversibly deformed. The flow of fluid through a pipe is ensured by a pressure difference between its ends. The presented paper aims to experimentally determine the velocity profile of flowing a Newtonian fluid through a circular section pipe by measuring the local speed at five points on the pipe radius.
Risk of failure for the salso river railroad steel bridge
2020
Abstract The degradation state of railroad steel bridges is one of the most important and difficult aspects to be interpreted. The use of steel bridges started from 1900, and they are still in service today as railroad bridges. The case study examined was that of a bridge railroad steel bridge having a total length of 112 m and constituted by three isostatic, reticular beams having a Pratt type composition. The substructures (two shoulders and two intermediate piles) are in masonry with a reinforced concrete beam in the upper portion. The structure (steel bridge and piers) is in a degraded state. To determine the degradation level, non-destructive and partially destructive tests were carrie…
Pilsētas izbūves jautājums: referātu slēdzieni
1926
Saturs: Dzīvokļu jautājums lielpilsētās un dārzu pilsētās sakarā ar agrārreformu: slēdzieni / arch. K. Pēkšēns -- Mirstība un vidējā mūža garums lielpilsētās un uz laukiem: slēdzieni / prof. K. Balodis -- Pilsētu izbūves plānu pamatvilcieni: slēdzieni / inž. A. Lamze -- Pilsētu atklāto dārzu un zāļvietu uzdevumi un viņu iekārtas principi: slēdzieni / A. Zeidaks -- Pilsētu sanitārās labierīcības: slēdzieni / inž. M. Bīmanis -- Pilsētas satiksmes ceļi: slēdzieni / būvinž Fr. Efferts -- Pilsētu uzmērīšana Latvijā: slēdzieni / inž. D. Vanags -- „Pilsētu un miestu plānošana Latvijā“, pēc zemju departamenta darbiem no 1920.-1924. g.: slēdzieni / inž. L .Maydells.
Bericht über die Vorarbeiten für die systematische Entwässerung und Reinigung der Stadt Riga [...Vorarbeiten für die systematische Entwässerung und R…
1886
Inhalt: I. Rigas Witterungsverhältnisse nebst einem Anhang: Wasserstand und Eisbedeckung der Düna bei Riga ; II. Chemisch-analytische und mikroskopische Untersuchung des Bodens, des Grundwassers und einiger Brunnen und offenen Gewässer der Stadt Riga ; III. Erläuterungsbericht zu den Messungen zur Bestimmung der Terraingestaltung, der Höhenlage und der Schwankungen des Grundwasserstandes, sowie der Wasserquantitäten und Durchfussgeschwindigkeiten der offenen Gewässer der Stadt Riga ; IV. Angaben über das gegenwärtig in Riga in Gebrauch befindliche Verfahren zur Reinigung und entwässerung der Stadt, nebst einer Beschreibung der im Stadtgebiet vorhandenen Ableitungsanlagen ; V. Beschreibung d…