oalib
Search Results: 1 - 10 of 100 matches for " "
All listed articles are free for downloading (OA Articles)
Page 1 /100
Display every page Item
Bruhat-Tits buildings and analytic geometry  [PDF]
Bertrand Remy,Amaury Thuillier,Annette Werner
Mathematics , 2011,
Abstract: This paper provides an overview of the theory of Bruhat-Tits buildings. Besides, we explain how Bruhat-Tits buildings can be realized inside Berkovich spaces. In this way, Berkovich analytic geometry canbe used to compactify buildings. We discuss in detail the example of the special linear group. Moreover, we give an intrinsic description of Bruhat-Tits buildings in the framework of non-Archimedean analytic geometry.
Developing Dynamic Digital Image Correlation Technique to Monitor Structural Damage of Old Buildings under External Excitation  [PDF]
Ming-Hsiang Shih,Wen-Pei Sung
Shock and Vibration , 2014, DOI: 10.1155/2014/954840
Abstract: The capacity of buildings to resist external excitation is an important factor to consider for the structural design of buildings. When subject to external excitation, a building may suffer a certain degree of damages, and its residual capacity to resist external excitation cannot be evaluated. In this research, dynamic digital image correlation method combined with parameter evaluation available in system identification is used to evaluate the structural capacity to resist external excitation. The results reveal possible building latent safety problems so that timely structural reinforcement or dismantling of the building can be initiated to alleviate further damages. The results of experiments using the proposed method conform to the results obtained using the conventional method, but this method is more convenient and rapid than the latter in the subsequent procedure of data processing. If only the frequency change is used, the damages suffered by the building can be detected, but the damage location is not revealed. The interstory drift mode shape (IDMS) based on the characteristic of story drift has higher sensitivity than the approximate story damage index (ADSI) method based on modal frequency and vibration type; however, both indices can be used to determine the degree and location of building damages. 1. Introduction The life cycle of a civil engineering structure includes the steps of development and construction, application and maintenance, and demolition and removal. Enhancing the functional characteristics of materials and applying new construction technology during the construction period will improve the quality, the functions, and the safety of the structure. However, before a structure reaches its designed life cycle, its structural functions need to be evaluated during the various stages of application; the results will be referenced for conducting structural maintenance and/or reinforcement. In recent years, the record breaking earthquakes of Richter Scale 9 and the aftermath tsunami such as those that have occurred in Indonesia and Japan are profoundly impressive [1, 2]. The global warming will lead to more natural disasters in the future so that the evaluation of building capability to resist external excitation should be emphasized for the safety of the occupants. Although a building has been designed to resist external excitation of certain intensities, it may suffer a certain degree of damage to weaken the building and reduce its quake-resisting capability. In particular, Taiwan is located in the Pacific seismic belt and there
Grobner fan for analytic D-modules with parameters  [PDF]
Rouchdi Bahloul
Mathematics , 2003,
Abstract: This is the first part of a work dedicated to the study of Bernstein-Sato polynomials for several analytic functions depending on parameters. The main result of this part is a constructibility result for the analytic Gr\"obner fan of a parametric ideal in the ring of analytic differential operators. In this part, the main tool is the notion of generic reduced standard basis.
Assessment of Performance Based Parameters in Near Fault Tall Buildings  [PDF]
A. Mohammadjafari,A. Jalali
Journal of Applied Sciences , 2009,
Abstract: Available codes are not well-suited for tall buildings and are very restrictive. In this study, we try to assess parameters such as drift limits, rotation of plastic hinge, capacity-demand ratio, etc. which have a significant role in defining performance levels for near-fault regions. We have selected two-dimensional steel moment resisting frames having 30, 40 and 50 stories. These buildings have been designed according to IBC and AISC practice codes as Special Moment Resisting Frames (SMRF) and have been analyzed by Design Spectrum Analysis (DSA). We have conducted nonlinear dynamic time history analyses by using a suite of near-fault accelerograms to assess the performances of selected buildings. Finally performance levels of structures have been evaluated and estimated and near fault effects on different parameters which are not completely considered in spectral analysis are assessed. Using nonlinear analysis and evaluating performance levels and assessing parameters such as drifts and formation of plastic hinges and their rotations quantities, ratios of capacity-demand, etc. some weak points of customary design method are detected.
Analytic Solutions to the RG Equations of the Neutrino Physical Parameters  [PDF]
N. Haba,Y. Matsui,N. Okamura
Physics , 1999, DOI: 10.1143/PTP.103.807
Abstract: In the case of two generation neutrinos, the energy-scale dependence of the lepton-flavor mixing matrix with Majorana phase can be governed by only one parameter r, which is the ratio between the diagonal elements of neutrino mass matrix. By using this parameter r, we derive the analytic solutions to the renormalization group equations of the physical parameters, which are the mixing angle, Majorana phase, and the ratio of the mass-squared difference to the mass squared of the heaviest neutrino. The energy-scale dependence of the Majorana phase is clarified by using these analytic solutions. The instability of the Majorana phase causes in the same parameter region in which the mixing angle is unstable against quantum corrections.
Using the Analytic Hierarchical Process to Define Choices for Re-Using Rural Buildings: Application to an Abandoned Village in Sicily  [PDF]
Patrizia Russo, Lara Riguccio, Laura Carullo, Giovanna Tomaselli
Natural Resources (NR) , 2013, DOI: 10.4236/nr.2013.44039
Abstract:

It has been recognised for some time that traditional rural buildings are a cultural and/or practical “resource” of the countryside. Inappropriate re-conversions can result in the waste of valuable economic resources and the loss of local heritage. Thus, before reconstruction is started the possible types of re-use should be accurately evaluated. This work develops a method, based on the Analytic Hierarchy Process, for identifying the best re-use of an abandoned village that was built in the first half of the last century. The method uses the guidelines of the countryside plan, and our work is a case study designed to verify whether or not it is suitable in this context. Five requisites for sustainable intervention were identified, as well as three alternative re-uses and five indicators. The hierarchical analysis was developed using two different approaches, one used three hierarchical levels, and the other used four. The results obtained for both approaches agree in suggesting the same model for re-use, but the four level approaches also supplied additional information which would be useful when planning projects with major social and cultural impact.

Analytic solution to the motion of the mass-spring oscillator subjected to external force  [PDF]
Youtian Zhang
Physics , 2015,
Abstract: The non-evanescent vibration, evanescent vibration and forced vibration of an oscillator attached to the massless spring are always discussed in general mechanics courses. In this article, we focus on the heavy-spring conditions. We first investigate the general situation where both viscous resistance and applied force are considered under the perspective of the renormalization group theory. Then we deal with the special case where renormalization method fails to work. We use analytic method to study the evanescent vibration of an oscillator attached to the heavy spring. Generalized orthogonal and over-complete base set is established. Two independent vibration modes indicate the vibrational frequency becomes bigger than simple harmonic oscillator if the mass of spring is considered.
Thermal properties of the vernacular buildings envelopes: the case of the "Sassi di Matera" and "Trulli di Alberobello"
Nicola Cardinale, Gianluca Rospi, Pietro Stefanizzi, Valentina Augenti
International Journal of Energy and Environment , 2011,
Abstract: The stone and the clay are the basic elements of the existing architectural heritage in the Mediterranean area, both historical and monumental. The study cases taken into account are the "Sassi of Matera" and the "Trulli of Alberobello." The thermohygrometric performances of the "Tufo of Matera" (commonly denoted as calcarenite sandstone) and the "Stone of Fasano" (commonly denoted as calcareous stone), which are the base materials of the buildings "Sassi" and "Trulli", were quantified through measurements in situ, realized with nondestructive methodology and analyses in laboratory. The behavior of these constructions has finally been better described with dynamic simulations developed by the software EnergyPlus. This study demonstrated that the thermal mass of these structures mainly affect the indoor microclimate, stabilizing the inside temperatures and thus annulling the great thermal daily oscillations of the external temperature. The results of the measurements and numerical simulations confirmed that the seasonal thermal storage of these structures allows comfortable temperatures during the summer season, with values below 26 C, and stabilizes the indoor temperatures during the winter season, through the release of the heat stored during warm season.
Microclimate monitoring as a basis for creation of effective systems and the building with minimal energy consumption
A.G. Sotnikov
Magazine of Civil Engineering , 2010,
Abstract: Microclimate monitoring for public and industrial buildings is principal and single way to determine actual loads that are usually far from design values, and to determine air parameters. The method of thermo-, moisture-, steam- and gas-air balances is little known for designers and so unclaimed. But the information that could be received is objective and is a basis for design of passive buildings.
Microclimate depending on solar radiation
Ji?í Labudek,Lenka Michnová,Lubomír Martiník,Marcela ?erníková
GRANT journal , 2012,
Abstract: In the project “SP2011/182-Gradient temperature and airflow changes in the transparent shell caused by solar radiation” a long-time measurements in space of emergency staircase near transparent facade shell were taken. The effect of global solar radiation on the microclimate and the thermal stability of the internal environment were monitored. The paper is based on the values obtained from the current measurements in the period May - August 2011.
Page 1 /100
Display every page Item


Home
Copyright © 2008-2017 Open Access Library. All rights reserved.