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Aкусто-ем с йна система локац свищ в THE ACOUSTICS EMISSION SYSTEM OF THE CRACKS PLACE LOCATION Aкусто-эмиссионная система локации свищей  [cached]
Maksym G. Lutskiy,Aleksandr V. Ponomarenko
Proceedings of National Aviation University , 2010,
Abstract: Розглянуто структуру побудови акусто-ем с йно системи локац м сцеположення наскр зних дефект в в продуктопроводах. Показано, що використання технолог LabCard дозволя провести перерозпод л функц й м ж електронними програмними засобами системи. Наведено структуру електронних програмних засоб в, принципи формування багатор внево системи управл ння, що дозволя проводити модиф кац ю системи без зм ни електронних засоб в. Розглянуто приклади роботи програмних засоб в системи. The structure of the construction of the acoustics emission system of the place location of through defects is considered in product lines. It is shown that the use of technology of LabCard allows to conduct the redistribution of functions between electronic and programmatic facilities of the system. The structure of electronic program facilities are considered. The forming principles of the multilevel control system are shown, that allows to conduct modification of the system without the change of its electronic facilities. The examples of work of programmatic facilities of the system are resulted. Рассмотрена структура построения акусто-эмиссионной системы локации местоположения сквозных дефектов в продуктопроводах. Показано, что использование технологии Labcard позволяет провести перераспределение функций между электронными и программными средствами системы. Приведены структура электронных и програмних средств, принципы формирования многоуровневой системы управления, что позволяет проводить модификацию системы без изменения ее электронных средств. Рассмотрены примеры работы программных средств системы.
Diffusion and localization in chaotic billiards  [PDF]
Fausto Borgonovi,Giulio Casati,Baowen Li
Physics , 1996, DOI: 10.1103/PhysRevLett.77.4744
Abstract: We study analytically and numerically the classical diffusive process which takes place in a chaotic billiard. This allows to estimate the conditions under which the statistical properties of eigenvalues and eigenfunctions can be described by Random Matrix Theory. In particular the phenomenon of quantum dynamical localization should be observable in real experiments.
An aperiodic phenomenon of the unscented Kalman filter in filtering noisy chaotic signals

Fan Hongjuan,Feng Jiuchao,Xie Shengli,Wang Shiyuan,

自然科学进展 , 2007,
Abstract: A non-periodic oscillatory behavior of the unscented Kalman filter (UKF) when used to filter noisy contaminated chaotic signals is reported. We show both theoretically and experimentally that the gain of the UKF may not converge or diverge but oscillate aperiodically. More precisely, when a nonlinear system is periodic, the Kalman gain and error covariance of the UKF converge to zero. However, when the system being considered is chaotic, the Kalman gain either converges to a fixed point with a magnitude larger than zero or oscillates aperiodically.
Vortex dynamics in evolutive flows: a weakly chaotic phenomenon  [PDF]
Jacopo Bellazzini,Giulia Menconi,Guido Buresti,Paolo Grigolini,Massimiliano Ignaccolo
Physics , 2003, DOI: 10.1103/PhysRevE.68.026126
Abstract: We study the vortex dynamics in an evolutive flow. We carry out the statistical analysis of the resulting time series by means of the joint use of a compression and an entropy diffusion method. This approach to complexity makes it possible for us to establish that the time series emerging from the wavelet analysis of the vortex dynamics is a weakly chaotic process driven by a hidden dynamic process. The complexity of the hidden driving process is shown to be located at the border between the stationary and non-stationary state.
Social and place-focused communities in location-based online social networks  [PDF]
Chlo? Brown,Vincenzo Nicosia,Salvatore Scellato,Anastasios Noulas,Cecilia Mascolo
Computer Science , 2013, DOI: 10.1140/epjb/e2013-40253-6
Abstract: Thanks to widely available, cheap Internet access and the ubiquity of smartphones, millions of people around the world now use online location-based social networking services. Understanding the structural properties of these systems and their dependence upon users' habits and mobility has many potential applications, including resource recommendation and link prediction. Here, we construct and characterise social and place-focused graphs by using longitudinal information about declared social relationships and about users' visits to physical places collected from a popular online location-based social service. We show that although the social and place-focused graphs are constructed from the same data set, they have quite different structural properties. We find that the social and location-focused graphs have different global and meso-scale structure, and in particular that social and place-focused communities have negligible overlap. Consequently, group inference based on community detection performed on the social graph alone fails to isolate place-focused groups, even though these do exist in the network. By studying the evolution of tie structure within communities, we show that the time period over which location data are aggregated has a substantial impact on the stability of place-focused communities, and that information about place-based groups may be more useful for user-centric applications than that obtained from the analysis of social communities alone.
Long range action in networks of chaotic elements  [PDF]
Michael Blank,Leonid Bunimovich
Mathematics , 2005, DOI: 10.1088/0951-7715/19/2/005
Abstract: We show that under certain simple assumptions on the topology (structure) of networks of strongly interacting chaotic elements a phenomenon of long range action takes place, namely that the asymptotic (as time goes to infinity) dynamics of an arbitrary large network is completely determined by its boundary conditions. This phenomenon takes place under very mild and robust assumptions on local dynamics with short range interactions. However, we show that it is unstable with respect to arbitrarily weak local random perturbations.
Selections, Paracompactness and Compactness  [PDF]
Mitrofan M. Choban,Ekaterina P. Mihaylova,Stoyan I. Nedev
Mathematics , 2009,
Abstract: In the present paper, the Lindelof number and the degree of compactness of spaces and of the cozero-dimensional kernel of paracompact spaces are characterized in terms of selections of lower semi-continuous closed-valued mappings into complete metrizable (or discrete) spaces.
Stochastic stability versus localization in chaotic dynamical systems  [PDF]
Michael Blank,Gerhard Keller
Physics , 1996, DOI: 10.1088/0951-7715/10/1/006
Abstract: We prove stochastic stability of chaotic maps for a general class of Markov random perturbations (including singular ones) satisfying some kind of mixing conditions. One of the consequences of this statement is the proof of Ulam's conjecture about the approximation of the dynamics of a chaotic system by a finite state Markov chain. Conditions under which the localization phenomenon (i.e. stabilization of singular invariant measures) takes place are also considered. Our main tools are the so called bounded variation approach combined with the ergodic theorem of Ionescu-Tulcea and Marinescu, and a random walk argument that we apply to prove the absence of ``traps'' under the action of random perturbations.
On the splitting problem for selections  [PDF]
Maxim V. Balashov,Du?an Repov?
Mathematics , 2008, DOI: 10.1016/j.jmaa.2009.01.051
Abstract: We investigate when does the Repov\v{s}-Semenov Splitting problem for selections have an affirmative solution for continuous set-valued mappings in finite-dimensional Banach spaces. We prove that this happens when images of set-valued mappings or even their graphs are P-sets (in the sense of Balashov) or strictly convex sets. We also consider an example which shows that there is no affirmative solution of this problem even in the simplest case in $\R^{3}$. We also obtain affirmative solution of the Approximate splitting problem for Lipschitz continuous selections in the Hilbert space.
Industrial Eco-environmental Heterogeneity and Location Selections of Cultural Firms’ Inter-regional M&A

潘爱玲 吴 倩
- , 2018,
Abstract: 摘要 异地并购是文化企业克服资源约束、实现跨越式成长的重要方式。受资源需求和产业生态环境异质性的影响,文化企业异地并购的区位选择具有较大差异。本文基于资源基础理论,从政策支持、文化资源、创意要素和产业发育四个维度构建文化产业生态环境评价指标体系,以2008-2016年543起文化企业并购事件为样本,实证研究产业生态环境对文化企业异地并购偏好和绩效的影响。结果表明,受并购双方所处区域文化产业生态环境差异的影响,文化企业异地并购的区位选择偏好显著不同。从绩效表现来看,产业生态环境的改善能为文化企业带来成长效应,被并方所处区域的产业生态环境越好于主并方,文化企业并购绩效越好,但这种成长效应只存在于国有文化企业作为主并方的异地并购中。进一步考察企业的绩效产生机制,发现外部环境的增量支持可有效降低国有文化企业的营业成本。本文的结论对文化企业科学选择并购区位以及政府优化投资环境、提升引资效率具有借鉴意义。
Abstract:Inter-regional M&A is an important way to mitigate cultural firms’ resource constraints and realize their great-leap-forward development. Affected by the heterogeneity of the regional industrial environment, the location selections of cultural firms in M&As are quite different. Based on resource-based theory, this paper constructs an index system of regional environmental assessment from the four dimensions of policy support, cultural resources, creative elements and industrial development and uses the data of 543 M&A events from 2008 to 2016 to exploit the impact of regional industrial environment on cultural firms’ M&A location choices and performance. The results suggest that the industrial eco-environment has significantly affected the cultural firms’ M&A activities. Considering the M&A performance, the improvement of the industrial eco-environment can bring growth effects to cultural firms. The better the environment where the target is located, the better the M&A performance of the acquirer, but the growth effect only exists in the M&A which the state-owned cultural firm as the acquirer. Further examine the mechanism of firms’ performance, and finds that the incremental support of the external environment can effectively reduce the operating costs of state-owned cultural firms. The findings have important reference for cultural firms’ regional selections and government to optimize the investment environment.
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