Papers by Keyword: Impulse Response

Abstract: The article describes the method of determining the hydroacoustic channel impulse response using signals modulated by pseudo-random sequence. Moreover, exemplary impulse responses determined in the laboratory conditions were presented.

Abstract: Maximum Length Sequence has great potential as testing signal in non-destructive testing. Because its autocorrelation is almost a delta function, the sequence can be used for speed of sound assessment. Resulting Impulse response contains very similar data as Impact-echo. Unlike Impact-echo, where strike energy is limited by nonlinear effects, Maximum Length Sequence can deliver virtually unlimited energy over time. Length of the sequence and also signal generation rate is a curtail choice in order to achieve the best results.

Abstract: Using statistical data from year 2003 to 2011, this paper computes the location quotient and cluster scale of Jiangsu textiles industry, which shows a remarkable cluster tendency. Unit root test and Granger cause-effect test show that in the short run, neither did Jiangsu textiles export has a remarkable positive impact on enhancing Jiangsu textiles cluster, nor did Jiangsu textiles cluster has a remarkable positive impact on enhancing Jiangsu textiles. And impulse response ascertains a long and dynamic relationship between them.

Abstract: Based on the statistical data of US from the year 1977 to 2006, this paper examines the long-run equilibrium relationship and short-term fluctuations among power grid investment, economy and electricity consumption by employing the recently developed VAR model and cointegration theory. The results show that the electricity consumption has a positive effect on power grid investment while GDP has a negative impact. The development of electric power grid investment can be divided into three stages. To achieve the coordinate development of electricity and economy, the electric power industrial should develop in advance and try to be a new pillar industry.

Abstract: Using co-integration analysis, Granger causality test, and impulse response analysis in an integrated way, this paper makes empirical study of the impact on China’s carbon emission by its urban construction land expansion. The result shows that there is a long-run equilibrium relationship between carbon emission and urban construction land expansion in China, with the latter being the Granger cause of the increase in carbon emission. However, the impact process shows a lagging nature. The impact effect is not so evident in a short term, but is rather significant in a long term (five to ten years). To reduce its carbon emission, China should optimize its urban development mode and control the scale of urban development reasonably, especially focusing on the economical and intensive use of land and upgrading of industrial structure, so as to reduce energy consumption by its urban expansion, check excessive increase in carbon emission, and promote the sustainable urbanization.

Abstract: Passive control and semi-active control of vibration in mechanical systems have recently successfully been used in automobiles and airplanes suspension systems. These control techniques are able to guarantee the performances of all vibration structures. Unfortunately, the knowledge and data has not been readily applied to human prosthetics. The information collected can be directly applied to accelerate research into dampening for prosthetics. A focus of this paper is on modeling and controlling vibrations by a given impulse onto prosthetic legs. Simulations of using passive control and idealized skyhook dampening are using Matlab to complete. Through model analysis, control variable, simulation procedures and comparison of two modeling, the models have been refined and with idealized skyhook dampening suspension provide significant improvement of the body characteristics compared with passive suspensions.

Abstract: This article presents the results of analysis of impulse responses which were obtained from in situ measurement in sports hall called Karlovka. The experiment deals with the comparison of two positions of the measuring microphone which had the identical distance from the sound source and the reverberation time was different in the whole frequency range. The attention was focused on the analysis of suitability of Reverberation time RT, Strength G and Clarity C₈₀ to be used for the assessment of sports halls.

Abstract: Energy is the foundation of economy for China. The economic growth depends on energy, but recent years, the carbon dioxide from energy consumption hinders the GDP to grow. Environment starts to affect economic growth and it becomes a restriction to energy consumption. Energy, economy and environment have formed a new system which is called 3E system, so its practical to study the dynamical relationships among the 3E system. This paper selects annual data from 1970 to 2009 to establish a VEC model and takes the impulse response function and variance analysis to analyze the short-term dynamical relationship of Chinas 3E system, finding that there is at least one co-integration relationship among 3E system in China. Finally, this paper discusses how the energy, economy, and environment affect each other in short term from a quantitative perspective and intends to provide some advices to draft applicable energy policy for China.

Abstract: Analyzed the dynamic interaction characteristics of Chongqing Economic growth and energy consumption between 1980-2011 based on vector auto regression model, impulse response function. The results showed that: 1 Between the Chongqing's economic growth and energy consumption exist the positive long-term stable equilibrium relationship, Chongqing's economic development depending on energy consumption is too high, to keep the economy in Chongqing's rapid economic development, energy relatively insufficient supply sustainable development must rely on the energy market, which will restrict the development of Chongqing's economy. 2At this stage, Chongqing continuing emphasis on optimizing the industrial structure to improve energy efficiency at the same time, the key is to establish and improve the energy consumption intensity and total energy demand "dual control" under the security system, weakening the energy bottleneck effect on economic growth.

Abstract: The international financial crisis has caused broad impact and serious consequences to international economic order and the economic development of every country. Therefore, making modeling research on the effect of crisis contagion between some economic markets in order to take timely measures to prevent the further spread of contagion is of great significance for maintaining a countrys economic security, and the stability of global economic and financial system. To prevent economy from being destroyed by financial crisis contagion, this paper puts forward a new testing approach on the contagion effect of financial crisis. This approach is to test the contagion effect of financial crisis by examining whether the conditional variances of different countries financial markets in crisis period are correlated through Generalized Autoregressive Conditional Heteroskedasticity model. Empirical study shows that, this new approach is effective and practical in testing the contagion effect of financial crisis.