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Stimulate economic growth by improving transport infrastructure – a lesson from China

Wang X., Deng D., Wu X.

Transport Problems

2014

T. 9, z. 4

63--72

This paper uses Feder model to test impacts of transport infrastructure on economic growth. With China provincial data from 1990-2010 the empirical models, including Basic model, Time-Lag model and Spatial model, demonstrate that transport infrastructure does have a positive Spillover Effect on economic growth. However, Direct Effect on economic growth is negative possibly due to Crowding-Out Effect and productivity difference between sectors. The research also proves the Spillover Effects are becoming weaker as time passed. Finally, Spatial Spillover Effect or Network Effects are confirmed.

Diese Thesis benutzt Feder-Model, um die Auswirkung der Transportinfrastruktur, die auf das wirtschaftliche Wachstum zu untersuchen. Mit den Daten aus chinesischen Provinzen zwischen 1990 und 2010 durch das empirische Modell, in dem das Basic-Model, Time-Lag-Model und Spatial-Model beinhaltet, kann man dadurch demonstrieren, dass die Transportinfrastruktur eine positive Spillover-Effekt auf das wirtschaftliche Wachstum auswirkt. Direkte Effekt auf das wirtschaftliche Wachstum ist jedoch möglich negativ, durch die Crowding-Out Effekt und Unausgeglichenheit der Produktivität zwischen Sektoren. Diese Studie beweist auch, dass die Spillover-Effekte mit vergangener Zeit schwächt wird. Außerdem werden die Spatial-Spillover-Effekt oder Network-Effekt nachgewiesen.

Ultrasonic Phased Array Inspection for Gas Pressure Welds Joint of High Speed Railway

Lu C., Deng D., Li L.

Przegląd Elektrotechniczny

2012

R. 88, nr 1b

173-176

Ultrasonic phased arrays offer many advantages for industrial inspection due to increased flexibility over methods involving single-element probes. This paper will compare and contrast two previously-developed methods for the inspection of gas pressure rail welds involving phased arrays: the swept sector scan and the total focusing method, with particular emphasis on the latter. The total focusing method requires the acquisition of the full data set of time-domain signals from every possible send-receive combination in an ultrasonic array and the computation of time delay laws that will allow focusing at the post-processing stage. While applying conventional single probe ultrasound tests methods to detect the gas pressure rail welds, it is needed to use various beam angles for different detecting regions, resulting in long time and low efficiency of testing process. In comparison, ultrasonic phased array technique has the advantage of flexibly adjusting scan angle so as to improve testing efficiency. By using the CTS-602 type phased array instrument and trails on the gas pressure welding rail joint sample with artificial defects, the reasonable inspection parameters and testing programs could be determined, Experiments results show that the ultrasonic phased array inspection provides excellent test quality and good test efficiency. Based on combination of S-scan and B-scan plotted into 2-D isometric part, the defects features could be reconstructed and measured into a soft package. Comparison between A-scan plotted data and S-scan image data of defect sizes and position are also presented.

Przedstawiono fazowa matrycę ultradźwiękową do przemysłowego badania nieniszczącego. Porównano różne systemy do badania połączeń spawanych w systemach kolejowych. System wymaga zebrania całego zestawu danych z matrycy ultradźwiękowej a następnie przetwarzania numerycznego danych. W proponowanym systemie nie jest konieczne badanie spawu pod wieloma kątami co zwykle jest czasochłonne.