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The Use of Bituminous Subballast on Future High-Speed Lines in Spain
P. F. Teixeira,P. A. Ferreira,A. Lopez Pita,C. Casas,A. Bachiller 한국철도학회 2009 International Journal of Railway Vol.2 No.1
The development of structural solutions for high-speed or very high-speed tracks that minimize total life cycle costs of the system is a key issue to improve the operational profitability of new investments. In opposition to conventional ballasted tracks, slab track solutions can be a cost-effective solution, but only in the cases where the benefits due to the increase in track availability and the reduction of track maintenance offsets its much higher construction costs. In the cases where such investment is not feasible, it is worth to evaluate possible structural improvements to ballasted track that allow reducing its maintenance needs without increasing too much its construction costs. This paper evaluates the design requirements and the impact of improving conventional high-speed ballasted tracks by using a bituminous subballast layer. It is divided into two main parts: first the design requirements of the structural solutions with bituminous subballast and its possible benefits on high-speed track deterioration, and secondly the evaluation of the economic impact, in terms of construction costs, of using this structural solution material in future Spanish high-speed lines.
Teixeira, P.F.,Ferreira, P.A.,Pita, A. Lopez,Casas, C.,Bachiller, A. The Korean Society for Railway 2009 International Journal of Railway Vol.2 No.1
The development of structural solutions for high-speed or very high-speed tracks that minimize total life cycle costs of the system is a key issue to improve the operational profitability of new investments. In opposition to conventional ballasted tracks, slab track solutions can be a cost-effective solution, but only in the cases where the benefits due to the increase in track availability and the reduction of track maintenance offsets its much higher construction costs. In the cases where such investment is not feasible, it is worth to evaluate possible structural improvements to ballasted track that allow reducing its maintenance needs without increasing too much its construction costs. This paper evaluates the design requirements and the impact of improving conventional high-speed ballasted tracks by using a bituminous subballast layer. It is divided into two main parts: first the design requirements of the structural solutions with bituminous subballast and its possible benefits on high-speed track deterioration, and secondly the evaluation of the economic impact, in terms of construction costs, of using this structural solution material in future Spanish high-speed lines.
( Alvaro G. Morales Taboada ),( Jose Manuel Asencio Pascual ),( Pablo Lozano Lominchar ),( Jose Angel Lopez Baena ),( Enrique Velasco ),( Luis Rodriguez-bachiller ),( Benjamin Diaz Zorita ),( Arturo C 대한간학회 2018 춘·추계 학술대회 (KASL) Vol.2018 No.1
Aims: To analyze the impact of multimodal treatment strategy with neoadjuvant chemotherapy and intraoperative radiation therapy (IORT), on overall median survival in patients with pancreatic cancer. Methods: We analyzed 128 patients, from 1995 to 2016, who underwent multimodal treatment with and without neoadjuvant chemotherapy, surgery and intraoperative radiation therapy (IORT). The patients were stratified in two groups based in multimodality therapy. The data analyses were carried out using the chi-squared test, and the median survival was estimated according to the Kaplan-Meier method. Results: The mean age was 65 years, 71 men (55%) and 58 women (45%), the mean follow-up was 32.5 months with a median of 15.5 months. 19.5% received complete treatment and 41 patients were also treated with IORT, 23 patients (56.1%) were treated as part of the multimodal treatment versus 18 (43.9%), P=<0.001). The overall survival was 57.90 +/- 12.59 months for the neoadjuvant treatment group compared to 39.05 +/- 6.76 months in the control group without neoadjuvant treatment, (P=0, 05). IORT vs Not IORT was 62.05 +/- 13.34 months VS 38.65 +/- 6.58 months, P=0.027 respectively. Conclusions: Neoadjuvant and local therapy with intraoperative radiation therapy (IORT) are feasible strategies and associated with a longer overall median survival.