| |
|
|
|
|
|
|
|
|
1. |
Record Nr. |
UNINA9910299921803321 |
|
|
Autore |
Li Dan |
|
|
Titolo |
Rail Crack Monitoring Using Acoustic Emission Technique / / by Dan Li |
|
|
|
|
|
Pubbl/distr/stampa |
|
|
Singapore : , : Springer Singapore : , : Imprint : Springer, , 2018 |
|
|
|
|
|
|
|
ISBN |
|
|
|
|
|
|
Edizione |
[1st ed. 2018.] |
|
|
|
|
|
Descrizione fisica |
|
1 online resource (157 pages) |
|
|
|
|
|
|
Collana |
|
Springer Theses, Recognizing Outstanding Ph.D. Research, , 2190-5053 |
|
|
|
|
|
|
|
|
Disciplina |
|
|
|
|
|
|
Soggetti |
|
Acoustical engineering |
Materials science |
Acoustics |
Engineering Acoustics |
Characterization and Evaluation of Materials |
|
|
|
|
|
|
|
|
Lingua di pubblicazione |
|
|
|
|
|
|
Formato |
Materiale a stampa |
|
|
|
|
|
Livello bibliografico |
Monografia |
|
|
|
|
|
Nota di contenuto |
|
Introduction -- Literature review -- Propagation features and source location -- Sizing of fatigue cracks -- Field monitoring of rail cracks -- Conclusions and future work. |
|
|
|
|
|
|
|
|
Sommario/riassunto |
|
This thesis provides an innovative strategy for rail crack monitoring using the acoustic emission (AE) technique. The field study presented is a significant improvement on laboratory studies in the literature in terms of complex rail profile and crack conditions as well as high operational noise. AE waves induced by crack propagation, crack closure, wheel-rail impact and operational noise were obtained through a series of laboratory and field tests, and analyzed by wavelet transform (WT) and synchrosqueezed wavelet transform (SWT). A wavelet power-based index and the enhanced SWT scalogram were sequentially proposed to classify AE waves induced by different mechanisms according to their energy distributions in the time–frequency domain. A novel crack sizing method taking advantage of crack closure-induced AE waves was developed based on fatigue tests in the laboratory. The propagation characteristics of AE waves in the rail were investigated, and Tsallis synchrosqueezed wavelet entropy (TSWE) with time was finally brought forward to detect and locate rail |
|
|
|
|
|
|
|
|
|
|
|
|
|
cracks in the field. The proposed strategy for detection, location and sizing of rail cracks helps to ensure the safe and smooth operation of the railway system. This thesis is of interest to graduate students, researchers and practitioners in the area of structural health monitoring. |
|
|
|
|
|
|
2. |
Record Nr. |
UNINA9910261094203321 |
|
|
Autore |
Tschernjajew Anatolij |
|
|
Titolo |
Michail Gorbatschow und die deutsche Frage : Sowjetische Dokumente 1986-1991 / / Aleksandr Galkin, Anatolij Tschernjajew |
|
|
|
|
|
|
|
Pubbl/distr/stampa |
|
|
De Gruyter, 2011 |
|
Berlin ; ; Boston : , : Oldenbourg Wissenschaftsverlag, , [2012] |
|
©2011 |
|
|
|
|
|
|
|
|
|
Edizione |
[1st ed.] |
|
|
|
|
|
Descrizione fisica |
|
1 online resource (676 pages) : illustrations |
|
|
|
|
|
|
Collana |
|
Quellen und Darstellungen zur Zeitgeschichte ; ; 83 |
|
|
|
|
|
|
Classificazione |
|
HIS000000HIS014000HIS037070 |
|
|
|
|
|
|
Disciplina |
|
|
|
|
|
|
Soggetti |
|
Helmut Kohl |
Michail Gorbatschow |
Wiedervereinigung |
HISTORY / General |
Soviet Union Politics and government 1985-1991 Sources |
Soviet Union Foreign relations Germany Sources |
|
|
|
|
|
|
|
|
Lingua di pubblicazione |
|
|
|
|
|
|
Formato |
Materiale a stampa |
|
|
|
|
|
Livello bibliografico |
Monografia |
|
|
|
|
|
Note generali |
|
Bibliographic Level Mode of Issuance: Monograph |
|
|
|
|
|
|
Nota di bibliografia |
|
Includes bibliographical references. |
|
|
|
|
|
|
Nota di contenuto |
|
Front Matter -- Dokumente -- 1986 -- 1987 -- 1988 -- 1989 -- 1990 -- 1991 -- Back Matter |
|
|
|
|
|
|
|
|
Sommario/riassunto |
|
im Prozess der deutschen Wiedervereinigung spielte die Sowjetunion eine zentrale Rolle. Die wesentlichen Dokumente aus dem innersten Machtzirkel der UdSSR, die Motive und Entscheidungsfindungen des Kreml beleuchten, waren indes bislang nur einem kleinen Kreis von Spezialisten zugänglich. Die vorliegende Edition bietet erstmals eine vollständige deutsche Übersetzung derjenigen sowjetischen Gesprächsprotokolle, Strategiepapiere und Hintergrunddiskussionen, |
|
|
|
|
|
|
|
|
|
|
die die Gorbatschow-Stiftung 2006 in Russland publiziert hat. Die intensive Kommentierung führt zugleich die vielfältigen westlichen und russischen Gegen- und Parallelversionen aus offiziellen Editionen und aus der umfangreichen Memoirenliteratur zusammen. In den Texten wird die Dramatik der Jahre 1989 und 1990 greifbar. Deutsche, sowjetische, europäische und globale Ereignisse stellten Moskau vor immer neue Herausforderungen - mit der Zustimmung zur Wiedervereinigung versuchte Gorbatschow auch, die komplexen, miteinander verzahnten innen- und außenpolitischen Probleme der UdSSR zu lösen. |
|
|
|
|
|
| |