5,605 research outputs found
Correlation of microseismic and chemical properties of brittle deformation in Locharbriggs sandstone
Full text linkThe time-dependent properties of ceramic materials such as rocks depend both on preexisting cracks and chemical properties acting at their tips. We have examined the direct effect of chemical processes on the growth of a crack population by carrying out triaxial flow-through compression tests on Locharbriggs sandstone. The tests were carried out at temperatures of 25–80°C and at strain rates ranging from 10−5 to 10−8 s−1 under constant stress rate loading. The exit pore fluid was analyzed after the tests for the concentration of dissolved ions and acoustic emission was monitored in real time throughout the tests. The exit pore fluid silica concentration and microcrack damage derived from the acoustic emission (AE) data both exhibited an exponential increase during the strain hardening phase of deformation. Damage parameters inferred from the AE data predict the stress-strain curves adequately, or at least up to the point of strong microcrack coalescence. The damage parameters and silica signal were strongly correlated by a power law relationship. The observed environment and strain rate dependence of mechanical properties can hence be attributed uniquely to time-dependent crack growth by the stress corrosion mechanism
An automatically generated high-resolution earthquake catalogue for the 2016-2017 Central Italy seismic sequence, including P and S phase arrival times
No full textCatalog of 440,697 earthquakes of the 2016-2017 Central Italy seismic sequence semi-automatically generated by Spallarossa et al. (2020). The catalogue covers one year of aftershocks following the first mainshock of the sequence (from 08242016 to 08312017).
The catalog has been generated using the Complete Automatic Seismic Processor (CASP) procedure (Scafidi et al., 2019) to detect the events and an advanced picker engine (RSNI-Picker2; Scafidi et al., 2018; Spallarossa et al., 2014) to determine their phase arrival times. The final set of about 7 million P- and 10 million S-wave arrival times have been used to locate the events using a non-linear location algorithm (NonLinLoc; Lomax et al. 2000), with a 1D velocity model calibrated for the area (De Luca et al., 2009) and station corrections. For each event, also local magnitudes (ML) has been calculated as well as a locations quality.
Earthquake locations quality has been classified by means of the procedure proposed by Michele et al., (2019) consisting of the combination of diverse uncertainty parameters provided by the NonLinLoc location code. Locations quality is provided in terms of a unique numeric normalized value, named quality factor, varying between qf=0 (best quality location) and qf=1 (worst quality location). Then locations have been assigned to a quality class depending on the qf parameter value according to the following scheme: A-class (0 < qf ≤ 0.25), B-class (0.25 < qf ≤ 0.50), C-class (0.50 < qf ≤ 0.75), and D-class (0.75 < qf < 1.00). The earthquake locations are distributed between the quality classes as A-30.6%, B-31.4%, C-18.6%, and D-19.4% (details in Spallarossa et al., 2020).
We accompanied the catalogue with the 30 events with M>3.5 missed by our procedure (bring the total number of events to 440,727), including the first Amatrice mainshock (MW6.0; see Spallarossa et al., 2020). These 30 missing events recognisable by the ID starting with ISI), have been taken from INGV bulletin (http://terremoti.ingv.it; ISIDe Working Group., 2007), manually generated. These additional events report INGV locations and magnitude parameters while are missing related quality factors and quality class, being generated by a different procedure.
We added to the larger events, the available moment magnitudes (MW) from Time Domain Moment Tensor catalogue (http://terremoti.ingv.it/tdmt; Scognamiglio et al., 2006).
The catalog is in csv format, semicolon separator, ordered by origin time and the header content is the following:
Id-event – ID
Latitude (°) expressed in decimal degrees - LAT
Longitude (°) expressed in decimal degrees - LON
Depth(km) hypocentral depth expressed in kilometres - DEP
Year of origin time in the format yyyy - YR
Month of origin time in the format mo - MON
Day of origin time in the format dd - DY
Hour of origin time in the format hh - HR
Minute of origin time in the format mi - MIN
Second of origin time in the format XX.XXX s - SEC
Local Magnitude - ML
Standard deviation of the Local Magnitude – STD
Moment Magnitude – Mw (from TDMT)
Horizontal Error (from NLL output) (km) expressed in kilometres - ERH
Vertical Error (from NLL output) (km) expressed in kilometres - ERZ
RMS (from NLL output) (s) expressed in seconds - RMS
Number of Phases – NPHS
Stations Azimuthal GAP (°) expressed in decimal degrees - GAP
Quality factor - Qf
Quality class - Qc
De Luca G., M. Cattaneo, G. Monachesi and A, Amato (2009). Seismicity in the Umbria-Marche region from the integration of national and regional seismic networks. Tectonophysics, 476(1), 219-231. doi: 10.1016/j.tecto.2008.11.032.
ISIDe Working Group. (2007). Italian Seismological Instrumental and Parametric Database (ISIDe). Istituto Nazionale di Geofisica e Vulcanologia (INGV); https://doi.org/10.13127/ISIDE.
Lomax, A., J. Virieux, P. Volant, and C. Berge-Thierry (2000). Probabilistic earthquake location in 3D and layered models: introduction of a Metropolis–Gibbs method and comparison with linear locations. In: Advances in seismic event location, ed. C. H. Thurber and N. Rabinowitz, 101–134. Dordrecht and Boston: Kluwer Academic Publishers.
Michele, M., Latorre, D., Emolo, A. (2019). An Empirical Formula to Classify the Quality of Earthquake Locations. Bulletin of the Seismological Society of America. Vol. 109, No. 6, pp. 2755–2761, December 2019, doi: 10.1785/0120190144.
Scafidi, D., Viganò A., Ferretti G., and Spallarossa D. (2018). Robust picking and accurate location with RSNI-Picker2: real-time automatic monitoring of earthquakes and non-tectonic events, Seismol. Res. Lett, Vol. 89 (4), pp. 1478-1487, doi: 10.1785/0220170206.
Scafidi D, Spallarossa D, Ferretti G, Barani S, Castello B, Margheriti L (2019). A complete automatic procedure to compile reliable seismic catalogs and travel-time and strong-motion parameters datasets. Seismol Res Lett 90(3):1308–1317.
Scognamiglio, L., Tinti, E., Quintiliani, M. (2006). Time Domain Moment Tensor [Data set]. Istituto Nazionale di Geofisica e Vulcanologia (INGV). https://doi.org/10.13127/TDMT.
Spallarossa, D., G. Ferretti, D. Scafidi, C. Turino, and M. Pasta (2014). Performance of the RSNI-Picker, Seismol. Res. Lett. 85, 1243–1254.
Spallarossa D., Cattaneo M., Scafidi D., Michele M., Chiaraluce L., Segou M. and I. G. Main (2020). An automatically generated high-resolution earthquake catalogue for the 2016-2017 Central Italy seismic sequence, including P and S phase arrival times. Geophys. J. Int. doi: 10.1093/gji/ggaa604
Fachkatalog Neuguinea / Stadt- und Universitätsbibliothek Frankfurt am Main
No full textAus Anlaß des Kongresses der "Deutsch-Pazifischen Gesellschaft" im Juni 1981 in Düsseldorf legt die Stadt- und Universitätsbibliothek Frankfuxt am Main ein Verzeichnis ihrer Bestände zum Raum "Neuguinea" vor . Dabei umfaßt der Katalog sowohl die Literatur zu "Papua-Neuguinea" (Niugini)" als auch zur indonesischen Provinz "West-Irian (Irian Jaya)". Aus Gründen des geographischen Zusammenhangs werden in einem Anhang allgemeine Publikationen zum Raum Melanesien in den Katalog aufgenommen. Die gezielte Sammlung der Literatur zu diesem Raum ist ein Ergebnis der Zuweisung des Sondersarnmelgebietes "Ozeanian" durch die Deutsche Forschungagemeinschaft an die Frankfurter Stadt- und Univeraitätsbibliothek. Dabei liegt der Schwerpunkt auf der Sammlung historischer und ethnologischer Literatur. Grundlage des Katalogausdruckes ist der Länderteil des Sachkataloges der Bibliothek, der nach feststehenden Länderkennziffern, Fachgruppen und Schlüsselnummern gegliedert ist. Unter jeder Schlüsselnummer sind die Eintragungen chronologisch geordnet. Auf jeder Titelkarte befindet sich rechts oben die Signatur, unter der das Buch über Fernleihe bei der Stadt- und Universitätsbibliothek Frankfurt am Main bestellt werden kann
The effect of intangible product attributes on rail passenger demand with special reference to ride quality
Full text linkThis study set out to investigate the value consumers
place on less tangible product attributes. Although some
work has been done in the p ast, to establish the relative
importance of intangible attributes; very few studies have
attempted to produce a financial value for a change. The
research was conducted in a rural railway environment and
so the product considered was a train journey. The main
intangible attribute chosen for the study was ride
quality.
Rural railway services make significant losses and as a
result have been threatened with closure. Reducing track
maintenance (and thus ride quality ) on these routes offers
considerable scope for cost reduction. But, very little
was known about the response of demand to changes in ride
quality. Any results obtained could, therefore, make a
contribution to maintaining railway services in areas of
limited public transport.
Although this study concentrated on the railway ride
problem, it is believed that the method developed during
this research would be applicable, with some modification,
to other topics
Dual VP Classes
No full textWe consider the complexity class ACC^1 and related families of arithmetic circuits. We prove a variety of collapse results, showing several settings in which no loss of computational power results if fan-in of gates is severely restricted, as well as presenting a natural class of arithmetic circuits in which no expressive power is lost by severely restricting the algebraic degree of the circuits. These results tend to support a conjecture regarding the computational power of the complexity class VP over finite algebras, and they also highlight the significance of a class of arithmetic circuits that is in some sense dual to VP.Presented at the 40th International Symposium on Mathematical Foundations of Computer Science (MFCS '15).Published as a chapter in: Mathematical foundations of computer science 2015 : 40th International Symposium, MFCS 2015, Milan, Italy, August 24-28, 2015, Proceedings. Part II, as part of the series
Lecture notes in computer science 9235, edited by G.F. Italiano, G. Pighizzini, & D. Sannella (Berlin: Springer, 2015). LNCS 9235 forms part of the LNCS sublibrary Theoretical computer science and general issues.The final publication is available at http://dx.doi.org/10.1007/978-3-662-48054-0Peer reviewed.The later journal article version of this paper is available from the publisher at http://dx.doi.org/10.1007/s00037-016-0146-7 and at http://dx.doi.org/doi:10.7282/T3ZC8531 (Accepted Manuscript version)
Reply to "Comment on 'Entropy, energy, and proximity to criticality in global earthquake populations"' by Chien-Chih Chen and Chun-Ling Chang
Full text linkSupplier selection using performance self assessment reporting in the automotive industry : executive summary
Full text linkThe automotive industry has adopted the use of third party quality
management certification as the main quality approval mechanism for its
supply base. In addition, most organisations have a system of supplier
monitoring to measure their existing supplier's performance and this approach
makes it difficult for suppliers to gain new business because their quality
capability is unknown to the customer.
Two case studies were conducted to determine whether or not suppliers
certified to one of the automotive quality management standards had
improved quality performance compared to those with the generic ISO 9001/2
standard. The research concluded that the additional certification
requirements and increased costs associated with the automotive standards
resulted in no quality benefit. Furthermore, a third case study using second
party quality assessment results demonstrated that there was no correlation
between these audit results and achieved quality performance.
Therefore the research set out to answer the question :
How can the current supplier selection practices used within the
automotive industry be improved to ensure effective decision-making?
The Supplier Performance Evaluation Datasheet (SPED) process was
developed from a synthesis of current practice and input from industry experts.
It incorporates adaptations of best practices in non-quality assessment
methods. Three key elements of the SPED process are:
- Performance reporting
- Minimum performance standards
- Stakeholder engagement
The proposed process was evaluated through two case studies at Cosworth
Technology Ltd and from an expert opinion survey of industry experts in the
field of supplier management.
The conclusion of this study was that the SPED process would enable
customers to select new suppliers with high levels of confidence. It would add
value to all organisations taking part and it is easy to implement.
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Cold war theology: a controversial religious image of King James VI & I in England and on the Continent in 1603
No full textA former student of James Cameron’s, Ian Hazlett contributes a paper very much in the spirit of his teacher. It considers the afterlife of the King’s (or Negative) Confession, commissioned by James VI of Scotland in 1581 as a clear statement of his Calvinist credentials. By the time he gained the crown of England in 1603 however, his evolving religious views meant it had become a document he sought to distance himself from. Both Protestant and Catholic propagandists and publishers, keen to give a particular picture of the theological sympathies of the new English king, subsequently produced a surprisingly varied selection of versions of the Confession. These sources and what they can tell us about the theology and politics of the day are considered here for the first time in a scholarly study.Publisher PD
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