323,102 research outputs found
Influence of Displacement Rate on Residual Shear Strength of Clays
No full textThis paper reports on the results of direct shear tests carried out under controlled displacement rate in the range of 10-4 -
102 mm/min, under different normal stresses, with different shear devices. The tests were carried out on a kaolin, a bentonite,
their mixtures with sand at various percentages, and the clayey soil of the Costa della Gaveta earthflow. The tests were
performed on specimens reconstituted with distilled water as well as with NaCl solutions at various concentrations. Positive rate
effects were exhibited by mixtures with c.f. higher than 50% and, consistently, by the natural clayey soil the c.f. of which is about
50%. The residual shear strength increases significantly for shear displacement rate higher than about 1 mm/min. The rate effect
increases with the pore solution concentration. The residual shear strength independence of displacement rate has been confirmed
in the range 10-6 - 10-1 mm/min by the results of shear tests performed under controlled shear stress, with varying chemical
conditions of the pore fluid
The rms-flux relation in accreting white dwarfs: another nova-like variable and the first dwarf nova
No full textWe report on the detection of the linear rms-flux relation in two
accreting white dwarf binary systems: V1504 Cyg and KIC 8751494. The
rms-flux relation relates the absolute root-mean-square (rms)
variability of the light curve to its mean flux. The light curves
analysed were obtained with the Kepler satellite at a 58.8 s cadence.
The rms-flux relation was previously detected in only one other
cataclysmic variable (CV), MV Lyr. This result reinforces the ubiquity
of the linear rms-flux relation as a characteristic property of
accretion-induced variability, since it has been observed in several
black hole binaries, neutron star binaries and active galactic nuclei.
Moreover, its detection in V1504 Cyg is the first time the rms-flux
relation has been detected in a dwarf nova-type CV during quiescence.
This result, together with previous studies, hence points towards a
common physical origin of accretion-induced variability, independent of
the size, mass or type of the central accreting compact object
Transition metal-catalyzed alkene isomerization as an enabling technology in tandem, sequential and domino processes
No full textOne-pot reactions elaborated around transition metal-catalyzed isomerization of alkenes not only offer the inherent advantages of atom-, step-and redox-economy but also enable the preparation of value-Added products that would be difficult to access by conventional methods. In this Review, we cover seminal and recent examples of tandem, sequential and domino processes, which incorporate the most attractive features of olefin isomerization
Temozolomide-related hematologic toxicity.
No full textTemozolomide (TMZ) is an oral alkylating agent used for the treatment of recurrent or newly diagnosed malignant gliomas with significant survival benefit. TMZ is generally well tolerated and safe. The most common side effects are mild to moderate, and are represented by fatigue, nausea, vomiting, thrombocytopenia, and neutropenia. However severe hematologic adverse events (HAEs), including myelodysplastic syndrome and aplastic anemia, have also been reported. In this review we present an overview of the available literature of HAEs after exposure to TMZ. © 2013 S. Karger GmbH, Freiburg
On the Raman O VI and related lines in classical novae
No full textWe critically examine the recent claimed detection of Raman-scattered O VI at around 6830 Å in the iron curtain stage spectra of the classical CO nova V339 Del. The observed line variations are compatible in the profile and timing of emission line strength with an excited state transition of neutral carbon. Line formation in classical nova ejecta is physically very different from what it is in symbiotic binaries, in which the O VI emission line is formed within the wind of the companion red giant at low differential velocity. The ejecta velocity and density structure prevent the scattering from producing analogous features. High velocity gradient outflows, such as winds, are subject to the same constraints. There might, however, be a broadband spectropolarimetric signature of the Raman process and also Rayleigh scattering at some stage in the expansion. We show that the neutral carbon spectrum, hitherto underexploited for novae, is especially useful as a probe of the structure of the ejecta during the early, optically thick stages of the expansion.sponsorship: Based on observations made with the Mercator Telescope, operated on the island of La Palma by the Flemish Community, at the Spanish Observatorio del Roque de los Muchachos of the Instituto de Astrofsica de Canarias. Further based on observations obtained with the HERMES spectrograph, which is supported by the Fund for Scientific Research of Flanders (FWO), Belgium, the Research Council of K.U.Leuven, Belgium, the Fonds National de la Recherche Scientifique (F.R.S.-FNRS), Belgium, the Royal Observatory of Belgium, the Observatoire de Geneve, Switzerland, and the Thuringer Landessternwarte Tautenburg, Germany. S.N.S. warmly thanks Elena Mason, Greg Schwarz, Sumner Starrfield, Francois Teyssier, and Patrick Woudt for invaluable discussions and exchanges. S. S. acknowledges funding from the FWO Pegasus Marie Curie fellowship program. We thank Alejandra Sans Fuentes, Roy Stensen, and Maria Suveges for carrying out some of the observations. We thank the referee, Bob Williams, for very helpful suggestions. (Fund for Scientific Research of Flanders (FWO), Belgium, Research Council of K.U.Leuven, Belgium, Fonds National de la Recherche Scientifique (F.R.S.-FNRS), Belgium, Royal Observatory of Belgium, Observatoire de Geneve, Switzerland, Thuringer Landessternwarte Tautenburg, Germany, FWO Pegasus Marie Curie fellowship program)status: Publishe
Effect of ipsilateral and contralateral low-frequency narrow-band noise on temporary threshold shift in humans
No full textObjective - To evaluate the effect of ipsilateral and contralateral low-frequency (250 Hz) narrow-band noise (NBN) on the temporary threshold shift (TTS) induced by a 2 kHz tone in young normally hearing subjects with a functioning auditory efferent system. Material and Methods - Sixteen young volunteers served as subjects. All the subjects were young (20-30 years), disease-free and had a medical history negative for otological disease, noise exposure and use of ototoxic drugs. They had normal hearing [thresholds of 125-8000 Hz below 20 dB hearing level (HL)], transient-evoked otoacoustic emissions and contralateral suppression. The subjects were randomly assigned to one of three different groups. Subjects in Group A (n = 5) were exposed to a 90 dB HL 2 kHz pure tone for 10 min. Subjects in Group B (n = 6) were exposed to a 90 dB HL 2 kHz pure tone and an ipsilateral 45 dB HL 250 Hz NBN for 10 min. Subjects in Group C (n = 5) were exposed to a 90 dB HL 2 kHz pure tone and a contralateral 45 dB HL 250 Hz NBN for 10 min. The right ear served as the test ear. The TTS 2 min after the end of the exposure (TTS2) was measured in all subjects at 2, 3 and 4 kHz. Results - TTS2 in Group A was significantly higher at 3 kHz (p = 0.011) and at 4 kHz (p = 0.003) than TTS2 in Group B. At 4 kHz, TTS2 in Group C was significantly higher (p = 0.013) than TTS2 in Group B. Although TTS2 in Group C was lower than TTS2 in Group A, this difference was not significant. The presence of an ipsilateral low-frequency NBN significantly reduced TTS2 induced by a 90 dB HL 2 kHz tone. A contralateral low-frequency NBN reduced TTS2 in this group of subjects; however, the reduction was not significant. Conclusion - The results of this study show that an ipsilateral low-intensity, low-frequency (250 Hz) NBN can give protection from a TTS induced by a 2 kHz tone. Contralateral low-frequency NBN did not induce any protective effect
Data for 3D reconstruction and point cloud classification using machine learning in cultural heritage environment
No full textUnmanned Aerial Vehicle (UAV) photogrammetry, thanks to the development of Structure from Motion (SfM) and Multi-View Stereo (MVS) algorithms, allows the generation of dense point clouds, capable of representing three-dimensional objects and structures in a detailed and accurate manner. In addition, the possibility of associating more semantic information through automatic segmentation and classification models, becomes of fundamental importance in the field of development, protection and maintenance of Cultural Heritage (CH). With the developments in Artificial Intelligence (AI), classification algorithms based on Machine Learning (ML) have been developed. In particular, the Random Forest is used in order to perform a semantic classification of the point cloud generated by UAV photogrammetry and Global Navigation Satellite Systems (GNSS) survey of a structure belonging to CH environment. Indeed, this paper describes the images collected through a UAV survey, for 3D reconstruction of Temple of Hera (Italy) based on photogrammetric approach and georeferenced by the use of 8 Ground Control Points (GCPs) acquired by GNSS survey. In addition, the shared dataset contains the point cloud and data for classification using Random Forest algorithm
Effects of efferent acoustic reflex activation on psychoacoustical tuning curves in humans
No full textClay creep and displacements: influence of pore fluid composition
No full textTime dependent shear displacements in clay soils under constant effective stresses can also be induced by changes in pore fluid composition. This paper presents the results of laboratory tests carried out on a sodium bentonite and on samples of the Varicoloured Clays formation outcropping east of Potenza, Southern Italian Apennines. The soils reconstituted with a 1M NaCl solution were submitted to shear tests under constant shear stresses in two different conditions: i) after shearing to the residual state, and ii) intact at various OCR. The applied shear stresses were lower than the residual strength of the materials reconstituted with the salt solution (residual friction angle, ’r ≈ 15°) and higher than that obtained with distilled water (’r ≈ 5°). While exposed to 1M NaCl solution, the specimens didn’t experiment creep; on the contrary, exposure to distilled water made the displacement rate increase greatly. The decrease in pore ion concentration obliterated the over-consolidation effects
Diffusive author(s), cohesive author: Analysis of S/N (1994)
No full textThis study indicates the ways in which various aspects of the author(s) are brought forth in Dumb type’s performance art, the S/N production. Previous research has suggested a non-hierarchical organization of Dumb type and the absence of a “privileged author” in Dumb type’s collaborative work, S/N. However, the results that I have investigated from member’s interviews on the creative process of S/N along with my analysis of the recorded images of S/N, indicate a different aspect of the author(s). First, S/N was created through, so to speak, the collective ideas of the members of Dumb type. Further, S/N has at least nine quotations from previous performances, installations, and printed writings, besides the work-in-progress technique. Explicating one of the “author functions” as given by Michel Foucault, each text has plural subjects of the author. However, it has been revealed from members’ interviews that Teiji Furuhashi had a decision-making role in selecting the members’ ideas within the performance. Since then, S/N has had plural subjects of creation; however, Furuhashi is one of the subjects of creation along with the “privileged author.” S/N has plural authors (diffusive authors) yet at the same time, it has a “privileged author,” Teiji Furuhashi (cohesive author)
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