984 research outputs found
Genotypic richness and dissimilarity opposingly affect ecosystem functioning
No full textP>Biodiversity is an essential determinant of ecosystem functioning. Numerous studies described positive effects of diversity on the functioning of communities arising from complementary resource use and facilitation. However, high biodiversity may also increase competitive interactions, fostering antagonism and negatively affecting community performance. Using experimental bacterial communities we differentiated diversity effects based on genotypic richness and dissimilarity. We show that these diversity characteristics have opposite effects on ecosystem functioning. Genotypic dissimilarity governed complementary resource use, improving ecosystem functioning in complex resource environments. Contrastingly, genotypic richness drove allelopathic interactions, mostly reducing ecosystem functioning. The net biodiversity effect on community performance resulted from the interplay between the genetic structure of the community and resource complexity. These results demonstrate that increasing richness, without concomitantly increasing dissimilarity, can decrease ecosystem functioning in simple environments due to antagonistic interactions, an effect insufficiently considered so far in mechanistic models of the biodiversity-ecosystem functioning relationship
Essai sur les hématocèles utérines intra-péritonéales, par le Dr M. Jousset,...
No full textContient une table des matièresAvec mode text
Histologie générale : étude critique sur Virchow et la pathologie cellulaire, par le Dr P. Jousset,...
No full textAvec mode text
Seismo-acoustic evidence for an avalanche driven phreatic eruption through a beheaded hydrothermal system: An example from the 2012 Tongariro eruption
No full textThe 6 August 2012 Te Maari eruption comprises a complex eruption sequence including multiple eruption pulses, a debris avalanche that propagated ~. 2. km from the vent, and the formation of a 500. m long, arcuate chasm, located ~. 300. m from the main eruption vent.The eruption included 6 distinct impulses that were coherent across a local infrasound network marking the eruption onset at 11:52:18 (all times UTC). An eruption energy release of ~3×1012J was calculated using a body wave equation for radiated seismic energy. A similar calculation based on the infrasound record, shows that ~90% of the acoustic energy was released from three impulses at onset times 11:52:20 (~20% of total eruption energy), 11:52:27 (~50%), and 11:52:31 (~20%). These energy impulses may coincide with eyewitness accounts describing an initial eastward directed blast, followed by a westward directed blast, and a final vertical blast.Pre-eruption seismic activity includes numerous small unlocatable micro-earthquakes that began at 11:46:50. Two larger high frequency earthquakes were recorded at 11:49:06 and 11:49:21 followed directly by a third earthquake at 11:50:17. The first event was located within the scarp based on an arrival time location from good first P arrival times and probably represents the onset of the debris avalanche. The third event was a tornillo, characterised by a 0.8. Hz single frequency resonance, and has a resonator attenuation factor of Q~. 40, consistent with a bubbly fluid filled resonator. This contrasts with a similar tornillo event occurring 2.5. weeks earlier having Q~. 250-1000, consistent with a dusty gas charged resonator. We surmise from pre-eruption seismicity, and the observed attenuation change, that the debris avalanche resulted from the influx of fluids into the hydrothermal system, causing destabilisation and failure. The beheaded hydrothermal system may have then caused depressurisation frothing of the remaining gas charged system leading to the onset of explosive activit
Examen des doctrines de M. Bouchard : professeur de pathologie générale à la Faculté de médecine de Paris / [signé : Dr P. Jousset]
No full textAvec mode text
D5.5: Report on task 5.4 describing methodologies, results, tests and calibrations
No full textFor Task 5.4 of GEISER ‘Shaking and damage scenarios from EGS induced and triggered events’ five journal articles have been submitted or published on various aspects of this topic. These five articles are:
1. ‘Modeling the difference in ground-motion magnitude-scaling in small and large earthquakes’ by J. Douglas and P. Jousset (2011), Seismological Research Letters, 82(4), 504–508, doi: 10.1785/gssrl.82.4.504.
2. ‘Predicting ground motion from induced earthquakes in geothermal areas’ by J. Douglas, B. Edwards, V. Convertito, N. Sharma, A. Tramelli, D. Kraaijpoel, B. M. Cabrera, N. Maercklin and C. Troise (2013), Bulletin of the Seismological Society of America, 103(3), 1875–1897, doi: 10.1785/0120120197.
3. ‘Magnitude scaling of induced earthquakes’ by B. Edwards and J. Douglas, Geothermics, revised and resubmitted March 2013.
4. ‘Selecting ground-motion models developed for induced seismicity in geothermal areas’ by B. Edwards and J. Douglas, Geophysical Journal International, submitted May 2013.
5. ‘Seismic network design to detect felt ground motions from induced seismicity’ by J. Douglas (2013), Soil Dynamics and Earthquake Engineering, 48, 193-197, doi:10.1016/j.soildyn.2013.01.030.
This project deliverable contains these five articles as annexes. The purpose of this short introduction is to summarize these articles and to link them together.FP
Réserve de propriété. La dation en paiement effectuée par le sous-acquéreur ne constitue pas un mode de paiement mettant obstacle à la revendication du prix de revente par le vendeur initial
No full textInternational audience(Com. 14 mai 2008, pourvoi n° 06-21.532, arrêt n°569 F-P+B, Jousset c/ Sté Elnagh Spa, RTD civ. 2008. 520, obs. P. Crocq ; D. 2008. AJ. 1477, obs. A. Lienhard, et Jur. 2253, note H. Aubry ; Gaz. proc. coll. 2008, n° 3, p. 62, obs. F. Pérochon
Thomas-François Potiquet, ancien maître de pension à Magny-en-Vexin : biographie / [signé B***]
No full textAvec mode text
Gravity “steps” at Mt. Etna volcano (Italy). Instrumental effects or evidences of earthquake-triggered magma density changes?
No full textOn two occasions, sudden gravity changes occurred simultaneously at two summit Etna’s stations, during local low-magnitude earthquakes. A systematic coupling between earthquakes inducing comparable maximum acceleration and displacement at the observation points and gravity steps is missing, implying (a) the non-instrumental nature of the steps and (b) the need for particular underlying conditions for the triggering mechanism(s) to activate.
We review some of the volcanological processes that could induce fast underground mass redistributions, resulting in gravity changes at the surface. These processes involve bubbles and crystals present in the magma and require particular conditions in order to be effective as mass-redistributing processes.
The gravity steps could be a geophysical evidence of the dynamical stress transfer between tectonic and magmatic systems at a local scale. Given the implications that these transfers may have on the volcanic activity, routine volcano monitoring should include the observation of fast gravity changes.In press3.6. Fisica del vulcanismoJCR Journalope
Measurement of the Reaction E+e--]eta-pi+pi- In the Center of Mass-energy Interval 1350-2400 Mev
No full text- …
