298 research outputs found
Delay interferometric single-shot measurement of a petawatt-class laser longitudinal chromatism corrector
International audienceIn this paper we present a self-referenced interferometric single-shot measurement technique that we use to evaluate the longitudinal chromatism compensation made by a diffractive lens corrector. A diffractive lens with a delay of 1 ps is qualified for a 60 mm beam aperture. This corrector was implemented on the Alisé Nd:glass power chain. We qualify the corrector and the Alisé power chain chromatism, demonstrating the potential of this measuring principle as well as the interest of diffractive lenses to correct longitudinal chromatism of petawatt-class lasers
Resurrecting the alien director: Jean-Pierre Jeunet in Hollywood
This essay examines the critical reception of Jean-Pierre Jeunet's Alien Resurrection in the popular Anglo-American press, where the film was often discussed in terms that highlighted the director's status as an 'outsider'. The anxiety that the film elicits among critics, it is argued, is a function of the very abjection that is depicted graphically within the film: a fear of the unclassifiable and of the crossing of boundaries
Decorated vertices with 3-edged cells in 2D foams: exact solutions and properties
The energy, area and excess energy of a decorated vertex in a 2D foam are
calculated. The general shape of the vertex and its decoration are described
analytically by a reference pattern mapped by a parametric Moebius
transformation. A single parameter of control allows to describe, in a common
framework, different types of decorations, by liquid triangles or 3-sided
bubbles, and other non-conventional cells. A solution is proposed to explain
the stability threshold in the flower problem.Comment: 13 pages, 17 figure
Data and initial model set-up for the 2022 VPA stock assessment of the eastern Atlantic and Mediterranean bluefin tuna
This document presents the data and initial model set-up for the 2022 Stock Assessment for the
Eastern Atlantic and Mediterranean bluefin tuna stock. During the 2017 Data Preparatory
meetings, several changes in the data used for previous assessments have been presented, among
which the revision of the Task 1 and Task 2 statistics and the selection of the indices of abundance.
This led to completely revisiting the catch at age matrix and the model specifications for the 2017
assessment. For the present document, the data over the historical period (1968-2015) were
nearly identical, whereas the data for the years 2016-2020 and abundance indices were updated.
As agreed in previous meetings, the initial model specifications were kept identical to the 2017
assessment as no change has been agreed on since then
Final data, explorations, model set-up and diagnostics for the 2022 VPA stock assessment of the eastern and Mediterranean Atlantic bluefin tuna stock
This document presents the modeling work done for the 2022 stock assessment for the Eastern and Mediterranean Bluefin tuna stock, during informal modeling subgroup meetings in June 2022. This document presents various runs built upon the base case for the 2017 stock assessment. These runs aim at addressing issues identified in the 2020 update assessment and aspects discussed during the
informal meetings held in june 2022, regarding the inclusion of updated catch at age data, improvement of model stability in relation to Fratio estimates, the selection of the age for the plus group, inclusion of the WMED_GBYP_AER index. Following several explorations, the present work contains two runs that displayed improved diagnostics compared to previous runs. These models have improved retrospective patterns and no problematic issue was found through jittering the random number generator, jittering the starting values for the terminal F estimate, bootstrapping
or through jackknife analysis
Review of the catch and catch-at-age estimation for the E-BFT catch inflated estimates 1998-2007
During the 2022 Eastern Atlantic and Mediterranean Bluefin Tuna Data Preparatory Meeting, the Bluefin Species Group (BFTSG) agreed to revise the assumptions and update the catch-atsize/catch-at-age (CAS/CAA) intersessionally by replacing the "NEI (inflated)" partial catches component (1998-2007) with a new set of combined Mediterranean size samples. An ad-hoc small group was formed to carry out this task and proposed an alternative CAS/CAA for the 2022 E-BFT stock assessment, this document summarizes these analyses. This document provides the revised CAS (version 2b), and two CAA based on the von Bertalanffy and the Richards growth
curves. The small group agreed that this revised CAS is a better estimate of the size distribution for the NEI-inflated catch and proposed to be adopted by the BFTSG, and aso recommended that this revision would be applied only to VPA (Virtual Population Analysis) and possibly ASAP (Age Structured Assessment Program)
Report of the 11th Liaison Meeting
The 11thLiaison Meeting between the Chairs of the RCMs, the ICES PGCCDBS,
PGMED and PGECON, the STECF EWGs on the DCF, the Regional Database Steering
Committees, the ICES and GFCM representatives and the European Commission was
held at the DG Maritime Affairs and Fisheries, Brussels from 8th to 9th October 2014. The 11th Liaison meeting was held in Brussels on 8th and 9th October 2014 to address the
following terms of reference:
TOR 1. Discussion on possible follow-‐‑up to the main outputs/recommendations of:
• The 2014 RCMs and to the sp ecific re commenda tions a ddr e sse d to th e Liaison
Meeting
• P G ECO N , PG CCDBS, PG Med – ou tcome s an d r e commendation s fr om the ir
2014 meeting
• STECF EWG and STEC F Plen ary -‐‑ ou tcome s a n d r e commendation s fr om the ir
2014 meeting
• Data end-‐‑ users (IC ES, G F C M, RC Ms)
TOR 2. Compilation of recommendations on the DCF
A compilation of DCF recommendations will be established by the COM by end 2014.
LM needs to agree on which recommendations should be included (i.e. from which
bodies) & covering which years.
TOR 3. Regional cooperation
• G r ants for str eng thene d reg ion al coop eration
• R e g ional da ta b ases
o O ver view of use of the Reg ional Datab ases for R CMs in 2014, and p rob lems
identified
o O ther deve lop ments (RDB training s in 2014, RDB Med&BS develop ment)
o Chang es for the fu tu re – an y re commen da tions from th e LM?
• R C M data calls – ove rview of h ow MS r esp onde d.
TOR 4. Recommended meetings/workshops
• P r ep a r e a list of r ecommen ded me etin g s for 2015 as g u idance for MS
TOR 5. Studies
• O ver view of p rocess
• LM comme nts and p r ioritization of studies p r op osed b y RC Ms, PG ECO N , ICES,
GFCM
TOR 6. AOB
1. The DCF website has been revamped by the JRC. Any comments on this?
2. Access to the RCM SharePoint
3. Derogations – List of derogations by Member State has been prepared by DG
MARE. Have any RCMs updated this?
4. ICES will provide an update on their plans to re-‐‑evaluate surveys. Should this
be followed by STECF work on surveys to be included in future EU MAP?
5. Annual reports – simplification: presentation of process. 6. Data transmission:
a. new platform for information exchanges between COM, MS and end-‐‑
users
b. new tool for reporting on how MS complied with the DG MARE/JRC
data calls
In addition to the above Terms of Reference, an item was added at the start of the
meeting, regarding the implication of the Landing Obligation on data collection and
the Discard Plans.
Non-Gaussian Velocity Distribution Function in a Vibrating Granular Bed
The simulation of granular particles in a quasi two-dimensional container
under the vertical vibration as an experimental accessible model for granular
gases is performed. The velocity distribution function obeys an
exponential-like function during the vibration and deviates from the
exponential function in free-cooling states. It is confirmed that this
exponential-like distribution function is produced by Coulomb's friction force.
A Langevin equation with Coulomb's friction is proposed to describe the motion
of such the system.Comment: 4 pages, 4 figures. to be published in Journal of Physical Society of
Japan Vol.73 No.
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