1,680 research outputs found
Low Frequency Tilt Seismology with a Precision Ground Rotation Sensor
We describe measurements of the rotational component of teleseismic surface
waves using an inertial high-precision ground-rotation-sensor installed at the
LIGO Hanford Observatory (LHO). The sensor has a noise floor of 0.4 nrad at 50 mHz and a translational coupling of less than 1 rad/m
enabling translation-free measurement of small rotations. We present
observations of the rotational motion from Rayleigh waves of six teleseismic
events from varied locations and with magnitudes ranging from M6.7 to M7.9.
These events were used to estimate phase dispersion curves which shows
agreement with a similar analysis done with an array of three STS-2
seismometers also located at LHO
Facteurs de risque organisationnels et psychosociaux de syndrome du canal carpien dans la population salariée des Pays de la Loire
Response to ''Comment on 'Enhanced Jc's of YBa2Cu3O7 - x-Ag ex situ annealed coevaporated films on LaAlO3 (100) substrates''' (Appl. Phys. Lett. 67, 3650 (1995))
Statistical features of edge turbulence in RFX-mod from Gas Puffing Imaging
Plasma density fluctuations in the edge plasma of the RFX-mod device are
measured through the Gas Puffing Imaging Diagnostics. Statistical features of
the signal are quantified in terms of the Probability Distribution Function
(PDF), and computed for several kinds of discharges. The PDFs from discharges
without particular control methods are found to be adequately described by a
Gamma function, consistently with the recent results by Graves et al [J.P.
Graves, et al, Plasma Phys. Control. Fusion 47, L1 (2005)]. On the other hand,
pulses with external methods for plasma control feature modified PDFs. A first
empirical analysis suggests that they may be interpolated through a linear
combination of simple functions. An inspection of the literature shows that
this kind of PDFs is common to other devices as well, and has been suggested to
be due to the simultaneous presence of different mechanisms driving
respectively coherent bursts and gaussian background turbulence. An attempt is
made to relate differences in the PDFs to plasma conditions such as the local
shift of the plasma column. A simple phenomenological model to interpret the
nature of the PDF and assign a meaning to its parameters is also developed.Comment: 27 pages. Published in PPC
CoForTips Congo basin forests: tipping points for biodiversity conservation and resilience. Final Report (La modélisation des changements d’utilisation des terres dans les pays d’Afrique Centrale 2000-2030)
L'utilisation des terres est un facteur crucial pour le développement économique et l'environnement. Ainsi une terre dédiée à l’agriculture permettra une production régulière qui sera bénéfique pour satisfaire les besoins alimentaires des populations alentour et potentiellement, pour l’économie dans son ensemble. Par contre, les terres agricoles ont un contenu carbone bien inférieur à une terre forestière et sont généralement pauvres en biodiversité. Les terres peuvent être utilisées de différentes manières afin de répondre à différents objectifs et il peut être potentiellement difficile de satisfaire tous ces objectifs à la fois, donnant lieu à des choix difficiles lors de la conception des politiques.
Les pays membres de la Commission des forêts d'Afrique centrale (COMIFAC) ont identifié l’initiative pour la réduction des émissions issues de la déforestation et de la dégradation forestière et l'amélioration des stocks de carbone (REDD+) comme un enjeu majeur dans la dernière revision du Plan de Convergence pour la Gestion Durable des Forêts, aux côtés de la conservation et de l’utilisation durable de la diversité biologique et de la réduction des impacts du changement climatique. Cette étude a pour objectif d’identifier les zones soumises aux pressions de conversion les plus fortes dans le futur et les conséquences en termes de production agricole, d’émissions de gaz à effet de serre (GES) et de risque de perte de biodiversité, avec pour but d’accompagner les institutions impliquées dans la REDD+ ainsi que dans la planification des Stratégies Nationales et Plans d’Action pour la Biodiversité dans les pays de la COMIFAC
Modelling future land use changes in Central Africa 2000-2030. A report by the REDD-PAC project
Are people who participate in cultural activities more satisfied with life?
The influence of various aspects of life on wellbeing has been extensively researched. However, despite little empirical evidence, participation in leisure activities has been assumed to increase subjective wellbeing. Leisure is important because it is more under personal control than other sources of life satisfaction. This study asked whether people who participate in cultural leisure activities have higher life satisfaction than people who do not, if different types of leisure have the same influence on life satisfaction and if satisfaction is dependent on the frequency of participation or the number of activities undertaken. It used data from UKHLS Survey to establish associations between type, number and frequency of participation in leisure activities and life satisfaction. Results showed an independent and positive association of participation in sport, heritage and active-creative leisure activities and life satisfaction but not for participation in popular entertainment, theatre hobbies and museum/galleries. The association of reading hobbies and sedentary-creative activities and life satisfaction was negative. High life satisfaction was associated with engaging in a number of different activities rather than the frequency of participation in each of them. The results have implications for policy makers and leisure services providers, in particular those associated with heritage recreation. Subjective wellbeing measures, such as life satisfaction, and not economic measures alone should be considered in the evaluation of services. The promotion of leisure activities which are active and promote social interaction should be considered in programmes aimed at improving the quality of life
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