OpenMosix, OpenSSI and Kerrighed: A Comparative Study

This paper presents a comparative study of Kerrighed, openMosix and OpenSSI, three Single System Image (SSI) operating systems for clusters. This experimental study gives an overview of SSI features offered by these SSI and evaluates performance of such features

Optical Dark Rogue Wave

Photonics enables to develop simple lab experiments that mimic water rogue wave generation phenomena, as well as relativistic gravitational effects such as event horizons, gravitational lensing and Hawking radiation. The basis for analog gravity experiments is light propagation through an effective moving medium obtained via the nonlinear response of the material. So far, analogue gravity kinematics was reproduced in scalar optical wave propagation test models. Multimode and spatiotemporal nonlinear interactions exhibit a rich spectrum of excitations, which may substantially expand the range of rogue wave phenomena, and lead to novel space-time analogies, for example with multi-particle interactions. By injecting two colliding and modulated pumps with orthogonal states of polarization in a randomly birefringent telecommunication optical fiber, we provide the first experimental demonstration of an optical dark rogue wave. We also introduce the concept of multi-component analog gravity, whereby localized spatiotemporal horizons are associated with the dark rogue wave solution of the two-component nonlinear Schrödinger system

A SIMPLE METHOD TO MEASURE EXTERNAL FORCE, POWER OUTPUT AND EFFECTIVENESS OF FORCE APPLICATION DURING SPRINT ACCELERATION

The aim of this applied session was to introduce and show a recently validated simple field method to determine individual force, velocity, power output properties and effectiveness of force application onto the ground during a sprint running acceleration. This method requires the use of a radar device (or several timing gates), and models the horizontal, vertical and resultant force an athlete develops over sprint acceleration using a macroscopic inverse dynamic approach. Low differences in comparison to force plate data support the validity of this simple method to determine force-velocity relationship and maximal power output, as well as the index of effectiveness of force application onto the ground. Its validity and ease of use make it an interesting tool for sprint training and performance optimization, in a specific field context of practice

Organic livestock farming systems in the Massif Central: evolution (2008-2011) and analysis of the technical and economic performances and drivers

The “Organic Farming Massif Central” hub and fifteen partners lead a program on sustainability and on the technical and economic operation of OF livestock systems in the Massif Central. This systemic and multi-year study (2008-2011) is based on data from a constant sample over four years, from 56 farms comprising four types of products: cattle and sheep, dairy and meat. Over 4 years, the technical and economic results are quite stable, and at a good level, but with great variability inter-farms. With lower labor productivity, but with a more diversified crop rotation, a good food self-sufficiency and good technical skills, the farms with the highest income get an income more than four times higher than the farms with the lowest income

Effect of the Fatigue Induced by a 110-km Ultramarathon on Tibial Impact Acceleration and Lower Leg Kinematics

Ultramarathon runners are exposed to a high number of impact shocks and to severe neuromuscular fatigue. Runners may manage mechanical stress and muscle fatigue by changing their running kinematics. Our purposes were to study (i) the effects of a 110-km mountain ultramarathon (MUM) on tibial shock acceleration and lower limb kinematics, and (ii) whether kinematic changes are modulated according to the severity of neuromuscular fatigue. Twenty-three runners participated in the study. Pre- and post-MUM, neuromuscular tests were performed to assess knee extensor (KE) and plantar flexor (PF) central and peripheral fatigue, and a treadmill running bouts was completed during which step frequency, peak acceleration, median frequency and impact frequency content were measured from tibial acceleration, as well as foot-to-treadmill, tibia-to-treadmill, and ankle flexion angles at initial contact, and ankle range of motion using video analysis. Large neuromuscular fatigue, including peripheral changes and deficits in voluntary activation, was observed in KE and PF. MVC decrements of ~35% for KE and of ~28% for PF were noted. Among biomechanical variables, step frequency increased by ~2.7% and the ankle range of motion decreased by ~4.1% post-MUM. Runners adopting a non rearfoot strike pre-MUM adopted a less plantarflexed foot strike pattern post-MUM while those adopting a rearfoot strike pre-MUM tended to adopt a less dorsiflexed foot strike pattern post-MUM. Positive correlations were observed between percent changes in peripheral PF fatigue and the ankle range of motion. Peripheral PF fatigue was also significantly correlated to both percent changes in step frequency and the ankle angle at contact. This study suggests that in a fatigued state, ultratrail runners use compensatory/protective adjustments leading to a flatter foot landing and this is done in a fatigue dose-dependent manner. This strategy may aim at minimizing the overall load applied to the musculoskeletal system, including impact shock and muscle stretch

SPRINT ACCELERATION MECHANICS

Sprint acceleration is a key feature in many sports performance. It is a direct determinant of performance and the focus of specific training in track and field events such as the 100- or 200-m, but is also paramount in other sports such as soccer or rugby. In the latter, the acceleration capability is a major physical determinant of performance, especially in decisive offensive and defensive actions. In addition, although the exact moment of occurrence is still debated, sprinting and the acceleration phase in particular are the most frequent tasks involved in hamstring strain injuries. Therefore, a better understanding of the mechanical determinants of sprint acceleration performance could help sport practitioners better design training programs, and likely better manage the complex muscle injury prevention / rehabilitation process. However, due to the very fast motion of the human body induced by maximal acceleration (running speeds of more than 10 m.s-1 are reached within a few seconds), and the necessary field (i.e. specific) measurements, valid scientific methods that provide direct, accurate and specific mechanical data over the course of an entire sprint (start + acceleration phases) are scarce

Benoit Bouchard, Bernard “Bing” Bouchard, Albert “Bert” Morin, Walter Nadeau, and Beatrice Morin, interviewed by Amy Bouchard Morin, Part 4

Benoit Bouchard, Bernard “Bing” Bouchard, Albert “Bert” Morin, Walter Nadeau, and Beatrice Morin, interviewed by Amy Bouchard Morin, February 18, 1994, at Albert and Amy Morin\u27s home in Old Town, Maine, for the Islands and Bridges project. The group reminisces about life on French Island: family relationships; where specific families lived; stores; carpenter work; Great Depression; prices; homebrew, bootlegging, and Prohibition; nicknames; music and dances; cutting and storing ice from the river; coal and grain from the railroad; cellar flooding; property ownership and land use on the island; drainage and sewers; food packaging, barrels and boxes of pickles, crackers, molasses, etc.; buying gasoline; driving in the 1920s; stretching candy; smoking; buying houses in the 1940s and 1950s; fishing; delivering mail; nosy neighbors; funerals; helpful neighbors; college students. Listen Part 1. mfc_na2761_c1485_01 Part 2. mfc_na2761_c1485_02 Part 3. mfc_na2761_c1486_01 Part 4. mfc_na2761_c1486_02https://digitalcommons.library.umaine.edu/mf026/1010/thumbnail.jp

Benoit Bouchard, Bernard “Bing” Bouchard, Albert “Bert” Morin, Walter Nadeau, and Beatrice Morin, interviewed by Amy Bouchard Morin, Part 2

Benoit Bouchard, Bernard “Bing” Bouchard, Albert “Bert” Morin, Walter Nadeau, and Beatrice Morin, interviewed by Amy Bouchard Morin, February 18, 1994, at Albert and Amy Morin\u27s home in Old Town, Maine, for the Islands and Bridges project. The group reminisces about life on French Island: family relationships; where specific families lived; stores; carpenter work; Great Depression; prices; homebrew, bootlegging, and Prohibition; nicknames; music and dances; cutting and storing ice from the river; coal and grain from the railroad; cellar flooding; property ownership and land use on the island; drainage and sewers; food packaging, barrels and boxes of pickles, crackers, molasses, etc.; buying gasoline; driving in the 1920s; stretching candy; smoking; buying houses in the 1940s and 1950s; fishing; delivering mail; nosy neighbors; funerals; helpful neighbors; college students. Listen Part 1. mfc_na2761_c1485_01 Part 2. mfc_na2761_c1485_02 Part 3. mfc_na2761_c1486_01 Part 4. mfc_na2761_c1486_02https://digitalcommons.library.umaine.edu/mf026/1008/thumbnail.jp

Benoit Bouchard, Bernard “Bing” Bouchard, Albert “Bert” Morin, Walter Nadeau, and Beatrice Morin, interviewed by Amy Bouchard Morin, Part 3

Benoit Bouchard, Bernard “Bing” Bouchard, Albert “Bert” Morin, Walter Nadeau, and Beatrice Morin, interviewed by Amy Bouchard Morin, February 18, 1994, at Albert and Amy Morin\u27s home in Old Town, Maine, for the Islands and Bridges project. The group reminisces about life on French Island: family relationships; where specific families lived; stores; carpenter work; Great Depression; prices; homebrew, bootlegging, and Prohibition; nicknames; music and dances; cutting and storing ice from the river; coal and grain from the railroad; cellar flooding; property ownership and land use on the island; drainage and sewers; food packaging, barrels and boxes of pickles, crackers, molasses, etc.; buying gasoline; driving in the 1920s; stretching candy; smoking; buying houses in the 1940s and 1950s; fishing; delivering mail; nosy neighbors; funerals; helpful neighbors; college students. Listen Part 1. mfc_na2761_c1485_01 Part 2. mfc_na2761_c1485_02 Part 3. mfc_na2761_c1486_01 Part 4. mfc_na2761_c1486_02https://digitalcommons.library.umaine.edu/mf026/1009/thumbnail.jp

Benoit Bouchard, Bernard “Bing” Bouchard, Albert “Bert” Morin, Walter Nadeau, and Beatrice Morin, interviewed by Amy Bouchard Morin, Part 1

Benoit Bouchard, Bernard “Bing” Bouchard, Albert “Bert” Morin, Walter Nadeau, and Beatrice Morin, interviewed by Amy Bouchard Morin, February 18, 1994, at Albert and Amy Morin\u27s home in Old Town, Maine, for the Islands and Bridges project. The group reminisces about life on French Island: family relationships; where specific families lived; stores; carpenter work; Great Depression; prices; homebrew, bootlegging, and Prohibition; nicknames; music and dances; cutting and storing ice from the river; coal and grain from the railroad; cellar flooding; property ownership and land use on the island; drainage and sewers; food packaging, barrels and boxes of pickles, crackers, molasses, etc.; buying gasoline; driving in the 1920s; stretching candy; smoking; buying houses in the 1940s and 1950s; fishing; delivering mail; nosy neighbors; funerals; helpful neighbors; college students. Listen Part 1. mfc_na2761_c1485_01 Part 2. mfc_na2761_c1485_02 Part 3. mfc_na2761_c1486_01 Part 4. mfc_na2761_c1486_02https://digitalcommons.library.umaine.edu/mf026/1007/thumbnail.jp