DIFFUSION QUASI ÉLASTIQUE

Dans une première partie, on rappelle les conditions cinématiques dans lesquelles sont étudiées les réactions de diffusion quasi élastique ainsi que l'approximation de l'impulsion qui est utilisée pour leur interprétation. On analyse ensuite dans quel sens ces expériences ont évolué dans les dernières années' Trois expériences récentes sont présentées et discutées. Deux concernent les sous-structures α étudiées par réaction (p, pα) à 157 MeV et 600 MeV. La dernière s'intéresse aux agrégats d, t et 3He obtenus par réaction (p, pϰ) à 75 MeV

Aggregating multiple classification results using fuzzy integration and stochastic feature selection

AbstractClassifying magnetic resonance spectra is often difficult due to the curse of dimensionality; scenarios in which a high-dimensional feature space is coupled with a small sample size. We present an aggregation strategy that combines predicted disease states from multiple classifiers using several fuzzy integration variants. Rather than using all input features for each classifier, these multiple classifiers are presented with different, randomly selected, subsets of the spectral features. Results from a set of detailed experiments using this strategy are carefully compared against classification performance benchmarks. We empirically demonstrate that the aggregated predictions are consistently superior to the corresponding prediction from the best individual classifier

Postmortem Evaluation of Left Flank Laparoscopic Access in an Adult Female Giraffe (Giraffa camelopardalis)

There are still few reports of laparoscopy in megavertebrates. The giraffe (Giraffa camelopardalis) is the tallest land mammal, and the largest ruminant species. An 18-year-old multiparous female hybrid giraffe, weighing 650 kg, was euthanized for chronic health problems, and left flank laparoscopy was performed less than 30 minutes after death. Safe primary access was achieved under visualisation using an optical bladed trocar (Visiport Plus, Tyco healthcare UK Ltd) without prior abdominal insufflation. A left paralumbar fossa approach allowed access to the spleen, rumen, left kidney, and intestines, but did not allow access to the reproductive tract which in nongravid females is intrapelvic in nature

Challenges and Benefits in Using Productivity Data from Clinical Trials for VBP Decisions

Making value based purchasing decisions in healthcare requires balancing data from several sources. Information on effectiveness of interventions often comes from clinical trials, with less reliance on observational studies. Historically, the opposite has been true of information on the cost of interventions. More recently, providers of healthcare interventions such as drugs, devices, and disease management programs have begun to understand and appreciate the importance of costs in healthcare decision making. Because of this, the clinical trials used to demonstrate effectiveness have begun to gather data on costs. This article describes some benefits and detriments of collecting cost data as a component of clinical trials, focusing specifically on the data related to productivity

The costs of breed reconstruction from cryopreserved material in mammalian livestock species

The aim of this work was to compare costs, in the horse, cattle, sheep, swine, and rabbit species, for the creation of gene banks for reconstruction of an extinct breed, using different strategies: embryos-only, embryos in combination with semen, and semen-only. Three cost measures were used: time required for population reconstruction, cost for creation of the gene bank, number of years-keeping-female to reach reconstruction. Semen costs were estimated across four scenarios: the presence or absence of a commercial market for semen, purchase of semen donors, and semen extracted from the epididymus. The number of cells were doubled to take into account the creation of two storage sites. The strategy embryos-only required the shortest time to reach reconstruction. With the strategy embryos + semen, time increased with decreasing proportions of embryos. With semen-only, reconstruction time varied from 2 to 21 years. A high variation of costs was observed across species and strategies, from 360 Euros in the rabbit to 1 092 300 in the horse. In all species, the embryos-only strategy was about 10% more expensive than using 90% embryos + semen. Decreasing the percentage of embryos further diminished costs. The number of years-keeping-female ranged across strategies, from 2 in the rabbit, to a maximum of 12 878 in the horse

An Examination of the Relationship Between Stock Index Cash and Futures Markets: A Cointegration Approach

The existence of price discovery, market efficiency and market stability associated with spot and futures markets continues as a prominent discussion among academics, practitioners and regulators. Numerous papers examine the role of price discovery in the futures markets for various types of commodities and financial assets. Generally, the studies by Garbade and Silber (1983), Herbst, McCormack and West (1987), Kawaller, Koch and Koch (1987) and Schroeder and Goodwin (1991) indicate that price discovery occurs more significantly in the futures market compared to the cash market

Reaction ⁶Li(p, Δ⁺⁺)⁶He At 1.04 GeV And The Δ−N Interaction

The reaction ⁶Li(p, Δ⁺⁺)⁶He has been studied at 1.04 GeV for transferred momenta ranging from 0.11 to 0.35 (GeV/c)2. An exponential decrease of the cross section is observed. A Glauber-type calculation is presented. The possibility of extracting information on σ(ΔN) and α(ΔN) is discussed

Edge and face linear vibration welding of wood panels

Edge-to-edge linear vibration welding of particle- board, OSB, MDF and plywood gives better strength than face-to-face panel welding. In general, the edge-to-edge weldline is slightly weaker than the panels itself. The face- to-face weldline is stronger than the strength of the material in the same direction