Large expert-curated database for benchmarking document similarity detection in biomedical literature search

Document recommendation systems for locating relevant literature have mostly relied on methods developed a decade ago. This is largely due to the lack of a large offline gold-standard benchmark of relevant documents that cover a variety of research fields such that newly developed literature search techniques can be compared, improved and translated into practice. To overcome this bottleneck, we have established the RElevant LIterature SearcH consortium consisting of more than 1500 scientists from 84 countries, who have collectively annotated the relevance of over 180 000 PubMed-listed articles with regard to their respective seed (input) article/s. The majority of annotations were contributed by highly experienced, original authors of the seed articles. The collected data cover 76% of all unique PubMed Medical Subject Headings descriptors. No systematic biases were observed across different experience levels, research fields or time spent on annotations. More importantly, annotations of the same document pairs contributed by different scientists were highly concordant. We further show that the three representative baseline methods used to generate recommended articles for evaluation (Okapi Best Matching 25, Term Frequency-Inverse Document Frequency and PubMed Related Articles) had similar overall performances. Additionally, we found that these methods each tend to produce distinct collections of recommended articles, suggesting that a hybrid method may be required to completely capture all relevant articles. The established database server located at https://relishdb.ict.griffith.edu.au is freely available for the downloading of annotation data and the blind testing of new methods. We expect that this benchmark will be useful for stimulating the development of new powerful techniques for title and title/abstract-based search engines for relevant articles in biomedical research.Peer reviewe

ONDES DE LAMB DANS LES MILIEUX MULTICOUCHES

L'interaction d'une onde ultrasonore avec un système bi-couche constitué d'une plaque d'acier doux anisotrope et d'une couche de colle est étudié expérimentalement et théoriquement. Les propriétés d'anisotropie de la plaque métallique sont démontrés à partir des courbes de dispersion des vitesses des modes de Lamb d'ordre zéro. L'amplitude des modes A0 et S0 est mesurée par analyse spectrale des signaux réfléchis. Les variations d'amplitude de ces signaux en fonction du produit Fd (où F est la fréquence ultrasonore et d l'épaisseur de la plaque) sont analysées théoriquement et interprétés physiquement. Les résultats sont ensuite étendus au cas d'un système bi-couche constitué par une couche de colle déposée sur la plaque. L'influence de la couche de colle, non visible sur les courbes de dispersion, est mise en évidence sur l'amplitude des coefficients de réflexion.The interaction of an ultrasonic wave with a double-layer system made of an anisotropic steel plate and an adhesive medium is experimentally and theoretically studied. The anisotropic properties of the rolled plate are demonstrated by using velocity dispersion curves. The amplitude of the modes A0 and S0 are measured by spectrum analysis of the reflected signals. Their variation with respect to the product Fd (where F is the ultrasonic frequency and d the plate thickness) are analyzed theoretically and physically interpreted. These results are then extended to the case of the double layer system. For a plate with adhesive layer it is shown that significant changes of the amplitude of the reflection coefficient occur, although no modification can be observed on the dispersion curves

Probing the basement of southern Tibet : evidence from crustal xenoliths entrained in a Miocene ultrapotassic dyke

A variety of felsic and mafic granulites and ultramafic rocks occur as xenoliths within a 12.7 Ma ultrapotassic dyke intruding Xigaze flysch immediately to the north of the Yarlung-Tsangpo suture zone in southern Tibet. Garnet-clinopyroxene-plagioclase-quartz thermobarometry on mafic granulite xenoliths gives temperatures of 1130-1330 °C and pressures between 22 and 26 kbar indicating equilibration in the high-pressure and ultrahigh-temperature granulite field and defining a geotherm of c. 16 °C km -1. Ultramafic xenoliths consist mainly of hornblende and biotite, probably of restitic crustal rather than mantle origin, and attained peak metamorphic conditions of 920-1130 °C and 17-24 kbar, whereas felsic granulites equilibrated at 870-900 °C at an inferred pressure of 17 kbar. In situ U-(Th)-Pb laser ablation inductively coupled plasma mass spectrometry dating of zircons shows that protoliths may include Proterozoic basement rocks, Late Cretaceous calc-alkaline tonalites of the Gangdese batholith root and/or remnants of a Neo-Tethyan oceanic arc. Certain zircons from a felsic granulite and an ultramafic xenolith have mean 206Pb/ 238U ages of 16.8 ± 0.9 Ma and 15.6 ± 0.6 Ma, respectively, and monazites from a micaceous xenolith yielded a mean 208Pb/ 232Th age of 14.4 ± 0.4 Ma. These results show that the southern Tibet basement reached a thickness of c. 80 km by 17-14 Ma at the latest and has remained unchanged until the present day. © 2009 Geological Society of London.link_to_subscribed_fulltex

Role of hypothalamic catecholamines in the regulation of luteinizing hormone and prolactin secretion in the ewe during seasonal anestrus

International audienc

Role of hypothalamic catecholamines in the regulation of luteinizing hormone and prolactin secretion in the ewe during seasonal anestrus

International audienc

Etude de faisabilite pour la modelisation et la simulation d'architecture de commande et de conduite d'ateliers de fabrication

Available from INIST (FR), Document Supply Service, under shelf-number : AR 16235 / INIST-CNRS - Institut de l'Information Scientifique et TechniqueSIGLEMinistere de l'Enseignement Superieur et de la Recherche, 75 - Paris (France)FRFranc