386 research outputs found
The race to securitize the Arctic in a post-Cold War scenario
The Arctic implies a planetary struggle to stop the rapid change of its ecosystem
caused by global climate change, with the global impact it could generate in the future. as a
consequence of this first ecological challenge, the Arctic scenario is becoming more interesting for
key transnational actors to develop new business opportunities related to mining exploitation, energy
reserves and logistics services, where the result will tend to prioritize business and safety on the
ecology, reaffirming the meta-tragedy in the arctic region. Due to the complexity of the Arctic
scenario, the preference for intergovernmental forums and the ambiguous interests and roles of its
actors, the inadequate trinomial between a global ecological tragedy, an individual economic
business and a collective security career will tend to subsist and increase its tragic effects about the
environmentEl Ártico implica una lucha planetaria para detener el rápido cambio de su ecosistema
causado por el cambio climático global, con el impacto global que podría generar en el futuro. Como
consecuencia de este primer desafío ecológico, el escenario del Ártico se está volviendo más
interesante para los actores transnacionales clave para desarrollar nuevas oportunidades de negocios
relacionadas con la explotación minera, las reservas de energía y los servicios logísticos, donde el
resultado tenderá a priorizar los negocios y la seguridad sobre la ecología, reafirmando la meta- tragedia en la región del Ártico. debido a la complejidad del escenario Ártico, la preferencia por
foros intergubernamentales y los intereses y roles ambiguos de sus actores, el trinomio inadecuado
entre una tragedia ecológica global, un negocio económico individual y una carrera de seguridad
colectiva tenderán a subsistir e incrementar sus efectos trágicos sobre el medio ambient
M2000 : an astrometric catalog in the Bordeaux Carte du Ciel zone +11 degrees < {delta} < +18 degrees
During four years, systematic observations have been conducted in drift scan
mode with the Bordeaux automated meridian circle in the declination band [+11 ;
+18]. The resulting astrometric catalog includes about 2 300 000 stars down to
the magnitude limit V_M=16.3. Nearly all stars (96%) have been observed at
least 6 times, the catalog being complete down to V_M=15.4. The median internal
standard error in position is about 35 mas in the V_M magnitude range [11 ;
15], which degrades to about 50 mas when the faintest stars are considered.
M2000 provides also one band photometry with a median internal standard error
of 0.04 mag. Comparisons with the Hipparcos and bright part of Tycho-2 catalogs
have enabled to estimate external errors in position to be lower than 40 mas.
In this zone and at epoch 1998, the faint part of Tycho-2 is found to have an
accuracy of 116 mas in alpha instead of 82 mas deduced from the model-based
standard errors given in the catalog.Comment: The catalogue can be fetched directly from:
ftp://cdsarc.u-strasbg.fr/cats/I/272 or queried from:
http://vizier.u-strasbg.fr/viz-bin/VizieR?-source=I/272 More information at :
http://www.observ.u-bordeaux.fr/~soubiran/m2000.ht
Growth and development of the third permanent molar in Paranthropus robustus from Swartkrans, South Africa
Third permanent molars (M3s) are the last tooth to form but have not been used to estimate age at dental maturation in early fossil hominins because direct histological evidence for the timing of their growth has been lacking. We investigated an isolated maxillary M3 (SK 835) from the 1.5 to 1.8-million-year-old (Mya) site of Swartkrans, South Africa, attributed to Paranthropus robustus. Tissue proportions of this specimen were assessed using 3D X-ray micro-tomography. Thin ground sections were used to image daily growth increments in enamel and dentine. Transmitted light microscopy and synchrotron X-ray fluorescence imaging revealed fluctuations in Ca concentration that coincide with daily growth increments. We used regional daily secretion rates and Sr marker-lines to reconstruct tooth growth along the enamel/dentine and then cementum/dentine boundaries. Cumulative growth curves for increasing enamel thickness and tooth height and age-of-attainment estimates for fractional stages of tooth formation differed from those in modern humans. These now provide additional means for assessing late maturation in early hominins. M3 formation took ≥ 7 years in SK 835 and completion of the roots would have occurred between 11 and 14 years of age. Estimated age at dental maturation in this fossil hominin compares well with what is known for living great apes
Neuropathic complications after 157 procedures of continuous popliteal nerve block for hallux valgus surgery. A retrospective study
SummaryBackgroundContinuous peripheral nerve block (CPNB), in particular at the popliteal fossa, is widely used in orthopedic surgery, allowing good postoperative analgesia. Possible neuropathic complications, however, remain poorly known.ObjectiveTo review the characteristics of peripheral neuropathy (PN) after sciatic CPNB at the popliteal fossa, estimating prevalence, severity, evolution and possible risk factors, especially those relating to the procedure.MethodsRetrospective study of PN associated with popliteal fossa CPNB for hallux valgus surgery, between November 1st, 2005 and November 1st, 2009. All procedures were analyzed (type of anesthesia, approach, nerve location technique, number of procedures by operator) with, for each case of PN, analysis of clinical and electromyographic data.ResultsOne hundred and fifty seven sciatic CPNBs were performed (92% women; mean age, 55 years). The approach was lateral (n=62), posterior (n=74) or unknown (n=21). Ultrasound guidance was combined to neurostimulation for 69 patients (44%). Three women (prevalence=1.91%), aged 19, 24 and 65 years respectively, developed associated common superficial peroneal and sural nerve injury (2), axonal on electromyography, with motor (n=1) and/or sensory (n=3) residual dysfunction.DiscussionThe higher prevalence found in the present study than in the literature (0 to 0.5%) raises questions of methodological bias or technical problems. The common peroneal and sural nerves seem to be exposed, unlike the tibial. Several mechanisms can be suggested: anesthetic neurotoxicity, direct mechanical lesion, or tourniquet-related ischemia and conduction block. Further studies are necessary to determine the ideal anesthetic procedure.ConclusionPatients should be informed of the potential risk, however rare, even during mild surgery. The best possible technique should be implemented, with reinforced surveillance.Level of evidenceLevel IV retrospective study
Методическая работа в дошкольной образовательной организации как условие развития профессионально-педагогической культуры педагогов
Тема работы актуальна. В ВКР представлена методическая работа с педагогами ДОУ, по формирования профессионально-педагогической культуры. Работа имеет практическую значимост
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