1,145 research outputs found
Environnements sédimentaires des quartz de la série paléocène du dôme de Diass (Sénégal oriental)
L'exoscopie des quartz à la base de la série paléocène du Dôme de Diass a permis, d'une part de reconstituer leurs milieux d'évolution et d'autre part d'avoir une idée sur les conditions climatiques qui ont présidé à leur dépôt. Les traces d'action mécanique montrent que ce sédiment est d'origine éolienne. Au cours de la transgression paléocène, il a évolué vers les domaines inter et infratidaux. Le transport et l'accumulation du sable en milieu continental démontrent qu'un climat semi-aride à aride devait y régner. (Résumé d'auteur
Processing and display of atmospheric phenomenaa data
A series of technical efforts dealing with various atmospheric phenomena is described. Refinements to the Potential in an Electrostatic Cloud (PEC) model are discussed. The development of an Apple III graphics program, the NSSL Lightning Data Program and a description of data reduction procedures are examined. Several utility programs are also discussed
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The Use of Layered Freeform Fabrication Technologies to Produce Tissue Engineering Scaffolds for Skull Patches
Congenital skull defects in infants are difficult to correct using metal plates due to the growth of
the skull. Tissue engineering of bone patches could be the answer to help such patients. Custom
scaffolds have been designed based on Computed Tomography (CT) images of the patient’s
skull. An in-house developed single screw extruder, casting and a commercial laser cutter has
been evaluated in the fabrication of pure polycaprolactone (PCL) scaffolds as well as PCL mixed
with hydroxyapatite (HA) scaffolds. Evaluation criteria for each process included the ability to
maintain an optimal pore size for cells to proliferate, inclusion of micro surface properties for
cell adhesion, incorporation of hydroxyapatite, and ability to maintain desired shape. The
mechanical properties of the fabricated scaffolds will be presented in this paper as well as initial
cell seeding results with human adipose-derived adult stem (hADAS) cells.Mechanical Engineerin
Voltage driven, local, and efficient excitation of nitrogen-vacancy centers in diamond
Magnetic sensing technology has found widespread application in industries as
diverse as transportation, medicine, and resource exploration. Such use cases
often require highly sensitive instruments to measure the extremely small
magnetic fields involved, relying on difficult to integrate Superconducting
Quantum Interference Device (SQUID) and Spin-Exchange Relaxation Free (SERF)
magnetometers. A potential alternative, nitrogen vacancy (NV) centers in
diamond, has shown great potential as a high sensitivity and high resolution
magnetic sensor capable of operating in an unshielded, room-temperature
environment. Transitioning NV center based sensors into practical devices,
however, is impeded by the need for high power RF excitation to manipulate
them. Here we report an advance that combines two different physical phenomena
to enable a highly efficient excitation of the NV centers: magnetoelastic drive
of ferromagnetic resonance (FMR) and NV-magnon coupling. Our work demonstrates
a new pathway to combine acoustics and magnonics that enables highly energy
efficient and local excitation of NV centers without the need for any external
RF excitation, and thus could lead to completely integrated, on-chip, atomic
sensors.Comment: Fixed an issue with the display of figure
Extraction of incarcerated medial epicondyle from the elbow joint using conventional nerve stimulator:a case report
INTRODUCTION: Incarceration of the medial epicondyle is a well-recognised sequelae following closed reduction of the elbow. Manipulation for extraction is not usually successful and hence an incarcerated medial epicondyle is usually an indication for open reduction and fixation. CASE PRESENTATION: We describe a simple technique of closed reduction using a conventional nerve stimulator to extract an incarcerated medial epicondyle in a 13-year-old Caucasian boy. This technique uses contraction of the attached common flexor muscles to indirectly extract the trapped medial epicondyle. CONCLUSIONS: This is a simple technique using a commonly available nerve stimulator and may obviate the need for extensile open reduction for extraction of the incarcerated medial epicondyle. We would recommend this technique where closed reduction methods have failed
Analysis of fire deaths in Poland and influence of smoke toxicity
Dwelling fires have changed over the years because building contents and the materials used in then have changed. They all contribute to an ever-growing diversity of chemical species found in fires, many of them highly toxic. These arise largely from the changing nature of materials in interior finishes and furniture, with an increasing content of synthetic materials containing higher levels of nitrogen, halogen and phosphorus additives. While there is still a belief that carbon monoxide is the major lethal toxic agent in fires, the hydrogen cyanide and acid gases released from these additives are now well-recognised as major contributory causes of incapacitation, morbidity and mortality in domestic fires. Data for the total number of 263 fire death cases in the Mazowieckie region (mainly Warsaw area) of Poland between 2003-2011 for dwellings fires were obtained from pathologists, forensic toxicologists, fire fighters and analysed. Factors contributing to the death such as the findings of the full post mortem examination (age, sex, health status, burns), the toxicological analysis (carbon monoxide, alcohol etc.), and a thorough investigation of the scene (fire conditions, fuel, etc.) were taken into account and are summarised. [Abstract copyright: Copyright © 2017 Elsevier B.V. All rights reserved.
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