Malaria : with special reference to its prevalence in Trinidad, B.W.I.

A summary of all these cases shows that there were forty -seven operations with twenty -three deaths, a rather high mortality.el. That there are cases of spontaneous recovery from malaria is an undoubted fact. One has known of numbers of cases of persons at Cedros and Chag- uanas, who with typical mild malarial attacks have taken no drugs whatever and have yet recovered in a couple of weeks. Probably in such cases the para- sites run a natural course, and the process of ex- tinction is helped by the phagocytic action of the leucocytes as well as the endothelial cells of the spleen. The writer, on two occasions, in fresh blood preparations under the microscope, saw the process of pha`ocytosis. The leucocyte (mononuclear) was near a free spherical form of parasite, and gradually by throwing out pseudopodia, envelóped the parasite and its included pigment. Hence, pigment- ed leucocytes are always found in the blood after a time in all cases of malaria

Conception et mise en oeuvre d'un reacteur d'epitaxie GaInAs/InP par la methode aux hydrures, analyse des conditions de croissance

CNRS TD Bordereau / INIST-CNRS - Institut de l'Information Scientifique et TechniqueSIGLEFRFranc

Design and evaluation of a new 2.2 MV pulse generator to drive existent EMP simulators while reducing SF6 emission

International audienc

Design and Evaluation of a New 2.2-MV Pulse Generator to Drive EMP Simulators While Reducing SF6 Emission

International audienc

Evaluation d’une nouvelle architecture pour des générateurs impulsionnels de classe Mégavolt minimisant la pollution liée aux techniques d’isolation

International audienc

Design and evaluation of a new 2.2 MV pulse generator to drive current EMP simulators while reducing S6 emission

International audienc

Droit européen des droits de l'Homme (CEDH)

International audienc

A short-pulse mode for the SPHINX LTD Z-pinch driver

International audienceThe SPHINX machine is a 6MA, 1 μs, LTD Z-pinch driver at CEA Gramat (France) and primarily used for studying radiation effects. Different power amplification concepts were examined in order to reduce the current rise time without modifying the generator discharge scheme, including the Dynamic Load Current Multiplier (DLCM) proposed by Chuvatin [1]. A DLCM device, capable of shaping the current pulse without reducing the rise time, was developed at CEA. This device proved valuable for isentropic compression experiments in cylindrical geometry [2]. Recently, we achieved a short pulse operation mode by inserting a vacuum closing switch between the DLCM and the load. The current rise time was reduced to ∼ 300 ns. We explored the use of a reduced-height wire array for the Dynamic Flux Extruder in order to improve the wire array compression rate and increase the efficiency of the current transfer to the load. These developments are presented. Potential benefits of these developments for future Z pinch experiments are discussed. [1] A.S. Chuvatin, Dynamic Current Multiplier; 14th Symposium on High Current Electronics, Tomsk, Russia, pp 232-235 (2006). [2] T. d'Almeida et al, Phys. Plasmas, 20, 092512-1 092512-16 (2013)

Ramp compression of a metallic liner driven by a shaped 5 MA current on the SPHINX machine

International audienceSPHINX is a 6MA, 1-μs Linear Transformer Driver operated by the CEA Gramat (France) and primarily used for imploding Z-pinch loads for radiation effects studies. Among the options that are currently being considered for improving the generator performances, there is a compact Dynamic Load Current Amplifier (DLCM). A method for performing magnetic ramp compression experiments, without modifying the generator operation scheme, was developed using the DLCM to shape the initial current pulse. We present the overall experimental configuration chosen for these experiments, based on electrical and hydrodynamic simulations. Initial results obtained over a set of experiments on an aluminum cylindrical liner, ramp-compressed to a peak pressure of 23 GPa, are presented. Details of the electrical and Photonic Doppler Velocimetry (PDV) setups used to monitor and diagnose the ramp compression experiments are provided. Current profiles measured at various locations across the system, particularly the load current, agree with simulated current profile and demonstrate adequate pulse shaping by the DLCM. The liner inner free surface velocity measurements agree with the hydrocode results obtained using the measured load current as the input. Higher ramp pressure levels are foreseen in future experiments with an improved DLCM system. oral communication, abstract in Bulletin of the American Physical Society, vol 58, num 7, V5.0000