The high voltage Padova test facility(HVPTF)is an experiment set in Padova,Italy,operating in the framework of the Neutral Beam Test Facility project of the International Thermonuclear Experimental Reactor(ITER).One o...The high voltage Padova test facility(HVPTF)is an experiment set in Padova,Italy,operating in the framework of the Neutral Beam Test Facility project of the International Thermonuclear Experimental Reactor(ITER).One of the purposes of HVPTF is to study the phenomenology of discharge events occurring between electrodes at high voltage differences over long vacuum gaps,which is crucial in the development of the neutral beam injector foreseen for ITER.The facility hosts a cylindrical vacuum vessel with stable pressure control,where two electrodes of different possible geometries can be mounted.Two independent power supplies allow for total voltage differences up to 800 kVDC with adjustable gap widths up to 250 mm.Among the diagnostics,a gas electron multiplier(GEM)detector is installed for acquisition of x-ray emission on a radial line of sight of the vessel.This paper presents a study of the experimental sessions featuring stainless-steel needle-plane electrodes.The analysis is based on the GEM data,in relation to the information on current and voltage of the two power supplies.The events are characterised in terms of both temporal and spatial evolution,providing sequential emission profiles with spatial resolution of tens of millimetres on timescales of the order of hundreds of nanoseconds.展开更多
By using mercaptopropyltrimethoxysilane （MPTS） self-assembled monolayers （SAMs）, electroless silver plating is developed for the metallization of near-field optical fiber probes. This method has the advantages of ...By using mercaptopropyltrimethoxysilane （MPTS） self-assembled monolayers （SAMs）, electroless silver plating is developed for the metallization of near-field optical fiber probes. This method has the advantages of controllability, no pinholes, convenience, low cost, and smooth tip surface. The metallized probes are characterized by optical microscopy, scanning electron microscopy （SEM）, and energy dispersive X-ray spectroscopy （EDXS）.展开更多
Through five diverse cases involving an attempt of murder,cold murder in 1988,two contemporary murder investigations in the past 10 years and sexual assault,this paper will demonstrate how combined pedological,mineral...Through five diverse cases involving an attempt of murder,cold murder in 1988,two contemporary murder investigations in the past 10 years and sexual assault,this paper will demonstrate how combined pedological,mineralogical and chemical investigations,have been critical in developing reliable soil information,from landscape to microscopic scales,to help in forensic investigations,which were used as evidence in Australian State Supreme courts.A wide range of natural soil types(sandy coastal beaches,grey clayey wetlands,black muddy alluvium in river-beds,brown clayey and loamy soils in wooded areas)and humanmade soil types(comprising brick and road gravel fragments)across Australia were used in these forensic investigations to associate materials taken from questioned items,such as shoes,clothing,shovels or vehicles,with a specific control location or the crime scene.To illustrate the power of soil analysis in criminal investigations it is beneficial to share successful case examples to demonstrate the potential value of this somewhat under-utilized forensic tool.Here we will discuss how pedological and soil mineralogy expertise,especially in using soil maps and X-ray diffraction(XRD),has been used as a contributory part of each overall historical(cold)and recent criminal investigation.展开更多
文摘The high voltage Padova test facility(HVPTF)is an experiment set in Padova,Italy,operating in the framework of the Neutral Beam Test Facility project of the International Thermonuclear Experimental Reactor(ITER).One of the purposes of HVPTF is to study the phenomenology of discharge events occurring between electrodes at high voltage differences over long vacuum gaps,which is crucial in the development of the neutral beam injector foreseen for ITER.The facility hosts a cylindrical vacuum vessel with stable pressure control,where two electrodes of different possible geometries can be mounted.Two independent power supplies allow for total voltage differences up to 800 kVDC with adjustable gap widths up to 250 mm.Among the diagnostics,a gas electron multiplier(GEM)detector is installed for acquisition of x-ray emission on a radial line of sight of the vessel.This paper presents a study of the experimental sessions featuring stainless-steel needle-plane electrodes.The analysis is based on the GEM data,in relation to the information on current and voltage of the two power supplies.The events are characterised in terms of both temporal and spatial evolution,providing sequential emission profiles with spatial resolution of tens of millimetres on timescales of the order of hundreds of nanoseconds.
基金This work was supported by the National Natural Science Foundation of China under Grants No.60171005 and 60121101.
文摘By using mercaptopropyltrimethoxysilane （MPTS） self-assembled monolayers （SAMs）, electroless silver plating is developed for the metallization of near-field optical fiber probes. This method has the advantages of controllability, no pinholes, convenience, low cost, and smooth tip surface. The metallized probes are characterized by optical microscopy, scanning electron microscopy （SEM）, and energy dispersive X-ray spectroscopy （EDXS）.
文摘Through five diverse cases involving an attempt of murder,cold murder in 1988,two contemporary murder investigations in the past 10 years and sexual assault,this paper will demonstrate how combined pedological,mineralogical and chemical investigations,have been critical in developing reliable soil information,from landscape to microscopic scales,to help in forensic investigations,which were used as evidence in Australian State Supreme courts.A wide range of natural soil types(sandy coastal beaches,grey clayey wetlands,black muddy alluvium in river-beds,brown clayey and loamy soils in wooded areas)and humanmade soil types(comprising brick and road gravel fragments)across Australia were used in these forensic investigations to associate materials taken from questioned items,such as shoes,clothing,shovels or vehicles,with a specific control location or the crime scene.To illustrate the power of soil analysis in criminal investigations it is beneficial to share successful case examples to demonstrate the potential value of this somewhat under-utilized forensic tool.Here we will discuss how pedological and soil mineralogy expertise,especially in using soil maps and X-ray diffraction(XRD),has been used as a contributory part of each overall historical(cold)and recent criminal investigation.
