1,721,035 research outputs found
Misfire detection system based on the measurement of crankshaft angular velocity
No full textMisfire detection systems are becoming increasingly important in automotive market due to recent environmental issues (Euro rules).
An early misfire diagnosis also allows to prevent damages to the exhaust emission system and consequent costs for the user. Today few low cost methods exists in order to precisely detect single misfires in real time, the majority in fact require the use of expensive sensors (e.g. pressure sensors) or dedicated circuits (e.g. ionization current sensing). This work describes a method and electronic system capable of detecting misfires with good accuracy, using parameters such as the speed sensor signal, already available in commercial engines. The proposed method is exclusively based on the real time analysis of the crankshaft angular velocity and its variations. This is possible since each misfire event generates an abrupt perturbation
of the crankshaft angular velocity, that can be detected using an appropriate signal processing algorithm
Flexible Laser Tracing Systems for Defining Thin Film Hybrid Geometries
No full textA recent programme of technical collaboration between Alelco, DIE of Palermo and CRES of Monreale has led to the development and operative confirmation of a technique for delineating conductive microgeometries on various types of Substrates. This technique, using a flexible System of laser microlithography on planar (2-D) or three-dimensional (3-D) surfaces, has led to the development of several types of thin film components for use at both low and high frequencies. © 1994, MCB UP Limite
A survey on the thermal conditions experienced by a surgical team
No full textThe complex environment of the operating theatre is shared by a group of people having highly different needs: on one side, there is a surgical team whose work may last many hours and, on the other, an anaesthetized patient often subject to liquid infusion. Up to now, little consideration has been given to the different needs of the surgical team who may be affected according to their positions with respect to the scialytic lamp and their particular task. Clothing influences the comfort of the surgical team to a considerable degree: in fact, in some surgery (orthopaedics, neurosurgery and so on), surgeons and assistants must wear paper overalls beneath non-breathable plastic overalls and protective masks and caps; then, if X-rays are needed during surgery, the second surgeon and the assistants must also wear lead overalls and lead thyroid collars and gloves while the anaesthetists and nurses will keep on wearing non-breathable paper overalls. In consequence, the thermal resistance of t..
Copper patterning on dielectrics by laser writing in liquid solution
No full textA technique suitable for laser induced deposition of copper on LiNbO 3 and glass is presented. Deposition is achieved from Cu salt solution mixed with glycerol, after coating the surface with a very thin metal film. High resolution and low electrical resistivity can be achieved, using laser power levels in the 20-mW range. The technique can be used for electrode and interconnect fabrication in integrated optical devices, as well as mask repair or microelectronics applications
On the assessment of the environmental comfort in operating theatres
No full textThe operating theatre is a very complex environment shared, for a certain period, by a group of people having highly different needs: on one side, there is the surgical team that must carry out a demanding job that in some cases can be very stressful (e.g. orthopedics surgery or those lasting more than four hours) and on the other, there is the anesthetized patient often subject to liquid infusion.
Up to today little consideration has been given to the different needs of the surgical team whose members show different reactions according to their positions with respect to the scialytic lamp and above all to the task had within the team. Also the clothing influences the surgical team comfort degree: in fact, in some surgery (orthopedics, neurosurgery etc.) surgeons and assistants must wear non transpiring paper overalls beneath plasticized overalls besides protective masks and caps; then, if X-rays are needed during surgery, the second surgeon and the assistants must also wear lead overalls and lead thyroid collars and gloves while the anesthetists and nurses will keep on wearing non transpiring paper overalls; therefore the clothing thermal resistance of the surgical staff involved in the same surgical operation should be very different.
The purpose of the present work is to report the first data obtained during an experimental campaign carried out at the SS. Annunziata hospital in Cento (Ferrara, Italy) and presents the developed investigation methodology
A Software Defined Radio Platform Implementing a WiFi and ZigBee Receiver
No full textA successful attempt to design and implement a multi-standard compliant Basebnd Processor is here presented. By exploiting the potential of FPGA's reconfigurability, the received signal from RF stage have been processed in order to properly decode frames of IEEE 802.11 (WiFi) and IEEE 802.15.4 (ZigBee) protocols. both falling within the ISM band (centered at 2.45GHz). The experimental implementation carried out is a practical demonstration of the Software Defined Radio concept
Valutazione della temperatura interna mediante sonda timpanica in pazienti sottoposti ad intervento chirurgico
No full textArtificial dielectric optical structures: A challenge for nanofabrication
Full text linkDiffractive optical components can be made using multiple level kinoforms or single level artificial dielectric structures. The latter require the fabrication of pillars of equal depth but differing width and spacing. As a demonstration device, the diffractive optic equivalent of a wedge has been made in GaAs for use at 1.15 μm. The need for all pillars to have the same height was met by using a selective etch and a very thin etch-stop layer on AlGaAs. The experimental diffraction efficiency was 87.8%, among the best ever obtained and close to the theoretical maximum of 97.6%. © 1998 American Vacuum Society
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