Fraunhofer EMFT’s research and manufacturing portfolio includes piezoelectrically actuated silicon micro diaphragm pumps with passive flap valves. Research development in the field of microfluidics have been dedicated for many years to use micropumps generating positive negative pressures, as well delivering various media. However, some applications, only small amounts fluid need be pumped, com...

When it switches on in 2008, the 26.7 km Large Hadron Collider (LHC) at CERN, will have the world's largest vacuum system operating over a wide range of pressures and employing an impressive array of vacuum technologies. This system is composed by 54 km of UHV vacuum for the circulating beams and 50 km of insulation vacuum around the cryogenic magnets and the liquid helium transfer lines. Over ...

Based on the soft sensor techniques, five external factors that affect the cane sugar crystallization process are used as auxiliary variables, i.e., the syrup Brix and temperature, vacuum, steam pressure and feed flow, while the sucrose supersaturation is considered as the key variable. Then a soft sensor method for the sucrose supersaturation is developed based on kernel partial least squares....

We have designed, fabricated, and tested a new type of thermal shear-stress sensor. The sensor consists of a 2 m wide polysilicon thermistor (with a range of lengths, 80-200 m) on a 1.2 m thick silicon-nitride diaphragm, which is on top of a vacuum cavity 200 200 2 m in size. The vacuum cavity provides a good thermal isolation between the resistive element and the substrate; shear-stress sensit...

in this study, a cylindrical bolling probe was developed and evaluated for measuring stress in soil under tire traffic. the probe consists of a silicon rubber head for sensing the soil stress, a pvc tube for transferring the liquid pressure, a digital pressure sensor and a syringe for filling the probe with water and adjusting the initial inclusion pressure. a tank with pressurized air was used...

The small silicon chip of Schottky diode (0.8 × 0.8 0.4 mm3) with planar arrangement electrodes (chip PSD) as temperature sensor, which functions under the operating conditions pressure was developed. forward current-voltage I–V characteristic PSD is determined by potential barrier between Mo and n-Si (ND = 3 1015 cm?3). Forward voltage UF 208 ± 6 mV coefficient TC -1.635 0.015 mV/°C (with line...

BACKGROUND Negative-pressure wound therapy is traditionally achieved by attaching an electrically powered pump to a sealed wound bed and applying subatmospheric pressure by means of gauze or foam. The Smart Negative Pressure (SNaP) System (Spiracur, Inc., Sunnyvale, Calif.) is a novel ultraportable negative-pressure wound therapy system that does not require an electrically powered pump. METH...

This paper describes the engineering and development of a process to electrically and mechanically bond a large area, backlit charge-coupled device (CCD) sensor to a metallized substrate, using a materials system compatible with a high vacuum tube configuration. The CCD sensor is used in light sensor and digital camera devices. Currently, CCD devices are mechanically bonded to substrates using ...

Pressure control valve (PCV) is implemented in internal combustion engine to regulate crankcase pressure. In this study, the performance of a diaphragm PCV valve is investigated numerically and experimentally. Firstly, numerical simulation is carried out using commercial code to predict the flow and pressure distribution inside the valve. Furthermore, downstream and upstream pressure of the val...