Siemens (Canada)

About: Siemens (Canada) is a company organization based out in Oakville, Ontario, Canada. It is known for research contribution in the topics: Combustion & Exhaust gas recirculation. The organization has 271 authors who have published 334 publications receiving 4488 citations.

Frequency and phase drift correction of magnetic resonance spectroscopy data by spectral registration in the time domain

Abstract: Purpose Frequency and phase drifts are a common problem in the acquisition of in vivo magnetic resonance spectroscopy (MRS) data If not accounted for, frequency and phase drifts will result in artifactual broadening of spectral peaks, distortion of spectral lineshapes, and a reduction in signal-to-noise ratio (SNR) We present herein a new method for estimating and correcting frequency and phase drifts in in vivo MRS data Methods We used a simple method of fitting each spectral average to a reference scan (often the first average in the series) in the time domain through adjustment of frequency and phase terms Due to the similarity with image registration, this method is referred to as “spectral registration” Using simulated data with known frequency and phase drifts, the performance of spectral registration was compared with two existing methods at various SNR levels Results Spectral registration performed well in comparison with the other methods tested in terms of both frequency and phase drift estimation Conclusions Spectral registration provides an effective method for frequency and phase drift correction It does not involve the collection of navigator echoes, and does not rely on any specific resonances, such as residual water or creatine, making it highly versatile Magn Reson Med 73:44–50, 2015 © 2014 Wiley Periodicals, Inc

Wireless local area network with clients having extended freedom of movement

Abstract: A wireless virtual local area network (VLAN) and a device selectively connecting to the wireless VLAN over a second wireless network that may be independent of the wireless VLAN. The device is capable of connecting to at least the wireless VLAN and to the second wireless network. Wireless VLAN access points are each connected to an Ethernet aggregation switch, which is VLAN aware and matches client traffic from connected access points with access VLANs. A wireless VLAN switch maintains an association table between access VLANs and core VLANs. The second wireless network may be remotely connected over the Internet or a private network to a tunnel endpoint. The tunnel endpoint is connected to the VLAN switch, which uses the association table to manage free-form client traffic between connected devices and other mobile stations at access VLANs and appropriate core VLANs.

Internal combustion engine total cooling control system

Abstract: An engine cooling system includes an engine 14 ; a radiator assembly including a radiator 16 and a fan 19 driven by an electric fan motor 21 ; a coolant circulation circuit 12 interconnecting the engine and the radiator for circulating coolant; a by-pass circuit 24 connected to the coolant circulation circuit so that coolant may by-pass the radiator; an electrically powered variable speed coolant pump 28 disposed in the coolant circulation circuit to pump coolant through the coolant circulation circuit; control valve structure 26 constructed and arranged to control mass flow of coolant through the radiator; an engine temperature sensor 54 to detect a temperature of engine coolant; a radiator temperature sensor 58 to detect a temperature of air exiting the radiator or a temperature of coolant at an outlet of the radiator, and a controller 36 operatively connected with the electric fan motor, the coolant pump, the control valve structure, the engine temperature sensor, and the radiator temperature sensor. The controller selectively controls (1) the control valve structure, (2) operation of the coolant pump based on signals received from the engine temperature sensor and (3) operation of the electric fan motor based on a signal received from the radiator temperature sensor, thereby controlling an operating temperature of the engine to approach a target operating temperature. Methods of cooling an engine are also provided.

Pump motor having fluid cooling system

Abstract: A brushless water pump motor includes a pump housing having an impeller chamber with an impeller disposed therein, and a motor assembly coupled at a first end thereof to the pump housing. The motor assembly includes a stator assembly having laminations and windings, the stator having an interior portion defining a rotor chamber in which a rotor assembly is disposed. There is a partition structure provided between the rotor assembly and the stator assembly for isolating the stator assembly from the rotor chamber, and the partition structure has a wall in communication with the rotor chamber. The pump/motor assembly further includes a hollow shaft in communication with the rotor chamber, such that the rotor assembly and impeller are mounted on the hollow shaft. A bearing structure is operatively associated with the hollow portion of the shaft for supporting the shaft for rotational movement. The pump motor further includes an electronic control unit coupled to a second end of the motor assembly and has an upper surface in communication with the rotor chamber. A fluid flow path structure is arranged to permit fluid to pass from a high pressure portion of the impeller chamber to enter the rotor chamber to submerge the rotor assembly in the fluid and fluid may contact the upper surface of the electronic control unit to cool the electronic control unit. By contacting the wall of the partition structure, the fluid cools the laminations and windings, and by entering the hollow portion of the shaft, the fluid cools the bearing structure.