The Infona portal uses cookies, i.e. strings of text saved by a browser on the user's device. The portal can access those files and use them to remember the user's data, such as their chosen settings (screen view, interface language, etc.), or their login data. By using the Infona portal the user accepts automatic saving and using this information for portal operation purposes. More information on the subject can be found in the Privacy Policy and Terms of Service. By closing this window the user confirms that they have read the information on cookie usage, and they accept the privacy policy and the way cookies are used by the portal. You can change the cookie settings in your browser.
This paper presents a new protection scheme for AC zonal distribution system proposed for future marine power systems based on active impedance estimation. This technique actively imposes small transient disturbances onto the system at a point of measurement to excite the system in real time and estimate the system impedance over a broad frequency range at that point. The identified impedance can...
The voltage coupled to wayside cables is a very common EMC interface in electric transportation system, that has impact on several subsystems. The choice of the calculation method and its accuracy influences the design and its optimization. Some real cases are used as an example to identify the relevant elements and to derive some general rules to guide the choice.
A major demand of the aviation industry is the reduction of emissions in combination with cost efficiency improvement. One possible approach to face this challenge is the replacement of the conventional auxiliary power unit by a fuel cell system within a “more electric aircraft” design. In order to integrate a fuel cell system into the grid architecture of modern aircraft new protection arrangements...
This work presents a new systematic approach to design impedance measurement systems for living cell detection and monitoring. The hardware of the system was implemented in PCBs as a proof-of-concept. A DAC channel generates the required excitation signals to be applied onto the living cell and the current flowing through the cell is converted into voltage and digitized by an ADC channel. An FPGA...
This paper describes a novel fully integrated circuit implemented in standard 0.35 ??m CMOS technology dedicated to biological signal measurement such as ECG or EEG signals. Based on a new CMOS current conveyor (a low power 60 ??A @ ??1.5 V power supply, 88 ?? 100 ??m2 area, 100 MHz bandwidth and 10 GHz equivalent GBW circuit) the instrumentation amplifier used in this IC has a weaker offset and a...
This paper describes a methodology to measure the low-frequency noise of InP-based transistors. These transistors have demonstrated transition frequencies (ft) greater than 200 GHz, generally achieved at current densities in excess of 200 kA/cm2. Depending on the DC current gain, this may represent base currents of some mA. For the first time, curves of Sib, Sic and Sibic for base currents of up to...
The measurement of volume water content in stem based on dielectric constant has been utilizing widely. A study based on SWR (standing wave ratio) technique was presented in this paper. The sensor probe plays an important role in determination of stem water content with a variety of instruments. Therefore, it is critical to study the length of the probe in order to improve the measuring accuracy of...
This paper is concerned with the phenomena of very fast transient overvoltages (VFTO) invading the transformer windings. Some literatures have pointed out that the insulation breakdown usually locates near the entrance of the windings. So it is very important to study the voltage distribution along the coils near the entrance of the windings under VFTO. A new hybrid model is presented to simulate...
Linear Induction Motors (LIMs) have asymmetrical parameters. It causes LIMs thrust pulsation. Some methods have been proposed to avoid the thrust pulsation such as DTC (Direct Thrust Control) with PI control. These methods need parameter information. This paper proposes a method to identify the asymmetrical parameters by DC Decay Testing Method on alpha-beta axis. This method identifies the parameters...
Set the date range to filter the displayed results. You can set a starting date, ending date or both. You can enter the dates manually or choose them from the calendar.