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.
DC neutral breakers are used to reconfigure HVDC transmission systems. One example is the Metallic Return Transfer Breaker (MRTB) that commutates the current from the ground to an overhead line or cable reducing time duration with current flowing in the ground path. An MRTB consists of a passive LC-circuit in parallel with an AC breaker that triggers a resonance by its arc voltage characteristics,...
Research to quantify the attenuation of 150 GHz and 300 GHz EM waves in sand has been conducted and the results are presented in this paper to investigate the performance of low-THz sensing for outdoor applications when an antenna radome might be contaminated by sand, which is one of the most common types of contaminant in outdoor environments. The signal power deviation has been studied as a function...
Monostatic and bistatic reflections of different commercial absorbers and also floor carpets have been measured at 300 GHz and presented in this paper. Monostatic reflection measurements have been done over the angular range of 50° to 130° and bistatic reflection measurements have been done over the angular range of 0° to 50°. The lowest reflectivity was achieved from wool carpet with median reflectivity...
SpaceWire is a full-duplex, point-to-point, high-speed serial data transfer standard which is intended for use in further on-board spacecraft, space missions and applications. However, space environment is harsh and complex which requires a communication network with high reliability. It is inevitable that SpaceWire network link fault or SpaceWire equipment damage is able to change the SpaceWire network...
This paper investigates signal reduction due to contamination of low-THz radar radomes for outdoor applications. A measurement methodology is proposed to characterise the effect of different obscurants on electromagnetic wave propagation. This is achieved by measuring the ratio of two signals: one reflected from the reference target through the contaminated radome and another through the radome without...
One common drawback of virtually all current data embedding methods is the fact that the original image is inevitably distorted by some small amount of noise due to data embedding itself. This distortion typically cannot be removed completely due to quantization, bit-replacement, or truncation at the grayscales 0 and 255. Although the distortion is often quite small, it may not be acceptable for medical...
In this paper, we study non-adaptive and adaptive steganographic techniques for images with low number of colors in palette image formats. We have introduced the concept of optimal parity assignment for the color palette and designed an efficient algorithm that finds the optimal parity assignment. The optimal parity is independent of the image histogram and depends only on the image palette. Thus,...
Wideband beamforming is of high significance in the field of array signal processing. However, most of the present methods would fail when some sensors of the receive array are not working and this situation occurs frequently in practical experiments. To address the problem, a new method of wideband beamforming based on Compressive Sensing(CS) is proposed. The received signal is first split into sub-band...
In hybrid renewable power systems, the use of a multiple-input dc/dc converter (MIC) leads to simpler circuit and lower cost, compared to the conventional use of several single-input converters. This paper proposed a novel three-input buck/boost/buck-boost converter, which can be applied in all kinds of input voltage application. All the power sources in this converter can deliver power to the load...
In a hybrid renewable power system, the use of a multiple-input dc/dc converter (MIC) leads to simpler circuit and lower cost, compared with the conventional use of several single-input converters. This paper focuses on the optimizing design of dual-input DC /DC converter. Different to single-input DC/DC converters, the parameters design of MIC is very complicated. This is because a MIC will operate...
In this paper, the Gauss-Seidel iteration method is used to investigate the exponential stability of a class of linear time-varying singularly perturbed systems. A simple algebraic criterion for exponential stability for all small enough values of singular perturbation parameter ε is obtained. Moreover, an upper bound on the values of ε for which the system preserves exponential stability can be found...
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.