Serwis Infona wykorzystuje pliki cookies (ciasteczka). Są to wartości tekstowe, zapamiętywane przez przeglądarkę na urządzeniu użytkownika. Nasz serwis ma dostęp do tych wartości oraz wykorzystuje je do zapamiętania danych dotyczących użytkownika, takich jak np. ustawienia (typu widok ekranu, wybór języka interfejsu), zapamiętanie zalogowania. Korzystanie z serwisu Infona oznacza zgodę na zapis informacji i ich wykorzystanie dla celów korzytania z serwisu. Więcej informacji można znaleźć w Polityce prywatności oraz Regulaminie serwisu. Zamknięcie tego okienka potwierdza zapoznanie się z informacją o plikach cookies, akceptację polityki prywatności i regulaminu oraz sposobu wykorzystywania plików cookies w serwisie. Możesz zmienić ustawienia obsługi cookies w swojej przeglądarce.
In order to solve the field safety monitoring problem about high sulfur-containing natural gas purification plant commissioning test, designed and developed multi-sensor wireless monitoring system, and carried out the field application at Guangyuan gas field natural gas purification plant of SINOPEC. Firstly, introduced designs of multi-sensor wireless monitoring system in details, including the software...
1+1 type distributed-side pumping active fibers were fabricated. Pumped with 976nm LD, over 1kW output power was achieved at 1064nm and 581W power was launched into the coupling unit via one port.
We report on the fabrication of a kW-level Yb-doped fiber by using chelate precursor doping technique. Lasing performance was tested up to 1 kW laser output with slope efficiency of 81.8%.
By using rare-earth-halide gas-phase-doping technique, we fabricated Yb-doped large-mode-area fiber preform. Yb concentration is of ∼9500ppmw in core area and 951W@1064nm laser output was obtained with a slope efficiency of 83.3%.
Due to the video light underground coal mine is gloomy and not uniform, and lack the color contrast information, target and background is similar, the human motion detection and segmentation is difficult to process quickly. It is still a difficult problem to design a target detection and segmentation model of dynamic human body in the complex environment underground coal mine. A gait recognition method...
Most cache designs support single or double bit-level error detection and correction in cache lines. However, a single error may distort a whole byte or even more, resulting in much higher decoding complexity than that of bit-level distortions. Thereby this paper proposes a new group testing based error correcting code (GTB code) for byte-level error locating and correcting which provides much stronger...
As an alternative to water, propylene carbonate (PC) has a good application prospect in the compact pulsed power sources for its breakdown strength higher than that of water, resistivity bigger than 109 Ω•m and low freezing temperature (−49 °C). In this paper, the investigation into dielectric breakdown of PC and PC-based nano-fluids (NFs) subjected to high amplitude electric field is presented with...
System testing and invariant detection is usually conducted from the user interface perspective when the goal is to evaluate the behavior of an application as a whole. A large number of tools and techniques have been developed to generate and automate this process, many of which have been evaluated in the literature or internally within companies. Typical metrics for determining effectiveness of these...
Development of high power microwave (HPM) requires high power pulse conditioning system with high output power, small volume and wide application range1–2. Propylene carbonate (PC), because of its great dielectric constant and high breakdown strength, has attracted extensive attention in high energy storage liquid dielectrics of Pulse Forming Line. In this paper, we investigated the polarity effects...
Liquid dielectric has been widely used as the energy storage medium in Pulse Forming Line (PFL) due to its high density, good self-healing and easy-shaping[1-2]. One of the liquid dielectric breakdown model and mechanism is the bubble discharge theory which successfully providing an explanation of pressure impact on liquid electric breakdown strength. In this paper, based on the bubble discharge theory,...
This paper proposes a new control scheme for doubly-fed induction generators based wind turbines (DFIG-WT) in microgrids that operate in multiple modes. The DFIG-WT is controlled as a droop voltage source by the rotor side converter, using the indirect stator flux oriented vector (ISFO) control technique. The proposed control scheme enables the DFIG-WT to track the secondary control command given...
Since IEEE 802.11ad doesn't have any recovery mechanism for multicast technology at Media Access Control (MAC) layer, the lost packets can't be detected and retransmitted under the influence of interference, conflictions or other issues. Given this, a Multi-Leader Based Protocol (MLBP) is proposed to reduce the control overhead under the premise of improving the reliability of Millimetre Wave WPANs...
With rapid growth of installed wind power capacity worldwide and significant development of wind turbine generator (WTG) technologies, WTGs gradually have capability to participate in system frequency regulation. To this regard, the typical WTG frequency control strategies, such as inertial emulation, de-loading control, over-production and droop control are investigated in detail to reflect the development...
Most of existing fault-ride-through (FRT) control strategies are based on the vector power control, which is suitable for wind turbine generators (WTGs) connected to strong power grid, but not for the synchronized control generally designed for the weak grid and islanded grid. To solve the FRT problem for the synchronized-control DFIG, a novel FRT control strategy is proposed. Compared with previous...
With worldwide promotion of electric vehicles (EVs), it is possible to make flexible EV dispatch to support power grid operation, even assisting accommodation of intermittent renewable power. Under the framework of time-of-use (TOU) pricing mechanism, this paper focuses on how to determine a reasonable TOU price to influence the EV's charging habits for the purpose of load leveling. Firstly, EV load...
Aiming to identify and test the encryption measures of the data transmitted by ZigBee protocol, this paper studies secure working mode with ZigBee protocol and proposes a new security testing method based on randomness detection. This method synthetically considers the randomness of sequences and effectiveness, and uses the typical randomness detection algorithm to construct a reasonable testing program...
In the field of seismic interpretation, univariate data-based maps are commonly used by interpreters, especially for fault detection. In these maps, the contrast between target regions and the background is one of the main factors that affect the accuracy of interpretation. Since univariate data-based maps are not capable of providing a high-contrast representation, to overcome this issue, we turn...
Multi-label learning deals with the problem where each training example is associated with a set of labels simultaneously, with the set of labels corresponding to multiple concepts or semantic meanings. Intuitively, the multiple labels are usually correlated in some semantic space while sharing the same input space. As a consequence, the multi-label learning process can be augmented significantly...
In this paper, we propose a robust proximal classifier via absolute value inequalities (AVIPC) for pattern classification. AVIPC determines K proximal planes by solving K optimization problems with absolute value inequalities. In AVIPC, each proximal plane is closer to one class and far away from the others. By using the absolute value inequalities, AVIPC is more robust and sparse than traditional...
Voice capacity over wireless local area networks (WLANs) can be increased by the statistical multiplexing among on/off voice calls. However, in previously proposed schemes, the admitted voice calls that transit from silence state to talkspurt state are mixed up with the new voice calls to contend for the channel. The increase in the traffic load of new voice users could degrade the performance of...
Podaj zakres dat dla filtrowania wyświetlonych wyników. Możesz podać datę początkową, końcową lub obie daty. Daty możesz wpisać ręcznie lub wybrać za pomocą kalendarza.