China filters Internet traffic in and out of the country. In order to circumvent the firewall, it is helpful to know where the filtering occurs. In this work, we explore the AS-level topology of China’s network, and probe the firewall to find the locations of filtering devices. We find that even though most filtering occurs in border ASes, choke points also exist in many provincial networks. Th...

The expected high penetration of battery chargers for electric vehicles (EV) in electric networks is foreseen as a potential problem for power quality. Battery chargers are nonlinear devices that inject harmonic currents and pollute network voltages. Thus, their harmonic emissions must be analyzed and reduced by harmonic mitigation techniques to avoid future problems. This paper analyzes and re...

Purpose. Investigation of the distribution harmonic power components in circuit a dynamic voltage restorer. Methodology. On basis differential equations restorer, search for relationship between mode parameters and elements is performed. obtained expressions, model regulator was created using methods mathematical modeling visual programming environment.. Findings. The that reflect restorer are ...

 Understanding the flow behaviour in a gas well is crucial for future production strategies, obtaining bottomhole conditions from wellhead production data, analyzing production data and estimating reservoir properties. In this work, the pressure profile and flow regime are studied on four wells of a multi-well, multi-layer gas-condensate reservoir, producing at high rate. The wells are deviate...

The article presents an analytical method for optimizing the geometry of magnetic core a three-phase compensation choke. describes process identification fringing fields and corresponding reluctances core, flux density calculation even in case supersaturation total losses estimation. It shows finding trade-off between size/weight inductor with respect to overall demonstrates their minimization....

The choke flutter can lead to the failure of fan or compressor blade in turbojet engines. Choke appears when a strong shock-wave chokes channel. In UHBR fan, at part speed regimes and low negative incidence. this paper, instability is analyzed based on resolution time-Linearised Reynolds-Averaged Navier-Stokes 2D extraction an Ultra High Bypass Ratio (UHBR) named ECL5v1. An analytical motion ro...

This paper considers an approach to design a fuzzy logic controller to detect incipient abnormal production of wells in a reservoir. The daily operation of an oil and gas production system requires many decisions, which may affect the volumes of oil produced and the cost of production oil. These decisions are taken at different levels in the organization, but eventually they will reach the phys...

Geographical Information System (GIS) is used to assist Sydney Water, a state owned water utility, in their decision-making process to reduce the number of chokes occurring within their jurisdiction. The use of GIS enables Sydney Water to obtain easier visual interpretation of otherwise complicated and detailed raw data. GIS in this sewer choke analysis is found to be useful as it allows the sp...

This paper presents a wideband low-noise amplifier (LNA) designed to be used as the first stage of the receiver in the Square Kilometer Array radio telescope. The LNA design procedure and its layout features are discussed. The noise figure optimization procedure determines the signal-source resistance that results in reduced noise figure. When used in the radio telescope, the required signal-so...