A novel fault section location method based on characteristic frequency sequence determined by multiple combinations for distribution network is proposed. This method S-tranforms the transient ...zero-mode current components of every detection point on a whole line, and selects the characteristic frequency sequence based on the corresponding frequency point of its maximum transient energy. On the above basis, taking the whole line as a system, it calculates the relative entropy values of any two adjacent detection points of transient zero-mode current. Finally, it compares the calculated entropy values. After all the combinations are compared, the section with the highest number of "possible fault section" judgement will be judged as fault section. By adopting relative entropy value to measure the difference of waveforms, characteristic effect can be obviously presented and multiple combinations method can improve the credibility of fault location results.
As the renewable energies become more and more popular due to the conflicts between economic development and environment, not only the utilities but also the residential consumers start to think ...about installing alternate and renewable generations. For residential use, the renewable energy sources can provide alternate energy resource in case of outages as well as save the utility bills. This paper is to provide suggestions for residential installation of renewable and alternate energy based on technical and commercial feasibility analysis and give the recommendations on installing wind energy, PV system and energy saving tips.
To investigate the isotopic effects and their influence on the stereodynamical properties of the N( super(4))+H sub(2) reaction system, quasi-classical trajectory (QCT) calculations are carried out ...on the super(4)A" double many-body expansion (DMBE) potential energy surface (PES) Phys. Chem. Chem. Phys. 7 (2005) 2867 at a collision energy of 40 kcal/mol. The generalized polarization-dependent differential cross sections (PDDCSs) and the three angular distributions of P(theta sub(r)), P(phi sub(r)) and P(theta sub(r), phi sub(r)) are presented and discussed for the title reaction and its isotope variants. It is revealed that both intermolecular and intramolecular isotope effects can exert a substantial influence on the product polarizations.
The concept of smart home is gaining in popularity. A new interactive terminal applied to smart home basing on Z-Wave is given. The interactive terminal includes control module, source module, level ...shift module, display module, Z-Wave communication module and peripheral circuit module, etc. The Z-Wave communication module is connected with control module in two-way mode, and communicates with smart meter, smart socket and intelligent switch. Also, Z-Wave communication module receives the tariff information from grid. Peripheral circuit module is connected with control module in single-way mode, and provides control module with clock information and protection. The installation of the terminal is simple and convenient. The terminal can be split easily, and also has the strong anti-interference ability.
It proposed a novel method of fault section location which utilized the pure fault component when fault occur. Based on the calculation of approximate entropy value of transient zero-mode power for ...both all detection points, it got the scale factor value of every section, then according to the comparison the value to threshold in the main station, and determined the fault location. A large number of ATP simulation showed that both the bus fault and the branch line fault can determined the fault point accurately. Besides, because the fault location method of approximate entropy algorithm needed not the accurate synchronize time of every detection points, it is fit for the actual fault location system.
The cloud signals can cause severe wobble of tropospheric ozone concentration in the process of differential absorption lidar measurement of ozone concentration, and bring significant errors. A cloud ...elimination algorithm is presented. The algorithm effectively eliminate tropospheric ozone wobble by interpolating the ozone concentration in cloud height region. The key point of the cloud algorithm is given through expounding its theoretical basis. The key point of the cloud elimination is the discrimination of cloud signal and accurate positioning of the cloud height. The cloud height information is determined by setting the aerosol extinction coefficient threshold according to the characteristics of the cloud extinction coefficient. The cumulative average of retrieved ozone concentration reduces measurement errors caused by noise. The results show that the correction by interpolation algorithm of ozone measurements in cloud region could overcome the wobble of the ozone measurements caused by clouds.
The knowledge graph (KG) that represents structural relations among entities has become an increasingly important research field for knowledge-driven artificial intelligence. In this survey, a ...comprehensive review of KG and KG reasoning is provided. It introduces an overview of KGs, including representation, storage, and essential technologies. Specifically, it summarizes several types of knowledge reasoning approaches, including logic rules-based, representation-based, and neural network-based methods. Moreover, this paper analyzes the representation methods of knowledge hypergraphs. To effectively model hyper-relational data and improve the performance of knowledge reasoning, a three-layer knowledge hypergraph model is proposed. Finally, it analyzes the advantages of three-layer knowledge hypergraphs through reasoning and update algorithms which could facilitate future research.
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GEOZS, IJS, IMTLJ, KILJ, KISLJ, NLZOH, NUK, OILJ, PNG, SAZU, SBCE, SBJE, UILJ, UL, UM, UPCLJ, UPUK, ZAGLJ, ZRSKP
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