Persistent data packet losses induced by consecutive denial-of-service (DoS) attacks could fail traditional state estimation (SE) algorithms that highly rely on the completeness of dataset. To solve problem, this article explores a novel SE algorithm with enhanced accuracy for power systems against DoS attacks. First, according to characteristics attacks, we design strategy using latest received measurement compensate losses, and reconstruct system model. Second, integrating Holt's...

Secure information exchange of the devices among different domains for cyber-physical power systems (CPPSs) is important yet challenging. Conventional blockchain-based authentication schemes generally adopt single blockchain and signature algorithm, only achieving intradomain or interdomain with lower efficiency, always failing to meet confidentiality requirement during interaction in CPPSs. To address these issues, this paper proposes a cross-domain scheme based on distributed two-layer...

Abstract The increasing depth of mine excavation presents greater challenges in ventilation and managing cooling energy consumption. Therefore, there is an urgent need for comprehensive research on jet influenced by low-speed crossflows. This study investigated the impact flow velocity ratios ( R ) exit diameters d flow-field distribution characteristics through measurements smoke visualization experiments. results revealed two distinct types air lakes formed crossflow (JVIC), with one being...

The technology of dynamic Wireless Power Transfer (WPT) has a broad application prospect in Electrical Vehicle (EV). Recently, the DD type been proposed as EV's charging magnetic coupler design, which already shown to have best performance stationary charging. For wireless charging, output power fluctuates when EV moves. This paper seeks optimize realize all WPT system's demands. A crossed coil design is solve "almost zero mutual inductance phenomenon" moves from one primary next this paper....

Electrohydrodynamic (EHD) conduction pumping technology offers an innovative way to control flow distribution in multiscale environments. In EHD conduction, the interaction between a strong electric field and dissociated electrolyte species dielectric fluid generates net body force therefore flow. pumps have simple designs with no moving parts, low power consumption, ability operate microgravity. These perform better at smaller scales been shown be effective for heat transfer enhancement,...

Wireless power transfer (WPT) technology has drawn much attention due to its advantages such as safety, convenience, and non-contact. For some movable devices intelligent inspection robot, the constant output voltage is very important ensure normal operation. In order improve system efficiency steadiness of voltage, a maximum tracking charging method proposed for dynamic WPT system. this method, mutual inductance optimal input can be estimated accurately no matter coupling coefficient...

The signcryption schemes play an important role in keeping the security of information interactions among devices cyber-physical power systems (CPPSs). However, existing based on bilinear pairing have heavy computation and communication costs, making it challenging to deploy resource-constrained (RCDs). Moreover, most aggregate do not validate ciphertext when data are aggregated by aggregation device, jeopardizing stability CPPSs. To solve these issues, this article explores a novel...

The existing identity security schemes (e.g., based on bilinear pairing) have high computational complexity and large bytes of variables, which results in computation communication costs. It is difficult to apply the resource-constrained (i.e., communication) devices. Moreover, most these adopt a fixed cycle key update strategy compromising authentication or dynamic (real-time) with cost. To solve issues, this article explores novel revocable lightweight scheme for devices cyber–physical...

Enhancing the total factor productivity in forestry is an important part of deepening reform collective forest rights system. Based on survey data 295 plots 12 towns Liuyang City, Hunan Province, China, study utilized a three-stage DEA model to assess at plot level. The empirical employs Tobit and fractional regression models investigate effects differences subsidies regulatory policies heterogeneous different types forests. found that: (1) mean value plot-scale 0.127, there are obvious...

Summary The superheated steam temperature system of the thermal power plant has characteristics large inertia, nonlinearity, and strong time variation, which make it difficult to be controlled. To address these problems, this paper proposes a generalized predictive control algorithm with an adaptive forgetting factor. First, based on fuzzy recursive least squares algorithm, controlled object's model can quickly accurately obtained factor in real time. It overcomes nonlinear time‐varying...

This study provides an integrated interpretation for the Mesozoic ‐ Cenozoic tectonothermal evolutionary history of Permian strata in Qishan area southwestern Weibei Uplift, Ordos Basin. Apatite fission‐track and apatite/zircon (U‐Th)/He thermochronometry, bitumen reflectance, thermal conductivity rocks, paleotemperature recovery, basin modeling were used to restore Meso‐Cenozoic Strata. The Triassic AFT data have a pooled age ∼180±7 Ma with one peak P(χ 2 )=86%. average value corrected...

To improve the thermal health state of workers in mines facing heat hazards and enhance cooling capacity utilization efficiency mine ventilation, this study proposes a suitable air distribution for workers' local cooling, taking into account characteristics long-narrow underground space workers. The suggested involves harnessing cold jets along with mine's crossflow (mainstream ventilation) to create localized safeguard airflow around worker's head-neck, known as jet ventilation (JVIC). flow...

In order to solve the problem of tension control in actual unwinding process lithium battery diaphragm slitting machine, dynamic model and machine system is constructed this paper based on deformation during sampling period, view nonlinear characteristics unstable caused by uncertain interference inaccurate process. Considering multi-output strong coupling between outputs, a multi-variable comprehensive sliding surface for balancing speed, mode controller controlling are designed. And...

The misalignment of the resonant coils in wireless power transfer (WPT) systems causes a sharp decrease efficiency. This paper presents method which improves tolerance WPT systems. Based on electromagnetic simulations, structural unit parameters material were extracted, and an experimental prototype four-coil system was built. influence metamaterials under conditions lateral angular offset investigated. Experiments showed that efficiency could be maintained above 45% when distance with 1 m...

The class imbalance of samples network traffic will cause the poor classification performance intrusion detection models based on machine learning. To solve this problem, paper researches sampling algorithm and deep learning for in imbalanced traffic. This proposes a recurrent neural (delayed long short-term memory (DLSTM)) model balanced samples. First, an improved hybrid (IHS) method chaotic particle swarm optimization (CPSO) is proposed as to balance Next, DLSTM with (LSTM) function...

A wireless power transfer (WPT) system can bring convenience to human life, while a leakage magnetic field around the be harmful humans or environment. Due application limitations of aluminum and ferrite materials, it is urgent find new type shielding material. This paper first proposes detailed model analysis method matrix metamaterial (MSM), which applied low-frequency WPT in an electric vehicle (EV). The MSM placed on top side EV shield from all positions. To explore its function,...

Power distribution system installed with D-STATCOM (Distribution Static Synchronous Compensator) is a large-scale nonlinear, multivariable system. The traditional PI controller not content to modern control requirement because of its fixation parameters. In this paper, node voltage strategy based on self-adaptive neural network proposed, and the structure designed. dynamic process, parameters are on-line adjusted networks. Thus, good at robustness adaptability. simulation model built in...

This paper proposes a wireless power transfer (WPT) system with dual transmitting coils and receiving based on pair of bilayer quadrature double-D (BQDD) coil for charging an electric vehicle (EV). And presents parameter design method the system. The magnetic coupler composed BQDD has following characteristics: 1) Mutual decoupling between coils; 2) It can be applied to WPT improve capacity; 3) High density. Firstly, circuit model transmitters receivers is established double-sided LCC...

The three-state Markov equation is built considering run, outage and derating state of wind turbine. turbine reliability probability assessment has made using Monte Carlo method the randomness speed failure rate itself. simulation based on 1.5MW made; result verified effectiveness adaptability proposed model method.

Electrohydrodynamic (EHD) conduction pumping technology offers an innovative way to control flow distribution in multi-scale environments. In EHD conduction, the interaction between a strong electrical field and dissociated electrolyte species generates net body force therefore dielectric fluid. pumps have simple designs with no moving parts, low power consumption, ability operate microgravity. These perform better at smaller scales been proven effective for heat transfer enhancement,...

Power system installed with SSSC is a large-scale nonlinear, indeterminist, multivariable system, and the traditional PI controller has limited application in some cases because of its non-adaptive parameters. In this paper, new control strategy based on self-adaptive algorithm neural network proposed for power flow systems. controller, an identification modeled to analyze dynamics systems, self-tuning parameters employed obtain optimal using training presented paper. With perfectly dynamic...

As to the nonlinear and time-varying problems of energy consumption model, this paper proposes an adaptive hybrid modeling method. Firstly, recursive least squares algorithm with forgetting factor based on fuzzy is used identify simplified mechanism which solves data saturation phenomenon weights “old new” during online identification process guarantees adaptability model. Secondly, because there a deviation between identified model compensation established through kernel partial updating...

Because of wind speed with the randomness and non-stationary properties, power has a great effect when it integrates to grid. We can only prediction more accurate reduce its harmful However, is difficult make accurately forecast because characteristics. This article we discuss method that processed by wavelet at first, then giving different quantile points each layer decomposition using regression, finally gain differential reconstruction every layers predict. The result shows this better...