Microbially induced calcite precipitation (MICP) is a sustainable and environmentally friendly technology with applications in soil stabilization, concrete crack repair, wastewater treatment. This study presents an improved Darcy-scale numerical model to simulate the MICP processes heterogeneous porous media. It focuses on effects of porosity heterogeneity, characterized by average correlation length, as well injection strategies. Both length are critical factors influencing mass transport...

This paper analyzes and simulates wind shear tower shadow effects in doubly-fed induction generators, which are known to induce a low-frequency oscillation. Such oscillation is called 3p oscillation, can cause shaft torsion load aggravation torque it inevitably lead electromagnetic power fluctuation the generator further affect whole system. By analyzing two-mass model, be that flexible drive train has low-damping characteristic an amplification of input disturbances. Based on this point,...

At the present stage, China’s energy development has following characteristics: continuous of new technology, expansion comprehensive system scale, and wide application multi-energy coupling technology. Under situation, accurate prediction power load is key to alleviate problem that planning dispatching current more complex demanding than traditional system. Therefore, firstly, this paper designs calculation method demand grid under mode, aiming at important role in This for regional...

Most existing multiprocessor schedulability analysis assumes zero cost for preemptions and migrations. In order those to be correct, execution time estimations are often inflated by a certain (pessimistic) factor, leading severe waste of computing resource. this paper, novel Global Earliest Deadline First (GEDF) test is proposed, where Cache-Related Preemption Delay (CRPD) separately modeled integrated. Specifically, multiple analyses estimating CRPD bounds conducted based on the refined...

Objectives The aim of this study was to identify patient- and treatment-specific independent risk factors for the recurrence proximal fibular tumors complications their surgical management. Methods Patients who underwent treatment at our institution from 2004 2015 were retrospectively reviewed. All patients had a pathologically confirmed diagnosis followed up least 12 months complications. evaluated with respect seven patient-, disease-, variables. Results In univariate analysis, peroneal...

As the number of cores and utilization system are increasing quickly, shared resources like caches interfering tasks' execution behaviors more heavily. In order to achieve resource efficiency in both temporal spatial domains for multi-core real-time systems, should be taken into consideration when performing partitions. this paper, partitioned Earliest Deadline First (EDF) scheduling on a preemptive platform is considered. We propose new model that covers inter-task cache interference...

The second-order generalized integrator frequency-locked loop (SOGI-FLL) is widely used in distributed generation (DG) systems for synchronization. However, constrained by its inherent structure, there exists a conflict between the filtering ability and dynamic performance SOGI-FLL, which not entirely satisfied. As high-end version of third-order (TOGI-FLL) proposed this paper, achieving better faster response. These advantages are validated with frequency domain analyses small signal...

A speed sensorless torque control method for permanent magnet synchronous generator (PMSG) based on super-twisting sliding mode observer (STSMO) is proposed in this paper. Active back electromotive force (BEMF) can be obtained the STSMO. With observed active BEMF, rotor position angle and are estimated by a phase-locked loop. Besides, stator flux electromagnetic (EMT) observation BEMF. Compared to traditional method, robustness of one parameters PMSG improved. Then EMT closed-loop system...

Microbially induced calcite precipitation (MICP) is a promising, more eco-friendly alternative method for landslide prevention and foundation reinforcement. In this study, we investigated the optimization of injection methods within MICP process in porous media to enhance mass consolidation effect. The results demonstrated that staged injections with considerable advantages significantly improved precipitated by 23.55% compared continuous methods. However, extended retention times reduced...

The behavior of soil and clay particles modified with organic cations anions (surfactants) is interest mostly in the context enhanced retentive properties to pollutants. However, adsorption ions on surfaces has other consequences, present article addresses one them, that is, effects preadsorbed interactions between inorganic cations. To characterize this effect we applied previously established method measuring Wien effect, increase electrical conductivity dilute suspensions increasing...

In recent years, As more and attention to wind energy, power technology has become a hot research. This paper take the Doubly-Fed Induction Generator(DFIG) as target for After theoretical analysis of DFIG under harmonic distorted grid voltage conditions, we found current both in stator side rotor will be distorted. And it also make against active reactive output torque too. order eliminate these adverse effects, this proposes control strategy based on proportion-resonant (PR) controller...

Abstract The user-side demand resources of electric vehicles are integrated by load aggregators to respond grid dispatch, which will bring many value-added benefits the and other entities in market. This article analyzes constructs evaluation indicators from two aspects power contribution response rate analyze vehicle operators users. TOPSIS-grey correlation model is established divided into four stages: state determination, reward punishment analysis, peak-valley combination, incentive...

Abstract The development of power demand side resources provides new opportunities and challenges for the advancement energy revolution. Flexible loads such as electric vehicles provide a large number load regulation side, while distributed sources supply side. Reasonable utilization these flexible facilities will be conducive to promoting balance between improving social economic benefits. Considering resource characteristics energy, this paper sets up an optimal scheduling strategy based...

Abstract The high proportion of renewables added to the electricity system and “dual carbon target” require more adjustable resources keep power running smoothly. flexible resource demand side is an important resource, which can help safe reliable operation system. This paper considers way that demand-side participate in load regulation through market, discusses types characteristics resources, analyses trading mechanism participating various markets, puts forward benefit calculation methods...

Abstract With the continuous expansion of scale electric vehicles and development intelligent control technology, it is great significance for to participate in orderly charging discharging improve efficiency ensure safe reliable operation power grid. Firstly, behaviour aggregation model vehicle studied. Then, a two-layer optimal scheduling proposed management system vehicles, which including upper from perspective business operator lower system. Finally, case study on carried out. The...

When grid impedance cannot be ignored, high-frequency harmonic amplification often occurs when Doubly-Fed Induction Generator (DFIG) generation system is connected to a non-ideal with background noise. This paper analyzes the mechanism of DFIG wind power under grid, and quantifies damping through equivalent RLC one-port model. The concept voltage factor proposed guide design virtual resistor for suppression. Based on results, realized by an active damper in parallel at point common coupling...

Abstract With the accelerating process of re-electrification, high-proportion access new energy and rapid development flexible demand-side resources, it is great significance to fully tap explore trading mode market mechanism a wide range load aggregators participating in operation power system. This paper studies path electricity market, which can guide demand-sides resources participate grid regulation, link ‘flexibility value with system’s regulation demand. At same time, uncertainty...

Abstract In order to promote the effective implementation of critical peak pricing (CPP) mechanism, it is necessary study dynamic adjustment method periods. this paper, a periods based on FCM algorithm proposed. First, day month selected according load. Then algorithm, are redivided into and Finally, effectiveness verified by numerical example.

Abstract Under the background of “carbon neutrality” and peak” targets, how to break inter-provincial barriers promote a wider range clean energy consumption has become an urgent problem. This paper improves traditional clearing model by introducing correction coefficient differences carbon emission reduction. The results show that improved can in provinces. And it better saving reduction effect.

With the introduction of "Internet +" series policies, development energy Internet has reached a new climax.Based on research domestic and foreign literatures Internet, this paper introduces Energy benefit assessment model in combination with Internet.Based status quo, contacting theory practice, using calculation method theoretical results, combined trend, basis qualitative quantitative analysis, establish comprehensive evaluation system operation strategy.Based characteristics policies...