Polyurethane has been widely used as new chemical grouting material. Expansion characteristics caused by reactions make polymer grout different from other types of grout. To throw light on the diffusion process in a fracture, density model was derived fitting experimental data based polymerization mechanism polyurethane. In addition, numerical simulation single fracture developed to predict pressure distribution. An experiment carried out analyze distance and field under masses. Comparison...

Curcumin is a key polyphenolic curcuminoid extracted from the root of turmeric rhizome Curcuma longa Linn, which frequently used Chinese herb for treatment cancer. The aim present study was to investigate mechanism inhibitory effects curcumin on nude mice with lung cancer A549 cell subsets side population (SP) and non-SP (NSP) cells. BALB/c were subcutaneously injected tumor cells SP or NSP consisting 1×109 cells/l (0.2 ml in total). After 16 days inoculation A549, intraperitoneally (100...

To improve the service life of a semirigid base asphalt pavement and prolong its cycle, it is imperative to conduct long‐term performance research before after disease repair. This study proposes fatigue damage model for polymer materials uses finite element method establish three‐dimensional numerical structure. Moreover, compares analyzes mechanical response this The evolution law verified by indoor tests. results show that, under standard load 0.7 MPa, vertical displacement Mises stress...

Different formulations of foaming polyurethane grout offer controlled expansion rates. This is crucial for precision in filling voids without exerting excessive pressure on surrounding structures, which could potentially cause damage. study focuses the impact composition performance tailor-made grouting materials. Initially, multiple unknown chemical reaction kinetic parameters were identified by combining free tests, involved measuring density and temperature changes, with particle swarm...

To achieve a hierarchical and quantitative evaluation of grid-wide power quality in the distribution network, reflecting overall level comprehensive method for system based on complex network theory is proposed. Firstly, propagation characteristics disturbances, index constructed. Secondly, to reflect constraint effect local nodes system, corresponding indices such as improved node degree, electrical betweenness, self-healing capability are proposed theory, influence degree calculated. Then,...

Polyurethane grouting can be used for antiseepage and reinforcement in underground construction. Understanding the diffusion characteristics of polyurethane grout is critical good design. However, influence water pressure on not clear. The aim this work to experimentally investigate behavior a water-bearing fracture. A series laboratory experiments was conducted using self-designed visual fracture device under different conditions. influences quantity distance flow field are discussed....

Polyurethane grouting materials, a type of expansible grout, has played significant role in the rehabilitation public infrastructures, such as lifting slab road and reinforcing broken wall rocks tunnel. Due to unique expansion characteristic polyurethane materials induced by chemical reaction, its diffusion mechanism rock fracture is rather complicated. Based on numerical method presented previous paper, law grout single studied considering time-varying density viscosity tested experiments....

The rapid detection of asphalt content in mixture is great significance to the quality evaluation pavement. Based on dielectric properties an mixture, prediction model deduced theoretically using three types models: Lichtenecker‐Rother (L‐R) model, Rayleigh and Bottcher equation. Under condition laboratory mixing at room temperature (about 20–25°C), a test conducted verify applicability model. results indicate that constant inversely proportional directly aggregate size mixture. Among...

This study aims to address the problem that loose damage of pavement base course cannot currently be quantitatively identified, and thus classification recognition extent looseness mainly rely on empirical judgments. Based finite‐difference time‐domain (FDTD) method, a backpropagation (BP) neural network identification method for semirigid is presented. The FDTD used simulate road model numerically with different degrees looseness, eigenvalue parameters presence layer are obtained. Then, BP...

Low exothermic polyurethane grouting material, as a new type of is used for road reinforcement and repair engineering in frozen earth areas. This study investigates the mechanical properties this material under different ambient temperatures. The effects temperature density on expansion pressure, compressive strength, tensile strength materials were determined study. characteristics material's stress–strain curves analyzed microscopically. results demonstrate that significantly influenced...

This paper is aimed to solve the overlearning problem of neural network algorithm used calculate asphalt concrete pavement structural modulus in reverse. The firefly was adapted optimize selection support vector machine (SVM) parameters. Based on optimized SVM model, a new method for dynamic inversion semirigid base layer presented. results show that absolute value relative error each not more than 3.73% by using proposed method. Then, influences temperature and humidity seasonal frozen area...

The purpose of the present work is to develop a quasi‐3D numerical method that can be used study diffusion mechanism grout injection in rock fracture based on collocated structured grid finite volume (FVM). Considering characteristics geometry aperture much less than its length and width, Hele‐Shaw model introduced deduce z- derivatives velocities u v at walls, which function relevant average velocity aperture. traditional difference scheme for diffusive term partly substituted with derived...

This paper aims to present a solubility model of physical blowing agent (PBA) for kind commonly used self-expanding polymer on engineering. The contains Component A (isocyanate) and B (polyhydric alcohol, PBA, water, catalyst). grout the polymer, which was heated measure its temperature volume variations. Based principle mass conservation Clapeyron equation, curve PBA with respect calculated. then applied simulate foaming process. two-component experiment carried out verify applicability...

Optimizing the operation of photovoltaic (PV) storage systems is crucial for meeting load demands parks while minimizing curtailment and enhancing economic efficiency. This paper proposes a multi-scenario collaborative optimization strategy PV based on master-slave game model. Three types energy system (ESS) application scenarios are designed to comprehensively stabilize fluctuations, compensate transfers, participate in frequency regulation (FR) market, thereby optimizing overall...

High-penetration photovoltaic (PV) integration into a distribution network can cause serious voltage overruns. This study proposes hierarchical control method based on active and reactive power coordination to enhance the regional autonomy of an improve sustainability new energy consumption. First, considering margin spatiotemporal characteristics distributed photovoltaics, modularity function is proposed divide grid regions. Voltage region types their weak points are then defined,...

Expandable polyurethane grout has been extensively utilized for the reinforcement and sealing of rock fractures. The diffusion mechanism this is particularly unique, owing to time-dependent characteristics both its density viscosity. However, non-synchronous relationship between change in radius pressure poses challenges deriving analytical solutions. In light this, our study presents an innovative model effectively simulate behavior expandable within Notably, considers self-expanding source...

The use of the falling weight deflectometer (FWD) for detecting pavement voids is based on principle that, under same impact load, deflection pavements with increases significantly. Under effect temperature, cement becomes warped, which affects detection accuracy. In order to improve accuracy FWD voids, a three‐dimensional numerical model multilayered elastic foundation coupled action temperature and load established in this paper. addition, different void, climatic, conditions, influence...

A real-time evaluation of network loss and an auxiliary decision-making method for energy saving consumption reduction based on power market is proposed. The on-line calculation sub-line, sub-circuit, sub-voltage sub-zone in each province realized. Power flow method, root mean square collection, state estimation, multi-dimensional integration are used to verify. By analyzing the structure, change structure operation mode tracked real time, information data collection nodes system matched...