Summary Recent reports have demonstrated that carbon dioxide (CO2) injection can further raise the oil recovery of fractured tight reservoirs after natural depletion, with major projects in progress worldwide. There is, however, a lack understanding mass-exchange process between matrix and fracture at pore scale. In this study, (0.8 md)/fracture model was designed to experimentally simulate CO2-cyclic-injection 80°C 35 MPa (Lucaogou formation). The (dead-oil) concentration continuously...

Surface electromyography (sEMG) is a promising technology that can capture muscle activation signals to control robots through novel human–machine interfaces (HMIs). This has already been applied in scenarios such as prosthetic design, assisted robot control, and rehabilitation training. article provides an overview of sEMG-based covering two important aspects: (1) sEMG signal processing classification methods (2) strategies based on sEMG. First, the outlines general steps summarizes...

sEMG is a non-invasive biomedical engineering technique that can detect and record electrical signals generated by muscles, reflecting both motor intentions the degree of muscle contraction. This study aims to classify recognize nine types upper limb based on surface electromyography (sEMG) apply them interactive control an end-effector rehabilitation robot. The research begins with selecting muscles data preprocessing, incorporating generation mechanism along anatomical kinesiological...

Green spaces in waterfront residential blocks, where the water landscape and green space intersect, have a special carbon sequestration effect due to distinct ecological interaction between bodies spaces. Studying efficiency of patterns is crucial for enhancing urban quality. Herein, 100 blocks adjacent Shanghai were selected as case areas, pattern classification, random forest algorithm spatial configuration quantitative analysis used analyse impact morphology factors, surrounding building...

Through introducing a generalized optimal speed function to consider spatial position, slope grade and variable safe headway, the effect of in single-lane highway on traffic flow is investigated with extended model. The theoretical analysis simulation results show that flux whole road upgrade (or downgrade) increases linearly density, saturates at critical then maintains this saturated value certain density range finally decreases density. equal maximum without considering slight influence...

To address the fast productivity decline of horizontal wells and low oil recovery during natural depletion in Baikouquan formation, approach solution gas re-injection was proposed with primary objective further developing this formation. Herein, a field-scale numerical compositional reservoir model built up based on formation properties then effects permeability, fractures stress production dynamics were thoroughly investigated. A sensitivity analysis, which can correlate these parameters,...

This paper proposes a modified lattice gas model to simulate pedestrian counter flow by considering the effect of following strength which can lead appropriate responses some complicated situations. Periodic and open boundary conditions are adopted respectively. The simulation results show that presented reproduce essential features flows, e.g., lane formation segregation effect. fundamental diagrams complete jamming density is independent system size only when width W length L larger than...

A method is presented for tip-over stability analysis of a wheeled mobile manipulator. manipulator may tip over resulting from its operation. In this study, first Newton–Euler formulation applied to formulate the manipulator’s reaction forces and moments exerted onto platform. Tip-over criterion derived judge system stability. Three load motion analyses are carried on. The static deals with links payload show effect horizontal position system’s center gravity (CG). second third inertial...

Robot positioning accuracy plays an important role in industrial automation applications. In this paper, a method is proposed for the improvement of robot with optical tracking system that integrates least-square numerical algorithm identification kinematic parameters. process establishing kinematics model, errors tool and base, Denavit-Hartenberg parameters are all considered. addition, linear dependence among analyzed. Numerical simulation based on 6-axis UR performed to validate...

Trajectory planning and avoidance of tipping are the main keys to success in mobile dual-arm manipulation, especially when or moving platform is running fast. The forces moments between wheel-terrain body-arm have been analyzed by kinematics force analysis a robot define tip-over stability constraint. Then, an improved moment criterion for wheeled presented defines constraint based on it. To improve motion robot, this paper presents optimal joint trajectory model time energy. quintic...

We propose an extended lattice gas model with different maximum velocities to simulate pedestrian counter flow by considering the subconscious behaviour of walkers. Four types walkers including faster right walkers, slower left and are involved in simulation. The simulation results show that our can capture some essential features flows, such as lane formation, segregation effect phase separation at higher densities. also find reduce occurrence jam cluster evidently compared case...

Accelerating mass exchange between matrix and fractures is the essence of enhanced oil recovery (EOR) in tight formations after natural depletion. Low salinity water (LSW) injection has been commercially-proven conventional reservoirs EOR, with scale projects progress worldwide. There is, however, a lack understanding EOR effect formations. Therefore, this work, we introduced LSW-EOR to target formation using huff-puff mode. Spontaneous imbibition (SI) tests were firstly performed on...

A method for optimizing a mobile platform to form wheeled manipulator is presented. For given manipulator, this optimized have maximum tip-over stability against the reaction forces and moments caused by movement of manipulator. This optimization formulated as max–min problem, i.e., maximize stable region ratio (SRR) over manipulator's workspace while minimizing moment (TOM). practical solution, problem converted two subproblems. The first one worst-case analysis determine positive value TOM...

Evacuation time taken by people to escape out of a room with obstacle is investigated using small-grid lattice gas model different maximum velocities. The relationship between the evacuation and size distance exit investigated. simulation results show that decreases when set appropriately under various densities. Additionally, numbers pedestrians escaping without at each step are also compared discussed in detail.

A method is presented for slip analysis of a wheeled mobile manipulator. The said system consists an industrial manipulator mounted on platform performing aircraft manufacturing tasks. Unlike tracked/legged robots that may when negotiating slopes or climbing stairs, resulting from the movement forces end-effector during fastening. Slip crucial to ensure pose accuracy operation. In this study, first universal friction constraint used derive condition system. Three cases are considered, with...

Pedestrian behavioral modeling is an important topic to reproduce rich pedestrian dynamics phenomena. In this paper, a modified lattice gas model proposed simulate counter flow under periodic boundary conditions by considering the variable transition probability, which can quantitatively describe complex human subconscious behaviors and distinguish individual common characteristics of pedestrians. Four types walkers are involved in model, their dynamical discussed some situations. The...

The CO2 sequestration capacity evaluation of reservoirs is a critical procedure for carbon capture, utilization, and storage (CCUS) techniques. However, calculating the amount flooding in low-permeability challenging. Herein, method combining numerical simulation technology with artificial intelligence proposed. Based on typical geological fluid characteristics oil Liaohe oilfield, CMG 2020 version software GEM module used to establish model sequestration. Meanwhile, calculation effective...

From the macroscopic viewpoint for describing acceleration behaviour of drivers, a weighted probabilistic cellular automaton model (the WP model, short) is proposed by introducing kind random distribution function. The fundamental diagrams, spatiotemporal patterns, are analysed in detail. It shown that presented leads to results consistent with empirical data rather well, nonlinear flow–density relationship existing lower density regions, and new traffic phenomenon called neo-synchronized...

Through analysis of the connotation unconventional hydrocarbons, source-reservoir assemblages hydrocarbons are divided into three types, i.e., neighboring type, integration and separation type. The type resources mainly include tight oil gas with following formation conditions characteristics: (1) efficient near-source accumulation close to high-quality source rocks pressure difference between reservoir as dynamic force; (2) large-area reservoirs certain porosity, dominated by...

Micro-fractures are developed in volcanic layers of Cretaceous Yingcheng Fm the deep part Xujiaweizi fault depression, Songliao Basin. In process well drilling, various complex problems happen, such as borehole wall slabbing and collapse serious fluid leakage. Based on conventional drilling plugging evaluation methods, real situations cannot be presented accurately, especially fracture feature simulation effect evaluation. Therefore, a specific micro-fracture method was put forward for...