Multi-stage, multi-cluster fracturing in horizontal wells is widely used as one of the most effective methods for unconventional reservoir transformation. This study based on extended finite element method and establishes a multi-hydraulic propagation model that couples rock damage, stress, fluid flow, influence stress difference cluster spacing fracture quantitatively analyzed. The simulation ...

Since metros are high capacity, fast and large in size compared to other urban rail vehicles, the importance of body strength is very critical. In this study, a four-car metro system was designed structural analyses vehicle were carried out using finite element method according EN 12663-1 standard. Structural performed under three different conditions. total mass 22.7 m long with all its equipm...

At present, the mechanical properties analysis method of prefabricated shear wall structure based on static test is low overall simulation precision. In this paper, finite element used to analyze force performance structure. Based concrete material, elastic modulus, Poisson ratio, open fracture, transfer coefficients and closed tensile strength parameters, model established by ANSYS. The vertic...

to evaluate the effect of arbuscular mycorrhizal fungi under water deficit stress on linseed, a field experiment was conducted as split-plot in rcbd design with three replications at the research station of faculty of agriculture at shahrekord university in 2013. water deficit stress at four levels of no stress, mild, medium and severe stress as main factor and inoculation with glomus intraradi...

In order to investigate the characteristics of elliptical ultrasonic vibration cutting TiC particle-reinforced titanium matrix composites, a two-dimensional thermodynamic coupled finite element model was established based on Johnson-Cook intrinsic structure using ABAQUS simulation software, and changes in force, temperature, machined surface shape, particle fragmentation were obtained under tra...

We generalize the wavelet transform modulus maxima approach in order to analyze positive and negative changes separately and show different singularity spectra depending on the direction of changes in (i) human heartbeat interval data during sympathetic blockade, (ii) time series of daytime human physical activity of healthy individuals (but not of patients with debilitating fatigue), and (iii)...

We explore a model of stress prediction in Russian using a combination of local contextual features and linguisticallymotivated features associated with the word’s stem and suffix. We frame this as a ranking problem, where the objective is to rank the pronunciation with the correct stress above those with incorrect stress. We train our models using a simple Maximum Entropy ranking framework all...

A geostress field continuously evolves with long-term tectonic activity. fault, as a general product of movements, has great influence on the in vicinity. To analyze characteristics and influencing factors near fault fracture zone high-altitude areas, this study takes Dianda-Piru Qinghai–Tibet Plateau its research object. Based geological conditions situ stress measurement data area, refined nu...