Rock mass often exhibits anisotropic properties. Even isotropic rocks will behave anisotropically if cut by regular joint sets. Many rock masses can be regarded as orthogonal linear elastic bodies. To date, there is no analytic method available to determine the stresses in an arbitrary-shaped tunnel (except for elliptic holes and circles) under action of situ stresses. obtain analytical solutions, conformal transformation used, which with three polar coordinates are introduced. By...

The phase stability and mechanical properties of binary W1−xTax W1−xRex alloys were investigated using the full-potential augmented plane-wave method. special quasirandom structures(SQSs) these are mechanically stable due to all positive elastic constants negative binding energies. energies both also exhibit energy favorable asymmetry toward W-rich side. In addition, bulk modulus decrease gradually with increase Ta concentration, while those Re concentration. Consequently, W metal can be...

The capacitive micro-machined ultrasonic transducer (CMUT) has a good acoustic matching with air. In this paper, 16-element CMUT array for airborne application is designed and fabricated by SOI wafer bonding process. All the cells have same geometric parameters circular sealed membrane, which vibrate uniformly transmission efficiency. And thin membrane small mass proposed to broaden bandwidth of CMUT. sensor operates at 215.6 kHz resonance frequency large -3dB fractional 15.7% consistency....

It is a considerable challenge to develop mathematical method for modelling the coupling relationship between control signal and braking performance in design optimization, especially with highly nonlinear system. The present study thus establishes an integrated CFD-aided method, elaborately proposed based on 1D/3D co-simulation accomplish goal of collaborative calculation multi-physics fields, conducting thermal properties that changes dynamically signal. In particular, 3D model actually...

Ptassium dihydrogen phosphate (KDP) crystals are used as key components in high power density solid-state laser for Inertial Confinement Fusion. Surface quality is an important factor KDP implemented lasers. At present Single Point Diamond Turning(SPDT) the only way to get required transmitted wavefront and damage threshold KDP. The paper introduces something about defects of fabricating analyses some reasons. Based on analysis reasons, process parameters can be adjusted meet critical...

A steel tube–reinforced concrete (ST-RC) column is composed of the inner concrete-filled tube (CFST) component and peripheral reinforced (RC) component. In this study, confinement interaction mechanism axially loaded columns was evaluated experimentally analytically. Eleven specimens were tested, including five ST-RC, three CFST, RC columns. The test results found that between core CFST outer components integrates both advantages while remarkably altering section equilibrium compared with...

Real-time and accurate short-term traffic flow prediction is a key issue difficult in control guidance.Using data mining large data-driven principle, nonparametric regression better method to resolve shortterm prediction.But there are two main obstacles that case base be generated search slow.For this reason, paper presents based on balanced binary tree K-NEAREST NEIGHBOR NONPARAMETRIC REGRESSION (KNN2NPR).Case through clustering balance structure.K-nearest neighbor improves accuracy of...

To investigate the cause of mandibular implant loss, we evaluated stress distribution in bone under bite force when miniimplant was near root using three-dimensional finite element analysis. Our analysis involved four models with different distances between and adjacent tooth three loading conditions. With only or both implant, peak within around neck, displacement, surrounding increased as distance decreased. However, separate did not correlate root. Application increases bones...

Studying complex pore structures and fractal characteristics of gas shale provides significant guidance for clarifying the mechanism accumulation realizing its efficient development. In this paper, 12 samples Taiyuan Formation are used as research object, theory is combined with mercury intrusion porosimetry N 2 adsorption technology to innovatively solve problem splicing point selection, which can reveal full-scale size distribution shale. The results demonstrate that most common types...

Abstract Due to its applications in signal analysis and image processing, the quaternionic Fourier has received increasing attention. In particular, Gabor frames (QGFs) attracted some mathematicians’ interest. From literatures, results on QGFs are based orthonormal bases. But those used so-called bases have a gap that they all incomplete. this paper, we present class of bases, using them derive corresponding

Traffic congestion is a severe problem in many modern cities around the world. The non-recurring occurrence of incident-induced sometimes may cause large-scale traffic congestion. This paper proposes an intelligent-based prediction system, Fuzzy-Neural Network Prediction System (FNNPS), as decision support to operators. Fuzzy algorithm used FNNPS handle different sources heterogeneous input data including static structure variables road network, real-time flow information (i.e. average...

Abstract As the core equipment of power grid, relay protection device plays a key role in safe and stable operation grid. It has become development strategy State Grid Corporation China to research develop high-performance high reliability domestic chips carry out localization components protection. This paper analyzes hardware structure device, studies performance index parameters device; combined with environment influencing factors such as temperature, humidity, electromagnetic...

Impact sensitivity of solid high explosives, an important index in evaluating the safety and performance is concern handling, storage, shipping procedures. It a great threat for either bare dynamite or shell charge when subjected to low velocity impact involved traffic accidents piece drops. The Steven test effective tool study relative various explosives. In this paper, we built numerical simulation method involving mechanical, thermo chemical properties based on thermo-mechanical coupled...

Concrete structures in service are exposed to the combined effect of load and environment. This paper determines free chloride ion content diffusion coefficient polyurea coated mortar specimens while to: co-action dry-wet cycle NaCl solution immersion, bending immersion coupling load, immersion. Furthermore, scanning electronic microscopy (SEM) is applied observe micro-morphology interface between substrate coating. The results show that, after 90 days cycles, at 6mm depth amounts 0.0153%,...