【摘 要】
：
A uniaxial load experiment on coal rocks at different stress rates was carried out, based on the characteristics of acoustic emission (AE) signals in cracking c
【机 构】
：
School of Information and Electrical Engineering
论文部分内容阅读
A uniaxial load experiment on coal rocks at different stress rates was carried out, based on the characteristics of acoustic emission (AE) signals in cracking coal rocks, decomposition, de-noising and reconstruction for the AE signals through wavelet packet transform for solving the current problems created by the presence of noise in AE signals and the existing problems in AE signal processing. The results show that the various characteristics of AE signals in coal rocks cracking under different situations can be clearly reflected, after the AE signals are de-noised by the wavelet packet. Compared to dry coal rocks, the number of AE occurrences in damp coal rocks was significantly reduced, as well as the average amplitude. The number of AE occurrences in damp and dry coal rocks clearly increased with increases in the loading rate, but the largest amplitude of the AE signals in damp coal rocks has been reduced. There is no clear evidence of change in dry coal rocks.
其他文献
As the number and geometric intensity of visual satellites are susceptible to large slopes in open-pit mines, we propose integration of GPS/Pseudolites (PLs) po
通过对隔水层土样实验,获得了离石黄土和三趾马红土的应力应变全程曲线、渗透系数和膨胀率.基于考虑黏土应力应变全程相似和水理性相似的固液耦合相似模拟,揭示了浅埋煤层长
Let M be a closed n-manifold of positive sectional curvature.Assume that M admits an effective isometrical T~1 × Z_p~k-action with p prime.The main result of t
Differential proteins expressing in ectopic and eutopic endometria were investigated by means of proteomic analysis.Five patients in secretary phase were diagno
Let D_n be the generalized unit disk of degree n. In this paper, Riemannian metrics on the Siegel-Jacobi disk D_n× C~(m,n) which are invariant under the natura
An improved phase averaging method based on cross-correlation of the instantaneous velocity field determined by TR-PIV measurements is proposed in this article.
Six new polyesters 7a-f were synthesized through the solution polycondensation reaction of diacid chloride 5 with six aromatic diols 6a-f in N,N-dimethyl acetam
Reaction of bis(4,6-dimethyl-2-pyrimidinethiolato)methane(bpytm)with CuCl_2·4H_2O in a mixed methanol/dichloromethane solution gave a one-dimensional coordina-
Treatment of resorcin[4]arene tetracarboxylic acid 1 with triethylamine in the presence of Co(CH_3COO)_2·4H_2O and 4,4-bipyridine gave a co-crystallization 1~(
Ionic liquids(ILs)have been regarded as the potential novel solvents for improved analytical-and process-scale separation methods.The development of methods for