Aiming at the gas over-run problem in upper corner of “U-type ventilation” end-mining working face multi-source goaf #15 coal seam Phoenix Mountain Mine, site survey and numerical simulation methods were adopted, which showed that maximum caving zone height is 14.87 m, fissure 51.63 m. On this basis, control scheme “U+ omni-directional large-diameter high-level borehole along roof strike” was f...

Develop a technique for the multi-scale modeling of cohesive interfaces to (1) obtain a better understanding of the micro-scale processes occurring during delamination and (2) use this knowledge to develop and quantify predictive models at the application scale. Methods The multi-scale scheme is shown in figure 3. At the macro-scale the cohesive zone (CZ) element formulation of Van den Bosch is...

Grouting treatment is the main technology to reduce or eliminate residual deformation and activation of foundations in goaf sites. Under influences overburden mining, distribution grouting foundation quite different from that conventional mechanism porous media. In this paper, considering time-dependent viscosity diffusion path slurry, permeation Bingham fluid derived based on seepage motion eq...

Fe-Ni alloys, which are kamacite (<10 wt% Ni), taenite (30 ~ 40 wt % Ni), and tetrataenite (ordered Fe 50 Ni 50), are the dominant magnetic minerals in the metamorphic (type 5-6) ordinary chondrites [1], and the carrier of the remanent magnetization is high coercivity tetrataenite [1,2,3]. Metallographic studies reported that there are two types of Fe-Ni grains in the metamor-phic ordinary chon...

In this study, fifty healthy normal volunteers were divided into 3 groups according to age: group A (15-30 years, n=14), group B (31-50 years, n=24), group C (>51 years, n=12). The FA and ADC values in PZ and CZ were measured, and difference between the PZ and CZ were assessed. The results indicated that no significant difference were found in the FA and ADC values between the left and right of...

The objectives this year have been to model the features of a CZ which we observed in the PhilSea09 experiment. The data from this found very abrupt transitions and into the CZ’s and narrow widths for them. We note that not all CZ’s ”focus”, i.e. sharp edges as we observed in the Philippine Sea. This feature has been noted by Brekhovskikh and Munk where they noted that such zones tend to remain...

Chenxi Li,a, b Xueming Luo,c Cheng Zhang,b, * Xiaoyi Wangd a School of Economics and Management, Beihang University, 100191 Beijing, China; b School of Management, Fudan University, 200433 Shanghai, China; cFox School of Business, Temple University, Philadelphia, Pennsylvania 19122; d School of Management, Zhejiang University, 310058 Hangzhou, China *Corresponding author Contact: chenxili@buaa....

We consider the following inverse problems for the class Cα of unilevel block α-circulants C = [Cs−αr ] k−1 r,s=0, where k > 1, C0, C1, . . . , Ck−1 ∈ Cd1×d2 , α ∈ {1, 2, . . . , k − 1}, gcd(α, k) = 1, and ‖ · ‖ is the Frobenius norm. Problem 1 Find necessary and sufficient conditions on Z ∈ Ckd2×h and W ∈ C1 for the existence of C ∈ Cα such that CZ = W , and find all such C if the conditions a...