摘要：As an industry and a discipline,geotechnical investigation in China differs from that in the USA and European countries in its course of emergence and evolution. For over half a century,Chinese geotechnical investigation professionals witnessed continuous technical advances as they undertook independently almost all of China's large-scale construction projects. Based on projects that won the "National Outstanding Engineering Investigation" Gold Medal Awards since the year 2000,this paper discusses the achievements of geotechnical investigation in the context of comprehensive technical ability,project evaluation and analysis,hi-tech applications and engineering monitoring,and analyzes several factors that have hindered the industry's further development and alignment with international practice. Finally,some suggestions are given for future improvement.

摘要：A series of Ag2–xO/FTO-i electrodes(where i denotes the current density during the electrodeposition, and i = 0.5, 1, 2, 3, 4, or 7) was fabricated in 0.1 M K2B4O7 electrolyte containing Ag+ ions by galvanostatic electrocrystallization. The electrode composition and morphology were characterized using X-ray powder diffraction, scanning electron microscopy, and X-ray photoelectron spectroscopy. The results reveal that the electrode films consist of Ag2O, but some of the Ag+ ions on the {111} crystal facets are oxidized into Ag2+ ions. Furthermore, the Ag2–xO/FTO-1 electrode shows a triangular slice shape of a parallel matrix with a larger exposed area of {111} crystal facets than other Ag2–xO/FTO-i(i = 0.5, 2, 3, 4, or 7) electrodes. Electrocatalytic experiments prove that the Ag2–xO/FTO-1 electrode produces the highest oxidative current density, has an overpotential of 417 m V at 10 m A cm–2, and has a Tafel slope of 47 m V dec–1 in 0.1 M K2B4O7. Electrochemical impedance spectra indicate that Ag2–xO/FTO-1 electrodes have the best ability for charge transfer. In addition, in the I-t test over 10 h, the current density decreased 4%. Fortunately, both O–O and Ag2+ species were detected after electrocatalysis and a possible mechanism for the oxygen evolution reaction is proposed in which the formation of Ag2+ and O–O species on {111} facets plays a critical role.

摘要：According to the different stress paths,similar model test and PFC simulation test of tunnel surrounding rock are designed to compare the failure mechanisms at macroscopic and mesoscopic *** following conclusions are drawn.1)Excavation unloading will disturb the surrounding rock to form a certain excavation damaged zone.2)Under the loading path,the stress of surrounding rock failure is 1.500 MPa;under the unloading path with initial stress of 60% σ_(Zmax) and 100% σ_(Zmax),the failure stress is 1.583 and 1.833 MPa respectively in the model test.3)In terms of the failure mode of rocks under different stress paths,tensile fractures first appear in two sides of the vertical walls;thereafter,the spandrel and arch foot are loosened due to the stress *** fractures gradually coalesce with those occurring in the vertical walls.4)In the process of excavation unloading,the proportion of shear cracks is 35.3%,and the rock is subject to strong shear *** final failure surface is approximately V-shaped.5)The tangential peak stress on the vertical walls at the free face is the lowest;the vertical walls at the free face show the poorest bearing capacity and are easily subjected to tensile failure.

摘要：讨论了在低对比度、强干扰的情况下 ,对弱目标的提取和跟踪方法 ,设计了独特的空域采样器 ,进而提出了一种在实际系统上可实时实现的分割算法 ,最后给出了实际外场实验中的处理结果 。

摘要：传统上,对于依据原始资料进行地层的划分与合并往往依靠工程师个人的经验与习惯。引入了模糊聚类概念,提出了一种根据基本物理力学指标进行土层归并分类的合理方法,物理意义明确,计算简捷,具有普遍意义。还提出了一种用参数的变异系数来检验模糊聚类结果的方法,使模糊聚类的结果与统计参数对应起来,从而使验证结果满足规范的规定,保证了地层归并的合理性。

摘要：教室作为教学活动发生的主要场所,是教学改革的前沿。智慧教室作为智慧教育的典型代表,自然成为了教育技术工作者关注的焦点。文章在深入分析阐述智慧教室的内涵、特征的基础上,构建了智慧教室的系统模型。同时,文章以中国矿业大学智慧教室建设为例,给出了智慧教室建设的解决方案,并对其在教学中的实际应用进行了效果分析,以期对智慧教室的建设起到抛砖引玉的作用。

摘要：在创建智慧校园的背景下,建设智慧教室是高校改善教学环境、提高课堂教学质量的必然选择.基于此,文章首先对智慧教室进行了介绍;随后以中国矿业大学为例,从设计理念、子系统功能、软硬件部署、空间环境等方面描述了智慧教室的建设概况;最后从讲授式教学、演示型教学、课堂互动、小组协作等角度,分析了智慧教室对传统教学方式的影响.在智慧教室,教师可将传统教学模式与信息化教学模式进行深度融合,开展更具个性化、更符合学生学习发展规律的教学活动,从而提高教学成效,促进教学改革与创新.

摘要：研究了采用提升构造具有任意偶数阶消失矩,满足对称性,且仅用一个自由参数表达的Deslauriers-Dubuc(D-D)双正交插值小波.首先,采用多相矩阵理论推导出了此类小波存在的条件;然后,给出了对应小波滤波器和插值小波变换的构造算法.采用算法具体构造了分别具有消失矩对(4,2)、(4,4)、(6,2)以及(6,4)等4类一参数表达的D-D插值小波;最后,以自由参数为自变量,根据编码增益准则,优化设计了4种用于图像编码的插值小波,其滤波器系数全为二进制分数,可实现非乘法运算的离散小波变换(Discrete wavelet transform,DWT).系统分析表明,两种小波的压缩性能超过CDF-9/7小波,对于纹理图像,PSNR增益达到0.44dB,并且计算复杂度可降低17%以上.实验同时表明,新小波的重构图像具有更好的主观可视质量.

摘要：根据中国聚变工程实验堆(CFETR)设计要求,参考氦冷固态包层实验包层模块(HCCB TBM)的设计经验,完成了CFETR固态包层的中子学设计分析,并评估了中平面位置可开窗口的最大面积。设计分析结果表明,基于增殖单元的固态包层中子学设计方案的氚增殖比(TBR)达到了1.243,满足CFTER氚自持设计要求;中平面可以开出的辅助窗口的最大面积为11.43m2。

摘要：本文基于中国固态实验包层模块(CN HCCB-TBM)优化设计,应用ANSYS软件参数化语言编程方法,对中国固态TBM在ITER等离子体两种主破裂事故下的电磁载荷进行了评估与分析,并利用分析结果进行了电磁-结构和电磁-热的耦合计算。研究结果表明中国固态TBM的更新结构设计在等离子体瞬态变化中符合安全设计要求。