荔浦市岩质崩塌形成条件及失稳运动特征

通过对荔浦市境内碳酸盐岩区岩质崩塌及该区域地质环境条件的调查,总结了岩质崩塌的规模、发育高度、控制结构面等发育特征,分析了岩质崩塌形成条件,并判断岩质崩塌的失稳运动特征。本文以一处危岩为例,用无人机进行三维扫描并分析其形成原因及预测其失稳运动特征。     

基于区块链技术的公益时间银行系统

在现有的时间银行系统中，时间币的发行功能和结算功能完全集中到一个中心节点上。这种极度中心化的功能结构，不仅存在容易发生中心节点单点失效、数据容易被篡改等信息安全问题，还存在着时间币的发行和流通缺乏透明度以及时间币的结算依赖中心化的结算机构等问题。针对这些问题，提出了一种基于区块链技术的解决方法。首先，将时间币的发行功能和结算功能从中心节点上分离出来；然后，利用具有分布式去中心化、集体维护和不可篡改等特性的区块链技术，将分离出来的发行功能逐步去中心化，将分离出来的结算功能去中心化，形成公益时间链（PWTB）；最终，PWTB利用区块链技术以去中心化的方式将时间银行系统由单个节点维护账本变成由集体维护一个分布式的共享账本，使时间币的发行和流通公开透明，时间币的结算不依赖某个中心化的节点。安全分析表明所设计的PWTB能够实现安全的信息传输与存储，以及数据的共享。     

巷道过陷落柱顶板安全技术措施

为了保证9109回风顺槽安全快速过X0陷落柱,保证过陷落柱期间顶板稳定性,七一煤矿通过技术研究,采用导硐分层爆破施工工艺,提出了“撞楔超前支护+注浆锚棚支护”联合加强支护措施。通过实际应用,过陷落柱期间顶板未发生冒落现象,顶板下沉量控制在0.13m以下,取得了显著成效。     

车载空调控制器的新型按键旋钮溃缩设计

本文针对乘用车内部凸出物的法规要求对车载空调控制器的旋钮按键溃缩进行了研究和设计，描述了这种新型旋钮按键溃缩设计相对于目前常用的方案在成本、空间、可靠性等方面的优势。根据实际设计结果表明，本文所应用的新型旋钮按键溃缩设计能在成本与空间有限的情况下可靠的满足法规对乘用车内部凸出物的要求，为乘用车内部凸出物溃缩方案提供了新方向，值得我们推广应用。     

Design of two-channel filter bank using nature inspired optimization based fractional derivative constraints

In this article, a novel approach for 2-channel linear phase quadrature mirror filter (QMF) bank design based on a hybrid of gradient based optimization and optimization of fractional derivative constraints is introduced. For the purpose of this work, recently proposed nature inspired optimization techniques such as cuckoo search (CS), modified cuckoo search (MCS) and wind driven optimization (WDO) are explored for the design of QMF bank. 2-Channel QMF is also designed with particle swarm optimization (PSO) and artificial bee colony (ABC) nature inspired optimization techniques. The design problem is formulated in frequency domain as sum of L₂ norm of error in passband, stopband and transition band at quadrature frequency. The contribution of this work is the novel hybrid combination of gradient based optimization (Lagrange multiplier method) and nature inspired optimization (CS, MCS, WDO, PSO and ABC) and its usage for optimizing the design problem. Performance of the proposed method is evaluated by passband error (ϕ_p), stopband error (ϕ_s), transition band error (ϕ_t), peak reconstruction error (PRE), stopband attenuation (A_s) and computational time. The design examples illustrate the ingenuity of the proposed method. Results are also compared with the other existing algorithms, and it was found that the proposed method gives best result in terms of peak reconstruction error and transition band error while it is comparable in terms of passband and stopband error. Results show that the proposed method is successful for both lower and higher order 2-channel QMF bank design. A comparative study of various nature inspired optimization techniques is also presented, and the study singles out CS as a best QMF optimization technique.     

Face Recognition Based on Gabor Feature Extraction Followed by FastICA and LDA

Over the past few decades, face recognition has become the most effective biometric technique in recognizing people’s identity, as it is widely used in many areas of our daily lives. However, it is a challenging technique since facial images vary in rotations, expressions, and illuminations. To minimize the impact of these challenges, exploiting information from various feature extraction methods is recommended since one of the most critical tasks in face recognition system is the extraction of facial features. Therefore, this paper presents a new approach to face recognition based on the fusion of Gabor-based feature extraction, Fast Independent Component Analysis (FastICA), and Linear Discriminant Analysis (LDA). In the presented method, first, face images are transformed to grayscale and resized to have a uniform size. After that, facial features are extracted from the aligned face image using Gabor, FastICA, and LDA methods. Finally, the nearest distance classifier is utilized to recognize the identity of the individuals. Here, the performance of six distance classifiers, namely Euclidean, Cosine, Bray-Curtis, Mahalanobis, Correlation, and Manhattan, are investigated. Experimental results revealed that the presented method attains a higher rank-one recognition rate compared to the recent approaches in the literature on four benchmarked face datasets: ORL, GT, FEI, and Yale. Moreover, it showed that the proposed method not only helps in better extracting the features but also in improving the overall efficiency of the facial recognition system.     

云南铜厂沟铜钼矿低贫损分段崩落与浅孔留矿耦合采矿法探索

铜厂沟矿区多为破碎、中厚、急倾斜矽卡岩型铜钼矿体，原设计采用上向水平分层充填采矿法，在采矿实验中存在作业安全性差、劳动生产效率低、损失贫化大、采矿成本高等缺陷，严重制约了试生产组织。矿山急迫需要一种安全、高效、成本能够控制的采矿方法满足试生产矿石持续供应。通过充分研究，提出了低贫损分段崩落与浅孔留矿耦合采矿方法的设想，进一步降低了安全风险、简化工艺、控制损失贫化等。通过采矿方法的优化设计，解决了企业生产存在的实际问题，提高了采矿效率，对其它同类矿山具有一定的参考借鉴意义。     

MDCK细胞库的建立、检定及其生物学特性

目的建立MDCK细胞的主细胞库及工作细胞库,并进行检定,同时评价其生物学特性。方法从欧洲细胞保藏中心(European Collection of Authenticated Cell Culture,ECACC)引进1株MDCK细胞,经传代扩大培养后,分别建立主库及工作细胞库。按照《中国药典》三部(2015版)规定的方法对细胞库进行细胞活力、细胞形态、无菌、支原体及细胞内外源病毒因子检查,并对细胞生长状况、传代稳定性、流感病毒敏感性进行检测。结果建立的MDCK细胞主种子库及工作种子库细胞形态呈不规则的上皮样细胞状,生长状态良好,细胞活率分别为96.0%和95.5%,无菌、支原体及细胞内外源病毒因子检查结果均合格。MDCK细胞生长曲线均呈S型,培养48~96 h进入对数生长期,随后进入平台期。连续传10代48 h细胞活率在93.0%~95.5%之间,较稳定。MDCK细胞对流感病毒较敏感,对B型流感病毒的敏感性高于A型流感病毒。结论建立的主细胞库及工作细胞库各项检测结果均符合《中国药典》规定,具有良好的传代稳定性及流感病毒敏感性。     

茅台酒厂26层剪力墙结构大楼爆破拆除

根据茅台酒厂钟楼的结构特性、周围环境特点及爆破要求,分析该栋26层高楼的爆破拆除控制要点,采用了单向三折叠的爆破方案。通过爆破方法预先拆除切口内部分剪力墙,有效地降低爆破总药量;通过切口间开设铰链,使大楼在空中充分解体,减小了塌落体的触地块度,从而降低了触地冲击;采用胶皮网覆盖和敷设减振带等防护措施,有效地控制了爆破飞石及触地振动。结合高速摄影对钟楼倒塌后坐造成排污管及排污沟破坏的原因进行了分析,可为类似工程提供参考。