埕岛桩海地区连片地震资料的数据规则化处理

将数块小三维资料连片处理可以获得大区域的构造成像,较好地解决小区块三维资料单独成像引起的边界效应.由于这些小区块三维资料采集的年度、仪器、方法、面元、地表条件等不同,各区块资料在信噪比、能量、相位、波形、频率等方面存在很大的差异.在进行连片处理时需对资料做规则化处理,以消除这些差异.埕岛桩海地区地表跨越浅海、海陆过渡区和陆地,地震资料由26块小三维组成.通过资料特点的分析和研究,采用波形一致性子波匹配方法、矢量波组时差校正方法、时空变能量统计匹配方法、递进迭合式面元均化方法进行数据规则化处理,较好地解决了资料之间的不一致性问题,取得了预期的成像效果.     

铜录山古冶炼遗址的磁法探测试验

湖北省大冶市铜录山古铜矿遗址是中国乃至世界青铜文化的发源地,在该保护区发现有古代的采矿矿坑、冶炼等遗址。本文就2012年对保护区内的卢家垴、岩阴山脚测区内冶炼遗址的磁法探测试验和现场考古发掘验证的经历,介绍了磁法探测工作设计、资料处理解释及探测效果,以及发掘检验和完善提高的过程,本文的经历和所获得经验,为今后在冶炼遗址上探寻炼炉遗迹位置、范围提供了基础资料,进而为在该地区制定保护、发掘及为推进铜录山古铜矿遗址保护区建成国家考古遗址公园和申请世界遗产工作提供科学依据。     

模糊结构和机械系统的能度可靠性分析方法

模糊系统的可靠性评估是工程中倍受关注的重要问题。结构系统的可靠性与结构的失效模式有关。模糊结构系统失效的可能度取决于失效可能度最大的最危险失效模式。因此，最危险失效模式的识别及对应极限状态方程的建立是模糊结构系统可靠性分析的关键问题。本文基于模糊结构的能度可靠性理论，建立模糊结构和机械系统的能度可靠性分析模型。所提出的模糊结构体系失效模式的枚举准则，可在只需枚举出少量主失效模式的条件下，不漏掉最危险失效模式。算例分析表明文中方法是有效和可行的。     

基于紫外吸收光谱法的水中氨氮浓度测量方法研究

氨氮是水中常见的污染物,是各类水质检测重要 的指标。水中氨氮含量超标会影 响水生植物、动物的生长,导致水体环境恶化,水环境受到污染。因此,加强水中氨氮 的监测尤为重要。本文基于紫外光谱检测技术,搭建了水中氨氮浓度紫外光谱检测系统。 通过检测系统将液相氨氮转换为气相氨气,获得氨气在 190-235nm波长间的紫外吸 光度,并分别采用傅里叶滤波和傅里叶变换两种数据处理方式对吸光度信号进行分析。 结果表明,经傅里叶滤波后氨气的吸光度在190-235nm波长间存在明显的周期性的峰 值,周期约为4nm,随着氨气浓度的增加其吸光度峰值也增大。通过最小二乘法拟合 发现,氨气的吸光度和浓度之间存在着良好的线性关系,相关系数为0.99814。经傅里 叶变换后的吸光度信号在频域中存在特征频率,通过拟合发现,振幅强度与氨氮浓度之 间同样存在线性关系,相关系数为0.98686。实验证明可以根据氨气吸 光度获得氨氮的 浓度,为水中氨氮浓度的检测提供了新的检测手段。     

High‐Performance [001]c‐Textured PNN‐PZT Relaxor Ferroelectric Ceramics for Electromechanical Coupling Devices

[001]_C‐Textured 0.55Pb(Ni_1/3Nb_2/3)O₃–0.15PbZrO₃–0.3PbTiO₃ (PNN‐PZT) ceramics are prepared by the templated grain‐growth method using BaTiO₃ (BT) platelet templates. Samples with different template contents are fabricated and compared in terms of texture fraction, microstructure, and piezoelectric, ferroelectric and dielectric properties. High piezoelectric performance (d₃₃ = 1210 pC N^?1, d₃₃* = 1773 pm V^?1 at 5 kV cm^?1) and high figure of merit g₃₃?d₃₃ (21.92 × 10^?12 m² N^?1) are achieved in the [001]_C‐textured PNN‐PZT ceramic with 2 vol% BaTiO₃ template, for which the texture fraction is 82%. In addition, domain structures of textured PNN‐PZT ceramics are observed and analyzed, which provide clues to the origin of the giant piezoelectric and electromechanical coupling properties of PNN‐PZT ceramics.     

The quantum Fourier transform based on quantum vision representation

Quantum Fourier transform (QFT) plays a key role in many quantum algorithms, but the existing circuits of QFT are incomplete and lacking the proof of correctness. Furthermore, it is difficult to apply QFT to the concrete field of information processing. Thus, we firstly investigate quantum vision representation (QVR) and develop a model of QVR. Then, we design four complete circuits of QFT and inverse QFT and describe the functions of their components. Meanwhile, we prove the correctness of the four complete circuits using formula derivation. Next, 2D QFT and 3D QFT based on QVR are proposed for the first time. Experimental results with simulation show the proposed QFTs are valid and useful in processing quantum images and videos. In conclusion, this paper develops a complete framework of QFT based on QVR and provides a feasible scheme for QFT to be applied in quantum vision information processing.     

纵-弯复合振动超声挤压加工试验研究

为研究挤压加工时静压力、进给量和挤压速度等工艺参数对试件表面质量的影响,在挤压加工中引入纵-弯复合振动后对Q235钢轴件端面进行处理,并与普通挤压加工进行对比,基于正交试验结果构建了挤压加工后表面粗糙度和表面里氏硬度二次回归预测模型.试验发现:在相同加工工艺参数下,在普通挤压加工中引入纵-弯复合超声振动后获得的表面粗糙度Ra值更小,而表面里氏硬度值显著提高;采用两种挤压加工方法后工件表面粗糙度Ra值均随着静压力和进给量的增加而增大,而挤压速度的影响很小,进给量对表面粗糙度的影响最为显著;工件经超声挤压加工时静压力越大,则获得的表面硬度越大,且表面硬度随进给量的增大先增大后减小,而普通挤压加工后表面硬度随静压力和进给量的增大先增后减,且在两种加工方式下工件表面硬度基本不受挤压速度的影响.纵-弯复合振动超声挤压加工工艺适合Q235钢表面强化处理,构建的表面粗糙度和硬度的预测模型可用于指导Q235钢表面强化处理工艺生产.     

Empirical study on meta-feature characterization for multi-objective optimization problems

Neural Computing and Applications - Algorithm recommendation based on meta-learning was studied previously. The research on the meta-features extraction, which is a key for the success of...     

用PS-SnCl_4-CH_3COC_2H_5固载引发剂引发异丁基乙烯基醚聚合及其动力学

用PS-SnCl_4-CH_3COC_2H_5固载引发剂引发了异丁基乙烯基醚(IBVE)的聚合反应,研究了诸因素对IBVE聚合反应的影响。结果表明,在大气环境和常温下,IBVE本体聚合的动力学方程为R_p=K[I]~(2/3)。对不同的助剂,R_p的递减顺序为CH_2ClCH_2Cl,CCl_4,CHCl_3。聚合反应初期和中期的反应活化能分别为-26.48kJ/mol和45.63kJ/mol。聚合物的(?)_n随反应时间或单体转化率的增加而增大。在适宜的温度下,当固载引发剂用量较少,助剂用量较大时,该反应为易控制的匀速反应。     

A STEP-compliant Industrial Robot Data Model for robot off-line programming systems

Recently, various robot off-line programming systems have promoted their own robot data models, resulting in a plethora of robot representation methods and unchangeable data files among CAx and robot off-line programming systems. The current paper represents a STEP-compliant Industrial Robot Data Model (IRDM) for data exchange between CAx systems and robot off-line programming systems. Using this novel representation method, most resources involved in a robot manufacturing system can be represented. The geometric and mathematic aspects of industrial robots have been defined in IRDM, so that the robot off-line programming system could have abundant information to represent robots’ kinematic and dynamic behaviors. In order to validate the proposed models and approaches, a prototype robot off-line programming system with 3D virtual environment is presented. The functionalities of IRDM not only have significant meaning for providing a unified data platform for robot simulation systems, but also have the potential capability to represent robot language using the object-oriented concept.