摘要：本期访谈人物为刘保申先生的学生屈健教授。通过访谈,深入了解到刘保申少年时期艺术启蒙、青年时期求学经历、工作后的艺术历程及艺术风格转变,体会他在中国花鸟画创作中独有的艺术成就与勇于探索的艺术精神。屈健详细讲述了西方绘画、“海派”艺术、“长安画派”等艺术观念对刘保申艺术风格的影响,梳理了其独特的教学方法与教学思想,强调绘画中“借光”和“用光”。尤其在白色禽鸟艺术表现中突出对光与色关系的独特理解与运用,形成特有的色彩表现观念,拓展了中国当代花鸟画创作的“新空间”。

摘要：Based on the aerodynamic shape and structural form of the blade are fixed,a mathematical model of optimization design for wind turbine blade is *** model is pursued with respect to minimum the blade mass to reduce the cost of wind turbine *** material layup numbers of the spar cap are chosen as the design variables;while the demands of strength,stiffness and stability of the blade are employed as the constraint *** optimization design for a 1.5 MW wind turbine blade is carried out by combing above objective and constraint conditions at the action of ultimate flapwise loads with the finite element software *** with the original design,the optimization design result achieves a reduction of 7.2%of the blade mass,the stress and strain distribution of the blade is more reasonable,and there is no occurrence of resonance,therefore its effectiveness is verified.

摘要：Broadband sound sink/absorber via a structure with deep sub-wavelength thickness is of great and continuing interest in physics and engineering *** intuitive technique extensively used is to combine components(resonators)with quasi-perfect absorption to piece together a broad absorbing band,but the requirement of quasi-perfect absorption substantially places a very strict restriction on the impedance and thickness of the ***,we theoretically and experimentally demonstrate that a compact broadband acoustic sink that quasi-perfectly absorbs broadband arriving sound waves can be achieved with coherently coupled‘‘weak resonances"(resonant sound absorbing systems with low absorption peaks).Although each component exhibits rather low absorption peak alone,via manipulating the coherent coupling effect among the components,they collectively provide a remarkably improved performance over a wide frequency range with a significantly compressed *** illustrate the design principle,a hybrid metasurface utilizing the coaction of parallel and cascade couplings is presented,which possesses an average absorption coefficient of 0.957 in the quasi-perfect band(a>0:9)from 870 to 3224 Hz with a thickness of only 3.9 *** results open new avenues for the development of novel and highly efficient acoustic absorbers against low frequency noise,and more essentially,suggest an efficient approach towards on-demand acoustic impedance engineering in broadband.

摘要：声波作为信息和能量的载体,在国民经济发展和国家安全建设中有着重要的作用.近些年来,声学与其他学科进行深度交叉,产生了许多新兴的研究热点.其中,非厄米拓扑声学的研究是一个快速发展的前沿领域,得到了科研人员的广泛关注.非厄米拓扑声学利用声学结构探索和发现非厄米拓扑物理的内涵,一方面,可以利用宏观经典平台较为便利地构建和表征新奇的物态;另一方面,可以加深认识并丰富声波调控的手段,以期反哺声学器件设计.本文综述了近期该领域取得的研究进展,重点介绍了非厄米性调制的声拓扑态、非厄米性单独引起的声拓扑态和声学非厄米趋肤效应三个方面的工作.最后,我们对非厄米拓扑声学研究面临的挑战作了简单讨论,并展望了未来可能的研究方向.

摘要：Li metal batteries(LMBs)show great potential in energy storage because of their high energy density,but their practical application is hindered by safety issues and poor cycle life due to the growth of Li dendrites[1,2].Although liquid electrolytes(LEs)have remarkable advantages such as high ionic conductivity and good permeability[3].

摘要：对现行《水利水电工程设计洪水计算规范》SL44-2006的"附录A.3地区洪水的频率组合"中所介绍的频率组合方法做了分析,指出用该法计算的组合变量及其出现的频率,均将可能给出偏小的结果,从而难以满足生产建设的实际需要。本文提出水文随机变量频率组合方法的初探,以黄浦江防潮工程建设为例,通过上游来水和下游潮汐频率的组合计算,推求出更为合理的上海市区最高潮(水)位,供工程技术设计人员及规范修改时参考。

摘要：Dendralenes作为一种含有支链骨架的交叉共轭聚烯烃,是多种天然产物和光电材料的基本骨架,也是快速构建手性多环结构的重要中间体,在功能材料、天然产物化学、聚合物化学和合成化学等诸多领域占据重要地位.Dendralenes的合成与衍生化应用是一个曾经被忽视但正在兴起的领域.近年来,dendralenes的合成得到了较快发展,按dendralenes共轭单元数的不同概述了其合成领域的最新成果,重点介绍反应设计与机理,并展望了dendralenes的后续合成与应用研究发展.

摘要：中华民族深厚的文化底蕴,丰富了我们的设计语言,传统图形的创意思想和表现手法为现代图形的创意提供了大量可供学习借鉴的艺术元素,学习并领会前人遗留下来的文化资源,同时融合现代设计思潮和技术手段,才能设计出更能被本民族人民接受,彰显独特艺术风格的作品。

摘要：This paper investigates analysis and design of Low-Density Parity-Check （LDPC） coded Bit Interleaved Coded Modulation （BICM） over Additive White Gaussian Noise （AWGN） channel. It focuses on Gray-labeled 8-ary Phase-Shift-Keying （8PSK） modulation and employs a Maximum A Posteriori （MAP） symbol-to-bit metric calculator at the receiver. An equivalent model of a BICM communication channel with ideal interleaving is presented. The probability distribution function of log-likelihood ratio messages from the MAP receiver can be approximated by a mixture of symmetric Gaussian densities. As a result semi-Gaussian approximation can be used to analyze the decoder. Extrinsic information transfer charts are employed to describe the convergence behavior of LDPC decoder. The design of irregular LDPC codes reduces to a linear programming problem on two-dimensional variable edge-degree distribution. This method allows irregular code design in a wider range of rates without any limit on the maximum node degree and can be used to design irregular codes having rates varying from 0.5275 to 0.9099. The designed convergence thresholds are only a few tenths, even a few hundredths of a decibel from the capacity limits. It is shown by Monte Carlo simulations that, when the block length is 30,000, these codes operate about 0.62-0.75 dB from the capacity limit at a bit error rate of 10s.

摘要：海域盾构施工中常遇到大粒径孤石和基岩凸起段,通常采用爆破法进行预处理,爆破预处理的效果是盾构机顺利通过的关键。依托厦门轨道交通2号线工程,综合考虑海域孤石和基岩凸起段的覆盖层条件、爆破块度控制指标及海洋生物安全控制标准,提出了一种盾构隧道孤石和基岩凸起段的精细化爆破预处理方法。具体步骤包括:爆破孔网参数设计;炸药单耗、单孔装药量、平均块度尺寸的计算;装药结构及爆破网路设计;爆破块度分布效果预测;考虑生态环境影响进一步优化爆破方案。现场应用结果表明:爆破预处理后的块度在30 cm以内,满足盾构机推进的块度尺寸要求;盾构机在爆破预处理段能够顺利掘进,与正常段推进参数基本相近。实现了海域盾构隧道孤石和基岩凸起段的精细化、生态化、高效化和安全化爆破施工。