摘要：For the purpose of achieving high-resolution optimal solutions this paper proposes a nodal design variablebased adaptive method for topology optimization of continuum structures. The analysis mesh-independent density field, interpolated by the nodal design variables at a given set of density points, is adaptively refined/coarsened accord- ing to a criterion regarding the gray-scale measure of local regions. New density points are added into the gray regions and redundant ones are removed from the regions occupied by purely solid/void phases for decreasing the number of de- sign variables. A penalization factor adaptivity technique is employed-to prevent premature convergence of the optimiza- tion iterations. Such an adaptive scheme not only improves the structural boundary description quality, but also allows for sufficient further topological evolution of the structural layout in higher adaptivity levels and thus essentially enables high-resolution solutions. Moreover, compared with the case with uniformly and finely distributed density points, the proposed adaptive method can achieve a higher numerical efficiency of the optimization process.

摘要：Higher requirements for the accuracy of relevant models are put throughout the transformation and upgrade of the iron and steel sector to intelligent *** has been difficult to meet the needs of the field with the usual prediction model of mechanical properties of hotrolled *** data and difficult parameter adjustment limit deep learning models based on multi-layer networks in practical applications;besides,the limited discrete process parameters used make it impossible to effectively depict the actual strip processing *** order to solve these problems,this research proposed a new sampling approach for mechanical characteristics input data of hot-rolled strip based on the multi-grained cascade forest(gcForest)*** to the characteristics of complex process flow and abnormal sensitivity of process path and parameters to product quality in the hot-rolled strip production,a three-dimensional continuous time series process data sampling method based on time-temperature-deformation was *** basic information of strip steel(chemical composition and typical process parameters)is fused with the local process information collected by multi-grained scanning,so that the next link’s input has both local and global ***,in the multi-grained scanning structure,a sub sampling scheme with a variable window was designed,so that input data with different dimensions can get output characteristics of the same dimension after passing through the multi-grained scanning structure,allowing the cascade forest structure to be trained ***,actual production data of three steel grades was used to conduct the experimental *** results revealed that the gcForest-based mechanical property prediction model outperforms the competition in terms of comprehensive performance,ease of parameter adjustment,and ability to sustain high prediction accuracy with fewer samples.

摘要：为研究机械法联络通道多种施工参数对隧道结构及周围地层环境的影响效应,采用基于Sobol理论的全局敏感性分析方法,建立精细化表达隧道结构及施工辅助设施设计特征的有限元数值模型,结合全施工过程数值模拟试验及监测分析验证,开展施工参数全局敏感性影响分析。结果表明:1)破洞施工使得主隧道最大变形位移相比施工前增加约34%,最大应力水平增加15.5%,接触界面膜应力增加5%~8%,内支撑体系应力水平为-12~40 MPa,施工完成后有一定程度的回弹或减少;2)被切削环开洞口附近应力变形变化较明显,管环横截面内外边缘主应力Ⅲ分布曲线呈纺锤形等几何特征;3)地表位移和隧道变形的计算结果与相应监测值的平均值曲线及变化趋势接近,验证了数值模型结果的合理性;4)针对应力变形相关的不同施工响应目标指标,各施工参数如土舱压力、顶推力、刀盘转矩以及内支撑预应力等的敏感度大小排序各异,通过探讨敏感度最大的土舱压力参数对螺栓组轴力的影响规律特征,得出其影响安全可控。

摘要：针对小断层影响下深层页岩气储层井间拉链式压裂裂缝窜通规律认识不清的问题，基于有限—离散元方法（FDEM），采用具有初始宽度、零黏聚力及零抗张强度的节理模型表征小断层，建立了考虑小断层影响的水平井拉链式压裂裂缝扩展流—固耦合模型。以川南深层页岩气储层为例，利用现场微地震数据进行了模型验证，研究揭示了小断层影响下的拉链式压裂裂缝扩展及井间窜通规律。结果表明：相对于天然裂缝，小断层具有更强捕获水力裂缝及阻挡水力裂缝穿越延伸的能力。受天然裂缝低导流及小断层高导流高滤失影响，相同条件下通过天然裂缝窜通后响应井的压力涨幅更大，对应响应时间更长。随着小断层逼近角的减小，小断层与响应井之间距离的增加，小断层层数及带宽的减小，两井射孔孔眼错位距离的增加，响应井压力涨幅呈递增趋势，对应压力响应时间呈递减趋势。研究对于小断层发育的深层页岩气井拉链式压裂设计具有重要参考意义。

摘要：Transverse pressure gradient(TPG)is one of the key factors influencing the boundary layer airflow diversion in a bump *** paper proposes a novel TPG-based hypersonic bump inlet design *** method consists of two ***,a parametric optimization approach is employed to design a series of 2D inlets with various compression ***,according to the prescribed TPG,the optimized inlets are placed in different osculating planes to generate a 3D bump *** method provides a means to directly control the aerodynamic parameters of the bump rather than the geometric *** performing this method to a hypersonic chin inlet,a long and wide bump surface is formed in the compression wall,which leads to good integration of the bump/*** show that a part of the near-wall boundary layer flow is diverted by the bump,resulting in a slight decrease in the mass flow but a significant improvement in the total pressure *** addition,the starting ability is significantly improved by adding the bump *** reveals that the bump has a 3D rebuilding effect on the large-scale separation bubble of the unstarted ***,a mass flow correction is performed on the designed bump inlet to increase the mass flow to full airflow *** results show that the mass flow rate of the corrected bump inlet reaches up to 0.9993,demonstrating that the correction method is effective.

摘要：Physical unclonable function （PUF） makes use of the uncontrollable process variations during the production of IC to generate a unique signature for each IC. It has a wide application in security such as FPGA intellectual property （IP） protection, key generation and digital rights management. Ring oscillator （RO） PUF and Arbiter PUF are the most popular PUFs, but they are not specially designed for FPGA. RO PUF incurs high resource overhead while obtaining less challenge-response pairs, and requires ＂hard macros＂ to implement on FPGAs. The arbiter PUF brings low resource overhead, but its structure has big bias when it is mapped on FPGAs. Anderson PUF can address these weaknesses of current Arbiter and RO PUFs implemented on FPGAs. However, it cannot be directly implemented on the new generation 28 nm FPGAs. In order to address these problems, this paper designs and implements a delay-based PUF that uses two LUTs in an SLICEM to implement two 16-bit shift registers of the PUF, 2-to-1 multiplexers in the carry chain to implement the multiplexers of the PUF, and any one of the 8 flip-flops to latch 1-bit PUF signatures. The proposed delay-based PUF is completely realized on 28 nm commercial FPGAs, and the experimental results show its high uniqueness, reliability and reconfigurability. Moreover, we test the impact of aging on it, and the results show that the effect of aging on the proposed PUF is insignificant, with only 6% bit-flips. Finally, the prospects of the proposed PUF in the FPGA binding and volatile key generation are discussed.

摘要：随着NEG并网功率不断增大和负荷日益多元化,如何快速协调配网系统源荷功率平衡,实现新能源最大化消纳,已成为亟需解决的问题。为此,首先分析了配网网格特点;其次设计了一种基于配网网格NEG与LF信息的智能终端,给出了其功能、整体构成、供电电源、信息采集与传输方案以及源荷协调策略,以协调网格内源荷功率平衡;最后研制了相关产品,重点做了网格内源荷功率协调测试,并与目前方案进行了对比。结果表明,文中所设计智能终端能够对网格内源荷功率进行可靠协调,实现NEG最大化利用和多方信息共享,推广应用价值高。

摘要：A series of novel 5-（trifluoromethyl）-1H-pyrazole-4-carboxamide derivatives（6a–6n, 7a, 7b, and 8a-8f）were synthesised by placing the amide bond at the 4-position of the pyrazole ring. These derivatives differed from the structure of chlorantraniliprole analogues with the amide bond at the 5-position of the pyrazole ring. Preliminary bioassay results revealed that a few title compounds exhibited good insecticidal activities against lepidopteran pests, such as Plutella xylostella, Mythimna separate, Heliothis armigera, and Ostrinia nubilalis. Some title compounds also elicited broad-spectrum insecticidal activities against dipterous insects including Culex pipiens pallens after altering the amide position. Similar to pyrazole-5-carboxamide analogues, compounds 6b and 6e showed 100% insecticidal activity against P. xylostella, C. pipiens pallens, and M. separate at concentrations of 200, 2, and 200 mg/m L, *** finding suggested that 5-（trifluoromethyl）-1H-pyrazole-4-carboxamide derivatives are potential alternative insecticides for management of agriculture pests.

摘要：B型套筒广泛应用于管道泄漏永久性修复。为解决应用于高钢级管道存在设计壁厚过高、安装施工难度大和角焊缝延迟开裂等问题,开展国内外管道修复标准对标分析,研究国外管道壁厚与套筒差异较大时的实践做法。介绍新型B型套筒在设计方法、加工工艺、焊接方法和无损检测的研究成果,对于解决X80钢级管道缺陷修复问题具有指导意义。

摘要：受工程经济性、埋存可行性、碳捕集适用性等诸多因素影响,海上气田膜脱碳与CO_(2)封存技术仍处于可行性研发阶段。基于南海乐东15-1高碳气田CCUS工程项目,首次利用膜脱碳技术实现CO_(2)在海上平台就地捕集及回注地层埋存的工程实践,介绍了海上气田CCUS工艺流程,针对性地开展了膜脱碳设备比选及脱碳效果影响因素分析,明确了膜脱碳效果的影响因素;基于注入极限压力理论确定CO_(2)回注压力为8~11 MPa,设计日注气量为5万m^(3)/d;针对日注气量不足开展了工况分析及流程优化,通过提高高烃气流量实现CO_(2)回注量达到额定流量。乐东15-1气田CCUS海上工程表明了“膜脱碳碳捕集技术—CO_(2)回注压缩机—回注地层碳埋存”的CO_(2)捕集与封存全流程工程技术体系在海上平台应用是可行的,所形成的工程技术经验对中国海上油气田CCUS发展及应用具有重要的工程价值。