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大而复杂形变区域中的精确三维形变反演——基于偏移的相位解缠和改进的多孔径SAR干涉测量集成技术在2016年熊本地震中的应用 Article

Won-Kyung Baek, Hyung-Sup Jung

《工程（英文）》 2020年第6卷第8期页码 927-935 doi: 10.1016/j.eng.2020.06.012

摘要：

常规合成孔径雷达（synthetic aperture radar, SAR）干涉测量（InSAR）已成功用于精确测量雷达视线（line-of-sight, LOS）方向上的表面形变，而多孔径SAR干涉技术（multiple-aperture SAR interferometry, MAI）可以用于精确测量沿轨迹（along-track, AT）方向的表面形变。InSAR和MAI方法的集成可以精确测量干涉对中的二维（two-dimensional, 2D）形变；最近，升降轨联合解算使得人们可以观测到精确的三维（three-dimensional, 3D）形变。本研究的目的是：①通过对基于偏移的相位解缠和改进的多孔径SAR干涉图进行集成，在大而复杂的形变区域中进行精确3D形变反演的可行性测试；②观测与2016年熊本地震有关的甚至包含断层线附近的3D形变场。L-band Synthetic Aperture Radar-2, PALSAR-2）降轨干涉对。

关键词：合成孔径雷达（SAR）常规SAR干涉测量（InSAR）多孔径SAR干涉技术（MAI） ALOS-2 PALSAR-2 三维形变反演 2016年熊本地震

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运动补偿残余误差对机载顺轨干涉SAR性能的影响 Article

Hui ZHANG,Jun HONG,Xiao-lan QIU,Ji-chuan LI,Fang-fang LI,Feng MING

《信息与电子工程前沿（英文）》 2016年第17卷第10期页码 1095-1106 doi: 10.1631/FITEE.1500311

摘要：概要：在机载合成孔径雷达（synthetic aperture radar, SAR）运动补偿中一般存在两个近似：波束中心近似和参考高程近似，这两种近似会在机载单天线SAR系统和机载干涉SAR系统成像过程中引入运动补偿残余误差本文针对机载顺轨干涉SAR（airborne along-track interferometric SAR, ATI-SAR）系统，分析了上述两种近似导致的运动补偿残余误差对干涉性能的影响。首先针对机载双天线ATI-SAR系统，在不存在参考高程误差和存在参考高程误差两种情况下分别推导了其运动补偿残余误差，然后利用机载仿真参数证明了推导公式的正确性，并展示了运补残余误差对ATI-SAR干涉相位的影响程度结果表明，当不存在参考高程误差时，由于运补残余误差导致的干涉相位误差可以忽略；而当存在参考高程误差且参考高程误差大于某个门限值时，对于相应的测速精度要求，由于波束中心近似导致的干涉相位误差不可忽略。本文的研究为机载ATI-SAR误差源分析和信号处理提供了理论基础。

关键词：合成孔径雷达（SAR）；顺轨干涉；运动补偿；残余误差；干涉相位

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多孔径光学成像系统及其光场采集数学模型 Review Article

祁启明,傅瑞罡,邵铮铮,王平,范红旗

《信息与电子工程前沿（英文）》 2022年第23卷第6期页码 823-844 doi: 10.1631/FITEE.2100058

摘要：

受昆虫复眼启发，为提高光学成像质量，如获得高分辨率图像或大视场图像，研究者提出了许多多孔径光学成像系统。光场采集数学模型是联系多孔径光学成像系统结构设计与应用的纽带，但光场采集数学模型较少被关注。本文系统梳理了典型多孔径光学成像系统（仿生复眼、光场相机、相机阵列），总结了不同结构下多孔径光学成像系统的一般性光场采集数学模型。列出的数学模型既可用于计算特定多孔径光学成像系统的关键指标，如视场大小和子图像重叠比等，也可作为数学工具，便于研究者完成对成像系统的定量设计与评估。

关键词：多孔径光学成像系统；仿生复眼；光场相机；相机阵列；光场采集模型

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sediment transport pattern and beach morphology in the vicinity of submerged groyne (case study: Dahane Sar

H. Afsoos Biria,M. A. Lashteh Neshaei,A. Ghabraei,M. A. Mehrdad

《结构与土木工程前沿（英文）》 2015年第9卷第1期页码 82-90 doi: 10.1007/s11709-014-0275-5

摘要： Marine structures, such as Groynes, Sea walls and Detached Breakwaters, are constructed in coast of area to improve coast stability against bed erosions due to changing wave and current pattern. Marine mechanisms and interaction with the hydraulic structures need to be intensively studied. Groynes are one of the most prominent structures that are used in shore protection and littoral sediment. The main hydraulic function of the groyne is to control the long shore current and littoral sediment transport. This structure can be submerged and provide the necessary beach protection without negative aesthetic impact. However, for submerged structures adopted for beach protection, the shoreline response to these structures is not well understood. The objective of this study is to predict sediment transport in the vicinity of submerged groyne and comparison with non-submerged groyne focusing on a part of the coast at Dahane Sar Sefidrood, Guilan Province, Iran, where serious coast erosion has been occurred. The simulations were designed using a one-line model which can be used as a first approximation of shoreline prediction in the vicinity of groyne. The results of the proposed model are compared with experimental data to determine the shape of the coast. The results of predicted beach deformation show that when submerged groyne construct in the beach, sediment accumulation will be slightly less than the non-submerged groyne; because transfer coefficient for the submerged groyne is more than non-submerged groyne. This result will cause more sediment passing on submerged groyne. Finally, the result of the present study show that using submerged groyne is an efficient way to control the sediment and beach erosion without causing severe environmental effect on the coast.

关键词： submerged groyne non-submerged groyne beach morphology Dahane Sar Sefidrood sediment transport

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纳米多孔储气材料的物理吸附特性研究进展 Review

Katie A. Cychosz,Matthias Thommes

《工程（英文）》 2018年第4卷第4期页码 559-566 doi: 10.1016/j.eng.2018.06.001

摘要：

评估纳米多孔材料的吸附性能并确定它们的结构表征，对于将这类材料用于包括气体储存在内的许多应用至关重要。气体吸附法可用于此表征，因为它可以评估从微孔到中孔的各种孔径。在过去的20 年中，关于有序纳米多孔材料中流体的吸附和相行为的知识以及基于统计力学的最先进的方法的创新和发展，如分子模拟和密度泛函理论，都取得了重大进展。笔者不仅讨论了流体在具有明确孔隙结构的各种纳米多孔材料中基础吸附机理的一些重要和中心特征，还讨论了这些特征对促进物理吸附表征和储存气体应用的重要性。

关键词：吸附表征高压吸附纳米多孔材料

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多孔质气体静压轴承在三轴转台设计中的应用

杜金名

《中国工程科学》 2005年第7卷第1期页码 65-68

摘要：多孔质气体静压轴承同其他节流形式的轴承相比具有很高的承载能力、静态刚度以及很好的阻尼效应。文章对多孔质气体静压轴承进行了理论分析，并同气体静压小孔节流轴承的静态性能进行了比较，结果表明，此类轴承的承载能力明显优于小孔节流轴承。

关键词：气体静压轴承多孔质小孔节流三轴转台

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未来无线网络的非正交多址接入技术 None

Zhi-guo DING, Mai XU, Yan CHEN, Mu-gen PENG, H. Vincent POOR

《信息与电子工程前沿（英文）》 2018年第19卷第3期页码 322-339 doi: 10.1631/FITEE.1800051

摘要：本文就新兴通信技术——非正交多址接入（non-orthogonal multiple access, NOMA）——对未来无线网络的影响进行了全面综述。具体地，介绍了NOMA原理对下一代多址接入技术设计的影响。讨论了NOMA在其他先进通信技术上的应用，包括无线缓存、多入多出技术、毫米波通信以及协同中继。

关键词：非正交多址；多天线技术；毫米波；混合多址；无线缓存；协作非正交多址；可见光通信

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大孔径光纤过渡器中光波特性分析

王云明,孙小菡,张明德

《中国工程科学》 2002年第4卷第10期页码 52-56

摘要：

提出了基于束传输法（BPM）的大孔径光纤锥形过渡器理论分析模型。

关键词：束传输法（BPM）大孔径光纤锥形过渡器插入损耗

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Seismic fragility curves for structures using non-parametric representations

Chu MAI, Katerina KONAKLI, Bruno SUDRET

《结构与土木工程前沿（英文）》 2017年第11卷第2期页码 169-186 doi: 10.1007/s11709-017-0385-y

摘要： Fragility curves are commonly used in civil engineering to assess the vulnerability of structures to earthquakes. The probability of failure associated with a prescribed criterion (e.g., the maximal inter-storey drift of a building exceeding a certain threshold) is represented as a function of the intensity of the earthquake ground motion (e.g., peak ground acceleration or spectral acceleration). The classical approach relies on assuming a lognormal shape of the fragility curves; it is thus parametric. In this paper, we introduce two non-parametric approaches to establish the fragility curves without employing the above assumption, namely binned Monte Carlo simulation and kernel density estimation. As an illustration, we compute the fragility curves for a three-storey steel frame using a large number of synthetic ground motions. The curves obtained with the non-parametric approaches are compared with respective curves based on the lognormal assumption. A similar comparison is presented for a case when a limited number of recorded ground motions is available. It is found that the accuracy of the lognormal curves depends on the ground motion intensity measure, the failure criterion and most importantly, on the employed method for estimating the parameters of the lognormal shape.

关键词： earthquake engineering fragility curves lognormal assumption non-parametric approach kernel density estimation epistemic uncertainty

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Investigation on multiple-melting behavior of nano-CaCO3/polypropylene composites

LIN Zhidan, ZENG Chunlian, MAI Kancheng

《化学科学与工程前沿（英文）》 2007年第1卷第1期页码 81-86 doi: 10.1007/s11705-007-0017-5

摘要： The multiple melting-peak behavior of polypropylene (PP) in nano-CaCO/PP composites and modified nano-CaCO/PP composites were investigated under the condition of isothermal crystallization and nonisothermal crystallization. The result indicated that the addition of nano-CaCO markedly increased the crystallization temperatures of PP and induced the formation of the β-crystal of PP. The crystallization temperatures of nano-CaCO/PP composites modified by reactive monomers were further increased, but the melting-peak intensity of the β-crystal of PP was not greatly influenced. While in the presence of dicumyl peroxide, nano-CaCO/PP composites modified by reactive monomers led to the significant increase in the melting-peak intensity of the β-crystal of PP. The double melting-peak of PP was observed, which was attributed to the formation of two kinds of different crystallization forms of α-crystal or β-crystal during the crystallization of PP. With the increase of crystallization temperatures, the double melting-peak moved toward the high-temperature side. The intensity of high-temperature melting peak was higher than that of low-temperature melting peak in nano-CaCO/PP composites. While in modified nano-CaCO/PP composites crystallized at higher temperature, the intensity of high-temperature melting peak was lower than that of low-temperature melting peak. The isothermal crystallization time had little effect on the melting temperatures.

关键词： polypropylene nano-CaCO/PP presence melting-peak behavior low-temperature

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Preparation of hydrogels with uniform and gradient chemical structures using dialdehyde cellulose and diamine by aerating ammonia gas

Peiwen Liu, Carsten Mai, Kai Zhang

《化学科学与工程前沿（英文）》 2018年第12卷第3期页码 383-389 doi: 10.1007/s11705-018-1718-7

摘要：

Hydrogels with precisely designed structures represent promising materials with a broad application spectrum, such as for sensor, tissue engineering and biomimetic technology. However, with highly reactive compounds, the preparation of hydrogels still needs an efficient approach for desired distribution of each component within hydrogels. In addition, a method for in situ preparation of gradient hydrogels is still lacking. Herein, we report the formation of hydrogels with either uniform or gradient internal structures via a novel, simple but very efficient method by aerating ammonia gas (NH₃ gas) into the solution of dialdehyde cellulose (DAC) and a diamine. As-prepared hydrogels exhibited uniform microscopic and chemical structure or gradient distribution of functional groups. Due to lots of aldehyde groups on DAC chains, functional hydrogels can be prepared by using diverse diamines. For instance, hydrogels prepared by using 1,6-hexanediamine as a cross-linker were responsive to pH values. Moreover, this controllable process of aerating NH₃ gas allows the in situ formation of gradient hydrogels; for instance, by using cyanamide as a reaction counterpart, gradient hydrogels with gradient distributions of cyanide groups were prepared.

关键词： hydrogel uniform gradient dialdehyde cellulose ammonia gas diamine

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近程毫米波合成孔径辐射计被动测距原理

王本庆,李兴国

《中国工程科学》 2010年第12卷第3期页码 95-99

摘要：

毫米波合成孔径技术利用了物体自身辐射电磁波的相位信息，采用很少阵元就能实现实时成像，但目前合成孔径技术只是限于亮温成像，缺少了目标的距离信息提出在近程条件下合成孔径被动测距原理和相应的双正交傅立叶变换算法，并给出了近程距离分辨率公式，近程成像的特点是成像公式中存在二次相位因子，而且距离分辨率和距离的平方成反比。毫米波合成孔径被动成像可以同时得到物体辐射的亮温分布和距离分布，能够有效克服离焦引起的图像模糊，对图像的反降晰和目标识别具有重要意义。

关键词：毫米波辐射计合成孔径近程成像被动测距 BFT

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基于孔径耦合微带结构馈电的单脉冲透射阵天线 Correspondence

寇娜1,2,3,余世星1,2,3,丁召1,2,3,张正平1,2,3

《信息与电子工程前沿（英文）》 2022年第23卷第3期页码 502-510 doi: 10.1631/FITEE.2000547

摘要：设计、加工、并测试了一款X波段单脉冲透射阵天线，该天线由平面透射阵和馈源天线组成，其中馈源天线集成了基于孔径耦合的微带结构以及和差网络。

关键词：孔径耦合；单脉冲天线；微带；透射阵列

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冲击作用下多孔材料热力学特征的模拟与分析

许爱国,张广财,蔚喜军,潘小飞,朱建士

《中国工程科学》 2009年第11卷第9期页码 13-19

摘要：

强冲击波的作用可在多孔材料中诱发复杂的时空耗散过程，在这期间系统整体处于远离平衡的状态，对这一过程的稳定模拟和结果分析均具有较强的挑战性。白色区域相对面积、边界总长度、欧拉特征量)与系统中“高温区”所占份额、“热点”在空间的分布方式之间的对应，揭示出Minkowski泛函演化特征与冲击波及多孔材料相互作用过程之间的对应

关键词：冲击波多孔材料物质点法形态学量度