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Advanced Fiber Materials 2024年第6期6卷 1798-1812页

作者： yujin Zhang Guowen Zhang yuqi Dong Yongcai Wu liqian yu Yongxiao Bai Institute of Soft‑Matter and Advanced Functional Materials Gansu Province Carbon New Material Industry Technology CenterSchool of Materials and EnergyLanzhou UniversityLanzhou 730000China

Graphene composite yarns have demonstrated significant potential in the development of multifunctional wearable elec-tronics,showcasing exceptional conductivity,mechanical properties,flexibility,and lightweight ***,their performance is limited by the weak interfacial interaction between the fibers and ***,a polydopamine-reduced graphene oxide(PDA-RGO)interfacial modulation strategy is proposed to prepare graphene-coated cotton yarns with high electrical conductivity and ***-RGO serves as an interfacial bonding molecule that interacts with the cotton yarn(CY)substrate to establish a hydrogen interface,while interconnecting with highly conductive graphene throughπ-π*** developed interface-designed graphene-coated yarn demonstrates an impressive average electrical conductivity of(856.27±7.02)S/m(i.e.,average resistance of(57.57±5.35)Ω).Simultaneously,the obtained conductive yarn demonstrates an exceptional average tensile strength of(172.03±8.03)MPa,surpassing that of primitive CY by approximately 1.59 *** conductive yarns can be further used as low-voltage flexible wearable heaters and high-sensitivity pressure sensors,thus showcasing their remarkable potential for high-performance and multifunctional wearable devices in real-world applications.

关键词： Graphene Interface modulation Conductive yarn Flexible wearable device

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基于自由曲面的紧凑型离轴三反无焦系统设计

光子学报 2022年第5期51卷 289-299页

作者：闫钧华胡子佳朱德燕陈阳张寅俞立谦南京航空航天大学空间光电探测与感知工业和信息化部重点实验室南京211106

为了满足空间光学系统结构紧凑、尺寸小型化和高分辨率的要求,提出了一种紧凑型离轴三反无焦系统初始结构的设计方法,应用Zernike多项式自由曲面对初始结构进行优化,分别完成了红外波段φ600 mm包络、入瞳口径为350 mm、压缩比为7倍的... 详细信息

为了满足空间光学系统结构紧凑、尺寸小型化和高分辨率的要求,提出了一种紧凑型离轴三反无焦系统初始结构的设计方法,应用Zernike多项式自由曲面对初始结构进行优化,分别完成了红外波段φ600 mm包络、入瞳口径为350 mm、压缩比为7倍的光阑离轴和视场离轴三反无焦光学系统的设计。设计结果表明两种光学系统各视场波像差均小于0.1λ(λ=3.7μm)。公差分析表明光阑离轴三反无焦系统波像差小于0.08λ的概率达到90%以上,视场离轴三反无焦系统波像差小于0.07λ的概率达到90%以上,说明了设计的有效性。同时将光阑离轴和视场离轴两种方式的光学系统进行对比,视场离轴三反无焦系统可以使结构更紧凑,波像差更小,分辨率更高。本文提出的无焦系统初始结构的设计方法满足结构紧凑、高分辨率的实际应用需求。

关键词：光学设计无焦系统离轴三反自由曲面公差分析

Interference on TD-SCDMA Uplink by PHS Downlink

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ZTE Communications 2007年第2期5卷 47-51页

作者： yu liqian 1,2 Liu Huailin 2 (1. Nanjing University of Posts and Telecommunications,Nanjing 210003,China 2. Mobile Division,ZTE Corporation,Shanghai 201203,China)

In the process of mobile network planning and construction,interference problem between Time Division Synchronous Code Division Multiple Access (TD-SCDMA) and Personal Handyphone System (PHS) should be solved. First,a simulation is started on a TD-SCDMA single system platform,then the interference due to the PHS downlink on a TD-SCDMA uplink is analyzed. Finally,the space isolation is obtained. During the simulation,the TD-SCDMA system adopts an omnidirectional base station and a directional base station respectively. The two kinds of base stations are compared from the aspects of cell coverage distance and user interruption. The simulation results indicate that TD-SCDMA directional base station supports longer distance of cell coverage than omnidirectional base station. If TD-SCDMA and PHS coexist,a directional base station will require 10 dB less isolation than an omnidirectional base station.

关键词： SCDMA TD PHS

感兴趣未知红外波段遥感图像超分辨率反演重构

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Transactions of Nanjing University of Aeronautics and Astronautics 2023年第4期40卷 472-486页

作者：闫钧华俞立谦夏翀翔章琪琪许祯瑜张寅范君杰工业和信息化部空间光电探测与感知重点实验室(南京航空航天大学) 南京211106 南京航空航天大学航天学院南京211106

提出了感兴趣未知波段遥感图像超分辨率反演重构算法。基于已有波段的多光谱图像,根据构建的地物光谱反射率数据库,利用高斯混合聚类算法和相关距离法,对辐射定标和大气校正后的场景光谱反射率图像的物质进行分类与类别判定。基于流形... 详细信息

提出了感兴趣未知波段遥感图像超分辨率反演重构算法。基于已有波段的多光谱图像,根据构建的地物光谱反射率数据库,利用高斯混合聚类算法和相关距离法,对辐射定标和大气校正后的场景光谱反射率图像的物质进行分类与类别判定。基于流形空间约束的图像解混算法得到场景图像的地物分布,据此,反演重构感兴趣未知波段地物光谱反射率图像。基于已有波段的远红外图像,利用温度反演算法与插值算法,反演重构感兴趣未知波段高分辨率地物温度场分布。根据地物光谱反射率信息和地物温度场信息,利用遥感链路成像模型,超分辨率反演重构出感兴趣未知红外波段高分辨率遥感图像。实验结果表明,本文算法能够超分辨率反演重构出感兴趣未知红外波段不同场景的高分辨率遥感图像,重构图像与场景实况图像的相似度很高,提升图像的目标检测识别能力。

关键词：超分辨率反演重构遥感图像地物分布光谱反射率字典温度场反演重构

Ph^+骨髓增生异常综合征伴单纯del(5q)一例报告并文献复习

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中华血液学杂志 2020年第11期41卷 940-942页

作者：张延清刘仁同潘佳琪徐萍李晓云于丽倩高海燕姜永芳哈尔滨医科大学附属第二医院血液内科 150086 滨州医学院附属医院血液科 256600

骨髓增生异常综合征(MDS)伴单纯del(5q)是MDS分型中的一个独立的亚型,WHO 2016版MDS诊断标准将仅有del(5q)或del(5q)伴有1个其他异常[-7、del(7q)除外]均定义为MDS伴单纯del(5q)[1]。这一概念的更新,扩大了MDS伴单纯del(5q)的诊断范围,... 详细信息

骨髓增生异常综合征(MDS)伴单纯del(5q)是MDS分型中的一个独立的亚型,WHO 2016版MDS诊断标准将仅有del(5q)或del(5q)伴有1个其他异常[-7、del(7q)除外]均定义为MDS伴单纯del(5q)[1]。这一概念的更新,扩大了MDS伴单纯del(5q)的诊断范围,刘丹等[2]分析了77例MDS伴单纯del(5q)患者,其中13例伴1个非-7/del(7q)的其他染色体异常。目前国内尚未见MDS del(5q)伴Ph^+染色体异常的报道,本研究我们报道1例Ph+的MDS伴单纯del(5q)患者的诊治情况,现报告如下。

关键词：骨髓增生异常综合征染色体异常诊断范围诊断标准诊治情况 MDS

Amino-functionalized poloxamer 407 with both mucoadhesive and thermosensitive properties:preparation, characterization and application in a vaginal drug delivery system

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Acta Pharmaceutica Sinica B 2017年第5期7卷 593-602页

作者： liqian Ci Zhigang Huang yu Liub Zhepeng Liu Gang Wei Weiyue Lu School of Medical Instrument and Food Engineering University of Shanghai for Science and Technology Department of Pharmaceutics School of Pharmacy Fudan University & Key Laboratory of Smart Drug Delivery (Fudan University)Ministry of Education

Lack of mucoadhesive properties is the major drawback to poloxamer 407(F127)-based in situ hydrogels for mucosal administration. The objective of the present study was to construct a novel mucoadhesive and thermosensitive in situ hydrogel drug delivery system based on an aminofunctionalized poloxamer for vaginal administration. First, amino-functionalized poloxamer 407(F127-NH2) was synthesized and characterized with respect to its micellization behavior and interaction with mucin. Then using acetate gossypol(AG) as model drug, AG-loaded F127-NH2-based in situ hydrogels(NFGs) were evaluated with respect to rheology, drug release, ex vivo vaginal mucosal adhesion, in vivo intravaginal retention and local irritation after vaginal administration to healthy female mice. The results show that F127-NH2 is capable of forming a thermosensitive in situ hydrogel with sustained drug release properties. An interaction between positively charged F127-NH2 and negatively charged mucin wasrevealed by changes in the particle size and zeta potential of mucin particles as well as an increase in the complex modulus of NFG caused by mucin. Ex vivo and in vivo fluorescence imaging and quantitative analysis of the amount of AG remaining in mouse vaginal lavage all demonstrated greater intravaginal retention of NFG than that of an unmodified F127-based in situ hydrogel. In conclusion, amino group functionalization confers valuable mucoadhesive properties on poloxamer 407.

关键词： Poloxamer 407 Amino group Acetate gossypol In situ hydrogel Mucoadhesive gel

Theoretical perspective on synthetic man-made life:Learning from the origin of life

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Quantitative Biology 2023年第4期11卷 376-394页

作者： Lu Peng Zecheng Zhang Xianyi Wang Weiyi Qiu liqian Zhou Hui Xiao Chunxiuzi Liu Shaohua Tang Zhiwei Qin Jiakun Jiang Zengru Di yu Liu International Academic Center of Complex Systems Beijing Normal UniversityZhuhaiChina Swarma Research BejingChina Department of Philosophy Shanghai Jiao TongUniversityShanghaiChina Center for Biological Science and Technology Advanced Institute of Natural SciencesBeijing Normal UniversityZhuhaiChina Center for Statistics and Data Science Bejing Normal UniversityZhuhaiChina

Creating a man-made life in the laboratory is one of life science's most intriguing yet challenging *** in synthetic biology and related theories,particularly those related to the origin of life,have laid the groundwork for further exploration and understanding in this field of artificial life or man-made *** there remains a wealth of quantitative mathematical models and tools that have yet to be applied to this *** this paper,we review the two main approaches often employed in the field of man-made life:the top-down approach that reduces the complexity of extant and existing living systems and the bottom-up approach that integrates welldefined components,by introducing the theoretical basis,recent advances,and their *** then argue for another possible approach,namely"bottom-up from the origin of life":Starting with the establishment of autocatalytic chemical reaction networks that employ physical boundaries as the initial compartments,then designing directed evolutionary systems,with the expectation that independent compartments will eventually emerge so that the system becomes *** approach is actually analogous to the process of how life *** this paper,we aim to stimulate the interest of synthetic biologists and experimentalists to consider a more theoretical perspective,and to promote the communication between the origin of life community and the synthetic man-made life community.

关键词： artificial cell autocatalytic ladderpath origin of life protocell

Pollution Characteristics of PM2.5 during a Typical Haze Episode in Xiamen, China

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Atmospheric and Climate Sciences 2013年第4期3卷 427-439页

作者： Fuwang Zhang Jinsheng Chen Tianxue Qiu liqian Yin Xiaoqiu Chen Jianshuan yu Environmental Monitoring Center of Fujian Fuzhou China Environmental Monitoring Center of Xiamen Xiamen China Institute of Urban Environment Chinese Academy of Sciences Xiamen China

In this study, mass concentrations and chemical compositions of fine particles, mass concentrations of coarse particles, light extinction, and meteorological parameters in the atmosphere ofXiamenwere presented and analyzed to study the chemical and optical characteristics of a typical haze episode from Dec 25, 2010 to Jan 1, 2011. The major chemical compositions of PM2.5, such as water soluble inorganic ions (WSIIs), carbonaceous fractions (mainly composed of organic carbon (OC) and elemental carbon (EC)), and elements were determined. The results showed that with the typical haze episode process, the concentrations of PM2.5 mass, WSIIs, OC, EC, and TE first increased and then decreased. The average concentrations of PM2.5 mass in the stages of Before Haze, During Haze, and After Haze were (88.80 ± 19.97), (135.41 ± 36.20), and (96.35 ± 36.26) μg/m3, respectively. The corresponding average concentrations of secondary organic carbon (SOC) were 6.72, 8.18, and 10.39 μg/m3, accounting for 46.5%, 27.0%, and 61.0% of OC, respectively. S42- , NO3-, and NH4+ were three major WSIIs species, accounting for 31.4%, 26.0%, and 12.1% of total WSIIs. The major elements in PM2.5 were S, K, Fe, Zn, Pb, Ti, and Mn, covering 97.9% of the total elements, while the percentage of the other ten elements was only 2.1%. The average value of light extinction coefficients (bext) was 371.0 ±147.1 Mm-1 during the typical haze episode. The average percentage contributions to bext were 39.3% for organic mass, 19.9% for elemental carbon, 16.0% for ammonium sulfate, 13.0% for coarse mass, and 11.8% for ammonium nitrate.

关键词： Fine Particles Haze Water Soluble Inorganic Ions Organic Carbon Elemental Carbon Elements Light Extinction Coefficients Xiamen

Morphing UAV Formation Control Based on Adaptive Dynamic Programming

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Morphing UAV Formation Control Based on Adaptive Dynamic Pro...

第43届中国控制会议

作者： Ruifeng Li liqian Dou Hui yu Zheyu Zhang Hao Cheng School of Electrical Engineering and Automation Tianjin University

In this study,an adaptive dynamic programming-based collaborative tracking control algorithm is developed for the formation of morphing unmanned aerial vehicles(UAVs).The multi-morphing UAVs system is divided into the position and attitude *** the position subsystem,a novel cost function fused with the impact of UAV morphing is introduced and the position controllers for morphing UAVs are developed using adaptive dynamic programming(ADP).To quantify the impact of morphing,a high-order finite-time observer is introduced which estimates the acceleration from aerodynamic force acting on the *** the attitude subsystem,an integral back-stepping controller is *** stability of morphing UAV formation is theoretically proven with the Lyapunov *** involving comparisons with PID algorithm and sliding mode control(SMC) method have been conducted to validate its effectiveness and robustness.

关键词： Morphing Unmanned Aerial Vehicle Formation Control Adaptive Dynamic Programming Optimal Control

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直升机旋翼振动主动控制方法研究进展

哈尔滨工业大学学报 2023年第8期55卷 1-17页

作者：陈钰宗群张秀云窦立谦天津大学电气自动化与信息工程学院天津300072

直升机特有的旋翼动力学结构使其拥有极高的战略发展价值,但旋翼在工作过程中产生的振动问题也对直升机的飞行性能造成了严重影响,因此,研究旋翼振动控制方法对直升机性能提升有重大意义。针对由直升机主旋翼工作而引发的机身振动控制问... 详细信息

直升机特有的旋翼动力学结构使其拥有极高的战略发展价值,但旋翼在工作过程中产生的振动问题也对直升机的飞行性能造成了严重影响,因此,研究旋翼振动控制方法对直升机性能提升有重大意义。针对由直升机主旋翼工作而引发的机身振动控制问题,首先,从旋翼引起机身振动的原因以及振动的频率特征出发,分析了主动振动控制的原理。其次,基于直升机振动的周期性质,将振动控制方法划分为频域控制和时域控制,并对频域方法以及时域方法中的时域高阶谐波方法、鲁棒方法、智能方法以及其相关试验成果展开综述及总结。另外,针对振动传递抑制技术进行了简单介绍,并对国内研究机构的主动振动控制试验进行了梳理。最后,归纳了振动控制方法存在的不足,并在此基础上指出了直升机主动控制方法的未来发展方向,应进一步深入针对稳定飞行状态的鲁棒自适应控制和针对全飞行状态的智能自学习控制方法研究,并开展面向性能提升的综合主动控制系统设计。

关键词：直升机旋翼振动载荷减振方法主动控制飞行试验