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Detecting nanoparticles by“listening”

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Frontiers of physics 2023年第5期18卷 113-131页

作者： haonan chang Jun Zhang State Key Laboratory of Superlattices and Microstructures Institute of SemiconductorsChinese Academy of SciencesBeijing 100083China Center of Materials Science and Optoelectronics Engineering University of Chinese Academy of SciencesBeijing 100049China

In the macroscopic world,we can obtain some important information through the vibration of objects,that is,listening to the ***,we can also get some information of the nanoparticles that we want to know by the means of“listening”in the microscopic *** this review,we will introduce two sensing methods(cavity optomechanical sensing and surface-enhanced Raman scattering sensing)which can be used to detect the *** cavity optomechanical systems are mainly used to detect sub-gigahertz nanoparticle or cavity vibrations,while surface-enhanced Raman scattering is a well-known technique to detect molecular vibrations whose frequency generally exceeds ***,the vibrational information of nanoparticles from low-frequency to high-frequency could be obtained by these two *** size of the viruses is at the nanoscale and we can regard it as a kind of *** and ultrasensitive detection of the viruses is the key strategies to break the spread of the viruses in the *** optomechanical sensing enables rapid,ultrasensitive detection of nanoparticles through the interaction of light and mechanical oscillators and surface-enhanced Raman scattering is an attractive qualitatively analytical technique for chemical sensing and biomedical applications,which has been used to detect the SARS-CoV-2 ***,investigation in these two fields is of vital importance in preventing the spread of the virus from affecting human’s life and health.

关键词： ultrasensitive sensing cavity optomechanics surface-enhanced Raman scattering

Refrigeration technologies of cryogenic chips

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Chip 2023年第3期2卷 41-52页

作者： haonan chang Jun Zhang State Key Laboratory of Superlattices and Microstructures Institute of Semicon-ductorsChinese Academy of SciencesBeijing 100083China Center of Mate-rials Science and Optoelectronics Engineering University of Chinese Academy of SciencesBeijing 100049China

Cryogenic electronics refers to the devices and circuits operated at cryogenic temperatures(below 123.15 K),which are made from a variety of materials such as insulators,conductors,semiconductors,superconductors and topological *** cryogenic electronics are endowed with some unique advantages that cannot be realized in room temperature,including high computing speed,high power performance and so *** the appropriate refrigeration tech-nology is critical for achieving the best performance of the cryogenic *** this review,the cryogenic technology was divided into non-optical refrigeration and optical refrigeration,where non-optical refrigeration technologies are relatively conventional refrigeration technologies,while optical refrigeration is an emerging research field for the cooling of the *** the current work,the fundamental principles,applications and development prospects of the non-optical refrigeration was introduced,also the research history,fundamental principles,existing problems and application prospects of the optical refrigeration was thoroughly reviewed.

关键词： Cryogenic chips Refrigeration technologies Optical refrig-eration

硅酸盐/聚氨酯脲复合加固材料的制备及性能研究

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聚氨酯工业 2024年第1期39卷 18-21页

作者：刘舒敏常澔男范福洋柴亚跃李万捷山西凝固力新型材料股份有限公司山西晋中030800

以硅酸盐、多亚甲基多苯基异氰酸酯(PAPI)等为主要原料制备硅酸盐/聚氨酯脲复合加固材料。研究了硅酸盐、PAPI、柠檬酸三辛酯及聚合物多元醇POP45G的用量对硅酸盐/聚氨酯脲复合加固材料性能的影响,并对复合加固材料进行了红外光谱及热... 详细信息

以硅酸盐、多亚甲基多苯基异氰酸酯(PAPI)等为主要原料制备硅酸盐/聚氨酯脲复合加固材料。研究了硅酸盐、PAPI、柠檬酸三辛酯及聚合物多元醇POP45G的用量对硅酸盐/聚氨酯脲复合加固材料性能的影响,并对复合加固材料进行了红外光谱及热学性能表征。结果表明:以82~86份的混合硅酸盐水玻璃等为A组分,以65~67份的PAPI、8~10份的柠檬酸三辛酯、15~20份的POP45G等为B组分,由A、B组分混合制备得到非结晶的无规聚合物硅酸盐/聚氨酯脲复合加固材料,其力学性能优异,阻燃性能优良。该复合加固材料绿色环保,且具有良好的安全性及性价比。

关键词：硅酸盐聚氨酯脲复合材料加固材料力学性能

Terahertz phononic crystal in plasmonic nanocavity

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Journal of Semiconductors 2023年第8期44卷 94-100页

作者： Zhenyao Li haonan chang Jia-Min Lai Feilong Song Qifeng Yao Hanqing Liu Haiqiao Ni Zhichuan Niu Jun Zhang State Key Laboratory of Superlattices and Microstructures Institute of SemiconductorsChinese Academy of SciencesBeijing 100083China Center of Materials Science and Optoelectronics Engineering University of Chinese Academy of SciencesBeijing 100049China Beijing Academy of Quantum Information Sciences Beijing 100193China Joint Laboratory of Advanced Semiconductor Nanjing Guoke Semiconductor CO.LtdNanjing 210000China

Interaction between photons and phonons in cavity optomechanical systems provides a new toolbox for quantum information technologies.A GaAs/AlAs pillar multi-optical mode microcavity optomechanical structure can obtain phonons with ultra-high frequency(~THz).However,the optical field cannot be effectively restricted when the diameter of the GaAs/AlAs pillar microcavity decreases below the diffraction limit of ***,we design a system that combines Ag nanocav-ity with GaAs/AlAs phononic superlattices,where phonons with the frequency of 4.2 THz can be confined in a pillar with~4 nm *** Q_(c)/V reaches 0.22 nm^(-3),which is~80 times that of the photonic crystal(PhC)nanobeam and~100 times that of the hybrid point-defect PhC bowtie plasmonic nanocavity,where Q_(c) is optical quality factor and V is mode *** optome-chanical single-photon coupling strength can reach 12 MHz,which is an order of magnitude larger than that of the PhC *** addition,the mechanical zero-point fluctuation amplitude is 85 fm and the efficient mass is 0.27 zg,which is much smaller than the PhC *** phononic superlattice-Ag nanocavity optomechanical devices hold great potential for applications in the field of integrated quantum optomechanics,quantum information,and terahertz-light transducer.

关键词： Optomechanics phononic crystal Ag plasmonic nanocavity confinement coupling

Peptide inhibitors blocking PD-1/PD-L1 interaction for cancer immunotherapy

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Peptide inhibitors blocking PD-1/PD-L1 interaction for cance...

Portable Structure Surface Crack Detection System Based on Android Platform

第十届全国免疫学学术大会

作者： Beiyuan Liu haonan chang Yuanming Qi Lei Liu Yanfeng Gao School of Life Sciences Zhengzhou University Department of Chemistry Tsinghua University

Aim:Blockade of the protein-protein interaction between the transmembrane programmed cell death 1 protein(PD-1)and its ligand PD-L1 emerges as a promising immunotherapy for treating ***:The protein of PD-L1-Ig V was expressed in ***,and the isomer D-PD-L1-Ig V was synthesized by chemical *** peptides were screened by phage displayed *** affinity was tested by BIAcore and ***

关键词： Cancer immunotherapy Therapeutic peptide Mirror-image phage display Protein chemical synthesis PD-1

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Wuhan University Journal of Natural Sciences 2024年第2期29卷 154-164页

作者： WANG Huifeng PENG haonan TANG Yu GUAN Yueyuan LIANG Yaru WANG Lisha ZHAO Yu WANG Xiaoyan GAO Rong HUANG He School of Electronics and Control Engineering Chang'an UniversityXi'an 710000ShaanxiChina Research Institute of Highway Ministry of Transport Beijing 100000China State Key Laboratory of Traction Power Southwest Jiaotong UniversityChengdu 610000SichuanChina Highway School Chang'an UniversityXi'an 710000ShaanxiChina

Cracks,potholes,and other defects often occur on infrastructure such as bridges,among which cracks are one of the most frequent *** have diverse shapes and are difficult to *** manual inspection methods are inefficient and have low accuracy,while automated inspection machines are bulky and inconvenient to carry and *** on the shortcomings of existing detection technologies,this paper proposes a portable structural surface crack detection system based on the Android platform using a portable hand-held image acquisition *** system captures cracks on the structure's surface and obtains high-definition crack ***,these images are transmitted to portable smartphone terminals through ***,the image is pre-processed using weighted averaging,grayscale linear transformation,and adaptive median ***,the improved Canny edge detection algorithm is applied to identify crack information,and the edge segmentation algorithm is used to determine the crack ***,based on camera calibration,the pixels are converted into the length data required for actual *** results show that the system is easy to operate,and it not only has crack storage and tracking functions,but also can effectively measure the crack width on the surface of *** measurement accuracy of this system reaches the sub-pixel level,and in actual testing,compared with the crack width gauge,the maximum relative error does notexceed6.25%.

关键词： structural crack portable image processing detection accuracy crack parameter

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高炉喷吹重整焦炉气工艺分析及减碳潜力研究

化工学报 2024年第6期75卷 2344-2352页

作者：常成功宋皓楠雷飞霞狄子琛程芳琴山西大学资源与环境工程研究所山西太原030006

钢铁行业碳排放占我国碳排放总量的14%~18%,是工业领域排放量最高的部门。高炉-转炉工艺钢铁产量占我国钢铁总产量的89%,工艺流程长,吨钢碳排放达2 t。基于高炉-转炉工艺的碳减排是钢铁行业实现脱碳目标的关键。基于能质平衡模型,分析... 详细信息

钢铁行业碳排放占我国碳排放总量的14%~18%,是工业领域排放量最高的部门。高炉-转炉工艺钢铁产量占我国钢铁总产量的89%,工艺流程长,吨钢碳排放达2 t。基于高炉-转炉工艺的碳减排是钢铁行业实现脱碳目标的关键。基于能质平衡模型,分析焦炉气及重整焦炉气用于高炉喷吹对高炉直接还原度、理论焦比值等工艺参数的影响,系统评估该工艺有望产生的高炉二氧化碳减排效益。结果表明,提高富氢气喷吹量和温度可有效降低焦比;而相同喷吹量条件下提高氢纯度,由于热补偿原因,焦比会有所上升。当焦炉气被重整为97.9%的富氢气体时,可实现高炉减碳34.62%,相比直接喷吹焦炉气,减碳潜力提升17.76%。碳减排主要得益于焦比降低和喷吹气碳质元素减少。高炉气发电也是减碳的关键环节,当喷吹气氢纯度由59.0%提升至97.9%时,该环节碳减排量由9.04%提升至10.85%。通过将焦炉气重整有望突破高炉喷吹富氢气体减碳潜力上限,具有潜在推广价值。

关键词：模型焦炉气二氧化碳氢碳减排

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采用改进矩阵型可重构拓扑的锂离子电池均衡策略

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西安交通大学学报 2024年第6期58卷 174-185页

作者：李艳波常悦陈圆媛吕浩楠张云锐姚博彬长安大学能源与电气工程学院西安710064 河南交通投资集团有限公司河南交投服务区有限责任公司郑州450016 长安大学电子与控制工程学院西安710064

为解决串联锂离子电池组中各电池特性(或参数)不一致性问题,提出了一种采用改进矩阵型可重构拓扑的锂离子电池组均衡策略。将电池组中各电池的荷电状态作为均衡目标参数,通过开关矩阵控制电池小组在串联与并联拓扑之间来回切换,实现各... 详细信息

为解决串联锂离子电池组中各电池特性(或参数)不一致性问题,提出了一种采用改进矩阵型可重构拓扑的锂离子电池组均衡策略。将电池组中各电池的荷电状态作为均衡目标参数,通过开关矩阵控制电池小组在串联与并联拓扑之间来回切换,实现各电池单体及电池小组之间的均衡,并通过隔离荷电状态最低的电池单体或电池小组加快均衡速度。使用MATLAB/Simulink软件进行仿真,并与原矩阵型可重构均衡策略进行对比,仿真结果表明:与原矩阵型可重构均衡策略相比,改进均衡策略在负载为10、20和40 W时可分别提升13.1%、27.1%和30.1%的均衡速度;在考虑开关导通电阻时,所提出的改进均衡策略在均衡过程后期通过荷电状态差值造成的电压差加速了均衡过程,在导通电阻较大时仍能有效均衡电池组,有效地避免了原矩阵型可重构均衡策略的均衡效果随导通电阻增大而变差,甚至无法均衡电池组的缺陷,成功达到均衡目标。由此证明所提的改进矩阵型均衡策略相较于原矩阵型均衡策略具有更好的均衡效果。

关键词：锂离子电池均衡策略不一致性荷电状态

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冻融循环作用对PP-ECC劣化行为研究

混凝土 2024年第6期 30-34,42页

作者：左龙飞杨宗驰蔡畅刘梦辉刘耕园李福海吴昊南西南交通大学土木工程学院四川成都610031

针对冻融循环对聚丙烯纤维工程水泥基复合材料(PP-ECC)性能的影响,以质量损失、相对动弹性模量、抗压和抗拉强度等指标对其冻融劣化进行表征,利用试验数据建立冻融环境下PP-ECC材料各项性能的劣化规律,结合扫描电子显微镜(SEM)和压汞仪(... 详细信息

针对冻融循环对聚丙烯纤维工程水泥基复合材料(PP-ECC)性能的影响,以质量损失、相对动弹性模量、抗压和抗拉强度等指标对其冻融劣化进行表征,利用试验数据建立冻融环境下PP-ECC材料各项性能的劣化规律,结合扫描电子显微镜(SEM)和压汞仪(MIP)从微观角度去分析PP-ECC试件冻融破坏机理。结果表明:冻融损伤是一个由表及里、循序渐进的过程。冻融循环作用下PP-ECC材料的轴心抗压强度、极限压缩应变与冻融循环次数近似呈线性相关,而相对动弹性模量、劈裂抗拉强度、开裂拉伸性能、极限拉伸性能的退化规律均为二次曲线下降。通过SEM和MIP试验观察到随冻融循环的增加,试样内部出现大量孔洞及微裂缝,裂缝不断发展延伸最终呈网状分布,平均孔径持续增加,有害孔和多害孔开始增多,结构愈加疏松。

关键词：聚丙烯纤维工程水泥基复合材料冻融循环力学性能抗冻性微观结构分析