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平面波导窄带干涉滤波方法的研究

光学精密工程 2007年第4期15卷 467-472页

作者：李小奇孙德贵中国科学院研究生院中国科学院长春光学精密机械与物理研究所应用光学国家重点实验室中国科学院长春光学精密机械与物理研究所应用光学国家重点实验室吉林长春130033 北京100039

基于多层膜干涉滤波的理论提出了一种在平面波导通道中进行干涉滤波的新方法,这种方法可以使窄带滤波器完全集成在波导通道中,实际上就是波导通道的一部分。根据这种方法优化设计了两种波导干涉滤波器单元器件,并且以27层开放式波导干... 详细信息

基于多层膜干涉滤波的理论提出了一种在平面波导通道中进行干涉滤波的新方法,这种方法可以使窄带滤波器完全集成在波导通道中,实际上就是波导通道的一部分。根据这种方法优化设计了两种波导干涉滤波器单元器件,并且以27层开放式波导干涉滤波器双腔结构为例,计算了垂直入射时的输出光谱和单腔结构滤波后的场强分布。最后,分别分析了滤波器的波导膜的材料、厚度和信号入射角度对输出光谱的峰值透过率、通带半宽度、消光比以及有效区域的影响,提出了进一步优化的方向。这种在平面波导通道中直接进行窄带滤波的技术将在光通信、光传感和光信息处理等很多方面有广泛的应用。

关键词：集成光学光开关波导滤波器干涉滤波透射光谱

Achieving Negatively Charged Pt Single Atoms on Amorphous Ni(OH)_(2)Nanosheets with Promoted Hydrogen Absorption in Hydrogen Evolution

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Nano-Micro Letters 2024年第10期16卷 213-224页

作者： Yue Liu gui Liu Xiangyu Chen Chuang Xue Mingke sun Yifei Liu Jianxin Kang Xiujuan sun Lin Guo School of Chemistry Beijing Advanced Innovation Center for Biomedical EngineeringKey Laboratory of Bio-inspired Smart Interfacial Science and TechnologyBeihang UniversityBeijing 100191People's Republic of China School of Chemistry Key Laboratory of Environmentally Friendly Chemistry and Applications of Ministry of EducationXiangtan UniversityXiangtan 411105HunanPeople'Republic of China

Single-atom(SA)catalysts with nearly 100%atom utilization have been widely employed in electrolysis for decades,due to the outperforming catalytic activity and ***,most of the reported SA catalysts are fixed through the strong bonding between the dispersed single metallic atoms with nonmetallic atoms of the substrates,which greatly limits the controllable regulation of electrocatalytic activity of SA *** this work,Pt-Ni bonded Pt SA catalyst with adjustable electronic states was successfully constructed through a controllable electrochemical reduction on the coordination unsaturated amorphous Ni(OH)_(2)nanosheet *** on the X-ray absorption fine structure analysis and first-principles calculations,Pt SA was bonded with Ni sites of amorphous Ni(OH)_(2),rather than conventional O sites,resulting in negatively charged Pt^(δ-).In situ Raman spectroscopy revealed that the changed configuration and electronic states greatly enhanced absorbability for activated hydrogen atoms,which were the essential intermediate for alkaline hydrogen evolution *** hydrogen spillover process was revealed from amorphous Ni(OH)_(2)that effectively cleave the H-O-H bond of H_(2)O and produce H atom to the Pt SA sites,leading to a low overpotential of 48 mV in alkaline electrolyte at-1000 mA cm^(-2)mg^(-1)_(Pt),evidently better than commercial Pt/C *** work provided new strategy for the control-lable modulation of the local structure of SA catalysts and the systematic regulation of the electronic states.

关键词： Hydrogen evolution reaction Amorphous Pt single atoms Hydrogen spillover

A　prospective　study　of　vertical　transmission　of　hepatitis　C　virus

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World Journal of Gastroenterology 1997年第2期3卷 54-56页

作者： sun de gui 1, LIU Cai Yun 1, MENG Zong Da 2, sun Yong de 2, WANG Shu Cong 1, YANG Yu Qi 1, LIANG Zheng Lun 3 and ZHUANG Hui 3 de-gui sun Cai-Yun Liu Shu-Cong Wang Yu-Qi Yang Guan County Sanitary and Antiepidemic Station Guan County 065500 Hebei Province China

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ＡｐｒｏｓｐｅｃｔｉｖｅｓｔｕｄｙｏｆｖｅｒｔｉｃａｌｔｒａｎｓｍｉｓｓｉｏｎｏｆｈｅｐａｔｉｔｉｓＣｖｉｒｕｓＳＵＮＤｅＧｕｉ１，ＬＩＵＣａｉＹｕｎ１，ＭＥＮＧＺｏｎｇＤａ２，ＳＵＮＹｏｎｇＤｅ２，ＷＡＮＧＳｈｕＣｏｎｇ１，ＹＡＮＧＹｕ...

关键词： hepatitis C virus RNA, viral disease transmission, vertical

Changes of the trace metals in ice core during 1915-2016 in coastal eastern Antarctica

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Advances in Climate Change Research 2024年第4期15卷 596-608页

作者： Jing-Wen LIU Chuan-Jin LI gui-Tao SHI Yan LIU Zhi-Heng DU Ming-Hu DING Shao-Peng GAO Cun-de XIAO Shi-Chang KANG Bo sun State Key Laboratory of the Cryosphere Science Northwest Institute of the Eco-Environment and ResourcesChinese Academy of SciencesLanzhou730000China University of Chinese Academy of Sciences Beijing 100049China Key Laboratory for Polar Science of State Oceanic Administration Polar Research Institute of ChinaShanghai 200136China Key Laboratory of Geographic Information Science(Ministry of Education) School of Geographic Sciences and Institute of Eco-ChongmingEast China Normal UniversityShanghai 200241China Institute of Tibetan Plateau and Polar Regions Meteorology Chinese Academy of Meteorological SciencesBeijing 100081China Key Laboratory of Tibetan Environment Changes and Land Surface Processes Instituie of the Tibetan PlateauChinese Academy of SciencesBeijing 100101China State Key Laboratory of Earth Surface Processes and Resource Ecology Beijing Normal UniversityBeijing 100875China

Antarctic trace metal records provide important information for grasping the influence of human activities on the environment over the last *** CA2016-75 ice core is located along the East Antarctic Zhongshan Station-Dome A,enhances the record of metals research in the East Antarctic region,and its high-resolution supplies data support for the study of high-frequency climatic drivers and the effect of human activities on the Antarctic environment.A thorough dataset on seven trace metals(Al,Fe,Mn,Cu,Zn,Ba and Pb)in a coastal ice core in eastern Antarctica during the previous 102 years(1915-2016)is presented in this *** has the lowest concentration(9.51±20.95 pg g^(-1)),and Ba has the highest concentration(36.57±51.35 ng g^(-1)).Notable variations are observed between the pre-1968 AD and post-1968 AD phases for Mn,Zn and *** abrupt,remarkable increase in the concentrations coincided with the change of metal smelting production in the southern *** addition to this,it may also be related to local Antarctic scientific research *** and Fe,the primary crustal elements,are essentially obtained from soil dust;Cu shows high crustal enrichment factors(EFc,>10),indicating that it is notably affected by anthropogenic ***,the anthropogenic activities in the Southern Hemisphere have had an impact on lead deposition in *** study not only enriches the trace metal historical record along the Zhongshan Station-Dome A but also provides a high-resolution ice core record,which is very crucial for the reconstruction of trace metal concentration changes in the last 100 years.

关键词： Eastern Antarctica Ice core Trace metals Human activities

Effects of synthetic site water on bentonite-concrete system for a potential nuclear waste repository

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Journal of Rock Mechanics and Geotechnical Engineering 2024年第9期16卷 3786-3797页

作者： Zhao sun Yong-gui Chen Wei-Min Ye Qiong Wang Dong-Bei Wu Zhen-Yu Yin Key Laboratory of Geotechnical and Underground Engineering of Ministry of Education Department of Geotechnical EngineeringTongji UniversityShanghai200092China department of Civil and Environmental Engineering The Hong Kong Polytechnic UniversityHung HomKowloonHong KongChina School of Chemical Science and Engineering Tongji UniversityShanghai200092China

In high-level nuclear waste(HLW)repositories,concrete and compacted bentonite are designed to be employed as buffer materials,which may raise a problem of interactions between concrete and *** interactions would lead to mineralogy transformation and buffer performance decay of bentonite under the near field environment conditions in a repository.A small-scale experimental setup was established to simulate the concrete-bentonite-site water interaction system from a potential nuclear waste repository in *** types of mortars were prepared to correspond to the concrete at different degradation *** results permit the determination of the following:(1)The macroproperties of Gaomiaozi(GMZ)bentonite(*** pressure,permeability,the final dry density,and water content of reacted samples);(2)The composition evolution of fluids from the synthetic site water-concrete-bentonite interaction systems;(3)The sample characterization including Fourier transform infrared spectroscopy(FTIR)and X-ray powder diffraction(XRD).Under the infiltration of the synthesis Beishan site water(BSW),the swelling pressure of bentonite decreases slowly with time after reaching its second swelling *** flux decreases with time during the infiltrations,and it tends to be stable after more than 120 *** to the cation exchange reactions in the BSW-concrete-bentonite systems,the divalent cations(Ca and Mg)were consumed,and the monovalent cations(Na and K)were *** dissolution of minerals in the bentonite such as albite causes Si increasing in the pore *** was concluded that the hydro-mechanical property degradation of bentonite takes place when it comes into contact with concrete mortar,even under low-pH groundwater *** soil dispersion,the uneven water content,and the uneven dry density in bentonite samples may partly contribute to the swelling decay of ***,the direct contact with concrete has an obvious effect on the performance

关键词： Mock-up device GMZ bentonite Site water-concrete-bentonite system Geochemistry Buffer performance

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掺Ge氧化硅薄膜波导制备工艺与应力研究

光子学报 2018年第12期47卷 87-91页

作者：孙庆雨孙喆禹邢文超孙德贵长春理工大学理学院长春130022 吉林华微电子股份有限公司吉林吉林130031

采用等离子体化学气相沉积法在硅基底上沉积氧化硅薄膜,研究在不同工艺条件下薄膜的应力变化情况和折射率分布规律.利用应力测试仪测定晶圆在镀膜前后的形变量进而获得应力值,并用棱镜耦合仪测试薄膜折射率.在其他条件相同的情况下,SiH_... 详细信息

采用等离子体化学气相沉积法在硅基底上沉积氧化硅薄膜,研究在不同工艺条件下薄膜的应力变化情况和折射率分布规律.利用应力测试仪测定晶圆在镀膜前后的形变量进而获得应力值,并用棱镜耦合仪测试薄膜折射率.在其他条件相同的情况下,SiH_4与N_2O的流量比分别设为24、27.6和30时,在1 539nm波长下薄膜平均折射率分别为1.466 7、1.459 2和1.455 7,对应的晶圆应力向着压应力增加,分别为-50MPa、-200MPa和-430MPa.掺入8.3×10^(-7) m^3/s GeH_4后,SiH_4与N_2O的流量比分别设为22.6、24和27.6时,薄膜平均折射率分别为1.475 8、1.471 4和1.463 3,对应的晶圆应力分别为25MPa、-210MPa和-270 MPa,是从拉应力向压应力变化的过程.结果表明,SiH_4与N_2O的流量比相同时,掺入GeH_4后折射率和对应的压应力明显增加.因此,通过对工艺条件的合理选择,可制备出折射率稳定的氧化硅波导薄膜,从而提高器件在整个晶片上的成品率.

关键词：薄膜氧化硅薄膜光波导应力折射率

A Fluorine-Functionalized 3D Covalent Organic Framework with Entangled 2D Layers

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Chinese Journal of Polymer Science 2024年第8期42卷 1210-1216页

作者： Li-Bang Xiao Zi-Han Wu Jun-Jie Xin Yuan-Peng Cheng Bo gui Jun-Liang sun Cheng Wang College of Chemistry and Molecular Sciences Wuhan UniversityWuhan 430072China College of Chemistry and Molecular Engineering Beijing National Laboratory for Molecular SciencesPeking UniversityBeijing 100871China

Constructing three dimensional(3D)covalent organic frameworks(COFs)through the entanglement of two dimensional(2D)nets is a promising but underdeveloped ***,we report the design and synthesis of a fluorine functionalized 3DCOF(3D-An-COF-F)formed by entangled 2D sql *** structure of 3D-An-COF-F was determined by the combination of continuous rotation electron diffraction technique and modelling based on the chemical information from real ***,compared to the isostructural 3D-An-COF without F atom s,3DAn-COF-F showed an improved CO_(2)sorption ability and higher CO_(2)/N_(2)*** study not only demonstrated the generality of constructing 3D COFs with entangled 2D nets by introducing bulky groups vertically in planar building blocks,but also will expand the diversity of 3D COFs for various applications.

关键词： 3D covalent organic frameworks Fluorine Entangled 2D layers Electron diffraction CO_(2)adsorption

Effects of forsythin extract in Forsythia leaves on intestinal microbiota and short-chain fatty acids in rats fed a high-fat diet

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Food Science and Human Wellness 2024年第2期13卷 659-667页

作者： Lanlan gui Shaokang Wang Jing Wang Wang Liao Zitong Chen Da Pan Hui Xia guiju sun Su Tian department of Nutrition and Food Hygiene School of Public HealthSoutheast UniversityNanjing 210009China Nanjing Municipal Center for Disease Control and Prevention Nanjing 210003China department of Nutrition and Food Hygiene School of Public HealthHebei Medical UniversityShijiazhuang 050017China

Forsythia suspensa,belonging to the deciduous shrubs of the Luteaceae family,a traditional Chinese medicine,has effects of alleviating swelling,clearing heat,detoxification and promoting blood *** leaves of *** contain multiple chemical components and have a long history of use in folk medicines and health *** purpose of this study was to explore the effects of forsythin extract from *** leaves on intestinal microbiota and short-chain fatty acid(SCFA)content in rats with obesity induced by a high-fat *** extract in *** leaves increased the abundance of the intestinal microbiota,ameliorated intestinal microbiota disorders and inhibited the increase in total SCFA content in the intestinal tract in rats with obesity induced by a high-fat *** results suggested that forsythin extract in *** leaves may slow the development of obesity induced by a high-fat diet;thus,its active components and efficacy are worthy of further study.

关键词： Forsythin High-fat diet Intestinal microbiota Short-chain fatty acid(SCFA)

Emerging memristors and applications in reservoir computing

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Frontiers of physics 2024年第1期19卷 219-239页

作者： Hao Chen Xin-gui Tang Zhihao Shen Wen-Tao Guo Qi-Jun sun Zhenhua Tang Yan-Ping Jiang School of Physics and Optoelectronic Engineering Guangdong University of TechnologyGuangzhou Higher Education Mega CenterGuangzhou 510006China

Recently, with the emergence of ChatGPT, the field of artificial intelligence has garnered widespread attention from various sectors of society. Reservoir Computing (RC) is a neuromorphic computing algorithm used to analyze time-series data. Unlike traditional artificial neural networks that require the weight values of all nodes in the trained network, RC only needs to train the readout layer. This makes the training process faster and more efficient, and it has been used in various applications, including speech recognition, image classification, and control systems. Its flexibility and efficiency make it a popular choice for processing large amounts of complex data. A recent research trend is to develop physical RC, which utilizes the nonlinear dynamic and short-term memory properties of physical systems (photonic modules, spintronic devices, memristors, etc.) to construct a fixed random neural network structure for processing input data to reduce computing time and energy. In this paper, we introduced the recent development of memristors and demonstrated the remarkable data processing capability of RC systems based on memristors. Not only do they possess excellent data processing ability comparable to digital RC systems, but they also have lower energy consumption and greater robustness. Finally, we discussed the development prospects and challenges faced by memristors-based RC systems.

关键词： reservoir computing memristor resistive switching artificial synapse neuromorphic computing