检索结果-南通市图书馆

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

钢桁梁斜拉桥横向结构体系设计

广东土木与建筑 2024年第7期31卷 54-57页

作者：黄毅东广东省交通规划设计研究院集团股份有限公司广州510507

中山某特大桥主桥桥跨布置为(136+312+880+312+136)m,桥梁全长1776 m,为双塔钢桁梁斜拉桥。主梁采用双主桁+板桁结合结构。主桁桁宽42.2 m,是目前国内跨径最大、桥面最宽的双层公路钢桁梁斜拉桥。横向结构体系占比大,本桥的横向结构体... 详细信息

中山某特大桥主桥桥跨布置为(136+312+880+312+136)m,桥梁全长1776 m,为双塔钢桁梁斜拉桥。主梁采用双主桁+板桁结合结构。主桁桁宽42.2 m,是目前国内跨径最大、桥面最宽的双层公路钢桁梁斜拉桥。横向结构体系占比大,本桥的横向结构体系设计显得尤为重要。设计对横梁体系和纵横梁体系进行了研究,采用有限元软件ANSYS建立钢桁梁局部模型,对两种结构体系的竖向刚度、桥面板应力、U肋应力进行了对比分析,分析结果表明两种结构体系均满足要求。同时,借鉴同类钢桁梁斜拉桥的成熟经验,对两种横向结构体系的经济性进行比选分析,在节间距为12.8 m的情况下,经济性相当,节间距增大至14 m时,纵横梁体系经济性更具优势。由于边跨采用混凝土桥面板进行压重时,纵横梁体系中的主横梁受力较大,需要增大梁高,考虑到全桥景观效果的一致性,本桥横向结构体系采用横梁体系更优。

关键词：钢桁梁双层公路桥斜拉桥正交异性桥面板横向结构体系横梁体系纵横梁体系

在线全文

学校读者我要写书评

暂无评论

中山香山大桥主桥主梁结构设计

桥梁建设 2024年第2期54卷 118-123页

作者：吴海平黄毅东喻志然何海孙向东广东省交通规划设计研究院集团股份有限公司广东广州510507

中山香山大桥主桥为双层钢桁梁公路斜拉桥,跨径布置为(136+312+880+312+136)m。桥塔采用人字形混凝土塔,下设整体式钻孔灌注桩;斜拉索采用∅7 mm高强度锌-铝合金镀层平行钢丝索;约束体系采用带纵向阻尼器的半飘浮体系。主梁采用2片N形主... 详细信息

中山香山大桥主桥为双层钢桁梁公路斜拉桥,跨径布置为(136+312+880+312+136)m。桥塔采用人字形混凝土塔,下设整体式钻孔灌注桩;斜拉索采用∅7 mm高强度锌-铝合金镀层平行钢丝索;约束体系采用带纵向阻尼器的半飘浮体系。主梁采用2片N形主桁的钢桁梁结构,桁宽42.2 m,标准梁段桁高2.8 m。上、下弦杆和腹杆均采用带加劲肋的箱形截面,横梁均采用鱼腹式。边跨187.2 m范围内下层桥面采用混凝土桥面板起压重作用,其余上、下层桥面板均采用正交异性钢桥面板。下层纵向钢-混结合段位于辅助墩往跨中第4个节段,距辅助墩51.2 m,设置承压板、支撑加劲肋、预应力钢束、剪力钉和PBL板;横向钢-混结合段位于下层行车道两侧钢桥面板和混凝土桥面板之间(距下弦杆2.2 m处),设置剪力钉、PBL板和1.3 m宽UHPC后浇段。采用有限元软件进行全桥整体受力分析及桥面板局部分析,结果表明:结构满足规范要求。主梁采用大节段整体吊装施工,标准吊装节段长度为25.6 m,节段间除钢桥面板和弦杆顶板采用焊接外,其余均采用高强度螺栓连接。

关键词：斜拉桥公路桥双层钢桁梁正交异性钢桥面板钢-混结合段全焊节点结构设计

在线全文

学校读者我要写书评

暂无评论

某铜矿提铜降硅试验研究

黄金 2024年第5期45卷 40-43页

作者：黄一东江西理工大学资源与环境工程学院

某铜矿经选别后所得铜精矿含SiO_(2)约26%,SiO_(2)品位过高会增加后续冶炼成本,但提高铜品位、降低SiO_(2)品位可能会降低铜回收率。为了能够更好地提铜降硅,开展了试验研究。结果表明:随着再磨细度的提高,SiO_(2)品位呈下降趋势,铜品... 详细信息

某铜矿经选别后所得铜精矿含SiO_(2)约26%,SiO_(2)品位过高会增加后续冶炼成本,但提高铜品位、降低SiO_(2)品位可能会降低铜回收率。为了能够更好地提铜降硅,开展了试验研究。结果表明:随着再磨细度的提高,SiO_(2)品位呈下降趋势,铜品位呈上升趋势,铜回收率呈先上升后趋于平稳趋势;在磨矿细度-0.074 mm占75%,再磨细度-0.023 mm占85%条件下,采用一粗二扫三精的闭路试验流程,可获得铜品位23.40%,含SiO_(2 ) 12.40%,铜回收率89.42%的铜精矿。

关键词：铜精矿回收率二氧化硅浮选粗精矿再磨

基于线阵InGaAs相机的光伏电池板光致发光成像系统研究

同方期刊数据库博看期刊评论

在线全文

学校读者我要写书评

暂无评论

电子测量技术 2024年第5期47卷 9-15页

作者：黄益东钱芸生张益军徐晗南京理工大学电子工程与光电技术学院南京210094

现有光伏电池板缺陷检测多采用电致发光激励以及面阵相机检测等方法,存在操作复杂、效率低等问题,为此开展基于线阵InGaAs相机的光伏电池板光致发光成像系统研究。首先,设计线阵InGaAs相机硬件框架与逻辑框架,以FPGA驱动线阵InGaAs相机... 详细信息

现有光伏电池板缺陷检测多采用电致发光激励以及面阵相机检测等方法,存在操作复杂、效率低等问题,为此开展基于线阵InGaAs相机的光伏电池板光致发光成像系统研究。首先,设计线阵InGaAs相机硬件框架与逻辑框架,以FPGA驱动线阵InGaAs相机完成数据采集与图像显示。通过固定模式噪声去除算法与直方图双向均衡算法,去除了缺陷图像中固定模式噪声,同时提升了图像的对比度和清晰度。最后通过搭建整体成像系统,通过光致发光成像对不同种类的光伏电池板的多种缺陷进行成像实验,检测精度达到0.2 mm/pixel。实验结果表明该系统可以完成对单晶硅与多晶硅光伏电池板中隐裂、黑斑、坏片、混档和脏污等缺陷的检测。

关键词：光致发光 FPGA 缺陷检测 InGaAs传感器光伏电池板

Experimental long-distance quantum secure direct communication

在线全文

学校读者我要写书评

暂无评论

Science Bulletin 2017年第22期62卷 1519-1524页

作者： Feng Zhu Wei Zhang Yubo Sheng yidong huang Tsinghua National Laboratory for Information Science and Technology Department of Electronic Engineering Tsinghua University Beijing 100084 China College of Telecommunications and Information Engineering Nanjing University of Posts and Telecommunication Nanjing 210003 China

Quantum secure direct communication(QSDC) is an important quantum communication branch, which realizes the secure information transmission directly without encryption and decryption ***, two table-top experiments have demonstrated the principle of QSDC. Here, we report the first long-distance QSDC experiment, including the security test, information encoding, fiber transmission and decoding. After the fiber transmission of 0.5 km, quantum state fidelities of the two polarization entangled Bell states are 91% and 88%, respectively, which are used for information coding. We theoretically analyze the performance of the QSDC system based on current optical communication technologies,showing that QSDC over fiber links of several tens kilometers could be expected. It demonstrates the potential of long-distance QSDC and supports its future applications on quantum communication networks.

关键词： Quantum secure direct communication Polarization entangled Bell state Optical fibers Bell’s inequality test Bell state measurement

Luminescence properties of phosphate phosphors Ba3Gd1-x(PO4)3：xSm^3＋

在线全文

学校读者我要写书评

暂无评论

Journal of Rare Earths 2018年第5期36卷 456-460页

作者： Honghui Li Xinghong Gong Yujin Chen Jianhua huang Yanfu Lin Zundu Luo yidong huang Key Laboratory of Optoelectronic Materials Chemistry and Physics Fujian Institute of Research on the Structure of Matter Chinese Academy of Sciences Fuzhou 350002 China Fujian Normal University Fuzhou 350007 China

A series of reddish orange phosphors Ba3Gd1-x（PO4）3：xSm^3＋（x = 0.02, 0.04 0.12） were prepared by the high-temperature solid-state reaction. X-ray powder diffraction （XRD） and diffuse reflectance and photoluminescence spectra were utilized to characterize the structure and spectral properties of the phosphors. The phosphors have strong absorption in the near-UV region. CIE chromaticity coordinates of the phosphors are located in the reddish orange region since the strongest emission band is around 598 nm and related to the 4G5/2 - 6H7/2 transition of Sm^3＋. Optimal concentration of Sm^3＋ in the phosphors is about 6.0 at%. The quantum yield of the Ba3Gdo.94（PO4）3：0.06Sm^3＋ under excitation at 403 nm is about 52.07%. Temperature dependent photoluminescence spectra of the Ba3Gdo.94（PO4）3：0.06Sm^3＋ were measured and the phosphor exhibits high thermal stability of emission. All the results show that the Ba3Gd（PO4）3：Sm^3＋ phosphor may be a potential red phosphor for near-UV based white LEDs.

关键词： Ba3Gd(PO4)3 Sm^3+ phosphor Photoluminescence Reddish orange Rare earths

Nonsuspended optomechanical crystal cavities using As_(2)S_(3) chalcogenide glass

在线全文

学校读者我要写书评

暂无评论

Photonics Research 2021年第5期9卷 893-898页

作者： RENDUO QI QIANCHENG XU NING WU KAIYU CUI WEI ZHANG yidong huang Beijing National Research Center for Information Science and Technology(BNRist) Beijing Innovation Center for Future ChipsElectronic Engineering DepartmentTsinghua UniversityBeijing 100084China Frontier Science Center for Quantum Information Beijing 100084China Beijing Academy of Quantum Information Sciences Beijing 100193China

An optomechanical crystal cavity with nonsuspended structure using As_(2)S_(3) material is proposed. The principle of mode confinement in the nonsuspended cavity is analyzed, and two different types of optical and acoustic defect modes are calculated through appropriate design of the cavity structure. An optomechanical coupling rate of 82.3 kHz is obtained in the proposed cavity, and the designed acoustic frequency is 3.44 GHz. The acoustic mode coupling between two nonsuspended optomechanical crystal cavities is also demonstrated, showing that the proposed cavity structure has great potential for realizing further optomechanical applications in multicavity systems.

关键词： suspended cavity crystal

Spontaneous emission rate enhancement of nano-structured silicon by surface plasmon polariton

在线全文

学校读者我要写书评

暂无评论

Frontiers of Optoelectronics 2012年第1期5卷 51-62页

作者： Xue FENG Fang LIU yidong huang State Key Laboratory of Integrated Optoelectronics Department of Electronic EngineeringTsinghua UniversityBeijing 100084China

Surface plasmon polariton （SPP） is an attractive candidate to improve internal quantum efficiency （QE） of spontaneous emission （SE） from nano-structured silicon （Si） including nano-porous silicon （NP-Si） and silicon nanocrystal （Si-NC）. Since the SPP resonant frequency of common metals, e.g., gold （Au）, silver （Ag）, copper （Cu）, and aluminum （A1）, is too high, the SPP resonance has to be engineered to match the luminescence from nano- structured Si. For this purpose, we have proposed and demonstrated three approaches including metal-rich Au（1-a）-SiO2（a） cermet SPP waveguide （WG）, com- pound layer structure WG and metallic grating. In this paper, those approaches are reviewed and discussed. According to the calculated results, such three methods could effectively enhance SE rate from NP-Si or Si-NCs and show potential in developing high efficiency Si based light sources with electric pump.

关键词： spontaneous emission (SE) silicon nanocrys-tal (Si-NC) surface plasmon polariton (SPP) Purcell effect

Continuous-wave operation of InAs/InP quantum dot tunable external-cavity laser grown by metal-organic chemical vapor deposition

在线全文

学校读者我要写书评

暂无评论

Chinese Physics B 2021年第1期30卷 568-571页

作者： Yan Wang Shuai Luo Haiming Ji Di Qu yidong huang Innovation Center of Advanced Optoelectronic Chip Institute for Electronics and Information Technology in TianjinTsinghua UniversityTianjin 300467China Tianjin H-Chip Technology Group Corporation Tianjin 300467China Department of Electronic Engineering Tsinghua UniversityBeijing 100084China Key Laboratory of Semiconductor Materials Science Institute of SemiconductorsChinese Academy of SciencesBeijing 100083China Center of Materials Science and Optoelectronics Engineering University of Chinese Academy of SciencesBeijing 100049China

We demonstrate high-performance broadband tunable external-cavity lasers(ECLs) with the metal-organic chemical vapor deposition(MOCVD) grown In As/In P quantum dots(QDs) structures. Without cavity facet coatings, the 3-d B spectral bandwidth of the Fabry–Perot(FP) laser is approximately 10.8 nm, while the tuning bandwidth of ECLs is 45 *** with the anti-reflection(AR)/high-reflection(HR) facet coating, a 92 nm bandwidth tuning range has been obtained with the wavelength covering from 1414 nm to 1506 nm. In most of the tuning range, the threshold current density is lower than 1.5 k A/cm2. The maximum output power of 6.5 m W was achieved under a 500 m A injection *** achievements mentioned above were obtained under continuous-wave(CW) mode at room temperature(RT).

关键词： InAs/InP quantum dot external-cavity laser continuous-wave operation metal-organic chemical vapor deposition