检索结果-南通市图书馆

Production of ^(87)Rb Bose-Einstein Condensate in an Asymmetric Crossed Optical Dipole Trap

在线全文

学校读者我要写书评

暂无评论

Chinese Physics Letters 2021年第10期38卷 12-16页

作者： Zhu Ma chengyin han Xunda Jiang Ruihuan Fang Yuxiang Qiu Minhua Zhao Jiahao Huang Bo Lu Chaohong Lee Guangdong Provincial Key Laboratory of Quantum Metrology and Sensing&School of Physics and Astronomy Sun Yat-Sen University(Zhuhai Campus)State Key Laboratory of Optoelectronic Materials and TechnologiesSun Yat-Sen University(Guangzhou Campus)Zhuhai 519082China State Key Laboratory of Optoelectronic Materials and Technologies Sun Yat-Sen University(Guangzhou Campus)Guangzhou 510275China

We report the production of ^(87)Rb Bose–Einstein condensate in an asymmetric crossed optical dipole trap(ACODT)without the need of an additional dimple *** our experiment,the ACODT is formed by two laser beams with different radii to achieve efficient capture and rapid evaporation of laser cooled *** to the cooling procedure in a magnetic trap,the atoms are firstly laser cooled and then directly loaded into an ACODT without the pre-evaporative cooling *** order to determine the optimal parameters for evaporation cooling,we optimize the power ratio of the two beams and the evaporation time to maximize the final atom number left in the *** loading about 6×10^(5) laser cooled atoms in the ACODT,we obtain a pure Bose–Einstein condensate with about 1.4×10^(4) atoms after 19 s ***,we demonstrate that the fringe-type noises in optical density distributions can be reduced via principal component analysis,which correspondingly improves the reliability of temperature measurement.

关键词： measurement Einstein Bose

Magnetic field stabilization system designed for the cold-atom coherent population-trapping clock

在线全文

学校读者我要写书评

暂无评论

Chinese Optics Letters 2024年第8期22卷 7-12页

作者： Chang Zhan Zhu Ma Jiatao Wu Maojie Li chengyin han Bo Lu Chaohong Lee Laboratory of Quantum Engineering and Quantum Metrology School of Physics and AstronomySun Yat-sen UniversityZhuhai 519082China Institute of Quantum Precision Measurement State Key Laboratory of Radio Frequency Heterogeneous IntegrationShenzhen UniversityShenzhen 518060China College of Physics and Optoelectronic Engineering Shenzhen UniversityShenzhen 518060China Quantum Science Center of Guangdong-Hong Kong-Macao Greater Bay Area Shenzhen 518045China

Accurate control of magnetic fields is crucial for cold-atom experiments,often necessitating custom-designed control systems due to limitations in commercially available power ***,we demonstrate precise and flexible control of a static magnetic field by employing a field-programmable gate array and a feedback *** setup enables us to maintain exceptionally stable current with a fractional stability of 1 ppm within 30 *** error signal of the feedback loop exhibited a noise level of 10^(-5)A·Hz^(-1/2)for control bandwidths below 10 k *** this precise magnetic field control system,we investigate the second-order Zeeman shift in the context of cold-atom coherent population-trapping (CPT)*** analysis reveals the second-order Zeeman coefficient to be 574.21 Hz/G^(2),with an uncertainty of 1.36 Hz/G^(2).Consequently,the magnetic field stabilization system we developed allows us to achieve a second-order Zeeman shift below10^(-14),surpassing the long-term stability of current cold-atom CPT clocks.

关键词： cold-atom coherent population-trapping clock Zeeman coefficient magnetic field stabilization system

在线全文

学校读者我要写书评

暂无评论

除险加固水闸的消能防冲措施

水利水电科技进展 2017年第4期37卷 42-46,62页

作者：韩成银刘红军傅宗甫崔贞江苏省洪泽湖大堤高良涧闸加固工程建设处江苏淮安223199 河海大学水利水电学院江苏南京210098

基于某除险加固工程水力学模型试验,通过对闸下水流流态、流速分布、特征断面垂向最大平均流速以及冲刷特性的观测,分析了设计方案条件闸下水流流态恶化及冲刷严重的原因,即下游翼墙加固改变了水流的边界条件,导致出闸水流受到边界挤压... 详细信息

基于某除险加固工程水力学模型试验,通过对闸下水流流态、流速分布、特征断面垂向最大平均流速以及冲刷特性的观测,分析了设计方案条件闸下水流流态恶化及冲刷严重的原因,即下游翼墙加固改变了水流的边界条件,导致出闸水流受到边界挤压而主流集中,局部流速增大,冲刷加剧。通过不同消能防冲方案的试验比较,提出了利用分隔墩消除出闸水流集中的现象;分隔墩消除了主流受边界挤压现象,起到了改善闸下水流流态,均化闸下水流流速分布,降低河床最大流速,减轻闸下冲刷的作用,且体型结构简单,易于施工。

关键词：除险加固水闸消能防冲分隔墩

在线全文

学校读者我要写书评

暂无评论

钢板桩围堰在高良涧闸加固改造中的应用

水利建设与管理 2016年第10期36卷 67-72页

作者：孙超君高山韩成银江苏省秦淮河水利工程管理处江苏南京210022 江苏省分淮入沂整治工程建设管理局江苏扬州225002 江苏省水利工程建设局江苏南京210029 江苏省灌溉总渠管理处江苏淮安22300

在高良涧闸加固改造工程实施中,为拆除重建下游消能设施,需在下游填筑施工围堰。本文根据工程场地的具体情况,综合分析土围堰和钢板桩围堰两种设计方案及特点,选用双排钢板桩围堰方案,为工程的顺利实施提供了保障,也为今后同类工程提供... 详细信息

在高良涧闸加固改造工程实施中,为拆除重建下游消能设施,需在下游填筑施工围堰。本文根据工程场地的具体情况,综合分析土围堰和钢板桩围堰两种设计方案及特点,选用双排钢板桩围堰方案,为工程的顺利实施提供了保障,也为今后同类工程提供可借鉴的经验。

关键词：水闸加固改造施工围堰双排钢板桩

Recent advances in exploring new blood-based biomarkers for the early diagnosis of gastric cancer

在线全文

学校读者我要写书评

暂无评论

Science China Chemistry 2025年第1期 35-45页

作者： Xinyu Peng Qian Ma Da han School of Life Science Shanghai University Institute of Molecular Medicine Shanghai Key Laboratory for Nucleic Acid Chemistry and Nanomedicine State Key Laboratory of Oncogenes and Related Genes Renji Hospital School of Medicine Shanghai Jiao Tong University Department of Research and Development Intellinosis Biotechnologies Co.Ltd.

Gastric cancer(GC) is a prevalent and lethal malignancy worldwide, and the 5-year survival rate is less than 30%. The absence of distinctive symptoms often leads to late-stage diagnosis, contributing to a grim prognosis. Early detection is pivotal for improving the survival rates and outcomes of GC patients. Traditional diagnostic methods, including gastroscopy and histopathological examination, are restricted in the early diagnosis of GC. Conventional protein biomarkers, such as carcinoembryonic antigen(CEA), carbohydrate antigen 19-9(CA19-9), and carbohydrate antigen 72-4(CA72-4), exhibit insufficient sensitivity and specificity for GC screening, which diminishes their clinical value. Recently, novel circulating biomarkers, such as circulating tumor cells(CTCs), circulating tumor cell DNA(ct DNA), and circulating free RNA(cf RNA), have emerged as promising candidates in the burgeoning field of liquid biopsy due to their superior sensitivity and specificity. This review focuses on the latest research on blood-based biomarkers for GC diagnosis and examines the clinical potentials and challenges associated with these emerging biomarkers.

关键词：

同方期刊数据库

基于玻色凝聚^(87)Rb原子气体相位Ramsey干涉的磁场探测

在线全文

学校读者我要写书评

暂无评论

深圳大学学报（理工版） 2024年第5期41卷 517-523页

作者：吴嘉涛方瑞环韩成银马翥詹畅李懋捷黄嘉豪鹿博李朝红中山大学物理与天文学院量子工程与精密测量实验室广东珠海519082 深圳大学量子精密测量研究所物理与光电工程学院射频异质异构集成全国重点实验室广东深圳518060 粤港澳大湾区量子科学中心广东深圳518045

基于玻色凝聚原子气体的磁场探测可兼顾高灵敏度和高空间分辨率.利用一维光晶格中玻色凝聚^(87)Rb原子气体F=1,m_(F)=1→F=2,m_(F)=-1(F为原子总角动量的量子数,m_(F)为F能级的磁量子数)的双光子跃迁,已实现基于相位Ramsey干涉的精密磁... 详细信息

基于玻色凝聚原子气体的磁场探测可兼顾高灵敏度和高空间分辨率.利用一维光晶格中玻色凝聚^(87)Rb原子气体F=1,m_(F)=1→F=2,m_(F)=-1(F为原子总角动量的量子数,m_(F)为F能级的磁量子数)的双光子跃迁,已实现基于相位Ramsey干涉的精密磁场探测.本研究利用交叉光阱中玻色凝聚^(87)Rb原子气体F=1,m_(F)=1→F=2,m_(F)=0的单光子跃迁,实验研究了频域Ramsey干涉、时域Ramsey干涉及相位Ramsey干涉,并基于相位Ramsey干涉评估了静态磁场测量的灵敏度和空间分辨率.通过对比上述3种Ramsey干涉的实验结果,发现相位Ramsey干涉可有效避免频域Ramsey干涉条纹的畸变和时域Ramsey干涉的退相干效应,从而提高静态磁场测量的灵敏度和准确度.在无磁屏蔽环境中,利用体积为(1.31±0.03)×10^(-9)cm^(3)的玻色凝聚^(87)Rb原子气体,获得了130 nT/√Hz的灵敏度,通过压缩原子气体制备时间和提高信号积累时间,灵敏度有望得到进一步提升.

关键词：光学 Ramsey光谱光学泵浦原子激光冷却与囚禁玻色凝聚原子气体精密磁场探测

Crystallization Modulation and Holistic Passivation Enables Efficient Two‑Terminal Perovskite/CuIn(Ga)Se_(2)Tandem Solar Cells

在线全文

学校读者我要写书评

暂无评论

Nano-Micro Letters 2025年第1期17卷 205-215页

作者： Cong Geng Kuanxiang Zhang Changhua Wang Chung Hsien Wu Jiwen Jiang Fei Long Liyuan han Qifeng han Yi‑Bing Cheng Yong Peng State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of TechnologyWuhan 430070People’s Republic of China Triumph Photovoltaic Materials Co. Ltd.No.1001 Yannan AvenueHigh‑Tech Development DistrictBengbuAnhui 233000People’s Republic of China College of Materials Science and Engineering Guilin University of TechnologyGuilin 541004People’s Republic of China State Key Laboratory of Metal Matrix Composites Shanghai Jiao Tong UniversityShanghai 200240People’s Republic of China

Two-terminal(2-T)perovskite(PVK)/CuIn(Ga)Se_(2)(CIGS)tandem solar cells(TSCs)have been considered as an ideal tandem cell because of their best bandgap matching regarding to Shockley–Queisser(S–Q)***,the nature of the irregular rough morphology of commercial CIGS prevents people from improving tandem device *** this paper,D-homoserine lactone hydrochloride is proven to improve coverage of PVK materials on irregular rough CIGS surfaces and also passivate bulk defects by modulating the growth of PVK *** addition,the minority carriers near the PVK/C60 interface and the incompletely passivated trap states caused interface recombination.A surface reconstruction with 2-thiopheneethylammonium iodide and N,N-dimethylformamide assisted passivates the defect sites located at the surface and grain ***,LiF is used to create this field effect,repelling hole carriers away from the PVK and C60 interface and thus reducing *** a result,a 2-T PVK/CIGS tandem yielded a power conversion efficiency of 24.6%(0.16 cm^(2)),one of the highest results for 2-T PVK/CIGS TSCs to our *** validation underscores the potential of our methodology in achieving superior performance in PVK/CIGS tandem solar cells.

关键词： PVK/CIGS TSCs Irregular rough surfaces Modulating the growth PVK/C60 interface recombination

Potential role of tanycyte-derived neurogenesis in Alzheimer's disease

在线全文

学校读者我要写书评

暂无评论

Neural Regeneration Research 2025年第6期20卷 1599-1612页

作者： Guibo Qi han Tang Jianian Hu Siying Kang Song Qin Department of Anatomy Histologyand EmbryologySchool of Basic Medical SciencesFudan UniversityShanghaiChina State Key Laboratory of Medical Neurobiology and MOE Frontiers Center for Brain Science Fudan UniversityShanghaiChina

Tanycytes, specialized ependymal cells located in the hypothalamus, play a crucial role in the generation of new neurons that contribute to the neural circuits responsible for regulating the systemic energy balance. The precise coordination of the gene networks controlling neurogenesis in naive and mature tanycytes is essential for maintaining homeostasis in adulthood. However, our understanding of the molecular mechanisms and signaling pathways that govern the proliferation and differentiation of tanycytes into neurons remains limited. This article aims to review the recent advancements in research into the mechanisms and functions of tanycyte-derived neurogenesis. Studies employing lineage-tracing techniques have revealed that the neurogenesis specifically originating from tanycytes in the hypothalamus has a compensatory role in neuronal loss and helps maintain energy homeostasis during metabolic diseases. Intriguingly,metabolic disorders are considered early biomarkers of Alzheimer's disease. Furthermore,the neurogenic potential of tanycytes and the state of newborn neurons derived from tanycytes heavily depend on the maintenance of mild microenvironments, which may be disrupted in Alzheimer's disease due to the impaired blood–brain barrier ***, the specific alterations and regulatory mechanisms governing tanycyte-derived neurogenesis in Alzheimer's disease remain unclear. Accumulating evidence suggests that tanycyte-derived neurogenesis might be impaired in Alzheimer's disease, exacerbating neurodegeneration. Confirming this hypothesis, however, poses a challenge because of the lack of long-term tracing and nucleus-specific analyses of newborn neurons in the hypothalamus of patients with Alzheimer's disease. Further research into the molecular mechanisms underlying tanycyte-derived neurogenesis holds promise for identifying small molecules capable of restoring tanycyte proliferation in neurodegenerative diseases. This line of investigation could pro

关键词： Alzheimer's disease blood–brain barrier ependymoglial cells hypothalamus metabolic diseases neural stem cells neurogenesis neuroinflammatory diseases neurons tanycyte

Development and validation of a TaqMan^(TM) fluorescent quantitative real-time PCR assay for the rapid detection of Edwardsiella tarda

在线全文

学校读者我要写书评

暂无评论

Acta Oceanologica Sinica 2012年第4期31卷 140-148页

作者： XIE Guosi HUANG Jie ZhanG Qingli han Nana SHI chengyin WANG Xiuhua Key Laboratory of Marine Fishery Resources Sustainable Utilization Ministry of AgricultureYellow Sea Fisheries Research InstituteChinese Academy of Fishery SciencesQingdao 266071China College of Fisheries and Life Science Shanghai Ocean UniversityShanghai 201306China

Edwardsiella tarda is one of the most important emerging pathogens in tile global aquaculture industries. As such, an accurate diagnosis and quantitative analytical methods are urgently needed for this bacterium. In this study, primers and a TaqMan probe specific to the conservative sequences of the 16S rRNA gene of E. tarda were designed. The concentration of primers and TaqMan probe were optimized to 200 nmol/L and 120 nmol/L, respectively. The detection sensitivity of the FQ- PCR assay was determined to be as low as five copies of the target sequence per reaction using the pGEM-16S rDNA recombinant plasmid as a template, which was 100 times more sensitive than conventional PCR. A standard curve by plotting the threshold cycle values （y） against the common logarithmic copies （logl0n~ as x; n~ is copy number） of pGEM-16S rDNA was generated. The results of intra- and inter-assay variability tests demonstrate that the established FQ-PCR method was highly reproducible. The assay was specific for E. tarda as it showed that there was no cross-reactivity to eight additional bacterial pathogen strains in aquaculture. Thus, the FQ-PCR assay has the potential for diagnostic purposes and for other applications, especially for the rapid detection and quantification of low-grade E. tarda infections.

关键词： Edwardsiella tarda TaqMan real-time PCR detection 16S rDNA