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Counter-Wind Deep Current in the Northern Beibu Gulf in Boreal Winter

Journal of Ocean University of China 2019年第1期18卷 57-68页

作者： gao jingsong WU Guidan NGUYEN Kim-Cuong SHI Maochong Key Laboratory of Environment Change and Resources Use in Beibu Gulf Ministry of Education Naning Normal University Guangxi Coastal Key laboratory of Marine Environment Science Guangxi Academy of Sciences Guangxi Key Laboratory of Marine Disaster in the Beibu Gulf Qinzhou University VNU University of Science Ocean University of China

The Beibu Gulf is at an important geographical location and rich in gas, oil and biological resources. The observed currents showed that the current in the upper layer was opposite to that in the lower layer in boreal winter in the northern Beibu Gulf and it was northeastward in the lower layer. This northeastward current was reproduced by a 3 D baroclinic model in this study. It's found that the counter-wind deep current(referred to as ‘CWDC' hereinafter) strengthened from September to November but weakened from December to the following February. A closed meridional circulation in vertical direction was found in the northern Beibu Gulf, including CWDC, surface southwestward current, an upwelling, and a downwelling. The temporal variation process of the meridional circulation was similar to that of CWDC, with strength and range stronger in November and December than in other four months. Similar to the variation process of CWDC, the monsoon wind changed from weak easterly wind in September to strong northeasterly wind in November and December, and it was transformed into weak southeasterly wind in February again. The sensitive experiments showed that CWDC and the meridional circulation were controlled by the monsoon wind and were adjusted by heat flux-and tide-induced mixing, respectively. According to the momentum balance equation, it can be revealed the counter-wind deep current is a compensation current which is induced by the surface elevation gradient balanced by the Coriolis force, vertical diffusion and baroclinic pressure gradient.

关键词： Beibu Gulf numerical model(POM) counter-wind deep current(CWDC) monsoon wind momentum balance equation

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Responses of the circulation and water mass in the Beibu Gulf to the seasonal forcing regimes

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Acta Oceanologica Sinica 2014年第7期33卷 1-11页

作者： gao jingsong SHI Maochong CHEN Bo GUO Peifang ZHAO Dongliang Ocean University of China Guangxi Key Laboratory of Marine Environmental Science Guangxi Academy of Sciences

In the past 20 a, the gulf-scale circulation in the Beibu Gulf has been commonly accepted to be driven by a wind stress or density gradient. However, using three sensitive experiments based on a three-dimensional baroclinic model that was verified by observations, the formation mechanisms were revealed： the circula- tion in the northern Beibu Gulf was triggered by the monsoon wind throughout a year; whereas the southern gulf circulation was driven by the monsoon wind and South China Sea （SCS） circulation in winter and sum- mer, respectively. The force of heat flux and tidal harmonics had a strong effect on the circulation strength and range, as well as the local circulation structures, but these factors did not influence the major circulation structure in the Beibu Gulf. On the other hand, the Beibu Gulf Cold Water Mass （BGCWM） would disappear without the force of heat flux because the seasonal thermocline layer was generated by the input of heat so that the vertical mixing between the upper hot water and lower cold water was blocked. In addition, the wind-induced cyclonic gyre in the northern gulf was favorable to the existence of the BGCWM. However, the coverage area of the BGCWM was increased slightly without the force of the tidal harmonics. When the model was driven by the monthly averaged surface forcing, the circulation structure was changed to some extent, and the coverage area of the BGCWM almost extended outwards 100%, implying the circulation and water mass in the Beibu Gulf had strong responses to the temporal resolution of the surface forces.

关键词： Princeton ocean model (POM) Beibu Gulf (Gulf of Tonkin) circulation cold water mass response

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Germanium nanopyramid arrays showing near-100% absorption in the visible regime

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Nano Research 2015年第7期8卷 2216-2222页

作者： Qi Han Yongqi Fu Lei Jin Jingjing Zhao Zongwei Xu Fengzhou Fang jingsong gao Weixing Yu School of Physical Electronics University of Electronic Science and Technology of China Chengdu 610054 China Changchun Institute of Optics Fine Mechanics and Physics Chinese Academy of Sciences Changchun 130033 China Key Laboratory of Precision Measuring Technology & Instruments Centre of Micro-Nano Manufacturing Technology Tianjin University Tianjin 300072 China Institute of Micro & Nano Optics College of Optoelectronic Engineering Shenzhen University Shenzhen 518060 China

Solar energy is regarded as one of the most plentiful sources of renewable energy. An extraordinary light-harvesting property of a germanium periodic nanopyramid array is reported in this Letter. Both our theoretical and experimental results demonstrate that the nanopyramid array can achieve perfect broadband absorption from 500- to 800-nm wavelength. Especially in the visible regime, the experimentally measured absorption can even reach 100%. Further analyses reveal that the intrinsic antireflection effect and slow-light waveguide mode play an important role in the ultra-high absorption, which is helpful for the research and development of photovoltaic devices.

关键词： nanopyramid array,absorption coefficient,antireflection coatings,slow-light mode

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3D collagen matrices modulate the transcriptional trajectory of bone marrow hematopoietic progenitors into macrophage lineage commitment

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Bioactive Materials 2022年第4期7卷 255-268页

作者： Pan Zhang Linmu Xu jingsong gao Guangkui Xu Yanping Song Guang Li Jingjing Ren Yunjie Zhang Cheng Yang Yu Zhang Ruiheng Xie Nu Zhang Hui Yang School of Life Sciences Northwestern Polytechnical UniversityXi’anShaanxi710072China Research Center of Special Environmental Biomechanics&Medical Engineering Northwestern Polytechnical UniversityXi’anShaanxi710072China School of Aerospace Engineering Xi’an Jiaotong UniversityXi’anShaanxi710049China Institute of Hematology Xi’an Central HospitalXi’anShaanxi710003China School of Computer Science Northwestern Polytechnical UniversityXi’anShaanxi710072China Department of Computer and Information Science University of DelawareNewarkDEUSA

Physical signals provided by the extracellular matrix(ECM)are key microenvironmental parameters for the fate decision of hematopoietic stem and progenitor cells(HSPC)in bone *** into cell-ECM interactions are critical for advancing HSC-based tissue ***,we employed collagen hydrogels and collagen-alginate hydrogels of defined stiffness to study the behaviors of hematopoietic progenitor cells(HPCs).Three-dimensional(3D)collagen hydrogels with a stiffness of 45 Pa were found to promote HPC maintenance and colony formation of monocyte/macrophage *** single-cell RNA sequencing(scRNA-seq),we also characterized the comprehensive transcriptional profiles of cells randomly selected from two-dimensional(2D)and 3D hydrogels.A distinct maturation trajectory from HPCs into macrophages within the 3D microenvironment was revealed by these results.3D-derived macrophages expressed high levels of various cytokines and chemokines,such as Saa3,Cxcl2,Socs3 and ***,enhanced communication between 3D-macrophages and other hematopoietic clusters based on ligand-repair interactions was demonstrated through bioinformatic *** research underlines the regulatory role of matrix-dimensionality in HPC differentiation and therefore probably be applied to the generation of specialized macrophages.

关键词： Hematopoietic progenitor cells Collagen Matrix-dimensionality Macrophages

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Optical free induction decay emission carrying orbit angular momentum from ionic nitrogen enabled by multiple-photon resonance

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Chinese Optics Letters 2024年第6期22卷 177-181页

作者： Kailu Wang Haicheng Mei jingsong gao Liang Xu Hongbing Jiang Yi Liu Shanghai Key Laboratory of Modern Optical System University of Shanghai for Science and TechnologyShanghai 200093China State Key Laboratory for Mesoscopic Physics School of PhysicsPeking UniversityBeijing 100871China CAS Center for Excellence in Ultra-intense Laser Science Shanghai 201800China

Coherent optical emission of free induction decay (FID) excited by the multiple-photon resonance has been recently observed in nitrogen ions produced by intense femtosecond laser *** we report that orbit angular momentum (OAM) of the pump laser pulses can be transferred to the much longer pulsed free induction decay emission with the OAM *** was found that when the pump laser frequency approaches the fraction of the 391.4 nm emission (ν_(0)/5),an FID emission is emitted whereas its topological charge was identified to be 5 times of the pump *** to the reduced laser intensity with a vortex pump compared to the conventional Gaussian beam,the resonant pump laser wavelength presents a redshift,and the FID signal is significantly weaker.

关键词： air lasing orbital angular momentum free induction decay femtosecond pulses photoionization

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Ultrawide-band optically transparent antidiffraction metamaterial absorber with a Thiessen-polygon metal-mesh shielding layer

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Photonics Research 2023年第7期11卷 1354-1363页

作者： NAITAO SONG QIAO SUN SU XU DONGZHI SHAN YANG TANG XIAOXI TIAN NIANXI XU jingsong gao Key Laboratory of Optical System Advanced Manufacturing Technology Changchun Institute of OpticsFine Mechanics and PhysicsChinese Academy of SciencesChangchun 130033China State Key Laboratory of Applied Optics Changchun Institute of OpticsFine Mechanics and PhysicsChinese Academy of SciencesChangchun 130033China College of Da Heng University of Chinese Academy of SciencesBeijing 100049China State Key Laboratory of Integrated Optoelectronics College of Electronic Science and EngineeringJilin UniversityChangchun 130012China Jilin Provincial Key Laboratory of Advanced Optoelectronic Equipment and Instrument Manufacturing Technology Changchun 130033China

Transparent absorbers, with a functional integration of broadband electromagnetic shielding, microwave camouflage,and optical transparency, have attracted increasing attention in the past decades. Metal mesh, an artificial, optically transparent, conducting material composed of periodic metallic gratings, is the optimal choice for the microwave shielding layer of transparent absorbers because of its excellent compatibility between high transparency and low resistance. However, the micrometer-level periodicity of metallic grating concentrates the diffraction of light, which degrades the imaging quality of cameras and sensors in common. In this study, we report on a generalized Thiessenpolygon-randomization method that prevents the concentration of the diffraction of light in periodic metallic grating and demonstrate an ultrawide-band optically transparent diffraction-immune metamaterial absorber. The absorber is constructed with a multilayer indium-tin-oxide-based metasurface and a Thiessen-polygon-randomized metal-mesh reflector. The lossy metasurface provides multimode absorption, whereas the Thiessen-polygon randomization prevents the concentration of the diffraction of light. The practical sample achieves a 10 dB absorptivity and shielding effectiveness over a range of 8–26.5 GHz, and the optical transparency is also preserved over the entire visible and near-infrared regions. The point spread function and field of view are both improved by using the antidiffraction absorber. Our study paves the way for the application of optically transparent electromagnetic devices, display, and optoelectronic integration in a more practical stage. ? 2023 Chinese Laser Press.

关键词： absorber transparent polygon

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胎盘植入性疾病的围产期管理

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中国医师杂志 2023年第9期25卷 1301-1305页

作者：胡惠英高劲松中国医学科学院、北京协和医学院、北京协和医院妇产科国家妇产疾病临床医学研究中心北京100730

胎盘植入性疾病(PAS)已经成为产后出血和围产期子宫切除的主要原因。胎盘植入手术风险大,做好高危患者PAS的排查和诊断,对重度PAS患者及时转诊,选择合适的手术时机,组建多学科团队,做好可靠的术前评估和充分的术前准备,制定合理的手术... 详细信息

胎盘植入性疾病(PAS)已经成为产后出血和围产期子宫切除的主要原因。胎盘植入手术风险大,做好高危患者PAS的排查和诊断,对重度PAS患者及时转诊,选择合适的手术时机,组建多学科团队,做好可靠的术前评估和充分的术前准备,制定合理的手术方案和抢救预案,并由有经验的医生实施手术,从而将风险降至最低。对患者临床诊治的规范化管理,将有助于改善妊娠结局,降低子宫切除率,减少孕产妇严重并发症率和死亡率。

关键词：侵入性胎盘围产期疾病管理

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钦州湾三墩作业区排污阈值的数值模拟研究

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广西科学 2021年第2期28卷 167-173页

作者：裴木凤高劲松国家海洋局北海海洋环境监测中心站广西北海536000 南宁师范大学北部湾环境演变与资源利用教育部重点实验室广西南宁530001

排污容量的研究对海洋生态环境保护有重要意义。随着钦州湾茅尾海污染呈逐渐严重趋势,为改善水质状况,钦州市将排污口外迁至三墩作业区,因此,研究该区域的排污阈值可为决策提供科学依据。本研究通过一阶降解系数的物质对流扩散模型模拟... 详细信息

排污容量的研究对海洋生态环境保护有重要意义。随着钦州湾茅尾海污染呈逐渐严重趋势,为改善水质状况,钦州市将排污口外迁至三墩作业区,因此,研究该区域的排污阈值可为决策提供科学依据。本研究通过一阶降解系数的物质对流扩散模型模拟钦州湾三墩区不同排污口的扩散情景,选出最优排污口并计算排污阈值。研究表明:不同排污口排放的物质扩散方向基本为SW NE向,同时西南端排污口的污染物扩散范围小于东北端排污口的污染物扩散范围,因此三墩作业区的最优排污口位置位于西南端(21.601101°N,108.670364°E);COD Cr、TN和TP分别执行≤60 mg/L、≤40 mg/L和≤0.5 mg/L标准时,相应的排污阈值依次为76845.25,1581.7和150.2 t/a。

关键词：钦州湾三墩作业区数值模型(EFDC) 排污阈值污染物

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面向静态稳定的可变形助行外骨骼机器人运动规划

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仪器仪表学报 2020年第1期41卷 92-99页

作者：郑天骄朱延河高靖松李莫赵杰哈尔滨工业大学机器人技术与系统国家重点实验室哈尔滨150001

助行外骨骼机器人能够辅助下肢运动障碍人群站立行走,但相较于电动轮椅在移动距离与移动速度上存在不足。因此设计了一款可变形助行外骨骼机器人,具有助行外骨骼与电动轮椅两种相互独立可转换的形态。针对可变形助行外骨骼机器人变形与... 详细信息

助行外骨骼机器人能够辅助下肢运动障碍人群站立行走,但相较于电动轮椅在移动距离与移动速度上存在不足。因此设计了一款可变形助行外骨骼机器人,具有助行外骨骼与电动轮椅两种相互独立可转换的形态。针对可变形助行外骨骼机器人变形与行走两种运动过程,研究面向系统静态稳定的运动规划。描述了可变形助行外骨骼机器人的变形原理;提出了基于系统重心投影点位置的运动规划方法,分析了外骨骼机器人在变形与行走过程的静态稳定性;完成了健康受试者穿戴外骨骼的变形与行走运动实验,实验中系统的稳定裕度分别大于54 mm和20 mm。实验结果表明,利用面向静态稳定的运动规划方法,可变形助行外骨骼机器人能够实现稳定可靠的变形切换与连续行走。

关键词：外骨骼机器人运动规划稳定性分析可变形结构

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钦州湾溢油数值模块及其应用

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海洋湖沼通报 2019年第2期 24-31页

作者：吴桂丹朱冬琳高劲松广西科学院广西近海海洋环境科学重点实验室广西南宁530007 钦州学院海洋学院广西钦州535011

本文应用水动力模型及溢油模块对代表性风况下钦州湾金鼓江的溢油事故进行情景模拟,且水动力模型结果与实测潮位和实测潮流吻合较好。低潮时发生溢油,不同风况下油粒子在5.5-8.5h后漂到金鼓江上游养殖区。高潮时发生溢油,油粒子在不同... 详细信息

本文应用水动力模型及溢油模块对代表性风况下钦州湾金鼓江的溢油事故进行情景模拟,且水动力模型结果与实测潮位和实测潮流吻合较好。低潮时发生溢油,不同风况下油粒子在5.5-8.5h后漂到金鼓江上游养殖区。高潮时发生溢油,油粒子在不同风况下漂移轨迹差别较大,例如无风时油粒子在钦州湾颈和三墩外海附近往复运动,而南风3.3m/s工况下油粒子将最终影响大榄坪港区的东南端。另外,高风速下不利风向会缩减油膜抵达敏感区的时间,同时风速越大,蒸发越快。因此风场对溢油模型有重要意义,今后将在精细化WRF模型基础上优化溢油模型并构建溢油决策系统,为地方经济发展和海洋环境保护提供科技支撑。

关键词：金鼓江 MIKE模型溢油模块潮流季风

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