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Frontsand strong currents of the upper southeast Indian Ocean

Acta Oceanologica Sinica 2006年第2期25卷 1-24页

作者： he zhigang DONG Zhaoqian YUAN Xiaojun Department of Oceanography Xiamen University Xiamen 361005 China Polar Research Institute of China Shanghai 200136 China Lamont-Doherty Earth Observatory Columbia University Palisades New York NY 10964-800 USA

Hydrographic data, ADCP velocity and sea level anomaly derived from the satellite altimeter have been jointly analyzed in the southeast lndian Ocean. Results show the locations and orientations of the major oceanic fronts as well as the characteristics of the currents within these fronts in the area. Double subtropical fronts are observed in the section along 120°E, which conflicts with the frontal structure frequently observed before the North Subtropical Front （NSTF） and South Subtropical Front （SSTF） merge into a single STF between 110°-115°E. The Subantarctic Front （SAF）, influenced by the out-of-phase double eddies, runs across 48°S three times between 120° and 127°E. The surface current within the SAF is strengthened up to 105.4 cm/s by the geostrophic effect of these eddies. Furthermore eddies may cause the strong current to split up into two branches within the SAF. The SAF and the primary polar front （PFI） can be identified individually in the ADCP data with a separation distance of about 0.3° at latitude between 140° and 145°E, although they cannot be identified separately in the low-resolution hydrographic data. The different thcrmohaline characteristics of Circumpolar Deep Water （CDW） and Modified Circumpolar Deep Water （MCDW） result in the formation of Southern Antarctic Circumpolar Current Front （SACCF） in the southeast Indian Ocean. It consistently turns northward along the east flank of the Kerguclen Plateau after it runs through the Princess Elizabeth Trough and turns southward sharply north of 60°S with a little seasonal variations. It is shown that the locations and orientations of the SAK the primary PF and SACCF in the ACC of the southeast Indian Ocean can be identified more precisely by the current distribution derived from ADCP data than by hydrographic data, because these fronts are usually accompanied by strong currents. However, the locations and orientations of the STF and the secondary PF are more difficult to be identified through current data, since these two fronts are usually no

关键词： southeast Indian Ocean front jet

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Spring mesoscale high in the western South China Sea

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Acta Oceanologica Sinica 2013年第6期32卷 1-5页

作者： he zhigang ZHANG Yan WANG Dongxiao State Key Laboratory of Tropical Oceanography (LTO) South China Sea Institute of Oceanology Chinese Academy of Sciences College of Ocean and Earth Sciences Xiamen University South China Sea Marine Engineering Surveying Center South China Sea Branch State Oceanic Administration

A recurring spring mesoscale eddy in the western South China Sea （SCS） is studied using remote sensing data and historical in situ observations. The feature first appears east of the central Vietnam coast in Febru- ary as a high sea-level anomaly, grows rapidly to a well-developed anticyclonic eddy by March, matures in April, and decays in May. Besides the warm-core feature, it also has an inherent low-salinity property, so it is named ＂spring mesoscale high （SMH）＂. Though with clear interannual variation in terms of intensity and spatial coverage, the SMH always emerges in the region between ll0~E and l14~E and between 12~N and 16~N. The formation of SMH is ascribed to the combined effects of wind forcing and releasing of po- tential energy set up by winter monsoon. In particular, the wind-stress curl plays an important role in its development, maintenance, and dissipation.

关键词： spring western South China Sea warm eddy

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Fronts and surface zonal geostrophic current along 115°E in the southern Indian Ocean

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Acta Oceanologica Sinica 2010年第5期29卷 1-9页

作者： he zhigang DONG Zhaoqian South China Sea Institute of Oceanology Guangzhou 510301 Polar Research Institute of China Shanghai 200136

Altimeter and in situ data are used to estimate the mean surface zonal geostrophic current in the section along 115°E in the southern Indian Ocean,and the variation of strong currents in relation to the major fronts is studied.The results show that,in average,the flow in the core of Antarctic Circumpolar Current（ACC） along the section is composed of two parts,one corresponds to the jet of Subantarctic Front（SAF） and the other is the flow in the Polar Front Zone（PFZ）,with a westward flow between them.The mean surface zonal geostrophic current corresponding to the SAF is up to 49 cm · s^-1 at 46°S,which is the maximal velocity in the section.The eastward flow in the PFZ has a width of about 4.3 degrees in latitudes.The mean surface zonal geostrophic current corresponding to the Southern Antarctic Circumpolar Current Front（SACCF） is located at 59.7 °S with velocity less than 20 cm · s^-1.The location of zonal geostrophic jet corresponding to the SAF is quite stable during the study period.In contrast,the eastward jets in the PFZ exhibit various patterns,i.e.,the primary Polar Front（PF1） shows its strong meridional shift and the secondary Polar Front（PF2） does not always coincide with jet.The surface zonal geostrophic current corresponding to SAF has the significant periods of annual,semi-annual and four-month.The geostrophic current of the PFZ also shows significant periods of semi-annual and four-month,but is out of phase with the periods of the SAF,which results in no notable semi-annual and fourmonth periods in the surface zonal geostrophic current in the core of the ACC.In terms of annual cycle,the mean surface zonal geostrophic current in the core of the ACC shows its maximal velocity in June.

关键词： southern Indian Ocean,Antarctic Circumpolar Current,zonal geostrophic current,front

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考虑剪力滞和剪切变形效应的UHPC箱梁长期挠度分析

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铁道学报 2024年第1期46卷 172-182页

作者：马俊军蔺鹏臻刘应龙何志刚兰州交通大学土木工程学院甘肃兰州730070 兰州交通大学建筑与城市规划学院甘肃兰州730070

为准确计算UHPC箱梁在长期荷载作用下的挠度,基于剪切变形规律的截面翘曲位移函数,运用能量变分法建立考虑剪力滞、剪切变形效应以及UHPC收缩徐变效应的UHPC箱梁挠度计算控制微分方程,推导均布荷载和集中荷载作用下UHPC简支箱梁挠度计... 详细信息

为准确计算UHPC箱梁在长期荷载作用下的挠度,基于剪切变形规律的截面翘曲位移函数,运用能量变分法建立考虑剪力滞、剪切变形效应以及UHPC收缩徐变效应的UHPC箱梁挠度计算控制微分方程,推导均布荷载和集中荷载作用下UHPC简支箱梁挠度计算公式,并利用有限元模型计算结果对其正确性进行验证。通过数值算例分析不同效应、截面配筋以及材料特性对UHPC箱梁挠度计算的影响。结果表明:考虑剪切变形效应产生的挠度明显大于剪力滞效应;均布荷载和集中荷载作用下,仅考虑剪力滞和剪切效应后产生的简支梁跨中挠度相对于按初等梁理论计算的瞬时挠度分别增大了9.4%和10.9%,而同时考虑UHPC收缩徐变效应后分别增大了约1.5倍左右;截面配筋对箱梁挠度计算有一定的影响,两种荷载作用下,考虑配筋后计算得到的简支梁跨中瞬时和长期挠度分别是不考虑配筋时挠度的0.96倍和0.89倍;用UHPC材料代替普通混凝土材料可显著降低结构的短、长期挠度以及收缩徐变引起的挠度变化。提出的公式可为长期荷载作用下UHPC箱梁的挠度计算提供理论依据。

关键词：超高性能混凝土箱梁收缩徐变挠度简支梁

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Mesoscale oceanic eddies in the South China Sea from 1992 to 2012:evolution processes and statistical analysis

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Acta Oceanologica Sinica 2014年第11期33卷 36-47页

作者： DU Yunyan YI Jiawei WU Di he zhigang WANG Dongxiao LIANG Fuyuan State Key Laboratory of Resources and Environmental Information System Institute of Geographic Sciences and Natural Resources ResearchChinese Academy of Sciences State Key Laboratory of Tropical Oceanography (LTO) South China Sea Institute of OceanologyChinese Academy of Sciences College of Ocean and Earth Sciences Xiamen University Department of Geography Western Illinois University

Automated identification and tracking of mesoscale ocean eddies has recently become one research hotspot in physical oceanography. Several methods have been developed and applied to survey the general kinetic and geometric characteristics of the ocean eddies in the South China Sea（SCS）. However, very few studies attempt to examine eddies＇ internal evolution processes. In this study, we reported a hybrid method to trace eddies＇ propagation in the SCS based on their internal structures, which are characterized by eddy centers, footprint borders, and composite borders. Eddy identification and tracking results were represented by a GIS-based spatiotemporal model. Information on instant states, dynamic evolution processes, and events of disappearance, reappearance, split, and mergence is stored in a GIS database. Results were validated by comparing against the ten Dongsha Cyclonic Eddies（DCEs） and the three long-lived anticyclonic eddies（ACEs） in the northern SCS, which were reported in previous literature. Our study confirmed the development of these eddies. Furthermore, we found more DCE-like and ACE-like eddies in these areas from 2005 to 2012 in our database. Spatial distribution analysis of disappearing, reappearing, splitting, and merging activities shows that eddies in the SCS tend to cluster to the northwest of Luzon Island, southwest of Luzon Strait, and around the marginal sea of Vietnam. Kuroshio intrusions and the complex sea floor topography in these areas are the possible factors that lead to these spatial clusters.

关键词： mesoscale eddies,identification and tracking algorithms,spatiotemporal model,eddy splitting and merging,South China Sea

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乌衣红曲黄酒年份特征挥发性物质指纹图谱分析

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中国食品学报 2024年第2期24卷 260-268页

作者：苏昊李维新林晓姿何志刚梁璋成任香芸福建省农业科学院农产品加工研究所福州350003 农业农村部亚热带特色果蔬菌加工重点实验室福州350003 福建省农产品(食品)加工重点实验室福州350003

目的:建立乌衣红曲黄酒基酒挥发性成分指纹图谱,用于年份基酒酒龄的判别。方法:通过顶空固相微萃取-气相色谱联用质谱法(HS-SPME-GC-MS)分析不同陈酿时间的乌衣红曲黄酒中的挥发性成分,结合正交偏最小二乘法-判别分析(OPLS-DA)和Spearma... 详细信息

目的:建立乌衣红曲黄酒基酒挥发性成分指纹图谱,用于年份基酒酒龄的判别。方法:通过顶空固相微萃取-气相色谱联用质谱法(HS-SPME-GC-MS)分析不同陈酿时间的乌衣红曲黄酒中的挥发性成分,结合正交偏最小二乘法-判别分析(OPLS-DA)和Spearman相关性分析确定与年份相关的关键成分,用于构建年份基酒特征指纹图谱。结果:从不同年份的乌衣红曲黄酒中,共检出并定性挥发性成分122种,与陈酿时间显著相关的有20种(|r|>0.5),其中N-苯甲酰甘氨酸乙酯、6-庚烯酸乙酯、乙酸-2-乙基苯酯等8种与陈酿时间呈正相关关系,2-呋喃甲醇、辛酸、庚酸乙酯等12种与陈酿时间呈负相关关系。基于筛选的20种年份特征挥发性物质,构建了乌衣红曲黄酒基酒年份基酒指纹图谱。依据香气成分的OPLS-DA分析和指纹图谱数据信息将2~15年陈乌衣红曲基酒样品区分为青陈酒(2~4年)、中陈酒(5~9年)、老陈酒(10~15年)3个类别,并通过二次取样分析,验证所建图谱的可靠性。结论:GC-MS技术构建的挥发性成分指纹图谱可为乌衣红曲黄酒基酒品质评价及酒龄的识别提供基础数据。

关键词：指纹图谱挥发性物质基酒

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TSV阵列在温度循环下的晶格变化对电学性能影响的研究

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电子元件与材料 2024年第1期43卷 47-54页

作者：梁堃王月兴何志刚赵伟中国工程物理研究院电子工程研究所四川绵阳621999 中国工程物理研究院计量测试中心四川绵阳621999

针对TSV(Through Silicon Via,硅通孔)热机械可靠性较差且其结构特性变化对电学性能影响情况不明的问题,基于一种TSV阵列叉指电极对样品开展了-55~125℃的温度循环试验,测试了温循后阵列电极的电学性能与边界绝缘性能变化,跟踪测试了TS... 详细信息

针对TSV(Through Silicon Via,硅通孔)热机械可靠性较差且其结构特性变化对电学性能影响情况不明的问题,基于一种TSV阵列叉指电极对样品开展了-55~125℃的温度循环试验,测试了温循后阵列电极的电学性能与边界绝缘性能变化,跟踪测试了TSV铜柱的几何尺寸变化,对比分析了试验前后TSV结构的形貌和晶格特性等衍化规律。结果表明,温度循环载荷导致了TSV-Cu晶粒向上生长、铜柱体积变大、微观结构缺陷产生以及电学性能退化;此外,还定量地构建了晶格特性变化对TSV阵列电极电学性能影响的关系架构,具有一定的工程意义。

关键词： TSV阵列温度循环绝缘性能微观缺陷晶格特性变化

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一种面向地下管网环境的多机器人路径规划算法

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机器人 2024年第1期46卷 94-104,117页

作者：贺志刚毛剑琳杨邹张凯翔张书凡付丽霞昆明理工大学信息工程与自动化学院云南昆明650500 昆明理工大学机电工程学院云南昆明650500

多台机器人在地下管网执行任务时由于各通道只能允许一台机器人通过,可能因此出现大量的终点封堵和位置互锁问题,目前的路径规划算法无法有效解决此类问题。对此,本文提出一个具有中间点的动态优先级SIPP(安全间隔路径规划)算法,命名为D... 详细信息

多台机器人在地下管网执行任务时由于各通道只能允许一台机器人通过,可能因此出现大量的终点封堵和位置互锁问题,目前的路径规划算法无法有效解决此类问题。对此,本文提出一个具有中间点的动态优先级SIPP(安全间隔路径规划)算法,命名为DPiSIPP。首先引入确定性重新调度方法,使遭遇终点封堵问题的机器人能得到优先规划从而解除封堵。然后,对出现位置互锁问题的机器人添加一个中间点进行分段规划,以此直接解除互锁关系或将位置互锁问题转化为终点封堵问题来解决。实验结果表明,在地下管网场景下,DPiSIPP算法的求解成功率相较于Anytime SIPP算法、WSIPPd(具有重复状态的加权SIPP)算法和增强型CBS(基于冲突的搜索)算法最高分别可提升30%、30%和10%左右,这说明本文算法在求解能力上明显优于上述算法。

关键词：多机器人路径规划终点封堵位置互锁确定性重新调度中间点 SIPP(安全间隔路径规划)算法

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Progress of regional oceanography study associated with western boundary current in the South China Sea

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Chinese Science Bulletin 2013年第14期58卷 1205-1215页

作者： WANG DongXiao LIU QinYan XIE Qiang he zhigang ZHUANG Wei SHU YeQiang XIAO XianJun HONG Bo WU XiangYu SUI DanDan State Key Laboratory of Tropical Oceanography South China Sea Institute of Oceanology Chinese Academy of Sciences Sanya Institute of Deep-sea Science and Engineering Chinese Academy of Sciences College of Ocean and Earth Sciences Xiamen University National Climate Center Chinese Meteorological Administration Virginia Institute of Marine Science College of William and Mary National Marine Environmental Forecasting Center State Oceanic Administration

Recent progress of physical oceanography in the South China Sea (SCS) associated with the western boundary current (WBC) and eddies is reviewed in this paper. It includes Argo observations of the WBC, eddy detection in the WBC based on satellite images, cross-continental shelf exchange in the WBC, eddy-current interaction, interannual variability of the WBC, air-sea interaction, the SCS throughflow (SCSTF), among others. The WBC in the SCS is strong, and its structure, variability and dynamic processes on seasonal and interannual time scales are yet to be fully understood. In this paper, we summarize progresses on the variability of the WBC, eddy-current interaction, air-sea interaction, and the SCSTF achieved in the past few years. Firstly, using the drifting buoy observations, we point out that the WBC becomes stronger and narrower after it reaches the central Vietnam coast. The possible mechanisms influencing the ocean circulation in the northern SCS are discussed, and the dynamic mechanisms that induce the countercurrent in the region of northern branch of WBC in winter are also studied quantitatively using momentum balance. The geostropic component of the WBC was diagnosed using the ship observation along 18°N, and we found that the WBC changed significantly on interannual time scale. Secondly, using the ship observations, two anti-cyclonic eddies in the winter of 2003/2004 in the northern SCS, and three anti-cyclonic eddies in the summer of 2007 along 18°N were studied. The results show that the two anti-cyclonic eddies can propagate southwestward along the continental shelf at the speed of first Rossby wave (～0.1 ms-1 ) in winter, and the interaction between the three anti-cyclonic eddies in summer and the WBC in the SCS is preliminarily revealed. Eddies on the continental shelf of northern SCS propagated southeastward with a maximum speed of 0.09 ms-1 , and those to the east of Vietnam coast had the largest kinetic energy, both of which imply strong interaction between eddy activity and WBC in the SCS. Th

关键词：南海区域物理海洋学西边界流中国南海南海北部大陆架海气相互作用年际时间尺度 Rossby波

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软塑/流塑软弱土场地光伏支架基础不均匀沉降问题及解决措施

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太阳能 2024年第2期 109-114页

作者：阳小超陈少雄何志刚中国能源建设集团湖南省电力设计院有限公司长沙410007

针对光伏支架在软塑/流塑软弱土场地应用时存在的一些问题,提出一种半预制轻型光伏支架基础形式,旨在克服常规基础因受场地限制不适用,或施工难度大、建设成本较高的问题。通过沉降计算分析,在满足软塑/流塑软弱土地基承载力及基础整体... 详细信息

针对光伏支架在软塑/流塑软弱土场地应用时存在的一些问题,提出一种半预制轻型光伏支架基础形式,旨在克服常规基础因受场地限制不适用,或施工难度大、建设成本较高的问题。通过沉降计算分析,在满足软塑/流塑软弱土地基承载力及基础整体稳定性的前提下,该半预制轻型光伏支架基础可以实现安装支架基础上方设施后,不增加基础底面附加压力,从根本上解决了光伏电站建设后场地地基的后续沉降问题。

关键词：光伏支架基础半预制软弱土软塑/流塑不均匀沉降

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