A Study of Bioavailibility of Phosphorus in Estuaarine Suspended Matters and Marine Sediments

本文通过对河口悬浮物、海洋近岸表层沉积物样品的藻类生物分析 和化学形态分析，以及九龙江口的现场调查，对样品中磷的生物可利用性 进行比较全面的研究。 利用九龙江口、黄河口悬浮物和厦门湾、泉州湾近岸表层沉积物作为 磷源，用分批培养法培养海洋浮游藻类中肋骨条藻（Skeletonema Cocstatum）、聚生角毛藻（Chaetocerossocialist)、小球藻（Chloralla)、 北方娄氏藻（Lauderiaborealis)，藻类均可正常生长，说明在磷饥饿状 态下，样品中潜在生物可利用磷（PBAP）可转化并释放到水相，供藻类生长 之需。培养体系中藻类对磷的摄取与磷自样品...Chemical analysis of phosphorus forms of suspended matter and littoral surficial sediments and algal bioassay ware carried out in laboratory, and the Jiulongjiang Esturay was investigated in situ in order to study bioavailability of particulate Phosphorus in detail. Marine algae Skeletonema Costatum, Chaetoceros socialist, Chlaralla, Lauderia borealis was cultivated in batch culture with suspende...学位：理学硕士院系专业：海洋与环境学院海洋学系_海洋化学学号：1992460

Behaviours and Flux of bioavailable phosphorus in Jiulongjiang Estuary

于1995年3、5月在九龙江口进行两个航次的现场调查，研究不同形态磷的河口行为，并估算生物可利用磷的入海通量。结果表明，在S＜20区域内，溶解活性磷（drP）的行为受控于“缓冲机制”，其含量在8~10μg/dM3水平上下波动。颗粒磷中MgCl2。可提取磷（MgCl2-P）含量随盐度增大而增大，并与叶绿素A以及悬浮物中fE、Mn、Al含量呈正相关关系。nAOH/nACl可提取磷（nAOH/nACl-P）随盐度增大按指数关系下降，其含量与悬浮物中fE、Mn、Al含量呈正相关关系。HCl可提取磷（HCl-P）在河口区的行为表现为保守混合。九龙江口生物可利用磷入海通量约517T/A，其中潜在生物可利用磷（PbAP）的贡献为溶解活性磷（drP）的3倍。The surFace seawater samples of the Jiulongjiang Estuary were collected in March andMay, 1995,and the behaviours of diFFerent Forms of phosphorus and BAP Flux in the estuaryhave been estimated.The results show that the distribution of DRP is controlled by "buFFermechanism"at low salinity (S<20).The content of MgCl2-extractable phosphorus (MgCl2--P)in particulate phosphorus increases with the increase of salinity,and there are some positivecorrelation between MgCl2-P and Chlorophyll,and the contents of particulate Fe,Mn,Al re-spectively.NaOH/NaCl extractable Phosphorus (NaOH/NaCl-P)decreases exponently withthe increase of salinity.The behaviour of HCl-extractable phosphorus (HCl-P) is conserva-tive.The Flux of BAP From the Jiulongjiang Estuary is estimated to be 517 t/a,and the raticof PBAP/DRP about 2.98.国家自然科学基金!4917627

<bold>SiPM</bold>批量老练和性能测量系统研制

硅光电倍增管（Silicon Photomultiplier，SiPM）作为近年来发展的一种新型光电探测器件，具有低成本、小型化、工作电压低等优势，已广泛应用于粒子探测、医学成像、高能物理等领域，特别是在大面积粒子成像领域，有着广阔的应用前景。但大面积成像需要大量的SiPM，实现大量SiPM的批量筛选、老练和性能测量至关重要。本文研究设计了一套SiPM批量性能测量系统，可实现对512个（数量可进一步拓展）SiPM的同时老练和性能测量。通过编制在线控制程序，对大量SiPM轮询测量，实现老练和性能（包括击穿电压、温度系数）测量。结果显示：SiPM在经过老练之后，整体上暗电流显著降低，表明老练有利于使大量SiPM性能快速稳定。老练后，SiPM的击穿电压均值为24.88 V（@25 ℃），与厂商数据25 V（@25 ℃）符合良好；击穿电压随温度而增大，其温度系数为35.3 mV·℃-1。结果表明：研制的SiPM批量老练和性能测量系统能够实现对大量SiPM的同时老练，使其性能快速稳定；可快速获得大量SiPM的性能参数，获得I-V曲线、击穿电压、温度系数等，对于SiPM的批量筛选和性能测试具有显著参考价值

Gravitational wave detection by space laser interferometry

为印证广义相对论和开拓引力波天文学窗口,引力波探测是当前国际研究热点.本文围绕空间激光干涉引力波探测,对其科学意义、发展状况、关键技术等进行了回顾.与地面激光干涉引力波探测相比,空间探测的工作频段更低,从10~(-4)~10Hz,在工作距离为百万公里量级上,预计能探测到双致密星系统、超大质量比双黑洞绕转系统、中等质量比双黑洞绕转系统,以及星系合并引起的超大质量黑洞并合等波源.为此,测距精度须达到皮米的量级,并且保证测距技术有效工作的无拖曳航天技术亦有很高的要求.本文以欧洲的空间激光引力波探测计划为例,主要对上述两项技术进行分析和阐述,并展望了空间引力波探测在我国的发展趋势和前景

Measurement of integrated luminosity of data collected at 3.773 GeV by BESIII from 2021 to 2024

We present a measurement of the integrated luminosity e+e- of collision data collected by the BESIII detector at the BEPCII collider at a center-of-mass energy of Ecm = 3.773 GeV. The integrated luminosities of the datasets taken from December 2021 to June 2022, from November 2022 to June 2023, and from October 2023 to February 2024 were determined to be 4.995±0.019 fb-1, 8.157±0.031 fb-1, and 4.191±0.016 fb-1, respectively, by analyzing large angle Bhabha scattering events. The uncertainties are dominated by systematic effects, and the statistical uncertainties are negligible. Our results provide essential input for future analyses and precision measurements