基于蓝牙定位的老年人室内跌倒监护系统设计     

赵帅豪  王坚 《北京测绘》2020,(3):333-337

随着全球老龄化的加剧,老年人口的增多,老年人的健康监护已经成为了重要的社会问题。因身体机能的下降,老年人发生跌倒的概率非常高,而老年人一天中大约90%的时间是处于室内,针对老年人室内意外跌倒的医护救治,设计了一款基于蓝牙定位的老年人室内跌倒监护系统。该系统通过集成的传感器采集加速度、角速度、室内位置、人体生理信息等数据,并通过计算分析实现了跌倒监测报警功能。  相似文献   

华南寒武纪早期刺胞动物演化框架     

韩健  郭俊锋  欧强  宋祖晨  刘平  郝文静  孙洁  王星 《地学前缘》2020,27(6):67-78

刺胞动物是华南寒武纪早期海洋生态系统的重要组成部分,针对这类化石的研究有助于深入了解寒武纪多幕式爆发事件。本文主要根据寒武纪早期扬子板块陕南宽川铺生物群、湖北岩家河生物群以及澄江生物群产出的刺胞动物,探讨刺胞动物在寒武纪早期的演化框架,取得了以下初步认识。截至目前,所发现的寒武纪早期刺胞动物绝大多数都属于水母超纲,珊瑚纲的化石记录在寒武系幸运阶、第二阶保存较为罕见。其中寒武系幸运阶刺胞动物的化石记录全部属于底栖类型,体型小,且具有多种类型的身体辐射对称形式,绝大多数类型可以确定属于直接发育。第二阶刺胞动物仍以底栖固着类型为主,体形增大,仅见两、四辐射对称形式;而寒武系第三阶刺胞动物仍有底栖固着类型,但游泳的水母开始出现,体型增大明显,代表水母冠群的出现,以及世代交替的复杂生命周期的正式建立。从幸运阶到第三阶刺胞动物体型明显增大,可能与海水氧气含量增加有关。在寒武纪大爆发的背景下,刺胞动物的分异度和丰度在寒武系幸运阶就已经达到顶峰,然后在第二阶、第三阶开始衰减,这种变化可能与两侧对称动物辐射演化有关。华南刺胞动物的化石记录表明,寒武纪大爆发并非纯粹的一幕式爆发,其中充斥着一系列生物群的替代甚至灭绝事件。  相似文献   

东海北部小型底栖动物群落对径流及黑潮暖流入侵的响应   总被引：1，自引：1，他引：0  

刘清河  马林  李新正 《海洋学报》2020,42(2):52-64

为探究小型底栖动物群落在东海北部及其临近海域的分布规律，及其对环境因子的响应，于2016年9月和12月，对研究海域共计20个站位的小型底栖动物和环境因子进行了取样调查。调查结果显示，研究海域内共鉴定出小型底栖动物类群16个，其中海洋线虫为绝对优势类群，其他优势类群主要包括桡足类、动吻类和多毛类。9月航次小型底栖动物平均丰度为(1 758±759)个/（10 cm2），线虫占95.6%；平均生物量为(1 216.4±464.7) μg/(10 cm2)(干重)，线虫占55.26%。12月航次平均丰度为(2 011±1 471)个/(10 cm2)，线虫占95.6%；平均生物量为(1 143.0±755.0)μg/(10 cm2)(干重)，线虫占67.28%。聚类分析结果显示，小型底栖动物群落主要可以划分为近岸和外海两个组，其中近岸组小型底栖动物丰度显著高于外海站位。但在各断面分布上，绝大多数站位小型底栖动物丰度最高值均出现在60 m等深线附近，并且该水深处站位的温度和盐度数值均表现出黑潮水的特征。黑潮近岸分支对东海陆架入侵是导致小型底栖动物分布差异的重要原因，小型底栖动物在60 m等深线附近具有的高丰度值可作为其对黑潮入侵的响应。推测，黑潮入侵所导致的水体初级生产力增加以及黑潮水所携带的溶氧可能是导致该深度处小型底栖动物丰度增加的主要原因。  相似文献   

不同氮磷比值下浒苔与石莼的竞争作用研究     

杨雪  林锟  谭丽菊  王江涛 《海洋学报》2020,42(8):50-58

近年来，海水富营养化导致近海海域大型海藻过量繁殖，成为世界性的环境问题。自2007年以来，浒苔绿潮在黄海海域连续暴发，造成巨大经济损失。为探究浒苔大规模暴发与氮磷比值(N/P)的关系，及其与其他大型绿藻在不同N/P下的竞争机制，研究了浒苔(Ulva prolifera)与石莼(Ulva lactuca)在不同N/P下单独培养和共培养时的生长情况，探究了浒苔及石莼生长的变化；结合苏北浅滩海域现场N/P的调查结果，分析了浒苔绿潮暴发的可能机制。研究结果表明:(1)浒苔单独培养时，在一定范围内高N/P能促进浒苔的生长，氮对于浒苔的影响大于磷。(2)石莼单独培养时，低N/P下石莼长势最好，但改变N/P对石莼的影响并不显著。(3)浒苔和石莼共培养时，浒苔生长受到了一定限制，低N/P下浒苔生长受限更显著。(4)苏北浅滩海域高N/P更适合浒苔的生长，可能是浒苔绿潮能够大规模暴发的原因之一。  相似文献   

渤海海域浮游病毒和浮游细菌的丰度变化与环境因子之间的耦联关系     

王彩霞  吴霖  王毅波  Paterson James S.  Mitchell James G.  胡晓珂 《海洋学报(英文版)》2020,39(6):72-83

Uncovering the role of environmental factors and finding critical factors which harbor significant fractions in governing microbial communities remain key questions in coastal marine systems. To detect the interactions between environmental factors and distributions of virio-and bacterioplankton in trophic coastal areas, we used flow cytometry to investigate the abundance of virio-and bacterioplankton covering 31 stations in the Bohai Sea of China. Our results suggested that the average abundance of total virus(TV) in winter(～2.29×10~8 particles/mL)was slightly lower than in summer(～3.83×10~8 particles/mL). The mean total bacterial abundance(TB) was much lower in winter(～2.54×107 particles/mL) than in summer(～5.43×10~7 particles/mL). Correlation analysis via redundancy analysis(RDA) and network analysis among virioplankton, bacterioplankton and environmental factors revealed that the abundances of viral and bacterial subpopulations depend on environmental factors. In winter, only temperature significantly influenced the abundances of virio-and bacterioplankton. In summer, in addition to temperature, both salinity and nutrient(SiO_2) had a remarkable impact on the distribution of virioand bacterioplankton. Our results showed a clear seasonal and trophic pattern throughout the whole water system, which revealed that temperature and eutrophication may play crucial roles in microbial distribution pattern.  相似文献   

2017年春夏季西北太平洋浮游植物的区域差异及其与不同水团的关系   总被引：2，自引：0，他引：2  

林更铭  陈杨航  黄奖  王彦国  叶又茵  杨清良 《海洋学报(英文版)》2020,39(6):107-118

The West Pacific Ocean is considered as the provenance center of global marine life and has the highest species diversity of numerous marine taxa. The phytoplankton, as the primary producer at the base of the food chain,effects on climate change, fish resources as well as the entire ecosystem. However, there are few large-scale surveys covering several currents with different hydrographic characteristics. This study aimed to explore the relationships between the spatio-temporal variation in phytoplankton community structure and different water masses. A total of 630 water samples and 90 net samples of phytoplankton were collected at 45 stations in the Northwest Pacific Ocean(21.0°–42.0°N, 118.0°–156.0°E) during spring and summer 2017. A total of 281 phytoplankton taxa(5 μm) belonging to 61 genera were identified in the study area. The distribution pattern of the phytoplankton community differed significantly both spatially and temporally. The average abundances of phytoplankton in spring and summer were 797.07×10~2 cells/L and 84.94×10~2 cells/L, respectively. Whether in spring or summer, the maximum abundance always appeared in the northern transition region affected by the Oyashio Current, where nutrients were abundant and diatoms dominated the phytoplankton community;whereas the phytoplankton abundance was very low in the oligotrophic Kuroshio region, and the proportion of dinoflagellates in total abundance increased significantly. The horizontal distribution of phytoplankton abundance increased from low to high latitudes, which was consistent with the trend of nutrient distributions, but contrary to that of water temperature and salinity. In the northern area affected by the Oyashio Current, the phytoplankton abundance was mainly concentrated in the upper 30 m of water column, while the maximum abundance often occurred at depths of 50–75 m in the south-central area affected by the Kuroshio Current.Pearson correlation and redundancy analysis(RDA) showed that phytoplankton abundance was significant negatively correlated with temperature and salinity, but positively correlated with nutrient concentration. The phytoplankton community structure was mainly determined by nutrient availability, especially the N:P ratio.  相似文献   

A new pelagic Polyconchoecia Xiang,Chen and Du, 2018(Ostracoda:Myodocopa:Halocyprididae) from the South China Sea     

项鹏  王雨  陈瑞祥  叶又茵  王春光  陈小银  林茂 《海洋学报(英文版)》2020,39(4):73-83

Halocyprid ostracods are appreciable part of ostracods floating through virtually everywhere in marine environment.In this study,we describe a new species of genus Polyconchoecia Xiang,Chen and Du,2018,tribe Conchoeciini Chavtur and Angel,2011,family Halocyprididae Dana,1853 from the middle of the South China Sea.Polyconchoecia chenii sp.nov.is very close to P.commixtus Xiang,Chen and Du,2018.But it differs from P.commixtus by the distinctions of locations of major glands of carapace and the characteristics of appendages:more posteriorly situated left asymmetric gland of carapace,no right asymmetric gland;segmented frontal organ;the endopod 2 of the first antenna with a very small seta;a-and c-setae of the first antenna with long end joint have long end joint,the b-and d-setae have no end joint,spinose e-seta without end joint;the e-seta of the second antenna is present;teeth side is distinctive;the setal counts of the mandible,maxilla,fifth limb,and sixth limb are individual.The locations of the major glands on carapace and the characteristics of the first antenna can be the key of the new species.This work is the second discovery of the genus Polyconchoecia from the world.  相似文献   

东南印度洋中脊澳大利亚-南极洲不整合带地区岩浆供应与构造作用沿洋脊的变化     

刘守金  林间  周志远  张帆 《海洋学报(英文版)》2020,39(1):118-129

We analyzed seafloor morphology and geophysical anomalies of the Southeast Indian Ridge(SEIR) to reveal the remarkable changes in magma supply along this intermediate fast-spreading ridge. We found systematic differences of the Australian-Antarctic Discordance(AAD) from adjacent ridge segments with the residual mantle Bouguer gravity anomaly(RMBA) being more positive, seafloor being deeper, morphology being more chaotic, M factors being smaller at the AAD. These systematic anomalies, as well as the observed Na_(8.0) being greater and Fe_(8.0) being smaller at AAD, suggest relatively starved magma supply and relatively thin crust within the AAD.Comparing to the adjacent ridges segments, the calculated average map-view M factors are relatively small for the AAD, where several Oceanic Core Complexes(OCCs) develop. Close to 30 OCCs were found to be distributed asymmetrically along the SEIR with 60% of OCCs at the northern flank. The OCCs are concentrated mainly in Segments B3 and B4 within the AAD at ～124°–126°E, as well as at the eastern end of Zone C at ～115°E. The relatively small map-view M factors within the AAD indicate stronger tectonism than the adjacent SEIR segments.The interaction between the westward migrating Pacific mantle and the relatively cold mantle beneath the AAD may have caused a reduction in magma supply, leading to the development of abundant OCCs.  相似文献   

中国海洋无脊椎动物分类学与系统演化研究进展与展望     

李新正  寇琦  王金宝  甘志彬  杨梅  龚琳  隋吉星  马林  曲寒雪  初雁凌  曾宥维  王伟娜  张祺  董栋 《海洋科学》2020,44(7):26-70

综述了我国海域无脊椎动物的分类学和系统演化研究的历史和概况，以及我国分类系统学工作者在海洋无脊椎动物分类学、区系与动物地理学、系统发育与分子系统学领域的主要工作，重点介绍了中国科学院海洋研究所的海洋无脊椎动物分类学工作。涉及类群包括原生动物、海绵动物、刺胞动物、线虫、多毛类环节动物、星虫、螠虫、软体动物、节肢动物、苔藓动物、毛颚动物、棘皮动物、半索动物等主要的无脊椎动物门类。涉及海域以我国管辖海域，特别是中国近海为主，也涉及了西太平洋、西南印度洋等深海环境的无脊椎动物类群的分类学报道。本文总结过去，展望未来，对于在我国在海洋无脊椎动物分类与系统演化研究领域成就基础上，发现薄弱环节，研讨今后本学科的发展方向，填补研究空白，赶超本领域国际前沿，都有重要借鉴意义。  相似文献   

起伏海面的雷电电磁场传播特征及其对闪电定位精度的影响     

张源源  庞华基  刘钊  宋琳  邓猛 《海洋科学》2020,44(5):34-41

为了研究起伏海面对雷电电磁传播的影响,本文利用Barrick表面阻抗理论和Wait近似算法,采用改进二维分形海面模型模拟起伏海面,利用数值模式,分析起伏海面的雷电电磁传播特征,并进一步讨论了起伏海面对时差法闪电定位系统定位精度的影响。结果表明:起伏海面对垂直电场和磁场的峰值的影响不显著,但会引起波形的上升期时间的延长,浪高越大,影响越明显;随着观测距离的增加,雷电垂直电场波形的上升时间逐渐变长;风速的变化与雷电垂直电场波形的上升时间成正比;由于海面起伏引起雷电电磁场波形在传播中的变化会影响基于时差法闪电定位系统的定位精度,定位误差可达几至十几公里。  相似文献