Long-term and real-time monitoring system of the East/Japan sea     

Kuh Kim  Yun Bae Kim  Jong Jin Park  SungHyun Nam  Kyung-Ae Park  Kyung-Il Chang 《Ocean Science Journal》2005,40(1):25-44

Long-term, continuous, and real-time ocean monitoring has been undertaken in order to evaluate various oceanographic phenomena and processes in the East/Japan Sea. Recent technical advances combined with our concerted efforts have allowed us to establish a real-time monitoring system and to accumulate considerable knowledge on what has been taking place in water properties, current systems, and circulation in the East Sea. We have obtained information on volume transport across the Korea Strait through cable voltage measurements and continuous temperature and salinity profile data from ARGO floats placed throughout entire East Sea since 1997. These ARGO float data have been utilized to estimate deep current, inertial kinetic energy, and changes in water mass, especially in the northern East Sea. We have also developed the East Sea Real-time Ocean Buoy (ESROB) in coastal regions and made continual improvements till it has evolved into the most up-to-date and effective monitoring system as a result of remarkable technical progress in data communication systems. Atmospheric and oceanic measurements by ESROB have contributed to the recognition of coastal wind variability, current fluctuations, and internal waves near and off the eastern coast of Korea. Long-term current meter moorings have been in operation since 1996 between Ulleungdo and Dokdo to monitor the interbasin deep water exchanges between the Japanese and Ulleung Basins. In addition, remotely sensed satellite data could facilitate the investigation of atmospheric and oceanic surface conditions such as sea surface temperature (SST), sea surface height, near-surface winds, oceanic color, surface roughness, and so on. These satellite data revealed surface frontal structures with a fairly good spatial resolution, seasonal cycle of SST, atmospheric wind forcing, geostrophic current anomalies, and biogeochemical processes associated with physical forcing and processes. Since the East Sea has been recognized as a natural laboratory for global oceanic changes and a clue to abrupt climate change, we aim at constructing a 4-D continuous real-time monitoring system, over a decade at least, using the most advanced techniques to understand a variety of oceanic processes in the East Sea.  相似文献   

Estimation of Lightning-Generated NO_x in the Mainland of China Based on Cloud-to-Ground Lightning Location Data     

Qi LI  Fengxia GUO  Xiaoyu JU  Ze LIU  Mingjun GAN  Kun ZHANG  Binbin CAI 《大气科学进展》2023,40(1):129-143

Lightning-generated nitrogen oxides(LNO_x) have a major influence on the atmosphere and global climate change.Therefore, it is of great importance to obtain a more accurate estimation of LNO_x. The aim of this study is to provide a reference for the accurate estimation of the total LNO_x in the mainland of China based on cloud-to-ground lightning(CG)location data from 2014 to 2018. The energy of each CG flash was based on the number of return strokes per CG flash, t...  相似文献   

纤维状二氧化硅纳米球的扫描电镜形貌观察     

戴玉洁  丁秀萍  王亚斌  戈桦 《盐湖研究》2018,26(3):59-63

利用场发射扫描电子显微镜(FESEM)研究了纤维状二氧化硅纳米球(KCC-1)的形貌,探讨了样品前处理方法、加速电压、工作距离、发射电流、减速模式对其FESEM图像的影响规律。结果表明,影响FESEM成像的因素较多,其中样品前处理方法、工作距离和加速电压是影响图片质量的主要因素;选择乙醇为溶剂、硅片为基底、较小的工作距离、较低的加速电压、高发射电流、减速观察模式的优化观测条件可获得理想的FESEM图像。  相似文献   

两次高压电线积冰过程气象成因分析   总被引：3，自引：0，他引：3  

刘雪静  牛生杰 《气象科学》2016,36(2):230-235

对2008年2月25—26日和2009年1月5—9日湖北省500 kV高压输电线路张恩1回线307号杆塔采集到的两次积冰过程进行分析,结果表明:两次积冰过程具有相似的环流形势即500 hPa中高纬为两槽一脊。低纬度地区有短波槽活动,700 hPa低空急流明显,地面处于冷锋前。低空急流、地面冷锋均有利于冰冻雨雪天气发生,且积冰过程中均有良好的温湿条件,并都伴有降水发生,这些条件都为积冰形成提供了良好的动力及热力条件。而2008年积冰过程大气温度垂直结构存在暖层,是造成两次过程形成机制不同的原因之一。  相似文献   

等电势梯度下电极间距对电渗影响的试验研究     

李瑛  龚晓南 《岩土力学》2012,33(1):89-95

通过室内1:5的模型试验进行了等电势梯度下2 m×1 m和1 m×0.5 m两种工程常见矩形布置电极间距下的软黏土电渗性状的研究。利用监测排水量、排水速率、电流、电势、含水率和pH值等指标,对不同电极间距试样的电渗处理效果、能量效率和电极腐蚀等方面进行了分析。结果表明：保持电势梯度不变而减半电极间距能够加快电渗排水,降低土体含水率,减小能量消耗和电极界面电阻,但也会导致土体pH值变化和阳极腐蚀量的增大。此外,采用较小的电极间距可使损失在电极和土接触面上的电势降减小,但损失的电势降占电源电压的比例增大。  相似文献   

A set-up converter and energy transfer system of an “Energy-2” generator for electromagnetic sounding and monitoring of zones of earthquake sources     

E. D. Tereshchenko  V. F. Grigoryev  M. B. Barannik  A. N. Danilin  B. V. Efimov  V. V. Kolobov  P. I. Prokopchuk  V. N. Selivanov  Yu. A. Kopytenko  A. A. Zhamaletdinov 《Seismic Instruments》2009,45(1):119-133

A boost converter and a system of energy transfer at a high voltage (up to 1100 V) developed for an “Energy-2” generator 200 kW in power are described. This generator is intended for solving the problems of precision monitoring of the electromagnetic depth of the Earth’s crust at seismoactive regions with an aim to search for earthquake forerunners. High voltage allows taking off the total generator’s power on transmitting antennas with high resistance (7 Ω and higher) within a wide frequency range (0.1–200 Hz) as well as on low-resistance antennas (lower than 0.7 Ω) at high frequencies (greater than 20 Hz). Modern Russian and foreign literature on the problem of developing transformers and rectifiers of the generator’s power circuit, responsible for generation of powerful low-frequency electromagnetic signals, is reviewed. Theoretical research and numerical simulation of the “Energy-2” generator’s power circuit are performed and the element base of the latter is optimized. Based on the developed documentation of all components, radiators and a system of forced ventilation have been made. The proposed generator-measuring complex has no analogs in world practice and can be used for solving a wide range of fundamental and applied problems. Original Russian Text ? E.D. Tereshchenko, V.F. Grigoryev, M.B. Barannik, A.N. Danilin, B.V. Efimov, V.V. Kolobov, P.I. Prokopchuk, V.N. Selivanov, Yu.A. Kopytenko, A.A. Zhamaletdinov, 2009, published in Seismicheskie Pribory, 2009, No. 4, pp. 43–65.  相似文献   

特高压气体绝缘开关设备瓷套管抗震性能研究   总被引：2，自引：0，他引：2       下载免费PDF全文

王海菠  程永锋  孙宇晗  王宁华  卢智成  乔振宇 《地震工程学报》2018,40(3):406-412

为评估某型号1 100kV特高压(UHV)气体绝缘开关设备(GIS)瓷套管的抗震性能,将其连同支撑筒体与支架一起安装在振动台上,开展特高压气体绝缘开关设备瓷套管振动台试验。试验采用符合特高压标准反应谱的人工波激励该瓷套管,得到瓷套管关键部位的加速度、位移和应变响应。运用数值仿真软件ABAQUS对该振动台试验进行数值仿真研究,分析试验模型的自振频率、套管根部应力和套管顶端相对位移,得到与试验结果吻合较好的结果,证明该数值仿真模型的有效性。通过数值仿真的手段研究套管固有频率和本体(支撑筒体和支架)刚度的变化对套管抗震性能的影响,结果表明:该套管固有频率在一定范围内变化时,其地震响应相对较小;随着本体刚度的增大,套管根部最大应力与套管顶端最大相对位移均呈下降的趋势,因此适当增大本体的刚度可以降低套管的地震响应。  相似文献   

智利高地震烈度区高压瓷瓶隔离开关的高等级抗震考核试验     

王军丽  吉堂付  翁萱  杨辉  朱云龙 《震灾防御技术》2019,14(2):314-327

为获取户外高压隔离开关的动态特性、研究瓷瓶破断力与地震载荷的关系以及验证隔离开关的抗震性能,开展了相关的考核试验。依据IEEE 693—2005标准的要求,试验前进行了应变计的校准试验、瓷瓶的弯曲破断试验和隔离开关的抗震性能试验。经过抗震试验,隔离开关完好无损且在抗震试验前后其共振频率变化不大,瓷瓶破断力大于地震载荷的2倍。结果表明隔离开关结构稳定,通过了抗震考核。  相似文献   

探讨超低剂量前瞻性冠脉CTA成像技术在低体重指数患者中的应用价值     

田执南  龙世亮  赵越  谭宏文 《CT理论与应用研究》2017,26(1):99-106

目的:探讨在低体重指数患者中使用80kVp管电压的前瞻性心脏冠脉CTA成像的可行性。方法:对84例临床上怀疑冠心病的患者应用80kVp管电压的前瞻性心脏冠脉CTA检查。按BMI分为80kVp（BMI≤22kg/m2）和100kVp（2265次/分）。分析直径≥1.5mm的冠脉节段的图像质量（1～4分）,比较各组的图像质量及辐射剂量。结果:两组患者的年龄、身高、心率的一致性较好（P>0.05）。80kVp、100kVp组的ED分别为(0.56±0.21)mSv、(1.43±0.58)mSv。两组的CT容积剂量指数（CT dose index volume,CTDIvol）、剂量长度乘积（dose length product,DLP）、ED存在显著的统计学差异（（P=0.000）。80kVp、100kVp组的合格图像分别为92.2％、91.8％。两组的图像质量评分、主动脉SNR及左、右冠主干CNR无统计学差异(P>0.05)。结论:80kVp的超低剂量前瞻性冠脉CTA可以应用于低体重指数患者,图像质量足以满足诊断需要,辐射剂量显著降低。   相似文献   

微机控制大功率脉冲电源     

史重光 《中国海洋大学学报(自然科学版)》1999,(4)

介绍一种新型电化学用大功率脉冲电源的硬件原理及软件算法,它的特殊优势在于其多闭环反馈控制可实现（大惰性负载情况下）垂直方波,实现恒流制的任意值限压（包括负载突然断路瞬间输出电压限制到０）以及实现恒压制的任意值限流（包括负载突然短路时瞬间实现恒流）。近期已成功应用在铝合金阳极氧化和镀铜等工业技术领域。  相似文献