In this paper, a set of ultrasonic vibration device connecting with small angle light scattering(SALS) for in-situ observing phase-transition of polymer under ultrasonic vibration was established. The experiments for ...In this paper, a set of ultrasonic vibration device connecting with small angle light scattering(SALS) for in-situ observing phase-transition of polymer under ultrasonic vibration was established. The experiments for verifying polypropylene(PP) indicated that ultrasonic vibration resulted in the decrease of the crystallization rate and made PP crystallizable at low temperature.展开更多
SALS(Single Anchor Leg Storage)系统是单点系泊系统形式之一。以油轮为基础的SALS系统具有适用水深大、投资小、可重复利用、本身具有储油能力、安装方便且无须特殊设备协助等特点。随着海上石油开发向深水、恶劣海况推进,SALS系统的...SALS(Single Anchor Leg Storage)系统是单点系泊系统形式之一。以油轮为基础的SALS系统具有适用水深大、投资小、可重复利用、本身具有储油能力、安装方便且无须特殊设备协助等特点。随着海上石油开发向深水、恶劣海况推进,SALS系统的应用日趋增多。我国南海珠江口盆地的海况恶劣,台风频繁,水深多在100 m以上。因而,进行SALS系统在南海油田开发中的可行性研究有着重要的意义。 SALS系统的基本构成如图1所示,是由单浮筒系泊发展过来的单锚腿存储系统。展开更多
Sally and her friend Beth are walking in the community center.They started taking a craft class there a few weeks ago."Wasn't that a fun class,Sally?"asks Beth."It was!I want to get some supplies to...Sally and her friend Beth are walking in the community center.They started taking a craft class there a few weeks ago."Wasn't that a fun class,Sally?"asks Beth."It was!I want to get some supplies today.I need a few things for class on Friday,Sally says.展开更多
基于WRF(Weather Research and Forecasting)模式,选取河南“21·7”特大暴雨事件,采用局地增长模培育法(Local Breeding Growth Mode,LBGM)生成对流尺度集合预报系统,在此基础上对24 h累积降水量进行SAL(Structure,Amplitude and L...基于WRF(Weather Research and Forecasting)模式,选取河南“21·7”特大暴雨事件,采用局地增长模培育法(Local Breeding Growth Mode,LBGM)生成对流尺度集合预报系统,在此基础上对24 h累积降水量进行SAL(Structure,Amplitude and Location)检验,结合预报成功指数(Threat Score,TS)、公平成功指数(Equitable Threat Score,ETS)评分等评分结果进行对比分析,综合评估集合预报成员的预报效果,表明:1)基于局地增长模培育法生成初始扰动的集合预报系统成员对于强降水预报有一定优势,在降水强度和位置的预报上与实况较接近;2)经检验,成员e003的TS和ETS评分在20日00时—21日00时(北京时,下同)和21日08时—22日08时两个强降水时段内表现最佳,并在SAL检验中对应较好的降雨强度A和雨区位置L,而成员e008暴雨TS、ETS评分最低,对应SAL检验中具有一定的位置偏差,即TS、ETS评分和SAL检验之间存在相关性,将二者有机结合,可以为业务工作中定量评估模式降水预报效果提供参考;3)通过对比整体评分表现较好的成员e003和较差的成员e008,两者预报的位势高度场与ERA5(ECMWF reanalysis v5,ERA5)再分析资料之间的差值,可以验证降水预报误差主要源于对低涡系统的预报偏差,同时预报评分较好的成员其位势高度偏差较小,综合评估效果更佳。展开更多
This study is designed to determine whether the outermost layer of articular cartilage is deficient in Osteoarthritis (OA). Phospholipids present in healthy and osteoarthritis (OA) synovial fluid show significant diff...This study is designed to determine whether the outermost layer of articular cartilage is deficient in Osteoarthritis (OA). Phospholipids present in healthy and osteoarthritis (OA) synovial fluid show significant differences in their concentration. While examining the surface properties of OA joints, we found that OA PLs molecules cannot support lubrication, and increased friction was observed. Our lubrication mechanism was based on a surface active phospholipids (SAPL) multibilayer which in OA condition was deactivated and removed from the cartilage surface under OA conditions. Cartilage wettability study clearly demonstrated a significant decrease in hydrophobicity, the contact angle, θ (theta), dropping from 103° from bovine healthy cartilage to 65° in surface partially depleted and 35.1° for completely depleted surface. These results are discussed in the context that surface active phospholipid (SAPL) and lubricin, each has specific roles in a lamellar-repulsive lubrication system. However, deactivated phospholipid molecules are major indicator of cartilage wear (model) introduced in this study.展开更多
文摘In this paper, a set of ultrasonic vibration device connecting with small angle light scattering(SALS) for in-situ observing phase-transition of polymer under ultrasonic vibration was established. The experiments for verifying polypropylene(PP) indicated that ultrasonic vibration resulted in the decrease of the crystallization rate and made PP crystallizable at low temperature.
文摘利用T-mode斜交旋转主成分分析法,对湖南2021年汛期(4—9月)逐小时850 hPa风场进行环流分型,在此基础上开展同期华南快速循环同化模式(CMA-GD-R3)小时降水预报性能检验。结果表明:影响湖南2021年汛期的主要环流型为西南涡切变型、切变型、副热带高压边缘南风型和台风外围东风型4类;模式小时降水预报的晴雨准确率和分级降水TS评分日变化特征明显,晴雨准确率夜间高于白天,分级降水TS评分峰值出现在早晨,各环流型的临近时效降水预报效果较好,短时强降水发生频次最高的西南涡切变型晴雨准确率较低,副热带高压边缘南风型在较大量级降水表现相对较差;SAL(structure amplitude and location)检验显示,西南涡切变型、切变型过程模式位置预报较接近实况,强度预报表现为前弱后强,副热带高压边缘南风型过程预报落区分散,位置预报不稳定,整体强度较实况明显偏弱,台风外围东风型过程在短时预报时效落区接近实况,强度预报显著偏弱,该方法能较客观地反映模式降水预报空间偏差。
文摘Sally and her friend Beth are walking in the community center.They started taking a craft class there a few weeks ago."Wasn't that a fun class,Sally?"asks Beth."It was!I want to get some supplies today.I need a few things for class on Friday,Sally says.
文摘基于WRF(Weather Research and Forecasting)模式,选取河南“21·7”特大暴雨事件,采用局地增长模培育法(Local Breeding Growth Mode,LBGM)生成对流尺度集合预报系统,在此基础上对24 h累积降水量进行SAL(Structure,Amplitude and Location)检验,结合预报成功指数(Threat Score,TS)、公平成功指数(Equitable Threat Score,ETS)评分等评分结果进行对比分析,综合评估集合预报成员的预报效果,表明:1)基于局地增长模培育法生成初始扰动的集合预报系统成员对于强降水预报有一定优势,在降水强度和位置的预报上与实况较接近;2)经检验,成员e003的TS和ETS评分在20日00时—21日00时(北京时,下同)和21日08时—22日08时两个强降水时段内表现最佳,并在SAL检验中对应较好的降雨强度A和雨区位置L,而成员e008暴雨TS、ETS评分最低,对应SAL检验中具有一定的位置偏差,即TS、ETS评分和SAL检验之间存在相关性,将二者有机结合,可以为业务工作中定量评估模式降水预报效果提供参考;3)通过对比整体评分表现较好的成员e003和较差的成员e008,两者预报的位势高度场与ERA5(ECMWF reanalysis v5,ERA5)再分析资料之间的差值,可以验证降水预报误差主要源于对低涡系统的预报偏差,同时预报评分较好的成员其位势高度偏差较小,综合评估效果更佳。
文摘This study is designed to determine whether the outermost layer of articular cartilage is deficient in Osteoarthritis (OA). Phospholipids present in healthy and osteoarthritis (OA) synovial fluid show significant differences in their concentration. While examining the surface properties of OA joints, we found that OA PLs molecules cannot support lubrication, and increased friction was observed. Our lubrication mechanism was based on a surface active phospholipids (SAPL) multibilayer which in OA condition was deactivated and removed from the cartilage surface under OA conditions. Cartilage wettability study clearly demonstrated a significant decrease in hydrophobicity, the contact angle, θ (theta), dropping from 103° from bovine healthy cartilage to 65° in surface partially depleted and 35.1° for completely depleted surface. These results are discussed in the context that surface active phospholipid (SAPL) and lubricin, each has specific roles in a lamellar-repulsive lubrication system. However, deactivated phospholipid molecules are major indicator of cartilage wear (model) introduced in this study.
