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Study on Optimal Process and Antioxidant Activity of Polygonatum sibiricum Polysaccharides Extracted by Deep Eutectic Solvents(低共熔溶剂提取黄精多糖工艺优化及抗氧化活性研究) [PDF]

open access: yesShipin kexue jishu xuebao, 2020
In this study, Polygonatum sibiricum polysaccharides (PSPs) were extracted by deep eutectic solvents(DESs) with different ion combinations. The optimal effect of urea-choline chloride deep eutectic solvents was obtained.
WANG Tao(汪涛)   +6 more
doaj   +1 more source

月壤颗粒间的范德华力作用研究进展

open access: yesKongjian kexue xuebao, 2023
当前中国嫦娥工程“绕 、落 、回”三期任务已经圆满完成,为保持中国月球探测技术的领先地位,对月壤的力学特性进行研究具有重要意义。月表所处环境高真空、低重力和强辐射等特点使月壤表现出不同于地面砂土的性质,导致这一现象最主要的原因之一是月壤颗粒间的范德华力作用。本文对当前有关范德华力的研究进行总结,分别从分子/原子间的范德华力计算、范德华力的迟滞性、理想条件下宏观物体间的范德华力计算和真实条件下范德华力的计算四个方面对目前已有的研究进行分析,给出当前宏观颗粒间范德华力研究的不足 ...
赵 学亮   +4 more
doaj   +1 more source

重冰区特高压输电线路脱冰跳跃及塔头设计研究 [PDF]

open access: yes全球能源互联网, 2018
采用非线性导线模型,结合重冰区特高压输电线路实际情况进行计算机建模,应用有限元分析,计算档数、档距、覆冰量、脱冰比、高差、风速等因素与导线脱冰跳跃的关系。同时定性分析了导线脱冰跳跃的影响因素,对工程设计提出建议。计算结果表明,在耐张段内档数不超过5档时,脱冰跳跃高度随档数增加而增大;在档距小于1000 m时,档距越大,脱冰跳跃越严重;覆冰量越多,脱冰跳跃越严重;高差越大,垂直脱冰跳跃高度越小;风速越大,脱冰跳跃水平位移值越大。通过对计算结果的分析,对塔头设计时导(地)线层间距、水平偏移值的确定给予建议。
赵远涛, 吕健双, 李健, 孟晓波
doaj   +1 more source

30mm重冰区±1100kV特高压直流线路设计 [PDF]

open access: yes全球能源互联网, 2020
昌吉—古泉特高压工程是世界上首个±1100 kV特高压直流输电工程。线路于陕西省境内翻越秦岭高海拔重冰区,最高海拔达到2500 m,设计覆冰厚度达到30 mm,该区段线路设计方案的可靠性及合理性成为整个工程设计的难点和关键之一。结合昌吉—古泉±1100 kV特高压直流输电工程成功的设计经验,对30 mm重覆冰区段的导地线选型、绝缘子选择及配置、塔头空气间隙、防雷保护、金具及绝缘子串、杆塔型式、杆塔荷载等关键设计方案进行了论证和分析。30 ...
林锐   +4 more
doaj   +1 more source

QSPR study and three-dimensional descriptor characterization of membrane-water partition coefficient of compounds(化合物膜水分配系数的QSPR研究和分子三维参数表征)

open access: yesZhejiang Daxue xuebao. Lixue ban, 2005
利用多元线性回归和偏最小二乘分析方法,研究分子表面静电势参数,VolSurf参数与双十四酰基磷脂酰基胆碱(DMPC)-水分配系数之间的定量结构-性质关系(QSPR),均得到较好的结果.分子表面静电势参数分析表明化合物分子表面上负的静电势越分散,越倾向于分配在水相中;与水分子的作用越强,越有利于分配在水相中.此外,具有较大体积和偶极密度的分子倾向于分配在弱极性相中.VolSurf参数分析表明大体积的分子易于分配在DMPC中;分子表面亲水区域较大的分子则倾向于分配在水相中 ...
HUGui-xiang(胡桂香)   +5 more
doaj   +1 more source

基于角度敏感的空间注意力机制的轻量型旋转目标检测器

open access: yes智能科学与技术学报, 2021
随着深度学习的快速发展,近年来越来越多的基于锚框的目标检测算法被应用于遥感图像上,然而提高算法精度的代价是牺牲了检测速度。因此,选择无锚框的目标检测网络框架,针对遥感场景的特点,提出了一种旋转框的遥感检测算法。根据旋转框与其外接矩形框的空间位置关系,提出了一种简单有效的旋转框表示方式。此外,设计了一种用于辅助检测旋转目标的角度敏感的空间注意力机制,通过引入角度信息提升模型对旋转目标的检测能力。提出的算法在公开遥感数据集DOTA上进行了实验,旋转框的目标检测网络的平均精度均值达到了68.5 ...
尹开石, 杨萌, 顾曦, 王志成
doaj  

气冷微堆石墨堆芯抗震分析初探

open access: yesHe jishu
为评估气冷微堆石墨堆芯的结构安全性,获取堆芯石墨组件在地震激励下的应力状态。研究通过对比小尺寸石墨块碰撞试验与仿真模拟的加速度、速度曲线,发现仿真结果能够有效反映石墨块的碰撞规律,并可通过加速度及速度曲线识别其碰撞刚度与阻尼参数。基于试验获得的关键参数,开展了堆芯石墨构件的仿真分析,并将其应用于堆芯抗震计算中。最终完成了全堆芯模型的计算模拟,获得了石墨构件之间的相互作用力,并采用失效概率法对结构进行了评价。结果表明,石墨堆芯在地震载荷作用下满足ASME设计规范要求。
兰 天宝, 冯 天佑, 黄 忠, 盛 锋
doaj   +1 more source

海洋条件下螺旋管换热组件单相流动换热试验研究

open access: yesHe jishu
在海洋条件下流动换热组件中工质受核动力装置升潜、摇摆或复杂运动引入的附加惯性力作用并可能产生附加流动,附加流动与工质自身的流动相叠加,从而形成复杂的流动形式,进而影响换热组件的流动换热特性。为了研究海洋条件对螺旋管换热组件的流动和传热的影响,通过搭建模拟海洋条件试验平台,研究了倾斜、摇摆、起伏等典型海洋条件对螺旋管换热组件流动和传热特性的影响。研究表明:摇摆条件下,回路自然循环流量及试验段压降均随着运动呈现正弦变化,波动幅度随着摇摆角增加和周期减小而增加。由于压力波传播的速度与流量响应速度不同 ...
姚 彦贵   +5 more
doaj   +1 more source

谱熵法在核电站松动部件监测系统报警算法中的应用

open access: yesHe jishu
针对核电站松动部件监测系统因噪声导致误报警概率较高的问题,提出了一种基于信号谱熵的报警方法。该方法通过调整松动部件冲击信号能量谱不同频段的权重,对传统谱熵法进行了改进。通过对权重系数进行参数分析,确定了识别松动部件冲击振动信号的最优权重系数。借助钢球试验,研究了背景噪声、脉冲信号等干扰因素对该方法报警准确性的影响。试验结果表明,改进后的谱熵法在信噪比为-5 dB的情况下,仍能显著反映松动部件冲击信号引起的谱熵曲线波动,有效排除松动部件信号典型频段外的噪声与脉冲信号干扰 ...
骈 超   +4 more
doaj   +1 more source

计及需求响应潜力的电动汽车聚合商多主体日前投标策略 [PDF]

open access: yes全球能源互联网
针对电动汽车这一新型储能资源大规模接入后电力市场多主体竞争格局,提出一种计及需求响应潜力的电动汽车聚合商多主体日前投标策略。以实现削峰填谷、保障电网安全稳定运行等为目标,促使电网与聚合商等多方市场主体可持续发展,探索其未来商业模式。首先,根据电动汽车用户出行特性进行电动汽车集群分类,考虑出行时间、到达时间及荷电状态等因素,模拟集群内用户随机充放电选择。结合聚合商整体充电功率上限值与电能波动区间值等主要因素,基于历史数据评估聚合商需求响应潜力。然后,考虑多个聚合商投标问题,建立日前市场投标模型 ...
侯慧   +6 more
doaj   +1 more source

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Deprecated: Function utf8_encode() is deprecated in /var/www/openaccess.click/meta_xml.php on line 47

Deprecated: Function utf8_encode() is deprecated in /var/www/openaccess.click/meta_xml.php on line 47

Deprecated: Function utf8_encode() is deprecated in /var/www/openaccess.click/meta_xml.php on line 47

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Deprecated: Function utf8_encode() is deprecated in /var/www/openaccess.click/meta_xml.php on line 47

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Deprecated: Function utf8_encode() is deprecated in /var/www/openaccess.click/meta_xml.php on line 47

Deprecated: Function utf8_encode() is deprecated in /var/www/openaccess.click/meta_xml.php on line 47

Deprecated: Function utf8_encode() is deprecated in /var/www/openaccess.click/meta_xml.php on line 47

Deprecated: Function utf8_encode() is deprecated in /var/www/openaccess.click/meta_xml.php on line 47

Deprecated: Function utf8_encode() is deprecated in /var/www/openaccess.click/meta_xml.php on line 47

Deprecated: Function utf8_encode() is deprecated in /var/www/openaccess.click/meta_xml.php on line 47

Deprecated: Function utf8_encode() is deprecated in /var/www/openaccess.click/meta_xml.php on line 47

Deprecated: Function utf8_encode() is deprecated in /var/www/openaccess.click/meta_xml.php on line 47

Deprecated: Function utf8_encode() is deprecated in /var/www/openaccess.click/meta_xml.php on line 47

Deprecated: Function utf8_encode() is deprecated in /var/www/openaccess.click/meta_xml.php on line 47

Deprecated: Function utf8_encode() is deprecated in /var/www/openaccess.click/meta_xml.php on line 47

Deprecated: Function utf8_encode() is deprecated in /var/www/openaccess.click/meta_xml.php on line 47

Deprecated: Function utf8_encode() is deprecated in /var/www/openaccess.click/meta_xml.php on line 47

Deprecated: Function utf8_encode() is deprecated in /var/www/openaccess.click/meta_xml.php on line 47

Deprecated: Function utf8_encode() is deprecated in /var/www/openaccess.click/meta_xml.php on line 47

Deprecated: Function utf8_encode() is deprecated in /var/www/openaccess.click/meta_xml.php on line 47

Deprecated: Function utf8_encode() is deprecated in /var/www/openaccess.click/meta_xml.php on line 47

Deprecated: Function utf8_encode() is deprecated in /var/www/openaccess.click/meta_xml.php on line 47

Deprecated: Function utf8_encode() is deprecated in /var/www/openaccess.click/meta_xml.php on line 47

Deprecated: Function utf8_encode() is deprecated in /var/www/openaccess.click/meta_xml.php on line 47

Deprecated: Function utf8_encode() is deprecated in /var/www/openaccess.click/meta_xml.php on line 47

Deprecated: Function utf8_encode() is deprecated in /var/www/openaccess.click/meta_xml.php on line 47

Deprecated: Function utf8_encode() is deprecated in /var/www/openaccess.click/meta_xml.php on line 47

Deprecated: Function utf8_encode() is deprecated in /var/www/openaccess.click/meta_xml.php on line 47

Deprecated: Function utf8_encode() is deprecated in /var/www/openaccess.click/meta_xml.php on line 47

Deprecated: Function utf8_encode() is deprecated in /var/www/openaccess.click/meta_xml.php on line 47

Deprecated: Function utf8_encode() is deprecated in /var/www/openaccess.click/meta_xml.php on line 47

Deprecated: Function utf8_encode() is deprecated in /var/www/openaccess.click/meta_xml.php on line 47

Deprecated: Function utf8_encode() is deprecated in /var/www/openaccess.click/meta_xml.php on line 47

Deprecated: Function utf8_encode() is deprecated in /var/www/openaccess.click/meta_xml.php on line 47

Deprecated: Function utf8_encode() is deprecated in /var/www/openaccess.click/meta_xml.php on line 47

Deprecated: Function utf8_encode() is deprecated in /var/www/openaccess.click/meta_xml.php on line 47

Deprecated: Function utf8_encode() is deprecated in /var/www/openaccess.click/meta_xml.php on line 47

Deprecated: Function utf8_encode() is deprecated in /var/www/openaccess.click/meta_xml.php on line 47

Deprecated: Function utf8_encode() is deprecated in /var/www/openaccess.click/meta_xml.php on line 47

Deprecated: Function utf8_encode() is deprecated in /var/www/openaccess.click/meta_xml.php on line 47

Deprecated: Function utf8_encode() is deprecated in /var/www/openaccess.click/meta_xml.php on line 47

Deprecated: Function utf8_encode() is deprecated in /var/www/openaccess.click/meta_xml.php on line 47

Deprecated: Function utf8_encode() is deprecated in /var/www/openaccess.click/meta_xml.php on line 47

Deprecated: Function utf8_encode() is deprecated in /var/www/openaccess.click/meta_xml.php on line 47

Deprecated: Function utf8_encode() is deprecated in /var/www/openaccess.click/meta_xml.php on line 47

Deprecated: Function utf8_encode() is deprecated in /var/www/openaccess.click/meta_xml.php on line 47

Deprecated: Function utf8_encode() is deprecated in /var/www/openaccess.click/meta_xml.php on line 47

Deprecated: Function utf8_encode() is deprecated in /var/www/openaccess.click/meta_xml.php on line 47

Deprecated: Function utf8_encode() is deprecated in /var/www/openaccess.click/meta_xml.php on line 47

Deprecated: Function utf8_encode() is deprecated in /var/www/openaccess.click/meta_xml.php on line 47

Deprecated: Function utf8_encode() is deprecated in /var/www/openaccess.click/meta_xml.php on line 47

Deprecated: Function utf8_encode() is deprecated in /var/www/openaccess.click/meta_xml.php on line 47

Deprecated: Function utf8_encode() is deprecated in /var/www/openaccess.click/meta_xml.php on line 47

Deprecated: Function utf8_encode() is deprecated in /var/www/openaccess.click/meta_xml.php on line 47

Deprecated: Function utf8_encode() is deprecated in /var/www/openaccess.click/meta_xml.php on line 47

Deprecated: Function utf8_encode() is deprecated in /var/www/openaccess.click/meta_xml.php on line 47

Deprecated: Function utf8_encode() is deprecated in /var/www/openaccess.click/meta_xml.php on line 47

Deprecated: Function utf8_encode() is deprecated in /var/www/openaccess.click/meta_xml.php on line 47

Deprecated: Function utf8_encode() is deprecated in /var/www/openaccess.click/meta_xml.php on line 47

Deprecated: Function utf8_encode() is deprecated in /var/www/openaccess.click/meta_xml.php on line 47

Deprecated: Function utf8_encode() is deprecated in /var/www/openaccess.click/meta_xml.php on line 47

Deprecated: Function utf8_encode() is deprecated in /var/www/openaccess.click/meta_xml.php on line 47

Deprecated: Function utf8_encode() is deprecated in /var/www/openaccess.click/meta_xml.php on line 47

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Deprecated: Function utf8_encode() is deprecated in /var/www/openaccess.click/meta_xml.php on line 47

Deprecated: Function utf8_encode() is deprecated in /var/www/openaccess.click/meta_xml.php on line 47

Deprecated: Function utf8_encode() is deprecated in /var/www/openaccess.click/meta_xml.php on line 47

Deprecated: Function utf8_encode() is deprecated in /var/www/openaccess.click/meta_xml.php on line 47

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Deprecated: Function utf8_encode() is deprecated in /var/www/openaccess.click/meta_xml.php on line 47