Objective Up to 45% of total organic carbon(TOC) was probably lost during acid treatment in carbonate-rich rocks(Froelich, 1980). Some scientists thought these acidsoluble organic matters were largely contributed from...Objective Up to 45% of total organic carbon(TOC) was probably lost during acid treatment in carbonate-rich rocks(Froelich, 1980). Some scientists thought these acidsoluble organic matters were largely contributed from carboxylic acid salts, which were commonly developed in alkaline carbonate formations and could potentially be excellent sources for natural gas stored in Early Paleozoic carbonate rocks in the Ordos Basin(Chong and McKay, 1984;Liu et al., 2017).展开更多
THEY used to call me Private Enterprise Li(Li Minying),but I would rather be known as"Three F Li"(Li Sannong).It was by accident that I became an economist.At the very beginning of China's economic refor...THEY used to call me Private Enterprise Li(Li Minying),but I would rather be known as"Three F Li"(Li Sannong).It was by accident that I became an economist.At the very beginning of China's economic reform,I presented the concept of transforming China's economy through shareholding,and suggested that the private sector and the state-owned sector enjoy equal status in the economy.展开更多
液压设备在运行过程中伴随着多域间的能量转换,尤其在变工况下呈现出非平稳性及非线性等特征,为状态监测与故障诊断带来难度。为了提高非平稳工况轴向柱塞泵故障诊断的性能,该研究提出采用既是运行参数又是状态参量的瞬时转速信号作为...液压设备在运行过程中伴随着多域间的能量转换,尤其在变工况下呈现出非平稳性及非线性等特征,为状态监测与故障诊断带来难度。为了提高非平稳工况轴向柱塞泵故障诊断的性能,该研究提出采用既是运行参数又是状态参量的瞬时转速信号作为轴向柱塞泵故障诊断的信息源。通过理论分析得出瞬时转速信号的波动成分中蕴含着元件健康状态信息。提出采用同步提取标准S变换(synchro-extracting of normal S transform,SNST)对其进行线通滤波处理。利用K-medoids方法将滤波重构后的瞬时转速波动信号角度域特征值进行聚类分析,并在机电液一体化平台上进行了变转速和变负载工况试验,实现了轴向柱塞泵配流盘在正常、轻微、严重磨损时的故障诊断。研究成果可为液压设备的运行状态监测与故障诊断提供新的方法。展开更多
基金founded by Natural Science Basic Research Program of Shaanxi(Grant No.2020JQ-590)the National Science Foundation of China(Grant No.41673066,41930426)China Postdoctoral Science Foundation(Grant No.2019M653713)。
文摘Objective Up to 45% of total organic carbon(TOC) was probably lost during acid treatment in carbonate-rich rocks(Froelich, 1980). Some scientists thought these acidsoluble organic matters were largely contributed from carboxylic acid salts, which were commonly developed in alkaline carbonate formations and could potentially be excellent sources for natural gas stored in Early Paleozoic carbonate rocks in the Ordos Basin(Chong and McKay, 1984;Liu et al., 2017).
文摘THEY used to call me Private Enterprise Li(Li Minying),but I would rather be known as"Three F Li"(Li Sannong).It was by accident that I became an economist.At the very beginning of China's economic reform,I presented the concept of transforming China's economy through shareholding,and suggested that the private sector and the state-owned sector enjoy equal status in the economy.
文摘液压设备在运行过程中伴随着多域间的能量转换,尤其在变工况下呈现出非平稳性及非线性等特征,为状态监测与故障诊断带来难度。为了提高非平稳工况轴向柱塞泵故障诊断的性能,该研究提出采用既是运行参数又是状态参量的瞬时转速信号作为轴向柱塞泵故障诊断的信息源。通过理论分析得出瞬时转速信号的波动成分中蕴含着元件健康状态信息。提出采用同步提取标准S变换(synchro-extracting of normal S transform,SNST)对其进行线通滤波处理。利用K-medoids方法将滤波重构后的瞬时转速波动信号角度域特征值进行聚类分析,并在机电液一体化平台上进行了变转速和变负载工况试验,实现了轴向柱塞泵配流盘在正常、轻微、严重磨损时的故障诊断。研究成果可为液压设备的运行状态监测与故障诊断提供新的方法。
基金supported by the Discovery Grant from National Science&Engineering Council of Canada(RGPIN/355304-2010)the grants from Natural Science Foundation of China(30770971&81070362)
文摘骨形态发生蛋白(bone morphogenetic proteins,BMPs)是属于TGF-β超家族成员的一组重要细胞因子,参与细胞分化、增殖和胚胎发育等生理过程。不同的BMPs在脊椎动物中具有不同的功能。在信号通路上,BMPs的功能主要由Smad家族蛋白介导,后者包括8个成员,其中Smad1,Smad5和Smad8介导BMPs的信号转导,而Smad2和Smad3介导TGF-β的信号转导。虽然一些BMPs如BMP4和BMP9存在于肝脏,但肝脏中是否存在BMP13尚未有报道。BMP13,又名生长分化因子-6(growth differentiation factor 6,GDF6)或软骨来源的形态生成蛋白-2(cartilage-derivedmorphogenetic protein 2,CDMP2)。研究表明:BMP13参与骨和肌腱的修复,可刺激腱样细胞的增殖。笔者最新的研究结果揭示肝脏组织中有BMP13的表达并在肝脏代谢异常时具有差异表达。本文主要介绍BMP13生物功能研究的最新进展,尤其是BMP13在肝脏中的作用。
