Results 41 to 50 of about 22,525 (166)
Determination of Pseudostellarin B in Pseudostellaria heterophylla by HPCE and Study on Its Fingerprints Analysis [PDF]
, 2007 建立了测定太子参中环肽Pseudostellarin B含量的高效毛细管电泳(HPCE)分析方法,对10种不同产地太子参中环肽Pseudostellarin B的含量进行了测定。HPCE工作条件:采用未涂层熔融石英毛细管(内径75μm,有效长度50cm),分离电压为15kV,柱温20℃,二极管阵列检测器(DAD)检测波长为203nm,缓冲液为20mmol/L硼砂(pH=9.3)溶液。在选定的工作条件下,环肽Pseudostellarin B浓度与其响应信号值之间具有较好的线性相关性(Y=0.6357X ...
李文龙, 王小如, 陈军辉, 韩超
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The Development and Validation of the Chinese Vocabulary Levels Test
International Journal of Applied Linguistics, EarlyView.ABSTRACT In response to the increasing need for effective Chinese vocabulary assessments, this study developed the Chinese Vocabulary Levels Test (CVLT), a test designed for intermediate‐level Chinese as a second or foreign language (CSL/FL) learners, based on the vocabulary lists (levels 4–6) from the Chinese Proficiency Grading Standards for ...
Shiwei Qi, Ailan Fu
wiley +1 more source
Methodologic Study of HPCE Fingerprints of Radix paeoniae Alba and Radix paeoniae Rubra [PDF]
, 2008 目的确定赤芍和白芍的高效毛细管电泳分析方法,建立赤芍和白芍的高效毛细管电泳法(HPCE)指纹图谱。方法HPCE工作条件:采用未涂层熔融石英毛细管(内径75μm,有效长度50 cm),分离电压为25 kV,柱温25℃,二极管阵列检测器(DAD)检测波长为220 nm,缓冲液为30 mmol/L硼砂(pH=9.0)溶液。按此条件对来自不同产地的7种赤芍样品和8种白芍样品进行了分析。结果建立了赤芍和白芍HPCE指纹图谱,采用中药指纹图谱相似度计算软件 ...
杨东方 +5 more
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Shipboard transducer vibration isolation based on stiffness compensation and eddy current damping [PDF]
ObjectiveThis paper addresses problems of shipboard transducers such as large-angle tilt during multi-dimension steering and small-space compensation suppression by proposing an isolator based on stiffness compensation (SC) and eddy current damping (ECD).
Huayan PU +4 more
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Policy Studies Journal, EarlyView.ABSTRACT Despite extensive research on policy diffusion, the ways in which policy attention influences this process remain underexplored. This study addressed this gap by distinguishing between three types of policy attention—political speeches, policy issuance and field visits—and investigating their differential impacts when delivered by central and ...
Xiangning Chen, Yahua Wang
wiley +1 more source
, 2005 目的评估管状胃+幽门成形术在食管癌切除术中的应用价值。方法对52例常规经右胸食管癌切除术中行管状胃加幽门成形术,术后观察胃肠减压量及患者胸胃症状。结果术后胃肠减压量较少。全组吻合口瘘1例(为颈部吻合),胸胃-右支气管瘘并死亡1例;术后明显胸胃无力症状1例,其余病例均无明显胸胃返流及压迫症状;术后短期腹泻6例;术后发生吻合口狭窄4例。其余病例恢复良好。结论经右胸食管癌切除术中行管状胃+幽门成形术,可减轻胸胃潴留所致压迫症状及减少返流,其操作较安全 ...
付成国 +3 more
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The Inclusion Trade‐Off: Comparing the Design and Functionality of Collaborative Governance Forums
Policy Studies Journal, EarlyView.ABSTRACT Environmental challenges require collaboration across jurisdictions, often through forums or intermediary spaces for repeated interaction. A persistent forum design question concerns inclusion criteria, or which actors should be included.
Adam Wiechman +3 more
wiley +1 more source
Shuitu Baochi Xuebao, 2019 为了探究不同灌溉模式施加不同改良剂对河套灌区重度盐渍土的改良效果，设置秸秆深埋（SL）、石膏+有机肥（SF）、对照（CK）3个处理，对河套灌区重度盐渍土土壤盐分在0-70 cm剖面上的分布特点进行研究。结果表明：不同灌溉模式，SL和SF处理在0-15 cm土层均有效降低土壤pH，随改良时间延长改良深度增加pH持续降低，有一定的长效性，滴灌SL与SF处理pH较CK分别下降0.35，0.49，黄灌下降0.42，1.33，对30-70 cm土层影响较小。SF处理碱化度第2年下降达43%，SL处理为40 ...
张宇晨 +5 more
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基于复合型耦合器的新型透射式GT交错复用器及色散补偿 [PDF]
, 2010 提出了基于复合型耦合器的透射式GT腔,并将其串入马赫-曾德尔干涉仪(MZI)的两臂上,得到了一种新型的交错复用器。推导了该器件的理论表达式,并进行了数值模拟。模拟结果表明,该交错复用器具有相当好的通带平坦性,大的通带带宽、截止度和阻带带宽。对该交错复用器进行了优化分析,发现腔数固定时,纹波带宽比越大(频谱越接近矩形方波),隔离度将越小。分析结果表明,可以通过增加腔的数量来解决纹波带宽与隔离度的矛盾,即交错复用器的频谱性能随着腔数的增加得以改善。相对于环形谐振腔辅助的交错复用器 ...
张宇 +4 more
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Rare Metals, Volume 45, Issue 5, May 2026.ABSTRACT The large‐scale application of titanium is limited by its high production costs, as well as its low utilization and recycling rates. Therefore, efficient recovery of titanium scrap offers a viable pathway to reduce its cost. Molten‐salt electrolysis offers a promising route for upcycling titanium scrap, but the conventional method, which ...
Haoyu Fang +4 more
wiley +1 more source