Results 21 to 30 of about 6,853 (177)

胶浸纸浸油式套管的色谱异常原因分析

open access: yesDianci bileiqi, 2021
目前通过溶解气体分析(DGA)诊断油浸纸套管内部缺陷已经比较成熟。对于胶浸纸浸油式套管,浸泡胶浸纸材料的绝缘油分解产物与油浸纸绝缘系统缺陷产生的油分解产物有所差异,能否直接采用油纸绝缘系统的DGA分析法判断内部缺陷的类型和程度有待研究。笔者以一起220 kV胶浸纸浸油式套管油色谱异常案例为例,分析了胶浸纸浸油系统中绝缘油色谱的特点及油色谱异常的原因,可作为该类型套管故障诊断的参考判断依据。
张晋寅   +4 more
doaj  

International clinical practice recommendations on the definition, diagnosis, assessment, intervention, and psychosocial aspects of developmental coordination disorder – Chinese (Mandarin) translation

open access: yesDevelopmental Medicine &Child Neurology, Volume 61, Issue 3, Page E1-E35, March 2019., 2019
目的 本国际临床指南由欧洲残疾儿童学会(the European Academy of Childhood Disability,EACD)牵头制定,旨在解决发育性协调障碍(developmental coordination disorder,DCD)的定义、诊断、评估、干预以及与社会心理方面的临床应用关键问题。 方法 本指南针对五个领域的关键问题,通过文献综述和专家团队的正式讨论达成共识。为保证指南的循证基础,以“机制”、“评估”和“干预”为检索词, 对2012年更新以来提出的最新建议以及新增的“社会心理问题”和“青少年/成人”为检索词进行检索。根据牛津大学循证医学中心证据等级 (证据水平 [level of evidence, LOE]1–4) 将结果进行分类,最终转化为指南建议。并由国际 ...
Jing Hua   +6 more
wiley   +1 more source

不同品种、盐度及月份菊芋叶中绿原酸的含量测定 [PDF]

open access: yes, 2015
建立HPLC 法测定菊芋叶中绿原酸含量的方法,对菊芋植株中不同部位绿原酸的分布规律,以及不同品系、盐度、采摘时间等因素对菊芋叶中绿原酸含量的影响情况进行研究。方法:色谱柱为Hypersil BDS C-18(4.6×250 mm,5 μm),流速为1 mL min-1 ,检测波长为327 nm,进样量为10 μL,柱温为30℃,流动相为0.1%三氟乙酸水(A)-乙腈(B)。结果:菊芋叶中绿原酸的含量(3.40%)显著高于其他部位绿原酸的含量;10 ...
夏传海   +1 more
core  

Dual‐Rare‐Earth‐Doped Piezoelectric Semiconductor Gallate Solids With Spectral Tuning for Energy Conversion and Photonic Applications

open access: yesRare Metals, Volume 45, Issue 1, January 2026.
ABSTRACT Mechanoluminescent materials have gained significant attention for their unique capability to convert mechanical stimuli into light without external optical or electrical excitation, holding immense promise for applications in safety monitoring, biomedicine, optical anti‐counterfeiting, and intelligent sensing.
Fanlei Qin   +8 more
wiley   +1 more source

A literature review of analytical techniques for materials characterisation of painted textiles - Part 2: spectroscopic and chromatographic analytical instrumentation [PDF]

open access: yes, 2017
Part Two of this Literature Review of analytical techniques for materials characterisation of painted textiles focusses on the application of vibrational and x-ray spectroscopic and chromatographic techniques used in the analysis of painted textiles to ...
Lennard, Frances   +2 more
core   +1 more source

Thermodynamics‐Driven Phase‐Field Kinetics Simulation for Experiment‐Validated Design of CoNi‐Based Superalloys

open access: yesRare Metals, Volume 45, Issue 1, January 2026.
ABSTRACT Thermodynamic prediction‐driven phase‐field kinetic simulation, with experimental verification, is utilized to explore the high‐performance cobalt–nickel based (CoNi‐based) superalloys. The roles of aluminum (Al) in microstructural evolution and precipitation kinetics of ordered L12‐γ′ strengthened Co–Ni–xAl superalloys are revealed. The alloy
Kun‐Ning Niu   +6 more
wiley   +1 more source

Qualitative analysis of polymethylsiloxane terminated with hydrogen(氢封端聚二甲基硅氧烷的定性分析)

open access: yesZhejiang Daxue xuebao. Lixue ban, 2013
使用气相色谱质谱联用(GC-MS)和电喷雾四极杆飞行时间质谱(ESI-Q-TOF)对氢封端聚二甲基硅氧烷进行分析,通过谱图解析,确定了样品中有100个相对分子质量134~3 908的组分,分别属于4种同系物,包括2种链状聚二甲基硅氧烷和2种环状聚二甲基硅氧烷.
CUILing-zhi(崔灵芝)   +2 more
doaj   +1 more source

Study on aroma components of osmanthus by absorption wire gas chromatography / mass spectrometry(吸附丝色谱-质谱法用于桂花香气研究)

open access: yesZhejiang Daxue xuebao. Lixue ban, 2001
用活性炭吸附丝累积采集桂花活花的香气成分,通过热解脱附直接导入色谱/质谱仪进行定性定量分析,鉴定出β-芳樟醇、氧化芳樟醇、β-顺-罗勒烯等41种化合物.本方法可用于鲜花香气成分的活体分析.
FENGJan-yue(冯建跃)   +3 more
doaj   +1 more source

Distributions of Nitrous Oxide and its Influence Factors in the Bering Sea, Western Arctic Ocean and Nordic Sea [PDF]

open access: yes, 2015
氧化亚氮(Nitrousoxide,N2O)是大气中重要的温室气体,也是破坏臭氧层的化学物质之一,海洋是大气中N2O重要源。随着气候变暖效应的增强,海洋系统发生一系列变化,如:海表温度上升、海冰减少、海平面上升以及海洋酸化等现象。北冰洋是地球系统的重要组成部分,对气候变化的响应和反馈具有放大作用,在北极海域开展N2O温室气体的研究,可揭示北冰洋在全球N2O循环过程中扮演的重要角色。本研究于中国第五次北极科学考察期间,利用静态顶空分析方法,首次对白令海、西北冰洋及北欧海N2O的分布特征及影响因素进行研究 ...
张介霞
core  

Asymmetric Transfer Hydrogenation of Ketones Catalyzed by Chiral Multidentate Aminophosphine Ligands/Iron Cluster [PDF]

open access: yes, 2017
从廉价易得、绿色环保的铁簇合物Fe_3(CO)_(12)出发,开展了其与手性多齿胺膦配体(R,R,R,R)-PN_4H_6原位生成的催化体系在酮; 的不对称转移氢化中的应用研究.通过考察温度、添加剂等影响因素,探索最优的反应条件,并将其进一步应用于多种芳香酮的不对称转移氢化反应,得到高达96; % ee的对映选择性.As one of the most abundant metals on earth, iron is cheap and low toxicity. Herein we reported
吴访   +4 more
core   +1 more source

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