1) crossed dipoles
交叉偶极子对
2) cross dipole acoustic
交叉偶极子声波
3) cross dipole
交叉偶极
1.
By the tool,slowness of compressional wave,shear wave and Stoneley wave can be accurately acquired by means of full wave signals of monopole,cross dipole and quadrupole mode,and then anisotropy of stratum can be analyzed.
一种新型多极子阵列声波测井仪器由上电子短节、声系和下电子短节等3个相对独立的部分组成,能够通过单极、交叉偶极和四极声波全波信号准确获得纵波、横波和斯通利波时差,并分析地层的各向异性特征,求取孔隙度、估算渗透率、识别岩性等。
2.
A high speed high accuracy and multi-channel synchronous data acquisition system for array acoustic logging is designed, which can be used under downhole high temperature, the requirements for cross dipole simulation signal process for acoustic logging, the integration of acquisition circuit and method for its data processing are put forward.
设计了一种可工作于井下高温环境,用于阵列声波测井的高速高精度多通道同步数据采集系统,提出了声波测井对交叉偶极模拟信号的处理要求以及采集电路的构成和采集数据处理的方法。
4) Cross Multipole Array Acoustic(XMAC)
XMAC交叉偶极子声波测井
6) asymmetric cross-coupling
不对称交叉偶联
1.
A new and feasible method for synthesizing optically active(R)-(-)-and (S)-(+)-α-cur-cumene (1) via 6-methyl-5-heptene-2-magnesium bromide (5) asymmetric cross-coupling reac-tion with p-bromotoluene(4a) catalyized by chiral phosphine-transition metal complexes, in opticalyield up to 50%e.
本文报道了在手性膦过渡金属配合物催化下,以对溴甲苯(4a)与6-甲基-5-庚烯-2-溴化镁(5)经不对称交叉偶联反应合成(R)-(-)-和(S)-(+)-a-姜黄烯(1)的方法,光学收率分别为44％e。
补充资料：“质子-电子偶极-偶极”质子弛豫增强
“质子-电子偶极-偶极”质子弛豫增强
物理学术语。原子核外层中不成对的电子质量小，但磁动性很强，可使局部磁场波动增强，促使氢质子弛豫加快，从而使T1和T2缩短，这种效应即为PEDDPRE。过渡元素和镧系元素大部分在d和f轨道有多个不成对电子，所以其离子往往具有PEDDPRE，可用来作顺磁性对比剂，如钆(Gd)。Gd在外层有7个不成对电子，具有很强的顺磁性。
说明：补充资料仅用于学习参考，请勿用于其它任何用途。
参考词条