四元

A new technology for making chromium trioxide and potassium nitrate simultaneously by using nitric acid to decompose potassium dichromate has been analyzed according to phase diagrams of the K2Cr2O7-CrO3-KNO3-HNO3-H2O quaternary system at 0oC, 25oC and 45oC based on experimental results.

以实验测得的K2Cr2O7-CrO3-KNO3-HNO3-H2O四元体系相图为依据，对用硝酸酸化重铬酸钾联产铬酸酐和硝酸钾工艺过程进行分析，确定了铬和钾利用率最大时的操作条件。

Adopt project practical quaternion algorithm of strapdown navigation system, Analyze systematic error source, emulation prove the output change of SINS in there is device error of inertia and the initial condition of collimation error.

采用了工程上实用的四元数捷联导航系统的算法，分析了系统误差源，仿真验证了捷联惯导系统在有惯性器件误差及初始对准误差情况下的输出变化。

Based on the estimation of the directions of arrival and the Doppler frequencies of the sources, a quaternion model was proposed, which made the estimation of the DOA and the Doppler frequencies similar to that of one-dimensional azimuths so as to avoid direct and indirect pairing with the complex model.

针对阵列信号处理中方向角、多普勒频率的同时估计问题，提出了方向角、多普勒频率的四元数模型，使估计方向角、多普勒频率二维问题与估计一维问题相类似，从而避免了在经典的二维复数模型估计中直接或间接的配对。

As our experiments were concerned, the after growth of InGaP, GaAs was grown at a lower temperature than that for InGaP. This made the P atoms on the InGaP surface hard to desorb and greatly reduce the thickness of InGaAsP intermixing layer.

在我们的实验中，成长完磷化铟镓后，以较低的温度成长砷化镓，这将使磷化铟镓表面的磷原子较不易脱附，因此可显著的减少磷砷化铟镓四元混合层的厚度。

The rear end is characterize by the GT-R's hallmark four-ring taillights, rear spoiler and large, integrated exhaust tips.

后方到底是由定性的gt - r的标志，四元环尾灯，后扰流板和大型，综合性排气小费。

They are 2,3-epoxynopyl acetate,1-hydroxy-2,3-epoxynopyl acetate and 5-hydroxy-2,3-epoxynopyl acetate.The results suggested that the four-ring of nopyl acetate cleaved firstly in th...

分析结果表明反应主要是四元环开裂，并进一步水合，另外伴有少量双键环氧化的产物，这些环氧化的产物还可进一步在C1和C5处发生叔氢氧化。

By utilizing three benezenemulticarboxylate derivatives (H2chdc, H2aip, NaH2sip), we obtain 12 coordination polymers. Especially, compelexes 1 and 2 are based on one-dimensional ···OHInOHIn···chains as building units, while complex 3 is based on double four-ring [In8(μ2-O)4(μ2-H2O)8]16+, complex 4 is based on trinuclear In3(μ3-O)(CO2)6, complexes 11 and 12 are both based on nested bistranded helices.

选择了三类取代苯羧酸配体： 2，5-二羟基-1，4-对苯二甲酸(2，5-H2chdc)； 5-氨基间苯二甲酸(5-H2aip)； 5-磺酸基间苯二甲酸钠盐(5-NaH2sip)和InCl3反应合成了十二个配位化合物：其中1、2以···OHInOHIn···链为构筑单元， 3以双四元环[In8(μ2-O)4(μ2-H2O)8]16+为构筑单元，4以棱柱状三核铟In3(μ3-O)(CO2)6为构筑单元，而11、12以嵌套的双股螺旋链为构筑单元。

Multinitroazetidines have been a kind of important new high density energetic materials because of the high strain energy associated with their four-membered ring and can be used constituents of high energy explosive, propellant and gun power.

多硝基氮杂环丁烷因其紧凑张力的四元杂环结构使该类化合物具有很高的能量，从而成为一类重要的高能量密度材料，可作为高能炸药、推进剂和炮用发射药的组成成分。

The two competitive reactions both consist of two steps, two reactants firstly form a three-membered ring intermediate (INT1) and a twisted four-membered ring intermediate (INT2), respectively, both of which are barrier-free exothermic reactions of 41.5 kJ/mol and 72.3 kJ/mol; then INT1 isomerizes to a four-membered ring product (P1) via transition state (TS1), and INT2 results in the chlorine-transfer product (P2) via transition state (TS2), with the barriers of 2.9 kJ/mol and 0.3 kJ/mol, respectively.

INT1和INT2分别经过渡态TS1和TS2异构化为了四元环产物P1和生成了氯迁移产物P2，其势垒分别为2.9和0.3 kJ/mol。

Type KFMJ-D pneumatic hydraulic multi-functional cardboard laminator is another brand new model developed firstly successfully by our Company on the basis of type A and B, C it is an integration of pneumatic, hydraulic, photoelectric and mechanical technology.

KFMJ-D 型气动液压式多功能卡纸覆面机，是我公司在A型、 B型、 C型的基础上率先开发研制成功，更新换代推出又一代崭新的机型，该机集气动、液压、光电、机械四元为一体。

Singer Leona Lewis and former Led Zeppelin guitarist Jimmy Page emerged as the bus transformed into a grass-covered carnival float, and the pair combined for a rendition of "Whole Lotta Love".

歌手leona刘易斯和前率领的飞艇的吉他手吉米页出现巴士转化为基层所涵盖的嘉年华花车，和一双合并为一移交&整个lotta爱&。

This is Kate, and that's Erin.

这是凯特，那个是爱朗。