会员体验
专利管家(专利管理)
工作空间(专利管理)
风险监控(情报监控)
数据分析(专利分析)
侵权分析(诉讼无效)
联系我们
交流群
官方交流:
QQ群: 891211   
微信请扫码    >>>
现在联系顾问~
热词
    • 8. 发明授权
    • Method of radio-frequency excitation in an NMR experiment
    • NMR实验中射频激发的方法
    • US4940940A
    • 1990-07-10
    • US309798
    • 1989-01-10
    • Patrick Leroux
    • Patrick Leroux
    • A61B5/055G01N24/08G01R33/46G01R33/54
    • G01R33/54
    • In order to optimize the determination of radio-frequency energization in an NMR experiment, the Schrodinger equation is written relative to the amplitude of probability of the wave function of spins resonating at a given resonance frequency wherein the Hamiltonian depends on the frequency and on the radio-frequency energization to which they are subjected. Analytical polynominal expressions are deduced for the probability amplitudes at the end of the energization as a function of the resonance frequency. The coefficients are optimized by means of calculation algorithms, from which the characteristics of the energization are deduced.
    • PCT No.PCT / FR87 / 00260 Sec。 371日期:1989年1月10日 102(e)日期1989年1月10日PCT提交1987年7月2日。为了优化NMR实验中射频通电的测定,薛定er方程相对于波函数的概率的幅度 自旋在给定的谐振频率下谐振,其中哈密顿量取决于频率和它们所经受的射频通电。 分析多项式表达式作为谐振频率的函数推导出通电结束时的概率幅度。 通过计算算法优化系数,推导出通电特性。
    • 9. 发明授权
    • Method for fast imaging by nuclear magnetic resonance
    • 通过核磁共振快速成像的方法
    • US4914391A
    • 1990-04-03
    • US286985
    • 1988-11-21
    • Patrick Leroux
    • Patrick Leroux
    • A61B5/055G01R33/48G01R33/50G01R33/561
    • G01R33/5613
    • Fast imaging in spin-spin relaxation time known as T.sub.2 is proposed. It is shown that, instead of awaiting total restoration of longitudinal magnetization of the magnetic moments of excited particles of a body subjected to the experiment, the excitation-measurement sequences of the experiment can be made to follow each other at a higher rate on condition that the angle of tilt of said magnetization is limited to a value which is distinctly lower than 90.degree., at which a good signal-to-noise ratio in response is still obtained. It is shown that, with a loss of signal-to-noise ratio of only 3 dB, there is obtained a rate of image production which is four times higher.
    • PCT No.PCT / FR88 / 00136 Sec。 371日期:1988年11月21日 102(e)1988年11月21日日期PCT提交1988年3月15日PCT公布。 出版物WO88 / 07672 日期:1988年10月6日。提出了称为T2的自旋自旋弛豫时间的快速成像。 显示出,不是等待经受实验的体的激发粒子的磁矩的纵向磁化的全面恢复,实验的激发测量序列可以以更高的速率相互追随,条件是 所述磁化的倾斜角度被限制在明显低于90°的值,在此值仍然获得良好的响应信号噪声比。 结果表明,信噪比只有3dB的损失,得到的图像产生速率是四倍。
    • 10. 发明授权
    • Process for the preparation of pyridine and substituted pyridines
    • 制备吡啶和取代吡啶的方法
    • US4401819A
    • 1983-08-30
    • US360567
    • 1982-03-22
    • Georges CordierPatrick Leroux
    • Georges CordierPatrick Leroux
    • C07D211/12C07D213/06C07D213/08C07D213/09C07D213/133
    • C07D213/06C07D213/08C07D213/133
    • The present invention relates to a process for the preparation of pyridine and substituted pyridines, in the vapor phase. These compounds are obtained by heating, at a temperature of 200.degree. to 500.degree. C., in the vapor phase:piperidine or piperidine substituted by one or more lower alkyl radicals;1,5-diaminopentane;1,5-diaminopentane containing, in its hydrocarbon part, from 1 to 3 linear or branched alkyl radicals having from 1 to 4 carbon atoms; orcompounds such as: N,N'-bis-(piperidin-2-yl)hydrazines,in the presence of a catalyst consisting of palladium, platinum or ruthenium deposited on a macroporous solid.The products obtained by the process according to the invention have various uses. Pyridine is used in particular as a solvent. .beta.-Picoline (or 3-methylpyridine) is used for the preparation of nicotinic acid or nicotinamide, used in pharmacy and in nutrition.
    • 本发明涉及一种在气相中制备吡啶和取代吡啶的方法。 这些化合物通过在气相中在200〜500℃的温度下加热得到:哌啶或被一个或多个低级烷基取代的哌啶; 1,5-二氨基戊烷; 在其烃部分含有1至3个具有1至4个碳原子的直链或支链烷基的1,5-二氨基戊烷; 或诸如:N,N'-双(哌啶-2-基)肼的化合物在沉积在大孔固体上的由钯,铂或钌组成的催化剂存在下进行。 通过本发明方法获得的产品具有各种用途。 特别是作为溶剂使用吡啶。 β-哌啶(或3-甲基吡啶)用于制备用于制药和营养的烟酸或烟酰胺。