IMSFT法中化学和物理发泡剂的选择问题

研究了IMSFT法中选择化学及物理发泡剂的一般要求,探讨了几类较为可行的化学发泡剂的发泡机理以及部门物理发泡剂的性能,并进行了比较。     

EAST���Ӳ�ϵͳ���ݴ���ģʽ������

提出一种基于双缓冲的中断式数据采集、文件分割式存储以及文件合并式数据显示方法,解决了EAST低杂波系统数据量大幅增加后数据采集、储存和显示的问题。此方法在首次EAST低杂波放电中的应用令人满意。     

Pyrohyperforin, A New Prenylated Phloroglucinol from Hypericum perforatum

The antidepressant activity of Hypericum perforatum extracts has sparked great interestin the chemistry and biochemistry of its constitUents, generating coverage also on themainstream press'. The major limitation to a rational exploitation of the medicinalpotential of this plant is our still incomplete knowledge of its active constitUents. In the1970s, Rusian workers described the isolation and characterization of one activeconstitUent named hyperforin (l) from Hypericum perforatum'". Then …     

CHINA GRAVITY BASIC NET 1985

The China Gravity Basic Net 1985 (CGBN85) which comprises 57 gravity stations, including 6 absolute gravity stations, was measured with LaCoste & Romberg gravimeter model G (LCR-G). Precise relative connections were also made between CGBN85 and several existing international standards. A whole adjustment was made by applying the parameter adjustment method, taking scale functions for each LCR-G meter into account. The nationwide new CGBN85 with an average internal accuracy ±8μGal [10~(-8)ms~(-2)] was then established and has been used, since its official appraisal, in gravimetric practices for two years. This shows that CGBN85 meets the requirements of modern earth sciences.     

2-β-二酮-1,3,2-二苯并[d.f]和二萘并(α,β)[d.f]-二氧硼杂环庚二烯的合成与结构

四配位硼化合物化学是硼化学的重要组成部分,许多化学工作者对此进行过大量研究。然而,有关螺型四配位硼化合物的报道却很少。先前,作者曾合成出以硼为螺原子的螺环[4.5]和螺环[5.5]化合物;本文则报道,     

HL—1装置铁芯变压器气隙研究

本文对HL-1装置铁芯变压器气隙进行了实验研究和理论计算。模拟实验给出了不同气隙情况下,空载和负载放电时,等离子体区的杂散场和铁芯磁化曲线测试结果。并用HL-1装置的理论计算值及力线分布做了验证。     

TopSpin核磁共振软件中集成的DOSY采集／处理模块DOSYmTM

Bruker TopSpinTM核磁共振软件中集成的DOSY数据采集和处理模块DOSYm^TM,可以方便简单地进行DOSY实验的在线数据采集与处理,并已很好地应用于复杂混合物的定性和定量分析,如天然混合物、石油产品、医药产品、食品工业及质量控制等领域．本文介绍了DOSY实验的原理,数据采集和处理的方法及DOSYm^TM模块的应用．     

A Novel Borophosphate Coordination Polymer with Sandwich-type Supramolecular Architecture

A novel borophosphate (Hmel)3{Co2[(mel)2(HPO4)2(PO4)]·H3BO3·H2O} (mel= melamine) has been synthesized under mild solvothermal conditions. The structure of the compound exists a high ordered organic-inorganic sandwich-type supramolecular architecture via metal-coordination, hydrogen bonds and π-π stacking interactions.     

Synthesis of Hymecromone Derivatives Containing Chiral 1,1''''-Bi-2-naphthyl Moiety for Dual-mode Molecular Switch

Some hymecromone derivatives containing chiral 1,1'-bi-2-naphthyl moiety were synthesized and their photodimerizations were investigated. It was found that fluorescence intensity and optical rotation of the new chiral hymecromone derivatives could be regulated by light. This property has potential significance for developing a new type of dual-mode molecular switch.     

Multi-segment linear gradient optimization strategy based on resolution map in HPLC

1 Introduction As a powerful tool of separating and analyzing complex samples, high performance liquid chroma- tography (HPLC) is widely applied. The key point of establishing stable and complete method of analysis is the selection of separation conditions. Accompanying the development of computer technology, it is possible to investigate the separation performance of each component in the sample under a wide range of ex- perimental conditions based on the information ob- tained by carrying …