臭椿中新苦木苦素的结构鉴定

采用现代色谱和波谱技术 ,对采自甘肃省甘谷县的臭椿 (Ailanthusaltissima)根皮进行化学成分研究。从其乙醇提取物中分离得到 2个化合物 ,确定了它们的化学结构。二者均为未见报道的新臭椿苦内酯 ,命名为1α ,11α_epoxy_2 β ,11β ,12 β ,2 0_tetrahydroxypicrasa_3,13_ (2 1)_dien_16_one和 1α ,11α_epoxy_2 β ,11β ,12α ,2 0_tetrahydroxypicrasa_3,13_ (2 1)_dien_16_one。并对其抗癌活性进行了初步测试。     

中医药治疗消化性溃疡的临床研究进展

综述近年来国内医学杂志关于中医治疗消化性溃疡的研究报导，勾勒了国内在这一领域医学临床的发展概貌及趋向。     

A high-current electron beam ion trap as an on-line charge breeder for the high precision mass measurement TITAN experiment

The precision of atomic mass measurements in a Penning trap is directly proportional to the charge state q of the ion and, hence, can be increased by using highly charged ions (HCI). For this reason, charge breeding with an electron beam ion trap (EBIT) is employed at TRIUMF’s Ion Trap for Atomic and Nuclear science (TITAN) on-line facility in Vancouver, Canada. By bombarding the injected and trapped singly charged ions with an intense beam of electrons, the charge state of the ions is rapidly increased inside the EBIT. To be compatible with the on-line requirements of short-lived isotopes, very high electron beam current densities are needed. The TITAN EBIT includes a 6 Tesla superconducting magnet and is designed to have electron beam currents and energies of up to 5 A and 60 keV, respectively. Once operational at full capacity, most species can be bred into a He-like configuration within tens of ms. Subsequently, the HCI are extracted, pass a Wien filter to reduce isobaric contamination, are cooled, and injected into a precision Penning trap for mass measurement. We will present the first results and current status of the TITAN EBIT, which has recently been moved to TRIUMF after assembly and commissioning at the Max-Planck-Institute (MPI) for Nuclear Physics in Heidelberg, Germany.     

中医妇科课程案例教学法的应用

研究如何改进教学方法,是每一个任课教师的责任,本文阐述了案例教学在中医妇科学教学中的作用及如何将案例教学融入特殊教育等问题。     

水下沉桩施工新技术

肇庆换流站供水工程之一的五尺峡取水泵站施工中，在受施工条件限制的情况下，采用将钢筋混凝土预制桩改为开口钢管桩，将双排桩改为单排桩，尝试搭设水上竹平台作沉桩施工平台等措施均取得成功，保证了质量、安全、进度，降低了施工成本．     

谈在药品监督执法中要体现服务

文章阐述了在药品监督执法的同时，如何体现服务。     

一个快速的二进制多重精度gcd算法

求两个整数的最大公因子（gcd)的经典的Euclid算法时间复杂度为O（ln^3n)，不适宜于多重精度运算。论文证明了gcd的相关性质，提出了一个基于二进制的、适用于多重精度运算的改进算法，其时间复杂度为O（ln^2n)。     

反馈网络的反馈系数与负载效应的函数性

给出了四种负反馈电路反馈系数F的精确计算公式和近似计算公式。证明了电压负反馈电路的反馈系数和反馈网络的负载效应,都是负载RL的函数。     

激光在医学中的应用

激光在医学领域的应用非常广泛，本文主要介绍了激光诊断和激光治疗的几个重要应用。     

浅析GPS高程测量在水利工程中的应用

简要介绍了GPS高程测量的原理,结合其在水利工程中的应用实例,对GPS高程测量技术进行了探讨。