ICP—AES法测定U3O8标样中Al、Cr、Fe、Mg、P、Pb、Ti、V、W

用7402季铵－Kel-F粉萃取色层使铀和待测杂质元素分离，接着用975型ICP光量计测定U3O8标样中Al、Cr、Fe、Mg、P、Pb、Ti、V、W，回收率为95－110％，相对标准偏差≤5％。     

稀土元素ICP—AES法摄谱数据的简便处理

本文用PC－1500微机以三次多项式拟合的方法处理稀土元素ICP－AES法摄谱数据，讨论了实验方面的有关问题，提出了一套较为简便的实验方法。通过人工合成样分析及磷矿基体中的加料回收实验，证明本法符合实用要求。     

JY70P等离子体光量计通讯功能的开发

最近我们从法国引进了一台等离子体光量计。本文介绍了在该仪器上开发通讯功能的一种方法，在仪器内部手稿接口板，接上数据传输线，编制通讯软件并使其纳入到原系统软件模块中去，从而完成了异型机之间的PASCAL操作系统下的通讯功能的开发任务。     

等离子体发射光谱法同时测定铬铁矿中铬、铁、镁和铝

铬铁矿属难熔矿种之一，经典分析方法在铂金坩埚内过氧化钠半熔，容量法测定铬、铁离子交换分离富集后，再用容量法或比色法测定其它元素，分离手续繁杂，耗费试剂多，周期长。等离子光谱（ICP）技术具有稳定性好、灵敏度高、线性范围宽、化学干扰少、多元素同时测定等优点，但由于仪器进样量和雾化效率受测定溶液含盐量的限制，试样前处理通常用酸分解，或碱熔后经沉淀分离除去大量可溶性盐类，用酸溶液沉淀，定容，待测。本文利用ICP上述优点对碱熔试样不经分离直接酸化，对高倍稀释试液测定铬铁矿中的主量元素进行了探讨。试验表明，此设想是可行的。本文还就试样的分解条件、酸度、元素间的光谱干扰作了研究，拟出了同时测定铬铁矿中铬、铁、镁、铝的分析方法。本法 质矿产部标准试样的结果与推荐值对照，符合要求。本法称取试样量少，试剂用量少，用银坩埚代替昂贵的铂坩埚，不经分离直接酸化后同时测定4种主量元素，大大简化了操作手续，为分析铬铁矿中主量元素的含量寻找了一条准、快、省的途径。     

浅谈油田开发钕铁硼永磁体温度和环境对其性能的影响

本文简述了工作温度和环境对油田开发用钕铁硼永磁体磁性能的影响，并探讨了改善钕铁硼永磁体耐热、耐蚀性的方法。     

Experimental Evidence of the Rapidly Increasing Neutron Yields in Proton—Induced Reaction on Heavy Target Across 0.6—1 GeV

The independent yield distribution of the Hg isotopes,measured for the reaction of 600MeV ^18O projectile with a ^nat.Pb target,is converted to 18O 208Phb system and is compared with an Hg-isotope distribution from the spallation reaction of 1A GeV^208Pb on proton.The comparison shows the differences between the two distributions on the production cross sections,isotope-distribution widths as well as their shapes.A great increase of the neutron-deficient Hg isotope yield with increase of bombarding energies of protons from 600MeV to 1GeV is derived.This fact results in an experimental evidence for rapid increasing neutron yields with rising proton bombarding energy from 0.6GeV to 1 GeV.     

Brick Walls for Nonstationary Black Holes

The validity condition of the brick-wall model is analysed in nonstationary space-time.It is shown that the model holds only in thin regions,only by using tortoise coordinates near the event horizon of a slowly varying(quasistationary)black hole.The reason for the use of tortoise cooridnates is that the stationary state solutions of quantum field equations in other coordinates do not exist for any region in nonstationary space-time.Meanwhile,the quantum corrections to the entropy of the Vaidya-Bonner black hole due to the spin fields are calculated in terms of the brick-wall model.     

Linear Cavity Erbium—Doped Fibre Laser with Tunable Wavelength Range of 112nm

We report on a linear cavity erbium-doped fibre laser with a large tuning range of 1509-1621nm.We obtain a 1dB flat tuning range of 1538-1613 nm and a 3dB tuning range of 1516-1621 nm.The threshold at 1580 nm is 6.1mW,the slope efficiency is 0.193 and the output power is 18.2mW,when 100mW pump power at 1480nm is provided.High signal-to-noise ratios of better than 60 dB are achieved within all the tuning ranges.