使用E601B型蒸发器应注意的几个问题

目前,湖北省国家基准、基本站都已开始使用E601B型蒸发器测量水面蒸发,并与原使用的小型蒸发器对比观测。由于大型蒸发器结构较为复杂,影响其观测资料的准确性因素很多,加之使用时间不长,因此,使用中须注意的问题较多。在此,笔者就使用E601B型（以下简称大型）蒸发器中的几个问题谈谈个人的看法。     

北岭金矿中的针碲银金矿的研究

针碲银金矿产于北岭金矿的晚期矿化阶段，赋存于梳状排列网脉状的石英中，与自然金伴生。矿物组合为针碲银金矿－自然碲－碲铅矿－自然金－石英和针碲银金－碲镍矿－碲铅矿－石英，自然碲，碲镍矿，碲铅矿在针碲银金矿中呈包裹体产出。针碲银金矿呈柱状，板状，粒状晶形，聚片双晶，具强非均质性及双反射和反射多色性，ＨＶ５０＝２１６－２１９ｋｇ／ｍｍ＾２，其化学成分：Ａｇ１０．５８％－１２．３６％，Ａｕ２３．７０％－２４     

碳酸盐岩地区红土针铁矿中铝对铁的置换作用及其环境意义

针铁矿是地表分布最广的氢氧化铁矿物，针铁矿的结构、成分和形态等特片，在一定程度上反映了某形成环境特征及其变化。根据作者提出和设计的红土中氧化铁矿物分离和分析程序，运用Ｘ射线衍射分析，红外光谱和电子探针等方法研究了贵州碳酸盐岩红土中针铁矿的铝类质同像置换作用。     

旋转针锥光下一光轴出露时快速测定2V的图解

为了简化旋转针锥光下一光轴出露时测定2V的赤平投影法的绘图手续,设计了本图解,只要测取θ,R,R′与φ四值,就能更快地求得2V值。     

芒针治疗良性前列腺增生症下尿路症状33例

目的：观察芒针治疗良性前列腺增生症（BPH）引起的下尿路症状的临床疗效。方法：将66例BPH患者随机分为治疗组和对照组,每组各33例。对照组予以常规针刺疗法,治疗组在对照组基础上加用芒针（秩边透水道）针法,配以补泻手法,2组均治疗1次/d,以6次为1个疗程,连续治疗2个疗程。观察2组治疗前后国际前列腺症状评分（IPSS）和生活质量指数（QOL）评分,并评价综合疗效。结果：最终纳入治疗组32例,对照组31例。总有效率治疗组为90.6%（29/32）,高于对照组的71.0%（22/31）,2组比较,差异有统计学意义（P＜0.05）。2组IPSS、QOL评分治疗前后组内比较及治疗后组间比较,差异均有统计学意义（P＜0.05）。结论：芒针（秩边透水道）疗法可改善BPH患者相关的下尿路症状,值得临床推广。     

Characterization of Iron Grains near the P/T Boundary in the Meishan Section of China

The Meishan section of China has been confirmed as the ＂Global Stratotype Section and Point＂ of the P/T boundary. In the section, the authors found several types of iron grains, including pyrite, pure iron grains and goethite. From the research of macro minerals, it is easy to find that the grains rich in iron appear from the bottom of the event layer of the section. In other words, it is probably residue of the geochemical catastrophe of that time. Therefore, it is important to trace the source of these iron grains and their relationships, which probably provides evidence for volcanic eruption or impact-volcanoes and has directive significance to the crisis during the P/T transitional period. Through the study of the characterization and relationships of these iron grains, the authors make a preliminary discussion on the P/T mass extinction.     

A Study of Chromium Adsorption on Natural Goethite Biomineralized with Iron Bacteria

Goethite, especially biogenic goethite, has high specific surface area and great capacity for the adsorption of many contaminants including metal ions and organic chelates. Chromium is a redox actively toxic metal ion that exists as either Cr^Ⅲ or Cr^Ⅵ in nature, and as such it is essential to understand its behavior of adsorption on natural goethite mineralized by iron bacteria, as Gallionella and Leptothrix in water body. The adsorption of Cr^3＋ and Cr^Ⅵ on naturally biomineralized goethite is studied in this paper. The results show that both Langmuir and Freundlich adsorption isothermal models are able to accurately describe the adsorption of these two ions. Investigation of SEM/EDS, TEM/EDS indicates that the two ions do not adsorb homogeneously on goethite owing to the different microstructures of goethite, and that the microspherical goethite has a greater adsorption capacity for chromium ions than the helical one. XPS data show that redox reaction of chromium on the surface of biomineralized goethite takes place in the adsorption of both Cr^3＋ and Cr^Ⅵ. The CrvI adsorbed on biogoethite is much easier to transform into CrIII than the oxidization of Cr^Ⅲ on the bio-goethite.