临海市 推进矿山有序开发保障项目石料需求

坚持统一规划。按照“因地制宜、规模开发、集约经营”的方针,编制完成《临海市矿产资源规划》,形成与全市产业布局、基础设施建设、城镇发展、新农村建设相协调的矿产资源开发格局。坚持科学布局。矿山出让前期准备过程中充分考虑“区域建设石料需求”、“矿山政策处理难易程度”、“矿山选址科学性与前瞻性”三大要素,多部门联合现场踏勘22处拟设采矿点,明确符合要求的11家拟设采矿点,目前成功出让4家矿山,合计可采石料储量3966万吨,收取采矿权有偿出让金4340万元,充分保障了74省道临海南延段、头门港疏港公路及南洋涂、北洋涂围垦等重点项目建设的石料需求。     

洞穴石笋沉积旋回主要特征的古气候环境研究

通过对我国南方大型石笋组分、结构构造的观测和董哥洞10号(D10)石笋210件碳、氧同位素组成、20个U系测年数据,以及部分微(痕)量元素的分析对比,概述了石笋沉积旋回性特征、旋回界面类型和相关的气候、环境、地质意义.以组成D10石笋的碳酸盐含碳质、黏土矿物,呈黑灰、灰黄、灰白、灰等色泽匹配、纹层厚及组合、层面呈拱形或平直分别组合或转变、构造类型、碳氧同位素组成及其组合,呈协调平行、不协调同向、不协调反向变化三类型若干亚类等,旋回性特征,确定了19个沉积旋回.根据δ13C平均值为-3.91 ‰PDB、δ18O为-6.97 ‰PDB分别为冷暖气候演变的临界(阀)值,δ13C或δ18O＞临界值者的偏重是冷,＜临界值的偏轻是热.以δ13C、δ18O组成(表1)和组合变化类型和上述旋回性特征,结合层面构造呈渐变过渡或突变,以及20个同位素年龄数据,初步认定荔波地区352 930～99 410年间沉积的19旋回,是一个较完整的冰期气候演化过程,属我国第四纪冰期系列的第五冰期,10旋回顶180 695年(推算)～15旋回顶129 890年,约5万多年是连续严寒的盛冰期,①、16分别可能是冰期早、晚时段相对温暖的间冰期.期间冷暖变化有5万年级的、10万年级的气候旋回.论证了荔波地区35～10万年间是冰期气候环境,前期17万年寒冷的气候环境,期间35万年、25万年前后更严寒,但生态基本保持正常演变的面貌,中期5万多年为极寒冷的气候环境,生态向适应冷气候环境演化,晚期3万多年为冷暖频繁突(跃)变的恶劣气候,期间生态面貌复杂,正常演替与残存、突变演替并存.     

Measurement of trace nitrate concentrations in seawater by ion chromatography with valve switching

An ion chromatographic method with a valve switching facility was developed to determine trace nitrate concentrations in seawater using two pumps, two different suppressors, and two columns. A carbohydrate membrane desalter was used to reduce the high concentrations of sodium salts in samples. In this method, trace nitrate was eluted from the concentrator column to the analytical columns, while the matrix flowed to waste. Neither chemical pre-treatment nor sample dilution was required. In the optimized separation conditions, the method showed good linearity （R〉0,99） in the 0.05 and 50 mg/L concentration range, and satisfactory repeatability （RSD〈5%, n=6）. The limit of detection for nitrate was 0.02 mg/L. Results showed that the valve switching system was suitable and practical for the determination of trace nitrate in seawater.     

日冕物质抛射的理想MHD模型研究

概括了日冕物质抛射的一些观测结果和它们与其它太阳活动现象的相关性。简要回顾了较早期日冕物质抛射的理论研究,着重介绍了最近研究得较多的理论机制,即能量储存机制,以及其中的磁通量绳突变模型与其它理论模型的MHD数值和解析研究以及相应的重要应用．     

古利库金(银)矿床的稳定同位素地球化学特征

通过对大兴安岭古利库金银矿床的成矿热液流体的温度测定和同位素组成的研究,确定该矿床属浅成低温热液类型,并将成矿作用划分为2个成矿阶段,早期阶段成矿温度240~280℃,晚期成矿温度185~235℃.成矿热液流体的氢氧同位素组:δDH2O-76‰~-94‰,δ18O-6.58‰~-14.11‰,表明成矿热液来自大气降水.矿石的硫和铅同位素组成说明成矿热液硫来自中生代火山岩,而铅是从基底落马湖变质岩系及相伴的兴凯期花岗岩类中萃取出来的.     

Growth and energy budget of juvenile lenok Brachymystax lenok in relation to ration level

We evaluated the effect of ration level(RL) on the growth and energy budget of lenok Brachymystax lenok. Juvenile lenok(initial mean body weight 3.06±0.13 g) were fed for 21 d at five different ration levels: starvation,2%,3%,4% bwd(body weight per day,based on initial mean values),and apparent satiation. Feed consumption,apparent digestibility,and growth were directly measured. Specific growth rates in terms of wet weight,dry weight,protein,and energy increased logarithmically with an increase in ration levels. The relationship between specific growth rate in terms of wet weight(SGRw,%/d) and RL(%) was characterized by a decelerating curve: SGRw=-1.417+3.166ln(RL+1). The apparent digestibility coefficients of energy exhibited a decreasing pattern with increasing ration level,and there was a significant difference among different RLs. Body composition was significantly affected by ration size. The relationship between feed efficiency rate in terms of energy(FERe) and RL was: FERe=-14.167+23.793RL–3.367(RL)2,and the maximum FERe was observed at a 3.53% ration. The maintenance requirement for energy of juvenile lenok was 105.39 k J BW(kg)-0.80/d,the utilization efficiency of DE for growth was 0.496. The energy budget equation at satiation was: 100IE=29.03FE+5.78(ZE+UE)+39.56 HE+25.63 RE,where IE is feed energy,FE is fecal energy,ZE+UE is excretory energy,HE is heat production,and RE is recovered energy. Our results suggest that the most suitable feeding rate for juvenile lenok aquaculture for wet weight growth is 2.89% bwd,whereas for energy growth,the suggested rate is 3.53% bwd at this growth stage.     

X60钢在CO2饱和盐水中缓蚀作用的研究

本文采用动电位极化、线性极化、电偶电流和高压釜挂片失重等法,研究了含氮、硫有机缓蚀剂和/或Me~(2+)对X60钢在CO_2饱和的盐水溶液中的缓蚀作用。结果表明,含氮、硫的有机缓蚀剂在缓蚀过程中,开始是以抑制阳极过程为主,随后是以抑制阴极过程为主的混合型缓蚀剂。如与Me~(2+)复配使用,能明显地提高缓蚀效能。     

气象为森林防火服务

我县位于广东省北部，南岭山脉南坡，是本省50个山区县之一。全县土地面积22．1万公顷，山地面积16．2万公顷，占73％。其中森林面积12．8万公顷，覆盖率64．2％，蓄积量509万m2。我县森林防火工作自1991年以来，利用气象信息作指导，贯彻森林防火“以防为主，积极消灭”的方针，起到了保护森林资源的重要作用．1森林高火险天气过程预报方法1990年夏，县气象局参加了市局组织的森林高火险天气过程预报会战，在统一的综合火险指数和高火险天气过程标准的基础上，结合本县历史上的森林火灾记录和气象资料，制作了翁源县森林局火险天气过程预报…     

第三讲食用菌代料栽培（下）

第三讲食用菌代料栽培（下）林日暖所谓代料栽培，即是用木屑、棉籽壳、玉米芯、作物秸杆等工农业有机废物为原料，就象种植作物一样，用人工栽培食用菌。它具有方法简便，成本低，产量高，效益大的优点。本讲简要介绍适合甘肃栽培的平菇、蘑菇、香菇三种低温型食用菌的栽...