红树植物红海榄叶化学组成研究

对红树植物红海榄叶的基本化学成分水分,灰分,灰分中酸不溶物,灰分中S(SO42-),粗蛋白,粗脂肪等及氨基酸和微量元素的组成和含量进行了系统的分析测定。其基本化学组成各成分含量分别为:水分(69.18%),灰分(3.04%),灰分中酸不溶物(0.094%),灰分中S(SO42-)(0.052%),粗脂肪(7.75%),粗蛋白(7.14%);测得了红海榄叶中17种氨基酸,其总含量为10.7mg/g,其中人体必须氨基酸有7种,占所含氨基酸总量约26%;采用全谱直读等离子体原子发射光谱仪对红海榄叶进行了31种微量元素的分析测定,测得了其中18种元素的含量,红海榄叶中含有丰富的人体必须的矿物质元素。     

河东煤田中南部煤层气地质及其勘探开发前景

通过对煤层生,储,盖,构造演化史及水文地质特征的研究,讨论了研究区煤层气开发的前景。结果表明：区内主要煤层具有良好的生气潜能,储集和盖层封盖性能,构造演化和水文地质条件是影响煤层气富集的主要因素;煤层气藏的浅部区主要以中小规模构造圈闭气藏的形式存在,深部区的较大规模的水动力圈团或复合圈闭气藏;柳林西南煤层６００～１５００ｍ埋深区域是目前进行进一步开发工作的首选区域。     

一种蠕虫叉红藻硫酸半乳聚糖的粘度特性研究

探讨红藻多糖在食品中的应用前景,对蠕虫叉红藻（Furcellaria lumbricalis）中1种硫酸半乳聚糖（FB）的粘度特性进行了研究。采用流变仪通过与标准k-卡拉胶（KCA）比较,分析FB在不同温度、pH、金属离子以及酪蛋白存在下粘度的变化。结果表明,在25～50℃下,FB水溶液的粘度随温度升高而迅速下降;在相同温度下,FB水溶液粘度稍受pH值大小的影响;钾离子和钙离子均能降低FB水溶液粘度,但Ca^2＋的加入能明显提高酪蛋白与FB混合水溶液体系粘度。由于FB和KCA粘度变化行为具有相似性,这为FB用作食品添加剂提供了有用数据。     

大地电磁信号整理分析

小波分析是具有时频多分辨率分析特点的新的信号处理方法,本文应用时间序列反映出大地电磁信号功率谱特性并比较了几种常规实验手段的分析效果,通过小波变换分离出假频所在通道并进行初步除噪,按能量强弱对信号重新截断划分．本文的目的就是尽可能的消除对各组信号不一致的影响因素(局部噪声),提取共性较强的部分并按能量的差异来划分这些信号．     

Physical weathering of marbles caused by anisotropic thermal expansion

 Marbles as building stones as well as in their natural environments show complex weathering phenomena. The most important damage scenario is based on the highly anisotropic thermal expansion coefficient α of calcite, i.e. extreme expansion parallel and contraction normal to the crystallographic c-axis. Therefore, the rock fabric and especially the lattice-preferred orientation (texture) of calcite and/or dolomite as the predominant mineral phases in marbles have a significant influence on the mechanical weathering. The textures of marbles from five different locations vary from a more or less perfect prolate to moderate oblate shape of the [006] pole figure tensor. Accordingly, the texture-derived bulk thermal dilatation anisotropy covers a broad range from –0.048 to 0.680. The modelled thermal dilatations correlate with those obtained from experimental measurements. The difference in magnitude is basically explained by the microcrack fabrics which was not considered in the computations. All samples show a deterioration due to thermal treatment regardless of the strength of texture. The directional dependence of (a) the total magnitude of the thermal dilatation coefficient and (b) of the residual strain is highest in marbles with a strong texture, whereas the Carrara marble with a weak texture exhibits a uniform crack formation. The progressive loss of cohesion along grain boundaries due to dilatancy may serve as an example for the initial stage of physical weathering. Received: 10 February 1999 / Accepted: 16 October 1999     

敲击-回波法中传感器影响的小波分析

在基桩及结构物质量的敲击-回波法检测过程中,由传感器采集的信号里除反映了被测点的速度响应外,还总是含有传感器固有特性引起的成份。首先利用数值模拟软件FLAC3D对不含传感器的桩顶速度响应进行数值模拟,再与传感器特性进行合成,得到含有传感器特性的桩顶速度响应;然后利用小波分析,研究了传感器对速度响应的影响;最后,提出了一种新的抑制传感器影响的方法--小波抑制法,结果表明：小波分析能有效地抑制速度响应中传感器的影响     

Numerical analysis of synthetic granulate deposition in a physical model study

The current study focuses on the application of a three-dimensional numerical model for the prediction of morphological bed changes. The sediment deposition in a reservoir during a 10-year-flood was investigated and the results of the simulation were validated with data derived from a physical model study. Because of the small grain sizes in the prototype, synthetic granulate was used in the physical model. The numerical computation domain was a reproduction of the physical model, including the grain sizes and the density of the particles, in order to ensure comparability. The CFD code SSIIM, which solves the RANS-equations in three-dimensions, was used for the simulations. The sediment transport in SSIIM is divided into suspended sediment transport, computed by solving the convection-diffusion equation, and bed-load transport, calculated by an empirical formula. The results of the numerical simulation correspond well to the results of the physical model study. The simulated location and the pattern of the sediment deposition in the reservoir are an accurate representation of the observed distribution in the physical model.     

Macrobenthic associations in a South Atlantic Brazilian enclosed bay: the historical influence of shrimp trawling

This study characterized the macrobenthos of Tijucas Bay and related the distribution and dominance patterns with historical trawling activities. Fifteen sampling sites were established in the bay and were sampled in summer and winter for the characterization of the macrobenthos. To evaluate the trawling effects, three passages were established at each site with control and impacted areas analyzed before and after trawl-net action in impacted area. Seasonal differences occurred in macrobenthos, possibly influenced by rainfall where the relative water level of the Tijucas River was directly associated with the discharge of freshwater and particulate matter. The associations identified in the bay were distinct in comparison with the Zimbros Embayment. The trawling assessment showed no significant variation in the macrobenthos after the trawl, possibly due to decades of shrimp exploitation in the bay. Trawling and instable environmental conditions inside the bay make the establishment of a stable macrobenthic community difficult.     

Physical and thermal treatment of phosphate ores — An overview

The annual consumption of phosphate rock approached 150 million tons. The marketable phosphate is usually 30% P₂O₅ or higher. The run-of-mine material is mostly of lower grade which needs processing or upgrading. The processing techniques of phosphate ores depend mostly on the type of associated gangue minerals present in the mined rock. In some cases, simple, inexpensive techniques are enough to produce the required grade. For example, crushing and screening is used to get rid of the coarse hard siliceous material, and attrition scrubbing and desliming is used to remove the clayey fine fraction. If silica is the main gangue material, single-stage or double-stage flotation is the conventional mineral processing technique used in this case. If the ore is igneous carbonatitic alkaline or ultra basic phosphate deposit, crushing, grinding, scrubbing, and flotation associated with other steps such as magnetic and/or gravity separation is proved to be successful in upgrading this type of ore. The sedimentary phosphate ores having carbonate-apatite as the main phosphate minerals and containing carbonates (calcite and/or dolomite) represent a challenge in the field of phosphate concentration due to similarity in the physico-chemical properties of surfaces of the ore constituents. Also, if considerable amount of organic matter constitutes the main gangue material, upgrading of the ore becomes difficult. New flotation systems (techniques and reagents) are being developed to treat these challenging phosphate ores. Furthermore, calcination is another solution for upgrading these difficult-to-treat types of ores. However, calcination is indicted with some controversial drawbacks. This overview discusses and summarizes the State-of-the-Art and the existing efforts to overcome these problems and to produce a high-grade phosphate product suitable for fertilizers and other phosphate compounds.     

暴雨落区的统计与分析研究

用34 a的降水资料对安徽省4—9月暴雨落区进行了统计分析,结果表明安徽暴雨主要集中在6月到7月,暴雨日数多寡和暴雨范围大小,基本决定了汛期降水多少和旱涝趋势。汛期暴雨落区集中出现在582—584 dagpm的500 hPa等压面斜坡上,因此暴雨带的位置预报大致可以用584 dagpm线的移动作参考。并用2003年梅雨期20场暴雨与一些实况物理量场进行对比,得出西风急流北侧以及500 hPa上升运动中心南侧到850 hPa上升运动中心北侧,有利于暴雨发生发展。