大红山铜矿岩体结构调查分析

大量工程实践已证明岩体结构是控制岩体稳定性的重要影响因素。为此，以大红山铜矿为研究背景，在选定有代表性调查地段的基础上，引入详细观测线法对其岩体结构进行了详细调查与统计。分析结果表明：调查区域内巷道岩体节理裂隙比较密集和发育，主要发育有倾向N53E、走向N37W、倾角53°，倾向W26S、走向N36W、倾角68°；倾向E1S、走向NIE、倾角89°的三组优势结构面，其中优势结构面第二组和第三组构成不稳定块体，并且断层及软弱夹层比较发育，加剧了巷道的破碎程度，对巷道围岩的稳定性有控制作用。最后提出了在巷道施工中密切注意围岩稳定性变化，避免工程事故的发生的建议。     

夏热冬冷地区高舒适度低能耗建筑新技术

文章通过对夏热冬冷地区建筑节能应考虑的因素及相关技术指标,及高舒适的低能耗技术构成等方面的论述,从理论和实践中加以分析了目前建筑节能面临的问题和误区,从技术角度分析入手,提出了相应的解决措施和方法,以达到舒适和节能的要求为目的.同时还从另一个方面提醒购房者在购房时要增强节能意识,警惕假节能.     

高速公路水毁成因及防治措施

从高速公路水泥混凝土路面裂缝，挖方地段护面墙开裂、拦水带与路面衔接部位裂缝，急流槽水泥砂浆勾缝脱落等方面分析了高速公路水毁的成因，并提出了切实可行的防治措施，保证了高速公路的正常运营。     

深基坑重力式沙袋堆叠挡土工程的实践

本文介绍了湛江金辉煌综合楼工程的深基坑应用沙袋堆叠作挡土结构的设计与施工     

The distribution of nutrient elements in cell wall and other fractions of the herbage of some grasses and legumes

The distribution of 10 nutrient elements was assessed in three fractions of herbage samples of perennial ryegrass, tall fescue, white clover and lucerne. The cell wall fraction, prepared by mechanical disintegration of undried material, contained the following proportions of the total herbage content of the major elements: N, 2.9–16.4%; P, 3.0–6.9%; S, 3.6–17.2%; Ca, 11.3–51.8%; Mg. 6.4–27.6% and K, 0.1–1.7%. Substantial though more variable proportions of the trace element cations, Fe, Mn, Zn and Cu were also present in the cell wall fraction. The extent to which the elements were soluble in water was assessed by analysis of the water-insoluble fraction prepared from freeze-dried samples of each herbage. The proportions of the total herbage content of the major elements soluble in water were: N, 30–57%; P, 80–92%; S, 35–71%; Ca, 48–69%; Mg. 65–83% and K, 90–96%. With the trace element cations the proportions soluble in water were more variable, though they were generally less than 70% of the total. The extent to which the various elements were soluble in 80% aqueous ethanol was assessed by analysis of the insoluble fraction prepared from freeze-dried materials. With each of the major elements, smaller proportions of the total herbage content were soluble in 80% ethanol than in water, which may reflect in part the lower solubility of proteins and pectin. With the trace element cations, the differences in solubility between 80% ethanol and water were generally small and inconsistent.     

探地雷达在莲花电站二坝坝顶路面裂缝探测中的应用

介绍探地雷达探测方法,探讨使用高频探地雷达探测粘土心墙堆石坝坝顶混凝土路面裂缝,达到快速、无损查明坝顶混凝土裂缝的性质与成因的目的.     

防止大型筒类薄壁件冷裂的工艺措施

采取了加强铸件薄弱断面处强度和提高砂芯整体“宏观”退让性八项工艺措施，有效地防止大型筒类薄壁件冷裂纹缺陷     

试论武汉建筑工地墙体广告的发展、存在问题与对策

随着社会的发展,建筑工地墙体广告以其独特的创意和表现成为城市一道亮丽的风景线。城市管理和文化宣传部门也在为如何通过城市建筑工地墙体广告展现城市特色文化而动足脑筋,使之成为能够吸引人们眼球的一道独特的文化景观。本文从介绍建筑工地墙体广告的发展状况入手,阐述了武汉市建筑工地墙体广告发展中所存在的一些问题,并针对目前存在的问题提出了相应的对策。     

管无芯弯曲中塑性变形规律的研究

通过大量管材弯曲试验,分析了沿弯曲线的切向和管壁厚方向的应力应变状态,给出弯管内、外侧管壁厚变化量和切向应变的近似计算公式。在后续试验的基础上,逐步将修正公式适用于实际生产。同时,为管材弯曲成形机理研究作了相应的基础准备工作。     

Characterization of wet microalgal cells pretreated with steam for lipid extraction

Steam pretreatment was employed to disrupt microalgal cells for lipids extraction.Effects of steam pre-treatment on microstructure of microalgal cells were investigated through scanning electron microscopy(SEM) and transmission electron microscopy (TEM).Effect of treatment on lipid extraction was also stud-ied.Microalgal cell walls were distorted after steam pretreatment due to the hydrolysis of organic macro-molecules contained in cell wall.Maximum curvature was increased from 1.88 × 10-6 m-1 to 1.43 × 10-7 m-1 after treatment with the steam at 130 ℃.The fractal dimension of microalgal cells increased from 1.25 to 1.30 after pretreatment for 15 min,and further increased to 1.47 when the pre-treatment time was increased to 60 min.Increased steam pretreatment temperature and time enhanced the hydrolysis of organic macromolecules,and finally destroyed microalgal cell walls at pretreatment temperature of 130 ℃ and pretreatment time of 60 min.Lipid extracted from wet microalgal was signif-icantly increased (2.1-fold) after pretreatment.