浅析施工企业财务风险与化解

在建筑业竞争激烈的今天,施工企业面临的财务风险与日俱增,结合施工企业的特点及所面临的财务风险,对如何规避与化解财务风险进行探讨.     

桩周弹簧单元模拟对塔建筑自振特性的影响

以一座观光塔建筑为例，利用大型有限元程序对桩周弹簧单元的不同模拟方法所计算出的自振特性结果进行了分析、比较，为今后正确、合理地计算类似问题提供了理论依据。     

Evaluation of chemical indicators for tracking and apportionment of phosphorus sources to Table Rock Lake in Southwest Missouri, USA

This work evaluated the suitability of selected chemical species as indicators for tracking and apportionment of point and non-point phosphorus sources within the Table Rock Lake watershed in Southwest Missouri, USA. The species were evaluated with respect to their uniqueness to specific source types, their ability to be detected in both sources and receiving waters, and the consistency of their concentration ratios to phosphorus. Four sampling events were conducted at 15 sample locations in one year to collect water samples for measuring the concentrations of total and dissolved phosphorus, seven anions, and 19 major and trace elements. Current analytical methods were sensitive enough for quantification of most of the chemical species in both sources and the receiving waterbody. Due to the high seasonal variation of phosphorus concentrations in source samples, no chemical species had consistent concentration ratios to phosphorus across source types. However, several chemicals were found to be unique to specific sources; bromide ion can be used as a unique indicator for the effluent of the largest wastewater treatment plant in the watershed.     

基于Surfacelet变换的井下图像融合技术研究

首次将Surfacelet变换算法应用于井下图像融合。通过多方向分解和树结构滤波器组(3D-DFB)实现图像的不同尺度、不同频率方向的分解。对高低频子带系数采用不同的加权规则进行融合。既保留了Surfacelet变换的多分辨率特性,又具有平移不变性。实验结果表明,相对于传统的变换法,取得了更佳的融合效果。     

气流床气化技术在我国的应用现状及发展前景

近年来，煤气化技术不仅在化工方面取得了巨大的发展，同时在燃烧和再燃降NOx方面也有了良好的研究成果。作为第二代煤气化技术的核心，气流床技术具有其独特的特点和明显的优势。文章综述了现行的几大气流床气化技术，分析其各自的特点和气化炉的运行条件等，同时对各炉型的产业化应用情况加以说明，给出了几大气流床技术的详细对比。最后，对气流床今后的发展提出了相关建议。     

Anticoagulant, Antioxidant and Antitumor Activities of Heterofucans from the Seaweed Dictyopteris delicatula

In the present study, six families of sulfated polysaccharides were obtained from seaweed Dictyopteris delicatula by proteolytic digestion, followed by acetone fractionation and molecular sieving on Sephadex G-100. Chemical analyses demonstrated that all polysaccharides contain heterofucans composed mainly of fucose, xylose, glucose, galactose, uronic acid, and sulfate. The fucans F0.5v and F0.7v at 1.0 mg/mL showed high ferric chelating activity (～45%), whereas fucans F1.3v (0.5 mg/mL) showed considerable reducing power, about 53.2% of the activity of vitamin C. The fucan F1.5v presented the most prominent anticoagulant activity. The best antiproliferative activity was found with fucans F1.3v and F0.7v. However, F1.3v activity was much higher than F0.7v inhibiting almost 100% of HeLa cell proliferation. These fucans have been selected for further studies on structural characterization as well as in vivo experiments, which are already in progress.     

泗许高速公路路面材料设计与控制标准

泗许高速公路路宿州段根据安徽省改革发展委员会文件2005年批准立项，并于2006年完成施工图设计，计划2013年年底泗许高速公咯最后一段泗县段将建成通车。泗许高速公路的建设，前后经历8年多时间，见证了我省高速公路在淮北平原上修建高速公路的技术发展，     

火工烟火机械装置功能可靠性测定

本文用一种全新的方法，评估了火工烟火装置的机械性能，并预测了火工烟火装置的机械功能可靠性。文章中没有讨论其它可能的失效模式，诸如火工烟火能源的起爆之类。运用目前人们普遍采用的go/no-go统计方法对同一部件的可靠性进行预测时，常常需要做成百上千次连续的、成功的试验，而且还经常会自然而然地忽略其物理失效性。本文所要介绍的方法一开始是要计量、了解并控制机械特性参数；然后，将实现功能所需要的能量与火工烟火能源所传递的能量进行比较，确定机械功能裕度；最后，运用小量样品统计法，对在确定功能裕度过程中所采集到的数据进行分析，预测机械功能可靠性。与go/no-go统计法相比较，认真仔细地运用这一方法将大大地减少实验开支，并能更好地了解产品性能。运用这一方法可以确定变量的特性和效果，而且只需要对20套或者更少的样品进行评估，便可预知其可靠性。文章举例说明了在NASA成功的飞行任务中，用此方法对其拔销器所进行的评估。