浅谈湿陷性黄土地基处理方法

本文分析研究了湿陷性黄土地基处理方法的重要性,指出湿陷性黄土处理的基本原则,对比研究各种地基处理方法的适用情况及优缺点,并结合工程实例进行了论证。     

甚宽频带地震计频域标定的噪声数据处理方法

分析了频域标定中的噪声及传统数据处理方法，提出数据处理的本质是噪声处理的观点，探讨了不同噪声的不同处理方法，详细研究了长周期非线性漂移的噪声处理方法，有效地提高了频域标定精度。     

西宁地区盐渍土盐胀特性及其地基处理方法探讨

针对西宁地区盐渍土的特殊工程地质性质,就其地基处理方法通过数个工程实例从场地的盐渍土特点及其地基处理进行了分析探讨,提出了该类地基通过碎石桩及碎石垫层等处理方法和经验。     

填海成陆的地基处理

文章介绍了填海形成陆域的地基处理方法,即清淤换填→加密处理。指出对不同填料形成的地基层位采用不同方法分别进行处理,可以更有效地加固地基并降低成本。     

注浆法在黄土地区公路路基洞穴处理中的应用

研究了注浆法在黄土地区公路路基洞穴处理中的加固机理及技术指标.黄土地区公路中的洞穴对公路的安全运营常造成严重危害,同时对于这类洞穴的处理尚缺乏有效的方法.在大量调查和参考前人研究成果的基础上,将注浆法用于路基中洞穴的处理,提出了注浆法加固的主要设计参数,通过对施工现场黄土洞穴注浆处理效果分析,认为该方法具有良好的处理效果.     

华南山间谷地型软土的特性及处理方法

文章对华南山间谷地型软土的特性、勘察方法进行了分析 ,并对工程施工中软土的处理方法进行了一些探讨 ,提出应用多种手段准确勘察软土特性和多种软土地基处理方法 ,可以有效保证软土分布区域工程质量。     

矿山固体废弃物的处理

论述了矿山固体废弃物的预防与处理,提出了清洁生产、堆放与填埋、综合利用3种处理矿山固体废弃物的思路和方法.     

非接触智能卡安全攻击方法研究

随着非接触智能卡的广泛应用,其安全问题也越来越突出。研究了一种非接触智能卡DES密码算法的侧信道安全攻击方法,设计了非接触智能卡密码的侧信道安全攻击流程,研究了信号的采集和处理方法,并对处理后的最终信号进行安全攻击。论文设计了3种信号处理过程,并分别对这3种处理后的曲线进行了攻击操作。最终攻击结果证明了提出的非接触智能卡安全攻击方法是可行的,同时也表明信号处理在非接触智能卡安全攻击中的重要性。     

地震计时域标定的噪声数据处理

分析了在甚宽频带地震计的时域标定中存在的各种噪声，探讨了相应的处理方法，重点阐述了对阶跃标定影响最大的长周期漂移噪声的处理方法——漂移曲线拟合法。     

强夯法在广西沿海地区地基处理中的应用

文章根据强夯法在广西沿海地区地基处理的工程实践,对强夯法在碎石土、砂土地基加固处理的理论与方法方面作了分析,认为强夯法地基处理可以在广西沿海地区广泛使用.     

某工程静压桩基高应变动力试验与分析

文章介绍了高应变动力试桩的基本原理,并通过高应变动力试桩技术在某静压桩基工程中的应用,分析受挤土效应不利影响下基桩的桩身质量和承载力变化,为处理该类问题提出了一些办法和体会,同时也说明了高应变动力试桩技术解决桩基工程问题的能力.     

高应变动力试桩法在大桩检测中的应用效果

通过实例表明高应变动力试桩法在高层建筑大桩检测中取得令人满意的应用效果.     

Changes in Huanghe （Yellow） River estuary since artificial re-routing in 1996

With the combination of historical data, field observations and satellite remotely sensed images(Landsat TM/ETM and CBERS), changes in Huanghe (Yellow) River estuary since 1996 when artificial Chahe distributary was built up were studied, mainly including water and sediment discharge from the river, tides, tidal currents, suspended sediment diffusion, coastline changes and seabed development. During following six and half years (up to the end of 2002), runoff and sediment loads into the river mouth declined dramatically. At the beginning of the re-routing, abundant sediment loads from the river filled up nearshore shallow water areas so that the newborn delta prograded quickly. With rapid decrease of sediment loads transported to the estuary, the delta retrograded. In 1997, subaerial tip of the abandoned delta receded 1.5km; its annual mean recession rate was about 150 m in following years. In addition, marine dynamic condition near the artificial outlet had also changed. Under the interaction of ocean and river flow, most of incoming sediment loads deposited in the vicinity of the outlet. Seabed erosion occurred at the subaqueous delta front. Between 1999 and 2002, erosion thickness averaged at 0.3 m in the subaqueous delta of 585.5 km2.     

In-situ determination of sediment oxygen demand in cultivation ponds

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Microhabitat Effect on Iron Distribution and Transfer in Carex pseudocuraica in Sanjiang Plain Wetlands

Ten clonal units of Carex pseudocuraica growing in four different microhabitats (perennial flooded ditch water,perennial flooded ditch sediment,seasonal flooded ditch sediment and perennial flooded soil) of the Sanjiang Plain,Northeast China,were collected randomly for phenotypic plasticity analysis.Iron content,chemical and physical properties of substrates and the total Fe of nine plant modules were measured as well.The results show that the performance of the C.pseudocuraica is affected by the microhabitat,with the greatest performance score in perennial flooded ditch water,and the lowest in perennial flooded soil.The biomass allocation indexes indicate that much more mass is allocated to stems and roots to expand colonization area.The distribution of the total Fe in plant modules appears as pyramids from the tip to the root,while marked differences are observed in the distribution proportion of stems,tillering nodes and roots that are allometrically growing.Iron transfer from substrates to the plant is mainly controlled by the substrate type.The differences of iron distribution and transfer in the plant in different microhabitats are attributed to the iron contents of the substrates as well as the phenotypic plasticity of the plant.     

Microhabitat effect on iron distribution and transfer in <Emphasis Type="Italic">Carex pseudocuraica</Emphasis> in Sanjiang Plain Wetlands

Ten clonal units of Carex pseudocuraica growing in four different microhabitats (perennial flooded ditch water, perennial flooded ditch sediment, seasonal flooded ditch sediment and perennial flooded soil) of the Sanjiang Plain, Northeast China, were collected randomly for phenotypic plasticity analysis. Iron content, chemical and physical properties of substrates and the total Fe of nine plant modules were measured as well. The results show that the performance of the C. pseudocuraica is affected by the microhabitat, with the greatest performance score in perennial flooded ditch water, and the lowest in perennial flooded soil. The biomass allocation indexes indicate that much more mass is allocated to stems and roots to expand colonization area. The distribution of the total Fe in plant modules appears as pyramids from the tip to the root, while marked differences are observed in the distribution proportion of stems, tillering nodes and roots that are allometrically growing. Iron transfer from substrates to the plant is mainly controlled by the substrate type. The differences of iron distribution and transfer in the plant in different microhabitats are attributed to the iron contents of the substrates as well as the phenotypic plasticity of the plant.     

Improved AHP method and its application in lake environmental comprehensive quality evaluation a case study of Xuanwu Lake, Nanjing, China

The relative importance of each pollution factor in analytical hierarchy process (AHP) method comes from pooling expert opinions in general. Because expert opinions are based on information and judgment criteria, determining their weight may lead to uncertainty.. Therefore, an improved AHP method had been developed. The process of the improved AHP method involved four key procedures. The weights of pollution factors were completely related to the objective monitoring data through the standardization of these procedures. The environmental comprehensive quality of water and sediment of Xuanwu Lake, Nanjing, China had been evaluated. The environmental quality comprehensive indices (EQCI) of the water in 1991-1995 and 1996-2000 were 3.32 and 1.85, respectively, indicating that the water quality improved. The EQCI of the sediment in 1995 and 2000 indicates that the sediment contamination decreased from 1995 to 2000. Such results agreed with the fact that the lake had been under comprehensive control. However, with the classical AHP method, the EQCI of the sediment in the northwestern part of the lake may have indicated that sediment contamination increased from 1995 to 2000. The discrepancy may have resulted from the judgment difference of the experts. The improved AHP method can avoid arbitrariness of subjective judgment and can reflect the real influential factors of environment pollution in different periods or regions.     

Inhibition of norsolorinic acid accumulation to Aspergillus parasiticus by marine actinomycetes

Thirty-six strains of marine actinomycetes were isolated from a sample of marine sediment collected from the Yellow Sea and evaluated in terms of their inhibitory activity on the growth of Aspergillus parasiticus and the production of norsolorinic acid using dual culture plate assay and agar diffusion methods. Among them, three strains showed strong antifungal activity and were subsequently identified as Streptomyces sp. by 16S rRNA gene sequencing analysis. The supernatant from the fermentation of the MA01 strain was extracted sequentially with chloroform and ethyl acetate, and the activities of the extracts were determined by tip culture assay. The assay results show that both extracts inhibited mycelium growth and toxin production, and the inhibitory activities of the extracts increased as their concentrations increased. The results of this study suggest that marine actinomycetes are biologically important for the control of mycotoxins, and that these bacteria could be used as novel biopesticides against mycotoxins.     

Dynamic hydraulic jump and retrograde sedimentation in an open channel induced by sediment supply: experimental study and SPH simulation

Mountainous torrents often carry large amounts of loose materials into the rivers, thus causing strong sediment transport. Experimentally it was found for the first time that when the intensive sediment motion occurs downstream over a gentle slope, the siltation of the riverbed is induced and the sediment particles can move upstream rapidly in the form of a retrograde sand wave, resulting in a higher water level along the river. To further study the complex mechanisms of this problem, a sediment mass model in the framework of the Smoothed Particle Hydrodynamics(SPH) method was presented to simulate the riverbed evolution, sediment particle motion, and the generation and development of dynamic hydraulic jump under the condition of sufficient sediment supply over a steep slope with varying angles. Because the sediment is not a continuous medium, the marker particle tracking approach was proposed to represent a piece of sediment with a marked sediment particle. The twophase SPH model realizes the interaction between the sediment and fluid by moving the bed boundary particles up and down, so it can reasonably treat the fluid-sediment interfaces with high CPU efficiency. The critical triggering condition of sediment motion, the propagation of the hydraulic jump and the initial siltation position were all systematically studied. The experimental and numerical results revealed the extra disastrous sediment effect in a mountainous flood. The findings will be useful references to the disaster prevention and mitigation in mountainous rivers.     

ANALYSIS AND DISTRIBUTION FEATURES OF BENZOTHIOPHENE IN SEDIMENTS OF NANSHA ISLANDS SEA AREA

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