Altération et rupture d'échantillons d'argilite lors de sollicitations thermomécaniques en conditions humides contrôlées

The objective of this work was to undertake creep tests on shale and describe the microtextural phenomena which initiate internal damage/rupture under thermomechanical loading and relative humidity conditions. The CGI test cell is a system developed at the Centre de Geologie de l'Ingénieur specifically to allow observation of the fabric of a thick slide (50×40×5?mm) at different magnifications during the test. The CGI test cell imposes both an axial and a planar strain on the sample. The first step is to prepare a thick slide from a core and to describe its "initial" state. The second stage is to undertake a creep test to rupture, while the third step is to study the fragments of the ruptured material using XRD (X-ray diffractometry), SEM (scanning electron microscopy) and EDS (energy dispersive spectrometry). The samples studied are from the shales of the Callovo-Oxfordian of the Paris Basin, to the south of Bar-le-Duc in the east of France. These rocks consist of clay minerals (illite and kaolinite), quartz, calcite (22.8%), dolomite, feldspar and pyrite (1%). The pyrite is essentially found in the bioclasts. The creep test is carried out under thermomechanical loading with an axial stress of up to 12?MPa and a temperature rising to 80??°C. The relative humidity is maintained at more than 90%. After 33?days the axial strain reached 0.76%, with rupture of the thick slide occurring 10?days later. The deformation was related to the texture/heterogeneity of the rock and occurred mainly along fissuring. Rupture also occurred along bedding planes, particularly where oxidized pyritic bioclasts were present. The chemical phenomena noted were in part related to the formation of iron hydroxides and sulphuric acid. This reacts with the calcite to form gypsum, which has a lower density than the original pyrite and calcite. The XRD indicated that the iron hydroxides observed on the discontinuities are dominantly limmonite. Examination of the SEM and EDS suggested an increase in porosity, even at some distance from the macroscopic fissures.     

Color tracking with contextual switching: real-time implementation on CPU

Journal of Real-Time Image Processing - The paper proposes contributions for mean-shift (MS) and covariance tracking (CT), and makes these two complementary methods cooperate. While MS runs fast...     

Weibull Parameters and the Tensile Strength of Porous Phosphate Glass-Ceramics

The strengths of porous phosphate glass-ceramic specimens, with relative densities ranging between 0.25 and 0.50, were measured by four-point bending at room temperature. An analysis of the data, using Weibull statistics, indicated that such a treatment, usually performed on dense ceramics, can also be used on porous materials. In the sets studied, the nature of critical flaws was determined, which led to the proposal of a mechanism of fracture initiation in such porous materials.     

基于PPPoE协议的宽带接入网技术分析

PPPoE协议定义了在以太网中传输PPP协议帧的方法，它既利用了以太网的便利性又实现了PPP协议的点对点特性．由于PPPoE协议在用户管理、用户认证和计费等方面具有较大的优势，所以越来越多的宽带接入网采用基于PPPoE技术的解决方案．文中首先论述PPPoE的产生背景，分析该协议的本质和工作原理．然后介绍典型的基于PPPoE协议的宽带接入网模型，并分析一个依据此模型构建的接入网实例．最后，总结PPPoE接入方式的优点和缺点．     

VC＋＋环境下土工试验数据管理系统的实现

重载和继承机制是C＋＋语言中两个很重要的特性,本文结合岩土工程中工试验的实例,详细介绍了对这两个特性的灵活运用,并就如何派生自己的新类和如何将自己的类融合到MFC应用框架中去作较深入的分析。     

液力变矩器扭转动态特性分析及试验辨识

通过理论分析建立了液力变矩器的分段线性化扭振计算模型,并对其进行了简化.采用实验参数辨识的方法,借助Matlab/Ident工具箱,得到了系统的频率特性,通过逐段线性化方法,确定了系统的参数模型,从而确定了模型中的阻尼参数.通过曲线拟合得到了阻尼随转速比的变化曲线.为了验证辨识精度,取转矩为输入量,转速为输出量,利用Matlab/Ident工具箱比较了辨识和试验的输出结果,表明所建立的模型是准确的,辨识得到的阻尼值具有一定的精度.     

中国传统服饰观

中国传统服饰是礼的重要载体 ,是礼制的表现形式 ,在款式、色彩和纹样上追求精神寓意和象征意义     

Rice mutation after flown in space

0　ＩＮＴＲＯＤＵＣＴＩＯＮＮｅｗ ｇｅｎｏｔｙｐｅｓａｒｅｉｎｓｔｒｏｎｇｄｅｍａｎｄｔｏｓａｔｉｓｆｙｈｕｍａｎｎｅｅｄｓａｎｄｅｎｖｉｒｏｎｍｅｎｔａｌｆａｃｔｏｒｓｉｍｐｏｒｔａｎｔｆｏｒｐｌａｎｔｇｒｏｗｔｈ ,ｅ .ｇ .,ｐｈｙｓｉｃａｌｃｏｎｄｉｔｉｏｎｏｆｓｏｉｌ,ｎｕｔｒｉ ｅｎｔｓ,ｔｅｍｐｅｒａｔｕｒｅ ,ｐｌａｎｔｐａｔｈｏｇｅｎｓ ,ｅｔｃ .,ａｒｅｃｈａｎｇ ｉｎｇａｌｌｔｈｅｔｉｍｅ .Ａｌａｒｇｅｇｅｎｅｐｏｏｌａｖａｉｌａｂｌｅｉｓｅｓｓｅｎ ｔｉａｌｆｏｒｐｌａｎｔｉｍｐｒｏｖ…     

自适应分割弱边缘的活动轮廓模型

改进LI的保持距离水平集方法,提出自适应分割弱边缘的活动轮廓模型,并证明自适应力的双向性。模型中自适应力的系数加入图像的灰度均值,根据演化曲线的位置自适应的收缩或扩张。结果表明,该方法克服了原LI模型初始轮廓必须完全包围或含在目标物体内的问题,可以任意设置初始轮廓大小及位置,能够分割多目标图像,具有较强的抗噪性。     

虾青素及其他类胡萝卜素的生物合成研究

应用高效液相色谱对法夫酵母合成产物中的虾青素和其他类胡萝卜素进行了定性和定量分析 ,并通过分析葡萄糖底物与代谢中间产物乙醇及总虾青素的含量变化对法夫酵母生物合成虾青素进行了研究