表面不均匀性黑斑的钢芯铝绞线模拟海洋环境5年腐蚀行为的研究

模拟了钢芯铝绞线在海洋环境中5年的腐蚀情况,通过腐蚀试验、X射线衍射(XRD)、X射线光电子能谱(XPS)、电化学试验(EIS,Tafel)和X射线扫描电镜(SEM)微观形貌对比分析说明,在北方城市工业集中厂区的雨季,即在工业气氛和弱高温高湿双重作用下,所生产的表面带有不均匀性黑斑的钢芯铝绞线与正常条件下生产的钢芯铝绞线,腐蚀后表面元素组成和含量基本相同,且两者电化学性能基本一致,因此可进一步确定,此钢芯铝绞线为"不影响使用、仅影响商业外观"的产品。实验研究结果可作为生产制造与使用部门进行判据的科学依据。

黑色素瘤表面不均匀性的轮廓描述与分析

为解决皮肤肿瘤表面不均匀性的度量问题,构建一种肿瘤表面灰度不均匀性的虚拟轮廓描述模型。提出虚拟轮廓不规则性和不对称性描述子,将肿瘤表面2D灰度分布的不均匀性转换为虚拟轮廓的不规则性,提取虚拟轮廓的不规则性和不对称性特征,依据Hausdorff距离进行特征选择和融合,实现基于虚拟轮廓不规则性和不对称性的肿瘤表面不均匀性分类。实验结果表明,该模型能实现数据降维,提高分类准确率。

Zn/MnO_2糊式电池的高温模拟贮存研究

贮存是各类型电池应具备的重要性能之一,贮存性能的好坏是衡量电池是否可靠的重要依据,也是评价电池性能的最主要指标之一。 Zn/MnO2糊式电池是一次性电池,经过一段时间的贮存后,电池容量比刚生产出的新电池容量低,这是由于电池自放电的缘故。Zn/MnO2糊式电池自放电有3个原因:（1）氢与氧还原引起锌极自放电;（2）锌极表面不均匀性引起锌极自放电;（3）二氧化锰电极的自放电。

The Analysis of Nano-Size Inhomogeneities of Substrate by Surface Electrons over Superfluid Helium Film

The surface quality of the substrate is a crucial factor in building ＂clean＂ quantum-dimensional systems. There are a number of micro-nano metric methods for the analysis state of surface： the atomic force microscopy, the scanning tunneling microscopy and others. The SE （surface electron） over substrate has a ＂soft＂ hydrogen-like spectrum in the normal direction and the SEs mobility along is sensitive to the inhomogeneities of the substrate and this is analyzed in work. The values of electron mobility and energy of thermal activation are basic parameters of transport process which essentially depend on the helium film thickness. For analysis of nano-size inhomogeneities of substrate here we apply a new method providing a uniformity of the film thickness on substrate and fixing of measuring cell with supply wires. The plunger with electro-mechanic driver into a hermetic chamber is used for variation the helium level and consequently the film thickness. Considering values the conductivity and the variation of potential along surface is estimated the effective size of roughness from several nanometers （for non-saturated helium film） to 10^2 nm （for saturated film）.

Effects of mixture inhomogeneity and combustion temperature on soot surface activity and soot formation in diesel engines

The soot surface growth plays significant role on the soot mass accumulation,which starts with H(hydrogen)atom abstraction forming activated soot surface sites,and is followed by the acetylene addition process.In this study,the effect of the mixture inhomogeneity and combustion temperature on the soot surface activity and soot formation was investigated by developing a new multi-step phenomenological(MSP)soot model of diesel engines.A new detailed soot surface growth mechanism was proposed by correlation analysis of combustion parameters with soot formation.The inhomogeneity coefficient of soot surface activityαCH and the specific rate of soot surface growth R CH were derived to highlight the effect of inhomogeneity of mixture and combustion temperature on soot formation.The predicted diesel engine-out soot agreed well with experimental findings in wide ranges of combustion conditions.In the case of lower engine load with single fuel injection and higher EGR(exhaust gas recirculation)rate,it had quiet homogeneous mixtures before ignition when the combustion temperature dominated the soot surface activity.At medium engine load with multi-pulse fuel injections,it got mixture slightly stratified before ignition and revealed that the mixture inhomogeneity became more dominated on soot surface activity than the combustion temperature.An increased soot surface activity led to increased soot emission.Under the full engine loads with single fuel injection but quite high boost pressure over 0.4 MPa,it led to the combustion conditions of higher mixture density and higher mixture heat capacity,which benefits the mixture homogeneity.The decay rate of soot surface activity became lower due to the decreased combustion temperature and the soot surface activity decreased due to improved mixture homogeneity.In addition,the lowered intake oxygen concentration due to usage of EGR played a role to lower the specific rate of soot surface growth R CH,but to increase the soot surface activityαCH.

Multi-hybrid method for investigation of EM scattering from inhomogeneous object above a dielectric rough surface

An iterative strategy combining Kirchhoff approximation （KA） method is presented in this paper to study the interactions between KA is applied to study scattering from underlying rough surfaces with the hybrid finite element-boundary integral （FE-BI） the inhomogeneous object and the underlying rough surface. whereas FE-BI deals with scattering from the above target. Both two methods use updated excitation sources. Huygens equivalence principle and an iterative strategy are employed to consider the multi-scattering effects. This hybrid FE-BI-KA scheme is an improved and generalized version of previous hybrid Kirchhoff approximation-method of moments （KA-MoM）. This newly presented hybrid method has the following advantages： （1） the feasibility of modeling multi-scale scattering problems （large scale underlying surface and small scale target）; （2） low memory requirement as in hybrid KA-MoM; （3） the ability to deal with scattering from inhomogeneous （including coated or layered） scatterers above rough surfaces. The numerical results are given to evaluate the accuracy of the multi-hybrid technique; the computing time and memory requirements consumed in specific numerical simulation of FE-BI-KA are compared with those of MoM. The convergence performance is analyzed by studying the iteration number variation caused by related parameters. Then bistatic scattering from inhomogeneous object of different configurations above dielectric Gaussian rough surface is calculated and the influences of dielectric compositions and surface roughness on the scattering pattern are discussed.