鄂尔多斯盆地东南部长7油层组沉积相研究

为了明确鄂尔多斯盆地东南部长7油层组沉积体系类型和沉积相展布特征,总结其沉积演化规律,以沉积学的基本原理和方法为指导,综合运用地球化学、盆地分析等理论和方法,通过野外露头、钻井、测井等资料的综合分析,认为鄂尔多斯盆地东南部长7油层组主要发育三角洲和湖泊沉积体系,可进一步划分为3类亚相,其中以三角洲前缘和深湖2种亚相为主．     

高等代数在线性规划问题求解中的应用

高等代数课程是数学类本科阶段最基本的核心课程之一,不仅是初等代数的延拓,也是后续课程——运筹学,尤其是线性规划部分的基础。运用高等代数知识求解了线性规划问题:利用线性规划问题标准型的线性约束条件是线性方程组的特点,从线性方程组的角度分析了可行解与最优解;利用线性规划问题标准型的矩阵形式,根据矩阵的知识推出基可行解与目标函数值的表达式,以及最优解的判别准则,并讨论了矩阵初等变换与单纯形法的联系。同时通过一个典型实例说明了以上各分析的正确性。     

单极性倍频SPWM波形生成及其谐波分析

单极性倍频SPWM调制技术具有输出波形谐波抑制能力好,输出波形脉动频率高而开关管的损耗并不增加等优势.综合分析了四种单极性倍频SPWM算法,并用MATLAB进行了谐波分析,在此基础上比较了各种算法的优劣,最后在TMS320F2812上予以实现,为工程实践提供了的依据.     

Elasto-plastic analysis of crack in metallic foams

To determine the solutions of the well-known problem of a finite width strip with single edge crack,some results on elasto-plastic fracture analysis for metallic foams are reported.Meanwhile,in order to discuss and put an insight into the nonlinear fracture analysis,the Dugdale model for plastic deformation of this configuration for metallic foams is recommended and solved.Combining the asymptotic solution with the Dugdale model and elastic solution,the stress field in the plastic zone and the size of the plastic zone are expressed as analytical forms.Based on Williams expansion method,the estimate of the scale factor is also completed and analyzed.In view of these analytical solutions,the results show the scale factor is a useful parameter for the fracture theory of metallic foams.     

Experimental study of the mechanical property of barrel processed by cold radial forging

The cold radial forging process usually introduces some changes of the material, such as the increased strength, the decreased plasticity and the introduction of anisotropic mechanical property. To obtain the changes of mechanical property of barrel processed by cold radial forging, the tangential mechanical properties of the barrel blank and the forged barrel are measured with a designed test based on the plastic deformation analysis for a barrel and by applying internal pressure, and their axial mechanical properties are measured by the tensile test. The changes of mechanical property of barrel processed by cold radial forging are obtained by comparing the mechanical properties of the barrel blank and the forged barrel. The tangential and axial flow stresses of the barrel blank and the forged barrel are also presented.     

科研合作网络的社团结构和中心节点研究

对发表于《ISI-SCIE（Science Citation Index Expanded）》上的PHARMACOLOGY＆PHARMACY学科的论文作者合作研究形成的一个复杂网络进行了研究。分析表明该合作网络共有40个子网络,其最大连通子网络节点的度服从幂律分布且有厚尾趋势,具有较小的平均路径长度,较大的聚类系数,存在少数关键节点,具有典型的小世界性和无标度性。并通过GN算法分析和挖掘了该最大连通子网络的社团结构,用度值、介数值和PAGERANK值等指标评价了网络的中心节点,揭示了合作网络中合作水平较高的科研团队和具有影响力的科学家。     

Numerical simulation of transport phenomena in continuous casting of steel plates with electromagnetic brake

The present work numerically investigates two-dimensional (2-D) solidification transport phenomena (EM-STP) during continuous casting (CC) process in the absence and the presence of static magnetic fields (SMFs), based on a unified numerical model. For the purpose of controlling vortexes, the electromagnetic brake (EMBR) effects of various SMFs under the given depth of submerged entry nozzle (SEN) and the same casting velocity V0 are investigated. ANSYS software is used to analyze the SMFs that applied to the EMCC process, and then a data-conversion program based on the principle of linear interpolation proposed previously is used to deal with the issue of data-format-matching between FEM and FVM. The simulation results indicate that, an appropriate SMF can effectively suppress the bulk liquid flow in CC-process of steel plate, and with increase of the intensity of applied magnetic fields, the vortexes become weaker and the oscillating amplitude of impinging jet decreases. Based on the knowledge gained from the EMCC-STP analysis and by comparing the results with the applied magnetic fields with those without magnetic fields, it is found that a SMF with |Bmax|=55×10-3 T can meet the need of braking, and consequently improve the quality of casting by reducing the penetration of non-metallic inclusions, as well as avoiding breakout, macro-segregation and crack ultimately.     

无线遥控循迹机器人的设计与实现

本文介绍了整个测量系统的组成和原理,并进行了系统硬件和软件设计,包括单片机最小系统、L298N电机驱动电路、RS232串口电路、循迹电路等的设计;软件设计包括数据处理部分、遥控部分和循迹部分等的设计。在AT89S52单片机中,以RS232串口和XL02～232API无线模块作为传输通道,实现了通过电脑遥控控制机器人运行以及自动寻迹的功能,具有实时性好,工作效率高等优点。     

手机机械结构与SAR优化

国际上通行的方法是用比吸收率(SAR)来衡量手机辐射大小。通过对不同结构的手机、不同形式的PCB板设计、不同位置、类型的天线等因素的分析比对,找出可以最小化SAR的方法,为未来手机设计提供参考。     

斜坡倾角对山体导流塔太阳能热气流电站系统性能的影响

提出了一种在中高纬地区利用阳面山体坡地建造的山体导流塔太阳能热气流电站,该太阳能热气流电站的集热棚搭建在一定坡度的山体上,兼做导流塔,在山体顶部建造一定高度的垂直导流塔,并利用理论推导的方法研究了影响电站系统效率的主要因素。结果表明:斜坡倾角对山体导流塔太阳能热气流电站系统效率有较大的影响,在中高纬地区当斜坡倾角比纬度小7°～10°时,集热棚单位面积斜面上截获的年辐射量比水平集热棚高25%。另外由于山体导流塔太阳能热气流电站的集热棚同时可兼作部分导流作用,因此该系统可适当减小垂直导流塔的高度,减少工程施工难度。