制作家庭视听室时怎样克服浴室效应

提起浴室,便会在脑海里浮现出一个墙壁、地面贴满瓷砖的房间,每件用具都是又光又滑的釉面;在这儿只要一击掌,就可以听见声音带着明显的拖尾。这种现象,物理学上叫做混响。混响时间太长的房间由于存在上述的浴室效应,不适合视听欣赏,需要进行适当的声学治理。人们在空荡的新房子里,讲起话来总有一点浴室效应。而当搬进大床、沙发,铺好地毯、挂上窗帘以后,浴室效应就不那么显著了。这说明像、地毯、沙发、窗帘     

柴达木盆地北缘的右行走滑冲断系统及其动力学

通过对于断裂系统分析和地球物理资料的解释,证实了柴达木盆地北缘西段的主要构造形成时间为上新世以后,变形样式为一系列右行走滑冲断构造。走滑冲断构造带内部的断层在平面上呈分支复合,剖面上表现为正花状构造,断层上、下盘地层层序无法直接对比。右行走滑冲断构造形成于南祁连由北向南的斜向推覆作用,而主要应力来源于柴达木地块北缘由南向北的陆内俯冲作用。用一个运动学模型解释了柴北缘的右行走滑冲断作用机制。     

乳腺癌中着丝粒蛋白CenpG的差异表达

用间接免疫荧光（IIF）验证了着丝粒蛋白CenpG的一种抗血清；通过对31例乳腺癌组织块及每一例病人的癌旁正常（非癌性）组织块蛋白提取物进行免疫印迹（Western blot）分析，发现多数情况下（71%）癌组织中着丝粒蛋白CenpG(95kD)过表达；在两例乳腺癌组织中还发现了一种能被CenpG抗血清识别的43kD蛋白质成分。结果表明，新近发现和命名的CenpG（或者还有其他相关成分）的差异表达可能与细胞恶性增殖有关。     

酸溶性钛渣酸解工艺研究

针对攀枝花钛铁矿冶炼钛渣的物化性质，对影响钛渣酸解率和钛液指标的各个因素进行了全面系统的实验室研究，并在年产2000t钛白生产线上进行了工业验证和优化试验，酸解率稳定在93％以上，三价钛控制在1－3g/L，钛液浓度较钛矿酸解提高了40－50g/L，其它钛液指标达到了后续水解工艺的要求。     

An analysis method for correlation between catenary irregularities and pantograph-catenary contact force

Pantograph-catenary contact force provides the main basis for evaluation of current quality collection; however, the pantograph-catenary contact force is largely affected by the catenary irregularities. To analyze the correlated relationship between catenary irregularities and pantograph-catenary contact force, a method based on nonlinear auto-regressive with exogenous input （NARX） neural networks was developed. First, to collect the test data of catenary irregularities and contact force, the pantograph/catenary dynamics model was established and dynamic simulation was conducted using MATLAB/Simulink. Second, catenary irregularities were used as the input to NARX neural network and the contact force was determined as output of the NARX neural network, in which the neural network was trained by an improved training mechanism based on the regularization algorithm. The simulation results show that the testing error and correlation coefficient are 0.1100 and 0.8029, respectively, and the prediction accuracy is satisfactory. And the comparisons with other algorithms indicate the validity and superiority of the proposed approach.     

Microstructure characterization of reinforcements in in-situ synthesized composites of Al-Zr-O system

A novel in-situ reaction system Al-Zr-O was developed. In-situ Al3Zr and Al2O3 particulates reinforced aluminum matrix composites were fabricated by the direct melt reaction technique in the Al-Zr-O system. Microstructures of the composites and crystal morphology of in-situ formed Al3Zr and Al2O3 particulates were analyzed by scanning electron microscope (SEM) and transmission electron microscope (TEM). Results indicate that in-situ formed Al3 Zr and Al2O3 particles are finer and well distributed in aluminum matrix. Al3Zr particulates with a tetragonal structure are mainly in the shape of polyhedron. A few of them are in the form of rectangle. The length/width ratio of the rectangular Al3Zr is less than 2.0 and the maximum size is 2μm. In addition, a certain number of Al2O3 submicro particles with a hexagonal structure are also generated in this system. Furthermore, it is found that Al3Zr crystal grows by the mechanism of twinning. The twin plane is (114). The twinning direction is [221]. The tensile tests show that the composites synthesized in the Al-Zr-O system exhibits high strength and ductility. There are a lot of ripples with fine particles on the fracture. The principal strengthening mechanisms for (Al3Zr Al2O3 )p/Al composites may include Orowan strengthening, grain-refining strengthening, solid-solution strengthening and dislocation strengthening.     

昆仑山口西8.1级大地震震后库赛湖地区多时相InSAR地表形变遥感探测

利用2003年~2007年间14景欧空局ENVISAT ASAR卫星数据,结合SRTM DEM数据,采用多时相SAR协同配准方法进行二路干涉处理,对2001年11月昆仑山口西8.1级大地震宏观震中—库赛湖地区的地表形变场进行了多时相探测。结果表明:①多时相InSAR技术能够对位于高海拔山区的东昆仑断裂带库赛湖段的地表形变实施连续监测;②震后发震断裂带的调整活动经历了一个动态变化的过程,2003年~2004年、2005年9月至2006年2月相对活跃,调整幅度较大,2004年11月至2005年9月间调整较小;③2006年~2007年发震断裂带地区活动逐渐减弱。     

中厚板头部弯曲的正交实验及分析

模拟现场生产条件,采用正交实验法对中厚板轧制过程中板头弯曲问题进行了研究.分析了轧制过程中影响钢板头部弯曲的因素,得到各影响因素按其重要性由大到小的排序为:变形区形状参数、轧机上下辊转速比、上下辊辊径比、导入角、来料厚度、摩擦状况,并得到了各影响因素的最佳水平.实验还表明:采用正交实验法显著加快了实验进程,减少了实验周期和实验成本,较快地达到了实验目的.     

中厚板裂纹影响因素的定量分析及改善途径探讨

裂纹是中厚板生产过程中最常见的缺陷、其影响因素错综复杂、交互作用、且难以准确定量描叙。通过定义裂纹指数和现场生产试验，运用数理统计方法，寻求中厚板裂纹与影响因素之间的定量关系，并在深入分析的基础上，探讨改善冶金工艺、优化再加热和轧制规范，减缓裂纹不良影响的途径。     

邯钢30MnSi高强度热轧盘条的开发

30MnSi热轧盘条经拉拔强化和调质热处理后使用,主要应用于制作港口混凝土管桩、高层建筑地基混凝土管桩等.从生产开发的角度,对预应力钢棒用热轧盘条30MnSi的成分设计,炼钢和轧钢重点工艺控制进行了较为详细的阐述.