Fe-Cu-Nb-Si-B薄带的淬态纳米化与巨磁阻抗效应

使用较低的快淬速度(V =2 2m·s- 1 ) ,可以使Fe Cu Nb Si B薄带实现淬态纳米晶化。Fe Cu Nb Si B薄带析出αFe(Si)纳米相,其晶粒尺寸在淬态薄带Fe73Cu1 .5Nb3Si1 3.5B9中约为15nm ,在Fe71 .5Cu3Nb3Si1 3.5B9中约为10nm。添加Cu元素可以细化淬态薄带的晶粒。实验发现磁阻抗ΔZ/Z0 ,磁电阻ΔR/R0 ,磁电抗ΔX/X0 三条曲线交叉于一点,通过推导发现此现象具有必然性。淬态薄带Fe74 .5-xCuxNb3Si1 3.5B9的磁阻抗显示了较强的Cu含量依赖性。在快淬速度v =2 2m·s- 1 下,在x =1.5和x =3左右观察到磁阻抗峰值现象。     

缓冲层Ta对退火Co/Cu/Co薄膜微观结构和界面互扩散的影响

用直流磁控溅射法在Si/SiO₂基底上制备了Co/Cu/Co薄膜和加入缓冲层的Ta/Co/Cu/Co薄膜,用扫描电子显微镜、原子力显微镜、X射线衍射和俄歇电子能谱研究了薄膜的微观结构、表面形貌、织构和界面互扩散现象。结果表明:退火后薄膜中均存在{111}和{002}衍射峰,加入缓冲层Ta后,Co/Cu/Co薄膜的衍射峰强度明显增强,并存在较强的{111}纤维织构,薄膜表面孔洞及粗糙度大幅减小。退火后薄膜界面处产生互扩散现象,层状结构被破坏。缓冲层Ta提高了薄膜与基底材料间的润湿性,可有效缓解界面互扩散现象。     

Cu层宽度对弯曲型三明治结构FeCuNbCrSiB/Cu/FeCuNbCrSiB多层膜巨磁阻抗效应的影响

采用射频磁控溅射方法和微细加工工艺制备了不同Cu层宽度的弯曲型三明治结构的FeCuNbCrSiB/Cu/FeCuNbCrSiB多层膜,在频率1～40MHz下研究了Cu层宽度对多层膜的纵向和横向巨磁阻抗效应的影响.结果表明,弯曲型三明治结构多层膜的巨磁阻抗率随Cu层宽度的变化具有显著的变化,在频率10MHz、磁场12kA/m下,当Cu层宽度为0.4mm时,纵向、横向巨磁阻抗率分别达-57%、-65%.     

Optimized Fibril Network Morphology by Precise Side‐Chain Engineering to Achieve High‐Performance Bulk‐Heterojunction Organic Solar Cells

A polymer fibril assembly can dictate the morphology framework, in forming a network structure, which is highly advantageous in bulk heterojunction (BHJ) organic solar cells (OSCs). A fundamental understanding of how to manipulate such a fibril assembly and its influence on the BHJ morphology and device performance is crucially important. Here, a series of donor–acceptor polymers, PBT1‐O, PBT1‐S, and PBT1‐C, is used to systematically investigate the relationship between molecular structure, morphology, and photovoltaic performance. The subtle atom change in side chains is found to have profound effect on regulating electronic structure and self‐assembly of conjugated polymers. Compared with PBT1‐O and PBT1‐S, PBT1‐C‐based OSCs show much higher photovoltaic performance with a record fill factor (FF) of 80.5%, due to the formation of optimal interpenetrating network morphology. Such a fibril network strategy is further extended to nonfullerene OSCs using a small‐molecular acceptor, which shows a high efficiency of 12.7% and an FF of 78.5%. The results indicate the formation of well‐defined fibrillar structure is a promising approach to achieving a favorable morphology in BHJ OSCs.     

超磁致伸缩致动器控制系统的建模与仿真

结合磁致伸缩致动器的结构建立了致动器传递函数模型，对磁致伸缩致动器控制系统进行了仿真，设计了PID调节器，并在此基础上进行了离散化，得到了数字控制系统，为磁致伸缩致动器控制系统的硬件选型和硬软件设计提供前提条件。     

巨磁电阻材料及其在电子元器件上的应用

介绍了一种新型的磁性功能材料——巨磁电阻薄膜材料,并就它在巨磁电阻传感器、高密度磁记录读磁头以及巨磁电阻随机存储器等电子元器件上的应用作了一些论述。     

几种复鞣剂在正软鞋面革复鞣中对原纤维的作用

用 Re 1 uganRE、DLT-15、DLT-14、铬鞣液和 RE—进口荆树皮栲胶—DLT-14、GTW—DLT-14—DLT-15、RE—DLT-15组合复鞣剂对铬鞣软鞋面革进行复鞣。复鞣革经分散和超薄切片制样,在透射电镜上观察其原纤维。结果表明,RE和 DLT-14复鞣剂有明显的填充作用,这种填充作用限于皮革原纤维以上的结构层次,并对这些结构有包裹作用。在皮革厚度方向上,外层填充强于内层填充。DLT-15复鞣剂的填充和包裹原纤维的作用比 RE 和 DLT-14小,而铬鞣液则没有这些作用。     

Nanodielectrics with giant permittivity

Nanodielectrics is an emerging area of research because of its potential application in energy storage and transducers. One-dimensional metallic nanostructures with localized electronic wave functions show giant dielectric constant. Following the prediction, during the last couple of years we have investigated the effect of giant permittivity in one-dimensional systems of conventional metals and conjugated polymer chains. In this article, we have tried to summarize the works on giant permittivity and finally the fabrication of nanocapacitor using metal nanowires, which shows giant permittivity is also discussed.     

Quantification of the graphical details of collagen fibrils in transmission electron micrographs

A novel 2D image analysis technique is demonstrated. Using the digitized images of articular cartilage from transmission electron microscopy (TEM), this technique performs a localized 'vector' analysis at each region that is large enough to include several or tens of collagen fibrils but small enough to provide a fine resolution for the whole tissue. For each small and localized region, the morphology of the collagen fibrils can be characterized by three quantities essential to the nature of the tissue: the concentration of the fibrils, the overall orientation of the fibrils, and the anisotropy of the fibrils. This technique is capable of providing new insight to the existing technology by assigning quantitative attributes to the qualitative graphics. The assigned quantities are sensitive to the fine structure of the collagen matrix and meaningful in the architectural nature of the collagen matrix. These quantities could provide a critical linkage between the ultrastructure of the tissue and the macroscopic behaviours of the material. In addition, coarse-graining the microscopic resolution of EM without compromising the essential features of the tissue's structure provides a direct view of the tissue's morphology and permits direct correlations and comparisons among interdisciplinary techniques.     

石油化工厂大型塔器的可施工性设计

以某石油化工总厂PX装置二甲苯塔为例 ,从质量、费用、进度和安全控制全过程的角度 ,阐述了对大型塔器的设计、制造和安装一体化的要求 ,即可施工性设计的必要性 ,并对如何在工程建设全过程中做好可施工性设计提出了建议。