国际版输入“spdr xbi”给出的第一个词条便是它的官网,它家官网长酱紫。 右边Quick Links下有个Fact Sheet链接,是XBI的简单介绍PDF档,那就把它下载下来吧。打开PDF档,可以看到当前这个PDF档的时效是2020年12/31日,然后截了下面这张图,这里边高亮了3个关键信息点。 “S&P Biotechnology Select Industry Index”...
Otherwise if an image shows DF variation in contrast, the particle is likely to have strains, owing to the fact that the strain has effects on the diffraction behaviors of the electrons, resulting in dramatic contrast change. The high resolution TEM images of BiOX crystals also showed the ...
Although it is close to a bilayer that can be found inside the bulk material, the real surface of III-V compound (which can be thought as a half-way to an isolated 2D sheet) demonstrates a 2 × 2 reconstruction with either one of the four group-III atoms missing (III-...
This situation could be attributed to the fact that a part of the light is scattered instead of being specularly reflected. Such a scattering is presumably due to the inhomogeneities of the film surfaces observed under optical microscope and bulk inhomogeneities revealed by the TDBS technique (...