Example embodiments relate to providing pixel-based visualizations of time series data using nested helices. Various embodiments of the present disclosure provide a heatmap representation that indicates the interestingness of content at different locations within the media. The drive carrier forms a precise fit within a computer chassis. An output gear is rotatably received in the gear receiving space of the case and driven by the speed reduction mechanism. Further, the present invention relates to a method for preparing the adsorbent including a hierarchically porous silica monolith, and particularly, to a method for preparing an adsorbent for adsorbing or separating carbon dioxide in air or heavy metals in an aqueous solution, in which an amino group is covalently bonded to the silica monolith.