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In a sewing thread, the treads are doubled in two phases. Two or three strands are twisted together then three of these threads are twisted together, to form a six or nine cord. [9] The spun yarn is wound onto a bobbin using a doubling winding machine, and two or more of these bobbins are placed on doubling frame (doubling winding machine). The ...
Crochet (English: / k r oʊ ˈ ʃ eɪ /; [1] French: [2]) is a process of creating textiles by using a crochet hook to interlock loops of yarn, thread, or strands of other materials. [3] The name is derived from the French term crochet, which means 'hook'. [4]
While the classic use of the facial composite is the citizen recognizing the face as an acquaintance, there are other ways where a facial composite can prove useful. The facial composite can contribute in law enforcement in a number of ways: Identifying the suspect in a wanted poster. Additional evidence against a suspect. [citation needed]
Cluster analysis or clustering is the task of grouping a set of objects in such a way that objects in the same group (called a cluster) are more similar (in some specific sense defined by the analyst) to each other than to those in other groups (clusters).
The first step is to determine which elements to merge in a cluster. Usually, we want to take the two closest elements, according to the chosen distance. Optionally, one can also construct a distance matrix at this stage, where the number in the i -th row j -th column is the distance between the i -th and j -th elements.
With metals in group 4 or 5 a so-called edge-capped octahedral clusters are more common. Twelve halides are located along the edge of the octahedron and six are terminal. Examples of this structure type are tungsten(III) chloride, Ta 6 Cl 14 (H 2 O) 4, [5] [6] Nb 6 F 15, and Nb 6 F 18 2−. [1] Structure of edge-capped octahedral clusters such ...
The two allotropes that are encountered at normal pressure and temperature, α-tin and β-tin, are more commonly known as gray tin and white tin respectively. Two more allotropes, γ and σ, exist at temperatures above 161 °C and pressures above several GPa. [23] White tin is metallic, and is the stable crystalline form at or above room ...
Some common DC power connectors. A DC connector (or DC plug, for one common type) is an electrical connector that supplies direct current (DC) power. Compared to domestic AC power plugs and sockets, DC connectors have many more standard types that are not interchangeable. The dimensions and arrangement of DC connectors can be chosen to prevent ...