Abstract: The invention provides a method for increasing wear resistance of a surface of a crankshaft, including: dividing a journal of a crankshaft into a journal coating portion and two journal grinding portions located on two sides of the journal coating portion; the surface of the journal grinding portion is higher than that of the journal coating portion, and higher than the surface of the journal of a finished crankshaft, the surface of the rounded corner of the crankshaft is higher than that of the rounded corner of the finished crankshaft, and the size of the journal coating portion is smaller than that of the journal of the finished crankshaft; and spraying a ceramic coating on the surface of the journal coating portion, grinding the surfaces of the journal and the rounded corner until the ceramic coating and the surface of the rounded corner are seamlessly joined, and performing polishing.

Abstract: The present disclosure provides a method for controlling an amount of silicon added to ductile cast iron, a method for casting ductile cast iron, and a cast product, which relate to the technical fields of metallurgical and cast iron alloys. The method for controlling an amount of silicon added to ductile cast iron includes smelting ductile cast iron using scrap steel as a raw material. After the scrap steel is melted into molten iron, a copper alloy is added so that the molten iron has a copper equivalent of 0.8% to 1.0%, wherein the copper equivalent is controlled by formula (II). Then, ferrosilicon is added so that the content of silicon added to the molten iron satisfies formula (I).

Abstract: The present disclosure provides a method for controlling an amount of silicon added to ductile cast iron, a method for casting ductile cast iron, and a cast product, which relate to the technical fields of metallurgical and cast iron alloys. The method for controlling an amount of silicon added to ductile cast iron includes smelting ductile cast iron using scrap steel as a raw material. After the scrap steel is melted into molten iron, a copper alloy is added so that the molten iron has a copper equivalent of 0.8% to 1.0%, wherein the copper equivalent is controlled by formula (II). Then, ferrosilicon is added so that the content of silicon added to the molten iron satisfies formula (I).

Abstract: The present invention relates to gene engineering filed, and provides a genome sequencing device, construction method of fragments assembling scaffold and system thereof. The method comprises the following steps: mapping the double-barreled data obtained through sequencing to contigs; calculating the mean length between contigs based on multiple pairs of double-barreled data mapped to contigs, which is taken as the gap size between contigs; constructing scaffold based on gap size between contigs and the double-barreled relation between contigs; and obtaining complete scaffold graph. Since the mean length between contigs is calculated from multiple pairs of double-barreled data and is taken as the gap size between contigs, the estimation precision of gap size between contigs is improved greatly. It can be used for genome sequencing including short sequencing read length to finish task of assembling sequencing fragments.