Original title: How to deal with the verticality deviation of bored pile with rotary excavator? [Abstract] Various rotary drilling rigs are widely used in the field of pile foundation construction at home and abroad, but in the process of construction of bored piles by rotary drilling rigs, the verticality deviation of pile body is often large, which can not meet the design requirements....
Original Title: New Progress in Key Technologies for Underground Metal Mining Underground metal mine mining is a systematic project, including development, development and mining (as shown in Figure 1, underground mine mining model), each link requires blasting. Therefore, how to blast safely and efficiently is a subject for every miner to study. Fig. 2 Underground mining mode At present, metal...
Original title: Operation steps of drilling and summary of methods to improve drilling accuracy! I. Basic concept of drilling Drilling refers to the machining process in which a hole is made in a solid material with a drill bit. In general, when drilling a material on a drill press, the drill bit should perform two movements simultaneously: ① Main motion, that is, the rotary motion of the drill...
Original title: Running 10: Zhou Shen challenges the Olympic champion, contracts the whole period to watch, and the hot search topic breaks tens of millions of seconds! The tenth program of "Running Bar 10" was still filmed in Changji, Xinjiang. At the beginning of the program, the whole staff appeared in Changji Stadium. The powerful singers in the music world, Zhou Shen and Bai Lu appeared in...
Original Title: Carboxymethyl Chitosan, a film-forming, moisturizing and anti-pollution active ingredient CARBOXYMETHYL CHITOSAN is a polysaccharide derived from marine organisms. Its molecular structure is as follows: Beta-1-4-straight chain glucose derivatives Disordered geometric arrangement of diglucose molecular Effective hydrophilic groups: carboxyl, acetamido Effective anti-corrosion...
Original Title: Difference between Short-path Distillation and Molecular Distillation-Shanghai DEA Short-path distillation, "short path" refers to a shorter distance, in a broad sense, the evaporator adopts the design scheme that the distance from the evaporation surface to the condensation surface is less than 300 MM, which can be called a short-path distiller. In terms of design structure, it...
Original Title: Nucleic Acid Extraction Grinder Easily Realizes Fine Grinding of Tissue Samples Nucleic acid extraction grinder is a powerful laboratory instrument and equipment, which is a common tool for laboratory sample preparation. Not only can be used for nucleic acid extraction and biological tissue cracking, but also can be used for RNA grinding extraction, protein grinding extraction,...
Original title: This provincial capital city tries out "centralized cooling", and the room temperature is around 26 ℃! Net Friend: Do you want to pay the cooling fee? In the winter of ice and snow, central heating makes people feel "warm as spring". In the hot summer, if centralized cooling can be achieved like central heating, the "happiness index" of the dog days may be greatly improved....
