Molecular dynamics simulations using tight-binding many body potential are carried out to study the roller imprint process of a gold single crystal. The effect of the roller tooth's taper angle, imprint depth, imprint temperature, and imprint direction on the imprint force, adhesion, stress distribution, and strain are investigated. A two-stage roller imprint process was obtained from an imprin...

Vertical roller mills (VRMs) are well-established grinding equipment for various tasks in the coal and cement industry. There are few studies on simulation of VRMs. In this research work, application of perfect mixing model for simulation of a VRM in a cement grinding plant was investigated. Two sampling surveys were carried out on the VRM circuit. The samples and data from the first survey wer...

To meet the requirement of lightweight, an increasing number solid shafts are designed to be hollow in transportation industry. In this study, a novel method flat-knifing cross-wedge rolling (FCWR) with single guide is proposed including modified roller, horizontal mill, and single-guide structure, its key problems studied by numerical simulations experimental tests. A mathematical model FCWR r...

FOR some years we have been engaged on the problem of extracting enzymes from micro-organisms. It is well known that most bacteria and yeasts carry out oxidations and metabolic processes at a rate incomparably higher than that of animal tissues. The peculiar virtue of micro-organisms as the source of enzymes is therefore self-evident. A certain amount of success has been attained in extracting ...

In the whole process of cement production, electricity consumption a raw material mill accounts for about 24% total. Based on statistics system 1005 production lines in China between 2014 and 2019, it is found that average preparation all clinker 2019 was 25.2 kWh/t. The different-tonnage varies with time. comparison high-tonnage ones, low-tonnage has wider distribution. dropped from 30.88 kWh/...

Roller skis are used by cross-country skiers, biathletes and ski-orienteers for their snow-free training and in roller ski competitions. Additionally, much of the current sports research into the physiology and biomechanics of crosscountry skiing is conducted indoors on treadmills using roller skis. For elite athletes, the differences in performance are quite small, thus emphasising the importa...