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Drilling and blasting
Introduction
Drilling and blasting is a method of excavation used in constructing tunnels and underground structures. This process has been used since ancient times, but it has evolved over the years and is regularly used in modern engineering projects. In this article, we will discuss the drilli......
1050 
Hailey
"Kao Gong Ji"
Examination for Civil Service
The Examination for Civil Service (called as the Ke Gong Ji in Chinese) is a system of competitive attention and essential academic knowledge to government bureaucracy. Imperial officials in China are usually selected through a range of examinations and tests that ha......
151 ball mill operating procedures
1. Introduction
A ball mill is a type of grinder used to grind and blend materials for use in mineral dressing processes, paints, pyrotechnics, ceramics and selective laser sintering. It works on the principle of impact and attrition: size reduction is done by impact as the balls drop from near t......
GB 4946-85 Gas Chromatography Terminology
Gas chromatography is an analytical method utilized in many fields of science. It is an extremely useful tool for the separation, identification, and quantification of volatile and semi-volatile compounds. In order to facilitate communication between practitioners in the field, an international ga......
GB/T3781.7-93 Determination of iodine absorption value of acetylene carbon black
Determination of Iodine Adsorption Value of Acetylene Carbon Black
Acetylene carbon black is a special type of carbon black manufactured by the burning of acetylene gas in abnormally oxygen-deficient atmosphere. Carbon black can be used as a reinforcing filler for rubber, plastics and other produ......
HJ/T 57-2000 Determination of Sulfur Dioxide in Exhaust from Stationary Pollution Sources Constant Potential Electrolysis
Fixed source pollution emission sulfur dioxide ( SO2) Detrmination - Potentiometric Electrolysis Method
Abstract
This paper discusses the detection and measurement of sulfur dioxide ( SO2) emission from stationary sources of pollution, using a potentiometric electrolysis ( the P.E. ) method. The......
Principle of spot welding process (on)
Point Soldering Technology Principle (I)
Point soldering is a kind of soldering technology widely used in electronic industry. Its essence is to make the soldering material melt, fill the contact surface between electronic components and printed circuit boards, and bind them together. The method ......
Types of surface heat treatment processes
Types of Surface Heat Treatment Process
Surface heat treatment, or surface engineering, is a process used to make changes to the properties of a material without altering its bulk properties by altering its surface properties. This process is commonly used to improve wear resistance, increase hard......
Plastic Plating
Plastic electroplating is a process in which an electrically conductive material is bonded to a less conductive substrate material by using an electrolytic process. The process is used to provide improved conductive properties and mechanical properties to the substrate material. It is also used to......
Surface Microstructure and Hardness of Several Steels After Gas Soft Nitriding
Steel grade hardness and surface organization after nitriding
Nitriding has become one of the most well known and commonly used techniques for improving the performance of steel components used in industrial settings. Through the injection of nitrogen atoms into the surface layers of a steel produ......
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