other knowledge
black swan event
The Black Swan Incident
On a stormy night in 2001, an astonishing group of birds was spotted in the backwaters of western New York. Against the black sky and driving rain, a flock of large black swans suddenly filled the air with their majestic wingspans and powerful honking.
For local wildlife ......
23/06/2023 
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Hannah
Grounding device construction and acceptance specification GB50169-92
Construction and Acceptance Specification for Grounding Devices
GB 50169-92
Introduction
This specification, in compliance with GB 50169-92, is set up with reference to the Code for Lightning Protection of Buildings (GBJ 135-2006). The specification has been devised by the Ministry of Construct......
printing alloy
Introduction
Printed alloy is a type of alloy of materials with compounds created through a special 3D printing process. This mixture has a number of advantages and is now widely used in a variety of industries.
Advantages of Printed Alloys
Printed alloys are lighter and more cost-effective tha......
Gmelin Handbook of Inorganic Chemistry
Grignard reagents are important tools used in organic and inorganic chemistry, and they are named as such due to their ability to form highly reactive Grignard reagent intermediates. In organic chemistry, Grignard reagents are commonly used for the reaction of unreactive ketones and aldehydes, the......
San Francisco
St. Francis of Assisi
St. Francis of Assisi is one of the most beloved figures in Catholic history. He was born in Assisi, Italy in 1182 and was the son of a wealthy cloth merchant. Though Francis had a relatively comfortable upbringing, he was drawn to a life of poverty and devoted himself to he......
Future Development Direction of Microalloyed Steel in my country
The Develop Direction of Microalloyed Steels in China
China has a long industrial history, and its steel industry is one of the oldest in the world. As the world’s biggest steel producer and consumer, China’s steel industry is growing rapidly even in the face of the current global crisis. In pa......
How to judge the heating temperature of steel with the naked eye?
One way to determine the heating temperature of steel with the naked eye is to observe the changes in color on the surface of the steel as it is heated. The temperature of steel can be estimated based on the color that it takes on as it is heated.
When steel is heated, it gradually changes color ......
Five production methods of ferroalloy
Introduction
Ferrous alloys constitute a large and diverse class of materials that include iron and some or all of its primary alloying elements. This article discusses the five production methods of ferrous alloys, namely, cast iron, ferroalloy, alloy steel, stainless steels and tool steels.
Ca......
medium rolling mill
Open Type Steel Rolling Mill
Open type steel rolling mill is a type of industrial facility used to shape already-refined steel into finished products. Large-scale rolling mills are used in the production of steel structures, pipes and components, as well as manufacturer props for automotive, aero......
rock tunneling
Tunnel Excavation
Tunnel excavation is an important part of the construction process for many types of projects. Tunnels can provide access to other parts of the world, or simply be used to provide underground infrastructure such as sewers, water lines, and electrical lines. The excavation of a t......
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