automatic coupler‚ electric coupler still now. - Properties required Knuckle coupler needs these properties. i. Physical - High Density ii. Chemical - High Corrosion resistance‚ High Oxidation resistance iii. Mechanical - High Strength‚ Hardness‚ Toughness iv. Economic – Low cost Locomotive vehicles on railway are connected together by a linked mechanism system of a coupling. The first time‚ we used a chain and a screw type coupler. They are not used in these days because problem
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Faults of woven fabric: Bar: It is a band running across the full width of cloth. Pick bar due ti difference in pick spacing Tension-bar due to difference in weft tension Weft-bar due to difference in material count‚ twist etc Box marks: The causes of box marks are – Dirty box Shuttle riding over the weft Dirty shuttle Dirty picking and ticks Broken pattern: It occurs due to wrong drawing of threads insertion of thee pick‚ incorrect lifting of warp threads. Broken pick:
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All minerals have four properties: 1. All minerals are naturally occurring 2. All minerals are inorganic (that means non-living) 3. A different chemical formula can be written for each mineral and that formula is constant for that mineral. ex. Galena is PbS- that is it has one lead atom (Pb) and one sulfur (S) atom in each molecule. 4. Most minerals have an unique crystalline shape given the right growing conditions (like in a cave). Compounds are substances that has two or
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Associate Level Material Mineral Identification Worksheet Open the simulation and print this worksheet and the Mineral Identification Job Aid. Then do the following: 1. Conduct all tests on the minerals in the virtual lab. Minerals in the virtual lab are numbered 1–7. Keep track of which mineral you are working with as you record your observations. 2. Record your observations of each test in Part 1 of this worksheet. Help: Refer to the job aids in the upper right corner of the test
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shielded metal arc welding process on bead geometry‚ microstructure and hardness of welding 1020 carbon steel plate. The results show that the highest hardness measurement was recorded when welding was performed using the DC- polarity. In all samples‚ the hardness values decreased along the distance were taken away from the weld metal toward the parent metal through the Heat Effected Zone (HAZ). The lowest hardness measurements were recorded when the welding was performed using the AC polarity
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meteorites. It was discovered in 1751‚ by Axel Fredrik in Sweden. It belongs to the transition metal group and is known for its hardness and ductility. Significant chemical reactivity is exhibited by pure Nickel. Nickel in its pure or low-alloy form is used in several fields as it is highly resistant to various reducing chemicals. Nickel when annealed exhibits low hardness with good ductility and malleability. 1.1.1. Nickel 200 1.1.1.1. Metallography Nickel 200 is a solid-solution alloy with a face-centered
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strength of rocks from indentation hardness index by S. Kahraman*‚ M. Fener†‚ and E. Kozman‡ Synopsis The prediction of rock properties from indirect testing methods is important‚ particularly for preliminary investigations since indirect tests are easier and cheaper than the direct tests. In this study‚ we investigate the predictability of the uniaxial compressive strength (UCS ) and Brazilian tensile strength (BTS ) of rocks from the indentation hardness index (IHI ) obtained using point load
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The HOMO-LUMO energy gap is an important parameter that characterizes the chemical activity of small clusters. It represents the ability of a cluster to participate in chemical reactions to some degree. In general‚ a large HOMO-LUMO energy gap indicates a weaker chemical reactivity. The calculated values of HOMO-LUMO gaps for Rhn clusters are given in Table 3. From this table‚ the HOMO-LUMO energy gaps are in the range of (0.018-0.297 eV)‚ indicating that the metallic behaviour can appear in these
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level of confidence / decrease uncertainty * Increase overall safety Destructive Testing Destructive testing (DT) includes methods where your material is broken down in order to determine mechanical properties‚ such as strength‚ toughness and hardness. In practice it means‚ for example‚ finding out if the quality of a weld is good enough to withstand extreme pressure or to verify the properties of a material. Destructive testing is most suitable‚ and economic‚ for objects which will be mass produced
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tungsten ore‚ chrome ore‚ etc.)‚ various types of stone (limestone‚ granite‚ gneiss‚ basalt‚ gray rock‚ etc.) and industry coal used in power. The hardness of the media is the main basis that determines the liner plate wear‚ the higher hardness of the media‚ the shorter service life of the liner‚ on the contrary‚ if the media is with a lower hardness‚ the service life of the liner will be prolonged. 2‚ The impact of operating conditions1) Eliminate defects not timely.2) Adjusting undeservedly makes
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