Experimental Investigation of Oil Film Variation in Finite Line Contact Under Intermittent Motion
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The variation of oil film distribution in the line contact area of pin and disk was experimentally observed during a periodic intermittent motion. The study was conducted on a ball-disk optical interferometric test rig, with motion speed controlled by PLC programming. PAO40 oil was primarily used in the experiment, with the glass disk undergoing periodic motion of constant speed-deceleration-stop-acceleration, while the pin roller remained fixed. The results indicate that when the motion stops, a portion of the oil is entrapped in the center of the contact area. As the acceleration phase begins, this portion of the oil is gradually squeezed out of the contact area, and the oil film with lowest thickness at the entrance of the contact area moves towards the exit of the contact area, passing through the contact center. It can also be observed that during the entire process, an increase in speed increases the film thickness, while an increase in deceleration time, i.e., a decrease in deceleration, reduces the film thickness during the stop phase.Keywords:
Variation (astronomy)
Line (geometry)
Firstly,according to variation contents,the paper divides variation into operating range variation,construction condition variation,design variation,construction variation and technique standards variation. Contraposing to different content variation,the paper puts forward dissimilar control methods. According to the property of project variation,the paper divides variation into fatal variation,important variation and general variation,and points out that we can control variation effectively by establishing dissimilar authority of project variation examination and approval. Finally,according to the urgency of variation,the paper divides variation into variation under urgent circumstance and variation under not urgent circumstance,and puts forward that we can control these variation by different procedure.
Variation (astronomy)
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AbstractThe names of 1024 American automobiles are analyzed according to register variation, diachronic variation and manufacturer variation. Variation through such linguistic means as structural complexity, metonymy and iconicity is shown to not only reflect social realities of automobile producers and consumers but to actively contribute to constructing these realities as well.
Variation (astronomy)
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Variation (astronomy)
Sociolinguistics
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Porous SiC Ceramics with Multiple Pore Structure Fabricated via Gelcasting and Solid State Sintering
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Cross-talks and sketches are two important forms of language art in our country. They are popular with a wide range of audiences around the country due to their humorous language. Language variation is a very important means of creating humor effect. In cross-talks and sketches,various forms of language variation, including phonetic variation, lexical variation,grammar variation, semantic variation,stylistic variation and pragmatic variation,are applied to realize humor effect.
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A simple microwave‐assisted aqueous solution strategy combined with a subsequent low‐temperature hydrogen reduction process was used to prepare Mo‐Cu nanopowders. In order to systematically investigate the densification behavior and properties of Mo‐Cu composites, the densification, microstructure, hardness, electrical conductivity, thermal conductivity, and bending strength of Mo‐Cu compacts were tested after sintering at different temperatures. Results show that the sintering temperature is a critical factor in the densification process of Mo‐Cu composites. The shrinkage rate, density, and hardness of sintered composites increase as the temperature rises. However, too high sintering temperature resulted in the decrease in electrical conductivity (EC), thermal conductivity (TC), and bending strength. By optimizing all the performance indicators, high‐performance Mo‐25 wt.% Cu composites with a homogeneous microstructure accompanied with good physical and mechanical properties could be successfully obtained by sintering for 2 h at 1200°C.
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