| 词汇 | compaction |
| 释义 | compaction noun[ U ] geology specializeduk /kəmˈpæk.ʃən/ us /kəmˈpæk.ʃən/ the process by which the pressure on buried solid material causes the material to stick together and change to rock压实 Geology - general words aeolian Anthropocene anticline apophysis auriferous biozone carboniferous continental plate geomorphic gully erosion henge Holocene hoodoo petrographic petrographically petrography petrological petrologically Precambrian rockfall compaction | American Dictionarycompaction noun[ U ] us/kəmˈpæk·ʃən/ earth science the process by which the pressure on buried solid material causes the material to stick together and change to rock Examples of compactioncompaction The increased size and use of machinery introduced soil problems, such as compaction, and required greater management skill. Explosives are now used in such diverse fields as welding, bulk cladding of plates, forming, sizing, powder compaction, hardening, and cutting. The system is expensive of time and energy but produces fine soil aggregates to planting depth with serious risks of compaction deeper in the profile. With continuing subduction the pelagic sediments might have been dragged beneath the accretionary prism leading to compaction and expulsion of large amounts of pore fluids. Many structural events are associated with compaction, including blastomere polarisation, blastomere flattening and gap junction formation. This is really not surprising, given that the compaction method pays no attention to the probabilities that play a crucial role in evaluation. However, minimum or zero tillage would not be suitable for soils that are susceptible to compaction, and for highly degraded soils. Here we examine the expression profile of uvomorulin at the cellular level, in oocytes and embryos up to and during compaction. To reduce compaction of moist soil and obviate the need for harrowing to level the fields, controlled traffic is being introduced in rice-wheat systems. Thus, good agricultural practice of subsoiling to alleviate compaction before planting is probably the key to mitigating the adverse effects on yield. Compaction of the sediment would also result in a reduction of the photic zone. Only some small folding at the contact occurs, probably due to differential compaction. Possible mechanisms underlying the rearrangements which take place both at fertilisation and during compaction and experimental decompaction are discussed. The possibility therefore exists that the uvomorulinmediated interaction between cells might involve protein phosphorylations and that these are central to the events of compaction. Many growers respond to problems of compaction by top-dressing nitrogen and increasing the amount of irrigation applied. These examples are from corpora and from sources on the web. Any opinions in the examples do not represent the opinion of the Cambridge Dictionary editors or of Cambridge University Press or its licensors. |
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