Results 51 to 60 of about 357,157 (220)
American Journal of Botany, EarlyView.Abstract Premise Disentangling the ancestry of insular plant lineages is important for resolving their evolutionary histories but often complicated by polyploidy, an overrepresented condition in remote island floras. We used a phylogenomic approach to study the origin of subgenomes of the tetraploid Hawaiian silversword alliance and advance ...
Bruce G. Baldwin +4 more
wiley +1 more source
Experimental Study on Wear Characteristics of PCBN Tool with Variable Chamfered Edge
Chinese Journal of Mechanical Engineering, 2019 Owing to heavy dynamic and thermal loads, PCBN tools are seriously worn during hard cutting, which largely constrains the improvement of their machining performance.
Tao Chen +3 more
doaj +1 more source
The effect of the rate flank wear teeth face mills on the processing
, 2013 In this paper, the model of experimental tooth wear face mills on the back surface of the processing time. Using regression analysis model, the flank of wear on the processing time takes into account the feed, depth and cutting speed for face milling ...
Pimenov D.Y.
core +1 more source
The Anatomical Record, EarlyView.Abstract The Late Triassic–Early Jurassic fissures of the Bristol Channel area (southwest England and south Wales) are renowned for their diverse vertebrate faunas. These assemblages have yielded an array of predominantly small‐bodied forms that are crucial to our understanding of the early evolution of several major tetrapod clades.
Ewan H. Bodenham +4 more
wiley +1 more source
Analysis on oxidation and diffusion wear of PCBN tool in cutting nickel base alloy
Jin'gangshi yu moliao moju gongcheng, 2020 The wear mechanism of PCBN tool when cutting nickel-based alloy was studied by cutting experiments.The difference of the reaction mechanism of oxidative wear on the rake face and flank face of the tool was analyzed by the Gibbs free energy function ...
HU Xiaolong, SHAO Fang, WANG Renwei
doaj
The Anatomical Record, EarlyView.Abstract The middle Permian represents a critical interval in therapsid evolution, when gorgonopsians emerged as some of the first specialized apex predators within terrestrial ecosystems. Despite their significance, the early diversification of Gorgonopsia in Gondwana remains poorly understood due to scarcity and fragmentary material.
Zanildo Macungo +5 more
wiley +1 more source
ESTIMATION OF SURFACE ROUGHNESS AND FLANK WEAR IN MILLING OF INCONEL 625 SUPERALLOY
Surface Review and Letters, 2021 The main objective of this work is to experimentally investigate and statistically evaluate the effects of the milling parameters on surface roughness (Ra) and flank wear (Vb) in the milling of Inconel 625. Thus, milling experiments on different cutting conditions with Physical vapor deposition (PVD) and Chemical vapor deposition (CVD) coated inserts ...
Akgun, Mahir, Demir, Halil
openaire +3 more sources
The Anatomical Record, EarlyView.Abstract Extant turtles occupy freshwater, marine, and terrestrial habitats, and their nasal region provides important evidence for the evolution of respiration‐ and sensory‐related cranial morphology. However, developmental data on the turtle nasal capsule remain limited, particularly in Pleurodira.
Kai Ito +5 more
wiley +1 more source
Cutting Performance and Wear/Damage Characteristics of PCBN Tool in Hard Milling
Applied Sciences, 2019 In the intermittent machining of hardened steel for the die and mold industry, determining how to reduce the wear of PCBN (Polycrystalline Cubic Boron Nitride) tools and improve their machining efficiency and quality is an important subject.
Haining Gao, Xianli Liu, Zhitao Chen
doaj +1 more source
A Tool Wear Observer Model for Flank Wear Monitoring in the Milling of Nickel-based Alloys [PDF]
, 2009 Tool wear monitoring is of great industrial importance in machining Nickel-based alloys. This paper presents the research effort to develop a tool wear observer model for flank wear monitoring in the milling of Nickel-based alloys.
Chen XQ +5 more
core +1 more source