Results 61 to 70 of about 23,694,863 (285)

Redescription of the Triassic cynodont Cistecynodon parvus and reassessment of its phylogeny

The Anatomical Record, EarlyView.
Abstract Cynodontia is an important subclade of Therapsida that first occurred in the late Permian. It includes extinct subclades which are the non‐mammaliaform cynodonts and Mammaliaformes, with the latter ultimately giving rise to crown mammals. The systematics of non‐mammaliaform cynodonts has been extensively studied and is relatively well‐resolved,
Erin S. Lund, Frederik P. Wolvaardt, Roger M. H. Smith, Jaganmoy Jodder, Julien Benoit   +4 more
wiley   +1 more source

A note on Merwin's measurements of forward flow in rolling contact [PDF]

, 2004
The first quantitative analysis of the forward flow in frictionless rolling contact, firstly discovered experimentally by Crook [Proc. Inst. Mech. Eng.
Ciavarella, M., Ponter, A.R.S., Afferante, L.   +2 more
core   +1 more source

Evolutionary radiation of large‐bodied gorgonopsians from the lower Abrahamskraal formation of South Africa

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, Ricardo Araújo, Bruce S. Rubidge, Michael O. Day, Kathleen N. Dollman, Julien Benoit   +5 more
wiley   +1 more source

Analysis of the Tooth Surface Modeling and Honing Characteristic of Internal Gear Honing Stone based on Matlab

Jixie chuandong, 2016
Based on the processing principle analysis of internal gear honing,the space coordinates system of honing stone and workpiece are built and the contact line equation of workpiece and the tooth surface equation of honing stone are derived by the contact ...
Han Jiang, Zhao Feihu, Zhang Kuibang, Xia Lian   +3 more
doaj  

Mathematic design and computer analysis of curve-surface conjugated face gear pair

Advances in Mechanical Engineering
The mathematic model and computer analysis model of curve-surface conjugated face gear pair are developed on the basis of the principle of differential geometry.
Jun Wang, Jianpeng Dong, Sibao Wang, Yuliang Xiao   +3 more
doaj   +1 more source

Tooth Contact Analysis of Cylindrical Gears with an Unconventional Tooth Profile

Advances in Science and Technology Research Journal, 2022
Michał Batsch, Dawid Wydrzyński, Łukasz Przeszłowski   +2 more
openaire   +1 more source

Tooth-whitening activity of a novel home-bleaching system utilising thermal diffusion : a multifactorial simultaneous evaluation of efficacy at cervical, body and incisal tooth sites [PDF]

, 2012
Introduction The ability of a thermal diffusion system (TDS) to promote the tooth-whitening actions of a bleaching gel/bleaching activator combination product (containing a final hydrogen peroxide (H2O2) content of 10.0% (w/v)) towards discoloured 'smile-
Grootveld, Martin, Chan, W., Lynch, Edward, Dr., Lynch, E., W. Chan, M. Grootveld, E. Lynch   +6 more
core   +1 more source

Early stages of tooth development in the harbor porpoise Phocoena phocoena

The Anatomical Record, EarlyView.
Abstract Here we describe the stages of tooth development in toothed whales on the basis of the harbor porpoise (Phocoena phocoena). The aim of the study was to find out whether these stages are identical to those of other mammals analyzed so far although toothed whales are homodont and monophyodont.
Lasse M. Mathes, Lennart Müller‐Thomsen, Stefan Huggenberger   +2 more
wiley   +1 more source

Simulation Analysis of the Dynamic Performance of Multi Tooth Meshing of Filtering Reducer based on ANSYS- LS / DYNA

Jixie chuandong, 2015
The filtering reducer structure principle and multi tooth elastic meshing effect are introduced,with the help of explicit dynamics software ANSYS / LS- DYNA,the three- dimensional nonlinear finite element contact analysis model is established,the dynamic
Lei Xiaochun, Yang Rongsong, Zhu Bingfeng, Liu Qiang, Chen Zhiliang   +4 more
doaj  

Tooth contact analysis of x-zero helical gears by the modification of the tooth trace

International Journal of Automotive Science and Technology, 2019
The helical gear pairs are widely used in different mechanical constructs. The main advantage is the good efficiency and the low noise during the connection.We have worked out a computer software with which the designing process of the helical gears could be eased. Based on the calculated gear parameters the CAD models of the elements could be prepared.
openaire   +4 more sources