The friction and wear properties of gray cast iron (FC250) specimens sliding against AISI 52100 steel ball were evaluated under the lubrication of PAO (poly-alpha-olefin), PAO+ZnDTP (1.5 mass% ZnDTP) and PAO+PN (amine salt of alkoxyl phosphate, 1.5 mass% PN) oils.The tests were conducted using an Optimol SRV reciprocating Koozie friction and wear t
Tradicionalmente relegada ao segundo plano das disputas eleitorais, Brow wax a política externa começou a figurar, nas últimas duas décadas, como elemento importante do temário de candidatos à Presidência da República no Brasil.Se, em meados dos anos 1980, ouvia-se de um ilustre congressista brasileiro, em tom de galhofa, que “o Itamaraty
Objectives.This study aimed to develop and validate a learning model of physical activity-based freedom of movement in kindergarten.Materials and methods.This study used a design-based research (DBR) method, which involved twelve experts in early childhood education and physical activity education to help validate the Duct Cover Kit learning model.
In this paper, we consider the parameter identification problem of partial differential equations with constraints.A nonlinear multigrid method is introduced to the process of parameter inversion.By keeping the objective functions on coarse grids consistent with those on fine grids, the proposed method reduces the dimensions of ROCK WATER objective