Results 111 to 120 of about 447,007 (315)

The analysis of influence the parameters of rolling process in three high skew rolling mill of AZ31 magnesium alloy bars on temperature distribution

Metalurgija, 2016
The work presents the results of numerical investigations of AZ31 magnesium alloy bars obtaining by the rolling process in a three high skew rolling mill.
A. Gryc, T. Bajor, H. Dyja
doaj  

Mechanism of integrated forming of shape and inner hole of hollow axle

Metalurgija, 2022
The paper introduces a new technology of the integrated forming of shape and inner hole of hollow axle. Firstly, the design of the process is described. Secondly, the range of feed angle of two sets of rolls and the principle to be followed are explained.
C. Q. Ye, X. D. Shu, Y. X. Xia, J. T. Wang, S. Zhang   +4 more
doaj  

Motion Planning for Kinematic systems

, 2012
In this paper, we present a general theory of motion planning for kinematic systems. This theory has been developed for long by one of the authors in a previous series of papers. It is mostly based upon concepts from subriemannian geometry.
Boizot, Nicolas, Gauthier, Jean-Paul
core   +3 more sources

A Comparison of Realized Measures of Integrated Volatility: Price Duration‐ vs. Return‐Based Approaches

Journal of Forecasting, EarlyView.
ABSTRACT We study the accuracy of a variety of parametric price duration‐based realized variance estimators constructed via various financial duration models and compare their forecasting performance with the performance of various nonparametric return‐based realized variance estimators.
Björn Schulte‐Tillmann, Mawuli Segnon, Timo Wiedemann   +2 more
wiley   +1 more source

Machine Learning Approaches to Forecast the Realized Volatility of Crude Oil Prices

Journal of Forecasting, EarlyView.
ABSTRACT This paper presents an evaluation of the accuracy of machine learning (ML) techniques in forecasting the realized volatility of West Texas Intermediate (WTI) crude oil prices. We compare several ML algorithms, including regularization, regression trees, random forests, and neural networks, to several heterogeneous autoregressive (HAR) models ...
Talha Omer, Kristofer Månsson, Pär Sjölander, Gazi Salah Uddin   +3 more
wiley   +1 more source

Effect of process parameters on average grain size and microscopic uniformity of the three-roll skew rolling forming of the railway hollow shaft

Metalurgija, 2020
The average grain size and microstructure uniformity are the key factors determining the mechanical properties of the hollow shaft. In order to obtain a fine and uniform microstructure, a finite element model of threeroll skew rolling hollow shaft for ...
J. T. Wang, X. D. Shu, S. Zhang
doaj  

Study on the variation law of temperature field in three-roll skew rolling of variable diameter specimen

Metalurgija, 2022
This paper takes the simplified high-speed train hollow axle variable diameter section sample as the research object, uses Simufact.Forming simulation software for simulation, analyze the rolling piece inner variable diameter section, equal diameter ...
X. G. Chen, X. D. Shu, J. N. Shi
doaj  

On the rotational dynamics of the Rattleback

, 2012
The Rattleback is a very popular science toy shown to students all over the world to demonstrate the non-triviality of rotational motion. When spun on a horizontal table, this boat-shaped object behaves in a peculiar way.
A Encinas-Oropesa, A I Akhiezer, A V Chumak, B A Kalinikos, C G Hu, C Mathieu, D Grundler, F G Aliev, G N Kakazei, J Jorzick, K Yu Guslienko, Kh Zakeri, M Bauer, M R Freeman, P F Carcia, R Arias, R D Averitt, R D Averitt, R P Stapele van, R Skomski, S M Chérif, T M Crawford, V V Kruglyak, V V Kruglyak, V V Kruglyak   +24 more
core   +1 more source

A Deep Learning Framework for Forecasting Medium‐Term Covariance in Multiasset Portfolios

Journal of Forecasting, EarlyView.
ABSTRACT Forecasting the covariance matrix of asset returns is central to portfolio construction, risk management, and asset pricing. However, most existing models struggle at medium‐term horizons, several weeks to months, where shifting market regimes and slower dynamics prevail.
Pedro Reis, Ana Paula Serra, João Gama
wiley   +1 more source

Numerical simulation and experimental investigation of microstructure and mechanical properties of flexible skew rolling TC11 alloy based on finite element model coupled with microscopic parameters

Journal of Materials Research and Technology
In this study, the finite element model coupling with multiple internal-state-variable parameters was used to numerically investigate the forming and microstructure evolution of TC11 titanium alloy shafts formed by flexible skew rolling.
Pengni Feng, Kangning Jin, Baoyu Wang, Cuiping Yang, Huajun Yan, Guang Yang, Yongdi Zhang   +6 more
doaj   +1 more source