نتایج جستجو برای: microstructure analysis

تعداد نتایج: 2857885  

2016
Flavia Barsotti Simona Sanfelici

Default probability is a fundamental variable determining the credit worthiness of a firm and equity volatility estimation plays a key role in its evaluation. Assuming a structural credit risk modeling approach, we study the impact of choosing different non parametric equity volatility estimators on default probability evaluation, when market microstructure noise is considered. A general stocha...

Journal: :مهندسی متالورژی و مواد 0
محمد حسن عوض کننده قراول محسن حداد سبزوار

the micro-segregation in binary al-cu alloys containing 2.2, 3.7, and 4.8 wt.% copper was investigated by differential thermal analysis (dta) and numerical modeling. for this purpose, the alloys were melted using a dta furnace with the capability of quenching samples during solidification. the melted samples were cooled at 0.008 and 0.083 k/s and subsequently quenched from predetermined tempera...

Journal: :J. Comput. Physics 2007
Lijian Tan Nicholas Zabaras

A two-scale model based on a database approach is presented to investigate alloy solidification. Appropriate assumptions are introduced to describe the behavior of macroscopic temperature, macroscopic concentration, liquid volume fraction and microstructure features. These assumptions lead to a macroscale model with two unknown functions: liquid volume fraction and microstructure features. Thes...

2011
C. YANG

Results of research on application of modern numerical approaches for analysis of influence of microstructure heterogeneities on strain distribution during material processing are presented in this work. This work is part of the research towards development of the tool for detailed microstructure modeling. The main focus here is put on the micro scale behavior, where advantages of digital mater...

Journal: :international journal of iron & steel society of iran 2015
r. sepehrzad e. heshmat dehkordi a. shafiei a. afkhami aqda a. estiri

stress relieving is a common practice among manufacturing codes for reducing the magnitude ofresidual stresses in welded, quenched, and tempered steel structures and pressure vessels. the presentwork investigates the effect of stress relieving at 480, 560, 620, and 680°c on the microstructure andmechanical properties of 20 mm astm a517 gr. b steel plate weldments produced by shielded metal arcw...

2016
Arun M. Gokhale

It is well known that material chemistry and processing dictate material microstructure and microstructure influences properties and performance of materials. Consequently, quantitative characterization and statistical representation of microstructure are of considerable importance in materials science. Microstructure is essentially a collection of three-dimensional volumes (for example, grains...

2017
MARCO PICCININI

A three dimensional (3D) fully coupled thermal-mechanical analysis is presented in order to evaluate the influence of certain cutting parameters as well as dual phase microstructure on the orthogonal micro cutting process of steels (in particular, AISI 1045 steel), for which the size of heterogeneities is of the order of magnitude of the uncut chip thickness and tool edge radius. The simulated ...

2017
Claire E Sexton Enikő Zsoldos Nicola Filippini Ludovica Griffanti Anderson Winkler Abda Mahmood Charlotte L Allan Anya Topiwala Simon D Kyle Kai Spiegelhalder Archana Singh-Manoux Mika Kivimaki Clare E Mackay Heidi Johansen-Berg Klaus P Ebmeier

Both sleep disturbances and decline in white matter microstructure are commonly observed in ageing populations, as well as in age-related psychiatric and neurological illnesses. A relationship between sleep and white matter microstructure may underlie such relationships, but few imaging studies have directly examined this hypothesis. In a study of 448 community-dwelling members of the Whitehall...

2017
Tessa L. Rausch Diane L. Kendall Sara T. Kover Elizabeth M. Louw Ursula L. Zsilavecz Anita van der Merwe

BACKGROUND AND OBJECTIVE Children with attention-deficit hyperactivity disorder (ADHD) experience difficulty with expressive language, including form (e.g. grammatical construction) and content (e.g. coherence). The current study aimed to investigate the effect of methylphenidate-Osmotic Release Oral System® (MPH-OROS®) on the narrative ability of children with ADHD and language impairment, thr...

2010
Panagiotis Blitsas Evangelia Gouli Maria Grigoriadou

The basic objective of this work is the knowledge representation of the content of Computer Science texts on the basis of a text comprehension model, by using concept maps. According to this model, a reader of a text constructs microstructure and macrostructure of its knowledge content. Microstructure is considered as the relational structure, which describes the static relations among the enti...

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