An Empirical Process Model of Abstracting

2005 ◽  
Author(s):  
F.H. Hannover
Keyword(s):  
Process Model ◽  
Empirical Process

scholarly journals Research of a contact impact of a root crop with a screw auger

2020 ◽  
Vol 66 (No. 1) ◽  
pp. 33-42
Author(s):  
Viktor Baranovsky ◽  
Olena Truchanska ◽  
Maria Pankiv ◽  
Valentina Bandura
Keyword(s):  
Process Model ◽  
Empirical Process ◽  
Experimental Studies ◽  
Kinematic Parameters ◽  
Fodder Beet ◽  
Root Crop ◽  
Cleaning System ◽  
Screw Diameter ◽  
Contact Impact ◽  
Further Development

The purpose of this research is the further development of the methodology and methods of optimising the parameters of root pile  combined cleaners of a root crop harvesting machine. We have conducted theoretical and experimental studies of the combined  cleaning system’s functioning process. By executing the analysis, we found the motion of the fodder beet through the working surfaces of the feeding conveyor and the auger installed above it. We have got an analytical and empirical process model for the fodder beet’s oblique sub-hit on the auger turn. It characterises the dependence of the total rate of the sub-hit coefficient of the technological  interaction of the roots and the depth of the root damage, which depend on the main parameters of the combined cleaning system. We found out the rational limits of the basic structural and kinematic parameters of the combined cleaning system by the provided minimum fodder beet damage. It is theoretically justified that the minimum damage to roots of the beet roots will be at a contact angle of zero (γ ≅ 0) or close to it. This condition is protected with the following combinations of parameters: a screw diameter of D = 0.4, 0.6, 0.8 m and a screw speed of n = 99, 72, 50 rpm, respectively.

scholarly journals Development of an Empirical Process Model for Adjusted Porosity in Laser-Based Powder Bed Fusion of Ti-6Al-4V

2021 ◽  
Author(s):  
Nicole Emminghaus ◽  
Johanna Paul ◽  
Christian Hoff ◽  
Jörg Hermsdorf ◽  
Stefan Kaierle
Keyword(s):  
Functionally Graded Materials ◽  
Process Model ◽  
Empirical Process ◽  
Defect Formation ◽  
Functionally Graded ◽  
Powder Bed Fusion ◽  
Graded Materials ◽  
Powder Bed ◽  
Lack Of Fusion ◽  
Gas Porosity

Abstract A promising approach to address the mismatch of bone and implant stiffness, leading to the stress-shielding phenomenon, is the application of functionally graded materials with adjusted porosity. Although defect formation and porosity in laser-based powder bed fusion of metals (PBF-LB/M) are already widely investigated, so far there is little research on the influences and parameter interactions regarding the pore characteristics. This work therefore aims to provide an empirical process model for the generation of gas porosity in the PBF-LB process of Ti-6Al-4V. For the first time, parts with closed locally adjusted porosity of ~ 6 % achieved through gaseous pores instead of lack-of-fusion defects or lattice structures were built by PBF-LB. Parameter variation and evaluation of relative density, pore size and sphericity was done in accordance with the design of experiments approach. A parameter set for maximum gas porosity (laser power of 189 W, scanning speed of 375 mm/s, hatch spacing of 150 µm) was determined for a constant layer thickness of 30 µm and a spot diameter of 35 µm. Tensile tests were conducted with specimens consisting of a core with maximum gas porosity or lack-of-fusion porosity, respectively, and a dense skin as well as fully dense specimens. Whereas lack of fusion defects can lead to significant reduction of stiffness, the elastic modulus remained unchanged when implementing spherical pores. Nevertheless, the found superior strength and ductility of specimens with gas porous core underline the advantages of adjusted porosity for the application in functionally graded materials and lightweight applications.

Empirical Process Model for Arsenic Diffusion in Si1-x-yGexCy Alloys

2011 ◽  
Vol 383-390 ◽  
pp. 6811-6816
Author(s):  
Abhishek A. Sharma ◽  
Santosh V. Telang ◽  
Ashish S. Shrivastav ◽  
Saikalash D. Shetty ◽  
Shweta U. Shetty
Keyword(s):  
Carbon Content ◽  
Thermal Diffusion ◽  
Process Parameters ◽  
Process Model ◽  
Empirical Process ◽  
Compressive Strain ◽  
Effective Diffusivity ◽  
Strained Si ◽  
Germanium Content ◽  
Diffusion Behavior

The thermal diffusion behavior of ion-implanted Arsenic (As) in SiGeC alloy has been investigated and modeled. This paper introduces an empirical model consisting of physics-based and process-based parameters for evaluating the effective diffusivity of Arsenic in SiGeC accurately. The different process parameters that were found to affect the diffusivity were – Germanium content (x), diffusion temperature (T) and Carbon content (y). Germanium content taken into account was 7% and 12.3% for compressive strain in the structure with a Carbon content of 0.2%. The model incorporates all the effects associated with the change in the process parameters which affect the diffusivity of As in compressively strained-Si1-x-yGexCy. The model was found to be extremely accurate in predicting the exact dependencies of As diffusivity on physics-based and process parameters. The proposed empirical process model may find suitable application in the prediction of thermal diffusion behavior of As in Si1-x-yGexCyprocess-flow as well as in improving the existing model in Silvaco’s TCAD suite.

An empirical process model to predict microalgal carbon fixation rates in photobioreactors

2018 ◽  
Vol 31 ◽  
pp. 334-346 ◽  
Author(s):  
Bojan Tamburic ◽  
Christian R. Evenhuis ◽  
Joseph R. Crosswell ◽  
Peter J. Ralph
Keyword(s):  
Process Model ◽  
Carbon Fixation ◽  
Empirical Process

scholarly journals Development of an empirical process model for adjusted porosity in laser-based powder bed fusion of Ti-6Al-4V

2021 ◽  
Author(s):  
Nicole Emminghaus ◽  
Johanna Paul ◽  
Christian Hoff ◽  
Jörg Hermsdorf ◽  
Stefan Kaierle
Keyword(s):  
Functionally Graded Materials ◽  
Process Model ◽  
Empirical Process ◽  
Defect Formation ◽  
Functionally Graded ◽  
Powder Bed Fusion ◽  
Graded Materials ◽  
Powder Bed ◽  
Lack Of Fusion ◽  
Gas Porosity

AbstractA promising approach to address the mismatch of bone and implant stiffness, leading to the stress-shielding phenomenon, is the application of functionally graded materials with adjusted porosity. Although defect formation and porosity in laser-based powder bed fusion of metals (PBF-LB/M) are already widely investigated, so far there is little research on the influences and parameter interactions regarding the pore characteristics. This work therefore aims to provide an empirical process model for the generation of gas porosity in the PBF-LB process of Ti-6Al-4V. Parts with closed locally adjusted porosity of $\sim $ ∼ 6 % achieved through gaseous pores instead of lack of fusion defects or lattice structures were built by PBF-LB. Parameter variation and evaluation of relative density, pore size and sphericity was done in accordance with the design of experiments approach. A parameter set for maximum gas porosity (laser power of 189 W, scanning speed of 375 mm/s, hatch spacing of 150 μm) was determined for a constant layer thickness of 30 μm and a spot diameter of 35 μm. Tensile tests were conducted with specimens consisting of a core with maximum gas porosity or lack of fusion porosity, respectively, and a dense skin as well as fully dense specimens. Whereas lack of fusion defects can lead to significant reduction of stiffness of 32.2 %, the elastic modulus remained unchanged at 110.0 GPa when implementing spherical pores. Nevertheless, the found superior strength and ductility of specimens with gas porous core (> 1100 MPa and > 0.05 mm/mm, respectively) underline the advantages of adjusted porosity for the application in functionally graded materials and lightweight applications.

Fundamental Research into Thin Films in a Developing Country

1972 ◽  
Vol 30 ◽  
pp. 500-501
Author(s):  
J.A. Eades ◽  
E. Grünbaum
Keyword(s):  
Thin Films ◽  
Growth Process ◽  
Empirical Process ◽  
Nucleation And Growth ◽  
Research Groups ◽  
Film Research ◽  
Fundamental Research ◽  
Controlled Deposition ◽  
The One ◽  
The University

In the last decade and a half, thin film research, particularly research into problems associated with epitaxy, has developed from a simple empirical process of determining the conditions for epitaxy into a complex analytical and experimental study of the nucleation and growth process on the one hand and a technology of very great importance on the other. During this period the thin films group of the University of Chile has studied the epitaxy of metals on metal and insulating substrates. The development of the group, one of the first research groups in physics to be established in the country, has parallelled the increasing complexity of the field.The elaborate techniques and equipment now needed for research into thin films may be illustrated by considering the plant and facilities of this group as characteristic of a good system for the controlled deposition and study of thin films.

Process \'prǎ|,ses\n: The Action of Moving Forward Progressively from One Point to Another on the Way to Completion

1979 ◽  
Vol 44 (1) ◽  
pp. 3-30 ◽  
Author(s):  
Carol A. Pruning
Keyword(s):  
Process Model ◽  
Communicative Behaviors ◽  
Adult Level ◽  
Remedial Programs ◽  
Stage Process ◽  
The Way

A rationale for the application of a stage process model for the language-disordered child is presented. The major behaviors of the communicative system (pragmatic-semantic-syntactic-phonological) are summarized and organized in stages from pre-linguistic to the adult level. The article provides clinicians with guidelines, based on complexity, for the content and sequencing of communicative behaviors to be used in planning remedial programs.

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