scholarly journals One-step and selective extraction of nickel from nickel-based superalloy by molten zinc

2021 ◽  
Vol 31 (6) ◽  
pp. 1828-1841
Author(s):  
Qing-hua TIAN ◽  
Xiang-dong GAN ◽  
Da-wei YU ◽  
Fu-hui CUI ◽  
Xue-yi GUO
Keyword(s):  
Selective Extraction ◽  
Molten Zinc ◽  
Nickel Based Superalloy ◽  
One Step

Manufacturing of Functionally Graded Materials

2000 ◽  
Author(s):  
Franz-Josef Kahlen ◽  
Aravinda Kar
Keyword(s):  
Functionally Graded ◽  
Graded Materials ◽  
Nickel Based Superalloy ◽  
Melt Pool ◽  
Plume Temperature ◽  
One Step ◽  
Solid Liquid ◽  
Melt Pool Characteristics ◽  
Deposition Height ◽  
Metal Layers

Abstract Laser deposition of metal layers has been recognized in recent years as a one-step process to fabricate metal parts. A one-dimensional model was developed to calculate the plume temperature, process parameters and melt pool characteristics. The model accounts for the transmission of the laser beam through the plume, energy transfer in the molten phase and the Stefan conditions at the solid-liquid and liquid-vapor interfaces. The surface temperature at the molten surface is found to exceed the normal boiling temperature causing the pressure to be higher than one atmospheric pressure. The plume temperatures were found to be below the respective material’s ionization temperature. The calculated plume temperatures are in good agreement with the values obtained from the spectral data. Also, the model predictions for remelt layer depth, deposition height and plasma height compare well with experimental data. The authors have employed this one-step technique to create graded materials by varying the part’s composition from 100% stainless steel to a 100% nickel-based superalloy. Mechanical properties of these graded materials are measured and the effects of slow solidification rates are investigated.

Aptamer entrapment in microfluidic channel using one-step sol-gel process, in view of the integration of a new selective extraction phase for lab-on-a-chip

2017 ◽  
Vol 38 (19) ◽  
pp. 2456-2461 ◽  
Author(s):  
Camille Perréard ◽  
Fanny d'Orlyé ◽  
Sophie Griveau ◽  
Baohong Liu ◽  
Fethi Bedioui ◽  
...  
Keyword(s):  
Sol Gel ◽  
Microfluidic Channel ◽  
Lab On A Chip ◽  
Selective Extraction ◽  
Sol Gel Process ◽  
One Step ◽  
Extraction Phase

Selective Extraction of ECG from Tea Polyphenols by One Step in Centrifugal Contactor Separators: Modeling and Application

2019 ◽  
Vol 58 (5) ◽  
pp. 2027-2035 ◽  
Author(s):  
Wanru Wang ◽  
Panliang Zhang ◽  
Jian Ou ◽  
Fusong Liu ◽  
Kewen Tang ◽  
...  
Keyword(s):  
Selective Extraction ◽  
Tea Polyphenols ◽  
One Step ◽  
Centrifugal Contactor

scholarly journals Selective Extraction of Ni from Superalloy Scraps by Molten Mg-Zn

Metals ◽  
2021 ◽  
Vol 11 (6) ◽  
pp. 993
Author(s):  
Qinghua Tian ◽  
Xiangdong Gan ◽  
Fuhui Cui ◽  
Dawei Yu ◽  
Xueyi Guo
Keyword(s):  
Vacuum Distillation ◽  
Heating Temperature ◽  
Selective Extraction ◽  
Heating Time ◽  
Metal Extraction ◽  
Molar Ratio ◽  
Distillation Process ◽  
Mass Ratio ◽  
Critical Metals ◽  
Nickel Based Superalloy

Bearing significant concentrations of high value and critical metals, superalloy scraps require comprehensive recycling for metal reclamation. In this study, nickel-based superalloy was treated with molten Mg-Zn for the selective extraction of nickel. The influence of heating temperature, the molar ratio of Mg to Zn in the molten metal, Mg-Zn/superalloy mass ratio, and heating time on metal extraction were investigated. Using the heating temperature of 800 °C, the Mg/Zn molar ratio of 9/1, the Mg-Zn/superalloy mass ratio of 5/1, and heating time of 240 min, the extraction rate of 97.1% was achieved for Ni, and the extraction rates of Fe, Cr and refractory metals (Nb, Mo and Ti) were all less than 1%. In the subsequent vacuum distillation process, nickel with a purity of 98.3 wt% was obtained. Therefore, the proposed method is a short, clean, and efficient process for selectively extracting nickel from the superalloy scraps.

An Interactive Minicomputer Program for the Indexing and Simulation of Electron Diffraction Patterns

1976 ◽  
Vol 34 ◽  
pp. 542-543
Author(s):  
R.P. Goehner ◽  
W.T. Hatfield ◽  
Prakash Rao
Keyword(s):  
Electron Diffraction ◽  
Real Time ◽  
Pattern Analysis ◽  
Flow Diagram ◽  
Hard Copy ◽  
Time Analysis ◽  
Real Time Analysis ◽  
Transmission Electron ◽  
One Step ◽  
Diffraction Patterns

Computer programs are now available in various laboratories for the indexing and simulation of transmission electron diffraction patterns. Although these programs address themselves to the solution of various aspects of the indexing and simulation process, the ultimate goal is to perform real time diffraction pattern analysis directly off of the imaging screen of the transmission electron microscope. The program to be described in this paper represents one step prior to real time analysis. It involves the combination of two programs, described in an earlier paper(l), into a single program for use on an interactive basis with a minicomputer. In our case, the minicomputer is an INTERDATA 70 equipped with a Tektronix 4010-1 graphical display terminal and hard copy unit.A simplified flow diagram of the combined program, written in Fortran IV, is shown in Figure 1. It consists of two programs INDEX and TEDP which index and simulate electron diffraction patterns respectively. The user has the option of choosing either the indexing or simulating aspects of the combined program.

Nutrient-regulated gene expression in eukaryotes

2006 ◽  
Vol 73 ◽  
pp. 85-96 ◽  
Author(s):  
Richard J. Reece ◽  
Laila Beynon ◽  
Stacey Holden ◽  
Amanda D. Hughes ◽  
Karine Rébora ◽  
...  
Keyword(s):  
Gene Expression ◽  
Rna Polymerase ◽  
Rna Polymerase Ii ◽  
Transcriptional Control ◽  
Direct Interaction ◽  
Signalling Pathways ◽  
A Cell ◽  
One Step ◽  
Higher Eukaryotes ◽  
Regulated Gene Expression

The recognition of changes in environmental conditions, and the ability to adapt to these changes, is essential for the viability of cells. There are numerous well characterized systems by which the presence or absence of an individual metabolite may be recognized by a cell. However, the recognition of a metabolite is just one step in a process that often results in changes in the expression of whole sets of genes required to respond to that metabolite. In higher eukaryotes, the signalling pathway between metabolite recognition and transcriptional control can be complex. Recent evidence from the relatively simple eukaryote yeast suggests that complex signalling pathways may be circumvented through the direct interaction between individual metabolites and regulators of RNA polymerase II-mediated transcription. Biochemical and structural analyses are beginning to unravel these elegant genetic control elements.

CAD: One Step Forward, One Step Back

2010 ◽  
Vol 43 (18) ◽  
pp. 16
Author(s):  
MATTHEW R.G. TAYLOR
Keyword(s):  
One Step
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