Influence of temperature in continuous single-pass precipitation of aluminum hydroxide on quality of activated aluminum oxide

1977 ◽  
Vol 13 (5) ◽  
pp. 336-337
Author(s):  
N. P. Poezd ◽  
E. D. Radchenko ◽  
I. M. Kolesnikov ◽  
D. F. Poezd ◽  
I. P. Basmanov
Keyword(s):  
Aluminum Oxide ◽  
Aluminum Hydroxide ◽  
Influence Of Temperature ◽  
Single Pass ◽  
Activated Aluminum Oxide

Investigation of catalysts based on activated aluminum oxide, prepared by single-pass continuous precipitation

1978 ◽  
Vol 14 (8) ◽  
pp. 591-593
Author(s):  
N. P. Poezd ◽  
I. Ya. Perezhigina ◽  
E. D. Radchenko ◽  
D. F. Poezd ◽  
A. V. Agafonov ◽  
...  
Keyword(s):  
Aluminum Oxide ◽  
Continuous Precipitation ◽  
Single Pass ◽  
Activated Aluminum Oxide

Properties of activated aluminum oxide as influenced by rate of feeding solutions of sodium aluminate and basic aluminum sulfate in continuous single-pass precipitation

1977 ◽  
Vol 13 (1) ◽  
pp. 38-39
Author(s):  
N. P. Poezd ◽  
E. D. Radchenko ◽  
I. M. Kolesnikov ◽  
D. F. Poezd ◽  
I. P. Basmanov
Keyword(s):  
Aluminum Oxide ◽  
Aluminum Sulfate ◽  
Sodium Aluminate ◽  
Single Pass ◽  
Basic Aluminum ◽  
Activated Aluminum Oxide

scholarly journals The influence of temperature and TMGa flow rate on the quality of p-GaN

AIP Advances ◽  
2021 ◽  
Vol 11 (3) ◽  
pp. 035109
Author(s):  
Zikun Cao ◽  
Xiaowei Wang ◽  
Degang Zhao ◽  
Feng Liang ◽  
Zongshun Liu
Keyword(s):  
Flow Rate ◽  
Influence Of Temperature

Einfluss der Abrichtgrößen beim Schleifen*/Influence of dressing parameters on the grinding process - Systematic research of dressing parameters on workpiece roughness and surface integrity

2016 ◽  
Vol 106 (01-02) ◽  
pp. 44-50
Author(s):  
T. Lierse ◽  
B. Karpuschewski ◽  
T. R. Kaul
Keyword(s):  
Aluminum Oxide ◽  
Surface Integrity ◽  
Cvd Diamond ◽  
Grinding Wheel ◽  
Systematic Research ◽  
Grinding Process ◽  
Wheel Topography ◽  
Grinding Wheel Topography

Dieser Beitrag zeigt, dass die durch die Abrichtparameter erzeugte Schleifscheibentopographie nicht nur die Oberflächengüte des Werkstücks, sondern auch dessen Eigenspannungszustand in der Werkstückrandzone in weiten Grenzen verändert. Die Untersuchungen zum Abrichten von Korundschleifscheiben mit einer CVD-Diamantformrolle stellen den Zusammenhang zwischen dem Abrichten unterschiedlicher Schleifscheiben zur Bauteilqualität in Form der Oberflächenrautiefe und randzonennahen Eigenspannungen her.   The quality of the workpiece rim is changed by every grinding process. The grinding wheel topography created by the dressing process has not only influence on the workpiece roughness but also on the surface integrity. The pointed research using aluminum oxide abrasive wheels dressed by CVD diamond dressing discs shows a correlation between the dressing parameters, the workpiece roughness and the surface integrity.

scholarly journals Preservatives Stability: Stability Study of Parabens under Different Conditions of Stress Degradation

2020 ◽  
Vol 11 (3) ◽  
pp. 4187-4194
Author(s):  
Ismail Bennani ◽  
Madiha Alami Chentoufi ◽  
Miloud El Karbane ◽  
Ibrahim Sbai El Otmani ◽  
Amine Cheikh ◽  
...  
Keyword(s):  
Extreme Values ◽  
Stability Study ◽  
Wide Field ◽  
Direct Influence ◽  
Light Conditions ◽  
Influence Of Temperature ◽  
Stress Degradation ◽  
Quality Of Products ◽  
The Stability

Preservatives are used in a wide field of application to maintain the quality of products. They are used to deal with the chemical, physical and microbiological problems and the constraints of the development of several formulations. In this work, we tested the stability of antimicrobial preservatives which are the parabens under different stress degradation conditions to evaluate their degree of effectiveness. The tested parabens were incubated in different solutions at different pH, Temperatures, light conditions, and presence or absence of sucrose in solution (create a medium similar of syrups). The HPLC was used for the assay, by a validated method for the parabens assay and the statistical analysis of the data is carried out by JMP software. The results show a direct influence of temperature and pH on the level of parabens, while the influence of light remains negligible. The increase in temperature gives a degree of immunity of parabens levels, especially with the extreme values of pH. This study is one of the first studies of forced decomposition of parabens carried out under the various conditions suggested. The results give an idea of the stability profile of the tested parabens and suggest a model of the conditions of conservation and use of these products in different domains and under different conditions.

Pyrolysis of water buffalo manure: Influence of temperature and alkali hydroxide additives on the quality of bio-oil

2021 ◽  
pp. 102230
Author(s):  
Günay Özbay ◽  
Ebru Koçak ◽  
Muhammad Syarhabil Ahmad
Keyword(s):  
Water Buffalo ◽  
Influence Of Temperature ◽  
Bio Oil ◽  
Alkali Hydroxide

Development of Toxic Degradation Products during Heat Sterilization of Glucose-Containing Fluids for Peritoneal Dialysis: Influence of Time and Temperature

1995 ◽  
Vol 15 (1) ◽  
pp. 26-32 ◽  
Author(s):  
Per Kjellstrand ◽  
Evi Martinson ◽  
Anders Wieslander ◽  
Björn Holmquist
Keyword(s):  
Peritoneal Dialysis ◽  
Glucose Solution ◽  
Degradation Products ◽  
General Pattern ◽  
Low Ph ◽  
Uv Absorbance ◽  
Influence Of Temperature ◽  
In Vitro Systems

Objective Fluids for peritoneal dialysis (PD) cause cytotoxic reactions in many different in vitro systems. The low pH, the high osmolality of the fluids, and the glucose degradation products formed during heat sterilization have been considered responsible. In the present study, we investigate the influence of temperature and time during heat sterilization of PD fluids and glucose solutions on glucose degradation and cytotoxicity of the solutions. Design Ampoules containing PD-fluid or glucose solution were heated in an oil bath to predetermined F o values (combinations of time and temperature giving equal energy/bacteriallethality). Cytotoxicity of the solutions was measured as groWth inhibition of cultured L-929 fibroblasts. Glucose degradation was measured as UV absorbance at 228 and 284 nm. Results The same general pattern was seen in both PD fluid and glucose solution. Cytotoxicity decreased from 90% to 15% when the sterilization temperature was increased from 115° to 140°C and concomitantly the length of time shortened in order to maintain equal bacteriallethality. Under the same conditions, degradation products, measured as UV absorbance at 284 nm, decreased from 0.2 to 0.02. Conclusion To minimizethe development of cytotoxic breakdown products, high temperatures over short periods of time should be used to heat-sterilize PD fluids. Even as small an increase as 5°C at around 120°C will improve the quality of the solutions.

Eliminating Redundant Operations While Improving Part Quality by Modeling Machining Errors

2005 ◽  
Author(s):  
John Agapiou ◽  
Eric Steinhilper ◽  
Pulak Bandyopadhyay ◽  
Jeffrey Q. Xie
Keyword(s):  
Main Axis ◽  
Machining Process ◽  
Single Pass ◽  
Form Errors ◽  
Part Quality ◽  
Machining Errors ◽  
Transmission Case ◽  
System Errors

A methodology to predict part quality was applied to the perpendicularity quality of the bell face and main axis of a transmission case. By modeling the quality of different processing sequences, we were able to show that the quality of the part - perpendicularity of critical features - does not improve significantly by performing two-pass machining process instead of a single-pass. This application of our quality methodology required the modeling of additional system errors which were not developed in the earlier version and which were needed to predict certain types of form errors. In addition to improved part quality, changing the existing line to a single-pass process eliminated a bothersome job-setting procedure and tooling costs at the second-pass and increased productivity of a rebalanced line.

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