scholarly journals Determining the optimum heating time of small sized test specimen made from weldable mild steel

2020 ◽  
Vol 903 ◽  
pp. 012033
Author(s):  
F Tancsics ◽  
T Ibriksz
Keyword(s):  
Mild Steel ◽  
Test Specimen ◽  
Heating Time ◽  
Optimum Heating

scholarly journals Pemanfaatan Gulma Siam (Chromolaena odarata L.) Sebagai Adsorben Logam Timbal

2020 ◽  
Vol 2 (1) ◽  
pp. 27-34
Author(s):  
Erni Mohamad ◽  
Intan J. Oputu ◽  
Julhim S. Tangio
Keyword(s):  
Activated Carbon ◽  
Activated Charcoal ◽  
Heating Time ◽  
Ion Adsorption ◽  
Chromolaena Odorata ◽  
Carbon Quality ◽  
Industry Standard ◽  
Optimum Ph ◽  
Optimum Heating ◽  
Time Required

This study aims to utilize (Chromolaena odorata L) as a metal adsorbent. The methods used to make activated charcoal are dehydration, carbonization, and activation. The activated carbon is then characterized to obtain activated charcoal that can be applied, then optimized. The results of activated carbon characterization obtained have reached the activated carbon quality requirements based on the Indonesian Industry Standard (SII No. 0258-88). Based on the adsorption test, the optimum pH of Pb2+ (Pb (NO3) 2 (in distilled water) Chromolaena odorata L charcoal activated by NaOH 0.2 M under varying pH (2,3,4,5,6) is at pH 5 with 69.00% absorption. The optimum contact time required for Pb ion adsorption is 4 hours at variation (1-5 hours) with 70.19% absorption. The optimum concentration at variation (concentration 20; 40; 60; 80; 100 ppm) on Pb ion adsorption is 100 ppm with 76.15% absorption. The optimum heating time is a variation of 1.5; 2; 2.5; and 3 hours of Pb ion adsorption is one hour 30 minutes with an absorption of 65.95%. Based on the optimization results, the activated carbon from the Chromolaena odorata L can be used as an adsorption material against the contamination of lead heavy metals (Pb).

Effects of Heating Time, Electric Power and Frequency on Bending Fatigue Strength of Induction Hardened Gears

2006 ◽  
Vol 118 ◽  
pp. 527-532 ◽  
Author(s):  
Kouitsu Miyachika ◽  
Kazuteru Oda ◽  
Hideaki Katanuma ◽  
Jun Iwanaga ◽  
Satoshi Oda
Keyword(s):  
Fatigue Strength ◽  
Electric Power ◽  
Fatigue Test ◽  
Hardened Layer ◽  
Heating Time ◽  
Bending Fatigue ◽  
Bending Fatigue Test ◽  
Optimum Heating ◽  
Bending Fatigue Strength ◽  
Micro Structures

The measurement of hardened layer and the bending fatigue test of S35C and S45C steel gears induction-hardened under various heating conditions were carried out, and then profiles of hardened layer and S-N curves (bending fatigue strength) were obtained. Effects of the heating time, the electric power and the frequency on profiles and micro-structures of hardened layers of gears were examined. Relationship between the bending fatigue strength and the profile of hardened layer was determined. Optimum heating conditions for the bending fatigue strength of induction-hardened S35C and S45C steel gears were indicated.

DEKOMPOSISI AMPAS TEBU SECARA TERMOKIMIA DALAM AIR PANAS BERTEKANAN

EKUILIBIUM ◽  
2012 ◽  
Vol 11 (1) ◽  
Author(s):  
Bregas Siswo Tatag Sembodo
Keyword(s):  
Heating Time ◽  
Tube Furnace ◽  
Solid Product ◽  
Biomass Waste ◽  
Large Numbers ◽  
Time Variations ◽  
Optimum Heating ◽  
Hot Compressed Water ◽  
Thermochemical Decomposition

<p><strong><em>Abstract:</em></strong><em> Recently, waste bagasse in large numbers only thrown away, burned, and have notbeen used optimally. Although bagasse has been used, the waste bagasse is still piling up and considered as waste that pollute the environment. To take advantage of this biomass waste, themethod chosen is a thermochemical decomposition in hot compressed water. A 100 mL autoclave used in the experiment was loaded with 5 g dry powdered bagasse, 0.25 g catalyst (sodiumcarbonate) and 65 mL water. After having blown with nitroqen, the autoclave washeated in the tube furnace until the temperature was 280<sup>0</sup>C, and then kept at this temperaturefor the desired time. The desired time variations are 65, 70, 75, 80, and 85 minutes. The liquidand the solid product removed from the autoclave were separated by filtration. The liquidproduct was distillated to obtain oil. The results showed that the maximum oil was obtained at280<sup>0</sup>C with an optimum heating time was 80 minutes. From the analysis by GC-MS methode,the oil obtained contains several compounds such as ketones, phenols and its derivatives,syringol and its derivatives, furan and its derivatives, and offrers.</em></p><p><em> </em><strong><em>Keywords:</em></strong><em> waste bagasse, thermochemical decomposition, GC-MS, syringol.</em></p>

A Laboratory Method for the Evaluation of Oil Production Corrosion Inhibitors★

CORROSION ◽  
1956 ◽  
Vol 12 (8) ◽  
pp. 17-21 ◽  
Author(s):  
DAVID B. BOIES
Keyword(s):  
Mild Steel ◽  
Gas Phase ◽  
Test Specimen ◽  
Corrosion Inhibitors ◽  
Oil Production ◽  
Laboratory Method ◽  
Test Method ◽  
Field Conditions ◽  
Aromatic Content ◽  
Oil Blend

Abstract A test method used to screen and evaluate oil production corrosion inhibitors is described. Laboratory conditions are made to approximate field conditions as closely as possible with 20 ga mild steel (SAE 1010) as the test specimen. The effects on inhibitor performance of such variables as temperature, oil-brine ratio, aromatic content of oil blend, and composition of gas phase are shown graphically. 2.3.4

Optimum Heating of Thick Wall Pressure Components of Steam Boilers

2014 ◽  
Author(s):  
Piotr Dzierwa ◽  
Dawid Taler ◽  
Jan Taler ◽  
Marcin Trojan
Keyword(s):  
Heating Time ◽  
Thick Wall ◽  
Heating Process ◽  
Fluid Temperature ◽  
European Standard ◽  
Temperature Changes ◽  
Constant Rate ◽  
Steam Boilers ◽  
Optimum Heating ◽  
Temperature Heating

A method for determining time-optimum fluid temperature changes is presented. In contrast to present standards, two points at the edge of the opening are taken into consideration. The optimum fluid temperature changes are assumed in the form of a simple time function. It is possible to increase the fluid temperature stepwise and then the fluid temperature can be increased with a constant rate at the beginning of the heating process. Due to the stepwise increase in fluid temperature, heating time of a thick-walled component is of the same order as in the case of calculations according to EN 12952-3 European Standard, but the total circumferential stresses on the edge of the hole do not exceed the allowable value.

scholarly journals Derivatization and Spectrophotometric Quantification of Pamidronate in Bulk and Dosage Forms

2020 ◽  
pp. 40-46
Author(s):  
Sherif A. Abdel- Gawad
Keyword(s):  
Quality Control ◽  
Method Validation ◽  
Heating Time ◽  
Dosage Forms ◽  
Optimum Temperature ◽  
Reaction Conditions ◽  
Ich Guidelines ◽  
Validation Parameters ◽  
Optimum Ph ◽  
Optimum Heating

Aims: To quantify pamidronate in a sensitive and accurate way either in bulk or dosage forms. Methodology: The quantification of this group of drugs is a challenging task as they lack the presence of chromophore groups in their structure. The proposed method depends on the derivatization of the studied drug by its reaction with 4-Chloro-7-nitro-2,1,3-benzoxazole and the product is measured spectrophotometrically at 470 nm. The conditions for the reaction are optimized regarding the volume of the reagent, the optimum pH for the reaction completion, the buffer volume, the optimum temperature for the reaction and the optimum heating time. Results: The studied drug can be determined in the range of 9-30 µg/mL after optimizing the reaction conditions. Method validation is performed according to ICH guidelines and different validation parameters like, linearity, accuracy, precision and robustness are calculated and found to be excellent. Conclusion: The proposed method is accurate, sensitive and can be applied for the routine analysis of pamidronate in quality control laboratories.

Low cycle fatigue of steels under biaxial straining

1967 ◽  
Vol 2 (2) ◽  
pp. 117-126 ◽  
Author(s):  
K J Pascoe ◽  
J W R de Villiers
Keyword(s):  
Fatigue Life ◽  
Mild Steel ◽  
Test Specimen ◽  
Low Cycle Fatigue ◽  
Fracture Propagation ◽  
Strain Range ◽  
Shear Plane ◽  
Total Strain ◽  
Cycle Fatigue ◽  
Total Strain Range

A cruciform test specimen and a loading rig are described, by which any combination of biaxial strains can be applied to a specimen. With the pressurizing equipment so far available, three states of strains have been investigated for two steels. In the mild steel used, large inclusions oriented in the roll direction aided fracture propagation when a maximum shear plane coincided with the roll direction. When not influenced by inclusions, fatigue life is related to total strain range by Coffin's law         ∊ N a = C The values of α and C are different for different states of strains. Empirical formulae are given to predict results for other states of strains.

scholarly journals PEMANFAATAN GETAH BIDURI DALAM PRODUKSI ALBUMIN IKAN GABUS (Ophiocephalus striatus)

KOVALEN ◽  
2016 ◽  
Vol 2 (3) ◽  
Author(s):  
Ita Mustrini ◽  
Mappiratu Mappiratu ◽  
Nurakhirawati Nurakhirawati
Keyword(s):  
Heating Time ◽  
Protein Yield ◽  
Enzyme Protein ◽  
Warm Up ◽  
Protease Enzyme ◽  
Randomized Design ◽  
Optimum Heating ◽  
Completely Randomized Design ◽  
Extract Protein

The Research about utilization of sap Biduri in the production of albumin fish cork (Ophiocephalus striatus). Has been done This research  purposes to determine the ratio of sap Biduri to extract cork fish that produce the protein albumin with the highest yield and optimum heating time which produces the highest yield of the protein albumin. The study used a completely randomized design (CRD), which consists of the influence of the ratio of sap Biduri to extract protein and the effect of heating time Biduri to extract latex mixture. Each treatment is done twice to obtain 22 units of the experiment. The highest protein yield was obtained at a ratio of sap Biduri 3,0 : 30 and the heating time of 60 minutes at 53,43 %. The purity of the highest degree obtained at the optimum 50 minutes warm up period of 35.50 %.Keywords : Fish Cork, Biduri Protease enzyme, Protein yield of albumin, Albumin purity degree

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