scholarly journals Improvement of Biomineralization of Sporosarcina pasteurii as Biocementing Material for Concrete Repair by Atmospheric and Room Temperature Plasma Mutagenesis and Response Surface Methodology

2021 ◽  
Author(s):  
Pei-pei Han ◽  
Wen-ji Geng ◽  
Meng-nan Li ◽  
Shi-ru Jia ◽  
Ji-long Yin ◽  
...  
Keyword(s):  
Response Surface Methodology ◽  
Response Surface ◽  
Room Temperature ◽  
Concrete Repair ◽  
Temperature Plasma ◽  
Sporosarcina Pasteurii

Study on the mutual interactions between the parameters of a CANON system and its coping strategy when operating at room temperature (15 to 25 °C) using response surface methodology

2014 ◽  
Vol 69 (9) ◽  
pp. 1805-1812 ◽  
Author(s):  
Jian Zhou ◽  
Guangxu Qin ◽  
Jianbing Zhang ◽  
Yancheng Li ◽  
Qiang He ◽  
...  
Keyword(s):  
Response Surface Methodology ◽  
Response Surface ◽  
Removal Efficiency ◽  
Coping Strategy ◽  
Room Temperature ◽  
Loading Rate ◽  
Nitrogen Loading ◽  
Independent Variables ◽  
Do Concentration ◽  
N Loading

The coping strategy of a CANON (completely autotrophic nitrogen removal over nitrite) reactor working at room temperature was investigated using response surface methodology. The total nitrogen (TN) removal efficiency was taken as a dependent variable. The temperature (X), dissolved oxygen (DO) concentration (Y), and influent nitrogen loading rate (Z) were taken as independent variables. Results showed that the relation of these three independent variables can be described by the TN removal efficiency expressed as −5.03 + 1.51X + 45.16Y + 30.13Z + 0.26XY + 1.84XZ − 0.04X2 − 9.06Y2 − 99.00Z2. The analysis of variance proved that the equation is applicable. The response surface demonstrated that the temperature significantly interacts with the DO concentration and influent N loading rate. A coping strategy for the CANON reactor working at room temperature is thus proposed: altering the DO concentration and the N loading rate to counterbalance the impact of low temperature. The verification test proved the strategy is viable. The TN removal efficiency was 91.3% when the reactor was operated under a temperature of 35.0 °C, a DO of 3.0 mg/L, and a N loading rate of 0.70 kgN/(m³ d). When the temperature dropped from 35.0 to 19.2 °C, the TN removal efficiency was kept at 88.7% by regulating the influent N loading rate from 0.7 kgN/(m³ d) to 0.35 kgN/(m³ d) and the DO concentration from 3.0 to 2.6 mg/L.

scholarly journals Optimization of Operating Parameters of Tig Welding of Incoloy (800ht) through Response Surface Methodology

2020 ◽  
Vol 9 (4) ◽  
pp. 775-784
Keyword(s):  
Tensile Strength ◽  
Response Surface Methodology ◽  
Ultimate Tensile Strength ◽  
Yield Strength ◽  
Response Surface ◽  
Room Temperature ◽  
Input Parameter ◽  
Tig Welding ◽  
Optimum Process ◽  
Grey Relational

In the present study, Response Surface Methodology (RSM) is implemented to determine optimum process variables of TIG welding of Incoly-800HT sheets. Voltage, Welding current and speed of welding are considered as factors. Ultimate tensile strength at room temperature, yield strength at room temperature, ultimate tensile strength at 7500C, yield strength at 7500C and toughness are considered as responses. The Design of Experiment based on central composite response surface design, experimenting is formulated using the Design Expert 12 software. Grey Relational Analysis (GRA) carried on the responses and grey relational coefficients are calculated. The grey relational coefficients are subjected to Principal Component Analysis (PCA) using PAST 3.26 software that transforms the five responses into a single response. The optimization of parameters is carried by Response Surface Methodology and contribution by each input parameter is estimated by ANOVA (Analysis of Variance).

scholarly journals FACTORS AFFECTING REFRIGERATOR-FREEZERS ENERGY CONSUMPTION

2017 ◽  
Vol 19 (2) ◽  
pp. 57-67 ◽  
Author(s):  
R. Saidur Saidur ◽  
H.H. Masjuki ◽  
T.M.I. Mahlia ◽  
A.R. Nasrudin
Keyword(s):  
Mathematical Model ◽  
Response Surface Methodology ◽  
Energy Consumption ◽  
Response Surface ◽  
Room Temperature ◽  
Combined Effect ◽  
Factors Affecting ◽  
Door Opening ◽  
Several Variables ◽  
The Mathematical Model

Two frost-free household refrigerator-freezers, one with 492 liter capacity and one with 460 liter capacity were tested in the laboratory to determine the sensitivity of several variables those influence consumption refrigerator-freezers energy consumption greatly. The effects of single variables such as room temperature, thermostat setting positions, and door openings on the energy  consumption were investigated. Using Response Surface Methodology (RSM), a mathematical model has been developed to investigate the combined effect of room temperature, thermostat setting positions, and door opening on the energy consumption of refrigerator-freezers. From the mathematical model, it has been observed that room-temperature has the highest effect on the energy consumption followed by the thermostat setting position. The door opening has lowest on the energy consumption. More detailed tests were performed under different room temperature, thermostat setting positions, and door opening conditions and presented in this paper.

Characterization and Process Optimization in the Extraction of Gold

2015 ◽  
Vol 1087 ◽  
pp. 236-240
Author(s):  
Pek Ling Ong ◽  
Norlia Baharun ◽  
Suhaina Ismail
Keyword(s):  
Response Surface Methodology ◽  
Optimum Condition ◽  
Response Surface ◽  
Room Temperature ◽  
Statistical Approach ◽  
Fluorescence Analysis ◽  
X Ray ◽  
Steepest Ascent ◽  
Refractory Gold ◽  
Central Composite

Refractory gold ore understudied showed traces amount of gold from X-ray fluorescence analysis. Phases identified are quartz, muscovite and calcite. Statistical approach using response surface methodology - central composite design were performed at varying concentration of NaCN, Pb (NO3)2 and H2O2. Cyanidation experiments were conducted at room temperature at pH 11. Using the response surface methodology followed by path of steepest ascent, gold cyanidation was found to be at 467.3 ppm NaCN, 94.96 ppm Pb (NO3)2 and 0.01M H2O2, at the vicinity towards the optimum condition where 88.97% Au extracted from the ore, equivalent to 1.7231 g/t Au.

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