نتایج جستجو برای: central composite rotatable design
تعداد نتایج: 1501192 فیلتر نتایج به سال:
Despite having remarkable features such as low density, ease of fabrication and recyclability, linear low-density polyethylene (LLDPE) has several drawbacks like poor stiffness creep resistance which fortunately can be improved by incorporating with other suitable nanofillers. In this study, graphene nanoplatelets (GNPs) that are well-known for its high surface area superior stability were sele...
A statistically based Plackett-Burman screening design identified milk whey and corn steep liquor concentrations as well as ionic strength (based on phosphate buffer concentration) as the three main independent components of the culture medium that significantly (p < 0.05) influenced biomass and poly(3-hydroxybutyrate) (PHB) production in recombinant cells of Escherichia coli. This strain carri...
The vegetal species Arachis repens, commonly known as peanut grass, was studied and, for the first time, we detected the presence of the bioactive compound trans-resveratrol (t-RSV). We compared the efficiency of three different methodologies (conventional maceration [CM], ultrasound-assisted extractions [UAE], and microwave-assisted extractions [MAE]) concerning total phenolics (TP) and resver...
The aim of this study was to understand and investigate the relationship between experimental factors and their responses in the preparation of ciprofloxacin hydrochloride based solid lipid nanoparticles. A quadratic relationship was studied by developing central composite rotatable design. Amount of lipid and drug, stirring speed and stirring time were selected as experimental factors while pa...
Enzymatic degumming (EDG) is an emerging alternative process for decreasing the phosphorus content, increasing oil yield, and preserving quality. Purifine® 3G a cocktail of phospholipases composed phospholipase A2 (PLA2), C (PLC), phosphatidylinositol (PI-PLC). In this study, was applied to crude soybean oil, optimum conditions (enzyme concentration, temperature, water dosage) were determined u...
Non-catalytic hydrogenation of liquid natural rubber (LNR) via thermal decomposition 2,4,6-trimethylbenzenesulfonylhydrazide (MSH) is reported in this study. Parameter studies the reaction were performed by utilizing combination response surface methodology and central composite rotatable design (RSM/CCRD). The effects each variable interaction between two variables (i.e. MSH:LNR weight ratio t...
Fluorine is released into the water environment naturally or by anthropogenic activities. promotes health benefits at low concentrations, but it adverse effects ranging from fluorosis to carcinogenic problems high concentrations. Although fluorine removal can occur through processes such as adsorption, reverse osmosis, and electrodialysis, phytoremediation emerges an accessible environmentally ...
Optimizing the working performance of cutting device for harvesting Chinese little greens is crucial to reducing energy consumption in and improving quality. To explore mechanical characteristics leafy vegetables cutting, dynamic process with a cutter was simulated numerically by using finite element method based on theoretical analysis. In numerical simulation, response-surface methodology (RS...
A central composite rotatable design with four independent variables viz. blend ratio (broken rice flour and cowpea flour): 90:10–70:30, moisture content (10–18% wet basis), barrel temperature (110–150 °C), screw speed (280–360 rpm) were varied in the development of ready-to-eat snacks using a twin extruder for broken rice–cowpea product. The effects on specific mechanical energy, water absorpt...
Tool wear increases cutting force, vibration, temperature, etc in end milling and reduces surface finish of the machined work piece. Mathematical model has been developed to predict the tool wear in terms of machining parameters such as helix angle of cutting tool, spindle speed, feed rate, axial and radial depth of cut. Central composite rotatable second order response surface methodology was ...
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