Blend uniformity evaluation during continuous mixing in a twin screw granulator by in-line NIR using a moving F-test

2016 ◽  
Vol 935 ◽  
pp. 213-223 ◽  
Author(s):  
Margot Fonteyne ◽  
Jurgen Vercruysse ◽  
Fien De Leersnyder ◽  
Rut Besseling ◽  
Ad Gerich ◽  
...  
Keyword(s):  
F Test ◽  
Continuous Mixing ◽  
Blend Uniformity ◽  
Twin Screw

scholarly journals Effect of agitation on the efficiency of enzymatic hydrolysis of highly concentrated media of extruded corn starch

2020 ◽  
Vol 82 (3) ◽  
pp. 96-103
Author(s):  
A. Y. Sharikov ◽  
V. V. Ivanov ◽  
M. V. Amelyakina
Keyword(s):  
Dynamic Viscosity ◽  
Corn Starch ◽  
Degree Of Hydrolysis ◽  
Screw Extruder ◽  
Enzyme Preparations ◽  
Continuous Mixing ◽  
Dextrose Equivalent ◽  
Twin Screw ◽  
High Degree ◽  
Hydrolysis Of

The influence of the mixing factor and its intensity was investigated at the stage of developing a technology for processing highly concentrated hydrolysates (50% solids) of extruded corn starch. The starch was extruded using a twin-screw extruder at a temperature of 185 °C and a pressure at the die of 2 MPa. Extruded substrate was hydrolyzed with enzyme preparations of ?-amylase and glucoamylase for 4 hours with different stirring modes. The significance of the stirring speed on the degree of hydrolysis of extruded starch, especially in the first 2 hours of enzymatic treatment, has been established. As a result of 4-hour exposure, the dextrose equivalent of the hydrolyzate incubated without stirring was 52.2. Dextrose equivalent of the hydrolysates stirred at speed of 100, 200 and 500 rpm was 54.5, 59.3, and 59.8, respectively. The study of rheological properties showed that the dynamic viscosity of a medium without stirring significantly differed from the viscosity of a medium with stirring throughout the entire hydrolysis period. As a result, the dynamic viscosity of the sample without stirring and with stirring decreased from 3 Pa?s to 0.35 Pa?s and from 2.5-2.8 Pa?s to 0.145-0.221 Pa?s, respectively. An double increase of the glucoamylase dosage made the mixing factor after 4 hours of hydrolysis insignificant and increased the dextrose equivalent value by 18-35%. The dextrose equivalents of samples without stirring and with stirring at a frequency of 200 rpm were 70 and 71, respectively. But in the first 2 hours of hydrolysis, the stirring factor for samples with an increased dosage of glucoamylase was also statistically significant. The study showed that hydrolysis of highly concentrated media of extruded starch under the condition of high-quality homogenization with the enzymes provides a high degree of bioconversion without the requirement for continuous mixing,

An efficient, maintenance free and approved method for spectroscopic control and monitoring of blend uniformity: The moving F-test

2015 ◽  
Vol 114 ◽  
pp. 471-481 ◽  
Author(s):  
Rut Besseling ◽  
Michiel Damen ◽  
Thanh Tran ◽  
Thanh Nguyen ◽  
Kaspar van den Dries ◽  
...  
Keyword(s):  
F Test ◽  
Blend Uniformity

Determination of the phase structure of polymerblends by electron microscopy

1978 ◽  
Vol 36 (1) ◽  
pp. 492-493
Author(s):  
Dr. G. Kaemof
Keyword(s):  
Screw Extruder ◽  
Electron Microscopic ◽  
Thin Sections ◽  
Single Screw Extruder ◽  
Transmission Electron ◽  
The Matrix ◽  
Twin Screw ◽  
Special Case ◽  
Microscopic Investigations

A mixture of polycarbonate (PC) and styrene-acrylonitrile-copolymer (SAN) represents a very good example for the efficiency of electron microscopic investigations concerning the determination of optimum production procedures for high grade product properties.The following parameters have been varied:components of charge (PC : SAN 50 : 50, 60 : 40, 70 : 30), kind of compounding machine (single screw extruder, twin screw extruder, discontinuous kneader), mass-temperature (lowest and highest possible temperature).The transmission electron microscopic investigations (TEM) were carried out on ultra thin sections, the PC-phase of which was selectively etched by triethylamine.The phase transition (matrix to disperse phase) does not occur - as might be expected - at a PC to SAN ratio of 50 : 50, but at a ratio of 65 : 35. Our results show that the matrix is preferably formed by the components with the lower melting viscosity (in this special case SAN), even at concentrations of less than 50 %.

Ein nicht-parametrischer Zweistichproben-F-Test auf Randomisierungsbasis

1969 ◽  
Vol 08 (04) ◽  
pp. 215-219
Author(s):  
G. A. Lienert ◽  
H. Schulz
Keyword(s):  
Wird Eine ◽  
F Test

Es wird eine Übersicht über derzeit verfügbare verteilungsfreie Dispersionstests gegeben. Da bisher noch kein voll effizienter Zwei-Stichproben-Dispersionstest auf Randomisierungsbasis — entsprechend dem Randomisierungstest von Fisher für Lokationsunterschiede —• vorliegt, wurde ein solcher entwikkelt und an einem Beispiel demonstriert.Das Rationale beruht darauf, daß die Meßwerte eines Zwei-Stichproben-Vergleiches — nach den Regeln der Kombinatorik — in allen möglichen Kombinationen angeordnet werden und für jede Kombination der zugehörige Varianzquotient (F-Bruch) berechnet wird. Auf diese Weise erhält man eine stichprobenspezifische Prüfverteilung. Die Prüfgröße ergibt sich aus der Zahl der F-Werte, die den beobachteten F-Wert erreichen oder übersteigen. Die Alternativhypothese kann einoder zweiseitig formuliert werden.Vorteile des Tests: Er spricht nur auf Unterschiede der Dispersion zweier Stichproben an, und seine relative asymptotische Effizienz ist gleich eins. Nachteilig wirkt sich der erhebliche Rechenaufwand aus, wenn keine Rechenanlage zur Verfügung steht.

Faktor-Faktor Yang Mempengaruhi Keputusan Mahasiswa Memilih Program Studi Kebidanan STIKES Muhammadiyah Ciamis Tahun 2016

2018 ◽  
Vol 5 (1) ◽  
pp. 69-82
Author(s):  
Evi Mariana
Keyword(s):  
Data Analysis ◽  
Linear Regression ◽  
Multiple Linear Regression ◽  
Random Sampling ◽  
Sampling Method ◽  
Marketing Mix ◽  
Stratified Random Sampling ◽  
Price Promotion ◽  
F Test ◽  
Physical Evidence

The purpose of this study was to analyze the factors that influence the decisionof the students chose to study in Obstetrics Prodi STIKES Muhammadiyah Ciamis and analyze the factors that most influence the decision of the students chose to study in Obstetrics Prodi STIKES Muhammadiyah Ciamis. Collecting data in this study was conducted using a survey by questionnaire to 114 students by stratified random sampling method. Methods of data analysis using multiple linear regression, F test and test T. The result is a marketing mix that significantly is the product, place, and physical evidence. And that does not affect the marketing mix is price, promotion, place, and processes

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