scholarly journals Multiple response optimization of the effect of thyme essential oil against Listeria monocytogenes in ground meat at different times and temperatures

2016 ◽  
Vol 72 (7) ◽  
pp. 435-447
Author(s):  
Fatih Tornuk ◽  
Mustafa Tahsin Yilmaz ◽  
Ismet Ozturk ◽  
Osman Sagdic ◽  
Muhammet Arici ◽  
...  
Keyword(s):  
Storage Temperature ◽  
Desirability Function ◽  
Linear Regression Analysis ◽  
Multiple Linear Regression Analysis ◽  
Response Surfaces ◽  
Operating Conditions ◽  
Optimum Operating ◽  
Ground Meat ◽  
Combined Model ◽  
And Storage

Response surface methodology was used to optimize conditions (e.g., Thyme oil concentration [0.0–0.57%] and storage temperature [0.0-14.14ºC]) for inhibiting the growth of L. monocytogenes (log cfu/g) in ground meat. Additionally, the effect of the variables; namely, temperature and concentration on µmax (maximum specific growth rate, ln cfu/g/h) values was also evaluated using a proposed combined model. The best fitting second order polynomial models were developed for each response using multiple linear regression analysis with backward elimination regression (BER) procedure. In this paper, multi-response surfaces using desirability function approaches were successfully applied to determine optimum operating conditions. Under these optimum treatment and storage parameters, L. monocytogenes populations at hours 6, 24, 48, 72 and 96 were 6.12, 5.96, 5.88, 5.81 and 5.41 log cfu/g and 0.001 ln cfu/g/h, respectively and μmax value 0.001 ln cfu/g/h. At the end, the proposed combined model is described numerically and experimentally.

scholarly journals Optimization of osmotic dehydration process for Oyster mushrooms (Pleurotus sajor-caju) in sodium chloride solution using RSM

2014 ◽  
Vol 6 (1) ◽  
pp. 152-158 ◽  
Author(s):  
H. G. Ramya ◽  
Satish Kumar ◽  
Shammi Kapoor
Keyword(s):  
Sodium Chloride ◽  
Osmotic Dehydration ◽  
Linear Regression Analysis ◽  
Response Surfaces ◽  
Operating Conditions ◽  
Solution Temperature ◽  
Optimum Operating ◽  
Process Variables ◽  
Oyster Mushrooms ◽  
Pleurotus Sajor Caju

Sodium chloride (NaCl) and water transfer were quantitatively investigated during osmotic dehydration of Oyster mushrooms (Pleurotus sajor-caju) using response surface methodology with the NaCl concentration (10– 20%, w/v), solution temperature (30–60° C) immersio n time (15–240 min) and solution to fruit ratio (4:1 to 8:1) were taken as independent process variables. Experiments were conducted in a thermostatically controlled agitating incubator. For each response, second order polynomial models were developed using multiple linear regression analysis. Analysis of variance (ANOVA) was performed to check the adequacy and accuracy of the fitted models. The response surfaces and contour maps showing the interaction of process variables were constructed. Applying desirability function method, the optimum operating conditions were found to be: solution temperature – 45o C, immersion time – 53.54 min, salt concentration – 14.09% and solution to fruit ratio 6.08:1. Corresponding to these optimum values water loss, solute gain and weight reduction were 38.13, 2.1 and 36.02 (g/100 g initial mass) respectively.

Effects of (Pre-)analytical Variables on Activated Protein C Resistance Determined Via a Thrombin Generation-based Assay

2002 ◽  
Vol 87 (03) ◽  
pp. 483-492 ◽  
Author(s):  
Joyce Curvers ◽  
M. Christella ◽  
G. D. L. Thomassen ◽  
Hans de Ronde ◽  
Rogier Bertina ◽  
...  
Keyword(s):  
Tissue Factor ◽  
Protein C ◽  
Storage Temperature ◽  
Linear Regression Analysis ◽  
Activated Protein C ◽  
Multiple Linear Regression Analysis ◽  
Apc Resistance ◽  
Sensitivity Ratio ◽  
Normal Individuals ◽  
Thrombin Formation

SummaryThe normalized activated protein C sensitivity ratio (nAPC-sr) determined with an assay that quantifies the effect of APC on thrombin formation initiated via the extrinsic coagulation pathway identifies hereditary and acquired defects of the protein C system. We investigated the influence of assay conditions (analytical variables) and plasma handling (pre-analytical variables) on nAPC-sr obtained with this APC resistance test. The effect of the analytical variables (CaCl2, phospholipid and APC concentrations and the concentration and source of tissue factor) was determined in pooled normal plasma. Inhibition of thrombin formation by APC was dependent on the APC concentration and was also affected by the tissue factor, Ca2+ and phospholipid concentrations. Thus, strict standardization of reactant concentrations is required to obtain reproducible nAPC-sr. Three different tissue factor preparations were compared by determining nAPCsr in plasma samples obtained from 90 healthy individuals. nAPC-sr were similar for all three tissue factor preparations although, compared with the noncommercially available tissue factor used in earlier studies, values determined with commercial tissue factor preparations showed larger variation. Pre-analytical variables, investigated in plasma of nine volunteers (3 normal individuals and 6 individuals with an APCresistant phenotype) were: concentration of anticoagulant (3.2% vs. 3.8% trisodiumcitrate), time before processing of blood (0, 4 and 24 h), centrifugation speed, storage temperature of plasma (–20° C vs. –80° C) and sample thawing. Multiple linear regression analysis showed that only the citrate concentration affected the nAPC-sr, which was higher in samples collected in 3.2% trisodiumcitrate than in samples collected in 3.8% trisodiumcitrate.

scholarly journals Performance Analysis of the Perhydro-Dibenzyl-Toluene Dehydrogenation System—A Simulation Study

2021 ◽  
Vol 13 (11) ◽  
pp. 6490
Author(s):  
Farea Asif ◽  
Muhammad Haris Hamayun ◽  
Murid Hussain ◽  
Arif Hussain ◽  
Ibrahim M. Maafa ◽  
...  
Keyword(s):  
Exergy Analysis ◽  
Process Integration ◽  
Operating Conditions ◽  
Energy Resources ◽  
Optimum Operating ◽  
Operational Conditions ◽  
Aspen Hysys ◽  
System A ◽  
Analysis Strategy ◽  
And Storage

The depletion of conventional energy resources has drawn the world’s attention towards the use of alternate energy resources, which are not only efficient but sustainable as well. For this purpose, hydrogen is considered the fuel of the future. Liquid organic hydrogen carriers (LOHCs) have proved themselves as a potential option for the release and storage of hydrogen. The present study is aimed to analyze the performance of the perhydro-dibenzyl-toluene (PDBT) dehydrogenation system, for the release of hydrogen, under various operational conditions, i.e., temperature range of 270–320 °C, pressure range of 1–3 bar, and various platinum/palladium-based catalysts. For the operational system, the optimum operating conditions selected are 320 °C and 2 bar, and 2 wt. % Pt/Al2O3 as a suitable catalyst. The configuration is analyzed based on exergy analysis i.e., % exergy efficiency, and exergy destruction rate (kW), and two optimization strategies are developed using principles of process integration. Based on exergy analysis, strategy # 2, where the product’s heat is utilized to preheat the feed, and utilities consumption is minimized, is selected as the most suitable option for the dehydrogenation system. The process is simulated and optimized using Aspen HYSYS® V10.

scholarly journals Optimization of Phenolics and Flavonoids Extraction Conditions and Antioxidant Activity of Roasted Yerba-Mate Leaves (Ilex paraguariensis A. St.-Hil., Aquifoliaceae) using Response Surface Methodology

2014 ◽  
Vol 86 (2) ◽  
pp. 923-934 ◽  
Author(s):  
DÉBORA C. BASSANI ◽  
DOMINGOS S. NUNES ◽  
DANIEL GRANATO
Keyword(s):  
Antioxidant Activity ◽  
Response Surface Methodology ◽  
Response Surface ◽  
Desirability Function ◽  
Operating Conditions ◽  
Optimum Operating ◽  
Ilex Paraguariensis ◽  
Yerba Mate ◽  
Experimental Conditions ◽  
Highly Correlated

This study focused on maximizing the extraction of total phenolics and flavonoids as well as the antioxidant activity measured by the 1,1-diphenyl-2-picrylhydrazyl (DPPH) assay from roasted yerba mate (Ilex paraguariensis) as a function of time (5, 7.5 and 10 min) and temperature of extraction (60, 75 and 90°C). The data were subjected to Response Surface Methodology and the results showed that polynomial equations were significant, did not present lack of fit, and presented adjusted determination coefficients above 98%, proving their suitability for prediction purposes. Using the desirability function, the optimum operating conditions to obtain a higher extraction of antioxidants was found to be 10 min of extraction at 90°C, and the tea prepared under these experimental conditions presented 427.74 mg of gallic acid equivalents per liter and 80.02% of inhibition of the DPPH radical. The flavonoid content was highly correlated (r = 0.9046, p < 0.001) to the antioxidant capacity.

Optimization of Storage Conditions of Malta (Citrus sinensis) Using Response Surface Methodology

2016 ◽  
Vol 12 (5) ◽  
pp. 507-514 ◽  
Author(s):  
Rishi Richa ◽  
J.P. Pandey ◽  
N.C. Shahi ◽  
S.S. Kautkar
Keyword(s):  
Response Surface Methodology ◽  
Response Surface ◽  
Desirability Function ◽  
Minimum Weight ◽  
Linear Regression Analysis ◽  
Multiple Linear Regression Analysis ◽  
Storage Conditions ◽  
Box Behnken Design ◽  
Order Polynomial ◽  
Soluble Solid

Abstract Response surface methodology was used to determine the optimum storage conditions of malta fruits that give minimum weight loss and maximum total soluble solid (TSS) retained value. Scavenger (3–5 g), polythene thickness (75–125 gauge) and fungicide concentration (75–200 ppm) were the factors investigated. Experiments were designed according to Box–Behnken design with these three factors, including central points. For each response, a second-order polynomial model was developed using multiple linear regression analysis. Applying desirability function method, optimum storage conditions were found to be 5 g scavenger, 125 gauge polythene thickness and 200 ppm fungicide concentration.

Pengaruh Motivasi Kerja Dan Lingkungan Kerja Terhadap Kinerja Karyawan Bappeda Kabupaten Wonosobo Tahun 2013

2017 ◽  
Vol 1 (2) ◽  
pp. 135-147
Author(s):  
Ary Sutrischastini ◽  
Ratna Setyani
Keyword(s):  
Work Environment ◽  
Work Motivation ◽  
Employee Performance ◽  
Linear Regression Analysis ◽  
Test Validity ◽  
Multiple Linear Regression Analysis ◽  
Reliability Testing ◽  
Evaluation Influence ◽  
Environment Variables ◽  
Research Goal

This research goal is to identification and evaluation influence of work motivation and work environment to employee’s performance in BAPPEDA Kabupaten Wonosobo. The object of this research is 37 employees of Badan Perencanaan Pembangunan Kabupaten Wonosobo. And the location of this research is at Badan Perencanaan Pembangunan Kabupaten Wonosobo. The analysis used is test validity, reliability testing, and test the hypothesis, with the help of the computer program SPSS version 17, using multiple linear regression analysis. Based on calculations of data and analysis used, the regression equation is obtained: Y = 11.733 + 0.320 X1 +0.334 X2 + ε, by using the equation regression analytical method can conclude that (X1) take effect positively against employees performance. With t value in amount of 2,219 (bigger than t in table in amount of 1,690) and significance value in amount of 0,33. By applying significance limited value in amount of 0,05, it means, hypothesis that claim if work motivation take effect against employees performance can be accepted. There is a positive and significant correlation between work environment variables (X2) against employees. With t value in amount of 2,219 (bigger than t in table in amount of 1,690) and significance value in amount of 0,33 (smaller than 0,5). Simultaneously, work motivation take effect positively and significantly against employees performance with the F value in amount of 11,562 (bigger than 0.05), then obtained significance value 0.000. It can be concluded that the work motivation and work environment has a positive and significant influence on employee performance in BAPPEDA Kabupaten Wonosobo.

PENGARUH FAKTOR-FAKTOR INTERNAL PERBANKAN TERHADAP NON PERFORMING FINANCING PADA BANK UMUM SYARIAH

2019 ◽  
Vol 6 (2) ◽  
pp. 115-130
Author(s):  
Eka Ambara Harci Putranta ◽  
Lilik Ambarwati
Keyword(s):  
Linear Regression ◽  
Multiple Linear Regression ◽  
Linear Regression Analysis ◽  
Multiple Linear Regression Analysis ◽  
Capital Adequacy ◽  
Annual Reports ◽  
Regression Methods ◽  
Capital Adequacy Ratio ◽  
Negative Effect ◽  
Independent Variable

The study aims to analyze the influence of internal banking factors in the form of: Capital Adequency Ratio (CAR), Financing to Deposit Ratio (FDR) and Total Assets (TA) to Non Performing Financing at Sharia Banks. This research method used multiple linear regression analysis with the help of SPSS 16.00 software which is used to see the influence between the independent variables in the form of Capital Adequacy Ratio (CAR), Financing to Deposit Ratio (FDR) and Total Assets (TA) to Non Performing Financing. The sample of this study was 3 Islamic Commercial Banks, so there were 36 annual reports obtained through purposive sampling, then analyzed using multiple linear regression methods. The results showed that based on the F Test, the independent variable had an effect on the NPF, indicated by the F value of 17,016 and significance of 0,000, overall the independent variable was able to explain the effect of 69.60%. While based on the partial t test, showed that CAR has a significant negative effect, Total assets have a significant positive effect with a significance value below 0.05 (5%). Meanwhile FDR does not affect NPF.

PENGARUH TRANSPARANSI PENGELOLAAN KEUANGAN DANA DESA DAN PEMBERDAYAAN MASYARAKAT TERHADAP KESEJAHTERAAN MASYARAKAT DESA SIDOHARJO

2020 ◽  
Vol 28 (1) ◽  
pp. 35-50
Author(s):  
Dewi Kusuma Wardani ◽  
Ratih Ranika Putri Utami
Keyword(s):  
Financial Management ◽  
Linear Regression Analysis ◽  
Sampling Technique ◽  
Multiple Linear Regression Analysis ◽  
Community Empowerment ◽  
Primary Data ◽  
Community Members ◽  
The People ◽  
Quantitative Descriptive ◽  
Positive Effect

This study aims to determine the effect of transparency in financial management of village funds and community empowerment on community welfare in Sidoharjo Village, Tepus District, Gunungkidul Regency. This research method uses quantitative descriptive methods and primary data using questionnaires. This study took a sample of residents who were divided into 11 hamlets in Sidoharjo Village, Tepus District, Gunung kidul Regency. The sampling technique is stratified random sampling. Data collection is done by distributing questionnaires directly to people’s homes, attending social gatherings and routine meetings held by community members. It aims to obtain more data from respondents directly. The number of questionnaires processed was 120 questionnaires. Data were analyzed using multiple linear regression analysis. The results of this study indicate that community empowerment has a positive effect on the welfare of the people of Sidoharjo Village, Tepus District, Gunungkidul Regency, while transparency in financial management of village funds does not affect the welfare of the community in Sidoharjo Village, Tepus District, Gunungkidul Regency.

Pengaruh Tekanan Waktu, Locus Of Control , Tindakan Supervisi, Dan Materialitas Terhadap Penghentian Prematur Atas Prosedur Audit Studi Kasus Pada Kantor Akuntan Publik Daerah Istimewa Yogyakarta Tahun 2015

2017 ◽  
Vol 24 (1) ◽  
pp. 35-53
Author(s):  
Sulastiningsih Sulastiningsih ◽  
Intan Ayu Candra
Keyword(s):  
Locus Of Control ◽  
Premature Termination ◽  
Sampling Methods ◽  
Time Pressure ◽  
Linear Regression Analysis ◽  
Multiple Linear Regression Analysis ◽  
Test Reliability ◽  
Friedman Test ◽  
Independent Variables ◽  
Public Accountant

The purpose of this study is to prove: (1) Time pressure, locus of control, the action of supervision and materiality partially affect the premature termination of the audit procedures (2) Time pressure, locus of control, supervision and materiality simultaneously affect the premature termination on the audit procedures. This research was conducted in Public Accountant firm in Yogyakarta region of which total 12 samples of KAP, by distributing 105 questionnaires, and 57 questionnaires were returned (54%). 34 of the returned questionnaires can be processed (34%). The samples in this study were determined by using non-probability sampling, one of purposive sampling methods. Data analysis consisted of: (1) validity test, reliability test and classical assumption. The result showed that the instruments used are quite reliable and valid (2) multiple linear regression analysis. The results are (a) Some of independent variables partially affect premature termination of the audit procedure, while the action of supervision does not influence premature termination of audit procedures (b) All independent variables influence simultaneously to the premature termination of the audit procedures (c) All independent variables showed that as much as 55% it affects on premature termination of the audit procedures, the rest of it are influenced by other variables. (3) Friedman Test. The result shows that there are order of priority of audit procedures being terminated.

Pengaruh Tingkat Literasi Keuangan Syariah dan Kepercayaan Masyarakat terhadap Minat Menabung di Bank Syariah

2020 ◽  
Vol 3 (2) ◽  
pp. 140-153
Author(s):  
Resti Fadhilah Nurrohmah ◽  
Radia Purbayati
Keyword(s):  
Financial Literacy ◽  
Linear Regression Analysis ◽  
Public Trust ◽  
Multiple Linear Regression Analysis ◽  
Primary Data ◽  
Public Confidence ◽  
Islamic Banks ◽  
Variable Level ◽  
Analysis Technique ◽  
The City

The purpose of this study was to study the level of Islamic financial literacy and public confidence in the interest in saving in Islamic banks. The variables in this study are the level of Islamic financial literacy (X1), public trust (X2), and interest in saving (Y).The method of this study is descriptive quantitative approach. The data source of this study are primary data obtained by distributing questionnaires. Respondents taken are residents in the city of Bandung, with samples domiciled in the city of Bandung and at least 17 years old. The data analysis technique uses multiple linear regression analysis. The results showed that the variable level of islamic financial literacy and public trust has positive effect in the interest in saving in Islamic banks. The findings in this study provide a reference to Islamic banks, the level of literacy and public trust regarding interest in saving, therefore Islamic banks must socialize to the public.

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