scholarly journals The Role of Chitosan on Polyvinyl Chloride (PVC)-Glycerol Biocomposites for Blood Bag Application

2018 ◽  
Vol 37 ◽  
pp. 94-106 ◽  
Author(s):  
Nabila Meutia Zahra ◽  
Siswanto ◽  
Prihartini Widiyanti
Keyword(s):  
Tensile Test ◽  
Antibacterial Properties ◽  
Inhibition Zone ◽  
Test Results ◽  
Antibacterial Test ◽  
Chitosan Membrane ◽  
The Common ◽  
Blood Bag ◽  
Test Result

The common blood bag in the market is made from a mixture of PVC and plasticizer. But the a number of occurrences where pockets of heavily polluted bacteria, blood requires blood bags which has the antibacterial characteristic. Antibacterial properties on the bags of blood can be raised with the addition of chitosan. This research aim is to know the influence of chitosan membrane biocomposite PVC-Glycerol against its biological and physical properties. Chitosan dissolved with a concentration of 0 wt/v%; wt/v 0.5%; 1 wt/v%; 1.5 v/wt% wt/v and 2 wt/v% mixed with glycerol with a 1:1 ratio. Then the mixture was mixed with PVC solution 15% and formed into a membrane by using the glass plates. Furthermore, the membranes are characterized using tensile test, hemolytic test, and antibacterial test. The physical characteristics of the tensile test indicate that the elongation percentage was 2.22 – 96.43% and tensile strength was 3.6-8 MPa. The test result of the hemolytic test and antibacterial test showed that biocomposite membrane of PVC-Glycerol-Chitosan are hemocompatible because it has a hemolysis percentage < 5%, while antibacterial test results showed that the membrane has a weak anti-bacterial due to bacterial inhibition zone diameter < 5 mm. Based on the characterization result, biocomposite membrane of PVC-Glycerol-Chitosan can be used for blood bag candidate.

scholarly journals Seroprevalence of SARS-CoV-2 Antibodies in Adults and Healthcare Workers in Southern Italy

2021 ◽  
Vol 18 (9) ◽  
pp. 4761
Author(s):  
Francesco Napolitano ◽  
Gabriella Di Giuseppe ◽  
Maria Vittoria Montemurro ◽  
Anna Maria Molinari ◽  
Giovanna Donnarumma ◽  
...  
Keyword(s):  
Family Member ◽  
Healthcare Workers ◽  
Southern Italy ◽  
Faculty Members ◽  
Italian Population ◽  
Test Results ◽  
The University ◽  
Self Administered Questionnaire ◽  
Test Result

Background: This study was carried out to estimate the seroprevalence of SARS-CoV-2 antibodies in a Southern Italian population. Methods: The study was performed among students and workers of the University of Campania “Luigi Vanvitelli” and the relative Teaching Hospital. Participants were invited to undergo a blood sampling, an interview or to complete a self-administered questionnaire. Results: A total of 140 participants (5.8%) tested positive for SARS-CoV-2 antibodies. Positive SARS-CoV-2 test results increased significantly during the months of testing, and those who had had at least one symptom among fever, cough, dyspnea, loss of taste or smell and who had had contact with a family member/cohabitant with confirmed COVID-19 were more likely to test positive. Faculty members were less likely to have a positive test result compared to the healthcare workers (HCWs). Among HCWs, physicians showed the lowest rate of seroconversion (5.2%) compared to nurses (8.9%) and other categories (10%). Nurses and other HCWs compared to the physicians, those who had had at least one symptom among fever, cough, dyspnea, loss of taste or smell, and who had had contact with a family member/cohabitant with confirmed COVID-19 were more likely to test positive. Conclusions: The results have demonstrated that SARS-CoV-2 infection is rapidly spreading even in Southern Italy and confirm the substantial role of seroprevalence studies for the assessment of SARS-CoV-2 infection circulation and potential for further spreading.

scholarly journals The Role of Prices, Locations, and Promotions on Smartphone Purchase Decisions in Electronics Shop in Indonesia: a Lesson from Sidoarjo

2019 ◽  
Vol 2 (2) ◽  
Author(s):  
Shinta Devi ◽  
Slamet Harjatno
Keyword(s):  
Hypothesis Testing ◽  
Hypothesis Test ◽  
T Test ◽  
Purchase Decisions ◽  
Test Results ◽  
Validity Test ◽  
Simultaneous Test ◽  
A Value ◽  
Test Result

This study aims to determine the effect of price, location and promotion simultaneously and partially to the decision to purchase a smartphone in JH Phone Sidoarjo and to find out the most influential variables on purchasing decision. Hypothesis testing using simultaneous test (F test) and partial test (t test) by using program SPSS version 18.0.The results of research based on Validity Test showed that all research instruments is valid because it has a value of r arithmetic > r table. Based on hypothesis test result showed that the price, location and promotion simultaneously have a significant effect on the decision of purchasing a smartphone in JH Phone Sidoarjo. Hypothesis test results also showed that the price, location and promotion partially have a significant effect on the decision to purchase a smartphone in JH Phone Sidoarjo.

The Role of Prices, Locations, and Promotions on Smartphone Purchase Decisions in Electronics Shop in Indonesia: a Lesson from Sidoarjo

2019 ◽  
Vol 2 (2) ◽  
Author(s):  
Shinta Devi ◽  
Slamet Harjatno
Keyword(s):  
Hypothesis Testing ◽  
Hypothesis Test ◽  
T Test ◽  
Purchase Decisions ◽  
Test Results ◽  
Validity Test ◽  
Simultaneous Test ◽  
A Value ◽  
Test Result

This study aims to determine the effect of price, location and promotion simultaneously and partially to the decision to purchase a smartphone in JH Phone Sidoarjo and to find out the most influential variables on purchasing decision. Hypothesis testing using simultaneous test (F test) and partial test (t test) by using program SPSS version 18.0.The results of research based on Validity Test showed that all research instruments is valid because it has a value of r arithmetic > r table. Based on hypothesis test result showed that the price, location and promotion simultaneously have a significant effect on the decision of purchasing a smartphone in JH Phone Sidoarjo. Hypothesis test results also showed that the price, location and promotion partially have a significant effect on the decision to purchase a smartphone in JH Phone Sidoarjo.

scholarly journals Anisotropy of Mechanical Properties and Residual Stress in Additively Manufactured 316L Specimens

Materials ◽  
2021 ◽  
Vol 14 (23) ◽  
pp. 7176
Author(s):  
Alexey Fedorenko ◽  
Boris Fedulov ◽  
Yulia Kuzminova ◽  
Stanislav Evlashin ◽  
Oleg Staroverov ◽  
...  
Keyword(s):  
Residual Stress ◽  
Tensile Test ◽  
Young’S Modulus ◽  
Young's Modulus ◽  
Mechanical Test ◽  
Test Methods ◽  
Test Results ◽  
Initial Stage ◽  
Anisotropy Of Mechanical Properties

In the presented study, LPBF 316L stainless steel tensile specimens were manufactured in three different orientations for the analysis of anisotropy. The first set of specimens was built vertically on the build platform, and two other sets were oriented horizontally perpendicular to each other. Tensile test results show that mean Young’s modulus of vertically built specimens is significantly less then horizontal ones (158.7 GPa versus 198 GPa), as well as yield strength and elongation. A role of residual stress in a deviation of tensile loading diagrams is investigated as a possible explanation. Simulation of the build process on the basis of ABAQUS FEA software was used to predict residual stress in 316L cylindrical specimens. Virtual tensile test results show that residual stress affects the initial stage of the loading curve with a tendency to reduce apparent Young’s modulus, measured according to standard mechanical test methods.

scholarly journals UJI AKTIVITAS ANTIOKSIDAN DAN ANTIBAKTERI EKSTRAK DAUN Ricinus communis L (JARAK KEPYAR)

Alotrop ◽  
2017 ◽  
Vol 1 (1) ◽  
Author(s):  
Julia Sarfina ◽  
Nurhamidah Nurhamidah ◽  
Dewi Handayani
Keyword(s):  
Antioxidant Activity ◽  
Ethyl Acetate ◽  
Ricinus Communis ◽  
Erwinia Carotovora ◽  
Inhibition Zone ◽  
Ethyl Acetate Fraction ◽  
Test Results ◽  
Leaf Extracts ◽  
Antibacterial Test ◽  
Ricinus Communis L

This study aims to determine the antioxidant activity of jarak kepyar’s  leaf extracts (Ricinus communis L.) and to determine of the fraction the growth of Erwinia carotovora. Jarak kepyar’s leaf extracted by maceration method using ethanol and fractionated using n-hexane and ethyl acetate. Antioxidant test using DPPH (1,1-diphenyl-2-picrylhydrazyl) with various concentrations of 125 ppm, 100 ppm, 75 ppm, 50 ppm, 25 ppm, 15 ppm and 5 ppm. Antibacterial test conducted on the active fractions as antioxidants using paper disc method and variations in the concentration of 1000 ppm, 500 ppm, 250 ppm, 125 ppm, 62.5 ppm. Phytochemical test results jarak kepyar’s leaf contain secondary metabolites are alkaloids, flavonoids, phenols and terpenoids. The test results demonstrate the antioxidant activity of ethyl acetate fraction is very strong as an antioxidant with IC50 values of 5.4 ppm and a strong ethanol fraction categorized as antioxidants IC50 of 99.8 ppm. Antibacterial test results showed inhibition of the leaf fraction of  jarak kepyar’s (Ricinus communis L.) against Erwinia carotovora categorized weak growth in ethanol fractions with inhibition zone diameter of 4 mm and being in ethyl acetate fraction with a diameter of 5 mm

Item Context and /s/ Phone Articulation Test Results

1972 ◽  
Vol 15 (4) ◽  
pp. 852-860 ◽  
Author(s):  
Zoe Zehel ◽  
Ralph L. Shelton ◽  
William B. Arndt ◽  
Virginia Wright ◽  
Mary Elbert
Keyword(s):  
Test Score ◽  
Sound Production ◽  
Broad Context ◽  
Test Results ◽  
Production Task ◽  
Test Result

Fourteen children who misarticulated some phones of the /s/ phoneme were tape recorded articulating several lists of items involving /s/. The lists included the Mc-Donald Deep Test for /s/, three lists similar to McDonald’s but altered in broad context, and an /s/ sound production task. Scores from lists were correlated, compared for differences in means, or both. Item sets determined by immediate context were also compared for differences between means. All lists were found to be significantly correlated. The comparison of means indicated that both broad and immediate context were related to test result. The estimated “omega square” statistic was used to evaluate the percentage of test score variance attributable to context.

On everyday academic research

2017 ◽  
pp. 98-134 ◽  
Author(s):  
J. Tirole
Keyword(s):  
Common Good ◽  
Academic Research ◽  
Research Quality ◽  
Economic Research ◽  
Relevant Research ◽  
The Common ◽  
Verification Of Models ◽  
Science And Research

In the fourth chapter of the book “The economy of the common good”, the nature of economics as a science and research practices in their theoretical and empirical aspects are discussed. The author considers the processes of modeling, empirical verification of models and evaluation of research quality. In addition, the features of economic cognition and the role of mathematics in economic research are analyzed, including the example of relevant research in game theory and information theory.

Contemplative Principles of a Non-dual Praxis: the Unmediated Practices of the Tibetan ‘Heart Essence’ (sNying thig) Tradition

2015 ◽  
Vol 31 (2) ◽  
pp. 215-240
Author(s):  
Eran Laish
Keyword(s):  
Contemplative Practice ◽  
Tibetan Buddhist ◽  
Buddhist Tradition ◽  
The Common

This article focuses on the main contemplative principles of the ‘Heart Essence’ (sNying thig), a Tibetan Buddhist tradition that is characterized by a vision of non-duality and primordial wholeness. Due to this vision, which asserts an original reality that is not divided into perceiving subject and perceived object, the ‘Heart Essence’ advocates a contemplative practice that undermines the usual intuitions of temporality and enclosed selfhood. Hence, unlike the common principles of intentional praxis, such as deliberate concentration and gradual purification, the ‘Heart Essence’ affirms four contemplative principles of non-objectiveness, openness, spontaneity and singleness. As these principles transcend intentionality, temporality, and multiplicity, they are seen to directly disclose the nature of primordial awareness, in which the meanings of knowing and being are radically transformed. Therefore, the article will also consider the role of these non-dual contemplative principles in deeply changing our understanding of being and knowing alike.

Charles de Gaulle and European Community

2020 ◽  
Vol 2020 (10-3) ◽  
pp. 70-81
Author(s):  
David Ramiro Troitino ◽  
Tanel Kerikmae ◽  
Olga Shumilo
Keyword(s):  
World War Ii ◽  
European Community ◽  
World War ◽  
Charles De Gaulle ◽  
The United Kingdom ◽  
History Of ◽  
The Common ◽  
Post War ◽  
De Gaulle

This article highlights the role of Charles de Gaulle in the history of united post-war Europe, his approaches to the internal and foreign French policies, also vetoing the membership of the United Kingdom in the European Community. The authors describe the emergence of De Gaulle as a politician, his uneasy relationship with Roosevelt and Churchill during World War II, also the roots of developing a “nationalistic” approach to regional policy after the end of the war. The article also considers the emergence of the Common Agricultural Policy (hereinafter - CAP), one of Charles de Gaulle’s biggest achievements in foreign policy, and the reasons for the Fouchet Plan defeat.

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