scholarly journals Analysis of the influence of surface roughness of various types of wood on the results of their hardness measured by the Leeb method

2021 ◽  
Vol 1199 (1) ◽  
pp. 012071
Author(s):  
M Bembenek ◽  
Ł. Kowalski ◽  
J. Pawlik
Keyword(s):  
Surface Roughness ◽  
Tree Species ◽  
Hardness Test ◽  
Hardness Measurement ◽  
Test Results ◽  
Before And After ◽  
Leeb Hardness ◽  
The Impact ◽  
Impact Mass ◽  
Measured Hardness

Abstract Determining the hardness in the Leeb scale consists in measuring the velocity of the impact mass before and after hitting the sample. The result is the speed of the impactor shall after the rebound divided by the speed before the rebound (multiplied by 1000). The measured hardness ranges from 0 to 1000 and is largely dependent on the Young's modulus of elasticity. The article presents the Leeb hardness measurement tests of six various species of wood. The samples were machining before testing in such a way that there were places with different surface roughness on its surface. The research showed the differentiation of the hardness test results for the same tree species depending on the roughness of the surface

scholarly journals Automatic Refactoring of Java Code Using the Stream API

2019 ◽  
Vol 17 (2) ◽  
pp. 49-60
Author(s):  
R. A. Ivanov ◽  
T. F. Valeev
Keyword(s):  
Software Tool ◽  
Test Results ◽  
Correct Operation ◽  
Java Programming ◽  
Java Language ◽  
Code Base ◽  
Before And After ◽  
Long Time ◽  
The Impact ◽  
Java Code

For a long time, functional Java programming was not possible. However, lambda expressions appeared in version 8 of the Java language. Due to the support of standard library classes (Stream, Optional, etc.) in Java, it became possible to describe transformations over data in a functional style. Java is a rather old language with a large imperative code base written in it. In order to take advantage of the new approach, it is necessary to perform a non-trivial refactoring, which can be very tedious and error prone when applied manually. Fortunately, for a sufficiently large number of situations, this refactoring can be safely performed automatically. Using IntelliJ Idea as a platform software tool was developed that allows you to find places where it is possible to automatically convert an imperative code to an equivalent code that uses Stream API, as well as an automatic fix that allows you to make a replacement. Refactoring uses IntelliJ Idea framework to analyze Java code, and integrates into the IDE itself. One of the main criteria for the correct operation of the algorithm is the security of this transformation. The user cannot trust the tool if the transformation can change the semantics of the code. This article discusses various constraints that are imposed on code patterns so that transformation without distortion of semantics is possible. Refactoring has been tested in various libraries to verify the semantics are preserved by checking the test results before and after applying refactoring. This article will not describe the impact of using the Stream API on the performance of the application.

scholarly journals Solving Fractions by Applying the Bar Model Concept with the Butterfly Method

2020 ◽  
Vol 14 (2) ◽  
pp. 101-116
Author(s):  
Jessica Low ◽  
Masitah Shahrill ◽  
Nordiana Zakir
Keyword(s):  
Test Results ◽  
Model Concept ◽  
Brunei Darussalam ◽  
Whole Number ◽  
Before And After ◽  
Post Test ◽  
The Government ◽  
Teaching Fractions ◽  
The Impact ◽  
Method Approach

This study aims to investigate an intervention in the application of the Butterfly Method Algorithm with the Bar Model Concept on the addition and subtractions of Fractions to Year 9 students in one of the Government secondary schools in Brunei Darussalam. The Butterfly Method is an alternative visual method for teaching fractions where the diagonal and horizontal multiplication of the denominators and numerators are employed by drawing the Butterfly. A mixed-method approach was used to explore the impact of the intervention with data gathered from the students’ written pre- and post-tests and interview transcripts. The tests conducted before and after the intervention were used to analyze students’ errors and misconceptions. The students’ written analyses of the post-test results revealed that not all of the students applied the Butterfly Method. A few students were selected for interviews in order to gain deeper insights into how they developed the errors and misconceptions from both tests. Findings from the students’ interview transcripts revealed they were not confident with the Butterfly Method, and they needed more time to be familiar with the concept. Another factor for not applying the Butterfly Method is due to students’ confusion on subtracting fractions that has the same denominators as well as subtracting a proper fraction from a whole number. This study concluded that students who applied the Butterfly Method helped them to remember the new method from the intervention satisfactorily in comparison to those who lack the confidence in applying it.

scholarly journals Performance of Professional Soccer Players before and after COVID-19 Infection; Observational Study with an Emphasis on Graduated Return to Play

2021 ◽  
Vol 18 (21) ◽  
pp. 11688
Author(s):  
Anamarija Jurcev Savicevic ◽  
Jasna Nincevic ◽  
Sime Versic ◽  
Sarah Cuschieri ◽  
Ante Bandalovic ◽  
...  
Keyword(s):  
High Intensity ◽  
Total Sample ◽  
Return To Play ◽  
Soccer Players ◽  
Test Results ◽  
Professional Soccer ◽  
Before And After ◽  
Moderate Effect Size ◽  
The Impact ◽  
Pcr Test

The impact of the COVID-19 pandemic in sport has been the subject of numerous studies over the past two years. However, knowledge about the direct impact of COVID-19 infection on the performance of athletes is limited, and the importance of studies on this topic is crucial during the current pandemic era. This study aimed to evaluate the changes in the match running performance (MRP) of professional soccer players that occurred as a result of COVID-19 infection after fulfilling all of the prerequisites for a safe return to play (RTP). The participants were 47 professional soccer players from a team which competed in first Croatian division (21.6 years old on average) during the 2020/21 season. The total sample was divided into two subgroups based on the results of a PCR test for COVID-19, where 31 players tested positive (infected) and 16 tested negative. We observed the PCR test results (positive vs. negative PCR), the number of days needed to return to the team, number of days needed to RTP after quarantine and isolation, and MRP (10 variables measured by a global positioning system). The number of days where the infected players were not included in the team ranged from 7 to 51 (Median: 12). Significant pre- to post-COVID differences in MRP for infected players were only found for high-intensity accelerations and high-intensity decelerations (t-test = 2.11 and 2.13, respectively; p < 0.05, moderate effect size differences), with poorer performance in the post-COVID period. Since a decrease of the MRP as a result of COVID-19 infection was only noted in two variables, we can highlight appropriateness of the applied RTP. However, further adaptations and improvements of the RTP are needed with regard to high-intensity activities.

Test and Simulation of the Effects of Surface Roughness on a Shrouded Centrifugal Impeller

2014 ◽  
Author(s):  
William T. Cousins ◽  
Lei Yu ◽  
Jacquelynn Garofano ◽  
Barbara Botros ◽  
Vishnu Sishtla ◽  
...  
Keyword(s):  
Surface Roughness ◽  
Cfd Simulation ◽  
Centrifugal Impeller ◽  
Test Results ◽  
Cfd Simulations ◽  
Computational Fluid Dynamics Cfd ◽  
The Common ◽  
R Value ◽  
The Impact ◽  
Grain Roughness

Surface roughness is an important parameter in the operational efficiency and loss development of turbomachinery components. Many computational fluid dynamics (CFD) simulations are performed on turbomachinery, but often one of the common assumptions is that the surfaces are hydraulically smooth. In this work, examination of the surfaces of two cast impellers is performed and compared to machined impellers with smoother surfaces. Both impeller sets were run in a two-stage industrial chiller unit using R134a refrigerant. Test results are presented and the impact of surface roughness modeling on the design is reviewed. Also discussed is the theory of the impact of roughness on turbulent boundary layers. Details about providing the CFD simulation with the proper sand grain roughness is discussed when surface finish (R-value) in microinches (μin) is measured.

scholarly journals COVID-19 testing and cases - a complex relationship in three acts.

2020 ◽  
Author(s):  
Claus Heinrich
Keyword(s):  
Regression Models ◽  
Case Fatality ◽  
Test Results ◽  
Linear Regression Models ◽  
Before And After ◽  
German Legislation ◽  
National Test ◽  
The Impact ◽  
The Relationship ◽  
Political Decisions

<p>If and how the increasing numbers in confirmed COVID 19 cases are driven by the simultaneous expansion of test capacities and tests conducted is a question under continuous debate. Building on the hypothesis, that the impact of increased testing might not be constant over time but determined by the national test policy applied, the relationship between testing and number of cases was investigated in different phases of the pandemic with a focus on the time before and after a change in German legislation on May 22, 2020 that opened the door for more tests in asymptomatic persons for prevention and containment purposes. Based on linear regression models it is estimated that about 60% of the cases tested positive after May 22 can be attributed to increased testing, while eliminating the test effect does not substantially impact the numbers before that date. Likewise, the clinical presentation of cases registered after May 22 is significantly different, with a hospitalization rate of 8.12% (before 18.17%) and a case fatality rate of 0.63% (before 5.17%).</p> <p>It is concluded that expanding the number of tests as it was done in Germany did not lead to a better understanding of the epidemiology of COVID 19. It is recommended to separate test results from preventive testing and testing based on a clinically defined test strategy, and to only use the latter for surveillance and as a basis for political decisions.</p>

Privileging pharmacists improves time to patient notification in the microbiological test review process for patients discharged from the emergency department

2020 ◽  
Vol 77 (Supplement_1) ◽  
pp. S19-S24
Author(s):  
Steven M Loborec ◽  
Jose A Bazan ◽  
Nicole V Brown ◽  
Mary Beth Shirk ◽  
Trisha A Jordan
Keyword(s):  
Emergency Department ◽  
Medical Center ◽  
Academic Medical Center ◽  
Test Results ◽  
Infectious Disease Physician ◽  
Microbiological Test ◽  
Test Review ◽  
Academic Medical ◽  
Before And After ◽  
The Impact

Abstract Purpose Results of a study evaluating the impact of privileging pharmacists to manage microbiologic test results for patients discharged from the emergency department (ED) are reported. Methods This was a single-center, retrospective pre-post study that was conducted at an urban academic medical center. Patients discharged from the ED with a subsequent positive microbiologic test result before and after privileging of an ED specialty practice pharmacist (ED-SPP) to manage the results independently were screened for inclusion. Time to patient notification of a required change in antimicrobial therapy was compared between groups. Numbers of erroneous interventions before and after pharmacist privileging were compared to assess the safety of implementation. Results One hundred seventy-eight positive microbiologic test results (n = 92 pre- and n = 86 postimplementation) were included. The median time to patient notification in the pre-implementation group was 23.6 hours (range, 12.4-93 hours) and in the postimplementation group was 14.9 hours (range, 2.5-27.9 hours; P = 0.0023). As determined by the board-certified infectious disease physician, 1.1% of reviewed microbiologic test results (1 of 92) was erroneous prior to implementation of pharmacist privileging compared with 2.3% (2 of 86) after implementation (P = 0.6105). Conclusion Privileging ED-SPPs to assess microbiologic test results improved the time to patient notification with no statistical difference in the number of erroneous interventions between groups. These findings demonstrate the benefit of clinical privileging and provide support for expansion of this role to other ED-SPPs.

scholarly journals Improving Astm A516 Grade 70 Mechanical Properties by Sandblasting Process

2018 ◽  
Vol 7 (4.35) ◽  
pp. 216
Author(s):  
Omar Suliman Zaroog ◽  
S.A.P. Sughanthy ◽  
Mohd Rashdan Isa ◽  
M.N.M. Ansari
Keyword(s):  
Mechanical Properties ◽  
Surface Roughness ◽  
Tensile Test ◽  
Hardness Test ◽  
Time Duration ◽  
Before And After ◽  
Tensile Test Result ◽  
Test Result

Nowadays, sandblasting is commonly use in industries. The ability of sandblasting is to remove any stain, unwanted matter and many other functions making this process generally used worldwide. The effect of sandblasting on mechanical properties of ASTM A516 grade 70 was investigated in this study. Samples of the material have been sandblasted with different size of grits and times. Surface roughness, hardness and tensile was measured before and after sandblasting. The roughness test result showed that when the time duration of sandblasting increased, the roughness of the specimen also increased. Based on hardness test result, it showed that the hardness improved when the smallest size of grits was applied. However, the hardness decreased when the size of grits and time was increased. The tensile test result pattern showed quite similar to hardness test result. The size of grits and time duration for sandblasting need to set depending on application of the sandblasting process usage applied to the samples or materials.

Apparent Intracellular Helicobacter pylori Detected by Immunohistochemistry: The Missing Link in Eradication Failure

2020 ◽  
Author(s):  
Andrea Beer ◽  
Helmut Hudler ◽  
Maria Hader ◽  
Michael Kundi ◽  
Susanne Hudler ◽  
...  
Keyword(s):  
Helicobacter Pylori ◽  
Eradication Therapy ◽  
Test Results ◽  
First Line ◽  
Before And After ◽  
Living Bacterium ◽  
Gastric Biopsies ◽  
Polymerase Chain ◽  
H Pylori ◽  
The Impact

Abstract Background Helicobacter pylori is primarily an extracellularly living bacterium. However, seemingly intracellular occurrence can often be detected by immunohistochemical stains. Considering antimicrobial resistance, we investigated the impact of the apparent intracellular H. pylori (aiHp) on treatment failure of first-line triple therapies. Methods Gastric biopsies of 814 patients infected with H. pylori naive to treatment were analyzed before and after eradication therapy by immunohistochemistry. Of these, 373 received treatment consisting of amoxicillin, clarithromycin, and proton pump inhibitor (AC/PPI). Availability of polymerase chain reaction-based clarithromycin susceptibility test results from pretreatment gastric biopsies was a precondition for matching 52 aiHp to 52 non-aiHp cases within the AC/PPI group. Results AiHp were detected mostly in low counts predominantly in corpus biopsies, rarely in antrum biopsies (95.2% vs 24.6%); they were found in 497 (61%) of all patients and in 192 of 373 patients (51.5%) in the AC/PPI group. The eradication rate in aiHp versus non-aiHp cases was 44.4% versus 72.9% in the entire sample and 45.3% versus 66.8% in the AC/PPI group. Among the 104 paired patients, respective values were 46.2% versus 78.8%; in clarithromycin-susceptible cases, 60.6% versus 91.9%. Both aiHp and resistance to clarithromycin proved to be highly significant (P ≤ .001) and independent predictors of eradication failure. Twelve of 13 aiHp cases with a clarithromycin-sensitive strain who failed eradication developed resistance to the antibiotic. Conclusions AiHp found by immunohistochemical staining especially in corpus biopsies proved to be a risk factor for failure of first-line triple therapies; occurrence of aiHp should be considered with regard to therapy options.

Effects of Annealing Process on Mechanical Properties of Weather-Resistant Steel Welding Joints

2018 ◽  
Vol 777 ◽  
pp. 397-401
Author(s):  
Qiang Zhang ◽  
Zhe Wu ◽  
Hong Wu Li
Keyword(s):  
Mechanical Properties ◽  
Impact Energy ◽  
Welded Joints ◽  
Impact Test ◽  
Resistant Steel ◽  
Test Results ◽  
Before And After ◽  
Welding Joints ◽  
Weld Area ◽  
The Impact

In this paper, the mechanical properties of Q355NH resistant steel welded joints are studied. Through the analysis of mechanical properties of welded joints, the results showed that the tensile strength of the welded joints decreased after annealing and the elongation increased. The impact test results of tensile specimens before and after annealing showed that the impact energy of the weld area increased greatly after annealing, while the impact energy of the heat affected zone changed little. Furtherly, fatigue strength of specimens before and after annealing was compared, and the results showed that under the condition of high cycle fatigue, the un-annealed specimens were broken and the fracture position was located on the parent metal, whereas the annealed specimens did not break.

scholarly journals The Influence of Storytelling Method on the Public Speaking Communication Skills among the Students of Mercu Buana University Meruya West Jakarta

2021 ◽  
Vol 9 (4) ◽  
Author(s):  
Gustina Romaria
Keyword(s):  
Communication Skills ◽  
Public Speaking ◽  
Hypothesis Test ◽  
Statistical Test ◽  
Test Results ◽  
The Public ◽  
Normality Test ◽  
Before And After ◽  
Post Test ◽  
The Impact

The study aims at identifying the public speaking communication skills among the students of Mercu Buana University Meruya, West Jakarta, before and after the implementation of the storytelling method. In addition, the study also aims at identifying the presence or the absence of the impact of the storytelling method on the public speaking communication skills of the Mercu Buana University students in Meruya, West Jakarta. By using the SPSS Version 20, 40 students have been gathered as the samples of the study and these students come from all faculties in the Mercu Buana University. After the data have been gathered, the data are analyzed using the descriptive statistical test and the hypothesis test. In this regard, the researchers have implemented the normality test and the hypothesis test. The hypotheses within the study are tested using the following criteria: (1) if the rate of significance < a (sig. value < 0.05) then Ho is rejected and Ha is accepted; and (2) if the rate of significance > a (sig. value > 0.05) then Ho is accepted and Ha is rejected. The results of the study show that the students of Mercu Buana University have understood the concept and the implementation of the storytelling method. From the results of the analysis toward the assessment category of the storytelling method, out of 8 assessment variables 3 variables do not have significant influence on the storytelling method that the students of Mercu Buana University have implemented and the three variables are Pressure, Material Disclosure, and Participant Gesture. In addition, the results of the paired sample t-test there are significant differences between the pre-test results and the post-test results. These findings show that the storytelling method is highly influential for the changes on the public speaking communication skills that the students of Mercu Buana University perform.

Sign in / Sign up

Export Citation Format

Share Document