scholarly journals Study on the technology of strengthening concrete by impregnation with modified sodium silicate compound strengthening fluid

2021 ◽  
Vol 293 ◽  
pp. 02021
Author(s):  
Yang Dishan ◽  
Yan Tongyu ◽  
Huang Xiaoyu ◽  
Xiong Ying ◽  
Lin Xi ◽  
...  
Keyword(s):  
Sodium Silicate ◽  
Strengthening Mechanism ◽  
Test Results ◽  
Concrete Repair ◽  
Strength Based ◽  
Before And After

It is the key to the concrete repair and strengthening construction that the base concrete has a certain quality and strength. Based on the strengthening mechanism of sodium silicate, the sodium silicate was modified to develop a kind of compound strengthening liquid. Through the contrast test results of concrete impregnation. The strength of C5 concrete before and after strengthening is increased by 42.5%, while the strength of C10 concrete is increased by 21.4%, and the strength of C15 concrete is increased by 10%.

Sunlight exposure: the effects on the performance of paragliding fabric

2018 ◽  
Vol 69 (05) ◽  
pp. 381-389
Author(s):  
MENGÜÇ GAMZE SÜPÜREN ◽  
TEMEL EMRAH ◽  
BOZDOĞAN FARUK
Keyword(s):  
Mechanical Properties ◽  
Aging Process ◽  
Air Permeability ◽  
Sunlight Exposure ◽  
Test Results ◽  
Coating Materials ◽  
Strength Tests ◽  
Before And After ◽  
The Relationship ◽  
Dark Blue

This study was designed to explore the relationship between sunlight exposure and the mechanical properties of paragliding fabrics which have different colors, densities, yarn counts, and coating materials. This study exposed 5 different colors of paragliding fabrics (red, turquoise, dark blue, orange, and white) to intense sunlight for 150 hours during the summer from 9:00 a.m. to 3:00 p.m. for 5 days a week for 5 weeks. Before and after the UV radiation aging process, the air permeability, tensile strength, tear strength, and bursting strength tests were performed. Test results were also evaluated using statistical methods. According to the results, the fading of the turquoise fabric was found to be the highest among the studied fabrics. It was determined that there is a significant decrease in the mechanical properties of the fabrics after sunlight exposure. After aging, the fabrics become considerably weaker in the case of mechanical properties due to the degradation in both the dyestuff and macromolecular structure of the fiber

scholarly journals An Empirical Study on the Application of Cooperative Learning to Comprehensive English Classes in a Chinese Independent College

2017 ◽  
Vol 10 (2) ◽  
pp. 94
Author(s):  
Ji Meng
Keyword(s):  
Cooperative Learning ◽  
Empirical Study ◽  
Test Results ◽  
Independent College ◽  
Language Competence ◽  
English Classes ◽  
Academic Level ◽  
Before And After ◽  
Posttest Questionnaire ◽  
Positive Impacts

This research investigated a comparison between the effect of cooperative learning and lecture teaching on Comprehensive English classes in a Chinese Independent College. An empirical study for two semesters was carried out in the forms of pretest, posttest, questionnaire and interviews. While control class was taught in the conventional way, experiment class was instructed based on cooperative base groups with positive interdependence structured on purpose. Compared with traditional instructions, cooperative learning as pedagogy can improve students’ performance on course exams, but not necessarily their language competence as shown in national English competency tests taken before and after the experiement. Test results also indicate students from experiment class who excelled in competency test outnumbered those from control class, revealing that cooperative learning has positive impacts especially on students at a relatively higher academic level. Questionaire results show that students are most inclined to agree they have more chances to practice the language in a cooperative environment.

Characteristics of Phenomena in Powders Type RE2Zr2O7-Al2O3 in High Temperature Annealing Conditions

2011 ◽  
Vol 312-315 ◽  
pp. 583-588 ◽  
Author(s):  
Grzegorz Moskal ◽  
Lucjan Swadźba ◽  
Marek Hetmańczyk ◽  
Bartosz Witala
Keyword(s):  
High Temperature ◽  
Perovskite Oxide ◽  
Differential Scanning Calorimetric ◽  
Test Results ◽  
Dsc Analysis ◽  
Annealing Conditions ◽  
Before And After ◽  
Influence Of Temperature On ◽  
Dta Analysis ◽  
Type Bond

The paper presents test results and characterizes the structural stability of powders, which form a mixture of aluminium oxide (Al2O3) and gadolinium, based on rare earth zirconates. This mixture is provided to create thermal barrier coatings (TBCs) by spraying. The purpose of the tests was to determine the influence of temperature on reactions, occurring between those powders within a temperature range from 25°C to 1500°C, while such conditions were to simulate the conditions, which occur during creation of TBCs and they give an answer to the question concerning mutual reactivity of the powders. The requirements for new materials, provided to spray the TBCs, indicate the necessity to prepare the materials, which do not show tendency towards reactions with the Al2O3, formed during oxidation of Ni (Co) CrAlY, while this reaction is of type bond coat. The tests included differential scanning calorimetric (DSC) analysis and differential thermal analysis (DTA) of powder mixtures. Diffraction analysis was also performed before and after the tests have been finished. The DSC analysis results, obtained at a range of high temperature, did not show any thermal effects, which indicate a low level of mutual reactivity of the powders. However, the DTA analysis suggests presence of such effects at temperature close to 1300°C, and it indicates the necessity to verify exactly the obtained results. Results of the XRD measurement showed that after annealing process already at 1100°C the perovskite oxide of GdAlO3 was present.

Effect of styrene–butadiene–styrene content on the adhesion properties of bitumen before and after heat aging

2008 ◽  
Vol 35 (5) ◽  
pp. 454-460 ◽  
Author(s):  
Krzysztof Zieliński
Keyword(s):  
Adhesion Strength ◽  
Test Results ◽  
Adhesion Properties ◽  
Before And After ◽  
Styrene Content ◽  
Styrene Butadiene Styrene ◽  
Styrene Butadiene ◽  
Steel Substrates ◽  
Butadiene Styrene

This article describes the effect of heat aging and styrene–butadiene–styrene (SBS) content in bitumen on the adhesion properties of mastics (bitumen-filler mix) to concrete and steel substrates. Test results showed that the adhesion strength of bituminous mastics to concrete and steel substrates decreased as the SBS content increased. Bitumen types modified with 9%–12% of SBS, commonly used in waterproofing materials, showed an approximately three times weaker bond with concrete and steel substrates than the nonmodified equivalents. Results also showed that after heat aging, the adhesion strength of the nonmodified bitumen was always higher than that of the unheated bitumen modified with 9%–12% of SBS.

POLICY OF PROMOTING ALCOHOL CONSUMPTION IN TIMES OF COVID-19 LOCKDOWN IN INDIA: A MEDICAL AND CONSTITUTIONAL ANALYSIS.

2021 ◽  
pp. 21-24
Author(s):  
Neha Sharma ◽  
Ayush Anand ◽  
Shreyas Joshi ◽  
Samrat Ray
Keyword(s):  
Mobile Application ◽  
Prospective Observational Study ◽  
Social Contact ◽  
Contact Tracing ◽  
Family Welfare ◽  
Cumulative Number ◽  
Test Results ◽  
Before And After ◽  
The Given ◽  
Constitutional Analysis

BACKGROUND: India, with the declaration of COVID-19 as a pandemic, started imposing restrictions in the country th and initiated a nationwide lockdown under Section 6 of the Disaster Management Act, 2005 on 24 March 2020, followed by four phases of lockdown and then gradual unlock of the country. The rationale behind the same was to avoid social contact. Alcohol dispensing was also stopped during this time and was among the rst services to be reopened by the States. We propose in this paper that this lifting of ban on alcohol sale during the pandemic has led to a signicant increase in the number of COVID-19 cases in the country. METHODS: This is a prospective, observational study, done by collecting data from the Aargya Setu App, which is a mobile application launched by the Ministry of Health and Family Welfare on 2 April 2020 for contact tracing and elf assessment of COVID-19. The data of cumulative number of cases in 12 selected states of the country were compared before and after the lift of ban of alcohol and signicance was shown by the paired t test. RESULTS: The number of COVID-19 positive cases in the country during nationwide lockdown with simultaneous ban on alcohol sale when compared to cumulative number of cases after the lift of ban of alcohol sale during Lockdown and initial Unlock is statistically signicant (p = 0.04) CONCLUSION: We found that the decision to restart the sale of Alcohol could have been a factor for rise in number of cases in the country in the given timeframe. The decision to start the sale has also not been in accordance with the Indian Constitution and against the nation's founding ethics.

scholarly journals Analisis Reaksi Pasar Terhadap Pengumuman Merger dan Akuisisi Pada Perusahaan Akuisitor yang Terdaftar di BEI

2018 ◽  
pp. 1870
Author(s):  
Ika Putri Adnyani ◽  
Gayatri Gayatri
Keyword(s):  
Abnormal Return ◽  
Trading Volume ◽  
Sampling Method ◽  
Stock Exchange ◽  
Cumulative Abnormal Return ◽  
Test Results ◽  
Volume Activity ◽  
Paired Sample ◽  
Analysis Technique ◽  
Before And After

This research is conducted on all acquisition companies that conduct acquisitions listed on Indonesia Stock Exchange 2011-2016 period. Sampling method using purposive sampling. The number of samples of this research is 50 companies. The market reaction in this study used abnormal return and trading volume activity. The testing of information content will be done by looking at differences in cumulative abnormal return and the average trading volume of shares five days before and five days after the announcement of the acquisition. Data analysis technique used is paired sample t-test. Based on the test results, found there are significant differences in the abnormal return of the acquirer company before and after the announcement of the acquisition. However, there is no difference in trading volume activity of the acquirer's stock before and after the acquisition announcement   Keywords: acquisitions, stock market, abnormal return, trading volume activity

scholarly journals In-plane Shear Strengthening of Unreinforced Masonry Walls Using GFRP Jacketing

2017 ◽  
Author(s):  
Enea Mustafaraj ◽  
Yavuz Yardim
Keyword(s):  
Experimental Results ◽  
Test Results ◽  
Compression Tests ◽  
Shear Strengthening ◽  
Plane Shear ◽  
Standard Size ◽  
Reinforced Polymer ◽  
Glass Fiber Reinforced ◽  
Diagonal Compression ◽  
Before And After

In this paper, it is presented the experimental results of a campaign on diagonal compression tests, as of ASTM E519-02, to assess and compare the in-plane behavior of standard size of 1200 × 1200 × 250 mm, for three unreinforced and three reinforced wall panels by glass fiber reinforced polymer (GFRP) embedded in an inorganic matrix.From the diagonal compression test results, were determined some of the main mechanical parameters such as: shear strength, modulus of rigidity and ductility, before and after application of the reinforcement.The experimental results showed that the GFRP reinforced panels exhibited a significant increase of 127% in shear resistance, 1100% in ductility and 650% in modulus of rigidity when compared to unreinforced panels.It was concluded that this technique provided satisfactory results and can be considered a suitable method for repair of masonry structures.

scholarly journals The impact of a teacher-based positive education intervention on student wellbeing literacy

2021 ◽  
Vol 2 (1) ◽  
pp. 22-43
Author(s):  
Lea Waters ◽  
Matthew Charles Higgins
Keyword(s):  
Mental Health ◽  
Education Intervention ◽  
Positive Education ◽  
Post Intervention ◽  
Emotional Management ◽  
Strength Based ◽  
Before And After ◽  
Education Interventions ◽  
Written Descriptions ◽  
The Impact

Over the past decade, research has consistently found that positive education interventions have a beneficial effect on mental health outcomes for students, such as improvements in life satisfaction and reduction of anxiety. While it is encouraging to see these changes in student mental health, the research has not yet adequately explored whether positive education interventions change a student’s understanding of wellbeing itself. Wellbeing literacy is a new construct within the field of positive education and is defined as the ability to understand the concept and language of wellbeing. This study examines whether student language and understanding of wellbeing changes following an intervention that trains teachers in the core principles of positive education. Students across grades five, six and seven (ages 11–13; n = 231) from three Australian schools provided brief written descriptions of their understanding of wellbeing before and after their teachers undertook an eight-month positive education intervention. Thematic analysis was used as the methodological tool to analyze student language and understanding of wellbeing. Inferential frequency-based statistical analyses were used to compare the pre-intervention and post-intervention responses. The results revealed that student understanding of wellbeing evolved in four key ways to become more: (1) detailed; (2) strength based; (3) expanded/multidimensional; and (4) relational. Post-intervention understanding of wellbeing was significantly more likely to include aspects of emotional management, strengths, coping, mindfulness and self-kindness. Implications, limitations and future directions are discussed.

scholarly journals Effect of Temperature on the Tribological Properties of Selected Thermoplastic Materials Cooperating with Aluminium Alloy

Materials ◽  
2021 ◽  
Vol 14 (23) ◽  
pp. 7318
Author(s):  
Anita Ptak ◽  
Paula Taciak ◽  
Wojciech Wieleba
Keyword(s):  
Aluminium Alloy ◽  
Contact Pressure ◽  
Tribological Properties ◽  
Polymer Materials ◽  
Effect Of Temperature ◽  
Test Results ◽  
Friction Process ◽  
Before And After ◽  
Pin On Disc ◽  
Two Parameters

This article concerns the tribological properties of three selected polymer materials: polyamide PA6, polyethylene PE-HD and polyetheretherketone composite PEEK/BG during sliding against aluminium alloy EN AW-2017A in the presence of hydraulic oil HLP 68. The tests were carried out under contact pressure p of 3.5–11 MPa at ambient temperature T ranging from −20 °C to +20 °C. The dependence of kinetic friction coefficient μk on the two parameters was determined through tribological tests carried out using a pin-on-disc tribometer. A five-level central composite rotatable design (CCRD) was adopted for the experiment. All the test results were statistically analysed. The microhardness of the surface of the polymeric material was measured before and after the friction process. The surface was also examined under SEM. Temperature and contact pressure have been found to have a significant effect on the tribological properties of the tested sliding pairs. Relative to the applied friction conditions, the surfaces after friction showed rather heavy signs of wear.

scholarly journals Effectiveness of the Use of Manual and Electric Toothbrushes and the Effect of Educational Brushing Teeth with Video Animation on OHI-S Children with Down syndrome

2021 ◽  
Vol 4 (1) ◽  
pp. 6
Author(s):  
Alivy Aulia Az Zahra ◽  
Natasha Winona Audrey ◽  
Devalna Siwi Ichyana ◽  
Tania Saskianti ◽  
Seno Pradopo ◽  
...  
Keyword(s):  
Down Syndrome ◽  
Visual Learning ◽  
Tooth Brushing ◽  
Test Results ◽  
Significant Difference ◽  
Before And After ◽  
Manual Toothbrush ◽  
Electric Toothbrush ◽  
And Control ◽  
Control Purpose

Background: Down Syndrome children have better ability in capturing instructions visually. The audio-visual learning method can be applied to Down Syndrome children. Electric toothbrushes were made to make it easier for them to brush their teeth, besides those electric toothbrushes have a handle that is comfortable to hold and control. Purpose: The purpose of this study is to determine the effectiveness of electric and manual toothbrushes on Down Syndrome children OHI-S scores and determine the effect of education on tooth brushing with animated videos on Down Syndrome children OHI-S scores. Methods: Subjects of the study were 34 Down Syndrome children aged 6-19 years in Surabaya, East Java, Indonesia. OHI-S scores were recorded before and after the subjects were educated to brush their teeth with animated videos or dental phantoms. OHI-S scores were also recorded before and after the subjects brushed their teeth using manual toothbrushes or electric toothbrushes. Results: The test results Independent T-test (p> 0.05) showed there was no significant difference between tooth brushing using a manual toothbrush and an electric toothbrush to the decline of OHI-S score of Down Syndrome children. The results of the Mann-Whitney statistical test were p> 0.05, that there was no significant difference in the reduction in OHI-S scores between Down Syndrome children who were educated with animated videos and dental phantoms. Conclusion: There was no significant difference between manual toothbrushes and electric toothbrushes and there was no significant influence of Down Syndrome OHI-S children who were educated with animated videos or dental phantoms.

Sign in / Sign up

Export Citation Format

Share Document