Experimental study of vibroinsulating properties of modern structural polyurethane

2019 ◽  
pp. 120-127
Author(s):  
S. N. Yakovlev ◽  
A. A. Chernysh
Keyword(s):  
Experimental Study ◽  
Absorption Coefficient ◽  
Energy Absorption ◽  
Experimental Research ◽  
Mechanical Engineering ◽  
Polyurethane Elastomer ◽  
Polyurethane Elastomers ◽  
Final Choice ◽  
Shock Absorbers ◽  
Two Parameters

Modern mechanical engineering often uses polyurethane elastomers as vibroinsulating material. It is difficult to choose the most perfect structural polyurethane among a large number of proposed materials for manufacturing shock absorbers. The article presents experimental research of vibroinsulating properties using two parameters out of five. Based on preliminary tests, an implicit preference is given to one of the three proposed materials. The energy absorption coefficient and the creep of the elastomer are chosen as criteria for evaluating the vibroinsulation properties of polyurethane elastomers. Final choice of polyurethane elastomer for shock absorbers manufacturing could be made if additional tests are carried out for studying three criteria.

Researching internal friction module of polyurethane elastomers under alternating bending with rotation

2019 ◽  
pp. 71-78
Author(s):  
L. V. Podkolzina ◽  
S. N. Yakovlev ◽  
A. A. Chernysh
Keyword(s):  
Internal Friction ◽  
Evaluation Criteria ◽  
Frequency Range ◽  
Polyurethane Elastomers ◽  
Comparative Tests ◽  
Shock Absorbers ◽  
Elastomeric Materials ◽  
Reasonable Choice ◽  
Two Parameters ◽  
Alternating Bending

Today there is a large number of vibration-proof materials for the manufacture of shock absorbers in the market of structural materials. For a reasonable choice, it is necessary to perform comparative tests of different elastomers according to several criteria. The paper presents the results of two-parameters comparative tests of three brands of polyurethane elastomers. As the evaluation criteria, the internal friction module and the loss tangent of elastomeric materials under alternating bending with rotation are chosen. High stability of physicomechanical properties of polyurethane elastomers is studied in the entire frequency range of mechanical vibrations.

EXPERIMENTAL STUDY OF THE KINEMATIC PARAMETERS OF MOVEMENT OF CARS FORCED IDLE MOTION

2018 ◽  
pp. 52-57
Author(s):  
Ivelin Kostov
Keyword(s):  
Experimental Data ◽  
Experimental Study ◽  
Experimental Research ◽  
Kinematic Parameters ◽  
Research Results ◽  
Software Product

In the work brought some experimental data of kinematic parameters of movement of cars forced idle, as the software product was used to diagnose 900 ATS, which recorded kinematic parameters of vehicle. On the basis of the conducted experimental research results are shown tabulated and analysed.

Results of an experimental study of hydrogel drainage containing ranibizumab in antiglaucoma operations

2021 ◽  
pp. 63-67
Author(s):  
I.I. Khusnitdinov ◽  
Keyword(s):  
Experimental Study ◽  
Hyaluronic Acid ◽  
Key Words ◽  
Experimental Research ◽  
Experimental Studies ◽  
Glaucoma Surgery ◽  
Control Group ◽  
Morphological Studies

Purpose. Еxperimental substantiation of the effectiveness of biocompatible biodegradable hydrogels based on hyaluronic acid and chitosan succinate as a carrier of ranibizumab in antiglaucoma operations. Material and methods. Hydrogel drainage (HD) was obtained immediately before surgery. A solution of ranibizumab (0.23 ml) was mixed with a solution of hyaluronic acid dialdehyde (0.5 ml), then a solution of chitosan succinate (0.5 ml) was added. Experimental studies were performed in 12 (12 eyes) healthy rabbits. The first group consisted of 6 eyes – 0.187 ml of ranibizumab per 1 ml of gel. In the control group, HD was used intraoperatively without the addition of ranibizumab (6 eyes). Morphological studies were performed on 7th, 21st, and 42nd days. Results. In experimental studies in vitro and in vivo, it was proved that ranibizumab, administered as a part of 0.1 ml of hydrogel drainage in the antiglaucoma surgery area is released within 3 weeks and suppresses vascularization, scarring of the operating area, and preserves the intrascleral cavity. The optimal concentration of ranibizumab was selected-0.02 ml in 0.1 ml of gel. Conclusion. The safety and effectiveness of the use of hydrogel drainage with ranibizumab based on hyaluronic acid dialdehyde and chitosan succinate in anti-glaucoma operations has been proven. Key words: experimental research, hydrogel drainage, ranibizumab, glaucoma surgery.

Investigation on Energy Absorption Characteristics of PVB Laminated Windshield Subject to Human Head Impact

2010 ◽  
Vol 34-35 ◽  
pp. 956-960 ◽  
Author(s):  
Bo Han Liu ◽  
Meng Yi Zhu ◽  
Yue Ting Sun ◽  
Jun Xu ◽  
Dong Yun Ge ◽  
...  
Keyword(s):  
Dynamic Behavior ◽  
Energy Absorption ◽  
Human Head ◽  
Head Impact ◽  
Laminated Glass ◽  
Absorption Property ◽  
Element Simulation ◽  
Impact Position ◽  
Two Parameters ◽  
Absorption Characteristics

In this paper, energy absorption characteristics of PVB laminated windshield subject to human head impact are studied. SHPB method is carried out to obtain the constitutive relationships of PVB laminated glass in dynamic behavior. With the SHPB results embedded, finite element simulation is used to study the dynamic behavior of PVB laminated windshield. In particular, energy absorption characteristics are investigated. Two parameters for measuring the energy absorption property of windshield are suggested, i.e. loss of head velocity and HIC value and a parametric study is carried out to see the effect of impact velocity and impact position. Results can shed lights on the research of energy absorption capability of PVB laminated windshield.

scholarly journals The Effect of Repeat Tax Amnesty and Tax Penalty Policy on Taxpayer Compliance (An Experimental Study)

2021 ◽  
Vol 8 (10) ◽  
pp. 105-116
Author(s):  
Ni Putu Riasning ◽  
Anak Agung Bagus Amlayasa ◽  
Luh Kade Datrini
Keyword(s):  
Experimental Study ◽  
Hypothesis Testing ◽  
Experimental Research ◽  
Research Output ◽  
Tax Compliance ◽  
University Research ◽  
Accounting Students ◽  
Repeated Application ◽  
Tax Amnesty ◽  
Compliance Decisions

This study aims to (1) examine the effect of repeated tax amnesty knowledge on taxpayer compliance, (2) examine the effect of tax sanctions on taxpayer compliance based on threats to taxpayer compliance decisions, and (3) examine differences in taxpayer compliance based on taxpayer knowledge, on the re-implementation of tax amnesty and the effect of tax sanctions on taxpayer compliance decisions. This study used a 2 x 2 factorial experimental research design between subjects by using 119 participants from accounting students from the Faculty Economic and Busines Warmadewa University. The results showed that both the knowledge of taxpayers on the re-implementation of tax amnesty and the effect of tax sanctions on taxpayer compliance decisions can affect taxpayer compliance. Besides that too, there is an interaction between taxpayer knowledge on the re-implementation of tax amnesty and the effect of tax sanctions on taxpayer compliance decisions where if the taxpayer is in a condition not aware of the repeated application of the tax amnesty, taxpayers who also receive high tax sanctions will show the highest degree of compliance, compared to subjects in other situations. Hypothesis testing using a different test t test with the help of the SPSS 26.0 program. The expected research output is that the results of this research will be published in the proceedings of the Warmadewa of University Research Institute. Keywords: Recurring tax forgiveness, tax sanctions, tax compliance.

scholarly journals PENGGUNAAN METODE EKSPERIMEN PADA PEMBELAJARAN MATERI SIFAT BAHAN DAN KEGUNAANNYA TERHADAP HASIL DAN RESPON BELAJAR SISWA KELAS IV MIN TUNGKOB ACEH BESAR

2013 ◽  
Vol 13 (2) ◽  
Author(s):  
Wati Oviana ◽  
Maulidar Maulidar
Keyword(s):  
Experimental Study ◽  
Data Collection ◽  
Experimental Method ◽  
Learning Outcomes ◽  
Experimental Research ◽  
Experimental Methods ◽  
Learning Material ◽  
Primary School Students ◽  
School Students ◽  
Material Characteristics

The research on the use of experimental methods in learning characteristics of material and its usefulness toward students’ achievements and learning responses of Level 4 primary school students of MIN Tungkob Aceh Besar aims to determine students’ learning outcomes and responses toward the use of the method. This study uses experimental research. The data collection techniques were using test and distributing questionnaire to the students. The samples in this experimental study were students of class IV3 totaling 34 people as the experimental class and the class IV4 totaling 31 people as the control class. The data, which is the students’ learning outcomes collected from pretest and posttest, were analyzed using t-test formula. The data from the students’ questionnaire responses were analyzed using percentage formula.The result was that the students’ learning outcomes from the experimental class and the control class showed significant differences. Students’ responses toward the use of experimental methods in learning material characteristics and its usefulness were also very positive, where the students are very excited and interested in learning to use the experimental method in the study of material characteristics and its usefulness.

The Sucrose-Natural Gypsum Makes the Compound Retarder to the Cement and the Concretes Performance Influence Experimental Study

2011 ◽  
Vol 335-336 ◽  
pp. 1219-1222
Author(s):  
Ru Qin Wang
Keyword(s):  
Experimental Study ◽  
Physical Properties ◽  
Experimental Research ◽  
Mixing Time ◽  
The Other ◽  
Positive Correlation ◽  
Other Hand ◽  
Cement And Concrete

By the experimental research to the effect sucrose-natural gypsum as composite retarder on the performance of cement and concrete. This paper analyzes and summarizes the fact that the influence of this kind of composite retarder is more obvious than the slow setting effect of a single sugar or plaster. And the retardation of cement and concrete the mixing time is basically the amount of sugar a positive correlation. And on the other hand, it will not influence other physical properties.

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