scholarly journals Formation of the voltage pulses up to 400 kilovolts with front pulse less than 10 nanoseconds

2021 ◽  
Vol 2064 (1) ◽  
pp. 012126
Author(s):  
B A Kozlov ◽  
D S Makhanko
Keyword(s):  
Experimental Study ◽  
Operating Voltage ◽  
Basic Information ◽  
Factors Affecting ◽  
X Ray ◽  
Spark Gap ◽  
Metal Ceramic ◽  
Main Factors ◽  
Ceramic Design ◽  
Switching Characteristics

Abstract This work presents basic information about the design, manufacturing technology, and application of small-sized sealed-off spark-gaps in metal-ceramic design with hydrogen filling up to 120 atmospheres at an operating voltage of 100-400 kV with switching energy of up to 10 Joules in pulsed X-ray flaw detectors. The main factors affecting the mechanical strength and stability of the spark-gap operation are described. The results of an experimental study of the switching characteristics of the RO-49 spark gap-sharpeners are presented.

scholarly journals X-ray diffraction of concrete composites of high structural strength and density

2021 ◽  
Vol 22 (4) ◽  
pp. 746-749
Author(s):  
Oleksandr Sumariuk ◽  
Ihor Fodchuk ◽  
Volodymyr Romankevych
Keyword(s):  
Compressive Strength ◽  
Structural Strength ◽  
Cement Stone ◽  
Qualitative Composition ◽  
Hydration Products ◽  
X Ray Diffraction ◽  
Factors Affecting ◽  
X Ray ◽  
Calcium Hydrosilicates ◽  
Main Factors

Аn analysis of the structure formation of concrete composites, compressive strength of which exceeds 120 MPa and a quantitative analysis of their qualitative composition and hydration products by X-ray diffraction, x-ray spectral analysis. The main factors affecting the physicomechanical parameters of the complex of various nanofillers and the formation of a denser cement stone structure, which mainly includes calcium hydrosilicates, calcium silicate hydroaluminates and hydroaluminates of various basicity, are studied.

Experimental investigation of fracture toughness KIIC of frozen soil

2000 ◽  
Vol 37 (1) ◽  
pp. 253-258 ◽  
Author(s):  
Hongsheng Li ◽  
Haitian Yang ◽  
Zengli Liu
Keyword(s):  
Fracture Toughness ◽  
Experimental Study ◽  
Experimental Investigation ◽  
Loading Rate ◽  
Fracture Behaviour ◽  
Frozen Soil ◽  
Slight Effect ◽  
Factors Affecting ◽  
Four Point Bending ◽  
Main Factors

This paper describes an experimental study on the fracture toughness KIIC of pure frozen soil and the behaviour of the interface between frozen soil and concrete. A four-point bending device is used in the test. Experimental results indicate that water content and temperature are the main factors affecting fracture toughness. Within the range of the experiment, loading rate has a very slight effect on fracture toughness. Some formulae are suggested to evaluate the fracture behaviour of frozen soil.Key words: frozen soil, fracture mechanics, fracture toughness, interface.

The effects of elastane and finishing processes on the performance properties of denim fabrics

2019 ◽  
Vol 31 (2) ◽  
pp. 243-258 ◽  
Author(s):  
Selin Hanife Eryuruk
Keyword(s):  
Experimental Study ◽  
Design Methodology ◽  
Performance Properties ◽  
Content Type ◽  
Factors Affecting ◽  
Fabric Structure ◽  
Aesthetic Appearance ◽  
Main Factors ◽  
And Performance ◽  
Finishing Processes

PurposeThe main factors affecting consumers when selecting denim garments are aesthetic, appearance and fashion. Besides these factors, comfort and performance properties of the denim garments during usage are very important. The purpose of this paper is to determine the effects of different finishing processes on the performance properties of 100 percent cotton and 98 percent cotton+2 percent elastane denim fabrics.Design/methodology/approachThe research design for this study consists of experimental study. In order to evaluate the effects of finishing on the performance properties of fabrics, eight types of fabrics were selected for evaluation. Rigid, resin, bleaching and softening type fabrics with and without elastane were analyzed statistically.FindingsThe results obtained in the study clearly showed that the types of finishing and elastane fiber in the fabric structure had a significant influence on mechanical and comfort properties of denim fabrics.Originality/valueAs a result of the literature review, it was seen that there were limited studies concerning mechanical, functional and comfort properties of denim fabrics together. In this study, the effects of finishing processes on the tear strength, stiffness, drape, mechanical and thermal comfort characteristics were deeply evaluated.

scholarly journals THE INTERACTION BETWEEN [Pt(µ-Cl)(Safrole-1H)]2 AND 1,3-DIISOPROPYLBENZIMIDAZOLIUM BROMIDE IN THE PRESENCE OF Ag2O

2020 ◽  
Vol 58 (6) ◽  
pp. 728
Author(s):  
Nguyen Thi Thanh Chi
Keyword(s):  
Single Crystal ◽  
Nmr Spectra ◽  
Molar Ratio ◽  
Trans Position ◽  
Dimeric Complex ◽  
X Ray Diffraction ◽  
Factors Affecting ◽  
X Ray ◽  
In Trans ◽  
Main Factors

The interaction of the dimeric complex [Pt(µ-Cl)(Saf)]2 (1) (Saf: deprotonated safrole) with the salt iPr2-bimy·HBr in the presence of Ag2O in acetone solvent was studied. The obtained products were mixed complexes of [PtCl(Saf)(iPr2-bimy)] (2) and [PtBr(Saf)(iPr2-bimy)] (3) with different molar ratio (PI, PII, PIII)  depended on the used molar ratio of 1:salt:Ag2O. In the case of this ratio being 1:2:1.1, the mixture PI with 75% for the complex 2 was obtained. When concentration of the salt was increased, the product was PII with the molar ratio of 2 : 3 of 1 : 3. However, when both the salt and Ag2O were increased at the same time, 2 and 3 in PIII had equal molar proportions. The two main factors affecting the 2 : 3 molar ratio are the different solubility of AgCl and AgBr and the different coordinating ability of Cl- and Br- ligands. The structure of 2 and 3 was determined by 1H NMR spectra and single crystal X-ray diffraction. The results reveal that Saf in 2 and 3 coordinates with Pt(II) via C=Colefinic and C5 of benzene ring. Meanwhile, iPr2-bimy coordinates with Pt(II) through CNCN and is in trans-position compared with the C=Colefinic bond.

scholarly journals Experimental study on the thermal performance of an air conditioning system in a pure electric vehicle

2021 ◽  
pp. 93-93
Author(s):  
Enhai Liu ◽  
Haijun Li ◽  
Yajun Gong ◽  
Yuping Wei ◽  
Haifei Chen
Keyword(s):  
Experimental Study ◽  
Electric Vehicle ◽  
Heat Pump ◽  
Thermal Performance ◽  
Air Conditioning ◽  
Air Conditioning System ◽  
Factors Affecting ◽  
Discharge Temperature ◽  
Heating Capacity ◽  
Main Factors

This paper studies the thermal performance of an air conditioning system in a pure electric vehicle. An experiment is designed to examine the main factors affecting the performance, and the experimental results show that a heat pump with a low-pressure gas-mixing system can increase the heating capacity and decrease the discharge temperature.

Recent Rapid Climate Changes in Antarctic and their Influence on Low Diversity Ecosystems

2010 ◽  
Vol 17 (1) ◽  
pp. 17-30 ◽  
Author(s):  
Katarzyna J. Chwedorzewska
Keyword(s):  
Environmental Variables ◽  
Climate Changes ◽  
Biological Significance ◽  
Global Changes ◽  
Factors Affecting ◽  
Low Diversity ◽  
Main Factors ◽  
The Antarctic ◽  
High Diversity ◽  
Temperature Water

ABSTRACTThe geographic position, astronomic factors (e.g. the Earth’s maximum distance from the Sun during winter), ice cover and altitude are the main factors affecting the climate of the Antarctic, which is the coldest place on Earth. Parts of Antarctica are facing the most rapid rates of anthropogenic climate change currently seen on the planet. Climate changes are occurring throughout Antarctica, affecting three major groups of environmental variables of considerable biological significance: temperature, water, UV-B radiation.Low diversity ecosystems are expected to be more vulnerable to global changes than high diversity ecosystems

An Experimental Study on Bond between Porcelain and Gold : Observation with Fine Focus X-ray Generator (Part 1)

1978 ◽  
Vol 31 (5) ◽  
pp. 425-431
Author(s):  
Shigeki Murakami ◽  
Yasunari Uchida ◽  
Yoshinori Chikaura
Keyword(s):  
Experimental Study ◽  
X Ray ◽  
Fine Focus

Pitting Corrosion of Biomedical Titanium and Titanium Alloys: A Brief Review

2020 ◽  
Vol 16 ◽  
Author(s):  
Yu-Wei Cui ◽  
Liang-Yu Chen ◽  
Xin-Xin Liu
Keyword(s):  
Corrosion Resistance ◽  
Pitting Corrosion ◽  
Potential Temperature ◽  
Growth Stages ◽  
Factors Affecting ◽  
Ti Alloys ◽  
Pitting Corrosion Resistance ◽  
Superior Mechanical Properties ◽  
Good Biocompatibility ◽  
Main Factors

Abstract:: Thanks to their excellent corrosion resistance, superior mechanical properties and good biocompatibility, titanium (Ti) and Ti alloys are extensively applied in biomedical fields. Pitting corrosion is a critical consideration for the reliability of Ti and Ti alloys used in the human body. Therefore, this article focuses on the pitting corrosion of Ti and Ti alloys, which introduces the growth stages of pitting corrosion and its main influencing factors. Three stages, i.e. (1) breakdown of passive film, (1) metastable pitting, and (3) propagation of pitting, are roughly divided to introduce the pitting corrosion. As reviewed, corrosive environment, applied potential, temperature and alloy compositions are the main factors affecting the pitting corrosion of Ti and Ti alloys. Moreover, the pitting corrosion of different types Ti alloys are also reviewed to correlate the types of Ti alloys and the main factors of pitting corrosion. Roughly speaking, β-type Ti alloys have the best pitting corrosion resistance among the three types of Ti alloys.

scholarly journals Measuring the Efficiency of Football Clubs Using Data Envelopment Analysis: Empirical Evidence From Spanish Professional Football

SAGE Open ◽  
2021 ◽  
Vol 11 (1) ◽  
pp. 215824402198925
Author(s):  
Isidoro Guzmán-Raja ◽  
Manuela Guzmán-Raja
Keyword(s):  
Data Envelopment Analysis ◽  
High Efficiency ◽  
Sport Performance ◽  
Data Envelopment ◽  
Professional Football ◽  
Efficiency Measure ◽  
Factors Affecting ◽  
Football Clubs ◽  
Main Factors ◽  
Using Data

Professional football clubs have a special characteristic not shared by other types of companies: their sport performance (on the field) is important, in addition to their financial performance (off the field). The aim of this paper is to calculate an efficiency measure using a model that combines performance (sport and economic) based on data envelopment analysis (DEA). The main factors affecting teams’ efficiency levels are investigated using cluster analysis. For a sample of Spanish football clubs, the findings indicate that clubs achieved a relatively high efficiency level for the period studied, and that the oldest teams with the most assets had the highest efficiency scores. These results could help club managers to improve the performance of their teams.

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