Appraisal of new density coefficient on integrated-nanoparticles concrete in nuclear protection

Kerntechnik ◽  
2020 ◽  
Vol 85 (1) ◽  
pp. 9-14 ◽  
Author(s):  
M. Ashoor ◽  
A. Khorshidi ◽  
L. Sarkhosh
Keyword(s):  
Density Coefficient

Stability Analysis of Moving Printing Web With Sine Half-Wave Variable Density Based on Differential Quadrature Method

2017 ◽  
Vol 139 (6) ◽  
Author(s):  
Jimei Wu ◽  
Mingyue Shao ◽  
Yan Wang ◽  
Qiumin Wu ◽  
Fan Zhao
Keyword(s):  
Flexible Electronics ◽  
Transverse Vibration ◽  
Differential Quadrature Method ◽  
Variable Density ◽  
Differential Quadrature ◽  
Printing Press ◽  
Quadrature Method ◽  
Half Wave ◽  
The Impact ◽  
Density Coefficient

The moving web is widely used to make printing and packaging products, flexible electronics, cloths, etc. The impact of the variable density on printing web dynamic behavior is considered. The density changes in the form of sine half-wave in the lateral direction. Based on the D'Alembert's principle, the transverse vibration differential equation of moving printing web with variable density is established and is discretized by using the differential quadrature method (DQM). The complex characteristic equation is derived. The impacts of the density coefficient and the dimensionless speed on the web stability and vibration characteristics are discussed. The results show that it is feasible to use the DQM to analyze the problem of transverse vibration of printing web with varying density; the tension ratio and the density coefficient have important impacts on the stability of moving printing web. This study provides theoretical guidance and basis for optimizing the structure of printing press and improving the stable working speed of printing press and web.

Appraisal of new density coefficient on integrated-nanoparticles concrete in nuclear protection

Kerntechnik ◽  
2020 ◽  
Vol 85 (1) ◽  
pp. 9-14
Author(s):  
M. Ashoor ◽  
A. Khorshidi ◽  
L. Sarkhosh
Keyword(s):  
Mechanical Properties ◽  
Pore Structure ◽  
Nuclear Reactors ◽  
Density Ratio ◽  
Nuclear Facilities ◽  
Important Material ◽  
Density Coefficient

Abstract The most important material for shielding is concrete in nuclear facilities which performance can be improved by addition some Nanoparticles (NP) at the various concentrations. Nanoparticles, which have a distinctive potential for bio-radiation and shielding of nuclear reactors, are used in many areas due to their special characteristics, which lead to an improvement in the mechanical properties and the pore structure of the concrete shield. The aim of this research was to initiate a novel coefficient (n), experiment to theory density ratio for integrated NP at different nanoparticle concentrations (xnano), established upon purely mathematical viewpoints and some appropriate physical objectives.

scholarly journals Vibration Characteristics for Moving Printing Membrane with Variable Density along the Lateral Direction

2017 ◽  
Vol 2017 ◽  
pp. 1-10 ◽  
Author(s):  
Mingyue Shao ◽  
Jimei Wu ◽  
Yan Wang ◽  
Qiumin Wu ◽  
Yuan Chen
Keyword(s):  
Density Distribution ◽  
Transverse Vibration ◽  
High Speed ◽  
Differential Quadrature Method ◽  
Variable Density ◽  
Vibration Characteristics ◽  
Lateral Direction ◽  
Vibration Model ◽  
The Stability ◽  
Density Coefficient

The vibration model of moving membrane with variable density distribution is established, and the density distribution of the moving membrane varies along the lateral direction. The transverse vibration differential equations of moving membrane are established based on D’Alembert’s principle and discretized by using the differential quadrature method (DQM). The relationships of the first three dimensionless complex frequencies between dimensionless speed, density coefficient, and tension ratio of the membrane are analyzed by numerical calculation. The effects of the density coefficient and the tension ratio on transverse vibration characteristics of the membrane are investigated. The relationship between density coefficient and critical speed is obtained. The numerical results show that the density coefficient and the tension ratio have important influence on the stability of moving membrane. So the study provides a theoretical basis for improving the working stability of the membrane in the high-speed printing process.

Study on Selvage Parameter Based on Silk Fabric Specifications Database

2012 ◽  
Vol 502 ◽  
pp. 159-163 ◽  
Author(s):  
Xi Yang ◽  
Xi Mei Liu ◽  
Xue Ke Sun ◽  
Cen Feng
Keyword(s):  
Theoretical Basis ◽  
Quantitative Relationship ◽  
Silk Fabric ◽  
Technological Parameters ◽  
Silk Fabrics ◽  
Two Parameters ◽  
Fabric Design ◽  
Relationship Of ◽  
Density Coefficient ◽  
Design And Production

Based on the silk fabric specifications database, the paper proposes two technological parameters of selvage tightness coefficient and selvage warp density coefficient, and realizes the quantitative relationship of corresponding parameters between selvage and fabric. By making use of thousands data of silk products in the silk fabric specifications database, corresponding programs are wrote to achieve the automated numeration of various selvage parameters .Then the paper discusses three typical silk fabrics which contains eleven subclasses and analyses the distribution of the two parameters, with the comparison of selvage parameters in sub-categories of the same categories. The conclusion can provide a theoretical basis for the silk fabric design and production.

Orthogonal Experimental Study on Thermal Insulation Mortar Containing Mixed Ceramic Sand and Vitrified Micro Bead Aggregates

2012 ◽  
Vol 450-451 ◽  
pp. 659-662
Author(s):  
Zhi Lling Xie ◽  
Lin Zhu Sun ◽  
Fang Yang
Keyword(s):  
Thermal Conductivity ◽  
Experimental Study ◽  
Compressive Strength ◽  
Thermal Insulation ◽  
High Performance ◽  
Orthogonal Experiments ◽  
Coefficient Of Thermal Conductivity ◽  
Mixed Ceramic ◽  
Relevant Factors ◽  
Density Coefficient

Mixed light aggregates can effectively reduce the coefficient of thermal conductivity of composite materials. Through orthogonal experiments of thermal insulation mortar containing mixed ceramic sand and vitrified micro bead aggregates, we analyzed the law of influence of relevant factors on the dry bulk density, coefficient of thermal conductivity and compressive strength of mortar containing mixed ceramic sand and vitrified micro bead aggregates and provided basic data for further improvement of such thermal insulation mortar so as to promote the development and application of high performance thermal insulation materials.

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