scholarly journals Structure and viscosity of CaO‐Al 2 O 3 ‐B 2 O 3 ‐BaO slags with varying mass ratio of BaO to CaO

2021 ◽  
Author(s):  
Harishchandra Singh ◽  
Qifeng Shu ◽  
Graham King ◽  
Ziqing Liang ◽  
Zhifeng Wang ◽  
...  
Keyword(s):  
Mass Ratio ◽  
Varying Mass

scholarly journals A Clean and Sustainable Cellulose-Based Composite Film Reinforced with Waste Plastic Polyethylene Terephthalate

2020 ◽  
Vol 2020 ◽  
pp. 1-7
Author(s):  
Airong Xu ◽  
Yongxin Wang ◽  
Xingmin Xu ◽  
Zhihong Xiao ◽  
Rukuan Liu
Keyword(s):  
Mechanical Properties ◽  
Polyethylene Terephthalate ◽  
Chemical Structure ◽  
Environmental Issues ◽  
Waste Plastics ◽  
Mass Ratio ◽  
Thermal Compression ◽  
Waste Plastic ◽  
Compression Treatment ◽  
Varying Mass

With the widespread use and increasing consumption of PET, the amount of waste PET is growing rapidly, and the accompanied environmental problems will become more and more serious. Therefore, the recycling and reuse of PET are of great significance for not only saving resources but also solving environmental issues. In this study, Methylcellulose (MC) composites reinforced with waste plastics polyethylene terephthalate (PET) were prepared by casting an MC/PET solution with a varying mass ratio of MC to PET. Systematic investigations were performed to reveal the effect of the MC/PET mass ratio on the mechanical property, chemical structure, and thermal properties. The resultant findings indicate that the addition of 3% waste plastics PET to MC could notably enhance the tensile strength by about 24% as compared with neat MC. Interestingly, the elongation of the MC/PET composite kept increasing with increasing waste plastics PET. At the same time, thermal compression treatment could also enhance the mechanical properties of the composite. Moreover, the composites also displayed higher thermal stability than MC. In addition, the crystallinity and morphology of the composite were estimated by XRD and SEM.

Synthesis and Characterization of Fe3O4 Nanoparticles Stabilized by Polyvinylpyrrolidone/Polyethylene Glycol with Variable Mass Ratios

2016 ◽  
Vol 869 ◽  
pp. 880-883
Author(s):  
Fernanda A. Sampaio da Silva ◽  
Marcos Flavio de Campos ◽  
Edwin E.G. Rojas
Keyword(s):  
Polyethylene Glycol ◽  
Variable Mass ◽  
Rietveld Analysis ◽  
Polymer Mixture ◽  
Mass Ratio ◽  
X Ray Diffraction ◽  
Cancer Treatments ◽  
Varying Mass ◽  
Good Agreement

Magnetic nanoparticles are devices able to optimize cancer treatments. In particular, magnetite nanoparticles are very effective in producing heat to cause lysis of tumor cells. However, in order that nanoparticles are internalized without causing damage to body they must be coated by biocompatible material. In this work, Fe3O4 nanoparticles were coated by a polymer blend: polyethylene glycol / polyvinylpyrrolidone. Some variations in mass ratio of polymer mixture were made. The effect of varying mass ratio in polymers was investigated. Samples were characterized by X-ray diffraction and Rietveld analysis. Moreover, hysteresis curves were analyzed. The results indicate good agreement between mass proportions used and physical and magnetic properties of nanocomposite.

Effects of Time-Varying Mass on Stability of High-Voltage Conductor in Rain–Wind Condition

2020 ◽  
Vol 15 (5) ◽  
Author(s):  
Chao Zhou ◽  
Jiaqi Yin
Keyword(s):  
High Voltage ◽  
Low Frequency ◽  
Instability Criterion ◽  
Simultaneous Occurrence ◽  
Wind Condition ◽  
Time Varying ◽  
Mass Ratio ◽  
Wind Induced Vibration ◽  
The Impact ◽  
Varying Mass

Abstract Although unanticipated low-frequency vibrations frequently happen on high-voltage conductors under the simultaneous occurrence of wind and rain, the source of these vibrations is not well known. Many studies focus on the impact of rain loads on the high-voltage conductor but very few examine the effects of time-varying mass. Raindrops hitting high-voltage conductors may partially stay on their surface and form rivulets or ridges. As the adhered raindrops may be blown or shaken off, the mass of the rivulets will vary with time. In order to investigate how the time-varying mass of the rivulets affects conductor motion, an analytical model with time-varying mass is established, which leads to the statement of an instability criterion. The vibration characteristics and instability of a high-voltage conductor with fixed and movable rivulet are discussed. The results show that the time-varying mass ratio may affect the peak vibration amplitude, and the unstable zone of the conductor with moveable upper rivulet is much wider than that with fixed upper rivulet, and the rain–wind-induced vibration occurs more easily than Den Hartog galloping. Such comparative studies may prove valuable as they enhance the understanding of the mechanism of the rain–wind induced instability of the high-voltage conductors.

Study on Impurities Removal from Silicon by Slag Refining with Fe (OH)3-SiO2-CaF2 Slag System

2013 ◽  
Vol 815 ◽  
pp. 733-737
Author(s):  
Cheng Hao Lu ◽  
Ming Fang ◽  
Hui Xian Lai ◽  
Liu Qing Huang ◽  
Juan Chen ◽  
...  
Keyword(s):  
Slag System ◽  
Partition Ratio ◽  
Electron Probe Micro Analysis ◽  
Mass Ratio ◽  
Slag Refining ◽  
Photovoltaic Application ◽  
Impurities Removal ◽  
Micro Analysis ◽  
Impurity Elements ◽  
Varying Mass

An innovating slag system, Fe (OH)3-SiO2-CaF2 system, was introduced in the metallurgical methods to purify silicon for photovoltaic application. The partition ratio of boron (LB) between slag and silicon was studied under different mass ratio of slag to silicon and varying mass ratio of Fe (OH)3 to SiO2 under argon condition at 1873K. The distribution of impurity elements in silicon after slag refining was detected by scanning electron scope and electron probe micro analysis. Experimental results illustrated that the Fe-Si binary system could promote the LB. Silicon was surrounded by amorphous slag. Impurity elements are concentrated in slag.

Quantitation in thin Sections Within the Electron Microscope

1976 ◽  
Vol 34 ◽  
pp. 336-337
Author(s):  
J. Edie
Keyword(s):  
Electron Beam ◽  
Electron Microscope ◽  
Electron Scattering ◽  
Volume Density ◽  
Thin Sections ◽  
Faraday Cage ◽  
Local Mass ◽  
Physical Measurements ◽  
Mass Volume ◽  
Varying Mass

In TEM image formation, the observed contrast variations within thin sections result from differential electron scattering within microregions of varying mass thickness. It is possible to utilize these electron scattering properties to obtain objective information regarding various specimen parameters (1, 2, 3).A pragmatic, empirical approach is described which enables a microscopist to perform physical measurements of thickness of thin sections and estimates of local mass, volume, density and, possibly, molecular configurations within thin sections directly in the microscope. A Faraday cage monitors the transmitted electron beam and permits measurements of electron beam intensities.

1351-P: Association of Muscle/Fat Mass Ratio in the First Trimester with Gestational Diabetes Mellitus in Chinese Subjects

Diabetes ◽  
2020 ◽  
Vol 69 (Supplement 1) ◽  
pp. 1351-P
Author(s):  
PING LI ◽  
SHUO LIN ◽  
JIANHUI FAN ◽  
LONGYI ZENG
Keyword(s):  
Diabetes Mellitus ◽  
Gestational Diabetes ◽  
Gestational Diabetes Mellitus ◽  
Fat Mass ◽  
First Trimester ◽  
Mass Ratio ◽  
Chinese Subjects ◽  
Fat Mass Ratio

Effectiveness of Location and Number of Multiple Tuned Mass Damper for Seismic Structures

2020 ◽  
Vol 9 (6) ◽  
pp. 780-783
Keyword(s):  
Seismic Response ◽  
Software Tool ◽  
Tuned Mass Damper ◽  
Structure Study ◽  
Structural Performance ◽  
Mass Ratio ◽  
Tuned Mass Dampers ◽  
Maximum Reduction ◽  
Mass Damper ◽  
Earthquake Data

Tuned mass dampers (TMD) are one of the most reliable devices to control the vibration of the structure. The optimum mass ratio required for a single tuned mass damper (STMD) is evaluated corresponding to the fundamental natural frequency of the structure. The effect of STMD and Multiple tuned mass dampers (MTMD) on a G+20 storey structure are studied to demonstrate the damper’s effectiveness in seismic application. The location and number of tuned mass dampers are studied to give best structural performance in maximum reduction of seismic response for El Centro earthquake data. The analysis results from SAP 2000 software tool shows damper weighing 2.5% of the total weight of the structure effectively reduce the response of the structure. Study shows that introduction of 4-MTMD at top storey can effectively reduce the response by 10% more in comparison to single tuned mass damper. The use of MTMD of same mass ratio that of STMD is more effective in seismic response.

Chitosan-based Magnetic Composites - Efficient Adsorbents for Removal of Pb(II) and Cu(II) from Aqueous Mono and Bicomponent Solutions

2018 ◽  
Vol 69 (9) ◽  
pp. 2323-2330 ◽  
Author(s):  
Daniela C. Culita ◽  
Claudia Maria Simonescu ◽  
Rodica Elena Patescu ◽  
Nicolae Stanica
Keyword(s):  
Aqueous Solutions ◽  
Metal Ions ◽  
Chemical Properties ◽  
Order Kinetic ◽  
Mass Ratio ◽  
Magnetic Adsorbent ◽  
Magnetic Composites ◽  
Initial Ph ◽  
Order Kinetic Model ◽  
Physical And Chemical

A series of three chitosan-based magnetic composites was prepared through a simple coprecipitation method. It was investigated the influence of mass ratio between chitosan and magnetite on the physical and chemical properties of the composites in order to establish the optimum conditions for obtaining a composite with good adsorption capacity for Pb(II) and Cu(II) from mono and bicomponent aqueous solutions. It was found that the microspheres prepared using mass ratio chitosan / magnetite 1.25/1, having a saturation magnetization of 15 emu g--1, are the best to be used as adsorbent for the metal ions. The influence of different parameters such as initial pH values, contact time, initial concentration of metal ions, on the adsorption of Pb(II) and Cu(II) onto the chitosan-based magnetic adsorbent was investigated in details. The adsorption process fits the pseudo-second-order kinetic model in both mono and bicomponent systems, and the maximum adsorption capacities calculated on the basis of the Langmuir model were 79.4 mg g--1 for Pb(II) and 48.5 mg g--1 for Cu(II) in monocomponent systems, while in bicomponent systems were 88.3 and 49.5 mg g--1, respectively. The results revealed that the as prepared chitosan-based magnetic adsorbent can be an effective and promising adsorbent for Pb(II) and Cu(II) from mono and bicomponent aqueous solutions.

ACCURACY RATING MEASUREMENT OF VIBRATION ELECTROMECHANICAL DEVICES

2019 ◽  
Vol 1 (7) ◽  
pp. 42-45
Author(s):  
V. A. Golubkov ◽  
V. F. Shishlakov ◽  
A. G. Fedorenko ◽  
E. Yu. Vataeva
Keyword(s):  
Technical Condition ◽  
Rotor System ◽  
Vibration Measurement ◽  
Random Errors ◽  
Mass Ratio ◽  
Signal Flow Graph ◽  
Bond Graphs ◽  
Rotor Systems ◽  
Electromechanical Devices ◽  
Main Components

Electromechanical devices consist mainly of rotor systems. Vibration is the result of the interaction of the elements of the rotor system and is largely determined by the accuracy of manufacturing elements at the production stage and defects arising in the process of operation. The main components of the rotor systems that affect vibration are bearings. To determine the technical condition of the bearings and the service life of the rotor system, it is necessary to accurately measure the unobservable vibrations of the rotor. The article describes the model of the channel for measuring the vibration of an electromechanical system, built using the apparatus of bond graphs. The transfer function is obtained by analyzing the signal flow graph. The systematic and random errors of vibration measurement are analyzed depending on the mass ratio between the system case and the vibration transducer for various sensor masses and attachment rigidity.

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