Strategies to improve the dynamic levitation performance of superconducting maglevs against force decay and disturbance

2020 ◽  
Vol 127 (19) ◽  
pp. 193907
Author(s):  
Chenguang Huang ◽  
Bin Xu ◽  
Youhe Zhou
Keyword(s):  
Force Decay ◽  
Levitation Performance

scholarly journals The effects of varying alcohol concentrations commonly found in mouth rinses on the force decay of elastomeric chain

2012 ◽  
Vol 82 (5) ◽  
pp. 894-899 ◽  
Author(s):  
Terrah M. Larrabee ◽  
Sean Shih-Yao Liu ◽  
Ariadna Torres-Gorena ◽  
Armando Soto-Rojas ◽  
George J. Eckert ◽  
...  
Keyword(s):  
Mouth Rinses ◽  
Force Decay

scholarly journals An in vitro comparison of the force decay generated by different commercially available elastomeric chains and NiTi closed coil springs

2007 ◽  
Vol 21 (1) ◽  
pp. 51-57 ◽  
Author(s):  
Ana Cristina Soares Santos ◽  
André Tortamano ◽  
Sandra Regina Frazatto Naccarato ◽  
Gladys Cristina Dominguez-Rodriguez ◽  
Julio Wilson Vigorito
Keyword(s):  
Artificial Saliva ◽  
Testing Machine ◽  
In Vitro Study ◽  
Original Length ◽  
Force Decay ◽  
Decay Pattern ◽  
The Mean ◽  
Initial Force ◽  
Elastomeric Chains

This in vitro study was designed to compare the forces generated by commercially available elastomeric chains and NiTi closed coil springs, and to determine their force decay pattern. Forty elastomeric chains and forty NiTi closed coil springs were divided into 4 groups according to the following manufacturers: (1) Morelli®, (2) Abzil®, (3) TP Orthodontics® and (4) American Orthodontics®. The specimens were extended to twice their original length and stored in artificial saliva at 37°C. Initial force was measured by means of an Instron universal testing machine and then at 1, 4, 7, 14, 21, and 28 days. The results revealed that the elastomeric chains delivered a mean initial force of 347 g for Morelli®, 351 g for American Orthodontics®, 402 g for Abzil®, and 404 g for TP Orthodontics®. The NiTi closed coil springs generated a mean initial force of 196 g for American Orthodontics®, 208 g for TP Orthodontics®, 216 g for Abzil®, and 223 g for Morelli®. The mean percentage of force decay observed after 28 days for the elastomeric chains was 37.4% for TP Orthodontics®, 48.1% for American Orthodontics®, 65.4% for Morelli®, and 71.6% for Abzil®. After 28 days, the NiTi closed coil springs presented a mean percentage of force decay of 22.6% for American Orthodontics®, 29.8% for Abzil®, 30.6% for Morelli®, and 45.8% for TP Orthodontics®. At the end of the study, significant differences were observed between the elastomeric chains and the NiTi closed coil springs. The results indicated that the studied NiTi closed coil springs are more adequate for dental movement than the elastomeric chains.

The magnetic levitation performance of YBaCuO bulk at different temperature

2002 ◽  
Vol 378-381 ◽  
pp. 869-872 ◽  
Author(s):  
He Jiang ◽  
Jiasu Wang ◽  
Suyu Wang ◽  
Zhongyou Ren ◽  
Min Zhu ◽  
...  
Keyword(s):  
Magnetic Levitation ◽  
Levitation Performance ◽  
Ybacuo Bulk

scholarly journals Generation I and Generation II Elastomeric Chains Characteristics Comparison in Artificial Saliva Immersion

2020 ◽  
Vol 24 (1) ◽  
Author(s):  
Marisa Icha Aisya Subroto ◽  
Anindita Permata Hardarini Putri ◽  
Leliana Sandra Devi Ade Putri ◽  
Lusi Hidayati
Keyword(s):  
Artificial Saliva ◽  
Orthodontic Force ◽  
Force Decay ◽  
Significant Difference ◽  
Chain Force ◽  
Cie Lab ◽  
Elastomeric Chains ◽  
Research Period ◽  
Color Reader

Objective: To determine the force decay and discoloration in Generation I and Generation II elastomeric chain on artificial saliva immersion. Material and methods: Generation I and Generation II elastomeric chains stretched on an acrylic board and immersed in artificial saliva for 1, 7, 14, 21, and 28 days according to the group of days. On each specified day, the force of each sample measured by an orthodontic force gauge and the magnitude of the force obtained is entered to the formula to find out the force decay in percentage, whereas discoloration of each sample analyzed by the color reader with CIE Lab analysis. Results: The force decay between Generation I and Generation II elastomeric chains showed a statistically significant difference in every group of days, in which Generation II is more effective in maintaining stretch force. Similar to force decay, the discoloration in Generation I elastomeric chains on the 14th day showed significant value and Generation II elastomeric chains were more stable in maintaining color compared to Generation I. Conclusions: over the entire research period time, Generation II elastomeric chains are more stable in maintaining stretch forces and color compared to Generation I elastomeric chains. KEYWORDS Discoloration; Elastomeric chain; Force decay; Generation I; Generation II.

scholarly journals The Effect of Wheat Moisture and Hardness on the Parameters of the Peleg and Normand Model during Relaxation of Single Kernels at Variable Initial Loading

2019 ◽  
Vol 11 (24) ◽  
pp. 7100
Author(s):  
Jawad Kadhim Al Aridhee ◽  
Grzegorz Łysiak ◽  
Ryszard Kulig ◽  
Monika Wójcik ◽  
Marian Panasiewicz
Keyword(s):  
Testing Machine ◽  
Load Level ◽  
Elastic Behavior ◽  
Wheat Varieties ◽  
Wheat Kernel ◽  
Initial Loading ◽  
Force Decay ◽  
Relaxation Experiments ◽  
Initial Force ◽  
Recoverable Energy

The aim of the study was to examine the Peleg and Normand model to characterize the overall stress relaxation behavior of wheat kernel at varying load conditions. The relaxation experiments were made with the help of the universal testing machine, Zwick Z020, by subjecting the samples to compression at four distinct initial load levels, i.e., 20 N, 30 N, 40 N, and 50 N. The measurements were made for four wheat varieties (two soft and two hard-type endosperms) and seven levels of moisture content. Relaxation characteristics were approximated with the help of the Peleg and Normand equation. An interactive influence of the load level, moisture, and wheat hardness on the Peleg and Normand constants has been confirmed. For moist kernels, a higher amount of absorbed compression energy was released, since less energy was required to keep the deformation at a constant level. The constants differed depending on wheat hardness. Higher values of k1 revealed that the initial force decay was slower for hard varieties. This is more characteristic of elastic behavior. Similarly, higher values of k2 pointed to a larger amount of elastic (recoverable) energy at the end of the relaxation. The initial loading level had no or only a slight effect on the model coefficients (Y(t), k1, and k2). The parameters of the Peleg and Normand model decreased with an increase in the water content in the kernels.

Sign in / Sign up

Export Citation Format

Share Document