Multipurpose propulsion unit for space maintenance

1965 ◽  
Author(s):  
P. VAN SCHAIK
Keyword(s):  
Space Maintenance ◽  
Propulsion Unit

scholarly journals Functional Band and Loop Space Maintainers in Children

2019 ◽  
Vol 2019 ◽  
pp. 1-4
Author(s):  
V. Vinothini ◽  
A. Sanguida ◽  
A. Selvabalaji ◽  
G. S. Prathima ◽  
M. Kavitha
Keyword(s):  
Clinical Application ◽  
Loop Space ◽  
Single Tooth ◽  
Space Maintainer ◽  
Space Maintenance ◽  
Band And Loop

Premature loss of teeth in children leads to space loss and affects arch integrity. The band and loop space maintainer is used in majority of patients requiring single tooth space maintenance in both primary and mixed dentitions. It preserves the proximal dimensions, but it is nonfunctional. This paper describes a method to modify the conventional band and loop space maintainer into a functional one and reports its clinical application and follow-up in five children.

scholarly journals Analytical Modeling and Design of Novel Conical Halbach Permanent Magnet Couplings for Underwater Propulsion

2021 ◽  
Vol 9 (3) ◽  
pp. 290
Author(s):  
Yukai Li ◽  
Yuli Hu ◽  
Youguang Guo ◽  
Baowei Song ◽  
Zhaoyong Mao
Keyword(s):  
Permanent Magnet ◽  
Analytical Calculation ◽  
Underwater Propulsion ◽  
Conical Structure ◽  
Torque Analysis ◽  
Dynamic Seal ◽  
And Performance ◽  
The Stability ◽  
Propulsion Unit ◽  
Force Calculation

Permanent magnet couplings can convert a dynamic seal into a static seal, thereby greatly improving the stability of the underwater propulsion unit. In order to make full use of the tail space and improve the transmitted torque capability, a conical Halbach permanent magnet coupling (C-HPMC) is proposed in this paper. The C-HPMC combines multiple cylindrical HPMCs with different sizes into an approximately conical structure. Compared with the conical permanent magnet couplings in our previous work, the novel C-HPMC has better torque performance and is easy to process. The analytical calculation method of transmitted torque of C-HPMC is proposed on the basis of torque calculation of the three common types of HPMCs. The accuracy of the torque calculation of the three HPMCs is verified, and the torque performance of the three HPMCSs of different sizes is compared and discussed. The “optimal type selection” method is proposed and applied in the design of C-HPMC. Finally, on the basis of torque analysis calculation and axial force calculation, a complete flowchart of the design and performance analysis of C-HPMC is described.

scholarly journals Manufacture of a weakly denatured collagen fiber scaffold with excellent biocompatibility and space maintenance ability

2013 ◽  
Vol 8 (4) ◽  
pp. 045010 ◽  
Author(s):  
A Nakada ◽  
K Shigeno ◽  
T Sato ◽  
T Kobayashi ◽  
M Wakatsuki ◽  
...  
Keyword(s):  
Collagen Fiber ◽  
Space Maintenance

Propulsion Unit Control Method for Visualization of Grasping State of Earthworm-type Lunar Excavation Robot

2021 ◽  
Author(s):  
R. Tokoi ◽  
W. Toyama ◽  
T. Watanabe ◽  
K. Tsumura ◽  
M. Okui ◽  
...  
Keyword(s):  
Control Method ◽  
Propulsion Unit

scholarly journals Material Origins of Accelerated Operational Wear of RD-33 Engine Blades

2020 ◽  
Author(s):  
Adam Kozakiewicz ◽  
Stanislaw Jóźwiak ◽  
Przemysław Jóźwiak ◽  
Stanisław Kachel
Keyword(s):  
Chemical Composition ◽  
Construction Material ◽  
Operating Conditions ◽  
Design Stage ◽  
Strength Analysis ◽  
Jet Engine ◽  
Emergency Situations ◽  
Low Pressure Turbine ◽  
Propulsion Unit ◽  
Selection Of

The structural and strength analysis of the material used to construct such an important engine element as the turbine is of great significance, both at the design stage as well as during tests and expertises related to emergency situations. Bearing in mind the conditions above mentioned, the paper presents the results of research on the chemical composition, morphology and phased structure of the metallic construction material used to produce the blades of the high and low pressure turbine of the RD-33 jet engine, which is the propulsion unit of the MiG-29 aircraft. The data obtained as a result of the material tests of the blades allowed, on the basis of the analysis of chemical composition and phased structure, to determine the grade of the alloy used to construct the tested elements of the jet engine turbine. The structural stability of the material was found to be lower in comparison with engine operating conditions, which manifested itself as a clear decrease in the resistance properties of the blade material. The results obtained can be used as a basis for analyzing the life span of an object or a selection of material replacements, which enable to produce the analyzed engine element.

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