Fluid Hammer Increases PDC Performance through Axial and Torsional Energy at the Bit

2013 ◽  
Author(s):  
Scott Wesley Powell ◽  
David Herrington ◽  
Benoit Botton ◽  
Bradly S. Ivie
Keyword(s):  
Torsional Energy

Alternative expressions for energies and forces due to angle bending and torsional energy

1992 ◽  
Vol 13 (5) ◽  
pp. 585-594 ◽  
Author(s):  
William C. Swope ◽  
David M. Ferguson
Keyword(s):  
Torsional Energy

scholarly journals Configuration Transitions of Free Circular DNA System Induced by Nicks

2015 ◽  
Vol 2015 ◽  
pp. 1-7
Author(s):  
Chao Ji ◽  
Lingyun Zhang ◽  
Pengye Wang
Keyword(s):  
Physical Mechanism ◽  
Effective Length ◽  
Base Pairs ◽  
Circular Dna ◽  
Force Microscopy ◽  
System A ◽  
Atomic Force ◽  
Torsional Energy ◽  
Dna Base ◽  
Quantitative Results

Nicks have important functions in the biological functions of DNA-mediated systems. However, the configuration transitions of DNA molecules induced by the presence of nicks have not been quantitatively investigated. This study aims to analyze the configuration transitions of free circular DNA system induced by nicks. Using atomic force microscopy, two configuration states were observed in the free circular DNA system with different nick numbers. To understand the transmission of torsional energy among DNA base pairs, we defined the effective length and nicking angle. In the free DNA system, a torsional energy of 233 bp can be completely released by nicks. Based on the experimental and quantitative results, we propose a physical mechanism to explain the configuration transitions of the free circular DNA system induced by nicks. This study and the presented method are very useful in understanding the physical mechanism of nicks in DNA-mediated systems.

Description of ?-Conjugation Effects by Means of Torsional Energy Profiles

ChemInform ◽  
2005 ◽  
Vol 36 (19) ◽  
Author(s):  
J. C. Sancho-Garcia ◽  
A. J. Perez-Jimenez
Keyword(s):  
Energy Profiles ◽  
Torsional Energy

Energy Loss in Gear Tooth Impact

1984 ◽  
Vol 198 (3) ◽  
pp. 205-208
Author(s):  
J D Smith
Keyword(s):  
Energy Loss ◽  
Gear Tooth ◽  
Test Results ◽  
Gear Teeth ◽  
Torsional Energy ◽  
Non Linear ◽  
Gearbox Vibration ◽  
Vibration Problems

Experiments to determine the loss of energy when gear teeth impact are described. The results show much greater loss of torsional energy than expected and an explanation is put forward. The test results are relevant for highly non-linear gearbox vibration problems but cannot be used directly when the teeth remain in contact.

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