Results 11 to 20 of about 10,717 (265)
Effects of cosmic string velocities and the origin of globular clusters [PDF]
Journal of Cosmology and Astroparticle Physics, 2015 8 pages, 5 ...
Lin, Ling +2 more
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Peculiar Velocities and Microwave Background Anisotropies from Cosmic Strings [PDF]
The Astrophysical Journal, 1994 (revised version) 13 pages plus 1 figure available upon request.
Perivolaropoulos, Leandros +1 more
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On the group velocity of guided waves in drill strings
The Journal of the Acoustical Society of America, 2001 A key element to verify the drill-bit signal processing is the estimation of the time delay of the guided waves transmitted through the drill string from the bit to the surface. This delay can be measured from drill-bit vibrations or calculated using the mechanical properties of the drill string.
Poletto, Flavio, Carcione, José M.
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Statistics of peculiar velocities from cosmic strings [PDF]
Monthly Notices of the Royal Astronomical Society, 1995 We calculate the probability distribution of a single component of peculiar velocities due to cosmic strings, smoothed over regions with a radius of several $h^{-1}$ Mpc. The probability distribution is shown to be Gaussian to good accuracy, in agreement with the distribution of peculiar velocities deduced from the 1.9 Jy IRAS redshift survey.
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Stick–Slip Vibration Characteristics Study of the Drill String Based on PID Controller
Energies, 2023 In order to address the issue of drill string stick–slip vibration, which leads to drill bit wear and reduces the drilling velocity, we conducted a study on the characteristics of stick–slip vibration using a proportional-integral-derivative (PID ...
Baoyong Yan +3 more
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Velocity distribution for strings in phase-ordering kinetics [PDF]
Physical Review E, 1999 19 pages, 0 ...
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Generalized velocity-dependent one-scale model for current-carrying strings [PDF]
Physical Review D, 2021 We develop an analytic model to quantitatively describe the evolution of superconducting cosmic string networks. Specifically, we extend the velocity-dependent one-scale (VOS) model to incorporate arbitrary currents and charges on cosmic string worldsheets under two main assumptions, the validity of which we also discuss.
C. J. A. P. Martins +3 more
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Integral Hoisting Remote Control Heavy Load Tower for Coiled Tubing Operation
Shiyou jixie, 2021 When the velocity string operation was carried out in South Sulige Block, the existing tower could not meet the requirements of field construction, therefore, the integral hoisting remote control heavy load tower was developed.
Liu Pingguo +6 more
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Journal of High Energy Physics, 2020 We compute holographically the energy loss of a moving quark in various states of the D1-D5 CFT. In the dual bulk geometries, the quark is the end of a trailing string, and the profile of this string determines the drag force exerted by the medium on the
Iosif Bena, Alexander Tyukov
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Shiyou jixie, 2020 It has been found in practice that the production of many gas wells has decreased after running the velocity string. To explain this phenomenon, firstly, using the 65 well-time velocity string flow pressure test data reported in the public literature ...
Liu Tong, Zhu Jiang, Lu Zhiming
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