Results 111 to 120 of about 1,883,484 (166)
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Efficiencies in multiquantum well lasers
Semiconductor Science and Technology, 2002In this work, we analysed the cavity length dependence of the internal, differential and power conversion efficiencies in AlGaAs/GaAs multiquantum well (MQW) lasers. We developed a theoretical model to calculate the threshold current and from it, the corresponding efficiencies.
I Camps, M Sanchez, J C Gonzalez
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An efficient well-specified check
Proceedings 8th International Workshop on Petri Nets and Performance Models (Cat. No.PR00331), 2003A long-standing problem with generalized stochastic Petri nets and extensions is that of what to do when more than one zero-timed event is scheduled to occur at the same time. If the order is left unspecified, it could lead to ambiguity that affects reward variables.
D.D. Deavours, W.H. Sanders
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Maintenance of Well Efficiency
Journal AWWA, 1965This article discusses a study to provide data for a better understanding of the effect of velocity and effective open area. The effect of open area on the rate of flow was considered to be important. Two specimens of continuous‐slot wire‐wrapped screens and two louver‐type screens were used.
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The differential efficiency of quantum-well lasers
IEEE Journal of Selected Topics in Quantum Electronics, 1997We have analyzed the internal differential efficiency of quantum-well lasers in terms of current spreading, carrier injection into the well, and the radiative efficiency within the well. We quantify the first two of these processes by extracting information from spontaneous emission measurements as a function of device length, current, and temperature.
P.M. Smowton, P. Blood
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Factors Affecting Horizontal Well Gravel-Pack Efficiency
Proceedings of SPE Annual Technical Conference and Exhibition, 2006Abstract Four major factors affecting horizontal well gravel pack were studied using a 3D simulator developed for horizontal well gravel packing. The factors included settling effect, gravel concentration, injection rate and carrier fluid viscosity.
K. P. Ojo, S. O. Osisanya, K. B. Ayeni
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Efficient Well-Definedness Checking
2008Formal specifications often contain partial functions that may lead to ill-defined terms. A common technique to eliminate ill-defined terms is to require well-definedness conditions to be proven. The main advantage of this technique is that it allows us to reason in a two-valued logic even if the underlying specification language has a three-valued ...
Ádám Darvas +2 more
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Composites Improve Well Construction Efficiency
SPE Annual Technical Conference and Exhibition, 2009Abstract After cementing a new liner section during wellbore construction, the liner wiper plugs and landing collar must be drilled out to proceed with the next well section. Current conventional aluminum systems produce considerable resistance and wear to drilling equipment resulting in increased effort and time to drill out the ...
Jamie Imhoff +4 more
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Efficiencies of well and through-well detectors to gamma-rays
Nuclear Instruments and Methods in Physics Research, 1984Abstract Total and photopeak efficiency values of well and through-well type detectors have been evaluated for gamma-rays of energies up to 15 MeV. The influence on the calculated values due to the auto-attenuation of the primary beam in the source has been shown.
F. Acanfora +3 more
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Transactions of the AIME, 1935
The importance of a knowledge of the physical laws involved in theproduction of oil from a reservoir has come to be generally realized in recentyears and it is therefore unnecessary to elaborate on the many problems whichstill await complete solution.
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The importance of a knowledge of the physical laws involved in theproduction of oil from a reservoir has come to be generally realized in recentyears and it is therefore unnecessary to elaborate on the many problems whichstill await complete solution.
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Efficient workflow for optimizing well controls
Journal of Petroleum Science and Engineering, 2012Abstract Due to the large dimensionality of typical rate optimization problems, most approaches for field optimization are local search methods. Achievable optima by these methods are directly impacted by the choice of the initial guess for the sought optimal profiles.
Masoud Asadollahi +2 more
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