Results 241 to 250 of about 133,825 (302)

Naphthyridine‐Based Donor–Acceptor Boron Difluoride Complexes Targeting Red Emission in Organic Light‐Emitting Diodes

Advanced Optical Materials, EarlyView.
Four donor–acceptor boron difluoride complexes based on triphenylamine donor and a naphthyridine acceptor units were synthesized, studied, and applied as OLED emitters. They exhibit pronounced intramolecular charge transfer character, balanced charge transport properties, and tunable emission. Near‐unity PLQYs are achieved for selected compounds, while
Omar Lahna, Stepan Kutsiy, Dmytro Volyniuk, Roman Luboradzki, Elina Andresen, Ute Resch‐Genger, Juozas V. Grazulevicius, Pavlo Stakhira, Mykhaylo A. Potopnyk   +8 more
wiley   +1 more source

Harnessing Ultrafast Optical Pulses for 3D Microfabrication by Selective Tweezing and Immobilization of Colloidal Particles in an Integrated System

Advanced Photonics Research, Volume 6, Issue 5, May 2025.
Microfabrication using nano‐ to micron‐sized blocks has transformative potential for next‐gen electronics, optoelectronics, and materials. Traditional methods are limited by scalability and precision. STIC, a single‐laser system for precise colloid manipulation and immobilization using femtosecond lasers, is introduced that enables efficient 3D ...
Krishangi Krishna, Jieliyue Sun, Wenyu Liu, Robert H. Hurt, Kimani C. Toussaint Jr.   +4 more
wiley   +1 more source

A Critique of the United States Income and Product Accounts [PDF]

Joseph Lerner
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Measurement-While-Drilling Instrument Based on Predigested Inertial Measurement Unit

IEEE Transactions on Instrumentation and Measurement, 2012
This paper developed a measurement-while-drilling instrument based on predigested inertial measurement unit (PIMU) and presented a PIMU design with a rotational modulation device, thus improving precision of inertial sensors. Then, this paper proposed an integral surveying method based on inertial navigation system and dead reckoning, measuring motion ...
Yanshun Zhang, Shuwei Wang, Jiancheng Fang   +2 more
openaire   +3 more sources

Applications of Measurements While Drilling

SPE Annual Technical Conference and Exhibition, 1981
ABSTRACT A Measurement While Drilling (MWD) system is now available to provide more downhole measurements than ever before. The measurements currently made near the bit, while drilling is in progress, include: formation radioactivityformation resistivityannular temperaturedownhole weight on bithole deviationazimuthtool face angle
D.R. Tanguy, W.A. Zoeller
openaire   +1 more source

Bottomhole Pressures Measured While Drilling

IADC/SPE Drilling Conference, 1983
Abstract Recent in-situ measurements show that major discrepancies exist between accurately measured net bit pressure drop values and those predicted by previously accepted models and equations. The direction of the discrepancies is such that the measured values of net bit pressure drop are 20 per cent lower than those predicted by the ...
M. S. Ramsey, L. H. Robinson, J. F. Miller, M. E. Morrison   +3 more
openaire   +2 more sources

Measuring Skin While Drilling

SPE Production Operations Symposium, 1995
Abstract A new model is proposed to characterize the variation in skin effect along a horizontal well. Typically, a cylindrical-shaped damaged region is assumed; however, this work describes the damaged region as a combination cylindrical-conical shape.
Thomas W. Engler, Samuel Osisanya, Djebbar Tiab   +2 more
openaire   +1 more source

Directional Measurements While Drilling

SPE Annual Technical Conference and Exhibition, 2019
Abstract Real-time downhole estimation of inclination and azimuth is desirable for improved wellbore quality, better management of the drilling process with regard to wellbore hydraulics and drilling dynamics, and is a prerequisite for advanced directional drilling services such as downhole azimuthal hold mode and surface-based automated
Kai Karvinen, Oliver Hoehn, Steffen Schulze, Ingolf Wassermann   +3 more
openaire   +1 more source

Reducing Uncertainty With Seismic Measurements While Drilling

IEEE Transactions on Instrumentation and Measurement, 2010
This paper discusses both seismic checkshot data inversion and seismic waveform look-ahead imaging while drilling. We investigate the estimation under real-time data uncertainties of interval velocity profiles calculated from checkshot measurements acquired while drilling.
Hugues Djikpesse, Phil Armstrong, Rogelio Rufino, Andy Hawthorn   +3 more
openaire   +1 more source

Electromagnetic Measurements While Drilling: a Telemetry Solution for Casing-While-Drilling.

SPE Asia Pacific Oil and Gas Conference and Exhibition, 2012
Abstract Casing-while-drilling (CWD) operations have become a well-known technology used to minimise drilling time and reduce AFE budget. PETRONAS has drilled several wells in Malaysia by using this technology, and it has proven to be a cost efficient strategy particularly in batch drilling process.
M Zarir Musa, Dian Semesta Bt Abdul Aziz, Trigunadi Budi Setiawan, Heru Hermawan, Ilen Kardani, Mohd Azlan Askar Ali, Rosli Sidek   +6 more
openaire   +1 more source