Results 41 to 50 of about 9,817 (229)

Vibration Error Correction for the FOGs-Based Measurement in a Drilling System Using an Extended Kalman Filter

open access: yesApplied Sciences, 2021
Fiber-optic gyroscopes (FOGs)-based Measurement While Drilling system (MWD) is a newly developed instrument to survey the borehole trajectory continuously and in real time. However, because of the strong vibration while drilling, the measurement accuracy
Lu Wang   +3 more
doaj   +1 more source

Rheological Characterization and Multi‐Regime Viscosity Modeling of Diluted Polyethylene Mixtures

open access: yesPolymer Engineering &Science, EarlyView.
This study maps the flow behavior of low‐density polyethylene in a recycling solvent from dilute solutions to entangled melts. By integrating time–concentration and time–temperature superposition, and coupling three complementary rheometry methods, a unified semiempirical model accurately predicts steady‐shear viscosity over nine decades of viscosity ...
Johannes Krug   +7 more
wiley   +1 more source

A generalized relation between MWD and relaxation time spectrum

open access: yes, 2008
An inversion procedure for converting linear viscoelastic properties of polymer melts into molecular weight distribution (MWD) described by the generalized exponential function (GEX) has been implemented and applied in a previous work (Cocchini F ...
F. COCCHINI, NOBILE, Maria Rossella
core   +1 more source

Characteristics, properties and limitations of per‐ or polyfluoroalkyl substances (PFASs) and fluoropolymers

open access: yesPolymer International, EarlyView.
An overview and categorization of man‐made per‐ or polyfluoroalkyl substances (PFASs) including low‐molar‐mass and high‐molar‐mass fluorochemicals, and their international regulations is presented. Though certain PFASs are toxic, bioaccumulative and cross the human cellular membranes, others, such as fluoropolymers, are safe, reliable and involved in ...
Bruno Améduri
wiley   +1 more source

Reference Value for the Distance Walked in the Six-Minute Walk Test in Obese Brazilian Men in the Preoperative Period of Bariatric Surgery

open access: yesJournal of Obesity, 2021
Background. Obesity has several effects on the mechanics of the rib cage that may impair the exercise performance of obese individuals and therefore impact the assessment of surgical risk.
Cesar Antonio Luchesa   +5 more
doaj   +1 more source

Mine-used electromagnetic MWD system and its application

open access: yesMeikuang Anquan, 2021
Aiming at the problems of high manufacturing cost and easy damage of communication cable joint in the central cable type drill pipe, which is the cable transmission device for directional drilling in underground coal mine, an electromagnetic measurement ...
GU Lidong, WANG Kaibin, ZHAO Jiajia
doaj   +1 more source

THE VIOLENCE OF FULL COST RECOVERY: Financing Water Infrastructure, and the History and Future of Perpetual Crisis in Mombasa

open access: yesInternational Journal of Urban and Regional Research, EarlyView.
Abstract Foregrounding the role of finance, this article examines the historical production and future trajectory of the urban water crisis in Mombasa. Drawing on archival research and contemporary fieldwork, it traces how principles of full cost recovery—institutionalized during the colonial period and later reworked through postcolonial ...
Joe Williams
wiley   +1 more source

Bismuth Phosphate process under 215 MWD program

open access: yes, 1954
In the Bismuth Phosphate process, 100 tons of 215 MWD uranium can be processed each month using the present equipment. The activation of equipment in spare cells, contemplated process improvements, and transfer piping changes could increase the capacity ...
Browne, W. G., Beaulieu, O. F.
core   +1 more source

Detection of Epistasis for Seed and Some Phytochemical Traits in Coriander under Different Irrigation Regimes

open access: yesAgronomy, 2021
Coriander (Coriander sativum L.) is an annual herb mainly cultivated for its seed characteristics. Drought stress is a major problem which affects coriander behaviour through biochemical responses.
Mehrdad Hanifei   +5 more
doaj   +1 more source

The wider network of social relationships and desistance from crime

open access: yesCriminology, EarlyView.
Abstract Prior research has focused on marriage as a key relationship associated with crime cessation. Yet particularly within the contemporary context, relationships with parents, peers, and other family members may also foster or inhibit progress toward desistance.
Peggy C. Giordano   +4 more
wiley   +1 more source

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