Results 111 to 120 of about 6,935 (243)

Pre‐Task Explicit Instruction, Input Modality, and Working Memory in L2 Oral Self‐Repair

International Journal of Applied Linguistics, EarlyView.
ABSTRACT Despite the central role of tasks in language education and ensuing research documenting how task‐related variables might affect language performance and learning, it remains unclear whether pre‐task explicit instruction, input modality, and working memory (WM) influence how learners monitor and repair grammatical structures in real‐time ...
Reza Yadollahpour, Mostafa Pourhaji, Michael Sadeghi   +2 more
wiley   +1 more source

String field theoryะ Time evolution and T-duality [PDF]

, 2005
The time evolution operator of quantum field theory (Schrödinger functional) can be written in terms of particles moving on S(^1)/Z(_2-). By deriving the 'gluing property’ which joins two propagators across fixed time surfaces, we show that the Feynman ...
Liderton, Anton
core  

T-duality invariant approaches to string theory

, 2010
PhDThis thesis investigates the quantum properties of T-duality invariant formalisms of String Theory. We introduce and review duality invariant formalisms of String Theory including the Doubled Formalism.
Thompson, Daniel C, Thompson, Daniel C.
core  

The enhancon mechanism in string theory [PDF]

, 2002
The enhancon mechanism is a specific phenomenon in string theory which resolves a certain naked spacetime singularity arising in the supergravity description related to N = 2 supersymmetric pure gauge theory.
Järv, Laur
core  

Polymict melt‐bearing breccia dikes in the Morokweng impact structure formed by slip‐induced mechanical mixing of pseudotachylite and cataclasite along large‐displacement impact faults

Meteoritics &Planetary Science, EarlyView.
Abstract A core drilled through shocked and faulted Archean granitoid gneisses and dolerites in the eroded peak ring of the 70–80 km diameter Morokweng impact structure intersects multiple centimeter‐ to meter‐wide clastic‐matrix breccias containing a polymict clast population of lithic and mineral clasts and altered, millimeter‐ to centimeter ‐size ...
Roger L. Gibson, S'lindile S. Wela, Leonidas C. Vonopartis, Marco A. G. Andreoli   +3 more
wiley   +1 more source

Numerical Investigation of the Nonlinear Drill String Dynamics Under Stick–Slip Vibration

Vibration
This paper presents a comprehensive analysis of the influence of rotary table velocity, weight-on-bit, and viscous damping on the drill string stick–slip vibration.
Mohammad Javad Moharrami, Hodjat Shiri, Clóvis de Arruda Martins   +2 more
doaj   +1 more source

Study on Nonlinear Dynamics Collision of Drill String and Rock Based on ANSYS/LS-DYNA

, 2011
In the process of drilling well, the kinematics of drill string is quite complicated. The drill string not only vibrates in longitudinal, transverse and torsional direction, but also random impacts and contacts well wall.
Shang Yu Yang, Xiu Juan Yang, Xiang Zhen Yan   +2 more
core   +1 more source

Methods for assessing problem‐solving competencies in preschoolers: A scoping review

Review of Education, Volume 14, Issue 2, August 2026.
Abstract Problem‐solving is an important 21st‐century skill and an indispensable part of early STEM (science, technology, engineering and mathematics) education. To effectively study the development of children's problem‐solving competencies and to evaluate the effectiveness of classroom interventions and programmes, researchers and educators need ...
Joris Van Elsen, Sven De Maeyer, Joke Torbeyns   +2 more
wiley   +1 more source

Shaping expectations, losing flexibility: A study of CEO promises as strategic communication tools

Strategic Management Journal, Volume 47, Issue 7, Page 1980-2061, July 2026.
Abstract Research Summary CEO promises are powerful but understudied communication tools. We develop a dual‐mechanism framework theorizing that while CEO promises elevate stakeholder expectations, they simultaneously constrain strategic flexibility. We argue that CEO promise‐making is shaped by two competing pressures: making more promises when the ...
Majid Majzoubi, Alex Murray, William J. Mayew   +2 more
wiley   +1 more source

Study on Dynamic Characteristics of drill String-drill Bit-rock System

Shiyou jixie, 2017
Drill bit, drill string and rock system as a whole, has coupled and interacted dynamic characteristics, which is neglected in most of researches. In view of this, considering the coupling of axial and lateral torsion of the lower drilling tool and the ...
Hu Zhiqiang, Zhu Xiaohua, Hao Jun, Yao Jiaxin   +3 more
doaj