Results 71 to 80 of about 1,134,167 (297)

Virtual reference service as a tool of reference-information servicing of Tomsk State University Research Library

open access: yesБиблиосфера, 2017
Tomsk State University Research Library offers many information-library services. The virtual reference service is designed to carry on users' requests in a remote access mode.
V. D. Schubert
doaj   +1 more source

Wavefunction-based correlated ab initio calculations on crystalline solids

open access: yes, 1999
We present a wavefunction-based approach to correlated ab initio calculations on crystalline insulators of infinite extent. It uses the representation of the occupied and the unoccupied (virtual) single-particle states of the infinite solid in terms of ...
Dolg, Michael   +3 more
core   +1 more source

A Workflow to Accelerate Microstructure‐Sensitive Fatigue Life Predictions

open access: yesAdvanced Engineering Materials, EarlyView.
This study introduces a workflow to accelerate predictions of microstructure‐sensitive fatigue life. Results from frameworks with varying levels of simplification are benchmarked against published reference results. The analysis reveals a trade‐off between accuracy and model complexity, offering researchers a practical guide for selecting the optimal ...
Luca Loiodice   +2 more
wiley   +1 more source

Provision of digital reference services in academic libraries in Kenya: a review

open access: yesRegional Journal of Information and Knowledge Management, 2017
Rationale of the study - The popularity of internet as an avenue of communication and source of information has led to decreasing numbers of in-person reference transaction in academic libraries.
James M. Tutu
doaj  

Absolute height measurement of specular surfaces with modified active fringe reflection photogrammetry [PDF]

open access: yes, 2014
Deflectometric methods have existed for more than a decade for slope measurement of specular freeform surfaces through utilization of the deformation of a sample pattern after reflection from a test surface.
Gao, Feng   +3 more
core   +1 more source

Creating Ti–Fe α/β Alloys by Diffusion‐Driven Solid‐State Processing

open access: yesAdvanced Engineering Materials, EarlyView.
This study proposes making alloys containing fast diffusing elements that are difficult to produce by ingot metallurgy, by diffusion‐driven solid‐state HIP processing of elemental powders and low‐temperature homogenisation. Here, novel Fe‐Ti α–β alloys are formed having fine α–β lamellae, a small β prior grain size without significant intermetallics ...
Jiaqi Xu   +10 more
wiley   +1 more source

Virtual Reference Services: Connecting Users with Experts and Supporting the Development of Skills

open access: yesLiber Quarterly: The Journal of European Research Libraries, 2002
Virtual reference - a service that allows librarians and patrons to communicate with each other in real time through the Internet by e-mail, chat or instant messaging - is currently a hot topic in libraries.
Trix Bakker
doaj   +1 more source

Angular momentum content of a virtual graviton

open access: yes, 2005
We show that a virtual graviton has a J=0 component, which serves to cancel the J=2, J_z=0 component when the graviton is on shell. In contrast, a massive graviton has no J=0 component either on or off shell.
Dicus, Duane, Willenbrock, Scott
core   +1 more source

Solid‐State Diffusion and Intermetallic Phase Formation in Roll‐Bonded Mg–Zn Composites With Kirigami‐Patterned Inlay

open access: yesAdvanced Engineering Materials, EarlyView.
Mg–Zn composites with a thickness of 0.21 mm were fabricated using roll bonding of a kirigami‐patterned Mg alloy inlay within a Zn matrix. Thermal activation following this process led to the formation of tailored intermetallic structures, which provided the composite with enhanced flexural strength.
Yaroslav Frolov   +4 more
wiley   +1 more source

The concept of strong and weak virtual reality

open access: yes, 2006
We approach the virtual reality phenomenon by studying its relationship to set theory, and we investigate the case where this is done using the wellfoundedness property of sets.
A. Baltag   +7 more
core   +1 more source

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