102,984 research outputs found
DFT and TB study of the geometry of hydrogen adsorbed on graphynes
No full textUsing density-functional calculations (DFT) and a tight-binding model, we investigate the origin of distinct favorable geometries which depend on the type of graphyne used. The change in the H geometry is described in terms of the tuning of the hopping between sp(2)-bonded C atoms and sp-bonded C atoms hybridized with the H atoms. We find that the different preferred geometry for each type of graphyne is associated with the electronic effects due to different symmetries rather than a steric effect minimizing the repulsive interaction between the H atoms. The band gaps are significantly tuned as the hopping varies, except in alpha-graphyne, in agreement with the result of our previous DFT study (Koo J et al 2013 J. Phys. Chem. C 117 11960). Our model can be used to describe the geometry and electronic properties of hydrogenated graphynes
Chalmers Tai Koo Dockyard, Mr And Mrs J C (James Calder), [No Service Number]
No full textThis record was harvested from a previous catalogue system and will be withdrawn in 2025. Information in this record may be superseded or incomplete. Visit this record in UMA's new catalogue at: https://archives.library.unimelb.edu.au/nodes/view/376557Surname: CHALMERS TAI KOO DOCKYARD
Given Name(s) or Initials: MR AND MRS J C (JAMES CALDER)
Military Service Number or Last Known Location: No Service Number
Missing, Wounded and Prisoner of War Enquiry Card Index Number: 12584189545
Item: [2016.0049.08862] "Chalmers Tai Koo Dockyard, Mr And Mrs J C (James Calder), [No Service Number]
[Report to Chief J. E. Curry, by an unknown author #1]
No full textReport to Chief J. E. Curry, by an unknown author. The report contains a list of officers who gave depositions to the United States Attorney
[Report to Chief J. E. Curry, by an unknown author #2]
No full textReport to Chief J. E. Curry, by an unknown author. The report contains a list of officers who gave depositions to the United States Attorney
Impact of Soft Handoff on Received Signal Quality under Imperfect Power Control in CDMA Forward Link
No full text
Cyano-Bridged One- and Two-Dimensional Supramolecular Assemblies Showing Magnetic Couplings
No full textMurder on the mountain: author talk with Peter J. Wosh
No full textAuthor talk by Peter J. Wosh on May 5th, 2022, on his book, "Murder on the Mountain: crime, passion, and punishment in gilded age New Jersey.
The effect of spreading factor in MC-CDMA systems under multi-cell environments in correlated fading channels
No full textEffect of Breathing Characteristics on the Performance in Spark-Ignition Engines
Get PDFAdaptive valve timing control is one of the promising techniques to accomplish the optimized mixture formation and combustion depending on the load and speed, which is needed to meet the future challenges of reducing fuel consumption and exhaust emissions. The behavior and the effect of adaptive valve timing control system has been investigated by computer simulation, which simulates the gas dynamics in engines. These programs are typically one-dimensional including complex flow features as ‘special’ boundaries. A code adopting 2-step Lax-Wendroff method with artificial damping terms called FCT(Flux Corrected Transport), was developed to investigate the influence of operational and design parameters on the performance of engines.
The effects of adaptive valve timing control system on volumetric efficiency or engine torque, and pumping loss were investigated. It increased low end torque by about 6 %, and reduced pumping loss drastically at low load, high engine speed conditions. The pressure pulsation in intake manifold was affected significantly by adjusting valve timings.기계공학전
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