Search results

Search for "fast Fourier transform" in Full Text gives 57 result(s) in Beilstein Journal of Nanotechnology.

Effects of the preparation method on the structure and the visible-light photocatalytic activity of Ag2CrO4

  • Difa Xu,
  • Shaowen Cao,
  • Jinfeng Zhang,
  • Bei Cheng and
  • Jiaguo Yu

Beilstein J. Nanotechnol. 2014, 5, 658–666, doi:10.3762/bjnano.5.77

Graphical Abstract
  • fringes with d spacings of 0.503 and 0.288 nm, which can be assigned to the (020) and (220), respectively, crystal planes of orthorhombic Ag2CrO4. The corresponding fast Fourier transform (FFT) image suggests a single-crystalline nature. This also indicates that the S-M sample is well-crystallized
PDF
Album
Full Research Paper
Published 19 May 2014

Challenges and complexities of multifrequency atomic force microscopy in liquid environments

  • Santiago D. Solares

Beilstein J. Nanotechnol. 2014, 5, 298–307, doi:10.3762/bjnano.5.33

Graphical Abstract
  • the fast Fourier transform to the results shown in (b). Typical eigenmode responses for bimodal and trimodal AFM operation in air with Q1 = 150, Q2 = 450, Q3 = 750, ν1 = 70 kHz, ν2 = 437.5 kHz, ν3 = 1.25 MHz and k1 = 2 N/m: (a) bimodal operation with A1 = 100 nm and A2 = 10 nm (A1/A2 = 10); (b
PDF
Album
Full Research Paper
Published 14 Mar 2014

Dye-doped spheres with plasmonic semi-shells: Lasing modes and scattering at realistic gain levels

  • Nikita Arnold,
  • Boyang Ding,
  • Calin Hrelescu and
  • Thomas A. Klar

Beilstein J. Nanotechnol. 2013, 4, 974–987, doi:10.3762/bjnano.4.110

Graphical Abstract
  • σab. The extinction cross section is always defined as σex = σsc + σab, irrespectively of the sign of σab. Far-field patterns are calculated by the internal CST routines, which project the fields on the sides of the bounding box into the far-fields via fast Fourier transform. Adaptive meshing is a
PDF
Album
Full Research Paper
Published 30 Dec 2013

A facile synthesis of a carbon-encapsulated Fe3O4 nanocomposite and its performance as anode in lithium-ion batteries

  • Raju Prakash,
  • Katharina Fanselau,
  • Shuhua Ren,
  • Tapan Kumar Mandal,
  • Christian Kübel,
  • Horst Hahn and
  • Maximilian Fichtner

Beilstein J. Nanotechnol. 2013, 4, 699–704, doi:10.3762/bjnano.4.79

Graphical Abstract
  • bare Fe3O4 nanoparticles could also be observed (Figure S2 in Supporting Information File 1). Fast Fourier transform (FFT) analysis of various HRTEM images (of crystallites located inside or outside of carbon shells, see Figure S3 in Supporting Information File 1) reveal that the observed lattice
PDF
Album
Supp Info
Letter
Published 30 Oct 2013

Polynomial force approximations and multifrequency atomic force microscopy

  • Daniel Platz,
  • Daniel Forchheimer,
  • Erik A. Tholén and
  • David B. Haviland

Beilstein J. Nanotechnol. 2013, 4, 352–360, doi:10.3762/bjnano.4.41

Graphical Abstract
  • approximates the inverse in a least-squares sense. The matrix can be rapidly computed from Equation 16 using the Fast Fourier Transform (FFT) algorithm. Therefore, Equation 19 provides an efficient way to determine the expansion coefficients of the the tip–surface force. However, special care should be taken
PDF
Album
Supp Info
Full Research Paper
Published 10 Jun 2013

Towards 4-dimensional atomic force spectroscopy using the spectral inversion method

  • Jeffrey C. Williams and
  • Santiago D. Solares

Beilstein J. Nanotechnol. 2013, 4, 87–93, doi:10.3762/bjnano.4.10

Graphical Abstract
  • calculate its spectrum, Zp(ω), through application of the fast Fourier transform to a sequence of values of zp(t) recorded at regular intervals. Additionally, one can also obtain the spectrum of the driving force by rewriting Equation 2 as Next, one can apply the inverse fast Fourier transform to Fd(ω) in
PDF
Album
Full Research Paper
Published 07 Feb 2013

Structural, electronic and photovoltaic characterization of multiwalled carbon nanotubes grown directly on stainless steel

  • Luca Camilli,
  • Manuela Scarselli,
  • Silvano Del Gobbo,
  • Paola Castrucci,
  • Eric Gautron and
  • Maurizio De Crescenzi

Beilstein J. Nanotechnol. 2012, 3, 360–367, doi:10.3762/bjnano.3.42

Graphical Abstract
  • degree of the synthesized nanostructures is evidenced in the inset of Figure 3b, in which the reported Fast Fourier Transform of the TEM image consists of two single points located at 0.35 nm from the centre. In Figure 4 we report the carbon core-valence-valence (CVV) Auger features for HOPG and a MWCNT
  • -resolution TEM image assessing the multiwalled nature of the carbon nanotubes synthesized on SS. (b) High-resolution TEM picture of a single MWCNT with 19 walls. The inset displays the Fast Fourier Transform of the TEM image reported in (b). The two spots, at a semidistance of 0.35 nm, represent the parallel
PDF
Album
Full Research Paper
Published 02 May 2012
Other Beilstein-Institut Open Science Activities