نتایج جستجو برای: spectroscopy fourier transform infrared

تعداد نتایج: 360719  

In this paper functionalized multiwall carbon nanotubes (FMWCNT) were modified using doxycycline, containing reactable nitrogen, which can attach chemically to functionalized MWCNT. The synthesized nano compounds were characterized by Fourier transform infrared spectroscopy (FT-IR) and Raman spectroscopy. These spectrums proved the existence of nitrogen atoms of amide functional groups. The mor...

Abolghasem Shameli Bahram Pourhasan

1, 4-Diazabicyclo [2.2.2] octane (DABCO) was employed as a catalyst for one-pot synthesis of pyrano[2,3-d] pyrimidinone derivatives and MWNT- pyrimidinones from condensation reactions of aromatic aldehydes, malononitrile and thiobarbituric acid and MWNT-COCl . This method delivers the advantages of a simple method, environment friendly procedure, mild reaction conditions and high returns. The m...

2011
Fredrik Larsson Michael Felsberg Per-Erik Forssén

The Fourier descriptors (FDs) is a classical but still popular method for contour matching. The key idea is to apply the Fourier transform to a periodic representation of the contour, which results in a shape descriptor in the frequency domain. Fourier descriptors are most commonly used to compare object silhouettes and object contours; we instead use this well established machinery to describe...

1999
Bongsoo Kim Keitaro Yoshihara

Alkali metal dimers are very suitable for studying the perturbations and photodissociation dynamics of excited states, since they have many electronic states which absorb light from the near-infrared to ultraviolet region and some of the excited states predissociate to produce excited atoms.‘” The spectroscopy of alkali dimers has recently attracted renewed interest as they are possible candida...

Journal: :Journal of the American Chemical Society 2003
Seho Kim Thomas Szyperski

Widely used higher-dimensional Fourier transform (FT) NMR spectroscopy suffers from two major drawbacks: (i) The minimal measurement time of an N-dimensional FT NMR experiment, which is constrained by the need to sample N - 1 indirect dimensions, may exceed by far the measurement time required to achieve sufficient signal-to-noise ratios. (ii) The low resolution in the indirect dimensions sever...

2011
Mawardi BAHRI Sriwulan ADJI Ji Man ZHAO

We study the windowed Fourier transform in the framework of Clifford analysis, which we call the Clifford windowed Fourier transform (CWFT). Based on the spectral representation of the Clifford Fourier transform (CFT), we derive several important properties such as shift, modulation, reconstruction formula, orthogonality relation, isometry, and reproducing kernel. We also present an example to ...

2015
H De Bie

In this paper we elaborate upon the investigation initiated in [3] of typical and distinctive properties of the Fourier transform (FT), in particular the crucial role played by the Howe dual pair (O(m), sl2). We prove in detail a result on the unique characterization of the FT making extensive use of a representation of the Lie algebra sl2. As an example, we consider the case m = 1. We refer to...

Journal: :Journal of clinical microbiology 2001
C Kirschner K Maquelin P Pina N A Ngo Thi L P Choo-Smith G D Sockalingum C Sandt D Ami F Orsini S M Doglia P Allouch M Mainfait G J Puppels D Naumann

Rapid and accurate identification of enterococci at the species level is an essential task in clinical microbiology since these organisms have emerged as one of the leading causes of nosocomial infections worldwide. Vibrational spectroscopic techniques (infrared [IR] and Raman) could provide potential alternatives to conventional typing methods, because they are fast, easy to perform, and econo...

2013
Juan M. Bueno Raquel Palacios Mary K. Chessey Harilaos Ginis

The spatial organization of stromal collagen of ex-vivo corneas has been quantified in adaptive-optics second harmonic generation (SHG) images by means of an optimized Fourier transform (FT) based analysis. At a particular depth location, adjacent lamellae often present similar orientations and run parallel to the corneal surface. However this pattern might be combined with interweaved collagen...

2009
DANIEL BELEGA DOMINIQUE DALLET DAN STOICIU Daniel Belega Dominique Dallet Dan Stoiciu

In this paper a criterion for optimal choice of the maximum sidelobe decay window used in the interpolated discrete Fourier transform (IpDFT) method for estimating the parameters of a sine-wave is proposed. The window chosen by the proposed criterion is the window with the lowest order, which ensures that the systematic errors that affect the sine-wave parameters estimates are very small compar...

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