properties of discrete time fourier transform pdf
Báo cáo hóa học: " Research Article Absolute Stability of Discrete-Time Systems with Delay" pdf
Ngày tải lên :
22/06/2014, 06:20
... on the “freezing” technique for discrete- time systems. This method has been
used to investigate properties as well as to the construction of solutions for systems of linear
Rigoberto Medina 3
It ... stability of time- dependent difference equations in Banach
spaces,” Journal of the Institute of Mathematics and Its Applications, vol. 14, no. 3, pp. 335–346, 1974.
11 S. Zhang, “Estimate of total ... majo-
rants. Based on the “freezing” technique to discrete- time systems, we derive explicit conditions for
the absolute stability of the zero solution of such systems.
Copyright q 2008 Rigoberto Medina....
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Các phương pháp xử lý tín hiệu dùng bộ lọc, phương pháp Fourier Transform, STFT( Short Time Fourier Transform)
Ngày tải lên :
01/04/2013, 16:14
... Trong miền tần số: phương pháp Fourier Transform.
- Trong miền thời gian và tần số: STFT( Short Time Fourier Transform) .
2.4.1. Phương pháp Fourier:
2.4.1.1. Biến đổi Fourier:
Cho một hàm f(t) ... triển chuỗi Fourier của F(t)
() ()
=
=
k
tjk
ekFtf
0
(2.18)
vi
() ()
=
2
2
0
1
T
T
tjk
dtetf
T
kF
ã Phân tích liên tục:
PDF created with pdfFactory Pro trial version www.pdffactory.com
... kết thúc của sự
kiện thì Fourier không phát hiện được.
2.4.2. Phương pháp STFT:
Để đạt được một biến đổi Fourier cục bộ, chúng ta có thể định nghĩa một biến đổi
Fourier cửa sổ. Tín hiệu đầu...
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06 Quantization of Discrete Time Signals
Ngày tải lên :
18/10/2013, 04:15
... infinite set of possible signals is converted into a finite set. The next step of encoding maps the
finite set of discrete time, continuous amplitude signals into a finite set of discrete time, discrete
amplitude ... as its domain. A discrete time, continuous amplitude signal
has R as its range. A discrete time, discrete amplitude signal has Z as its range. Here, the focus is
on discrete time signals. Quantization ... discrete time signals. Quantization is the process of approximating any discrete time, continuous
amplitude signal into one of a finite set of discrete time, continuous amplitude signals based on a
particular...
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Tài liệu Báo cáo khoa học: "Reactive Content Selection in the Generation of Real-time Soccer Commentary" pdf
Ngày tải lên :
20/02/2014, 18:20
... terms of efficiency of communication.
2 Principles of Content Selection in
the Real Time Discourse
2.1 Maximization of Total Information
A discourse is most effective when the amount of
information ... effectively address the
problem of
when-to-say
any piece of information.
However, in MIKE we have only an implicit model of
when-to-say.
Rather, a collection of game analysis
modules and ... piece
of information directly affect the importance of the
remaining unuttered comments. To separate these
processes cause significant time delays that would
not be tolerable in our time- critical...
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Báo cáo khoa học: Structure analysis of the flavoredoxin from Desulfovibrio vulgaris Miyazaki F reveals key residues that discriminate the functions and properties of the flavin reductase family pdf
Ngày tải lên :
07/03/2014, 02:20
... compared with those of flavin derivatives. The
retention time of the prosthetic group bound to recom-
binant flavoredoxin was identical to that of FMN
(Fig. S3). The A
448
: A
268
ratio of the holoprotein ... both
of which confer reduction of a flavin by receiving elec-
trons from NADH or NADPH; however, these activi-
ties of flavoredoxin were much lower than those of
A. fulgidus FeR. The FeR activity of ... linear
regression analysis of the logarithms of the concentration
ratios for oxidized and reduced forms of the mediator
versus that of recombinant flavoredoxin.
Reduction titration of flavoredoxin by NAD(P)H
The...
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báo cáo hóa học:" In vivo properties of the proangiogenic peptide QK" pdf
Ngày tải lên :
18/06/2014, 15:20
... http://www.translational-medicine.com/content/7/1/41
Page 6 of 10
(page number not for citation purposes)
Diagram of the kinetics of wound closure (A)Figure 3
Diagram of the kinetics of wound closure (A). VEGF
165
and QK accelerate the closure of ... evalu-
ation of data were performed using GraphPad Prism ver-
sion 5.01 (GraphPad Software, San Diego, California,
USA).
Results
Properties of QK were first assessed in ex vivo experiments
of vascular ... proangiogenic properties of QK,
suggesting that also in vivo this peptide resembles the full VEGF protein. These data open to new
fields of investigation on the mechanisms of activation of VEGF receptors,...
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Báo cáo hóa học: " Moving Target Indication via Three-Antenna SAR with Simplified Fractional Fourier Transform" pdf
Ngày tải lên :
20/06/2014, 22:20
... paper.
2 Simplified Fractional Fourier Transform (FrFT)
The FrFT is a generalizatio n of regular Fourier trans-
form in that the Fourier transform transforms a signal
from time- domain to frequency-domain, ... fractional Fourier transform and time- frequency
representations. IEEE Transactions on Signal Processing 42
(10), 3084–3091
(1992)
21. SC Pei, JJ Ding, Simplified fractional Fourier transform. ... μ)du.
(3)
Given that F is the Fourier transform operator and
F
α
r
is the fractional Fourier transform operator, then the
FrFT possesses the following important properties.
1) Zero rotation:
F
0
r
=...
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Báo cáo hóa học: " Excitonic effects on the second-order nonlinear optical properties of semi-spherical quantum dots" pdf
Ngày tải lên :
21/06/2014, 04:20
... nonlinear
optical properties of semi-spherical quantum dots
Jefferson Flórez
*
and Ángela Camacho
Abstract
We study the excitonic effects on the second-order nonlinear optical properties of semi-spherical ... from few nanometers to tens of nanometers. We find that the second-order nonlinear coefficients exhibit
not only a blue-shift of the order of meV but also a change of intensity compared with the ... eigenstates of
Hamiltonian (8) by a finite elements method for the two
frequencies mentioned above. We have used the soft-
ware COM-SOL Multiphysics, which offers the possibi-
lity of defining...
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Báo cáo hóa học: " Synthesis and Photoluminescence Properties of Porous Silicon Nanowire Arrays" pdf
Ngày tải lên :
21/06/2014, 08:20
... The porosity of
the nanowires is restricted by etchant concentration, etching
time and doping lever of the silicon wafer. The diffusion of
silver ions could lead to the nucleation of silver nanoparti-
cles ... H
2
O
2
concentration of 0.3 M, but different etching times from
30 min to 3 h. The morphology of these SiNWs is sum-
marized in Fig. 2. The variable morphology of the SiNWs
with etching time is similar ... lengths of the
porous SiNWs depend on
a H
2
O
2
concentrations and
b etching times
Nanoscale Res Lett (2010) 5:1822–1828 1825
123
times. As the increase in the H
2
O
2
concentrations or
etching times,...
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báo cáo hóa học:" Research Article Pitch- and Formant-Based Order Adaptation of the Fractional Fourier Transform and Its Application to Speech Recognition" pptx
Ngày tải lên :
21/06/2014, 20:20
... introduced, such as the wavelet transform, the
Wigner-Ville distribution, the Radon-Wigner transform, and
the Fractional Fourier transform.
Fractional Fourier transform, as a new time- frequency
analysis ... take
advantage of the special characteristics of speech. In this
work, we show that the representation of the time- varying
properties of speech may benefit from using the values of
pitch and formants ... and fractional Fourier transform, ” Transactions of
Beijing Institute of Technology, vol. 23, no. 3, pp. 371–377,
2003.
[39] Y. R. Chao, Ed., A Grammar of Spoken Chinese, University of
California...
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Báo cáo hóa học: " Research Article Stabilization of Discrete-Time Control Systems with Multiple State Delays" doc
Ngày tải lên :
21/06/2014, 20:20
... 2, pp. 521–542, 1999.
10 E. K. Boukas, “State feedback stabilization of nonlinear discrete- time systems with time- varying time
delay,” Nonlinear Analysis: Theory, Methods & Applications, ... for discrete- time systems,” IEEE
Transactions on Automatic Control, vol. 41, no. 6, pp. 903–907, 1996.
12 E. N. Chukwu, Stability and Time- Optimal Control of Hereditary Systems, vol. 188 of ... the global
exponential stabilizability of discrete- time systems with time- delayed states. Finally, as an
application, we consider the global stabilization of the nonlinear control systems.
2. Preliminaries
In...
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Báo cáo hóa học: " Symmetry Properties of Single-Walled BC2N Nanotubes" pdf
Ngày tải lên :
22/06/2014, 01:20
... representation. Of these modes,
the ones that transform according to C
t
ẳ A
1
ẩ E
1
ẩ E
2
(the tensor representation) or C
v
are Raman- or IR-active,
respectively. Out of the 12 N modes, four (which transform
as ... T
R2
to a
2
. An example of each
type of BC
2
N nanotubes is given in Fig. 1b–f.
Symmetry of BC
2
N Nanotubes
We first consider the achiral carbon nanotubes with the
rotation axis of order n, i.e., zigzag ... symmetries at the C point of the 12 N (N
is the number of unit cells in the tube and N = n for ZZ-1
BC
2
N nanotubes) of phonons in ZZ-1 BC
2
N nanotubes and
the number of Raman- or IR-active modes,...
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