fourier transform infrared studies
Báo cáo khoa học: Light-induced reactions of Escherichia coli DNA photolyase monitored by Fourier transform infrared spectroscopy pot
Ngày tải lên :
16/03/2014, 18:20
... (Fig 1) This paper describes the first examination of DNA photolyase by Fourier transform infrared (FT-IR) spectroscopy Specific infrared bands observed in difference FT-IR spectra are assigned to ... spectroscopy Infrared spectra of 1.2-mm solutions of blue radical enzyme were measured at °C in the dark The enzyme samples were then irradiated for with red light (k > 530 nm) Infrared spectra ... was used to irradiate a 4-mm solution of oligothymidine placed inside the infrared spectrometer The subtraction of an infrared spectrum acquired prior to UV-irradiation from a spectrum obtained...
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báo cáo hóa học:" Fourier-transform infrared anisotropy in cross and parallel sections of tendon and articular cartilage" pptx
Ngày tải lên :
20/06/2014, 01:20
... indicates the tissue degradation in advance Recent studies of cartilage using Fourier- Transform Infrared Imaging (FTIRI) [12-19] show that infrared techniques with imaging capability have the ... proteoglycan in cartilage sections using Fourier transform infrared spectral imaging Arth Rheum 2001, 44:846-855 Wetzl DL, Post GR, Lodder RA: Synchrotron infrared microspectroscopic analysis of ... 2005, 38:53-59 West PA, Bostrom MPG, Torzilli PA, Camacho NP: Fourier Transform Infrared Spectral Analysis of Degenerative Cartilage: An Infrared Fiber Optic Probe and Imaging Study Appl Spectosc...
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báo cáo hóa học:" Analysis of ovarian tumor pathology by Fourier Transform Infrared Spectroscopy" pdf
Ngày tải lên :
20/06/2014, 07:20
... anticancer drug investigations [20-22], cancer grading (14), and studies on nucleic acid from tumor cells [23] Fourier transform infrared spectroscopy has Page of been extensively employed in the ... optics and FT-Raman spectroscopic studies for the diagnosis of cancer Am Clin Lab 2000, 19:20 14 Andrus PG, Strickland RD: Cancer grading by Fourier transform infrared spectroscopy Biospectroscopy ... Tyagi G, Jangir DK, Singh P, Mehrotra R: DNA interaction studies of an anti-cancer plant alkaloid vincristine using Fourier transform infrared spectroscopy DNA Cell Biol 2010, 29(11):693-699...
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Fourier transformed infrared absorption spectroscopy and kinetics studies of gas phase small molecules
Ngày tải lên :
15/09/2015, 17:11
... understanding the kinetics of elementary gas-phase reactions of small molecules using Fourier- Transformed Infrared (FTIR) absorption techniques The small molecules investigated here are deemed ... cm3 molecule-1 s-1 and kOCSe = (2.4± 0.3) × 10-11 cm3 molecule-1 s-1 at 301-303K using Fourier- Transformed Infrared (FTIR) absorption spectroscopy The measurements have been accomplished by calibrating ... 10-13 cm3 molecule-1s-1 Stable products formed during the reactions have been detected by Fourier- Transform Infrared (FTIR) Absorption Spectroscopy The reaction of Cl(2P3/2) and CF3CH2OH has the...
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The Discrete Fourier Transform
Ngày tải lên :
13/09/2012, 09:49
... term: transform, is extensively used in Digital Signal Processing, such as: Fourier transform, Laplace transform, Z transform, Hilbert transform, Discrete Cosine transform, etc Just what is a transform? ... Discrete Time Fourier Transform in a computer algorithm By elimination, the only Chapter 8- The Discrete Fourier Transform Type of Transform 145 Example Signal Fourier Transform signals that ... of Fourier Transform is sometimes called the Discrete Fourier Series, but is most often called the Discrete Fourier Transform You might be thinking that the names given to these four types of Fourier...
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Fourier Transform Properties
Ngày tải lên :
13/09/2012, 09:49
... called frequency domain multiplexing The Discrete Time Fourier Transform The Discrete Time Fourier Transform (DTFT) is the member of the Fourier transform family that operates on aperiodic, discrete ... examples of how the complex conjugate is used in DSP If x[ n ] has a Fourier transform of X [f ] , then x [& n ] has a Fourier transform of X t[f ] In words, flipping the time domain left-for-right ... other, and vice versa For continuous signals, if X (f ) is the Fourier Transform of x( t) , then 1/k × X( f/ k) is the Fourier Transform of x(k t) , where k is the parameter controlling the expansion...
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Fourier Transform Pairs
Ngày tải lên :
13/09/2012, 09:49
... allows the duality property to be more symmetrical For instance, Figs (d), (e), and Chapter 11- Fourier Transform Pairs Time Domain 211 Frequency Domain 2 b Real Part a Impulse at x[0] c Imaginary ... account that the signal is aliased sin(BkM / N ) Mag X [ k] ' /0 /0 00 sin(Bk /N ) 00 Chapter 11- Fourier Transform Pairs Time Domain 213 Frequency Domain 20 a Rectangular pulse b Magnitude Phase (radians) ... i.e., a sinc function For continuous signals, the rectangular pulse and the sinc function are Fourier transform pairs For discrete signals this is only an approximation, with the error being due...
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The Fast Fourier Transform
Ngày tải lên :
13/09/2012, 09:50
... customary X(0) through K=K/2 X(N-1) GO TO 40 J=J+K RETURN END Chapter 12- The Fast Fourier Transform 1000 'THE FAST FOURIER TRANSFORM 1010 'Upon entry, N% contains the number of points in the DFT, REX[ ... interlace decomposition, separating the even and odd numbered samples Chapter 12- The Fast Fourier Transform Sample numbers in normal order Sample numbers after bit reversal Decimal Binary 229 ... dilution, the spectrum will additionally be multiplied by a sinusoid Chapter 12- The Fast Fourier Transform Odd- Four Point Frequency Spectrum xS xS xS + + + Even- Four Point Frequency Spectrum...
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The Complex Fourier Transform
Ngày tải lên :
13/09/2012, 10:20
... types of Fourier transforms: the Discrete Fourier Transform (discrete, periodic), the Discrete Time Fourier Transform (discrete, aperiodic), the Fourier Series (continuous, periodic), and the Fourier ... the complex Fourier transform, they are introduced by the real Fourier transform In the world of mathematics, the complex Fourier transform is a greater truth than the real Fourier transform This ... over one-half period, from to B TABLE 31-1 The Fourier Transforms Chapter 31- The Complex Fourier Transform 579 Fourier Series complex transform real transform j 2Bk t /T j X [k] e %4 synthesis...
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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
... thúc kiện Fourier không phát 2.4.2 Phương pháp STFT: Để đạt biến đổi Fourier cục bộ, định nghĩa biến đổi Fourier cửa sổ Tín hiệu đầu vào nhân với hàm cửa sổ W (t - τ) sau lấy biến đổi Fourier Kết ... 1,2 … −∞ 2.4.1.3 Chuỗi Fourier: Cho hàm tuần hoàn F(t) với chu kỳ T: F(t+T) = F(t) Nó biểu diễn tổ hợp tuyến tính số mũ phức với tần số nω 0, ω0 = 2π/T Khai triển chuỗi Fourier F(t) f (t ) = ∞ ... TỐT NGHIỆP 2.4.1.2 Tính chất: Dịch :Nếu miền thời gian f(t) bị dịch đoạn t0 miền tần số biến đổi Fourier nhân với hệ số pha: f (t − t ) ↔ e − jωt Ngược lại, miền tần số nhân hệ số pha miền thời...
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Real-Time Digital Signal Processing - Chapter 7: Fast Fourier Transform and Its Applications
Ngày tải lên :
28/10/2013, 05:15
... 7.1 Twiddle factors for DFT, N case 306 FAST FOURIER TRANSFORM AND ITS APPLICATIONS The inverse discrete Fourier transform (IDFT) is used to transform the X(k) back into the original sequence ... Circular Convolution The Fourier transform, the Laplace transform, and the z -transform of the linear convolution of two time functions are simply the products of the transforms of the individual ... by m samples are a linear shift of X(k) by WN DISCRETE FOURIER TRANSFORM 311 DFT and z -transform Consider a sequence x(n) having the z -transform X(z) with an ROC that includes the unit circle...
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Tài liệu Table of Fourier Transform Pairs ppt
Ngày tải lên :
13/12/2013, 12:15
... t e -t a2 +w2 /( 2s ) s 2p e -s w2 / a + jw u (t )e -at u (t )te -at (a + jw ) Ø Trigonometric Fourier Series ¥ f (t ) = a + å (a n cos(w nt ) + bn sin(w nt ) ) n =1 where a0 = T T ò0 2T f (t ... )dt , a n = ò f (t ) cos(w nt )dt , and T0 2T bn = ò f (t ) sin(w nt )dt T Ø Complex Exponential Fourier Series f (t ) = ¥ å Fn e jwnt , where n = -¥ Signals & Systems - Reference Tables 1T Fn...
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Tài liệu Fast Fourier Transform part 1 doc
Ngày tải lên :
21/01/2014, 18:20
... This result shows that multiplying the Fourier transform of one function by the complex conjugate of the Fourier transform of the other gives the Fourier transform of their correlation The correlation ... of a simple transform pair g ∗ h ⇐⇒ G(f)H(f) “Convolution Theorem” (12.0.9) In other words, the Fourier transform of the convolution is just the product of the individual Fourier transforms The ... (12.0.1) it is evident at once that Fourier transformation is a linear operation The transform of the sum of two functions is equal to the sum of the transforms The transform of a constant times a...
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Tài liệu Fast Fourier Transform part 2 ppt
Ngày tải lên :
21/01/2014, 18:20
... (outside North America) hn h(t) = ∆ 502 Chapter 12 Fast Fourier Transform h(t) ∆ t T H( f ) f ( b) aliased Fourier transform H( f ) − 2∆ true Fourier transform 2∆ f (c) Figure 12.1.1 The continuous function ... Fast Fourier Transform (Englewood Cliffs, NJ: Prentice-Hall) Elliott, D.F., and Rao, K.R 1982, Fast Transforms: Algorithms, Analyses, Applications (New York: Academic Press) 12.2 Fast Fourier Transform ... sampled, then, when we come to estimate its Fourier transform from the discrete samples, we can assume (or rather we might as well assume) that its Fourier transform is equal to zero outside of the...
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Tài liệu Fast Fourier Transform part 3 docx
Ngày tải lên :
21/01/2014, 18:20
... (outside North America) real array of length N real real array of length N Fast Fourier Transform 12.2 Fast Fourier Transform (FFT) 509 Other FFT Algorithms Sample page from NUMERICAL RECIPES IN ... taking a slow Fourier transform, of order N instead of order N log2 N Our advice is to stay clear of such FFT implementations, with perhaps one class of exceptions, the Winograd Fourier transform ... in these transforms, and the fact that the Winograd transform cannot be done “in place.” Finally, an interesting class of transforms for doing convolutions quickly are number theoretic transforms...
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Tài liệu Fast Fourier Transform part 4 pdf
Ngày tải lên :
21/01/2014, 18:20
... Real Functions, Sine and Cosine Transforms +1 (a) 3 +1 −1 +1 (c) −1 2π Figure 12.3.1 Basis functions used by the Fourier transform (a), sine transform (b), and cosine transform (c), are plotted The ... Calculates the Fourier transform of a set of n real-valued data points Replaces this data (which is stored in array data[1 n]) by the positive frequency half of its complex Fourier transform The ... within the original array This is the inverse transform for the case isign=-1 Fast Sine and Cosine Transforms Among their other uses, the Fourier transforms of functions can be used to solve differential...
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Tài liệu Fast Fourier Transform part 5 pptx
Ngày tải lên :
21/01/2014, 18:20
... ifp1=ifp2; } nprev *= n; } 525 12.5 Fourier Transforms of Real Data in Two and Three Dimensions CITED REFERENCES AND FURTHER READING: Nussbaumer, H.J 1982, Fast Fourier Transform and Convolution Algorithms ... few! For each value of k1 , k2 , , kL−1 you FFT to transform the L index Then for each value of k1 , k2 , , kL−2 and nL you FFT to transform the L − index And so on It is best to rely on ... data[], unsigned long nn[], int ndim, int isign) Replaces data by its ndim-dimensional discrete Fourier transform, if isign is input as nn[1 ndim] is an integer array containing the lengths of each...
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Tài liệu Fast Fourier Transform part 6 pdf
Ngày tải lên :
21/01/2014, 18:20
... where to find the real and imaginary components of the transform at some particular frequency!) We will implement the multidimensional real Fourier transform for the three dimensional case L = 3, with ... requires a small amount of extra storage for the answer, i.e., the transform is not quite “in place.” (Although an in-place transform is in fact possible, we have found it virtually impossible ... 526 Chapter 12 Fast Fourier Transform Re(SPEC[i1][i2][i3]) = data[i1][i2][2*i3-1] Im(SPEC[i1][i2][i3]) = data[i1][i2][2*i3]...
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Tài liệu Fast Fourier Transform part 7 docx
Ngày tải lên :
21/01/2014, 18:20
... permutation pass jk >>= 1; while (jk == 1) { mm=n; 534 Chapter 12 Fast Fourier Transform } j=1; The second phase of the transform starts here Now, the remaining permutations are sufficiently local ... one simply computes the component-by-component product of two transforms in their nonstandard arrangement, and then does an inverse transform on the result Note that, if the lengths of the different ... (thus giving the transpose dimensions) before performing the inverse transform Note also that, just like fourn, performing a transform and then an inverse results in multiplying the original data...
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Báo cáo khoa học: Determination of thioxylo-oligosaccharide binding to family 11 xylanases using electrospray ionization Fourier transform ion cyclotron resonance mass spectrometry and X-ray crystallography pot
Ngày tải lên :
07/03/2014, 17:20
... Jackson GS (1998) Fourier transform ion cyclotron resonance mass spectrometry: a primer Mass Spectrom Rev 17, 135 56 Smith RD (2000) Evolution of ESI-mass spectrometry and Fourier transform ion cyclotron ... is the use of ESIMS in the studies of noncovalent interactions [5254], as valuable parameters such as stoichiometry and binding constants can be determined A Fourier transform ion cyclotron resonance ... points, and 64 coadded time-domain transients were recorded The transients were subjected to fast Fourier transform, magnitude calculation, and one zero-ll Mass spectra were externally calibrated using...
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