electrospray ionization and fourier transform ion cyclotron resonance mass spectrometry ft icr ms

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

... (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 resonance ... (2002) Calcium and peptide binding to folded and unfolded conformations of cardiac troponin C Electrospray ionization and Fourier transform ion cyclotron resonance mass spectrometry Eur J Mass Spectrom ... TRX II and CTX using high-eld ESI FT- ICR MS and X-ray crystallography Results and Discussion ESI FT- ICR analyses Figure presents typical 9.4 T ESI FT- ICR mass spectra of TRX I, TRX II and CTX...

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Báo cáo sinh học: "High-resolution quantitative imaging of mammalian and bacterial cells using stable isotope mass spectrometry" docx

Ngày tải lên : 06/08/2014, 18:21

... what is the ionization yield (the fraction of atoms that are ionized)? How will the composition of the matrix affect the number of atoms sputtered, the ionization yield, and the formation of polyatomic ... secondary ions at high mass resolution, parallel detection of several secondary ions, high lateral resolution, and high precision of measurements A new generation of secondary -ion mass spectrometer ... sputtering, ionization and other effects that affect the emission of a single ion The relationship between contrast formation, lateral resolution and counting statistics The lateral resolution is...

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Novel lipidomic approaches to analyse glycerophospholipids and sphingolipids in complex mixtures using mass spectrometry

Ngày tải lên : 14/09/2015, 14:06

... 39 2.2.5 Lipid extraction 40 2.2.6 Lipid analysis by electrospray ionisation mass spectrometry (ESI -MS) and tandem mass spectrometry (MS/ MS) 40 2.2.7 Data processing ... the development of soft ionisation methods, electrospray ionisation (ESI) and matrix-assisted laser, desorption/ionisation (MALDI) mass spectrometry, has led to the realisation of a new level of ... The ions can be tentatively assigned by their mass- to-charge (m/z) ratio Characterisation of ions can be achieved by collision-induced dissociation (CID) and tandem mass spectrometry (MS/ MS)...

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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

... bit-reversal loop 344 FAST FOURIER TRANSFORM AND ITS APPLICATIONS 7.5.3 Experiment 7C ± FFT and IFFT As discussed in Section 7.2.3, the inverse DFT defined by (7.2.11) is similar to the DFT defined in (7.1.6) ... introduce FFT algorithms for the case where N is a power of 2, the radix-2 FFT algorithm There are two classes of FFT algorithms: decimation-in-time and decimation-infrequency In the decimation-in-time ... for fft 322 7.3 FAST FOURIER TRANSFORM AND ITS APPLICATIONS Applications FFT has a wide variety of applications in DSP Spectral analysis often requires the numerical computation of the frequency...

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Comparison between the Matrix Pencil Method and the Fourier Transform Technique for High-Resolution Spectral Estimation

Ngày tải lên : 26/03/2014, 00:29

... Intercommission Working Group of International URSI on Time Domain Metrology Dr Sarkar is a member of Sigma Xi and International Union of Radio Science Commissions A and B JOSE ENRIQUE FERNANDEZ DEL ... polarization processing and numerical solutions of operator equations arising in electromagnetics and signal processing with application to radar system design He obtained one of the ‘‘best solution’’ ... each N, and SNR Å dB The FTE uses the Kaiser window for this simulation and it can be seen that for long data record the FTE reaches the CRB Figure 22 shows a comparative study of the rmse as...

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báo cáo hóa học: " Method optimization and validation for the simultaneous determination of arachidonic acid metabolites in exhaled breath condensate by liquid chromatography-electrospray ionization tandem mass spectrometry" doc

Ngày tải lên : 20/06/2014, 00:20

... being solvent A and solvent B described in Methods Mass spectrometry A Sciex API 3000 tandem MS system was used for MS- MS detection with an electrospray ion source in the negative ion mode (ESI-) ... (multiple reaction monitoring) mode was chosen to perform the MS- MS detection MRM mode allows a simultaneous registration of all MS- MS transitions at a scan time of 150 ms for each fragmentation At the ... in occupational medicine Methods With recent progress in liquid chromatography separations and mass spectrometry detection systems, improvement in sensitivity and simultaneous detection of multiple...

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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

... information regarding the fibril orientation and bond directions in cartilage [23,24] When the long axis of the fibrils is in the plane of the tissue section, the bond directions of amide I and amide ... topographical variations, special attention was paid to the cartilage's location and orientation on the joint surface by preserving the interface between the soft tissue and the bone The cartilage ... Absorption anisotropy of amide I (a) and amide II (b) of tendon in the regular, parallel and cross sections Absorption anisotropy of amide I (a) and amide II (b) of tendon in the regular, parallel and...

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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

... the Radon-Wigner transform, and the Fractional Fourier transform Fractional Fourier transform, as a new time-frequency analysis tool, is attracting more and more attention in signal processing literature ... Section 4, diﬀerent order adaptation methods are described and illustrated using FFT- and FrFTbased spectrograms of an artiﬁcially generated vowel In Section 5, a tonal vowel discrimination test ... test is designed, and the results are given and analyzed Section presents the ASR experimental results and discussion Conclusions and suggestions for future work are given in Section The AM-FM Model...

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Simultaneous determination of sildenafil, vardenafil and tadalafil as forbidden components in natural dietary supplements for male sexual potency by high performance liquid chromatography–electrospray ionization

Ngày tải lên : 02/09/2015, 13:06

... baseline shifted greatly when gradient mobile phase was employed and the resolution of sildenafil and vardenafil decreased And the ionization of all analytes was greatly suppressed, sildenafil and tadalafil ... stock solution were transferred into a 10-ml volumetric flask, mixed and diluted to volume to yield a mixed standard solution Then, 5, 2, 1, 0.5, and 0.1 ml of the mixed standard solution were transferred ... ion source of MS Electrospray was operated in positive ion mode to generate protonated ions and sodiated ions The voltage of capillary, extractor and RF lens was set at 3.2 kV, and 0.5 V, respectively...

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Fast fourier transform on multipoles algorithm for elasticity and stokes flow

Ngày tải lên : 11/09/2015, 16:06

... dimensional Laplace equation, Navier equation, Stokes equation and nonlinear Poisson-type equation The FFTM method uses multipole moments and local expansions, together with the fast Fourier transform ... precondition and adaptation to reduce both the computation and memory storage to O(N ) The precondition decreases the number of iterations of their iterative solver and the adaptation avoids operations ... expansion and the multipole moment respectively The calculation of the convolution can be accelerated by the FFT The free software FFTW (Fastest Fourier Transform in the West), provided by Frigo and...

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Accurate and efficient three dimensional electrostatics analysis using singular boundary elements and fast fourier transform on multipole (FFTM)

Ngày tải lên : 15/09/2015, 21:09

... fundamental solution .132 C.2 Singularity expressions for singular shape functions after regularization transformations 133 D Automatic Identification of Singular Elements in MEMS Device Simulations 139 ... 3.2 Error estimation by higher interpolation function Boundary integral equation error type ˆ ˆ Suppose φ* and q * , and φ and q denote the exact solutions and the numerical solutions, respectively ... calculations using multipole expansions can be expressed as discrete convolutions, which are computed rapidly using Fast Fourier Transform (FFT) algorithms [49] We refer to it as the Fast Fourier Transform...

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CYCLOTRON RESONANCE LINE WIDTH DUE TO INTERACTION OF ELECTRON AND LO PHONON IN RECTANGULAR QUANTUM WIRE

Ngày tải lên : 30/10/2015, 20:49

... (4) (5) where p⃗ and e are the momentum operator and charge of a conduction electron, respectively, N = 0, 1, 2, and n = 1, 2, 3, denote the Landau-level index and subband indices, respectively, ... the cyclotron resonance peak (first one) has the greatest value This mean CYCLOTRON RESONANCE LINE-WIDTHS 179 width meV a 10 Line Abs Power Arb Units that the cyclotron resonance transition is ... numerically calculation the absorption power P (ω) in Eq (11) for a specific GaAs/AlAs RQW From the graphs of P (ω), we identify the position of cyclotron resonance peaks and obtain CRLW as profiles...

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The Discrete Fourier Transform

Ngày tải lên : 13/09/2012, 09:49

... sine and cosine waves that can be added to form the time domain signal The DFT basis functions are generated from the equations: EQUATION 8-1 Equations for the DFT basis functions In these equations, ... shift In equation form, the two representations are related: EQUATION 8-5 The addition of a cosine and sine wave results in a cosine wave with a different amplitude and phase shift The information ... 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? ...

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Fourier Transform Properties

Ngày tải lên : 13/09/2012, 09:49

... Discrete Time Fourier Transform (DTFT) is the member of the Fourier transform family that operates on aperiodic, discrete signals The best way to understand the DTFT is how it relates to the DFT To start, ... the DTFT can be understood by starting with the synthesis and analysis equations for the DFT (Eqs 8-2, 8-3 and 8-4), and taking N to infinity: j x [n] cos (T n ) %4 EQUATION 10-1 The DTFT analysis ... of the Fourier transform family For the DFT, Parseval's relation is expressed: EQUATION 10-3 Parseval's relation In this equation, x[i] is a time domain signal with i running from to N-1, and X[k]...

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Fourier Transform Pairs

Ngày tải lên : 13/09/2012, 09:49

... the outer and inner loops are exchanged The Sinc Function Figure 11-4 illustrates a common transform pair: the rectangular pulse and the sinc function (pronounced “sink”) The sinc function is defined ... graph and the other one-half on the left This appears to the DFT as a single pulse because of the time domain periodicity The DFT of this signal is shown in (b) and (c), with the unwrapped version ... x , 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...

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The Fast Fourier Transform

Ngày tải lên : 13/09/2012, 09:50

... FFT is an algorithm for calculating the complex DFT, it is important to understand how to transfer real DFT data into and out of the complex DFT format Figure 12-1 compares how the real DFT and ... operations is proportional to N times N The time to complete the program is thus given by: EQUATION 12-1 DFT execution time The time required to calculate a DFT by correlation is proportional ... butterfly computations This means the execution time for the program is approximated by: EQUATION 12-2 FFT execution time The time required to calculate a DFT using the FFT is proportional to N multiplied...

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The Complex Fourier Transform

Ngày tải lên : 13/09/2012, 10:20

... option used to make the real transforms more consistent with the complex transforms) Lastly, the synthesis equations for the real DFT and the real Fourier Series have special scaling instructions ... calculation, the spectra of the two signals are separated by an even/odd decomposition The Family of Fourier Transforms Just as the DFT has a real and complex version, so the other members of the Fourier ... definitions For example, when sinusoids are represented by complex numbers, we allow addition and subtraction, but prohibit multiplication and division The second thing handled poorly by the real Fourier...

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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 ... , f ) = STFTx(γ ) (t , f ) 2 = ∫ x(t ) ⋅ γ (t − t ) ⋅ e ∗ − j 2 ft (2.25) dt t Phân tích rời rạc : STFT x(γ ) (nT , kF ) = ∫ x (t )γ * (t − nT )e − j 2πkFt dt (2.26) t x(t ) = ∑∑ STFTx(γ ) (nT ... lại L2(R) tích phân kép f (t ) = 2π ∞ ∞ ∫ ∫ STFT (ω ,τ )g (t )dωdτ ω ,τ f (2.23) − ∞− ∞ STFT có tính chất bảo toàn lượng: f (t ) = 2π ∞ ∞ ∫ ∫ STFT (ω ,τ ) f dωdτ (2.24) − ∞− ∞ Cung cấp phân bố...

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Time-Domain Analysis and z Transform

Ngày tải lên : 29/09/2013, 21:20

... discuss this subject again in Section 2.5, after we learn the theory and application of z transforms 2.2 2.2.1 z TRANSFORM THEORY Deﬁnition In many textbooks, the z transform of a sequence x(n) is ... poles of the z transform Y1 (z), Y2 (z), Y3 (z) and appear in the partial fraction expansion for these functions The inverse z transform of each term in the partial fraction expansion will exhibit ... to arrive at the same deﬁnition In Chapter 3, we will study the implication of this transformation in more detail and get a fundamental understanding of the relationship between the frequency...

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Tài liệu Table of Fourier Transform Pairs ppt

Ngày tải lên : 13/12/2013, 12:15

... , 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 = ò ... Systems - Reference Tables (a + jw ) w + (a + jw ) 2 w0 u (t )e -at sin(w t ) e w + (a + jw ) 2a -a 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 ... Signals & Systems - Reference Tables 1T Fn = ò f (t )e - jw nt dt T Some Useful Mathematical Relationships e jx + e - jx cos( x) = e jx - e - jx sin( x) = 2j cos( x ± y ) = cos( x) cos( y ) m sin(...

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