vocs in gasoline contaminated groundwater using static headspace hs and solid phase microextraction headspace spme hs and gas chromatography
Trace Environmental Quantitative Analysis: Principles, Techniques, and Applications - Chapter 5 (end) ppt
... SCREENING FOR THE PRESENCE OF BTEX IN WASTEWATER USING LIQUID–LIQUID EXTRACTION (LLE) AND GAS CHROMATOGRAPHY; SCREENING FOR THMS IN CHLORINE-DISINFECTED DRINKING WATER USING STATIC HEADSPACE (HS) GAS ... opportunity in this experiment to quantitatively determine the concentration level of various BTEX compounds from gasoline- contaminated groundwater using static HS and SPME -HS techniques Both sampling/sample ... ICV, and report on the concentration of trifluralin in the soil in mg/kg (ppm) DETERMINATION OF PRIORITY POLLUTANT VOLATILE ORGANIC COMPOUNDS (VOCS) IN GASOLINECONTAMINATED GROUNDWATER USING STATIC...
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báo cáo hóa học:" Fourier-transform infrared anisotropy in cross and parallel sections of tendon and articular cartilage" pptx
... muscle and sheaths Unfixed fragments of 10 mm long and mm thick were cut, embedded in OCT compound (cryoembedding medium) and snap frozen using liquid nitrogen Special care was exercised in orienting ... no infrared anisotropy in (c) the axis of the alpha-helix [26], as shown in Figure 7a Since the amide bonds are fixed in the peptide chains and the fibril contains three identical chains in a ... tendon and cartilage from all different surfaces of the 3D tissue cube were investigated using infrared imaging To the best of our knowledge, there has been no study in literature regarding the infrared...
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Báo cáo khoa học: Light-induced reactions of Escherichia coli DNA photolyase monitored by Fourier transform infrared spectroscopy pot
... agar containing 150 mgÆL)1 ampicillin The plasmid was reisolated and electroporated into the expression strain M15[pREP4], which was then plated on LB agar containing 150 mgÆL)1 ampicillin and 15 ... results in a splitting of the former absorbance at 1396 cm)1 into two new lines at 1382 and 1405 cm)1 indicating the contribution of at least two modes (Fig 4B) We find distinct absorbance changes in ... harbouring plasmids p602E109A and pBL1 was cultured in baffled 2-L Erlenmeyer flasks containing 700 mL LB medium supplemented with 15 mg L)1 kanamycin and 10 mg L)1 erythromycin The cultures were incubated...
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Comparison between the Matrix Pencil Method and the Fourier Transform Technique for High-Resolution Spectral Estimation
... The window in the time domain is applied by weighting the input samples, zi , with the window coefficients, hi , by modifying Eq (5.1.2) in the following way: (5.2.4) 0, otherwise; Standard window ... consisted in modeling the inductive coupling and the radiated noise in switched mode power Supplies From 1994 to 1995 he was a visiting scholar in the Department of Electrical and Computer Engineering ... N In Figs 17 and 18 the windows are shown in both time and frequency domains The number of samples has been taken as 12 and the sampling period is 0.25 ms The main difference among these windows...
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báo cáo hóa học:" Analysis of ovarian tumor pathology by Fourier Transform Infrared Spectroscopy" pdf
... chain length and inter/intra chain bondings can be measured easily using infrared spectroscopy Recently, the application of infrared spectroscopy in biomedical sciences has increased a lot and ... tissue The increase in intensity is more clearly seen in second order derivative spectra of normal and malignant tissue in the region 2820-2980 cm -1 (Figure 6) This increase in intensity indicates ... with the findings of Anastassopoulou et al and Krafft et al, where increased intensity of nucleic acid bands were observed in cancerous tissue suggesting higher proliferative activity in malignant...
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Fourier transformed infrared absorption spectroscopy and kinetics studies of gas phase small molecules
... Chapter Introduction – CHAPTER – Introduction Chapter Introduction 1.1 Gas phase kinetics The study of elementary gas -phase reaction kinetics, a venerable area of chemical investigation, continues ... frequencies and band strengths of the species involved and the energies and geometries of reactive intermediates and transition states in these reactions will be determined However, the assumed dominant ... R Atkinson and J Arey, Chem Rev., 103, 4605, 2003 48 L Batt and R T Milne, Int J Chem Kinet., 6, 945, 1974 49 L Batt and R T Milne, Int J Chem Kinet., 8, 59, 1976 50 L Batt, Int J Chem Kinet.,...
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Accurate and efficient three dimensional electrostatics analysis using singular boundary elements and fast fourier transform on multipole (FFTM)
... separated into two components, with one containing the logarithm singularity, and the other is nonsingular The nonsingular part can be evaluated using the standard Gaussian quadrature, while the singular ... Conventor Inc., 4001 Weston Parkway, Cary, NC 27513 IntelliCAD IntelliSense Corp., Wilmington, MA 01887, USA SOLIDIS ISE Integrated Systems Engineering AG, Zurich Switzerland Chapter 1: Introduction ... h-, p- and r-refinement schemes, or their combinations (iii) Adaptive tactics process: This determines the elements to be refined by using the error estimator in (i), and the mesh refinement...
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Real-Time Digital Signal Processing - Chapter 7: Fast Fourier Transform and Its Applications
... decimation -in- time FFT algorithm using the floatingpoint C, fixed-point C, and assembly language We then implement the IFFT algorithm using the same FFT routine Finally, we apply both the FFT and IFFT ... floating-point C function, the fixed-point conversion is done by employing the C intrinsic functions The implementation of the decimation -in- time FFT butterfly computation using the C55x intrinsics ... The floating-point program will be used as reference for the code development using the fixed-point C and assembly language The floating-point program uses the floating-point data file input7_f.dat,...
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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
... Helsinki, Finland) CTX was initially puried using cation-exchange and hydrophobicinteraction chromatography and characterized by SDS PAGE and ESI FT-ICR analyses as described previously in detail ... protein form representing TRX II and glycosylated protein form representing CTX) In addition to equimolar complexes, : and : proteininhibitor complexes were typically present with higher initial inhibitor ... relatively low binding constants The nonspecic binding was also observed in the titration experiments; the relatively important two and three ligand binding indicated that the nonspecic binding constants...
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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
... 5.93 The training material comes from male and female speakers and consists of 6664 clean tokens, after removing unusable tokens identified during postprocessing The tokens from the remaining speakers ... that contains speech in one channel and noise in the other channel Each of the test sets contains 16 instances of each of the 24 consonants, giving a total of 2688 tokens in the combined test ... that the information on gross spectral peaks (formants) might be increasingly smeared when using high-resolution FrFT analysis On the other hand, the FrFT is a kind of linear transform and thus...
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Fast fourier transform on multipoles algorithm for elasticity and stokes flow
... successfully in many areas in science and engineering including heat transfer [32], fluid mechanics [68, 67], acoustics [14, 84], electromagnetics [63] and solid mechanics [1] The critical concept in the ... Elliott and Board’s method in that the convolution variables in the FFTM are the spatial coordinates of the source and field points instead of being the indices of translation operators as in Elliott ... showed its efficiency in solving micromagnetics problems [43, 41, 42] and in modeling multiple bubbles dynamics [7] Both the magnetostatic field and the inviscid, incompressible and irrotational fluid...
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The Discrete Fourier Transform
... cosine and sine waves enter the linear system, resulting in a mixture of cosine and sine waves leaving the system The problem is, a cosine wave on the input may result in both cosine and sine ... interesting properties For example, a single point in the frequency domain corresponds to a sinusoid in the time domain By duality, the inverse is also true, a single point in the time domain corresponds ... sin(2B k i / N ) N&1 i'0 In words, each sample in the frequency domain is found by multiplying the time domain signal by the sine or cosine wave being looked for, and adding the resulting points...
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Fourier Transform Properties
... by time domain shifting Figure 10-6 is an interesting demonstration of what information is contained in the phase, and what information is contained in the magnitude The waveform in (a) has two ... Fourier transform Adding two or more signals in one domain results in the corresponding signals being added in the other domain In this illustration, the time domain signals in (a) and (b) are added ... 10-6 Information contained in the phase Figure (a) shows a pulse-like waveform The signal in (b) is created by taking the DFT of (a), replacing the phase with random numbers, and taking the Inverse...
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Fourier Transform Pairs
... function pairs in rectangular form Each sample in the time domain results in a cosine wave in the real part, and a negative sine wave in the imaginary part of the frequency domain (f) show that ... sinusoids) Each sample in the time domain results in a cosine wave being added to the real part of the 212 The Scientist and Engineer's Guide to Digital Signal Processing frequency domain, and ... the time domain point The algorithm involves: (1) stepping through each time domain sample, (2) calculating the sine and cosine waves that correspond to each sample, and (3) adding up all of...
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The Fast Fourier Transform
... point time domain signal into N signals each containing a single point, (2) find the spectrum of each of the N point signals (nothing required), and (3) synthesize the N frequency spectra into ... time domain procedure of combining two point signals by interlacing Consider two time domain signals, abcd and efgh An point time domain signal can be formed by two steps: dilute each point signal ... domain, and then set all of the samples in the imaginary part to zero Calculation of the complex DFT results in a real and an imaginary signal in the frequency domain, each composed of N points...
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The Complex Fourier Transform
... how an individual value in the time domain is calculated from all the points in the frequency domain This is done by multiplying the frequency domain by a sinusoid, and integrating (continuous ... by adding all these real and imaginary sinusoids The important concept is that each value in the frequency domain produces both a real sinusoid and an imaginary sinusoid in the time domain For ... i.e., multiplying the time domain signal by a sinusoid and integrating (continuous time domain) or summing (discrete time domain) over the appropriate time domain section If the time domain signal...
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Các phương pháp xử lý tín hiệu dùng bộ lọc, phương pháp Fourier Transform, STFT( Short Time Fourier Transform)
... cách khác, tín hiệu chi tiết hiệu phiên thô phiên tinh tín hiệu Bằng cách áp dụng cách đệ quy dãy xấp xỉ, thấy không gian tín hiệu đầu vào L2(R) sinh không gian dãy xấp xỉ tất độ phân giải Khi độ ... Ψm,n(ω) tập trung quanh ω0 m Điều sinh trình lấy mẫu đôi miền thời gian - tần số f S m cale m= m= m= S n hift m = -2 t m = -2 Lấy mẫu đôi miền thời gian Tiling miền thời gian tần số tần số khai ... bảo toàn lượng: f (t ) = 2π ∞ ∞ ∫ ∫ STFT (ω ,τ ) f dωdτ (2.24) − ∞− ∞ Cung cấp phân bố lượng t 1in hiệu mặt phẳng thời gian tần số PS = SPEC x(γ ) (t , f ) = STFTx(γ ) (t , f ) 2 = ∫ x(t ) ⋅ γ...
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Graduate School - Verbal And Quantitative Practice, Gre
... relations and functions, equations and inequalities, and coordinate geometry (including slope, intercepts, and graphs of equations and inequalities) The skills required include the ability to solve linear ... triangles ● Points A, D, and C lie on a straight line, so ABC is also a triangle ● Point D is a distinct point between points A and C ● Point E is the only intersection point of line segment BC and the ... sum and product of even and odd integers will be even or odd depending on the operation and the kinds of integers; for example, the sum of an odd integer and an even integer is odd If an integer...
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Tài liệu Table of Fourier Transform Pairs ppt
... = e jx - e - jx sin( x) = 2j cos( x ± y ) = cos( x) cos( y ) m sin( x) sin( y ) sin( x ± y ) = sin( x) cos( y ) ± cos( x) sin( y ) cos(2 x) = cos ( x) - sin ( x) sin( x) = sin( x) cos( x) cos2 ... Useful Integrals ò cos( x)dx sin(x) ò sin( x)dx - cos(x) ò x cos( x)dx cos( x) + x sin( x) ò x sin( x)dx sin( x) - x cos( x) òx cos( x)dx x cos( x) + ( x - 2) sin( x) òx sin( x)dx x sin( x) - ... cos(2 x) sin ( x) = - cos(2 x) cos ( x) + sin ( x) = cos( x) cos( y ) = cos( x - y ) + cos( x + y ) sin( x) sin( y ) = cos( x - y ) - cos( x + y ) sin( x) cos( y ) = sin( x - y ) + sin( x + y...
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