Hadamard Transform Microscope Fluorescence Image

Mei, Erwen; Chen, Guanquan; Zeng, Yanwei

doi:10.1006/mchj.1996.0047

Cited by 10 publications

(4 citation statements)

References 14 publications

(14 reference statements)

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“…The Hadamard transform (HT) technique has been applied in a variety of fields, including time-of-flight mass spectrometry (Brock et al, 1998;Fernández et al, 2002;Trapp et al, 2004;Fernández et al, 2001), Raman spectrometry (Treado et al, 1990;DeVerse et al, 2000;DeVerse et al, 1999), fluorescence imaging (Chen et al, 1995;Mei et al, 1996;Tang et al, 2002;Hassler et al, 2005) ion mobility spectrometry (Clowers et al, 2006;Szumlas et al, 2006), and NMR (Kubo et al, 1996;Feliz et al, 2006). In addition, the application of the cross correlation technique to chromatographic separation was first proposed by Izawa and coworkers.…”

Section: Hadamard Transform (Ht)mentioning

confidence: 99%

Applications of Hadamard Transform-Gas Chromatography/Mass Spectrometry (HT-GC/MS) to the Detection of Pesticides in Rice

Lin¹,

Lin²

2011

Pesticides in the Modern World - Trends in Pesticides Analysis

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Section: Hadamard Transform (Ht)mentioning

confidence: 99%

Applications of Hadamard Transform-Gas Chromatography/Mass Spectrometry (HT-GC/MS) to the Detection of Pesticides in Rice

Lin¹,

Lin²

2011

Pesticides in the Modern World - Trends in Pesticides Analysis

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“…The chromatogram was decoded by means of inverse Hadamard transformation, and as a result, the S / N ratios were substantially improved, compared with a conventional single injection method. In fact, the HT technique has been applied in many fields, including TOFMS 14–17, Raman spectrometry 18–20, fluorescence imaging 21–24, ion mobility spectrometry 25, 26 and even NMR 27, 28. This technique has also been successfully applied to CE separations, where the theoretical background and experimental results were presented to demonstrate the capabilities and analytical advantages of the HT technique 29–33.…”

Section: Introductionmentioning

confidence: 99%

Application of Hadamard transform to gas chromatography/nonresonant multiphoton ionization/time‐of‐flight mass spectrometry

Cheng

Chang

Uchimura

et al. 2010

J of Separation Science

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The technique of Hadamard transform was successfully coupled with GC/nonresonant multiphoton ionization/TOFMS, for the first time. 1,4-Dichlorobenzene and the fourth harmonic generation (266 nm) of a Nd:YAG laser were employed as a model sample and an ionization laser, respectively. A Hadamard-injector coupled with a capillary-based supersonic jet nozzle (capillary-injector) was also developed in this study. The Hadamard-injector was used to obtain the chromatogram, which was encoded by successive sample introduction based on Hadamard codes, and the capillary-injector was used for injection of GC-elutes into TOFMS. Compared with a conventional single injection method, the S/N ratios were substantially improved after inverse Hadamard transformation of the encoded chromatogram. Under optimized conditions, when Hadamard matrices of 103 and 255 were used, the S/N ratios of the signals for 1,4-dichlorobenzene (concentration level, 4 microg/1 mL ACN) were substantially improved to 4.1- and 6.6-fold, respectively, and those improvements are in good agreement with those obtained by theory (5.1- and 8.0-fold).

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“…Therefore, correlation chromatography has been applied to not only GC – but also to LC – and to CE. , The Hadamard transform (HT) technique is a technique that is analogous to the correlation method. The HT technique has been applied in many fields, including time-of-flight mass spectrometry, – Raman, , fluorescence imaging, – ion mobility spectrometry, , and NMR. , In our previous studies, – Hadamard transformation has been successfully applied to capillary electrophoretic separations where the signal-to-noise (S/N) ratios were substantially improved by sample injections according to the PRBS. Nonconventional sampling techniques including correlation and HT methods have been reviewed by Kaljurand and Smit …”

mentioning

confidence: 99%

“…12,13 The Hadamard transform (HT) technique is a technique that is analogous to the correlation method. The HT technique has been applied in many fields, including time-of-flight mass spectrometry, [14][15][16] Raman, 17,18 fluorescence imaging, [19][20][21] ion mobility spectrometry, 22,23 and NMR. 24,25 In our previous studies, [26][27][28][29] Hadamard transformation has been successfully applied to capillary electrophoretic separations where the signal- to-noise (S/N) ratios were substantially improved by sample injections according to the PRBS.…”

mentioning

confidence: 99%

Applications of Hadamard Transform to Gas Chromatography/Mass Spectrometry and Liquid Chromatography/Mass Spectrometry

et al. 2008

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Successful application of the Hadamard transform (HT) technique to gas chromatography/mass spectrometry (GC/MS) and liquid chromatography/mass spectrometry (LC/MS) is described. Novel sample injection devices were developed to achieve multiple sample injections in both GC and LC instruments. Air pressure was controlled by an electromagnetic valve in GC, while a syringe pump and Tee connector were employed for the injection device in LC. Two well-known, abused drugs, 3,4-methylenedioxy-N-methylamphetamine (MDMA) and N, N-dimethyltryptamine (DMT), were employed as model samples. Both of the injection devices permitted precise successive injections, resulting in clearly modulated chromatograms encoded by Hadamard matrices. After inverse Hadamard transformation of the encoded chromatogram, the signal-to-noise (S/N) ratios of the signals were substantially improved compared with those expected from theoretical values. The S/N ratios were enhanced approximately 10-fold in HT-GC/MS and 6.8 in HT-LC/MS, using the matrices of 1023 and 511, respectively. The HT-GC/MS was successfully applied to the determination of MDMA in the urine sample of a suspect.

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Hadamard Transform Microscope Fluorescence Image

Cited by 10 publications

References 14 publications

Applications of Hadamard Transform-Gas Chromatography/Mass Spectrometry (HT-GC/MS) to the Detection of Pesticides in Rice

Applications of Hadamard Transform-Gas Chromatography/Mass Spectrometry (HT-GC/MS) to the Detection of Pesticides in Rice

Application of Hadamard transform to gas chromatography/nonresonant multiphoton ionization/time‐of‐flight mass spectrometry

Applications of Hadamard Transform to Gas Chromatography/Mass Spectrometry and Liquid Chromatography/Mass Spectrometry

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