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  1. Book ; Online: Footprints of Hopi History : Hopihiniwtiput Kukveni'at

    Kuwanwisiwma, Leigh J. / Ferguson, T. J. / Colwell, Chip

    2019  

    Keywords History of the Americas ; History ; Indigenous Peoples of the Americas
    Size 1 Online-Ressource
    Document type Book ; Online
    Note English ; Open Access
    HBZ-ID HT021051240
    Database ZB MED Catalogue: Medicine, Health, Nutrition, Environment, Agriculture

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  2. Article ; Online: Rapid Fluorescence EEM Spectroscopy Using Super-Cycle Hadamard-Transform Multiplexing.

    Ferguson, Travis / Loock, Hans-Peter

    Analytical chemistry

    2023  Volume 95, Issue 34, Page(s) 12691–12700

    Abstract: Hadamard-transform (HT) multiplexing has recently been applied to increasingly complex spectroscopic techniques. It had been shown that the data acquisition time for fluorescence excitation emission matrix (EEM) spectroscopy can be reduced by 1 or 2 ... ...

    Abstract Hadamard-transform (HT) multiplexing has recently been applied to increasingly complex spectroscopic techniques. It had been shown that the data acquisition time for fluorescence excitation emission matrix (EEM) spectroscopy can be reduced by 1 or 2 orders of magnitude using HT multiplexing of the excitation light using a programmable light source. In these previous studies, the data acquisition rate had been limited by the time it took to record an EEM, that is, to complete one cycle of multiplexed excitation spectra. The extraction of chemical information, such as concentration and chemical identity, is then obtained from parallel factor (PARAFAC) analysis of the sequence of EEMs. In this contribution, we increase the data acquisition rate by another order of magnitude, limited ultimately by the time it takes to record a single excitation spectrum. Our algorithm is entirely based on improved data processing, that is, it can be applied to previously recorded HT multiplexed data sets. The algorithm is based on three previously unexplored approaches: (1) we perform a PARAFAC multivariate analysis on the raw (multiplexed) data set, (2) the time-independent PARAFAC loading vectors are obtained prior to obtaining the time-dependent score vectors, and (3) when loading vectors are difficult to obtain from the EEMs, we instead use a rolling-average approach to considerably increase the stability of the fit. Analysis of experimental data shows that the scores of fluorescence EEMs with seven excitation wavelengths and over 1000 emission wavelengths can be obtained in less than 20 ms.
    Language English
    Publishing date 2023-08-15
    Publishing country United States
    Document type Journal Article
    ZDB-ID 1508-8
    ISSN 1520-6882 ; 0003-2700
    ISSN (online) 1520-6882
    ISSN 0003-2700
    DOI 10.1021/acs.analchem.3c01245
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  3. Article ; Online: Rapid Fluorescence EEM Spectroscopy Using Super-Cycle Hadamard-Transform Multiplexing

    Ferguson, Travis / Loock, Hans-Peter

    Analytical Chemistry. 2023 Aug. 15, v. 95, no. 34 p.12691-12700

    2023  

    Abstract: Hadamard-transform (HT) multiplexing has recently been applied to increasingly complex spectroscopic techniques. It had been shown that the data acquisition time for fluorescence excitation emission matrix (EEM) spectroscopy can be reduced by 1 or 2 ... ...

    Abstract Hadamard-transform (HT) multiplexing has recently been applied to increasingly complex spectroscopic techniques. It had been shown that the data acquisition time for fluorescence excitation emission matrix (EEM) spectroscopy can be reduced by 1 or 2 orders of magnitude using HT multiplexing of the excitation light using a programmable light source. In these previous studies, the data acquisition rate had been limited by the time it took to record an EEM, that is, to complete one cycle of multiplexed excitation spectra. The extraction of chemical information, such as concentration and chemical identity, is then obtained from parallel factor (PARAFAC) analysis of the sequence of EEMs. In this contribution, we increase the data acquisition rate by another order of magnitude, limited ultimately by the time it takes to record a single excitation spectrum. Our algorithm is entirely based on improved data processing, that is, it can be applied to previously recorded HT multiplexed data sets. The algorithm is based on three previously unexplored approaches: (1) we perform a PARAFAC multivariate analysis on the raw (multiplexed) data set, (2) the time-independent PARAFAC loading vectors are obtained prior to obtaining the time-dependent score vectors, and (3) when loading vectors are difficult to obtain from the EEMs, we instead use a rolling-average approach to considerably increase the stability of the fit. Analysis of experimental data shows that the scores of fluorescence EEMs with seven excitation wavelengths and over 1000 emission wavelengths can be obtained in less than 20 ms.
    Keywords algorithms ; analytical chemistry ; data collection ; fluorescence ; multivariate analysis ; spectroscopy
    Language English
    Dates of publication 2023-0815
    Size p. 12691-12700.
    Publishing place American Chemical Society
    Document type Article ; Online
    ZDB-ID 1508-8
    ISSN 1520-6882 ; 0003-2700
    ISSN (online) 1520-6882
    ISSN 0003-2700
    DOI 10.1021/acs.analchem.3c01245
    Database NAL-Catalogue (AGRICOLA)

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  4. Article: Class Address.

    Ferguson, T H

    The American journal of dental science

    2019  Volume 5, Issue 12, Page(s) 529–534

    Language English
    Publishing date 2019-02-12
    Publishing country United States
    Document type Journal Article
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  5. Book ; Online: Subcritical Bifurcations in the Kuramoto Model with Positive Coupling

    Ferguson, Timothy

    2020  

    Abstract: The Kuramoto model is a standard model for the dynamics of coupled oscillator networks. In particular, it is used to study long time behavior such as phase-locking where all oscillators rotate at a common frequency with fixed angle differences. It has ... ...

    Abstract The Kuramoto model is a standard model for the dynamics of coupled oscillator networks. In particular, it is used to study long time behavior such as phase-locking where all oscillators rotate at a common frequency with fixed angle differences. It has been observed that phase-locking occurs if the natural frequencies of the oscillators are sufficiently close to each other, and doesn't if they aren't. Intuitively, the closer the natural frequencies are to each other the more stable the system is. In this paper, we study the Kuramoto model on ring networks with positive coupling between the oscillators and derive a criterion for a bifurcation in which two branches of phase-locked solutions collide as we increase the coupling strengths. Furthermore, we state a criterion for when one of these branches consists of stable phase-locked solutions. In this case stability is lost as the positive coupling is increased. We then apply our criteria to show that for any size of the ring network there always exists choices of the natural frequencies and coupling strengths so that this bifurcation occurs. (We require at least five oscillators for one branch to consist of stable phase-locked solutions.) Finally, we conjecture that generically our bifurcation is locally a subcritical bifurcation and globally an $S$-curve. (In the case where one branch consists of phase-locked solutions, an $S$-curve results in bistability i.e. the existence of two distinct stable phase-locked solutions.) Finally, we note that our methods are constructive.

    Comment: 14 pages, 12 figures
    Keywords Mathematics - Dynamical Systems ; 34C15 ; 34C23 ; 34D20
    Subject code 612
    Publishing date 2020-01-29
    Publishing country us
    Document type Book ; Online
    Database BASE - Bielefeld Academic Search Engine (life sciences selection)

    Full text online

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  6. Article ; Online: Localized Heat Treatment for Meibomian Gland Dysfunction: A Single-Center Retrospective Analysis of Efficacy over Time.

    Chester, Thomas / Ferguson, Tanner / Chester, Emma

    Optometry and vision science : official publication of the American Academy of Optometry

    2023  Volume 100, Issue 9, Page(s) 625–630

    Abstract: Significance: Meibomian gland dysfunction (MGD) can produce a myriad of symptoms. The effective treatment of MGD can reduce the burden of this condition. Although several studies have indicated that TearCare (Sight Sciences, Menlo Park, CA) is an ... ...

    Abstract Significance: Meibomian gland dysfunction (MGD) can produce a myriad of symptoms. The effective treatment of MGD can reduce the burden of this condition. Although several studies have indicated that TearCare (Sight Sciences, Menlo Park, CA) is an effective treatment for MGD, no studies currently provide information regarding the duration of efficacy.
    Purpose: The purpose of this analysis was to determine the duration of efficacy of symptom relief and improvement of signs (as measured by gland function) for a treatment consisting of controlled heating of the meibomian glands using SmartLids (Sight Sciences) combined with manual expression of the liquefied meibum by a physician.
    Methods: This study involved retrospective analysis of data gathered from a single-center ophthalmology/optometry practice. Symptoms were assessed using the Standard Patient Evaluation of Eye Dryness (SPEED) questionnaire, and the signs were assessed using the meibomian gland expression (MGE) scores before and at several time points (8 weeks, 6 months, 12 months, and 18 months). Further analysis evaluating the efficacy in subgroups based on age, race, and sex was performed.
    Results: There were 78 patients included in this study. The mean baseline SPEED score decreased from 14 to 7.9 at 8 weeks. The mean SPEED scores at 6 and 12 months were maintained at 7.7 and 7.9, respectively, and at 18 months went to 8.9. At baseline, the mean MGE was 4.9 in the right eye and 4.8 in the left eye. In both eyes, the mean MGE increased to 9.0 in both eyes at 8 weeks. At 6 months, the mean MGE score was maintained at 8.6 in the right and 8.2 in the left and remained consistent at 12 months with 7.8 in the right and 7.8 in the left. At 18 months, the MGE score went to 6.8 in the right eye and 7.0 in the left eye.
    Conclusions: A single TearCare treatment effectively reduced both the symptoms and signs of MGD and maintained its effects for 12 months.
    MeSH term(s) Humans ; Meibomian Gland Dysfunction/diagnosis ; Retrospective Studies ; Hot Temperature ; Meibomian Glands ; Treatment Outcome ; Dry Eye Syndromes/diagnosis ; Tears/metabolism
    Language English
    Publishing date 2023-08-12
    Publishing country United States
    Document type Journal Article
    ZDB-ID 1001706-9
    ISSN 1538-9235 ; 1040-5488
    ISSN (online) 1538-9235
    ISSN 1040-5488
    DOI 10.1097/OPX.0000000000002053
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  7. Article ; Online: Invited Commentary.

    Ferguson, T Bruce

    The Annals of thoracic surgery

    2018  Volume 105, Issue 3, Page(s) 821–822

    MeSH term(s) Coronary Stenosis ; Humans ; Vascular Surgical Procedures
    Language English
    Publishing date 2018-02-17
    Publishing country Netherlands
    Document type Journal Article ; Comment
    ZDB-ID 211007-6
    ISSN 1552-6259 ; 0003-4975
    ISSN (online) 1552-6259
    ISSN 0003-4975
    DOI 10.1016/j.athoracsur.2017.09.048
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  8. Article: Lines of approach to public health.

    FERGUSON, T

    Public health

    2010  Volume 59, Page(s) 95–98

    MeSH term(s) Humans ; Public Health
    Language English
    Publishing date 2010-10-10
    Publishing country Netherlands
    Document type Journal Article
    ZDB-ID 427333-3
    ISSN 1476-5616 ; 0033-3506
    ISSN (online) 1476-5616
    ISSN 0033-3506
    DOI 10.1016/s0033-3506(45)80125-7
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  9. Book: Health online

    Ferguson, Tom

    how to find health information, support groups, and self-help communities in cyberspace

    1996  

    Author's details Tom Ferguson
    Keywords Information Services ; Information Storage and Retrieval ; Computer Communication Networks ; Medizin ; Datenverarbeitung ; Informationssystem
    Subject Computerunterstütztes Informationssystem ; Datenverarbeitung ; Fachinformationssystem ; Nachrichtensystem ; Dokumentationssystem ; Informationssysteme ; Humanmedizin ; Heilkunst ; Medicine ; ADV ; Automatische Datenverarbeitung ; Automatisierte Datenverarbeitung ; EDV ; Elektronische Datenverarbeitung
    Language English
    Size XXVII, 308 S.
    Edition 2. print.
    Publisher Addison-Wesley
    Publishing place Reading, Mass. u.a.
    Publishing country United States
    Document type Book
    HBZ-ID HT007225207
    ISBN 0-201-40989-5 ; 978-0-201-40989-5
    Database Catalogue ZB MED Medicine, Health

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    Shelf markLoan statusLocation
    1997 A 1920 order for loan Magazin

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  10. Article: Dean's Update.

    Ferguson, Trevor

    Primary dental journal

    2015  Volume 4, Issue 1, Page(s) 6

    MeSH term(s) Communication ; Humans ; Informed Consent ; Practice Management, Dental
    Language English
    Publishing date 2015-02-03
    Publishing country United States
    Document type Journal Article
    ZDB-ID 2685942-7
    ISSN 2050-1684
    ISSN 2050-1684
    DOI 10.1308/205016815814456662
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