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  1. Article ; Online: Characteristics of coexisting attractors and ghost orbiting in an optomechanical microresonator.

    Chapman, D M / Burton, E K T / Hall, J R / Rosenberger, A T / Bandy, D K

    Chaos (Woodbury, N.Y.)

    2024  Volume 34, Issue 4

    Abstract: We explore the nonlinear interactions of an optomechanical microresonator driven by two external optical signals. Optical whispering-gallery waves are coupled to acoustic surface waves of a fused silica medium in the equatorial plane of a generic ... ...

    Abstract We explore the nonlinear interactions of an optomechanical microresonator driven by two external optical signals. Optical whispering-gallery waves are coupled to acoustic surface waves of a fused silica medium in the equatorial plane of a generic microresonator. The system exhibits coexisting attractors whose behaviors include limit cycles, steady states, tori, quasi-chaos, and fully developed chaos with ghost orbits of a known attractor. Bifurcation diagrams demonstrate the existence of self-similarity, periodic windows, and coexisting attractors and show high-density lines within chaos that suggests a potential ghost orbit. In addition, the Lyapunov spectral components as a function of control parameter illuminate the dynamic nature of attractors and periodic windows with symmetric and asymmetric formations, their domains of existence, their bifurcations, and other nonlinear effects. We show that the power-shift method can access accurately and efficiently attractors in the optomechanical system as it does in other nonlinear systems. To test whether the ghost orbit is the link between two attractors interrupted by chaos, we examine the elements of the bifurcation diagrams as a function of control parameter. We also use detuning as a second control parameter to avoid the chaotic region and clarify that the two attractors are one.
    Language English
    Publishing date 2024-04-08
    Publishing country United States
    Document type Journal Article
    ZDB-ID 1472677-4
    ISSN 1089-7682 ; 1054-1500
    ISSN (online) 1089-7682
    ISSN 1054-1500
    DOI 10.1063/5.0201717
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  2. Article ; Online: Predicting attractor characteristics using Lyapunov exponents in a laser with injected signal.

    Bandy, D K / Burton, E K T / Hall, J R / Chapman, D M / Elrod, J T

    Chaos (Woodbury, N.Y.)

    2021  Volume 31, Issue 1, Page(s) 13120

    Abstract: Coexisting attractors are studied in a single-mode coherent model of a laser with an injected signal. We report that every attractor has a unique Lyapunov exponent (LE) pattern that is choreographed by the subtle variations in the attractor's dynamics ... ...

    Abstract Coexisting attractors are studied in a single-mode coherent model of a laser with an injected signal. We report that every attractor has a unique Lyapunov exponent (LE) pattern that is choreographed by the subtle variations in the attractor's dynamics and circumscribed by a common Lyapunov spectral pattern that begins and ends with two-zero LEs. Lyapunov spectra form symmetric-like and asymmetric bubbles; the former foreshadows an attractor's proximity to the cusp of an eminent change in dynamics and the latter indicates the presence of a bifurcation. We show that the peak values of the asymmetric bubbles are always associated with two-zero LEs; in fact, they are allied inseparably in forecasting period-doubling episodes. The two-zero LEs' predictor of torus dynamics is refined to include the convergence of three LEs to a triplet of zeros as a precursor to the two-zero spectra. We report that the long-standing two-zero LEs' signature is a necessary but not sufficient condition for predicting attractors and their dynamic conditions. The evolution of the attractor volume as a function of the injected signal is compared to the spectral formation of the attractor; we report slope changes and points of inflections in the volume trajectory where spectral changes indicate dynamic changes. Attractor viability is tested preliminarily by including random low-level noise in the frequency of the injected signal.
    Language English
    Publishing date 2021-03-22
    Publishing country United States
    Document type Journal Article
    ZDB-ID 1472677-4
    ISSN 1089-7682 ; 1054-1500
    ISSN (online) 1089-7682
    ISSN 1054-1500
    DOI 10.1063/5.0018586
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  3. Article ; Online: Isolated revision of the polyethylene component at revision total knee arthroplasty has excellent survivorship at ten years.

    Greenwell, P H / Shield, W P / Chapman, D M / Dalury, D F

    The bone & joint journal

    2019  Volume 101-B, Issue 7_Supple_C, Page(s) 104–107

    Abstract: Aims: The aim of this study was to establish the results of isolated exchange of the tibial polyethylene insert in revision total knee arthroplasty (RTKA) in patients with well-fixed femoral or tibial components. We report on a series of RTKAs where ... ...

    Abstract Aims: The aim of this study was to establish the results of isolated exchange of the tibial polyethylene insert in revision total knee arthroplasty (RTKA) in patients with well-fixed femoral or tibial components. We report on a series of RTKAs where only the polyethylene was replaced, and the patients were followed for a mean of 13.2 years (10.0 to 19.1).
    Patients and methods: Our study group consisted of 64 non-infected, grossly stable TKA patients revised over an eight-year period (1998 to 2006). The mean age of the patients at time of revision was 72.2 years (48 to 88). There were 36 females (56%) and 28 males (44%) in the cohort. All patients had received the same cemented, cruciate-retaining patella resurfaced primary TKA. All subsequently underwent an isolated polyethylene insert exchange. The mean time from the primary TKA to RTKA was 9.1 years (2.2 to 16.1).
    Results: At final follow-up, 13 patients had died, leaving 51 patients for study. Only seven of these patients had required re-operation. Knee Society scores (KSS) prior to RTKA were a mean of 78.4 (24 to 100). By six weeks post-revision, the mean total KSS was 93.5 (38 to 100) and at final follow-up, they had a mean of 91.6 (36 to 100).
    Conclusion: In appropriate circumstances, where the femoral and tibial components are satisfactorily aligned and well fixed, and where the soft tissues can be balanced, a polyethylene exchange alone can provide a durable solution for these RTKA patients. Cite this article:
    MeSH term(s) Aged ; Aged, 80 and over ; Arthroplasty, Replacement, Knee/methods ; Female ; Humans ; Knee Joint/diagnostic imaging ; Knee Joint/surgery ; Knee Prosthesis ; Male ; Middle Aged ; Polyethylene ; Prosthesis Failure ; Reoperation ; Retrospective Studies ; Tibia/surgery ; Time Factors ; Treatment Outcome
    Chemical Substances Polyethylene (9002-88-4)
    Language English
    Publishing date 2019-06-08
    Publishing country England
    Document type Journal Article
    ZDB-ID 2697156-2
    ISSN 2049-4408 ; 2049-4394
    ISSN (online) 2049-4408
    ISSN 2049-4394
    DOI 10.1302/0301-620X.101B7.BJJ-2018-1498.R2
    Database MEDical Literature Analysis and Retrieval System OnLINE

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    Zs.A 6989: Show issues Location:
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  4. Article: The nature of cnidarian desmocytes.

    Chapman, D M

    Tissue & cell

    2008  Volume 1, Issue 4, Page(s) 619–632

    Abstract: The electron microscope reveals that the cnidarian desmocyte is an ectodermal cell which forms acidophil protein tonofibrillae intracellularly. One end of the cell is bound to mesogleal fibrils; the other becomes embedded in the thickening cuticle. The ... ...

    Abstract The electron microscope reveals that the cnidarian desmocyte is an ectodermal cell which forms acidophil protein tonofibrillae intracellularly. One end of the cell is bound to mesogleal fibrils; the other becomes embedded in the thickening cuticle. The bundle of tonofibrillae later becomes rivet-shaped and the cell dies, but still the mesoglea remains bound to the cuticle by means of the rivet. The histochemistry and formation of the rivet as well as the comparative cytology of cnidarian desmocytes are discussed.
    Language English
    Publishing date 2008-07-08
    Publishing country Scotland
    Document type Journal Article
    ZDB-ID 204424-9
    ISSN 1532-3072 ; 0040-8166
    ISSN (online) 1532-3072
    ISSN 0040-8166
    DOI 10.1016/s0040-8166(69)80036-4
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  5. Article: CO-ORDINATION IN A SCYPHISTOMA.

    CHAPMAN, D M

    American zoologist

    2003  Volume 5, Page(s) 455–464

    MeSH term(s) Anatomy ; Animals ; Behavior, Animal ; Cnidaria
    Language English
    Publishing date 2003-10-03
    Publishing country United States
    Document type Journal Article
    ZDB-ID 201481-6
    ISSN 0003-1569 ; 1540-7063
    ISSN 0003-1569 ; 1540-7063
    DOI 10.1093/icb/5.3.455
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    Zs.B 672: Show issues Location:
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  6. Article: Decibels, SI units, and standards.

    Chapman, D M

    The Journal of the Acoustical Society of America

    2000  Volume 108, Issue 2, Page(s) 480

    MeSH term(s) Acoustics ; Auditory Perception/physiology ; Humans ; Physics/methods
    Language English
    Publishing date 2000-08-07
    Publishing country United States
    Document type Journal Article
    ZDB-ID 219231-7
    ISSN 1520-8524 ; 0001-4966
    ISSN (online) 1520-8524
    ISSN 0001-4966
    DOI 10.1121/1.429620
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  7. Article: Definitively defining the specialty of emergency medicine: issues of procedural competency.

    Chapman, D M

    Academic emergency medicine : official journal of the Society for Academic Emergency Medicine

    1999  Volume 6, Issue 7, Page(s) 678–681

    MeSH term(s) Clinical Competence/standards ; Credentialing/standards ; Emergency Medicine/education ; Emergency Medicine/standards ; Humans ; Internship and Residency/standards ; Specialty Boards/standards ; United States
    Language English
    Publishing date 1999-07
    Publishing country United States
    Document type Comment ; Editorial
    ZDB-ID 1329813-6
    ISSN 1553-2712 ; 1069-6563
    ISSN (online) 1553-2712
    ISSN 1069-6563
    DOI 10.1111/j.1553-2712.1999.tb00434.x
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    Zs.A 4479: Show issues Location:
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  8. Article: Burnout in emergency medicine: what are we doing to ourselves?

    Chapman, D M

    Academic emergency medicine : official journal of the Society for Academic Emergency Medicine

    1997  Volume 4, Issue 4, Page(s) 245–247

    MeSH term(s) Burnout, Professional ; Emergency Medicine ; Humans ; Internship and Residency ; Stress, Psychological ; Workload
    Language English
    Publishing date 1997-04
    Publishing country United States
    Document type Editorial
    ZDB-ID 1329813-6
    ISSN 1553-2712 ; 1069-6563
    ISSN (online) 1553-2712
    ISSN 1069-6563
    DOI 10.1111/j.1553-2712.1997.tb03543.x
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  9. Article: The nature of cuticular "ruffles" on slowly plucked anagen hair roots.

    Chapman, D M

    Journal of cutaneous pathology

    1997  Volume 24, Issue 7, Page(s) 434–439

    Abstract: When an anagen hair is slowly plucked, the root's surface near the distal end of the keratogenous zone shows rings of 'ruffles' which are cuticular scales rolled back towards the root tip in a tight curl. During extraction, the rachet-like cuticle of the ...

    Abstract When an anagen hair is slowly plucked, the root's surface near the distal end of the keratogenous zone shows rings of 'ruffles' which are cuticular scales rolled back towards the root tip in a tight curl. During extraction, the rachet-like cuticle of the inner root sheath tears apart the almost differentiated cuticular scales on the root's cortex. Further extraction rolls up the cuticle because of the friction with the inner root sheath cuticle and because the torn intercellular cement reconstitutes so that the ruffle's curl is stabilized by cohesion (self-gluing). No evidence was found for pretensioning in the root's cuticle as an explanation for the curling.
    MeSH term(s) Hair/ultrastructure ; Hair Follicle/injuries ; Hair Follicle/ultrastructure ; Hair Removal ; Humans ; Male ; Microscopy, Electron ; Microscopy, Electron, Scanning ; Middle Aged ; Scalp ; Thorax
    Language English
    Publishing date 1997-08
    Publishing country United States
    Document type Journal Article ; Research Support, Non-U.S. Gov't
    ZDB-ID 187078-6
    ISSN 1600-0560 ; 0303-6987
    ISSN (online) 1600-0560
    ISSN 0303-6987
    DOI 10.1111/j.1600-0560.1997.tb00819.x
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  10. Article: Use of computer-based technologies in teaching emergency procedural skills.

    Chapman, D M

    Academic emergency medicine : official journal of the Society for Academic Emergency Medicine

    1994  Volume 1, Issue 4, Page(s) 404–407

    MeSH term(s) Clinical Competence ; Computers ; Emergency Medicine/education ; Humans ; Learning ; Teaching/methods
    Language English
    Publishing date 1994-07
    Publishing country United States
    Document type Journal Article
    ZDB-ID 1329813-6
    ISSN 1553-2712 ; 1069-6563
    ISSN (online) 1553-2712
    ISSN 1069-6563
    DOI 10.1111/j.1553-2712.1994.tb02656.x
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