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  1. Conference proceedings ; Online: Lower thermopsheric winds from ICON/MIGHTI and their impact on the ionosphere

    Yamazaki, Y.

    XXVIII General Assembly of the International Union of Geodesy and Geophysics (IUGG)

    2023  

    Abstract: Neutral winds in the lower thermosphere are believed to play an important role for the dynamics and electrodynamics of the ionosphere. However, global observations of the lower thermospheric winds have been limited after the Upper Atmosphere Research ... ...

    Abstract Neutral winds in the lower thermosphere are believed to play an important role for the dynamics and electrodynamics of the ionosphere. However, global observations of the lower thermospheric winds have been limited after the Upper Atmosphere Research Satellite mission, which made wind measurements mainly during the 1990s. The Ionospheric Connection Explorer (ICON) mission was launched on October 11, 2019. Since then, the Michelson Interferometer for Global High-resolution Thermospheric Imaging (MIGHTI) instrument onboard ICON has made continuous measurements of neutral wind velocity covering the lower and middle thermosphere between 90 and 300 km. The lower thermospheric winds from ICON/MIGHTI can be directly compared with ionospheric measurements from other satellite missions. This study presents two such examples. One is the conjunction observations of the lower thermospheric winds by ICON/MIGHTI and the equatorial electrojet derived from magnetic field measurements by the Swarm satellite mission. The other is the conjunction observations of the ICON/MIGHTI winds with sporadic-E layers derived from radio occultation measurements by the COSMIC-2 satellite constellation. In both cases, the wind effect on the ionospheric parameter was clearly observed. The physical mechanisms behind these observations will be discussed.
    Subject code 551
    Language English
    Publishing date 2023-07-11
    Publishing country de
    Document type Conference proceedings ; Online
    Database BASE - Bielefeld Academic Search Engine (life sciences selection)

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  2. Conference proceedings ; Online: A study of ionospheric dynamo currents using Swarm geomagnetic field measurements

    Yamazaki, Y.

    XXVIII General Assembly of the International Union of Geodesy and Geophysics (IUGG)

    2023  

    Abstract: It is well known that ionospheric currents in the dynamo region (ca 90-150 km) are responsible for the daily variation of the geomagnetic field on the ground. The global-scale current system that dominates geomagnetic daily variations at middle and low ... ...

    Abstract It is well known that ionospheric currents in the dynamo region (ca 90-150 km) are responsible for the daily variation of the geomagnetic field on the ground. The global-scale current system that dominates geomagnetic daily variations at middle and low latitudes is referred to as solar quiet (Sq). Geomagnetic signatures of Sq can be measured not only by ground-based magnetometers but also by magnetometers onboard low-Earth-orbit satellites. This presentation describes a recent effort to characterize Sq using high-precision magnetometer data from the Swarm mission. Internal and external equivalent Sq current systems are estimated based on the spherical harmonic analysis of Swarm geomagnetic field data. The internal Sq current system can be regarded as a superposition of ionospheric dynamo currents and induced underground currents. The external Sq current system at a satellite altitude (~500 km) is derived for the first time. The results suggest that the external Sq current system is due to interhemispheric field-aligned currents at low and middle latitudes.
    Subject code 550
    Language English
    Publishing date 2023-07-11
    Publishing country de
    Document type Conference proceedings ; Online
    Database BASE - Bielefeld Academic Search Engine (life sciences selection)

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  3. Article: Relationship between Body Mass Index and Sarcopenia with Oral Function Decline in Older Japanese Patients Who Regularly Attend a General Dental Clinic.

    Matsushita, Y / Watanabe, Y / Shirahase, R / Yamazaki, Y

    The Journal of frailty & aging

    2024  Volume 13, Issue 1, Page(s) 21–30

    Abstract: Background and objective: This study examined the relationship between body mass index (BMI) and sarcopenia with oral function decline in older patients as well as whether a combination of underweight BMI and sarcopenia was associated with decreased ... ...

    Abstract Background and objective: This study examined the relationship between body mass index (BMI) and sarcopenia with oral function decline in older patients as well as whether a combination of underweight BMI and sarcopenia was associated with decreased oral function in individuals with conservative restorative and prosthetic treatment for masticatory disorders.
    Design, setting, and participants: This cross-sectional study included 290 older Japanese patients who regularly attended a general dental clinic. A detailed examination of oral function, sarcopenia, and BMI according to the Asian Working Group for Sarcopenia 2019 criteria was conducted for patients aged 65 years. This study used odds ratios as an epidemiological measure in the cross-sectional survey.
    Results: Multinomial logistic regression analysis showed that the number of remaining teeth and tongue pressure was associated with both ideal and overweight BMI in individuals with sarcopenia when compared to healthy individuals. The underweight BMI plus sarcopenia group was associated with tongue and lip motor function [ka] sound test, swallowing function, and the presence of oral hypofunction.
    Discussion: Our findings indicated that various aspects of oral function were impaired in community-dwelling older adult Japanese patients with sarcopenia and underweight BMI. Notably, among older adults with sarcopenia, both obese and thin patients exist, suggesting that distinct pathophysiological mechanisms influence oral function.
    Conclusion: The above findings support the hypothesis that the coexistence of sarcopenia and underweight BMI is associated with poor oral function. Regular oral function assessments and weight measurements in general dental practice can aid the prompt identification of sarcopenia and reduced swallowing function and can facilitate early intervention. The presence of sarcopenia and impaired swallowing function should be considered in patients with underweight BMI, reduced [ka] sound, and low tongue pressure following a thorough oral function examination.
    MeSH term(s) Humans ; Aged ; Sarcopenia/diagnosis ; Sarcopenia/epidemiology ; Body Mass Index ; Cross-Sectional Studies ; Tongue ; Japan/epidemiology ; Thinness/epidemiology ; Pressure ; Dental Clinics
    Language English
    Publishing date 2024-02-02
    Publishing country France
    Document type Journal Article
    ZDB-ID 2856228-8
    ISSN 2273-4309 ; 2260-1341
    ISSN (online) 2273-4309
    ISSN 2260-1341
    DOI 10.14283/jfa.2024.5
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  4. Article ; Online: Evaluate Extubation in Neurosurgical Patients: Comment.

    Yamazaki, Yukiko / Hosokawa, Koji

    Anesthesiology

    2024  

    Language English
    Publishing date 2024-04-04
    Publishing country United States
    Document type Journal Article
    ZDB-ID 269-0
    ISSN 1528-1175 ; 0003-3022
    ISSN (online) 1528-1175
    ISSN 0003-3022
    DOI 10.1097/ALN.0000000000004940
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    Uk I Zs.133: Show issues Location:
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    bis Jg. 2021: Bestellungen von Artikeln über das Online-Bestellformular
    ab Jg. 2022: Lesesaal (EG)
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  5. Article ; Online: Evaluation of attenuation correction method for head holder in brain perfusion single-photon emission computed tomography.

    Nakashima, Masahiro / Yamazaki, Yuta

    Radiological physics and technology

    2024  Volume 17, Issue 1, Page(s) 322–328

    Abstract: Head holder attenuation affects brain perfusion single-photon emission computed tomography (SPECT) image quality. Here, we proposed a head holder-attenuation correction (AC) method using attenuation coefficient maps calculated by Chang's method from CT ... ...

    Abstract Head holder attenuation affects brain perfusion single-photon emission computed tomography (SPECT) image quality. Here, we proposed a head holder-attenuation correction (AC) method using attenuation coefficient maps calculated by Chang's method from CT images. Then, we evaluated the effectiveness of the head holder-AC method by numerical phantom and clinical cerebral perfusion SPECT studies. In the numerical phantom, the posterior counts were 10.7% lower than the anterior counts without head holder-AC method. However, by performing head holder-AC, the posterior count recovered by approximately 6.8%, approaching the true value. In the clinical study, the normalized count ratio was significantly increased by performing the head holder-AC method in the posterior-middle cerebral artery, posterior cerebral artery and cerebellum regions. There were no significant increases in other regions. The head holder-AC method can correct the counts attenuated by the head holder.
    MeSH term(s) Tomography, Emission-Computed, Single-Photon/methods ; Phantoms, Imaging ; Perfusion ; Brain/diagnostic imaging ; Image Processing, Computer-Assisted
    Language English
    Publishing date 2024-02-09
    Publishing country Japan
    Document type Journal Article
    ZDB-ID 2433581-2
    ISSN 1865-0341 ; 1865-0333
    ISSN (online) 1865-0341
    ISSN 1865-0333
    DOI 10.1007/s12194-024-00778-x
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  6. Article ; Online: Cold and stable antimatter for fundamental physics.

    Yamazaki, Yasunori

    Proceedings of the Japan Academy. Series B, Physical and biological sciences

    2020  Volume 96, Issue 10, Page(s) 471–501

    Abstract: The field of cold antimatter physics has rapidly developed in the last 20 years, overlapping with the period of the Antiproton Decelerator (AD) at CERN. The central subjects are CPT symmetry tests and Weak Equivalence Principle (WEP) tests. Various ... ...

    Abstract The field of cold antimatter physics has rapidly developed in the last 20 years, overlapping with the period of the Antiproton Decelerator (AD) at CERN. The central subjects are CPT symmetry tests and Weak Equivalence Principle (WEP) tests. Various groundbreaking techniques have been developed and are still in progress such as to cool antiprotons and positrons down to extremely low temperature, to manipulate antihydrogen atoms, to construct extremely high-precision Penning traps, etc. The precisions of the antiproton and proton magnetic moments have improved by six orders of magnitude, and also laser spectroscopy of antihydrogen has been realized and reached a relative precision of 2 × 10
    MeSH term(s) Cold Temperature ; Physics ; Protons ; Spectrum Analysis
    Chemical Substances Protons
    Language English
    Publishing date 2020-12-30
    Publishing country Japan
    Document type Journal Article
    ZDB-ID 161781-3
    ISSN 1349-2896 ; 0386-2208
    ISSN (online) 1349-2896
    ISSN 0386-2208
    DOI 10.2183/pjab.96.034
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    In stock of ZB MED Bonn / Germany

    Z 4' 46/60 b: Show issues
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  7. Article ; Online: Differences in Fine Structures between Normal and RNA-induced Drosophila Pole Cells: (Drosophila pole cell/fine structure/polar granule/nuclear body/cytoplasmic determinant).

    Yamazaki, Yoshihito / Okada, Masukichi

    Development, growth & differentiation

    2023  Volume 31, Issue 6, Page(s) 549–556

    Abstract: Fine structures were compared between normal pole cells and those induced in embryos that had been uv-irradiated and then injected with intact polar plasm or with poly(A) ...

    Abstract Fine structures were compared between normal pole cells and those induced in embryos that had been uv-irradiated and then injected with intact polar plasm or with poly(A)
    Language English
    Publishing date 2023-06-06
    Publishing country Japan
    Document type Journal Article
    ZDB-ID 280433-5
    ISSN 1440-169X ; 0012-1592
    ISSN (online) 1440-169X
    ISSN 0012-1592
    DOI 10.1111/j.1440-169X.1989.00549.x
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    In stock of ZB MED Cologne/Königswinter

    Zs.A 194: Show issues Location:
    Je nach Verfügbarkeit (siehe Angabe bei Bestand)
    bis Jg. 1994: Bestellungen von Artikeln über das Online-Bestellformular
    Jg. 1995 - 2021: Lesesall (1.OG)
    ab Jg. 2022: Lesesaal (EG)

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  8. Article ; Online: Photonic Physical Reservoir Computing with Tunable Relaxation Time Constant.

    Yamazaki, Yutaro / Kinoshita, Kentaro

    Advanced science (Weinheim, Baden-Wurttemberg, Germany)

    2023  Volume 11, Issue 3, Page(s) e2304804

    Abstract: Recent years have witnessed a rising demand for edge computing, and there is a need for methods to decrease the computational cost while maintaining a high learning performance when processing information at arbitrary edges. Reservoir computing using ... ...

    Abstract Recent years have witnessed a rising demand for edge computing, and there is a need for methods to decrease the computational cost while maintaining a high learning performance when processing information at arbitrary edges. Reservoir computing using physical dynamics has attracted significant attention. However, currently, the timescale of the input signals that can be processed by physical reservoirs is limited by the transient characteristics inherent to the selected physical system. This study used an Sn-doped In
    Language English
    Publishing date 2023-11-20
    Publishing country Germany
    Document type Journal Article
    ZDB-ID 2808093-2
    ISSN 2198-3844 ; 2198-3844
    ISSN (online) 2198-3844
    ISSN 2198-3844
    DOI 10.1002/advs.202304804
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  9. Article ; Online: Navigation Method Enhancing Music Listening Experience by Stimulating Both Neck Sides With Modulated Musical Vibration.

    Yamazaki, Yusuke / Hasegawa, Shoichi

    IEEE transactions on haptics

    2023  Volume 16, Issue 2, Page(s) 228–239

    Abstract: We propose a method that stimulates musical vibration (generated from and synchronized with musical signals), modulated by the direction and distance to the target, on both sides of a user's neck with Hapbeat, a necklace-type haptic device. We conducted ... ...

    Abstract We propose a method that stimulates musical vibration (generated from and synchronized with musical signals), modulated by the direction and distance to the target, on both sides of a user's neck with Hapbeat, a necklace-type haptic device. We conducted three experiments to confirm that the proposed method can achieve both haptic navigation and enhance the music-listening experience. Experiment 1 consisted of conducting a questionnaire survey to examine the effect of stimulating musical vibrations. Experiment 2 evaluated the accuracy (deg) of users' ability to adjust their direction toward a target using the proposed method. Experiment 3 examined the ability of four different navigation methods by performing navigation tasks in a virtual environment. The results of the experiments showed that stimulating musical vibration enhanced the music-listening experience, and that the proposed method is able to provide sufficient information to guide the users: accuracy in identifying directions was about 20
    MeSH term(s) Humans ; Music ; Vibration ; Touch Perception ; Auditory Perception
    Language English
    Publishing date 2023-06-20
    Publishing country United States
    Document type Journal Article ; Research Support, Non-U.S. Gov't
    ISSN 2329-4051
    ISSN (online) 2329-4051
    DOI 10.1109/TOH.2023.3266194
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  10. Article ; Online: "Don't Touch My Baby!": Negative Social Support Experiences During the COVID-19 Pandemic and Their Impacts on Maternal Mental Health.

    Kimura, Miyako / Yamazaki, Yoshihiko

    Asia-Pacific journal of public health

    2023  Volume 35, Issue 6-7, Page(s) 441–444

    MeSH term(s) Infant ; Humans ; Mental Health ; Pandemics ; COVID-19 ; Social Support
    Language English
    Publishing date 2023-07-08
    Publishing country China
    Document type Journal Article ; Research Support, Non-U.S. Gov't
    ZDB-ID 1025444-4
    ISSN 1941-2479 ; 1010-5395
    ISSN (online) 1941-2479
    ISSN 1010-5395
    DOI 10.1177/10105395231186008
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    In stock of ZB MED Cologne/Königswinter

    Zs.A 2802: Show issues Location:
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