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  1. Article ; Online: Frequency-multiplexed on-demand storage in five modes of atomic frequency comb through simultaneous application of control pulses.

    Masuko, Taihei / Yoshida, Daisuke / Aida, Ayaka / Hong, Feng-Lei / Horikiri, Tomoyuki

    Applied optics

    2024  Volume 63, Issue 7, Page(s) 1875–1880

    Abstract: In quantum communication with quantum repeaters, multiplexed quantum memory is expected to enhance communication rates. When using an atomic frequency comb (AFC) for on-demand storage, the frequency mode number is often limited by the optical power of ... ...

    Abstract In quantum communication with quantum repeaters, multiplexed quantum memory is expected to enhance communication rates. When using an atomic frequency comb (AFC) for on-demand storage, the frequency mode number is often limited by the optical power of the control pulses. Here, using a space-coupled waveguide electro-optic modulator, we increased the output power, allowing us to apply control pulses to multiple modes simultaneously. Further, through enhancement of an experimental setup that increases power density, we increased the number of modes. Consequently, we pioneered, to the best of our knowledge, on-demand storage using five modes of AFC. This technology is a significant achievement toward frequency-multiplexed on-demand quantum memory.
    Language English
    Publishing date 2024-03-04
    Publishing country United States
    Document type Journal Article
    ISSN 1539-4522
    ISSN (online) 1539-4522
    DOI 10.1364/AO.514004
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  2. Article ; Online: Stability and bonding nature of positronic lithium molecular dianion.

    Ito, Shumpei / Yoshida, Daisuke / Kita, Yukiumi / Shimazaki, Tomomi / Tachikawa, Masanori

    The Journal of chemical physics

    2023  Volume 158, Issue 20

    Abstract: We studied the stability of a system consisting of a positron (e+) and two lithium anions, [Li-; e+; Li-], using first-principles quantum Monte Carlo calculations combined with the multi-component molecular orbital method. While diatomic lithium ... ...

    Abstract We studied the stability of a system consisting of a positron (e+) and two lithium anions, [Li-; e+; Li-], using first-principles quantum Monte Carlo calculations combined with the multi-component molecular orbital method. While diatomic lithium molecular dianions Li22- are unstable, we found that its positronic complex can form a bound state with respect to the lowest energy decay into the dissociation channel Li2- and a positronium (Ps). The [Li-; e+; Li-] system has the minimum energy at the internuclear distance of ∼3 Å, which is close to the equilibrium internuclear distance of Li2-. At the minimum energy structure both an excess electron and a positron are delocalized as orbiting around the Li2- molecular anion core. A dominant feature of such a positron bonding structure is described as the Ps fraction bound to Li2-, unlike the covalent positron bonding scheme for the electronically isovalent [H-; e+; H-] complex.
    Language English
    Publishing date 2023-05-26
    Publishing country United States
    Document type Journal Article
    ZDB-ID 3113-6
    ISSN 1089-7690 ; 0021-9606
    ISSN (online) 1089-7690
    ISSN 0021-9606
    DOI 10.1063/5.0150246
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  3. Article: [Recurrence of a Giant Emphysematous Bulla After Bullectomy:Report of a Case].

    Inoue, Yuta / Yoshida, Daisuke / Yotsumoto, Takuma / Shibasaki, Takamasa / Fukami, Takeshi

    Kyobu geka. The Japanese journal of thoracic surgery

    2023  Volume 76, Issue 12, Page(s) 1065–1068

    Abstract: A 38-year-old male, he was diagnosed with a giant pulmonary bulla occupying 2/3 of the right thoracic cavity on chest computed tomography( CT). The preoperative pulmonary function was unfavorable, so bullectomy of right upper lobe with video-assisted ... ...

    Abstract A 38-year-old male, he was diagnosed with a giant pulmonary bulla occupying 2/3 of the right thoracic cavity on chest computed tomography( CT). The preoperative pulmonary function was unfavorable, so bullectomy of right upper lobe with video-assisted thoracoscopic surgery( VATS) was performed. The outpatient follow-up was completed at 6 months after surgery. However, one year and eleven months postoperatively, the patient returned to the clinic complaining of dyspnea. Chest X-ray and CT showed a recurrence of a giant emphysematous bulla in the right upper lobe. Two years and three months after the initial surgery, the recurrent giant bulla was resected by right upper lobectomy with VATS. About four years after the reoperation, no recurrence of giant pulmonary bulla has been seen. Although there are some reports on surgical treatment and results of giant pulmonary bulla, there are few reports on recurrent cases, so we report this case.
    MeSH term(s) Male ; Humans ; Adult ; Blister/diagnostic imaging ; Blister/surgery ; Pulmonary Emphysema/diagnostic imaging ; Pulmonary Emphysema/surgery ; Lung/surgery ; Lung Diseases
    Language Japanese
    Publishing date 2023-12-06
    Publishing country Japan
    Document type Case Reports ; English Abstract ; Journal Article
    ZDB-ID 603899-2
    ISSN 0021-5252
    ISSN 0021-5252
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  4. Article ; Online: A comprehensive theoretical study of positron binding and annihilation properties of hydrogen bonded binary molecular clusters.

    Yoshida, Daisuke / Kita, Yukiumi / Shimazaki, Tomomi / Tachikawa, Masanori

    Physical chemistry chemical physics : PCCP

    2022  Volume 24, Issue 43, Page(s) 26898–26907

    Abstract: We studied the positron binding and annihilation of hydrogen bonded binary molecular clusters containing small inorganic molecules such as water, hydrogen fluoride, ammonia, hydrogen sulfide, hydrogen chloride, and phosphine, using first-principles ... ...

    Abstract We studied the positron binding and annihilation of hydrogen bonded binary molecular clusters containing small inorganic molecules such as water, hydrogen fluoride, ammonia, hydrogen sulfide, hydrogen chloride, and phosphine, using first-principles calculation. While unimolecular systems of these species mostly exhibit no or very small positron binding energies (positron affinities), we found that all of their hydrogen bonding clusters have greater positive positron affinities. The permanent dipole moment enhanced by the formation of the intermolecular hydrogen bond acts as a dominant parameter to bind a positron for a given proton donor, whereas it is insufficient for reproducing the dependence of the positron affinity on substitutions of the proton donor. By multiple regression analyses with inherent properties of the clusters, we found a reasonable model with additional effective parameters represented by, particularly, the number of hydrogen atoms free from the hydrogen bond. By density analyses for the single-particle and electron-positron collision probabilities, we revealed that these effective parameters are associated with the electronic structure changes induced by the hydrogen bond and positron binding, which have important roles to enhance the electron-positron contact densities due to the proton-screening effect.
    Language English
    Publishing date 2022-11-09
    Publishing country England
    Document type Journal Article
    ZDB-ID 1476244-4
    ISSN 1463-9084 ; 1463-9076
    ISSN (online) 1463-9084
    ISSN 1463-9076
    DOI 10.1039/d2cp03813g
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  5. Article ; Online: Odd-Even Reactivity Variation Due to Dynamical Effects around the Roaming Saddle Points of the Reaction Between C

    Yoshida, Daisuke / Takahashi, Kaito

    The journal of physical chemistry. A

    2019  Volume 123, Issue 25, Page(s) 5300–5308

    Abstract: Unsaturated carbon cluster chains often have chemical properties depending on the cluster size. While carbon cluster cation chains show odd-even variation in the reactivity with hydrogen, the chemistry of the carbon anion chain has been poorly understood ...

    Abstract Unsaturated carbon cluster chains often have chemical properties depending on the cluster size. While carbon cluster cation chains show odd-even variation in the reactivity with hydrogen, the chemistry of the carbon anion chain has been poorly understood even for the bimolecular reaction with hydrogen. We present a systematic theoretical study based on transition state calculations and molecular dynamics trajectory simulations for the reaction of C
    Language English
    Publishing date 2019-06-17
    Publishing country United States
    Document type Journal Article
    ISSN 1520-5215
    ISSN (online) 1520-5215
    DOI 10.1021/acs.jpca.9b03435
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  6. Article ; Online: Incidence and characteristics of aspiration pneumonia in the Nagasaki Prefecture from 2005 to 2019.

    Tomonaga, Iku / Koseki, Hironobu / Imai, Chieko / Shida, Takayuki / Nishiyama, Yuta / Yoshida, Daisuke / Yokoo, Seiichi / Osaki, Makoto

    BMC pulmonary medicine

    2024  Volume 24, Issue 1, Page(s) 191

    Abstract: Background: Aspiration pneumoniae remains a major health concern, particularly in the older population and has poor prognosis; however, the concept itself remains vague worldwide. This study aimed to determine the actual situation and characteristics of ...

    Abstract Background: Aspiration pneumoniae remains a major health concern, particularly in the older population and has poor prognosis; however, the concept itself remains vague worldwide. This study aimed to determine the actual situation and characteristics of aspiration pneumonia from 2005 to 2019 in Nagasaki Prefecture, Japan.
    Methods: Cases of aspiration pneumonia that occurred in the Nagasaki Prefecture between 2005 and 2019 were analyzed using emergency transportation records. The number of occurrences and incidence were analyzed according to age, sex, month, day of the week, and recognition time to clarify the actual situation of aspiration pneumonia.
    Results: The total number of new aspiration pneumonia cases was 8,321, and the mean age of the patients was 83.0 years. Annual incidence per 100,000 population increased from 12.4 in 2005 to 65.1 in 2019, with the most prominent increase in the ≥ 80-year-old stratum. Males (55.1%) were more commonly affected than females (44.9%), and 82.2% of the cases involved patients aged ≥ 70 years. No significant correlations were observed between the incidence of aspiration pneumonia and season, month, or day of the week. Aspiration pneumonia occurred frequently in houses (39.8%) and facilities for elderly individuals (40.8%). At 7 days after admission, 80.9% of patients were still hospitalized and 6.5% had died.
    Conclusions: The incidence of aspiration pneumonia with risks of severity and mortality is increasing among elderly individuals. Valid preventive measures are urgently needed based on the findings that the disease occurs in both household and elderly care facility settings, regardless of the season.
    MeSH term(s) Male ; Female ; Humans ; Aged, 80 and over ; Incidence ; Pneumonia, Aspiration/epidemiology ; Pneumonia, Aspiration/etiology ; Hospitalization ; Hospital Mortality ; Japan/epidemiology ; Retrospective Studies
    Language English
    Publishing date 2024-04-20
    Publishing country England
    Document type Journal Article
    ZDB-ID 2059871-3
    ISSN 1471-2466 ; 1471-2466
    ISSN (online) 1471-2466
    ISSN 1471-2466
    DOI 10.1186/s12890-024-03015-8
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  7. Article ; Online: Changes in regional oxygen saturation of the kidney and brain of infants during hospitalization.

    Yoshida, Daisuke / Shimokaze, Tomoyuki / Kondo, Atsushi / Toyoshima, Katsuaki / Saito, Tomoko

    Journal of clinical monitoring and computing

    2022  Volume 36, Issue 6, Page(s) 1859–1867

    Abstract: Background: In pre-term infants, the postnatal changes in the regional oxygen saturation (rSO: Methods: We performed a prospective observational study. We measured the cerebral/renal rSO: Results: The median cerebral/renal rSO: Conclusions: ... ...

    Abstract Background: In pre-term infants, the postnatal changes in the regional oxygen saturation (rSO
    Methods: We performed a prospective observational study. We measured the cerebral/renal rSO
    Results: The median cerebral/renal rSO
    Conclusions: Unlike in most infants born after the late pre-term period, the renal rSO
    MeSH term(s) Infant ; Humans ; Spectroscopy, Near-Infrared ; Oxygen/metabolism ; Oxygen Saturation ; Kidney/metabolism ; Brain ; Hospitalization
    Chemical Substances Oxygen (S88TT14065)
    Language English
    Publishing date 2022-04-20
    Publishing country Netherlands
    Document type Observational Study ; Journal Article
    ZDB-ID 1418733-4
    ISSN 1573-2614 ; 1387-1307 ; 0748-1977
    ISSN (online) 1573-2614
    ISSN 1387-1307 ; 0748-1977
    DOI 10.1007/s10877-022-00836-y
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    In stock of ZB MED Cologne/Königswinter

    Zs.A 2054: 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: First-principles quantum Monte Carlo studies for prediction of double minima for positronic hydrogen molecular dianion.

    Ito, Shumpei / Yoshida, Daisuke / Kita, Yukiumi / Tachikawa, Masanori

    The Journal of chemical physics

    2020  Volume 153, Issue 22, Page(s) 224305

    Abstract: We studied the positron ( ... ...

    Abstract We studied the positron (e
    Language English
    Publishing date 2020-12-02
    Publishing country United States
    Document type Journal Article
    ZDB-ID 3113-6
    ISSN 1089-7690 ; 0021-9606
    ISSN (online) 1089-7690
    ISSN 0021-9606
    DOI 10.1063/5.0022673
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    In stock of ZB MED Bonn / Germany

    Z 4' 49/16: Show issues

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  9. Article ; Online: Theoretical investigation of the enhancement of positron affinity by the vibration and dimerization of non-polar carbon disulfide.

    Furushima, Miku / Yoshida, Daisuke / Kita, Yukiumi / Shimazaki, Tomomi / Tachikawa, Masanori

    Physical chemistry chemical physics : PCCP

    2021  Volume 23, Issue 38, Page(s) 21512–21520

    Abstract: The positronic bound state for the non-polar carbon disulfide ( ... ...

    Abstract The positronic bound state for the non-polar carbon disulfide (CS
    Language English
    Publishing date 2021-10-06
    Publishing country England
    Document type Journal Article
    ZDB-ID 1476244-4
    ISSN 1463-9084 ; 1463-9076
    ISSN (online) 1463-9084
    ISSN 1463-9076
    DOI 10.1039/d1cp02808a
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  10. Article ; Online: Positron Binding and Annihilation Properties of Amino Acid Systems.

    Ozaki, Maya / Yoshida, Daisuke / Kita, Yukiumi / Shimazaki, Tomomi / Tachikawa, Masanori

    ACS omega

    2021  Volume 6, Issue 44, Page(s) 29449–29458

    Abstract: Despite the fact that the positron annihilation has been used in biomedical applications, the detailed mechanism of the positron annihilation on biological molecules remains poorly understood so far. In this work, we investigated the positron binding and ...

    Abstract Despite the fact that the positron annihilation has been used in biomedical applications, the detailed mechanism of the positron annihilation on biological molecules remains poorly understood so far. In this work, we investigated the positron binding and positron annihilation properties for both global minimum and hydrogen-bonded structures of 20 amino acid molecules using the multicomponent molecular orbital method. By regression analysis, we confirmed that positron affinity can increase with an increase of the permanent dipole moment of the parent amino acids as reported in previous studies, while the annihilation rate linearly increases with respect to the square root of positron affinity. By the one-particle property analyses for probabilities of electron-positron contacts, we found that delocalization characteristics of both electrons and positrons play key roles to enhance the positron annihilation rate arising from both the valence electrons in σ- and π-type molecular orbitals from 2p atomic orbitals but not from the highest occupied molecular orbital electrons, particularly for comparatively weakly bound positronic amino acid systems.
    Language English
    Publishing date 2021-10-27
    Publishing country United States
    Document type Journal Article
    ISSN 2470-1343
    ISSN (online) 2470-1343
    DOI 10.1021/acsomega.1c03409
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