Publications by authors named "Kiriyama H"

Article Synopsis
  • A laser pulse in a magnetically confined fusion plasma creates a microscopic cavity by removing electrons and causing a Coulomb explosion of ions.
  • Simulations suggest that this tiny cavity can collapse within 10 nanoseconds, influenced by factors like size and electric fields.
  • Researchers are exploring whether these collapsing cavities can create stable micro-cavities that might be useful for applications in plasma technology, such as diagnostics and control methods.
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Fusicoccin-A (FC-A) is a diterpene glucoside produced by a pathogenic fungus. Since its discovery, FC-A has been widely recognized as a phytotoxin that induces stomatal opening and leaf wilting, eventually leading to plant death. In this study, we present the first evidence that FC-A enhances plant growth by stabilizing the protein-protein interaction between plasma membrane (PM) H-ATPase and 14-3-3 in guard cells.

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  • A new ion diagnostic method has been created for laser-driven ion acceleration using fluorescent nuclear track detectors (FNTDs), which record particle tracks without needing chemical etching.
  • This method utilizes a confocal laser microscope to observe color centers associated with ion energy deposits and allows for 3D tracking of these particles through depth-layered images.
  • To efficiently analyze ion tracks among overlapping signals from electrons and photons, an automated detection and tracking system using support vector classifiers has been developed and tested in a specific laser experiment.
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  • Ischemic heart disease is a major global health issue, and this study aimed to assess the accuracy of SurvTrace, a deep learning model, in predicting recurrent cardiovascular events compared to a traditional scoring system.
  • The research involved analyzing data from nearly 4,000 patients who underwent procedures for heart issues, monitoring them for major adverse events over two years while comparing two predictive models.
  • Results showed SurvTrace had a higher prognostic accuracy (c-index of 0.72) than the conventional model (c-index of 0.64) and was better at distinguishing high-risk patients from others, making it a promising tool for improving patient outcomes.
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  • The study explores the use of deep neural networks (DNNs) for multimodality risk assessment in patients with ischemic heart disease (IHD), incorporating both 12-lead ECGs and chest X-rays (CXRs) to predict major adverse cardiovascular events (MACEs).
  • Researchers categorized 2,107 patients into four risk groups based on DNN outputs, revealing that the Dual-modality high-risk group had the highest incidence of MACEs.
  • The analysis showed that the Dual-modality high-risk group had a significantly higher risk of MACEs compared to other risk groups, highlighting the potential benefit of using a multimodal approach for assessing patient risk in IHD.
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Diastolic stiffness coefficient (β) and end-diastolic elastance (Eed) are ventricular-specific diastolic parameters. However, the diastolic function of right ventricle had not been investigated sufficiently due to the lack of established evaluation method. We evaluated the validity of these parameters calculated using only data of right heart catheterization (RHC) and assessed it in patients with restrictive cardiomyopathy (RCM) and cardiac amyloidosis.

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We present a method extending scanning third-order correlator temporal pulse evolution measurement capabilities of high power short pulse lasers to spectral sensitivity within the spectral range exploited by typical chirped pulse amplification systems. Modelling of the spectral response achieved by angle tuning of the third harmonic generating crystal is applied and experimentally validated. Exemplary measurements of spectrally resolved pulse contrast of a Petawatt laser frontend illustrate the importance of full bandwidth coverage for the interpretation of relativistic laser target interaction in particular for the case of solid targets.

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Laser-driven ion sources are a rapidly developing technology producing high energy, high peak current beams. Their suitability for applications, such as compact medical accelerators, motivates development of robust acceleration schemes using widely available repetitive ultraintense femtosecond lasers. These applications not only require high beam energy, but also place demanding requirements on the source stability and controllability.

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  • Fractional flow reserve (FFR) is a standard method for assessing heart issues, but its use is limited due to time, cost, and discomfort associated with the procedure.
  • A new method called saline-induced Pd/Pa ratio (SPR) may offer a simpler alternative to FFR, yet its clinical significance is still uncertain.
  • The study found that SPR had a stronger correlation with FFR compared to resting full-cycle ratio (RFR) and showed superior diagnostic accuracy, suggesting SPR could effectively evaluate coronary artery stenosis.
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Background: With the growing prevalence of atrial fibrillation (AF), concomitant atrial functional tricuspid regurgitation (FTR) is increasing. In this study, we aimed to elucidate the incidence of significant atrial FTR and its association with tricuspid valvular (TV) deformation in patients with persistent AF.

Methods: We retrospectively enrolled 344 patients (73.

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  • Coronary angiography (CAG) is the gold standard for assessing coronary arteries, particularly in acute coronary syndrome (ACS) cases, but the impact of aging on CAG imaging has not been fully studied.
  • Researchers developed a deep neural network (DNN) to estimate vascular age from CAG videos of patients, achieving a mean absolute error of 4 years and demonstrating predictive capacity for clinical outcomes.
  • The study found that older predicted vascular age was linked to a higher incidence of major adverse cardiovascular events, even after adjusting for additional health factors, indicating its potential as a vital prognostic tool in ACS management.
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Multi-MeV high-purity proton acceleration by using a hydrogen cluster target irradiated with repetitive, relativistic intensity laser pulses has been demonstrated. Statistical analysis of hundreds of data sets highlights the existence of markedly high energy protons produced from the laser-irradiated clusters with micron-scale diameters. The spatial distribution of the accelerated protons is found to be anisotropic, where the higher energy protons are preferentially accelerated along the laser propagation direction due to the relativistic effect.

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Graphene is known as an atomically thin, transparent, highly electrically and thermally conductive, light-weight, and the strongest 2D material. We investigate disruptive application of graphene as a target of laser-driven ion acceleration. We develop large-area suspended graphene (LSG) and by transferring graphene layer by layer we control the thickness with precision down to a single atomic layer.

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Aim: Using a nationwide epidemiological database, we sought to examine whether there was a sex difference in the association between lipid profiles and subsequent cardiovascular disease (CVD) in young adults.

Methods: Medical records of 1,909,362 young adults (20-49 years old) without a prior history of CVD and not taking lipid-lowering medications were extracted. We conducted multivariable Cox regression analyses to identify the association between the number of abnormal lipid profiles and incident CVD.

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Background Studies of the association of hypertension with incident colorectal cancer (CRC) may have been confounded by including individuals taking antihypertensive medication, at high risk for CRC (ie, colorectal polyps and inflammatory bowel disease), or with shared risk factors (eg, obesity and diabetes). We assessed whether adults with untreated hypertension are at higher risk for incident CRC compared with those with normal blood pressure (BP), and whether any association is evident among individuals without obesity or metabolic abnormalities. Methods and Results Analyses were conducted using a nationwide health claims database collected in the JMDC Claims Database between 2005 and 2018 (n=2 220 112; mean age, 44.

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We developed an optically synchronized highly stable frequency-doubled Nd:YAG laser with sub-nanosecond pulse duration. The 1064 nm seed pulses generated by soliton self-frequency shift in a photonic crystal fiber from Ti:sapphire oscillator pulses were stabilized by controlling input pulse polarization. The seed pulses were amplified to 200 mJ by diode-pumped amplifiers with a high stability of only <0.

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According to the statistics for 2018 in Japan, cardiovascular disease and cerebrovascular disease were the most common causes of death (cardiovascular disease with 208,210, cerebrovascular disease with 108,165), and these two diseases account for 23.2% of all deaths. Stroke, especially cerebral hemorrhage, was the main cause of death in Japan after World War II.

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Background: Heart failure (HF) is increasing in prevalence worldwide. We explored whether adults with trace and positive proteinuria were at a high risk for incident HF compared with those with negative proteinuria using a nationwide epidemiological database.

Methods: This is an observational cohort study using the JMDC Claims Database collected between 2005 and 2020.

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Onco-cardiology is the emerging field, and the concept of shared risk factor holds an important position in this field. The increasing prevalence of colorectal cancer (CRC) in young adults is a critical epidemiological issue. Although metabolic syndrome, which is a major risk factor for cardiovascular disease, is known to be associated with CRC incidence in middle-aged and elderly individuals, it is unclear whether this association is present in young adults.

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Mitigating the environmental impact of nitrogen (N) derived from agricultural production is a significant issue in our progression towards a sustainable society. This study aims to estimate the N stock (i.e.

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Background: Extensive data support the clinical benefit of cardiac rehabilitation (CR) for patients with chronic heart failure (HF). However, whether CR could be beneficial for patients hospitalized for acute heart failure remains unclear.

Methods: We retrospectively analyzed data from the Diagnosis Procedure Combination database, a nationwide inpatient database.

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