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Effects of Porous Structure of Separation Column on Chromatograms Obtained by Phase-Separation Mode in HPLC

CHROMATOGRAPHIA 2025年第3期88卷 215-224页

作者： katayama, tetsuro Iharada, Takeshi Obata, Yuki Sakamaki, Hiroshi Tsukagoshi, Kazuhiko Doshisha Univ Grad Sch Sci & Engn Appl Chem Kyotanabe 6100321 Japan Chem Evaluat & Res Inst 1600 ShimotakanoSugito Machi Saitama 3450043 Japan

A novel HPLC system utilizing a phase-separation multiphase flow as the eluent has been developed, referred to as phase-separation mode. This research explores the influence of the porous structure in an octadecyl-modified silica (ODS) column (with a pore diameter of 12 nm) on chromatographic outcomes under the phase-separation mode in HPLC. The chromatograms obtained from the porous ODS column were compared to those generated with a non-porous ODS column. In preliminary experiments, twenty-four mixed solutions, comprising combinations of water/acetonitrile/ethyl acetate and water/acetonitrile, were introduced as eluents at a column temperature of 20 degrees C. A model mixture of 2,6-naphthalenedisulfonic acid (2,6-NDS) and 1-naphthol (1-NA) was injected into the system, with separation achieved in most solutions except for some highly organic solvent-rich solutions where 2,6-NDS eluted faster than 1-NA, indicating reverse-phase mode operation. Subsequently, the separation of the model mixture was assessed at 0 degrees C, and four specific ternary mixtures were analyzed in detail at both 20 degrees C and 0 degrees C. These ternary mixtures, defined by their volume ratios, exhibited a two-phase separation, establishing a phase-separation multiphase flow. Consequently, the solution flow was homogeneous at 20 degrees C and heterogeneous at 0 degrees C. For instance, solutions with water/acetonitrile/ethyl acetate ratios of 20:60:20 (organic solvent-rich) and 70:23:7 (water-rich) were introduced as eluents at both 20 degrees C and 0 degrees C. At 0 degrees C in the organic solvent-rich eluent, 1-NA eluted faster than 2,6-NDS, characteristic of the phase-separation mode. In contrast, the water-rich eluent resulted in faster elution of 2,6-NDS at both temperatures. The porous ODS column displayed improved separation efficiency at 0 degrees C compared to the non-porous column, which can be attributed to the porous effect under phase-separation conditions.

关键词： Phase-separation multiphase flow Phase-separation mode Porous ODS column HPLC

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Proposal of a Document Layout Analysis Method Adopting Pre-processing Based on Document Image Classification 16th

Proposal of a Document Layout Analysis Method Adopting Pre...

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16th International Conference on Genetic and Evolutionary Computing, ICGEC 2024

作者： Kakinoki, Kanta katayama, tetsuro Department of Computer Science and Systems Engineering Faculty of Engineering University of Miyazaki 1-1 Gakuen-Kibanadai Nishi Miyazaki889-2192 Japan

ISBN: (纸本)9789819615346

To extract important information from the document images, document layout analysis research has been carried out. Previous research analyzes document layouts only for specific document formats. This paper proposes a document layout analysis method that adopts pre-processing based on document image classification to analyze document layouts for various document formats. From the application examples, we have confirmed that the proposed method can correctly analyze document layout by using training models trained for each document format. Furthermore, to evaluate the usefulness of the proposed method, we have compared the F score of the proposed method for document layout analysis using a single training model covering various document formats and using a training model generated for each document format. As a result, we have confirmed that our proposed method is useful in document layout analysis. © The Author(s), under exclusive license to Springer Nature Singapore Pte Ltd. 2025.

关键词： document image classification document layout analysis rule-based correction

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FORMATION OF WO3/MoS2/rGO COMPOSITE PREPARED BY INTEGRATION OF PULSE LASER ABLATION AND HYDROTHERMAL METHOD TO ENHANCE OPTICAL AND PHOTOCATALYTIC ACTIVITY

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SURFACE REVIEW AND LETTERS 2025年

作者： Paul, Niloy Sawate, Akash Sugano, Satoshi katayama, tetsuro Furube, Akihiro Koinkar, Pankaj Tokushima Univ Grad Sch Sci & Technol Innovat 2-1 Minamijosanjima Cho Tokushima 7708506 Japan Tokushima Univ Inst Postled Photon 2-1 Minamijosanjima Cho Tokushima 7708506 Japan

In the field of photocatalysis and nanoparticles, two-dimensional (2D) materials, especially TMD materials and Transitional metal oxides, are very popular. The present study shows the formation of WO3/MoS2/rGO ternary composite using hybrid methods, which include laser ablation and hydrothermal methods. It is found that the shape of MoS2 bulk materials can be reduced using the laser ablation method. However, introducing the energy bridge between the molecules through hydrothermal processes allows for crystallization, size degradation, and the appropriate integration of all materials. Different kinds of characterization methods, including Raman, X-ray diffraction (XRD), field emission scanning electron microscopy (FESEM), and Ultraviolet-Visible (UV-Vis) spectroscopies, were applied to investigate the morphology, optical properties, and spectroscopic characteristics of the prepared material. The formation of the ternary nanocomposite can be clearly seen using UV-Vis spectroscopy. On the other hand, FE-SEM shows the structure of the MoS2 nanorods laying on top of GO sheets and mixing with WO3. The SEM energy dispersive X-ray spectroscopy (EDS) images show that all three elements are present, which indicates that the ternary composite of WO3, MoS2, and rGO has been formed. The crystallinity of the sample has been confirmed by XRD and Raman spectroscopy. Also, the Raman spectrum reveals that the absence of rGO is due to a change in the nature of the ternary G band and D band. The bulk rGO, bulk WO3, binary WO3/rGO, and a ternary composite of WO3/MoS2/rGO show the degradation of methylene blue degradation under UV-light irradiation as 43.5%, 57.23%, 76.23%, and 91.23% respectively. The prepared WO3/MoS2/rGO composite is recognized for its significant photocatalytic activity in experimental investigations in the field of photocatalysis.

关键词： Tungsten oxide/graphene oxide molybdenum disulfide methylene blue photodegradation

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Synthesis of naphthalene-fused imidazo[1,2-a]pyridinium salts showing green luminescence with high quantum yields and large Stokes shift

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ORGANIC & BIOMOLECULAR CHEMISTRY 2025年第18期23卷 4355-4359页

作者： Abe, Sota katayama, tetsuro Furube, Akihiro Tabata, Atsushi Yoshida, Yasushi Ueta, Shoko Arakawa, Yukihiro Minagawa, Keiji Imada, Yasushi Yagishita, Fumitoshi Tokushima Univ Dept Appl Chem 2-1 Minamijosanjima Tokushima 7708506 Japan Tokushima Univ Inst Post LED Photon 2-1 Minamijosanjima Tokushima 7708506 Japan Tokushima Univ Dept Biosci & Bioind 2-1 Minamijosanjima Tokushima 7708513 Japan Chiba Univ Grad Sch Engn Dept Appl Chem & Biotechnol Chiba 2638522 Japan

We have synthesized naphthalene-fused imidazo[1,2-a]pyridines by a novel electrophilic iodocyclization of 2-alkynyl-3-arylimidazo[1,2-a]pyridines. Notably, their quaternized salts exhibited green emission with unexpec... 详细信息

关键词： Green Synthesis

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Laser-ablation synthesis of novel tungsten disulfide nanostructures in liquid and their charge transfer dynamics with gold nanoparticles

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Photochemical & photobiological sciences : Official journal of the European Photochemistry Association and the European Society for Photobiology 2025年 2025 May 8页

作者： Kohei Sasaki Pankaj Koinkar tetsuro katayama Akihiro Furube Institute of Post LED Photonics (pLED) Tokushima University 2-1 Minamijosanjima-cho Tokushima 770-8506 Japan. Institute of Post LED Photonics (pLED) Tokushima University 2-1 Minamijosanjima-cho Tokushima 770-8506 Japan. furube.akihiro@tokushima-u.ac.jp.

In recent years, tungsten disulfide (WS₂), a type of 2D nanomaterial, has garnered significant attention as a promising new material due to its unique properties. Research efforts are underway to explore its various applications. In this study, we employed a liquid-phase laser ablation technique using two different pulse lasers, with a 10 ns or 130 fs pulse duration, to fabricate WS₂ nanostructures and conducted thorough evaluations of their physical properties. Additionally, we fabricated and evaluated WS₂-gold nanocomposites by decorating WS₂ with gold nanoparticles. Femtosecond transient absorption measurements revealed that in samples subjected to the shorter pulse width, the free carrier relaxation rate up to recombination was slower, with free carriers disappearing within tens of picoseconds, leaving only trapped species as long-lived entities. Furthermore, in gold-decorated samples, the interaction between gold nanoparticles and WS₂ suggested that excited electrons underwent interfacial charge transfer and formed charge separated states, resulting in a slower relaxation time before recombination.

关键词： 2D material Charge transfer Hybrid material Laser ablation Transient absorption

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Evacuation Support System for Tsunami Disasters that Considers Shelter Congestion 16th

Evacuation Support System for Tsunami Disasters that Consi...

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16th International Conference on Genetic and Evolutionary Computing, ICGEC 2024

作者： Nishi, Hidetaka Nabeyama, Keita Usuzaki, Shotaro Aburada, Kentaro Yamaba, Hisaaki katayama, tetsuro Park, Mirang Okazaki, Naonobu University of Miyazaki Miyazaki Japan Kanagawa Institute of Technology Atsugi Japan

ISBN: (纸本)9789819615346

When a tsunami occurs, an evacuation support system capable of providing information on evacuation routes and shelter locations would enable evacuations to be conducted more swiftly and safely. In previous research, a proposal was made for an evacuation support system using low-power, long-distance communication. However, a challenge arose when shelter locations reached full capacity, requiring information to be shared, which in turn necessitated redirection of evacuees to alternative shelters. Therefore, in this study, a method for sharing shelter congestion information at an earlier stage was developed. The method of sharing based on the remaining capacity of shelters increased evacuation completion by up to 29 evacuees in an evacuee population of 1000. © The Author(s), under exclusive license to Springer Nature Singapore Pte Ltd. 2025.

关键词： Traffic congestion

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Optimizing boron nitride nanostructures using femtosecond laser ablation for enhanced material properties

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INTERNATIONAL JOURNAL OF MODERN PHYSICS B 2025年

作者： Tonape, Siddhant M. katayama, tetsuro Koinkar, Pankaj Furube, Akihiro Tokushima Univ Grad Sch Sci & Technol Innovat 2-1 Minamijosanjima Cho Tokushima 7708506 Japan Tokushima Univ Inst Postled LED Photon 2-1 Minamijosanjima Cho Tokushima 7708506 Japan

This study investigates the effect of femtosecond laser ablation on boron nitride (BN) nanoparticles, utilizing a 150mm focal lens and varying ablation durations (2, 4 and 8h). Characterization through scanning electron microscopy (SEM), dynamic light scattering (DLS) and UV-Vis absorption spectroscopy revealed significant changes in particle size and morphology. SEM confirmed a transition from uneven, large aggregates to more uniform nanosized particles after ablation. DLS analysis showed a reduction in particle size, with the smallest size (similar to 80nm) observed after 8h of ablation. The UV-Vis spectra demonstrated a decrease in absorbance intensity with longer ablation times, supporting the fragmentation and dispersion observed in SEM and DLS results. These findings demonstrate the effectiveness of femtosecond laser ablation in producing well-dispersed, nanoscale BN particles, highlighting its potential for applications in nanotechnology and material science.

关键词： Boron nitride femtosecond laser ablation dynamic light scattering UV-visible spectroscopy field emission scanning electron microscopy

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Enhancement of Design Level Class Decomposition using Evaluation Process

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INTERNATIONAL JOURNAL OF ADVANCED COMPUTER SCIENCE AND APPLICATIONS 2022年第8期13卷 130-139页

作者： Priyambadha, Bayu katayama, tetsuro Univ Miyazaki Interdisciplinary Grad Sch Agr & Engn Miyazaki Japan Univ Brawijaya Fac Comp Sci Malang Jawa Timur Indonesia

Refactoring on the design level artifact such as the class diagram was already done using the threshold-based agglomerative hierarchical clustering method, specifically class decomposition. The approach produced a better cluster based on the label name similarity of attribute and method. But, some problems emerge from the experiment result. The negative Silhouettes element still exist in the cluster. And, there is an unusable cluster that only consists of one attribute element. This paper has proposed the evaluation process to optimize the result of clustering. This evaluation process is an additional process that aims to move the negative Silhouettes element to the other cluster. The movement is also to get the better value of element Silhouettes value. The evaluation process can produce a better result for clusters. The clusters produced from the evaluation process have higher Silhouettes values. The average Silhouettes value is increased by about 40%. Ultimately, the result shows no unusable cluster as mentioned in the previous research.

关键词： Refactoring design level refactoring software refactoring class decomposition software quality

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Design Level Class Decomposition using the Threshold-based Hierarchical Agglomerative Clustering

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INTERNATIONAL JOURNAL OF ADVANCED COMPUTER SCIENCE AND APPLICATIONS 2022年第3期13卷 57-64页

作者： Priyambadha, Bayu katayama, tetsuro Univ Miyazaki Interdisciplinary Grad Sch Agr & Engn Miyazaki Japan Univ Brawijaya Fac Comp Sci Malang Jawa Timur Indonesia

Refactoring activity is essential to maintain the quality of a software's internal structure. It decays as the impact of software changes and evolution. Class decomposition is one of the refactoring processes in maintaining internal quality. Mostly, the refactoring process is done at the level of source code. Shifting from source code level to design level is necessary as a quick step to refactoring and close to the requirement. The design artifact has a higher abstraction level than the source code and has limited information. The challenge is to define new metrics needed in class decomposition using the design artifact's information. Syntactic and semantic information from the design artifact provides valuable data for the decomposition process. Class decomposition can be done at the level of design artifact (class diagram) using syntactic and semantic information. The dynamic threshold-based Hierarchical Agglomerative Clustering produces a more specific cluster that is considered to produce a single responsibility class.

关键词： Refactoring design level refactoring software refactoring hierarchical clustering class decomposition

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The Impact of Design-level Class Decomposition on the Software Maintainability

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INTERNATIONAL JOURNAL OF ADVANCED COMPUTER SCIENCE AND APPLICATIONS 2023年第4期14卷 405-413页

作者： Priyambadha, Bayu katayama, tetsuro Univ Miyazaki Interdisciplinary Grad Sch Agr & Engn Miyazaki Japan Univ Brawijaya Fac Comp Sci Malang Jawa Timur Indonesia

The quality of the software's internal structure tends to decay due to the adaptation to environmental changes. Therefore, it is beneficial to maintain the internal structure of the software to benefit future phases of the software life cycle. A common correlation exists between decaying internal structures and problems like software smell and maintenance costs. Refactoring is a process to maintain the internal structure of software artifacts based on the smell. Decomposition of classes one of the most common refactoring actions based on Blob smell performed at the source code level. Moving the class decomposition process to the design artifact seems to affect the quality and maintainability of the source code positively. Therefore, studying the impact of design-level class decomposition on source code quality and software maintainability is essential to ascertain the benefits of implementing design-level class decomposition. The metrics-based evaluation shows that the design-level class decomposition positively impacts the source code quality and maintainability with the rank biserial value is 0.69.

关键词： -Design level refactoring class decomposition class diagram decomposition software quality software internal quality software maintainability

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