Article
Thermodynamics
Sotaro Nishioka, Shinji Masuyama, Akiko T. Saito
Summary: This study proposes a non-magnetic regenerator material, Ag2O, which exhibits optical phonon degree of freedom even at cryogenic temperatures, for use in regenerative cryocoolers. Experimental results show that the low temperature specific heat of Ag2O is enhanced by the contribution of optical phonons, making it advantageous in terms of cooling performance.
Article
Thermodynamics
Ji Zhou, Xiaoqing Zhi, Zhuqing Ni, Rongfei Cao, Zhimin Liu, Changning Huang, Bo Wang, Guoliang Li, Chen Huang, Yanhu Zhang
Summary: This study investigates the regenerative packing sections and pulse tube dimensions of two-stage gas-bearing pulse tube cryocoolers (PTCs) under harsh working conditions. The results show excellent cooling capacity and high operating frequency, making gas-bearing PTCs promising for cryogenic cooling and remote sensing applications in aerospace.
THERMAL SCIENCE AND ENGINEERING PROGRESS
(2023)
Article
Thermodynamics
Luca Cirillo, Adriana Greco, Claudia Masselli
Summary: This paper presents a detailed analysis for efficiently designing the first Italian elastoCaloric prototype. Different geometries were compared through numerical simulations to optimize the geometric and operational parameters before constructing the prototype. The results show a temperature drop of 21.5 K and cooling power of 538 W with a coefficient of performance greater than 6.
APPLIED THERMAL ENGINEERING
(2023)
Article
Nanoscience & Nanotechnology
J-M. Le Floch, HuiMin Shao, EnCai Zhong, XueCen Deng, Zehuang Lu
Summary: By analyzing the thermal properties of cryocoolers, the independence of heat distribution and sensitivity to temperature were discovered, validating the reliability of the established model in experiments.
Article
Materials Science, Ceramics
Breno R. Barrioni, Sandhra M. de Carvalho, Parichart Naruphontjirakul, Elizabeth Norris, Nicole L. Kelly, John V. Hanna, Julian R. Jones, Marivalda de M. Pereira
Summary: Novel monodispersed spherical dense BGNPs with a diameter of 92 nm and cobalt as the pro-angiogenic ion were obtained using a modified Stober method. The controlled release of Co2+ ions in culture media indicated the great potential of these materials as intracellular ion delivery systems with therapeutic properties. The study confirmed the presence of Co2+ species and the role of Co and Ca as network modifiers in the silica glass through various analytical techniques.
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
(2022)
Article
Thermodynamics
Cole T. Fleet, Anthony G. Straatman
Summary: This study presents a method for determining the conduction shape factor for complex porous media by performing pore-level simulations on mathematically-generated geometric models. The shape factor is found to be dependent on both porosity and pore diameter, and can be characterized by a quadratic expression. The results are validated by comparing computations of conjugate heat transfer using pore-level and volume-averaged approaches.
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
(2021)
Article
Thermodynamics
Qiang Cao, Miaomiao Wang, Bin Huo, Mingkai Luan, Peng Li, Qinyu Zhao, Bo Wang, Zhihua Gan
Summary: This paper investigates a method of improving the performance of 4 K refrigerators by increasing the cross-sectional area of the regenerator at the colder part. Results show that the variable cross-sectional refrigerator achieves a lower no-load temperature and an increased coefficient of performance (COP) compared to the uniform one. The improvement is more significant at lower refrigeration temperatures, but tends to vanish at around 6 K. Additionally, this method also has some side effects that hinder the positive effects.
APPLIED THERMAL ENGINEERING
(2023)
Article
Thermodynamics
Xiaoqin Zhi, Rongfei Cao, Chen Huang, Kai Wang, Limin Qiu
Summary: The study investigated the cooling performance of regenerative materials HoCu2 and Gd2O2S at liquid helium temperatures, finding that Gd2O2S can improve regenerator performance below 5.6K temperature. Experimental results demonstrated that Gd2O2S can enhance performance, but excessive use may deteriorate performance.
APPLIED THERMAL ENGINEERING
(2021)
Article
Thermodynamics
P. Govindappa, P. Trevizoli, I Niknia, T. Christiaanse, R. Teyber, A. Rowe
Summary: Magnetocaloric materials with first-order magnetic phase transitions are low-cost working materials in magnetic heat pumping cycles, but hysteresis associated with first order transitions remains a challenge. A developed one-dimensional active magnetic regenerator model accounts for thermal and magnetic hysteresis, showing good agreement with experimental data. Predicted cooling power can be well estimated using cyclic measurements of adiabatic temperature change while disregarding hysteresis.
APPLIED THERMAL ENGINEERING
(2021)
Article
Chemistry, Physical
Zhongya Guo, Jiashi Wang, Lili Fu, Fangfang Qin, Huiyu Li, Lin Ge, Ke Zhang, Bin Li, Wenzhong Shen
Summary: A simple one-pot method was proposed to synthesize Sb@C enantioseparation material with a controllable spherical core-shell structure. The formation mechanism of the core-shell structure was clarified. The capping of tartaric acid enantiomer on the Sb-S substance and the possible separation mechanism by hydrogen bonding based on sterical matching were verified. The structure and enantioseparation capacity of the Sb@C materials can be controlled by adjusting the ratio of Sb/S. This work presents a feasible and relatively universal strategy to design enantioseparation materials with potential application.
APPLIED SURFACE SCIENCE
(2022)
Article
Materials Science, Multidisciplinary
Ziling Wu, Yongzheng Zhang, Yanli Wang, Chunyin Shen, Liang Zhan
Summary: Oral adsorbents can effectively treat chronic kidney disease by removing endogenous toxins from the gastrointestinal tract. A novel polystyrene-based spherical activated carbon adsorbent with an ultrahigh specific surface area and good particle strength was prepared via air-oxidation and steam activation. This adsorbent showed high creatinine adsorption capacity and excellent selectivity for different molecular weight adsorbates, and was not significantly affected by pH variations. The mechanism of creatinine adsorption on the adsorbents was proposed to involve Van der Waals force and hydrogen bond as the driving forces.
Review
Energy & Fuels
Amrit Kumar Thakur, Mohammad Shamsuddin Ahmed, Jimin Park, Rajendran Prabakaran, Shaji Sidney, Ravishankar Sathyamurthy, Sung Chul Kim, Somasundaram Periasamy, Jaekook Kim, Jang-Yeon Hwang
Summary: Potassium-ion batteries (KIBs) have garnered interest as a promising alternative to Li-ion batteries due to the abundance of potassium resources, affordability, and superior electrochemical properties. However, the development of KIBs is hindered by the slow progress in appropriate anode materials, with carbon nanomaterials being identified as a promising option.
INTERNATIONAL JOURNAL OF ENERGY RESEARCH
(2022)
Article
Thermodynamics
Zina Meddeb
Summary: This study aimed to model magnetic entropy and determine the magnetocaloric effect of materials across different temperature ranges using thermodynamic and statistical approaches. Several models were developed and validated, allowing for the determination of maximum magnetocaloric effect and Curie temperature, and providing a new method for selecting materials in magnetic refrigeration systems.
JOURNAL OF THERMAL ANALYSIS AND CALORIMETRY
(2023)
Article
Thermodynamics
Sergiu Lionte, Alexander Barcza, Michel Risser, Christian Muller, Matthias Katter
Summary: This paper presents the optimization of LaFeSi-based alloys for magnetocaloric applications, including experimental results with specific layering of materials with different Curie temperatures. The potential of LaFeSi-based alloys to replace Gd-based alloys and increase cooling power while reducing costs is demonstrated through endurance testing.
INTERNATIONAL JOURNAL OF REFRIGERATION
(2021)
Article
Computer Science, Artificial Intelligence
Honglei He, Yuxuan He, Fang Wang, Wenming Zhu
Summary: In this study, an improved K-means algorithm (IK-means) is proposed to enhance clustering efficiency for non-spherical data. By clustering the original dataset into high-density sub-clusters and merging them, IK-means algorithm shows good clustering capability for data of arbitrary shape and is faster for larger datasets compared to DBSCAN and KGFCM.
Article
Chemistry, Physical
Dasom Kim, Yusuke Hirayama, Kenta Takagi, Hansang Kwon
Summary: The development of bare metal powder using the LO-ITP method enables low-temperature sintering for conductive interfaces, which can be utilized in various industries. By peeling the surface of Al particles, the LO-ITP method achieves surface cleaning and produces bare metal micro-sized powders. The interfaces between bare Al powders can achieve direct contact at a lower temperature than the conventional sintering temperature.
Article
Otorhinolaryngology
Sayaka Yokoi, Naoki Nishio, Takashi Maruo, Mariko Hiramatsu, Nobuaki Mukoyama, Hidenori Tsuzuki, Akihisa Wada, Naoki Atsuta, Daisuke Ito, Takashi Tsuboi, Gen Sobue, Masahisa Katsuno, Yasushi Fujimoto, Michihiko Sone
Summary: This study retrospectively analyzed the clinical and surgical data of 26 patients with ALS who underwent laryngeal closure surgery. The results showed that laryngeal closure surgery can safely maintain swallowing function and reduce the risk of chronic aspiration in patients with ALS.
Article
Otorhinolaryngology
Yuka Kawade, Yasue Uchida, Saiko Sugiura, Hirokazu Suzuki, Mariko Shimono, Erina Ito, Anna Yoshihara, Izumi Kondo, Takashi Sakurai, Naoki Saji, Tsutomu Nakashima, Emiko Shimizu, Yasushi Fujimoto, Hiromi Ueda
Summary: The study aimed to evaluate the relationship between hearing ability and cognitive domains and determine the changes after introducing a hearing aid for 6 months. Pure tone audiometry and monosyllabic word discrimination score were used to assess hearing ability, and the Mini-Mental State Examination (MMSE) was used to evaluate cognitive domains. The results indicated a significant association between hearing ability and cognitive domains in individuals with impaired cognitive functions, suggesting a potential relationship between cognitive domains, hearing ability, and auditory compensation.
AURIS NASUS LARYNX
(2023)
Article
Oncology
Shunji Takahashi, Nobuhiko Oridate, Kaoru Tanaka, Yasushi Shimizu, Yasushi Fujimoto, Koji Matsumoto, Tomoya Yokota, Tomoko Yamazaki, Masanobu Takahashi, Tsutomu Ueda, Nobuhiro Hanai, Hironori Yamaguchi, Hiroki Hara, Tomokazu Yoshizaki, Ryuji Yasumatsu, Masahiro Nakayama, Kiyoto Shiga, Takashi Fujii, Kenji Mitsugi, Kenichi Takahashi, Nijiro Nohata, Burak Gumuscu, Ramona F. Swaby, Makato Tahara
Summary: The study reports the efficacy of pembrolizumab in Japanese patients with R/M HNSCC, suggesting it as a first-line treatment option. Treatment-related adverse events occurred at a relatively high rate, but the overall safety profile was acceptable.
INTERNATIONAL JOURNAL OF CLINICAL ONCOLOGY
(2022)
Article
Biochemistry & Molecular Biology
Shunpei Yamanaka, Susumu Suzuki, Hideaki Ito, Karnan Sivasundaram, Ichiro Hanamura, Ikuko Okubo, Kazuhiro Yoshikawa, Shoya Ono, Taishi Takahara, Akira Satou, Toyonori Tsuzuki, Ryuzo Ueda, Tetsuya Ogawa, Yasushi Fujimoto
Summary: This study successfully established three mucoepidermoid carcinoma cell lines and characterized their cytogenetic and biochemical features. These cell lines can be used to investigate the disease progression mechanisms and develop novel therapeutics for mucoepidermoid carcinoma.
INTERNATIONAL JOURNAL OF MOLECULAR SCIENCES
(2023)
Article
Mechanics
Seiya Kosako, Mariko Hiramatsu, Yasushi Fujimoto, Yoshiyuki Tsuji
Summary: This study examines the impact of downstream flow in the voice prosthesis during shunt vocalization on the esophageal wall in order to identify the key factors influencing sound generation in the esophagus. Simulations of the trachea and esophagus were performed to measure flow through the voice prosthesis and calculate pressure distribution in the esophageal section. The results demonstrate that temporal variations in pressure downstream of the voice prosthesis and its impingement on the esophageal wall are the primary sources of sound generation within the esophageal section, with the frequency of the generated sound being dependent on the oscillations of the valve.
Article
Oncology
Takashi Maruo, Yasushi Fujimoto, Sayaka Yokoi, Mayu Shigeyama, Naoki Nishio, Mariko Hiramatsu, Michihiko Sone
Summary: Endoscopic cricopharyngeal myotomy (ECPM) is a safe and minimally invasive technique used to treat patients with difficulty in opening their esophageal inlet. A new method using a curved rigid laryngoscope was described for ECPM in patients with dysphagia due to pharyngeal residue. The procedure showed good outcomes in eliminating residue and shortening mealtimes.
MOLECULAR AND CLINICAL ONCOLOGY
(2023)
Article
Chemistry, Physical
Dasom Kim, Yusuke Hirayama, Zheng Liu, Kenta Takagi, Makoto Kobashi
Summary: In this study, a high hardness of 1.4 GPa and electrical conductivity of 1.52 x 107 S/m are achieved in an Al-carbon nanotube (CNT) composite using bare Al nanopowder as a metal matrix. The highly dispersed CNTs and controlled Al/CNT interface are achieved due to the similar size of Al nanopowder and less oxide layers on the Al particle surface. Fine Al4C3 grains formed at the Al/CNT interface enhance the hardness while the remaining Al/Al interface preserves the electrical conductivity. The electrical conductivity of the Al-CNT composites in this study is 33 times higher than that of Al-nanocarbons with the same hardness level.
JOURNAL OF ALLOYS AND COMPOUNDS
(2023)
Article
Materials Science, Multidisciplinary
Jian Wang, Yusuke Hirayama, Kazuyuki Suzuki, Kwangjae Park, Zheng Liu, Kenta Takagi, Kimihiro Ozaki
JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
(2023)
Article
Optics
Yuya Koyama, Yuki Matsui, Yasushi Fujimoto
Summary: We demonstrated a pulse laser with a fundamental repetition rate of 1 GHz using Yb-Mg-doped silica glass fiber. The laser cavity consisted of a 102-mm-long YbMgSGF as the laser medium and a semiconductor saturable-absorber mirror as a mode-locker. The laser output power reached 5.93 mW with a slope efficiency of 3.6% and a lasing threshold power of 5.3 mW.
OPTICS COMMUNICATIONS
(2023)
Article
Optics
William R. Kerridge-Johns, A. Srinivasa Rao, Yasushi Fujimoto, Takashige Omatsu
Summary: A compact vortex source with red, orange, and dual wavelength emission is presented, using a standard microscope slide as an interferometric output coupler. High quality first order vortex modes are achieved in this setup. The device demonstrates broad emission bands in the orange, red, and near-infrared regions, with potential for green and cyan emission. It is a low-cost, compact, and accessible device for visible vortex applications.
Article
Nanoscience & Nanotechnology
Akihide Hosokawa, Yusuke Hirayama
Summary: Sm2Fe17N3 coarse powder was consolidated into a disc magnet using high-pressure torsion technique and achieved grain subdivision within the powder particles, resulting in a bulk magnet with increased coercivity. The generation of grain subdivision was found to be associated with the motion of dislocations in non-basal planes. However, excessively large strain led to the loss of the hard magnetic phase and the coercivity.
SCRIPTA MATERIALIA
(2023)
Article
Medicine, Research & Experimental
Miki Kambe, Kazunobu Hashikawa, Keisuke Takanari, Shunjiro Yagi, Kazuhiro Toriyama, Katsumi Ebisawa, Naoki Nishio, Takashi Maruo, Nobuaki Mukoyama, Yasushi Fujimoto, Masazumi Fujii, Kiyoshi Saito, Masakatsu Takahashi, Yuzuru Kamei
Summary: This study reports the experience and long-term outcome of lateral skull base reconstruction with a free omental flap, with a special focus on facial nerve recovery. The study includes 16 patients who underwent the procedure, and the main outcome measures were postoperative complications and facial nerve recovery. The use of a free omental flap is a reliable method for lateral skull base reconstruction, particularly when facial nerve reconstruction is required.
NAGOYA JOURNAL OF MEDICAL SCIENCE
(2023)
Article
Medicine, General & Internal
Tessei Kuruma, Tetsuya Ogawa, Mariko Arimoto, Kinga Yo, Yasushi Fujimoto
Summary: Primary and metastatic malignancies in the sinuses are rare and diverse in histology. The role of fine-needle aspiration cytology (FNAC) and its cytomorphologic characteristics in these tumors have not been specifically addressed. Here, we present two cases of suspected malignant maxillary sinus tumors in elderly patients, aged 85 and 90, who underwent FNAC after unsuccessful tissue biopsies. The diagnoses of squamous cell carcinoma (SCC) and adenocarcinoma were made using FNAC, with the latter case showing identifiable individual cells using the cell block method.
CUREUS JOURNAL OF MEDICAL SCIENCE
(2023)
Article
Oncology
Toshifumi Tomioka, Takeshi Beppu, Tetsuro Onitsuka, Yasushi Fujimoto, Kazuyoshi Kawabata, Kazuto Matsuura, Takashi Fujii, Ryuichi Hayashi, Takahiro Asakage
Summary: The metastatic rate of Levels IIB and V was low in patients classified as cN0. Omitting Level V dissection may be an option in surgical strategies aimed at maintaining arm abduction function. The recovery of arm abduction function post-surgery is related to the arm abduction test score at 1 month post-operatively.
JAPANESE JOURNAL OF CLINICAL ONCOLOGY
(2023)
