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Photoluminescence and radioluminescence properties of (Gd8Ca2)(SiO4)6O2 crystals with different concentrations of Ce

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Journal of Rare Earths 2017年第11期35卷 1071-1076页

作者： Takuya Igashira masaki Mori Go Okada Noriaki Kawaguchi Takayuki Yanagida Graduate School of Materials Science Nara Institute of Sdence and Technology (NAIST) 8916-5 Takayama Ikoma Nam Japan

(GdCa)(SiO)Oapatite crystals doped with different concentrations of Ce were synthesized by the Floating Zone(FZ) method, and we have evaluated the photoluminescence(PL) and radio luminescence(RL) properties. In PL, an emission band appeared around 400 nm under excitation at 300 nm due to the5 d-4 f transitions of Ce3+. The PL decay curves were approximated by a second-order exponential decay function, and the derived decay time constants ranged around 20-25 ns and 40-480 ns. Similar emission was observed in RL, but the decay time constants were much longer than those in PL. The RL afterglow was the lowest in the 1.0% Ce-doped sample. The 1.0% and 2.0% Ce-doped samples showed a full-energy peak in the pulse height spectrum measured underAm 5.5 MeV α-ray irradiation, and the absolute scintillation light yields were estimated to be around 55 and 36 ph/5.5 MeV-a, respectively.

关键词： Scintillator Apatite Ce^(3+) 5d-4f transition

Fabrication of ZrC/ZrB₂/C Composites Having High Mechanical Properties at Elevated Temperatures

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Materials Sciences and Applications 2022年第4期13卷 232-248页

作者： Kai Matsumoto masaki Kato Ken Hirota Toshiyuki Nishimura Department of Molecular Chemistry & Biochemistry Faculty of Science & Engineering Doshisha University Kyotanabe Japan National Institute for Materials Science Tsukuba Japan

Ultra-high temperature ceramics (UHTCs) are most recently getting much attention for structural parts of hypersonic missiles with their cruising speed of more than Mach 5. Most of the UHTCs are poor sinterability carbides, nitrides, and borides. Therefore, they have been studied and developed for a long time. However, there are still many problems to solve. In this paper, based on the solid-state reaction presented as an equation of (x + y)·ZrC + 2·y·B → x·ZrC + y·ZrB2 + y·C, three-phase ZrC/ZrB2/C composites have been fabricated from ZrC and amorphous B powders using pulsed electric-current pressure sintering at 1373 to 2173 K for 6.0 × 102 s under 50 MPa in a vacuum. ZrC/ZrB2/C = 30/70/C~70/30/C vol% composites with the relative densities Dr of 96.6 to 98.7% were obtained at 2073 K. The 60/40/C vol% composite revealed high bending strength σb (554 MPa), Vickers hardness Hv (19.2 GPa) and moderate fracture toughness KIC (5.25 MPa·m1/2) at room temperature. Furthermore, all composites showed elastic deformation up to 1873 K and revealed σb more than 600 MPa at this temperature, in addition, some composites showed higher σb than 900 MPa at the same temperature. These high mechanical behaviors are discussed with those of the simple binary ZrC/ZrB2 composites which were fabricated under the same conditions except for their starting materials. The best mechanical properties of binary composites were σb (474 MPa), Hv (18.5 GPa), and KIC (4.45 MPa·m1/2) at room temperature, and σb of 400 - 700 MPa at 1873 K. Overall, three-phase composites, nevertheless including soft carbon, have higher mechanical properties than the binary composites.

关键词： ZrC ZrB2 C Composites Pulsed Electric-Current Pressure Sintering Mechanical Properties

Current status and future perspectives for the treatment of resectable locally advanced esophagogastric junction cancer:A narrative review

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World Journal of Gastroenterology 2023年第24期29卷 3758-3769页

作者： Yoshiaki Shoji Kazuo Koyanagi Kohei Kanamori Kohei Tajima Mika Ogimi Kentaro Yatabe Miho Yamamoto Akihito Kazuno Kazuhito Nabeshima Kenji Nakamura Takayuki Nishi masaki Mori Department of Gastroenterological Surgery Tokai University School of MedicineIsehara 259-1193Japan

Incidence rates for esophagogastric junction cancer are rising rapidly worldwide possibly due to the economic development and demographic ***,increased attention has been paid to the prevention,diagnosis,and the treatment of esophagogastric junction *** there are discrepancies in the treatment strategy between Asian and Western countries,surgery remains the mainstay of treatment for esophagogastric junction *** developments of perioperative multidisciplinary treatment may lead to better therapeutic effect,higher complete resection rate,and better control of the residual diseases,thus result in prolonged *** this review,we will focus on the treatment of locally advanced resectable esophagogastric junction cancer,and discuss the current status and future perspectives of the perioperative treatment including chemotherapy,radiation therapy,and immunotherapy,as well as the surgical *** understanding of the latest treatment strategy and future overlook may enable to standardize and individualize the treatment for esophagogastric junction cancer,thus leading to better prognosis for those patients.

关键词： Esophagogastric junction cancer Perioperative therapy Neoadjuvant therapy Surgery Multidisciplinary treatment

Erythropoietin gene transfer into rat testes by in vivo electropo-ration may reduce the risk of germ cell loss caused by cryptorchidism

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Asian Journal of Andrology 2005年第4期7卷 369-373,页

作者： masaki Dobashi Kazumasa Goda Hiroki Maruyama Masato Fujisawa Division of Urology Department of Organs Therapeutics Faculty of Medicine Kobe University Graduate School of Medicine Kobe 650-0017 Japan Division of Nephrology and Rheumatology Niigata University Graduate School of Medical and Dental Sciences Niigata 951-8120 Japan

Aim： To investigate the effects of rat Erythropoietin （Epo） on spermatogenesis by transferring rat Epo gene into cryptorchid testes by means of in vivo electroporation. Methods： Sprague-Dawley rats with surgically-induced unilateral cryptorchidism were divided into three groups： the first group was given intratesticular injections of pCAGGS-Epo （pCAGGS-Epo group）, the second group was given intratesticular injections of pCAGGS （pCAGGS group）, and the third group were given intratesticular injections of phosphate-buffered saline （PBS group）. At the same time, square electric pulses of 30 V were applied six times with a time constant of 100 ms. One or two weeks after injection, each testis was weighed and the ratio of the total number of germ cells to that of Sertoli cells （G/S ratio） was calculated to evaluate the impairment of spermatogenesis. Ten testes taken from each of the three groups were examined at each time point. Results： The testicular weight after the injection of pCAGGS-Epo or pCAGGS control plasmid was （0.85 ± 0.08） g and （0.83 ± 0.03） g, respectively, at week 1 （P = 0.788） and （0.62 ± 0.06） g and （0.52 ± 0.02） g, respectively, at week 2 （P = 0.047）. At week 1, spermatids and sperm were more abundant in testes with pCAGGS-Epo than those in the control testes. At week 2, spermatids and sperm were hardly detected in either group. The G/S ratio was 23.27 ± 6.80 vs. 18.63 ± 5.30 at week 1 （P = 0.0078） and 7.16 ± 3.06 vs. 6.05 ± 1.58 at week 2 （P = 0.1471）, respectively. Conclusion： The transfer of Epo to rat testes by in vivo electroporation may reduce the risk of the germ cell loss caused by cryptorchidism.

关键词： electroporation gene transfer techniques erythropoietin spermatogenesis Epo

Micro-scale Additive Manufacturing Using the Optical Potential Generated by a Bessel Beam

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Nanomanufacturing and Metrology 2020年第4期3卷 292-298页

作者： masaki Michihata Makoto Yokei Shotaro Kadoya Satoru Takahashi Department of Precision Engineering The University of Tokyo7-3-1 HongoBunkyoTokyo 113-8654Japan Research Center for Advanced Science and Technology The University of Tokyo4-6-1 KomabaMeguroTokyo 153-8904Japan

In this study,we proposed a novel micro-scale additive manufacturing method based on the optical potential formed by a Bessel *** proposed technique is expected to show no deterioration in manufacturing resolution due to heat genera-tion,to be applicable to various materials,and to be able to be performed in an air *** basic principle of the proposed method involves accumulating and stacking particles dispersed in air by using optical radiation *** this paper,the trajectory of the accumulated particles was numerically estimated and experimentally *** numerical and experimental results agreed well;specfially,the back ground flow carried the particles to the optical axis of the Bessel beam,and then the particles were localized at the bottom of the optical potential valley on the ***,a pillar structure was fabricated with polystyrene particles having a diameter of 1 um,which indicated that the proposed technique was promising for practical applications.

关键词： Additive manufacturing Optical radiation pressure Optical trapping potential Bessel beam Nanoparticles

Design Study of Top Lid with Clamp Structure in JT-60SA Cryostat

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Plasma Science and Technology 2013年第2期15卷 188-191页

作者： Shigetoshi NAKAMURA Yusuke K. SHIBAMA Kei masaki Akira SAKASAI Japan Atomic Energy Agency Mukouyama 801-1 Naka Ibaraki 311-0193 Japan

JT-60SA is a fully superconducting coil tokamak upgraded from the JT-60U. This paper focused on the integrity of the top lid of cryostat in JT-60SA. The design requirement for the cryostat in normal operations is to achieve vacuum insulation of 10-1 Pa, and the top flange of the top lid is lightly welded onto its body flange. The weld is tensile-loaded by bending deformation of the top lid due to vacuum pressure of external 0.1 MPa. This weld integrity is evaluated with tensile-load reduction, which results in clamp reinforcement. The structural integrity of the top lid is validated.

关键词： clamp vacuum insulation top lid cryostat JT-60SA

Enhancing mechanical behaviors of collapsible soil using two biopolymers

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Journal of Rock Mechanics and Geotechnical Engineering 2017年第2期9卷 329-339页

作者： Mohamed Ayeldeen Abdelazim Negm Mostafa El-Sawwaf masaki Kitazume Structural Engineering Department Tanta UniversityTantaEgypt Faculty of Engineering Zagazig UniversityZagazigEgypt Civil and Environmental Engineering Department Tokyo Institute of TechnologyTokyoJapan

This study aims to investigate the possibility of using biopolymer(environmental friendly material) to enhance the mechanical behaviors of collapsible *** types of biopolymers were(xanthan gum and guar gum) used in this study due to their stable behaviors under severe conditions and their availability with reasonable *** experimental program focused on three major soil properties,*** characterizations,collapsible potential and shear *** three properties are essential in process of soil *** biopolymer concentrations were used in this study and the experimental program was performed at two curing periods(soon after mixing the soil with the biopolymer and after one week curing time).Shear parameters were measured for the treated specimens under both soaked and unsoaked conditions,while a collapsible potential test was performed under different mixing conditions(wet mix and dry mix).A numerical model was built to predict the behavior of the treated collapsible soil after and before water *** results indicated that the ability of both xanthan gum and guar gum can be used as improvement materials for collapsible soil *** collapsible potential has been reduced from 9%to 1%after mixing the soil with 2%biopolymer concentration in the wet *** one week curing,the cohesion has been increased from 8.5 kPa to105 kPa by increasing the xanthan gum concentration from zero to 2%,leading to an overall improvement in soil shear *** also proves that the guar gum is superior to the xanthan *** shear strength of soil can be increased by about 30%when using the guar gum in comparison with the xanthan gum at the same conditions;however,the collapsible potential of soil material will be reduced by about 20%.

关键词： Collapsing soil Xanthan gum Guar gum Collapsible potential Shear strength Compaction characterizations Numerical model

An Efficient Framework to Utilize Grover Search

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南京邮电大学学报（自然科学版） 2011年第2期31卷 49-58页

作者： Shigeru Yamashita masaki Nakanishi College of Information Science and Engineering Ritsumeikan University

This paper proposes an efficient framework to utilize quantum search *** the best of our knowledge,this is the first paper to show a concrete usage of quantum search in general *** our framework,we can utilize a quantum computer as a coprocessor to speed-up some parts of a program that runs on a classical *** do so,we propose several new ideas and techniques,such as a practical method to design a large quantum circuits for search problems and an efficient quantum comparator.

关键词： quantum search general programming cooperation of quantum and classical computers quantum comparator quantum circuit design

Influence of the water jet system vs cavitron ultrasonic surgical aspirator for liver resection on the remnant liver

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World Journal of Clinical Cases 2022年第20期10卷 6855-6864页

作者： Takehiko Hanaki Ayumi Tsuda Teppei Sunaguchi Keisuke Goto masaki Morimoto Yuki Murakami Kyoichi Kihara Tomoyuki Matsunaga Manabu Yamamoto Naruo Tokuyasu Teruhisa Sakamoto Toshimichi Hasegawa Yoshiyuki Fujiwara Division of Gastrointestinal and Pediatric Surgery Department of SurgeryTottori University Faculty of MedicineYonago 683-8504TottoriJapan

BACKGROUND Several methods,such as finger fracture,Pean crush,cavitron ultrasonic surgical aspirator(CUSA),and water jet(WJ),are used for hepatic parenchymal dissection in liver *** is the conventional method in *** is a relatively novel method for parenchymal *** it has several advantages,such as lower volume of blood loss and shorter operative time,the effect of the WJ system for hepatic dissection on the remnant liver has not yet been *** To investigate and compare the effect of the WJ method vs CUSA on the remnant liver cut *** This observational study compared the two types of parenchymal transection methods(WJ vs CUSA)in liver *** total,24 and 40 patients who underwent hepatectomy using the WJ method and CUSA,respectively,were included in the ***,the clinicopathological characteristics and clinical outcomes of 24 and 40 patients were ***,postoperative contrast-enhanced computed tomography(CT)scan was performed to assess the cut surface length of the remnant liver and the degenerative thickness of the areas with a reduced contrast effect in the dissected ***,the two groups were *** On CT scan,the median areas of denaturation in the liver dissection planes were 522(range:109.5-1242)mm^(2) in the CUSA group and 324(range:93.6-1529)mm^(2) in the WJ *** area did not significantly differ between the two groups;however,the denaturation thickness of the WJ group was significantly lower than that of the CUSA group[5.8(range:0.7-11.1)mm vs 3.3(range:1.7-10.4)mm,P<0.001].CONCLUSION The WJ group had significantly thinner contrast-enhanced areas in the post hepatectomy detached section than the CUSA group.

关键词： Water jet Cavitron ultrasonic surgical aspirator Energy device Hepatic parenchymal dissection Liver resection