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Multi-step Metamagnetic Processes of PrPd2Si2 Single Crystal
Toru Shigeoka,Tetsuya Fujiwara,Keiichi Koyama,Shojiro Kimura,Kazuo Watanabe 한국물리학회 2013 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.63 No.3
Magnetic studies were performed on PrPd2Si2 single crystals which crystallize in the tetragonalThCr2Si2-type structure. The temperature dependence of the magnetic susceptibility indicates thatthe compound orders antiferromagnetically at temperatures below TN = 3.2 K. The transition wasconfirmed by specific heat measurements. Magnetization measurements at fields up to 18 T showthat the easy magnetization direction is the [100] direction in the basal plane. In the magnetizationprocess, five or four metamagnetic transitions appear; the process is a five (four)-step metamagneticone. The [110] magnetization process is a three-step one. A strong magnetic anisotropy betweenthe [100] and [110] directions is observed within the basal plane for high magnetic fields. Alongthe hard magnetization direction of the c-axis, a metamagnetic transition appears. The B[100] − Tphase diagram was constructed. A magnetic anisotropy between the [100] and [001] directions isalso strong. These behaviors are discussed based on an analysis of crystalline field effects.
DEBRIS DISKS AND THE ZODIACAL LIGHT EXPLORED BY THE AKARI MID-INFRARED ALL-SKY SURVEY
DAISUKE ISHIHARA,NAMI TAKEUCHI,TORU KONDO,HIROSHI KOBAYASHI,HIDEHIRO KANEDA,SHU-ICHIRO INUTSUKA,SHINKI OYABU,TAKAHIRO NAGAYAMA,HIDEAKI FUJIWARA,TAKASHI ONAKA 한국천문학회 2017 天文學論叢 Vol.32 No.1
Debris disks are circumstellar dust disks around main-sequence stars. They are important observational clues to understanding the planetary system formation. The zodiacal light is the thermal emission from the dust disk in our Solar system. %For a comprehensive understanding of the nature andthe evolution of dust disks around main-sequence stars,we try a comparative study of debris disks and the zodiacal light. %We search for debris disks using the AKARI mid-infrared all-sky point source catalog. By applying accurate flux estimate of the photospheric emissionbased on the follow-up near-infrared observations with IRSF,we have improved the detection rate of debris disks. %For a detailed study of the structure and grain propertiesin the zodiacal dust cloud,as an example of dust disks around main-sequence stars,we analyze the AKARI mid-infrared all-sky diffuse maps. %As a result of the debris disks search,we found old ($>$1\,Gyr) debris disks which have large excess emissioncompared to their age, which cannot be explained simplyby the conventional steady-state evolution model. %From the zodiacal light analysis, we find the possibilitythat the dust grains trapped in the Earth's resonance orbitshave increased by a factor of $\sim$3 in the past $\sim$20 years. %Combining these results, we discuss the non-steady processes in debris disks and the zodiacal light.
Calcar Femorale in Patients with Osteoarthritis of the Hip Secondary to Developmental Dysplasia
Tomonori Tetsunaga,Kazuo Fujiwara,Hirosuke Endo,Tomoko Tetsunaga,Naofumi Shiota,Toru Sato,Toshifumi Ozaki 대한정형외과학회 2017 Clinics in Orthopedic Surgery Vol.9 No.4
Background: We investigated whether the calcar femorale, a cortical septum in the region of the lesser trochanter of the femur, correlates with results of femoral stem implantation in patients with osteoarthritis of the hip secondary to developmental dysplasia using computed tomography. Methods: This retrospective study included 277 hips (41 males and 236 females; age, 37 to 92 years) of patients who had presented to Okayama Medical Center with hip pain. Of these, a total of 219 hips (31 males and 188 females) had previously undergone total hip arthroplasty. According to the Crowe classification, 147 hips were classified as Crowe grade I, 72 hips as Crowe grade II– IV, and 58 hips as normal. Results: The calcar femorale was identified in 267 hips (96.4%). The calcar femorale was significantly shorter and more anteverted in Crowe grade II–IV hips than in Crowe grade I or normal hips. Significant differences in the shape of the calcar femorale were found according to the severity of hip deformity. Three stem designs were analyzed: single-wedge (59 hips), double-wedge metaphyseal filling (147 hips), and modular (13 hips). Single-wedge stems were inserted more parallel to the calcar femorale rather than femoral neck anteversion, while other types of stems scraped the calcar femorale. Conclusions: The angle of the calcar femorale differs according to the severity of hip deformity, and the calcar femorale might thus serve as a more useful reference for stem insertion than femoral neck anteversion in total hip arthroplasty using a singlewedge stem.
Successive Magnetic Transitions of PrRh2 Single Crystals
Yu Okawara,Jingwei Cui,Tetsuya Fujiwara,Toru Shigeoka,Kazuyuki Matsubayashi,Yoshiya Uwatoko,Shojiro Kimura,Kazuo Watanabe 한국물리학회 2013 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.63 No.3
Measurements of the magnetization and the specific heat were performed on a PrRh2 single crystal. A strong magnetic anisotropy with the easy magnetization direction of the c-axis is observed. Four anomalies appear in the temperature dependence of magnetic susceptibility along the c-axis;a cusp at TN=52 K, a high peak at T3=38 K, a shoulder at T2=33 K and a small peak at T1=4K are observed, indicating magnetic transitions. The specific heat also shows four anomalies atthe temperatures where the magnetic anomalies appear, confirming the occurrence of successivemagnetic transitions. A clear two-step metamagnetic process appears along the easy magnetizationdirection of the c-axis at low temperatures. The magnetization in the first step is almost constantand is corresponds to (1/5) Ms (Ms: saturation magnetization), indicating that this field-inducedphase has a long period and a stable magnetic structure. A metamagnetic process is hypothesizedon the basis of the magnetic structure. The B001 − T phase diagram is constructed.
Norifumi Fujii,Manabu Tsukamoto,Nobukazu Okimoto,Miyuki Mori,Yoshiaki Ikejiri,Toru Yoshioka,Makoto Kawasaki,Nobuhiro Kito,Junya Ozawa,Ryoichi Nakamura,Shogo Takano,Saeko Fujiwara 대한골다공증학회 2021 Osteoporosis and Sarcopenia Vol.7 No.2
Objectives: The relationship between weight-related load and bone mineral density (BMD)/bone microstructure under normal load conditions using high-resolution peripheral quantitative computed tomography (HR-pQCT) remains unconfirmed. The study aims to investigate the differences in effect of body mass index (BMI) on BMD/bone microstructure of loaded and unloaded bones, respectively, in Japanese postmenopausal women. Methods: Fifty-seven postmenopausal women underwent HR-pQCT on the tibia and radius. Correlation analysis, principal component (PC) analysis, and hierarchical multiple regression were performed to examine the relationship between BMI and HR-pQCT parameters. Results: Several microstructural parameters of the tibia and radius correlated with BMI through a simple correlation analysis, and these relationships remained unchanged even with an age-adjusted partial correlation analysis. PC analysis was conducted using seven bone microstructure parameters. The first PC (PC1) reflected all parameters of trabecular and cortical bone microstructures, except for cortical porosity, whereas the second PC (PC2) reflected only cortical bone microstructure. Hierarchical multiple regression analysis indicated that BMI was more strongly related to BMD/bone microstructure in the tibia than in the radius. Furthermore, BMI was associated with trabecular/cortical BMD, and PC1 (not PC2) of the tibia and radius. Thus, BMI was strongly related to the trabecular bone microstructure rather than the cortical bone microstructure. Conclusions: Our data confirmed that BMI is associated with volumetric BMD and trabecular bone microstructure parameters in the tibia and radius. However, although BMI may be more related to HRpQCT parameters in the tibia than in the radius, the magnitude of association is modest.
Takashi Motohashi,Akira Yabuno,Hiroshi Michimae,Tetsuro Ohishi,Miwa Nonaka,Masashi Takano,Shin Nishio,Hiroyuki Fujiwara,Keiichi Fujiwara,Eiji Kondo,Toru Sugiyama,Tsutomu Tabata 대한부인종양학회 2021 Journal of Gynecologic Oncology Vol.32 No.1
Objective: The standard dose for pegylated liposomal doxorubicin (PLD) is 50 mg/m2every 4weeks. While 40 mg/m2has recently been used in clinical practice, evidence supporting thisuse remains lacking. Methods: This phase III randomized, non-inferiority study compared progression free survival (PFS) for patients with platinum-resistant ovarian carcinoma between anexperimental arm (40 mg/m2PLD) and a standard arm (50 mg/m2PLD) until 10 courses,disease progression or unacceptable toxicity. Eligible patients had received ≤2 prior lines. Stratification was by performance status and PFS of prior chemotherapy (<3 months versus ≥3months). The primary endpoint was PFS and secondary endpoints were overall survival (OS),toxicity profile, clinical response and tolerability. The total number of patients was 470. Results: The trial was prematurely closed due to slow recruitment, with 272 patients randomizedto the experimental arm (n=137) and standard arm (n=135). Final analysis was performed with234 deaths and 269 events for PFS. In the experimental arm vs. standard arm, median PFS was4.0 months vs. 4.0 months (hazard ratio [HR]=1.065; 95% confidence interval [CI]=0.830–1.366)and median OS was 14.0 months vs. 14.0 months (HR=1.078; 95% CI=0.831–1.397). Hematologictoxicity and oral cavity mucositis (≥grade 2) were more frequent in the standard arm than in theexperimental arm, but no difference was seen in ≥grade 2 hand-foot skin reaction. Conclusion: Non-inferiority of 2 PLD dosing schedule was not confirmed because the trialwas closed prematurely. However, recommendation of dose reduction of PLD should bebased both on efficacy and safety. Trial Registration: UMIN Clinical Trials Registry Identifier: UMIN000003130