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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.
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.
Superconducting MgB2 Films as Radiation Detectors
Takekazu Ishida,Daisuke Fujiwara,Hisashi Shimakage,Kazuo Satoh,Masahiko Machida,Masaru Kato,Masatoshi Nishikawa,Shigehito Miki,Tsutomu Yotsuya,Zhen Wang 한국물리학회 2006 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.48 No.5I
The thermal response of a membrane-structured MgB2 film can be used to detect various sorts of radiations. High-quality MgB2 films were prepared by a sputtering technique. The MgB2 radiation detector consisted of an MgB2 thin-film meander line on a 0.5-μm-thick SiN membrane. The detector devices were placed in a 4 K refrigerator, and the operating temperature was controlled at a certain temperature below Tc. Light from a 20-ps pulsed laser directly irradiated the MgB2 device; the end of the optical fiber was fixed in front of the device. An erbium-doped fiber amplifier (EDFA) and a GP-IB attenuator were used to control the laser power, and the output voltage was observed through a low-noise amplifier by using a digital oscilloscope. The output signals caused by thermal response were clearly observed. Systematic studies of the output signals were conducted, and effects of device design, dc bias conditions, bias temperature, and input laser power were considered. We report the out-of-equilibrium thermodynamics, which was investigated by means of extensive computer simulations based on the time-dependent Ginzburg-Landau equations, thermodynamics, and electrodynamics. Large-scale calculations were carried out under the realistic conditions of actual devices by using an Earth Simulator (ES). One attractive application is to use the device as a novel neutron detector by employing the 10B(n,)7Li nuclear reaction with a local energy release of 2.3 MeV.
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.