5259 research outputs found
Sort by
Structure of Yttrium and Phosphorus-Containing Microspheres Prepared by Spray Dry Method
Get PDFMicrospheres containing yttrium (Y) and/or phosphorus (P) around 25 µm are useful for radioembolization therapy because they are activated to β-emitter by neutron bombardment and infused in blood vessels in the neighborhood of tumors to irradiateβ-rays to the tumors. In this study, we attempt to prepare Y and P-containing microspheres by spray drying method. Starting solution containing yttrium nitrate and phosphoric acid in equimolar ratio was spray dried under various conditions. Microspheres 5-30 µm in size are obtained when the starting solution with polyvinyl alcohol (PVA) binder was spray-dried at the atomizing pressure of 0.05 MPa. When the microspheres were heated at 1100ºC for 1 h, they precipitated Y-containing crystals such as yttrium phosphate (YPO4), yttrium oxide (Y2O3), yttrium polyphosphate (Y(PO3)3) and yttrium tetraphosphate (Y2P4O13) but most of them were ruptured. Without the PVA binder, small microspheres around 5 µm in size were formed but their shape remained even after the heat treatment. We found that the atomizing pressure of spray dryer remarkably affects the size of microspheres and PVA binder is essential to obtain microspheres around 25 µm, but addition of pH adjuster to starting solution is not essential. This study proposed the criterion of conditions to prepare Y and P-containing microspheres by spray drying method
IGBT chip current imaging system by scanning local magnetic field
Get PDF24th European Symposium on Reliability of Electron Devices, Failure Physics and Analysis. Schedule, September 30-October 4, 2013, Venue, Arcachon, FranceAn IGBT / power diode current distribution imaging system was demonstrated. This system can capture current redistribution or oscillation inside or among chips on a DBC-level sub-module. It can perform failure analysis of power semiconductors by detecting problems such as nonuniform current distribution between bonding wires. The system scans the chip’s shape using a laser sensor and then records the local magnetic field near the bonding wire using a 4-axis robot coil sensor. The coil sensor has two pair of Cu patterned spiral coils symmetrically arranged on both sides of a 60-μm-thick polyimide film. The system enables the analysis of destructive current concentrations of the entire chip, among chips or a part of the chip under high current or high voltage switching conditions, without making any changes or disassembling the chip connections
Temporal Subtraction Method for Thoracic MDCT Image by Using Intensity Gradient Information
No full textRecently, CAD system has been introduced as a visual screening method in medical field. Also, temporal subtraction method, which enhances temporal changes such as the abnormalities on the image, is implemented as one of technique for CAD by subtracting previous image from current one. Image registration techniques are required for the temporal subtraction method. If the accuracy of image registration is insufficiently, normal structure elements which should be removed are remained on subtraction image. In this study, a novel image registration method for temporal subtraction technique on thoracic MDCT images has been developed to reduce the subtraction artifacts by using intensity gradient information. The proposed method has been applied to thoracic MDCT images, and its efficiency has been indicated
Improvement of Visible Light Responsivity of Rutile TiO_2 Nanorods by Site-Selective Modification of Iron (III) Ion on Newly Exposed Faces Formed by Chemical Etching Treatment.
No full text九州工業大学博士学位論文 学位記番号:工博甲第348号 学位授与年月日:平成25年3月25日1. 緒言||2. 光触媒酸化チタンの反応効率の向上||3. ルチル型酸化チタンナノロッドの表面構造制御||4. 光触媒酸化チタンの可視光応答化||5. 光触媒酸化チタンナノロッドの可視光応答性の向上||6. 結
健康関連の多次元情報を用いた産業保健マーケティング的研究－対象集団選択におけるSOM の有効性の検討を中心に－
No full text九州工業大学博士学位論文（要旨） 学位記番号:生工博甲第207号 学位授与年月日:平成25年6月30
新しい資源循環型バイオベースポリエステル：ポリテトラメチルグリコリドに関する研究
No full text九州工業大学博士学位論文（要旨） 学位記番号:生工博甲第199号 学位授与年月日:平成25年3月25
Study of Parallel Streaming XML Processing on Networking Nodes which Relay Communications at Intermediate Networks
No full text九州工業大学博士学位論文（要旨） 学位記番号:情工博甲第284号 学位授与年月日:平成25年12月26