Effect of bar magnet structure in magnetic separators on removal rate of magnetic particles in silica powder


Effect of magnetic flux density of bar magnet on removal rate of magnetic material in powder


Quantitative evaluation of both histological and mechanical recovery in injured tendons using Fourier-transform second-harmonic-generation microscopy

IEEE Journal of Selected Topics in Quantum Electronics


Residual stress measurement of {112}-oriented CrN layers in CrN/Cr multilayer films

Journal of Vacuum Science and Technology. B, Nanotechnology & Microelectronics : Materials, Processing, Measurement, & Phenomena : JVST B


Measurement of the residual stress in chromium nitride coatings deposited on an aluminum alloy substrate using arc ion plating method


Application of ultrasonic assisted soldering method to hard-to-solder material

International Journal of Modern Physics B


Enhancement in Boiling Heat Transfer for Water Using a Polished Plate Surface

The thermal characteristic of a plate evaporator for boiling water have been experimentally investigated. Stainless-steel plates with five kinds of surface roughness (a mirror-polished surface and four kinds of polished plate surface, F2, F0, F-1, and F-2 polishing) were used for the investigation. The roughness order is F-2>F-1>F0>F2>mirror. The local boiling heat transfers were measured on the evaporator surface using ten thermocouples inside the evaporator. For a comparison of the heat transfer characteristic of the evaporator, the local boiling heat transfer coefficient was measured when the polishing direction was perpendicular or parallel to the water flow at a range of pressures (0.30.4MPa) and flow rates (2060mL/min). The results indicate that the local heat transfer coefficient increased with increasing vapor quality at all surface conditions. For F0 polishing, the heat transfer coefficient on the surface with perpendicular polishing was much larger than that on the surfaces with parallel and mirror polishing. In particular, the heat transfer coefficient of the perpendicularly polished surface (F2 and F0 polishing) was increased six-fold in comparison with that of the mirror surface at a vapor quality of 0.35. However, for the F-1 and F-2 perpendicularly polishing plates, the heat transfer coefficients were smaller than those of the F0 and F2 perpendicularly polishing plates. For the F2 perpendicularly polished plate, heat transfer enhancement was confirmed, along with an increase in the number of bubbling points, on increasing the system pressure. For the polished surface, the heat transfer coefficient increased with increasing flow rate. This indicates that the bubble formation cycle was promoted by an increased flow rate.

Journal of Chemical Engineering of Japan


Observation of Tendon Healing with Second-harmonic-generation (SHG) Microscopy

第2高調波発生光(SHG)顕微鏡を用いた腱修復の観察

Tendon rupture is a traumatic injury that is difficult to recover to the condition before injury. In previous studies, histological staining and tensile testing have been widely used to evaluate histological and mechanical healing. However, since both methods are destructive and invasive, it is difficult to apply these methods to clinical diagnosis. If the degree of healing can be visualized nondestructively and noninvasively, new findings may be obtained regarding mechanisms of the tendon healing process. In this study, we used second-harmonic-generation (SHG) microscopy to evaluate the degree of healing of ruptured tendon in a rabbit model. SHG microscopy has high selectivity and high image contrast with respect to the structural maturity, density, and aggregates of collagen molecule, without the need for histological sectioning and staining. Furthermore, since SHG light intensity sensitively reflects the structural maturity of collagen molecule and its aggregates, it has the potential to be a good indicator for the degree of healing of the injured tendon. By comparing the SHG images between 4-week-healing tendons and normal tendons in the animal model, we confirmed that SHG light intensity of the healing tendon was significantly lower than that of the normal tendon, indicating that the collagen structure in the healing tendon is still immature. Furthermore, we performed image analysis based on 2D Fourier transform of the acquired SHG images, and confirmed a significant difference in collagen distribution depending on the sample. These results indicate that SHG microscopy has the unique potential as an indicator of tendon healing.

Transactions of the Japanese Society for Medical and Biological Engineering


This study aimed to evaluate the histological and mechanical features of tendon healing in a rabbit model with second-harmonic-generation (SHG) imaging and tensile testing. A total of eight male Japanese white rabbits were used for this study. The flexor digitorum tendons in their right leg were sharply transected, and then were repaired by intratendinous stitching. At four weeks post-operatively, the rabbits were killed and the flexor digitorum tendons in both right and left legs were excised and used as specimens for tendon healing (n = 8) and control (n = 8), respectively. Each specimen was examined by SHG imaging, followed by tensile testing, and the results of the two testing modalities were assessed for correlation. While the SHG light intensity of the healing tendon samples was significantly lower than that of the uninjured tendon samples, 2D Fourier transform SHG images showed a clear difference in collagen fibre structure between the uninjured and the healing samples, and among the healing samples. The mean intensity of the SHG image showed a moderate correlation (R(2) = 0.37) with Young's modulus obtained from the tensile testing. Our results indicate that SHG microscopy may be a potential indicator of tendon healing.Cite this article: E. Hase, K. Sato, D. Yonekura, T. Minamikawa, M. Takahashi, T. Yasui. Evaluation of the histological and mechanical features of tendon healing in a rabbit model with the use of second-harmonic-generation imaging and tensile testing. Bone Joint Res 2016;5:577-585. DOI: 10.1302/2046-3758.511.BJR-2016-0162.R1.


Fatigue and wear properties of Ti 6Al 4V alloy with Cr/CrN multilayer coating


Influence of surface roughness of steel plate on self-assembly behavior of silica particles


Surface modification of medium carbon steel by electron beam alloying


Field electron emission characteristics of plasma treated carbon nanotubes


Bonding mechanism of lead-free solder and glass plate by ultrasonic assisted soldering method


Influence of Self-assembly Conditions on Film Formation, Optical and Electrical Properties of Gold Nanoparticle Network Film

金ナノ粒子ネットワーク膜の形成と光学的・電気的特性に及ぼす自己集積化条件の影響

Gold nanoparticles were grown under various sodium citrate concentration and self-assembled gold nanoparticle films were formed on a glass substrate under various conditions to examine the effect of sodium citrate concentration on the particle size of gold nanoparticles and the effect of processing time and processing temperature on the optical properties and electrical resistivity of the self-assembled gold nanoparticle film. As a result, it was found that the ratio of tetrachloroauric (III) acid to sodium citrate is preferably 1:3 was appropriate to obtain fine gold nanoparticles. The self-assembled gold nanoparticle films showed a network structure formed by nano-wires for all assembled conditions. However the thickness or the assembled state of the gold nano-wires was sensitive to the processing temperature whereas the processing time hardly affected the properties of the nano-wires. In particular, higher processing temperature led to a break in the nano-wires and then the optical properties and electrical resistivity was degraded.

Journal of the Society of Materials Science, Japan


Sulfuric acid treatment of halloysite nanoclay to improve the mechanical properties of PVA/halloysite transparent composite films


Effect of Film Thickness on Electrical and Optical Properties of ZnO/Ag Dual Layer Film


Fatigue Crack Growth Behavior of Stainless Steel Coated with TiN Film

International Journal of Modern Physics: Conference Series


Evaluation of thermo oxidative degradation behavior of gasket rubber sheet deposited with SiOxNy gas barrier films


Influence of surface free energy on adhesion of CrN thin film deposited by AIP Method


Influence of Heat Treatment Condition on Photocatalytic Properties of Oxidized TiN Film


Influence of Carbon content on Fatigue Strength of Drawn Steel Tubes for Small Once through Boiler


Influence of Heat Treatment on Fatigue Strength of Drawn Steel Tubes for Small-sized Single Pass Boiler


Influence of Particle Size on Anti-Adhesion Effect of Surface Polished Steel Plate

表面研磨処理を施した鋼板の粉体付着抑制効果に及ぼす粒子径の影響

In this paper, we examined the influence of particle size on anti-adhesion effect of a surface polished steel plate. SiO2 spherical powders and stainless steel plates with seven kinds of surface roughness were used for the investigation. The adhesion tests of SiO2 powders to the polished stainless steel plates were performed using powders of nominal size 9 and 13μm. In the case of 13μm powder, the obvious adhesion and deposition of powder was not observed for all steel surface conditions. However, strong adhesion of particles and thin deposition layers were observed for 9μm powder, being independent of surface roughness of the steel plates. The size of adhered particles on the steel plate were measured by SEM observations in order to examine the adhesion mechanism of SiO2 particle to the polished stainless plate substrate. As a result, adhesion of 3-5 μm particles to the steel surface was largely independent of surface roughness. The adhesion of 3-5 μm particles can be avoided by mixing of small particles of 0.5μm powder into 9μm powder.

Transactions of The Japan Society of Mechanical Engineers, Series C

日本機械学会論文集(C編)


Enhanced field emission characteristics of boron doped diamond films grown by microwave plasma assisted chemical vapor deposition


Influence of film structure on gas barrier properties of SiOxNy films


Effect of surface roughness parameters on thermally sprayed PEEK coatings


Influence of Surface Polishing of Steel Plate on Adhesion/Heap Behaviour of Silica Powder

シリカ粉体の付着・堆積挙動に及ぼす鋼板表面研磨処理の影響

In this paper, we examined the relationship between surface roughness and particle adhesion behavior by a proposed experiment. Five kinds of SiO_2 spherical powders (powder diameter: 0.2, 0.5, 1.0, 1.5 and 2.0μm) and stainless steel plates with seven kinds of surface roughness were used for the invetigation. The effect of humidity, electrostatic force and van der Waals force on the particle-steel adhesion behavior was also examined. The experimental results showed that van der Waals force was relatively important to the adhesion behavior compared with two other effects. The adhesion ratios of SiO_2 powders to polished stainless steel plates were measured. The adhesion ratios depend on the surface roughness and the particle diameters. The adhered particles on the steel plate were observed by SEM in order to examine the adhesion mechanism of SiO_2 particle on the polished stainless plate substrate. As the result, 0.4-1.0μm particles were easy to adhere independent of surface roughness and nominal powder diameter. The result indicates that adhesion behavior of powder depends on the adhesion force of 0.4-1.0μm particles that are changed by the surface roughness of the steel plate.

日本機械学会論文集(C編)


Influence of Deposition Conditions on Fatigue Properties of Martensitic Stainless Steel with TiN Film Coated by Arc Ion Plating Method

International Journal of Modern Physics B


Evaluation of crack initiation and fatigue behavior of CrN film deposited on Ti-6Al-4V alloy


Influence of Heat Treatment Conditions on Photocatalytic Properties of Oxidized TiN Film

In this study, the photocatalytic activity of annealed TiN powders and films were examined to clarify the influence of annealing temperature and pressure on the photocatalytic properties under UV and visible light irradiation. TiN films were deposited on stainless steel and quartz substrates by DC magnetron sputtering, and annealed TiN powders were used as a reference material to confirm the effectiveness of TiN oxidation. TiN powders which were annealed at 873-1173K, showed obvious photocatalytic activity, under both UV and visible light irradiation. However, annealed TiN films on the stainless steel substrate showed low photocatalytic activity except for those annealed at 823K and 1.0kPa. This is because film annealed above 923 K consisted of a dominant rutile phase, and the film annealed at 1023K delaminated from the stainless substrate. For the quartz substrate, the dominant phase of the films annealed at 823 and 923 K was anatase, and all films remained completely on the substrate after annealing. In particular, the film which was annealed at 923K and 1.0kPa showed high photocatalytic activity both under UV and visible light irradiation. Thus, good photocatalytic activity can be obtained by annealing TiN with an appropriate temperature, pressure and substrate material.

Journal of Solid Mechanics and Materials Engineering


EFFECT OF BIAS VOLTAGE ON THE FATIGUE LIFE OF MARTENSITIC STAINLESS STEEL WITH TiN FILM COATED USING ARC ION PLATING METHOD


Influence of lon Bombardment Process on Adhesion between CrN Coatings and Aluminum Alloy


Study of Boron-doped Diamond Films by Microwave Plasma CVD Method


Influence of Deposition Bias Voltage on Fatigue Cracking Behavior of Chromium Nitride Film Deposited on Steel


Elevation of fatigue behavior of T-type welded joint in the small-sized single pass boiler

journal of Pressure Equipment and Systems


Influence of Plasma Radical Nitriding on Fatigue Properties of SCM435 Steel


Thermal Fatigue Properties of the Fin in the Boilers


Fatigue Properties of a T Type Welded Joint in a Small-sized Single Pass Boiler Header


Effect of the interface on the electrical properties of an Indium zinc oxide /SiOx multilayer


Effects of Dynamic lon Mixing Coating Condition for Fatigue Properties of Stainless Steel with TiN Film


Improvment of Oxidation Property of SUS304 by Gas barrier Coating


Influence of Ion Bombardment on Critical Load of CrN Film Deposited onto Aluminum Alloy by Arc Ion Plating Method

International Journal of Modern Physics B


Fatigue Properties of a T Type Welded Joint in a Small Sized Single Pass Boiler Header


Tribological Properties of Artificial Hip Joint Material Coated with DLC Thin Film in The Simulated Body Environment


Influence of CrN Film Surface Characteristics on Fatigue Behavor of Stainless Steel Coated with CrN Film by AIP Method

AIP法によりCrN薄膜を被覆したステンレス鋼の疲労挙動に及ぼすCrN膜表面性状の影響

In this study, the influence of droplet distribution on fatigue strength of SUS 304 with CrN film was examined. Three point bending fatigue test were carried out for two series of CrN films coated onto austenitic stainless steel SUS 304 by arc ion plating (AIP) method. The CrN films were deposited under two different coating conditions for obtaining the different droplet distribution. The fatigue strength was decreased by coating under both coating conditions. The fatigue cracks of the coating specimens initiated at stress range below the fatigue limit of uncoated specimen. The difference between the two samples appeared in the crack initiation and propagation behavior. In the case of a few droplets sample, the fatigue cracks initiated on the film surface at the very early stage but the crack growth rate was slow. In the case of the film with many droplets, the crack initiation life was long, however, the crack growth rate was higher than that of a few droplets sample. In addition, It was easy for the film with many droplets to coalesce the fatigue cracks. The fatigue behavior was caused by the difference of these crack initiation and propagation between two samples.

Transactions of The Japan Society of Mechanical Engineers, Series A

日本機械学会論文集(A編)


Wear mechanisms of steel roller bearings protected by thin, hard and low friction coatings


Cyclooxygenase-2 inhibitor delays fracture healing in rats

Cyclooxigenase-2 (COX-2) inhibitors have been reported to delay fracture healing. To investigate the major inhibitory period of COX-2 inhibitors in fracture healing, we administrated etodolac, a COX-2-specific inhibitor, to a rat fracture model by altering the period of administration from early to late. After closed fractures had been created at the middle of the femoral shafts in 12-week-old Wister rats, a standardized dose of etodolac was administrated in three ways: group I received it for 3 weeks, group II for just the first week after operation, and group III for just the third (final) week. Group IV was the vehicle control group. Bone maturation was estimated by radiographic scoring system, and mechanically by a three-point bending test. In both the radiographic and mechanical studies, groups I and II showed lower scores than group IV, indicating that even a short period of administration of a COX-2-specific inhibitor in the early phase of fracture healing creates a risk of delayed healing. blacksquare, square, filled.


Studies on Educational Effects of Teamwork-based Learning in 3D CAD Exercise Class

3次元CAD演習授業におけるチームワーク型学習の教育的効果に関する考察

徳島大学工学部機械工学科で開講する創成科目の中心となる3次元CAD演習授業において，チームワーク型学習方式を取り入れている．このチームワーク学習をさらに支援するために，我々は新たにWEBシステムの構築を行い，2004年度授業で導入し，有意義な結果を得ることができた．本稿では2004年度授業の概要と学生の作品を紹介し，授業評価アンケートの結果を踏まえてチームワーク学習の教育的効果について議論する．

Journal of Japanese Society for Engineering Education


A new approach towards team working education in 3D CAD exercise class

チームワーク教育を指向した3次元CAD教育の試み

本論文では機械工学科における設計製図教育全体の概要を紹介し，その中でのCAD演習授業の位置づけを明らかにする．そして，2002年末にカリキュラムの改定を行い，2003年度から実施を開始した授業内容の紹介と授業の結果を報告し，今回の改定により著しく高められた教育的効果について議論する．


Influence of Total Sputtering Pressure and Work Voltage on the Optical and Electric Properties of ITO Film onto Unheated Polymeric Substrate Produced by the Inclination Opposite Target Type DC Magnetron Sputtering

傾斜対向ターゲット型DCマグネトロンスパッタ法により有機基板に被覆したITO薄膜の光学的および電気的特性に及ぼすスパッタ圧およびワーク電圧の影響

マグネトロンスパッタリング法によってPET上にコーティングしたITO薄膜の電気抵抗率および光学的透明性に及ぼすスパッタガス圧とワーク電圧の影響を検討したものである．検討の結果，抵抗率に対してガス圧，ワーク電圧とも最適値があることを示した．また，ガス圧，ワーク電圧の透明性に及ぼす影響は小さいことも示した．

Journal of the Society of Materials Science, Japan


Effect of Arc Current on Wear Properties of CrN Film Deposited onto Tool Steel by Arc Ion Plating Method

AIP法で工具鋼に成膜したCrN 薄膜の摩耗特性に及ぼすアーク電流の影響

The wear properties of CrN mm has been investigated as a function of arc current which is one of the processing parameter of arc ion plating (AIP) method. CrN films were coated onto high-speed tool steel substrate under four arc currents of 50, 100, 150 and 200 A. CrN films were also examined using X-ray diffraction. The results obtained in the present study were summarized as follows. The dynamic micro hardness was hardly influenced by the arc current. For SEM observation, many droplets existed on the CrN film, which were generated by the dropping out of the macro-particle of non-evaporated Cr. The distribution of droplet depended markedly on the arc current. The wear weight was also dependent on the arc current. CrN film, which was synthesized at low arc current of 50 A markedly improved the wear resistance. For CrN film coated under the high arc current of 200 A, the wear resistance was less than that of film of 50 A. By the successive observation of wear track using optical microscope, the large adhesive matter was observed on the wear track. For opposite ball, the wear weight increased with decreasing the arc current. It was also seen from SEM observation and EDX that for the wear track, the adhesive matter was opposite ball. The area of adhesion of wear track for CrN film was less for 50 A than for 200 A. For 50 A CrN film, the decreases of adhesion contributed to increases in the wear resistance.

アークイオンプレティング法でCrN薄膜をコーティングした工具鋼の摩耗特性に及ぼすアーク放電電流の影響を検討したものである．検討の結果，高アーク電流で成膜すると，CrNの摩耗特性が悪化することを明らかにした．この摩耗挙動の相違は摩耗試験中における膜の破壊挙動の相違に起因していることをSEMによる詳細な観察から明らかにした．

日本機械学会論文集(A編)


Tribological Properties of TiAlSiN Film Coated by AIP Equipment onto SKD61 Substrate

摩擦摩耗特性に優れたTiAlNにSiを微量に入れたTiAlSiN薄膜をアークイオンプレーティング法で工具鋼上にコーティングし，その摩耗特性を調べた．その際，研磨によって表面粗さを変えた試験片を3種類用意し，表面粗さの影響についても検討を加えた．Siを加えることで摩耗特性が向上することを示し，また薄膜の表面粗さは相手材の摩耗量に強い影響を与えることを示した．

Tribological Research and Design for Engineering Systems


A Study on Fatigue Fracture Mechanism of Cr-Mo steel SCM435 in Super Long Life Range

超高サイクル領域における中強度鋼の疲労特性を調べるため，SCM435焼入焼戻材を用いて回転曲げ疲労試験を行った．また，予ひずみを与えた試験片も同時に用意し，予ひずみの影響についても検討を加えた．その結果，処女材では明確な疲労限度を示すものの高強度鋼で見られるようなFish-eye破壊は生じなかったのに対し，予ひずみ材では疲労限度が認められず，Fish-eye破壊も生じなかった．ただし，予ひずみ材では材料内部の介在物周りに疲労の痕跡が認められたことを示した．

International Journal of Modern Physics B


Fatigue Properties of Nitride Cr-Mo Steel with CrN Thin Film Deposited by AIP Method

低硬度の材料を基板材料としてコーティングすると，繰返し負荷過程で容易にき裂が生じることが明らかにされてきた．本研究ではこの問題を解決し，コーティングによる疲労強度の向上を目指し，基板材料としてクロムモリブデン鋼窒化処理材を使用し，CrN薄膜のコーティングを行った．その結果，低硬度材で見られたコーティングによる疲労強度の低下は無かったが，その強度はコーティングを施していないものと変わらないことを示した．


Cyclooxygenase-2 Inhibitor Inhibits the Fracture Healing

骨折後の治療期間に及ぼす麻酔薬の影響を調べるため，麻酔を投与したラットと投与しなかったラットの大腿骨を用い，骨折後の時間経過に伴う骨の強度，剛性の測定を行った．その結果，麻酔薬を用いることで骨の強度および剛性の回復が遅れることを示した．

Journal of Physiological Anthropology and Applied Human Science


Effect of Processing Condition on Fatigue Properties of Steel Modified with Fine Particle Bombarding

微粒子ショットピーニング処理を施した鋼の疲労特性におよぼす投射条件の影響

繰返し負荷に対して安定な残留応力層の形成機構など，WPC処理特有の効果が現れる条件およびその発生機構について検討を行ったものである．その結果，WPC処理を施した鋼の疲労強度は，残留応力，硬度，加工痕形状などが相互に作用することにより，特定の範囲の条件でWPC処理特有の強度向上効果が現れることを示した．

Journal of The Surface Finishing Society of Japan


Fatigue Properties of Steel Modified by Combination of Carburizing and WPC Process

浸炭焼入れとWPC処理を組み合わせたハイブリッド表面処理による鋼の疲労強度の改善

WPC処理材で問題となる改質層の浅さを克服するために浸炭焼入れとWPC処理による複合表面処理を施し，WPC処理によって形成される繰返し負荷に対して安定な残留応力層を有効に作用させることを試みた．複合処理材の疲労特性について検討を行った結果，複合処理により疲労き裂の進展抑制に極めて有効な圧縮残留応力層が形成され，疲労強度が著しく改善されることを示した．また切欠き材では特にその効果が顕著であることも示した．

Transactions of The Japan Society of Mechanical Engineers, Series A

日本機械学会論文集(A編)


Fatigue Fracture Behavior of High-Strength Steel in Super Long Life Range

四連式回転曲げ疲労試験機を用いて高強度鋼を用いて疲労試験を行うことにより，疲労限度以下の応力においても10∨10サイクルのような超長寿命域において疲労破壊が起こる事実を明らかにし，その破壊機構を解明した．

JSME International Journal, Series A: Solid Mechanics and Material Engineering


The Fatigue Properties of Ferrite-Pearlite Steel Modified by WPC Process

WPC処理を施したフェライト·パーライト鋼の疲労破壊特性

本研究はWPC処理による大幅な疲労強度の改善機構を明らかにすべく，まずフェライト-パーライト鋼を用い，その疲労特性におよぼす影響を硬化層，残留応力層，表面状態から検討を行った．その結果，WPC処理は従来のショットピーニング処理に比べて硬化層が極めて浅いが，表面のくぼみが小さいこと，繰返し負荷に対して安定な残留応力層を鋼表面に形成することなどにより，疲労強度が向上することを示した．

日本機械学会論文集(A編)


Fracture Mechanism of Ferritic Ductile Cast Iron in Extrmely Low Cycle Fatigue

FDI材の極低サイクル疲労域における内部き裂型破壊機構

球状黒鉛鋳鉄は数十回程度の繰返し負荷で破断に至る極低サイクル疲労域では材料内部からき裂が生じて破断する内部き裂型破壊を呈する．本論文では内部き裂の発生·進展機構を詳細な実験，観察から検討したものである．検討の結果，内部き裂型破壊は大塑性ひずみによる静的損傷と疲労損傷とが組合わさることによって生じることを示した．

日本機械学会論文集(A編)


Orientation analysis of collagen fibers in healing tendon by using second-harmonic-generation microscopy

Progress in Biomedical Optics and Imaging - Proceedings of SPIE


Stability of ZnO/Self-Assembled Gold Nanoparticle Network Film