Masaaki Nakai
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View article: Effect of Cold Rolling and Annealing on Grain Refinement of β-Type Ti-13Nb-1.5Ta-3Mo Titanium Alloy
Effect of Cold Rolling and Annealing on Grain Refinement of β-Type Ti-13Nb-1.5Ta-3Mo Titanium Alloy Open
The Ti-13Nb-1.5Mo-3Ta alloy is a recently developed biocompatible metastable β-Ti alloy designed for biomedical application. In this present work, the influence of cold rolling and subsequent annealing heat treatment on grain refinement of…
View article: Effects of Dimple Surface Texturing on Wear Characteristics of Commercially Pure Ti in Comparison with Ti-6Al-4V ELI and Ti-29Nb-13Ta-4.6Zr Alloys for Dental Applications
Effects of Dimple Surface Texturing on Wear Characteristics of Commercially Pure Ti in Comparison with Ti-6Al-4V ELI and Ti-29Nb-13Ta-4.6Zr Alloys for Dental Applications Open
View article: Gas and Steam Permeation Properties of Cation-Exchanged ZSM-5 Membrane
Gas and Steam Permeation Properties of Cation-Exchanged ZSM-5 Membrane Open
NaZSM-5 powder and membranes were hydrothermally prepared. Their (1) steam (H2O) adsorption properties and (2) the permeation and separation of gas and H2O were evaluated before and after the cation exchange of Na+ to K+ or Cs+. The quanti…
View article: Independent verification system for intracavitary brachytherapy based on a reference plan and statistical model
Independent verification system for intracavitary brachytherapy based on a reference plan and statistical model Open
High dose rate (HDR) intracavitary brachytherapy (ICBT) with a remote afterloading system plays a vital role in the treatment of cervical cancer. We aimed to develop a new verification system for ICBT for cervical cancer and evaluate the f…
View article: Microstructure and Mechanical Properties of α+β (near β) Ti-17 Alloy Linear Friction-welded Joints
Microstructure and Mechanical Properties of α+β (near β) Ti-17 Alloy Linear Friction-welded Joints Open
View article: Concept and Fabrication of Beta-Type Titanium Alloy Rod with Parts Possessing Different Young’s Moduli for Spinal Fixation
Concept and Fabrication of Beta-Type Titanium Alloy Rod with Parts Possessing Different Young’s Moduli for Spinal Fixation Open
View article: Association between a combination of cognitively stimulating leisure activities and long-chain polyunsaturated fatty acid intake on cognitive decline among community-dwelling older Japanese individuals
Association between a combination of cognitively stimulating leisure activities and long-chain polyunsaturated fatty acid intake on cognitive decline among community-dwelling older Japanese individuals Open
Multifactorial lifestyle approaches could be more effective than a single factor for maintaining cognitive function. This study investigated the association of combining cognitively stimulating leisure activities (CSLAs), including puzzles…
View article: Assessment of spinal alignment in standing position using Biplanar X-ray images and three-dimensional vertebral models
Assessment of spinal alignment in standing position using Biplanar X-ray images and three-dimensional vertebral models Open
We developed two methods for three-dimensional (3D) evaluation of spinal alignment in standing position by image matching between biplanar x-ray images and 3D vertebral models. One used a Slot-Scanning 3D x-ray Imager (sterEOS) to obtain b…
View article: Effects of Fe Addition on the Mechanical and Corrosive Properties of Biomedical Co-Cr-W-Ni Alloys for Balloon-Expandable Stents
Effects of Fe Addition on the Mechanical and Corrosive Properties of Biomedical Co-Cr-W-Ni Alloys for Balloon-Expandable Stents Open
View article: Gas and Steam Permeation Properties of Cation Exchanged Zsm-5 Membrane
Gas and Steam Permeation Properties of Cation Exchanged Zsm-5 Membrane Open
View article: Effects of Combining Docosahexaenoic Acid and Eicosapentaenoic Acid with Sesame Lignan on Vascular Endothelial Function
Effects of Combining Docosahexaenoic Acid and Eicosapentaenoic Acid with Sesame Lignan on Vascular Endothelial Function Open
Vascular endothelial cells produce vasoactive substances, such as nitric oxide (NO), to regulate vascular relaxation and contraction. Docosahexaenoic acid (DHA) and eicosapentaenoic acid (EPA) enhance NO production in endothelial cells, an…
View article: Effects of Long-Chain Polyunsaturated Fatty Acids in Combination with Lutein and Zeaxanthin on Episodic Memory in Healthy Older Adults
Effects of Long-Chain Polyunsaturated Fatty Acids in Combination with Lutein and Zeaxanthin on Episodic Memory in Healthy Older Adults Open
Arachidonic acid (ARA), docosahexaenoic acid (DHA), and eicosapentaenoic acid (EPA), which are long-chain polyunsaturated fatty acids (LCPUFAs), as well as lutein (L) and zeaxanthin (Z), can potentially improve brain function. However, the…
View article: Comparison of The Efficacy and Safety of Topical 2% Minoxidil and 5% Minoxidil Solution in Fingernail Growth Rate
Comparison of The Efficacy and Safety of Topical 2% Minoxidil and 5% Minoxidil Solution in Fingernail Growth Rate Open
View article: Investigation of the Influence of High-Pressure Torsion and Solution Treatment on Corrosion and Tribocorrosion Behavior of CoCrMo Alloys for Biomedical Applications
Investigation of the Influence of High-Pressure Torsion and Solution Treatment on Corrosion and Tribocorrosion Behavior of CoCrMo Alloys for Biomedical Applications Open
In this study, the influence of the high-pressure torsion (HPT) processing parameters and solution treatment (ST) on the corrosion and tribocorrosion behavior of CoCrMo (CCM) alloys was investigated for possible usage in biomedical applica…
View article: Sesamin Metabolites Suppress the Induction of Cellular Senescence
Sesamin Metabolites Suppress the Induction of Cellular Senescence Open
Cellular senescence induces inflammation and is now considered one of the causes of organismal aging. Accumulating evidence indicates that age-related deterioration of mitochondrial function leads to an increase in reactive oxygen species …
View article: Microstructure and mechanical properties of the Co-Cr-W-Ni alloy tubes for balloon-expandable stents
Microstructure and mechanical properties of the Co-Cr-W-Ni alloy tubes for balloon-expandable stents Open
View article: Concept and Fabrication of Beta-Type Titanium Alloy Rod with Parts Possessing Different Young’s Moduli for Spinal Fixation
Concept and Fabrication of Beta-Type Titanium Alloy Rod with Parts Possessing Different Young’s Moduli for Spinal Fixation Open
This paper proposes the concept and fabrication process of titanium alloy rods for spinal fixation. A part of rod for fixing the lower side of the lumbar vertebra is strengthened, while the other part for fixing the upper side has low stif…
View article: Effects of Quercetin Glycoside Supplementation Combined With Low-Intensity Resistance Training on Muscle Quantity and Stiffness: A Randomized, Controlled Trial
Effects of Quercetin Glycoside Supplementation Combined With Low-Intensity Resistance Training on Muscle Quantity and Stiffness: A Randomized, Controlled Trial Open
Objective Aging of skeletal muscle is characterized not only by a decrease of muscle quantity but also by changes in muscle quality, such as an increase in muscle stiffness. The present study aimed to investigate the effects of supplementa…
View article: The association between long-chain polyunsaturated fatty acid intake and changes in brain volumes among older community-dwelling Japanese people
The association between long-chain polyunsaturated fatty acid intake and changes in brain volumes among older community-dwelling Japanese people Open
The relationship between age-related brain atrophy and long-chain polyunsaturated fatty acid (LCPUFA) intake is not fully understood. This study investigated the association of docosahexaenoic acid (DHA), eicosapentaenoic acid (EPA), and a…
View article: Microstructure and mechanical properties of Ti–Nb–Fe–Zr alloys with high strength and low elastic modulus
Microstructure and mechanical properties of Ti–Nb–Fe–Zr alloys with high strength and low elastic modulus Open
Zr was added to Ti–Nb–Fe alloys to develop low elastic modulus and high strength β-Ti alloys for biomedical applications. Ingots of Ti–12Nb–2Fe–(2, 4, 6, 8, 10)Zr (at.%) were prepared by arc melting and then subjected to homogenization, co…
View article: Effects of Al addition and heat treatment on microstructure and damping capacity of flake graphite cast iron
Effects of Al addition and heat treatment on microstructure and damping capacity of flake graphite cast iron Open
Flake graphite cast iron has high damping capacity. Among the various theories on the damping mechanism of cast iron, the viscoelastic layer between matrix and graphite is an important factor. This indicates that the increase in surface ar…
View article: Effect of titanium plate stiffness on bone healing in rabbit femur
Effect of titanium plate stiffness on bone healing in rabbit femur Open
Titanium and its alloys are widely used as orthopedic devices for fixation of bone fractures. A combination of low elastic modulus and suitable implant plate thickness, to adjust the stiffness of the implant plate, can improve the healing …
View article: Development of Low-Yield Stress Co–Cr–W–Ni Alloy by Adding 6 Mass Pct Mn for Balloon-Expandable Stents
Development of Low-Yield Stress Co–Cr–W–Ni Alloy by Adding 6 Mass Pct Mn for Balloon-Expandable Stents Open
This is the first report presenting the development of a Co–Cr–W–Ni–Mn alloy by adding 6 mass pct Mn to ASTM F90 Co–20Cr–15W–10Ni (CCWN, mass pct) alloy for use as balloon-expandable stents with an excellent balance of mechanical propertie…
View article: Antibacterial Cu-Doped Calcium Phosphate Coating on Pure Titanium
Antibacterial Cu-Doped Calcium Phosphate Coating on Pure Titanium Open
Cu-doped amorphous calcium phosphate (ACP) coatings were fabricated on the surface of pure titanium (Ti) by electrochemical deposition at initial electrolyte temperatures of 35, 45, and 55°C. The antibacterial activities of the coatings we…
View article: Improvement of Mechanical Properties by Microstructural Evolution of Biomedical Co–Cr–W–Ni Alloys with the Addition of Mn and Si
Improvement of Mechanical Properties by Microstructural Evolution of Biomedical Co–Cr–W–Ni Alloys with the Addition of Mn and Si Open
We investigated changes in the microstructure and mechanical properties of biomedical Co-20Cr-15W-10Ni alloys (mass%) containing 8 mass% Mn and 0-3 mass% Si due to hot forging, solution treatment, cold swaging, and static recrystallization…
View article: Mechanical properties of biomedical 316L stainless steel plates with in-plane orthogonal anisotropy by aligning crystallographical orientation via additive manufacturing
Mechanical properties of biomedical 316L stainless steel plates with in-plane orthogonal anisotropy by aligning crystallographical orientation via additive manufacturing Open
Low stiffness in the axial direction is required to suppress stress shielding, whereas high stiffness in the torsional direction is required to promote bone healing in metallic implants. Therefore, two types of 316L stainless steel additiv…
View article: Factors Leading to Low Elastic Modulus and Current Status of Medically Applied Research of β-type Ti-Nb-based Alloys
Factors Leading to Low Elastic Modulus and Current Status of Medically Applied Research of β-type Ti-Nb-based Alloys Open
View article: Relationship between Microstructure and Fatigue Properties of Forged Ti–5Al–2Sn–2Zr–4Mo–4Cr for Aircraft Applications
Relationship between Microstructure and Fatigue Properties of Forged Ti–5Al–2Sn–2Zr–4Mo–4Cr for Aircraft Applications Open
Titanium alloys have applications in air frames for commercial aircraft, and jet engine components such as fans and compressor disks, which function at low temperatures (up to 673 K). Near β-type Ti–5Al–2Sn–2Zr–4C–4Mo (Ti-17) exhibits grea…
View article: Relationship between Microstructure and Fatigue Properties of Forged Ti-5Al-2Sn-2Zr-4Mo-4Cr for Aircraft Applications
Relationship between Microstructure and Fatigue Properties of Forged Ti-5Al-2Sn-2Zr-4Mo-4Cr for Aircraft Applications Open
Titanium alloys have been used not only in air frames for commercial aircrafts, but also in its jet engine components such as fans and compressor disks, which have a function at relatively low temperatures up to 673 K. Near β-type Ti-5Al-2…
View article: Effect of titanium plate fixation on bone healing
Effect of titanium plate fixation on bone healing Open
Bone formation which is a process before bone remodeling in fracture healing process, was investigated in this study by fixing metallic plate after an artificially created defect in a rabbit femur. Although a complete bone remodeling takes…