Agency of Industrial Science and Technology

National Institute of Advanced Industrial Science and Technology

Ministry of International Trade & Industry

Agency of Industrial Science and Technology Ministry of International

Ngk Spark Plug Company, Limited

Japan As Represented by Director General Agency of Industrial Science

Yoshiyuki Yokogawa

Yukari Kawamoto

Takahiro Suzuki

Motohiro Toriyama

Tetsuya Kameyama

Fukue Nagata

Kaori Nishizawa

Sukezo Kawamura

Atsushi Hozumi

Masahiko Inagaki

Hajime Nagae

Koji Hyodo

Hiroshi Sumi

Chao-Nan Xu

Takashi Yamane

Motoyuki Akamatsu

Kohji Okada

Michael Roger Mucalo

Kei Teraoka

Provided are a stress analysis method and stress analysis equipment that enable a detailed stress measurement, by using both a photoelasticity measurement method and a stress measurement (mechanoluminescence measurement) which utilizes a mechanoluminescent substance to measure a stress state of an object. Physical quantities that are measurable include individual principal stress component and a principal stress direction. The photoelasticity measurement method alone cannot measure individual principal stress component values.

Stress and strain analysis method and its equipment

This invention provides mesostructured oxide ceramics and a synthesizing method thereof, the synthesizing method employs a water-based solvent containing a metallic salt or metal complex as the ceramics precursor, template formed from an organic compound or the association thereof, and a precipitant, wherein mesostructured oxide ceramics are obtained from self-assembled oxide ceramics and organic substance by directly extracting oxide ceramics at a low temperature of 200&#xb0; C. or less by utilizing a homogenous precipitation reaction from said ceramics precursor under the coexistence of a nanometer-sized template in the solvent, and separating and collecting the obtained precipitation, and mesostructured oxide ceramics is prepared by employing the synthesizing method described above.

Mesostructured oxide ceramics and their synthesis method

A method of manufacturing hollow ceramics fibers with the pores of the micron-scale hollow structure unidirectionally oriented, the method of manufacturing is characterized in the steps of dispersing organic fibers in a dielectric liquid and applying high voltage to the dielectric liquid containing the dispersed organic fibers to electrostatically align them to produce a fiber accumulation in which the organic fibers are unidirectionally oriented, using the fiber accumulation as a mold and dipping the fiber accumulation in a ceramics base solution, and then removing the mold by treatment with heat or organic solvents.

Fabrication of hollow ceramics fibers using unidirectionally oriented organic fibers prearranged based on electrostatic means

The invention provides an artificial tooth root having acid resistance and anti-adherence of sordes and various germs, consisting of a substrate and a coating of calcium phosphate based ceramic having bioaffinity formed on the surface of this substrate, the substrate is composed of a polymer, ceramic, metal, or other material, the surface of the ceramic coating on the substrate surface is endowed with a protrusion-and-recession configuration, and is, chemically modified, and to a method for producing the artificial tooth root, by forming a coating of calcium phosphate based ceramic having bioaffinity over a substrate while imparting protrusions and recessions thereto, masking an area of the ceramic coating surface of which bioaffinity is required, and fixing a silane coupling agent exclusively over a predetermined area of the ceramic coating surface.

Artificial tooth root with anti-adherence of sordes and various germs, with acid resistance and its preparation method

The present invention provides a method for producing a calcium phosphate coating film on the surface of a substrate, even a substrate which has poor heat resistance. The method comprises the steps of soaking a substrate in a first solution containing phosphate ions, inter alia, aqueous solutions of a basic phosphate salt such as Na.sub.3 PO.sub.4 or Na.sub.2 HPO.sub.4 ; removing the substrate and drying it; and soaking the substrate in a second solution (aqueous solution) containing calcium ions, to thereby obtain a coating film comprising hydroxyapatite or a mixture containing hydroxyapatite and a hydroxyapatite precursor. The substrate removed from the second solution may be soaked in a third solution (aqueous solution) containing an apatite component at a substantially saturated or supersaturated concentration, to thereby form a hydroxyapatite coating film. There may be used substrates formed of metals, ceramics, organic polymer materials, etc. The method is applicable to a substrate having poor heat resistance, such as synthetic resin fabric, due to omission of high-temperature treatment.

Method for producing calcium phosphate coating film

A method for the production of a composite consisting of cellulose fibers coated with a calcium phosphate compound consists essentially of phosphorylating the surface of cellulose fibers, immersing the surface-phosphorylated cellulose fibers in an aqueous solution containing calcium ions and hydroxyl ions, removing the cellulose fibers from the aqueous solution and subsequently immersing them in an aqueous solution containing calcium ions and phosphoric acid ions, and then removing the cellulose fibers from the aqueous solution. Also disclosed is a composite produced by the method.

Calcium phosphate compound-cellulose fiber composite material and method

A platelike hydroxyapatite is produced by preparing from a phosphate and a calcium salt an aqueous slurry of amorphous calcium phosphate having an atomic ratio of calcium atoms to phosphorus atoms in the range of 1.3:1 to 2.0:1, adding to the aqueous slurry not less than 10% by weight of alcohol based on the amount of the aqueous slurry, and subjecting the resultant mixture to a hydrothermal treatment.

Method for production of platelike hydroxyapatite

A fibrinolytic enzyme such as urokinase, tissue plasminogen activator or streptokinase is covalently bounded to a bioadaptable porous crystalline glass to produce a thrombolytic material. Production of the glass involves combining 40-50 mol% calcium oxide, 20-30 mol% titanium dioxide and 25-35 mol% diphosphorous pentoxide to form a mixture, and combining the mixture with 0.5-4.0 mol% disodium oxide. A bioreactor for converting plasminogen in blood into plasmin can be prepared by packing the material in a column. When finely comminuted, the material can be administered into the blood of a patient for removing blood clots.

Bioadaptable porous crystalline glass containing an immobilized

A powder for coating the surface of a titanium metal is obtained by mixing compounds as raw materials for CaO, TiO.sub.2, and P.sub.2 O.sub.5 with a small amount of a Na.sub.2 O-containing compound, fusing the resultant mixture, and solidifying and pulverizing the fused mixture. A coating of a calcium phosphate compound adhering with great fastness to the surface of the titanium metal is formed by preparing an aqueous slurry containing the powder mentioned above, applying the aqueous slurry to the surface of the titanium metal, and heat-treating the coated titanium metal.

Titanium metal-coating material, method for production thereof, method

A dense coating of a calcium phosphate compound is formed on the surface of a bioadaptable ceramic substrate by applying to the ceramic calcium metaphosphate alone or a mixture of calcium metaphosphate with calcium pyrophosphate, heat-treating the applied layer thereby fusing the applied layer to the surface of the ceramic, then applying to the fused layer a slurry resulting from the mixture of calcium metaphosphate with tetracalcium phosphate, and subsequently heat-treating the applied layer of the slurry thereby inducing reaction of the slurry.

Growing community of inventors

Komaki, Japan

Yoshiyuki Yokogawa