Abstract:
The present invention provides a hybrid composite sealant, as a sealing material for a planar type solid oxide fuel cell stack, having a matrix of a glass composition, wherein a surface layer reinforced with platelet reinforcement particles is laminated on either one or both surfaces of an inner layer reinforced with fibrous reinforcement particles. Accordingly, by applying the composite sealant of the present invention to the solid oxide fuel cell stack, excellent gas-tightness of the stack can be obtained even under low coupling pressure, thermal cycling durability can be enhanced due to low coupling strength with a contact surface of an object to be sealed, stack disassembly and maintenance can be facilitated when parts within the stack are disabled, and stack stability as well as stack performance can be maintained under a pressurized operation condition where pressure differentials between the inside and outside of the stack reach to 5 atmospheric pressures (0.5 MPa).
Abstract:
The invention relates to an electromagnetic noise filter capable of regulating LC resonance frequency and applicable to coplanar transmission lines with excellent skirt characteristics. The electromagnetic noise filter includes a semiconductor substrate, and a dielectric film formed on an upper surface of the semiconductor substrate. The electromagnetic noise filter also includes a coplanar signal line formed on the dielectric film with conductive material, the coplanar signal line having a spiral pattern turned at least one time. The electromagnetic noise filter further includes first and second coplanar grounding lines formed on the dielectric film with conductive material, forming opposed peripheries of the coplanar signal line.
Abstract:
Silica or alumina based ceramic diffusers generate microbubbles for solid-liquid separation of pollutants in wastewater. Methods for manufacturing the diffusers and methods for wastewater treatment based onair-flotation using the diffusers are also disclosed. The ceramic diffuseris capable of achieving a particle size distribution in which the sizes of silica or alumina particles increase in the direction towards the center with particles on the surface being the smallest. Thus a small air pressure around 1 atm is capable of providing a uniform and steady stream of microbubbles for securing a rapid flotation of pollutants in wastewater. In addition, the ceramic diffuser can be used conveniently and semi -permanent Iy without maintenance problems, adding to its economic advantage. Furthermore, the enhanced productivity arising from the use of the extrusion molding process for producing the ceramic diffusers supports additional cost reduction.
Abstract:
Disclosed are 2,4-dioxo-quinazoline derivative compounds of Formula 1 which is a selective antagonist with respect to a T-type calcium channel and can be developed as a drug for neurogenic pains, epilepsy or hypertension, and a preparation method thereof.
Abstract:
The present invention relates to a honeycomb type SOFC wherein a first material, density of which is lowered upon phase-transition, a second material having higher thermal expansion coefficient than that of an electrode supporter, or a composite material of the first and second materials is filled in the electrode channel to which the collector is bonded as a material which can form an oxide under the electrode atmosphere, and a manufacturing method thereof.
Abstract:
The present invention relates to a biodegradable and thermosensitive poly(organophosphazene) with a functional group, a preparation method thereof, and a use thereof for delivery of bioactive substances. According to the present invention, poly(organophosphazene) is a phosphagen-based polymer showing biodegradability, thermosensitivity, and sol-gel phase transition depending on temperature change, whereby when administered into a living body with bioactive substances such as drugs, the poly(organophosphazene) forms a gel-phase at body temperature to be capable of controlled release of the bioactive substances. Further, the poly(organophosphazene) has functional groups to chemically bind with bioactive substances through an ionic bond, covalent bond, or coordinate covalent bond to be capable of a sustained release of the bioactive substances due to its good binding property. Therefore, the poly(organophosphazene) is useful as a delivery material for bioactive substances.
Abstract:
The present invention relates to a feed for controlling bee mites and a method of its preparation. In the present invention, the feed is prepared by mixing cymiazole with pollen or pollen substitute with a predetermined ratio. The feed prepared as a result is shown to have excellent activity in controlling bee mites, and also applicable to young honey bees, to which the conventional acaricides have not been applicable, thus eliminating problems raised with the conventional acaricides while capable of breeding and nurturing of young honey bees.
Abstract:
A method for fabricating an ultra-sensitive metal oxide gas sensor is disclosed, which comprises the steps of spinning a mixture solution including a metal oxide precursor and a polymer onto a sensor electrode to form a metal oxide precursor-polymer composite fiber; thermally compressing or thermally pressurizing the composite fiber; and thermally treating the thermally compressed or thermally pressurized composite fiber to remove the polymer from the composite fiber. Since the gas sensor includes a macro pore between nanofibers and a meso pore between nano-rods and/or nano-grains, gas diffusion and surface area can be maximized. Also, the ultra-sensitive sensor having high stability in view of mechanical, thermal, and electrical aspects can be obtained through rapid increase of adhesion between the metal oxide thin layer and the sensor electrode.
Abstract:
An injectable thermosensitive pluronic derivative hydrogel coupled with a biologically active material such as a ligand peptide having a cell affinity or a growth factor for tissue regeneration, and a preparation method thereof, comprising: coupling a pluronic derivative with methacryloxyethyltritrimellitic anhydride having a double bond and a functional group; and introducing a ligand peptide having a cell affinity or a growth factor to the resultant.
Abstract:
A separation plate having a gas flow path is segmented for analyzing MEA performance without segmenting an electrode or a gas diffusion layer. In advance, a MEA is operated for a long time in a real stack environment using a typical separation plate which is not segmented, and then the segmented separation plate for analyzing MEA performance is mounted to the MEA.