Abstract: A nozzle and an electrostatic field induction ink-jet nozzle are disclosed. In accordance with an embodiment of the present invention, the nozzle includes a concave part, which is formed along an outer circumference of the nozzle and in which the outer circumference is adjacent to a liquid discharging surface. The discharging nozzle can minimize the overflow and damping by a liquid during a process of discharging the liquid and thus maintain the discharging performance constant despite an extended operation of the nozzle.

Abstract: The present invention relates to a cell culture container, which enhances the efficiency of proliferation and differentiation of various cells including stem cells. The cell culture container according to an exemplary embodiment of the present invention includes a cell culture surface for adhering adult stem cells thereon to proliferate and differentiate the adult stem cells, and the cell culture surface includes a protrusion having a lotus leaf surface reproduction structure, which is disposed on the cell culture surface.

Abstract: A balancing assembly of an engine may include a crankshaft in which crank pins each connected to a connecting rod, are disposed at both ends thereof, and that is equipped with a counterweight opposite to and corresponding to each crank pin, a balance shaft that is disposed at a distance from the crankshaft and that rotates by the crankshaft, and a balance weight that is eccentrically formed with a balance shaft and that absorbs vibration.

Abstract: A nozzle and an electrostatic field induction ink-jet nozzle are disclosed. In accordance with an embodiment of the present invention, the nozzle includes a concave part, which is formed along an outer circumference of the nozzle and in which the outer circumference is adjacent to a liquid discharging surface. The discharging nozzle can minimize the overflow and damping by a liquid during a process of discharging the liquid and thus maintain the discharging performance constant despite an extended operation of the nozzle.

Abstract: The present invention provides a process for isolating vascular endothelial cells from embryoid bodies differentiated from embryonic stem cells, which comprises: (a) treating embryoid bodies differentiated from embryonic stem cells with 0.005-0.015% trypsin and 0.05-0.15 mM ethylenediaminetetraacetate (EDTA) to obtain vascular endothelial cell clusters; and (b) treating the vascular endothelial cell clusters with 0.1-0.5% trypsin and 0.5-2 mM EDTA so as to separate the vascular endothelial cell clusters into single cells.

Abstract: The present invention provides a process for differentiation of vascular endothelial progenitor cells from embryoid bodies derived from embryonic stem cells, the process comprising: (a) treating a culture medium comprising embryoid bodies derived from embryonic stem cells such that the concentration of oxygen dissolved in the culture medium is in the range of about 1 ppm to about 5 ppm; (b) culturing the culture medium prepared in step (a) in an incubator in which the oxygen (O2) tension is equal to or less than about 15% to differentiate the embryoid bodies into vascular endothelial progenitor cells; and (c) isolating the vascular endothelial progenitor cells from the culture medium obtained in step (b).

Abstract: The present invention provides a process for isolating vascular endothelial cells from embryoid bodies differentiated from embryonic stem cells, which comprises: (a) treating embryoid bodies differentiated from embryonic stem cells with 0.005-0.015% trypsin and 0.05-0.15 mM ethylenediaminetetraacetate (EDTA) to obtain vascular endothelial cell clusters; and (b) treating the vascular endothelial cell clusters with 0.1-0.5% trypsin and 0.5-2 mM EDTA so as to separate the vascular endothelial cell clusters into single cells.

Abstract: A crankshaft set of a two-cylinder engine that is equipped with a flywheel may include a crankshaft that is mounted on an engine block, a first crank pin that is formed at one end of the crankshaft and is connected to a first piston through a connecting rod, a second crank pin that is formed at the other end of the crankshaft and is connected to a second crank pin through a connecting rod, and a flywheel that is disposed between the first and second crank pins and is integrally formed with the crankshaft. Accordingly, the twist and vibration characteristics are improved because the flywheel is disposed between the adjacent crank pins.

Abstract: A balancing assembly of an engine may include a crankshaft in which crank pins each connected to a connecting rod, are disposed at both ends thereof and that is equipped with a counterweight opposite to and corresponding to each crank pin, a balance shaft that is disposed at a distance from the crankshaft and that rotates by the crankshaft, and a balance weight that is eccentrically formed with a balance shaft and that absorbs vibration.

Abstract: The present invention relates to a method for culturing human embryonic stem cells (hESCs) in a hESC culture medium comprising a porous membrane, feeder cells being attached to a bottom of the porous membrane and a method for recovering human embryonic stem cells using the same.

Abstract: Disclosed is a biocompatible medical material and porous scaffold for use in tissue engineering, made from a biodegradable glycolide/?-caprolactone copolymer having a repeat unit of wherein x and y are integers greater than or equal to 18, the copolymer has an average molecular weight of about 10,000 daltons or more, and the molar ratio of glycolide: ?-caprolactone in the copolymer is about 4.0:6.0 to 6.0:4.0.

Abstract: Disclosed is a sequentially ordered biodegradable lactide (or glycolide or lactide/glycolide)/&egr;-caprolactone multi-block copolymers having proper degradation properties and enhanced mechanical properties such as flexibility and elasticity and a process for the preparation thereof.

Abstract: A pn junction solar cell includes a pn junction structure including a p-type and a n-type semiconducting layer, a front contact electrode formed on the front surface of the pn junction structure through a contact pattern having a constant width, and a rear contact electrode formed on a rear surface of the pn structure. The front contact electrode is reduced in its width as it goes away from a terminal.

Abstract: A textured semiconductor wafer for a solar cell includes a plurality of grooves being formed on a surface of the semiconductor wafer. The grooves are formed in the step of depositing a protector in the form of islands on the surface by spray process or screen-printing process, dipping the wafer into an isotropic etching solution to etch a portion of the surface where the protector is not deposited, and removing the protector.

Abstract: Disclosed is a biocompatible medical material and porous scaffold for use in tissue engineering, made from a biodegradable glycolide/&egr;-caprolactone copolymer. The medical material and porous scaffold have excellent mechanical properties such as flexibility and elasticity, and appropriate hydrolytic properties. Due to its superior mechanical properties including elasticity, flexibility and appropriate biodegradation time, it can be used effectively as a porous scaffold for tissue cell culture reproduction such as for artificial skin, blood vessels, dental matrix and wound coverings.

Abstract: A solar cell using a ferroelectric material(s) is provided with a ferroelectric layer at the front surface or the rear surface thereof, or at the front and the rear surfaces thereof. The ferroelectric layer is formed with a ferroelectric material such as BaTiO3, BST((Ba,Sr)TiO3), PZT((Pb,Zr)TiO3) and SBT(SrBi2Ta2O7).

Abstract: The present invention relates to novel antibacterial agents wherein the lone pair electrons of nitrogen atoms of amine compounds with high boiling point or water-soluble polymer with basic nitrogen at the backbone or side chain are coordinated with silver ion, and antibacterial and deodorizing solution comprising them. Since the antibacterial agents of the present invention has silver (Ag) ion coordinated with the lone pair electrons of nitrogen atom, the problems of conventional silver (Ag) compounds, i.e., their ease discoloration in general waters such as tap water and industrial water, are solved, and the inherent antibacterial activity is maintained due to the stabilization of silver ion (Ag+). Also, since they are highly soluble in water, they can be prepared in liquid form to be used for antibacterial and deodorizing purposes.

Abstract: Disclosed is a sequentially ordered biodegradable lactide (or glycolide or lactide/glycolide)/&egr;-caprolactone multi-block copolymers having proper degradation properties and enhanced mechanical properties such as flexibility and elasticity and a process for the preparation thereof.

Abstract: A solar cell using a ferroelectric material(s) is provided with a ferroelectric layer at the front surface or the rear surface thereof, or at the front and the rear surfaces thereof. The ferroelectric layer is formed with a ferroelectric material such as BaTiO3, BST((Ba,Sr)TiO3), PZT((Pb,Zr)TiO3) and SBT(SrBi2Ta2O7).

Abstract: A technique for fabricating a solar cell includes an n+ emitter region first being formed on a front surface of the cell, and then front and rear insulating layers being formed on both sides of the cell. P (Phosphorus)-source and B (Boron)-source are printed on the front and rear insulating layers, respectively, and then both dopants are diffused into the cell at high temperature. Therefore, n++ region in the front side of the cell and BSF (back surface field) region in the rear side of the cell is formed. Front and rear contact patterns are formed on the front and rear insulating layers, respectively. The n++ region and BSF region are exposed after front and rear contacts are formed on the front and rear insulating layers, respectively. The front and rear contacts contact the n++ region and BSF region, respectively.