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A method for authenticating a security mark containing a photochromic compound can provide higher security performance. The method comprises a process of irradiating a security mark containing a photochromic compound with excitation light, a process of acquiring first security information on a time-dependent change in the absorption spectrum and/or reflection spectrum of the security mark after the irradiation with excitation light, and a process of checking the acquired first security information against previously acquired first security information on the security mark. In this method, the security mark preferably contains two or more photochromic compounds different from one another in color development and/or in quenching rate after the color development in a photochromic reaction.


Patent
Japan Science and Technology Agency | Date: 2017-01-04

Provided is an optical network which makes it possible to increase frequency use efficiency of an optical signal when transmitting wavelength division multiplexed light. One or more optical path cross connection devices (OXC) through which a wavelength division multiplexed light signal travels when being transmitted from a prescribed transmission node to a prescribed receiving node, wherein when an optical channel inputted from an input optical fiber (Fi1-Fin) is routed or switched to one or more output optical fibers (Fo1-FoN), a plurality of optical channels adjacent on a frequency axis which are outputted to the same output optical fiber (FoN) in the input optical fibers (Fi1-Fin) are routed or switched to an output optical fiber by demultiplexing the plurality of optical channels as one bundle without demultiplexing each of the optical channels individually. Thus, it is possible to increase frequency use efficiency of an optical signal when transmitting wavelength division multiplexed light, because the instances of optical channel filtering are reduced and the loss caused by filtering is decreased.


Patent
Japan Science and Technology Agency | Date: 2017-01-04

The present invention provides a thermal emission source capable of switching the intensity of light at a high response speed similarly to a photoelectric conversion element. A thermal emission source 10 includes: a two-dimensional photonic crystal 12 including a slab 11 in which an n-layer 112 made of an n-type semiconductor, a quantum well structure layer 114 having a quantum well structure, and a p-layer 111 made of a p-type semiconductor are stacked in the mentioned order in the thickness direction, wherein modified refractive index areas (air holes 121) whose refractive index differs from the refractive indices of the n-layer 112, the p-layer 111 and the quantum well structure layer 114 are cyclically arranged in the slab 11 so as to resonate with a specific wavelength of light corresponding to a transition energy between the subbands in a quantum well in the quantum well structure layer 114; and a p-type electrode 131 and an n-type electrode 132 for applying, to the slab 11, a voltage which is negative on the side of the p-layer 111 and positive on the side of the n-layer 112.


Patent
Japan Science and Technology Agency | Date: 2017-04-05

An inverse photoemission spectroscopy apparatus is configured to detect a light generated by the relaxation of electrons to an unoccupied state of a sample.The apparatus includes an electron source for generating electrons with which a sample is irradiated, a wavelength selector for extracting a light having a certain wavelength from the light generated in the sample, a photodetector for detecting the light extracted by the wavelength selector; and a focusing optics disposed between the sample and the photodetector. The electron source contains yttrium oxide as a thermionic emission material.


Patent
Japan Science and Technology Agency | Date: 2017-04-05

The present invention provides an alga that is modified to have suppressed expression of ATG8 through (i) overexpression of MEX1 and/or (ii) silencing of ATG8 with a miRNA and exhibits increased photosynthetic productivity to achieve increased biomass productivity in algal cells. The invention further provides a method of producing such a modified alga, a method of biomass production using such a modified alga, and starch produced using such a modified alga.


Patent
Japan Science, Technology Agency and Tokyo Institute of Technology | Date: 2017-01-11

The invention related to a material that can stably hold an imide anion (NH_(2)^(-)) therein even in the atmosphere or in a solvent, and a method for synthesizing the material and a use of the material. A mayenite-type compound into which imide anions are incorporated at a concentration of 1 10^(18) cm^(-3) or more are provided. The mayenite-type compound can be produced by heating a mayenite-type compound including electrons or free oxygen ions in a cage thereof, in liquefied ammonia at 450 to 700C and at a pressure of 30 to 100 MPa. The compound has properties such that active imide anions can be easily incorporated into the compound and the active imide anions can be easily released in the form of ammonia from the compound, and the compound has chemical stability.


Provided is a block copolymer that makes it possible to produce inorganic nanoparticles that can be dispersed in an organic solvent, the inorganic nanoparticles being of uniform size and a reducing agent not having to be used. A block copolymer including a catechol segment represented by formula (1).


Patent
Japan Science and Technology Agency | Date: 2017-01-25

Provided is a method for producing an aniline derivative by fermentation from a carbon source such as glucose. A method for producing an aniline derivative, the method including the following steps: production of microorganisms capable of producing 1.8 g/L or more of 4-aminophenylalanine (4APhe) under prescribed culture conditions by introducing at least three exogenous genes into microorganisms having the ability to biosynthesize 4-aminophenylpyruvic acid from chorismic acid; and production of at least one aniline derivative selected from the group consisting of 4-aminophenylalanine (4APhe), 4-aminocinnamic acid (4ACA), 2-(4-aminophenyl)aldehyde, 4-aminophenylacetic acid, and 4-aminophenethylethanol (4APE) by bringing these microorganisms into contact with a carbon source under conditions suited to the growth and/or maintenance of these microorganisms.


Patent
Japan Science and Technology Agency | Date: 2017-01-18

Provided is a transistor including: a piezoresistor 10 through which carriers conduct; a source 14 that injects the carriers into the piezoresistor; a drain 16 that receives the carriers from the piezoresistor; a piezoelectric material 12 that is located so as to surround the piezoresistor and applies a pressure to the piezoresistor; and a gate 18 that applies a voltage to the piezoelectric material applies so that the piezoelectric material applies a pressure to the piezoresistor.


Patent
Japan Science and Technology Agency | Date: 2017-03-15

The object of the present invention is to provide a polymer brush which forms phase-separated structure in a gas phase. The polymer brush according to the present invention comprises a substrate and a polymer layer wherein the polymer layer comprises polymer chains each of which has one end fixed on the substrate and other end free-ended, and wherein a state of phase-separation between a polymer dense part and a polymer thin part reversibly changes in the polymer layer.

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