Japan Agency for Marine - Earth Science and Technology

Yokosuka, Japan

The Japan Agency for Marine-Earth Science and Technology , or JAMSTEC , is a Japanese national research institute for marine-earth science and technology. It was founded as Japan Marine Science and Technology Center in October 1971 and became an Independent Administrative Institution administered by the Ministry of Education, Culture, Sports, Science and Technology in April 2004. Wikipedia.

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Japan Agency for Marine - Earth Science and Technology | Date: 2017-07-05

The present invention provides a radical polymerization method that enables synthesis, at a high conversion rate, of polymers having a relatively uniform molecular weight and is applicable to various monomers that are generally available, and an apparatus used for the method. The present invention relates to a method for producing a polymerization product by continuously or intermittently circulating, within a flow path of the radical polymerization apparatus, a reaction solution containing a monomer and a radical polymerization initiator. Heating of the reaction solution that has flowed into a heating-initiation unit to a predetermined temperature is performed in a condition in which the radical polymerization initiator, contained in a volume obtained when the reaction solution that has flowed into the heating-initiation unit is temporally sliced, is cleaved all at once (a condition in which the radical polymerization initiator contained in the volume is heated to the predetermined temperature simultaneously across the radial direction of a cross section of the flow path). The present invention relates to a radical polymerization reaction apparatus including a heating medium production unit 10, a heating medium-reaction solution mixing unit 20, a cooling unit 30, and a recovery unit 40 for a reaction mixture, all of which are communicatively connected by the flow path. The present invention relates to a radical polymerization reaction apparatus including a heating reaction unit 60, a cooling unit 70, and a recovery unit 80 for a reaction mixture, wherein all of which are communicatively connected by the flow path.

Japan Agency for Marine - Earth Science and Technology | Date: 2017-03-29

In order to efficiently compensate for effects of the Doppler shift, a receiving device 101 includes: a Doppler estimator 11 that estimates a Doppler-shift frequency fdc of a received signal; a multiplier 12 and an LPF 13 that detect the received signal based on a carrier frequency fc of the received signal and the Doppler-shift frequency fdc estimated by the Doppler estimator 11; a timing corrector 161 that corrects a timing T for extracting symbols of the received signal after detection by the LPF 13, so as to track the Doppler shift; a symbol extractor 14 that extracts received symbols from the received signal after detection by the LPF 13 at a timing corrected by the timing corrector 161; and an adaptive equalizer 15 that estimates and determines symbols from the received symbols extracted by the symbol extractor 14.

Japan Agency for Marine - Earth Science and Technology | Date: 2017-06-07

Provided herein are a preprocessing apparatus and a preprocessing method for gas analysis that are capable of separating and extracting a target gas with high purity. The preprocessing apparatus 1 for gas analysis includes a water trapping section 3 and an adsorption section 5. The water trapping section 3 includes a first cold trap CT1 and a second cold trap CT2. The first cold trap CT1 is configured to cool sample water at a first temperature, thereby removing a liquid phase. The second cold trap CT2 is configured to further cool to-be-purified target gas containing water vapor, which has been purified (dried) by the first cold trap CT1, at a second temperature, thereby removing the water vapor to obtain the to-be-purified target gas not containing water vapor. The adsorption section 5 is configured to adsorb a non-target gas for extraction in the to-be-purified target gas using a getter. The obtained target gas is introduced into an analysis device 11.

Japan Agency for Marine - Earth Science and Technology | Date: 2016-10-03

Disclosed is a method for suppressing the growth of a target cell, which is not limited in the type of a target cell and the type of a protein to be expressed in the target cell and needs not any preparatory experiment for determining a codon to be contained in a protein to be expressed in a target cell. Specifically disclosed is a method for suppressing the growth of a target cell, which comprises the steps of: incorporating DNA containing a region encoding a protein into the target cell, and allowing a protein encoded by the DNA to be expressed in the target cell into which the DNA has been incorporated. The region contained in the DNA comprises a tri-nucleotide sequence. The tri-nucleotide sequence is selected from codons that define at least some amino acid species constituting the protein, and is complementary to at least some codons that are used in the target cell at a frequency of 0.2 or less.

Japan Agency for Marine - Earth Science and Technology | Date: 2017-04-12

The calculation efficiency is improved in a particle simulation. A particle simulation device 10, which calculates the position and velocity of particles on the basis of the interaction force between particles in a work space, comprises: a position information acquisition unit 12 that acquires position information for the particles; a particle number setting unit 13 that sets particle numbers for the particles; a pair setting unit 14 that selects pairs of particles and sets a pair number, on the basis of the position information; a reference information generation unit 15 that generates a matrix from the pair numbers and the particle numbers, and generates reference information for referencing the pair numbers from the particle numbers on the basis of a matrix in which the order of the rows of the matrix are sorted on the basis of the particle numbers; a contact force calculation unit 16 that calculates the interaction force of the particles in the pairs; a sum calculation unit 17 that calculates a sum of interaction forces for each particle on the basis of the reference information; and a particle information calculation unit 18 that calculates the position and velocity of the particles on the basis of the sum of interaction forces.

Japan Agency for Marine - Earth Science and Technology | Date: 2017-09-20

An image processing apparatus capable of generating an image containing a cloud having a color corresponding to a state of the atmospheric air is provided. An image processing apparatus comprising: a storage device storing weather data representing a state of an atmospheric air in at least one of a plurality of areas existing within a predetermined range; and a control device computing a color of a cloud about at least one area by using the weather data.

Agency: GTR | Branch: NERC | Program: | Phase: Research Grant | Award Amount: 196.01K | Year: 2016

Subduction zones are located where one of the Earths tectonic plates slides beneath another - this motion is controlled by the plate boundary fault. These plate boundary faults are capable of generating the largest earthquakes and tsunami on Earth, such as the 2011 Tohuku-oki, Japan and the 2004 Sumatra-Andaman earthquakes, together responsible for ~250,000 fatalities. Although some plate boundary faults fail in catastrophic earthquakes, at some subduction margins the plates creep past each other effortlessly with no stress build-up along the fault, and therefore large earthquakes are not generated. Determining what controls whether a fault creeps or slips in large earthquakes is fundamental to assessing the seismic hazard communities living in the vicinity of plate boundary faults face and to our understanding of the earthquake process itself. In the last 15 years a completely new type of seismic phenomena has been discovered at subduction zones: silent earthquakes or slow slip events (SSEs). These are events that release as much energy as a large earthquake, but do so over several weeks or even months and there is no ground-shaking at all. SSEs may have the potential to trigger highly destructive earthquakes and tsunami, but whether this is possible and why SSEs occur at all are two of the most important questions in earthquake seismology today. We only know SSEs exist because they cause movements of the Earth that can be measured with GPS technology. Slow slip events have now been discovered at almost all subduction zones where there is a good, continuous GPS network, including Japan, Costa Rica, NW America and New Zealand. Importantly, there is recent evidence that SSEs preceded and may have triggered two of the largest earthquakes this decade, the 2011 Tohuki-oki and 2014 Iquique, Chile earthquakes. Therefore, there is an urgent societal need to better understand SSEs and their relationship to destructive earthquakes. We know little about SSEs because most of them occur at depths of 25-40 km: too deep to drill and to image clearly using seismic data, a remote method that uses high-energy sound waves to probe the Earths crust. The Hikurangi margin of northern New Zealand is an important exception. Very shallow SSEs occur here at depths of c. 5 km below the sea bed, and they occur regularly every 1-2 years. This SSE zone is the only such zone worldwide within likely range of modern drilling capabilities and where we can image the fault clearly with seismic techniques - this location provides us with an opportunity to sample and image the fault zone that slowly slips. This will allow testing of a number of different hypotheses proposed to explain SSEs. We can also compare the properties of these rocks with drilling and seismic data from other locations such as Japan, where the faults behave differently and generate very large earthquakes. Through this comparison we can get closer to understanding why some subduction margin faults fail in large earthquakes and others do not and what fault properties control the different slip processes. Before the drilling can take place we need 3D seismic data to characterise the drill site to highlight any potential risks and to allow us to learn more about how rock properties vary in three dimensions away from the drill sites. Even before or without drilling the seismic images will provide important details of the slow slip process and fault properties. We will use a new technique, called full-waveform inversion (FWI) that can produce high resolution models of the speed of sound waves through the Earths crust. Sound waves travel slower through rocks that contain a lot of fluids so we will look for low velocity anomalies signifying the presence of fluids, which models have suggested could allow generation of SSEs. The groundbreaking FWI imaging of the New Zealand subduction zone will be the first of its kind, providing information on fault zone properties at unprecedented resolution.

Japan Agency for Marine - Earth Science, Technology and Toray Industries Inc | Date: 2016-03-23

A sufficient joint strength is easily achieved in a joint structure between a fiber-reinforced plastic and another member. A joint structure 10 is a joint structure between a first member 100 having a pillared end part 100a made of a fiber-reinforced plastic and a second member 200 different from the first member 100. The end part of the first member 100a is reversely tapered in an axial direction, while a joining member 300 is disposed along a reversely tapered form of the end part 100a. The second member 200 is provided in contact with an end face of the first member 100 and connected to the joining member 300. A plurality of fibers 110a substantially extending in the axial direction of the end part 100a of the first member 100 are provided within the end part 100a and disposed to form a larger angle with the axial direction of the end part 100a of the first member 100 as they are disposed to be closer to a surface constituting the reversely tapered form in a radial direction of the end part 100a.

Matsueda M.,Japan Agency for Marine - Earth Science and Technology
Geophysical Research Letters | Year: 2011

Eastern Europe and Western Russia experienced a strong heat wave during the summer of 2010. Maximum temperatures exceeded 40°C in early August, resulting in over 15,000 deaths and many wildfires, inflicting large economic losses on Russia. The heat wave resulted from strong atmospheric blocking that persisted over the Euro- Russian region from late June to early August. This study investigates the predictabilities of extreme Euro-Russian blocking and of the blocking-induced extreme surface temperatures in the summer of 2010, using medium-range ensemble forecasts. The results show that the blocking in June-August (JJA) of 2010 was easily predictable, even for a lead time of +216 hr; however, the blocking that occurred from 30th July to 9th August showed a lower predictability in forecasts over +144 hr compared with other blocking occurrences in JJA of 2010. This low predictability resulted in the failure to predict the extreme temperatures associated with the mature blocking in early August. Most of the forecasts predicted a decay of the blocking earlier than that observed. Copyright © 2011 by the American Geophysical Union.

Japan Agency for Marine - Earth Science and Technology | Date: 2016-02-10

The purpose of the present invention is to provide a nuclease that secretes natural nonpathogenic microorganisms extracellularly, has higher specific activity than conventional nucleases, and is useful in nucleolytic degradation on an industrial scale. This purpose is achieved with an extracellularly secreted nuclease derived from Streptomyces bacteria, the nuclease having specific activity equal to or greater than the specific activity of Benzonase^() when supplied to double-stranded DNA for 30 minutes at 37C in 20 mM Tris/HCl (pH 8.5) containing 1 mM MgCl_(2) and 1 mM CaCl_(2) after purification, using double-stranded DNA, single-stranded DNA, and RNA as substrates.

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