Researchers in AIST, in collaboration with JFE Steel Corporation and Kurita Water Industries Ltd, developed a treatment process for ironworks wastewater containing high concentrations of nitrate by combining nitrogen gas aeration, methanol addition, and the membrane bioreactor.
Nitrate contained in wastewater can cause eutrophication of rivers, lakes, and marshes, as well as contamination of soil and groundwater, thus appropriate treatment is needed to prevent its release into the environment. This research developed a new wastewater treatment process using nitrogen gas aeration as the existing ironworks infrastructure. A demonstration test using a 4,000-L pilot was successful in efficiently treating ironworks wastewater containing more than 6,000 mg/L of nitrate. In addition, microbial analysis revealed that a denitrifying bacterium was involved in the effective nitrate removal. This new process is expected to be used in various industrial sectors where the treatment of wastewater with high nitrate concentrations is a problem.

AIST Researchers, in collaboration with the University of Tokyo, have shown that in the stinkbug Plautia stali, for which the gut symbiotic bacteria are essential for survival, (i) the morphology and function of the symbiotic organ developed at the posterior end of the digestive tract differ between nymphs before metamorphosis and adults after metamorphosis, (ii) the transition of the symbiotic organ from the nymphal to adult form is controlled by metamorphosis-regulating genes, (iii) the nymphal symbiont is specialized for retention of the gut symbiotic bacteria, whereas the adult symbiont is, in addition, involved in food digestion and absorption, (iv) the adult symbiont synthesizes large amounts of amino acids necessary for eggshell formation, and (v) these metamorphosis-associated changes of both the stinkbug host and the bacterial symbiont support the vigorous reproductive capacity of adult stinkbugs, which consume large amounts of food and lay an egg mass every few days.
This study demonstrates that metamorphosis, one of the factors that support insect diversity and prosperity, regulates the function of not only the insects themselves but also the symbiotic bacteria therein. This is an important achievement that uncovers a high degree of functional integration of different organisms in a symbiotic relationship, and may contribute to the development of pest control technologies targeting the mechanisms of metamorphosis and symbiosis.

AIST proposed the general requirements of an international standard for dynamic signs with Mitsubishi Electric Corporation, and the proposal was adopted as ISO 23456-1:2021.
The more effective sign system will be established by developing individual standards under this international standard. We are expecting for the society sharing with various age groups, cultures, and perceptual and physical characteristics, such as the elderly and wheelchair users under the concept of accessibility for all people.

Researchers at AIST have developed a process technology for alternately stacking cubic single-crystal (nanocube) monolayers of barium titanate (BTO), a dielectric material, and multilayer graphene sheets.
The technology developed in this research makes it possible to fabricate an extremely thin multilayer structure consisting of monolayers of two-dimensionally ordered BTO nanocubes of about 20 nm in size and multilayer graphene sheets of 2–3 nm in thickness, and is expected to be a fundamental technology to realize a dramatically thin multilayer structure with alternating dielectric and electrode layers in a multilayer ceramic capacitor (MLCC).

Researchers in AIST developed neural network computing technology that has ultra-low latency and low power consumption and uses a silicon photonic integrated circuit instead of an electronic circuit with Nippon Telegraph and Telephone Corporation, with the support of the Japan Science and Technology Agency (JST).
This technology performs machine learning computations using a photonic integrated circuit. The electrical signals of multidimensional data to be analyzed are input to different input ports of a photonic integrated circuit and converted to optical signals, and computations are performed when the converted optical signals pass through the large number of optical interferometers built into the photonic integrated circuit. The computation results are then output as the light intensity distribution of multiple output ports.
This technology was used to realize neural network computing by only a photonic integrated circuit without passing through an electronic circuit. In this neural network computing, computations are completed simply by propagating light in a photonic integrated circuit with fixed parameters. This means that sequential switching such as with digital electronic circuits is not needed, enabling computations with a latency time of 1/1000 or less and power consumption a few percent of that of an electronic circuit. In addition, photonic circuits can be clocked at speeds ten times or faster than electronic circuits, so the amount of data processed per unit of time can also be increased. With these features, this technology is expected to be applied to AI accelerators that complement digital electronic circuits.

Researchers in AIST developed a measurement method of oleic acid in live cattle by magnetic resonance.
A magnetic resonance experiment was conducted on beef fat samples, and it was found that the length of the proton transverse relaxation time is highly correlated with the content of unsaturated fatty acids such as oleic acid in beef fat. This was used to successfully estimate the oleic acid content with an error of 2.2 % from the proton transverse relaxation time of beef fat. The application of this discovery to analysis of data acquired by a magnetic resonance surface scanner in separate development will pave the way to enable nondestructive, noninvasive, in-situ measurement of unsaturated fatty acid content in live beef cattle.

Researchers in AIST developed a technology for generating isolated surface acoustic wave pulses jointly with the Tokyo Institute of Technology, Institut Néel of the French National Centre for Scientific Research, and Ruhr University Bochum, and that technology was used to realize highly efficient transfer of single electrons.
Establishment of a means to transfer information between separated qubits is essential for realization of a general-purpose quantum computer. Research has been promoted on technology to transfer single electrons using surface acoustic waves as a means of transferring the quantum information of electrons. On the other hand, in previous research that transferred electrons using surface acoustic wave bursts of a certain time width, there were issues due to extra waves not involved in electron transfer. The technology developed by this research to transfer single electrons using isolated surface acoustic wave pulses enables to eliminate the adverse effects of extra surface acoustic waves on surrounding electrons. As such, it will contribute to realization of qubit integration as a highly efficient means of transferring quantum information with suppress disturbance to surrounding qubits.