Tohoku Techno Arch Co., Ltd. Product Lineup

For non destructive inspection of defect such as inner surface of piping, etc., conventional percussion method has the disadvantage of being week to noise and having low spatial resolution (difficult to determine exact location). The magnetic leakage flux testing method being also a conventional method, overcomes the previous disadvantage, but it is not suitable for underground piping due to its difficulty to detect small defect, cost & time required to magnetize inspection object, and the large unit size that incorporates a permanent magnet. 　The percussion testing method proposed in this invention uses a TMR sensor to measure and analyze the natural frequency of a structure made of magnetic material from micro vibration to diagnose deterioration. The advantage of this method is "high spatial resolution and noise immunity because the magnetic field is measured at a short distance (2-3 cm) instead of acquiring sound wave at a long distance“, "suitable for underground piping because it targets demagnetized magnetic material" and "low sensor and calculation cost". In addition, facility that is constantly undergoing micro vibration may be able to perform the magnetic hammer testing without applying an external force.

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In conventional magnetic AC susceptibility measurement to measure magnetic material property, the susceptibility is detected by AC frequency. This disable to measure small amount of sample such as thin film and nanoparticle at low frequency (< 1 kHz) due to crowding of unbalanced voltage and detected voltage. Therefore, it is not possible to apply it to biomagnetic sensing.　 　DC / AC susceptibility is measured by different methods, and although measuring equipment with both measurement modes exists, simultaneous measurement is not possible. 　This invention combines magnetic AC susceptibility measurement and new analysis method based on Vibrating Sample Magnetometry (VSM), a method to measure DC susceptibility. 　This enables AC susceptibility detection in sideband frequency, improving detection sensitivity and enabling AC susceptibility measurement of small amount of sample that could not be measured so far. Moreover, simultaneous measurement of DC and AC susceptibility is also possible. Another major advantage is that it could be simply producedd by combining analysis method with conventional measurement equipment.

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So far, the laser doppler vibrometer or the accelerometer using microelectromechanical system is known to be the most high sensitive vibrometer with actual technology. However, many vibrometers can’t be used in one object due to its high cost. On the other hand, the strain gauge is known to be cheap but the sensitivity is not enough high in order to detect abnormal vibration. 　This invention has focus on bending a magnetic material can generate a high sensitive permeability variation where it can be detected as HF impedance variation, and the shape of cantilever. This invention can provide high-sensitivity vibration sensor at low cost.

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Chemically strengthened glass has become very popular as the cover glass for smartphones. This glass is made by immersing the glass in the potassium nitrate melt and exchanging ions between the sodium ions in the glass and the potassium ions in the potassium nitrate melt. Conventional methods to evaluate the chemically strengthened glass strength are the bending method and the optical waveguide method. However, these methods are not suitable for measuring locally the residual stress, and there is a limit in the glass samples that can be measured.　 　This invention is able to evaluate the residual stresses of the chemically strengthened glass in a non-contact, non-destructive and position-selective manner. In this invention, the residual stress is calculated from the volume variation ratio which increases with ion exchange, obtained by the microscopic Raman scattering spectrum.

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Particles with a uniform size of few 10 to 100 ㎛ are expected to be used as raw material for additive manufacturing (3D printer). The Pulsated Orifice Ejection Method (POEM) and the freeze-dry POEM (FD-POEM) developed by the inventor are used for their production. From the point of view of composition control and spheronization by surface tension, the raw material is preferable to be in slurry form. However, the precipitation in a short time and consequently high particle concentration cannot be achieved.　 　This invention makes possible to disperse particle for a relatively long time at a high concentration and to produce small & dense spherical particle than the conventional one using FD-POEM. Moreover, this invention can be applied to particle production of MoSiBTiC alloy, which is an ultra-high temperature material.

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Recently, III-nitride semiconductors (GaN and InGaN) have been attracting attention as semiconductor materials for light-emitting devices such as LED and lasers. This nitride semiconductor has a bandgap energy with wide range wavelengths from infrared to ultraviolet light, and it is a promising material for blue & green LED and semiconductor lasers with UV to infrared region emission wavelengths. However, in the case of nitride semiconductors, the equilibrium vapor pressure between the gas and solid phases of nitrogen is much higher than the conventional III-V materials, so it is not possible to fabricate GaN single crystal substrates at low cost. Another option is to use freestanding GaN substrates, but the current fabrication techniques are costly. 　This invention is able to fabricate nitride semiconductor freestanding substrates with low threading dislocation density at a low cost. This invention comprises a total of seven steps, from the process of forming a buffer layer having a nitride semiconductor on the growing substrate main surface, to the process of fabricating a plurality of nitride semiconductor freestanding substrates.

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The combinatorial optimization problem has been attracting attention in recent years as a method for solving different social problems. The quantum annealing method (QA) is expected to be a promising way to find solutions to these problems at high speed. However, the current QA is not suitable for solving large scale problem due to the implementation scale limitation and the necessity to prepare a dedicated system. The stochastic simulated annealing method (SC-SA) currently under research, which is a computing method based on probabilistic information, has no restriction due to its computation on a classical system, and it is power-saving. However, the speed is slow and it has difficulty for installation as the scale becomes larger.　　 　Therefore, this technology has been developed to solve optimization problem at high speed with low power consumption for less than two orders of magnitude compared to QA, with less implementation scale limitation and lower cost by using Quantum Monte Carlo (SC-QMC), a new annealing method based on stochastic operation.

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λ-Ti3O5 is the unique oxide material that shows a photo-induced phase transition by visible-light irradiation. It is expected for application for optical recording media such as CD, DVD, and BD because of its low environmental impact compared to conventional chalcogenide materials. However, the crystal size of λ-Ti3O5 is limited to nanometer scale because of its metastable nature. This invention enables λ-Ti3O5 thin films with large surface area (over 5x5mm) using pulsed-laser deposition (PLD) method with TiO2 as a raw material. 　In a conventional method, λ-Ti3O5 could not be fabricated directly on substrates and an intermediate seed layer was required so that the seed layer component diffuses into λ-Ti3O5, which hindered the phase transition. On the other hand, this invention can synthesize λ-Ti3O5 thin films directly on a substrate without the seed layer, and thus the λ-Ti3O5 thin films show a stable phase transition.

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Co-based Heusler alloy such as Co2MnGa or Co2MnAl has attracted attention as candidate materials for high-sensitivity sensor and high-efficiency thermoelectric conversion element thanks to their large anomalous Nernst and Hall effects. In order to realize these excellent properties, it is thought that a single crystalline bulk material or a thin film grown on a single crystalline substrate is necessary. Thus, such single crystalline samples have been produced. Considering that those materials are applied to actual devices, it is necessary that a polycrystalline film, which does not use a single crystalline substrate, shows the property equivalent to those of single crystalline material. 　This invention is able to provide a “polycrystalline Heusler alloy thin film" that does not require a single crystalline substrate, while showing the properties of anomalous Hall angle (θAH~7.5%) and anomalous Nernst coefficient (SANE~5μV/K) comparable to a single crystalline thin film. It can promote the control of crystal orientation and the improvement of crystallinity by sandwiching the polycrystalline layer with an insulating AlN layer.

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An inductor is known as an element that uses the induced electromotive force generated in a coil to stabilize the current in circuits. Circuit elements used in small electronic devices require miniaturization, but there is a fundamental limit for conventional inductors due to a physical restriction. This invention uses the principle of induction in spintronics physics, as the inventors have shown, that inductance emerges in uniform magnetic materials as a result of spin-orbit interaction, where any “twists” are not required like conventional coils or magnetic structures. This technology offers various inductor elements that are low-cost, stable against temperature variation, and capable of miniaturizing.

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“Black bodies” are substances that can completely absorb all kinds of light, and carbon nanotube (CNT) black bodies are known as substances that can almost completely absorb light. CNT black bodies can absorb more than 98% of light (electromagnetic waves) in a wide wavelength range of 200 nm-200μm from “ultraviolet” to “visible” to “far-infrared” light. CNT black bodies can be used for shielding cameras and optical equipment, infrared absorbers, thermal infrared sensors, and cooling electronic equipment. However, CNT black bodies are fine powders, and there have been some problems such as difficulties in manufacturing and handling them. This invention provides a nano-micro metal “black body” capable of absorbing light over a wide wavelength range from “ultraviolet” to “visible” to “infrared” light, and capable of selectively adjusting the absorption direction of light.

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　For CO2 fixation and usage, there are many systems that involve mass transfer, reaction and absorption between gas / liquid; for example the reaction of an amine absorption solution or calcium solution with a dilute CO2containing gas. The conventional spray, bubble, packed and wetted wall columns are increasing in size in order to increase the reaction interfacial area and detention time.　 　For the concentration, crystallization and drying in the salt manufacturing process in Japan, the conventional shaft kiln method has the same issue of the equipment size increase. The high energy consumption is also an issue since the bubbles are generated by boiling the liquid phase. 　This invention achieves the equipment downsizing by increasing the gas-liquid reaction field area by using the phenomenon that the gas phase introduced into the heat exchange mechanism using a rotary double tube is refined and retained in the solvent by the agitation and shearing force of the rotating cylinder. The heat transfer rate is improved and the energy saving is possible thanks to the removal of precipitate and boundary film on the rotating cylinder.

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【Fuel cell】 In order to construct a fuel cell system with high efficiency, high durability and low cost, it is necessary to clarify the transport phenomena of proton, oxygen, and water in the cell. By analyzing nano and micro scale flow phenomena and clarifying the correlation between the structural characteristics and the transport mechanism of each component, PEFC performance is expected to be improved. 【Secondary battery】 Due to increasing energy demand and environmental problems, secondary batteries that can be charged and discharged without emitting CO2 or nitrogen oxides are attracting attention. We have a track record of analyzing nano and micro scale flow phenomena such as ion flow in the electrolyte inside liquid and all-solid-state lithium-ion batteries. 【Semiconductor】 For advanced semiconductor devices, controls on the atomic layer level with a thickness error of ±0.5 Å on the wafer is required for the deposition process. In the past, it was necessary to optimize a large amount of experimental data in order to form a precise thin film. At Tokumasu Laboratory, we will elucidate the mechanism through numerical simulation and search for the optimum deposition mechanism.

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　In recent years, with the development of internet-based business, personal and confidential information are transmitted through optical communication network. It is becoming important to ensure the information security as the optical communication network increases in speed and capacity. Quantum Noise Stream Cipher (QNSC), which uses the quantum noise in light, is known as a physical layer optical cryptography with a high transmission speed. However, since it uses strong optical signal, it cannot achieve the perfect masking effect by quantum noise, so there is a possibility that some information in the random number sequence used for encryption is leaked to an eavesdropper. 　This invention is able to provide an optical secure communication system and device that are more secure and capable of high-speed transmission than the conventional QNSC by spreading the QNSC signal on the time axis. In the present invention, the QNSC signal is spread over time using a common key at the transmitter, and the timing of the received QNSC signal is corrected by using the common key shared in advance at the receiver. It is thus possible to achieve the optical secure communication with higher security and higher speed by also encrypting the random number sequence used for encryption.

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So far, a thin deformable mechanism that can be operated at hand has been developed to deform a thin plate into a curved shape. The stiffness of an object depends on the second moment of area and the Young's modulus of the material. So in a curving deformable mechanism, the second moment of area depends on the cross-sectional shape of the initial state. In other words, even if a metal plate with a high Young's modulus is used, the stiffness is low against bending. In addition, increasing the plate thickness in the bending direction increases the amount of plate elongation during bending, resulting in a smaller bendable range.　 　This invention is able to provide a deformable mechanism and gripper that can increase stiffness while keeping its thinness. This invention has an elongated plate shape, an elastic property to flex in the thickness direction and to twist around an axis along the length direction, and a pair of deformable bodies rotatably connected to an operating support. Each deformable body is characterized by the surfaces being configured to tilt in inward direction toward each other. This provides a deformable mechanism and gripper that can increase rigidity while remaining thin.

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In recent years, soft robot that can flexibly transform according to their environment and adapt to various environments has been developed. However, due to its flexible structure, soft robot can be damaged when they come into contact with sharp object, resulting in the loss of functionality such as mobility and deformability. Material such as polymer has been developed to self-repair damaged part. However, it can not repair itself in case of major damage. 　 This invention is able to provide a self-healing mechanism and a soft robot that can self-repair in any environment, regardless of external factor, even in case of major damage. This invention has a curing means consisting of 2 tubes containing 2 different liquids that gel or harden when mixed, which are wrapped around each others in spiral. The soft robot of this invention has this hardening means stretched along the deformed and flexible area. When the soft robot is damaged by contact with sharp object, the 2 tubes are also damaged and each liquid gels or hardens, allowing the robot to repair itself.

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Phenyl sulfate(PS) and indoxyl sulfuric(IS) are factor of Diabetic nephropathy(DN). These compounds are produced by the reaction of phenol and indole which are protein metabolites, with tyrosine phenol lyase and tryptophan indole lyase which intestinal bacteria have. Decreasing PS and IS in blood is important for DN treatment.　 　In the present study, certain sesame-derived lignans exhibited TPL and TIL inhibitory activity.

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　Instability after landing on the foot is one of the causes of frequent ankle sprains during exercise and falls in the elderly. Therefore, if stability in landing can be evaluated with high accuracy, the effect of treatment or functional recovery training or the effect of the use of exercise aids such as insoles can be properly evaluated.　 　Conventionally, stability has been evaluated by measuring the total trajectory length and trajectory area of the movement trajectory of the center of pressure. However, these parameters fluctuate relatively widely depending on the adjustment of posture by the balance function, the height of jumping, and the body weight. Therefore, the stability in landing may not be evaluated with high accuracy. 　The present invention relates to an algorithm for defining a stability range of dynamic stability for a center of pressure after landing.

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High production cost of mold (plate) is a major challenge to promote the use of nanoimprint technology. Replica mold of an expensive original mold is essential for cost reduction. Especially, replica mold that can resist to repeated usage has been expected. The resin replica mold currently in practical use is limited to a few mold transfer and has low repeat durability.　 　This invention is about a resin replica mold that is solid and repeatedly durable. This mold consists of an organic/inorganic hybrid material with inorganic particles dispersed in resin and has a higher indentation modulus than polyimide. Since fluidity is maintained even the inorganic particles mixing ratio is 60 wt%, the product can be easily manufactured by pressing the original plate mold and curing by light irradiation. Moreover, it is to both thermal and optical nanoimprinting because it has both heat resistance and ultraviolet light transmittance.

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Currently, a feeding and swallowing function evaluation device is known to evaluate the feeding and swallowing function of someone. If one has impaired semantic memory function, the feeding rate may be decreased even when the eating behavior is normal. However, existing feeding and swallowing function evaluation device does not output information on one’s semantic memory function, making it impossible to recognize the cause of the underestimated feeding rate.　 　This invention is able to provide a feeding and swallowing function evaluation device that can appropriately recognize the cause of one's underestimated feeding rate. This invention has a feeding behavior information acquisition unit, a correct/incorrect information acquisition unit, a feeding behavior evaluation information output unit and a semantic memory evaluation information output unit. In this invention, the evaluation of feeding and swallowing function is performed by a computer which acquires information on the correctness of one's response to a semantic memory task and outputs information on whether the semantic memory function is normal or not. This allows proper recognition of the cause of one's underestimated feeding rate.

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Porous body with nano to micro order small pores is expected to be used in many applications. Among materials that make up porous body, silicon carbide has attracted attention because of its high heat resistance temperature and excellent property as a semiconductor material. However, for the application of porous silicon carbide, it is necessary to consider not only the excellent property of silicon carbide, but also the structure of the porous material.　 　This invention is about a porous silicon carbide with porous structure having a wide range of pore sizes from nanoscale to millimeter scale and showing fractal nature, as well as its simple production method. The production method has the process of heating an organosilicon compound in metal vapor (such as Mg vapor) to form a composite of silicon carbide and metal oxide, and the process of eluting metal oxide from the composite. Porous silicon carbide produced by this method is suitable for application that requires a large surface area because of its high porosity.

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Although stainless steel is an industrially important iron alloy, its specific strength is inferior to that of other metals because of its large specific gravity. An iron alloy having low specific gravity and high strength is required for the transport equipment.　 　The present invention provides high strength iron alloy having the maximum 0.2% proof stress and the tensile stress more than 1000 MPa while having the specific gravity less than 7.

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A requirement for biocompatible Ti alloy for orthopedic implants is to suppress stress shielding, which occurs because of the large difference between Young’s moduli of the prosthetic stem and the cortical bone (10–30 GPa). Meanwhile, conventional autoclave sterilization before implant exhibits the discoloration and heaviest particulate contamination, and some multiple sterilization regimens for metallic materials may pose serious biological concerns. 　The present invention can provide the necessary functions to a Ti implant material without impairing the low Young's modulus of Ti alloy. It possesses high antibacterial properties with a high antibacterial activity value above 2.0 from the antibacterial test (JIS R 1702) and osseointegration fromhydroxyapatite formation on the surface of Ti alloy in simulated body fluid.

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Optical linear encoder is used as high accuracy displacement sensor for semiconductor manufacturing equipment and various absolute position detection methods have been implemented. However, complex micro-pattern combinations and detection opticsare necessary. For this purpose, an optical single-axis encoder thatuses white light source and diffraction grating with unequal tickspacing is proposed to detect the absolute position based on the spectrum of the analyzer. However, the rotational motion error of thegrating affects the position detection. 　The present invention is able to provide an optical absolute positionmeasurement device and method with high resolution and accuracyin single or double axis by analyzing the spectrum of a diffractedbunch light. An unequal spaced grating is provided to incident thebunch white light, and the absolute position is detected from the peakwavelengths detected on the optical spectrum of the analyzer.

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There is a guideline that concrete structure should not be demolded (removal of the mold) until the initial strength reach at a sufficient level. A simple and accurate strength measurement method is required before demolding in order to shorten the construction time. Conventionally, specimens should be prepared to measure the strength so it is time-consuming and costly. The some pin penetration methods are available, e.g. for shotcrete in tunnels, but they are not easy to introduce because of expensive specialized equipment requirements. 　The strength measurement on BOSS specimen which is extra-constructed on a structure is also known for its high accuracy, but it requires time for separating the specimen from the structure and does not allow the compressive test on-site. Other non-destructive test methods also exist, but there is no method applicable before demolding. 　This invention is about a simple technique for measuring the concrete strength on-site, from the pre-demolding stage, using a pin penetration device. The configuration of the measuring section and equipment enables high accurate measurement with reduced influence of coarse aggregate in a non-destructive manner.

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Deep ultraviolet light emitting device (DUV-LED) is fabricated from AlGaN-based nitride semiconductor. The substrate material for the AlGaN-based DUV-LED is required to have high lattice matching with AlGaN, wider band gap than AlGaN and high thermal conductivity. Aluminum nitride (AlN) is attracting attention since it satisfies those conditions.　 　The sublimation method is a conventional method for producing AlN single crystal, but the cost is high because of high temperature requirement, and temperature control is also difficult. 　Using this technology, single-crystal AlN seed crystal can be created at a relatively high speed under low-temperature and easy temperature control conditions.

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Today, several mechanisms that can switch between a deformable flexible state and a high rigidity state are known. For example, there is a mechanism to increase rigidity by applying negative pressure to the wire, or a mechanism in which adjacent connecting parts increase the rigidity of the joint area. However, there were various issues such as the rigidity limitation due to the limit of the negative pressure, the difficulty of achieving high rigidity at the extremity due to the length of the wire, or the inability to bend the wire in any direction.　 　This invention solves above issues, and is able to provide a variable stiffness deformable body and mechanism which can bend in any direction at flexible state, increase rigidity at high rigidity state, and make the entire body highly rigid even if it is lengthened. The invention is characterized by a long flexible deformable body, a long bag shaped body, a support mean and a fluid supply / discharge mean. The invention is able to fix the body shape at high rigidity even if the body is bent, twisted in any direction or straightened, by suppling the fluid into the bag interior.

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Fat and oil are easily oxidized by heat and light irradiation during the manufacturing process and storage. Since antioxidant measure depends on the oxidation cause, it is important to determine not only the oxidation level but also its cause in order to maintain the vegetable oil quality.　 　Although a method for identifying the oxidation cause through isomer analysis of lipid hydroperoxide by LC-MS/MS has been reported [1], this method is not versatile since it requires complicated operation, and laboratory level facility and equipment. On the other hand, this research has established a method to identify the oxidation cause using near-infrared spectroscopy (NIR), which is widely used for nondestructive analysis of food product. So far, NIR has been used to evaluate oil oxidation, such as peroxide value, carbonyl value, and conjugated diene value of vegetable oil, but it has not been applied to determine the oxidation cause. This invention is able to quickly and easily identify the cause for fat and oil oxidation.

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Although the Q factors of the 2D oscillator used in gyroscope must be matched in the x and y axial directions, they may differ slightly due to manufacturing error, etc. Thus, Q factor in each x and y axial direction needs to be matched independently. In a oscillator, vibration generates heat flow which affects the Q factor (thermoelastic loss). Therefore, it is possible to adjust the Q factor by adding a heat flow path in the structure or by blocking the heat flow. The 2D oscillator of this invention has a pre-fabricated machinable part to control the heat flow without changing significantly the stiffness, in addition to its basic structure. The Q factors in the 1st and 2nd modes, which are orthogonal to each other, can be controlled independently by cutting this machinable part appropriately.

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This invention related to a FM gyro sensor.　 　Conventional FM gyro has technical issue that accuracy is affected by temperature fluctuation. This is because it needs 2 different oscillators, thus, temperature different, manufacturing irregularity exists in between these two oscillators. 　This invention hires single oscillator and different oscillation mode are excited to it. 　By above mentioned method, high independency from temperature effect has been achieved. 　In addition to it, thanks to its unique method, this gyro sensor can be used as magnetic sensor, pressure sensor and so on. 　Various patent has been applied/granted and mature patent portfolio has been developed.

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The mechanism that switches between a flexible state, which can be easily deformed when applying external force, and a high stiff state, which can transmit force to the outside when contact is made, has been studied in the past. A gripper that grasps an object using this mechanism has also been proposed. There are a wide variety of grippers, some consisting of a plurality of connecting parts arranged in a row connected to each other with a rotation flexibility, and others consisting of beads arranged in a row through a wire. However, increasing its length results to the loss of friction force, so it is not possible to achieve a high stiff state and to change the shape by itself. 　This invention overcomes these issues, and provides a variable stiffness connecting body that can change its own shape and maintain a high stiff state with a relatively small force. This invention has pulleys on multiple connecting parts that are connected in a row. Each pulley has a string for rotation and is configured to allow switching between fixed and rotational states of the connecting parts. This invention can reduce the force required to keep the connecting body in a fixed and high stiff state, thus allowing to keep grasping the object with a relatively small force.

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Liquefaction is a phenomenon where the ground becomes in liquid form and looses suddenly its resistance. It occurs when vibrations from earthquake or construction are applied to soft ground containing lot of sand and having high groundwater level. It causes significant damage to structures located on the ground surface or underground. 　Therefore, the practical application of technology to assess the liquefaction level is required. 　There are conventional methods to assess liquefaction risk using AI, but they all require ground data. However, although those ground data can be collected by boring, method for Swedish weight sounding test or surface wave survey, these operations require huge resources. 　This invention can assess the liquefaction risk level without requiring the work of collecting ground data.

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Conventional manganese-silicide-based thermoelectric material MnSix has excellent thermoelectric property and thermal shock resistance. For example, the output factor S2σ (where S is the Seebeck coefficient and σ is the electrical conductivity), which is one of the thermoelectric property, is maximum 2.22 mW/K2m at 500C. 　However, MnSi (manganese monosilicide) is deposited in the layers in MnSix c-axis direction with a period of several tens microns, which causes a decrease of the figure of merit Z (output factor S2σ divided by thermal conductivity κ) of the material. 　This invention limits the MnSi layer deposition and provides a thermoelectric material with an excellent thermoelectric property and its manufacturing method.

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Dihydrofolate reductase (DHFR) is known as a target of the anticancer drug MTX, and research tools (kits for evaluating protein subcellular localization, etc.) utilizing the binding between Escherichia coli DHFR (eDHFR) and MTX or its analogues have been reported and sold. The inventors developed azoMTX, in which an azo group is introduced into MTX, and found that the binding to eDHFR by light irradiation can be regulated. They also found that the kinetics of eDHFR fusion protein expressed in cells can be manipulated by light using azoMTX derivatives. 【effect】 ・The structure of azoMTX is reversibly changed by light irradiation of a specific wavelength. The cis of azoMTX produced under UV irradiation strongly bound to eDHFR and inhibited its enzymatic activity, while the trans of azoMTX produced under visible light irradiation decreased the binding strength to eDHFR and the enzymatic reaction proceeded. ・The target protein was expressed as a fusion protein with eDHFR, and intracellular kinetics (localization) could be reversibly photomanipulated using an azoMTX derivative.

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When unsaturated fatty acid contained in abundance in rice oil and linseed oil, which are expected to have preventive effect against lifestyle-related diseases, is oxidized, it exhibits unpleasant odor and toxicity derived from peroxide and aldehyde. On the other hand, it has been reported that spermine, a polyamine compound, synergistically inhibits oxidation with vitamin E which is widely used as an antioxidant. However, polyamine compound has a characteristic odor and it is relatively expensive, so it is difficult to apply for a general usage. The inventors have found that polyethylenimine (PEI) can be used as an antioxidant with advantage over polyamine compound in term of odor, cost, and oxidation suppression ability. [Effect] 　- Increase oxidation inhibition by vitamin E 　- Synergistic antioxidant effect can be obtained for omega-3 oil, which does not well inhibit oxidation by vitamin E 　- Since PEI is insoluble in oil and highly viscous, it can be used for direct coating on oil storage container to obtain its oxidation supression effect.

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This invention realizes a P2P-type cloud storage mechanism based on the secret sharing method. Impossible to identify the saving destination Data is splited and stored in participating nodes. In addition, node-to-node communication is anonymous, making it secure and difficult to identify the storage location. The client doesn’t need to retain metadata Reduce the risk of metadata leak by decentralizing its storage in addition to the secret data itself by using the blockchain. Possible to retrieve data securely Secret data can be retrieved using user name and password. It can detect and eliminate brute force attack on username and password by mutual monitoring and majority voting among P2P nodes.

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Actually, the waste heat below 200℃ emitted by electronic device, etc., is difficult to control and therefore, it is not effectively reused. This heat reduces performance and lifespan of electronic device. A heat engine that uses MEMS to control the heat flow has been developed, but it requires a relatively large space to house the drive unit, making it difficult to integrate into small electronic device. 　This invention is able to provide nanosheet and nanosheet manufacturing method. This nanosheet can be easily integrated into small electronic device, etc. which can control heat flow. It has a copper oxide layer with Cu and O bonded in a chain forming a ladder pattern, and its thickness is less than 100 nm. Due to this thinness, the nanosheet can be easily integrated into electronic devices that are becoming smaller, and the thermal conductivity can be controlled easily.

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　With the increase of request for device miniaturization and thin crystal film quality improvement, the ion damage on substrate has become a major issue in sputtering. The magnetron sputtering method is widely used but since the plasma is formed directly between the target material and the substrate, “1 it is difficult to avoid ion damage”. This issue is amplified when generating highdensity plasma. In addition, since a single power supply is responsible for both the plasma generation and ion attraction, “2 it is impossible to independently control the ion flux and energy flowing into the target material”. Moreover, since the plasma is confined by the magnetic leakage flux on the target surface, “3 it is difficult to use for ferromagnetic material target”. 　This invention solves above 1/2/3 issues by generating highdensity plasma with helicon discharge and by controlling the plasma shape with a curved magnetic field, etc. This invention could also be considered to be used as a heating mechanism of the target material, or as an uniform & fast film deposition.

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Metal and ceramic repel each other when mixing due to their positive surface charge. So since they are dispersed away, the composite can not be formed. The conventional technology uses a binder composed mainly of polyvinyl alcohol to glue metal and ceramic. This is then sintered in order to make a composite powder. 　However, the binder reduces the functionality due to compositional change (specifically, mechanical property deterioration, optical absorbance decrease, etc.) and handling during production is difficult. 　This invention is able to easily make ceramic / metal composite by using carbon nanotube (CNT). Application of various powder to bulk material is expected, such as sintered material and composite material by 3D printer. It is also possible to create a pure composite of metal / CNT, and this technology is expected to improve the antioxidation property of the base metal material.

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　Various magnetic sensors such as the Hall sensor, are widely used for the realization of an advanced IoT society. In particular, magnetic sensors based on the tunnel magnetoresistance effect (TMR sensor) discovered at Tohoku University has made dramatic progress in increasing sensitivity, making it possible to detect a weak magnetic field such as bio-magnetic field. 　However, the conventional TMR sensor did not achieve both high sensitivity and accuracy. 　This invention is able to provide a TMR sensor with extremely high linearity output which is necessary to achieve high sensitivity and accuracy, by controlling the higher-order magnetic anisotropy of the used ferromagnetic material.

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TMR element showing the tunnel magnetoresistance (TMR) effect, has been applied to products such as magnetic sensor, non-volatile memory, etc. The TMR ratio, which represents the variation ratio of element resistance, is one of the element performance indicator and it is an important characteristic that influences the specification of the applied product. TMR element using amorphous FeCoB magnetic alloy and MgO tunnel barrier is currently the main material and can be fabricated by sputtering method which is suitable for mass production. This is an excellent material which becomes FeCo/MgO crystal when B is diffused by heat-treating the element and shows 200-600% TMR ratio. However, heat treatment with B diffusion could be a factor in reducing the functionality of other layers adjacent to FeCo. This invention provides a technology for Co-based magnetic irregular alloy showing TMR ratio comparable to FeCoB by low temperature heat treatment, even without the addition of B.

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The present invention relates to a thallium halide radiation detector such as thallium bromide (TlBr) used in a positron tomography imaging diagnostic apparatus (PET), a single-photon radiation computed tomography apparatus (SPECT), and the like, and to PET or SPECT equipped therewith.　 　On the background of PET, a radiation detector using a CdTe crystal is used for a high-performance type detector, but it has a problem that it is a covalent crystal, has a high melting point, and is expensive to fabricate. For example, the price of only a crystal per device is expensive at several hundred million yen. Therefore, thallium halide such as TlBr, which is inexpensive, has attracted attention as an alternative material to CdTe. 　According to the present invention, since conduction ions in thallium halide crystals such as TlBr do not cause polarization phenomena in the detector, an inexpensive thallium halide radiation detector with a long lifetime can be obtained. In addition, the present invention is applicable to general radiation detectors, not limited to PET.

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In a factory for example, the end of a wired network is an access point such as a wireless LAN. The connection to the object beyond that point is made by a wireless communication system. Therefore, the wireless IoT communication is important for network connection to object. Wireless IoT communication often uses wireless LAN, Bluetooth, etc., which are unlicensed band, causing interference between systems, resulting in throughput reduction or real-time performance lack.　 　This invention is able to suppress inter-system interference using adjacent same frequency bands and to improve space usage efficiency. This communication circuit is equipped with an access point for wireless communication with a plurality of sensor nodes. 　This invention measures the rotation period and direction of sensor nodes, controls the direction of the beam sent out from each access point, and communicates to sensor nodes available in the communication range. It suppresses inter-system interference using adjacent same frequency bands and improves space usage efficiency.

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Scintillators are used for detectors of X-ray, γ-ray, α-ray, β-ray, and neutron. In particular, high-density scintillator crystals have characteristics such as a) high radiation blocking ability, b) high effective atomic number, and c) high density. Although PbWO4 single crystal is widely used in existing high density scintillator materials, new scintillator materials are required for further improvement of detector performance and environmentally friendly lead-free scintillator materials.　 　The present invention makes it possible to provide new materials beyond existing scintillator materials as a result of utilizing the excellent crystal growth technology possessed by the inventors. Generally, high-density scintillator materials are known to have high melting points, but the difficulty of crystal growth overcame to complete the present invention (an example is shown on the right). At present, a large-diameter technology is being developed for mass-production of the crystal.

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Nondestructive evaluation (NDE) of cracks, delamination, and kissing bonds is important for safely managing and operating structures and components. Ultrasonic NDE is widely used, and ultrasonic phased array has become one of the primary methods for imaging internal defects. However, there are problems regarding measurement errors of closed defects, such as closed cracks, and discrimination of cracks against other defects and geometric changes.　 With the present invention, it has become possible to provide an imaging apparatus capable of detecting defects represented by closed cracks with high accuracy and high discrimination. Further application of the apparatus can be expected to detect bubbles and lesions contained in tissues. In the present invention, by utilizing the incident-wave-amplitude dependence of the fundamental scattered waves, the closed cracks can be visualized with a higher signal-to-noise ratio than the existing technology.

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