Toyohashi University of Technology

www.tut.ac.jp/english/index.html
Toyohashi, Japan

Toyohashi University of Technology , often abbreviated to Toyohashi Tech, or TUT, is a national engineering university located in Toyohashi, Aichi, Japan. Distinguished for the upper-division student body where over 80% of them are transfer students from 5-year Technical Colleges called Kōsens, the Toyohashi Tech is one of the only two Universities of Technology, a form of universities in Japan, the other being Nagaoka University of Technology. Toyohashi Tech is also noted for the fact that majority of the students proceed to graduate schools. The university is locally nicknamed Gikadai . Wikipedia.

SEARCH FILTERS
Time filter
Source Type

News Article | April 17, 2017
Site: phys.org

Molecular structures of unsubstituted and substituted poly (lactic acid). Credit: Tsuji, H. et al. Configurational Molecular Glue: One Optically Active Polymer Attracts Two Oppositely Configured Optically Active Polymers. Sci. Rep. 7, 45170; doi: 10.1038/srep45170 (2017). Hideto Tsuji, professor in Toyohashi University of Technology, and his colleagues have made a world-first discovery of 'molecular glue' action of a counterclockwise-helical molecule to glue two structurally-different clockwise-helical molecules together. This discovery was announced on March 24 in Scientific Reports. To bind two polymers coiled in the same direction was previously impossible. Consequently, the degree of freedom in polymer combination has increased, and development of new polymer materials with various properties has become possible. The research group led by Professor Hideto Tsuji conducts basic and applied researches on biodegradable polymers derived from renewable resources such as corn or potato starch. The group mainly studies a typical biodegradable polymer poly(lactic acid). Poly(lactic acid) is hydrolyzed and degraded in the human body and the resulting lactic acid is metabolized without causing adverse effects to the body. Because of this advantage, poly(lactic acid) is used in medical applications as a scaffold material for tissue regeneration and also in environmental applications. Poly(lactic acid) contains an asymmetric carbon and therefore occurs either as the L- or D-enantiomer, namely poly(L-lactic acid) or poly(D-lactic acid) (Fig. 1). Since the interaction between different enantiomers (i.e. between L and D) is stronger than that between the same enantiomers (e.g. between D and D), blending the two enantiomers results in co-crystallization of an L-enantiomer and a D-enantiomer (this phenomenon is also called stereocomplex formation). The stereocomplex has a higher melting point, better mechanical properties, and higher heat resistance and hydrolysis resistance than those of their constituent enantiomers, and therefore the stereocomplex can have wider applications than those of conventional biodegradable materials. Under these circumstances, stereocomplex formation between poly(lactic acid) has been actively researched in recent years. L-poly(lactic acid) is counterclockwise-helical, and D-poly(lactic acid) is clockwise-helical. Therefore, the fact that L-poly(lactic acid) and D-poly(lactic acid) form a stereocomplex together indicates that a counterclockwise-helical molecule and a clockwise-helical molecule are strongly attracted to each other. Tsuji et al. have also discovered that blending the L- and D-enantiomers of poly(2-hydroxybutanoic acid) (Fig. 1) (a poly(lactic acid) with its methyl group replaced by an ethyl group) results in stereocomplex formation as well. In addition, there are reports on the same phenomena occurring to poly(2-hydroxy-3-methylbutanoic acid) (Fig. 1) (a poly(lactic acid) with its methyl group replaced by an isopropyl group) and occurring even between poly(lactic acid) with different side chains (for example, between L-poly(lactic acid) and D-poly(2-hydroxybutanoic acid)). All these phenomena indicate the presence of strong interaction between a counterclockwise-helical molecule and a clockwise-helical molecule. This time, Tsuji et al. have found the action of a counterclockwise-helical molecule to glue two structurally-different clockwise-helical molecules that do not bind to each other otherwise (Fig. 2). This finding indicates that a clockwise-helical molecule would also have the action to glue two structurally-different counterclockwise-helical molecules that do not bind to each other otherwise. Through experiment using D-poly(lactic acid), L-poly(2-hydroxybutanoic acid), and D-poly(2-hydroxy-3-methylbutanoic acid), Tsuji et al. have discovered for the first time worldwide that counterclockwise-helical L-poly(2-hydroxybutanoic acid) acts as "helical molecular glue" to glue clockwise-helical D-poly(lactic acid) and clockwise-helical D-poly(2-hydroxy-3-methylbutanoic acid) and thereby co-crystallizes these two D-molecules despite that these two do not usually co-crystalize. This finding has opened the door to binding various polymers that are coiled in the same direction. Now that the degree of freedom in polymer combination has increased, development of new polymer materials with various properties has become possible. More information: Hideto Tsuji et al, Configurational Molecular Glue: One Optically Active Polymer Attracts Two Oppositely Configured Optically Active Polymers, Scientific Reports (2017). DOI: 10.1038/srep45170


Patent
LG Corp and Toyohashi University of Technology | Date: 2017-01-04

An airborne microbial measurement apparatus and a measurement method thereof are provided. An airborne microbial measurement apparatus according to an embodimentincludes a discharge apparatus including a discharge electrode and a voltage supply unit applying a high voltage to the discharge electrode. A substrate is provided to a side of the discharge apparatus to collect an airborne microbe from air by a high voltage applied to the discharge electrode. A reagent injection apparatus supplies a dyeing reagent to the microbe collected on the substrate or a DNA of the microbe. A light emission measurement apparatus senses a quantity of light generated from the DNA to which the dyeing reagent is supplied. The discharge apparatus includes a controller controlling the voltage supply unit so that the voltage is applied to collect the airborne microbe or destroy an external wall of the collected airborne microbe.


Patent
Sharp Kabushiki Kaisha and Toyohashi University of Technology | Date: 2016-12-08

Provided is an ion sensor including a supporting substrate, a plurality of cells, a silicon substrate, a plurality of transistors, and an analog-digital conversion circuit. The plurality of cells, the plurality of transistors, and the analog-digital conversion circuit are provided above the supporting substrate. Each of the plurality of transistors has a corresponding gate provided on a first surface of the silicon substrate. The analog-digital conversion circuit is provided on the silicon substrate. The ion-sensing surface is provided on a second surface of the silicon substrate. The second surface is opposite to the first surface.


Patent
Sumitomo Electric Industries and Toyohashi University of Technology | Date: 2017-09-13

A transformer includes, as a front stage circuit, a switch series unit, capacitors, and a ground electrical path. The switch series unit includes odd-numbered switches and even-numbered switches configured to be alternately turned ON, and is, as a whole, connected in parallel to a power supply. Assuming that mutual connection points of the respective switches and points at both ends of the switch series unit are regarded as m nodes in total, and one of the points at the both ends is regarded as a ground node, the capacitors are provided on at least one electrical path of a first electrical path that combines odd nodes and leads the odd nodes to a first output port, and a second electrical path that combines even nodes and leads the even nodes to a second output port, and the capacitors are present so as to correspond to (m - 1) nodes excluding the ground node. The ground electrical path connects the ground node directly to the first output port without an interposed capacitor. The transformer further includes, as a rear stage circuit, an element series unit and inductors. The element series unit is composed of a pair of semiconductor elements that are connected in series to each other and perform conducting operations of mutually opposite polarities. One of both ends of the element series unit is connected to the first output port and to a grounded end of the load while the other end of the element series unit is connected to the second output port. The inductors are provided on a third electrical path that leads a non-grounded end of the element series unit to the grounded end of the load, and a fourth electrical path that leads a mutual connection point of the pair of semiconductor elements to a non-grounded end of the load, respectively.


Patent
Sumitomo Electric Industries and Toyohashi University of Technology | Date: 2017-09-13

A transformer includes, as a front stage circuit, a switch series unit and capacitors. The switch series unit includes odd-numbered switches and even-numbered switches configured to be alternately turned ON, and is, as a whole, connected in parallel to a power supply. Assuming that mutual connection points of the respective switches and points at both ends of the switch series unit are regarded as m nodes in total, the capacitors are provided on at least one electrical path of a first electrical path that combines odd nodes and leads the odd nodes to a first output port, and a second electrical path that combines even nodes and leads the even nodes to a second output port. The capacitors are present so as to correspond to at least (m - 1) nodes. The transformer includes, as a rear stage circuit, an element series unit and inductors. The element series unit is composed of a pair of semiconductor elements that are connected in series to each other and perform conducting operations of mutually opposite polarities. One of both ends of the element series unit is connected to the first output port while the other end thereof is connected to the second output port. The inductors are provided on at least one electrical path of a third electrical path that combines two nodes that are points at the both ends of the element series unit, and leads the two nodes to one of both ends of the load, and a fourth electrical path that leads one node that is a mutual connection point of the pair of semiconductor elements to the other end of the load. The inductors are present so as to correspond to at least two nodes of the three nodes in total.


Tsuji H.,Toyohashi University of Technology
Advanced Drug Delivery Reviews | Year: 2016

Upon blending enantiomeric poly(L-lactide) [i.e., poly(L-lactic acid) (PLLA)] and poly(D-lactide) (PDLA) [i.e., poly(D-lactic acid) (PDLA)] or synthesis of stereo block poly(lactide) [i.e., poly(lactic acid) (PLA)], a stereocomplex (SC) is formed. PLA SC has a higher melting temperature (or heat resistance), mechanical performance, and hydrolysis-resistance compared to those of neat PLLA and PDLA. Because of such effects, PLA SC has been extensively studied in terms of biomedical and pharmaceutical applications as well as commodity, industrial, and environmental applications. Stereocomplexation stabilizes and strengthens PLA-based hydrogel or nanoparticles for biomedical applications. Stereocomplexation increases the barrier property of PLA-based materials and thereby prolongs drug release from PLA based materials. In addition, PLA SC is attracting significant attention because it can act as a nucleating agent for the widely used biobased polymer PLLA and thereby the heat resistance of PLLA-based materials can be enhanced. Interestingly, a wide variety of SCs other than PLA SC are found to have been formed in the enantiomeric substituted PLA blends and stereo block substituted PLA polymers. In the present review article, a decade of progress in investigation of PLA SCs is summarized. © 2016 Elsevier B.V.


Patent
Sumitomo Electric Industries and Toyohashi University of Technology | Date: 2016-07-20

A transformer is provided between a power supply and a load, and includes a front stage circuit and a rear stage circuit each having a function of performing switching so as to alternately invert a polarity of output relative to input. The transformer further includes: a series unit provided in at least one of the front stage circuit and the rear stage circuit and composed of a pair of reactance elements connected in series to each other via a connection point; and a switch device which, with both ends of the series unit serving as a first port, causes a part between one end of the series unit and the connection point, and a part between the other end of the series unit and the connection point, to serve as a second port alternately through switching while inverting a polarity, and executes one of power transmission from the first port to the second port, and power transmission from the second port to the first port.


Patent
Sumitomo Electric Industries and Toyohashi University of Technology | Date: 2016-07-06

A transformer is provided between a power supply, and a load with a resistance value R, and includes a two-terminal pair circuit composed of n-number of reactance elements that are mutually connected, where n is a natural number equal to or greater than 4. With respect to any value of the resistance value R of the load, an input impedance Z_(in) of the two-terminal pair circuit has a real number component of kR, where k is a constant, and an imaginary number component of 0. Such a transformer has a small size and a light weight, and does not need a coil, an iron core, and the like as used in a conventional transformer.


Patent
Sumitomo Electric Industries and Toyohashi University of Technology | Date: 2016-07-06

A transformer of distributed-constant type is provided between an AC power supply with a frequency f and a load with a resistance value R, and includes: a first converter connected to the AC power supply and having a length of /4; and a second converter provided between an end of the first converter and the load, and having a length of /4, where a wavelength at the frequency f is . Such a transformer has a small size and a light weight, and does not need a coil, an iron core, and the like as used in a conventional transformer.


Patent
Yamanashi University, Sintokogio Ltd. and Toyohashi University of Technology | Date: 2016-03-02

[Problem to be solved] To provide a pouring control method, for a ladle-tilting automatic pouring device, where the operation for identification of the parameters, which normally takes much time to complete, can take less time and the device can pour with a high degree of precision by sequentially updating pouring model parameters according to the pouring situation. [Solution] The present method is a pouring control method for controlling pouring based on a mathematical model of a pouring process from input of control parameters to pouring of molten metal using a pouring ladle in an automatic pouring device with a tilting-type pouring ladle that pours the molten metal into a mold by tilting the pouring ladle that holds the molten metal, and the method comprises: identifying, using an optimization technique, a flow rate coefficient, a liquid density, and a pouring start angle that is a tilting angle of the pouring ladle at which flowing out of the molten metal starts, wherein the flow rate coefficient, the liquid density, and the pouring start angle are the control parameters in the mathematical model, based on weight of liquid that flows out of the pouring ladle and tilting angle of the ladle that are measured during pouring, and a command signal that controls the tilting of the pouring ladle, and updating the control parameters to the identified control parameters.

Loading Toyohashi University of Technology collaborators
Loading Toyohashi University of Technology collaborators