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Kojima, Takahiko,Inui, Yuji,Miyazaki, Soushi,Shiro, Motoo,Fukuzumi, Shunichi Royal Society of Chemistry 2009 Chemical communications Vol.2009 No.43
<P>A novel tetranuclear Ir(<SMALL>III</SMALL>) complex involving unprecedented coordination modes of alloxazine formed a closed π-space by intermolecular hydrogen bonding and the counter anions encapsulated in the space could be exchanged <I>via</I> self-assembly.</P> <P>Graphic Abstract</P><P>A novel tetranuclear Ir(<SMALL>III</SMALL>) complex involving unprecedented coordination modes of alloxazine formed a closed π-space by intermolecular hydrogen bonding; counter anions encapsulated in the space could be exchanged <I>via</I> self-assembly. <IMG SRC='http://pubs.rsc.org/services/images/RSCpubs.ePlatform.Service.FreeContent.ImageService.svc/ImageService/image/GA?id=b911033j'> </P>
Inui, Yuji,Miyazaki, Soushi,Ohkubo, Kei,Fukuzumi, Shunichi,Kojima, Takahiko WILEY‐VCH Verlag 2012 Angewandte Chemie Vol.124 No.19
<P><B>Potentialkontrolle</B>: Ein Ru<SUP>II</SUP>‐gebundenes Pterin bildet durch Drei‐Punkt‐Erkennung ein stabiles Wasserstoffbrückenaddukt mit einem Guaninderivat. Eine große positive Verschiebung des Reduktionspotentials des Pterinliganden von bis zu +320 mV wird beobachtet (siehe Bild). Beim Thyminderivat tritt ein anderer Wasserstoffbrückenmodus auf. Die Regulation von Redoxpotentialen eines Pterin‐Coenzyms durch nichtkovalente Wechselwirkungen wird demonstriert.</P>
PERFORMANCE INVESTIGATION OF ADSORPTION–COMPRESSION HYBRID REFRIGERATION SYSTEMS
KUTUB UDDIN,TAKAHIKO MIYAZAKI,SHIGERU KOYAMA,BIDYUT BARAN SAHA 대한설비공학회 2013 International Journal of Air-Conditioning and Refr Vol.21 No.4
An analytical investigation on the performance of adsorption–compression hybrid refrigeration systems with two different cycle con¯gurations, cascade type and subcool type has been performed. In the former type, a cascade condenser is used which works as a condenser for mechanical compression cycle and evaporator for adsorption cycle. In the latter type, an evaporative subcooler is used which subcool the °uid of mechanical compression cycle. The refrigerants examined for the mechanical compression cycle are R134a, R152a, R1234yf and R1234ze whereas ethanol is the refrigerant for the adsorption cycle. The main feature of the proposed system is the capability to signi¯cantly reduce work input for the mechanical compressor which results up to 30% energy saving potential depending on the selection of refrigerant and system con¯guration. Based on the thermodynamic properties and laws the study analyzed the effect of the major design parameters such as evaporation temperature, compressor discharge pressure and desorption temperature on the system performances.
Lao Marco,Lin Jie,Mikšík František,Thu Kyaw,Miyazaki Takahiko 대한설비공학회 2022 International Journal of Air-Conditioning and Refr Vol.30 No.1
Thermally driven desiccant- and evaporative cooling-based technologies are promising greener and cheaper alternatives to compressor-based systems due to the separate handling of latent and sensible loads. Desiccant air-conditioning (DAC) systems comprise a desiccant dehumidifier, a sensible cooling unit, a heat source for regeneration, and a heat recovery unit. These components of a DAC system can be arranged in various ways to give different configurations with varying advantages and disadvantages. In this study, five configurations of thermally driven desiccant dehumidifier- and dew point evaporative cooling (DPEC)-based DAC systems were investigated. Seven evaluation criteria namely regeneration temperature, desiccant moisture removal capacity, COPt, DPEC L/H, heat exchanger UA, system size, and fan power requirement were employed. Results show that the standard cycle in ventilation mode offers the highest COPt despite having the highest regeneration temperature. Recirculation of the return room air can operate at a significantly lower regeneration temperature at the expense of larger equipment size and much lower COPt. DAC with an internally cooled dehumidification can operate at low regeneration temperature at the expense of higher fan power and slightly lower COPt. Dividing the dehumidification process into two stages can offer operation at moderately lower regeneration temperature without severely affecting the other criteria. This study can serve as a guide for the selection of an appropriate DAC configuration for space cooling depending on the objective criteria and the resources available.