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RISS 인기검색어
- 검색키워드
- 저자 : Thomas Gries (검색결과 4 건)
- 무료
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- 유료
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Employment Effects of International Factor Mobility: A Theoretical Approach with Heterogenous Labor
( Thomas Gries ),( Stefan Jungblut ) 세종대학교 경제통합연구소 (구 세종대학교 국제경제연구소) 2007 Journal of Economic Integration Vol.22 No.2
In many countries the difference in labor market performance for skilled and unskilled workers has increased over the past decades. While an extended literature exists on the employment effects of trade, less is known about the effects of factor mobility. Based on the “labor market flow approach”, we develop a model of persistent structural unemployment for skilled and unskilled workers. Within this model the effects of capital mobility and migration are analyzed. Given that real and human capital are complements we find that skilled and unskilled worker will both gain from capital inflows. Within each labor market segment, the effects of labor inflows is always negative. The cross effects of labor infows, however, are non-symmetrical: On the one hand, an inflow of unskilled labor negatively affects the unskilled segment, but will not affect the unemployment rate of skilled workers. On the other hand, an inflow of skilled labor will always negatively affect the unemployment rate in both segments of the labor market. If policy makers would like to avoid these effect, the number of unskilled must simultaneously be decreased, the rate of internal real capital accumulation must be increased or real and human capital must be imported as a bundle.
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Project Life INSUSHELL: Reducing the Carbon Footprint in Concrete Construction
Tomoscheit, Silke,Gries, Thomas,Horstmann, Michael,Hegger, Josef Sustainable Building Research Center 2011 International journal of sustainable building tech Vol.2 No.2
Within the Life INSU-SHELL project (Environmentally Friendly fa$\c{c}$ade Elements made of thermal insulated Textile Reinforced Concrete) RWTH Aachen University together with industrial partners developed and implemented an innovative and eco friendly modular system for sandwich fa$\c{c}$ades. The thin-walled, light-weight sandwich structure combines Textile Reinforced Concrete (TRC) and a PUR-rigid-foam-insulation. With the use of TRC a large quantity of concrete material and therefore $CO_2$-output can be avoided. The lower amount of concrete used in the new elements results in a reduction of $CO_2$-output of about 70% in comparison to a similar element of ferroconcrete. The lower weight saves energy and fuel. Moreover it reduces the pollutant emission in transport and application. The employment of the innovative elements at the new INNOTEX building (ITA: Institut fuer Textiltechnik of RWTH Aachen University) with a fa$\c{c}$ade size of about $590\;m^2$ saved large quantities of $CO_2$-output in comparison to conventional building techniques.
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Yoo, Doo-Yeol,Gohil, Udityasinh,Gries, Thomas,Yoon, Young-Soo SAGE Publications 2016 Journal of composite materials Vol.50 No.17
<P>In this study, the effect of the textile reinforcement type on the flexural response of textile-reinforced concrete beams under static and impact loads was investigated. In addition, to compare the flexural capacities with those of conventional steel-fiber-reinforced concrete, steel-fiber-reinforced concrete beams having similar compressive strength with that of textile-reinforced concrete were fabricated and tested according to the fiber content. Enhancements in the flexural capacities were obtained using polymer-coated textile reinforcement, and three-dimensional textile reinforcement resulted in slightly better flexural performance than two-dimensional textile reinforcement under both static and impact loads. Upon comparison with the results obtained from the steel-fiber-reinforced concrete beams, the textile-reinforced concrete specimen with polymer-coated textile reinforcement exhibited the best flexural performance in terms of the strength, toughness, and residual load carrying capacity (higher than or at least similar to those of the steel-fiber-reinforced concrete with a fiber volume content of 2%), whereas the textile-reinforced concrete specimens with uncoated textile reinforcement exhibited lower strength and toughness than those of the steel-fiber-reinforced concrete with a fiber volume content of 0.5%. Finally, the strain-rate sensitivity of the flexural strength for textile-reinforced concrete was found to be similar to that for steel-fiber-reinforced concrete.</P>
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Smart Stimuli-Responsive Polylactic Acid-Hydrogel Fibers Produced via Electrospinning
Danaja Štular,Magnus Kruse,Vera Župunski,Laura Kreinest,Jožef Medved,Thomas Gries,Andreas Blaeser,Ivan Jerman,Barbara Simončič,Brigita Tomšič 한국섬유공학회 2019 Fibers and polymers Vol.20 No.9
In this research we propose a new type of smart microfibers, distinguished by moisture management and proactivetemperature and pH controlled release activity. Hydrogel with submicron-sized particles based on poly(Nisopropylacrylamide)(poly-NiPAAm) and chitosan (PNCS hydrogel) was incorporated into the structure of poly(lactic acid)(PLA) microfibers using the electrospinning technique. Composites with different PLA to PNCS hydrogel ratios wereprepared, and the chemical and morphological properties of the samples were studied using SEM, FT-IR and Ramanmapping. Additionally, the moisture management properties, which were provided by the temperature and pH-related phasechange transition of the incorporated PNCS hydrogel, were studied by determining the temperature-related static contactangle, thin-layer wicking, moisture content and pH-related water uptake. The loading and release abilities of the incorporatedPNCS hydrogel were studied using fluorescent microscopy. The increased concentration of the PNCS hydrogel in spinningsolutions resulted in greater variations in fiber thickness and deterioration of the mechanical properties of the fibers; thus, thehighest concentration of the PNCS hydrogel that could be incorporated within the fibers was found to be 20 % of the spinningmass. The composite sample showed temperature and pH responsiveness, a successful fluorescent-dye loading ability and itscontrolled release at predetermined conditions.
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