Durability of Photocatalytic Cement after Nitric Oxide-Wet-Dry Cycling

이보연,Kurtis, Kim berly E 한국건축시공학회 2014 한국건축시공학회지 Vol.14 No.4

Photocatalytic cement has been receiving attention due to its high oxidation power that reduces nitrogen oxide, thuscontributing to a clean atmospheric environment. However, there has not yet been a thorough investigation on theeffect of photocatalytic reactions on the durability of cementitious material, the parent material. In this study,photocatalytic cement samples were exposed to nitric oxide gas and UV along with cycles of wetting and drying tosimulate environmental conditions. The surface of samples was characterized mechanically, chemically, and visuallyduring the cycling. The results indicate that that the photocatalytic efficiency decreased with continued NO oxidation. The pits found from SEM indicated that chemical deterioration, such as acid attack or leaching, did occur. However,this was not confirmed by X-ray diffraction. The hardness was not affected, probably due to the formation of CSH asevidenced by the XRD pattern. In conclusion, it was found that photocatalysis could alter cementitious materials bothchemically and mechanically, which could further affect long-term durability.

고 에너지 효율 제습 방법

John Dieckman,Kurtis McKenney,James Brocrick,박창용 (번역자) 대한설비공학회 2009 설비저널 Vol.38 No.9

Roof tile frangibility and puncture of metal window shutters

Sylvia T. Laboy-Rodriguez,Kurtis R. Gurley,Daniel Smith,Forrest J. Masters 한국풍공학회 2013 한국풍공학회지 Vol.17 No.2

The goal of this study was to investigate the vulnerability of roof tile systems and metal shutters to roof tile debris. Three phases addressed the performance of tile roof systems and metal shutters impacted by roof tile debris. The first phase experimentally evaluated the tile fragment size and quantity generated by a tile striking a tile roof system. The second phase experimentally quantified the puncture vulnerability of common metal panel shutter systems as a function of tile fragment impact speed. The third phase provided context for interpretation of the experimental results through the use of a tile trajectory model. The results provide supporting evidence that while metal panel window shutters provide significant protection against a prevalent form of windborne debris, these systems are vulnerable to tile fragment puncture in design level tropical cyclones. These findings correlate with field observations made after Hurricane Charley (2004).

Roof tile frangibility and puncture of metal window shutters

Laboy-Rodriguez, Sylvia T.,Smith, Daniel,Gurley, Kurtis R.,Masters, Forrest J. Techno-Press 2013 Wind and Structures, An International Journal (WAS Vol.17 No.2

The goal of this study was to investigate the vulnerability of roof tile systems and metal shutters to roof tile debris. Three phases addressed the performance of tile roof systems and metal shutters impacted by roof tile debris. The first phase experimentally evaluated the tile fragment size and quantity generated by a tile striking a tile roof system. The second phase experimentally quantified the puncture vulnerability of common metal panel shutter systems as a function of tile fragment impact speed. The third phase provided context for interpretation of the experimental results through the use of a tile trajectory model. The results provide supporting evidence that while metal panel window shutters provide significant protection against a prevalent form of windborne debris, these systems are vulnerable to tile fragment puncture in design level tropical cyclones. These findings correlate with field observations made after Hurricane Charley (2004).

Sustainable Development and Energy Geotechnology− Potential Roles for Geotechnical Engineering

R. J. Fragaszy,산타마리나,A. Amekudzi,D. Assimaki,R. Bachus,S. E. Burns,M. Cha,조계춘,D. D. Cortes,S. Dai,D. N. Espinoza,L. Garrow,H. Huang,J. Jang,J. W. Jung,S. Kim,K. Kurtis,이창호,C. Pasten,H. Phadnis,G. Rix 대한토목학회 2011 KSCE Journal of Civil Engineering Vol.15 No.4

The world is facing unprecedented challenges related to energy resources, global climate change, material use, and waste generation. Failure to address these challenges will inhibit the growth of the developing world and will negatively impact the standard of living and security of future generations in all nations. The solutions to these challenges will require multidisciplinary research across the social and physical sciences and engineering. Although perhaps not always recognized, geotechnical engineering expertise is critical to the solution of many energy and sustainability-related problems. Hence, geotechnical engineers and academicians have opportunity and responsibility to contribute to the solution of these worldwide problems. Research will need to be extended to non-standard issues such as thermal properties of soils; sediment and rock response to extreme conditions and at very long time scales; coupled hydro-chemo-thermo-bio-mechanical processes; positive feedback systems; the development of discontinuities; biological modification of soil properties; spatial variability; and emergent phenomena. Clearly, the challenges facing geotechnical engineering in the future will require a much broader knowledge base than our traditional educational programs provide. The geotechnical engineering curricula, from undergraduate education through continuing professional education, must address the changing needs of a profession that will increasingly be engaged in alternative/renewable energy production; energy efficiency; sustainable design, enhanced and more efficient use of natural resources, waste management, and underground utilization.

Comparative analysis of antibody responses to BNT162b2, ChAdOx1, and CoronaVac vaccines in the Albanian population over the pandemic years 2021 to 2022

Sulcebe Genc,Kurti-Prifti Margarita,Shyti Erkena,Dashi-Pasholli Jonida,Cenko Fabian,Ylli Alban 대한백신학회 2024 Clinical and Experimental Vaccine Research Vol.13 No.1

This repeated cross-sectional study with two independent sample populations compared the antibody response to severe acute respiratory syndrome coronavirus 2 vaccines in Albania in July–August 2021 and 2022. In 2021, it found higher anti-spike-1 seropositivity and antibody levels in fully vaccinated individuals, especially with BNT162b2 and ChAdOx1 and to a lesser degree with CoronaVac. By 2022, all single-dose recipients showed high antibody responses, suggesting natural infection-enhanced immunity. The study indicates a significant evolution in the antibody response to different coronavirus disease 2019 vaccines and suggests that a single vaccine dose, coupled with natural infection, might suffice to maintain adequate immunity levels in an endemic scenario.

The strategy and potential utilization of temperate germplasm for the improvement of tropical germplasm: genetic diversification program is a GEM (germplasm enhancement of maize) of a resource for(Zea mays L.) growers in USA

Sun-Hee Woo,Tea-Young Oh,Hee-Young Jang,Jung-Hee Ko,Seong-Bum Baek,Young-Up Kwon,Matthew Krakowsky,Major Goodman,Peter J. Balint-Kurti,James B. Holland,Yoon-Sup So 한국육종학회 2013 한국육종학회 심포지엄 Vol.2013 No.07

In U.S.A. maize breeding, exotic germplasm is considered as high-risk and usually introduced by backcrossing specific traits into elite lines. The U.S.A. maize germplasm base is narrow. Only a few open-pollinated varieties are well represented in current programs. Currently, the barrier in using of exotic germplasm in the U.S.A is less formidable than in the 1980s. The major reason is that U.S.A materials are now used in tropical breeding to accelerate earlier maturity and lodging resistance. These exotic materials, developed with U.S.A germplasm, are being introduced back into the U.S.A.Since1994, the ARS-led Germplasm Enhancement of Maize (GEM) project has sought to help broaden the genetic base of America’s corn crop by promising exotic germplasm and crossing it with domestic lines. New hybrids derived from such crosses have provided corn researchers and the producers. These may include improved or alternative native source of resistance to insect pests such as corn rootworms and diseases like northern leaf blight. GEM’s aim is to provide source of useful genetic maize diversity to help the producers to reduce risks from new or evolving insect and disease threats or changes in the environment or respond to new marketing opportunities and demand. During the 2009 growing season, the Ames (Iowa) and Raleigh (North Carolina) locations managed or coordinated evaluations on 17,200 nursery plots as well as 14,000 yield trial plots in Ames and 12,000 in Raleigh. A new “allelicdiversity” study is devoted to exploring and capturing the genetic variation represented by over 300 exotic corn races. Since 2001, GEM has released 221 new corn lines to cooperators for further development into elite commercial new hybrids. GEM has already identified about 50%-tropical, 50%-temperate families tracing primarily to tropical hybrids that are competitive with commercial checks. In North Carolina State University program, they have examined the potential of tropical inbredand hybrids for U.S.A. breeding by crossing temperate-adapted, 100%-tropical lines to U.S.A hybrids. There should be favorably unique alleles or genomic regions in temperate germplasm that can be helpful in tropical maize improvement as well as utilization of tropical lines in temperate areas.