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강우유출수 모래 필터의 여과기능 및 폐색 현상에 대한 필터 여재 깊이의 영향 평가
( Ezequiel Q. Segismundo ),이병식 ( Byung Sik Lee ),김이형 ( Lee Hyung Kim ),구본홍 ( Bon Hong Koo ) 한국물환경학회 2016 한국물환경학회지 Vol.32 No.1
Sand filters are widely used in infiltration systems to manage polluted urban runoff. Clogging, which is mainly caused by the deposition of sediments on the filter media, reduces the filter system’s infiltration capacity, which further limits its lifespan and function. The physical, chemical and biological clogging characteristics of sand filter, therefore, need to be known for effective design and maintenance. Physical clogging behavior and variations in the characteristics of sand filters according to different media depths are examined in this paper. The variations were observed from laboratory column infiltration tests conducted in a vertical flow and fluctuating head condition. It can be seen that an increase in filter media depth results in a high sediment removal performance; however, it leads to a shorter lifespan due to clogging. In the choice of filter media depth to be used in field applications, therefore, the purpose of facilities as well as maintenance costs need to be considered. At all filter media depth configurations, premature clogging occurred because sediments of 100~250 μm clogged the top 15% of filter media depth. Thus, scrapping the top 15% of filter media may be suggested as the first operational maintenance process for the infiltration system.
Ezequiel Q. Segismundo,Marla C. Maniquiz-Redillas,Lee Hyung Kim,Byung Sik Lee 한국방재학회 2015 한국방재학회 학술발표대회논문집 Vol.14 No.-
Clogging of the filter media which is brought by physical, chemical, and biological factors tend to reduce the lifespan of filters and remains a challenge. In this study, a laboratory column test method was used to investigate the evolution of physical and biological clogging in a non-vegetated filter media system with layers of sand, gravel, and woodchip. Blank column tests using either sand or gravel were conducted and investigated. Several column setups with varying arrangements and particle sizes of sand and gravel were also prepared to identify the best filter media combination that is least susceptible to clogging without compromising the treatment capacity. Artificial stormwater runoff was introduced in the system at a specific hydraulic loading rate (HLR) and influent characteristics. The degree of clogging was quantified by monitoring the variations in the hydraulic head at different levels of the columns. Water samples were also collected, tested, and analyzed at the end of each test run in order to measure the treatment efficiency of the filter. The insights and results of this study can justify the physical and biological clogging formation in filter media and therefore be used to suggest some filter media particle size modifications that can help to improve the sediment removal and treatment performance. Moreover, it can also aid to reduce the maintenance frequency and costs of a stormwater filter system.
Memantine Reverses Social Withdrawal Induced by Ketamine in Rats
Ezequiel Uribe,José Landaeta,Richard Wix,Antonio Eblen 한국뇌신경과학회 2013 Experimental Neurobiology Vol.22 No.1
The objective of this study was to determine the effect of memantine on schizophrenia-like symptoms in a ketamine-induced social withdrawal model in rats. We examined therapeutic effects of memantine, an NMDA antagonist, and haloperidol, a classic antipsychotic drug, on this behavioral model. Administration of memantine (10 or 15 mgㆍkg-1) significantly reduced ketamine-induced social withdrawal, and this effect was more effective than that of haloperidol (0.25 mgㆍkg-1) by restoring the social interaction between rats with no modification in general motor activity. These results suggest that memantine could have a therapeutic potential for schizophrenia.
Antiproliferative Effect from the Mexican Poleo (Hedeoma drummondii)
Ezequiel Viveros-Valdez,Catalina Rivas-Morales,Azucena Oranday-Cardenas,Jorge Castro-Garza,Pilar Carranza-Rosales 한국식품영양과학회 2010 Journal of medicinal food Vol.13 No.3
Hedeoma drummondii (poleo) has been used by Mexicans to prepare a tea for its pleasant taste. The methanolic extract, polar fractions, and major antioxidant compounds of the Mexican herbal tea obtained from aerial parts of H. drummondii (“poleo”) showed antiproliferative effects against the cancer cell lines MCF-7 (human breast) and HeLa (human cervix). Phenolic acids isolated from poleo have significant antiproliferative effects with caffeic acid the most potent. This evidence suggests that herbal poleo tea may have chemopreventive properties.
Evaluation of Shear Modulus of Sand Using Earthquake Records in Dynamic Centrifuge Tests
Segismundo Ezequiel Q,이병식,김남경,추연욱 한국방재학회 2014 한국방재학회논문집 Vol.14 No.3
Evaluation of the shear modulus of soil is of great importance in understanding both the fundamental soil behavior and its practical application in dynamic geotechnical problems as well as accurate analysis of seismic response of soil deposit and soil-structure interaction. There are traditionally several available techniques in measuring shear modulus of soil using laboratory tests. In this paper, calculation methods to evaluate shear modulus were reviewed from previously published works. A simple procedure was established using the previous equations. This procedure successfully obtained shear modulus of a sand deposit used for dynamic centrifuge tests. It also captured non-linear shear modulus with shear strain and effect of confining pressure. The shear modulus and normalized shear modulus versus shear strain curves from the experiment are compared with empirical curves proposed in literature. The shear modulus curves from the centrifuge tests are in reasonable agreement with the previous curves.
강우유출수 처리시설 침투특성에 대한 필터여재 파쇄의 영향
Segismundo Ezequiel Q,구본홍,김이형,이병식 한국지반공학회 2016 한국지반공학회논문집 Vol.32 No.2
For sand and zeolite filter media in stormwater BMPs, media breakage effects on infiltration were investigated. Compaction effort and infiltration force were mainly examined for breakage sources. The 1-D column infiltrationtests for un-compacted and compacted media filters were conducted to investigate the breakage effect on infiltration. As a result, the following findings were deduced: 1) particle breakage due to filtration forces was found to berelatively minimal; 2) un-compacted media had lesser amount of crushed particles and permeability fluctuationscompared to compacted media; 3) even without the presence of suspended solids in the influent, reduction inpermeability was found, which resulted from rearrangement and re-entrainment of media particle itself; 4) only mediaparticle breakage resistance is considered, sand was revealed to have better performance compared to zeolite media.
de la Llave, Ezequiel,Borgel, Valentina,Park, Kang-Joon,Hwang, Jang-Yeon,Sun, Yang-Kook,Hartmann, Pascal,Chesneau, Frederick- Francois,Aurbach, Doron American Chemical Society 2016 ACS APPLIED MATERIALS & INTERFACES Vol.8 No.3
<P>The electrochemical behavior of Na-ion and Li-ion full cells was investigated, using hard carbon as the anode material, and NaNi0.5Mn0.5O2 and LiNi0.5Mn0.5O2 as the cathodes. A detailed description of the structure, phase transition, electrochemical behavior and kinetics of the NaNi0.5Mn0.5O2 cathodes is presented, including interesting comparison with their lithium analogue. The critical effect of the hard carbon anodes pretreatment in the total capacity and stability of full cells is clearly demonstrated. Using impedance spectroscopy in three electrodes cells, we show that the full cell impedance is dominated by the contribution of the cathode side. We discuss possible reasons for capacity fading of these systems, its connection to the cathode structure and relevant surface phenomena.</P>
( Viviana Dalamon ),( Ezequiel Surace ),( Florencia Giliberto ),( Veronica Ferreiro ),( Cecilia Fernandez ),( Irene Szijan ) 생화학분자생물학회 2004 BMB Reports Vol.37 No.2
Constitutional RB1 gene mutations were studied in a series of 21 families with unilateral and bilateral retinoblastoma patients. Peripheral blood lymphocytes were analyzed by exon by exon PCR-heteroduplex and sequencing. Mutations were identified in 6 (29%) of the patients. One mutation corresponded to an intronic polymorphism in g.174351T>A. The other five mutations resulted C to T exonic transitions, four were CGA sequences (g.65386, g.150037 in two patients, and g.162237), creating stop codons and presumably truncated proteins. The fifth one was new and resulted in alanine to valine substitution (g.73774). Two patients had the same the germline truncated mutation (g.150037C>T), one with a familial bilateral early onset retinoblastoma and one with a sporadic unilateral late onset retinoblastoma. The later type has not been previously described. This finding is discussed in the genotype/phenotype correlation context. Additionally, a single nucleotide change was found in six studied samples, where a C to T homozygous transversion was identified in intron 26(IVS26+28). It is worthy the non concordance of the nucleotide with the published sequence, This analysis proved to be a useful method for the detection of mutations in the RB1 gene, and contributed to the adequate genetic counseling to patients and relatives.
Juvenile and Mature Pinewoods Treated by in situ Polymerization with Poly(vinyl acetate)
Andrey Acosta,Ezequiel GALLIO,Paula Zanatta,Henrique Schulz,Rafael de Avila Delucis,Darci Gatto 한국섬유공학회 2021 Fibers and polymers Vol.22 No.3
This study aims to produce and characterize wood-based composites (WPC) by in situ polymerization withpoly(vinyl acetate) into juvenile and mature woods from a pine specie. Vacuum-pressure method was used to impregnate thewood with a vinyl acetate monomer and benzoyl peroxide (1.5 wt%) was used as initiator. The studied WPC werecharacterized for treatment parameters (weight percentage gain and specific gravity), as well as chemical (by infraredspectroscopy), thermal (by thermogravimetric analysis) and mechanical (by flexure and hardness tests) features. The in situpolymerization yielded improved mechanical properties and increased thermal stabilities, which were attributed to theimpregnated poly(vinyl acetate) (especially on the wood surface) as suggested by treatment parameters and infrared spectra. The presented wood treatment may be a key strategy to improve pinewood properties, especially from juvenile wood, whichmay overcome the properties of the pristine mature wood.
Paulina Marchant,Ezequiel Hidalgo-Hermoso,Karen Espinoza,Patricio Retamal 대한수의학회 2016 Journal of Veterinary Science Vol.17 No.4
Salmonella (S.) enterica and Shiga toxin-producing Escherichia coli (STEC) are foodborne pathogens. Here, we report the prevalence of S. enterica and STEC in feces of 316 zoo animals belonging to 61 species from Chile. S. enterica and STEC strains were detected in 7.5% and4.4% of animals, respectively. All Salmonella isolates corresponded to the serotype Enteritidis. To the best of our knowledge, this is the firstreport of S. Enteritidis in the culpeo fox (Lycalopex culpaeus), black-capped capuchin (Sapajus apella) and Peruvian pelican (Pelecanusthagus) and the first STEC report in Thomson's gazelle (Eudorcas thomsonii).