http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
Study of the most frequent natural tooth colors in the Spanish population using spectrophotometry
Gomez-Polo, Cristina,Gomez-Polo, Miguel,Martinez Vazquez de Parga, Juan Antonio,Celemin Vinuela, Alicia The Korean Academy of Prosthodonitics 2015 The Journal of Advanced Prosthodontics Vol.7 No.6
PURPOSE. To identify the most frequent natural tooth colors using the Easyshade Compact (Vita -Zahnfabrik) spectrophotometer on a sample of the Spanish population according to the 3D Master System. MATERIALS AND METHODS. The middle third of the facial surface of natural maxillary central incisors was measured with an Easyshade Compact spectrophotometer (Vita Zahnfabrik) in 1361 Caucasian Spanish participants aged between 16 and 89 years. Natural tooth color was recorded using the 3D Master System nomenclature. The program used for the present descriptive statistical analysis of the results was SAS 9.1.3. RESULTS. The results show that the most frequent dental color in the total sample studied is 3M1 (7.05%), followed by the intermediate shade 1M1.5 (6.91%) and 2L1.5 (6.02%). CONCLUSION. According to the research methodology used, and taking into account the limitations of this study, it can be proposed that the most frequent color among the Spanish population is 3M1; the most common lightness group is 2; the most frequent hue group according to the 3D Master System is M and the most frequent chroma group is 1.5.
Anti-Helicobacter pylori Potential of Three Edible Plants Known as Quelites in Mexico
Erika Gomez-Chang,Guadalupe Vanessa Uribe-Estanislao,Maricruz Martinez-Martinez,Amanda Galvez-Mariscal,Irma Romero 한국식품영양과학회 2018 Journal of medicinal food Vol.21 No.11
“Quelites” are edible plants that are part of the traditional agro-ecosystems in Mexico. These plants, despite their already known nutritional properties, are now considered neglected and underutilized species. With the objective of promoting their reinsertion in the markets and mainly, in daily diets, efforts have been made to study them from multidisciplinary approaches to demonstrate their beneficial properties. To generate evidence of an added health-promoting value that would encourage quelites consumption, in the present work, the anti-Helicobacter pylori activity of three representative quelite species, Anoda cristata (Alache), Cnidoscolus aconitifolius (Chaya), and Crotalaria pumila (Chepil), was tested. H. pylori is considered the etiological agent of gastritis, ulcer, and gastric cancer, and represents a public health problem in Mexico and worldwide. Aqueous (AQ) and dichloromethane–methanol (DM) extracts were obtained from the three species of quelites to investigate their effect on H. pylori growth and on two of its colonization factors (adherence and urease activity). DM extracts from Chaya, Chepil, and Alache exert the best inhibitory effect on bacterial growth, with minimum inhibitory concentrations of 62.5, 125, and 250 μg/mL, respectively. AQ and DM extracts inhibit bacterial adhesion by 30% to 50%. None of them has an effect on urease activity. The two flavonoids present in A. cristata, acacetin and diosmetin, inhibit H. pylori growth by ∼90% with 3.9 μg/mL. These results provide new information about the anti-H. pylori potential of three edible quelites, and give an added value, since their routine consumption may impact on the prevention and/or control of H. pylori-associated diseases.
Optimal Dispatch Model for Demand Response Aggregators
Victor J. Gutierrez-Martinez,Enrique A. Zamora-Cardenas,Alejandro Pizano-Martinez,Jose M. Lozano-Garcia,Miguel A. Gomez-Martinez 대한전기학회 2019 Journal of Electrical Engineering & Technology Vol.14 No.1
This paper proposes a new three-phase optimal dispatch model for multiple Demand Response (DR) aggregators. By means of the unbalanced distribution system modeling, DR involvement of single- and three-phase consumers is considered avoiding aggravating the asymmetric balancing between phases, as opposed to traditional positive-sequence DR approaches. Furthermore, this proposal can consider several DR service providers by means of the explicit inclusion of their characteristics, in the form of cost functions and capacity, in an optimal dispatch model for DR support at the distribution system level. Hence, this proposal helps to eliminate any possible uncertainty about the provision of DR services by improving the traditional hierarchical scheme adopted based on prices issued by the Independent System Operator (ISO). The model is implemented and solved combining the two state-of-the-art computational tools, Matlab® and OpenDSS. The former is used to solve the optimization problem, whereas the latter is used to perform numerical simulations of three-phase unbalanced power flow; both tools allow a straightforward model implementation resulting in a tool easily modified and updated. The effectiveness of the proposed approach is numerically demonstrated using the IEEE 13- and 123-node test feeders, in which undesirable operating scenarios are corrected by the implementation of the optimal dispatch of DR resources in very short computational times. Based on the results, it is shown how the ISO is capable to request DR considering several aggregators competing at the distribution system level. Finally, the loss reduction has been included in the objective function, showing that the proposal optimally dispatches the DR aggregators to conveniently minimize the ISO’s operational costs.
Monte Carlo Simulations for the Study of a Moderated Neutron Detector
M. B. Gomez Hornillos,V. Gorlychev,R. Caballero,G. Cortes,A. Poch,C. Pretel,F. Calvino,J. L. Tain,A. Algora,J. Agramunt,D. Cano-Ott,T. Martinez,E. Mendoza,J. Rissanen,J. Aysto,A. Jokinen,T. Eronen,I. 한국물리학회 2011 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.59 No.23
This work presents the Monte Carlo simulations performed with the MCNPX and GEANT4 codes for the design of a BEta deLayEd Neutron detector, BELEN-20. This detector will be used for the study of beta delayed neutron emission and consists of a block of polyethylene with dimensions 90 × 90 × 80 cm ^3 and 20 cylindrical ^3He gas counters. The results of these simulations have been validated experimentally with a ^(252)Cf source in the laboratory at UPC, Barcelona. Also the first experiment with this detector has been carried out in November 2009 in JYFL, Finland. In this experiment the neutron emission probability after beta decay of the fission products ^(88)Br, ^(94,95)Rb and ^(138)I has been measured; this data is still under analysis. Simulations with MCNPX and GEANT4 have been performed in order to obtain the efficiency of the BELEN-20 detector for each of the above nuclei using the neutron energy distribution corresponding to each nucleus.
Fuzzy Logic Controller for Boost Converter with Active Power Factor Correction
Fredy H. Martinez S,Diego F. Gomez M 전력전자학회 2007 ICPE(ISPE)논문집 Vol.- No.-
This paper presents the successful use of fuzzy logic to derive a practical control scheme for boost converter with active power factor correction. Aspects of sudden changes in the load and the input voltage are discussed and presented. The fundamentals governing the design, control and performance are also illustrated. Properties of the proposed controller are: (1) converter with active power factor correction, (2) good performance of transient responses under varying loading conditions and/or input voltage, and (3) robustness around the operating point.
Establishment of the Latin American Soil Information System Case Colombia - IRAKA
Araujo-Carrillo Gustavo Alfons,Martinez-Maldonado Fabio Ernes,Varon-Ramirez Viviana Marcela,Gomez-Latorre Douglas Andres,Estupinan-Casallas Jhon Mauric,Silva-Arero Elias Alexander,Gonzalez-Jaimes Edua 한국토양비료학회 2019 한국토양비료학회 학술발표회 초록집 Vol.2019 No.8
Synthesis of gold nanoparticles using Coffea Arabica fruit extract
Bogireddy, Naveen Kumar Reddy,Gomez, L. Martinez,Osorio-Roman, I.,Agarwal, V. Techno-Press 2017 Advances in nano research Vol.5 No.3
We report a simple eco-friendly process for the synthesis of gold nanoparticles (AuNPs) using aqueous extract from Coffea Arabica fruit. The formation of AuNPs was confirmed using absorption spectroscopy and scanning electron microscopy images. FT-IR analysis demonstrates the major functional groups present in Coffee Arabica fruit extract before and after synthesizing AuNPs. The Face Center Cubic (FCC) polycrystalline nature of these particles was identified by X-Ray diffraction (XRD) analysis. Taking into account the contribution of the biomass surrounding the AuNPs, dynamic light scattering (DLS) results revealed an average particle size of ~59 nm.