http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
Daisy Pérez-Brito,Anuar Magaña-Alvarez,Patricia Lappe-Oliveras,Alberto Cortes-Velazquez,Claudia Torres-Calzada,Teófilo Herrera- Suarez,Alfonso Larqué-Saavedra,Raul Tapia-Tussell 한국미생물학회 2015 The journal of microbiology Vol.53 No.1
This study characterized Clavispora lusitaniae strains isolatedfrom different stages of the processing and early fermentationof a henequen (Agave fourcroydes) spirit produced inYucatan, Mexico using a molecular technique. Sixteen strainsidentified based on morphological features, obtained fromdifferent substrates, were typed molecularly. Nine differentversions of the divergent D1/D2 domain of the large-subunitribosomal DNA sequence were identified among theC. lusitaniae strains. The greatest degree of polymorphismwas found in the 90-bp structural motif of the D2 domain. The MSP-PCR technique was able to differentiate 100% ofthe isolates. This study provides significant insight into thegenetic diversity of the mycobiota present during the henequenfermentation process, especially that of C. lusitaniae,for which only a few studies in plants have been published. The applied MSP-PCR markers were very efficient in revealingpolymorphisms between isolates of this species.
Photo-catalysis of phenol derivatives with Fe2O3 nanoparticles dispersed on SBA-15
E. Montiel-Palacios,A. K. Medina-Mendoza,A. Sampieri,C. Angeles-Chávez,I. Hernández-Pérez,R. Suarez-Parra 한양대학교 세라믹연구소 2009 Journal of Ceramic Processing Research Vol.10 No.4
Highly ordered hexagonal (p6mm) mesoporous silica SBA-15 was synthesized through a hydrothermal treatment under acidic conditions. Fe2O3/SBA-15 catalysts were prepared by impregnation of SBA-15 media with iron(III) acetylacetonate, iron(III) chloride or iron(II) sulfate solutions. X-ray Diffraction (XRD), X-ray fluorescence (XRF), high angle annular dark field scanning transmission electron microscopy (HAADF-STEM), energy dispersive X-ray (EDX) spectroscopy and nitrogen physisorption characterization were carried out for SBA-15 and Fe2O3/SBA-15 materials. After impregnation and calcination at 823 K, the iron oxide dispersion in SBA-15 was analyzed by STEM and EDX. FeCl3 provides the highest amount of Fe loading in mesoporous SBA-15. The photocatalytic properties of Fe2O3/SBA-15 samples at pH = 3 and pH = 6 were evaluated in catechol and hydroquinone photodecomposition by inducing visible radiation. The conversion of catechol and hydroquinone, at pH = 3 and pH = 6 with iron(III) acetylacetonate and FeCl3 as the precursor of iron oxide nanoparticles, were measured by UV-Vis spectroscopy, chemical oxygen demand (COD) and total organic carbon (TOC) analysis. Highly ordered hexagonal (p6mm) mesoporous silica SBA-15 was synthesized through a hydrothermal treatment under acidic conditions. Fe2O3/SBA-15 catalysts were prepared by impregnation of SBA-15 media with iron(III) acetylacetonate, iron(III) chloride or iron(II) sulfate solutions. X-ray Diffraction (XRD), X-ray fluorescence (XRF), high angle annular dark field scanning transmission electron microscopy (HAADF-STEM), energy dispersive X-ray (EDX) spectroscopy and nitrogen physisorption characterization were carried out for SBA-15 and Fe2O3/SBA-15 materials. After impregnation and calcination at 823 K, the iron oxide dispersion in SBA-15 was analyzed by STEM and EDX. FeCl3 provides the highest amount of Fe loading in mesoporous SBA-15. The photocatalytic properties of Fe2O3/SBA-15 samples at pH = 3 and pH = 6 were evaluated in catechol and hydroquinone photodecomposition by inducing visible radiation. The conversion of catechol and hydroquinone, at pH = 3 and pH = 6 with iron(III) acetylacetonate and FeCl3 as the precursor of iron oxide nanoparticles, were measured by UV-Vis spectroscopy, chemical oxygen demand (COD) and total organic carbon (TOC) analysis.
Javier Arranz-Andrés,Inmaculada Suárez,Rosario Benavente,Ernesto Pérez 한국고분자학회 2011 Macromolecular Research Vol.19 No.4
Two series of ethylene-propylene copolymers were synthesized in the whole composition range using a metallocene catalyst, one in the homogeneous phase (H copolymers), and the other with the catalyst supported in silica (S copolymers). Some differences were found between the two groups. Therefore, the amount of ethylene needed to obtain a certain proportion of the γ form is lower in the H than in S series. Moreover, the composition to obtain the pseudo hexagonal form is also different for the two groups. On the other hand, degree of crystallinity, crystal sizes and microhardness values display a similar variations with the comonomer content of the two series. Consequently, from a macroscopic point of view, materials with similar macroscopic mechanical properties can be produced using both supported and homogeneous metallocene catalysts despite the structural differences.
Restoration and conservation of anatomic pieces
Camila Cárdenas Guerrero Guzmán,Karen Alejandra Pérez Díaz,María Paula Ruíz Díaz,Valentina Díaz Sánchez,Andrés Camilo Ariza Aguirre,Laura Catalina Cantor Alfonso,Camila Andrea Suárez Ortiz,Davide Fali 대한해부학회 2019 Anatomy & Cell Biology Vol.52 No.3
In this study, a restoration process was developed with potassium hydroxide (KOH), in order to improve each of the structures for their posterior fixation, through the use of new methods such as the Chilean conservative fixative solution (SFCCh), with exceptional results. Restore anatomical pieces corresponding to corpse and organs, being these last set with the SFCCh. In this work dealt with processes of restoration with potassium hydroxide, sodium chloride, and sodium hypochlorite, the process began with the cleanliness and suture of the structures for subsequent fixing in Chilean conservative fixative solution, making use of a corpse and different anatomical parts. Work based on items found in the database, Elsevier, Science Direct, ProQuest, and MEDLINE. At the end of the process of restoration and conservation of the anatomical pieces, was observed an improvement in muscle pigment with decrease of rigidity in the specimen, additionally a recovery of appearance in the vascular-nervous elements was achieved. The organs were much more malleable and the structures facilitate the identification of specific details, its subsequent immersion in SFCCh allows the longer preservation of the obtained results. The restoration with potassium hydroxide allows the improvement in the appearance of the different anatomical structures and simultaneously to facilitate its study. The SFCCh is an alternative that replaces partially the use of formaldehyde. In addition, it presents toxicity reduction.
Neuro-Fuzzy Modelling and Stable PD Controller for Angular Position in Steering Systems
Ramos-Fernández Julio C.,López-Morales Virgilio,Márquez-Vera Marco A.,Pérez Juan Manual Xicotencatl,Suarez-Cansino Joel 한국자동차공학회 2021 International journal of automotive technology Vol.22 No.6
The precision agriculture and soil tillage are tasks which can be achieved by Automated Tractors (AT) through the integration of several servomechanisms. In order to reach a high autonomy under various work conditions of the AT, control laws’ design and tuning are paramount. The aim of this work is to develop an angle position controller for steering systems applied to an AT. We introduce an automatic electronic steering system by using a fuzzy model, obtained through an Adaptive Neuro-Fuzzy Inference System (ANFIS) algorithm training. A proportional derivative (PD) controller is also tuned through a Takagi-Sugeno fuzzy model (T-S). Furthermore, several closed-loop stability tests were carried out, in numerical simulation and real-time implementation. The feasibility of our methodology is illustrated through the tracking of several angles’ profiles in a real test scenario. For the tracking of a trajectory or several set-points, we have obtained mean errors about 0.6545 and 0.8651 degrees, respectively. Some mechatronic integrations to convert a conventional tractor into a basic Autonomous Agriculture Off-road Tractor (AAOT) are also shown.
Green Synthesis and Radial Breathing Modes in Ti Nanoparticles
R. Britto-Hurtado,M. CORTEZ-VALADEZ,Ramón A. B. Alvarez,P. Horta-Fraijo,J.-G. BOCARANDO-CHACON,R. Gamez-Corrales,A. Perez-Rodríguez,F. Martínez-Suarez,F. Rodríguez-Melgarejo,H. Arizpe-Chavez,M. FLORES 성균관대학교(자연과학캠퍼스) 성균나노과학기술원 2015 NANO Vol.10 No.5
This work presents the synthesis of metallic nanoparticles of titanium. The extract from the nopal (Opuntia ficus-indica) plant was used as the redactor agent. The results of transmission electronic microscopy (TEM) show that nanoparticles have a sphere-like shape with an approximate diameter of 1 – 4 nm. The presence of Ti in these particles was corroborated by energy dispersive X-ray spectroscopy (EDS). Optical properties were detected with the presence of absorption bands centered in 295 nm and 355 nm, similar to those reported in the literature. Two Raman bands centered at 359 cm-1 and 404 cm-1 were observed after the synthesis of titanium nanoparticles. Afterwards, structural and vibrational parameters of small clusters of Ti (Tin, n=3 – 13) were analyzed by the density functional theory (DFT) at the B3LYP level of approximation combined with the basis set LANL2DZ. Radial breathing modes (RBMs) were detected in the vibrational spectrum of each cluster, placed around 298 – 387 cm-1.
Final design of the generic upper port plug structure for ITER diagnostic systems
Pak, S.,Feder, R.,Giacomin, T.,Guirao, J.,Iglesias, S.,Josseaume, F.,Kalish, M.,Loesser, D.,Maquet, P.,Ordieres, J.,Panizo, M.,Pitcher, S.,Portales, M.,Proust, M.,Ronden, D.,Serikov, A.,Suarez, A.,Tan North-Holland ; Elsevier Science Ltd 2016 Fusion engineering and design Vol.102 No.-
The generic upper port plug (GUPP) structure in ITER is a 6m long metal box which deploys diagnostic components into the vacuum vessel. This structure is commonly used for all the diagnostic upper ports. The final design of the GUPP structure, which has successfully passed the final design review in 2013, is described here. The diagnostic port plug is cantilevered to the vacuum vessel with a heavy payload at the front, so called the diagnostic first wall (DFW) and the diagnostic shield module (DSM). Most of electromagnetic (EM) load (~80%) occurs in DFW/DSM. Therefore, the mounting design to transfer the EM load from DFW/DSM to the GUPP structure is challenging, which should also comply with thermal expansion and tolerance for assembly and manufacturing. Another key design parameter to be considered is the gap between the port plug and the vacuum vessel port. The gap should be large enough to accommodate the remote handling of the heavy port plug (max. 25t), the structural deflection due to external loads and machine assembly tolerance. At the same time, the gap should be minimized to stop the neutron streaming according to the ALARA (as low as reasonably achievable) principle. With these design constraints, the GUPP structure should also provide space for diagnostic integration as much as possible. This requirement has led to the single wall structure having the gun-drilled water channels inside the structure. Furthermore, intensive efforts have been made on the manufacturing study including material selection, manufacturing codes and French regulation related to nuclear equipment and safety. All these main design and manufacturing aspects are discussed in this paper, including requirements, interfaces, loads and structural assessment and maintenance.
Ponce-Garcia, Gustavo,Villanueva-Segura, Olga K.,Garza-Elizondo, Karina,Villegas-Ramirez, Heriberto M.,Fernandez-Salas, Ildefonso,Rodriguez-Sanchez, Iram P.,Dzul-Manzanilla, Felipe,Flores-Suarez, Adri The Korea Society for Parasitology and Tropical Me 2022 The Korean Journal of Parasitology Vol.60 No.3
The head louse Pediculus humanus capitis (De Geer) is a hematophagous ectoparasite that inhabits the human scalp. The infestations are asymptomatic; however, skin irritation from scratching occasionally may cause secondary bacterial infections. The present study determined the presence and frequency of the knockdown resistance (kdr) mutation T929I in 245 head lice collected from Mexico, Peru, and Canada. Head lice were collected manually using a comb in the private head lice control clinic. Allele mutation at T9291 was present in 100% of the total sampled populations (245 lice) examined. In addition, 4.89% of the lice were homozygous susceptible, whereas 6.93% heterozygous and 88.16% homozygous were resistant, respectively. This represents the second report in Mexico and Quebec and fist in Lima.