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Colina-Martinez, Ana L. De la,Martinez-Barrera, Gonzalo,Barrera-Diaz, Carlos E.,Avila-Cordoba, Liliana I.,Urena-Nunez, Fernando Techno-Press 2017 Advances in concrete construction Vol.5 No.6
Transparency, excellent toughness, thermal stability and a very good dimensional stability make Polycarbonate (PC) one of the most widely used engineering thermoplastics. Polycarbonate market include electronics, automotive, construction, optical media and packaging. One alternative for reducing the environmental pollution caused by polycarbonate from electronic waste (e-waste), is to use it in cement concretes. In this work, physical and chemical characterization of recycled polycarbonate from electronic waste was made, through the analysis by Fourier transform infrared spectroscopy (FTIR), X-ray diffraction (XRD), energy dispersive spectroscopy (EDS) and scanning electron microscope (SEM). Then cement concrete was made with Portland cement, sand, gravel, water, and this recycled polycarbonate. Specimens without polycarbonate were produced for comparison purposes. The effect of the particle sizes and concentrations of recycled polycarbonate within the concrete, on the compressive strength and density was studied. Results show that compressive strength values and equilibrium density of concrete depend on the polycarbonate particle sizes and its concentrations; particularly the highest compressive strength values were 20% higher than that for concrete without polycarbonate particles. Moreover, morphological, structural and crystallinity characteristics of recycled polycarbonate, are suitable for to be mixed into concrete.
An Unusual Case of Extra-Enteric Blastocystosis in the Uterine Cervix
Yolanda Escutia-Guzman,Williams Arony Martinez-Flores,Joel Martinez-Ocana,Ramon Martinez-Pimentel,Marisol Benitez-Ramirez,Fernando Martinez-Hernandez,Sara Arroyo-Escalante,Mirza Romero-Valdovinos,Guad 대한기생충학열대의학회 2020 The Korean Journal of Parasitology Vol.58 No.5
Quality monitoring of complex manufacturing systems on the basis of model driven approach
Fernando Castano,Rodolfo E. Haber,Wael M. Mohammed,Miroslaw Nejman,Alberto Villalonga,Jose L. Martinez Lastra 국제구조공학회 2020 Smart Structures and Systems, An International Jou Vol.26 No.4
Monitoring of complex processes faces several challenges mainly due to the lack of relevant sensory information or insufficient elaborated decision-making strategies. These challenges motivate researchers to adopt complex data processing and analysis in order to improve the process representation. This paper presents the development and implementation of quality monitoring framework based on a model-driven approach using embedded artificial intelligence strategies. In this work, the strategies are applied to the supervision of a microfabrication process aiming at showing the great performance of the framework in a very complex system in the manufacturing sector. The procedure involves two methods for modelling a representative quality variable, such as surface roughness. Firstly, the hybrid incremental modelling strategy is applied. Secondly, a generalized fuzzy clustering c-means method is developed. Finally, a comparative study of the behavior of the two models for predicting a quality indicator, represented by surface roughness of manufactured components, is presented for specific manufacturing process. The manufactured part used in this study is a critical structural aerospace component. In addition, the validation and testing are performed at laboratory and industrial levels, demonstrating proper real-time operation for non-linear processes with relatively fast dynamics. The results of this study are very promising in terms of computational efficiency and transfer of knowledge to manufacturing industry.
A parametric study of optimum tall piers for railway bridge viaducts
Martinez-Martin, Francisco J.,Gonzalez-Vidosa, Fernando,Hospitaler, Antonio,Yepes, Victor Techno-Press 2013 Structural Engineering and Mechanics, An Int'l Jou Vol.45 No.6
This paper presents a parametric study of reinforced concrete bridge tall piers with hollow, rectangular sections. Such piers are typically used in railway construction of prestressed concrete viaducts. Twenty one different piers have been studied with seven column heights of 40, 50, 60, 70, 80, 90 and 100 m and three types of 10-span continuous viaducts, whose main span lengths are 40, 50 and 60 m. The piers studied are intermediate columns placed in the middle of the viaducts. The total number of optimization design variables varies from 139 for piers with column height of 40 m to 307 for piers with column height of 100 m. Further, the results presented are of much value for the preliminary design of the piers of prestressed concrete viaducts of high speed railway lines.
( Maria Lourdes Posadas Martinez ),( Fernando Javier Vazquez ),( Fernan Gonzalez Bernaldo De Quiros ),( Liliana Paloma Rojas ),( Gabriel Dario Waisman ),( Diego Hernan Giunta ) 대한내과학회 2014 대한내과학회 추계학술대회 Vol.2014 No.1
Background: Venous thromboembolism (VTE) is the most common cause of preventable mortality in hospitalized patients. On plus, pulmonary embolism (PE) is responsible for 5-10% of all hospital deaths. Objective: To estimate the incidence density (ID) and hospital mortality of VTE among clinical and surgical inpatients. Methods: Prospective cohort, during a period of 7 years, of incident cases of VTE, PE, and deep venous thrombosis (DVT), in patients of 17 years and older, hospitalized at the internal medicine and surgery department of a tertiary care hospital in Buenos Aires. Fatality rate of patients with VTE was calculated. Results: 2042 episodes of VTE were registered. Sixty two percent (1258) were patients from the Internal Medicine Service: 635 cases (95%, CI:601-671) presented VTE, 446 cases (95%, CI:418-476) presented DVT and 286 cases (95% CI:264-311) presented PE per 1000 person-days of hospitalization. For patients hospitalized at surgery department: 102 cases (95%, CI:96-110), 83 (95%, CI: 77-90) and 31 cases (95%, CI: 27-35) per 1000 person-days of hospitalization presented VTE, DVT and PE respectively. The VTE represented between 3 to 9 % of hospital deaths, it increases with age independently of being clinical or surgical inpatients. Conclusions: In Argentina, there are few data of incidences of VTD and hospital mortality in patients with VTE. This information may be important when assessing the need for resources for prevention, diagnosis and treatment in hospitals.
Matus-Aragon, Miguel Angel,Gonzalez-Ceron, Fernando,Salinas-Ruiz, Josafhat,Sosa-Montes, Eliseo,Pro-Martinez, Arturo,Hernandez-Mendo, Omar,Cuca-Garcia, Juan Manuel,Chan-Diaz, David Jesus Asian Australasian Association of Animal Productio 2021 Animal Bioscience Vol.34 No.11
Objective: The study aimed to evaluate the productive performance, carcass yield, size of digestive organs and nutrient utilization in Mexican Creole chickens, using four diets with different concentrations of metabolizable energy (ME, kcal/kg) and crude protein (CP, %). Methods: Two hundred thirty-six chickens, coming from eight incubation batches, were randomly distributed to four experimental diets with the following ME/CP ratios: 3,000/20, 2,850/19, 2,700/18 and 2,550/17. Each diet was evaluated with 59 birds from hatching to 12 weeks of age. The variables feed intake (FI), body weight gain (BWG), feed conversion (FC), mortality, carcass yield, size of digestive organs, retention of nutrients, retention efficiency of gross energy (GE) and CP, and excretion of N were recorded. Data were analyzed as a randomized block design with repeated measures using the GLIMMIX procedure of SAS, with covariance AR (1) and adjustment of degrees of freedom (Kendward-Roger), the adjusted means were compared with the least significant difference method at a significance level of 5%. Results: The productive performance variables BWG, mortality, carcass yield, fat and GE retention and excretion of N were not different (p>0.05) due to the diet effect. In the 3,000/20 diet, the chickens had lower values of FI, FC, crop weight, gizzard weight, retention, and retention efficiency of CP (p<0.05) than the chickens of the 2,550/17 diet. Conclusion: The Mexican Creole chickens from hatching to 12 weeks of age can be feed with a diet with 2,550 kcal ME and 17% CP, without compromising productive parameters (BWG, mortality, carcass yield) but improving retention and retention efficiency of CP.
( Roberto Monreal Robles ),( Hugo L Gallardo Blanco ),( Fernando J Lavalle Gonzalez ),( Ricardo M Cerda Flores ),( Pavel Carrillo Molina ),( Minerva G Martinez Cavazos ),( Laura E Martinez Garza ),( J 대한내과학회 2014 대한내과학회 추계학술대회 Vol.2014 No.1
Background: Currently there are a growing number of individuals with type 2 diabetes (T2D) imposing a signifi cant public health burden due to disability and premature death. Diabetes is the most common cause of death in Mexico. It is estimated that 11.7 million Mexicans will have diabetes by the year 2025. The risk of developing T2D is determined by genetic and environmental factors. However, large differences in prevalence between ethnic groups exist and seem to depend on genetic factors. Nearly 40 different T2D susceptibility loci, mainly in Europeans have been identifi ed. The aim of this study was to identify susceptibility loci related to T2D in our population. Methods: We studied 128 SNPs in or near 42 genes, most of which had been replicated in other populations. A case-control association study comprising 186 controls, 211 early-onset T2D (diagnosed before 45 years of age) and 173 late-onset T2D individuals was conducted. Actually we preliminary reported the genotypifi cation analyses of 256 individuals. Results: Subjects with T2D independently of age at diagnosis have higher mass body index than controls (27.5 vs 25.7 kg/m2, P= <0.0001). The median age for early-onset T2D, late-onset T2D and controls individuals were 46, 61 and 62 years, respectively. Age at diagnosis for early-onset and late-onset T2D individuals was 35 and 52 years, respectively. The allelic variants of genes KCNJ11 (rs5219), LEPR (rs11208654), IGF2BP2 (rs4402960), VLDLR (rs2242103), KCNQ1 (rs2237892), RPTOR (rs12946115), SLC25A18 (rs1296819) show association with T2D in this preliminary analysis. These polymorphism previously mentioned affect directly or indirectly over insulin release and peripheral sensitivity. Conclusions: We found our population to have an important genetic predisposition to T2D. The associated susceptibility loci for T2D support the hypothesis that insulin release defects and peripheral resistance are the main mechanisms predisposing to T2D in Mexican population.
A cost-effective method to prepare size-controlled nanoscale zero-valent iron for nitrate reduction
Claudio Adrian Ruiz-Torres,Rene Fernando Araujo-Martinez,Gabriel Alejandro Martinez-Cas,J. Elpidio Morales-Sanchez,Tae-Jin Lee,Hyun-Sang Shin,Yuhoon Hwang,Abel Hurtado-Macias,Facundo Ruiz 대한환경공학회 2019 Environmental Engineering Research Vol.24 No.3
Nanoscale zero-valent iron (nZVI) has proved to be an effective tool in applied environmental nanotechnology, where the decreased particle diameter provides a drastic change in the properties and efficiency of nanomaterials used in water purification. However, the agglomeration and colloidal instability represent a problematic and a remarkable reduction in nZVI reactivity. In view of that, this study reports a simple and cost-effective new strategy for ultra-small (< 7.5%) distributed functionalized nZVI-EG (1-9 ㎚), with high colloidal stability and reduction capacity. These were obtained without inert conditions, using a simple, economical synthesis methodology employing two stabilization mechanisms based on the use of non-aqueous solvent (methanol) and ethylene glycol (EG) as a stabilizer. The information from UV-Vis absorption spectroscopy and Fourier transform infrared spectroscopy suggests iron ion coordination by interaction with methanol molecules. Subsequently, after nZVI formation, particle-surface modification occurs by the addition of the EG. Size distribution analysis shows an average diameter of 4.23 ㎚ and the predominance (> 90%) of particles with sizes < 6.10 ㎚. Evaluation of the stability of functionalized nZVI by sedimentation test and a dynamic light-scattering technique, demonstrated very high colloidal stability. The ultra-small particles displayed a rapid and high nitrate removal capacity from water.
( Yasser Hessen Abdou ),( Maria Angeles Perez Martinez ),( Natalia Pinlla Echevarri ),( Maria Thiscal Lopez Lluva ),( Fernando Lozano Ruiz Poveda ),( Ignacio Sanchez Perez ),( Miguel Angel Rienda More 대한내과학회 2014 대한내과학회 추계학술대회 Vol.2014 No.1
A 36 year-old man was referred to our hospital for the evaluation of an abnormal shadow on the cardiac apex on a chest X-ray fi lm.He denied systemic disease such as hypertension or diabetes mellitus and had no history of specifi c conditions, such as Kawasaki`s disease, chest trauma or connective tissue disorder. He had no subjective symptoms. His blood pressure was 120/75 mmHg and pulse rate was 70 beats/min. On physical examination, continuous murmur of a grade II/VI was audible at 4th left intercostal space. The results of other physical examination and blood test were normal. A Chest X-ray showed a radio-opaque shadow at the apex. An echocardiography was arranged and a round sac of 4x4 cm located in the apex, as well as a double-chamber right ventricle was observed Contrast echocardiography with Sonovue showed the fi lling of the vascular sac with contrast then partial fi lling of the distal RV apex. The abnormal vascular sac was connected from the left side to a vascular structure that looks to be coronary artery and from the right side to the distal part of a double right ventricle apex with a bi-directional shunt (fi stula). It also demonstrates the high velocity and centrifuge nature of blood fl ow in the vascular sac. Chest CT showed a LAD ectasia with a 4x4 cm saccular aneurysm at the distal portion of LAD Cardiac MRI revealed a giant left descending coronary artery distal aneurysm attached to a double apex right ventricle Coronary angiography revealed a dilated LAD with a huge saccular coronary aneurysm at its distal portion. The patient refused surgical correction for the coronary aneurysm and fi stula. He was discharged and has been followed up for more than 1 year without cardiovascular events.