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Enhancing the memristive effects in SnO2 nanowire networks
Moisés Lucas A.,Chiquito Adenilson J. 한국물리학회 2023 Current Applied Physics Vol.53 No.-
We present a study of SnO2 nanowire network acting as a resistive memory device. Charge transport features in these devices were controlled by modulating the behavior of the energy barriers of nanowire-nanowire interfaces and the Schottky barrier under the electrodes. Both barriers were found to be affected by the distribution and availability of charges along the nanowires mesh and in the surrounding atmosphere. The consequent memristive effect was dependent of the environment conditions but also controllable by managing the availability of charges for the transport properties. Using a polymeric barrier layer to avoid the direct contact of nanowires with the surrounding atmosphere proved to be an effective method to obtain reliable/better results after many memristive cycles. This simple procedure of polymeric coating offers some benefits such a more stable gain and a ON/OFF ratio improvement (from 1.55 to 3.60). Furthermore, coated devices showed potential features for use in synaptic learning applications.
Moisé,s Roberto Vallejo Pé,rez,Hugo Ricardo Navarro Contreras,Jesú,s A. Sosa Herrera,José,Pablo Lara Á,vila,Hugo Magdaleno Ramí,rez Tobí,as,Fernando Dí,az-Barriga Mart& 한국식물병리학회 2018 Plant Pathology Journal Vol.34 No.5
Clavibacter michiganensis subsp. michiganesis (Cmm) is a quarantine-worthy pest in México. The implementation and validation of new technologies is necessary to reduce the time for bacterial detection in laboratory conditions and Raman spectroscopy is an ambitious technology that has all of the features needed to characterize and identify bacteria. Under controlled conditions a contagion process was induced with Cmm, the disease epidemiology was monitored. Micro-Raman spectroscopy (532 nm λ laser) technique was evaluated its performance at assisting on Cmm detection through its characteristic Raman spectrum fingerprint. Our experiment was conducted with tomato plants in a completely randomized block experimental design (13 plants × 4 rows). The Cmm infection was confirmed by 16S rDNA and plants showed symptoms from 48 to 72 h after inoculation, the evolution of the incidence and severity on plant population varied over time and it kept an aggregated spatial pattern. The contagion process reached 79% just 24 days after the epidemic was induced. Micro-Raman spectroscopy proved its speed, efficiency and usefulness as a non-destructive method for the preliminary detection of Cmm. Carotenoid specific bands with wavelengths at 1146 and 1510 cm-1 were the distinguishable markers. Chemometric analyses showed the best performance by the implementation of PCA-LDA supervised classification algorithms applied over Raman spectrum data with 100% of performance in metrics of classifiers (sensitivity, specificity, accuracy, negative and positive predictive value) that allowed us to differentiate Cmm from other endophytic bacteria (Bacillus and Pantoea). The unsupervised KMeans algorithm showed good performance (100, 96, 98, 91 y 100%, respectively).
Moisés R. Cesário,Daniel A. Macedo,Rosane M. P. B. Oliveira,Patrícia M. Pimentel,Roberto L. Moreira,Dulce M. A. Melo 한양대학교 세라믹연구소 2011 Journal of Ceramic Processing Research Vol.12 No.1
Strontium-doped lanthanum manganite (La1−xSrxMnO3) is a commonly used cathode in solid oxide fuel cells. In this study,La0.80Sr0.20MnO3 powder was prepared by the modified Pechini’s method using gelatin as the polymerizing agent. The polymeric resin obtained was characterized by thermogravimetric analysis and the powder calcined at 900 oC for 4 h has been characterized by X-ray diffraction, scanning electron microscopy and infrared spectroscopy. The La0.80Sr0.20MnO3 phase exhibited rhombohedral symmetry. The infrared reflectance spectrum was dominated by a conduction mechanism besides the signature of less pronounced phonon features, characteristics of the crystal lattice. The present results indicated that the gelatin has been an efficient directional element to be used in La0.80Sr0.20MnO3 synthesis, and it is a low cost material, non toxic and makes the polymeric precursor synthesis less complicated.
Analysis of Polymeric Knitted Fabrics on Properties for Telecommunications Devices Application
Marcos S. Aquino,Samanta M. Holanda,Thiago F. Santos,Moisés V. Melo,Nestor D. L. Junior,Idalmir S. Q. Júnior,Humberto D. Andrade 한국섬유공학회 2019 Fibers and polymers Vol.20 No.11
The growing development of telecommunications, especially mobile telecommunications, has intensified researchinto microfiber antennas in the last years, since these have unique properties as well as a wide range of applications. Theresearch in the field of wearable technology is impelled by the demand for increasingly light and flexible devices, whereelectronic components are entirely embedded in their textile structures. The knitted fabrics have the necessary elasticity tocreate adaptive and sporty pieces, allowing high mobility and comfort to its users. The concept of textile antennas is based onmalleability and, for this reason, they can have great utility in applications where the stiffness of traditional antennas isconsidered a limitation, especially in military or biomedical garments. This study aims to determine the properties of thenatural and synthetic fibers knitted fabric for use in microwave devices, presenting the materials and methods used in theresearch to the prototyping and simulation of a microstrip antenna. Four knitted fabrics with different structures (Jersey andSimple Piquet) and fiber compositions (Cotton and Cotton with Polyamide) were selected. The determination of the electricalproperties was performed through the coaxial probe method to obtain the permittivity and tangent loss properties, and thedetermination of the physical properties according to the technical standards, where the textile properties (weight,dimensional stability, yarn count and tensile strength) of the analyzed samples were determined. The results were analyzedaccording to the proposed application and the CO_Piquet presented the lower loss tangent and better dimensional stability,the microstrip antenna was dimensioned to a frequency of 2.45 GHz according to the transmission line and resonant cavitymethod, and simulated in the HFSS where loss return, radiation diagrams and current density parameters was obtained.
Gene Expression Profiling in Patients with Idiopathic Pulmonary Fibrosis (IPF) in the INMARK Trial
( Jin Woo Song ),( Moisés Selman ),( R Gisli Jenkins ),( Eric S White ),( Vincent Cottin ),( Yasuhiko Nishioka ),( Imre Noth ),( Antje Prasse ),( Benjamin Strobel ),( German Leparc ),( Carina Ittrich 대한결핵 및 호흡기학회 2020 대한결핵 및 호흡기학회 추계학술대회 초록집 Vol.128 No.-
Background The INMARK trial investigated blood biomarkers as predictors of disease progression in patients with IPF and preserved lung function. In this study, we investigated changes in gene expression levels in patients treated with nintedanib and placebo. Methods Subjects with IPF and FVC ≥80% predicted were randomized 1:2 to receive nintedanib or placebo for 12 weeks followed by open-label nintedanib for 40 weeks. Total RNA was extracted from whole blood samples taken at baseline and week 12. Changes in gene expression levels from baseline to week 12 were analyzed. Data were log2 transformed prior to analysis. Changes in gene expression levels were considered significant if p≤0.05 and |log2fold change|≥0.5. Results Of 116 and 230 subjects randomized to receive nintedanib and placebo, respectively, data from 110 and 217 patients were included in the analysis. Of 60,675 genes evaluated, 14,799 had counts per million ≥1 in at least half the samples from either treatment group per time point and were included in the analysis. In adjusted analyses, compared with baseline levels, no genes were downregulated after 12 weeks’ treatment with placebo, while nine genes were downregulated after 12 weeks’ treatment with nintedanib (Table). No genes were upregulated. In unadjusted analyses, the change from baseline in expression level at week 12 was significantly different between nintedanib and placebo for five genes (SHISA4, LTF, CTSG, OLFM4, DEFA4) (Table). Pathways analysis suggested that the genes downregulated in patients treated with nintedanib were related to neutrophil function and extracellular matrix organization. Conclusions These analyses of the INMARK trial, based on genome-wide transcriptome profiling, identified a small number of genes that were downregulated after 12 weeks of nintedanib treatment in subjects with IPF and preserved lung function. The potential of gene expression profiling as a marker of treatment response in patients with IPF requires further study.