10,784 research outputs found
Distributed closed-loop EO-STBC for a time-varying relay channel based on kalman tracking
No full textThis paper considers distributed closed-loop extended orthogonal space-time block coding (EO-STBC) for amplify-forward relaying over time-varying channels. In between periodically injected pilot symbols for training, the smooth variation of the fading channel coefficients is exploited by Kalman tracking. We show in this paper that the joint variation of both relay channels still motivates the use of a higher-order auto-regressive model for the a priori prediction step within a decision-feedback system, compared to a first-order standard Kalman model. Simulations results compare these two case and highlight the benefits of the proposed higher-order Kalman filter, which offer joint decoding and tracking
Old MacDonald had a Fyrm, eo, eo, y: two marginal developments of < eo > in Old and Middle English
No full text'Old MacDonald had a Fyrm, eo, eo, y: two marginal developments of eo in Old and Middle English' uses the new possibilities for linguistic research afforded by the Dictionary of Old English Corpus to help show phonological developments in Old and Middle English
Estudio del entorno natural de la ría del Eo
No full textSe complementa con un cuaderno de campo cuyo registro es 17980051Este trabajo propone un estudio del entorno más inmediato de la ría del Eo, en el límite de Asturias con Galicia. Se ofrece información sobre geología, fauna y vegetación acompañada de ilustraciones y esquemas, además aporta datos sobre los recursos existentes en cuanto a cultivos marinos, astilleros y turismo; los impactos medioambientales detectados en la zona, así como información sobre la ría del Eo como espacio natural protegido. La metodología, las actividades propuestas a realizar en el itinerario ecológico por la ría y las que se proponen realizar antes y después de realizar el itinerario. Acaba relacionando el material bibliográfico, de laboratorio audiovisual y el preciso para las salidas de campo.ES
Chemical composition and antimicrobial activity of essential oil from Piper marginatum leaves obtained by hydrodistillation in pH4, pH7 and pH10
No full textEl presente estudio tuvo como objetivo evaluar posibles variaciones en la composición química y la actividad antimicrobiana de los aceites esenciales de hojas de Piper marginatum obtenidos por hidrodestilación con pH4, pH7 y pH10. La comparación indicó que los perfiles químicos de los tres aceites eran diferentes. Se observó una reducción de los principales fenilpropanoides, Z-Asarona, dilapiol y E-asarona, en las muestras pH4-EO y pH10-EO comparadas con la muestra pH7-EO. Los sesquiterpenos macrocarpeno (10,8 %), viridiflorene (9,1 %), cariofileno (7,7 %) y E-nerolidol (6,5 %) fueron los principales compuestos detectados en la muestra pH10-EO. El compuesto α-santonina (36,1 %) fue el componente principal del aceite esencial obtenido con pH 4. La actividad antimicrobiana de los aceites esenciales también mostró variaciones en los valores de la concentración mínima inhibitoria (CMI). El aceite obtenido con pH4 exhibió una fuerte actividad, con una CMI de 78,1 µg/ml tanto para Escherichia coli como para Candida utilis. El estudio mostró la influencia del pH del agua en la composición química de los aceites esenciales obtenidos por hidrodestilación y la importancia del pH del agua como un parámetro que debe especificarse en los estudios que utilizan el método de hidrodestilación.The present study aimed to evaluate possible variations in the chemical composition and antimicrobial activity of essential oils extracted from Piper marginatum leaves obtained by hydrodistillation at pH4, pH7, and pH10. When compared, the chemical profiles of the three oils were different. A reduction of major phenylpropanoids Z-asarone, dillapiole, and E-asarone was observed for samples pH4-EO and pH10-EO as compared to sample pH7- EO. Sesquiterpenes macrocarpene (10.8%), viridiflorene (9.1%), caryophyllene (7.7%), and E-nerolidol (6.5%) were the major compounds identified in the pH10-EO sample. Compound α-santonin (36.1%) was identified as a major constituent of the essential oil obtained at pH4. The antimicrobial activity of the essential oils also showed variations in their minimum inhibitory concentration values (MIC). The oil obtained at pH4 exhibited strong activity with an MIC of 78.1 µg/ml for both Escherichia coli and Candida utilis microorganisms. We evidenced the influence of water pH on the chemical composition of essential oils obtained by hydrodistillation, as well as its importance as a parameter in studies using the hydrodistillation method
Polylithic Integration of SAW Devices using Quartz-on-Silicon Process for True Single Chip Radio
No full textThe author would like to thanks LG Innotek Company for the fabrication of high Q SAW resonator. This work is supported by MICROS (Micro Information and Communication Remote Object-oriented System) Research Center
Effect of combined mulberry leaf and fruit extract on liver and skin cholesterol transporters in high fat diet-induced obese mice.
No full textObesity is an epidemic disease characterized by an increased inflammatory state and chronic oxidative stress with high levels of pro-inflammatory cytokines and lipid peroxidation. Moreover, obesity alters cholesterol metabolism with increases in low-density lipoprotein (LDL) cholesterols and triglycerides and decreases in high-density lipoprotein (HDL) cholesterols. It has been shown that mulberry leaf and fruit ameliorated hyperglycemic and hyperlipidemic conditions in obese and diabetic subjects. We hypothesized that supplementation with mulberry leaf combined with mulberry fruit (MLFE) ameliorate cholesterol transfer proteins accompanied by reduction of oxidative stress in the high fat diet induced obesity. Mice were fed control diet (CON) or high fat diet (HF) for 9 weeks. After obesity was induced, the mice were administered either the HF or the HF with combination of equal amount of mulberry leaf and fruit extract (MLFE) at 500mg/kg/day by gavage for 12 weeks. MLFE treatment ameliorated HF induced oxidative stress demonstrated by 4-hydroxynonenal (4-HNE) and modulated the expression of 2 key proteins involved in cholesterol transfer such as scavenger receptor class B type 1 (SR-B1) and ATP-binding cassette transporter A1 (ABCA1) in the HF treated animals. This effect was mainly noted in liver tissue rather than in cutaneous tissue. Collectively, this study demonstrated that MLFE treatment has beneficial effects on the modulation of high fat diet-induced oxidative stress and on the regulation of cholesterol transporters. These results suggest that MLFE might be a beneficial substance for conventional therapies to treat obesity and its complications. © 2014 The Korean Nutrition Society
Estudio del entorno natural de la ría del Eo : cuaderno de campo
No full textComo material de apoyo para desarrollar el proyecto educativo de estudio del entorno más cercano centrado en la ría del Eo, que separa las comunidades de Galicia y Asturias. Este cuaderno de campo presenta apartados para ir cubriendo: 1-Estudio de la vegetación (en la ría y en la orilla): análisis de flores, estado de conservación. 2-Reconocimiento de aves. 3-Actividades de Geología. Este esquema se repite en el itinerario ecológico por la ría del Eo, tomando como referencia 6 estaciones o puntos de observación; el cuaderno de campo está diseñado de tal modo que pueda ser utilizado en una sola, en varias o en todas las estaciones. En otro apartado se añaden unas orientaciones ante las salidas y una relación de materiales a utilizar.ES
Quantifying the Uncertainty of Short-Term Vegetation Anomalies Detection Using Eo-Based Coarse-Resolution Vegetation Products
No full textSatellite-based Earth Observation systems archived a variety of vegetation products during the last 50 years, which can reveal regional to global ecosystem dynamics across diverse spatiotemporal scales. The anomaly metrics such as Vegetation Condition Index (VCI) defined by comparing the current vegetation growth condition to historical average status based on long-term EO-based vegetation products were widely used to delineate abnormal vegetation variation exerted by either climatic or anthropogenic factors (e.g., droughts, wildfires). However, currently available long-term vegetation products may differ from each other in terms of sensors (observational platform or spectral bands), bio-physical definitions (e.g., NDVI, EVI, LAI, and VOD), spatiotemporal resolution, as well as the time-spans, which results in inconsistency across these vegetation products. Taking the VCI as an example, this study evaluated the uncertainty of vegetation anomalies detected based on different vegetation products over the middle reach of the Yangtze River by explicitly considering the effect of sensors, biophysical definitions, and time-spans. The preliminary results showed that VCI derived from NDVI products from different sensors (AVHRR vs. MODIS) induced significant inconsistent anomalies over most landscapes. The differences resulting from products with different biophysical definitions (NDVI vs. EVI, LAI, and VOD) are much lower than those from different sensors but still significant over specific areas. As for the time-spans, the 20-year NDVI based VCI presented a considerable reduction in variance over the study area on average compared to VCI calculated based on 5-year NDVI. In summary, caution should be taken when applying EO-based vegetation products for vegetation anomalies mapping, especially for quantitative assessment.Green Open Access added to TU Delft Institutional Repository 'You share, we take care!' - Taverne project https://www.openaccess.nl/en/you-share-we-take-care Otherwise as indicated in the copyright section: the publisher is the copyright holder of this work and the author uses the Dutch legislation to make this work public.Optical and Laser Remote Sensin
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