The Beauty of Symmetry: Common-mode rejection filters for high-speed interconnects and balanced microwave circuits

Common-mode rejection filters operating at microwave frequencies have been the subject of intensive research activity in the last decade. These filters are of interest for the suppression of common-mode noise in high-speed digital circuits, where differential signals are widely employed due to the high immunity to noise, electromagnetic interference (EMI) and crosstalk of differential-mode interconnects. These filters can also be used to improve common-mode rejection in microwave filters and circuits dealing with differential signals. Ideally, common-mode stopband filters should be transparent for the differential mode from DC up to very high frequencies (all-pass), should preserve the signal integrity for such mode, and should exhibit the widest and deepest possible rejection band for the common mode in the region of interest. Moreover, these characteristics should be achieved by means of structures with the smallest possible size. In this article, several techniques for the implementation of common-mode suppression filters in planar technology are reviewed. In all the cases, the strategy to simultaneously achieve common-mode suppression and all-pass behavior for the differential mode is based on selective mode-suppression. This selective mode suppression (either the common or the differential mode) in balanced lines is typically (although not exclusively) achieved by symmetrically loading the lines with symmetric resonant elements, opaque for the common-mode and transparent for the differential mode (common-mode suppression), or vice versa (differential-mode suppression).MINECO, Spain-TEC2013-40600-R, TEC2013-41913-PGeneralitat de Catalunya-2014SGR-15

Propuesta de manual de funciones del departamento de Administración Tributaria de la Alcaldía Municipal de Tipitapa.

El estudio tiene como propósito, elaborar una propuesta del manual de funciones UAT de la Alcaldía de Tipitapa, con lo cual se aporta una fuente de información, de tal forma que facilite a sus colaboradores la correcta ejecución de las diferentes actividades y tareas en su cargo, estableciendo de manera clara y precisa un alcance de cada colaborador en particular

Urea Treatment of Syndrome of Inappropriate Antidiuretic Hormone Secretion Secondary to Amyotrophic Lateral Sclerosis

Amyotrophic lateral sclerosis (ALS) rarely presents with hyponatraemia caused by syndrome of inappropriate antidiuretic hormone secretion (SIADH). We present a patient with hyponatraemia of multifactorial aetiology, in whom, after withdrawal of the drugs that contributed to this ionic alteration, SIADH secondary to ALS was confirmed. After initiating treatment with urea, sodium levels were normalized

Identificação de riscos obstétricos em tempos de COVID-19 em uma área de saúde comunitária, Equador

Introduction: risk factors associated with complications in the mother-child pair include: history of hypertensive disorders, adolescent pregnancy, drug use, unfavorable obstetric history with a background of miscarriages or abortions, sexually transmitted diseases and urinary tract infections. Objective: to identify the obstetric risk in times of COVID-19 pandemic at the ¨Bastión Popular¨ health area, Guayaquil, Ecuador, from January to June 2021. Method: a descriptive-transversal field research was carried out, with a quantitative approach, which favored the analysis of the obstetric risk categories recorded in the medical history of 117 pregnant women, who signed an informed consent, for the collection of data through home visits, using the obstetric risk scale or score. Results: outcomes assessment showed, as main result, that the most frequent obstetric risk group was the age group 20 to 24 and the high risk factor was the main category identified. Obstetric risk increased proportionally when the interpregnancy interval was reduced. Conclusions: young women between 20 and 24 years of age are those who presented the highest obstetric risk, which is correlate with a higher number of gestations, abortions, deliveries and cesarean sections. Therefore, it is necessary to provide women with information about pregnancy and its complications, so that they are able to identify risk factors during pregnancy, delivery and the puerperium.Introducción: entre los factores de riesgo que se asocian a complicaciones en el binomio madre-hijo se encuentran: antecedentes de trastornos hipertensivos, embarazo adolescente, consumo de drogas, historia obstétrica desfavorable con antecedentes de abortos u óbitos, enfermedades de transmisión sexual e infecciones del tracto urinario. Objetivo: identificar el riesgo obstétrico en tiempos de pandemia por COVID-19 en el área de salud ¨Bastión Popular¨, Guayaquil, Ecuador, en el periodo enero-junio de 2021. Método: se realizó una investigación de campo, de tipo descriptiva-transversal, con un enfoque cuantitativo, que propició el análisis de las categorías del riesgo obstétrico registradas en historias clínicas de 117 gestantes, con firma de consentimiento informado para la obtención de los datos en dicha localidad a través de visitas domiciliarias. Fue empleada la escala o score de riesgo obstétrico. Resultados: se alcanzó como resultado fundamental que el grupo etario de riesgo obstétrico de mayor frecuencia correspondió a las edades comprendidas entre 20 y 24 años y la principal categoría identificada fue el Alto riesgo. El riesgo obstétrico aumentó de manera proporcional cuando el periodo intergenésico se redujo. Conclusiones: las mujeres jóvenes de 20 a 24 años son las que presentaron mayor riesgo obstétrico, además que el riesgo obstétrico, el cual se encuentra correlacionado con un mayor número de gestas, abortos, partos y cesáreas, por ello, es necesario proporcionarle información a la mujer sobre la gestación y sus complicaciones, para que sean capaces de identificar los factores de riesgos durante el embarazo, parto y puerperio.Introdução: entre os fatores de risco que estão associados às complicações no binômio mãe-filho estão: histórico de doenças hipertensivas, gravidez na adolescência, uso de drogas, histórico obstétrico desfavorável com histórico de abortos ou óbitos, doenças sexualmente transmissíveis e infecções do trato urinário trato. Objetivo: identificar o risco obstétrico em tempos de pandemia de COVID-19 na área de saúde "Bastión Popular", Guayaquil, Equador, no período janeiro-junho de 2021. Método: foi realizada uma investigação de campo descritiva. com abordagem quantitativa, que levou à análise das categorias de risco obstétrico registradas nos prontuários de 117 gestantes, com consentimento informado assinado para obtenção dos dados na referida localidade por meio de visitas domiciliares. Foi utilizada a escala ou escore de risco obstétrico. Resultados: o principal resultado foi que a faixa etária de risco obstétrico mais frequente correspondeu às idades entre 20 e 24 anos e a principal categoria identificada foi Alto risco. O risco obstétrico aumentou proporcionalmente quando o período intergestacional foi reduzido. Conclusões: as mulheres jovens de 20 a 24 anos são as que apresentam maior risco obstétrico, além do risco obstétrico, que se correlaciona com maior número de gestações, abortos, partos e cesarianas, portanto, é necessário fornecer informações às mulheres sobre a gravidez e suas complicações, para que possam identificar os fatores de risco durante a gravidez, parto e puerpério

Cohort profile: the Hortega Study for the evaluation of non-traditional risk factors of cardiometabolic and other chronic diseases in a general population from Spain.

PURPOSE: The Hortega Study is a prospective study, which investigates novel determinants of selected chronic conditions with an emphasis on cardiovascular health in a representative sample of a general population from Spain. PARTICIPANTS: In 1997, a mailed survey was sent to a random selection of public health system beneficiaries assigned to the University Hospital Rio Hortega's catchment area in Valladolid (Spain) (n=11 423, phase I), followed by a pilot examination in 1999-2000 of 495 phase I participants (phase II). In 2001-2003, the examination of 1502 individuals constituted the Hortega Study baseline examination visit (phase III, mean age 48.7 years, 49% men, 17% with obesity, 27% current smokers). Follow-up of phase III participants (also termed Hortega Follow-up Study) was obtained as of 30 November 2015 through review of health records (9.5% of participants without follow-up information). FINDINGS TO DATE: The Hortega Study integrates baseline information of traditional and non-traditional factors (metabolomic including lipidomic and oxidative stress metabolites, genetic variants and environmental factors, such as metals), with 14 years of follow-up for the assessment of mortality and incidence of chronic diseases. Preliminary analysis of time to event data shows that well-known cardiovascular risk factors are associated with cardiovascular incidence rates, which add robustness to our cohort. FUTURE PLANS: In 2020, we will review updated health and mortality records of this ongoing cohort for a 5-year follow-up extension. We will also re-examine elder survivors to evaluate specific aspects of ageing and conduct geolocation to study additional environmental exposures. Stored biological specimens are available for analysis of new biomarkers. The Hortega Study will, thus, enable the identification of novel factors based on time to event data, potentially contributing to the prevention and control of chronic diseases in ageing populations

The clustering of galaxies in the SDSS-III Baryon Oscillation Spectroscopic Survey : baryon acoustic oscillations in the Data Releases 10 and 11 Galaxy samples

We present a one per cent measurement of the cosmic distance scale from the detections of the baryon acoustic oscillations (BAO) in the clustering of galaxies from the Baryon Oscillation Spectroscopic Survey, which is part of the Sloan Digital Sky Survey III. Our results come from the Data Release 11 (DR11) sample, containing nearly one million galaxies and covering approximately 8500 square degrees and the redshift range 0.2 < z < 0.7. We also compare these results with those from the publicly released DR9 and DR10 samples. Assuming a concordance Λ cold dark matter (ΛCDM) cosmological model, the DR11 sample covers a volume of 13 Gpc3 and is the largest region of the Universe ever surveyed at this density. We measure the correlation function and power spectrum, including density-field reconstruction of the BAO feature. The acoustic features are detected at a significance of over 7σ in both the correlation function and power spectrum. Fitting for the position of the acoustic features measures the distance relative to the sound horizon at the drag epoch, rd, which has a value of rd,fid = 149.28 Mpc in our fiducial cosmology. We find DV = (1264 ± 25 Mpc)(rd/rd,fid) at z = 0.32 and DV = (2056 ± 20 Mpc)(rd/rd,fid) at z = 0.57. At 1.0 per cent, this latter measure is the most precise distance constraint ever obtained from a galaxy survey. Separating the clustering along and transverse to the line of sight yields measurements at z = 0.57 of DA = (1421 ± 20 Mpc)(rd/rd,fid) and H = (96.8 ± 3.4 km s−1 Mpc−1)(rd,fid/rd). Our measurements of the distance scale are in good agreement with previous BAO measurements and with the predictions from cosmic microwave background data for a spatially flat CDM model with a cosmological constant.Publisher PDFPeer reviewe

The clustering of galaxies in the SDSS-III Baryon Oscillation Spectroscopic Survey: Baryon Acoustic Oscillations in the Data Release 9 Spectroscopic Galaxy Sample

We present measurements of galaxy clustering from the Baryon Oscillation Spectroscopic Survey (BOSS), which is part of the Sloan Digital Sky Survey III (SDSS-III). These use the Data Release 9 (DR9) CMASS sample, which contains 264,283 massive galaxies covering 3275 square degrees with an effective redshift z=0.57 and redshift range 0.43 < z < 0.7. Assuming a concordance Lambda-CDM cosmological model, this sample covers an effective volume of 2.2 Gpc^3, and represents the largest sample of the Universe ever surveyed at this density, n = 3 x 10^-4 h^-3 Mpc^3. We measure the angle-averaged galaxy correlation function and power spectrum, including density-field reconstruction of the baryon acoustic oscillation (BAO) feature. The acoustic features are detected at a significance of 5\sigma in both the correlation function and power spectrum. Combining with the SDSS-II Luminous Red Galaxy Sample, the detection significance increases to 6.7\sigma. Fitting for the position of the acoustic features measures the distance to z=0.57 relative to the sound horizon DV /rs = 13.67 +/- 0.22 at z=0.57. Assuming a fiducial sound horizon of 153.19 Mpc, which matches cosmic microwave background constraints, this corresponds to a distance DV(z=0.57) = 2094 +/- 34 Mpc. At 1.7 per cent, this is the most precise distance constraint ever obtained from a galaxy survey. We place this result alongside previous BAO measurements in a cosmological distance ladder and find excellent agreement with the current supernova measurements. We use these distance measurements to constrain various cosmological models, finding continuing support for a flat Universe with a cosmological constant.Comment: 33 page

The Baryon Oscillation Spectroscopic Survey of SDSS-III

The Baryon Oscillation Spectroscopic Survey (BOSS) is designed to measure the scale of baryon acoustic oscillations (BAO) in the clustering of matter over a larger volume than the combined efforts of all previous spectroscopic surveys of large scale structure. BOSS uses 1.5 million luminous galaxies as faint as i=19.9 over 10,000 square degrees to measure BAO to redshifts z<0.7. Observations of neutral hydrogen in the Lyman alpha forest in more than 150,000 quasar spectra (g<22) will constrain BAO over the redshift range 2.15<z<3.5. Early results from BOSS include the first detection of the large-scale three-dimensional clustering of the Lyman alpha forest and a strong detection from the Data Release 9 data set of the BAO in the clustering of massive galaxies at an effective redshift z = 0.57. We project that BOSS will yield measurements of the angular diameter distance D_A to an accuracy of 1.0% at redshifts z=0.3 and z=0.57 and measurements of H(z) to 1.8% and 1.7% at the same redshifts. Forecasts for Lyman alpha forest constraints predict a measurement of an overall dilation factor that scales the highly degenerate D_A(z) and H^{-1}(z) parameters to an accuracy of 1.9% at z~2.5 when the survey is complete. Here, we provide an overview of the selection of spectroscopic targets, planning of observations, and analysis of data and data quality of BOSS.Comment: 49 pages, 16 figures, accepted by A