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1
artículo
Publicado 2018
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The amniotic band syndrome (ABS) is characterized by accumulation of fibrous tissue bands or strings that adhere to the fetus and may produce compression in different sites. Most cases present multiple congenital anomalies incompatible with life. A small group of fetuses have isolated constrictions of the limb that may cause severe limb dysfunction or limb amputation if not treated during pregnancy. This rare condition occurs in approximately 1:1 200 to 1:15 000 live births. The exact cause of ABS remains uncertain; however, theories of intrinsic, extrinsic and iatrogenic reasons have been proposed. The evolution of the limb affected by ABS is characterized by progression of distal edema due to venous obstruction, and intrauterine amputation of the limb from vascular insufficiency. Fetoscopic release of the amniotic bands through minimally invasive surgery techniques may allow life prese...
2
informe técnico
Publicado 1964
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Supplement to TN D-1419. "A Phase-Locked Phase Filter for the Minitrack System", 13 p.
3
documento de trabajo
Publicado 1990
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It is now known that turbulence and mixing in the lower stratosphere occurs in intermittent layers of thickness between about 30 and 300 meters. Layered structures also exist in the ocean (Woods, 1969) and in the atmospheres of the other planets (Gierasch and Conrath, 1987). It appears that dissipative processes in stratified geophysical fluids frequently take place in thin layers. It is therefore of great importance to observe and document the nature of these dynamical regions. The Arecibo facility is uniquely capable of performing these high resolution measurements. The S-band radar system has been configured for high resolution studies of the lower stratosphere, and data have been collected and analyzed, demonstrating its potential and capabilities. Previous e:ffort was directed to a description of a wide region of the atmosphere, with only brief attention dedicated to continuous ob...
4
artículo
Nowadays, the Remote Sensing like scientific activity, related to Earth Sciences, has been constituted in a useful and profitable tool in the technological and industrial tasks, offering valuable information for diverse applications. One of them and that we will insist on this investigation is to identify carbonates, silica. By the nature of the study we will use sensors that have several bands in the thermal infrared, by the availability of the information and cost, initially we will use the data ASTER.
5
artículo
Publicado 2019
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Amniotic band syndrome is a congenital fetal abnormality characterized by fibrous bands and multiple disruptive anomalies that vary in presentation and complexity, some of which are incompatible with life. We present 18 cases of this syndrome and the associated pathology. Five newborns and 13 fetuses were examined following the standard pathological examination protocol. Nine were males and nine, females, with body weight varying from less than 100 g to 3 680 g. Cases of amniotic bands affected fingers (13 cases), limbs (5 cases), lips (6 cases), face (6 cases), head (6 cases), abdominal wall (2 cases) and umbilical cord (8 cases). Eight cases included associated malformations in heart, lungs, kidneys, gastrointestinal tract, and umbilical cord (single artery, velamentous insertion, short umbilical cord, nuchal cord). Maternal age was 17 to 41 years; 26 years in average. There were 11 pr...
6
documento de trabajo
Publicado 1989
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The·objective of OUT work is to propase end analyze a decoding procedure useful to achieve unprecedented spatial and temporal resolution in CW S-band radar measurements at the AO. We find that using hard limiting transformations of the detected echoes (to achieve computational speed) does not distort significantly the process of spectral estimation. Moreover our procedure is efficient in the sense that statistical accuracy of individual estimates is kept with small increase in (coherent) integration time specially if the time series is oversampled. These characteristics make our estimation method very convenient.
7
informe técnico
Publicado 2023
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CCD imaging was performed of the NGC 1640 field using the OAUNI 51cm telescope at Huancayo Observatory, Peru, on 2023-08-19.310 (UT). No source is detected at the position of AT 2023pow (TNSTR-2023-1982) with limiting magnitude R ~ 18.5. This is consistent with the AT 2023pow report by T. Noguchi few hours after the detection alert. The OAUNI project is supported by UNI, TWAS, IGP and ProCiencia-Concytec (Convenio133-2020 Fondecyt).
8
artículo
Nowadays, the Remote Sensing like scientific activity, related to Earth Sciences, has been constituted in a useful and profitable tool in the technological and industrial tasks, offering valuable information for diverse applications. One of them and that we will insist on this investigation is to identify carbonates, silica. By the nature of the study we will use sensors that have several bands in the thermal infrared, by the availability of the information and cost, initially we will use the data ASTER.
9
artículo
Seismo-volcano source localization is essential to improve our understanding of eruptive dynamics and of magmatic systems. The lack of clear seismic wave phases prohibits the use of classical location methods. Seismic antennas composed of one-component (1C) seismometers provide a good estimate of the backazimuth of the wavefield. The depth estimation, on the other hand, is difficult or impossible to determine. As in classical seismology, the use of three-component (3C) seismometers is now common in volcano studies. To determine the source location parameters (backazimuth and depth), we extend the 1C seismic antenna approach to 3Cs. This paper discusses a high-resolution location method using a 3C array survey (3C-MUSIC algorithm) with data from two seismic antennas installed on an andesitic volcano in Peru (Ubinas volcano). One of the main scientific questions related to the eruptive pro...
10
artículo
Publicado 2018
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This text is an ethnographic and sound approach to the «banda típica» (traditional band), one of the traditional musical groups with the greatest presence in the festivities of the districts and peasant communities of the province of Chumbivilcas, department of Cuzco, Peru. It is a descriptive work that examines the places where the band participates, the manner of dressing of its members, its instrumental composition and organization, the subject of the musical themes they interpret and their characteristic toques, exemplified by sound files recorded during field work and stored on the Internet to accompany this article.The field work began in March 2015 and gathers information obtained through participant observation, informal conversations, as well as individual and group interviews with traditional and popular musicians in the framework of the anniversary of the province ...
11
artículo
The topological materials permit transport of polarized charges through edge and surface states in 2D y 3D systems. These edge and surfaces states are protected by topological symmetry order that is based in spin-orbit coupling and in the invariance under time reversal operator.The main purpose of this work is to analyze the evolution of the surface state from HgTe and CdTe alloys observing the band inversion and the effect of d atomic orbital on the band inversion and the spin-orbit coupling intensity.Results where obtained using density functional theory with a local spin density approximation and the Hubbard correction (SLDA+U) considering relativistic effects and spin polarization.
12
artículo
Publicado 2000
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We determine the complex refractive index (N) of a semiconducting CdSe thin film from the measurements of the transmittance spectrum. The experiment allow us to obtain, from the real part of refractive index, the N dispersive law, and from the imaginary part, the absortion coefficient. An energy dependence analysis of the absorption coefficient is done to obtain the value of the forbidden band ''GAP'' of thesemiconductor and the nature of the optical transition.
13
artículo
Publicado 2018
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This text is an ethnographic and sound approach to the «banda típica» (traditional band), one of the traditional musical groups with the greatest presence in the festivities of the districts and peasant communities of the province of Chumbivilcas, department of Cuzco, Peru. It is a descriptive work that examines the places where the band participates, the manner of dressing of its members, its instrumental composition and organization, the subject of the musical themes they interpret and their characteristic toques, exemplified by sound files recorded during field work and stored on the Internet to accompany this article.The field work began in March 2015 and gathers information obtained through participant observation, informal conversations, as well as individual and group interviews with traditional and popular musicians in the framework of the anniversary of the province ...
14
artículo
Publicado 2020
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Once quantum computer is running it is possible to expect that more quantum computers are interconnected in the same manner as the classical ones, so that Internet is seen as an imminent task in these advanced devices. As in classical machines, the well-known In-Band-Full-Duplex (IBFD) technique can be applied in order to enhance performance. However, quantum computers depend strongly on field interaction as the responsible to achieve Rabi transitions. Using the Quamtum Fourier transformation we interpret the resulting equations in terms of the Hamiltonian action.
15
objeto de conferencia
Publicado 2012
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Presentación que se llevó a cabo durante el IV Congreso Internacional de Computación y Telecomunicaciones COMTEL 2012 del 24 al 26 de octubre de 2012 en Lima, Perú. COMTEL, es un certamen organizado por la Facultad de Ingeniería de Sistemas, Cómputo y Telecomunicaciones de la Universidad Inca Garcilaso de la Vega, que congrega a profesionales, investigadores y estudiantes de diversos países con el fin de difundir e intercambiar conocimientos, mostrar experiencias académicas-científicas y soluciones para empresas en las áreas de Computación, Telecomunicaciones y disciplinas afines.
16
tesis de maestría
Publicado 2017
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El propósito de este proyecto fue diseñar y fabricar un amplificador de bajo ruido (LNA) que funcione en una banda de frecuencia de 5 GHz, utilizando el transistor de alta movilidad de electrones (HEMT) de Avago Technologies. Para mejorar nuestro diseño, era necesario construir un amplificador de dos etapas; una etapa para trabajar con una sensibilidad mínima al ruido y otra etapa para obtener la ganancia máxima que puede alcanzar el transistor. Este trabajo de tesis se llevó a cabo como parte del proyecto del sistema UAV (vehículo aéreo no tripulado) desarrollado por un grupo de investigación en el departamento de comunicación por radio y electrónica de microondas, UMH.
17
tesis de grado
Publicado 2010
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Los sistemas de comunicaciones por satélite en la banda L han sido objeto de un interés considerable en los últimos años y un número, cada vez mayor, de servicios de comunicación-navegación ya están trabajando o tienen previsto trabajar en esta banda de frecuencias. Tras el éxito del lanzamiento y adquisición del tercer satélite Inmarsat-4 el 18 de agosto de 2008, un nuevo sistema de comunicación por satélite de banda ancha llamada BGAN (desarrollado por Immarsat) puede completar la cobertura mundial en la banda L. Por otro lado, los Sistemas Mundiales de Navegación por Satélite (GNSS) permiten una amplia gama de nuevas aplicaciones que se hacen particularmente atractivas hoy en día; estas aplicaciones pueden ser: navegación, localización, gestión de desastres; estos sistemas son una realidad cada vez más presente y su despliegue es una infraestructura global. Algunos...
18
artículo
This research was carried out as part of the project titled "Variabilidad Estelar en la Galaxia" (Stellar Variability in the Galaxy) supported by CONCYTEC (Consejo Nacional de Ciencia, Tecnologia e Innovacion Tecnologica, Peru). We also thank the 2MASS, SIMBAD, ALADIN, and VSNET online databases which allowed us access to valuable data from other observers.
19
artículo
Publicado 2017
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Celiac disease (CD) is an immune reaction to gluten containing foods such as rye, wheat and barley. This condition affects individuals with a genetic predisposition; it targets the small bowel and may cause symptoms including diarrhea, malabsorption, weight loss, abdominal pain and bloating. The diagnosis is made by serologic testing of celiac-specific antibodies and confirmed by histology. Certain endoscopic characteristics, such as scalloping, reduction in the number of folds, mosaic-pattern mucosa or nodular mucosa, are suggestive of CD and can be visualized under white light endoscopy. Due to its low sensitivity, endoscopy alone is not recommended to diagnose CD; however, enhanced visual identification of suspected mucosal abnormalities through the use of new technologies, such as narrow band imaging with magnification (NBI-ME), could assist in targeting biopsies and thereby increasi...
20
artículo
Publicado 2023
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The behavior of the second band of the Intertropical Convergence Zone (ITCZ) near the Peruvian coast during early 2017 is studied, using precipitation, surface winds, sea surface temperature (SST) and atmospheric variables in different isobaric levels. The proposal of a daily index (Ia) to identify opportunely the formation of this band and the Lorenz energy terms in the region is also considered. This band was present from late January to early April 2017, associated with an anomalous dipole of sea level pressure between the east and west eastern Equatorial Pacific that configured anomalously northerly surface winds and the release of southeasterly trade winds near Peru. In medium levels, a zonally oriented positive mixing ratio anomaly was observed in early March over the ITCZ second band, associated with heavy rain systems over the northern Peruvian coastal region. In the same period,...
