Miguel Velázquez
A5032421992- Superconducting and THz Device Technology
- Astronomy and Astrophysical Research
- Radio Astronomy Observations and Technology
- Adaptive optics and wavefront sensing
- Calibration and Measurement Techniques
- Galaxies: Formation, Evolution, Phenomena
- Stellar, planetary, and galactic studies
- Microwave Engineering and Waveguides
- Scientific Research and Technology
- Telemedicine and Telehealth Implementation
- Astronomical Observations and Instrumentation
- Advancements in Semiconductor Devices and Circuit Design
- Astrophysics and Cosmic Phenomena
- Semiconductor materials and devices
- Artificial Intelligence in Healthcare
- Thermal Radiation and Cooling Technologies
- Gamma-ray bursts and supernovae
- Mobile Health and mHealth Applications
- Astrophysics and Star Formation Studies
- Healthcare Systems and Technology
- Silicon Carbide Semiconductor Technologies
- Soil Moisture and Remote Sensing
- Quantum and electron transport phenomena
- CCD and CMOS Imaging Sensors
- Healthcare Systems and Public Health
National Institute of Astrophysics, Optics and Electronics
2014-2025
New York Structural Biology Center
2025
Stony Brook University
2025
Cedars-Sinai Medical Center
2023
Cardiff University
2022
Universidad Autónoma de Coahuila
2019
Ministerio de Salud Pública y Bienestar Social
2016-2018
Facility for Airborne Atmospheric Measurements
2018
Universidad Complutense de Madrid
2014-2018
Lawrence Livermore National Laboratory
2009-2015
We present the first results from largest deep extragalactic millimetre-wavelength survey undertaken to date. These are derived maps covering over 0.7 deg^2, made at 1.1mm, using AzTEC continuum camera mounted on James Clerk Maxwell Telescope. The were in two fields originally targeted 0.85mm with SCUBA SHADES project, namely Lockman Hole East (mapped a depth of 0.9-1.3 mJy rms) and Subaru XMM Deep Field (1.0-1.7 rms). wealth existing forthcoming multi-frequency data these will allow bright...
We present the first results from a confusion-limited map of Great Observatories Origins Deep Survey-South (GOODS-S) taken with AzTEC camera on Atacama Submillimeter Telescope Experiment. imaged field to 1σ depth 0.48–0.73 mJy beam−1, making this one deepest blank-field surveys at mm-wavelengths ever achieved. Although by traditional standards our GOODS-S is extremely confused due sea faint underlying sources, we demonstrate through simulations that source identification and number counts...
An understanding of the mass build-up in galaxies over time necessitates tracing evolution cold gas (molecular and atomic) galaxies. To that end, we have conducted a pilot study called CO Observations with LMT Blind Ultra-Deep H I Environment Survey (COOL BUDHIES). We observed 23 around two clusters Abell 2192 (z = 0.188) 963 0.206), where 12 are cluster members 11 slightly foreground or background, using about 28 total hours on Redshift Search Receiver (RSR) Large Millimeter Telescope (LMT)...
TolTEC is a three-band imaging polarimeter for the Large Millimeter Telescope. Simultaneously observing with passbands at 1.1mm, 1.4mm and 2.0mm, has diffraction-limited beams FWHM of 5, 7, 11 arcsec, respectively. Over coming decade, will perform combination PI-led Open-access Legacy Survey projects. Herein we provide an overview instrument give first quantitative measures its performance in lab prior to shipping telescope 2021.
Cryo-electron tomography (cryo-ET) is a powerful technique for visualizing the ultrastructure of cells in three dimensions (3D) at nanometer resolution. However, manual segmentation cellular components cryo-ET data remains significant bottleneck due to its complexity and time-consuming nature. In this work, we present novel workflow that integrates advanced virtual reality (VR) software enhance both efficiency accuracy segmenting datasets. This leverages an immersive VR tool with intuitive...
This paper reports on the refurbishment of a dual-band 23/31 GHz tipping radiometer previously used to measure atmospheric water vapor content at Hartebeesthoek Radio Astronomy Observatory. We describe motivation for refurbishment, provide technical details modifications made instrument, and present preliminary test results field measurements site High Energy Stereoscopic System Observatory in Namibia. Together with other radiometric measurements, this instrument will contribute...
We present observations at 1.1 mm towards 16 powerful radio galaxies and a radio-quiet quasar 0.5<z<6.3 acquired with the AzTEC camera mounted JCMT ASTE to study spatial distribution of submillimeter possible protocluster regions. The survey covers total area 1.01 square degrees rms depths 0.52 - 1.44 mJy detects 728 sources above 3sigma. find overdensities factor ~2 in source counts 3 individual fields (4C+23.56, PKS1138-262 MRC0355-037) over areas ~200 sq deg. When combining all fields,...
We present constraints on the dust continuum flux and inferred gas content of a gravitationally lensed massive quiescent galaxy at $z$=1.883$\pm$0.001 using AzTEC 1.1mm imaging with Large Millimeter Telescope. MRG-S0851 appears to be prototypical compact galaxy, but has evidence that it experienced centrally concentrated rejuvenation event in last 100 Myr (see Akhshik et al. 2020). This is undetected image we calculate an upper limit millimeter use this estimate H$_2$ mass via empirically...
MEGARA (<i>Multi-Espectrógrafo en GTC de Alta Resolución para Astronomía</i>) is an optical Integral-Field Unit (IFU) and Multi-Object Spectrograph (MOS) designed for the 10.4m telescope in La Palma. offers two IFU fiber bundles, one covering 12.5x11.3 arcsec<sup>2</sup> with a spaxel size of 0.62 arcsec (Large Compact Bundle; LCB) another 8.5x6.7 0.42 (Small SCB). The MOS mode will allow observing up to 100 objects region 3.5x3.5 arcmin<sup>2</sup> around bundles. Both LCB capabilities...
MEGARA (Multi-Espectrógrafo en GTC de Alta Resolución para Astronomía) is an optical Integral-Field Unit (IFU) and Multi-Object Spectrograph (MOS) designed for the 10.4m telescope in La Palma that being built by a Consortium led UCM (Spain) also includes INAOE (Mexico), IAA-CSIC (Spain), UPM (Spain). The instrument currently finishing AIV will be sent to on November 2016 its on-sky commissioning April 2017. IFU fiber bundle (LCB) covers 12.5x11.3 arcsec2 with spaxel size of 0.62 arcsec while...
ABSTRACT We present Large Millimeter Telescope (LMT)/AzTEC 1.1 mm observations of ∼100 luminous high-redshift dusty star-forming galaxy candidates from the $\sim 600\,$ sq.deg Herschel-ATLAS survey, selected on basis their SPIRE red far-infrared colours and with $S_{500\, \mu \rm m}=35-80$ mJy. With an effective $\theta _{\rm FWHM}\approx 9.5\,$arcsec angular resolution, our reveal that at least 9 per cent targets break into multiple systems signal-to-noise ratio ≥4 members. The fraction...
On June 25th 2017, the new intermediate-resolution optical IFU and MOS of 10.4-m GTC had its first light. As part tests carried out to verify performance instrument in two modes (IFU MOS) 18 spectral setups (identical number VPHs with resolutions R=6000-20000 from 0.36 1 micron) a astronomical objects were observed. These observations show that MEGARA@GTC is called fill niche high-throughput, intermediateresolution extremely-faint narrow-lined objects. Lyman-α absorbers, star-forming dwarfs...
MEGARA is the new generation IFU and MOS optical spectrograph built for 10.4m Gran Telescopio CANARIAS (GTC). The project was developed by a consortium led UCM (Spain) that also includes INAOE (Mexico), IAA-CSIC UPM (Spain). instrument arrived to GTC on March 28th 2017 successfully integrated commissioned at telescope from May August 2017. During on-sky commissioning we demonstrated powerful robust provides intermediate-to-high spectral resolutions RFWHM ~ 6,000, 12,000 20,000 an...
For uncooled resistive microbolometers, the properties that are necessary in thermosensing materials order to obtain high responsivity and detectivity a temperature coefficient of resistivity (TCR), low resistivity, noise. The most used for these applications boron‐doped amorphous silicon (a‐Si:H,B) silicon–germanium (a‐Si x Ge y :H), however, those present some drawbacks such as relatively TCR values poor stability. In this work, we performed deposition electrical characterization...
Nowadays cryogenic electronics represents a very important research field thanks to significant efforts done so far. In this manuscript, we present an electrical and thermal characterization for standard 14nm SOI p-type FinFET from 300K down ~340mK, where report changes of various parameters in temperature range, these results allow us highlight the fact that transistor keep working properly at sub-Kelvin temperatures. addition, Zero Temperature Coefficient (ZTC) is presented technology as...
MEGARA (Multi-Espectrógrafo en GTC de Alta Resolución para Astronomía) is an optical Integral-Field Unit and Multi-Object Spectrograph designed for the (Gran Telescopio Canarias) 10.4m telescope in La Palma. project has already passed preliminary design review optics critical review, first-light it expected to take place at end of 2016. a development under GRANTECAN contract. In this paper we summarize current status LN2 open-cycle cryostat which been by "Astronomical Instrumentation Lab...
MEGARA (Multi-Espectrógrafo en GTC de Alta Resolución para Astronomía) is the new integral field unit (IFU) and multi-object spectrograph (MOS) instrument for GTC. The subsystems include pseudo-slit, shutter, collimator with a focusing mechanism, pupil elements on volume phase holographic grating (VPH) wheel camera joined to cryostat through last lens, CCD detector inside. In this paper we describe full preliminary design of which will harbor spectrograph. selected cryogenic device an LN2...
<bold>Objetivo.</bold> <italic>Determinar la viabilidad y puesta en marcha de un sistema telediagnóstico para dar asistencia sanitaria a poblaciones remotas dispersas del Paraguay.</italic> <bold>Métodos.</bold> <italic>El estudio fue realizado todos los hospitales regionales, generales principales distritales las 18 regiones sanitarias Paraguay. En el se registraron datos clínicos imágenes tomográficas, ecográficas trazados electrocardiográficos paciente que precisaba diagnóstico por parte...
The mm-wavelength sky reveals the initial phase of structure formation, at all spatial scales, over entire observable history Universe. Over past 20 years, advances in detectors and camera systems have allowed field to take enormous strides forward – particularly study Cosmic Microwave Background but limitations mapping speeds, sensitivity resolution plagued studies astrophysical phenomena. In fact, due inherent biases ground-based surveys conducted last 2 decades continue motivate need for...
Since Moore's law has promoted a rapid evolution of FET technologies sometimes, key aspects stay unnoticed while novel nodes appear at the horizon. In this manuscript we present study comparing performance 65 nm MOSFET and 14 SOI finFET technology, both low temperatures, where main electrical parameters are analyzed. case cooled it down to 77 K, for finFET, achieve 340 mK. Thus, intend work is provide vision which technology better each application, such as quantum computing, astronomy,...
Introduction: Information and communication technologies (ICTs) applied to the healthcare offer multiple advantages for diagnostic services remote consultations. However, evidence on diagnosis improvement in rural communities is limited. The usability of telemedicine improve coverage Paraguay was investigated. Methods: goal this descriptive study evaluate whether a system implemented public regional district hospitals over period 3 years from 2014 2016 could facilitate universal communities....
Dusty star-forming galaxies (DSFGs) detected at $z > 4$ provide important examples of the first generations massive galaxies. However, few with spectroscopic confirmation are currently known, Hershel struggling to detect significant numbers 6$ DSFGs. NGP6_D1 is a bright 850 $\mu m$ source (12.3 $\pm$ 2.5 mJy) no counterparts shorter wavelengths (a SPIRE dropout). Interferometric observations confirm it single source, evidence for any optical or NIR emission, nearby likely foreground lensing...
The Mexico-UK Submillimetre Camera for AsTronomy (MUSCAT) is a 1.1 mm receiver consisting of 1,500 lumped-element kinetic inductance detectors (LEKIDs) the Large Millimeter Telescope (LMT; Volcán Sierra Negra in Puebla, México). MUSCAT utilises maximum field view LMT's upgraded 50-metre primary mirror and first México-UK collaboration to deploy millimetre/sub-mm on Telescope. Using simplistic simulator, we estimate predicted mapping speed by combining measured performance with observed sky...