A5101664113- Stellar, planetary, and galactic studies
- Astronomy and Astrophysical Research
- Astro and Planetary Science
- Astrophysics and Star Formation Studies
- Astronomical Observations and Instrumentation
- Fluid Dynamics and Heat Transfer
- Plant Physiology and Cultivation Studies
- History and Developments in Astronomy
- Fluid Dynamics Simulations and Interactions
- Horticultural and Viticultural Research
- Surface Modification and Superhydrophobicity
- Solar Thermal and Photovoltaic Systems
- Fermentation and Sensory Analysis
- Greenhouse Technology and Climate Control
- Banana Cultivation and Research
- Solar Energy Systems and Technologies
- Plant and soil sciences
- Membrane Separation and Gas Transport
- Recycling and Waste Management Techniques
- Polysaccharides Composition and Applications
- Postharvest Quality and Shelf Life Management
- Molecular Spectroscopy and Structure
- Plant Surface Properties and Treatments
- Muon and positron interactions and applications
- Building Energy and Comfort Optimization
University of Piura
2023
National University of Distance Education
2010
Universidad Nacional Autónoma de México
1993-2009
Universidad Autónoma de Madrid
2001-2004
In this paper we present the first comprehensive results extracted from spectroscopic campaigns carried out by EXPORT (EXoPlanetary Observational Research Team) consortium. During 1998-1999, an intensive observational effort in framework of origin and evolution protoplanetary systems order to obtain clues on evolutionary path early stages pre-main sequence stars with planets already formed. The spectral types 70 stars, projected rotational velocities, , 45 mainly Vega-type sequence, have...
For a complete understanding of the physical processes causing photometric variability pre-main sequence systems, simultaneous optical and near-IR observations are required to disentangle emission from stars that their associated circumstellar disks. Data this sort extremely rare little systematic work has been reported date. The presented in paper is attempt direction. It presents an analysis 18 Herbig Ae/Be T Tauri which were observed October 98 by EXPORT collaboration. time difference...
This paper presents optical UBVRI broadband photo-polarimetry of the EXPORT sample obtained at 2.5 m Nordic Optical Telescope. The database consists multi-epoch 68 pre-main-sequence and main-sequence stars. An investigation polarization variability indicates that 22 objects are variable 3σ level in our data. All these pre-main sequence stars, consisting both T Tauri Herbig Ae/Be while main sequence, Vega type post-T not variable. properties sources mostly indicative UXOR-type behaviour; show...
We present a study of the stellar parameters, distances and spectral energy distributions (SEDs) HD 34282 141569, two pre-main sequence Herbig AeBe stars. Both objects have been reported to show "anomalous positions" in HR diagram sense that they appear below main sequence. A significant result this work is both stars are metal-deficient. The Hipparcos distance very uncertain current places star at expected evolutionary position diagram, i.e. as PMS star. for 141569 found matches distance,...
We present near-IR JHK photometric data of a sample 58 main-sequence, mainly Vega-type, and pre-main sequence stars. The were taken during four observing runs in the period May 1998 to January 1999 form part coordinated effort with simultaneous optical spectroscopy photo-polarimetry. colors MS stars correspond most cases photospheric colors, although noticeable reddening is towards few objects, these show no brightness variability within observational errors. On other hand, PMS excesses...
We present high resolution (lambda / Delta_lambda = 49000) echelle spectra of the intermediate mass, pre-main sequence stars BF Ori, SV Cep, WW Wul and XY Per. The cover range 3800-5900 angstroms monitor on time scales months days. All show a large number Balmer metallic lines with variable blueshifted redshifted absorption features superimposed to photospheric stellar spectra. Synthetic Kurucz models are used estimate rotational velocities, effective temperatures gravities stars. best...
We present the results of a high spectral resolution () study circumstellar (CS) gas around intermediate mass, pre-main sequence star UX Ori. The are based on set 10 échelle spectra covering range 3800–5900 Å, monitoring time scales months, days and hours. A large number transient blueshifted redshifted absorption features detected in Balmer many metallic lines. multigaussian fit is applied to determine for each velocity, v, dispersion , parameter R, which provides measure strength CS gas....
One of the most important problems encountered in die-casting processes is porosity due to air entrapment molten metal during injection process. The aim this work study experimentally and numerically different phenomena that may take place early stages filling a vertical die cavity with rectangular shape for operating conditions typically used low medium-pressure processes. Special attention given determining influence gravitational forces on flow pattern. Numerical simulation carried out...
In 1998 the EXPORT team monitored microlensing event light curves using a charge-coupled device (CCD) camera on IAC 0.8-m telescope Tenerife to evaluate prospect of northern telescopes find microlens anomalies that reveal planets orbiting lens stars. The high airmass and more limited time available for observations Galactic bulge sources make site less favourable planet searches. However, there are potentially large number 1-m class could devote few hours per night monitor ongoing events....
Abstract A series of MMA‐HEMA polymer (hydroxyethyl methacrylate) membranes were prepared using several copolymer precursor mixtures and characterized by transmission scanning electron microscopy. The correlation between the preparation methods microstructure porous layers was sought. cryofracture procedures also investigated in order to observe microscope. It found that porosity intermediate transport layer depends on molecular weight composition MMA/HEMA ratio; presence dimethylformamide...
This study presents a technological alternative analysis including modeling, measurement, and comparison of forced convection dryer aided by photovoltaic energy natural greenhouse-type solar dryer. The semi-cylindrical greenhouse with dimensions 4 m x 4.7 the capacity to dry 200 kg wet parchment coffee was able achieve drying times three half days for two convection, reducing moisture content from 52% 12% on basis. In same manner, desiccant air temperatures in range 60 – 70 °C 50 were...
In this work, a solar greenhouse dryer has been developed to carry out the drying process of parchment coffee beans despite adverse climatic conditions area where they have implemented, maintain safety throughout process, and reduce time, which will allow obtaining product with better organoleptic properties greater market value. Fifty dryers type built in district Lalaquiz, Huancabamba, Piura (Peru), their correct operation verified by analyzing temperature relative humidity air at three...