Restoration and conservation of anatomic pieces

Camila Cárdenas Guerrero Guzmán,Karen Alejandra Pérez Díaz,María Paula Ruíz Díaz,Valentina Díaz Sánchez,Andrés Camilo Ariza Aguirre,Laura Catalina Cantor Alfonso,Camila Andrea Suárez Ortiz,Davide Fali 대한해부학회 2019 Anatomy & Cell Biology Vol.52 No.3

In this study, a restoration process was developed with potassium hydroxide (KOH), in order to improve each of the structures for their posterior fixation, through the use of new methods such as the Chilean conservative fixative solution (SFCCh), with exceptional results. Restore anatomical pieces corresponding to corpse and organs, being these last set with the SFCCh. In this work dealt with processes of restoration with potassium hydroxide, sodium chloride, and sodium hypochlorite, the process began with the cleanliness and suture of the structures for subsequent fixing in Chilean conservative fixative solution, making use of a corpse and different anatomical parts. Work based on items found in the database, Elsevier, Science Direct, ProQuest, and MEDLINE. At the end of the process of restoration and conservation of the anatomical pieces, was observed an improvement in muscle pigment with decrease of rigidity in the specimen, additionally a recovery of appearance in the vascular-nervous elements was achieved. The organs were much more malleable and the structures facilitate the identification of specific details, its subsequent immersion in SFCCh allows the longer preservation of the obtained results. The restoration with potassium hydroxide allows the improvement in the appearance of the different anatomical structures and simultaneously to facilitate its study. The SFCCh is an alternative that replaces partially the use of formaldehyde. In addition, it presents toxicity reduction.

Neutron Capture Measuremetns on Minor Actinides at the n_TOF Facility at CERN: Past, Present and Future

D. Cano-Ott,F. Alvarez-Velarde,E. Gonzalez-Romero,C. Guerrero,T. Martinez,E. Mendoza,D. Villamarin,M. C. Vicente,U. Abbondanno,N. Colonna,M. H. Meaze,S. Marrone,G. Tagliente,R. Terlizzi,F. Belloni,K. 한국물리학회 2011 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.59 No.23

The successful development of advanced nuclear systems for sustainable energy production and nuclear waste management depends on high quality nuclear data libraries. Recent sensitivity studies and reports [1][2][3] have identified the need for substantially improving the accuracy of neutron cross-section data for minor actinides. The n_TOF collaboration has initiated an ambitious experimental program for the measurement of neutron capture cross sections of minor actinides. Two experimental setups have been constructed for this purpose: a Total Absorption Calorimeter (TAC) [4] for measuring neutron capture cross-sections of low-mass and/or radioactive samples and a set of two low neutron sensitivity C_6D_6 detectors for the less radioactive materials.

Validity of the Nielsen-type hanger arrangement in spatial arch bridges with straight decks

Mirian Cánovas-González,Juan M. García-Guerrero,Juan J. Jorquera-Lucerga 국제구조공학회 2023 Steel and Composite Structures, An International J Vol.47 No.1

In tied-arch bridges, a properly designed connection between the arch and the deck may become crucial, since the forces in the structure may be significantly reduced. This implies substantial material savings and, consequently, cheaper constructions. The introduction of the Nielsen cable arrangement (composed of V-shaped inclined hangers) in the last century was a milestone because it was able to reduce deflections and bending moments both in the arch and in the deck. So far, the Nielsen cable arrangement has proven to be successful in traditional vertical arch bridges. However, despite its advantages, it has not been widely applied to spatial arch bridges. Thus, this article analyses the difference between the structural behavior of spatial arch bridges with Nielsen-type cable arrangements with respect to those with classical vertical hanger configurations. The main goal is to verify whether the known effectiveness of the Nielsen cable arrangement for classical arch bridges is still preserved when applied to spatial arch bridges. In order to achieve this objective, and as the first part of our study, a set of different all-steel bridges composed of vertical and inclined arches with straight decks have been compared for both cable arrangements. As a major conclusion, for planar vertical arch bridges, the Nielsen-type cable arrangement is always the most effective. In addition, it also seems that, for spatial arch bridges composed of a straight deck and an inclined arch, it still keeps most of its effectiveness as long as the arch is moderately inclined.

Robust GPI Control of a New Parallel Rehabilitation Robot of Lower Extremities

Héctor Azcaray,Andrés Blanco,Carlos García,Manuel Adam,Juan Reyes,Gerardo Guerrero,César Guzmán 제어·로봇·시스템학회 2018 International Journal of Control, Automation, and Vol.16 No.5

In this paper, we propose a new robot for lower limbs rehabilitation by using a parallel structure. The goal of this robot is not only to produce smooth and precise motions for ankle, knee, and hip, but also to support trajectory tracking. Its parallel configuration was based on the four-bar mechanism in order to have a more stable and robust structure. For the kinematic analysis, the length of one bar was considered variable. For the dynamic analysis, the Euler-Lagrange method was used to define the equations of motion. For the robot control, the robust generalized proportional integral (GPI) controller was proposed to guarantee safe rehabilitation movements. This parallel robot not only showed good results, but also showed various movement possibilities for lower limbs rehabilitation.

Study of Photon Strength Function of Actinides: the Case of ^(235)U, ^(238)Np and ^(241)Pu

C. Guerrero,F. Alvarez-Velarde,D. Cano-Ott,T. Martinez,E. Mendoza,D. Villamarin,N. Colonna,M. H. Meaze,S. Marrone,G. Tagliente,R. Terlizzi,F. Belloni,U. Abbondanno,K. Fujii,P. M. Milazzo,C. Moreau,G. 한국물리학회 2011 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.59 No.23

The decay from excited levels in medium and heavy nuclei can be described in a statisticalapproach by means of Photon Strength Functions and Level Density distributions. The study of electromagnetic cascades following neutron capture based on the use of high eciency detectors has been shown to be well suited for probing the properties of the Photon Strength Function of heavy (high level density) and/or radioactive (high background) nuclei. In this work we have investigated for the first time the validity of the recommended PSF of actinides, in particular ^(235)U, ^(238)Np and ^(241)Pu. Our study includes the search for resonance structures in the PSF below S_n and draws conclusions regarding their existence and their characteristics in terms of energy, width and electromagnetic nature.

Characterization of the New n_TOF Neutron Beam: Fluence, Profile and Resolution

C. Guerrero,V. Becares,D. Cano-Ott,M. Fernandez-Ordonez,E. Gonzalez-Romero,F. Martin-Fuertes,T. Martinez,E. Mendoza,G. Pina,J. Quinones,V. Vlachoudis,M. Calviani,S. Andriamonje,M. Brugger,F. Cerutti,E 한국물리학회 2011 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.59 No.23

After a halt of four years, the n_TOF spallation neutron facility at CERN has resumed operation in November 2008 with a new spallation target characterized by an improved safety and engineering design, resulting in a more robust overall performance and efficient cooling. The first measurement during the 2009 run has aimed at the full characterization of the neutron beam. Several detectors, such as calibrated fission chambers, the n\textunderscore TOF Silicon Monitor, a MicroMegas detector with ^(10)B and ^(235)U samples, as well as liquid and solid scintillators have been used in order to characterize the properties of the neutron fluence. The spatial profile of the beam has been studied with a specially designed "X-Y" MicroMegas which provided a 2D image of the beam as a function of neutron energy. Both properties have been compared with simulations performed with the FLUKA code. The characterization of the resolution function is based on results from simulations which have been verified by the study of narrow capture resonances of ^(56)Fe, which were measured as part of a new campaign of (n, γ) measurements on Fe and Ni isotopes.

Economic Power Dispatch of Distributed Generators in a Grid-Connected Microgrid

Adriana C. Luna,Nelson L. Diaz,Fabio Andrade,Moises Graells,Josep M. Guerrero,Juan C. Vasquez 전력전자학회 2015 ICPE(ISPE)논문집 Vol.2015 No.6

Grid-connected microgrids with storage systems are reliable configurations for critical loads which can not tolerate interruptions of energy supply. In such cases, some of the energy resources should be scheduled in order to coordinate optimally the power generation according to a defined objective function. This paper defines a generationside power scheduling and economic dispatch of a gridconnected microgrid that supplies a fixed load and then, the scheduling is enhanced by including penalties in order to increase the use of the renewable energy sources and guarantee a high state of charge in the storage system for the next day. Linear models are proposed for the scheduling which are implemented in GAMS. The microgrid model is obtained deploying MATLAB/Simulink toolbox and then downloaded into dSPACE 1006 platform based on real-time simulation to test the economic dispatch. A compromise between cost and use of renewable energy is achieved.

An Alternative, Banana Peel-based Medium Used to Investigate the Catalytic Properties of Peroxidase from a Fungus, Inonotus sp SP2, Recently Isolated in Southern Chile

L. Garcés,C. Vásquez,E. Contreras,J. Urra,M.C. Diez,L. Guerrero,C. Palma 한국생물공학회 2012 Biotechnology and Bioprocess Engineering Vol.17 No.5

Recycling industrial wastes is one of the major goals of bioengineering research. Agricultural wastes are often rich in natural sources of organic and inorganic compounds. The present study investigates the use of banana peel waste as a non-conventional alternative to nitrogen-enriched glucose media for a white rot fungus (WRF), Inonotus sp. SP2, recently isolated in southern Chile. WRF are known to produce biodegrading enzymes,such as peroxidases, that can have industrial and biotechnological applications. To that end, the metabolic characteristics and catalytic properties of peroxidases produced by Inonotus sp. SP2 were compared between glucose and banana peel-based growth mediums. The results establish that this strain of WRF produces high concentrations of a Mn+2-dependent peroxidase, with greater enzymatic activity in extracellular fluid and crude enzyme extracted from fungus grown in banana peel and glucose media,respectively. H2O2 has an inhibiting effect that is greater for enzymes produced in glucose media, and greater biomass can be obtained in banana-peel based media. This demonstrates that banana peel is a suitable and more cost-effective alternative to conventional glucose-based media for the production of biodegradative enzymes, such as peroxidase. Unlike other strains of WRF, the metabolic characteristics of Inonotus sp. SP2 demonstrate that it enters secondary metabolism with the production oxidative enzymes after both carbon and nitrogen sources are depleted. This suggests that with further investigation, this strain of WRF may be useful in industrial applications that require the biodegradation of nitrogen and carbon-based wastes and recalcitrant compounds.

Restoration and conservation of anatomic pieces

Camila Cá,rdenas Guerrero Guzmá,n,Karen Alejandra Pé,rez Dí,az,Marí,a Paula Ruí,z Dí,az,Valentina Dí,az Sá,nchez,André,s Camilo Ariza Aguirre,Laura Catalina Can 대한해부학회 2019 Anatomy & Cell Biology Vol.52 No.3

In this study, a restoration process was developed with potassium hydroxide (KOH), in order to improve each of the structures for their posterior fixation, through the use of new methods such as the Chilean conservative fixative solution (SFCCh), with exceptional results. Restore anatomical pieces corresponding to corpse and organs, being these last set with the SFCCh. In this work dealt with processes of restoration with potassium hydroxide, sodium chloride, and sodium hypochlorite, the process began with the cleanliness and suture of the structures for subsequent fixing in Chilean conservative fixative solution, making use of a corpse and different anatomical parts. Work based on items found in the database, Elsevier, Science Direct, ProQuest, and MEDLINE. At the end of the process of restoration and conservation of the anatomical pieces, was observed an improvement in muscle pigment with decrease of rigidity in the specimen, additionally a recovery of appearance in the vascular-nervous elements was achieved. The organs were much more malleable and the structures facilitate the identification of specific details, its subsequent immersion in SFCCh allows the longer preservation of the obtained results. The restoration with potassium hydroxide allows the improvement in the appearance of the different anatomical structures and simultaneously to facilitate its study. The SFCCh is an alternative that replaces partially the use of formaldehyde. In addition, it presents toxicity reduction.

Modeling, Analysis, and Design of Stationary Reference Frame Droop Controlled Parallel Three-Phase Voltage Source Inverters

Juan C. Vasquez,Josep M. Guerrero,Mehdi Savaghebi,Remus Teodorescu 전력전자학회 2011 ICPE(ISPE)논문집 Vol.2011 No.5

Power electronics based microgrids consist of a number of voltage source inverters (VSIs) operating in parallel. In this paper, the modeling, control design, and stability analysis of three-phase VSIs are derived. The proposed voltage and current inner control loops and the mathematical models of the VSIs were based on the stationary reference frame. A hierarchical control for the paralleled VSI system was developed based on three levels. The primary control includes the droop method and the virtual impedance loops, in order to share active and reactive power. The secondary control restores the frequency and amplitude deviations produced by the primary control. And the tertiary control regulates the power flow between the grid and the microgrid. Also, a synchronization algorithm is presented in order to connect the microgrid to the grid. The evaluation of the hierarchical control is presented and discussed. Experimental results are provided to validate the performance and robustness of the VSIs functionality during Islanded and grid-connected operations, allowing a seamless transition between these modes through control hierarchies by regulating frequency and voltage, main-grid interactivity, and to manage power flows between the main grid and the VSIs.