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  1. Article: Study of Recycling Potential of FFP2 Face Masks and Characterization of the Plastic Mix-Material Obtained. A Way of Reducing Waste in Times of Covid-19.

    Crespo, Cristina / Ibarz, Gemma / Sáenz, Carlos / Gonzalez, Pablo / Roche, Sandra

    Waste and biomass valorization

    2021  Volume 12, Issue 12, Page(s) 6423–6432

    Language English
    Publishing date 2021-05-31
    Publishing country Netherlands
    Document type Journal Article
    ZDB-ID 2541900-6
    ISSN 1877-265X ; 1877-2641
    ISSN (online) 1877-265X
    ISSN 1877-2641
    DOI 10.1007/s12649-021-01476-0
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  2. Article: Comparative Analysis of SARS-CoV-2 Antibody Responses across Global and Lesser-Studied Vaccines.

    Zambrana, José Victor / Saenz, Carlos / Maier, Hannah E / Brenes, Mayling / Nuñez, Andrea / Matamoros, Anita / Hernández, Mabel / Dumas, Keyla / Toledo, Cristhian / Peralta, Leonardo / Gordon, Aubree / Balmaseda, Angel

    Vaccines

    2024  Volume 12, Issue 3

    Abstract: Few data are available on antibody response for some SARS-CoV-2 vaccines, and there is a lack of ability to compare vaccine responses in the same population. This cross-sectional study conducted in Nicaragua examines the SARS-CoV-2 antibody responses in ... ...

    Abstract Few data are available on antibody response for some SARS-CoV-2 vaccines, and there is a lack of ability to compare vaccine responses in the same population. This cross-sectional study conducted in Nicaragua examines the SARS-CoV-2 antibody responses in individuals, previously exposed to high infection rates who have received various vaccines. The vaccines under comparison include well-known ones like Pfizer (BNT162b2) and AstraZeneca (ChAdOx1-S), alongside less-studied vaccines including Soberana (Soberana 02), Abdala (CIGB-66), and Sputnik V/Sputnik Light. Overall, 3195 individuals participated, with 2862 vaccinated and 333 unvaccinated. We found that 95% of the unvaccinated were seropositive, with much lower titers than the vaccinated. Among the vaccinated, we found that Soberana recipients mounted the highest anti-spike response (mean difference (MD) = 36,498.8 [20,312.2, 52,685.5]), followed by Abdala (MD = 25,889.9 [10,884.1, 40,895.7]), BNT162b2 (MD = 12,967.2 [7543.7, 18,390.8]) and Sputnik with AstraZeneca as the reference group, adjusting for age, sex, vaccine status, days after last dose, and self-reported COVID-19. In addition, we found that subjects with complete vaccination series had higher antibody magnitude than those with incomplete series. Overall, we found no evidence of waning in the antibody magnitude across vaccines. Our study supports the conclusion that populations with high infection rates still benefit substantially from vaccination.
    Language English
    Publishing date 2024-03-19
    Publishing country Switzerland
    Document type Journal Article
    ZDB-ID 2703319-3
    ISSN 2076-393X
    ISSN 2076-393X
    DOI 10.3390/vaccines12030326
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  3. Article: Study of Recycling Potential of FFP2 Face Masks and Characterization of the Plastic Mix-Material Obtained. A Way of Reducing Waste in Times of Covid-19

    Crespo, Cristina / Ibarz, Gemma / Sáenz, Carlos / Gonzalez, Pablo / Roche, Sandra

    Waste and biomass valorization. 2021 Dec., v. 12, no. 12

    2021  

    Abstract: The purpose of this study is to investigate how to recycle FFP2 face masks used during Covid-19 pandemic without using previous sorting process and to characterize the properties of the material obtained. The way of splitting and processing the mixture ... ...

    Abstract The purpose of this study is to investigate how to recycle FFP2 face masks used during Covid-19 pandemic without using previous sorting process and to characterize the properties of the material obtained. The way of splitting and processing the mixture of materials was studied as well as the final properties such as chemical, thermal and mechanical characteristics. The resulting recycled material is a blend of polymers with such mechanical and thermal properties that could be used as an alternative to recycled PP (polypropylene). Avoidance of previous sorting process gives the face mask recycling a new and simplified way of preventing this material to be disposed in environment and an opportunity of second life for the polymers they are made of. With this work we lay the basis to reduce the plastic pollution related with the recommended use of face masks during Covid-19 pandemic.
    Keywords COVID-19 infection ; biomass ; face ; face masks ; pollution ; polypropylenes ; wastes
    Language English
    Dates of publication 2021-12
    Size p. 6423-6432.
    Publishing place Springer Netherlands
    Document type Article
    ZDB-ID 2541900-6
    ISSN 1877-265X ; 1877-2641
    ISSN (online) 1877-265X
    ISSN 1877-2641
    DOI 10.1007/s12649-021-01476-0
    Database NAL-Catalogue (AGRICOLA)

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  4. Article: Diffuse irradiance on tilted planes in urban environments: Evaluation of models modified with sky and circumsolar view factors

    García, Ignacio / de Blas, Marian / Hernández, Begoña / Sáenz, Carlos / Torres, José Luis

    Renewable energy. 2021 Dec., v. 180

    2021  

    Abstract: Numerous studies have analyzed existing irradiance models for estimating sky diffuse irradiance on tilted planes. However, few have evaluated the suitability of these models for estimating irradiance in obstructed environments, specifically considering ... ...

    Abstract Numerous studies have analyzed existing irradiance models for estimating sky diffuse irradiance on tilted planes. However, few have evaluated the suitability of these models for estimating irradiance in obstructed environments, specifically considering the effects of obstacles. In this study, three irradiance models —one of them with five variants— for estimating diffuse irradiance on tilted planes located in urban environments were evaluated. All models have been adapted to consider the effect of an urban canyon on the diffuse irradiance received on a tilted plane through the sky view factor and the circumsolar view factor. All the models were evaluated against the diffuse irradiance values obtained by the ISO 15469:2004(E)/CIE S 011/E:2003 angular distribution model. Therefore, it was necessary to determine the standard sky type corresponding to each record of the measurements performed by a sky scanner at the radiometric station of UPNA (Spain). A total of 4,864 scenarios were considered to occur from the combination of different orientations and inclinations of the plane, and different orientations and aspect ratios of the urban canyon. The results revealed that the Perez model considering a 35° half-angle circumsolar region has the best performance, followed by the Perez model considering a 45° half-angle circumsolar region.
    Keywords light intensity ; models ; radiometry ; renewable energy sources ; scanners ; Spain
    Language English
    Dates of publication 2021-12
    Size p. 1194-1209.
    Publishing place Elsevier Ltd
    Document type Article
    ZDB-ID 2001449-1
    ISSN 1879-0682 ; 0960-1481
    ISSN (online) 1879-0682
    ISSN 0960-1481
    DOI 10.1016/j.renene.2021.08.042
    Database NAL-Catalogue (AGRICOLA)

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  5. Book ; Online: Analysis of the influence of political polarization in the vaccination stance

    Ebeling, Régis / Sáenz, Carlos Abel Córdova / Nobre, Jeferson / Becker, Karin

    the Brazilian COVID-19 scenario

    2021  

    Abstract: The outbreak of COVID-19 had a huge global impact, and non-scientific beliefs and political polarization have significantly influenced the population's behavior. In this context, COVID vaccines were made available in an unprecedented time, but a high ... ...

    Abstract The outbreak of COVID-19 had a huge global impact, and non-scientific beliefs and political polarization have significantly influenced the population's behavior. In this context, COVID vaccines were made available in an unprecedented time, but a high level of hesitance has been observed that can undermine community immunization. Traditionally, anti-vaccination attitudes are more related to conspiratorial thinking rather than political bias. In Brazil, a country with an exemplar tradition in large-scale vaccination programs, all COVID-related topics have also been discussed under a strong political bias. In this paper, we use a multidimensional analysis framework to understand if anti/pro-vaccination stances expressed by Brazilians in social media are influenced by political polarization. The analysis framework incorporates techniques to automatically infer from users their political orientation, topic modeling to discover their concerns, network analysis to characterize their social behavior, and the characterization of information sources and external influence. Our main findings confirm that anti/pro stances are biased by political polarization, right and left, respectively. While a significant proportion of pro-vaxxers display haste for an immunization program and criticize the government's actions, the anti-vaxxers distrust a vaccine developed in a record time. Anti-vaccination stance is also related to prejudice against China (anti-sinovaxxers), revealing conspiratorial theories related to communism. All groups display an "echo chamber behavior, revealing they are not open to distinct views.

    Comment: Accepted for the AAAI 16th International Conference on Web and Social Media (ICWSM 2022), and to be published in the ICWSM 2022 Proceedings. Please, cite the proceedings
    Keywords Computer Science - Social and Information Networks
    Publishing date 2021-10-07
    Publishing country us
    Document type Book ; Online
    Database BASE - Bielefeld Academic Search Engine (life sciences selection)

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  6. Book ; Online: On Requirements for Programming Exercises from an E-learning Perspective

    Loria-Saenz, Carlos

    2009  

    Abstract: In this work, we deal with the question of modeling programming exercises for novices pointing to an e-learning scenario. Our purpose is to identify basic requirements, raise some key questions and propose potential answers from a conceptual perspective. ...

    Abstract In this work, we deal with the question of modeling programming exercises for novices pointing to an e-learning scenario. Our purpose is to identify basic requirements, raise some key questions and propose potential answers from a conceptual perspective. Presented as a general picture, we hypothetically situate our work in a general context where e-learning instructional material needs to be adapted to form part of an introductory Computer Science (CS) e-learning course at the CS1-level. Meant is a potential course which aims at improving novices skills and knowledge on the essentials of programming by using e-learning based approaches in connection (at least conceptually) with a general host framework like Activemath (www.activemath.org). Our elaboration covers contextual and, particularly, cognitive elements preparing the terrain for eventual research stages in a derived project, as indicated. We concentrate our main efforts on reasoning mechanisms about exercise complexity that can eventually offer tool support for the task of exercise authoring. We base our requirements analysis on our own perception of the exercise subsystem provided by Activemath especially within the domain reasoner area. We enrich the analysis by bringing to the discussion several relevant contextual elements from the CS1 courses, its definition and implementation. Concerning cognitive models and exercises, we build upon the principles of Bloom's Taxonomy as a relatively standardized basis and use them as a framework for study and analysis of complexity in basic programming exercises. Our analysis includes requirements for the domain reasoner which are necessary for the exercise analysis. We propose for such a purpose a three-layered conceptual model considering exercise evaluation, programming and metaprogramming.

    Comment: ii + 31 pages
    Keywords Computer Science - Artificial Intelligence
    Subject code 004
    Publishing date 2009-03-04
    Publishing country us
    Document type Book ; Online
    Database BASE - Bielefeld Academic Search Engine (life sciences selection)

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  7. Book ; Online ; Thesis: Influence of spectral fine structure on the electronic transport of icosahedral quasicrystals

    Landauro Sáenz, Carlos V

    2002  

    Author's details vorgelegt von Carlos V. Landauro Saenz
    Keywords Quasikristall ; Elektronischer Transport ; Transportkoeffizient ; Ab-initio-Rechnung ; Übergangsmetall
    Language English
    Size Online-Ressource
    Document type Book ; Online ; Thesis
    Thesis / German Habilitation thesis Techn. Univ., Diss--Chemnitz, 2002
    Database Former special subject collection: coastal and deep sea fishing

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  8. Book: On requirements for programming exercises from an e-learning perspective

    Loría-Sáenz, Carlos

    (SEKI working paper ; 2008,1)

    2008  

    Author's details Carlos Loría-Sáenz. Universität des Saarlandes, Fachrichtung Informatik
    Series title SEKI working paper ; 2008,1
    Language English
    Size 31 S., graph. Darst., 30 cm
    Publisher Univ., Fachrichtung Informatik
    Publishing place Saarbrücken
    Document type Book
    Note Literaturverz. S. 28 - 31
    Database Library catalogue of the German National Library of Science and Technology (TIB), Hannover

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  9. Article ; Online: Emergency Abdominal Laparoscopic Surgery During the Coronavirus Disease 2019 Pandemic: Experience in a Private Center in Peru.

    Carpio Colmenares, Yahaira Tatiana / Cárdenas Ruiz de Castilla, Daniel / García Barrionuevo, Luis Alcides / Li Valencia, Miguel Roberto / Mansilla Doria, Percy / Martinez Nole, Victor / Palomino Escalante, Fiorella / Roncalla Saenz, Carlos / Borda-Luque, Giuliano

    Journal of laparoendoscopic & advanced surgical techniques. Part A

    2020  Volume 31, Issue 3, Page(s) 261–265

    Abstract: Background: ...

    Abstract Background:
    MeSH term(s) Adolescent ; Adult ; Aged ; Aged, 80 and over ; COVID-19/epidemiology ; Child ; Child, Preschool ; Comorbidity ; Digestive System Diseases/epidemiology ; Digestive System Diseases/surgery ; Elective Surgical Procedures/statistics & numerical data ; Emergencies ; Emergency Service, Hospital/statistics & numerical data ; Female ; Humans ; Incidence ; Laparoscopy/statistics & numerical data ; Male ; Middle Aged ; Pandemics ; Peru/epidemiology ; Retrospective Studies ; SARS-CoV-2 ; Young Adult
    Language English
    Publishing date 2020-12-14
    Publishing country United States
    Document type Journal Article
    ZDB-ID 1381909-4
    ISSN 1557-9034 ; 1092-6429
    ISSN (online) 1557-9034
    ISSN 1092-6429
    DOI 10.1089/lap.2020.0917
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    Zs.A 3246: Show issues Location:
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    Jg. 1995 - 2021: Lesesall (2.OG)
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  10. Article ; Online: Implementation of rapid diagnostics assays for detection of histoplasmosis and cryptococcosis in central american people living with HIV.

    Caceres, Diego H / Arauz, Ana B / Flores, Carlos / Santiago, Erika / Montoya, Sandra / Saenz, Carlos / Torres-Meneses, Felipe A / Peralta, Hortencia / Zuniga-Moya, Julio Cesar / Lainez Arteaga, Isis Zohar / Garcia, Arturo / Abdo, Jose / Verweij, Paul E / Chiller, Tom M / Forno, Diana

    Mycoses

    2021  Volume 64, Issue 11, Page(s) 1396–1401

    Abstract: Objectives: Histoplasmosis and cryptococcosis are important public health problems in people living with HIV (PLHIV) in Central America. Conventional laboratory assays, based on microscopy and culture, are not optimal for the diagnosis of either disease. ...

    Abstract Objectives: Histoplasmosis and cryptococcosis are important public health problems in people living with HIV (PLHIV) in Central America. Conventional laboratory assays, based on microscopy and culture, are not optimal for the diagnosis of either disease. However, antigen (Ag) assays are rapid and highly accurate for the diagnosis of these infections.
    Methods: Laboratory surveillance of PLHIV was carried out in four hospitals in Panama, Honduras and Nicaragua, between 2015 and 2019. Detection of Histoplasma antigens in urine was performed by enzyme immunoassay (EIA), and Cryptococcus antigen detection in sera and cerebrospinal fluid specimens was performed by lateral flow assay (LFA).
    Results: A total of 4,453 PLHIV with clinical suspicion of histoplasmosis (n = 1,343) or cryptococcosis (n = 3,110; 2,721 sera and 389 CSF) were tested. Of 1,343 patients suspected of having histoplasmosis, 269 (20%) were Histoplasma Ag positive. Of 3,110 patients tested using the Cryptococcus Ag assay, 329 (11%) were positive. Honduras reported the highest positivity rates (32% for Histoplasma Ag, and 16% for Cryptococcus Ag); Panama reported the largest number of patients testing positive using the Histoplasma Ag assay (n = 201); and Nicaragua reported the largest number of patients testing positive using the Cryptococcus Ag assay (n = 170).
    Conclusion: Here, we show how the implementation of rapid diagnostics assays impacted case detection and was useful for the care of people with advanced HIV. Rapid and accurate diagnosis could reduce mortality associated with histoplasmosis and cryptococcosis in PLHIV.
    MeSH term(s) Adult ; Antigens, Fungal/blood ; Antigens, Fungal/cerebrospinal fluid ; Antigens, Fungal/urine ; Cryptococcosis/diagnosis ; Cryptococcus/immunology ; Female ; Flow Cytometry ; HIV Infections/complications ; Histoplasma/immunology ; Histoplasmosis/diagnosis ; Honduras ; Humans ; Immunoenzyme Techniques ; Male ; Nicaragua ; Panama
    Chemical Substances Antigens, Fungal
    Language English
    Publishing date 2021-05-24
    Publishing country Germany
    Document type Journal Article
    ZDB-ID 392487-7
    ISSN 1439-0507 ; 0933-7407
    ISSN (online) 1439-0507
    ISSN 0933-7407
    DOI 10.1111/myc.13303
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