bluuebunny/crossref_metadata_2025 huggingface dataset:
Tuben: Re-introducing a computer program by Liljencrants and Fant (1975) for simulating vocal tract area transfer functions
Authors: Ekström Axel G. , Beskow Jonas
Published: April 2023

Liljencrants and Fant (1975) designed a computer program for modelling vocal tract area transfer functions as sequences of rounded tubes. Here, we present Tuben, an updated version of the program, written in the Python programming language. We present a use case of the program, replicating vocal tract shapes for point vowels /a/, /i/, and /u/. The program has been made publicly available and presents researchers and students in speech-centric sciences with easily accessible vocal tract modelling and vowel synthesis.
KONSEP DAN TEORI UANG DALAM PERSPEKTIF ISLAM
Authors: Sumirah R.R. Dhewi Putri Ayu
Published: April 2023

Uang merupakan objek yang berperan penting dalam perekonomian. uang merupakan media yang digunakan untuk memperlancar transaksi ekonomi dalam kehidupan manusia. dalam ekonomi islam uang harus mengalir dan beredar di masyarakat atau tidak boleh diendap ataupun ditimbun. dalam ekonomi islam, uang memiliki fungsi utama sebagai alat tukar dan alat satuan hitung.
Ammonia emissions from a dairy housing and a wastewater treatment plant quantified with an inverse dispersion method accounting for deposition loss
Authors: Valach Alex
Published: April 2023

Ammonia (NH3) emissions negatively impact air, soil, and water quality, hence human health and biodiversity. Significant emissions, including the largest sources, originate from single or multiple structures, such as livestock facilities and wastewater treatment plants (WWTPs). The inverse dispersion method (IDM) is effective in measuring total emissions from such sources, although depositional loss between the source and point of measurement is often not accounted for. We applied IDM with a deposition correction to determine total emissions from a representative dairy housing and WWTP during several months in autumn and winter in Switzerland. Total emissions were 1.19 ± 0.48 and 2.27 ± 1.53 kg NH3 d-1 for the dairy housing and WWTP, respectively, which compared well with literature values, despite the paucity of WWTPs data. A concurrent comparison with an inhouse tracer ratio method at the dairy housing indicated an offset of the IDM emissions by <20%. Diurnal emission patterns were evident at both sites mostly driven by changes in air temperature with potential lag effects such as following sludge agitation. Modelled deposition corrections to adjust the concentration loss detected at the measurement point with the associated footprint were 22-28% of the total emissions and the cumulative fraction of deposition to emission modelled with distance from the source was between 7-12% for the measurement distances (60-150 m). Although estimates of depositional loss were plausible, the approach is still connected with substantial uncertainty, which calls for future validation measurements. Longer measurement periods encompassing more management activities and environmental conditions are required to assess predictor variable importance on emission dynamics. Combined, IDM with deposition correction will allow the determination of emission factors at reduced efforts and costs, thereby supporting the development and assessment of emission reducing methods and expand the data availability for emission inventories.
Estimating cooling capacities from aerial images using convolutional neural networks
Authors: Barth Florian , Schüppler Simon , Menberg Kathrin , Blum Philipp
Published: April 2023

In recent decades, the global cooling demand has significantly increased and is expected to grow even further in the future. However, knowledge regarding the spatial distribution of cooling demand is sparse. Most existing studies are based on statistical modelling, which lack in small-scale details and cannot accurately identify individual large cooling producers. In this study, we implement and apply a novel method to identify, map and estimate nominal cooling capacities of chillers using deep learning. Chillers typically use air-cooled condensers and cooling towers to release excess heat, and produce most of the cooling needs in the commercial and industrial sectors. In this study, these units are identified from aerial images using specifically trained object detection models. The corresponding nominal cooling capacity is then estimated based on the number of fans of air-cooled condensers and the fan diameters of the cooling towers, respectively. Both detection and capacity estimations are first evaluated on test data sets and subsequently applied to an industrial area (Brühl) and the city center in Freiburg, Germany. In Brühl, aerial images show chillers with an estimated nominal cooling capacity of 201 MW, of which the model detected 88%, while 92% of all detections are correct. In the city center, a nominal capacity of 18.6 MW is estimated, of which the model detected 87% with 77% of all detections being correct. Hence, the developed approach facilitates a reliable analysis of the installed nominal cooling capacity of individual buildings at large scales, such as districts and cities. This information could be further used to locate areas for investments and support planning of eco-friendly, centralized supply of cooling energy, for example district heating and cooling systems or shallow geothermal energy systems such as aquifer thermal energy storage (ATES).
Co-Development of Group Integration, Loneliness, and Mental Health within the School Context
Authors: Krüger Heike , Krause Robert
Published: April 2023

Background: Whereas loneliness is the subjective perception that the personal network lacks in quality or quantity, social isolation refers to the objective absence of supportive relationships. Embeddedness in peer networks and the absence of loneliness facilitate mental health in adolescence by creating stability and predictability in life. The association is of a bidirectional nature. Poor mental health can impact the ability to maintain social relationships with classmates or form new ones and is related to cognitive distortions which influence satisfaction with social relationships.Objective: This study aimed to investigate the co-development of social isolation, loneliness, and mental health within the school context. Using a measurement of social integration, which is less prone to cognitive distortion, it focuses on the feedback processes between network structure, structural positions within peer networks, and changes in individuals' loneliness and mental health.Method: The question was examined using the first two waves of the SOCIALBOND study, an ERC-funded longitudinal survey of German schools. Annual data collection started in grade eight. Over 3,000 students were interviewed at 37 schools. Based on the Social Cognitive Mapping approach, clique networks are captured by aggregating the perceptions of all pupils in the cohort. Stochastic actor-based models for network dynamics were estimated, modeling the co-evolution of social isolation, loneliness, and mental health. The RSiena grade level models were systematically combined in a meta-analysis to detect general tendencies.Results: The average level of mental health and loneliness of those with whom ego spends time at school influence egos development of the respective traits. However, our study provides no indication for selection effects within the school grade.
Is loss aversion context specific? Theory and evidence from an experiment with decoys
Authors: Ganoulis Alessandro
Published: April 2023

Using new experimental data, this paper finds evidence that contextual factors can affectobserved loss sensitivity. Participants in an experiment of hypothetical lotteries made choicesthat were systematically affected by the presence of decoy gambles. Following previousliterature in cognitive psychology, a theoretical model is proposed in which people encode newinformation comparing it to similar experiences retrieved from memory. In the so called“editing phase” of decision making, individuals are thought to weight more gains or losses thatstand out compared to what they experienced in previous lotteries, including the decoy lotteries.Using different empirical methods, the hypothesis that loss sensitivity does not vary with thedistribution of the decoys can be rejected. The participants that were presented with decoyswith higher gains and lower losses behaved as if they were mildly loss averse. Those presentedwith lower gains and higher losses appear to have been loss neutral. Pooling the two groupstogether, the mean and median estimates suggest a very mild but statistically significant lossaversion.
Homenaje a César Vallejo en España
Authors: Flores Heredia Gladys
Published: April 2023

La tradición crítica española ha dado a los estudios sobre la obra de César Vallejo notables contribuciones que se encuentran desperdigadas en libros, prólogos, notas, artículos, varias tesis universitarias y la elaboración de ediciones de los distintos poemarios del vate santiaguino. La realización del III Congreso Internacional Vallejo Siempre 2018 en Salamanca, España, es un motivo propicio para reflexionar sobre el estado de la cuestión vallejiana en la comunidad académica española, tanto como para intercambiar conocimientos sobre las investigaciones que se realizan en distintas partes del mundo. Este homenaje a Vallejo en España es la continuación de las bienales vallejianas iniciadas e institucionalizadas en la ciudad de Lima en el marco del Congreso Internacional Vallejo Siempre 2014, y que tuvo continuidad en la ciudad de Montevideo, con el Congreso Internacional Vallejo Siempre 2016. Y así como en esos certámenes fueron ejemplares el quijotismo vallejiano de Francisco Távara Córdova (Perú) y el lirismo heraldiano de Andrés Echevarría (Uruguay), esta versión española del congreso se debe íntegramente a la medular humanidad de Gonzalo Santonja Gómez-Agero, el hacedor.
Trilce XXXVIII: arte poética de la evolución
Authors: Moran Dominic
Published: April 2023

El presente ensayo complementa mi trabajo «Algo más sobre las fuentes de Trilce XXXVI» (publicado como parte de las Actas del Congreso Internacional Vallejo Siempre [Lima, 2014]) y pretende demostrar que Trilce XXXVIII («Este cristal aguarda ser sorbido») es una específica y concentrada respuesta poética a la lectura de Vallejo de los trabajos de Darwin y Haeckel. Postula, en particular, que la aparentemente extraña y a la vez elaboradamente desarrollada idea de una «boca venidera / sin dientes» que un día ingerirá cristal «en bruto» deriva de manera directa del encuentro y acercamiento que Vallejo guardó con la teoría de la evolución; asimismo, revela y proporciona coherencia a la completitud de un poema que ha desconcertado y dividido por igual a los críticos de Vallejo dando lugar a una enconada variedad de lecturas.
Vallejo migrante y la diáspora poética latinoamericana
Authors: Mazzotti José Antonio
Published: April 2023

Para nadie es un secreto que el itinerario geográfico de César Vallejo fue no solo variado, sino accidentado. De su natal Santiago de Chuco había que viajar cuatro horas a lomo de caballo hasta la ciudad costeña de Trujillo (donde concluyó su bachillerato en Letras) y luego a Lima (generalmente en barco). Una vez en la capital peruana, hacia 1915, Vallejo intentó ser aceptado en los círculos literarios con relativo éxito, sobre todo después de la publicación de Los heraldos negros en 1918- 1919. Sin embargo, una vez aparecido Trilce en 1922, muchas puertas se le cerraron, y hasta se vio implicado antes de ello en un conflicto policial que le valió casi cuatro meses de cárcel. Como consecuencia, el poeta partió para París en 1923, golpeado y amargado del Perú, para nunca más volver. Esta ponencia examina cómo la continua condición migrante del poeta resume y explica parcialmente el conflicto de millones de latinoamericanos durante su tiempo y a lo largo del siglo XX. Más específicamente, me interesa notar la internalización de esa experiencia y las formas en que se manifiesta en su poesía inicial, la de la llamada etapa peruana, así como algunas de las huellas que ha dejado en la producción poética más reciente.
Vallejo y Agamben: la potencia de la palabra nueva
Authors: Quenaya Carlos
Published: April 2023

A grandes rasgos nos proponemos seguir la indicación del filósofo italiano Giorgio Agamben y explorar, a partir del marco de su «poética de la inoperosidad», la epistemología de Trilce. Intentaremos, pues, hacer visible la recepción de Vallejo en el pensamiento político y estético del autor italiano y, paralelamente, sugerir otras posibilidades epistémicas y políticas presentes en el poemario de 1922, con el fin de ampliar el marco de la reflexión agambeniana. En tanto crítica de la concepción metafísica del lenguaje, Trilce sería un preclaro ejemplo de liberación de las potencias de la lengua. En tanto apelación a un nuevo lector, su fuerza performática supondría la instauración de un comienzo, un acontecimiento puesto en marcha por su palabra nueva.
César Vallejo: un cáliz hacia la inmortalidad
Authors: Manuel Chávez Juan
Published: April 2023

La Abadía de Montserrat es un lugar en las montañas de la provincia de Barcelona, en España, con una historia que se remonta a un milenio atrás. Entre turistas y peregrinos, cada año llegan en promedio tres millones de personas; el número representa las tres cuartas partes de los turistas extranjeros que visitaron el Perú en 2017. Este nivel de atención se explica no solamente por los caprichos geológicos del paisaje, con rocas en pie que simulan frailes aglomerados y la monumentalidad arquitectónica del monasterio benedictino con sus arcos verticales, sino porque ahí se conserva a La Moreneta, Virgen negra que es la patrona de Cataluña. Se custodia, también, un libro del poeta César Vallejo.
Estructura de «Canciones de hogar» de Los heraldos negros
Authors: Lozano Alvarado Saniel
Published: April 2023

«Canciones de hogar», la sección más breve de Los heraldos negros, está compuesta por cinco poemas, cuatro de los cuales se desarrollan en el contexto del hogar, en un ambiente íntimo y familiar, de marcado carácter subjetivo, anímico y espiritual, casi siempre dominado por la imagen del padre. La dimensión lineal del tiempo combina el presente con el pasado, con un fuerte carácter psicológico. La integración de las tres magnitudes —presente, pasado y futuro— solo se da en el poema «Enereida». La perspectiva de construcción de los poemas es personal, como algo primordial que le ocurre, siente y preocupa al propio enunciador; por tanto, las demás personas no se sienten o no nos consideramos representados. El título es connotativo y bisémico, pues estrictamente no alude a ninguna canción o melodía, sino al ambiente íntimo y hogareño, transido de nostalgia, lejanía, añoranza y también de presagio de la muerte inexorable. Los posibles significados destacan el valor del hogar, el amor al padre, la ausencia del hermano, la sensación de vacío y soledad. El lenguaje parte de un sustrato popular, pero dotado de una riqueza artística admirable.
Constantes temáticas y expresivas entre Los heraldos negros y el resto de la obra vallejiana
Authors: González Montes Antonio
Published: April 2023

Considerando que la totalidad de la obra escrita de César Vallejo ha sido leída y analizada por la crítica literaria nacional e internacional, nos proponemos resaltar la importancia de Los heraldos negros (1919) en el conjunto de dicha obra y subrayar las constantes temáticas y expresivas entre el citado poemario y la producción vallejiana en verso y en prosa, literaria, académica y periodística. En este trabajo utilizaremos la categoría de la intertextualidad para establecer con precisión y en forma fundamentada las conexiones que existen entre el libro de 1919 y las obras que el autor publicó en vida y las que han sido editadas póstumamente, haciendo que el corpus literario se haya incrementado de modo significativo. Como corresponde, consultaremos exhaustivamente la bibliografía relevante acerca de dicho tema.
Los heraldos negros: «fermento[s] de Sol»
Authors: Granados Pedro José
Published: April 2023

En «Nostalgias imperiales»: «[Yo soy] Un fermento de Sol / ¡levadura de sombra y corazón!» («Huaco»), de Los heraldos negros (LHN), la palabra «fermento» —vinculada al «Sol» actuando en la «sombra y corazón»— resulta semejante, aunque no equivalente, a fragmento. En este sentido, y tal como estudiamos en nuestro libro Trilce: húmeros para bailar (2014), el poemario de 1922 no se hallaría «fragmentado» o constituido de «fragmentos» (vanguardia histórica europea), sino, más bien, fermentado o «fermentando» (Inkarrí). Los «heraldos», en tanto «fermentos [de Sol]» de LHN, constituirían una comunidad (jardín de Epicuro) o archipiélago andino susceptible —aunque ya opaco o mestizo— de extenderse de manera universal. Una reflexión específica y concentrada —«escena cerebro»— de lo mismo (naturaleza y función de los «fragmentos») la constituiría Trilce. Es por tal motivo que este poemario resulta más «abstracto» o «teórico» que LHN. Por su parte, España, aparta de mí este cáliz, constituiría un señalamiento y reconocimiento explícito —ya universal y multitemporal, en «[Niños] si tardo»— de aquel mismo archipiélago andino, simétrico y, acaso, esta vez un tanto más evangélico o menos «pagano» (pensamiento amerindio o epicúrico) que Trilce. Por lo tanto, postulamos que «los heraldos» son «negros», al modo de aquel enterrado y activo «fermento[s] de Sol» del poema «Huaco»; «niños»: traviesos, manchados, embarrados. Y, además, «levadura» en cuanto «niños» como significado de promesa, primicia o futuro de un mundo siempre perfectible. Niños que sobrevivirán al aborto (Trilce) o a las balas (España, aparta de mí este cáliz) en un ayllu multicultural, multinacional, multitemporal y multidimensional donde la vida alienta un continuum.
La visión del mundo como medio de exploración interior: una lectura de Los heraldos negros de César Vallejo
Authors: Mudarra Montoya Américo
Published: April 2023

En algunos poemas de Los heraldos negros (1919), primer conjunto publicado por César Vallejo, existe una predisposición por parte del sujeto lírico para valerse del sentido de la vista como el medio con el que se propicia la identificación, en distintos grados, con aquellos elementos que lo rodean. En ese sentido, es posible reconocer dos operaciones distintas: en una, la visión del elemento enfocado despierta una reacción interior en el observador; en la otra, la visión del elemento observado le revela una íntima verdad personal al protagonista. Los elementos, entonces, se comportan como recursos para que el sujeto lírico, que se trata de una proyección del poeta, sepa más de sí conforme interpreta y comprende a su entorno. Para demostrar esta lectura, en nuestro trabajo se procederá a analizar los poemas «Deshojación sagrada», «La araña», «La de a mil» y «Las piedras».
Presentación
Authors: Rodríguez Chávez Iván
Published: April 2023

En este 2020, doloroso, demoledor e infausto por las atroces consecuencias de la pandemia ocasionada por la COVID-19, conmemoramos cien años de este nefasto suceso. Por este motivo, la Universidad Ricardo Palma, el Fondo Editorial del Poder Judicial, el Vicedecanato de Investigación y Posgrado de la Facultad de Letras y Ciencias Humanas de la Universidad Nacional Mayor de San Marcos, el Instituto de Estudios Vallejianos de la Universidad Nacional de Trujillo, el Centro de Estudios Vallejianos, y Capulí, Vallejo y su Tierra organizaron el coloquio «Centenario del proceso judicial seguido contra el poeta César Vallejo», desarrollado virtualmente los sábados 7, 14, 21 y 28 de noviembre.
Narrar el encierro: «Liberación», un cuento trágico y carcelario de Escalas de César Vallejo
Authors: Barreto Quiche Miguel Ángel
Published: April 2023

El presente trabajo tiene como finalidad desarrollar un análisis textual de «Liberación», un cuento que forma parte de las narraciones de César Vallejo reunidas bajo el título de Escalas (1923), obra impresa en los Talleres Tipográficos de la Penitenciaría de Lima. En «Liberación» notamos tópicos comunes para la construcción narrativa de la experiencia carcelaria, tales como la injusticia, la memoria y el miedo. Observamos que estos tópicos metaforizan la reclusión como un espacio insufrible y desesperanzador, principalmente para Jesús Palomino, el protagonista, cuyos estados trágicos o perturbaciones psicológicas se incrementan producto del confinamiento. Nuestro análisis se concentra en explorar al protagonista en las escenas en que influyen estos tres tópicos.
La desnaturalización de la instrucción en el proceso Vallejo
Authors: Nava Flores Jesús Marcelo
Published: April 2023

El proceso judicial seguido contra César Vallejo es uno de los casos más icónicos de nuestro ordenamiento jurídico, pues no solo derivó en el encierro de nuestro poeta universal, sino que se llevó a cabo cuando se estaban reformando los cimientos de nuestro sistema penal. En otras palabras, el proceso era una oportunidad para demostrar que nuestro sistema penal evolucionó del sistema inquisitivo al acusatorio. Lamentablemente, se comprobó lo contrario: a pesar del cambio de código, los presupuestos inquisitivos se aplicaron injustamente contra nuestro poeta universal con el propósito de asegurar su encierro durante la etapa instructiva del proceso, es decir, antes del juicio oral pertinente para determinar su inocencia. En ese sentido, el presente artículo busca demostrar cómo se atentó contra el propósito de dicha primera etapa.
Existencia y muerte: aproximación filosófica a la poesía de César Vallejo y Vicente Aleixandre
Authors: Kouadio Djoko Luis Stéphane
Published: April 2023

Las escrituras poéticas del vate español Vicente Aleixandre y el peruano César Vallejo se caracterizan por tratar temas de los filósofos existencialistas respecto de la condición humana marcada por la muerte. Ambos poetas, aunque pertenecen a espacios diferentes, están unidos en la expresión del lirismo y el compromiso sociopolítico, que remite a una llamada a la responsabilidad ante los problemas que surgen de la condición humana.
Presentación
Authors: Rodríguez Chávez Iván
Published: April 2023

El octavo número de Archivo Vallejo. Revista de Investigación del Rectorado de la Universidad Ricardo Palma reúne la segunda parte de las ponencias presentadas en el IV Congreso Internacional «Vallejo Siempre» (Nueva York, 30 de septiembre-2 de octubre de 2021).
Trilce, el deseo del acto
Authors: Rowe William
Published: April 2023

Si bien varios poemas de Trilce parecen indicar un horizonte de espera utópica, una lectura atenta encuentra, más bien, que la esperanza está condicionada por la dificultad de acceder al acto. No hay imagen o propuesta del acto, sino presentación del subsuelo del que tendría que emerger el acto en tanto acto ético. Tal subsuelo consiste en el tiempo molecular que caracteriza el libro en su totalidad y que constituye una destrucción del tiempo-espacio moderno. Entonces, el acto estaría precedido por cierta anulación de la realidad existente. El acto atraviesa aquello sin forma; el deseo del acto en Trilce incluye la anulación de la separación del arte y la vida.
Los mapas de Vallejo en Trilce
Authors: Del Rosario Angleró Margarita
Published: April 2023

Una primera lectura de Trilce causa completo desconcierto, y queda claro que ese desasosiego es uno de los rasgos de su sentido estético. El trazo de un «mapa» poético de Vallejo podría iluminar o guiar a los lectores ante el sentido de desorientación que se experimenta en la lectura de sus poemas. Si bien Vallejo no marca un mapa visual en la página o lienzo como otros poetas vanguardistas, en Trilce el mapa está esbozado por palabras que aluden a la geografía de un lugar incierto: cuerpo, casa, cárcel, por nombrar solo algunos. En ese sentido, en el presente artículo se esboza un posible mapa de los poemas «XIX», «XXXVI», «Trilce», así como su relación con el poemario España, aparta de mi este cáliz.
César Vallejo y la escenificación de las ideologías: hacia una nueva estética de lo real
Authors: Merino Antonio
Published: April 2023

El universo vallejiano, en el que se incluye biografía, obras, crítica literaria, estudios, ediciones y publicaciones, es complejo y contradictorio. Cuando hablamos, por ejemplo, de sus primeras lecturas o incursiones en las obras de Vallejo, como es el caso de El romanticismo en la poesía castellana (1915), se está definiendo una metodología de trabajo que recorre todo el viejo discurso del positivismo de Comte, S. Mill o de H. Taine, reforzado por las lecturas de Schlegel, Le Bonn, Menéndez Pidal, Dante, Petrarca, Byron y Schiller, que cimientan su conocimiento de la realidad literaria y que, con los años, le abrirá las puertas hacia un nuevo «vanguardismo» no exento de caídas formales.
El Expediente Vallejo: la retórica judicial de César Vallejo y nuevos aportes genético-críticos sobre su estadía en la cárcel
Authors: Flores Heredia Gladys
Published: April 2023

La vida y la obra del poeta peruano César Vallejo (1892-1938) gozan de una amplia atención de la crítica literaria. Durante el siglo XX, y en estas primeras décadas del siglo XXI, se ha conservado el flujo constante de la ««vallejística»», esto es, la producción crítica centrada en las múltiples facetas de Vallejo: el hombre, el poeta, el narrador, el dramaturgo, el cronista y el ensayista. Pese a que las interpretaciones se renuevan con novedosos enfoques metodológicos, y pese también a que el interés histórico-biográfico ofrece importantes visiones de síntesis, existe un episodio en la vida de Vallejo cuyo estudio aún no se ha realizado con profundidad: se trata de su internamiento y permanencia en la cárcel de Trujillo por 112 días, entre el 6 de noviembre de 1920 y el 26 de febrero de 1921. Nuestra investigación reconoce que los principales biógrafos nacionales e internacionales han difundido este acontecimiento de carácter traumático en la vida del poeta, pero lo han hecho repitiendo una estructura de sucesos, sin tener acceso al conjunto de los folios penales en los que Vallejo alega sobre su defensa empleando recursos retóricos propios del derecho, tanto como los testimonios de quienes lo acusan. En ese sentido, la importancia de nuestra investigación radica en que será la primera vez que se sistematicen, analicen e historien los recursos jurídicos que hace más de un siglo redactó Vallejo para que lo liberen y que recientemente se ha publicado en el segundo tomo del libro Expediente Vallejo. Proceso penal seguido contra el poeta César Vallejo (Lima: Fondo Editorial del Poder Judicial del Perú, 2021). De esta manera, contribuiremos con enriquecer el conocimiento y la comprensión de uno de los pasajes de la vida del poeta, tramo vital harto conocido pero escasamente explicado, demostrado y cotejado con fuentes documentales de la época.
Corrosion Performance of Damaged Thermally Sprayed Aluminum in Simulated Deep Sea Environment
Authors: Paul S.
Published: April 2023

Thermally sprayed aluminum (TSA) has been used in offshore applications for decades, protecting steel structures from seawater corrosion. However, very little work is reported on the performance of TSA when damaged, particularly in deep sea applications. This paper presents the results of a study in which an arc-sprayed aluminum-coated steel sample was subjected to synthetic seawater at 5 °C for 30 days in an autoclave at 50 MPa to simulate 5000 m of water pressure. Discontinuities or “holidays” amounting to 3% of the sample area were drilled into the coatings, exposing the underlying steel to direct attack by the synthetic seawater. After testing, SEM and EDX analysis revealed the formation of a protective Mg-based layer on the exposed steel with negligeable calcium content and no visible corrosion products. The results indicate that TSA coatings can protect steel in deep sea environments even when damaged.
Introduction of Micro Resin Fragments with Ceramic Nanoparticles into Plasma Flame to Create Fine Coated Layers
Authors: Katsuki M. , Harada H. , Kirihara S.
Published: April 2023

This paper introduces a new way to inject nanoparticles into a plasma flame and demonstrates its use in the deposition of dense ceramic coatings. Instead of suspensions or pastes, nanoparticles are dispersed in micro resin fragments. In this case, zirconia particles with an average diameter of 200 nm were mixed with a thermosetting acrylic liquid resin and the mixture was solidified, crushed, and screened. Micro resin fragments are fed into the plasma flame using a conventional powder feeder. The resin content mostly burns away in the plasma jet, which heats and propels the nanoparticles into the substrate. SEM analysis of the zirconia deposits shows that they are free of microcracks and pores, although carbon contamination was detected by thermogravimetry. Coating hardness tests were also conducted and the results are presented.
Preparation and Properties of Cr3C2-25NiCr Thermal Spraying Powders and Coatings with Nano-Sized, Micro-Sized, and Bimodal Structures
Authors: Xie H. , Wang S. , Liao X. , Liu C. , Liu F.
Published: April 2023

Nano-sized, micro-sized, and bimodal Cr3C2-25NiCr feedstock powders were prepared using a spray drying and agglomeration sintering process and deposited by HVOF spraying. The microstructure and phase composition of the three powders and corresponding coatings were assessed along with coating hardness, toughness, and abrasive wear resistance. All three powders were nearly spherical in shape, but the bimodal powder had the best sphericity, the most uniform composition distribution, and the highest deposition efficiency. All three coatings were primarily composed of Cr3C2 and NiCr phases, although a small amount of Cr2O3 was detected in the nano- and micro-coatings due to oxidation. Compared with the micro-coating, the nano-coating has higher toughness but lower microhardness and abrasive resistance. The bimodal coating, however, integrates the advantages of the other coatings, has low porosity and a dense microstructure, and is tightly adhered to the substrate, thus displaying the best comprehensive performance.
Performance of HVOF Sprayed Ni-20 Cr+1%Zr Coating in Na2SO4-60%V2O5 Environment at 900 °C
Authors: Kaushal G. , Singh H. , Prakash S.
Published: April 2023

In this study, HVOF sprayed NiCr alloy coatings on A213 TP347H boiler steel are evaluated by severe corrosion tests in a high-temperature molten salt environment. XRD and FE-SEM/EDS analysis results are presented and discussed and correlated with corrosion kinetics.
The Correlation of the TBC Lifetimes in Burner Cycling Test with Thermal Gradient and Furnace Isothermal Cycling Test by TGO Effects
Authors: Li C.-J. , Dong H. , Ding H. , Yang G.-J.
Published: April 2023

This study investigates the correlation between thermal barrier coating (TBC) lifetime and thermally grown oxide (TGO) layer thickness. YSZ TBCs were deposited by atmospheric plasma spraying on Ni-base substrates and subjected to burner cycling tests with a thermal gradient and isothermal furnace testing. Both tests revealed that thermal cycling lifetime decreases with increasing TGO thickness, following a power law function, and for a critical TGO thickness of 5-6 μm, the failure mode changes from cracking within the YSZ layer to interface cracking around the TGO. Although either test can be used to evaluate TBC performance, burner cycling tests are better suited for evaluating ceramic topcoats, while furnace cycling test results integrate the effects of bond coat properties, especially oxidation resistance, as well as ceramic topcoat cracking resistance. The two tests can thus be used together to assess the factors that control TBC failure.
High Temperature Protective Performance of LT-HVOF Sprayed TiAl3-Al Coating for Ti-6Al-4V Substrate
Authors: Deng C.-M. , Liu M. , Yang W. , Zhang J. , Mao J. , Deng C. , Zhou K.
Published: April 2023

TiAl3-Al composite coatings are believed to hold promise for extending the service temperature range of titanium alloys used as structural materials. In this study, 0.6 x 40 mm Ti-6Al-4V specimens are coated with a 30 μm thick layer of TiAl3-Al by low-temperature HVOF spraying. Cross-sectional imaging shows that the as-sprayed coatings have a dense laminar microstructure and are well bonded to the substrate. Following the initial examination, the coating samples were placed in a muffle furnace, where they were held at 700 °C for up to 1000 h. Mass gain was detected starting at 200 h and remained nearly constant for the remainder of the test. This is an indication of excellent corrosion resistance, which is verified by SEM cross-sectioning and elemental EDS analysis. A brief explanation of the protective mechanism of the coating is provided.
Characterization of WC-Co Coating Modified by Nano-Sized TiC Addition Using Electron Microscopy Methods
Authors: Myalska H. , Swadźba R. , Rozmus R. , Moskal G. , Wiedermann J.
Published: April 2023

In this study, WC-Co coatings with nano-sized TiC additions were deposited on steel substrates by high velocity air fuel (HVAF) spraying and their microstructure and phase composition was analyzed using different electron microscopy techniques. Tungsten-reinforced cobalt phases detected in the vicinity of WC grains were identified as Co0.9W0.1 by selected area diffraction. No titanium phases other than TiC were found, which suggests that nano-TiC may increase the stability of metallic matrix microstructure in WC-based coatings.
A Comparison between Nanostructured YSZ Coatings Fabricated by LPPS and APS Method Using Unsintered Porous Agglomerates
Authors: Zhao Y. , Gao Y.
Published: April 2023

Nanostructured YSZ coatings were deposited by plasma spraying at different pressures and plasma currents. Coatings sprayed at low pressures exhibited fine equiaxed grain structures with consolidated coarser grains and loose-packed nano granules. Especially at the low end of the current range, larger amounts of crystalline grain fell into the nanoscale, significantly reducing the average grain size in the coating. At the high end of the range, the coating exhibited a uniform fine equiaxed grain structure of around 200 nm. Mechanical properties, including average microhardness and elastic modulus, were also measured and compared. LPPS YZS coatings showed slightly higher microhardness, but half the elastic modulus of APS YSZ layers.
Comparison of ZrB2-MoSi2 Composite Coatings Fabricated by Atmospheric and Vacuum Plasma Spray Processes
Authors: Niu Y. , Wang Z. , Zheng X. , Ding C.
Published: April 2023

In this work, ZrB2-MoSi2 (ZM) composite coatings are fabricated using two plasma spraying techniques: VPS and APS. Phase composition and coating microstructure were assessed and microstructural changes at 1500 °C were investigated along with corresponding oxidation behaviors. The results show that the VPS composite coatings have lower oxide content, surface roughness, and porosity and much higher oxidation resistance than coatings produced by atmospheric plasma spraying. Possible reasons for the differences observed are presented.
Evaporation Enhancement of YSZ Spray Particles for PS-PVD by Modifying the Nozzle in Conventional 80 kW Plasma Spray System
Authors: Chen Q.-Y. , Li C.-J. , Li C.-X. , Yang G.-J.
Published: April 2023

One way to reduce plasma jet velocity and prolong the dwell time of spray particles in the jet is to enlarge the orifice of the torch nozzle. In this study, normal and modified nozzles are used to deposit YSZ particles on ceramic and superalloy substrates by plasma spray-physical vapor deposition (PS-PVD). The modified nozzle is shown to increase the evaporation of YSZ particles and thus the quantity of Zr atoms and Zr1+ ions in the plasma jet, which allows columnar structured coatings to be realized at higher deposition rates using a conventional 80 kW plasma spray system. The columnar ceramic coatings are also shown to have good conformity on cold-sprayed MCrAlY bond coats with high surface roughness.
Enhancement of Wear and Impact Resistance of Fe Based Amorphous Coatings by the Addition of Alumina Particles
Authors: Yasir M. , Zhang C. , Wang W. , Xu P. , Liu L.
Published: April 2023

This study assesses the influence of alumina particle additions on the impact and wear behavior of iron based amorphous coatings. Test results show that the presence of Al2O3 particles improved the impact and wear resistance of the coatings by a factor of three. Deformation and fracture mechanisms under impact loading were also investigated. It was revealed via SEM analysis and finite element simulations that hard second phase particles in the amorphous coating matrix disperse residual stresses generated during impact loading and that brittle particles absorb impact energy by fracturing, which plays a vital role in crack prevention and arresting. Abstract only; no full-text paper available.
Study of High Velocity Arc Sprayed Heat Resistant Coatings from FeCrAlBY Cored Wire
Authors: Korobov Y. , Nevezhin S. , Filippov M. , Makarov A. , Malygina I. , Fantozzi D. , Milanti A. , Koivuluoto H. , Vuoristo P.
Published: April 2023

This work evaluates the influence of yttrium on the heat and wear resistance of active arc sprayed (AAS) coatings produced using FeCrBAl cored wire. The AAS process differs from ordinary arc spraying in that it uses propane-air combustion products as a carrier gas instead of compressed air. This increases particle velocity and temperature and forms a reducing atmosphere that protects metal particles in flight and improves coating adhesion and porosity. Coating samples produced with different amounts of yttrium were characterized in terms of surface morphology, microstructure, phase composition, and hardness. They were also subjected to heat resistance, abrasive wear, and corrosion tests in which they performed better than typical wrought steels used in boilers.
Influence of Free Silicon Content on the Oxidation Resistance of SiC Coatings on C/SiC Composites
Authors: Jia F. , Peng H. , Ji X. , Zhang X. , Shen J.
Published: April 2023

In this work, SiC coatings varying in content were prepared on carbon-fiber-reinforced silicon-carbide composite (C/SiC) substrates in order to study the effect of free silicon on oxidation resistance. The coatings were formed in a vacuum atmosphere by means of pack cementation using a powder mixture ranging in content as follows: 20-50 wt% SiC, 20-60 wt% Si, 7-12 wt% graphite, and 6-10 wt% Al2O3. Coating surface and cross-sectional morphologies were examined using SEM, EDS, and semiquantitative XRD analysis and oxidation resistance was determined by cyclic oxidation testing in air at 1300 °C. The results show that cracks and voids decrease with increasing free silicon content and that coatings with an appropriate amount of free silicon have better oxidation resistance than those with no free silicon at all. However, further increases in silicon content were found to be detrimental to oxidation behavior for a number of reasons that are discussed.
Sliding Wear Investigation of Plasma and High Velocity Oxy-Fuel Sprayed Alumina Coatings
Authors: Ali O. , Ahmed R. , Alawadhi H. , Shameer M.
Published: April 2023

This work investigates the sliding wear resistance of alumina coatings deposited on stainless steel substrates by HVOF and air plasma spraying, using fine (1-5 μm) and conventional (10-45 μm) powders. Sliding wear tests were carried out using a sintered WC-Co ball as the counter-body and the wear tracks were examined to obtain a better understanding of wear mechanisms. HVOF coatings showed an order of magnitude improvement in wear resistance compared to their APS counterparts. The disparity in wear performance is correlated to differences in phase composition, porosity, hardness, and fracture toughness as revealed by SEM and XRD analysis and nanoindentation testing. The development of tribofilms and their role in wear behavior is also discussed.
Microstructure and Tribological Performance of Cr7C3-(Ni,Cr)3(Al,Cr) Coating Deposited from Cr7C3 In-Situ Synthesized Alloy Powder
Authors: Hongbin Z. , Jie S. , Feng G. , Yueguang Y. , Changhai L.
Published: April 2023

In this investigation, spherical Cr7C3-(Ni,Cr)3(Al,Cr) powder with different compositions was prepared by vacuum melting and gas atomization. During the solidification process, Cr7C3 is in-situ synthesized and uniformly distributed in the Cr-doped Ni3Al phase. Coatings produced from the powders by HVOF spraying were characterized based on composition, microstructure, hardness, and tribological properties. The results show that the coatings compare well with commercial Cr3C2-NiCr coatings used on piston rings in heavy duty diesel engines. Optimization routes for further improvement are also discussed.
Improving Corrosion Resistance of Al6061 Coating Deposited by an In-Situ Shot-Peening Assisted Cold Spray
Authors: Wei Y.-K. , Luo X.-T. , Li C.-J.
Published: April 2023

This study demonstrates a novel method for improving the corrosion resistance of cold sprayed Al6061 coatings. Large stainless steel particles were added to a commercial Al6061 powder and the mixture was deposited on Mg alloy AZ31B substrates using nitrogen gas at low working pressure and temperature. It is shown that the stainless steel particles had a shot-peening effect, thus increasing the density as well as the corrosion resistance of Al6061 coatings. SEM examination showed that no stainless steel particles were incorporated in the coating.
Preparation and Characterization of (La0.9Ca0.1)(Cr0.9Mg0.1)O3 High Emissivity Coatings Deposited by APS
Authors: Yanbo L. , Quansheng W. , Lihong G. , Yunpeng C. , Zijian J. , Hao W.
Published: April 2023

In this study, (La0.9Ca0.1)(Cr0.9Mg0.1)O3 ceramic powders prepared by solid-state synthesis were deposited on nickel-base superalloy substrates by atmospheric plasma spraying. Powder morphology and coating surfaces were examined by SEM, and composition and phase structure were evaluated by EDS and XRD. Coating porosity and bond strength were measured and emissivity and thermal shock tests were carried out. The results show that the powders maintained their perovskite structure during spraying and that no impurities were introduced in flight. The emissivity of the coatings was found to be 0.88 at 600 °C and 0.89 at 800 °C, which is attributed to lattice distortion stemming from differences between doping and original ions and the valence states of Mg2+ and Cr3+. Coating crystal structure was stable over the thermal shock range from room temperature to 1100 °C and no spalling or fracture occurred after ten shock cycles.
AVALIAÇÃO DO FATOR DE PROTEÇÃO SOLAR IN VITRO E DESENVOLVIMENTO DE GEL CONTENDO EXTRATO DE VITIS LABRUSCA
Authors: Jusvick Alessandra , Quatrin Rafaela , Schons Adelise Maiane , Pagno Andressa Rodrigues , Piana Mariana
Published: April 2023

Vitis labrusca é popularmente conhecida como videira. Essa espécie vem ganhando destaque no mercado cosmético por apresentar características ímpares, como atividades antioxidante, antiinflamatória, antimicrobiana, dentre inúmeras outras, por apresentarem grande quantidade de compostos fenólicos.  O objetivo deste trabalho foi avaliar o fator de fotoproteção do extrato das folhas de Vitis labrusca frente aos raios ultravioleta B e desenvolver uma formulação cosmética contendo este extrato. A quantificação de flavonoides foi realizada de acordo com Woisky e Salatino (2015), o fator de proteção solar de acordo com Mansur et al. (1986) e o estudo de estabilidade preliminar de acordo com Guia de produtos cosméticos (2004). O extrato apresentou fator de proteção entre 0,22 e 9,2 mg% de flavonoides. O gel desenvolvido, contendo 3% do extrato das folhas de V. labrusca apresentou estabilidade preliminar adequada. O fator de proteção B foi considerado baixo apesar de apresentar quantidade considerável de flavonoides, sugere-se que o extrato possa ser avaliado quanto a sua capacidade antioxidante.
Theoretical and applied aspects of understanding the concept “legal orientation” in legal science
Authors: Kachur Vira
Published: April 2023

The study of theoretical and applied aspects of understanding the concept “legal orientation” in legal science is relevant, of practical interest and requires scientific consideration. Globalization generates radical changes that can lead to both further evolution of humanity and adverse consequences. The search for joint survival and development programs depends on the legal culture that determines the legal orientations of social actors. The purpose of this paper was to figure out the theoretical and applied aspects of understanding the concept “legal orientation” in legal science. This study is based on an interdisciplinary approach and considers the knowledge of various sciences about human behaviour. General scientific and special scientific methods of cognition of social phenomena and processes were used to conduct the study. Among general scientific methods, methods of logical-semantic and terminological analysis, anthropological, system-structural, causal-functional, data analysis, praxeological, and content analysis were used. Experimental methods of observation, conversations, surveys, and questionnaires were used to obtain empirical data. The presented results of the theoretical and applied study of the concept “legal orientation” in legal science allowed figuring out at least four meanings of its use, showed its inextricable connection with the concept “value orientations” – a dynamic system that regulates social behaviour and human activity, and therefore requires constant diagnostics. Based on the diagnosis of the value orientations of the student youth of the National University of Life and Environmental Sciences of Ukraine, methodical recommendations were developed to form the system of value orientations of a young individual who obtains higher education, which will be consonant with the system of value orientations of Ukraine. The results of this study will be useful for researchers investigating the axiological and praxeological components of human activity in various spheres of social life; for state and public institutions related to the implementation of strategies for the development of civil society and the rule of law, for teachers and lecturers in the education and upbringing of future citizens of Ukraine, as well as for all stakeholders.