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Aufsatz
Predicting Flow Stress Behavior of an AA7075 Alloy Using Machine Learning Methods
(2022-09-09)
The present work focuses on the prediction of the hot deformation behavior of thermo-mechanically processed precipitation hardenable aluminum alloy AA7075. The data considered focus on a novel hot forming process at different tool temperatures ranging from 24°C to 350°C to set different cooling rates after solution heat-treatment. Isothermal uniaxial tensile tests in the temperature range of 200°C to 400°C and at strain rates ranging from 0.001 s-¹ to 0.1 s-¹ were carried out on four different material conditions. ...
Aufsatz
Effects of Aging under Stress on Mechanical Properties and Microstructure of EN AW 7075 Alloy
(2021-07-20)
In the present study, microstructural and mechanical properties of EN AW 7075 following stress-aging were assessed. For this purpose, properties of stress-aged samples were compared with values obtained for conventionally aged counterparts. It is revealed that the strength and hardness of EN AW 7075 can be increased by the presence of external stresses during aging. Precipitation kinetics were found to be accelerated. The effects of conventional and stress-aging on the microstructure were analyzed using synergetic ...
Aufsatz
Effect of Friction Stir Processing on Microstructural, Mechanical, and Corrosion Properties of Al-Si12 Additive Manufactured Components
(2020-01-03)
Additive manufacturing (AM) is an advanced manufacturing process that provides the opportunity to build geometrically complex and highly individualized lightweight structures. Despite its many advantages, additively manufactured components suffer from poor surface quality. To
locally improve the surface quality and homogenize the microstructure, friction stir processing (FSP) technique was applied on Al-Si12 components produced by selective laser melting (SLM) using two different working media. The effect of FSP on ...
Aufsatz
Influence of complex geometries on the properties of laser-hardened surfaces
(2020-04-25)
Laser surface hardening provides for many advantages in terms of flexible production due to very localized and controlled energy input into the material. Laser processing offers the possibility to treat surfaces in order to locally strengthen the areas that are prone to fatigue cracking. It is well known that laser energy absorption depends on many parameters, e.g., the surface structure and the surface orientation. The incident angle of the laser beam plays a key role in this regard. When complex geometries like ...
Video
TERRITORIO Y PAISAJES CULTURALES EN EL PERÚ
(2021-01-16)
El Perú se caracteriza por su diversidad y complejidad, presentando 84 zonas de vida de las 108 definidas para la Tierra. En estos distintos ambientes, desde las primeras poblaciones se ha desarrollado una vital interacción social con la naturaleza a partir de los vastos procesos de domesticación de plantas y animales.
Esta construcción territorial está no solo en crisis sino ante una severa amenaza frente a los paradigmas globales y metropolitanos, que imponen modelos de desarrollo que se independizan de los valores ...
Video
EN BUSCA DE ARQUITECTURAS
(2021-06-26)
En esta conferencia se presentan las formas de organización y los métodos no convencionales de la enseñanza de arquitectura que la naturaleza particular del Taller Vertical ha permitido desarrollar.
Juvenal Baracco Barrios
Ingeniero Civil y Arquitecto por la Universidad Nacional de Ingeniería UNI
Becado del Deutscher Akademischer Austauschdienst DAAD en Berlín
Medalla Ricardo Palma por la Universidad Ricardo Palma URP
Doctor Honoris Causa URP
Profesor Universitario UNI (1965-1971)
Profesor principal de ...
Dissertation
Designing Breeding Programs For Improving Milk Yield Performance Of Indigenous Genous Dairy Cattle In Sudan
(2022)
The overall aim of the present study was to design appropriate breeding programs for the sustainable improvement of Butana cattle in Sudan. Four studies were conducted, beginning with a comprehensive review of literature on indigenous dairy cattle breeding strategies in sub-Saharan Africa with a focus on the factors that contribute to their success or failure. It showed that crossbreeding of indigenous breeds with exotic breeds has been widely used for genetic improvement, but it largely failed under low-input ...
Dissertation
Taking a Closer Look at the Desirability of Desirable Difficulties - Additionally Focusing on Required Prerequisites, Negative Side-Effects, and Negative Consequences
(2022)
As the title of my dissertation already indicates, the main purpose of the following work was to take a closer, more thorough, and encompassing look at the desirability of desirable difficulties. The term desirable difficulties thereby subsumes varying types of difficult, demanding, and challenging learning strategies—like the application of (learning/practice) tests and generation tasks: Working on and successfully solving those difficult tasks requires more (cognitive) effort compared to working on easier learning ...
Dissertation
Validation of a generalized model for the description of polycrystalline exchange-biased magnetic thin films
(2022)
Applications based on nano- and microscaled systems have become indispensable in many aspects in everyday life, industry, research and medicine. In this regard, thin film technology plays a crucial role with the physical properties of solids changing significantly when they are reduced to thin layers with thicknesses in the nanometer range. In this regime, a solid’s microstructure as well as boundary and surface effects start to dominate. A prominent example is the exchange bias effect, which results due to the ...
Teil eines Buches
La tradición discursiva como concepto transdisciplinario: lingüística, literatura y ciencias culturales
(Iberoamericana / Vervuert, 2022)
Una cuestión fundamental que la lingüística se plantea es averiguar qué principios, reglas y tradiciones se emplean en la realización de tareas comunicativas y de dónde viene la tradicionalidad del habla. El concepto de tradición discursiva responde a cómo se configuran las plantillas textuales y los patrones del discurso y permite reconocer la tradicionalidad del habla. El propósito de esta contribución es mostrar cómo este concepto, forjado en la lingüística románica, resulta productivo en las áreas de confluencia ...