Search results for "Forming"
showing 10 items of 1719 documents
Design Of Experiments for the optimization the process parameters of thixotropic aluminum alloy
2006
The success of the thixoforming process depends on the possibility to confer to material, when it is found in the semisolid state, a microstructure characterized by globular particles of solid phase surrounded by a continuous film of liquid phase; such microstructure is obtainable through particular thermo-mechanical treatments. In the present research, in order to optimize the influence of process parameters in the step in which the thixotropic properties are conferred to the AA7075 aluminum alloy, the statistic technique of the Design Of Experiments (DOE) has been used. The advantages in the application of such technique are expressible in terms of reduction the times of development of pr…
MicroRNAs Associated With Biological Pathways of Left- and Right-sided Colorectal Cancer.
2020
BACKGROUND/AIM MicroRNAs (miRNAs) regulate the development of colorectal cancer (CRC). We aimed to investigate miRNAs and their relation to cancer-related signaling pathways in site-specific CRC. MATERIALS AND METHODS We used a total of 24 left- and right-sided Finnish CRC samples (discovery cohort) and The Cancer Genome Atlas public mature miRSeq dataset of 201 CRC samples (validation cohort). MiRNA differential expression and biological pathway analyses were performed using DESeq2 and the DIANA/mirPath tool, respectively. RESULTS We found 17 significantly differentially up-regulated [false discovery rate (FDR) <0.05] miRNAs in left-sided CRC ("left miRNAs"), and 15 in right-sided CRC ("ri…
Anxiety and self-esteem as mediators of the relation between family communication and indecisiveness in adolescence
2013
Abstract In this study, we explored the unique and common contributions of anxiety, self-esteem, and family communication on indecisiveness among adolescents. Three hundred and fifty pupils from 13 to 16 years of age completed selfreport measures on indecisiveness, quality of family communication, trait anxiety, and self-esteem. The findings in this study showed that students’ indecisiveness is predicted by family communication mediated by anxiety and self-esteem. These results have important implications for practice as it stresses the importance of anxiety and self-esteem. Nevertheless, the counselors could also focus on enhancing relationship-building skills by introducing the adolescent…
Mamá, quiero ser artista. La situación actual de la mujer en el panorama artístico
2011
La lucha reivindicativa de la mujer por hacerse un hueco en el panorama artístico se acentúa en los años setenta con grandes artistas que defienden sus derechos en Estados Unidos y Europa a través de nuevos medios como la fotografía o la performance. Éstas van abriendo hueco a sus generaciones posteriores. La herencia que ellas han dejado permite a la mujer trabajar sin plantearse cuestiones de género como sí se hacía en el pasado, aunque este hecho no significa que esté todo solucionado y que haya que bajar la guardia. La artista Natalia Lozano, artista emergente multidisciplinar, sirve como ejemplo para conocer qué situación se encuentra una mujer joven hoy en día y permite sacar una lect…
Anaerobic digestion of grass silage in batch leach bed processes for methane production.
2007
Abstract Anaerobic digestion of grass silage in batch leach bed reactors, with and without a second stage upflow anaerobic sludge blanket (UASB) reactor, was evaluated. Sixty six percent of the methane potential in grass was obtained within the 55 days solids retention time in the leach bed–UASB process without pH adjustment, whereas in the one-stage leach bed process 20% of the methane potential in grass was extracted. In two-stage operation, adjustment of the pH of influent to the leach bed reactor to 6 with HCl led to inhibition of both hydrolysis/acidogenesis and methanogenesis. In the leach bed–UASB process 39% of the carbohydrates and 58% of the acid soluble lignin were solubilised wi…
Music, Architecture, Proportion and the Renaissance Way of Thinking
2020
During the Renaissance, the language of proportion became a unified theory capable of encompassing the understanding of the world within a coherent theological, philosophical and artistic framework. Music, with its harmonic paradigm, plays a key role in this construction. From the fifteenth century through to the end of the sixteenth century, architects and architectural theorists made reference, both in new treatises and commentaries to Vitruvius, to musical matters, transforming architecture into the summa of knowledge. The affinity to music was grounded on both a common mathematical and rhetoric gnosiology. Formerly conceived of as ideal, numbers became eloquent, reinforcing the quantita…
La empresa 60 de las Empresas Morales de Juan de Borja. Posible origen textual de la imagen del caracol
2014
ABSTRACT: The author of this essay argues that the source of the image of the snail from Juan de Borja’s 60th impresa of his Empresas Morales is textual, and that it can be traced back to the Picta Poesis by Aneau Barthelemy. KEYWORDS: Source, Snail, Impresa, Empresas Morales , Juan de Borja, Picta Poesis , Aneau Barthelemy. RESUMEN: El autor defiende, en el presente articulo, que el origen de la imagen del caracol que aparece en la empresa numero 60 de las Empresas Morales de Juan de Borja posee un origen escrito y que puede rastrearse hasta la Picta Poesis de Aneau Barthelemy. PALABRAS CLAVES: Origen, Caracol, Empresa, Empresas Morales , Juan de Borja, Picta Poesis, Aneau Barthelemy.
Influence of mechanical properties of the sheet material on formability in single point incremental forming
2004
Abstract New trends in sheet metal forming are rapidly developing and several new forming processes have been proposed to accomplish the goals of flexibility and cost reduction. Among them single point incremental forming operations, in which the final shape of the component is obtained by the relative movement of a simple and small punch with respect to the blank, appear quite promising. In the paper, material formability issues in incremental forming were studied. Some relevant correlations among material formability and other mechanical properties of the material were analysed. The FLD 0 value, i.e. the major strain at fracture in plane strain conditions, was determined for different mat…
Analysis of Some Innovative and Flexible Sheet Forming Processes
2002
In the field of sheet forming, innovative and flexible processes that do not impose the use of expensive conventional equipments and/or do not require time consuming set-up operations have become, nowadays, a rather promising research topic. Two different main lines are currently followed: the former is based on the development of new stamping processes based on the utilization of flexible media, while the latter is aimed to develop so called progressive forming processes (spinning and incremental forming). Both hydro-forming and incremental forming permit a very relevant reduction of the tooling and set-up costs and improve process flexibility. These items are discussed in detail in the pa…
Robot-based incremental sheet forming – the tool path planning
2021
Abstract To achieve a 3D shape with certain degree of complexity from metal sheets that are flat in the beginning, especially for prototype development or small series production, that is also cost efficient by avoiding high-end dies or expensive tooling, the incremental sheet forming process can represent the ideal choice due to its flexibility, reduced forming forces and increased formability. The process is performed with a round tool that follows a predefined path to deform the flat metal sheet into its final shape. The proper selection of the toolpaths affects the productivity and the accuracy of each part. The process having to focus on forming each single point in increments. For cos…