Search results for "Issues"

Nuclear weak response from the combined study of beta-decay and charge-exchange reaction

2009

Studying the weak nuclear response, especially the Gamow-Teller (GT) transitions, of stable as well as unstable pf-shell nuclei, is one of the key issues in nuclear and astro-nuclear physics. We study the decay half-lives and the GT transitions starting from Tz = ±1 and ±2 mirror nuclei, respectively, by means of β decays and complementary hadronic (3 He , t) charge-exchange reactions. Under the assumption that isospin is a good quantum number, symmetry is expected for mirror nuclei and the GT transitions starting from the mirror nuclei. The half-lives and branching ratios and the measured strength distributions of GT transitions are compared and also combined for the understanding of the …

Tz = ±1 → 0 ISOSPIN SYMMETRY GAMOW-TELLER TRANSITIONS IN pf-SHELL NUCLEI

2010

Studying the Gamow-Teller (GT) transitions of stable as well as unstable pf-shell nuclei is one of the key issues in nuclear and astro-nuclear physics. Under the assumption that isospin T is a good quantum number, symmetry is expected for mirror nuclei and the GT transitions starting from the mirror nuclei. We study the GT transitions starting from Tz = ±1 mirror nuclei, respectively, by means of hadronic (3 He , t) charge-exchange reactions and complementary β decays.

Is the Universe Fractal?

1999

One of the key issues in cosmology is the question of whether the universe is smooth or fractal at large dimensions. The answer has a bearing on the big bang model of the origin of the universe. MartA­nez discusses why recent analyses have come to opposing conclusions regarding this question and looks at how good a case can be made for large-scale smoothness of the universe.

Variable-Radius Offset Surface Approximation on the GPU

2020

Variable-radius offset surfaces find applications in various fields, such as variable brush strokes in 2D and 3D sketching and geometric modeling tools. In forensic facial reconstruction the skin surface can be inferred from a given skull by computing a variable-radius offset surface of the skull surface. Thereby, the skull is represented as a two-manifold triangle mesh and the facial soft tissue thickness is specified for each vertex of the mesh. We present a method to interactively visualize the wanted skin surface by rendering the variable-radius offset surfaces of all triangles of the skull mesh. We have also developed a special shader program which is able to generate a discretized vol…

Performance study of the fast timing Cherenkov detector based on a microchannel plate PMT

2017

Prototype of the fast timing Cherenkov detector, applicable in high-energy collider experiments, has been developed basing on the modified Planacon XP85012 MCP-PMT and fused silica radiators. We present the reasons and description of the MCP-PMT modification, timing and amplitude characteristics of the prototype including the summary of the detector's response on particle hits at oblique angles and MCP-PMT performance at high illumination rates. peerReviewed

Identification of plant cells in black pigments of prehistoric Spanish Levantine rock art by means of a multi-analytical approach. A new method for s…

2017

We present a new multi-analytical approach to the characterization of black pigments in Spanish Levantine rock art. This new protocol seeks to identify the raw materials that were used, as well as reconstruct the different technical gestures and decision-making processes involved in the obtaining of these black pigments. For the first of these goals, the pictorial mat- ter of the black figurative motifs documented at the Les Dogues rock art shelter (Ares del Maestre, Castello ́ n, Spain) was characterized through the combination of physicochemical and archeobotanical analyses. During the first stage of our research protocol, in situ and non- destructive analyses were carried out by means of…

Study of behavioral and neurophysiological mechanisms following motor imagery training

2017

For many years, research in motor control, sport science and rehabilitation focused on the performance improvement following mental practice. However, some mechanisms, behavioral and neurophysiological, remain insufficiently understood. In our first study, we demonstrated the impossibility to predict the future performance improvement following imagined repetitions of a speed accuracy trade-off task, with a subjective evaluation of imagery ability of young healthy individuals. However, it is essential to produce clear and vivid mental simulations throughout the training to obtain a better performance improvement. Besides, by a further analysis of performance, the results of our second study…

Book Review: Mia Arp Fallow and Cory Blad (eds) Social Welfare Responses in a Neoliberal Era. Policies, Practices, and Social Problems

2020

The VET System, Its Subsystems and Their Links with the Labour Market: Strengths, Weaknesses and Challenges of VET in Spain

2019

This chapter provides the reader with the historical and political background to understand the rest of the book, and it also focuses on the key issues affecting VET in Spain in recent times while assessing the quality of VET rather positively. I explain the parallel development of three different subsystems and their approaches and efforts to reintegrate them. I also show conflicts over control upon VET governance and the role of national and regional governments as well as employers and union representatives in the design of qualifications. Transitions between education and employment, careers guidance and the connections of VET to social policies are also addressed.

The Lineup of Social Entrepreneurship

2021

As an introductory chapter to the second section, this chapter describes the sequence of the social entrepreneurship analysis followed from the macro perspective. As a chronology, the construction of social ventures begins with a social problem or an unjust social equilibrium. At this point, an individual tries to change the unjust situation through a disruptive idea. The big challenge for that individual arises because, as in any equilibrium situation, institutional forces make difficult the shift from one situation to another. One of the main issues linked to the institutional forces is legitimacy, which can be seen to a certain extent as conflicts of interest. Finally, social ventures an…