title: Investigating Gravity and Electromagnetism on a 10 Dimensional Manifold with Local Symmetry so(2,3)

authors: Ussher, Matthew Neville

abstract: The Hawthorn model [1] is built upon the idea that the Lie algebra so(2, 3) is a more natural description of the local structure of space-time than the Poincare Lie algebra, with the former contracting to the latter in the limit of the contraction parameter r tending to infinity. This notion is explored in the context of a 10-dimensional space-time referred to as an ADS manifold. Here we build on the work of Crump [2] and try to incorporate field equations for gravity into the model. We derive two apparently different equations describing gravitational phenomena, demonstrate an intimate connection between gravity and electromagnetism and provide a first estimate as to the value of the contraction parameter r.

text: Investigating Gravity and Electromagnetism on a 10 Dimensional Manifold with Local Symmetry so(2,3) The Hawthorn model [1] is built upon the idea that the Lie algebra so(2, 3) is a more natural description of the local structure of space-time than the Poincare Lie algebra, with the former contracting to the latter in the limit of the contraction parameter r tending to infinity. This notion is explored in the context of a 10-dimensional space-time referred to as an ADS manifold. Here we build on the work of Crump [2] and try to incorporate field equations for gravity into the model. We derive two apparently different equations describing gravitational phenomena, demonstrate an intimate connection between gravity and electromagnetism and provide a first estimate as to the value of the contraction parameter r.

year: 2013

title: Study on hydrogen storage performance of as-milled Ti-V-Cr-Fe-Mn high entropy alloys

authors: Zhai, Yutao

abstract: This study aims to fabricate and optimize BCC-based high-entropy hydrogen storage alloys through mechanical alloying. The research systematically investigates the effects of processing parameters (including milling time, ball-to-powder ratio, rotation speed, and process control agent (PCA) addition), alloy composition, and heat treatment on the phase structure, thermodynamic stability, and hydrogen storage performance of the fabricated alloys. Furthermore, the study compares the microstructure and hydrogen storage properties of alloys fabricated by different methods (mechanical alloying and arc melting).

Firstly, the study optimizes the mechanical alloying parameters, revealing the critical roles of milling time, ball-to-powder ratio, and rotation speed in forming BCC structures and nanocrystalline grains in Ti-V-Cr-Mn-Fe alloys. The regulatory effects of PCA addition on powder yield and particle size are also analyzed. Subsequently, the impact of composition on hydrogen storage properties, including hydrogen absorption/desorption kinetics, thermodynamic behavior, and cycling stability, are explored by varying the Ti content and Mn/Cr ratios. It is found that increasing Ti content enhances the proportion of C14 Laves phases, while increasing Mn content effectively suppresses Laves phase formation, thereby increasing the BCC phase fraction and improving hydrogen storage kinetics.

Additionally, the role of heat treatment is examined. Microstructural evolution analysis reveals the phase transformation behavior among BCC, FCC, and Laves phases under different heat treatment conditions and their effects on hydrogen storage capacity. Specifically, as the temperature increases, the BCC structure first decomposes into a BCC + FCC dual-phase structure, followed by the precipitation of the Laves-2 phase within the FCC phase. After high-temperature treatment, the lattice constant of the BCC phase decreases, and the synergistic effect of the Laves and FCC phases results in a slight reduction in the hydrogen absorption and desorption capacity of the alloy. Finally, by comparing different fabricating process, the differences in microstructure and hydrogen storage performance of Ti25V35(CrMnFe)40 alloys prepared by these methods are investigated. The results suggested that Mechanical alloying significantly enhances initial the activation performance and hydrogen absorption kinetics of the as-milled alloys are improved compared to the counterparts of as-cast alloys.

text: Study on hydrogen storage performance of as-milled Ti-V-Cr-Fe-Mn high entropy alloys This study aims to fabricate and optimize BCC-based high-entropy hydrogen storage alloys through mechanical alloying. The research systematically investigates the effects of processing parameters (including milling time, ball-to-powder ratio, rotation speed, and process control agent (PCA) addition), alloy composition, and heat treatment on the phase structure, thermodynamic stability, and hydrogen storage performance of the fabricated alloys. Furthermore, the study compares the microstructure and hydrogen storage properties of alloys fabricated by different methods (mechanical alloying and arc melting).

Firstly, the study optimizes the mechanical alloying parameters, revealing the critical roles of milling time, ball-to-powder ratio, and rotation speed in forming BCC structures and nanocrystalline grains in Ti-V-Cr-Mn-Fe alloys. The regulatory effects of PCA addition on powder yield and particle size are also analyzed. Subsequently, the impact of composition on hydrogen storage properties, including hydrogen absorption/desorption kinetics, thermodynamic behavior, and cycling stability, are explored by varying the Ti content and Mn/Cr ratios. It is found that increasing Ti content enhances the proportion of C14 Laves phases, while increasing Mn content effectively suppresses Laves phase formation, thereby increasing the BCC phase fraction and improving hydrogen storage kinetics.

Additionally, the role of heat treatment is examined. Microstructural evolution analysis reveals the phase transformation behavior among BCC, FCC, and Laves phases under different heat treatment conditions and their effects on hydrogen storage capacity. Specifically, as the temperature increases, the BCC structure first decomposes into a BCC + FCC dual-phase structure, followed by the precipitation of the Laves-2 phase within the FCC phase. After high-temperature treatment, the lattice constant of the BCC phase decreases, and the synergistic effect of the Laves and FCC phases results in a slight reduction in the hydrogen absorption and desorption capacity of the alloy. Finally, by comparing different fabricating process, the differences in microstructure and hydrogen storage performance of Ti25V35(CrMnFe)40 alloys prepared by these methods are investigated. The results suggested that Mechanical alloying significantly enhances initial the activation performance and hydrogen absorption kinetics of the as-milled alloys are improved compared to the counterparts of as-cast alloys.

year: 2025-07-16

title: Breaking the consensus: The politicisation of Maori affairs

authors: Barber, Keith

subjects: Tremewan

abstract: This article takes issue with the claim made by Tremewan (2005a) that the
New Zealand social sciences have been uncritical of neotraditionalist and
culturalist trends in social policy. It points out that at least since the 1980s
there has existed a significant body of social science literature critical of these trends. The article also takes issue with Tremewan’s attribution of increased political dissent in the area of Maori affairs to the culturalist ideological currents dominating social policy. The article provides an alternative explanation for this increase in political dissent by focusing upon the material conditions of existence and the opportunism of power-seeking politicians.

text: Breaking the consensus: The politicisation of Maori affairs This article takes issue with the claim made by Tremewan (2005a) that the
New Zealand social sciences have been uncritical of neotraditionalist and
culturalist trends in social policy. It points out that at least since the 1980s
there has existed a significant body of social science literature critical of these trends. The article also takes issue with Tremewan’s attribution of increased political dissent in the area of Maori affairs to the culturalist ideological currents dominating social policy. The article provides an alternative explanation for this increase in political dissent by focusing upon the material conditions of existence and the opportunism of power-seeking politicians.

year: 2006