Conference Papers (Physics)
http://hdl.handle.net/10566/1696
2024-03-29T07:00:25ZPreface Metamorphism and Orogenic belts—response from micro- to macro-scale
http://hdl.handle.net/10566/8128
Preface Metamorphism and Orogenic belts—response from micro- to macro-scale
reinhardt, jurgen
The geological toolbox for the analysis of orogenic processes has seen substantial additions over the recent decades. Major advances have been made in the ability to simulate geological conditions and processes by computer modeling, we have a much improved knowledge of geochemical processes (trace elements and isotopes in particular), and, last but not least, the range and versatility of micro-analytical methods and instrumentation available to us has been expanded dramatically. The latter aspect has had a particular impact on metamorphic petrology as the conventional tools to determine pressure-temperature-time paths via rock and mineral analysis combined with isotope geochronology have generally gained in precision and accuracy through a much improved resolution.
2019-01-01T00:00:00ZSurveys with small optical telescopes
http://hdl.handle.net/10566/8127
Surveys with small optical telescopes
gray, tony
odern astrophysics owes its existence to small-telescope surveys dating back to the 18th century, for example
Flamsteed (1725). In the 19th century, Argelander’s survey based on visual observations with small telescopes
and meridian circles culminated in the 1859 publication of the Bonner Durchmusterung (BD), a catalogue of
northern hemisphere stars brighter than ninth magnitude, with accompanying charts (Batten 1991). The BD
catalogue was later extended to the southern hemisphere by the Córdoba Durchmusterung (CD; 1892 onwards)
prepared using Argelander’s method, and the Cape Photographic Durchmusterung (CPD; 1885onwards) based on
photographic plates.
2019-01-01T00:00:00ZBiomass Energy Dependence in South Africa: Are the Western Cape Province households descending the energy ladder after improvement in electricity access?
http://hdl.handle.net/10566/5733
Biomass Energy Dependence in South Africa: Are the Western Cape Province households descending the energy ladder after improvement in electricity access?
Muazu, N.B; Ogujiuba, K; Tukur, H.R
South Africa was considered to have attained universal access to modern energy from 1994 to 2012. This meant that the number of households that moved away from the use of dirty energy to clean energy for domestic activities has drastically increased “ascending the energy ladder”. However, recent trends in household energy consumption in many developing countries are showing many households have either retained or are reversing to fuelwood use despite the modern energy access "descending the energy ladder”. Against this backdrop, the present study evaluates whether or not South African households are still using fuelwood for domestic activities” descending the energy ladder” even after the rapid improvement in electricity access. Both theoretical and empirical literature suggests that households in developing countries often choose their energy type based on certain factors. We take this assumption to test in the Western Cape Province by employing a quantitative cross-sectional survey design involving a structured questionnaire from 1199 fuel-wood household consumers. The findings revealed that electricity access has made households to “move up the energy ladder” instead of “descending the energy ladder "for the reasons of household marital status, size of the household, household income, and employment status of the household. The study recommends more investment in human capital to enable households to have easy access to modern clean energy
2020-01-01T00:00:00ZModel-independent constraints on dark energy and modified gravity with the SKA
http://hdl.handle.net/10566/1822
Model-independent constraints on dark energy and modified gravity with the SKA
Zhao, Gong-Bo; Bacon, David; Maartens, Roy; Santos, Mario G.; Raccanelli, Alvise
Employing a nonparametric approach of the principal component analysis (PCA), we forecast
the future constraint on the equation of state w(z) of dark energy, and on the effective Newton
constant m(k; z), which parameterise the effect of modified gravity, using the planned SKA HI
galaxy survey. Combining with the simulated data of Planck and Dark Energy Survey (DES), we
find that SKA Phase 1 (SKA1) and SKA Phase 2 (SKA2) can well constrain 3 and 5 eigenmodes
of w(z) respectively. The errors of the best measured modes can be reduced to 0.04 and 0.023
for SKA1 and SKA2 respectively, making it possible to probe dark energy dynamics. On the
other hand, SKA1 and SKA2 can constrain 7 and 20 eigenmodes of m(k; z) respectively within
10% sensitivity level. Furthermore, 2 and 7 modes can be constrained within sub percent level
using SKA1 and SKA2 respectively. This is a significant improvement compared to the combined
datasets without SKA.
Advancing Astrophysics with the Square Kilometre Array
June 8-13, 2014
Giardini Naxos, Italy
2014-01-01T00:00:00Z