Hydrodynamics of a quark droplet II: Implications of a non-zero baryon chemical potential

We present an extended version of the dynamical model for a multi-quark droplet evolution described in our proceeding paper. The model includes collective expansion of the droplet, effects of the vacuum pressure and surface tension, and now a non-zero baryon number. The hadron emission from the droplet is described following Weisskopf's statistical model. We consider evolutions of droplets with different initial temperatures and net baryon number. It is found that the introduction of a non-zero net baryon number does not change the lifetime of the droplets significantly. Only when we consider an initially very baryon-rich, low-temperature droplets is the lifetime is decreased significantly. We have, furthermore, found a convergence of both baryon chemical potential and temperature toward the values $\mu_{\rm B} \approx$ 450 MeV and $T \approx 150$ MeV. This convergence is linked to the competing emission of baryons versus mesons.Comment: 15 pages, 5 figure

"Closed-loop" analysis of a thermo-charged capacitor

In this Letter, an explicit application of conservation of energy and zero net work principle around a closed path ("closed-loop" analysis) is carried out on a thermo-charged capacitor at equilibrium with ambient heat at uniform temperature. This analysis corroborates the results of previous studies [Phys.Lett.A 374 (2010) 1801, Physica A 390 (2011) 481] that a potential drop $\Delta V$ does actually occur at capacitor terminals. Finally, a conventional photoelectric emission experiment is proposed to indirectly text thermo-charged capacitor functioning.Comment: 12 pages, 5 figures. Typos corrected. One section adde

Going for zero: state decarbonisation strategies for prosperity in a zero-emission world

This paper explains why states should have a decarbonisation strategy and explores some key policy elements. Abstract Across the world, governments at all levels are implementing policies to reduce carbon emissions, address local air pollution, improve energy productivity, grow new industries and address energy security concerns. While these initiatives are as yet insufficient to avoid dangerous climate change or achieve the internationally agreed goal of avoiding 2°C warming above pre-industrial levels, the trend is clear. What is also clear is the ultimate destination or strategic objective that these policies need to have: the progressive phase-out of emissions to reach net zero levels, or ‘decarbonisation’. The OECD, World Bank and latest IPCC report have warned that avoiding irreversible and severe climate change impacts will require the global economy to be decarbonised before the end of the century. This requires energy systems, particularly electricity, to decarbonise well before then. Private sector actors are also moving forward. Leading multinational business groups and corporate leaders have called for action to achieve net zero global emissions by 2050. The financial sector is increasingly aware of the risks of ‘stranded assets’ resulting from both global decarbonisation efforts and the physical impacts of climate change. In Australia recent political and policy turmoil saw state governments retreat from many past climate policy initiatives. However some governments are now reconsidering their position and the risks posed to their economies and communities should they be left behind by this global trend toward decarbonisation. This paper explains why states should have a decarbonisation strategy and explores these key policy elements: Setting binding emission limits on major emitting facilities Incorporating carbon considerations into policy and planning processes Using procurement and management policies to help build markets for lower emission goods and services Continuing to develop and link energy efficiency policy frameworks Providing assistance: funding, technical, regulatory, trainin

OCEAN CARBON SINKS AND INTERNATIONAL CLIMATE POLICY

Terrestrial sinks have entered the Kyoto Protocol as offsets for carbon sequestration, but ocean sinks have escaped attention. Ocean sinks are as unexplored and uncertain as were the terrestrial sinks at the time of negotiation. It is not unlikely that certain countries will advocate the inclusion of ocean carbon sinks to reduce their emission reduction obligations. We use a simple model of the international market for carbon dioxide emissions to evaluate who would gain or loose from allowing for ocean carbon sinks. Our analysis is restricted to information on anthropogenic carbon sequestration within the exclusive economic zone of a country. Like the carbon sequestration of business as usual forest management activities, natural ocean carbon sequestration applies at zero costs. The total amount of anthropogenic ocean carbon sequestration is large, also in the exclusive economic zones. As a consequence, it substantially alters the costs of emission reduction for most countries. Countries such as Australia, Denmark, France, Iceland, New Zealand, Norway and Portugal would gain substantially, and a large number of countries would benefit too. Current net exporters of carbon permits, particularly Russia, would gain less and oppose the inclusion of carbon sinks.carbon dioxide emission reduction, emission permit trade, exclusive economic zones, ocean sinks

Carrier-envelope phase control over pathway interference in strong-field dissociation of H2+_2^+

The dissociation of an H$_2^+$ molecular-ion beam by linearly polarized, carrier-envelope-phase-tagged 5 fs pulses at 4$\times10^{14}$W/cm$^2$ with a central wavelength of 730 nm was studied using a coincidence 3D momentum imaging technique. Carrier-envelope-phase-dependent asymmetries in the emission direction of H$^+$ fragments relative to the laser polarization were observed. These asymmetries are caused by interference of odd and even photon number pathways, where net-zero photon and 1-photon interference predominantly contributes at H$^+$+H kinetic energy releases of 0.2 -- 0.45 eV, and net-2-photon and 1-photon interference contributes at 1.65 -- 1.9 eV. These measurements of the benchmark H$_2^+$ molecule offer the distinct advantage that they can be quantitatively compared with \textit{ab initio} theory to confirm our understanding of strong-field coherent control via the carrier-envelope phase