Measurement of the Charged Multiplicities in b, c and Light Quark Events from Z0 Decays

Average charged multiplicities have been measured separately in $b$, $c$ and light quark ($u,d,s$) events from $Z^0$ decays measured in the SLD experiment. Impact parameters of charged tracks were used to select enriched samples of $b$ and light quark events, and reconstructed charmed mesons were used to select $c$ quark events. We measured the charged multiplicities: $\bar{n}_{uds} = 20.21 \pm 0.10 (\rm{stat.})\pm 0.22(\rm{syst.})$, $\bar{n}_{c} = 21.28 \pm 0.46(\rm{stat.}) ^{+0.41}_{-0.36}(\rm{syst.})$ $\bar{n}_{b} = 23.14 \pm 0.10(\rm{stat.}) ^{+0.38}_{-0.37}(\rm{syst.})$, from which we derived the differences between the total average charged multiplicities of $c$ or $b$ quark events and light quark events: $\Delta \bar{n}_c = 1.07 \pm 0.47(\rm{stat.})^{+0.36}_{-0.30}(\rm{syst.})$ and $\Delta \bar{n}_b = 2.93 \pm 0.14(\rm{stat.})^{+0.30}_{-0.29}(\rm{syst.})$. We compared these measurements with those at lower center-of-mass energies and with perturbative QCD predictions. These combined results are in agreement with the QCD expectations and disfavor the hypothesis of flavor-independent fragmentation.Comment: 19 pages LaTex, 4 EPS figures, to appear in Physics Letters

Mathematical Modeling of Furnace Drainage While Tapping Slag and Metal Through a Single Tap-Hole

Furnace tapping is a critical operation on pyrometallurgical furnaces known for unpredictable performance in many cases. A reduced order mathematical model capable of predicting tapping rates of both slag and metal is presented. The model accounts for separate liquid phases and particle bed resistance to flow. The model is compared for consistency against results from both a water-model experiment and computational fluid dynamics simulations. The model is applied to study drainage from a typical ferro-manganese furnace. The model results show that particle bed conditions in the immediate vicinity of the tap-hole strongly influence tapping rates and that the slag/metal interface deformation due to suction pressure near to the tap-hole is significant and must be accounted for in such modelspublishedVersio

Modeling and Simulation of Electric Propulsion Concepts for a Multimodal Prototype Demonstrator

The Office of Naval Research (ONR) is planning a prototype demonstration of a novel craft envisioned to have three modes of operation: Fuel-efficient, good sea keeping mode for open ocean transits, High-speed, shallow water mode, Amphibious mode to enable “feet dry on thebeach” capability The disparate operating modes impose discrete requirements on the various elements of the ship propulsion system, opening a wide range of potential solutions. To meet these requirements, each of the contractor teams involved in the T-Craft program is investigating the potential use of advanced electric drive technologies, including medium voltage dc distribution systems. The Electric Ship Research and Development Consortium (ESRDC) conducted a technical evaluation of three electric drive options. This paper discusses the modeling and simulation activities conducted during the initial technical evaluations of the electric drive concepts as well as challenges and potential solutions for higher fidelity modeling of the complex propulsion power systems.Center for Electromechanic

Global forest discourses must connect with local forest realities

Numerous inter-governmental conservation initiatives have failed to halt the loss and degradation of forests. This paper explores the role of policy processes in developing and delivering desired future forest outcomes that meet both global environmental goals and the needs of local forest users. There is a clear disconnect between global commitments and local interventions to achieve forest outcomes. There is an incoherence in forest policy development at different spatial scales. Future forest governance needs to recognise the diversity of actors in the policy process and the complexity of local forest contexts. New actors in the policy process will include knowledge brokers and policy entrepreneurs who increasingly shape the policy discourse. There is also a need for policy durability and problem focused policy-learning pathways. Forest and allied sciences continue to be critical for delivering desired forest outcomes, and learning from the diversity of local contexts is critical to creating effective and coherent policies

Global forest discourses must connect with local forest realities

Numerous inter-governmental conservation initiatives have failed to halt the loss and degradation of forests. This paper explores the role of policy processes in developing and delivering desired future forest outcomes that meet both global environmental goals and the needs of local forest users. There is a clear disconnect between global commitments and local interventions to achieve forest outcomes. There is an incoherence in forest policy development at different spatial scales. Future forest governance needs to recognise the diversity of actors in the policy process and the complexity of local forest contexts. New actors in the policy process will include knowledge brokers and policy entrepreneurs who increasingly shape the policy discourse. There is also a need for policy durability and problem focused policy-learning pathways. Forest and allied sciences continue to be critical for delivering desired forest outcomes, and learning from the diversity of local contexts is critical to creating effective and coherent policies

Governing the landscape: potential and challenges of integrated approaches to landscape sustainability in Indonesia

In recent years, landscape sustainability, the maintenance and improvement of biodiversity, ecosystem services, and human well-being in landscapes, has become a core objective of conservation initiatives. Yet efforts to promote sustainability often conflict with other landscape objectives. Globally, integrated landscape approaches have emerged as desirable processes for reconciling these conflicts. Integrated landscape approaches seek to foster improvements in landscape-scale governance to meet sustainability objectives. As scientific and political support for these new landscape approaches continues to advance internationally, there is a need to learn from the processes, constraints, and opportunities. We seek to enrich understandings of landscape approaches and their contributions to governance and sustainability through conserving biodiversity and maintaining ecosystem services. Focusing on eight case studies at different stages of development in Indonesia, we explore how practitioners influence landscape sustainability through integrated approaches. We used questionnaires and literature to collect information on objectives, attributes and challenges of landscapes approaches. We find landscape approaches in Indonesia closely reflect guidance principles. Emerging lessons from landscapes include adapting strategies to local priorities for inclusive problem-framing and engaging in nested learning systems. Aligning landscape actions with policy for coherent governance across scales remains a key challenge. Creating and maintaining governance that supports landscape sustainability is a core principle of landscape approaches. Establishing institutional arrangements for landscape sustainability will require working across legislative and political boundaries for coordinated action. We highlight the need to document and measure impact, and the potential for future learning from landscape sustainability science