28 Result(s)
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Article
Michael Köhl
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Reliability of differing densities of sample grids used for the monitoring of forest condition in Europe
Concern about the possible deterioration of forest health led to the establishment in the 1980s of inventories of forest condition throughout Europe. International standardisation of the programmes was sought ...
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Harmonisation and Standardisation in Multi-National Environmental Statistics – Mission Impossible?
Multi-national statistics are frequently based on data, whichoriginate from national surveys. The systems of nomenclatureapplied for key attributes often show national differences.Different error sources which...
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A Variance Estimator for Constrained Estimates of Change in Relative Categorical Frequencies
Consistent estimators of change and state becomes an issue when sample data come from a mix of permanent and temporary observation units. A joint maximum likelihood estimator of state and change creates estima...
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Cavity QED with a Bose–Einstein condensate
A central goal of physics is to understand the interaction between matter and light. In cavity quantum electrodynamics, an optical resonator can be used to enhance this interaction for atoms. Previous studies ...
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Open AccessReduced emissions from deforestation and forest degradation (REDD): a climate change mitigation strategy on a critical track
Following recent discussions, there is hope that a mechanism for reduction of emissions from deforestation and forest degradation (REDD) will be agreed by the Parties of the UNFCCC at their 15th meeting in Cop...
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A trapped single ion inside a Bose–Einstein condensate
Until now, quantum atomic gases and single trapped ions have been treated separately in experiments. Now a team from the Cavendish Laboratory in Cambridge has combined the two, in the form of a hybrid quantum ...
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Open AccessCombating the effects of climatic change on forests by mitigation strategies
Forests occur across diverse biomes, each of which shows a specific composition of plant communities associated with the particular climate regimes. Predicted future climate change will have impacts on the vul...
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Open AccessImplications of sampling design and sample size for national carbon accounting systems
Countries willing to adopt a REDD regime need to establish a national Measurement, Reporting and Verification (MRV) system that provides information on forest carbon stocks and carbon stock changes. Due to the...
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Observation of a pairing pseudogap in a two-dimensional Fermi gas
Observation of a many-body pairing gap in a trapped, 2D atomic Fermi gas shows that ultracold atomic gases can be used to emulate the physics of correlated 2D superconductors, with the ultimate goal of underst...
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Attractive and repulsive Fermi polarons in two dimensions
Investigations of a two-dimensional spin-imbalanced Fermi gas reveal the existence of the Fermi polaron for attractive and repulsive interactions, and the transition from the attractive polaron to a molecule.
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Controlling chemical reactions of a single particle
Chemical reactions between a single trapped ion and a condensate of ultracold neutral atoms are investigated by controlling the quantum states of both ion and atoms—revealing the effect of the hyperfine intera...
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Universal spin dynamics in two-dimensional Fermi gases
Experiments with ultracold atomic gases can provide insight into more general phenomena, such as spin transport. A study of spin diffusion in a two-dimensional Fermi gas measured the lowest spin diffusion cons...
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Open AccessThe global climate change mitigation strategy REDD: monitoring costs and uncertainties jeopardize economic benefits
REDD (Reducing Emissions from Deforestation and Forest Degradation) has been suggested as a climate change mitigation strategy that is based on the philosophy to reward countries for reducing their deforestati...
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Correction: Corrigendum: Universal spin dynamics in two-dimensional Fermi gases
Nature Phys. 9, 405–409 (2013); published online 26 May 2013; corrected online 4 June 2013; corrected after print 23 December 2013 In the version of this Letter originally published, the stated value for the d...
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Error propagation in stock-difference and gain–loss estimates of a forest biomass carbon balance
According to the United Nations International Panel on Climate Change good practice guidance, an annual forest biomass carbon balance (AFCB) can be estimated by either the stock-difference (SD) or the gain–lo...
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Open AccessAvoiding treatment bias of REDD+ monitoring by sampling with partial replacement
Implementing REDD+ renders the development of a measurement, reporting and verification (MRV) system necessary to monitor carbon stock changes. MRV systems generally apply a combination of remote sensing techn...
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Open AccessModeling the CO2-effects of forest management and wood usage on a regional basis
At the 15th Conference of Parties of the UN Framework Convention on Climate Change, Copenhagen, 2009, harvested wood products were identified as an additional carbon pool. This modification eliminates inconsisten...
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Open AccessHarvested wood products and REDD+: looking beyond the forest border
The focus of REDD+ is sensu stricto on maintaining forest carbon stocks. We extend the scope of sustainable management of forest from forests to timber utilization, and study carbon offsets resulting from the ...
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Monolayer graphene as dissipative membrane in an optical resonator
We experimentally demonstrate coupling of an atomically thin, free-standing graphene membrane to an optical cavity. By changing the position of the membrane along the standing-wave field of the cavity, we tail...
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Open AccessCarbon recovery following selective logging in tropical rainforests in Kalimantan, Indonesia
The knowledge gap regarding post-logging carbon recovery by increased growth is becoming more crucial to understand the significant contribution of forest to climate change mitigation. We assessed the ability ...
