Results 251 to 260 of about 70,117 (304)

Observation of Two‐Photon Resonant Raman Scattering via the Biexciton Level in Two‐Dimensional Halide Perovskite (C6H5C2H4NH3)2PbI4

Advanced Functional Materials, EarlyView.
Efficient two‐photon resonant Raman scattering (TRRS) is observed in the layered perovskite (PEA)2PbI4, with the biexciton level acting as an intermediate state. TRRS undergoes two‐photon frequency shift upon input frequency tuning, persists up to 90 K, and shows clear threshold behavior and polarization selection rules.
Seung Han Shin, Seo Hyun Nam, Jeehong Park, Dong Gyu Lee, Jeong Bin Cho, Tae Jung Kim, Yeonjin Yi, Joon Ik Jang   +7 more
wiley   +1 more source

Sensing While Drilling and Intelligent Monitoring Technology: Research Progress and Application Prospects. [PDF]

Sensors (Basel)
Li X, Yao Z, Zhang T, Chang Z.
europepmc   +1 more source

Editorial: Anthropogenic effects on the microbial communities of terrestrial ecosystems. [PDF]

Front Microbiol
Song W, Xiang X, Wang J, Radosevich M, Lin Y.   +4 more
europepmc   +1 more source

The Effects of Forest Harvesting on Total and Methylmercury Concentrations in Surface Waters Depend on Harvest Practices and Physical Site Characteristics. [PDF]

Environ Sci Technol
Eklöf K, de Wit H, Eckley CS, Eagles-Smith CA, Eggert SL, Mackereth RW, Skyllberg U, Ukonmaanaho L, Verta M, Allan C, Emilson EJS, Kidd KA, Mitchell CPJ, Munthe J, Sallantaus T, Segersten J, Bravo AG, Kolka RK, McCarter CPR, Porvari P, Ring E, Sebestyen SD, Sikström U, Zetterberg TS.   +23 more
europepmc   +1 more source

The role of Cacao agroforests in the genetic conservation of Cariniana legalis, an emblematic species of the atlantic forest. [PDF]

BMC Ecol Evol
Santos AS, Leal JB, Corrêa RX, Gramacho KP, Gaiotto FA.   +4 more
europepmc   +1 more source

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Biodiversity Despite Selective Logging

Science, 2013
[Extract] Primary tropical forests are powerhouses of biodiversity but are rapidly declining in extent and are threatened even within some protected areas. As a result, non-primary forests, especially those that have been selectively logged, are becoming more important to conservation efforts.
Edwards, David P., Laurance, William F.
openaire   +3 more sources

Selective Logging in the Brazilian Amazon

Science, 2005
Amazon deforestation has been measured by remote sensing for three decades. In comparison, selective logging has been mostly invisible to satellites. We developed a large-scale, high-resolution, automated remote-sensing analysis of selective logging in the top five timber-producing states of the Brazilian Amazon.
Gregory P, Asner, David E, Knapp, Eben N, Broadbent, Paulo J C, Oliveira, Michael, Keller, Jose N, Silva   +5 more
openaire   +2 more sources

Table selection and log-linear models

Journal of Chronic Diseases, 1980
Abstract The use of multi-dimensional contingency tables has become commonplace in the analysis of epidemiological data. This paper examines two problems in this methodology. First, for data having many response or dependent variables, it is often unclear as to which of many possible tables should be analyzed.
D H, Freeman, J F, Jekel
openaire   +2 more sources

Strategies for the Selection of Log-Linear Models

Biometrics, 1978
In a multidimensional contingency table strategies have been proposed to build log-linear models using either stepwise methods or standardized estimates of the parameters of the saturated model. Brown (1976) proposed a two-step procedure to screen effects and then test a subset of models.
Benedetti, Jacqueline K., Brown, Morton B.   +1 more
openaire   +2 more sources

Spruce-Fir Selective Logging Costs

Journal of Forestry, 1942
Abstract The economic feasibility of partial cutting methods is not commonly accepted. In spruce-fir stands of pulpwood size in the Northeast, logging with horses on partial cuttings removing 10 to 60 percent of the stand shows that costs do not exceed clear-cutting costs, with strong indications that selective cutting will become ...
K. T. Belotelkin, L. H. Reineke, M. Westveld   +2 more
openaire   +1 more source