Chinese Academy of Sciences
It is always exciting to find new isotopes with extreme neutron/proton numbers in nuclear physics research. In the region of heavy nuclei, α-decay is one of the pervasive decay modes and plays an essential role in searching for new isotopes. However, even after about a century of studying α-decay, scientists still cannot perfectly describe how the α-particle is formed at the surface of the nucleus before its emission.
In the α-decay process, the α-particle can be regarded not only as two protons plus two neutrons, but also as two proton-neutron pairs. Although previous studies have proved the importance of the pairing forces between the identical nucleons, it remains unclear whether the strong proton-neutron interactions have an impact on α-decay properties, especially in the heavy nuclear region.
IMAGE:
60Fe yield in 18 solar mass star. Blue lines (LMP) are calculations based on previous decay rate, red lines (present work) are those based on the new measurement.. view more
Credit: Physical Review Letters
Researchers from the Institute of Modern Physics (IMP) of the Chinese Academy of Sciences and their collaborators have recently made great progress in the study of the stellar beta-decay rate of
59Fe, which constitutes an important step towards understanding
60Fe nucleosynthesis in massive stars. The results were published in
Physical Review Letters on April 12.
Radioactive nuclide
60Fe plays an essential role in nuclear astrophysical studies. It is synthesized in massive stars by successive neutron captures on a stable nucleus of
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IMAGE: a, PE rates at endogenous on-target and off-target sites. b, Experimental design and work flow of whole-genome sequencing. c, d, Numbers of SNVs (c) and Indels (d) identified by WGS. view more
Credit: IGDB
Prime editing (PE), a search-and-replace CRISPR-based genome editing technique, has great potential for gene therapy and agriculture. It can introduce desired base conversions, deletions, insertions, and combination edits into target genomic sites. Prime editors have been successfully applied in animals and plants, but their off-target effects, which can be a major hindrance to real-life application, have not been thoroughly evaluated until now.
Prof. GAO Caixia from the Institute of Genetics and Developmental Biology (IGDB) of the Chinese Academy of Sciences (CAS) and her research team recently performed a comprehensive and genome-wide analysis of the off-target effects of PEs in rice plants.
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10 values derived from multiyear observations at 74 FLUXNET sites spanning diverse climates and biomes. We found warming-induced decline in
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10 is stronger at colder regions than other locations, which is consistent with a meta-analysis of 54 field warming experiments across the globe. We predict future warming will shrink the global variability of
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10 values to an average of 1.44 across the globe under a high emission trajectory (RCP 8.5) by the end of the century. Therefore, warming-induced carbon loss may be less than previously assumed because of
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INTRODUCTION
Terrestrial ecosystem respiration (
Re), the sum of autotrophic respiration from primary producers and heterotrophic respiration from consumers and detritivores, represents a fundamental biospheric function and plays a major role in the global carbon cycle and growth rate of atmospheric CO
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Home > Press > Scientists observe role of cavitation in glass fracturing
Fig. 1. Observation of the cavitation-dominated crack propagation in a metallic glass.
CREDIT
Institute of Physics
Abstract:
Glassy materials play an integral role in the modern world, but inherent brittleness has long been the Achilles heel that severely limits their usefulness. Due to the disordered amorphous structure of glassy materials, many mysteries remain. These include the fracture mechanisms of traditional glasses, such as silicate glasses, as well as the origin of the intriguing patterned fracture morphologies of metallic glasses.
Scientists observe role of cavitation in glass fracturing
Beijing, China | Posted on April 2nd, 2021