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This paper reports a high-performance transparent electromagnetic shielding material based on an ultrathin and large-area metallic nanomesh, which was fabricated by a facile and rational process utilizing ultraviolet lithography and the ion beam etching technique. Measurements reveal that a single-layer metallic nanomesh can harvest excellent shielding effectiveness exceeding 40 dB in the wide frequency range from 500 MHz to 40 GHz. Besides, efficient light transmittance (85% at 550 nm) is achieved in both visible and near-infrared regions. Furthermore, the proposed structure remains excellent performance at wide incident angles even up to 50°. Hence, it is believed that this metallic nanomesh with easy fabrication can be a potential alternative in the transparent electromagnetic shielding domain.

The distributions of cosmogenic nuclide10Be in the upper and lower salt units from a core (36.4°N, 94.5°E) in the Chaidamu Basin, Qinghai, China have been measured by means of accelerator-mass spectrometer. The comparison of these10Be results measured on salt and detritus fractions shows that the geochemical behaviour of10Be is detritus-phile. In this area10Be influx is different in the past tens of thousands of years, which is suggested to be related to climatic fluctuations during late Pleistocene. It seems that10Be influx is higher in the humid climate environnent than in the dry climate environment. The230Th-age estimates of two salt units have been determined. The corrected ages of the lower unit show a climate shift from humid to dry at about 50 Ka ago in this area.