Dual-Comb Gas Sensor Integrated with a Neural Network-Based Spectral Decoupling Algorithm of Overlapped Spectra for Gas Mixture Sensing.

Cross-interference among absorptions severely affects the ability to achieve accurate gas concentration retrieval through gas molecular specificity. In this study, a novel dual gas sensor was proposed to separate methane and water absorbance from the blended spectra of their mixture in the mid-infrared (MIR) band by employing a neural network algorithm. To address the scarcity of experimental data, the neural network was trained over a simulated data set constructed with the same distribution as the experimental ones. The system takes advantages of the broadband spectra to provide high-quality comb data and allows the neural network to establish an accurate spectral decoupling function. In addition, a feature absorption peak screening mechanism was proposed to achieve more accurate concentration retrieval, which avoids the prediction error introduced by interrogating the only peak of the separated spectra. The promising results of the systematic evaluation have demonstrated the feasibility of our methods in practical detections.

A new species of Micardia Butler, 1878 (Lepidoptera, Noctuidae, Eustrotiinae) from China.

The genus Micardia Butler, 1878 was described based on M. argentata (the type species; Fig. 1) and M. pulchra, both from Japan; in the same paper, Buter transferred a species described from India, Leucania pulcherrima Moore, 1867 to Micardia. Hampson (1990) considered Micardia a synonym of Eustrotia. However, its generic status was revised by Warren (1913) and retained by subsequent authors (Ueda 1984). There are at present 13 species recognized within Micardia (Table 1), of which, M. quadrilinea Scriba 1921 was described from Japan on the basis of female specimens and without high-quality illustrations, and subsequently treated as of uncertain status by Chen Xue (2012). The remaining species are as follows: M. simplicissima Berio 1973 was described from Myanmar based on 2 females. M. munda Leech, 1900, was described from Western China (Sichuan, according to Chen Xue 2012). Chen (1999) extended the range of M. pulcherrima to include China, and Chen Xue (2012) subsequently reviewed Micardia from China, describing three new species, M. pallens, M. distincta and M. minuta. Four species have been described from Madagascar, M. argentoidea and M. terracottoides by Berio (1954), and M. ikoly and M. itremo by Viette (1982). Because they are geographically separated so widely from their congeners in Asia, Chen Xue (2012) considered their generic placement in need of confirmation. Moreover, the distribution of M. pulchra Butler was extended to Russia (Kurile Island) by synonymizing it with M. pulchrargentea Bryk, 1942 (Kononenko 2005). In this paper we report a new species, Micardia yixingensis, sp. nov. from Jiangsu, China. The contribution brings the total number of the species in the genus to 14.