Search

Organic photodetectors (OPDs) have attracted immense interest as solution‐processable optical signal‐capturing devices due to their various advantages, such as adjustable response range, excellent weak light response, lightweight, flexibility, and ease of processing on diverse substrates. Low dark current density (Jd) and high responsivity (R) are key requirements necessary for achieving a high specific detectivity (D*). Here, an effective strategy for preparing high‐performance OPDs with potential micro p‐i‐n structure by introducing insulating poly(aryl ether) (PAEN) into the organic photosensitive layer is reported. The PM6:PC71BM‐based OPDs are capable of significantly suppressing Jd while increasing R, which can be attributed to the multiple optimizations of morphology and charge transport caused by the addition of PAEN. As a result, the value of Jd (3.63 × 10−10 A cm−2) is two orders of magnitude lower than that of the device without PAEN (1.00 × 10−8 A cm−2) at −1 V bias. Combined with the increased R of 0.376 A W−1, the optimized device achieves a high D*of 3.45 × 1013 Jones (−1 V at 620 nm). The optimized OPDs demonstrate high performance that is comparable to commercial Si photodetectors (Hamamatsu S1133), paving the way for the direct market development of this cost‐effective organic photodetection technology. [ABSTRACT FROM AUTHOR]

Several results about the game of cops and robbers on infinite graphs are analyzed from the perspective of computability theory. Computable robber-win graphs are constructed with the property that no computable robber strategy is a winning strategy, and such that for an arbitrary computable ordinal α , any winning strategy has complexity at least 0 (α) . Symmetrically, computable cop-win graphs are constructed with the property that no computable cop strategy is a winning strategy. Locally finite infinite trees and graphs are explored. The Turing computability of a binary relation used to classify cop-win graphs is studied, and the computational difficulty of determining the winner for locally finite computable graphs is discussed. [ABSTRACT FROM AUTHOR]

Electronic information engineering has the high request to the engineering practice ability. Under the guidance of the college's specialized practical ability training "roadmap", the reform of the practical teaching method of electronic information engineering is becoming increasingly urgent. This paper focuses on the construction of effective innovation strategies on electronic information engineering specialized practical teaching, and the connection of the social demands, the ability training of students and the practice teaching resources. In order to truly realize the training goal of the college' "compound talents", we must take the college specialized practical ability training "road map" as the guidance, take the student as the main body, and pay attention to the combination of theory and practice, and the combination of in class and after class. Practice has been proved that the practical innovative strategies guidance by the "road map" is effective, and the students' creative ability has been greatly improved. [ABSTRACT FROM AUTHOR]

The white-backed planthopper (WBPH) Sogatella furcifera is one of the most harmful pests of rice in Southeast Asia. The fat body of WBPH harbors intracellular yeast-like symbionts (YLS). YLS are vertically transmitted to WBPH offspring by transovarial infection. YLS play an important role in the WBPH life cycle. YLS diversity and function have been extensively studied in the brown planthopper (BPH) and small brown planthopper but not in WBPH, even though a novel strategy for controlling the BPH based on suppressing YLS has been proposed. Here, using denaturing gradient gel electrophoresis, we identified 12 unique fungal sequences among YLS of WBPH, and five of them represented uncultured fungi. We then fed WBPH with rice plants treated with different fungicides [70% propineb wettable powder (WP) (PR), 70% propamocarb hydrochloride aqueous solution (AS) (PH), 25% trifloxystrobin and 50% tebuconazole water-dispersible granules (WG) (TT), 40% pyrimethanil suspension concentrate (SC) (PY), and 50% iprodione SC (IP)] and evaluated their effects on YLS abundance and WBPH survival rate. Both YLS abundance and adult WBPH survival rate were significantly decreased upon feeding fungicide-treated rice plants, and exposure to 50% IP resulted in the strongest reduction. The abundance of two Sf-YLS species (Ascomycetes symbiotes and Cla-like symbiotes) was significantly reduced upon exposure to 50% IP. The counts of Ascomycetes symbiotes, the most abundant YLS species, were also suppressed by the other fungicides tested. In conclusion, 50% IP was the most effective fungicide, reducing YLS abundance and WBPH survival rate under controlled conditions, suggesting its potential use to control WBPH. [ABSTRACT FROM AUTHOR]