Biomolecular nanopatterns can be quickly fabricated over a large area with a resolution down to 10 nm by magnetic electric lithography, as reported by Z. Gu, S. Huang, and Y. Chen in their Communication on Magnetic nanoparticles coated with multiple distinct biomolecules are deposited by a magnetic field and immobilized onto nanoelectrodes by an electric field to generate arbitrary heterogeneous biomolecular nanopatterns, which can then be printed onto polymer films for diverse biomedical applications.

Abstract:Monitoring of winding faults is the most important item used to determine the maintenance status of a transformer. Commonly used methods for winding-fault diagnosis require the transformer to exit operation before testing and an external exciting signal, whether the transformer is malfunctioning or not. However, if an overvoltage signal can be regarded as a broadband excitation source for fault diagnosis, then the interference caused by signal injection can be eliminated without the need for additional pulse or impulse signals. In this paper, a tapped transformer is designed and test platforms are built to compare winding diagnoses using the impulse wave and sweep frequency response analysis methods by recording voltage responses on both the high-and low-voltage sides and calculating the respective transfer functions. Based on comparison of statistical indicators, it is found that the sensitivities of both methods are similar for detecting conditions of winding-ground and winding-interlayer short circuits. It is concluded that it is feasible to use a transient overvoltage monitoring system for winding-fault diagnosis.

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We analyze the security of asymmetric group key agreement (ASGKA) protocol in the universal composability (UC) framework. An ideal functionality that is suitable for ASGKA protocol is proposed. And we show that the ASGKA protocol securely realizes the proposed ideal functionality that can resist attacks by malicious insiders. The UC framework allows the protocols to guarantee their security under arbitrary protocol environment.