The CR/SBS composite-modified asphalt (CR/SBS-CMA) is recognized for its excellent rutting and fatigue resistance, but with poor workability. Sasobit has been introduced as an additive to improve the workability of CR/SBS-CMA. This study aims to investigate the effects of Sasobit content on the storage stability and rheological properties of CR/SBS-CMA. The Brookfield viscosity tests were used to measure the viscosity of samples. The Fourier transform infrared spectroscopy (FTIR) tests were conducted to study the modification mechanism. The cigar tube and fluorescence microscopy (FM) tests were employed to study the storage stability of samples. The penetration, softening point, and ductility of samples were assessed. The rheological behaviors of samples were assessed through dynamic shear rheometer (DSR) tests and bending beam rheometer (BBR) tests. The test results indicate that Sasobit can effectively reduce the viscosity of CR/SBS-CMA. Sasobit can also improve the rutting resistance, fatigue resistance, and storage stability of CR/SBS-CMA. However, Sasobit negatively affects the low-temperature performance of CR/SBS-CMA, so its content should be lower than 3 % when applied in areas with low temperatures. This study will contribute to the reduction of energy consumption and greenhouse gas emissions during the construction of CR/SBS-CMA pavement.

Layered hybrid perovskites comprising adamantyl spacer (A) cations based on the A₂FA_n−1Pb_nI_3n+1(n= 1-3, FA = formamidinium) compositions have recently been shown to act as promising materials for photovoltaic applications. While the corresponding perovskite solar cells show performances and stabilities that are superior in comparison to other layered two-dimensional formamidinium-based perovskite solar cells, the underlying reasons for their behaviour are not well understood. We provide a comprehensive investigation of the structural and photophysical properties of this unique class of materials, which is complemented by theoretical analysisviamolecular dynamics simulations and density functional theory calculations. We demonstrate the formation of well-defined structures of lower compositional representatives based onn= 1-2 formulations with (1-adamantyl)methanammonium spacer moieties, whereas higher compositional representatives (n> 2) are shown to consist of mixtures of low-dimensional phases evidenced by grazing incidence X-ray scattering. Furthermore, we reveal high photoconductivities of the corresponding hybrid perovskite materials, which is accompanied by long charge carrier lifetimes. This study thereby unravels features that are relevant for the performance of FA-based low-dimensional hybrid perovskites.

A 400-MHz/2.4-GHz combo transceiver (TRX) integrated chip (IC) Supporting simultaneous dual-band communication is designed and fabricated in a 65-nm CMOS technology for compact wireless personal area network applications. The IC is composed of a 3-10 Mb/s quadrature phase shift keying (QPSK)/offset QPSK (OQPSK) TRX working at the 400-500 MHz band, and a 1-3 Mb/s Gaussian frequency shift keying (GFSK)/half sine OQPSK (HS-OQPSK) TRX at the 2.4-2.4835 GHz band for the Bluetooth low energy/IEEE 802.15.4 protocols. The presented combo TRX IC requires one single antenna without any bidirectional RF coupler, to support simultaneous dual-band communication. Two key circuit techniques, namely, the combination biasing technique to suppress the high-order harmonics and the active in-band interference cancellation, are adopted to tackle the crosstalk interference between the two bands during simultaneous dual-band operation. Measurement results show that the in-band interference presented to the 2.4-GHz receiver due to the 400-MHz transmitter is suppressed by 19 dB with the presented design techniques.