[en] The microstructure and mechanical properties of an as-extruded Mg-4.5Zn-1.1Ca (wt.%) alloy subjected to unidirectional rolling and cross-rolling were compared in the present study. The results indicated that rolling deformation refined the microstructure, dispersed second phases and modified the texture, which resulted in an improvement in the mechanical properties of the as-rolled alloys compared with those of the as-extruded alloy. The yield strength of the Mg-4.5Zn-1.1Ca (wt.%) alloy increased from 173 to 297 MPa after unidirectional rolling. The initial fragmented Ca₂Mg₆Zn₃ phases were further refined after rolling deformation, which clearly restricted the grain growth and gave rise to a fine microstructure. It was also found that rolling deformation intensified the basal texture in comparison with the as-extruded alloy, which was related to particle pinning.

[en] Highlights: • SCCPs and MCCPs were tested in 62 pairs of human hair and nails from North China. • CP concentrations in hair were significantly higher than those in nails. • The homologue profiles of CPs in hair were similar to those in nails. • The CP levels positively correlated with age for hair, whereas negative linear correlations were observed in nails. • Age and the MCCPs/SCCPs ratios might influence the accumulation of CPs in hair and nails. Most of the studies on short- and medium-chain chlorinated paraffins (SCCPs and MCCPs) in human tissues have focused on human milk and blood. However, little is known about the occurrence of CPs in human hair and nails. In this study, SCCPs and MCCPs were analyzed in 62 pairs of human hair and nails from North China. Median concentrations (range) of SCCPs and MCCPs in human hair were 239 (19.2–877) and 325 (16.9–893) ng/g dw, respectively, all of which were significantly higher than 154 (57.7–355) and 233 (61.0–476) ng/g dw, respectively, in nail samples (p < 0.05). The homologue profiles of CPs in human hair were similar to those in nails, where SCCPs and MCCPs were dominated by C₁₀Cl_6–7 and C₁₄Cl_7–8, respectively. A significant positive relationship was observed between CP levels and age of people for hair, whereas negative linear correlations were observed for nails. The redundancy analysis indicated that age of people might be the main influencing factor on the accumulation of CPs in hair and nails. The present study performed comprehensive evaluation of CP exposure levels in human hair and nail and highlights the need for more data on relationship between internal and external exposure to CPs.

[en] Highlights: • The texture intensity in the Mg-Zn alloy relied on the microstructure. • Fine DRXed grains showed a fiber texture distributing between <10.0> and <11.0>. • Coarse DRXed grains mainly exhibited <11.0> fiber texture. • The preferred growth of <11.0> oriented grains resulted in texture evolution. - Abstract: The microstructure and texture evolution of Mg-Zn alloy during recrystallization was investigated by EBSD in the present study. Deformed region, fine DRXed region and coarse DRXed region were obtained in Mg-Zn alloy during deformation. It was found that the texture intensity in DRXed region was weaker compared with the deformed region. The second phase at grain boundaries resulted in the formation of fine DRXed grains with weaker texture compared with the coarse DRXed region. Additionally, a remarkable grain-size driven textural transition from <10.0>–<11.0> texture to <11.0> texture were detected with the growth of DRXed grains. The recrystallized grains with small grain size showed a fiber texture distributing homogeneously between <10.0> and <11.0>, while <11.0> fiber texture was predominant for the large recrystallized grains. It is suggested that <11.0> oriented grains grew faster than other oriented grains, which was ascribed to larger misorientation between <11.0> oriented grains and their neighboring grains.

[en] This paper characterizes the Single Event Effect (SEE) sensitivities of the Serializer/Deserializer (SerDes) module on the advanced 28 nm Xilinx Kintex-7 Field Programmable Gate Array (FPGA). A systematical SEE measurement method is proposed and implemented to evaluate the SEE sensitivity of the SerDes circuits. In our experiments, an extremely low Single Event Upset (SEU) Linear Energy Transfer (LET) threshold of the SerDes circuits was investigated, and both the recoverable and unrecoverable Single Event Functional Interrupts (SEFIs) were clearly distinguished and classified. In the experiments, it was found that the SEUs and recoverable SEFIs of the TX and RX in the same channel were closely related due to their shared clock and control circuits. Based on this detailed survey, a further discussion of the mechanisms of the SEU, recoverable SEFI, and unrecoverable SEFI is also provided. The SEE sensitivity of the high-speed SerDes circuits presented in this paper will promote the effective utilization of error mitigation strategies in order to control the risks of applications in radiation environments.