selective property
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2021 ◽  
pp. 019145372110405
Author(s):  
William E. Scheuerman

Climate activists have recently engaged in widely publicized acts of politically motivated lawbreaking. This article identifies and critically analyzes two seemingly overlapping but in fact diverging approaches among present-day activists. Though their illegal acts (e.g., blockades, occupations, and selective property damage) sometimes appear equivalent, the rival approaches place them in contrasting lights; the resulting differences are normatively and politically consequential. The first and now predominant approach favors nonviolent civil disobedience, understood in conventional terms as civil, conscientious, nonviolent, public lawbreaking. Though this approach exhibits many strengths, its proponents sometimes rely on problematic usages of recent political science scholarship that cannot withstand critical scrutiny. The second approach views nonviolent civil disobedience as insufficiently militant and instead aims primarily to block and disrupt our fossil fuel-driven political economy. Its preferred mode of political illegality is sabotage. Less concerned than the first approach with altering public opinion, it generally writes off the prospect of meaningful political reform. Though both approaches rely on the idea of a “climate emergency” to justify their activities, the second approach provides a vivid warning of its possible dangers. Although the momentous threats posed by global warming are undeniable, the idea of a climate emergency risks opening the door to political avant-gardism and, potentially, authoritarianism.


Coatings ◽  
2021 ◽  
Vol 11 (4) ◽  
pp. 439
Author(s):  
Li Wan ◽  
Yinghua Wei ◽  
Hongtao Zhao ◽  
Haijiao Cao ◽  
Jing Li

Corrosion behavior of epoxy-coated rebar with different size of microdefects in uncarbonated/carbonated simulated pore solution (U/CSPS) of seawater concrete was investigated. Specimens in both solutions underwent two stages of corrosion, according to the electrochemical impedance spectroscopy (EIS) response. The initial stage was the extension of corrosion. The second stage was dominated by the diffusion process, due to the corrosion products blocking the defects and hindering the transportation of the reaction matter. Local electrochemical impedance spectroscopy (LEIS), scanning vibrating electrode technique (SVET) measurements and the observation of corrosion products indicated that 50 μm might be the threshold, because the corrosion of specimens with defects bigger than 50 μm in diameter was significantly more severe. Crevice corrosion was identified to occur in the experiments. The corrosion products of specimens in USPS and CSPS were mainly Fe3O4 and FeOOH, respectively. α-FeOOH and β-FeOOH exhibited an anion ion-selective property in the corrosion process, which induced crevice corrosion in CSPS. In particular, it is contended herein that Fe3O4 has the cation ion-selective property to protect the substrate in USPS.


2021 ◽  
Vol 29 (2) ◽  
pp. 1251
Author(s):  
Xu Han ◽  
Huifu Xiao ◽  
Yongheng Jiang ◽  
Guanghui Ren ◽  
Pu Zhang ◽  
...  

Nanophotonics ◽  
2018 ◽  
Vol 7 (5) ◽  
pp. 853-858 ◽  
Author(s):  
Hao Jia ◽  
Ting Zhou ◽  
Xin Fu ◽  
Jianfeng Ding ◽  
Lei Zhang ◽  
...  

AbstractIn this paper, we propose and demonstrate a five-port optical router based on mode-selective property. It utilizes different combinations of four spatial modes at input and output ports as labels to distinguish its 20 routing paths. It can direct signals from the source port to the destination port intelligently without power consumption and additional switching time to realize various path steering. The proposed architecture is constructed by asymmetric directional coupler based mode-multiplexers/de-multiplexers, multimode interference based waveguide crossings and single-mode interconnect waveguides. The broad optical bandwidths of these constituents make the device suitable to combine with wavelength division multiplexing signal transmission, which can effectively increase the data throughput. Measurement results show that the insertion loss of its 20 routing paths are lower than 8.5 dB and the optical signal-to-noise ratios are larger than 16.3 dB at 1525–1565 nm. To characterize its routing functionality, a 40-Gbps data transmission with bit-error-rate (BER) measurement is implemented. The power penalties for the error-free switching (BER<10−9) are 1.0 dB and 0.8 dB at 1545 nm and 1565 nm, respectively.


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