Trust and prices are two factors of organic food purchasing intention and behaviour, which have been received more attention. However, the research of the former failed to address the role of trust in stakeholders, and findings of the latter did not make consistent. This study incorporates trust in producers, trust in retailers, and price sensitivity into an extended theory of planned behaviour (TPB) to examine their effects on consumers' organic food purchasing behaviour (OFP). We conducted an online survey and obtained data from 640 consumers in China to empirically test the model. The results show that the two types of trust play essential roles in OFP, and the impact of trust in retailers is stronger than that of trust in producers. Moreover, price sensitivity is a negative factor of OFP. Furthermore, trust in producers and trust in retailers significantly strengthen the relationships between OFP and its antecedents from the extended TPB model. In addition, price sensitivity acts as a negative moderator on the relationships between perceived behaviour control and OFP, as well as purchase intention and OFP, while the moderating effect of price sensitivity on the relationship between personal norms and OFP has not been established.

Changing human behavior is critical to mitigating the increasingly severe environmental harm. Although numerous studies focus on private-sphere or generalized pro-environmental behavior (PEB), relatively little research examines explicitly public-sphere PEB from a collective action perspective. This study incorporates trust and identity into the Attitude-Behavior-Context (ABC) theory to investigate Chinese residents’ participation in public-sphere PEB. Primary data collected from 648 residents in China tested the model empirically. The results indicate that social trust, environmentalist self-identity, and politicized identity positively predict public-sphere PEB and that institutional trust positively impacts non-activist behaviors but negatively relates to environmental activism. There is also evidence that trust and identity are moderators of attitude and public-sphere PEB. Specifically, social trust and environmentalist self-identity strengthen the effect of attitude on public-sphere PEB. Politicized identity increases the impact of attitude on environmental activism but not on non-activist behaviors, and there is no significant moderating effect of institutional trust. The findings deepen the understanding of public-sphere PEB and make more targeted policies accordingly.

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To detect and receive the high dynamic and high information-rate signal for high altitude platform station(HAPS) in the stratosphere, it is necessary to design digital system to acquire and track the carrier. In the high dynamic and high information-rate situation, the most important aspect is the great influence of Doppler frequency shift and high information rate on the carrier acquisition and track. Carrier acquisition and track in the high dynamic and high information-rate situation was implemented by means of the combination of FPGA and frequency, phase lock loop. A new algorithm using DQPSK for carrier acquisition and track was proposed and the validity of the design and algorithm was proved by means of trials and comparison with EKF method in the high dynamic and high information-rate situation

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