Single-Photon Frequency Conversion for Quantum Interface

Single-photon frequency conversion for quantum interface plays an important role in quantum communications and networks, which is crucial for the realization of quantum memory, faithful entanglement swapping and quantum teleportation. In this chapter, we will present our recent experiments about single-photon frequency conversion based on quadratic nonlinear processes. Firstly, we demonstrated spectrum compression of broadband single photons at the telecom wavelength to the near-visible window, marking a critical step towards coherent photonic interface. Secondly, we demonstrated the nonlinear interaction between two chirped broadband single-photon-level coherent states, which may be utilized to achieve heralding entanglement at a distance. Finally, we theoretically introduced and experimentally demonstrated single-photon frequency conversion in the telecom band, enabling switching of single photons between dense wavelength-division multiplexing channels. Moreover, quantum entanglement between the photon pair is maintained after the frequency conversion. Our researches have realized three significant quantum interfaces via single-photon frequency conversion, which hold great promise for the development of quantum communications and networks

Carbon information disclosure of enterprises and their value creation through market liquidity and cost of equity capital

Purpose: Drawing on asymmetric information and stakeholder theories, this paper investigates two mechanisms, namely market liquidity and cost of equity capital, by which the carbon information disclosure of enterprises can benefit their value creation. Design/methodology/approach: In this research, web crawler technology is employed to study the link between carbon information disclosure and enterprises value creation，and the carbon information data are provided by all companies listed in Chinese A-share market Findings: The results show that carbon information disclosure have significant positive influence on enterprise value creation, which is embodied in the relationship between carbon information disclosure quantity, depth and enterprise value creation, and market liquidity and cost of equity capital play partially mediating role in it, while the influence of carbon information disclosure quality and concentration on enterprise value creation are not significant in statistics. Research limitations/implications: This paper explains the influence path and mechanism between carbon information disclosure and enterprise value creation deeply, answers the question of whether carbon information disclosure affects enterprise value creation or not in China.Practical implications: This paper finds that carbon information disclosure contributes positively to enterprise value creation suggests that managers can reap more financial benefits by disclosing more carbon information and investing carbon emissions management. So, managers in the enterprises should strengthen the management of carbon information disclosure behavior. Originality/value: The paper gives a different perspective on the influence of carbon information disclosure on enterprise value creation, and suggests a new direction to understand carbon information disclosure behavior.Peer Reviewe

Carbon information disclosure of enterprises and their value creation through market liquidity and cost of equity capital

Purpose: Drawing on asymmetric information and stakeholder theories, this paper investigates two mechanisms, namely market liquidity and cost of equity capital, by which the carbon information disclosure of enterprises can benefit their value creation. Design/methodology/approach: In this research, web crawler technology is employed to study the link between carbon information disclosure and enterprises value creation，and the carbon information data are provided by all companies listed in Chinese A-share market Findings: The results show that carbon information disclosure have significant positive influence on enterprise value creation, which is embodied in the relationship between carbon information disclosure quantity, depth and enterprise value creation, and market liquidity and cost of equity capital play partially mediating role in it, while the influence of carbon information disclosure quality and concentration on enterprise value creation are not significant in statistics. Research limitations/implications: This paper explains the influence path and mechanism between carbon information disclosure and enterprise value creation deeply, answers the question of whether carbon information disclosure affects enterprise value creation or not in China.Practical implications: This paper finds that carbon information disclosure contributes positively to enterprise value creation suggests that managers can reap more financial benefits by disclosing more carbon information and investing carbon emissions management. So, managers in the enterprises should strengthen the management of carbon information disclosure behavior. Originality/value: The paper gives a different perspective on the influence of carbon information disclosure on enterprise value creation, and suggests a new direction to understand carbon information disclosure behavior.Peer Reviewe

Signification et Interprétation : l’adjonction de « même »

L’adverbe même a un rôle grammatical et lexical : grammatical, il fonctionne dans la construction syntactique à titre de mot-outil ; lexical, il contribue à la constitution sémantique du discours. Un grand nombre d’analyses montrent déjà quel’adverbe même peut porter, au moins dans certaines situations d’énonciation, sur chaque segment d’un énoncé, plus précisément, qualifier le sujet, le verbe, le complément, l’attribut, le circonstanciel, jusqu’à toute la phrase. Cela signifie que, du point..

Fuzzy-Bayesian-network-based Safety Risk Analysis in Railway Passenger Transport

This study presents a fuzzy Bayesian network (FBN) method to analyze the influence on the safety risk of railway passenger transport applying different risk control strategies. Based on the fuzzy probability of the basic event determined by the expert group decision method, the proposed FBN method can reasonably predict the probability of railway passenger safety risk. It is also proven that control the risk in the safety management of railway passenger transport will be the most effective way to reduce the risk probability of the railway passenger transport safety