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1

Concession crossover in electronic negotiations

100%

Carbonneau R. , Vahidov R. , Yu B.

Control and Cybernetics

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2021

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tom Vol. 50, No. 1

51--67

EN

Negotiation is a joint decision making process involving making concessions by the parties. Concession-making may involve giving up negotiator’s utility and is an essential activity in the negotiation process. In the past it has been suggested by some authors that negotiators utility functions over the issues may not be linear. In this case, a phenomenon called “concession crossover” takes place, in which a negotiator may switch issues on which they choose to make concessions at some point in negotiations. This work sets to investigate the validity of such claims. To this end we introduce several concession-making models and use them for testing hypotheses. We have used a dataset from online negotiation experiments featuring a contract-signing case. The results support the claim that concession crossover does indeed occur.

2

Bibliometric and visual analysis of heavy metal health risk assessment: development, hotspots and trends

88%

Zhang Y. , Lu X. , Deng S. , Zhu T. , Yu B.

Archives of Environmental Protection

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2024

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tom Vol. 50, no 1

56--71

EN

Due to the widespread presence and harmfulness of heavy metals in the environment, scholars around the world have evaluated the exposure characteristics and health risks of heavy metals. To understand the status, hotspots, and development treads of heavy metal health risk assessment research, we used bibliometric analysis tools to conduct scientometric analysis of the literature related to the health risk assessment of heavy metals in the Web of Science database from 2000 to 2022. The analysis results indicate that research related to heavy metal health risk assessment is rapidly developing in both developed and developing countries. China’s significant international influence in this field is worth noting, as there are many publications and highly cited documents related to China. France and other developed countries also play an important role in this field due to their high centrality and strong bursts. The results of co-citation cluster analysis and keyword co-occurrence analysis indicate that in the past two decades, the primary research domains and hotspots of heavy metal health risk assessment have been the study of heavy metals in soil, dust, drinking water, vegetables, fish, and sediment. There is a specific focus on bioaccumulation, bioavailability, source apportionment, and spatial distribution of heavy metals. The main types of heavy metals studied are lead, cadmium, mercury, and zinc. The results of the bursts keywords analysis suggest that future research trends may focus more on the health risks of heavy metals in different functional areas of cities.

3

Strengthening the rough selection effect of n-ethyl o-isopropyl thionocarbamate (Dow: Z-200) on chalcopyrite by ultrasonic pretreatment

88%

Wang Y. , Wang Y. , Yu B. , Wang X. , Ma X.

Physicochemical Problems of Mineral Processing

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2021

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tom Vol. 57, iss. 1

64--74

EN

In this study, the properties of (CH3)2CHOC(S)NHC2H5(Dow: Z-200) after the ultrasonic pretreatment was characterized by employing surface tension, viscosity, and Fourier transform infrared (FTIR) spectroscopy, and its influence on chalcopyrite rough selecting was investigated. The results indicate that the pretreated Z-200 can improve the index of chalcopyrite roughing. And, under the same reagent system, the recovery of copper reached 82.84% which was an increase of 24.44% compared with the untreated when Z-200 after ultrasonic pretreatment was applied to the rough separation of chalcopyrite. The reason why ultrasonic can strengthen the flotation effect of Z-200 on chalcopyrite is that ultrasonic pretreatment can decrease the surface tension and viscosity of Z-200 and enhance its foaming performance. Meanwhile, the ultrasonic cavitation destroys the molecular structure of Z-200, so that the relative proportion of methyl absorption peak and amine absorption peak in Z-200 increases. This also further improves the collection performance and foaming performance of Z-200 and strengthens its separation effect on chalcopyrite. The research provides a new idea for Z-200 to act on chalcopyrite and improve its flotation efficiency, reduce the amount of flotation reagent, and its pollution to the environment. It also provides a theoretical basis for expanding the application of ultrasonic technology in the field of flotation.