Abstract: Disclosed is a method for preparing a carbonized silk photocatalyst, comprising: soaking a natural silk and an activator in water, taking out the soaked silk, and drying the same; and roasting the dried silk under the protection of an inert atmosphere to prepare a carbonized silk photocatalyst. Also disclosed is a method for photocatalytic desulfurization of a fuel oil, comprising: mixing a fuel oil to be desulfurated, an extraction agent and a carbonized silk photocatalyst, with air being used as an oxidizing agent, to conduct a photocatalytic reaction under light irradiation, and separating an upper oil phase to obtain a desulfurated fuel oil. The catalyst has a simple preparation process, and can effectively reduce dibenzothiophene sulfides, which are difficult to remove, in the fuel oil under UV light radiation. Desulfurization can be achieved at room temperature, and reaction conditions are mild.

Abstract: Disclosed is a method for preparing a carbonized silk photocatalyst, comprising; soaking a natural silk and an activator in water, taking out the soaked silk, and drying the same; and roasting the dried silk under the protection of an inert atmosphere to prepare a carbonized silk photocatalyst. Also disclosed is a method for photocatalytic desulfurization of a fuel oil, comprising: mixing a fuel oil to be desulfurated, an extraction agent and a carbonized silk photocatalyst, with air being used as an oxidizing agent, to conduct a photocatalytic reaction under light irradiation, and separating an upper oil phase to obtain a desulfurated fuel oil. The catalyst has a simple preparation process, and can effectively reduce dibenzothiophene sulfides, which are difficult to remove, in the fuel oil under UV light radiation. Desulfurization can be achieved at room temperature, and reaction conditions are mild.

Abstract: A method and system for auctioning an auction item in a multi-attribute auction. A winning bid is selected by determining a secret value function indicative of acceptable combination of attribute values for the auction owner. The auction owner computing device or the auction server generates alternate combinations of attribute values based at least in part on the secret value function. To generate the alternate combinations of attribute values at least some of the combinations of attribute values are perturbed so as to hinder the bidders from deriving or finding the secret value function. The auction server informs the bidders, via a bidder interface of a client computing device, about the alternate combinations of attribute values and required biding directions. The bidder can offer a bid in a next round based on the alternate combinations of attribute values, in a progressive manner and without knowledge of the secret value function.

Abstract: A method and system for auctioning an auction item in a multi-attribute auction. A winning bid is selected by determining a secret value function indicative of acceptable combination of attribute values for the auction owner. The auction owner computing device or the auction server generates alternate combinations of attribute values based at least in part on the secret value function. To generate the alternate combinations of attribute values at least some of the combinations of attribute values are perturbed so as to hinder the bidders from deriving or finding the secret value function. The auction server informs the bidders, via a bidder interface of a client computing device, about the alternate combinations of attribute values and required biding directions. The bidder can offer a bid in a next round based on the alternate combinations of attribute values, in a progressive manner and without knowledge of the secret value function.