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Attribute-based group signatures (ABGS) allow a signer to anonymously prove her membership in a group and her ownership of certain attributes, thus can find many applications where both privacy and authentication are required. In this paper, we present a new construction of ABGS based on Fuchsbauer’s automorphic signatures and the Groth and Sahai’s non-interactive witness-indistinguishable proof system. Compared with other ABGS in the literature, our construction is proved secure against fully adaptive adversaries in the standard model, instead of against selected adversaries in the random oracle model. In addition, it admits any signing policies if they can be described as monotone Boolean formulas, and the size of a signature is independent of the number of signers in the group.

A curved glass evacuated solar collector tube welding and metal melting point, to achieve the stability of vacuum time. Application of the solar collector tube, the heat collector device, solar radiation intensity in 17MJ/M2 cases, after 30 minutes of sunshine arc temperature of solar vacuum tube load up to 480 ℃ or above, add heat transfer medium after the medium output temperatures up to 220 ℃. Solar vacuum tube with curved endothermic components help focus line fluctuations, solar energy in order to achieve high-temperature heating, the high temperature heat output.

Using CFD to simulate the flow field of impinging jet mixer in polyurea spraying gun,discussing the process of the spraying and jointing of the mixer after studying the profile of velocity and pressure.Spraying and jointing are available for the nozzle by changing the inlet pressure, the export velocity is slow under low pressure, so the outburst changes into a stream of flow and the jointing function is realized;while the export velocity is fast when the pressure is high,so the flow spray out to realize the spraying function.The distribution of the pressure and velocity within the mixer is extremely uneven,this is helpful for part A and part B mixing in the mixer.

A general mixed-integer nonlinear programming model (MINLP) is developed in this study for the design of discontinuous water-reuse systems. The proposed model formulation is believed to be more practical than the available models, in the sense that the unrealistic assumptions adopted in previous works have been removed and, also, the wastewater equalization options can be integrated into the system design. The resulting design specifications include the number and sizes of buffer tanks, the physical configuration of pipeline network, and the operating policies of water flows. The network structure of the water-reuse system can also be strategically manipulated by imposing suitable logic constraints. An illustrative example is presented at the end of this paper to demonstrate the effectiveness of our approach.