Abstract: The present disclosure provides a method for improving performance of a MOS device, including: providing a work function layer; forming a barrier layer on the work function layer; forming a metal layer on the barrier layer, wherein the material of the metal layer is tungsten, and the thickness of the metal layer is 3000 ?; and etching the metal layer, the barrier layer, and the work function layer to form a gate structure. The present disclosure replaces an Al gate material in the conventional 22 nm process with tungsten, and replaces a Ti adhesive layer and a TiN barrier layer below an Al gate with a TiN barrier layer of 25 ?. The present disclosure greatly reduces a gate resistance of the MOS device and enhances a tensile stress of a channel, thereby improving the performance of the NMOS device.

Abstract: Described are a water quality testing method and a water quality testing apparatus. The testing method includes: obtaining, in a first environment, a testing sample including a target testing object; selecting a reference object according to the testing sample, and respectively acquiring the chroma of the reference object in a second environment and in the first environment; constructing a correction model according to the chroma of the reference object in the second environment and in the first environment; obtaining the chroma of the testing sample in the first environment; according to the chroma of the testing sample in the first environment and the correction model, obtaining the chroma of the testing sample in the second environment; and according to a preset standard curve and the chroma of the testing sample in the second environment, obtaining the concentration of the target testing object in the testing sample.

Abstract: A method of preparing epoxypropane by direct epoxidation of propylene includes the steps of contacting a mixed gas consisting of a reaction feed gas and a diluent gas with a catalyst to carry out reaction under reaction conditions of propylene epoxidation to prepare epoxypropane. The reaction feed gas contains propylene, oxygen gas and hydrogen gas while at least a portion of the diluent gas is a gaseous olefin. Using gaseous olefin as at least a portion of the diluent gas to perform propylene epoxidation that can significantly extend service life of the catalyst, effectively reduce the used amount of diluent gas, and improve the reaction selectivity and propylene conversion rate.