Abstract: A method for identifying transformation products of antibiotics from known and potential unknown transformation pathways includes: step 1: collecting samples, extracting antibiotics and transformation products thereof, and obtaining non-target data by ultra-high performance liquid chromatography-high resolution mass spectrometry; step 2: identifying transformation products of antibiotics from known and unknown transformation pathways; step 3: generating a list of candidate transformation products and annotating their structures; step 4: extracting feature fragments based on structure annotations of the transformation products obtained in step 3, and searching for spectra with the feature fragment, and supplementing the transformation products from unknown transformation pathway; and step 5: obtaining a final list of identified products based on annotated structures.

Abstract: A supported transition metal carbide catalyst and a one-step synthesis method thereof are disclosed. The synthesis method includes: mixing a supporter, a transition metal precursor and a solid carbon source and then grinding to form a solid mixture; and putting the solid mixture into a reducing atmosphere, performing carbonization treatment and high-temperature programming thermal treatment in turn, and then at a protective atmosphere, cooling and passivating, so as to obtain the supported transition metal carbide catalyst. The synthesis method provided by the present application utilizes high-temperature solid solution reaction for further synthesis, which at least has the following advantages: the preparation process flow is simple so processes such as impregnation and carburization with gas carbon source can be avoided; different supporters used for catalyst modification, and the prepared catalyst has the characteristics of large outer surface area, rich notable metal-like catalytic property and the like.

Abstract: A breast pump and method of manufacturing the breast pump are described. The breast pump includes a pair of pads configured to be applied to human breasts of a user, each of the pads containing sensors and actuators, a pressure generator configured to provide vacuum within a first predetermined range and compression within a second predetermined range to operate the actuators in each pad, a temperature control system, and an artificial intelligence (AI) control system configured to control, based on feedback from the sensors, the pressure generator to mimic intra-oral motion of an infant and the temperature control system.

Abstract: A supported transition metal carbide catalyst and a one-step synthesis method thereof are disclosed. The synthesis method includes: mixing a supporter, a transition metal precursor and a solid carbon source and then grinding to form a solid mixture; and putting the solid mixture into a reducing atmosphere, performing carbonization treatment and high-temperature programming thermal treatment in turn, and then at a protective atmosphere, cooling and passivating, so as to obtain the supported transition metal carbide catalyst. The synthesis method provided by the present application utilizes high-temperature solid solution reaction for further synthesis, which at least has the following advantages: the preparation process flow is simple so processes such as impregnation and carburization with gas carbon source can be avoided; different supporters used for catalyst modification, and the prepared catalyst has the characteristics of large outer surface area, rich notable metal-like catalytic property and the like.

Abstract: An alkylation catalyst comprises from 50 to 70 wt % of hydrogen type ZSM-SM-11 co-crystaline zeolite containing rare earth element and the rest amount of porous inorganic oxide matrix material. The zeolite has particular chemical composition and X-ray diffraction lines. This catalyst has higher activity, selectivity and stability in alkylation process than that of the prior art. With this catalyst the process for preparing ethyl benzene by alkylation of benzene with ethylene has higher ethylene conversion and ethyl benzene selectivity.

Abstract: A rare earth-containing zeolite with a cocrystalline structure of ZSM-5 and ZSM-11, wherein the weight ratio of the moiety having the crystalline structure of ZSM-5 to the moiety having the crystalline structure of ZSM-11 is 0.1 to 10, which has, in the sodium form, the X-ray diffraction pattern set forth in Table 1, and in its originally synthesized anhydrous state, a chemical formula in terms of mole ratios of oxides as follows: 0.1-1.0 Na.sub.2 O.0.01-1.0 RE.sub.2 O.sub.3.Al.sub.2 O.sub.3.20-300 SiO.sub.2. Said zeolite has good acid hydrothermal stability and resistance against impurity contamination, and is useful as catalyst in various hydrocarbon conversions.