Abstract: The present invention relates to the technical field of the fluorine chemical industry, and disclosed are a preparation method for a perfluoroolefin oligomer and an application thereof. The preparation method comprises: selecting a combination of two or more raw material monomers selected from among the following (i) and (ii) undergoing an oligomerization reaction under the catalysis of a metal fluoride salt to obtain a perfluoroolefin oligomer product the total carbon number of which is not less than 7, wherein (i) is tetrafluoroethylene, a tetrafluoroethylene oligomer or a mixture thereof, and (ii) is hexafluoropropylene, a hexafluoropropylene oligomer or a mixture thereof. The present application solves the difficult problem of high-selectivity preparation of perfluoroolefin oligomers having high carbon numbers.

Abstract: A multifunctional immunity-targeted micromolecule anti-cancer medicine Citrate Bestazomib and preparation method and application thereof. The structure of the multifunctional immunity-targeted micromolecule anti-cancer medicine Bestazomib Citrate is shown as follows: The multifunctional immunity-targeted micromolecule anti-cancer medicine Citrate Bestazomib has an activity-inhibiting effect on APN/CD13, also has an activity-inhibiting effect on tumor proteasome, and can be applied to the development of medicines for treating malignant tumors.

Abstract: The present disclosure provides a method for sweat volume detection based on sweat print imaging, comprising: obtaining a raw data set, the raw data set including at least one sweat print image formed by dropping different volumes of sweat on a test paper under different environmental parameters; obtaining a color value extreme of the sweat print image and dividing the sweat print image into at least one region; calculating a sweat error based on a total sweat collection volume and a real sweat volume; obtaining a trained error prediction model; obtaining a to-be-tested sweat print image and current environmental parameters; inputting the current environmental parameters and a count of regions of the to-be tested sweat print image into the trained error prediction model to determine a sweat error of the to-be-tested sweat print image; calculating a sweat volume and a sweat rate based on the sweat error.

Abstract: The present disclosure provides a method for sweat volume detection based on sweat print imaging, comprising: obtaining a raw data set, the raw data set including at least one sweat print image formed by dropping different volumes of sweat on a test paper under different environmental parameters; obtaining a color value extreme of the sweat print image and dividing the sweat print image into at least one region; calculating a sweat error based on a total sweat collection volume and a real sweat volume; obtaining a trained error prediction model; obtaining a to-be-tested sweat print image and current environmental parameters; inputting the current environmental parameters and a count of regions of the to-be tested sweat print image into the trained error prediction model to determine a sweat error of the to-be-tested sweat print image; calculating a sweat volume and a sweat rate based on the sweat error.

Abstract: A pig production method by using a detachable and washable wet curtain for intensive pig farming The detachable and washable wet curtain includes a wet curtain mounting frame (1), a spray tube (4), a plurality of rotatable reels (7) equivalent to sleeves, a reel (6) with a buckle, a wet curtain net (8), a reel (10) with a buckle, and a manual handle (9). The wet curtain is formed by a low-cost common material, namely a plastic net and the like, is convenient to mount, detach, and wash, and is not prone to making dust, scale, algae, mosquitos, and the like accumulate thereon, thus reducing the replacement cost and use cost. Therefore, a new cooling method based on the wet curtain is provided for pig farms in summer, and it is also suitable for other livestock farms in summer.

Abstract: The invention discloses a dry ice crushing mechanism, and relates to the technical field of a dry ice cleaning equipment. The dry ice crushing mechanism comprises a base, a filter screen mechanism, an ice crushing mechanism, a driving mechanism and a transmission mechanism, the filter screen mechanism is arranged in the base, the ice crushing mechanism is arranged in the filter screen mechanism, the driving mechanism is arranged on one side of the base, and the driving mechanism is connected with the filter screen mechanism through the transmission mechanism and is used for driving the ice crushing mechanism to rotate or swing in the filter screen mechanism. According to the dry ice crushing mechanism, ice is crushed in a rotating or swinging mode of the ice crushing mechanism, the dry ice particle refining efficiency can be obviously improved without changing the environment of an existing equipment.

Abstract: A railway vehicle control method includes: receiving information of a target railway vehicle in front of a current railway vehicle and a current speed of the current railway vehicle; controlling, based on the information of the target railway vehicle and the current speed, the current railway vehicle to operate, and determining an operation requirement for the target railway vehicle; and transmitting the operation requirement for the target railway vehicle to a central server.

Abstract: A multifunctional immunity-targeted micromolecule anti-cancer medicine Citrate Bestazomib and preparation method and application thereof. The structure of the multifunctional immunity-targeted micromolecule anti-cancer medicine Bestazomib Citrate is shown as follows: The multifunctional immunity-targeted micromolecule anti-cancer medicine Citrate Bestazomib has an activity-inhibiting effect on APN/CD13, also has an activity-inhibiting effect on tumor proteasome, and can be applied to the development of medicines for treating malignant tumors.

Abstract: A pig production method by using a detachable and washable wet curtain for intensive pig farming. The detachable and washable wet curtain includes a wet curtain mounting frame (1), a spray tube (4), a plurality of rotatable reels (7) equivalent to sleeves, a reel (6) with a buckle, a wet curtain net (8), a reel (10) with a buckle, and a manual handle (9). The wet curtain is formed by a low-cost common material, namely a plastic net and the like, is convenient to mount, detach, and wash, and is not prone to making dust, scale, algae, mosquitos, and the like accumulate thereon, thus reducing the replacement cost and use cost. Therefore, a new cooling method based on the wet curtain is provided for pig farms in summer, and it is also suitable for other livestock farms in summer.

Abstract: The present invention discloses a method for preparing 2,3,3,3-tetrafluoropropene using methylmagnesium chloride, comprising the following steps: 1) preparing 1,1,2-trifluoropropene (CH3CF?CF2); 2) preparing 1,1,1,2,2-pentafluoropane (CF3CF2CH3); 3) preparing 2,3,3,3-tetrafluoropropene (CF3CF?CH2). In the present invention, using a Grignard reagent, namely methylmagnesium chloride, and tetrafluoroethylene as starting raw materials, 2,3,3,3-tetrafluoropropene is prepared by three steps of nucleophilic addition-elimination, fluorine addition, and dehydrofluorination in sequence. The process flow is relatively short, and the product yield is high.

Abstract: The present invention discloses a method for preparing 2,3,3,3-tetrafluoropropene using methylmagnesium chloride, comprising the following steps: 1) preparing 1,1,2-trifluoropropene (CH3CF?CF2); 2) preparing 1,1,1,2,2-pentafluoropane (CF3CF2CH3); 3) preparing 2,3,3,3-tetrafluoropropene (CF3CF?CH2). In the present invention, using a Grignard reagent, namely methylmagnesium chloride, and tetrafluoroethylene as starting raw materials, 2,3,3,3-tetrafluoropropene is prepared by three steps of nucleophilic addition-elimination, fluorine addition, and dehydrofluorination in sequence. The process flow is relatively short, and the product yield is high.

Abstract: The present invention relates to a method for preparing pancreatic islet cells, and preferably pancreatic beta cells starting from progenitor cells obtained from the pancreas of an adult mammal. The invention also provides a method for isolating progenitor cells, and preferably beta cell progenitors, from the pancreas of an adult mammal. Other aspects of the invention comprise the pancreatic islet (beta) cells and the progenitor cells that can be obtained with the present invention and their use, e.g. in diagnostic, therapeutic or research applications.