Abstract: Disclosed is a composition for inhibiting nitrate decomposition and its preparation method, which belongs to a field of photocatalytic technology, comprising: weighing titanium dioxide and pure phase metal carbonate or pure phase metal bicarbonate proportionally; adding the weighed pure phase metal carbonate or the pure phase metal bicarbonate to titanium dioxide for grinding to obtain a metal carbonate/bicarbonate-containing mixture. The method of inhibiting nitrate decomposition using the metal carbonate/bicarbonate of the present disclosure has a significant ability to inhibit nitrate decomposition, and the experimental results show that the method of inhibiting nitrate decomposition using the metal carbonate/bicarbonate can effectively inhibit the decomposition of the nitrate under irradiation for a long time.

Abstract: One or more implementations of the present specification provide an invoice access method and apparatus based on a blockchain, and an electronic device. The method includes: generating first ciphertext data by encrypting plaintext data of the target invoice based on a first key corresponding to an invoice issuer; generating second ciphertext data by encrypting the plaintext data of the target invoice based on a second key corresponding to an invoice receiver; adding the first ciphertext data and an user identifier of the invoice issuer to the blockchain as related to one another; and adding the second ciphertext data and an user identifier of the invoice receiver to the blockchain as related to one another.

Abstract: Embodiments of the present disclosure provide a method and system for positioning a robot and adjusting a posture. The method may include obtaining a first image and a second image of a target object. The first image may be captured using an image capturing apparatus, and the second image may be captured using a medical imaging device. The method may also include determining at least one target region corresponding to at least one target portion of the target object from the first image. The at least one target portion may be less affected by physiological motions than other portions. The method may further include determining positioning information of the robot based on the at least one target region and the second image.

Abstract: A hybrid-mode charging circuit, and a charging method are provided. The hybrid-mode charging circuit includes a hybrid-mode charging control circuit, configured to determine whether an adapter supports continuous voltage regulation, where when the adapter does not support continuous voltage regulation, a transistor M5 and a transistor M6 are controlled to be turned off and a transistor M1, a transistor M2, a transistor M3, and a transistor M4 are controlled to work in a buck charging mode or a three-level buck mode; and when the adapter supports continuous voltage regulation, the adapter is controlled to output two times of battery voltage, the transistor M5 and the transistor M6 are controlled to be always in an on state, and the transistor M1, the transistor M2, the transistor M3, and the transistor M4 are controlled to be turned on or off alternately.

Abstract: The disclosure relates to an expression method of a Haemocoagulase Acutus (Halase) recombinant protein. The method includes the following steps: (1) optimizing a halase gene; (2) performing Polymerase Chain Reaction (PCR) amplification on an optimized halase gene; (3) constructing an Agkis-pMCX expression vector, transforming plasmids to competent cells of an Escherichia coli for amplification, screening in an Amp-resistant manner for positive cloning, sequencing and extracting recombinant plasmids with correct sequencing; (4) transfecting recombinant plasmids to CHO cells; and (5) expressing the recombinant protein and identifying. According to the expression method, a recombinant halase is expressed first using the CHO cells cultured in a serum-free suspension manner; and by utilizing a bioengineering means, the actual production problems of insufficient raw material sources and unstable quality of a snake venom product are solved successfully.

Abstract: An epitaxial growth process for a semiconductor device includes providing a semiconductor substrate, forming a plurality of Dummy Gate structures on the surface of the semiconductor substrate, and forming grooves in a self-aligned manner on both sides of the Dummy Gate structures; forming an initial seed layer on the inner side surfaces of the grooves, the thickness of the formed initial seed layer on the bottoms of the grooves being greater and the thickness of the formed initial seed layer on the sidewalls being smaller since the growth speed of crystal faces <100> and <110> is different; longitudinally etching the initial seed layer to thin the bottom of the initial seed layer to form a seed layer; forming a main body layer on the seed layer, the main body layer filling the grooves; and forming a cover layer on the main body layer.

Abstract: An epitaxial growth process for a semiconductor device includes providing a semiconductor substrate, forming a plurality of Dummy Gate structures on the surface of the semiconductor substrate, and forming grooves in a self-aligned manner on both sides of the Dummy Gate structures; forming an initial seed layer on the inner side surfaces of the grooves, the thickness of the formed initial seed layer on the bottoms of the grooves being greater and the thickness of the formed initial seed layer on the sidewalls being smaller since the growth speed of crystal faces <100> and <110> is different; longitudinally etching the initial seed layer to thin the bottom of the initial seed layer to form a seed layer; forming a main body layer on the seed layer, the main body layer filling the grooves; and forming a cover layer on the main body layer.

Abstract: The disclosure relates to an expression method of a Haemocoagulase Acutus (Halase) recombinant protein. The method includes the following steps: (1) optimizing a halase gene; (2) performing Polymerase Chain Reaction (PCR) amplification on an optimized halase gene; (3) constructing an Agkis-pMCX expression vector, transforming plasmids to competent cells of an escherichia coli for amplification, screening in an Amp-resistant manner for positive cloning, sequencing and extracting recombinant plasmids with correct sequencing; (4) transfecting recombinant plasmids to CHO cells; and (5) expressing the recombinant protein and identifying. According to the expression method, a recombinant halase is expressed first using the CHO cells cultured in a serum-free suspension manner; and by utilizing a bioengineering means, the actual production problems of insufficient raw material sources and unstable quality of a snake venom product are solved successfully.

Abstract: Halogen-free, thermoplastic polyurethane-based compositions having good mechanical and flame-retardant properties are provided. The compositions include flame-retardant aromatic organic phosphate compounds that do not exhibit migration in molded products, such as cable and wire jacketing and insulation. The compositions include a continuous resin phase comprising a thermoplastic polyurethane elastomer, at least one aromatic organic phosphate flame retardant having a melting point of at least 50.

Abstract: Halogen-free, thermoplastic polyurethane-based compositions having good mechanical and flame-retardant properties are provided. The compositions include flame-retardant aromatic organic phosphate compounds that do not exhibit migration in molded products, such as cable and wire jacketing and insulation.

Abstract: In one embodiment, a composition (10) to be mixed with a molten metal to make a metal matrix composite, the composition characterized by: a ceramic reinforcing filler (12), the ceramic reinforcing filler not being wettable by molten aluminum and/or not being chemically stable in molten aluminum, the ceramic reinforcing filler being coated with a ceramic material, the ceramic material being wettable by and chemically stable in molten aluminum. In a related embodiment, a composition (20) to make a porous preform to be infiltrated by molten metal to make a metal matrix composite, the composition characterized by: a ceramic reinforcing filler (23), the ceramic reinforcing filler not being wettable by molten aluminum, the ceramic reinforcing filler being coated with a ceramic material (22) and optionally with a metal (21) such as nickel, the ceramic material being wettable by molten aluminum.

Abstract: In one embodiment, a composition (10) to be mixed with a molten metal to make a metal matrix composite, the composition characterized by: a ceramic reinforcing filler (12), the ceramic reinforcing filler not being wettable by molten aluminum and/or not being chemically stable in molten aluminum, the ceramic reinforcing filler being coated with a ceramic material, the ceramic material being wettable by and chemically stable in molten aluminum. In a related embodiment, a composition (20) to make a porous preform to be infiltrated by molten metal to make a metal matrix composite, the composition characterized by: a ceramic reinforcing filler (23), the ceramic reinforcing filler not being wettable by molten aluminum, the ceramic reinforcing filler being coated with a ceramic material (22) and optionally with a metal (21) such as nickel, the ceramic material being wettable by molten aluminum.

Abstract: A method for the preparation of hydrophilic silica gels with high pore volume. In the preferred method a hydrophilic silica hydrogel treated with an organosilicon compound to effect hydrophobing of the silica hydrogel is heated in the presence of an oxidizing atmosphere to a temperature sufficient to reduce the hydrophobicity imparted by the surface treatment thereby producing a hydrophilic silica gel having high pore volume.

Abstract: A room temperature vulcanizing (RTV) silicone composition curable in the presence of moisture with rapid development of green strength. The RTV silicone composition comprises (A) 0 to about 85 weight percent polydiorganosiloxanes comprising on average at least 1.2 chain terminations per molecule selected from the group consisting of hydroxysilyl groups and alkoxysilyl groups; (B) about 10 to 95 weight percent polydiorganosiloxanes comprising on average at least 1.

Abstract: A method for the preparation of hydrophobic precipitated silica. The method comprises contacting an aqueous suspension of a hydrophilic precipitated silica with (1) a catalytic amount of an acid and (2) an organosilicon compound in the presence of (3) a water-miscible organic solvent in an amount sufficient to facilitate reaction of the hydrophilic precipitated silica with the organosilicon compound to form a hydrophobic precipitated silica.

Abstract: The present invention is neutral-aged hydrophobic silica gels having a reduced surface area and a method for their preparation. The method comprises three steps, where in the first step a mixture comprising a silica hydrosol and colloidal silica is contacted with a strong mineral acid at a pH less than about 1 to form a silica hydrogel having incorporated therein colloidal silica. In the second step the silica hydrogel is aged at a pH within a range of about pH 3.5 to pH 8. In the third step the silica hydrogel is contacted with an organosilicon compound in the presence of a catalytic amount of a strong acid to effect hydrophobing of the silica hydrogel to form a hydrophobic silica hydrogel having a surface area within a range of about 100 m.sup.2 /g to 450 m.sup.2 /g in the dry state. In a preferred method the hydrophobic silica hydrogel and is further contacted with a sufficient quantity of a water-immiscible organic solvent to convert the hydrophobic silica hydrogel into a hydrophobic silica organogel.

Abstract: A method for removing metal contaminates from solution using mercapto-functional silica xerogels. The mercapto-functional silica xerogels are characterized by having a surface area greater than 365 m.sup.2 /g, an average pore diameter of at least 6 nm, and a pore volume of at least 2 cm.sup.3 /g. The mercapto-functional silica xerogels are particularly useful for removing Group VIII metals such as platinum from solutions comprising polyorganosiloxane fluids and resins.

Abstract: The present invention is hydrophobic silica gels having a reduced surface area and a method for their preparation under neutral conditions. The method comprises two steps, where in the first step the pH of a mixture comprising a silica hydrosol and colloidal silica is adjusted with a base to within a range of pH 3 to pH 6 to facilitate formation of a silica hydrogel having incorporated therein colloidal silica. In the second step the silica hydrogel is contacted with an organosilicon compound in the presence of a catalytic amount of a strong acid to effect hydrophobing of the silica hydrogel to form a hydrophobic silica gel having a surface area within a range of about 100 m.sup.2 /g to 450 m.sup.2 /g in the dry state. In a preferred process the hydrophobic silica gel is contacted with a sufficient quantity of a water-immiscible organic solvent to convert the hydrophobic silica hydrogel into a hydrophobic silica organogel.

Abstract: The present invention is neutral-aged hydrophobic organosilicate-modified silica gels and a method for their preparation. The method comprises three steps, where in the first step an organosilicate-modified silica hydrosol is contacted with a strong mineral acid at a pH less than about 1 to form an organosilicate-modified silica hydrogel. In the second step the organosilicate-modified silica hydrogel is aged at a pH within a range of about pH 3.5 to pH 8. In the third step the neutral-aged organosilicate-modified silica hydrogel is contacted with an organosilicon compound in the presence of a catalytic amount of a strong acid to effect hydrophobing of the organosilicate-modified silica hydrogel to form a hydrophobic organosilicate-modified silica hydrogel having a surface area within a range of about 100 m.sup.2 /g to 750 m.sup.2 /g in the dry state.

Abstract: The present invention is hydrophobic organosilicate-modified silica gels and a method for their preparation under neutral conditions. The method comprises two steps, where in the first step the pH of an organosilicate-modified silica hydrosol is adjusted with a base to within a range of about pH 3 to pH 7 to facilitate formation of an organosilicate-modified silica hydrogel. In the second step the organosilicate-modified silica hydrogel is contacted with an organosilicon compound in the presence of a catalytic amount of a strong acid to effect hydrophobing of the organosilicate-modified silica hydrogel to form a hydrophobic organosilicate-modified silica gel having a surface area within a range of about 100 m.sup.2 /g to 850 m.sup.2 /g in the dry state.