Abstract: A signal strength measurement method includes: obtaining, by a first access point (AP), a basic service set identifier (BSSID) of a second AP and a first operating channel, where the first operating channel is an operating channel of the second AP, and a station (STA) is associated with the BSSID of the second AP through the operating channel; and sending, by the first AP, a measurement frame to the STA through the operating channel, where a BSSID value of the measurement frame is the BSSID, the measurement frame indicates the STA to send a measurement response frame of which BS SID value is the BSSID, and the measurement response frame carries a signal strength of the measurement frame measured by the STA.

Abstract: An optical module includes a shell, a circuit board, at least one of a light-transmitting chip or a light-receiving chip, a lens assembly and a claw assembly. The lens assembly includes a lens base and a connecting part. The lens base covers the at least one of the light-transmitting chip or the light-receiving chip, and is configured to change a propagation direction of an optical signal incident into the lens assembly. The connecting part includes at least one positioning slot disposed on a surface of the connecting part facing away from the lens base. The claw assembly includes a claw and a through hole. The claw includes at least one positioning protrusion disposed on a surface of the claw facing the connecting part. The through hole is configured to be connected to an optical fiber outside the optical module.

Abstract: An optical module includes a shell, a circuit board, a light-emitting chip, a lens assembly, an optical fiber ferrule assembly and a fastener. The fastener fixes the optical fiber ferrule assembly to the lens assembly. The fastener includes a fastening body, a first clamping portion and a second clamping portion. The first clamping portion is disposed at one end of the fastening body, and is clamped with the optical fiber ferrule assembly. The second clamping portion is disposed at the other end of the fastening body, and is clamped with the lens assembly.

Abstract: A modified Y-type molecular sieve contains 0.5-2 wt. % of Na2O based on the total amount of the modified Y-type molecular sieve. In the modified Y-type molecular sieve, the ratio between the total acid amount measured by pyridine and infrared spectrometry and total acid amount measured by n-butyl pyridine and infrared spectrometry is 1-1.2. The total acid amount measured by pyridine and infrared spectrometry of the modified Y-type molecular sieve is 0.1-1.2 mmol/g. The acid center sites of the molecular sieve of the modified Y-type molecular sieve are distributed in the large pore channels. The molecular sieve is used in the hydrocracking reaction process of a wax oil.

Abstract: A signal strength measurement method includes: obtaining, by a first access point (AP), a basic service set identifier (BSSID) of a second AP and a first operating channel, where the first operating channel is an operating channel of the second AP, and a station (STA) is associated with the BSSID of the second AP through the operating channel; and sending, by the first AP, a measurement frame to the STA through the operating channel, where a BSSID value of the measurement frame is the BSSID, the measurement frame indicates the STA to send a measurement response frame of which BS SID value is the BSSID, and the measurement response frame carries a signal strength of the measurement frame measured by the STA.

Abstract: A modified Y-type molecular sieve contains 0.5-2 wt. % of Na2O based on the total amount of the modified Y-type molecular sieve. In the modified Y-type molecular sieve, the ratio between the total acid amount measured by pyridine and infrared spectrometry and total acid amount measured by n-butyl pyridine and infrared spectrometry is 1-1.2. The total acid amount measured by pyridine and infrared spectrometry of the modified Y-type molecular sieve is 0.1-1.2 mmol/g. The acid center sites of the molecular sieve of the modified Y-type molecular sieve are distributed in the large pore channels. The molecular sieve is used in the hydrocracking reaction process of a wax oil.

Abstract: Provided is a Na—Y molecular sieve and a method for preparing the Na—Y molecular sieve, an H—Y molecular sieve and a method for preparing the H—Y molecular sieve, a hydrocracking catalyst, and a hydrocracking method. The average grain diameter of the Na—Y molecular sieve is 2-5 ?m, and the sum of pore volumes of pores in 1-10 nm diameter accounts for 70-90% of the total pore volume of the Na—Y molecular sieve. The H—Y molecular sieve obtained from the large-grain Na—Y molecular sieve can be used as an acidic component in the hydrocracking catalyst. When the hydrocracking catalyst containing the H—Y molecular sieve is applied in the hydrocracking reaction of heavy oils that contain macromolecules, it can provide better cracking activity and product selectivity in the hydrocracking reaction.

Abstract: The present disclosure provides a hydrocracking catalyst, a method for preparing the same and a use of the same, and a method for hydrocracking catalytic diesel oil. The catalyst comprises a support, an active metal component, and carbon, wherein, based on the total weight of the catalyst, the content of the support is 60 to 90 wt %, the content of the active metal component calculated in metal oxides is 15 to 40 wt %, and the content of carbon calculated in C element is 1 to 5 wt %; measured with an infrared acidimetric estimation method, the acid properties of the hydrocracking catalyst are: the total infrared acid amount is 0.4 to 0.8 mmol/g, wherein, the infrared acid amount of strong acid with desorption temperature greater than 350° C. is 0.08 mmol/g or lower, and the ratio of the total infrared acid amount to the infrared acid amount of strong acid with desorption temperature greater than 350° C. is 5 to 50.

Abstract: Provided is a Na—Y molecular sieve and a method for preparing the Na—Y molecular sieve, an H—Y molecular sieve and a method for preparing the H—Y molecular sieve, a hydrocracking catalyst, and a hydrocracking method. The average grain diameter of the Na—Y molecular sieve is 2-5 ?m, and the sum of pore volumes of pores in 1-10 nm diameter accounts for 70-90% of the total pore volume of the Na—Y molecular sieve. The H—Y molecular sieve obtained from the large-grain Na—Y molecular sieve can be used as an acidic component in the hydrocracking catalyst. When the hydrocracking catalyst containing the H—Y molecular sieve is applied in the hydrocracking reaction of heavy oils that contain macromolecules, it can provide better cracking activity and product selectivity in the hydrocracking reaction.

Abstract: Provided is a Na—Y molecular sieve and a method for preparing the Na—Y molecular sieve, an H—Y molecular sieve and a method for preparing the H—Y molecular sieve, a hydrocracking catalyst, and a hydrocracking method. The average grain diameter of the Na—Y molecular sieve is 2-5 ?m, and the sum of pore volumes of pores in 1-10 nm diameter accounts for 70-90% of the total pore volume of the Na—Y molecular sieve. The H—Y molecular sieve obtained from the large-grain Na—Y molecular sieve can be used as an acidic component in the hydrocracking catalyst. When the hydrocracking catalyst containing the H—Y molecular sieve is applied in the hydrocracking reaction of heavy oils that contain macromolecules, it can provide better cracking activity and product selectivity in the hydrocracking reaction.

Abstract: Disclosed are a beta molecular sieve, a preparation method therefor, and a hydrogenation catalyst containing same. The properties of the beta molecular sieve are as follows: the molar ratio of SiO2/Al2O3 is 30-150, the non-framework aluminum accounts for not more than 2% of the total aluminum, and the silicon atoms coordinated in a Si(OAl) structure account for not less than 95% of the silicon atoms in the framework structure. The preparation method comprises: contacting the raw material powder of the beta molecular sieve with normal pressure and dynamic water vapor, and then with ammonium fluosilicate. The beta molecular sieve of the present invention has the features of a uniform skeleton structure of silicon and aluminum, an appropriate acidity, and a reasonable pore structure, and is suitable as an acidic component of a hydro-upgrading catalyst and a hydro-cracking catalyst for diesel oil.

Abstract: The present invention discloses a modified Y molecular sieve, a preparation method and a use of the modified Y molecular sieve, a supported catalyst, and a hydrocracking method. The silica-alumina mole ratio in the surface layer of the modified Y molecular sieve is 20-100:1, and the silica-alumina mole ratio in the body phase of the modified Y molecular sieve is 8-30:1. When a hydrocracking catalyst prepared from the modified Y molecular sieve is used for hydrocracking, the hydrocracking catalyst has higher reactivity and higher nitrogen tolerance. The hydrocracking catalyst prepared from the modified Y molecular sieve is suitable for use for increasing the yield of diesel oil, increasing the yield of chemical materials, and catalyzed hydrogenation conversion of diesel oil, etc.

Abstract: The present invention relates to a hydrocracking catalyst, a process for preparing the same and use thereof. The present catalyst comprises a cracking component and a hydrogenation component, wherein the cracking component comprises from 0 to 20 wt. % of a molecular sieve and from 20 wt. % to 60 wt. % of an amorphous silica-alumina, the hydrogenation component comprises at least one hydrogenation metal in a total amount of from 34 wt. % to 75 wt. % calculated by the mass of oxides, each amount is based on the total weight of the catalyst. The present catalyst is prepared by directly mixing an acidic component powder material with an impregnating solution, impregnating, filtering, drying, molding, and drying and calcining.

Abstract: The present disclosure provides a hydrocracking catalyst, a method for preparing the same and a use of the same, and a method for hydrocracking catalytic diesel oil. The catalyst comprises a support, an active metal component, and carbon, wherein, based on the total weight of the catalyst, the content of the support is 60 to 90 wt %, the content of the active metal component calculated in metal oxides is 15 to 40 wt %, and the content of carbon calculated in C element is 1 to 5 wt %; measured with an infrared acidimetric estimation method, the acid properties of the hydrocracking catalyst are: the total infrared acid amount is 0.4 to 0.8 mmol/g, wherein, the infrared acid amount of strong acid with desorption temperature greater than 350° C. is 0.08 mmol/g or lower, and the ratio of the total infrared acid amount to the infrared acid amount of strong acid with desorption temperature greater than 350° C. is 5 to 50.

Abstract: The present invention relates to a hydrocracking catalyst, a process for preparing the same and use thereof The present catalyst comprises a cracking component and a hydrogenation component, wherein the cracking component comprises from 0 to 20 wt. % of a molecular sieve and from 20 wt. % to 60 wt. % of an amorphous silica-alumina, the hydrogenation component comprises at least one hydrogenation metal in a total amount of from 34 wt. % to 75 wt. % calculated by the mass of oxides, each amount is based on the total weight of the catalyst. The present catalyst is prepared by directly mixing an acidic component powder material with an impregnating solution, impregnating, filtering, drying, molding, and drying and calcining.

Abstract: Disclosed are a beta molecular sieve, a preparation method therefor, and a hydrogenation catalyst containing same. The properties of the beta molecular sieve are as follows: the molar ratio of SiO2/Al2O3 is 30-150, the non-framework aluminum accounts for not more than 2% of the total aluminum, and the silicon atoms coordinated in a Si(OAl) structure account for not less than 95% of the silicon atoms in the framework structure. The preparation method comprises: contacting the raw material powder of the beta molecular sieve with normal pressure and dynamic water vapour, and then with ammonium fluosilicate. The beta molecular sieve of the present invention has the features of a uniform skeleton structure of silicon and aluminum, an appropriate acidity, and a reasonable pore structure, and is suitable as an acidic component of a hydro-upgrading catalyst and a hydro-cracking catalyst for diesel oil.

Abstract: The present invention discloses a modified Y molecular sieve, a preparation method and a use of the modified Y molecular sieve, a supported catalyst, and a hydrocracking method. The silica-alumina mole ratio in the surface layer of the modified Y molecular sieve is 20-100:1, and the silica-alumina mole ratio in the body phase of the modified Y molecular sieve is 8-30:1. When a hydrocracking catalyst prepared from the modified Y molecular sieve is used for hydrocracking, the hydrocracking catalyst has higher reactivity and higher nitrogen tolerance. The hydrocracking catalyst prepared from the modified Y molecular sieve is suitable for use for increasing the yield of diesel oil, increasing the yield of chemical materials, and catalyzed hydrogenation conversion of diesel oil, etc.

Abstract: Provided is a Na—Y molecular sieve and a method for preparing the Na—Y molecular sieve, an H—Y molecular sieve and a method for preparing the H—Y molecular sieve, a hydrocracking catalyst, and a hydrocracking method. The average grain diameter of the Na—Y molecular sieve is 2-5 ?m, and the sum of pore volumes of pores in 1-10 nm diameter accounts for 70-90% of the total pore volume of the Na—Y molecular sieve. The H—Y molecular sieve obtained from the large-grain Na—Y molecular sieve can be used as an acidic component in the hydrocracking catalyst. When the hydrocracking catalyst containing the H—Y molecular sieve is applied in the hydrocracking reaction of heavy oils that contain macromolecules, it can provide better cracking activity and product selectivity in the hydrocracking reaction.

Abstract: Provided are hydrocracking catalysts comprising a cracking component and a hydrogenation component, wherein, for example: the cracking component comprises at least one molecular sieve present in an amount ranging from 0% to 20% by weight relative to the total weight of the catalyst and at least one amorphous silica-alumina present in an amount ranging from 20% to 60% by weight relative to the total weight of the catalyst; the hydrogenation component comprises at least one hydrogenation metal present in a total amount ranging from 34% to 75% by weight calculated by the mass of oxides, relative to the total weight of the catalyst; and the hydrocracking catalyst has a specific surface area ranging from 150 m2/g to 350 m2/g and a pore volume ranging from 0.20 cm3/g to 0.50 cm3/g, such as from 0.30 cm3/g to 0.45 cm3/g, and the product (M×S) of the percentage amount of the total mass of the hydrogenation metal (M) and the specific surface area (S) is equal to or more than 100 m2/g, i.e., M×S?100 m2/g.

Abstract: A database system based on a WEB application includes a database server (103) accessed by means of reading and writing a disk and a distributed memory database server (11), wherein the distributed memory database serve performs data synchronized with data read from the database server by a data synchronizing module (111); the distributed memory database server further includes a memory database Manager server (104) and more than one memory database Agent servers (105), wherein the memory database manager server performs uniform dispatch of memory resources, realizes the data synchronization between the database server and the distributed memory database, and provides the WEB application server (102) with a data access interface; and the memory database agent servers store specific data.