Abstract: The present invention relates to a nitrogen-containing diesel solidification point depressant composition, and preparation and application thereof. The nitrogen-containing diesel solidification point depressant composition includes the following components in percentage by weight: 10-40% of monoisopropanolamine; 10-40% of cyclohexane; 0-20% of polyethylene glycol; and 40-60% of N-tetradecyl methacrylamide-tetradecyl methacrylate. After the prepared diesel solidification point depressant composition is added to commercially available 0 #diesel, a solidification point and a cold filter plugging point of the diesel are respectively depressed by 21-25° C. and 9-13° C.

Abstract: The present invention relates to a nitrogen-containing terpolymer biodiesel solidification point depressant, and a preparation method and application thereof. The preparation method includes the following steps: 1) respectively preparing methylacrylic acid high carbon ester and N-hexadecyl methacrylamide; 2) adding the methylacrylic acid high carbon ester, the N-hexadecyl methacrylamide, and vinyl acetate to a solvent, and adding an initiator for polymerization to yield a methylacrylic acid high carbon ester-N-hexadecyl methacrylamide-vinyl acetate terpolymer, i.e., a nitrogen-containing terpolymer biodiesel solidification point depressant.

Abstract: The present invention relates to a nitrogen-containing terpolymer biodiesel solidification point depressant, and a preparation method and application thereof. The preparation method includes the following steps: 1) respectively preparing methylacrylic acid high carbon ester and N-hexadecyl methacrylamide; 2) adding the methylacrylic acid high carbon ester, the N-hexadecyl methacrylamide, and vinyl acetate to a solvent, and adding an initiator for polymerization to yield a methylacrylic acid high carbon ester-N-hexadecyl methacrylamide-vinyl acetate terpolymer, i.e., a nitrogen-containing terpolymer biodiesel solidification point depressant.

Abstract: The present invention relates to a nitrogen-containing diesel solidification point depressant composition, and preparation and application thereof. The nitrogen-containing diesel solidification point depressant composition includes the following components in percentage by weight: 10-40% of monoisopropanolamine; 10-40% of cyclohexane; 0-20% of polyethylene glycol; and 40-60% of N-tetradecyl methacrylamide-tetradecyl methacrylate. After the prepared diesel solidification point depressant composition is added to commercially available 0 #diesel, a solidification point and a cold filter plugging point of the diesel are respectively depressed by 21-25° C. and 9-13° C.

Abstract: A method and a device for verifying a recognition result in character recognition are provided. The device constructs a hidden Markov chain for a character string to be recognized, using recognition result output of a character recognition process. The recognition result includes candidate characters of each character in the character string. The device solves for an optimal path forming a candidate character string according to the hidden Markov chain and a pre-trained state transition matrix. The device recognizes non-Chinese characters in the character string according to state transition probabilities in the optimal path. The device verifies the recognition result according to the non-Chinese characters. The device feeds back a verification result to the character recognition process, wherein the character recognition process applied to the character string to be recognized is modified by the verification result.

Abstract: The invention relates to a valve, in particular to a valve with self-locking function which comprises a valve body, a valve element, a valve control assembly, an upper locking assembly and a lower locking assembly; the valve body comprises an upper box body, a lower box body, a water inlet pipe and a water outlet pipe; the lower end of the upper box body is fixedly connected and communicated with the lower box body, the left end of the lower box body is fixedly connected with the water inlet pipe, and the right end of the lower box body is fixedly connected with the water outlet pipe.

Abstract: The invention relates to a valve, in particular to a valve with self-locking function which comprises a valve body, a valve element, a valve control assembly, an upper locking assembly and a lower locking assembly; the valve body comprises an upper box body, a lower box body, a water inlet pipe and a water outlet pipe; the lower end of the upper box body is fixedly connected and communicated with the lower box body, the left end of the lower box body is fixedly connected with the water inlet pipe, and the right end of the lower box body is fixedly connected with the water outlet pipe.

Abstract: The invention relates to a valve, in particular to an anti-leakage self-sealing valve which comprises a valve support, a rotary gear, a lower connecting plate, an upper connecting plate, a pinion, an upper closing plate, a lower closing plate and a conical connecting cylinder, a connecting support, a connecting cylinder, a clamping mechanism, a disassembling mechanism, a connecting rod and a one-way mechanism.

Abstract: The invention relates to a valve, in particular to a quantitative water adjusting valve which comprises a valve body and a sealing pressure column, a control mechanism, a sealing element, a quantitative orifice plate and an end cover. The device disclosed by the invention is convenient to detach, so that the internal structure of the device is convenient to maintain; the valve can be quickly opened, and the valve can be slowly opened and closed through threads; under the condition that the water pressure is certain, the flow of water can be conveniently and quantitatively controlled.

Abstract: A method and a device for verifying a recognition result in character recognition are provided. The device constructs a hidden Markov chain for a character string to be recognized, using recognition result output of a character recognition process. The recognition result includes candidate characters of each character in the character string. The device solves for an optimal path forming a candidate character string according to the hidden Markov chain and a pre-trained state transition matrix. The device recognizes non-Chinese characters in the character string according to state transition probabilities in the optimal path. The device verifies the recognition result according to the non-Chinese characters. The device feeds back a verification result to the character recognition process, wherein the character recognition process applied to the character string to be recognized is modified by the verification result.

Abstract: An electric motor includes a stator having multiple magnetic poles and a rotor rotatably mounted to the stator. The rotor includes a shaft, a commutator and a rotor core fixed to the shaft; and windings wound on the rotor core and electrically connected to the commutator. The rotor core is formed by stacking a plurality of laminations. Each lamination includes an inner ring having a hole for fixing the shaft; an outer ring radially spaced from the inner ring; multiple teeth extending outwardly from the outer ring, and multiple ribs connecting the inner ring to the outer ring. Each rib has a width w measured in a circumferential direction of the lamination. The number of ribs is n. The width w and the number n satisfy the formula: 0.75?n×w2?64, where the width w is measured in millimeters.

Abstract: Disclosed in the present invention are a chromium-free gas phase fluorination catalyst and an application thereof. The precursor of the related chromium-free gas phase fluorination catalyst consists of a compound containing iron element, a compound containing rare earth metal element and a compound containing element A, wherein element A is one selected from Ca, Al, Mg and Ti, the precursor is subjected to roasting and fluorination treating to obtain the chromium-free gas phase fluorination catalyst. The precursor of the catalyst is roasted at 400-500° C. and fluoridized with hydrogen fluoride at 350-450° C. to obtain the chromium-free gas phase fluorination catalyst. The catalyst has characteristics of being chromium-free and environment-friendly, good catalytic activity and long life etc. The catalyst can be used for preparing hydrofluoroolefins or hydrochlorofluoroolefins from halohydrocarbons.

Abstract: Disclosed in the present invention are a chromium-free gas phase fluorination catalyst and an application thereof. The precursor of the related chromium-free gas phase fluorination catalyst consists of a compound containing iron element, a compound containing rare earth metal element and a compound containing element A, wherein element A is one selected from Ca, Al, Mg and Ti, the precursor is subjected to roasting and fluorination treating to obtain the chromium-free gas phase fluorination catalyst. The precursor of the catalyst is roasted at 400-500° C. and fluoridized with hydrogen fluoride at 350-450° C. to obtain the chromium-free gas phase fluorination catalyst. The catalyst has characteristics of being chromium-free and environment-friendly, good catalytic activity and long life etc. The catalyst can be used for preparing hydrofluoroolefins or hydrochlorofluoroolefins from halohydrocarbons.

Abstract: Disclosed is a process for the preparation of 2,3,3,3-tetrafluoropropene, comprising the following two reaction steps: a. a compound having the formula CF3-xClxCF2-yClyCH2Cl undergoes gas-phase fluorination with hydrogen fluoride through n serially-connected reaction vessels in the presence of a compound catalyst, producing 2,3-dichloro-1,1,1,2-tetrafluoropropane, 1,2,3-trichloro-1,1,2-trifluoropropane, and 1,3-dichloro-1,1,2,2-tetrafluoropropane; in said formula, x=1, 2, 3, y=1, 2, and 3?x+y?5; b. the 2,3-dichloro-1,1,1,2-tetrafluoropropane, 1,2,3-trichloro-1,1,2-trifluoropropane, and 1,3-dichloro-1,1,2,2-tetrafluoropropane undergo gas-phase dehalogenation with hydrogen in the presence of a dehalogenation catalyst, producing 2,3,3,3-tetrafluoropropene and 3-chloro-2,3,3-trifluoropropene, then separation and refining are performed, producing 2,3,3,3-tetrafluoropropene. The present invention is primarily used to produce 2,3,3,3-tetrafluoropropene.

Abstract: Disclosed in the present invention is a chromium-free catalyst for gas-phase fluorination and an application thereof. The precursor of the related chromium-free catalyst for gas-phase fluorination consists of a compound containing iron element, a compound containing rare earth metal element and a compound containing element A, wherein element A is one selected from Ca, Al, Mg and Ti, the precursor is subjected to calcination and fluorination treatment to obtain the chromium-free catalyst for gas-phase fluorination. The precursor of the catalyst is calcined at 400-500° C. and fluorinated with hydrogen fluoride at 350-450° C. to obtain the chromium-free fluorinated catalyst. The catalyst has characteristics of being chromium-free and environment-friendly, good catalytic activity and long life etc. The catalyst can be used for preparing hydrofluoroolefins or hydrochlorofluoroolefins from halohydrocarbons.

Abstract: Disclosed is a process for the preparation of 2,3,3,3-tetrafluoropropene, comprising the following two reaction steps: a. a compound having the formula CF3-xClxCF2-yClyCH2Cl undergoes gas-phase fluorination with hydrogen fluoride through n serially-connected reaction vessels in the presence of a compound catalyst producing 2,3-dichloro-1,1,1,2-tetrafluoropropane, 1,2,3-trichloro-1,1,2-trifluoropropane, and 1,3-dichloro-1,1,2,2-tetrafluoropropane; in said formula, x=1, 2, 3, y=1, 2, and 3?x+y?5; b. the 2,3-dichloro-1,1,1,2-tetrafluoropropane, 1,2,3-trichloro-1,1,2-trifluoropropane, and 1,3-dichloro-1,1,2,2-tetrafluoropropane undergo gas-phase dehalogenation with hydrogen in the presence of a dehalogenation catalyst, producing 2,3,3,3-tetrafluoropropene and 3-chloro-2,3,3-trifluoropropene, then separation and refining are performed, producing 2,3,3,3-tetrafluoropropene. The present invention is primarily used to produce 2,3,3,3-tetrafluoropropene.

Abstract: Disclosed are a key storage device and a method for using same, so as to improve security of storage and use of a key, and further improve the security of a process of identity verification. The key storage device comprises: a security module (11), configured to store a key, the key being used for verifying an identity of a user; an operational module (12), configured to generate identity verification information when identity verification needs to be performed, the identity verification information at least comprising processed seed information obtained after the seed information is processed by using the key stored in the security module, and the seed information being any information that can be processed by a computer system; and a key exchange module (13), configured to exchange the identity verification information with an external device.

Abstract: Disclosed in the present invention is a chromium-free catalyst for gas-phase fluorination and an application thereof. The precursor of the related chromium-free catalyst for gas-phase fluorination consists of a compound containing iron element, a compound containing rare earth metal element and a compound containing element A, wherein element A is one selected from Ca, Al, Mg and Ti, the precursor is subjected to calcination and fluorination treatment to obtain the chromium-free catalyst for gas-phase fluorination. The precursor of the catalyst is calcined at 400-500° C. and fluorinated with hydrogen fluoride at 350-450° C. to obtain the chromium-free fluorinated catalyst. The catalyst has characteristics of being chromium-free and environment-friendly, good catalytic activity and long life etc. The catalyst can be used for preparing hydrofluoroolefins or hydrochlorofluoroolefins from halohydrocarbons.

Abstract: The invention discloses an identity verifying method, apparatus and system, and related devices so as to improve the security and universality of identity verification. The identity verifying system includes: a verification information generating device configured to generate user identity verification information for identity verification to be performed, wherein the user identity verification information includes at least processed seed information into which seed information is processed using a stored key; and an identity verifying server configured to receive an identity verification request carrying the processed seed information, sent by a terminal device; to search locally stored keys for a key corresponding to the key stored in the verification information generating device; to recover and/or verify the processed seed information using the found key; and to determine from a recovery result or a verification result whether the identity verification is passed.

Abstract: An electric motor includes a stator having multiple magnetic poles and a rotor rotatably mounted to the stator. The rotor includes a shaft, a commutator and a rotor core fixed to the shaft; and windings wound on the rotor core and electrically connected to the commutator. The rotor core is formed by stacking a plurality of laminations. Each lamination includes an inner ring having a hole for fixing the shaft; an outer ring radially spaced from the inner ring; multiple teeth extending outwardly from the outer ring, and multiple ribs connecting the inner ring to the outer ring. Each rib has a width w measured in a circumferential direction of the lamination. The number of ribs is n. The width w and the number n satisfy the formula: 0.75?n×w2?64, where the width w is measured in millimeters.