External reverse gear unit of speed variator for motorcycle engine

An external reverse gear unit for the speed variator of motorcycle is composed of a case assemblage for changing the rotational direction of driven axle, a manipulating mechanism installed on case body for driving the driven axle to change its rotational direction, and a reverse gear controlling drive for controlling the said manipulating mechanism. It features that the reverse gear can only be performed at low gear position, that is, reverse gear position "I", resulting in higher safety.

High-frequency coaxial connector

The invention discloses a high-frequency coaxial connector, comprising a first element and a second element; wherein, the first element comprises a first outer conductor and a center conductor; the second element comprises a second outer conductor and a second center conductor; a pressure spring is arranged between the first outer conductor and the second outer conductor, and the first outer conductor is electrically connected with the second outer conductor; the first center conductor is electrically connected with the second center conductor; a first insulator is filled between the first outer conductor and the first center conductor and is solid. The coaxial connector of the invention can be suitable for large axial direction deflection and large radial angular deflection, and has excellent and stable voltage standing wave ratio within the specified tolerance range. The connector does not need an adapter, therefore remarkably simplifying the connection structure,, reducing the cost, ...

RF coaxial connector

The invention discloses a radio frequency coaxial connector which comprises a socket and an adaptor. The socket comprises an outer conductor and a center conductor. The plug on the adaptor can be inserted into the socket. The adaptor further comprises an outer conductor and a center conductor, and forms the contact fit with the outer conductor and the center conductor on the socket respectively. A dumb-bell shaped first insulator is arranged in the plug of the adaptor and is filled between the outer conductor and the center conductor. The middle part of the first insulator is thinner than the two end parts thereof, so as to form a ring-shaped gap between the middle part of the first insulator and the outer conductor of the adaptor. Different impedance regions are formed in a coupling region of the plug and the socket, and the impedance complementation is formed between a high-impedance region and a low-impedance region, thereby reducing the adverse effect of the high-impedance region of ...

Method for mfg. electric connector containing multi-conducting terminals and metal frame by plugging shaping method

Intelligent environment-friendly outdoor garbage bin capable of being recycled

The utility model discloses an intelligent environment-friendly outdoor garbage bin capable of being recycled. Garbage bin shell, the garbage bin shell is of a hollow structure with an opening in thetop. Supporting legs are fixedly connected to the four corners of the bottom of the garbage bin shell correspondingly. A matched inner barrel is arranged in the garbage bin shell; the top end of the inner barrel is opened; two symmetrical movable plates are hinged to the inner wall, close to the top end, of the garbage bin shell. The movable plate is positioned above the inner barrel; the sides, away from the inner wall of the garbage bin shell, of the two movable plates abut against each other, T-shaped sliding grooves are formed in the positions, corresponding to the movable plates, of the inner wall of the garbage bin shell, T-shaped sliding blocks matched with the T-shaped sliding grooves are slidably connected into the T-shaped sliding grooves, and first springs are fixedly connectedto ...

Transmembrane protein complex gene and application thereof in preparation of recombinant human-like collagen through biological fermentation

The invention discloses a transmembrane protein complex gene and application thereof in biological fermentation preparation of recombinant human-like collagen, the transmembrane protein complex gene comprises three segments of genes, the nucleotide sequence of the first segment of gene is as shown in SEQ ID NO.1, the nucleotide sequence of the second segment of gene is as shown in SEQ ID NO.2, the nucleotide sequence of the third segment of gene is as shown in SEQ ID NO.2, and the nucleotide sequence of the fourth segment of gene is as shown in SEQ ID NO.2. And the third segment of gene is selected from a human collagen gene segment capable of expressing human collagen with the molecular weight of 6-12kDa. According to the method, the third-section target gene human-like collagen is secreted and expressed to the fermentation liquor or the periplasmic space of escherichia coli by adopting an escherichia coli transmembrane protein complex, periplasmic protein is centrifuged and extracted, ...

High-frequency coaxial connector

The invention discloses a high-frequency coaxial connector, comprising a first element and a second element; wherein, the first element comprises a first outer conductor and a center conductor; the second element comprises a second outer conductor and a second center conductor; a pressure spring is arranged between the first outer conductor and the second outer conductor, and the first outer conductor is electrically connected with the second outer conductor; the first center conductor is electrically connected with the second center conductor; a first insulator is filled between the first outer conductor and the first center conductor and is solid. The coaxial connector of the invention can be suitable for large axial direction deflection and large radial angular deflection, and has excellent and stable voltage standing wave ratio within the specified tolerance range. The connector does not need an adapter, therefore remarkably simplifying the connection structure,, reducing the cost, ...

Method for mfg. electric connector containing multi-conducting terminals and metal frame by plugging shaping method

An insertion method for manufacturing the electric connector containing multiple electric conducting terminals and a metallic framke includes assembling said terminals and metallic frame together, putting it in mould cavity, inserting the detachable first and second fixers between adjacent terminals from their free ends and tail ends, espectively, and filling the fused resin in the mould cavity to form an insulating casing.

RF coaxial connector

The invention discloses a RF coaxial connector, which includes a socket and an adapter. The socket includes an outer conductor and a center conductor. The adapter includes a plug capable of being inserted into the socket. The adapter also includes an outer conductor and a center conductor that can be in contact with the outer conductor and the center conductor of the socket, respectively. A dumbbell-shaped first insulating body is disposed inside the plug of the adapter and filled between the outer conductor and the center conductor of the adapter. The first insulating body has a middle portion narrower than two end portions thereof such that an annular gap is formed between the middle portion of the first insulating body and the outer conductor of the adapter, thereby forming different impedance regions at the connection regions of the plug and the socket. Therefore, a high impedance region and a low impedance region can compensate each other so as to decrease the adverse effect of the ...

2, 4-diaminobutyric acid transferase mutant gene and application thereof

The invention discloses a 2, 4-diaminobutyric acid transferase mutant gene and application thereof, and the gene encodes a 2, 4-diaminobutyric acid transferase mutant with an amino acid sequence as shown in SEQ ID NO.2. The invention also discloses a preparation method of the 2, 4-diaminobutyric acid transferase mutant. The mutant gene is applied to synthesis of ectoine, firstly, expression cassettes of 2, 4-diaminobutyric acid transferase mutant gene EctBm, 2, 4-diaminobutyric acid acetyltransferase EctA and ectoine synthetase EctC are constructed, the 2, 4-diaminobutyric acid transferase mutant gene, the 2, 4-diaminobutyric acid acetyltransferase gene and the ectoine synthetase gene are co-expressed, and then the ectoine synthetase is synthesized. According to the method, 2, 4-diaminobutyric acid is used as a raw material to obtain a 2, 4-diaminobutyric acid transferase mutant, 2, 4-diaminobutyric acid acetyltransferase and ectoine synthetase, and on the basis, glucose or glycerol is ...

Method for controlling acquisition of alloy films on multi-arc ion plating machine and proportional regulator thereof

The invention discloses a method for controlling acquisition of alloy films on a multi-arc ion plating machine and a proportional regulator thereof. The proportional regulator for regulating screening cathode plasma flux is arranged in front of one of vacuum cathode target boots; the proportional regulator is a double-layer circular baffle plate with annular holes, the annular holes of the two baffle plates are the same and account for a certain proportion of the whole circular baffle plate, and the centers of the two baffle plates are provided with a guide pillar and a guide bush for rotating the baffle plates mutually; and the rotating angle of the double-layer circular baffle plate of the proportional regulator can be regulated. The flux of cathode plasma is regulated by regulating the rotating angles of the two plates of the proportional regulator so as to control the proportion of components in the plasma atmosphere; and multi-element multilayer composite films are prepared by controlling ...

Novel method for storing breeding eggs and its egg rack turning device

Human-derived urate oxidases with catalytic activity

The invention relates to a series of human-derived urate oxidases with catalytic activity, DNA sequences encoding them, expression vectors containing the DNA sequences, as well as host cells containing the expression vectors. The human-derived urate oxidases have recombinant amino acid residue sequences obtained by specific locus amino acid residue replacement or exon locus amino acid residue replacement on the basis of SEQ ID NO:17. According to the invention, human urate oxidase pseudogene is successfully revived, and human-derived urate oxidases with catalytic activity can be expressed. Thus, the human-derived urate oxidases with catalytic activity have good prospects in preparation of low immunogenicity and even low immunogenicity uric acid lowering drugs.

Method for synthesizing maltose acid by catalyzing maltose through glucose dehydrogenase

The invention discloses a method for synthesizing maltose acid by catalyzing maltose through glucose dehydrogenase, and belongs to the field of biological medicine. The method comprises the following steps: cloning a glucose dehydrogenase gene Ecgdh by taking escherichia coli as a template; constructing a recombinant expression glucose dehydrogenase gene Ecgdh system, and expressing glucose dehydrogenase; maltose is used as a substrate, NADH is used as an electron donor, and maltose acid is prepared through catalysis of glucose dehydrogenase; the nucleotide sequence of the glucose dehydrogenase gene Ecgdh is as shown in SEQ ID NO. 1. Compared with quinone protein glucose dehydrogenase taking PQQ as a cofactor, the glucose dehydrogenase obtained by the invention has the advantages that the yield is greatly increased, and compared with other quinone protein glucose dehydrogenase, the glucose dehydrogenase has stronger substrate preference on maltose, is suitable for large-scale preparation ...

Preparation method for wear-resistant thermally-sprayed composite copper-aluminum alloy coating and coating material

The invention discloses a preparation method for a wear-resistant thermally-sprayed composite copper-aluminum alloy coating and a coating material. The preparation method sequentially comprises the following steps: (1) uniformly mixing copper-aluminum alloy powder and self-fusible alloy powder to prepare thermal spraying mixed powder, wherein the mixed powder comprises the following elements in percentage by weight: 80-85% of copper, 9-14% of aluminum, 3.8-4.3% of nickel, 0.5-1.5% of chromium, 0.5-1.5% of iron, 0-2% of boron, 0-2% of silicon and 0-2% of carbon; (2) treating the surface of a workpiece; (3) preheating the workpiece at 250-300 DEG C; (4) thermally spraying a priming coat on the surface of the workpiece; (5) thermally spraying the thermal spraying mixed powder obtained in the step (1) on the surface of the priming coat; (6) remelting, cooling, preserving heat at 350-550 DEG C for 1-2 hours, and cooling to obtain the coating. The coating has relatively high wear resistance and ...

Pichia pastoris engineering strain with high yield of HBD-2 as well as preparation method and application of pichia pastoris engineering strain

The invention discloses a high-yield HBD-2 pichia pastoris engineering strain as well as a preparation method and application thereof, and belongs to the technical field of biological medicines. According to the invention, pichia pastoris is taken as an expression strain, and a synthetic route of the human beta-defensin 2 is constructed by co-expressing a gene h beta D-2 for coding the human beta-defensin, a gene Trxa for coding thioredoxin, a gene DscA for coding protein disulfide isomerase and an enterokinase gene rEK, so that an accumulation strain of the human beta-defensin 2 is obtained. A new strategy is provided for synthesis of the human beta-defensin 2, the production efficiency is obviously improved compared with that of enzyme method cutting recombinant defensin and chemical method synthesis defensin, the production cost is greatly reduced, and a foundation is laid for industrial large-scale production of defensin.

Emergency fire-extinguishing device for chimney of sulfur recovery device

The invention relates to an emergency fire-extinguishing device for a chimney of a sulfur recovery device. The emergency fire-extinguishing device for the chimney of the sulfur recovery device specifically comprises pipe network steam, a temperature adjustment valve and a normally open valve II which are connected with the chimney in sequence through pipelines; a condensate discharging valve is arranged between the pipe network steam and the temperature adjustment valve; a bypass adjustment valve is arranged at the upper end of the temperature adjustment valve; the temperature adjustment valve is connected with the chimney through a thermocouple and a signal line; a normally open valve I is connected between the pipe network steam and the temperature adjustment valve. By adopting the emergency fire-extinguishing device for the chimney of the sulfur recovery device disclosed by the invention, when sulfur in the chimney of the sulfur recovery device is in contact with oxygen and combusts ...

Novel method for storing breeding eggs and its egg rack rotary device

The present invention provides a new method for storing hatching eggs, which has the steps that: an adjustable thermostatic chamber provides temperature and humidity; the potassium permanganate and formalin is used for disinfecting the thermostatic chamber under the condition that the room temperature is 25 DEG C and the relative temperature is 75 percent; the hatching egg is positioned at an egg rack after being disinfected, and then the egg rack is positioned in the thermostatic chamber, and the environmental temperature in the room is slowly reduced to 8.5 DEG C according to the cooling rate of 2 to 3 DEG C per hour; during the storage period, the indoor temperature is kept at 8.5 to 9.5 DEG C and the relative humidity at 55 percent to 60 percent; at the same time, the air with 19V Percent to 20V percent oxygen and 79V percent to 80V percent nitrogen are input into the room so as to replace the indoor air; during the storage period, the egg rack is regularly overturned with an overturning ...

RF coaxial connector

The invention discloses a radio frequency coaxial connector which comprises a socket and an adaptor. The socket comprises an outer conductor and a center conductor. The plug on the adaptor can be inserted into the socket. The adaptor further comprises an outer conductor and a center conductor, and forms the contact fit with the outer conductor and the center conductor on the socket respectively. A dumb-bell shaped first insulator is arranged in the plug of the adaptor and is filled between the outer conductor and the center conductor. The middle part of the first insulator is thinner than thetwo end parts thereof, so as to form a ring-shaped gap between the middle part of the first insulator and the outer conductor of the adaptor. Different impedance regions are formed in a coupling region of the plug and the socket, and the impedance complementation is formed between a high-impedance region and a low-impedance region, thereby reducing the adverse effect of the high-impedance region of ...