Abstract: The present disclosure provides a charging system, charging method, and charging control device. The charging system comprises a charger configured to be coupled to an external power source with its one end; a plurality of secondary batteries configured to be coupled to the charger, respectively; and a control device configured to be coupled to the charger and the plurality of secondary batteries, to control the charger to perform a charging operation on the plurality of secondary battery. According to the present disclosure, the secondary batteries having harmonics with identical frequencies and opposite phases are connected in parallel for charging, to reduce or eliminate the harmonic distortion generated by high order harmonics, and effectively reduce the value of THD.

Abstract: A surgical milling cutter includes a milling cutter bracket, a locking device and a bottom electric motor connected successively. The milling cutter bracket includes a fixing seat with a through hole. A finger guide apparatus with an L-type first bracket at the top end thereof is provided on the upper part of the fixing seat. The end of the L-type first bracket's short side is provided with a downward projection. The lowest point of the projection is lower than that of the milling cutter's cylindrical head when the milling cutter is working normally. The surgical milling cutter utilizes the projection to prevent the possibility of an object contacting with the cylindrical head, thus avoiding an object being cut unevenly. Meanwhile, the L-type bracket can be driven by the finger guide apparatus to rotate so as to change the running direction of the milling cutter, thus facilitating surgical procedures.

Abstract: A method for purifying levo-oxiracetam is disclosed. Crude levo-oxiracetam is dissolved in water; an organic solvent is added dropwise into the solution until the solution just turns turbid; the solution is allowed to stand for 1 to 3 days at 0° C. to 18° C.; a colorless transparent crystal is precipitated; the solution is filtered and top-washed with cold water of 0° C. to 5° C.; and the product is dried in vacuum to obtain high-purity levo-oxiracetam.

Abstract: The present invention is to provide uses of the L-oxiracetam in preparation of medicines for preventing or treating coma. Experimental results show that L-oxiracetam wake-promoting effects of alcoholism-induced coma is obvious, and D-oxiracetam has basically no effect. The effect of the above wake-promoting effects of L-oxiracetam is 2 times greater than racemic oxiracetam. The wake-promoting effects of L-oxiracetam on trauma or anesthesia-induced coma are both significant.

Abstract: An (S)-4-hydroxy-2-oxo-1-pyrrolidine acetamide racemate referred to as (S)-oxiracetam crystal form II has a diffraction peak at a diffraction angle 2? of 10.669, 13.25, 13.847, 14.198, 16.729, 17.934, 18.746, 18.816, 20.273, 20.413, 21.431, 21.617, 21.663, 23.38, 24.324, 24.415, 26.069, 26.107, 27.901, 28.621, 28.925, 29.449, 29.484, 31.702, 36.516, 37.685, or 39.721 degrees. The purity of the (S)-oxiracetam crystal form II can be up to 98.5%, and the (S)-oxiracetam crystal form II has the advantages of simple preparation method, mild control condition, low production cost, and the produced oxiracetam hydrate crystal form II has a high purity (the oxiracetam hydrate crystal form having a purity of 8%˜98.5% can be prepared by a crude levo-oxiracetam having a purity of 92%, and thus having a good reproducibility in production.

Abstract: A preparation method for medical porous tantalum implant material is provided, which includes mixing polyethylene glycol aqueous solution and tantalum powder to form tantalum slurry, casting the tantalum slurry into an organic foam body through vibrant pressurization, and going through steps of drying, degreasing, vacuum sintering and thermal treatment to obtain the porous tantalum. The solution is a 2-8 wt % polyethylene glycol aqueous solution, the frequency of vibration is 20-80 times/min, the thermal treatment is performed under 10?4-10?3 Pa of vacuity and the temperature is increased to 800-900° C. at a rate of 10-20° C./min and keeping the temperature for 240-480 minutes, then decreased to 400° C. at a rate of 2-5° C./min and keeping the temperature for 120-300 minutes, and cooled down to the room temperature naturally in the furnace.

Abstract: Disclosed is a 4-hydroxy-2-oxo-1-pyrrolidineacetamide racemate crystal form I which is prepared by the following steps: dissolving crude 4-hydroxy-2-oxo-1-pyrrolidineacetamide racemate in a solvent such as a micromolecular alcohol to form a saturated solution; heating and stirring the solution overnight at 38˜42° C. to obtain a suspended precipitate; filtering and drying the solution to obtain a crystal. Such 4-hydroxy-2-oxo-1-pyrrolidineacetamide racemate crystal form I has a purity as high as 99.5%, which has significant treatment effect on curing respective diseases, and the 4-hydroxy-2-oxo-1-pyrrolidineacetamide racemate crystal form I has the features of simple manufacturing method, mild control condition, and low production cost, and its yield rate is as high as 99.5% which is applicable for mass production.

Abstract: A method for purifying (S)-oxiracetam is disclosed. Crude (S)-oxiracetam with the purity of 89% is dissolved in water; the solution is allowed to stand for 1 to 3 days at 0° C. to 18° C.; a colorless transparent crystal is precipitated; the solution is filtered and top-washed with cold water to 0° C. to 5° C.; and the product is dried in vacuum to obtain high-purity (S)-oxiracetam.

Abstract: An optical isolator capable of creating a larger safe buffer area for optical beam(s) and a manufacturing method thereof are disclosed. The optical isolator includes a sandwich type wafer, a first polarizer, a Faraday rotator and a second polarizer. The first polarizer works as the incident plane of the FSI (free space isolator), while the second polarizer works as the outgoing plane of the FSI. The direction in which the second polarizer passes the polarized beam is at a 45° angle with respect to the first polarizer. The manufacturing method includes marking the edge of the second polarizer. FSIs processed by this method provide a larger buffer area for the optical beam(s) and/or a lower manufacturing cost, even though the size of the FSI is unchanged.

Abstract: A porous tantalum rod is provided, which is a medical implantation used for treating collapsed articular surface of the femoral head or necrosis of the femoral head in phase I or phase II. The implantation includes a fastening structure formed on one end of the porous tantalum rod used for connecting with the osseous tissues and a through hole formed on the center of the porous tantalum rod. The porous tantalum rod is made of the porous tantalum material, which is produced by foam impregnation and had a foam structure with three-dimensional interconnecting pores, wherein the foam structure has a foam skeleton, tantalum particles located on the foam skeleton, and multiple sintering neck structures formed between the tantalum particles.

Abstract: In a test data management method, an electronic signal that needed to be tested of an electronic device is select. A predefined template file of a test report of the electronic signal is generated. Test data of the electronic signal is obtained from a test file, and is inserted into predetermined locations of the template file. The test report of the electronic signal is generated according to the template file and the inserted test data, and the test report is stored into a storage system of a computing device.

Abstract: A surgical milling cutter includes a milling cutter holder, a locking device, a locking seat, and a main machine. The milling cutter holder includes a fixing seat with a through hole. A finger guider with an L-type holder on a top end thereof is arranged at an upper part of the fixing seat. A distal end of a short side of the L-type holder is disposed with a downward projection, and a lowest point of the projection is lower than that of a cylindrical head when the milling cutter works normally. A bolt with a central through hole is fixed in a cavity of the finger guider. A pressing disk is arranged at the upper part of the fixing seat, and a nut is connected to the bolt through a hole in the pressing disk.

Abstract: A surgical milling cutter includes a milling cutter bracket, a locking device and a bottom electric motor connected successively. The milling cutter bracket includes a fixing seat with a through hole. A finger guide apparatus with an L-type first bracket at the top end thereof is provided on the upper part of the fixing seat. The end of the L-type first bracket's short side is provided with a downward projection. The lowest point of the projection is lower than that of the milling cutter's cylindrical head when the milling cutter is working normally. The surgical milling cutter utilizes the projection to prevent the possibility of an object contacting with the cylindrical head, thus avoiding an object being cut unevenly. Meanwhile, the L-type bracket can be driven by the finger guide apparatus to rotate so as to change the running direction of the milling cutter, thus facilitating surgical procedures.

Abstract: A craniotomy drill includes a main machine, a retarder and a locking seat. A drill transmission rod connected to the output shaft of the retarder is inserted in the locking seat. The main machine comprises a handle at the lower portion and an accommodating part at the upper portion, with a stator and a rotor of a DC electric motor being provided inside the accommodating part and a wall of the accommodating part being the stator housing of the DC electric motor. This craniotomy drill has a simple structure with the wall of the accommodating part as the stator housing of the electric motor, such that the volume and the weight are reduced. It is safe in use without the risk of the electric motor sliding out. By utilizing materials and processes of water resistant technology and an integrative design, a relatively good water resistant performance is achieved.

Abstract: A drill head locking apparatus and a drill head are provided. The locking apparatus includes a protruding platform having a through hole, a bearing on the inner wall of a small cylinder on the protruding platform, a locking sleeve fitted on the protruding platform, and a protrusion arranged on the upper part of the inner wall of the locking sleeve. The lower part of the inner wall of the locking sleeve is a conical face. A spring is arranged between the bottom face of the conical face and an upper bottom face of the protruding platform. A press plate is connected with a screw thread on the outer wall of the top part of the small cylinder on the protruding platform and presses down on the protrusion. A conical hole is arranged on the wall of the small cylinder and communicates with the through hole of the protruding platform.

Abstract: A drill bit locking device and a drill bit are provided. The locking device includes a boss with a through hole, a bearing and a support member are arranged an inner wall of a small cylinder above the boss; a locking sleeve is sleeved over the boss, a first bulge is on an inner wall of an upper part of the locking sleeve, and a second bulge is on an inner wall of a lower part; a spring is between the second bulge and an upper bottom surface of the boss; a press plate is threadedly connected with an outer wall of a top part of the small cylinder and presses against the first bulge; holes of different sizes are on the inner wall of the small cylinder and the support member to form a stepped hole, and a steel ball is arranged in the stepped hole.

Abstract: A surgical milling cutter bracket includes a retaining base having a through hole. The upper part of the retaining base is provided with a finger guide having an L-shaped support frame on the top of the finger guide. A downward protrusion is provided at the end of the short side of the L-shaped support frame. The lowest point of the protrusion is lower than the lowest point of the cylindrical head of the milling cutter during normal operation of the milling cutter. A bolt having a through hole at the center is fixed within the cavity of the finger guide. A depressor is provided on the upper part of the retaining base. The bolt passes through a hole of the depressor and is connected to a nut. The protrusion is able to prevent an object from contacting the cylindrical head, thus avoiding cutting the object unevenly.

Abstract: A crystal form I of (S)-4-hydroxy-2-oxo-1-pyrrolidine acetamide, or named (S)-oxiracetam, is provided, which is characterized by a powder x-ray diffraction pattern that exhibits data of d-values versus the relative intensities as: 7.075(M), 5.355(S), 5.092(S), 4.590(M), 4.325(M), 4.259(S), 4.041(VS), 3.808(M), 3.542(M), 3.445(M), 3.393(M), 2.972(M), 2.914(S). A method for preparing a crystal form I of (S)-oxiracetam is also provided, which includes preparing the crude product and crystallizing A use of the crystal form I of (S)-oxiracetam in the manufacture of a medicament for preventing and treating memory dysfunction is also provided. Accordingly, the crystal form I of (S)-oxiracetam prepared by the method has high purity of more than 99.3% based on the percentages of the mass, with better efficacy than (S)-oxiracetam for preventing or treating memory dysfunction.

Abstract: A preparation method of (S)-4-hydroxy-2-oxo-1-pyrrolidine acetamide is provided, which includes the steps of preparing the crude product and crystallizing, wherein acetone and water are used as solvents in the step of crystallizing. The (S)-oxiracetam prepared by the method of the present invention has high purity of more than 99.3% and low impurity of 0-0.5%, based on the percentages of the mass. According to the method of the present invention, with regard to the way of charging materials, adding inorganic base only just a few times is easier to handle and more convenient to the industrial manufacturing and application.

Abstract: A porous tantalum used for medical implantation is provided, which includes a foam structure with three-dimensional interconnecting pores and produced by: mixing a solution made by organic binder and dispersant and tantalum powder to form tantalum slurry, casting the tantalum slurry into a organic foam body through impregnation until the pores of the organic foam body are filled, drying the impregnated organic foam body with the tantalum slurry to remove the dispersant, degreasing the dried organic foam body to separate the organic binder and the organic foam body from the dried tantalum slurry in a protective environment of inert gas, vacuum sintering the dried tantalum slurry to obtain a porous sintered body, and vacuum annealing then treating the porous sintered body with normal post-treatments to obtain the porous tantalum. Accordingly, the porous tantalum has well-distributed interconnecting pores and sintering neck structures resulting in good mechanical properties, and especially good ductility.