32results about How to "Little impact on the surrounding environment" patented technology

Provided is a making method of a tunable semiconductor laser and a tunable semiconductor laser, wherein the making method comprises the following procedures: growing lower waveguide layer, multiple quantum trap structure, upper waveguide layer and indium phosphide layer epitaxially and sequentially on the n type substrate; growing earth silicon dielectric membrane on the epitaxial layer; dividing into active waveguide region and raster region; butting passive waveguide portion; removing earth silicon dielectric membrane and indium phosphide layer on the surface of the active waveguide region; growing ridge waveguide indium phosphide material and low resistivity InGaAs ternary layer sequentially; growing earth silicon dielectric membrane; making raster graphic of the ridge waveguide and the ridge waveguide on the raster region; etching raster of the ridge waveguide and the ridge waveguide on the raster region; growing earth silicon dielectric membrane continuously; opening the window separately on active waveguide region and raster region in order to make electrode isolation ditch; making P face and N face electrode of laser. The product of the invention has good product property and high automation degree of the product making, which simplifies the technology process and has good product ratio.

The invention discloses a human body movement reconstruction and analysis system and method based on inertial sensing units. The system comprises a pose information acquisition system, a WIFI wireless router and a central computer. The pose information acquisition system is composed of the inertial sensing units. The inertial sensing units are installed on multiple parts of a human body respectively to collect accelerated velocities, angular velocities and magnetic information of all the parts in real time and fuse the accelerated velocities, the angular velocities and the magnetic information to obtain pose information such as pose angles, quaternions and Euler angles; next, the collected information and the fused information are sent to the central computer through the WIFI wireless router in a WIFI mode; the central computer fuses pose information data of all the inertial sensing units to complete human body movement reconstruction and extracts movement parameters such as positions, velocities, angles, the accelerated velocities and angular accelerated velocities, and the movement parameters are used for biomechanical analysis and kinematic analysis of human body movement. By means of the human body movement reconstruction and analysis system and method, influences on the movement of a subject are reduced to the maximum extent, the requirements for capturing the movement of the whole body of the subject and the special movement of a specific part of the subject are both met, and the system and method are suitable for various application occasions.

The invention discloses a method for measuring solvent volume by optical fiber. First, a main controller is connected to an optical fiber probe, a reagent bottle is placed in a water tank, the optical fiber probe extends into the water tank, and is placed symmetrically on both sides of the reagent bottle; Solvent, the optical fiber probe collects the data of N times of photometric feedback values, and then obtains the first collected data Q=the sum of N times data / N, and saves it as the initial value; when the volume is fixed, the optical fiber probe collects the current data Q 1 , the main controller will get the X from the initial value / current data 1 Compare with trigger value, if X 1 If it is less than the trigger value, then collect N times of data again, and set the ratio of initial value / current data to X 2 Compare with trigger value, if X 2 If the value is greater than the trigger value, the false trigger delay is prevented. After the delay, the fiber probe collects N times of data, and the ratio of the initial value / current data is X 3 Compare with trigger value, if X 3 If it is greater than the trigger value, it is judged that the solvent has reached the required measurement volume. In this case, the step response is used for constant volume, and the measurement speed is fast and the accuracy rate is high.

The invention discloses a four-arm helical antenna of a novel feed structure, which comprises a ceramic pillar, an upper printed circuit board (PCB), a lower PCB and a PCB printed connection board. The axis of the ceramic pillar is provided with a through hole. The lower part of the outer side surface of the ceramic pillar is provided with BALUN lines along the circumferential direction. Four metal helical arms are wound onto the outer side surface of the ceramic pillar at intervals. The upper surface and the lower surface of the upper PCB are respectively printed with a fan-shaped upper conductive layer and a fan-shaped lower conductive layer. The metal adjustment regions of the first and second metal helical arms of the four metal helical arms are electrically connected with the fan-shaped upper conductive layer through the welding process. The third and fourth metal helical arms of the four metal helical arms are coupled to the fan-shaped lower conductive layer. The front side surface of the PCB printed connection board is provided with a grounding metal region and an input end region at the upper part of the PCB printed connection board. The fan-shaped lower conductive layer is electrically connected with the grounding metal region of the PCB printed connection board. According to the invention, the return loss is smaller than -25 dB, and the vertex gain is greater than -2 dB. Therefore, the overall size of an antenna is effectively reduced, and the antenna is good in circularly-polarized performance.

The invention belongs to the field of preparation of macromolecular composite materials and particularly relates to an all-weather persistent antistatic master batch capable of being subjected to thermoplastic processing and an antistatic composite material. The antistatic master batch is prepared by forming of a low-dissociation-energy compounding agent, a processing auxiliary agent and thermoplastic macromolecular resin containing polar groups through macromolecular thermoplastic processing equipment at the temperature of 25-300 DEG C; and the mass ratio of the compounding agent to the thermoplastic macromolecular resin is equal to (1:10)-(1:50). The invention also discloses the antistatic composite material which is obtained after the persistent antistatic master batch and a macromolecular base material are formed through the thermoplastic processing equipment. The antistatic composite material has the characteristics that: 1. the antistatic composite material has light color and dyeability; 2. The master batch of the antistatic composite material and the compounding agent are wider in selection range, low in cost and easy to obtain, and the production process is simple, safe and non-hazardous; and 3. the influence of the ambient environment on the antistatic performance of the antistatic composite material is less, and the antistatic performance is persistent.

The invention relates to an apparatus and a method for depositing synthetic fibers to form a non-woven web, in which method the synthetic fibers are guided in the form of a blowing stream through a drawing unit for being deposited on a deposit belt. For this purpose, inside the guidance distance between a blast opening of the drawing unit and the deposit belt, several guidance means are arranged,which form a guidance channel above the deposit belt, wherein the guidance means form a channel opening of the guidance channel at a distance from the blast opening of the drawing unit. In order to achieve constant strength in the deposition of the fiber strands in the non- woven web, the distance between the outlet of the drawing unit and the channel opening of the guidance channel is larger than half the guidance distance according to the invention, wherein the guidance width of an open space formed between the outlet of the drawing unit and the channel opening of the guidance channel is larger than that of the guidance channel.

The invention provides an airport special vehicle vehicle-mounted device for ground airplane automatic monitoring. The device comprises an antenna module and a control-display module. The device is easy to be mounted on airport special vehicles. In addition, the vehicle-mounted device has advantages such as high cost performance, convenient operation, accurate auto-monitoring, and being less vulnerable to surrounding environment influence so that the device is quite suitable for on-site monitoring. By means of the device, visible and dynamic information of all ground airplane safety areas within a current airport can be provided for airport special vehicle drivers so that the case that airport special vehicles enter ground airplane safety areas by mistake under particular environment conditions (low visibility weather situations such as being at night, heavy fog, haze, and rainy days) and artificial factors (such as careless and blunt drivers with low concentration) is avoided and therefore the problems such as serious dangers(such as collisions, gas shocks and damages) and personal injury to the airport special vehicle drivers, delayed flights, and economic losses are avoided.

The invention provides a rotary endoscope fixture suitable for an end of a mechanical hand and an inner hole image acquisition method. The rotary endoscope fixture includes a rotating device and an image acquisition device. The rotating device includes a mechanical switching flange (2), a flange supporting frame (3), a stepping motor (4), a rotating platform (5), a rotating shaft (6), a bearing seat (7), a driven synchronous pulley (8), a driving synchronous pulley (9), and a flange shaft bracket (11). The image acquisition device includes a camera fixing block (12), an industrial camera (13)and an endoscope (14). The rotary endoscope fixture is simple and compact in structure, safe and reliable, acquires complete inner wall image information of a small-diameter deep blind hole in a workpiece by using a translation function of the end of the mechanical hand and a rotation function provided by the fixture, can directly acquire the inner wall information of the small-diameter lightly deep blind hole of the workpiece on a streamline, is convenient and fast in detection, is less affected by surrounding environment, and improves the detection efficiency and the detection accuracy.

The invention belongs to the field of wireless communication technology, and specifically relates to a student learning behavior acquisition and analysis system and a method thereof. The system comprises an external computer and a learning behavioral data real-time automatic recording device connected therewith. The learning data real-time automatic recording apparatus is capable of collecting the acceleration information of human bodies and transmitting the information to the computer for analysis; The learning behavioral real-time automatic recording device consists of an action acquisition unit, a clock unit, a memory unit, a communication unit, and an intelligent analysis and processing unit. The intelligent analysis and processing unit is respectively connected to the action acquisition unit, the memory unit, the clock unit and the communication unit through input and output ports, and is used for coordinating the action between among the above four units. Therefore, the system helps a user to avoid inconvenience and discomfort caused by wearing acquisition apparatuses on many parts of the body. Furthermore, by analyzing students' personality and learning behavior habits, this system can provide correct guidance for students' healthy development to avoid students' imbalanced development on subjects.

The invention discloses a method for detecting the strength of the magnetic blowing sensitive magnetic induction intensity of steel plate welding. The method comprises the following steps that a steelplate is machined to a proper size; magnetizing treatment is carried out on the steel plate; a plurality of Nth isomagnetic lines are drawn taken the gap along a Nth magnetic field as the interval onthe surface of the magnetized steel plate; welding is performed along the order of the magnetic fields from strong to weak and along along the multiple Nth isomagnetic lines, the magnetic blowing condition during the welding is observed, and then the magnetic blowing sensitive magnetic induction intensity is determined; and a metallographic sample is extracted from a weld joint of the magnetic blowing sensitive magnetic induction intensity determined in the above steps, and defect detection is carried out on the metallographic sample to determine the magnetic blowing sensitive magnetic induction intensity. According to the method, the magnetic blowing sensitive magnetic induction intensity generated by the residual magnetism of the steel plate can be simply and effectively found, the residual magnetism of the steel plate is controlled to be in the sensitive magnetic induction intensity or below before the welding, the phenomenon of magnetic blowing in the welding process is avoided, the welding quality of the steel plate is guaranteed, and excessive demagnetization is not needed and the waste of manpower and financial resources is caused.