47results about How to "Reliable detection means" patented technology

A sealing protection device and method for vacuum negative pressure static test piles. Bottom plate, detachable ring, screw anchor pile, static load meter, air pressure monitor and vacuum pump, a round hole is reserved in the center of the rigid bottom plate and set on the upper part of the test pile, and the detachable ring is assembled at the round hole. Bolt connection holes are reserved on the outer edge of the rigid base plate, and the rigid base plate is fixed on the foundation surface through screw anchor piles; the main beam is placed on the strip concrete pier; the rigid platform and skirt are placed on the main beam and connected with the rigid base plate; The soft sealing layer covers the outer layer of the rigid platform and the skirt to form a closed space. Using the device of the invention to detect the bearing capacity of pile foundations does not require external heavy loads, saves a large number of external load purchases, transportation, hoisting and labor costs, can be reused, and further saves engineering economy.

The invention discloses an automobile safety warning system. The system comprises a pressure sensor used for detecting a riding state of a driver and passengers, a detection switch which is arranged in a lock catch of a safety belt and used for detecting an insertion state of a spring bolt, a warning device used for sending out a warning prompt, and a warning controller used for receiving a detection signal and sending the warning information according to the detection signal, the pressure sensor, the detection switch and the warning device are all electrically connected with the warning controller, the device further comprises a winder assembly, the winder assembly comprises a shell and a rotating shaft rotatably installed on the shell, a woven tape is wound on the rotating shaft, a detection feature object used for being detected is fixedly attached to the woven tape, the detection feature object is located in the middle of the woven tape, and a switch sensing device used for detecting whether the detection feature object passes or not is further arranged at an outlet of the shell and electrically connected with the warning controller. The device has advantages of being ingeniousin structural design, accurate and reliable in detection means, good in warning effect, beneficial to improving driving safety and the like.

The invention relates to a method for determining chloramphenicol in freshwater pond sediment by applying a liquid chromatograph / mass spectrometer. The method comprises the following steps of firstly, collecting a sediment sample of an aquaculture pond; secondly, extracting the sample; thirdly, purifying with n-hexane; fourthly, extracting water saturated ethyl acetate solution; fifthly, blowing extracting solution to be dry with nitrogen gas, and dissolving the dry extracting solution with acetonitrile-water (5+95) to obtain standby solution; sixthly, performing solid phase extraction column for eluting; seventhly, extracting the water saturated ethyl acetate solution, and blowing dry with the nitrogen gas; eightly, dissolving methanol water (50+50), whirling, filtering by a microfiltration membrane of 0.22[mu]m and determining by using the liquid chromatograph / mass spectrometer. According to the method disclosed by the invention, by pretreatment for the freshwater pond sediment, a matrix disturbing substance is removed, the sensitivity is improved, and the pretreatment process is optimized; in addition, the sample is prevented from being derivaed, so that the operation step is simplified; a reliable detection means can be provided for checking a pollution source and evaluating the influence of the ecological environment on healthy breeding.