4results about How to "Achieving Sensitive Detection" patented technology

The application discloses a kind of SPWM control's wireless charging system metal foreign matter detection device and method, including wireless power transmitting unit, wireless power receiving unit, metal foreign matter detection unit and control unit, the wireless power transmitting unit includes the SPWM modulation circuit, inverter circuit and transmitting coil connected in sequence, the metal foreign matter detection unit includes detection coil group, detection module connected in sequence, the detection coil group is laid on transmitting coil;The detection module includes parallel resonance circuit, high-pass filter circuit and differential amplifier circuit connected in sequence;The detection coil of the application can improve the detection sensitivity of small metal foreign matter.

The invention belongs to the technical field of biology, and particularly relates to a promoter responding to pentanediamine, a pentanediamine biosensor and application of the pentanediamine biosensor. The original PpyrF promoter can respond to the concentration of pentamethylene diamine and regulate and control the expression of report protein GFP, the promoter PpyrF-D40 or PpyrF-F5 is obtained by truncation or mutation optimization of the promoter PpyrF, and the dynamic range and sensitivity of the pentamethylene diamine biosensor are improved. The pentane diamine biosensor further constructed on the basis of the promoter PpyrF-D40 or PpyrF-F5 has no responsiveness to a pentane diamine synthesis precursor lysine, so that the biosensor has good specificity when being applied to screening of pentane diamine production strains. The fluorescence intensity value of the pentane diamine biosensor obtained through screening shows an excellent linear response relationship with the concentration of pentane diamine, and the pentane diamine biosensor can be used for efficiently breeding a pentane diamine high-yield strain by being combined with a high-throughput screening system and the like, and has the advantages of high detection efficiency, high sensitivity and the like.

The utility model relates to the technical field of lifts, in particular to a bidirectional mechanical trigger type lift car channel safety detection construction lift which comprises a lift car and a guide rail frame and further comprises an ascending channel detection assembly arranged at the top of the lift car and a descending channel detection assembly arranged at the bottom of the lift car. In the ascending process of the lift car, the ascending channel detection assembly touches a foreign matter, the upper portion is pressed, the first limiting switch is triggered, the guide rail frame stops driving the lift car to ascend, and the lift car returns to the initial position after pressure is removed; in the descending process of the lift car, the descending channel detection assembly touches a foreign matter, the lower portion is pressed, the second limiting switch is triggered, the guide rail frame stops driving the lift car to descend, and the lift car returns to the initial position after pressure is removed. Through a bidirectional mechanical trigger structure and an elastic reset design, the device detects foreign matters in an upper channel and a lower channel of the lift car in real time, timely responds and automatically resets, and ensures safe and reliable operation of the construction lift.

This invention provides a method for chiral recognition of phenylalanine, comprising the following steps: (1) preparing a ReSe2 film using NH4ReO4, NaCl, and selenium powder; (2) preparing gold nanoparticles using HAuCl4, NaBH4, and CTAB and AA at different concentration ratios, and inducing the formation of gold nanoparticles with different chiralities by adding cysteine ​​solutions; (3) dropping the prepared gold nanoparticle colloids with different chiralities onto the above ReSe2 film, and after complete air drying, dropping in a concentration range of 10 ‑3 -10 ‑7 (4) Using a fully automated laser confocal micro Raman spectrometer, Au-ReSe2 substrate materials loaded with phenylalanine of different chiralities were tested. This invention can achieve sensitive detection at a specific deflection angle, and at the same time, through the interaction between the enantiomer and the specific chiral substance, it exhibits a certain difference, which not only enhances the Raman signal, but also achieves good detection range for low concentrations of Phe (10 mol / L). ‑3 -10 ‑7 It has the advantages of strong molecular signal and wide detection range, with chiral recognition capability of mol / L.