7results about How to "Accurate concentration" patented technology

The utility model relates to gas detection technical field, the utility model provides a kind of portable gas calibration device, can realize portable flow adjustable, gas species selectable, configuration accurate, simple operation and safe use. The utility model device can produce five kinds of standard gas in hydrogen in air, hydrogen in oxygen, hydrogen in nitrogen, oxygen in hydrogen and oxygen in nitrogen, when producing hydrogen in air, can not use standard gas cylinder, by extracting field air after pretreatment as carrier gas to carry out gas distribution;When producing other gas, only need to be equipped with a bottle of carrier gas standard gas. The utility model gas distribution principle is simple, concentration is accurate, greatly facilitates the calibration of on-site analyzer, realizes portable flow adjustable, gas species selectable, configuration accurate, simple operation.

This invention discloses a method for detecting hexavalent chromium in cement, belonging to the field of cement quality testing technology. The method includes: preparation of standard solution, preparation of colorimetric reagent, plotting of standard curve, cement sample processing, sample determination, and waste liquid treatment. This invention solves the problems of insufficient detection stability, non-standardized operation procedures, and poor environmental performance of existing technologies. It has the advantages of accurate detection, simple operation, and safety and environmental protection, and can be widely applied to cement production quality control and environmental testing scenarios.

This invention relates to a nuclear-targeted multimodal imaging diagnostic probe with BNCT therapeutic efficacy, its preparation, and its application, belonging to the fields of biomedicine and nuclear medicine technology. This boron drug contains... 10 Using acetylacetone difluoroborate as the parent nucleus, this invention endows the tumor with nuclear targeting ability by introducing N- or S-containing heterocyclic structures, while utilizing its conjugated structure to provide fluorescence / photoacoustic dual-modal imaging functionality. Based on this, the invention achieves three core functions: first, through fluorescence / photoacoustic dual-modal imaging, it enables the visual localization and real-time monitoring of tumor sites; second, by leveraging the binding of nuclear targeting groups to nuclear DNA / RNA, it... 10 B is precisely delivered into the nucleus, significantly improving the killing efficiency of BNCT; thirdly, thermal neutron irradiation is performed under imaging guidance, triggering... 10 The B(n,α)⁷Li nuclear fission reaction ultimately enables high-precision integrated diagnosis and treatment. This invention also discloses a method for preparing this probe, which has promising clinical application prospects.

The application belongs to the technical field of infrared laser radar, and provides a laser radar chip integration method for gas cloud imaging, which comprises the following steps: integrating a mid-infrared band intercascade laser and a mid-infrared detector on a same silicon substrate; when the integrated chip is packaged, a micro-mirror, a MEMS mirror and a transceiver chip are combined and packaged in a same module; the laser rear end transmits light to the micro-mirror, the micro-mirror moves forward and backward through a piezoelectric ceramic, the light emitted by the laser front end hits the MEMS mirror, the light emitted by the MEMS mirror is reflected after hitting the detected gas and is received by the detector; the application realizes the integration of emission, reception and spatial scanning, gives a gas distribution diagram of the whole space through scanning spectrum imaging, can provide accurate gas concentration at any position in the space, and can detect multiple gases simultaneously through spectrum tuning of a wide spectrum light source.

The application relates to a preparation method of a HOF ratio fluorescent sensor and application of the HOF ratio fluorescent sensor in ammonia gas detection in exhaled air of patients with liver and kidney diseases. The material can detect trace ammonia gas, the lower limit of ammonia gas detection is 0.7 ppm, two opposite fluorescent response signals can accurately quantitatively detect the concentration of ammonia gas in the exhaled air of patients with liver and kidney diseases, the ammonia gas concentration obtained through testing keeps a high positive correlation with the blood ammonia concentration, specifically, the exhaled air of patients with liver and kidney diseases is collected in an aluminum foil gas collecting bag, the collected gas is introduced into an aqueous solution containing a ratio fluorescent sensing material Pt2Cu4@HOF-101, and the aqueous solution is statically placed for a period of time to complete ammonia gas detection in the exhaled air of the patient and fluorescent color development, or the patient directly blows the gas into the aqueous solution of the fluorescent sensing material to complete ammonia gas detection. Non-invasive rapid detection of liver and kidney diseases can be effectively realized, and the HOF ratio fluorescent sensor is expected to replace traditional blood ammonia detection and be applied to the fields of clinical diagnosis and disease course monitoring of liver and kidney diseases.

A CAN bus urea quality sensor concentration correction system and method are disclosed. The CAN bus urea quality sensor concentration correction system includes a urea quality sensor body and a quality concentration probe disposed at the lower end of the urea quality sensor body. The quality concentration probe has a emitting surface and a reflective surface spaced apart from the emitting surface. The CAN signal interface of the urea quality sensor body is electrically connected to a USB-CAN analyzer via a CAN bus. The serial port of the USB-CAN analyzer is electrically connected to the serial port of a host computer. This invention corrects the distance between the emitting and reflective plates of the urea quality sensor through closed-loop compensation data fitting, making the urea concentration measured in a standard urea solution at room temperature more accurate. By integrating concentration measurement data under other temperature and concentration conditions through a large amount of experimental data, the measurement accuracy of the ultrasonic probe product is significantly improved. No additional components are required, and the correction speed is fast, exhibiting high correction accuracy and practicality.

The application discloses a summer cutting propagation method of white yew, and comprises the following steps: 1) cutting substrate preparation; 2) seedbed preparation; 3) spur preparation; 4) spur soaking; 5) cutting treatment; and 6) post-cutting management. According to the method, the optimal spur maturity, accurate rooting agent concentration and economic and efficient substrate formula suitable for high-temperature and high-humidity environment in summer are screened, so that the survival rate of white yew cutting is more than 96%, and a large number of fibrous roots can be induced within one month.