Objective To design a circuitry for the indication of the remaining capacity of battery.The circuitry can remind the user of charging in time for normal operation of instruments and prevention of early invalidation due to the over-discharge of battery.Methods The circuitry was designed totally based on hardware which used general electronic components.Results The circuitry functions was dependable and reliable with accurate indication in radar based non-contact life detecting devices.Conclusion The whole design is simple and needs no programming technology.The PCB is small,and the debugging is simple.Moreover,it can be applied to indication of various capacity and voltage.

The definition, principle, characteristics of micropower Ultra-Wide-Band (UWB) radar are described and discussed in this paper. The human subject is experimented using the UWB radar developed by our team. The experimental results show that UWB radar is able to detect the life signals of the human subject such as respiration and heartbeat without any sensor and electrode touching the subject.The radar can be applied to non-invasive detection of life signals.

This article refers to constructing process of non-contact life parameter detecting system by twin-antenna. The technology above proves feasible through pilot study of restraining environmental interference by donkey antenna. A new method for solving the problem of environmental interference of non-contact life parameter detecting system is also presented.

This paper introduces the design of a linear photoelectric isolating amplifier circuit, and analyzes the errors of the circuit in experiment. The problem of narrow dynamic range in low power isolating circuit is solved.

This article refers to design of signal preprocessing software in the non-contact life parameters detection system,gives details about the composing of software and actualization method of every part,and lists correlative parameters and results.The experiments show that the parameters of this software accord with designed requirements.The software can make high quality signals available for display and process.

Objective To solve the signal interference problem by simulation algorithm when clutter signal can bring interference to radar life detecting system and reduce accuracy of its detecting. Methods According to some theory, automatic cancellation model was built up in computer with Matlab software. Results Simulation experiment shows that the cancellation composed signal So(t) is not correlative with the time and precision of auto-counteract but the amplitude and phase of clutter signal. Conclusion The results of the experiment have instructive significance about design of auto-counteract circuit.

This paper introduces the means and characteristics of signal acquisition of the non-contact life parameters detection system as well as the design of preprocessor circuit.The results show that the preprocessor is designed reasonably,which can provide the computer with high quality signals.

In order to check out the cortical EEG signals of conscious and/or anesthetized rats, a 16-channel analog signals preprocessor is developed. This preprocessor can amplify and filter the primal EEG signals to transform them into ones with proper altitudes and high SNRs, and then they will be sent to the A.D converter. Some measures are taken in view of the signals' low frequencies, low SNRs and background with strong interference. When high gain made, such performances of the circuit are emphasized as low noise, low offset voltage, low gain error and heightened CMRR.

To establish an HPLC mehod for the analysis of pharmacokinetics of salvianolic acid B in rats. METHODS: The biological samples were extracted with acetic ether. The chromatographic conditions were as follows: Hypersil ODS column (200 mm×4.6 mm, 5μm) was used. The mobile phase was acetonitrile-water(with Ammoniom Acetate 0.25 mol/L) was set at 328 nm. RESULTS: Salvianolic acid B was injected intravenously at doses of 1.6, 3.2, 6.4 mg/kg. The terminal elimination half-life(t1/2) of α phase and β phase was (3.1±0.1) min and (31.5±3.2) min. The extents of excrement,urine and biliary excretion of salvianolic acid B were 1.43%±0.90%, 0.77%±1.01% and 8.82%±4.11%. The tissue concentration of salvianolic acid B was as followed in order: Cheart>Cliver>Clung>Cintestine>Ckidney>Cspleen>Cstomach. The plasma protein binding rate of salvianolic acid B in human plasma and in rat was similar(89.2%±1.8%,92.5%±1.5%). CONCLUSION: The method is accurate, stable and reliable, and can be used for the investigation of salvianolic acid B in pharmacokinetics research. Salvianolic acid B eliminates fast and it shows a high plasma protein binding rate, the mainly excretion way of salvianolic acid B is from biliary.

The measurement methods of respiration can be mainly divided into contact and non-contact.Contact detection methods include volumetric flowmeter,velocity flowmeter,temperature detection,displacement detection,impedance detection,wearable technology and sleep mattress,etc.Although these methods are noninvasive and mature,they all require electrodes or sensors to touch the body of human subjects,which limit the users’ freedom and are not suitable for severely bumed patients and newborns.In non-contact monitoring,the respiration is measured by using the media such as electromagnetic waves,optical media,etc,and without any electrodes or sensors to touch the body whiles the human subject keeping natural status.Non-contact detection method using infrared and biological radar has been a research focus both at home and abroad,which can be used for clinical,community and family care.