[A Mattress System of Recognizing Sleep Postures Based on BCG Signal].

Sleep posture recognition is the core index of diagnosis and treatment of positional sleep apnea syndrome. In order to detect body postures noninvasively, we developed a portable approach for sleep posture recognition using BCG signals with their morphological difference. A type of piezo-electric polymer film sensor was applied to the mattress to acquire BCG, the discrete wavelet transform with cubic B-spline was used to extract characteristic parameters and a naive Bayes learning phase was adapted to predict body postures.

[Application of EDXRF in Detection of Impurity Elements in Anodic Oxide Layer of Surgical Implants].

This paper established a qualitative and semi-quantitative analysis detection method of the micro-arc oxidation titanium and titanium alloy layer of Na, Si, P, S and other impurity elements by X-ray fluorescence. At the same time, from the angle of technological process, we analyzed the impurity element types and sources, and verify the reliability of this method. The locking plates superficial layer contained P element, the average was 1.

Effect of alcohol stimulation on salivary pellicle formation on human tooth enamel surface and its lubricating performance.

This study was to investigate the salivary pellicle formation on the surface of human tooth enamel and its lubricating behavior under alcohol stimulation. Normal saliva and alcohol-stimulated saliva were collected from a young male volunteer after rinsing mouth with deionized water and different-concentration alcohol aqueous solution, respectively. Saliva-adsorption treatment was conducted in vitro on enamel surface to obtain salivary pellicle.

Preparative separation and purification of two highly polar alkaloids derived from Semen Strychni extracted with dichloromethane by high-speed countercurrent chromatography.

Brucine chloromethochloride and strychnine chloromethochloride, the two chloromethochloride derivatives formed during the extraction of Semen Strychni in which dichloromethane was used as the extracting solvent, were isolated and purified by high-speed countercurrent chromatography for the first time. The two-phase solvent system composed of chloroform/methanol/0.3 mol/L hydrochloric acid (4:3:2, v/v/v) was selected for separation.

An investigation and evaluation on species and characteristics of pathogenic microorganisms in Chinese local hospital settings.

There are currently great concerns about the level of bacterial contamination in hospitals, as well as resistance to antimicrobial agents. The species and characteristics of microbes in Chinese hospitals are closely related to healthcare safety and the prevention and control of infections. However, data on the exposure of patients to microbes in Chinese hospitals are limited.

[How to improve the accreditation validity of medical devices testing laboratory].

The safety and effectiveness of medical devices are directly related to human health. Therefore, how to improve the accreditation validity of medical devices testing laboratory has been the focus of attention from every corner of society. With respect to the characteristics of medical devices testing laboratory, this paper represented the existing issues during the accreditation and evaluation of testing laboratory, put forward some improvement suggestions on how to improve the validity of testing laboratory evaluation based on the practical experience.

[The classify of fractional photothermolysis laser].

According to the safety protection of laser, discusses the basis and method of classification were discussed the classify of fractional photothermolysis Laser was tested and analyzed.

[Medical device software requirements and evaluation].

This paper introduces the safety and effectiveness requirements of medical device software. And it discusses the methods on evaluating medical device software from two aspects, the design and development process of the software and software products.