ABSTRACT
A novel method based on cross sensitivity of cataluminescence (CTL) generated on the surface of a nanometer composite oxide was proposed for simultaneous determination of benzene and trimethylamine (TMA) in air. A variety of nanometer composite oxides based on Y2 O3 that showed catalytic activity to many gas molecules were synthesized. For the fabrication of the detector, nanometer composite oxide was directly coated on the ceramic rod to form a 0. 1-0. 15 mm thick layer. The ceramic rod with nanometer composite oxide was inserted into a quartz tube with an inner diameter of 10 mm. The temperature of nanometer composite oxide was controlled by the digital heater. When gas samples passed through the nanometer composite oxide in the quartz tube by the air flow, the CTL was generated during the catalytic oxidation on the surface of the nanometer composite oxide. The CTL signals were respectively recorded by two ultra weak chemiluminescence analyzers. The CTL intensity and selectivity for the determination of benzene and TMA on nano- Zr3 Y2 O9 which was characterized by TEM were bigger and better than those on other nanosized composite oxides. The optimum experimental conditions were tested. Selective determination was achieved at a wavelength of 440 nm for benzene and 540 nm for TMA. The surface temperature of the nanometer materials was about 313 ℃. The flow rate of air carrier was about 140 mL/ min. The limit of detection of this method was 0. 30 mg / m3 for benzene at 440 nm and 0. 70 mg / m3 for TMA at 540 nm. The linear range of CTL intensity versus concentration of benzene at 440 nm was 0. 8-105. 0 mg / m3 , benzene at 540 nm was 3. 0-130. 0 mg / m3 , TMA at 440 nm was 2. 5-232. 0 mg / m3 and TMA at 540 nm was 1. 2-156. 0 mg / m3 . The recovery of 5 testing standard samples by this method was 96. 8% -102. 3% for benzene and 97. 6% -103. 4%for TMA. Common coexistence matters, such as formaldehyde, ethanol, acetone, ammonia, sulfur dioxide and carbon dioxide, did not disturb the determination. The relative standard deviation (RSD) of CTL signals of a continuous 200 h detection of gas mixture of 50 mg / m3 benzene and 50 mg / m3 TMA was 2. 0% , which demonstrated the longevity and steady performance of nano-Zr3 Y2 O9 to benzene and TMA under this experimental conditions.
ABSTRACT
Objective To evaluate the reliability and validity of the Chinese-version Successful Aging Inventory (C-SAI).Methods The C-SAI was translated according to the Brislin translation model,and its reliability and validity was tested in 181 old adults.Results The content validity index for the scale (S-CVI/Ave) was 0.975.Five factors were extracted by principal components analysis which contributed 58.035％ to the variance.The Cronbach α and split-half reliability was respectively 0.832 and 0.871 for the total scale.Conclusions The C-SAI has good psychometric quality and can be used as a measurement tool for the successful aging.
ABSTRACT
Objective To investigate the current status and influencing factors of stethoscope cleaning and disinfection of medical staff in a tertiary hospital.Methods With simple random sampling,168 medical staff of a tertiary hospital were recruited and surveyed using a self-designed questionnaire.Results 4.88％ of the respondents never cleaned or disinfected stethoscopes,73.17％ of them used alcohol cotton to wipe stethoscopes.After cleaning or disinfecting stethoscopes,83.54％ used natural drying method.Only 33.53％ respondents stored stethoscopes in clean bags or containers while not using them.The mean of respondents' scores of stethoscope cleaning and disinfection was (20.42±3.07)points.There were significant differences in scores of stethoscope cleaning and disinfection between different occupations.However,there were no significant differences among different age groups or different departments.Conclusions The current status of stethoscope cleaning and disinfection of medical staff is not satisfactory.It is imperative for medical staff to improve the drying and storage method and promote their compliance with stethoscope cleaning and disinfection.Appropriate interventions should be taken aiming at the influencing factors of stethoscope cleaning and disinfection.
ABSTRACT
Objective To evaluate the clinic effect of two kinds of interventional intracavitary closure combined with deligation of varicose veins of lower extremity. Methods Seventy-five sick legs of 68 cases,23 sick legs of 21 cases accepted interventional intracavitary closure combined with high deligation, while 52 sick legs of 47 cases accepted interventional catheter electric coagulation combined with high deligation. Results The average hospitalization time was(2.7±1.4)days, lyins in bed time was 6 hours,12 sick legs(16.0%)suffered superficial skin mild numbness. The follow-up time was(7.3±3.0)months, all the varicose veins were occluded by color Doppler and no local recurrence was found. Conclusion Interventional intracavitary closure is a kind of safe, convenient and effective therapy to varicose veins of lower extremity.