Optical fiber grating temperature and pressure sensor based on diaphragm with temperature compensation is described.Elastic diaphragm acts as pressure sensing element,axial displacement occurs under pressure and compress pressure sensing grating to realize pressure sensing.Temperature compensation and active correction by add another temperature grating are adopted simultaneously to eliminate the thermal errors for the pressure grating.Besides,the temperature grating also is used for measuring temperature.Pressure and temperature characteristics of the sensor are measured.The experimental result shows that pressure sensitivity is 528 pm/MPa and temperature sensitivity is 8 pm/℃.

Objective To establish a rapid method for semiquantitative determination of zinc in human urine by visual colorimetry.Methods In the presence of surfactant,zinc reacts with thiocyanate and crystal violet to form a ternary ion-association complex,which can show different colors with the concentration change.Results This method was compared with routine pyridylazo naphthol method(PAN) by testing 36 urine samples and the coincidence rate was 97.22%.Conclusion The method is simple,rapid,accurate and intuitive,which can be used for semiquantitative determination of zinc content in urine.

The Ce-TiO2/diatomite photocatalytic materials were prepared by low-temperature combustion synthesis(LCS) method,which were characterized by XRD and SEM.The optimized photocatalytic preparation and degradation conditions of the supported photocatalytic materials were studied and determined,which selected Rhodamine B solution as the target pollutants.The results showed that the optimized calcination temperature was 600 ℃ and the optimized amount of doped Ce was 0.2%.The prepared samples were composed of anatase and rutile mixed polymorphs,and the anatase accounted for the major part.The optimized photocatalytic degradation conditions were Rhodamine B solution with initial concentration of 10 mg/L,the amount of catalyst of 1.0 g/L and the solution pH of 9.The degradation rate of the composite photocatalyst materials after deactivation and regeneration was 93%,and can be used repeatedly.Its photocatalytic performance was much better than that of the pure TiO2 photocatalytic material.