Objective To improve the hardware of a medical radioisotope dose calibration system base on LabVIEW platform.Methods Hiish performance voltage-frequency-converter VFC32 was applied to realize hardware circuit design of medical radioisotope dose calibrator,and the function of the circuit wag analyzed.The output voltage signal from the calibrator ionization chamber was processed by the designed circuit.The output frequency signal from the circuit was obtained by USB-6009 DAQ and was then processed by virtual instrument designed using LabVIEW 8.0.Results Experimental data graphs indicated that the improved system had a better linearity in the low and medium frequency band.Conclusion The redesigned radioisotope dose calibrator has advantages in improving measuring accuracy,measuring range,feeble-minded detection limit and so on.

Objective: To investigate effects of different excipients and its compounds on extract granulating made by spray drying and to find the best compound of making granule. Methods: Taking difficulty of granulating; obtaining rate, granule dissolution rate, hygroscopicity as assessing index, evaluating effects of different excipients and its compounds on granulating and finding the best compound. Results: Different excipients and its compounds could significantly decrease the hygroscopicity of extract. Different compounds could sharply affect difficulty of granulating, obtaining rate and granule disdoultion while lightly affecting the hygroscopicity. Conclusion: When critical relative moisture is controlled under 65%, the following two compounds can be selected: (1) extract sucrose silion dioxide (500∶115∶25). (2) extract sucrose microcrystalline cellulosec silion dioxide.

Objective To study the relationship between social support and subjective well-being(SWB) of labor workers.Methods 1038 labor workers in Shenzhen were evaluated by subjective well-being scale for Chinese citizen (SWBS-CC), social support rating scale ( SSRS ).Results There was no significant difference in SWB between male and female( ( 63.51 ± 11.03 ) vs ( 63.22 ± 12.02 ), t = 0.389, P ＞ 0.05 ).The 30 ～ 49 age group's score was significantly higher than the 16 ～29 age group's( (62.80 ± 11.80) vs (64.54 ± 11.28), t=2.21, P ＜ 0.05 ).The married group's score was significantly higher than the unmarried group's ( (62.50 ± 12.18)vs (64.27 ± 10.80 ), t= 2.44, P ＜ 0.05 ).Social support was significant positively correlative with subjective well-being ( r=0.075 ～0.391, P＜0.05), except support availability was not correlative with both subscales.Subjective support, support availability and objective support were significantly positive predictions of SWB, meanwhile subjective support was the biggest( β =0.297).Conclusion Subjective well-being of the labor workers in Shenzhen have significant relationship with age and social support.To increase the emotional support for the labor workers could possibly help to improve their subjective well-being.

Objective To analyze the clinical characteristics and drug resistance of 57 patients with Salmonella infection, and to understand the sensitivity of Salmonella to commonly used antibiotics. Methods Clinical data of 57 Salmonella infection patients admitted in our hospital from January 2016 to February 2019 were collected. After hospitalization, routine examinations such as hematuria and stool were carried out, and fecal bacterial culture and drug sensitivity tests were performed. Results Among the 57 patients, the highest incidence of clinical symptoms was abdominal pain and diarrhea (57 cases, 100%), with an average of 7.46±2.03 times. The others were nausea and vomiting (45 cases, 78.95%), fever (43 cases, 75.44%), headache (34 cases, 59.65%), tenesmus (26 cases, 45.61%) and dehydration (25 cases, 43.86%). The results of stool routine examination showed that 51 cases (89.47%) were positive for fecal leukocytes and 45 cases (78.95%) were positive for fecal occult blood test. The results of urine routine test showed that 45 cases (78.95%) were positive for proteinuria and 38 cases (66.67%) for occult blood test. The results of blood routine examination showed that the average value of leukocyte count was (9.98±4.22)×10⁹/L, neutrophils accounted for 79%, and C-reactive protein was (60.15±32.48)mg/L. The results of drug sensitivity showed that the resistant strains to cephalosporins and quinolones accounted for a large proportion of the total strains. Conclusion The main symptoms of Salmonella infection in this area were abdominal pain and diarrhea. Fecal examination and routine urine examination were more valuable for diagnosis. The detection of resistance to quinolone and cephalosporin antibiotics should be strengthened to provide a basis for rational use of drugs.

Hand, foot, and mouth disease (HFMD) is a common childhood infectious disease caused by various enteroviruses. China has the most significant number of reported cases and deaths of HFMD over the globe. Understanding the epidemic laws of HFMD can provide a scientific basis for designing prevention and control measures. The dynamic transmission models focus on the transmission mechanism of infectious diseases. They can simulate the actual situation to study the epidemic rules of diseases by adding, deleting, and subdividing compartments. More researchers have paid attention to dynamic models because of their high flexibility. To carry out the dynamic model of the HFMD research more effectively, a comprehensive understanding of related research progress in this field is deeply needed. In this paper, based on various researchers' different research purposes of dynamic models, the research progress was classified and summarized, providing meaningful guidance for model construction methods and future research directions and references for dynamic modeling of other models of infectious diseases. It was found that most studies used the SIR dynamic model or its extended model (such as the SEIR model), and few studies contained a complex factor compartment. Some important epidemiological parameters (such as R0) were obtained by studying the HFMD cases in a specific region, simulating different intervention scenarios to evaluate the effect of measures, or revealing the future trend by model prediction. However, there is no dynamic model simultaneously considering age structure, population moving, seasonality and periodicity, and vaccination.