ABSTRACT
Objective To explore the mediating effects of college students＇ online social support on the relationship between online self-disclosure and internet altruistic behavior.Methods Using cluster random sampling,the self-disclosure questionnaire for Chinese undergraduates with their internet friend,the online social support scale of adolescence and the internet altruistic behavior scale of undergraduates were applied to 351 college students.Results The score of college students＇ online self-disclosure,online social support and internet altruistic behavior were respectively(2.22±0.45),(2.93±0.59) and (2.04±0.46).The college students＇ online self-disclosure,online social support and internet altruistic behavior were positively correlated with each other (P＜0.01).College students＇ online self-disclosure not only predicted internet altruistic behavior directly,but also predicted internet altruistic behavior indirectly through online social support.The direct effects and indirect effects were 0.200 and 0.265.The ratio of the mediating effect on the total effect was 57％.The fit index of mediation model was x2/df=2.87,RMSEA =0.07,CFI =0.94,TLI =0.93,GFI=0.92,IFI=0.94,NFI=0.91.Conclusion The college students＇ online self-disclosure not only affects the interuet altruistic behavior directly,but also can take the same effect on online social support indirectly.
ABSTRACT
Objective To study the effects of different dose 6 MV and 10 MV photons for classic conformal radiotherapy on cervical cancer patients with different height and weight,in order to provide guidance for clinical irradiation energy choosing for different patients.Methods Twenty-one recruited patients were divided into obese and non-obese group according to the body mass index (BMI).The 4-field classic conformal radiotherapy plans was designed and applied in both groups and the results were compared.Statistical analysis was carried out on the dosimetric parameters.Results The treatment plan of 10 MV photons could both reduce the maximum and minimum dose (Dmax and Dmin) of the target area PTV and increase the conformal and heterogeneity index (CI and HI),and change the median dose (D50) for non-obese patients,while it could not reduce the mean dose (Dmeen) for two groups.It was more effective in reducing Dmax and increasing HI for obese patients.The plan could also reduce the dose of organs at risk (OAR) near the PTV.Using 10 MV photons plan could more effectively reduce the low isodose volume of the patients and machine hops.Conclusions The 10 MV photons plan has many advantages in classic conformal radiotherapy for obese cervical cancer treatment.