PubMed | WenzhouMedicalUniversity, HarbinMedicalUniversity, Peking Union Medical College, Harbin Medical University and 2 more.
Type: Journal Article | Journal: PloS one | Year: 2015
To explore the relationship between family environment and depressive symptoms and to evaluate the influence of hard and soft family environmental factors on depression levels in a large sample of university students in China.A multi-stage stratified sampling procedure was used to select 6,000 participants. The response rate was 88.8%, with 5,329 students completing the Beck Depression Inventory (BDI) and the Family Environment Scale Chinese Version (FES-CV), which was adapted for the Chinese population. Differences between the groups were tested for significance by the Students t-test; ANOVA was used to test continuous variables. The relationship between soft family environmental factors and BDI were tested by Pearson correlation analysis. Hierarchical linear regression analysis was conducted to model the effects of hard environmental factors and soft environmental factors on depression in university students.A total of 11.8% of students scored above the threshold of moderate depression (BDI14). Hard family environmental factors such as parent relationship, family economic status, level of parental literacy and non-intact family structure were associated with depressive symptoms. The soft family environmental factors--conflict and control--were positively associated with depression, while cohesion was negatively related to depressive symptom after controlling for other important associates of depression. Hierarchical regression analysis indicated that the soft family environment correlates more strongly with depression than the hard family environment.Soft family environmental factors--especially cohesion, conflict and control--appeared to play an important role in the occurrence of depressive symptoms. These findings underline the significance of the family environment as a source of risk factors for depression among university students in China and suggest that family-based interventions and improvement are very important to reduce depression among university students.
Chen X.,CentralSouthUniversity |
Gao G.,CentralSouthUniversity |
Dong H.,CentralSouthUniversity |
Thin-Walled Structures | Year: 2016
Based on the splitting and bending of a steel plate, a new type of energy absorption structure is presented in the paper. The absorber consists of a steel plate, die, and support tool. During collision, the steel plate is split and bent by the die. Using this type of absorber, energy absorption occurs through the splitting of the steel plate, elastic-plastic bending, and friction between the steel plate and the die. Two kinds of steel plates with different thicknesses are constructed and tested. The experimental results show that the deformation of the steel plates is stable. The grooves on the end of the steel plate effectively eliminate the initial peak of the force. This combined method performs energy absorption effectively. The energy absorption responses of the structure are also analysed using the finite element method. By comparison with the experimental results, the numerical results are validated. © 2015 Elsevier Ltd. All rights reserved.
Peng X.,CentralSouthUniversity |
Peng X.,HunanFirstNormalUniversity |
Yan J.,CentralSouthUniversity |
Chinese Journal of Sensors and Actuators | Year: 2010
This paper describes the design of a high-temperature field measuring instrumentation, which is composed of an optical lens, a color CCD camera, an image grabbing card, a computer and associated measuring software. Based on the two-color thermometry, the temperature distribution of the measured obj'ect can be calculated and then displayed on the screen. A method of automatically adjusting the amount of light is used to expand temperature measuring range of CCD, and blackbody furnace calibration experiments are adopted to calibrate the measurement errors caused by the non-ideal spectrum response character of CCD image sensor. Finally, an attenuation equalizer of radiation is built to compensate measuring temperature errors caused by smog interference. By testing on the industrial field, the maximum absolute error is 13. 6 K, and the maximum relative error is 1.42% , the average computing time of each piece of radiation image is about 0. 127 seconds. The test indicates that the measuring instrumentation meets the high-temperature detecting requirements of industrial production due to its high accuracy and reliability.