Objective To analyze the direct and indirect effects of influencing factors on suicide ideation among college students based on the structural equation model. Methods 1505 college students were investigated with ASLEC, Simplified Coping Style Questionnaire, SSRS, QSA and BDI. Results Incidence rate of college students' suicidal ideations during the past year was 6.67%. The goodness of fit for the structural equation model was satisfactory and 3 major indices( x2/df = 2.23, GFI = 0. 982, RMSEA = 0. 029 ) had met corresponding requirements. The depression was directly influencing factor on suicide ideation, while four factors including passive coping style, social support, positive coping style and suicide attitude, had indirect impacts. Negative life event not only directly affected suicide ideation, but also had indirect effects. According to the percentages of their contribution, the risk factors were ranked as follows:depression (41.08%), negativity life event (35.35%) and passive coping style (6.05%). Similarly, the top protective factor was: social support ( 11.94% ), followed by positive coping style (4.94%) and suicide attitude (0.63%). Conclusion Depression is an important risk factor of suicide,and has a direct impact. So, not only strengthen the mental health of college students, but also train students to face up the difficulties with a positive style, and make the college students get social supports sufficiently.

Sarcopenia, referred to as myopenia, is a systemic syndrome characterized by decreased muscle mass and muscle strength, and decline of motor function.The elderly are a high incidence group of myopenia.With the aging of the world's population becoming increasingly severe, the incidence rate of sarcopenia has also increased, which has brought a heavy burden to the elderly family and society, and has become an important social health problem for the elderly.At present, there are more and more researches on sarcopenia, but the pathogenic factors of sarcopenia are complex and diverse.The prevention and treatment of sarcopenia still need to be further explored and studied.The establishment of an ideal animal model is the key premise and basis for the related research of sarcopenia.In this paper, the different modeling methods, advantages and disadvantages as well as the scope of application of sarcopenia animal models are described, which can provide reference and help for the subsequent animal experimental research of sarcopenia.

Objective To investigate biomechanical characteristics of femoral neck fracture with different reduction qualities. Methods Three cases of Sawbones artificial femoral models were selected, and two cases of Pauwel III femoral neck fracture were modeled. Three cannulated screws were inserted into the models in the form of inverted triangle to fix the fracture. Two cases maintained different reduction qualities (defined as Model 1 and Model 2). In the 3 third case, no modeling operation was performed (defined as intact model). Then the strain gauges were respectively pasted on regions of interest of the 3 femoral models. Finally, the femur model was applied with the vertical load on mechanical testing machine. Results When the displacement of femoral head reached 4 mm, the average load of intact model, Model 1 and Model 2 was (236.30±5.35), (196.57±3.56), (69.50±2.95) N, showing significant differences. When the displacement of femoral head reached 5 mm, the average load of intact model, Model 1 and Model 2 was (276.7±3.40)，(232.93±2.64)，(80.83±4.54) N, showing significant differences. Conclusions The lower the reduction quality of the femoral neck fracture, the weaker the ability of the femur to bear stress, the higher the probability of nonunion, re-fracture and femoral head necrosis in the process of postoperative rehabilitation.