Mechanism in Using Commercial High Efficient Zeolite-Base Greenfeed Slow Release Fertilizers

Fertilizer issues such as overuse, leaching and soil degradation are becoming severe?in?worldwide plantation areas. To secure current food production, prevention measures on these issues are relatively limited on agricultural production areas. Slow release fertilizer is prevailing over past years due to its significant effects on prevention of fertilizer leaching and less harm to soil and underground water. We presented here the mechanisms of a novel zeolite-based slow release fertilizer including its properties as reservoirs of nutrients, pH balancer and also water retainer in soil. By providing sufficient nutrients to soil, this fertilizer has commercially proven to give better growing environment to grower as well as labor saving and cost saving.

Structural optimization design of a bolster based on a simulation-driven design

A simulation-driven design method which uses multiple optimization methods can effectively promote innovative structural design tion analysis can enormously improve the efficiency of modelling and solving.This study establishes a general workflow of structural and reduce the product development cycle.Meanwhile,the sub-model technology which has more detailed simulation and optimizaoptimization for a stainless-steel metro bolster by combining the simulation-driven design method and sub-model technology.In the sub-model definition phase,the end underframe sub-model which contains the bolster is obtained based on the whole car body finite element(FE)model,and the effectiveness of the end underframe sub-model is also proved.In the conceptual design phase,the is determined according to manufacturing processes and design experiences.In the detailed design phase,the thickness of each topology path inside the bolster is obtained by the topology method and the optimized structure of the inner ribs inside the bolster part of the bolster is determined by size optimization.The simulation analyses indicate that the requirements of static strength and can be decreased by 17.79% compared with the original bolster structure,which means that not only the lightweight design goal fatigue strength are fulfilled by the optimized bolster structure.Besides,the weight can be reduced by 11.18% and the weld length is achicved.but also the welding auantity and manufacturing difficulty are geatly reduced.The results show the effectiveness of the simulation-driven design method based on the sub-model technology in the structural optimization for key parts of rail transit vehicles.

Biomechanical Study of the Fixation Strength of Anteromedial Plating for Humeral Shaft Fractures

Background： Open reduction and internal fixation with plate and screws are the gold standard for the surgical treatment of humeral shaft fractures, this study was to compare the mechanical properties ofanteromedial, anterolateral, and posterior plating for humeral shaft fractures. Methods： A distal third humeral shaft fracture model was constructed using fourth-generation sawbones （#3404, composite bone）. A total of 24 sawbones with a distal third humeral shaft fracture was randomly divided into three Groups： A, B, and C （n = 8 in each group） for anteromedial, anterolateral, and posterior plating, respectively. All sawbones were subjected to horizontal torsional fatigue tests, horizontal torsional and axial compressive fatigue tests, four-point bending fatigue tests in anteroposterior （AP） and mediolateral （ML） directions and horizontal torsional destructive tests. Results： In the horizontal torsional fatigue tests, the mean torsional angle amplitude in Groups A, B, and C were 6.12°, 6.53°, and 6.81°. In horizontal torsional and axial compressive fatigue tests, the mean torsional angle amplitude in Groups A, B, and C were 5.66°, 5.67°, and 6.36°. The mean plate displacement amplitude was 0.05 mm, 0.08 mm, and 0.10 mm. Group A was smaller than Group C （P 〈 0.05）. In AP four-point bending fatigue tests, the mean plate displacement amplitude was 0.16 ram, 0.13 ram, and 0.20 mm. Group B was smaller than Group C （P 〈 0.05）. In ML lbur-point bending fatigue tests, the mean plate displacement amplitude were 0.16 mm, 0.19 ram, and 0.17 ram. In horizontal torsional destructive tests, the mean torsional rigidity in Groups A, B, and C was 0.82, 0.75, and 0.76 N·m/deg. The yielding torsional angle was 24.50°, 25.70°, and 23.86°. The mean yielding torque was 18.46, 18.05. and 16.83 N·m, respectively. Conclusions： Anteromedial plating was superior to anterolateral or posterior plating in all mechanical tests except in AP four-point bending fatigue tests compared to the anterolateral plating group. We can suggest that anteromedial plating is a clinically safe and effective way for humeral shaft fractures.