β-tricalcium phosphate (β-TCP) added with certain amounts of β-calcium pyrophosphate (β-CPP) was prepared. Degradation behavior of β-TCP/β-CPP ceramic was tested by soaking in Tris solution for 20d. The morphologies of composites before and after degradation were observed by SEM. The weight loss was tested after soaking in immersion solution. The results showed that the β-TCP/β-CPP ceramic had great potential as a biodegradable bone substitute.

In this paper, the energy consumption of the truck crane lifting load sensing (LS) hydraulic loop is analyzed. AMESim is applied to model it, based on the design of a 70t truck crane lifting loop. And then the efficiency of it is simulated, comparing with the traditional truck crane lifting hydraulic loop. The simulation results clarify that the efficiency of the LS lifting hydraulic loop is obviously improved compared with the efficiency of the traditional one. Its efficiency has nothing to do with the load speed and is only related with the load. The results are useful to the design of large-tonnage truck crane lifting hydraulic loop.

In this paper, by defining and associating the boom structure parameter characteristic of truck crane, we build a parameterized automatic analysis system of truck crane boom, based on the VB platform with the ANSYS APDL language. In the system, the basic parameters of the crane structural finite element analysis can be obtained by human-computer exchange, achieving the finite element automatic modeling and analysis of boom structure under the driving of the parameters. Engineering examples show that the system is reliable and accurate results.

Gypsum powders and calcium phosphate/gypsum powders were synthesized by wet method. The influences of the pH and temperature on the morphology of the gypsum crystal were studied by light microscopy. The effects of the initial calcium/phosphorus molar ratio and the pH of the solution on the microstructure and phase composition of the calcium phosphate/gypsum composite powders were studied by scanning electron microscopy and X-ray diffractometry. The results show that both temperature and pH value had influence on the crystal shape of gypsum and the pH value was the predominant parameter for the particle shape and phase composition of the composite powders.