Lu2Ti2O7octahedrons were synthesized by molten salt synthesis (MSS) through selecting appropriate source materials and controlling proper external conditions. The phase constituents and microstructure morphologies of as-product were characterized by X-ray powder diffraction, Energy Dispersive Spectrometer, Field Emission Scanning Electron Microscopy and High-resolution Transmission Electron Microscopy. According to the experimental results, the detailed microstructure and growth mechanism of Lu2Ti2O7octahedron have been analyzed. The presented results in this paper may benefit to a deeper understanding of the fundamental physical and chemical processes of MSS methods.

The article is research on the influence of urban lane occupied for the road traffic capacity. Under the condition that the density of urban traffic flow is big, and it‘s successional, we consider the quantity of vehicle is continuous. Through analyzing the dynamic changes of the road traffic capacity and its influencing factors after accidents, we can get reasonable suggestions of reducing the length of traffic jam. First we establish a flow-speed-density model to describe the dynamic changes of the road traffic capacity. Then we can compare the traffic flow to the electric current according to its continuity. So the upstream traffic flow and the traffic capacity of the accident cross section are equal to the charging current and the discharging current. And the vehicle queue is translated to the voltage of the charge-discharge capacitance. We can get the length of the vehicle queue by the formula of the capacitance voltage approximately. Finally the correction coefficient is introduced. In conclusion, the road traffic capacity is depended on the distance from the upstream intersection and the lane that the accident happened on and so on. Meanwhile, if we don’t solve the accident timely, the length will rise sharply. It will cause serious traffic jam. So we suggest relevant departments timely deal with the accident, evacuate the traffic, and prompt drivers to change lanes in advance.

In this paper, a study of freeway traffic rules, respectively, from the traffic flow and road safety performance provides a theoretical basis for the establishment of a more rational road rules. First, we set up an appraisal system of the traffic flow which describes the flow from the average speed, the traffic density, the overtaking rate. And we calculate them separately. Meanwhile, by fitting, we can obtain the relationship between the traffic flow and the overtaking ratio. Then, an evaluation system of the safety is established which is based on the IHSDM (the evaluation model for highway safety). We can use it to get the conclusion that when the difference between the speeds of running vehicles is greater, the corresponding accident rate is higher. And the rate has a direct response to the road safety performance. Also, we combine the overtaking model to explore the safety performance in different road rules. Finally, in the case of different traffic rules, we can get a comprehensive of the model.