The effect of the concentration of poly(3-hexylthiophene) (P3HT) on the electrical characteristics of diode rectifiable devices fabricated utilizing the P3HT was investigated. Atomic force microscopy images showed that the root-mean-square surface roughness of the P3HT thin films decreased with decreasing P3HT concentration. The current-voltage (I-V) characteristics of the Au/P3HT layer/indium-tin-oxide-coated glass devices showed resistance switchability. The I-V characteristics of the devices showed that the ON current at the same voltage decreased with increasing concentration and that the operating voltage of the device with a larger P3HT concentration was larger than that of the device with a smaller P3HT concentration. The diode rectifiable mode of the devices transformed from the Ohmic into the space-charge-limited current modes with increasing applied voltage.

In our country, the double track system management of land ownership and land use rights has caused the separation between urban and rural construction in land market. The collective non-agricultural construction land entering into market for transfer is inevitable for the construction of socialist market economy. But the current construction of land market is still in a state of separation in the most parts of China. Obviously, the allocation of land resources is inefficient in this state. The paper introduces emphatically the current land use situation of urban and rural construction in China from the theoretical research, the main body of urban and rural market, and the system of foundation.

The scope of expropriation compensation is one basic element of the expropriation compensation system, and whether it is correct is a main measure for protecting the lost-land farmers' interests. The compensation scope of farmland expropriation in our country has some loopholes at present, needing to be perfected from different aspects.

The ecological restoration of mining wasteland has been highly concerned about the world. Consequences of mining wasteland without governance has brought economic development and human survival posed a serious threat, so the ecological restoration of abandoned mining area has been imperative. This paper summarizes the research status and development process of ecological restoration and abroad, as well as some of the issues raised ecological restoration work currently exists.