Abstract: A method and a system for measuring the pore structure of tight sandstone are provided. The method comprises the following steps: carrying out the desorption experiment of a core sample saturated by a specific gas containing isotope element to obtain the pressure of the specific gas and the total isotope ratio at each sampling moment; acquiring a single isotope ratio of each pore diameter at each sampling moment according to a physical model containing pore diameter parameter and the pressure of the specific gas at each sampling moment; and obtaining the proportion of a pore of each pore diameter in the core sample. The method and the system for measuring the pore structure of the tight sandstone provided by the disclosure can quickly obtain the pore distribution of the tight sandstone without damaging a sample.

Abstract: Disclosed are a cell-targeted nano-material and biomedical uses thereof. The magnetic nano-material can bind with specificity to iron protein receptors having high expression on the surface of tissue cells, and can enter the cells. The present material can bind with specificity to a broad spectrum of tissue cells having a high expression of iron protein receptors, and can enable highly efficient cell targeting in animal models. The material can be used as a magnetic resonance imaging contrast and a fluorescent molecular probe for disease diagnosis, as well as a vector of medicine for disease treatment.