Based on a questionnaire survey, this paper analyzes certain characteristics of the social networks of Beijing s urban poor families, such as scope, relationship make- up, and structural characteristics of the network, as well as contact frequency and spatial distance between network members and family members.

Model of constitutive relationship for 2D70 aluminum alloy based on BP neural network;

Establishment of constitutive relationship for Co40NiCrMo alloy;

Method for establishment of constitutive relationship based on microstructural evolution;

Advances in the structure-activity relationships of immunosuppressants;

Study of structure-activity relationships for 4,6-substituted 6-azaandrost-4-en-3-ones of 5α-reductase Inhibitors with quantum chemistry;

The antifungal activities of different new nitrogen compounds against Penicillium digitatum and their structure-activity relationships;

Studies on electronic structure and structure-activity relationship ofμ-conotoxin;

Pattern recognition study on the structure-activity relationship of novel 1,3,5-triazine derivatives;

Antioxidation mechanism of phenolic compounds in black tea and its structure-activity relationship;