This study aimed to explore the mediation effect of search for meaning between absence of meaning and meaning in life, and tested the role of satisfaction of psychological need in this process via two-wave data. The sample consisted of 156 university students. Participants reported absence of meaning, search for meaning and psychological need satisfaction at time 1 and reported meaning in life at time 2. Results indicated that search for meaning played a partial mediating role between absence of meaning and meaning in life, and psychological need satisfaction moderated relationship between meaning thinking and meaning in life. Under low-level of psychological need satisfaction, search for meaning was strongly associated with meaning in life. With increased satisfaction of psychological need, positive effect of search for meaning on meaning in life become insignificant.

To solve the problem that the dimension of the speech emotion characteristic value is big and it is difficult to train, a new speech emotion recognition model, MFCCG-PCA, is put forward by the combination of the MFCC model and the PCA model. Multiple sets of experiments show that the MFCCG-PCA model has larger performance improvement than general MFCC model in the aspect of speech emotion recognition.

From 2003 to 2012, 446 times of survey had been conducted on community structure of birds at Yanyuan, Peking University. 234 of them, on which 468 hours had been spent from 2010 to 2012, were weekly transact surveys, twice in spring and autumn while once in summer and winter. Up to 178 species, belonging to 102 genera of 37 families of 14 orders, had been recorded. Among them, there are 24 residents, 117 migrants, 24 summer visitors, 19 winter visitors and 1 vagrant. One of them is listed as the 1st class of China National Protected Wildlife, whilst 20 species as the 2nd class. 28 species of waterbirds were recorded. On different sub-regions of Yanyuan, the most species-poor one is Jingyuan, where only 28 species were recorded . The most species-rich one is Mingheyuan, where 109 species were recorded. The mosaic landscape of meandering swamps and mounds covered by semi-natural secondary forest in Mingheyuan and Jingchunyuan accommodates the richest bird community in Yanyuan. 73 species were restricted to these sites. The ratios of secondary forests and greenbelts in each sub-region are chief factors affecting the abundance of bird species.

By field investigation and the comprehensive analysis of the GPS observation data, some new recognitions were obtained about the late quaternary movement characteristic of Jiali Fault. The Jiali Fault isn’t an overall dextrall strike-slip. Its movement features and rates are variable in different tectonic parts. Jiali Fault can be divided into three sections by Eastern Himalayan Syntaxis (EHS). The fault in west area of the EHS is the northwestern segment of Jiali Fault, the fault in Yigong-Tongmai area on the top of the EHS is the middle segment, and the fault in the southeast area of the EHS is the southeastern segment. The northwestern segment is right-lateral compressive movement, with a strike slip rate of 3.2?5.8 mm/a. The middle segment has weak dextral compressive movement, with a strike slip rate of 1.3?2.0 mm/a. The southeast segment is left-lateral compressive movement, with a strike slip rate of 3.7?4.0 mm/a.

It is studied that the CMC surfaces in the sphere space of dimension 3 by means of integrable system and its spectral transformation is given.

Hemodynamics of intracranial lateral aneurysms was simulated numerically. The blood was considered as Newtonian fluid and the elasticity of the wall was neglected. Three-dimension N-S equations were solved by using artificial compressibility algorithm. The influence of aneurysmal geometry shape and Reynolds number on hemodynamic factors, such as shear stress on the wall, pressure were calculated in the static and pulsatile conditions. The main results were that the greater depth of intracranial aneurysm, the greater distal shear stress is in which the aneurysm grow up and rupture for the intracranial aneurysms in the early stage in both static and pulsatile conditions; the pulsatile make the variety of distal shear stress with space and time more violent and easier rupture. The distal shear stress of aneurysm increases while the arterial diameter decrease and the velocity keep constant. It shows that the intracranial aneurysm is easier grow in small artery than that in the bigger blood tube. This result is consistent with physiology.

It is studied that the geometry of the differential equations of the fourth order y⁽⁴⁾=f(x, y, y', y", y''') under contact transformations by E.Cartan's method of equivalence.

Topological properties of higher dimensional spaces are analyzed and a standard graphic method to express such spaces is deduced. An N-dimensional space posesses 2^N vertices which can be arranged according to their Hamming distance values. Molecular structures of organic compounds can be embedded into the frame of a higher dimensional space, and a new topological coding system for the molecular structure of organic compounds is then derived. In this coding system, different superscripts are used to denote different kinds of nonhydrogen atoms. The connection pattern of the nonhydrogen atoms are encoded according to their positions and arrangements in the higher dimensional space. This topological coding system is simple, universal, unique and easy to use. Different kinds of stereoisomers and the chirality of the organic compounds can be distinguished in this coding system. The chirality of L-type and D-type amino acids and their relationship to the topological coding system is particularly analyzed.