. 2008. Genetic diversity of the invasive plant Coreopsis grandiflora at different altitudes in Laoshan Mountain, China. Can. J. Plant Sci. 88: 831Á837. In order to understand the relationship between genetic diversity and the invasiveness of exotic plants, genetic diversity was studied in the invasive plant Coreopsis grandiflora Hogg. at different altitudes in Laoshan Mountain, Northern China. Coreopsis grandiflora has produced a great deal of damage in Laoshan Mountain. Its genetic diversity was examined using 16 random amplified polymorphic DNA (RAPD) primers, and 125 bands were collected from all individuals. The mean percentage of polymorphic loci (P%) was 39.54%, and the total percentage of polymorphic loci (P%) was 86.40%. The mean Shannon's Information index (H 0 ) was 0.2326 and the mean Nei's genetic diversity (H) was 0.1596. These results indicated a comparatively high genetic diversity in C. grandiflora in Laoshan Mountain. The genetic differentiation among populations (G ST ) was 0.3948, indicating that most genetic diversity occurs within populations. On the whole, the abundance and the genetic diversity of C. grandiflora decreased with increasing altitude. The high genetic diversity may be related to the invasion of C. grandiflora in Laoshan Mountain. For personal use only.

Performance and reliability are eternal topics in storage system. Nowadays, vast majority of storage system are made up of hard disk drive. The performance and reliability of hard disk drive are very important subclass of the former. So far, most researches of hard disk drive are single benefit. Some improve performance and some enhance the reliability. It is very little production which can heighten both performance and reliability at the same time. A new disk model we present fills this blank. The model not only improves disk drive performance, but also enhances reliability. The model is called MHPR (multi-head parallelism and redundancy). The models add more heads in one arm assembly, introduce redundancy and parallelism into disk. We analyze the performance and reliability in theory, and use different traces to evaluate the model in a simulator. We find that MHPR model can reduce seek time and transfer time effectively. The access time of single request is reduced. The model greatly shortens the queue time of single request in the case of two traces. So, the response of request is much faster; Response time of single disk drive is reduced by 98% and 80%, respectively in heavy workload and light workload. Using MHPR model to build RAID array, the MTTDL of this storage system can be improved 2-43 times.

To a large comprehensive convention center as an example, this paper analyses the flow characteristics of fire smoke of the main hall and the feasibility for sharing space as "Quasi safety zone". First, the fire scenario was identified through the fire hazard analysis, then, set a model and take a simulation analysis by fire simulation software FDS, based on this fire scenario which have been established. At last, draw conclusions according to the smoke flow properties.

According to the current China fire protection code, the main hall as a fire compartment and its evacuation distance in this conference center both over the standards. To solve the problems, the performance-based design is put forward in the paper, such as setting up the "Quasi safety zone". For the main hall, 4 fire scenarios have been designed, next simulated and analyzed. According the result, setting fire protection facilities such as mechanical smoke control system, can achieve safety of evacuation.

“Open Cabin” includes a solid roof which has enough fire resistance, covers over the entire region whose fire load is relatively high, such as commercial building with a large area. Performance design using “Open Cabin” concept of big space, is to protect areas whose fire load is relatively high from fire using the local fire protection measures (automatic alarm system, automatic sprinkler system, fire compartment and smoke resistance facilities), in order to make up fire protection measures which cannot be set in full range within big space. Then there is no need to separate big space physically for limiting the spread of fire and smoke.