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Articles by Kai Zhang
Total Records ( 4 ) for Kai Zhang
  Wan-Yu Deng , Kai Zhang , Qing-Hua Zheng and Wei Wei
  Compared with macro visualization like small-world structure in WWW, some fields such as knowledge visualization need such layout that can show detailed information of nodes and at the same time can reveal clustered structure of the Graph. Based on modular decomposition, energy model and adjustable center distance, one hierarchical layout algorithm was proposed. Through modular decomposition, the graph was firstly represented by a tree hierarchically. The local positions were then obtained from bottom to top and then the global positions are obtained from top to bottom. The experimental results on various datasets showed that the algorithm can achieve artistic and nearly non-overlapping appearance.
  An-An Jiang , Ming-Zhou Li , Kai Zhang , Yi-Ren Gu and Xue-Wei Li
  PPARGC1A, the gene encoding peroxisome proliferative activated receptor-γ coactivator-1α is a useful candidate gene for pork quality due to its regulation of the determination of myofibre type. In this study, changes in developmental gene expression of PPARGC1A in longissimus dorsi muscles were examined in two pig breeds, Landrace (lean) and Meishan pigs (obese) at birth, 30, 60, 90, 120 and 150 days of age using quantitative real-time PCR. The results indicated that there were distinct expression patterns of PPARGC1A in the two pig breeds. At most stages, except at 30 and 60 days, the abundance of PPARGC1A mRNA in Meishan pigs was significantly higher than that in Landrace (p<0.01). Interestingly, there was a negative correlation between the PPARGC1A expression pattern and myofibre cross-sectional area across five developmental stages which implies that PPARGC1A might have an important influence on myofibre growth.
  Kai Zhang , Wu Zhao , Chen Wang , Ling Chen and Junsong Zhang
  Based on the characteristics of product innovation design, product innovation was designed into several stages: requirements analysis, problem-finding, problem-analyzing, problem-solving, innovative solution-generation and solution-evaluating. To help designers find problems, analyze the problems and solve the problems, the innovation model based on problem-solving was developed and the approaches to find problem were presented. In addition, different types of problems in product innovation design were analyzed; a systematic model supporting problem representation was put forward. Based on internal variable of the problem, the problems were divided into four grades and the strategies for solving each grade of problems were presented. Besides, several examples were cited to demonstrate the feasibility of the models and methods. Finally, a preliminary prototype software system of computer-aided design for product innovation was developed.
  Kai ZHANG , Xiao-Niu XU and Qin WANG
  Nitrogen cycling has been poorly characterized in urban ecosystems. An in-situ buried bag incubation technique was used to quantify net rates of N mineralization and nitrification in soils of two urban sites, a street greening belt and a university campus, and a suburban site, a forest park, in Hefei, East China. The average concentration of extractable NO3 in the surface soil (0–10 cm) was significantly higher at the urban sites than the suburban park site, whereas extractable NH+4 concentration was significantly higher at the suburban park site than the urban sites. The forest park soil had greater potential N mineralization (148.1 μg N cm−3) than the soils from the campus (138.3 μg N cm−3)and street (99.8 μg N cm−3). The net mineralization rates varied between 1.63 and 2.69 μg N cm−3 d−1 and net nitrification rates between 0.82 and 1.02 μg N cm−3 d−1 at the suburban forest park site, but the rates varied from 1.27 to 2.41 μg N cm−3 d−1 and from 1.07 to 1.49 μg N cm−3 d−1, respectively, at the urban campus site. Both net mineralization and nitrification rates were lower during dry seasons. Results from regression analysis indicated that net N mineralization was significantly and positively correlated with soil moisture and soil C/N ratio, and was negatively correlated with soil pH. Relative nitrification was, however, significantly and negatively correlated with soil moisture and soil C/N ratio, and was positively correlated with soil pH. Mean relative nitrification was 0.763, indicating the dominance of nitrate cycling relative to ammonium cycling at the urban sites. The urban soils had the great potential for N losses compared to the suburban soils.
 
 
 
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