In respect to conventional particle size distribution, the fractal size dimension (FSD) has become a powerful tool for characterization of particles.In this paper, we applied both the single fractal law and the bi-fractal approaches to analyze the fractal and mutifractal characteristics of the Qingshuiying coal particles in the ultra-fine pulverizing process. The relationship between FSD and the ultra-fine pulverizing time was detected and had certain guidance meaning for optimizing the operational parameters and reducing energy consumption of the ultra-fine pulverization.
Based on field investigation and lab analysis, litter production and season dynamic in the different ages of Eucalyptus plantation (2006, 2005, 2004, 2003, 2002) were studied in this paper. Based on litter collection during 1 years, the annual litter production was estimated to be 2797 kg•hm-2, 4489 kg•hm-2, 3098 kg•hm-2 and 3692 kg.hm-2 for 2006, 2005, 2004, 2003 and 2002. Variance analysis showed that the difference of the litter production of the eucalyptus plantation between 2006 and 2003, 2005 reached the extremely significantly level (p<0.01). Monthly litter production showed seasonal dynamics to some extent. There were two peaks for 2006 and 2002, with occurring in April, September and, February and April respectively and three peaks for 2004 and 2003, with occurring in in February, April and June. But there was only one peak appearing in June. Synthetically, the litter production of 2006, 2002 achieved maximum in April accounting for 13.50% and 28.09% of the total but 2005, 2004 and 2003 achieved in June accounting for 23.83%, 21.33% and 19.23% respectively. Fallen leaves accounted for 84.86%~90.04% of the total litter, droppings for 5.01%-6.70%, branches for 2.95%-4.52%, barks for 2.64%-3.62%, and fruits for 0.00%-0.55%%.
Bell comes from the Bell of Jiangxi Normal University 70 Anniversary celebration. Ring is the class ring on the campus of Jiangxi Normal University. Soundscape is used to describe the acoustic environment to the listener as the center of, referring to the sound in a certain area of the overall situation. The present study subjectively evaluated the two elements of voice on the campus. We could acquire acoustic waveform and frequency by the physical analysis of both two elements. Bell acoustic showed weakened by the strong cycle, frequency 249.79Hz (B3 +19); ring acoustic frequency was 500.08Hz (B4 +21). Therefore, Bell structured but ring was on the contrary, bell frequency was lower than ring, and bell pitch was slightly lower than ring pitch. Synthesizing physical analysis, subjective evaluation of sound quality, subjective feelings of the two elements (bell and ring), the subjective evaluation of bell was better.
In order to the search for more effective noise control measures and a more rational urban planning from the angle of economy, environment, so that we can create a healthier living environment, this paper does some preliminary investigation in the aspect of soundscape. This paper introduces soundscape science research status and research results domesticity and abroad, and on this basis, makes a subjective evaluation of voice of the landscape in Jiangxi Normal University, by combinating Psychoacoustic Evaluation Method. This paper record various of sounds existing in the campus, analyses properties of each sound, and does a large-scale survey about the popularity of these sounds. The paper chooses ten most popular voices using mark-giving method, and analyses the ten 10 kinds of sound by SD methods. The following are the results: (1) the ten most popular voices in the campus: voice of birds, sounds of musical instruments, voice of singing、reading、and teachers’ lectures, and the sound of radio(music)、 broadcasting (in English and other programs)、computer sound (music, film sound) and wind,50% of which are natural sounds, 30% human voice, and 20% noise of machines. From above, we can see that the sounds from nature are more acceptable. (2) By using semantic differential method (SD Act), the paper does a subjective evaluation on the ten popular kinds of voices. Marks are different form different analysing angle, that is, different people like different voices on different degrees. (3) When people work and learn, it is good to create some comfortable sounds in the surroundings and control or eliminate noisy sounds. Creating a comfortable sound surrounding environment is a good way to improve people’s working and learning effeciency.
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