Effects of Low- Intensity Ultrasound Treatment on Excess Sludge     

DING Wen - Chuan  LONG Teng - Rui  XU Long  LI Li  LIAN He - chuan 《保鲜与加工》2006,(3):74-77

In this study the influence of the low-intensity ultrasound treatment on excess sludge has been observed.The oxygen uptake rate(OUR),soluble chemical oxygen demand(SCOD),soluble total nitrogen(TN) and soluble total phosphorus(TP) were examined for three power levels of 0.03 W/mL, 0.05 W/mL and 0.1 W/mL as well as two time series of 0~5 min and 0~30 min.It showed that there were two stages of ultrasonic treatment: the first stage took place within the flocs in four minutes,in which SCOD,TN,TP were dissolved from flocs.In the second stage,the microbial activities have been strengthened,as well as OUR,TN,TP have increased greatly.  相似文献   

The Competitive Administer plan for Taohua River Water Environment in GuiLin     

YU Ze-bin  ZHANG Xue-hong  WANG Dun-qiu  LONG Teng-rui 《保鲜与加工》2004,(3):134-137147

The thesis introduces the origin of demonstrate item on the city water environment quality improvement-tao-hua river water environment competitive administer, analyzes the current situation and cause of taohua river valley pollute and ecological destroy, and summarizes the gain and loss in projects which have taken place in the domestic city water environment competitive administer. On the base, a collectivity idea is put forward that it should stress recovering and rebuilding ecosystem on the item. Due to the water environment in taohua river is representative, if the item can be favorably carried out, it not only improves GuiLin water environment, makes people life advantage and expands city tour, but also produces important affects to the other domestic cities in the condition of using marketable economy means to improve city water environment quality.  相似文献   

Design of Distributed Monitoring System of Wastewater Treatment Process     

QING Xiao-xi  LONG Teng-rui 《保鲜与加工》2005,(2):65-67

Based on introducing fieldbus and fieldbus control system, in this paper, a distributed monitoring system for city wastewater treatment network based on LonWorks is given, the construction, function and character of this network are analyzed.  相似文献   

Behavior and Design of High-strength Bolt in Tensile Connection     

CHENG Rui  CUI Ji  LONG Li-ping 《保鲜与加工》2002,(4):25-30

The tensile strength of high strength bolt is affected by many factors, including prying force. The prying force can result in the increment of bolt force, for which the connection failed ahead of time. Several methods are presented for calculating the prying force. In the China's "Code for Design of Steel Structure" (GB50017), there is no formula for calculation of prying force and a factor of 0.8 is considered in formula for tensile strength of bolt for taking the prying force into account. It is proposed that the design value of tensile resistance for high strength bolt should be increased.  相似文献   

Effects of Cerium-rich Mischmetal on Microstructures and Mechanical Properties of Die-cast AZ81 Alloys     

ZHU Zhi-bing  LONG Si-yuan  ZHANG Zong-he  JIANG De-ping  LIAO Hui-min 《保鲜与加工》2007,(2):22-25

  相似文献   

Preliminary Study on Eco-environmental Water Demand in Taohuajiang Valley, Guilin     

WANG Yue-chuan  LONG Teng-rui  JIANG Wen-chao  LI Zai-zhong 《保鲜与加工》2007,(3):102-105

Eco-environmental water demand in Taohuajiang Valley of Guilin is defined as the minimum water volume required by the valley to maintain the eco-environmental quality not to be degraded over time.By using the site survey data,the eco-environmental water demand in Taohuajiang valley is studied preliminarily.The results calculated indicate that: the out-stream eco-environmental water demand is about 14.9 million m3 per year,about 4 percent of annual runoff of the valley;and the in-stream eco-environmental water requirement is about 109.8 million m3 per year,about 30 percent of annual runoff.This study provides scientific basis for local sustainable water resources use and management as well as for eco-environmental water requirement study in similar regions in terms of Karst geological condition and climate.  相似文献   

液体射流泵空化噪声与振动试验     

龙新平  王磊 《排灌机械》2007,25(4):1-5

针对液体射流泵的空化噪声与振动进行了试验研究;运用B＆K加速度仪和水听器对射流泵各部位在不同工况下的空化噪声与振动进行了测量。结果表明：（1）射流泵空化噪声以单极子声源为主,随着流速和紊流度的增大,偶极子作用逐渐增大;（2）射流泵空化噪声与振动随空化程度加剧而更强烈,最强烈处也从喉管向扩散管转移;（3）射流泵面积比越小,达到临界空化前噪声频谱波动越强,临界空化之后噪声谱级趋于平稳,随频率增加而递减;（4）初生空化出现前后噪声在整个频域范围内都有一个较大的跃升,约5-10 dB,此跃升可作为判断初生空化的参考方法;（5）泵体3个正交方向振动并不相同,径向振动较轴向更为明显。  相似文献   

平面曲柄摇杆机构的计算机辅助动力学分析   总被引：1，自引：0，他引：1  

龙志军  裴毅  孙松林  陶栋材  刘启定 《农机化研究》2004,(5):79-81

对平面曲柄摇杆机构进行了运动学和动力学分析，并利用MATLAB6．5对其进行了计算机模拟分析，得出了平面曲柄摇杆机构各铰节点动态规律图，对分析机构的稳定性和优化设计具有一定的参考价值。  相似文献   

离心泵调速运行试验与节能效果分析     

裴毅  杨晓珍  龙志军  罗瑶 《农机化研究》2007,(9):140-142,146

为了节约能源,提高水泵及泵站的运行效率,以喷灌泵BX50-31( =192.36)为研究对象,进行了恒定扬程和变装置扬程(假设H=KQ2)不同工况下的变速调节试验;对试验结果进行节能效果分析,得到了在相对流量为50%的调节流量下,较节流调节高达87.52%的相对节能效果.所得结论对研究离心泵的节能、离心泵设计的改进具有一定的参考价值.  相似文献   

设施农业机械设备及应用   总被引：1，自引：0，他引：1  

龙建明  李敏科  朱亮亮  林素敏 《农机化研究》2006,(11):50-53

近年来，我国设施农业的栽培面积已位居世界第一；但总的说来，农业设施技术含量不高，除拥有少量的现代化大型连栋温室外，其它各种温室的机械装备较低，导致了生产效率低下，产品质量及产量不尽如人意。为此，综述了设施农业机械的应用情况。结果表明：应用设施农业与温室生产机械化技术．能够大幅度提升可控条件下的集约化、高效化生产经营水平，将人们从繁重的体力劳动中解放出来，保证作物稳产高产，显著地提高农业整体效益，促进农业经济协调发展。  相似文献