吸附热脱附-气相色谱/质谱联用分析卷烟主流烟气气相成分     

宋金勇  马宇平  王文领  郝辉  肖尊宏 《衡阳师范学院学报》2006,27(3):63-65

用CarbotrapTM349型吸附管对国产某牌号卷烟烟气气相成分进行收集,然后利用吸附热脱附-气相色谱-质谱联用技术对烟气气相成分进行了分析。分离和鉴定了122种化合物,其中烯烃、烷烃32个、呋喃类12个、酮23个、芳香族化合物21个、含氮杂环及胺类8个、醛7个、腈7个、含硫化合物4个、酸2个、醚1个、酯2个、醇3个。并初步分析了这些化合物对卷烟安全性和感官质量的影响。  相似文献   

平衡辐射场压强的探讨     

杨素琴 《雁北师范学院学报》2004,20(2):11-13

用两种方法对平衡辐射场的压强进行了探讨.得到两个结沦:(1)平衡辐射场内部的压强与腔壁受的 压强相同:(2)平衡辐射场的压强只与系统平衡时的温度有关,与其它性质无关.  相似文献   

θ-PSO： a new strategy of particle swarm optimization     

Wei-min ZHONG  ;Shao-jun LI  ;Feng QIAN 《浙江大学学报(A卷英文版)》2008,9(6):786-790

Particle swarm optimization （PSO） is an efficient, robust and simple optimization algorithm. Most studies are mainly concentrated on better understanding of the standard PSO control parameters, such as acceleration coefficients, etc. In this paper, a more simple strategy of PSO algorithm called θ-PSO is proposed. In θ-PSO, an increment of phase angle vector replaces the increment of velocity vector and the positions are decided by the mapping of phase angles. Benchmark testing of nonlinear functions is described and the results show that the performance of θ-PSO is much more effective than that of the standard PSO.  相似文献   

Effect of a biological activated carbon filter on particle counts     

Su-hua Wu  Bing-zhi Dong  Tie-jun Qiao  Jin-song Zhang 《浙江大学学报(A卷英文版)》2008,9(11):1576-1581

Due to the importance of biological safety in drinking water quality and the disadvantages which exist in traditional methods of detecting typical microorganisms such as Cryptosporidium and Giardia, it is necessary to develop an alternative. Particle counts is a qualitative measurement of the amount of dissolved solids in water. The removal rate of particle counts was previously used as an indicator of the effectiveness of a biological activated carbon （BAC） filter in removing Cryptosporidium and Giardia. The particle counts in a BAC filter effluent over one operational period and the effects of BAC filter construction and operational parameters were investigated with a 10 m^3/h pilot plant. The results indicated that the maximum particle count in backwash remnant water was as high as 1296 count/ml and it needed about 1.5 h to reduce from the maximum to less than 50 count/ml. During the standard filtration period, particle counts stay constant at less than 50 count/ml for 5 d except when influenced by sand filter backwash remnant water. The removal rates of particle counts in the BAC filter are related to characteristics of the carbon. For example, a columned carbon and a sand bed removed 33.3% and 8.5% of particles, respectively, while the particle counts in effluent from a cracked BAC filter was higher than that of the influent. There is no significant difference among particle removal rates with different filtration rates. High post-ozone dosage （〉2 mg/L） plays an important role in particle count removal; when the dosage was 3 mg/L, the removal rates by carbon layers and sand beds decreased by 17.5% and increased by 9.5%, respectively, compared with a 2 mg/L dosage.  相似文献   

R0—代数的对偶核的性质     

曹发生  张家锋 《毕节学院学报》2008,26(4)

根据R0-代数中对偶核定义,可讨论它的相关性质,此对偶核是同态原象的一个滤子。  相似文献   

带式压滤机在转炉泥浆脱水中的应用     

董伟 《辽宁科技学院学报》2007,9(1):27-28

通过带式压滤机在污水处理系统中的应用试验,表明其在转炉污泥脱水中效果较好.  相似文献   

隐式粒子云网格模拟的原理和进展   总被引：1，自引：0，他引：1  

王虹宇 《鞍山师范学院学报》2011,13(2):10-14

Partic le In Cell方法是等离子体数值模拟的基本手段之一.但传统的PIC模拟方法受到时空步长限制的影响,很难用于高密度或者大尺度等离子体研究.隐格式PIC方法是克服这一限制的主要手段.本文概述了隐格式PIC方法的基本思路和主要应用.  相似文献   

无迹卡尔曼滤波（UKF）的应用比较分析     

许迅雷 《西安文理学院学报》2011,(2):57-60

在高斯噪声环境下,由于扩展卡尔曼滤波（EKF）在目标跟踪应用中精度低和可能出现的滤波发散,将无迹卡尔曼滤波（UKF）应用于非线性系统的目标跟踪.通过UKF在目标跟踪中的应用和仿真结果的分析比较表明,与EKF相比较,UKF收敛快、对噪声适应能力强,算法实现简单.  相似文献   

有阻力的空气介质中质点的运动规律     

贾拴稳 《安阳师范学院学报》2008,(5):32-34

本文假定空气密度均匀,研究了低速运动和接近低速炮弹的速度时,抛射体的运动规律,并用得到的运动规律,计算出铅球在空气中飞行的距离关系式．  相似文献   

Optimal location and controller design of STATCOM for power system stability improvement using PSO     

Sidhartha Panda  Narayana Prasad Padhy 《Journal of The Franklin Institute》2008,345(2):166-181

The optimal location of a static synchronous compensator (STATCOM) and its coordinated design with power system stabilizers (PSSs) for power system stability improvement are presented in this paper. First, the location of STATCOM to improve transient stability is formulated as an optimization problem and particle swarm optimization (PSO) is employed to search for its optimal location. Then, coordinated design problem of STATCOM-based controller with multiple PSS is formulated as an optimization problem and optimal controller parameters are obtained using PSO. A two-area test system is used to show the effectiveness of the proposed approach for determining the optimal location and controller parameters for power system stability improvement. The nonlinear simulation results show that optimally located STATCOM improves the transient stability and coordinated design of STATCOM-based controller and PSSs improve greatly the system damping. Finally, the coordinated design problem is extended to a four-machine two-area system and the results show that the inter-area and local modes of oscillations are well damped with the proposed PSO-optimized controllers.  相似文献