Complex Dynamics Caused by Torus Bifurcation in Power Systems

Torus bifurcation is a relatively complicated bifurcation caused by a pair of complex conjugate Floquet multipliers coming out of unit circle on the Poincare section. A three-bus system is employed to reveal the relationship between torus bifurcation and some complex dynamics. Based on theoretical analysis and simulation studies, it is found that torus bifurcation is a typical route to chaos in power system. Some complex dynamics usually occur after a torus bifurcation, such as self-organization, deep bifurcations, exquisite structure, coexistence of chaos and divergence. It is also found that chaos has close relationship with various instability scenarios of power systems. Studies of this paper are helpful to understand the mechanism of torus bifurcation in power system and relationship of chaos and power system instabilities.     

改进型焦利秤的研制

指出了现行高校教材《普通物理实验》中焦利平（拉脱法）测量液体表面张力系数实验中操作不便,使公式有误,从而创新研制了改进型焦利秤,很好地解决了该教材中的一些问题。     

人居光环境与城市光污染防治——基于建筑表皮的城市光污染防治技术

分析了当前人居光环境状况以及"光环境影响评价"的缺失对光污染防治工作的影响,提出了基于建筑表皮的城市光污染防治技术措施,特别是建筑玻璃幕墙的光污染防治.认为在人居光环境问题日益严重的今天,除了从技术角度探讨光污染的防治问题外,还应从行政的层面建立法规规范,尤其要加大光环境影响评价力度,从根本上消除光污染的产生,营造一个舒适的人居光环境.     

平面设计中的"点、线、面"认识谈

深刻理解点、线、面的不同视觉变化,可以使设计者在艺术创作中更好地把握作品的基本形。设计作品中形的构成,其实就是点、线、面的巧妙运用。透彻地理解点、线、面在平面构成中的特点,能极大地提高高校美术专业学生的综合素质。     

一维粗糙表面电磁散射的研究

本文利用数值方法研究了一维粗糙表面对电磁散射的影响。虽然应用矩量法研究粗糙表面的电磁散射可获得较为精确的数值结果,但对于一维表面也需几千个未知变量。当求解矩阵方程时,计算机对求解的问题有内存和速度的限制。为克服这些限制,本文利用最陡下降快速多极子(SDFMM)这一方法对一维随机粗糙表面的电磁散射问题进行了研究,并与矩量法计算进行了比较。所得结果表明,当未知数较多时SDFMM算法具有更快的计算速度,而需要的内存却较少,最后的计算结果符合很好。     

失重状况下平放长圆柱型腔体内液体晃动的特性

本文对(g=0)失重状况下平放长圆柱型腔体内液体的晃动特性进行了研究。运用映射的方法,得到了液体晃动的各阶主振型晃动频率与解析解。研究结果表明:在完全失重的状况下,该种腔体内液体的晃动频率与充液比无关,仅只与液体的表面张力系数以及质量密度有关。     

Influence of medium components on elastase production using crude sources by<Emphasis Type="Italic">Bacillus</Emphasis> sp. EL31410

A newly isolated strain EL31410, producing elastase (E. C3. 4. 4. 7) with high elastolytic activity was identified asBacillus sp. In the medium optimization, it was found that wheat bran and soybean flour hydrosate were the best crude carbon and nitrogen source for enzyme production, respectively. Addition of corn steep flour can affect the bacterium growth and elastase production. A fractional factorial design was applied to study the main factors that affect the enzyme production, and central composite experimental design and response surface methodology were adopted to derive a statistical model for the effect of wheat bran and soybean flour hydrosate on elastase production. The experimental results showed that wheat bran had positive effect but soybean flour hydrosate had negative effect, on enzyme production. An initial concentration of 3.4% (w/v) wheat bran and 9.4% (v/v) soybean flour hydrosate were found to be optimal for enzyme production in batch culture. The time course of elastase production in the optimized medium composition was also described. Project (No. 300024) supported by the Zhejiang Provincial Natural Science Foundation of China     

表面处理工艺在修复脱粉机分配盘的应用

引进德国进口二手设备KSΦ5．7M干式脱粉机，经修复后用于潘三矿原煤脱粉；介绍了修复脱粉机分配盘组件的表面处理工艺过程和如何做好氧化处理前表面的准备、氧化处理、涂油等工序流程；使用效果表明，分配盘的耐比性和耐磨性较好，为修复进口脱粉机和推广脱粉工艺作了有益的尝试。     

热方程的三抛物面定理和解的唯一性

该文给出了关于超曲面族（x1^2…＋xn^2）／（t0-t）=p，满足△u-ut≥0的函数的三抛物面定理和热方程解的唯一性结果．     

Study on the Crystallization Mechanism of Spectinomycin Dihydrochloride

Dilutionisonekindofcrystallizationsthatiswidelyusedintheproductionofpharmaceuticals ,especiallyantibi otics.Dilutionhasmanyadvantagessuchashigherthrough putsbypreparingveryconcentratedinitialsolutions,loweroperatingtemperatureforheat labilesubstancesandbetterpu rificationasthemotherliquorretainsundesiredimpurities[1] .Oneofthecharacteristicsofdilutionisthatthesolventcom positionvarysastheprocessproceeds.Thesolventcomposi tionhasinfluenceonnotonlythenucleationratebutalsotherelativegrowthrateofe…