二阶非线性强迫振动

本文研究二阶非线性方程[q(t)x’]’ a(t)f(x)=g(t)的解的振动性。如果或者,那么在一定条件下,方程是振动的。本文推广了文[1]的结论。     

静止式气波机振荡器振荡机理分析及振荡特性的研究

静止式气波机振荡特性取决于振荡源的形式。以共鸣器为振荡源，从管路阻抗的角度和射流噪声的角度对其振荡机理进行了分析。对机器振荡特性进行了实验研究，结果表明，从射流噪声角度解释共鸣器振荡机理更为合理，同时发现机器运行过程中出现了“压力变频”现象，在稳定的高频振荡区和低频振荡区所形成的激波强度相差很大。从而为静止式气波机的效率的提高及结构的改进提供了有益的结果。     

Test suite oscillations

This paper proposes a set of new software test-diversity measures based on control oscillations of test suites. Oscillation Diversity uses conversion, inversion, and phase transformation to vary test suite amplitudes, frequencies, and phases. Resistance and inductance are defined as measures of diversification difficulty. The experimental results show correlation between some Oscillation Diversity measures and fault-detection effectiveness.     

一类化学反应的振荡性

本文讨论化学反应A+B→2B,B→C中有逆反应时,其对应的数学模型,给出了存在唯一极限环的条件,并考虑了其何时产生强迫振荡。     

有强迫项和分段常自变元微分方程具有非振动解的充分条件

本文研究了微分方程y~1(t)-a(t)y(t)-p(t)y([t])=h(t) t≥0 (1)用不动点方法给出了(1)具有非振动解的一个充分条件,其中[t]是最大取整函数。     

阻尼对多机系统机械振模正特性的数学证明

通过对多机系统特征值问题的摄动分析，给出了特征值与系统阻尼之间的显式 表达式，得到了阻尼对多机系统机械振模正特性的数学证明。最后通过实例计 算验证了理论结果的正确性。     

一类非线性微分差分方程解的振动性线性化

首先用特征方程方法研究线性差分方程解的振动性，然后以此为基础，在一定条件下把一类非线性微分差分方程解的振动性归结到一类简单线性微分差分方程的振动性。     

Oscillation criteria of certain nonlinear partial difference equations

This paper is concerned with the nonlinear partial difference equation with continuous variables

,where a, σ_i, τ_i are positive numbers, h_i(x, y, u) ε C(R⁺ × R⁺ × R, R), uh_i(x, y, u) > 0 for u ≠ 0, h_i is nondecreasing in u, i = 1, …, m. Some oscillation criteria of this equation are obtained.     

烟火剂中的振荡燃烧现象

对具有振荡燃烧现象的体系进行了实验研究和反应机理分析,对振荡燃烧现象进行了观察和记录,得到了各反应物与振荡燃烧现象的关系。     

Hazardous waste destruction and nitric oxide reduction with externally forced oscillation

The research described here focuses on the enhancement of hazardous waste destruction and the reduction in nitric oxide and unburned emissions in a cavity incinerator, which has externally forced acoustic oscillation. The specific configuration of the incinerator was manufactured to consist of two opposing jets and a rearward facing step [Chun, 1999]. The cavity-type incinerator warrants a sufficient residence time and effective turbulent mixing by the formation of a strong recirculation region in a combustion cavity. The experiments were carried out about combustion characteristics in a 3.2 kW laboratory scale, transportable, cavity incinerator without external oscillation. These showed that hazardous waste was destructed effectively, but unfortunately NO was increased by high gas temperature. To solve this problem, we developed an externally oscillated auxiliary burner embedded on the incinerator furnace. The external oscillation was effective to reduce NO which is produced at high temperature incineration and to destruct hazardous waste, simultaneously. Emissions of NO are seen to be decreased by nearly 60%, and DRE (destruction and removal efficiency) is above 99.99%, all with external forcing at a specific optimum conditions.