对测量镇流器参数实验方法的讨论

对测量镇流器参数实验方法的讨论刘正生，戚善和（扬州大学师范学院２２５００２）在一般《电磁学》或《电工学》的单相交流电路实验中，都要安排做一个用日光灯管（作为电阻Ｒ）与镇流器（作为具有一定内阻厂的电感Ｌ）串联组成单相交流电路的实验，测量电路电流，各段电...     

日光灯镇流器的物理知识

1日光灯管的结构 日光灯的主体是灯管，又叫低气压汞蒸气放电荧光灯，它的基本结构如图1所示：在一根内壁涂有荧光粉的玻璃管两端分别装螺旋状的钨丝灯丝作电极，上面涂有氧化钡等容易发射电子的氧化物，(少数电极由电金属圆筒组成冷阴极)．抽出管内的空气充入少量氩气等低压惰性气体和放进少量液汞，密封就成了一支日光灯管．     

剖析日光灯

1 日光灯结构及各元件的作用 日光灯主要由灯管、启动器、镇流器组成．家庭常用日光灯的电路图如图1所示．     

电子镇流器进一步节能的实验研究

对预热启动式电子镇流器进一步节能的途径和实验方法进行了研究，从实验中得出实验数据和结论。     

用电容和二极管改进低压钠灯、汞灯电源中的镇流器

本介绍了用电容器和二极管代替低压钠灯、汞灯中镇流器的方法。     

功率因数校正技术在电子镇流器中的应用

本介绍了功率因数校正的基本原理,论述了单级功率因数校正技术在电子镇流器应用的巨大潜力,并详细分析了如何使用电感和电容实现电路的功率因数校正。     

日光灯的低压启动

日光灯的低压启动曾伟全（四川新都县大丰中学６１０５０４）当电源电压过低（例如１５０Ｖ）或日光灯管灯丝断开时，可用如下方法改装镇流器和加装电容来启动和使用日光灯．以４０瓦的为例，在镇流器两组线圈中间（即在镇流器没有５！出线的一端）有个结头（或连线），将...     

可拆式镇流——涡流器

点燃日光灯管的镇流器和显现涡流存在的装置,原来是两套仪器。同时,市售的日光灯镇流器为绝缘胶和铁壳所密封,学生无法看到其内部结构,很不直观。为了便于演示时操作、增强演示效果,做到一器多用,设计并制作了这个镇流——涡流器。它的特点是内部结构基本裸露,学生观察时一目了然,组装方便。     

从波形图谈日光灯电路的实验设计

1问题的提出 在大学和中专电工学实验教学中,要有学生做测量日光灯电路的功率、功率因数等的实验[1],相量图给出后,在实验中学生实际测量时经常用电压表测出电路总电压、灯管两端电压、镇流器两端电压的数值,用余弦定理计算幅角ψ.然而这样测量算出的幅角与用功率表测出的有功功率和用电压表、电流表测得的视在功率的比值求出的幅角相比,前者总是偏小10°～15°.这种差别是怎样引起的?测量日光灯电路的功率、功率因数的实验究竟怎样做?     

对日光灯管的电路模型的定性分析

对日光灯管的电路模型的探讨是教学中很好的拓展课题,然而多篇文献给出了不同的结果,为此,本文依据常规课堂实验数据,通过对电感线圈镇流器型日光灯电路的分析,探讨了日光灯管的电路模型的构建,结果表明正常工作状态的灯管的负载属性应该为电感性,可以近似认为纯电阻性。同时,依据经典电磁学理论对灯管的工作机理进行了定性分析,所得结果与实验描述一致,并对其他文献中误判为电容性的原因给出了解释。     

关于"太阳在银河系中所受引力与到银心距离r的关系"的讨论

讨论了银道面内的引力场强分布和太阳在银河系中所受引力与到银心距离r的关系，指出引力场强g并不是与r的平方成反比，这是由于银河系的大小和形状不能忽略造成的．强调了万有引力定律的适用条件．     

On the predictability of the positions of the convergence zones in the ocean

The disagreement between the experimental and calculated positions of the first convergence zone are known from many publications. The most probable cause for such a disagreement, namely, the incorrect specification of the input data for the calculations, is considered. The lack of simultaneity between the hydrological surveys of the region and the acoustic experiments is emphasized. The experimental data obtained by the author in five ocean regions are presented. These data characterize the diurnal variability of the distance from the source to the nearest boundary of the convergence zone. The relations proposed by different researchers for calculating the sound speed from the temperature, salinity, and hydrostatic pressure are analyzed. It is shown that these relations lead to a substantial difference in the estimated depth dependence of the hydrostatic gradient of the sound speed. The position of the first convergence zone is calculated for the propagation conditions determined by vertical temperature and salinity profiles with the subsequent recalculation of these profiles into sound speed profiles by using eight different formulas known from the literature. It is shown that different formulas lead to different values of the distance to the first zone; this difference is substantially greater than that between the calculations and experiment. The necessity of improving the recalculation relations in view of the experimental data on sound propagation in natural oceanic waveguides, including the data on the actual positions of the convergence zones, is emphasized.     

On the calculation of the bremsstrahlung in the region of the plasma frequency

On the basis of the classical theory of radiation produced in incomplete Coulomb interaction, a formula is derived for the coefficient of the bremsstrahlung of fully ionized plasma. In the region of rectilinear approximation a comparison is made with the results of the quantum formula derived from the Born approximation. Furthermore, the influence of dispersion upon the emission coefficient is taken into account; some relations for the region of dispersion are given.     

Dependence of the Intensity of the Spectral Lines and the Composition of the Sample and the Plasma Parameters of the Unipolar Arc

The investigation was made of the dependence of the intensity of Tl, Ga, Mo, Mg, Mn, Sn, Bi, Ni, Zn, Pt and Au spectral lines and the plasma parameters (temperature T, electron concentration n_e, degree of 6 ionnization α) from concentration of lithium additive.     

Extracting the wavefunction of the LSP at the LHC

We consider associated production of squarks and gluinos with the lightest supersymmetric particle (LSP), or states nearly degenerate in mass with it. Though sub-dominant to pair production of color SU(3)-charged superpartners, these processes are directly sensitive to the wavefunction composition of the lightest neutralinos. Exploiting event-shape variables - including some introduced here for the first time - we are able to identify the composition of the LSP by selecting events involving a single high-pT jet recoiling against missing transverse energy. We illustrate the proposed technique on a set of benchmark cases and propose methods for applying these results in more realistic experimental environments.     

Set the controls for the heart of the Sun

In this paper we describe experiments conducted with high-power lasers that are attempting to replicate, for a very short time and in miniature, conditions found in the Sun. Experiments to date have reached conditions in the outer part of the Sun. To reach the Sun's centre requires compression of material to very much greater than solid density and heating to over ten million degrees. To achieve this, a new class of experiments and a new generation of high-power lasers are required.