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光纤陀螺—一种新型的全固态惯性仪表 总被引:5,自引:2,他引:3
光纤陀螺(FOG)是一种以Sagnac效应为基础的新型惯性器件。自1976年美国犹他州立大学Vali和Shorthill教授在实验室里演示了第一台光纤陀螺样机以来,光纤陀螺以其诸多优势和广阔的应用前景受到世界各国尤其是军方的关注,并获得了迅速发展。本文内容主要分为两部分,第一概述了光纤陀螺的技术优势,以及国内外的研制现状和发展趋势;第二部分报道了我们研制的FOG-M01型中等精度的全数字闭环光纤陀螺仪,详细介绍了其系统组成、工作原理和设计特点,并给出了相应的测试数据。 相似文献
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常州奔牛实验仪器厂生产的大型组合式演示回转仪,是由衡体回转仪,轴式回转仪,茹可夫斯基凳组合而成,如实验照(二)所示,它的特点是大型、直观,能见度好,演示效果明显,根据实验内容的不同要求,可以简便拆换.由于三角支架上装有滚轮,因而运行方便.是中等专业学校,大专院校物理教学演示回转体(陀螺)运动规律的教具.它能有效地演示陀螺的定向,进动,章动,以及动量矩守恒实验.也能半定量地演示理论力学中陀螺的细致运动规律.一、回转仪的结构 仪器利用26英寸自行车轮作为回转仪的惯性轮(7)与球轴(8),平衡杆(10),平衡陀(1),细调平衡陀(4),轴承(9),三… 相似文献
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陀螺进动是验证角动量定理的典型演示实验.在大学物理课的教学中,结合教学内容,让学生观察和分析陀螺进动现象,就会使物理教学生动、直观、有趣,收到良好的教学效果. 相似文献
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初中物理第二册第31页有一个用陀螺三色板演示白光的合成的小实验。学生自制陀螺三色板做实验后,我们发现如下问题:1.学生旋转陀螺的技术不易掌握,若制得不合要求陀螺就旋转不起来;2.陀螺底部若制成尖头,那么陀螺着地点总固定在一点,当陀螺轴有点倾斜时,就会产生进动,随着进动的加剧而越来越倾斜,不一会儿就触地停止;3.陀螺底部若制成圆头时,着地点在不断地移动,若着地表面不平滑,陀螺就会触地停止。学生针对上述问题,对这个小实验进行了改进,现介绍如下。 相似文献
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本文建立拉格朗日陀螺运动方程的解析方法.导出拉格朗日陀螺做规则进动的条件,用级数展开技术得到规则进动附近的小角度章动和进动的解析解.给出陀螺自转轴运动的简明图像,即重力引起绕竖直轴的规则进动和无重力的自由进动的叠加.利用解析结果对陀螺不倒之谜给出解释. 相似文献
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J. J. Rabbers B. ten Haken H. H. J. ten Kate 《Physica C: Superconductivity and its Applications》1998,310(1-4):101-105
BSCCO/Ag tape superconductors are developed for electrical power applications at liquid nitrogen temperatures. In these applications, e.g., superconducting transformers and power cables, an AC transport current and an AC magnetic field are present at the same time. A set-up to measure the influence of external AC magnetic field on the transport current loss, i.e., the voltage drop across a sample supplied with an AC transport current, has been developed. The magnetic field can be applied both parallel and perpendicular to the broad side of the tape conductor. An increase of the transport current loss due to the external AC magnetic field is observed. When a DC external magnetic field is applied the increase of the self-field loss can be described well by the decrease of the critical current due to the magnetic field. In the case of an AC external magnetic field this is only a minor effect. For magnetic field amplitudes higher than a certain threshold value the transport current loss is described reasonably well by the self-field loss and a dynamic resistance contribution calculated from the DC voltage–current relation in AC magnetic field. 相似文献
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A. N. Lykov A. Yu. Tsvetkov G. F. Zharkov 《Journal of Experimental and Theoretical Physics》2005,101(2):341-349
Numerical methods are used to analyze the Ginzburg-Landau equations for a superconducting plate carrying transport current in a magnetic field. Critical current is calculated as a function of the applied magnetic field strength for superconducting plates with different thicknesses. The relations between the field dependence of critical current and the distributions of order parameter, magnetic field, and supercurrent in a plate are analyzed. The field-dependent critical currents computed for plates are used to determine the critical current as a function of the applied magnetic field strength and local magnetic field and current distributions for multilayers in parallel magnetic fields. The constituent superconducting layers are assumed to interact only via magnetic field. A simple method is proposed for analyzing the critical states of multilayers in magnetic fields of arbitrary strength, based on elementary transformations of the critical current-density distribution over individual layers in zero applied magnetic field. The method can be used to analyze experimental results. 相似文献
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采用全电磁PIC粒子模拟方法研究了磁场对球头阴极二极管物理特性的影响。结果表明外加磁场主要是通过对二极管束流轨迹的改变来影响二极管的物理特性。由于外加磁场将约束其产生电子束的发散,结果使其空间电荷限制电流减小,其值在无外加磁场并且自磁场可以忽略时的空间电荷限制电流值的0.5~1倍范围内。当外加磁场足够强时,束流轨迹主要受外加磁场控制,二极管产生的电子束既不箍缩也不发散。强外加磁场条件下的空间电荷限制电流近似为无外加磁场时的一半;在无外加磁场条件下,在阳极处的束流半径随二极管电压电流的增大而减小,空间电荷限制电流增强因子随束流半径的减小而减小,随二极管电压电流增大而减小。这一系列结果是在二极管电流小于其自箍缩临界电流条件下得到的。 相似文献
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研究了过滤阴极真空电弧技术中,不同的磁过滤器电流下(5—13 A),制备的四面体非晶碳(ta-C)薄膜对摩擦学特性的影响.通过对薄膜厚度,薄膜结构以及薄膜表面粗糙度随磁过滤电流的变化结果进行了测试,结果表明,随着磁过滤器电流的增大,薄膜的sp3键含量逐渐减少,表面粗糙度从0.13增大到0.38.磁过滤器电流在5 A时,薄膜的摩擦系数最小约为0.08,当电流增大到7 A时,摩擦系数显著增大,磁过滤器电流从7 A增大到13 A时,薄膜的摩擦系数再次减小约为0.1.
关键词:
四面体非晶碳
过滤阴极真空电弧
磁过滤器电流
摩擦系数 相似文献
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Oscillating nature of current pulses under d.c. excitation in subnormal region with longitudinal magnetic field at pressure
range 0.20 torr to 0.85 torr have been studied. The frequency, bandwidth, peak-peak voltage, cut-off current and rise time
of the current pulses have been observed with pressure, average tube current and magnetic field. A study of these oscillograms
in magnetic field, average tube current and pressure are presented. The probable mechanism for the generation of oscillation
based on space-charge field modification with magnetic field is discussed 相似文献
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Effect of longitudinal applied magnetic field on the self-pinched critical current in intense electron beam diode
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The effect of applied longitudinal magnetic field on the
self-pinched critical current in the intense electron beam diode is discussed.
The self-pinched critical current is derived and its validity is tested by
numerical simulations. The results shows that an applied longitudinal magnetic field
tends to increase the self-pinched critical current. Without the effect of
anode plasma, the maximal diode current approximately equals the
self-pinched critical current with the longitudinal magnetic field
applied; when self-pinched occurs, the diode current approaches the
self-pinched critical current. 相似文献
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N.A. Bogolyubov 《Physica C: Superconductivity and its Applications》2010,470(7-8):361-364
Our experiments performed earlier have shown that, when an external magnetic field is absent, the transport critical current in 3-d superconducting ceramics is a homogeneous function of the sample transverse sizes. The transport critical current density and magnetic field induced by the current are homogeneous functions of a point on the sample cross-section. Using these experimental results equations describing the induced magnetic field pattern in ceramic sample have been derived. The distributions of the transport critical current density and induced magnetic field in the samples having polygonal, diamond-shaped cross-sections illustrate the results. 相似文献
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用毕-萨定律计算圆平行板电容器极板上电流的磁场 总被引:3,自引:1,他引:2
用毕-萨定律计算了分布在圆平行板电容器极板上电流的磁场,从而证实了:1)在似稳条件下磁场完全是由传导电流产生的,“位移电流”的磁场为零;2)极板电流在电路容器内部产生的磁场很大,它极大地的削弱了馈线电流的磁场,使得电容器内部的磁场很小. 相似文献