电流

By the circular current symmetry characteristic,on the basis of Biot-Savart law,the expression of the whole-space magnetic induction intensity distribution was deduced in the spherical coordinates system.

在球坐标系中，由磁感应强度的计算公式毕奥-萨伐尔定律出发，利用圆电流磁场的对称性推导出全空间磁感应强度B分布公式，讨论了圆电流平面上和中心轴线上的磁场，应用C数值计算方法对全空间磁感应强度B公式求解，绘制出磁感应强度分布的主要区域及磁场的空间分布图，并对全空间磁感应强度B分布特点进行了讨论。

According to the Law of Biot-Savart, the author concludes that there is an electric current which can distort the diurnal variations of the geomagnetic vertical component beneath the boundary line of the geomagnetic low-point displacement within and in the vicinity of the day of the geomagnetic low-point displacement anomalous.

作者依据Biot-Savart定律推测，在低点位移异常期间，在低点位移线下方有一引起地磁垂直分量日变化畸变的电流通过，且该电流为线状分布，或仅在垂直面内有分布，埋深一般认为几十千米。

With the air-gap current and the image current adopted and Biot-Savart's law based, a numerical method, which divides the natural end-winding segments of the coil into many micro-segments, is carried out to get end-winding inductances between two coils.

通过引入气隙电流和镜像电流，以Biot-Savart定律为基础，把线圈端部各大段分成若干小段，用数值方法计算两线圈间端部电感。

The college physics teaching materials have only studied a little magnetic induc tion on the axis of the roun d electric current,have not provided the formula of calculating to the magnetic induction that the round on e is inside a bit more wanton, after Biot-Savart law of trees formula can draw w anton magnetic induction expression formula of intensity a bit inside the round electric current.

大学物理教材中只研究了圆形电流轴线上一点的磁感应强度 B ，而对圆面内任意一点的磁感应强度 B却未给出计算公式。本文运用毕奥—萨伐尔定律及西普森公式，计算出了圆形电流面内任意一点磁感应强度的表达

With internationally latest studies, the paper also proposes some biquadrate filters which are capable to perform the functions of second-order low pass、 high pass、 band pass、 band stop、 all pass filtering by selecting one of the three inputs or their proper combinations from the same configuration, furthermore whose natural frequency and the quality factor can be tuned independently. Then a continuous-time biquadratic filter using CCCII is proposed, which can be used in hearing aids and in other analog signal processing applications. Lastly a current mode and a voltage mode novel n-order filters of multifunction are presented. Not all both of the n-order filters are electronic tunable,but also they are integrated conveniently and compatible with VLSI technology.

尽量的全面归纳以电流控制传送器为有源器件的有源网络模拟电路、模拟信号处理电路，借鉴国内外最新研究成果，提出两种基于CCCⅡ的双二阶滤波器，这些电路在不需要改变电路结构的情况下，能同时实现低通、高通、带通、带阻或全通多种滤波功能，并且滤波器的特征频率ω_0和品质因数Q可实现独立调节；其中一种基于CCCⅡ的双二阶滤波器，首次提出将CCCⅡ应用于可编程助听器领域；最后设计了两种高阶滤波器，电压模式和电流模式各一种，这两种滤波电路均能实现多种滤波功能，能实现滤波器参数的电调谐，具有易于集成等优点。

To obtain current-mode biquadratic filter with high accuracy, a voltage-mode second order universal filter based on two VFA's was transformed into a current-mode biquadratic filter-based on two AOA's by means of the concept of adjoint network.

为获得高精度电流模式双二次滤波器，以双VFA电压模式二阶通用滤波器为原型，用伴随网络的概念设计出AOA电流模式双二次滤波函数的新电路。

We used the numerical simulation, considered the variation of potential, electric field and carrier concentration in SITH, researched and expatiated the rule of increasing current in block-state, the mechanism of breakover phenomenon and the on-state voltage drop.

研究中采用了数值模拟的方法，从器件内部的电势、电场以及载流子浓度的变化角度，阐述了阻断态电流增长的规律、转折发生的原因、以及导通态压降和电流的变化特点。

When a lightning current or over-voltage reaches the threshold value of the zinc oxide resistor, the resistance of the zinc oxide quickly breakover and bleed the lightning current to the earth, thus protecting the circuit.

当有雷电流或者过电压达到氧化锌电阻的阀值时，氧化锌电阻迅速导通，将雷电流泄放到大地，从而对电路起到保护作用。

The results show that by using the brightener, current efficiency is improved and bright, corrosion resistant zinc deposits are obtained at a wide current density range.

结果表明：使用该光亮剂能提高镀液的电流效率，且在很宽的电流密度范围内获得光亮、耐蚀的锌镀层。

In this case,the source of the earth's magnetic field is the current produced by displacement of a double electrical layer's plates appearing on the boundary of the solid and liquid phases of the nucleus (the layer F of Bullen's earth's model).

在这种场合下，地球磁场的本源就是电流，这种电流是由在地核固相与液相边界上的一对带电层的相对运动产生出来的(Bullen地球模型中的F层)。

Breath, muscle contraction of the buttocks; arch body, as far as possible to hold his head, right leg straight towards the ceiling (peg-leg knee in order to avoid muscle tension).

呼气，收缩臀部肌肉；拱起身体，尽量抬起头来，右腿伸直朝向天花板（膝微屈，以避免肌肉紧张）。

The cost of moving grain food products was unchanged from May, but year over year are up 8%.

粮食产品的运输费用与5月份相比没有变化，但却比去年同期高8％。