查询词典 bit error rate

For signed-bit values, if the number to be encoded is positive, an extra bit is necessary to preserve the leading 0; otherwise sign extension changes the bit value into a negative number.

对于带符号的位值，如果这个编码长度能够确定，一个扩展位必须保留第一位是0；否则，符号扩展将改变这个位值为负数。

On the base of above models and theories, three new kinds of bits, i.e. extended nozzle roller bit, self\|resonating water jet bit and combined jet and mechanical rock\|cutting bit, are developed.

当时 ，部分学者片面认为水射流的压力越高越好，日本研究出 170 0MPa的增压器，前苏联和美国研究出 56 0 0MPa的脉冲射流发生器。

Finally rescued, of course, he is no good, just a little bit more senior than me, his eyes little better than I freshman nose quite a bit better than I, elegant style of conversation than I am a little bit of it.

杰西克终于救出来了，当然，他也没什么好的，只不过比我高一点点，眼睛比我大一点点，鼻子比我挺一点点，谈吐比我优雅一点点而已。

A new model of bit commitment named three-party bit commitment is proposed in this paper, in which two provers jointly commit a bit to a verifier.

该文提出了三方比特承诺模型，在该模型中，由两个证明者共同向一个验证者作出承诺。

In order to raise drilling speed of the non saline dome wells in Kenkiyak Oilfield, the relationship between rake angles of the cutter, profile of the bit, which have effect on cutting depth and impact-resistant of PDC bit cutters, and cutting efficiency is studied respectively using finite element analysis according to rock properties of the research area. The structure of the PDC bit is then optimized by using the research result.

为提高肯吉亚克油田非盐丘井钻井速度，根据地层岩石力学参数评价结果，利用有限元方法对影响PDC钻头攻击性和抗冲击性的齿前角、冠部形状等结构参数与破岩效果之间的关系进行了研究，并对PDC钻头的结构进行了优化设计。

Using the method integrating geoscientific research with bit selection research, analysis is made on the stratigraphic-lithologic characteristics of all geological intervals in the area, the effect on bit selection and how to increase drilling speed is made clear. Based on the above, the conceptual profiled design for bit selection and drilling methods of all geological intervals is proposed on the basis of the stratigraphic-lithologic characteristics.

应用地学研究与钻头选型研究相结合的方法，对该地区各地质层段的地层产状与岩性特征进行了分析，获取了钻头选型对提高钻井速度影响的认知，提出了基于地层产状与岩性特征的各地质层段钻头选型及其钻井方式的轮廓化概念设计。

Eatures · Compatible with MCS-51 Products · 2K Bytes of Reprogrammable Flash Memory – Endurance: 1,000 Write/Erase Cycles · 2.7V to 6V Operating Range · Fully Static Operation: 0 Hz to 24 MHz · Two-Level Program Memory Lock · 128 x 8-Bit Internal RAM · 15 Programmable I/O Lines · Two 16-Bit Timer/Counters · Six Interrupt Sources · Programmable Serial UART Channel · Direct LED Drive Outputs · On-Chip Analog Comparator · Low Power Idle and Power Down Modes Description The AT89C2051 is a low-voltage, high-performance CMOS 8-bit microcomputer with 2K Bytes of Flash programmable and erasable read only memory.

eatures ·兼容MCS - 51的产品·及2k字节的编程快闪记忆体-耐力： 1 000写/擦除周期·在2.7 V至6 V的操作范围·完全静态的运作： 0 Hz至24兆赫·两个层次的程式记忆体锁· 128 × 8位内部RAM · 15个可编程I / O线·两个16位定时器/计数器· 6中断源·可编程串行UART的频道·直接驱动LED产出·单晶片模拟比较·低功耗的闲置和掉电模式描述该AT89C2051的是一个低电压，高性能的CMOS 8位微机与及2k字节的Flash可编程和可擦除唯读记忆体。

A new symbol-constrained joint source-channel decoding algorithm for VLCs is presented.By constructing double-tree VLCs sources,the propagation-error problem is evidently alleviated.Meanwhile,by applying symbol-constrained method to MAP algorithm,not only the a priori probability of VLCs sources is efficiently utilized,but also the Symbol Error Rate is reduced enormously.

提出了一种新的针对不等长编码信源的符号约束MAP联合译码算法，利用VLCs双树信源的构造方法，有效地抑制了VLCs的错误扩散；同时，通过将"符号约束"的思想应用于最大后验概率译码算法，不仅充分利用了信源先验信息，而且极大地降低了误符号率。

According to the demand of high magnetic field power supply, reference is increased with a set ramp rate and stops at a set stable value, so reference system is composed of digital setting and digit to analog converting circuit. But the stability of reference is mostly guaranteed by the performance of D/A circuit, so D/A circuit is particularly studied in reference system. The scheme of D/A circuit, the selection of DAC and its voltage reference, hardware anti-jamming design and PCB design are discussed in detail, and software of remote control and PLC are discussed in brief. Zero-flux DC current transformer well satisfies the demands of the high stability of Load current detection unit, so the principle of zero-flux DC current transformer is analyzed; in the mean time a project which detects the long term stability is designed. During 8 hours, analog signal which is detected with high precision digit multimeter is recorded in computer at 1HZ frequency by GPIB communication. The drift error source and related parameters are explained in the compare-amplify part. Detailed subtraction circuit is designed; also amplifier chip and periphery components are selected and verified according to the theory of error analysis.

根据强磁场电源的需求，参考源应按照软件设定的斜率逐渐上升到设定稳态值，则参考源系统应由数字给定和数模转换电路两大部分组成，而参考源的稳定度主要依靠完成数模转换功能的模拟电路的性能来保证，因此本文对参考源系统的研究以数模转换电路为重点，分别从电路方案的确定、数模转换芯片及其基准电压源的选取和验证、电路板硬件抗干扰和PCB设计几方面进行了论述，然后对数字给定部分的远控组态和PLC程序设计作了简要介绍；采用零磁通原理的直流电流转换器很好地满足了对负载电流检测单元高稳定度的需求，本文详细分析了零磁通检测的原理，并在选定此种类型电流转换器的基础上设计了一套检测长期稳定度的方案，8小时内以1秒为采样周期，通过计算机Labview程序和高精度数字电压表的GPIB通讯，将被高精度数字电压表数字化后的模拟信号采样值连续记录至计算机中；比较放大环节简要阐述了漂移产生的原因和相关参数指标，确定了具体的减法电路形式，并根据误差分析理论对运算放大器和外围元器件进行了选取和验证。

The error threshold becomes a narrow band which broadens and shifts toward large values of error rate with increasing fluctuation.

误差阈变宽，并且在涨落增加时向大的突变率方向移动。

The system can be widely used in belt weighing and batching process control,etc.

介绍了基于智能模糊控制的嵌入式配料系统的设计方法，对模糊PID控制过程和系统调零作了重点的讨论，同时给出了PID控制的程序流程图和系统定长调零子程序。

"I dunno," she answered,"but if you show me aroun', I'll recognize it from the lighthouse just outside the porthole."

"我不知道，"她回答说，"如果你能带我转转，我能认出来的，因为灯塔就在舷窗外。"