1. 分贝：分贝(decibel) 分贝(dB)为表示相对功率或幅度电平的标准单位. 用dB表示. 满刻度分贝值(dBFS)(dB Full Scale) 指数字音响中以满刻度为基准的分贝值. 满刻度可保证数字录音有最大的录音电平,所有的数字电平皆用dBFS表示.
2. DB的解释
2. 数据库文件：SQL Anywhere中提供了将传统的DBF文件转换为该系统下的数据库文件(DB)中的表的工具. 为了实现这一转换,用户必须先建立一个新的表,再将DBF格式的文件内容导入该表中. 系统将打开指定的文件,将该文件中的所有记录导入新建的表中.
3. DB的翻译
3. 数据总线：2、 据总线(DB data bus) 数据总线(DB)用来在CPU与存储器、输入/输出接口和其它电路之间相互传输数据状态和指令. 由于数据可以从CPU传输到内部存储器、输入、输出接口,也可反方向传输到CPU中,所以数据总线(DB)是双向传输的总线,
4. 公共查询·英语单词大全
4. 地震：ST)商品检验(SN)水利工程建设规程(SL)..(GF)电子(SJ)船舶工程建设规程(CB)石油化工工程建设规程(SH)(SHSG)轻工(SG)水电工程建设规程(SD)水产(SC)商业工程建设规程(SB)城建工程建设规程(CJ)气象(QX)地震(DB)航天(QJ)航空工
5. DB是什么意思
5. db：date-base; 数据库
6. db：dual base; 双基
7. DB
7. db：distributor box; 配电箱
8. db：draw-bar; 连接杆
1. This paper analyses and implements the memory DB model in command and control.
分析了内存数据库的航迹管理模型和指控软件中航迹管理的特点，设计并实现了相应的模型。
2.
2. At the same time, the cutting noise usually outstrips 105dB while cutting.
但是金刚石锯片的切割啸叫声带来了极大的噪声，通常切割噪声达105dB以上。
3. The 3-dB beamwidth of thefar more narrow, at only 23°.
长线天线主瓣（在线轴的28°角上）的3dB射束宽度远比它狭窄，只有 23°。
4. DB的意思
4. A long-wire antenna is increased, a moderate front-to-backratio results, about 3 dB for very long antennas.
当长线的长度被增加，首尾的比例长度适当，那么非常长的天线大概有3dB的增益。
5. The LTC.6412 is a fully differential variable gain amplifier with linear-in-dB analog gain control.
Linear 公司的LTC6412是800MHz模拟控制全差分可变增益放大器，增益控制是线性dB的。
6. First of all, the circuit output waveform in the case of losing it by measuring the input voltage and output voltage in order to detect amplification of analog circuits, and then by adjusting the frequency of AC voltage source to reduce the output gain make 3db analog circuits in order to measure the maximum cut-off frequency, pass band can be obtained.
本电路首先在输出波形不失真的情况下通过测量输入电压和输出电压从而测出模拟电路的放大倍数，然后通过调节交流电压源的频率使得输出增益减少3db从而测量出模拟电路的上限截止频率，即可求出通频带。
7. The design of marketing management network system for a everybody fashions speciality store is described, which is based on DB server/ WB server/ browser mode in this paper.
基于DBServer／WebServer／Browser模式，针对众人时装专卖店，讨论了营销管理网络系统的设计内容，介绍了服务器系统软件、网络结构、开发环境，并给出了整个系统的功
8. The effect in the range from 1% to 4% of graphite, and several thickness of foamglass on reflect effectiveness were studied. As a result of our experiment, we concluded that the RE of foamglass with graphite as vesicant is about -5～-13dB in the range of 8～18GHZ.
实验结果表明，用石墨作发泡剂的泡沫玻璃在8~18GHZ频率范围内具有－5~－13dB的吸波效果，能满足地面目标反雷达伪装的要求。
9. A carrier to noise estimation algorithm is improved, which is more suitable for high sensitivity condition.
实测数据的分析表明，差分相干积分的检测性能平均优于非相干0.75dB左右。
10. DB是什么意思
10. If the sound pressure level exceeds 85 dB, ear protectors must be used when entering the noise area of the machine unit.
如果声压水平超过85dB，则在进入机器单元的噪音区时，必须要使用护耳装备。
11. The thermal resistance can be controlled below 2 ℃/W. The average shear strength of the gold bumps on the BCB surface is around 70 N/mm2. The performances of MMIC and interconnection structure at high frequencies are optimized and tested. The S -parameters curves of the packaged MMIC shift slightly showing perfect transmission character. The insertion loss change after the packaging process is less than 1 dB range at the operating frequency and the return loss is less than –8 dB from 10 to 15 GHz.
同时，对加工完成的封装结构的力学、热学和射频传输性能进行了测试，结果显示：互连金凸点的剪切力达到70 N/mm2，优化后封装结构的热阻可以控制在2℃/W以内，在工作频段内，测试用低噪放大器的S参数变化很小，插入损耗的变化小于1db，回波损耗在10~15GHz的范围内，低于-8db，满足设计要求。
12. The frequency response of the whole measuring chain is therefor better than +/- 1 dB 10 Hz - 20 kHz.
因此整个测试系统的精度好于+/- 1 dB 10 Hz - 20 kHz。
13. Features 240 watts of bi-amped power, UFLC 25mm soft dome HF unit, 200mm LF woofer, separate HF gain control, overall volume control and a 0dB /-3dB /+3dB switch for the LF unit.
音频配备240W的双路功放，UFLC 25mm的高音单元，200mm的低音单元，分别的高音增益控制和整体音量控制。对低音单元还有0dB/-3dB/+3dB的选择开关。
14. DB的意思
14. The linear dynamic range can be reach 90 dB when the frequency is 200 MHz. IV. Isotropic electric field sensor using integrated optical waveguide On the basis of traditional isotropic antenna, a new structure of isotropic electric field sensor with segmented electrodes using optical waveguide is proposed and is founded.
四、集成光波导全向电场传感系统研究本文借鉴传统全向天线的基本原理，提出基于集成光波导分段电极电场传感器的全向电场探头的结构，以及传感系统的结构，建立了相应的数学模型。
15. The experimental results show that the average PSNR of the proposed algorithm can reach 33.5889 dB in IMDB face database, which is higher than that of other methods and the recovery of face image has a better visual effect.
对IMDB人脸库进行了实验对比，结果显示，新方法得到了33.588 9 dB的平均峰值信噪比，高于Baker方法和传统的插值算法，显示出了更好的视觉效果。
16. DB在线翻译
16. The protein spot DB2 protein showed some similarity with serine proteinase inhibitor. It belonged to potato proteinase inhibitor I.
2蛋白质点DB2与丝氨酸蛋白酶抑制剂具有同源性，属于马铃薯蛋白酶抑制剂Ⅰ家族。
17. Based on 0.35μm CMOS technology, three types of pre-equalized optoelectronic integrated receivers are designed by parallel resonant loop peaking technique, third-order ladder network peaking technique, and high-pass filter peaking technique, respectively, where a fingered dual-photodiode is applied with a 40μm×40μm area, a 1.1GHz 3dB bandwidth, and a 0.95pF junction capacitance.
近年来，基于CMOS工艺的收发机研究进展很快[1，2]，0.13μm CMOS技术已经可以做出OC-192(10Gb/s)芯片组[3]，CMOS将成为高速光通信中的主要技术，所以发展与标准CMOS工艺全兼容的单片光电接收机应是主要研究方向之一。
18. Secondly, we examine the COBRA with segmented parabolic reflectors. The design of the reflector is re-expatiated, which is composed of several equivalent parts of parabolic reflector with the same axis and focus. The radiation formulas are deduced with Current Distribution Methods, and the radiation patterns are calculated. The results show that it can produce high-gain circularly polarized field in the boresight direction (the gain is about 30dBi when the diameter of the reflector is 1.3m) and its 3dB bandwidth is 78%. The radiation formulas of TEM coaxial mode as the radiation mode of COBRA are also deduced. At last, a new folding antenna has been put forward and designed.
在COBRA天线方面：重新阐述了反射面的设计公式，该反射面是几块不同焦距抛物反射面的共焦共轴组合；用电流分布法推导了天线的辐射公式并编写了计算程序，利用该程序对天线的辐射方向图和频带宽度进行了讨论，计算表明这种天线可以在轴线上获得高增益的圆极化波(当反射面直径为1.3m时增益为30dBi)，其3dB带宽为78％；推导了同轴TEM模作为COBRA天线馈源时的辐射公式；最后，提出并设计了一种折叠式COBRA天线。
19. DB的近义词
19. For modern communication system, in order to save spectrum resources and boost spectrum efficiency, some kinds of complex digital modulation are used, for example QPSK, QAM, OFDM, which are not constant envelop modulation. Furthermore the peak to average power ratio is very big. Taking WCDMA for example, PAR is 6～9dB at 0.01%probability on the CCDF.
由于现代通信系统为了提高频谱利用率，采用了各种复杂的数字调制技术QPSK，QAM，OFDM，这些都是非恒定包络的调制方式，并且峰值和平均值相差较大，通常功率放大器采用功率回退的方法来达到线性度的提升，但是随着功率的回退，放大器的功率附加效率也会大大的降低。
20. Emphasis has been placed on the safety of your rig with a switchable 40Hz 12dB/octave HPF to increase headroom and independent switchable soft limiting on each of the bands to protect your amp and speakers.
重点放在可控40Hz高通滤波器，增加12dB/octave空间和独立的软切换对每个频带限制，以保护您的功放和扬声器在您的装置的安全。
1. Zhang''s clapping was measured at 108 dB at one performance by the local environment administrative bureau.
2. That was the first investment made by the $ 298 million DB Masdar fund, which was established in January 2010.
3. He said tests show that noise caused by old trains on the line was about 10 dB louder than new ones.
4. A train whistle is about 100 dB, while the sound of an aircraft taking off can reach 130 dB.
5. Lam added that the DB would shoulder the responsibility of coordinating building maintenance.
6. DB also owns rail companies outside Germany and is also a major road transport operator within Germany.