调幅接收机由变频级，中频放大级，检波和自动控制带路，和低频放大电路构成。中频放大级电路时指变频输出至检波之间的电路，其性能的优劣直接影响到收音机的灵敏度，选择性和频率特性等指标因此本设计对中频放大电路做了比较详细的介绍。
2022-05-21 18:11:27
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Pin in Paste 和 Press Fit 两种PCB焊接或组装工艺示例, Pin in Paste是一种使用回流焊工艺焊接通孔元器件的工艺，Pin in Paste 是一种无焊锡组装工艺：压接
2022-05-17 11:20:35
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MECAT is an ultra-fast Mapping, Error Correction and de novo Assembly Tools for single molecula sequencing (SMRT) reads. MECAT employs novel alignment and error correction algorithms that are much more efficient than the state of art of aligners and error correction tools. MECAT can be used for effectively de novo assemblying large genomes. For example, on a 32-thread computer with 2.0 GHz CPU , MECAT takes 9.5 days to assemble a human genome based on 54x SMRT data, which is 40 times faster than the current PBcR-Mhap pipeline. We also use MECAT to assemble a diploid human genome based on 102x SMRT data only in 25 days. The latter assembly leads a great improvement of quality to the previous genome assembled from the 54x haploid SMRT data. MECAT performance were compared with PBcR-Mhap pipeline, FALCON and Canu(v1.3) in five real datasets. The quality of assembled contigs produced by MECAT is the same or better than that of the PBcR-Mhap pipeline and FALCON. Here are some comparisons on the 32-thread computer with 2.0 GHz CPU and 512 GB RAM memory:
2022-05-09 15:52:17
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表面组装技术(Surface Mount Technology，SMT)是现代电子产品先进制造技术的重要组成部分。它是将片式化、微型化的无引线或短引线表面组装元件／器件(简称SMC／SMD)直接贴、焊到印制电路板表面或其他基板的表面上的一种电子组装技术。将元件装配到印刷(或其他基板)上的工艺方法称为SMT工艺。相关的组装设备则称为SMT设备。
表面组装技术内容包括表面组装元器件、组装基板、组装材料、组装工艺、组装设计、组装测试与检测技术、组装测试与检测设备等，是一项综合性工程科学技术。它将传统的电子元器件压缩成为体积只有几十分之一的器件，从而实现了电子产晶组装的高密度、高可靠、小型化、低
2022-05-08 22:15:04
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