单片机在自动称量机中的应用

介绍自动称量机控制系统软硬件结构、工作原理、动态精度及速度调正.     

Performance of differential phase shift keying maritime laser communication over log-normal distribution turbulence channel

Laser communication is essential part of maritime-terrestrial-air intelligent communication/sensor network. Among them, different modulation formats would play a unique role in specific applications. Based on Rytov theory, we discussed system performance of the maritime laser communication with repeated coding technology in several modulation schemes. The closed-form expression of average bit error rate(BER) from weak to moderate atmospheric turbulence described by log-normal distribution is given. Differential phase shift keying(DPSK) modulation, as a potential solution for future maritime laser communication, has attracted a lot of attention. We analyzed the effects of atmospheric turbulence parameters(visibility, refractive index structure coefficient, non-Kolmogorov spectral power-law exponent, turbulence inner scale) and DPSK system parameters(receiver aperture diameter, repeat time) on average BER in detail. Compared with the aperture-averaging effects, the system BER can be well suppressed through increasing repeat time. This work is anticipated to provide a theoretical reference for maritime laser communication systems.     

Optical adaptive filtering for Doppler shift simulator

Based on free space laser communication, this article describes the working principle of electro-optical frequency shifting, designs an optical adaptive filtering module, and builds the core module of the dynamic optical Doppler shifting simulator for laser channel. It is expected to be applied to the heaven-ground integrated communication link. In this article, we adopt the electro-optical frequency shifting technique combined with the microwave-light wave. In the 1 550 nm band, the negative feedback algorithm is used to complete the adaptive filtering, which realizes optical Doppler frequency shifting and high-precision locking. The frequency shift range reaches +5.5—+32 GHz, and the analog precision is better than 645 Hz. When the microwave frequency is greater than 13.5 GHz, the signal-to-noise ratio (SNR) of the output optical power reaches 20 dB, which lays the foundation for the next stage space laser communication.     

浅谈无粘结预应力混凝土板施工质量控制

本文结合工程实际,对无粘结预应力混凝土板(后张法)施工技术的优点及应用进行了分析及探讨。     

太阳能在厦门公寓中的设计与应用

简述了厦门市半山公寓太阳能与建筑一体化设计与应用项目的过程情况。结合具体实例对热水集热器在屋顶的具体布置进行研究,说明了集热器的位置确定与集热器的选择方法。用太阳能加热低温热水（〈100℃）,是目前该行业热门的研发课题。探讨并指出,太阳能热水系统与建筑的一体化亦是应该进行研究的课题之一。     

皮革涂饰用乳化蜡的制备(I)--提高蜡的分散细度和乳液稳定性

本文在提高蜡的分散细度和乳液稳定性等方面进行了研究。采用低能乳化工艺，经过微乳液转相法，制备出乳液粒子细小均匀、稳定性好的以石蜡为主体成分的皮革涂饰用乳化蜡。     

酯基型双子季铵盐的合成及其性能研究

本文设计合成了系列含有不同疏水尾链长度和间隔基长度的酯基型双子季铵盐QAS(n+m),n和m分别表示间隔基长度和疏水尾链长度。通过红外光谱(FT-IR)、核磁共振氢谱(¹H-NMR)和质谱(MS)对产物结构进行了鉴定。并借助于电导率法和微量肉汤稀释法分别研究了其表面活性和抑菌活性。结果表明：增加疏水尾链和间隔基的长度可提高QAS(n+m)的表面活性;QAS(n+m)对革兰氏阳性菌(金黄色葡萄球菌)和革兰氏阴性菌(大肠杆菌)均表现出较强的抑菌活性,且对金黄色葡萄球菌的抑菌活性强于大肠杆菌。     

制革中复鞣剂的应用与研究进展

复鞣是制革的一个重要工序,复鞣剂的特性在很大程度上决定了成品革的感官和应用性能。本文按合成高分子鞣剂、天然高分子鞣剂和矿物鞣剂进行分类,归纳总结了近年研究和应用较多的10余种皮革复鞣剂,并概述和评价了它们各自的结构-性能特点、复鞣机理、最新研发进展及应用性能的优缺点。目前,赋予皮革高物性和功能性的生态友好型皮革复鞣剂仍是研发和应用热点;而且随着无铬鞣市场需求的扩大,与之配套的复鞣和加脂材料还比较匮乏,这些将形成未来皮革业发展新的竞争点。     

等离子体化学与皮革工业

简要介绍等离于体的基本概念和特征，着重阐明等离子体化学的特点及其在皮革制造、皮革化工及皮革污染治理中应用的原理和可能性。     

制革工业中的绿色革命——可持续发展战略问题

本文论述了中国皮革工业走可持续发展之路的必要性。概述了国内外同行及作者在制革清洁工艺方面的研究成果，提出了制革工业绿色革命的方向。