基于PIC18F4580的粮食称重系统设计

在粮食品质检测分级过程中,为了测量样品的含杂率和容积密度,设计了一种高精度称重系统。以PIC18F4580为主控单元,采用四臂电桥式负荷传感器,用AD7799进行模数转换及传感器微弱信号的放大。差动式输入参考电压减小电源低频漂移时带来的系统误差。实际测试表明,系统测量重复误差不超过0.005%,系统非线性度误差小于0.007%,可以满足粮食检测过程的需求。     

Demonstration of performance enhanced pre-spectrum sliced seed light for low-cost seeded WDM–PON architecture

We proposed and demonstrated high efficient pre-spectrum sliced seed lights (PS-SL) for serving low-cost seeded wavelength division multiplexing passive optical network (WDM–PON). The PS-SLs reused backward amplified spontaneous emission light which were generated by an Erbium doped fiber amplifier (EDFA) to improve output characteristics. The power, flatness and bandwidth of seed signal from the proposed PS-SL were sufficient to serve multiple seeded WDM–PON OLTs. We experimentally demonstrated the feasibility of the PS-SL with multiple seeded WDM–PONs over 20 km transmission. In addition, the PS-SL was tolerated to these ranges of environmental conditions since no data error was observed after 48 h. We anticipated a considerable reduction in the seed light cost per channel for multiple WDM–PONs because the seed light cost was shared by multiple WDM–PON OLTs.     

膜生物反应器处理油脂废水的研究

采用膜生物反应器对油脂废水进行强化处理.试验结果表明:膜生物反应器对油脂废水中的化学需氧量(COD)、油、总有机碳(TOC)、氨氮和生化需氧量(BOD5)的平均去除率分别为85.2％、93.8％、88.4％、51.3％和97.5％,相应的平均出水含量为233.6、310.1、95.7、3.9 mg/L和22.6 mg/L;氨氮和BOD5达到国家污水综合排放一级标准(GB 18918-2002).在考察膜通量对膜污染的潜势中发现,随着膜通量的提高,跨膜压差(TMP)增加的较快,通过将膜通量降低到8 LMH以下,TMP得以稳定,维持在2～6 kPa之间.     

A comparative investigation on the corrosion degradation of plasma sprayed YSZ and LnMgAl11O19 (Ln = Nd,Sm, Gd) coatings exposed to the molten V2O5 + Na2SO4 salt mixture at 1100 °C

Corrosive attack of the molten 50 wt. % V₂O₅ + 50 wt.% Na₂SO₄ salt mixture has been comparably studied for the APS YSZ and LnMgAl₁₁O₁₉ (LnMA, Ln = Nd, Sm, Gd) thermal barrier coatings upon a 10 h anneal at 1100 °C in air. The YSZ coating suffered from a deepest infiltration of the molten salt along its thickness direction through the open and connected pores as well as inter-lamellae microcracks. A large number of newly formed voids were widely distributed in the YSZ coating due to the corrosion degradation followed by the t, t’ to m-ZrO₂ phase transformation. While, a relative thin corrosion layer mainly consisting of α-Al₂O₃ and LnVO₄ were present for the corroded LnMA coatings. The much reduced number of open pores and connected microcracks together with the rapid chemical reaction between the molten salt and LnMA coatings, especially for the NdMA coating, preventing further infiltration of the molten salt, was beneficial to mitigate further attacks to the inner coating at the expense of sacrificing a thinner top layer. The presences of amorphous phases were thought to further accelerate the corrosion reaction and strengthen such a corrosion protection mode for all the APS LnMA coatings.     

秸秆包装容器成型过程影响因素分析

摘要:论述了我国秸秆资源的现状,介绍了秸秆包装容器成型原理、成型工艺过程,分析了影响包装容器成型的主要因素:原料种类、含水率、粒度、辅料种类、成型压力、成型温度、成型时间等.同时,对成型技术存在的一些问题进行了探讨.     

高静压处理对花生蛋白的改性研究

研究高静压(300 MPa～600 MPa)处理对花生分离蛋白、花生球蛋白的溶解性、乳化性(EAI)、乳化稳定性(ESI)、表面疏水性、巯基含量等性质的影响,并对各功能性质的相互关联性进行了分析。结果表明:高静压处理可有效的改善花生分离蛋白和花生球蛋白的溶解性和乳化性,但是会降低其乳化稳定性。在400 MPa,花生分离蛋白具有最大的乳化性和表面疏水性,花生球蛋白具有最大的溶解性。在500 MPa,花生球蛋白具有最大的乳化性和表面疏水性,花生分离蛋白具有最大的溶解性;随着压力的升高,花生球蛋白和花生分离蛋白的游离巯基含量呈下降趋势。表面疏水性与乳化性存在一定的正相关。结果表明,高静压处理可以有效改善花生蛋白的功能性质。     

蓄冷技术的应用与综合分析

阐述了蓄冷技术在我国的发展现状,以及在冰蓄冷空调和冷链系统中的应用,介绍了2种系统中的蓄冷介质。     

基于PIC18F6527的电磁继电器控制系统

为了实现电磁继电器的实时开关控制,确保人员安全和系统的可靠性,设计了根据倾角传感器的输出电压,以PIC18F6527为核心的继电器智能控制系统,并给出了硬件电路图,程序流程框图和部分源程序.该智能控制系统结构简单,可靠性高,在液压系统的电磁阀控制、电机控制等过程中具有很高的实用价值.     

温度、超声、nisin协同脉冲磁场杀灭枯草芽孢杆菌的研究

本文对温度（50~100 ℃）、超声（200 W,5~30 min）、nisin（100~350 IU/mL）协同磁场强度为3.0 T,脉冲数为30个的脉冲磁场杀灭枯草芽孢杆菌进行了研究。结果表明：先脉冲磁场处理后温度处理时,温度越高,杀菌效果越好,当温度为100 ℃,枯草芽孢杆菌的残留率最低为3.17%;先脉冲磁场处理再采用超声功率800 W,工作5 s间隙10 s的超声处理后,超声总时间越长杀菌效果越好,当超声时间为30 min时,枯草芽孢杆菌的残留率最低为8.18%;先脉冲磁场处理后nisin处理时,浓度越高杀菌效果越好,当nisin终浓度为350 IU/mL时,枯草芽孢杆菌的残留率最低为19.21%;先脉冲磁场处理再温度、超声、nisin处理的杀菌效果比先温度、超声、nisin处理后再脉冲磁场处理的杀菌效果要好,这与扫描电镜的观察结果相吻合。协同杀菌后,枯草芽孢杆菌的形态发生改变,细胞产生萎缩现象,脉冲磁场处理后再用nisin协同处理,枯草芽孢杆菌的内容物出现泄漏。