Development of an innovative apparatus using UV‐C for controlling the number of microorganisms in raw milk after milking

This study was conducted to investigate the effect of UV‐C irradiation on the reduction of microorganisms in raw milk. The experiments were carried out by varying the flow rates of 2, 4 and 7 L/min with 39W and 48W UV‐C. The number of microorganisms was reduced by 4.70 (39W) and 4.60 log₁₀ CFU/mL (48W) at 120 min. With the residence time of 4.95 s and the UV‐C doses of 98 and 109.9 mJ/cm² at 253.74 nm, the reduction of microorganism was clearly observed with no significant influence of different UV‐C power settings on the oxidation of milk fat.     

水法合成扑草净原药废水综合治理工艺研究

扑草净原药生产中水为反应介质,存在废水量大,废水中污染物成分复杂,污染环境。经预处理,离子交换吸附后降低各项污染指标,基本能达标排放,特别是扑灭津,扑草净,COD值都有大幅度下降。     

曲面数据采集及预处理方法

介绍通过分析和运用曲面数字化技术实现曲面数据的采集,并提出了一种进行数据预处理的方法。     

拱桥拆除爆破技术

介绍了桂林旧解放桥的拆除爆破,该桥为5孔36m的双曲拱桥。根据双曲拱桥的特点,在拆除爆破过程中所采取的炮孔布置、起爆网路设计、爆破安全防护措施等技术,为旧桥的拆除爆破积累了成功的经验。     

120m超高塔架式钢结构烟囱定向爆破拆除

介绍了一座120m高钢结构烟囱的定向爆破拆除工程。通过对烟囱自身结构特点及周围环境的分析,合理的选择爆破切口、爆破参数、延时起爆网路及安全防护等技术措施。为了确保起爆后烟囱沿设计方向顺利倒塌,预先对爆破部位钢板进行机械切割预处理,并针对各爆破部位钢板形状设计出相配合尺寸的聚能切割器。爆破拆除的钢结构烟囱倒塌在设计范围内,四周建(构)筑物和设施完好无损。该烟囱的爆破拆除在安全和质量上都达到了预期效果,可为类似爆破工程提供经验。     

大礼堂分体定向倒塌爆破拆除

待拆的钢筋混凝土框架结构大礼堂纵向比横向长度大,高宽比较小,且梁柱截面较大,墙体较厚,如何确保爆破安全使其整体定向倒塌且充分解体,具有一定难度。本文论述了爆破方案的选择,预处理,分体式爆破的炮孔布置及孔网参数,起爆网路设计以及所采取的爆破安全措施。爆破效果非常理想。     

基于图像分析的路面裂缝检测识别系统

当公路路面开裂后,及时对路面裂缝进行维护才能有效降低公路的维护成本、提高公路的使用寿命。开发路面裂缝的检测识别系统不仅降低公路维护成本,而且可以防止意外发生,保护人身安全。首先,对图像进行预处理,目的是消除图像上的干扰裂缝识别的噪声。然后对图像进行检测识别,在图像上标记出裂缝准确区域,通过EXCEL保存试验所提取的裂缝参数信息。本系统通过使用Matlab软件编写程序实现整个图像裂缝识别过程。仿真实验结果表明,本系统能有效识别路面裂缝,大大效降低工人养护路面的成本和效率。     

A comparative study on pretreatment methods and dimensionality reduction techniques for energy data disaggregation in home appliances

Energy meters provide valuable information that can be used to determine important features such as energy consumption of electrical devices and consumption habits in corporate, residential or public institutions. This information is crucial to establish energy saving strategies. With this aim, different approaches have been proposed in the literature, including non-intrusive load monitoring techniques, which enable the energy disaggregation of appliances and devices through a centralized measurement taken at panel level using a metering infrastructure. Generally, the accuracy of these techniques increases as more information is available on the analyzed signals or through subsequent post-computed values. Active power, reactive power, or even current harmonics measurements can be used for this task. However, the use of these and other recently proposed power and current features increases the dimensionality and, therefore, the complexity of the algorithms involved in the disaggregation process. Therefore, it is necessary to apply advanced techniques to reduce the dimensionality of the data, as well as the possible linear dependence between variables. This paper compares the performance of 8 data pretreatment methods and 6 dimensionality reduction techniques to data retrieved by an advanced metering infrastructure in a real environment consisting of 10 different home appliances. Results obtained from the comparative analysis show that the information provided by raw data can be enhanced by using pretreatment techniques and dimensionality reduction methods, especially when a custom combination of active power and current harmonics measures is considered.     

Distillation vs. membrane filtration: overview of process evolutions in seawater desalination

The worldwide need for fresh water requires more and more plants for the treatment of non-conventional water sources. During the last decades, seawater has become an important source of fresh water in many arid regions. The traditional desalination processes [reverse osmosis (RO), multi stage flash (MSF), multi effect distillation (MED), electrodialysis (ED)] have evoluated to reliable and established processes; current research focuses on process improvements in view of a lower cost and a more environmentally friendly operation. This paper provides an overview of recent process improvements in seawater desalination using RO, MSF, MED and ED. Important topics that are discussed include the use of alternative energy sources (wind energy, solar energy, nuclear energy) for RO or distillation processes, and the impact of the different desalination process on the environment; the implementation of hybrid processes in seawater desalination; pretreatment of desalination plants by pressure driven membrane processes (microfiltration, ultrafiltration and nanofiltration) compared to chemical pretreatment; new materials to prevent corrosion in distillation processes; and the prevention of fouling in reverse osmosis units. These improvements contribute to the cost effectiveness of the desalination process, and ensure a sustainable production of drinking water on long terms in regions with limited reserves of fresh water.     

高硅铝铸件镀前浸锌液的研究

为了获得结合力好的镀层,利用XRF(x射线荧光能谱)对高硅铝合金浸锌前预处理进行了研究,筛选了适用于高硅铝合金的化学除油、碱蚀、出光溶液;测试了14种浸锌溶液第一次浸锌60s、第二次浸锌30s后所得膜层的厚度、组成成分.从中筛选了效果很好的浸锌溶液.