Emerging functional nanomaterials for the detection of food contaminants

Along with the progress in nanoscience, a variety of advanced functional nanomaterials were constructed to develop effective and innovative analytical techniques for food safety surveillance. In this review, we summarized the advanced analytical methods that have been developed based upon advanced functional nanomaterials, including plasmonic nanomaterial-based colorimetric methods, fluorescent nanomaterial-based fluorescent methods, advanced functional material-based molecular imprinting technology, advanced functional material-based chromatographic methods, plasmonic nanomaterial-based surface enhanced Raman scattering technology, and advanced functional material-based electrochemical methods. This review provides a progressive roadmap for further development of portable, rapid, and in situ detection technology to promote food safety surveillance from bench to market and eventually reduce the gap between research in the laboratory and industrial applications.     

不同厂家川芎配方颗粒中阿魏酸含量的比较

目的:考察不同厂家川芎配方颗粒中阿魏酸的含量。方法:采用高效液相色谱法。色谱柱:Diamonsil C18柱(4.6 mm×250 mm,5μm);流动相:乙腈-1%冰醋酸(20:80,V/V);流速:1.0 mL·min-1;检测波长:320nm;柱温:30℃,进样量为10μL。结果:阿魏酸在14 ng~280 ng范围内线性关系良好(r=0.9999),平均回收率为99.71%(RSD=2.06,n=5)。不同厂家川芎配方颗粒中阿魏酸的含量为0.05~0.32 mg·g-1。结论:不同厂家产品中阿魏酸的含量差异显著。     

富硒酵母对薏米酒醪品质的影响

目的：探究富硒酵母对薏米酒醪品质的影响。方法：以薏米为原料，接种富硒酿酒酵母制备薏米酒醪，测定酒醪发酵过程中理化特性、植物活性成分及体外抗氧化活性的变化。结果：相比酿酒酵母组，酿酒酵母富硒组可增加薏米酒醪发酵中期（12~30 h期间）酒精度的提升速率，加速pH和总糖含量的下降速率。发酵36 h后，酿酒酵母富硒组中总黄酮和总多酚含量分别比酿酒酵母组增加了14.43%和9.77%。此外，发酵36 h后，酿酒酵母组中硒含量仅为0.007 μg/mL，而酿酒酵母富硒组中硒含量可达20.53 μg/mL，且薏米酒醪的DPPH自由基清除率和脂质过氧化抑制率分别提高至67.37%和79.52%。结论：富硒酵母发酵薏米酒醪不仅可使酒醪富含硒元素，还能提高酒醪的体外抗氧化活性，提升酒醪品质。     

节理岩体中特大断面小净距隧道施工与监测

结合工程概况,对魁岐2号特大断面小间距隧道工程的施工和监测方法进行了介绍,对节理岩体中特大断面小间距隧道的施工和监测技术进行简要分析,以供类似工程借鉴和参考。     

国产双压区双网压滤机的改进及应用

介绍了国产双压区双网压滤机的原理及结构,通过对比说明新型双压区双网压滤机在浓缩方面节能效果显著,有推广应用的价值。     

小模数塑料齿轮传动噪声及成型品质改进研究

采用模具CAE技术,运用一次因子法和田口正交试验法进行模拟实验,计算信噪比优化工艺参数减小翘曲变形量,改善塑料齿轮的传动品质.通过实际生产并对制品进行检测,结果表明：制品成型精度有所提高,对降低齿轮传动噪声有一定作用,该方法切实可行.     

高职院校《计算机应用基础》课程改革的探索

针对当前《计算机应用基础》课程改革所面临的形势,结合实际分析讨论,提出了以培养学生能力为导向的课改思路,并介绍了主要的课改措施与实施步骤。     

基于TrustZone的安全应用性能优化

TrustZone technology has been widely used in the security protection of various smart systems, such as data encryption, fingerprint login, DRM protection, electronic payment and so on. TrustZone technology provides programs with a trusted execution environment (TEE) that is isolated from the host environment to provide the runtime protection for important code and data. Therefore, the calling process of the security application based on TrustZone has changed, then the application adds processes such as data sharing and messaging between the secure and non-secure worlds, which causes additional performance overhead. This paper locates four key elements that affect the performance of the security application: world switch, interrupt, shared memory management, and data copy. On this base, four corresponding performance optimization methods are proposed. Through the AES encryption ser- vice based on TrustZone technology, the proposed performance optimization methods were compared and tested to verify their effectiveness. Experimental results show that: 1. Setting parameters reasonably can improve the performance by 31% at most. 2. Masking external interrupts can improve the perfor- mance by 4.5% at most. 3. Memory reusing can improve the performance by 37% at most. 4. Reducing memory copy can improve the performance by 39% at most.     

校园无线局域网的安全策略研究

简要介绍了校园无线局域网,详细探讨了校园无线局域网的安全策略。     

Redetermination of the Eutectic Composition of the Ni-P Binary Alloy

A series of Ni-P alloys (Ni-rich) have been synthesized and solidified. It is found that the solidification microstructure of the Ni-19.0 at.%P alloy that has long been regarded as the eutectic composition contains many primary phase dendrites besides rod eutectics. In contrast, only rod eutectic microstructure appears in the samples of Ni-19.6 at.%P, and this alloy shows the lowest end temperature of melting among all the compositions investigated. The results indicate that the actual eutectic composition at the Ni-rich part of the Ni-P system is Ni-19.6 at.%P. The eutectic temperature is determined to be about 1163 K by the differential scanning calorimetry analysis.