调味品行业现状与发展趋势分析(一)

文章综述介绍了调味品行业的总体状况、行业特点和发展趋势;从多角度对不同规模调味品企业发展的商业机遇和不同类别产品的市场拓展途径进行了探讨;提出了开发新型调味产品的几点建议.     

Enhanced transformation of triclosan by laccase in the presence of redox mediators

Triclosan (TCS), an antimicrobial agent, is an emerging and persistent environmental pollutant that is often found as a contaminant in surface waters and sediments; hence, knowledge of its degradability is important. In this study we investigated laccase-mediated TCS transformation and detoxification, using laccase (from the fungus Ganoderma lucidum) in the presence and absence of redox mediators. Transformation products were identified using HPLC, ESI-MS and GC-MS, and transformation mechanisms were proposed. In the absence of redox mediator, 56.5% TCS removal was observed within 24 h, concomitant with formation of new products with molecular weights greater than that of TCS. These products were dimers and trimers of TCS, as confirmed by ESI-MS analysis. Among the various mediators tested, 1-hydroxybenzotriazole (HBT) and syringaldehyde (SYD) significantly enhanced TCS transformation (∼90%). The presence of these mediators resulted in products with lower molecular weights than TCS, including 2,4-dichlorophenol (2,4-DCP; confirmed by GC-MS) and dechlorinated forms of 2,4-DCP. When SYD was used as the mediator, dechlorination resulted in 2-chlorohydroquinone (2-CHQ). Bacterial growth inhibition studies revealed that laccase-mediated transformation of TCS effectively decreased its toxicity, with ultimate conversion to less toxic or nontoxic products. Our results confirmed the involvement of two mechanisms of laccase-catalyzed TCS removal: (i) oligomerization in the absence of redox mediators, and (ii) ether bond cleavage followed by dechlorination in the presence of redox mediators. These results suggest that laccase in combination with natural redox mediator systems may be a useful strategy for the detoxification and elimination of TCS from aqueous systems.     

助剂对CaSO_4载氧体化学链燃烧的影响

在固定床实验台架上,研究了CaSO4和添加助剂的CaSO4与气体燃料发生反应的特性。结果表明:助剂可大幅度地提高CaSO4的反应活性,缩短反应时间。在950℃下,所有复合载氧体的转化率均超过95%。在还原和氧化过程中,载氧体释放的SO2曲线呈单峰特性,且随温度显著增大;温度对COS的释放没有明显的影响作用。含Ni-Fe的载氧体等转化率下硫的损失率最小。通过程序升温还原、X射线衍射和场发射扫描电镜等表征分析,研究了样品的反应性能,成分与结构变化,并提出了一个可能的催化还原反应和硫释放机制。     

某变电站设备支架倾斜事故分析

某变电站地基条件相对较差,且存在膨胀土.设备支架地基原本采用CFG桩复合地基处理,但施工单位将CFG桩改为大直径桩,且人工成孔,设备基础施工完成后约半年,当设备安装完毕试送电时发现,设备基础周边地面有裂隙,支架倾斜,文中通过分析事故原因,进而讨论CFG复合地基处理的机理,并提出相应解决方案.     

复合苦荞粉通便作用的研究

通过对小鼠做通便药效试验,研究复合苦荞粉的通便作用。以小鼠为试验对象,随机分为5组,即空白对照组、模型对照组和复合苦荞粉低、中、高3个剂量组。采用复方地芬诺酯灌胃建立小鼠便秘模型,通过测定小肠推进率、首次排黑便时间、排黑便粒数以及排黑便质量,判断复合苦荞粉对小鼠肠道蠕动和排便功能的影响。在连续灌胃14 d后,高剂量组小鼠的墨汁推进显著高于模型对照组(p0.05);高剂量组的小鼠排黑便粒数高于模型对照组,呈极显著差异(p0.01),低、中剂量组的排黑便粒显著高于模型对照组(p0.05);各剂量组的排黑便质量均极显著高于模型对照组(p0.01);而首次排黑便时间各剂量组与模型组之间无显著差异。复合苦荞粉能有效增强肠道蠕动并促进排便,改善便秘。     

热稳定剂在全钢载重子午线轮胎胎面胶中的应用

研究两种热稳定剂SL-9090和HS-80在全钢载重子午线轮胎胎面胶中的应用。结果表明:在胎面胶中加入热稳定剂,胶料的门尼粘度减小,硫化速度减慢,抗硫化返原性提高,且与热稳定剂用量呈正比,加入2份热稳定剂HS-80的胶料抗硫化返原性最好;硫化胶的物理性能变化不大,生热相当,其中加入3份热稳定剂SL-9090的胶料耐高温性能最优。     

反舰导弹红外复合制导电子干扰评估方法研究

本文首先分析了电子干扰对抗反舰导弹的工作原理及方法,在分析红外复合制导反舰导弹作战使用的基础上,通过建立多维度指标体系描述电子干扰对反舰导弹干扰能力。采用综合评估方法对电子干扰对抗红外复合制导进行评估,给出的相关结论对提高电子干扰对抗反舰导弹作战能力具有指导意义。     

Microstructure and thermal behavior of Sn-Zn-Ag solders

The microstructure and thermal behavior of the Sn-Zn-Ag solder were investigated for 8.73–9% Zn and 0–3.0% Ag. The scanning electron microscopy (SEM) analysis shows the Ag-Zn compound when the solder contains 0.1% Ag. X-ray diffraction (XRD) analysis results indicate that Ag₅Zn₈ and AgZn₃ become prominent when the Ag content is 0.3% and above. Meanwhile, the Zn-rich phase is refined, and the Zn orientations gradually diminish upon increase in Ag content. The morphology of the Ag-Zn compound varies from nodular to dendrite structure when the Ag content increases. The growth of the Ag-Zn compounds is accompanied by the diminishing of the eutectic structure of the Sn-9Zn solder. Differential scanning calorimetry (DSC) investigation reveals that the solidus temperature of these solders exists at around 198°C. A single, sharp exothermic peak was found for the solders with Ag content less than 0.5%. Liquidus temperatures were identified with the DSC analysis to vary from 206°C to 215°C when the Ag content ranges from 1.0% to 3.0%     

基于汉语分词的信息抽取技术

随着信息时代的到来，如何将大量无序的信息及时准确地提取、整理、组织成便于查询检索的形式，巳成为研究开发的焦点。尤其是随着互联网技术的高速发展，为用户提供了更加丰富的信息。将基于汉语自动分词的综合信息抽取技术应用于信息检索，具有实际应用意义和价值。     

李世忠，王国宏，吴 巍，苏少涛

在强对抗条件下雷达/红外双模复合制导跟踪中,雷达采用间歇工作方式可以减少敌方导弹拦截概率和电子支援措施锁定概率。文中在导弹复合制导跟踪中提出了一种雷达间歇工作下的雷达与红外序贯滤波融合算法,该算法针对雷达、红外量测时间不一致的特点,采用顺序处理结构的多传感器集中式融合方法对目标进行跟踪,在跟踪中使用了基于交互多模型和扩展卡尔曼(IMM-EKF)的序贯滤波方法,利用滤波过程中的状态估计协方差与测量误差方差进行比较控制雷达间歇工作。该算法可以自动适应雷达间歇工作,不需要在单/双传感器跟踪模式之间切换,最后通过仿真的方法分析了传感器数据率和雷达间歇工作对跟踪精度的影响。