超微粉碎技术在葡萄籽加工中的应用

葡萄籽具有极高的营养价值和药用价值.为充分利用葡萄籽中的功能性成分,对葡萄籽的清洗、干燥、杀菌、冷冻和超微粉碎等工艺进行了研究.结果表明:葡萄籽超微粉的最佳工艺条件为:40℃下干燥2h→-20℃下冷冻30min→以40g/kg的比例加入微晶纤维素→混合后粉碎25min.采用该工艺获得的葡萄籽超微粉的颗粒直径为2.5～22.5μm,平均直径为6.2μm,而葡萄籽细胞的直径为15.0～32.5μm,平均为24.9μm,说明细胞破壁率达到了100%.     

水泥固化铅污染土的碳化机理及碳化度评价

为了探究水泥固化处理重金属污染场地在碳化作用下的微观结构演变规律及碳化度表征指标,选取典型加速碳化7d后的铅污染土试样进行分析.采用X射线衍射、电镜扫描和热重分析等测试方法,分析了碳化作用对矿物成分、铅的赋存形态、孔隙分布特征及孔隙溶液pH值的影响规律.结果表明:固化重金属污染土中Pb主要以硅酸盐、氢氧化物等化学沉淀的...     

由General Chemistry的译名说起

本文提出我国化学教育中的两点失误原因,其中对General一词翻译有误,也导致了在化学教育中的不利影响,应该予以纠正,重新修订化学专业教学计划和课程设置方案,把化学教学改革推向前进.     

Effect of Ni addition on the glass-forming ability and soft-magnetic properties of FeNiBPNb metallic glasses

The effect of Ni addition on the glass-forming ability (GFA) and soft-magnetic properties of an (Fe1-xNix)75.5B14.5P7Nb3 (x=0-0.6) alloy system were investigated. We found that the addition of Ni was effective in allowing the alloy to approach a eutectic point as well as increasing the thermal stability of the supercooled liquid. By increasing the amount of Ni,the supercooled liquid region (ΔTx),the reduced glass transition temperature Trg (Tg/Tl) and the Y parameter [Tx/(Tg+Tl)] increased from 49 to 75 K,0...     

融合QoS的对等电子服务信誉激励研究进展

在论述对等电子服务信誉激励领域研究科学意义的基础上,分别就对等系统服务质量(QoS)、信誉机制和信誉激励等方面的国外研究现状进行综述,并介绍了国内的相关研究情况,最后对本领域的遗存问题进行了总结.分析认为:对等电子服务信誉机制经过多年研究已经有了一定的进展,但还存在信任定义不一致、缺乏反馈激励、信任模型安全性差、信任模型实现复杂度高等问题亟待解决;因此,对等电子服务QoS评价模型、融合QoS和奖惩措施的双向信任模型、信任模型安全性保证等问题是今后研究的重点和主要方向.     

Negatively and positively charged bacterial aerosol concentration and diversity in natural environments

Bioaerosol charge information is of vital importance for their electrostatic collection. Here, electrostatic means and molecular tools were applied to studying bioaerosol charge dynamics. Positively or negatively charged bioaerosols were collected using an electrostatic sampler operated with a field strength of 1.1 kV cm 1 at a flow rate of 3 L min 1 for 40 min. Those with fewer or no charges bypassing the sampler were also collected using a filter at the downstream of the electrostatic sampler in one environment. The experiments were independently conducted three times in three different environments. The collected bacterial aerosols were cultured directly on agar plates at 26°C, and the colony forming units (CFU) were manually counted. In addition, the CFUs were washed off from the agar plates, and further subjected to polymerase chain reaction (PCR) and denaturing gradient gel electrophoresis (DGGE) for culturable diversity analysis. The results revealed remarkable differences in positively and negatively charged culturable bacterial aerosol concentration and diversity among the studied environments. In the office environment, negatively charged culturable bacterial aerosols appeared to dominate (P = 0.0489), while in outdoor and hotel environments both polarities had similar concentration levels (P = 0.078, P = 0.88, respectively). DGGE patterns for positively charged culturable bacterial aerosols were shown strikingly different from those of negatively charged regardless of the sampling environments. In addition, for each of the environments positively charged culturable bacterial aerosols collected were found to have more band pattern similarity with those positively charged for respective regions of agar plates than those negatively charged, and vice versa. The information developed here is useful for developing efficient electrostatic sampling protocols for bioaerosols.     

论建筑企业施工安全管理

目前施工企业并没有把安全管理放到重要位置,只注重效益.然而没有安全就没有效益.文章论述了安全管理与施工企业的关系及重要性,旨在明确抓好安全管理,以引起同行的重视.     

High-Pressure Experimental Studies on Geo-Liquids Using Synchrotron Radiation at the Advanced Photon Source

We review recent progress in studying silicate, carbonate, and metallic liquids of geo-logical and geophysical importance at high pressure and temperature, using the large-volume high-pressure devices ...     

赏乐杂谈

赏乐如读书，如赏诗、赏画，懂得熟赏、精赏才能体会赏乐之乐。