现代固态发酵技术工艺、设备及应用研究进展

介绍了固态发酵及影响固态发酵过程的主要工艺条件,阐述了固态发酵各种反应器类型,讨论了固态发酵技术在生物转化、生物燃料、生物防治、垃圾处理和生物修复等方面的应用.     

破乳+Fenton试剂法处理高浓度废乳化液的研究

采用破乳-Fenton试剂法对机械厂磨床车间废乳化液进行处理(原水CODcr=290000mg／L，BOD5=28000mg／L)。结果表明：使用合适的破乳药剂，破乳后废水的CODcr去除率达到97．8％；之后投加适量的Fenton试剂进行氧化处理，最终出水CODcr为684mg／L；BOD5／COD由0．094增至0．47，可生化性大大提高。     

A study of structural determinants in the interleukin-1 fold

The structures of interleukin-1ß, basic fibroblastgrowth factor and Erythrina trypsin inhibitor have been analysedin order to determine whether the hydrophobic core remains conserved,even when the structures have extremely low sequence similarities.We find that there are significant differences in the way eachprotein achieves a satisfactory arrangement of core residuesand that positions which contribute to the core of one structureare not guaranteed to contribute to the integrity of another.Furthermore, the side-chain packing arrangements of these coreresidues vary significantly between the three structures. Duringthis analysis the side-chain rotamers for three independentlydetermined interleukin-1ß structures were also compared.It was found that although buried residues are generally inagreement the remaining residues frequently occupy differentrotamers in the three structures. This suggests that althoughmeaningful studies are possible for buried side-chains the resultsobtained from equivalent analyses of accessible residues shouldbe treated with caution. These results are discussed with specificreference to the optimization of side-chain packing in proteinsof known structure.     

搬运机械手PLC操控

介绍PLC对搬运机械手的控制方式,重点阐述系统硬件及软件的设计。     

Task-wise attention guided part complementary learning for few-shot image classification

Science China Information Sciences -     

H形柱传统弱轴连接抗震性能的有限元分析

为研究H形柱传统弱轴连接节点的抗震性能,对已有缩尺试验进行了有限元模拟和8个足尺模型的有限元模拟分析.通过与缩尺试验模型相同尺寸的有限元模型对试验进行了模拟,两者吻合较好.并且对8个足尺有限元模型结果的分析和对比,得出了该种连接的抗震延性、塑性转动能力等相关结论.并给出了对该种连接不足之处的一些改进建议.     

Effects of Al:Si and (Al + Na):Si ratios on the properties of the international simple glass,part II: Structure

High-alumina containing high-level waste (HLW) will be vitrified at the Waste Treatment Plant at the Hanford Site. The resulting glasses, high in alumina, will have distinct composition-structure-property (C-S-P) relationships compared to previously studied HLW glasses. These C-S-P relationships determine the processability and product durability of glasses and therefore must be understood. The main purpose of this study is to understand the detailed structural changes caused by Al:Si and (Al + Na):Si substitutions in a simplified nuclear waste model glass (ISG, international simple glass) by combining experimental structural characterizations and molecular dynamics (MD) simulations. The structures of these two series of glasses were characterized by neutron total scattering and ²⁷Al, ²³Na, ²⁹Si, and ¹¹B solid-state nuclear magnetic resonance (NMR) spectroscopy. Additionally, MD simulations were used to generate atomistic structural models of the borosilicate glasses and simulation results were validated by the experimental structural data. Short-range (eg, bond distance, coordination number, etc) and medium-range (eg, oxygen speciation, network connectivity, polyhedral linkages) structural features of the borosilicate glasses were systematically investigated as a function of the degree of substitution. The results show that bond distance and coordination number of the cation-oxygen pairs are relatively insensitive to Al:Si and (Al + Na):Si substitutions with the exception of the B-O pair. Additionally, the Al:Si substitution results in an increase in tri-bridging oxygen species, whereas (Al + Na):Si substitution creates nonbridging oxygen species. Charge compensator preferences were found for Si-[NBO] (Na⁺), ^[3]B-[NBO] (Na⁺), ^[4]B (mostly Ca²⁺), ^[4]Al (nearly equally split Na⁺ and Ca²⁺), and ^[6]Zr (mostly Ca²⁺). The network former-BO-network former linkages preferences were also tabulated; Si-O-Al and Al-O-Al were preferred at the expense of lower Si-O-^[3]B and ^[3]B-O-^[3]B linkages. These results provide insights on the structural origins of property changes such as glass-transition temperature caused by the substitutions, providing a basis for future improvements of theoretical and computer simulation models.     

Atomistic simulations of functionalization of aramid fiber-epoxy nanocomposite

Owing to its high degree of crystallinity and orientation, the surface of aramid fiber is smooth, causing its low bonding strength with polymer matrix. This has restricted the application of aramid fiber in reinforced polymer materials. Effective methods are by introducing functional groups through surface modification and by increasing its surface roughness thereby greatly improving its bonding strength with the polymer. In this work, molecular dynamics (MD) simulation study fiber functionalized with hydroxyl (OH), carboxyl (COOH), and the silane coupling agent as nanofillers for polymer nanocomposites. The interfacial characteristics and the mechanical behavior of polymer nanocomposites are investigated. The results show that the functionalization can enhance the interfacial shear stress and tensile strength. The functional group not only provides a stronger interface, but also provides additional mechanical interlocking effect, which effectively improves load-bearing transmission capacity. The analysis of the micro-mechanism from the energy level also provides new insights for the functionalized design of nanocomposites.     

耐热铝合金Al-Fe-V-Si高温熔剂的研制

采用自制的熔剂研究了在高温熔炼时对耐热铝合金Al-Fe-V-Si熔体的保护.实验结果表明,在1 200℃保温1h,没加任何熔剂覆盖,对熔体质量影响严重.采用Na3AlF6 NaCl KCl CaF2组成的熔剂效果最好,它兼顾了覆盖和精炼的效果,又具有环保、经济等特点,是一种比较理想的熔剂.     

基于云环境下一种小文件传输策略研究

基于互联网的文件传输策略将直接影响到文件传输效率和网络资源的使用效率,这一情况在各种资源集中的云计算环境表现得更为明显,特别是当传输大量小文件时尤为突出。针对这种现状,提出了一种基于打包策略的文件传输策略,给出了文件包优化处理机制,基于该策略,文件传输之前对小文件进行打包处理,然后进行传输,在接收端收到文件时首先进行解包再进行存储,从而减小传输过程中大量的IO操作,提升文件传输效率。大量的实验表明了本文所提策略的正确性,能够极大地提升云环境下小文件的传输效率,提高云资源的利用率。