Highly sensitive electrochemical sensor based on zirconium oxide-decorated gold nanoflakes nanocomposite 2,4-dichlorophenol detection

Journal of Applied Electrochemistry - In this study, a sensitive and selective electrochemical sensor based on a zirconia oxide-decorated gold nanoflake nanocomposite-modified glassy carbon...     

徽派古民居建筑的地域文化特征

徽派建筑是中国古代社会后期成熟的建筑流派,地域文化特征极为鲜明,尤其是作为微州人生存文化最直观载体的古民居建筑,是古代徽州社会历史文化的见证。徽派古民居的选址布局深受徽州风水理论影响,尤其注重水口营造。徽派古民居的内部结构格局生动体现了徽州宗法制度及其观念形态。徽商“商而兼士,贾而好儒”的独特文化品格,成就了古民居内部装饰与陈设的独特艺术魅力。     

捞雷具夹紧机构夹紧力与鱼雷体承载能力的研究

捞雷具用于水下半埋状态实验鱼雷打捞.文中以水下半埋状态鱼雷打捞为研究对象,依据捞雷具工况初步确定了夹紧机构夹紧力,利用薄壳强度理论对鱼雷壳体的强度和稳定性进行了计算,证明了夹紧机构夹紧力的大小是适当的.并利用大型结构分析软件ANSYS,采用有限元方法,对鱼雷壳体的强度进行了计算.根据有限元法获得的计算结果与解析法计算结果相比较,验证了有限元法的可靠性.为捞雷具夹紧机构的结构设计和优化提供了理论依据.     

化工故障诊断中基于遗传算法优化的SOM网络

针对自组织映射神经网络(SOM)启发式训练算法中的缺陷,采用遗传算法SOM中的权重失真指数(LWDI),形成基于遗传算法优化的SOM(GA-SOM)训练算法。将GA-SOM算法应用于化工过程故障诊断,以某工厂甲醇合成反应器故障数据样本为研究对象,研究结果表明,对比基本SOM算法,GA-SOM算法对故障数据能够得到较优的分类辨识结果,且该算法实现简单,便于工程应用,对甲醇合成生产中的故障诊断有非常显著的指导作用。     

Subtle variations in the structure of crosslinked epoxy networks and the impact upon mechanical and thermal properties

Presented here is an investigation of the structure–property relationships of crosslinked networks using three bi-functional glycidyl ether aromatic epoxy resins, two bi-aryl and one tri-aryl, cured with bi- and tri-aryl amines. Subtle changes to the monomer chemistry including changing aromatic substitution patterns from meta to para, methylene to isopropyl and isopropyl to ether were explored. Changing an epoxy resin backbone from methylene to isopropyl enhances backbone rigidity thus increasing glass transition temperature (T_g), yield strength, and strain despite reducing modulus. Changing meta-substitution to para increases T_g and yield strain while leaving strength unaffected and reducing modulus. Changing isopropyl linkages to ether reduces modulus, strength, T_g, and yield strain reflecting increased molecular flexibility. Using three instead of two aromatic rings increases the molecular weight between crosslinks thereby decreasing T_g and yield strain while increasing modulus and strength. Despite the complexities of multiple systems for varying epoxy resins and amine hardeners, the effect upon network properties is explained in terms of short- and long-range molecular and segmental mobility, crosslink density, and equilibrium packing density. © 2020 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2020 , 137, 48874.     

“米邦塔”仙人掌饮料加工工艺研究

以新鲜“米邦塔”仙人掌茎为原料，对仙人掌饮料的加工工艺进行了初步探讨。结果表明在85～90℃的温度下，将仙人掌热烫1min，加入淀粉酶打浆制汁。10％仙人掌原汁中添加0．10％抗坏血酸和0．05％柠檬酸护色．4．5％的白砂糖、0．01％蛋白糖、0．10％柠檬酸、0．01％黄原胶、0．20％海藻酸钠、0．30％柠檬香精以及0．05％山梨酸钾进行调配．可做出色、香、味、形俱佳的仙人掌饮料。     

Polyacrylonitrile‐carbon Nanotube‐polyacrylonitrile: A Versatile Robust Platform for Flexible Multifunctional Electronic Devices in Medical Applications

Flexible multifunctional electronic devices are of high interest for a wide range of applications including thermal therapy and respiratory devices in medical treatment, safety equipment, and structural health monitoring systems. This paper reports a scalable and efficient strategy of manufacturing a polyacrylonitrile‐carbon nanotube‐polyacrylonitrile (PAN‐CNT‐PAN) robust flexible platform for multifunctional electronic devices including flexible heaters, temperature sensors, and flexible thermal flow sensors. The key advantages of this platform include low cost, porosity, mechanical robustness, and electrical stability under mechanical bending, enabling the development of fast‐response flexible heaters with a response time of ≈1.5 s and relaxation time of ≈1.7 s. The temperature‐sensing functionality is also investigated with a range of temperature coefficient of resistances from ?650 to ?900 ppm K^?1. A flexible hot‐film sensing concept is successfully demonstrated using PAN‐CNT‐PAN with a high sensitivity of 340 mV (m s^?1)^?1. The sensitivity enhancement of 50% W^?1 is also observed with increasing supply power. The low cost, porosity, versatile, and robust properties of the proposed platform will enable the development of multifunctional electronic devices for numerous applications such as flexible thermal management, temperature stabilization in industrial processing, temperature sensing, and flexible/wearable devices for human healthcare applications.     

碾压混凝土坝的渗流分析研究

针对碾压混凝土坝渗流特性，采用无厚度缝面单元模拟型进行渗流分析，在不增加网格节点的前提下，不但能高效地刻画出层面和缝面的特点，而且能对具有强透水能力的冷缝或裂缝进行细致的模拟，基本上解决了碾压混凝土坝的渗流建模问题。计算结果表明，采用无厚度缝面单元模型，更加符合坝体的渗流实际情况，提高了求解的精度。     

区块整体调剖技术在濮城油田沙三段油藏的研究与应用

濮城沙三段是典型深层低渗非均质油藏，经多次压裂改造，人工裂缝的形成导致注入水沿裂缝水窜，注入水波及系数大大降低，含水上升速度加快，开发效果变差。应用优化设计技术和PI决策专家系统，通过室内研究，开发出系列高强度微裂缝和大孔道堵剂，并形成油水井配套封堵工艺技术。应用后，注入水波及系数得到提高，油藏开发效果得到有效改善。     

D0C: A code to calculate scalar one-loop four-point integrals with complex masses

We present a new Fortran code to calculate the scalar one-loop four-point integral with complex internal masses, based on the method of 't Hooft and Veltman. The code is applicable when the external momenta fulfill a certain physical condition. In particular it holds if one of the external momenta or a sum of them is timelike or lightlike and therefore covers all physical processes at colliders. All the special cases related to massless external particles are treated separately. Some technical issues related to numerical evaluation and Landau singularities are discussed.