特大值处理对频率计算结果影响分析

为研究特大值处理对频率计算结果的影响,通过对官寨水文站实测资料进行频率计算,对其中一次较大洪水的考虑,采用了不同方法进行处理,再运用皮尔逊Ⅲ型曲线进行配线,得到设计频率下的设计洪水值,并对所得结果进行对比分析,以说明较大洪水视为特大洪水与否对工程设计的影响,从而给水文工程设计者提供较为合理的建议。     

氧化镁复合膨胀剂膨胀性能的温度敏感性研究

为了瀑布沟导流洞工程的封堵,研究了氧化镁复合膨胀剂膨胀效能的温度敏感性和机理.试验表明,活性值相对较高的氧化镁膨胀剂对温度更加敏感,温度增加可明显加剧其膨胀效能;养护温度的升高对活性值较高的氧化镁膨胀剂的水化反应促进作用更大.瀑布沟导流洞封堵混凝土最终采用了一种掺氧化镁膨胀剂的复合膨胀剂,配制的微膨胀泵送混凝土完全满足工作性能、力学件能及耐久性要求.     

复杂河口汊道封堵后有关的潮流和泥沙问题

研究了瓯江南口封堵后有关的潮流和泥沙问题。首先对复杂的瓯江口的自然条件和冲淤演变进行了分析;其次,使用二维波浪潮流泥沙数学模型、波浪潮流泥沙物理模型及三维潮流数学模型等研究手段,对瓯江南口现有潜堤加高进行封堵后的二维潮流场、泥沙场、地形冲淤变化和三维潮流场进行了模拟研究,对瓯江泄洪排涝的影响进行了计算和分析。研究结果表明,从对周围水沙环境和瓯江泄洪排涝的影响角度考虑,将现潜堤加高进行南口封堵的方案是可行的。     

Nitrogen removal from eutrophic water by floating-bed-grown water spinach (Ipomoea aquatica Forsk.) with ion implantation

The aim of this study was to investigate the use of water spinach (Ipomoea aquatica Forsk.) with N(+) ion-beam implantation for removal of nutrient species from eutrophic water. The mutated water spinach was grown on floating beds, and growth chambers were used to examine the growth of three cultivars of water spinach with ion implantation for 14 days in simulated eutrophic water at both high and low nitrogen levels. The specific weight growth rates of three cultivars of water spinach with ion implantation were significantly higher than the control, and their NO(3)-N and NH(4)-N removal efficiencies were also greater than those of the control. Furthermore, compared with the control, the nitrogen contents in the plant biomass with ion implantation were higher as well.     

TiOx/Pd interfacial catalysts with controllable geometrical/electronic effects for industrial H2O2 production

Aiming at controllable modulating metal−support interactions to achieve an optimal trade-off of geometric/electronic effect in supported catalysts, we developed a reliable approach based on the typical 2D material layered double hydroxide (LDHs). A series of TiO_x/Pd/MgTiAl-MMO-X catalysts with adjustable interfacial effect were acquired by loading PdCl₄²⁻ precursor and further preciously adjusting the topological reduction temperature, based on the regulatory effect of Mg–O–Ti–O–Al–O structure in the support on the reducibility and mobility of Ti⁴⁺. The catalysts with semi-continuous and accessible TiO_x/Pd interface, confirmed by AC-HAADF-STEM, CO chemisorption, XPS, exhibit much higher H₂O₂ yield than the catalyst with over-encapsulation structure. The TiO_x/Pd/MgTiAl-MMO-450 catalysts possessed optimal geometric and electronic structure exhibited the highest activity with TOF of 9.75 s⁻¹, excellent H₂O₂ yield of 11.4 g/L, as well as good stability.     

Tunable focus poly(vinyl chloride) gel microlens Array fabricated by shaping in patterned electric field

In this work, we demonstrate a poly(vinyl chloride) (PVC)-gel-based microlens array (MLA) with tunable focus. The MLA is fabricated using a PVC solution and a glass substrate with a ring-array-patterned electrode. By coating the solution on the substrate and applying a direct current (DC) voltage to the electrode, a PVC gel membrane with a convex surface profile on the inner region of the electrode (anode) is formed with the solvent evaporation. After the complete evaporation of the solvent and removing the voltage, the solidified PVC gel membrane exhibits an MLA character. When an inverse DC voltage is applied to the electrode, the PVC gel accumulated on the inner region will shift toward the outer electrode connected to the anode, leading the curvature of the convex surface to decrease and the focal length to increase accordingly. The variable surface profile with voltage is precisely measured by a laser confocal microscope and the result shows that the focal length of the MLA can be tuned within a large range.     

高分子量谷蛋白亚基近等基因系面粉品质及其流变学特性的研究

分析了高分子量谷蛋白亚基近等基因系的高分子量谷蛋白亚基组成，并对该近等基因系进行了品质性状的分析，结果表明：Glu-D1位点的变化比Glu-B1位点的变化对面粉品质和流变学特性影响大；并且同时具有Glu-B1 14 15和Glu-D1 5 10的近等基因系2号无论是面粉品质还是流变学特性都优于其它两个近等基因系8号(null，7 9，5 10)和近等基因系13号(null，14 15，10)；而8号又优于13号，即Glu-B1 14 15的存在没有弥补Glu-D1 5亚基的缺失。     

控制低比例纯涤纶色纺纱外观质量的体会

色纺纱织物具有色泽自然，层次清晰的特殊风格，但色纺纱在纺制过程中容易出现色差、色条等外观疵点，为提高色纺纱外观质量，应从以下几方面着手：合理选配工艺流程，加强色纤维管理，合理使用回花并控制短片段色比不匀，在络筒工序采用上蜡处理的方法改善成纱毛羽，加强操作管理及现场检查，通过采取以上措施，有效改善了色纺纱的外观质量。     

乳发酵过程产生的天然防腐成分

综述了乳酸菌、霉菌和酵母发酵乳过程中产生的天然防腐成分,并分类论述了生物合成途径和抑菌机理,对乳发酵过程中产生的天然防腐成分的进一步应用提供了理论基础。