一次性医用防护服研究进展

针对我国目前医用防护服发展现状,系统综述了近几年我国一次性医用防护服的重要性能和标准。阻隔性、抗菌性、抗静电性是一次性医用防护服的重要性能,可以通过如涂覆整理剂、纤维改性等工艺对其性能进行提升。医用防护服的性能标准在不断地完善和细化,但对于便捷和舒适性能的要求仍有欠缺。纺织基柔性传感器在实现医用防护服智能化上具有广阔的应用前景,但制备成本、使用效率和传感器服用性等问题仍是巨大的挑战。     

FGH96合金惯性摩擦焊过程飞边形成的规律研究

基于FGH96合金的材料本构模型以及摩擦因数随温度的变化关系,利用DEFORM软件建立了FGH96合金惯性摩擦焊的热力耦合分析模型,研究了焊接过程中飞边的形成与温度及材料流动之间的关系. 结果表明,在摩擦焊初期,由于温度与材料流动速度较低,飞边不易形成;当焊接过程达到稳态后,随着摩擦界面及其附近区域材料向摩擦界面两边界流动速度的增加,飞边形成并逐渐增大;飞边的尺寸大小以及弯曲程度随初始转速以及轴向压力的增加而增大,基于飞边形貌确定了FGH96合金惯性摩擦较合理的焊接工艺参数.      

应用“酶切连接”克隆法构建TALEs

TALEs是在植物病原菌黄单胞杆菌(Xanthomonas)上发现的一类天然的DNA结合蛋白,其重复域已经成为模块化构建单元,用于人工DNA结合蛋白的构建。人工TALEs能够用于多种基因工程操作,包括转录调节和基因组编辑。为了在常规分子生物学实验室稳定、经济地构建TALE-TFs和TALENs,本文采用TALE Toolbox试剂盒,运用PCR扩增和"酶切-连接"克隆法构建人工TALEs。结果表明,该构建策略是一种快速高效构建TALEs的方法,能够在1周内完成TALEs构建。     

贵州黄平铁厂沟铝土矿床沉积特征

通过对黔东南黄平铁厂沟铝土矿区大井、包老及鞭炮厂三个剖面沉积特征进行研究,发现大井剖面中以砾石、豆粒结构为主,致密块状构造少见,反映其形成环境为靠近河流入湖处;包老剖面广泛发育致密状与碎屑状铝土矿韵律,两者之间呈突变接触关系,说明其形成于靠近河道的湖岸环境或河流的漫流或片流入湖环境,为间歇性供给的产物;鞭炮厂剖面中以致密状铝土岩(矿)为主,揭示其形成于水体宁静的较深湖环境.三条剖面沉积特征反映成矿时古地理格局为北高南低的态势,成矿物质由河流从研究区北部带入湖泊或入湖口堆积成矿,因此,研究区北部是找铝土矿的优势区域.     

复压复烧对预合金钢粉烧结材料性能的影响

通过在预合金钢粉中加入C等元素,采用模压-烧结和复压复烧2种方法制备粉末冶金低合金钢,并对其密度、显微组织、力学性能和断口形貌进行分析。研究结果表明:对于添加质量分数为0.8%C的合金粉末,用普通压制-烧结法制备的样品密度最高为7.15 g/cm3,抗拉强度为406 MPa;而用复压复烧法制得的样品密度可达7.53 g/cm3,抗拉强度为611 MPa,伸长率也有很大提升;复压复烧法制得的样品孔隙较少且圆滑平直化,断口分布有大量的韧窝,因此,合金的强度和塑性均较高。     

双核配合物[La_2(C_(10)H_8N_2O_4)_2(C_(10)H_9N_2O_4)_2(H_2O)_4]·3H_2O·C_6H_6的合成、晶体结构和生物活性

目的研究新合成的镧(Ⅲ)与N-(2-异丙酸)-邻羟基苯甲酰腙(C10H10N2O4,简称H2L)配合物的晶体结构及其生物活性。方法单晶培养用溶剂扩散法,结构用单晶衍射仪测试,生物活性用盆栽活体试验。结果得到了一个新的双核镧配合物的单晶,该晶体属三斜晶系,P-1空间群,晶胞参数a=0.908 19(19)nm,b=1.233 2(3)nm,c=1.325 1 nm,α=104.157(4)°,β=99.312(4)°,γ=108.911(3)°,Z=2,Dc=2.038 g/cm3,μ=2.504 mm-1,F(000)=789,最终偏差因子R1=0.040 1,wR2=0.106 2,GOF=1.016。配合物对小麦条锈病菌和白菜黑斑菌有较好的抑制效果,并对作物具有助长作用。结论新芳酰腙镧配合物晶体的制得为配位化学、稀土化学增添了新的内容,其良好的生物活性为其在农业上的应用提供了依据。     

构建有机实践教学体系立体化培养创新能力

介绍将实践教学整合成为一个有机的体系，并与理论教学融合，使其能针对学生个体的不同对学生进行全方位培养的一些思考。我们就这些设想提出了自己的一些观点。     

Effect of NaNO<Subscript>3</Subscript> concentration on anodic electrochemical behavior on the Sb surface in NaOH solution

The effect of NaNO₃ concentration on the anodic electrochemical behavior of antimony in 4 M NaOH solution was investigated using cyclic voltammetry (CV) and electrochemical impedance spectroscopy (EIS) analyses. The mechanism of NO₃- concentration effect on the anodic electrochemical behavior of antimony was proposed, and its availability was confirmed by experimental results. The effect of NaNO₃ on the anodic behavior of antimony in NaOH solution can be interpreted as a stepwise formation of different antimony compounds with different NaNO₃ concentrations. Metallic antimony is apt to be oxidized into Sb₂O₃ within the NaNO₃ concentration range of 0-0.48 M. NaSbO₃ can be found on the antimony surface when the NaNO₃ concentration increases gradually. Insoluable NaSbO₃ inhibits the anodic oxidation of antimony due to its shielding effect on the mass transport of the reactants and products. Surface morphology and composition were analyzed by X-ray photoelectron spectroscopy (XPS), scanning electronic microscopy (SEM), and electron dispersion spectroscopy (EDS) analyses. Results indicate that the anodic oxidation layer is composed of Sb₂O₃, NaSbO₃, and Sb. The atomic proportion of antimony in the form of NaSbO₃ increases with increasing NaNO₃ concentration due to the powerful oxidizing property of NaNO₃.     

建筑师勒·柯布西耶的建筑风格评析

勒·柯布西耶是现代建筑运动的激进分子和主将 ,也是二十世纪最重要的建筑师之一。本文通过对其具有代表性的建筑作品的评析 ,阐明了其多变、新奇的创作风格     

Hydrogen storage properties of MgH2 co-catalyzed by LaH3 and NbH

To improve the hydrogen storage properties of Mg-based alloys, a composite material of MgH2 + 10wt%LaH3 + 10wt%NbH was prepared by a mechanical milling method. The composite exhibited favorable hydrogen desorption properties, releasing 0.67wt% H2 within 20 min at 548 K, which was ascribed to the co-catalytic effect of LaH3 and NbH upon dehydriding of MgH2. By contrast, pure MgH2, an MgH2 + 20wt%LaH3 composite, and an MgH2 + 20wt%NbH composite only released 0.1wt%, 0.28wt%, and 0.57wt% H2, respectively, un-der the same conditions. Analyses by X-ray diffraction and scanning electron microscopy showed that the composite particle size was small. Energy-dispersive X-ray spectroscopic mapping demonstrated that La and Nb were distributed homogeneously in the matrix. Differential thermal analysis revealed that the dehydriding peak temperature of the MgH2 + 10wt%LaH3 + 10wt%NbH composite was 595.03 K, which was 94.26 K lower than that of pure MgH2. The introduction of LaH3 and NbH was beneficial to the hydrogen storage performance of MgH2.