Subjects: Digital Publishing >> New Media submitted time 2023-10-08 Cooperative journals: 《中国传媒科技》
Abstract：随着时代的发展和科技的进步,3D技术也得到了迅猛的发展,带来了崭新的视觉设计元素。在此影响下,传统的平面艺术设计已经不能再满足市场的正常需要了,它的发展受到了巨大的冲击,另一方面也面临着新的发展机遇。3D风格视觉元素具有许多新的审美特点,能让平面设计的视觉语言变得更加丰富、表现形式更加多元化、感官效能更加立体。[1]通过3D风格视觉元素的运用,创作的作品有突出的个性、强烈的空间感、鲜明的意境、协调有条理的色彩层次,这些特征赋予了平面艺术作品更多的情趣内涵,让平面艺术作品的审美符合人们的需求,让人在视觉上产生共鸣,获得空灵的美感,还能增强人的艺术底蕴,因此3D风格视觉的平面艺术设计创新已经逐渐成为了平面艺术设计的主流,引领着未来平面艺术设计行业的发展。
Subjects: Materials Science >> Materials Science (General) submitted time 2023-03-31 Cooperative journals: 《中国腐蚀与防护学报》
Abstract： Effect of hydrostatic pressure on the electrochemical corrosion of X100 pipeline steel in 0.5 mol/L NaHCO3+0.03 mol/L NaCl solution was investigated by means of methodspotentindynamic polarization, electrochemical impedance spectroscopy and Mott-Schottky. The results show that with the increasing hydrostatic pressure the number and the size of corrosion pits increase, while the activity of ions in the solution also increases, which in turn promotes the adsorpting of Cl- in the passive film. As a result, the corrosion rate and the corrosion current density are increased. The component of the passive film transforms from oxide or hydroxide formed by low pressures to carbonate by high pressures, which may result in the decrease of corrosion-resistance and increase of probability of pitting corrosion nucleation. The passivation film formed on the X100 steel exhibits characteristics of n-type semiconductor. The increase amount of Cl- in the passivation film promotes the increase of lattice imperfections and facilitates the cracking of the oxide film.
Subjects: Materials Science >> Materials Science (General) submitted time 2023-03-31 Cooperative journals: 《腐蚀科学与防护技术》
Abstract： A new imidazoline inhibitor was synthesized using 1-methylimidazole, 1,4-butane sultone and concentrated sulfuric acid as raw materials and then of which the corrosion inhibition on X100 pipeline steel in 5%HCl was examined by means of weight loss method and electrochemical technology. The results showed that the inhibitor is a mixed type inhibitor. The inhibition efficiency increased with the increasing inhibitor concentration, while decreased with the increase of temperature. The activation energy of corrosion and the relevant thermodynamic parameters such as enthalpy, entropy, adsorption equilibrium constants and standard free energy ect were acquired so that to reveal the mechanism of corrosion inhibition. The results showed that the corrosion inhibitor was physically adsorbed on the X100 steel surface.
Subjects: Materials Science >> Materials Science (General) submitted time 2023-03-31 Cooperative journals: 《腐蚀科学与防护技术》
Abstract： Effect of temperature on corrosion behavior of X70 pipeline steel in high pH solution (0.5 mol/L Na2CO3+0.5 mol/L NaHCO3) was studied by means of potentiodynamic polarization, electrochemical impedance spectroscopy and Mott- Schottky measurements. Results showed that the pitting potential, passive current density and the polarization resistance of X70 pipeline steel all decreased with the increase of temperature. In the experimental temperature range, the formed passive film consisted mainly of Fe2O3 and Fe3O4 with features of n-type semiconductor. With the rising temperature, the thickness and donor density of the passive film increased, correspondingly, corrosion tendency of the steel increased. Therefore, the stability of the passive film decreased with the increasing temperature, which weakened the corrosion resistance of the X70 steel.
Subjects: Astronomy >> Astrophysical processes submitted time 2020-04-20 Cooperative journals: 《天文研究与技术》
Abstract： 星载氢原子钟具有频率稳定度高、频率漂移率低的优点，在卫星导航定位和频率计量中得到了广泛应用。星载氢原子钟的腔泡系统用于实现氢原子的量子跃迁及其信号采集，原子跃迁信号幅度直接决定了系统信噪比，进而影响整机性能指标，所以腔泡系统是星载氢原子钟的核心组件。目前,星载氢原子钟腔泡系统主要采用直螺线管来产生原子跃迁所需的C场。由于星载氢原子钟物理部分的结构限制，直螺线管的磁场均匀度有进一步提高的空间。探讨使用多段线圈代替直螺线管用于产生C场的可行性。首先对多段线圈产生的磁场进行理论分析计算，同时使用ANSYS电磁场仿真软件对多段线圈的各项参数进行仿真和优化，包括各段长度、段数、间距以及匝数、内径和总长度等。然后优选磁场均匀度较好的线圈配置参数，可将C场的非均匀度由直螺线管约10%降低到多段线圈约1%。根据仿真优化结果建立了试验九段线圈，对比测试了原子跃迁信号增益，同时结合电路部分进行了闭环测试，对频率稳定度指标进行了对比。实验结果表明,原子跃迁信号可有效提升，阿伦方差在中短稳(1S-1000S)能表现更好。此项工作为星载氢原子钟整机性能指标的进一步提升打下了基础。
Subjects: Materials Science >> Materials Science (General) submitted time 2017-03-31 Cooperative journals: 《金属学报》
Abstract：研究了返温轧制(TRRP)中厚钢板表层的组织特征及其对止裂性能的影响。力学性能测试结果表明，与传统的控轧控冷(TMCP)钢相比，TRRP钢表层的韧、塑性较好，韧脆转变温度低至-100 ℃，而在1/4厚度处，两者性能差异不大。显微组织分析表明，TRRP钢表层组织为等轴状铁素体晶粒+弥散分布的马氏体-奥氏体(MA)组元，晶粒等效直径约2 μm。通过数值模拟分析了TRRP工艺中间坯温度场的变化，发现中间坯冷却时，表层被冷却到相变温度以下，形成以贝氏体为主的组织，返温后轧制，表层组织发生动态再结晶形成超细晶。示波冲击测试表明，TRRP钢表层试样启裂后，载荷-位移曲线斜率绝对值(k)由0.66降低到0.27，与止裂相关的冲击吸收功达到44.3 J，断口表层组织有明显的塑性变形，吸收了裂纹扩展的能量，有效地抑制了裂纹扩展。晶粒取向分析表明，TRRP钢表层超细晶粒取向呈随机分布，晶界角度平均值和大角度晶界(＞15°)比例分别达到32.8°和69.8%，能够有效阻碍裂纹扩展。使用纳米压痕分析了实验钢的硬度，TRRP钢表层的纳米压痕硬度统计分布集中在2 GPa以下，组织特征为少量的硬质相弥散分布在较软的铁素体基体上，相界面处萌生的裂纹在基体中不易扩展。
Subjects: Materials Science >> Materials Science (General) submitted time 2016-11-14 Cooperative journals: 《中国腐蚀与防护学报》
Abstract：采用动电位极化曲线分析了X100和X80管线钢在0.5 mol/L NaHCO3溶液中的极化行为，通过电流密度-时间曲线以及Mott-Schottky曲线考察了两种钝化膜的生长机制和钝化膜的半导体性质，借助电容测量和点缺陷模型(PDM)计算了两种钝化膜内的缺陷密度和缺陷扩散系数。结果表明：两种管线钢在该介质中都存在一个很宽的钝化区间，表面钝化膜的生长均受电迁移和溶解—沉积混合机制控制，钝化膜均为n型半导体。但与X80管线钢相比，X100钢具有更低的自腐蚀电流密度和维钝电流密度，更高的击穿电位。X100管线钢表面钝化膜也更为致密、均匀、稳定，钝化膜的施主密度更低，缺陷扩散系数约是X80管线钢的1/3。因此，X100比X80管线钢表现出更好的抗均匀腐蚀性能和抗点蚀性能。
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