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Effect of Fe-Cr Coating on the Fe-Ga Alloy Functional Properties 铁-铬涂层对铁-镓合金功能特性的影响
Q4 Physics and Astronomy Pub Date : 2023-12-12 DOI: 10.4028/p-mbK4cO
V. Palacheva, V. Cheverikin, D.G. Chubov, Mikhail Yu. Zadorozhnyy, Yulia S. Zhukova, A. Sheveyko, Alexey N. Solonin, Philipp V. Kiryukhantsev-Korneev, I.S. Golovin
Magnetron sputtering with a chromium-containing Fe-19at.%Cr alloy is used to improve the corrosion resistance of Fe-20at.%Ga alloy. The structure of the 2 μm coated layer and distribution of the elements (Fe, Cr, and Ga) are investigated. The bcc phase (A2 structure) is observed in the sputtered sample by XRD analysis. The corrosion resistance in 3.5%NaCl solution increases 14 times in the sample with 2 μm Fe-Cr coated layer. At the same time, the magnetron sputtering leads to a 10% decrease in magnetostriction and a 20% decrease in damping. This difference is explained by schemes of loading during magnetostriction and damping tests.
利用磁控溅射含铬的 Fe-19at.%Cr 合金来提高 Fe-20at.%Ga 合金的耐腐蚀性。研究了 2 μm 涂层的结构和元素(铁、铬和镓)的分布。通过 XRD 分析,在溅射样品中观察到了 bcc 相(A2 结构)。带有 2 μm Fe-Cr 涂层的样品在 3.5%NaCl 溶液中的耐腐蚀性提高了 14 倍。同时,磁控溅射导致磁致伸缩降低了 10%,阻尼降低了 20%。磁致伸缩和阻尼测试期间的加载方案可以解释这种差异。
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引用次数: 0
Development of a 3D Computer Simulation Model Using C++ Methods 用c++方法开发三维计算机仿真模型
Q4 Physics and Astronomy Pub Date : 2023-08-22 DOI: 10.4028/p-5iWtnL
V. Pasternak, A. Ruban, V. Shvedun, Julia Veretennikova
The article presents modelling of spherical elements based on the developed computer model. We recorded the main combinations of spherical particles during filling, which are formed in the hopper. It was found that the most likely combination that occurs when modelling spherical elements consists of three balls. It should be noted that in the cross-section of such a combination passing through the center of the balls, an equilateral triangle is formed. And in the cross-section of the structure, which consists of four spherical balls, a rhombus is formed, if you connect the centers of these spherical elements. It is worth noting that from this formed combination of spherical elements, it can be seen that the rhombus forms two smaller equilateral triangles that fix the process of pushing the spherical balls apart. In turn, the process of pushing spherical elements apart made it possible to fix the contact between spherical elements, as well as to state the stable position of each (individual) particle. This paper also presents the main fragments of encoding the source text of a 3D computer model for modelling spherical elements, which made it possible to optimize the model parameters. It was found that from the obtained data on the distribution of coordination numbers for different volume fillings of spherical elements, it follows that the largest filling was 72 %, which corresponds to the state when 112 lobules have an average coordination number of 3,92.
本文在建立的计算机模型的基础上,对球面单元进行了建模。我们记录了灌装过程中球形颗粒的主要组合,它们是在料斗中形成的。结果发现,最可能的组合发生在建模球形元素由三个球组成时。应该注意的是,在这种组合穿过球中心的横截面中,形成了一个等边三角形。在这个结构的横截面上,它由四个球组成,如果你把这些球的中心连接起来,就会形成一个菱形。值得注意的是,从这种形成的球面单元组合中可以看出,菱形形成了两个较小的等边三角形,它们固定了将球面球推开的过程。反过来,将球面单元分开的过程使得球面单元之间的接触固定,以及每个(单个)粒子的稳定位置成为可能。本文还介绍了球单元三维计算机模型源文本编码的主要片段,为优化模型参数提供了可能。从所获得的球面元不同体积填充的配位数分布数据可以看出,最大填充量为72%,对应于112个小叶的平均配位数为3.92时的状态。
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引用次数: 0
The Effect of Silica Powder Based on Methyltrimethoxysilane and Silica Sand as a Hydrophobic Material 基于甲基三甲氧基硅烷的二氧化硅粉末和硅砂作为疏水材料的效果
Q4 Physics and Astronomy Pub Date : 2023-08-22 DOI: 10.4028/p-agJQ6S
Yuniar Mughayyirah, L. Silvia, M. Zainuri
In this research, a hydrophobic surface has been successfully created using a mixture of silica sand and methyltrimethoxysilane (MTMS) precursor. This research aims to determine the effect of varying the volume of MTMS on the hydrophobic surface. The MTMS as silica precursor was synthesized with Stöber method. The variation used is the volume of the MTMS precursor, while the silica from silica sand is made constant. The volume variation of the MTMS precursor is 9.5 ml, 19 ml, 28.5 ml and 38 ml. The MTMS/SiO2 composite which has been synthesized then get mixed with steel ship paint and coated on the steel plate surface as a topcoat. The MTMS/SiO2 composite was further characterized by X-ray Powder Diffraction (XRD), Scanning Electron Microscopy (SEM), Water Contact Angle (WCA), and Atomic Force Microscope (AFM) which were employed to investigate crystal structure, morphology of particle, hydrophobicity on a surface, and topography of the three-dimensional surface layer respectively. The type of liquid used in the WCA characterization is seawater. XRD characterization results show that silica sand has a quartz phase, MTMS has an amorphous phase and MTMS/SiO2 composite tends to have an amorphous phase. SEM characterization show that the particle size of silica sand that has been mixed with MTMS is around 8 – 20 μm. WCA characterization show that the addition of silica powder on the topcoat increase surface roughness and WCA, so that the steel plate surface has good hydrophobic properties. The highest water contact angle obtained in this research was 109o by seawater.
在这项研究中,使用硅砂和甲基三甲氧基硅烷(MTMS)前体的混合物成功地形成了疏水表面。本研究旨在确定改变MTMS体积对疏水表面的影响。采用斯托伯法合成了作为二氧化硅前驱体的MTMS。所使用的变化是MTMS前体的体积,而来自硅砂的二氧化硅是恒定的。MTMS前体的体积变化为9.5毫升、19毫升、28.5毫升和38毫升。然后将已经合成的MTMS/SiO2复合材料与钢船漆混合并涂覆在钢板表面上作为面漆。通过X射线粉末衍射(XRD)、扫描电子显微镜(SEM)、水接触角(WCA)和原子力显微镜(AFM)对MTMS/SiO2复合材料进行了表征,分别研究了三维表面层的晶体结构、颗粒形态、表面疏水性和形貌。WCA表征中使用的液体类型为海水。XRD表征结果表明,硅砂具有石英相,MTMS具有非晶相,MTMS/SiO2复合材料倾向于具有非晶相中。SEM表征表明,与MTMS混合的硅砂的粒度约为8–20μm。WCA表征表明,在表面涂层上添加二氧化硅粉末可以提高表面粗糙度和WCA,使钢板表面具有良好的疏水性能。在这项研究中获得的最高水接触角是海水的109o。
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引用次数: 0
Effect of In-Plane Stress on the Frictional Behavior of Thin Layers 面内应力对薄层摩擦行为的影响
Q4 Physics and Astronomy Pub Date : 2023-08-22 DOI: 10.4028/p-n2JBjr
N. Menga, G. Carbone
Usually, contact mechanics focus on semi-infinite solids, so that any interaction between normal and in-plane deformation is commonly disregarded. However, when dealing with layers of finite thickness, this assumption is no longer valid, and the specific geometry of the contact pair plays a key role in determining the normal-tangential coupling. In this study, we focus on the exemplar case of a thin deformable layer in frictional sliding contact with a rough profile, where the interplay between tangential friction and normal pressure may lead to significantly different contact behavior compared to the uncoupled case, both in terms of contact area size and frictional response.
通常,接触力学关注的是半无限固体,因此通常忽略法向变形和平面内变形之间的任何相互作用。然而,当处理有限厚度的层时,这种假设不再有效,接触对的特定几何形状在确定法向切向耦合方面起着关键作用。在这项研究中,我们重点研究了薄可变形层与粗糙轮廓摩擦滑动接触的示例情况,在接触面积大小和摩擦响应方面,切向摩擦和法向压力之间的相互作用可能导致与非耦合情况相比显著不同的接触行为。
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引用次数: 0
Unbound Excitonic Properties in a Multilayered Quantum Dot under Hydrostatic Pressure and Temperature 静水压力和温度下多层量子点的非束缚激子性质
Q4 Physics and Astronomy Pub Date : 2023-08-22 DOI: 10.4028/p-ufLk2M
M. Hbibi, O. Mommadi, S. Chouef, R. Boussetta, M. Chnafi, L. Belamkadem, A. El Moussaouy, C. M. Duque, C. A. Duque, F. Falyouni
Taking into account the effective mass approximation and the two-band model, we have studied the combined effects of hydrostatic pressure and temperature on the unbound excitonic properties of a cylinder-shaped quantum dot. The two finite confinement potentials along the radial direction and one finite confinement potential along the axial direction have been considered. We have calculated the electronic energy with and without light hole effect as a function of the core radius, hydrostatic pressure and temperature. The numerical results show that the effect of the confinement potential is dominant over the effect of the hydrostatic pressure and the temperature. Also, the light hole effect on the electronic properties has a significant influence mainly under the external perturbation
考虑到有效质量近似和双频带模型,我们研究了静水压力和温度对圆柱形量子点非束缚激子性质的综合影响。考虑了两个沿径向方向的有限约束势和一个沿轴向方向的有限限制势。我们已经计算了有和没有光空穴效应的电子能作为核心半径、静水压力和温度的函数。数值结果表明,约束势的影响大于静水压力和温度的影响。此外,光空穴效应对电子性质的影响主要是在外部扰动下
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引用次数: 0
Viscoelastic Adhesion and Friction in Sliding Contacts 滑动接触中的粘弹性粘附与摩擦
Q4 Physics and Astronomy Pub Date : 2023-08-22 DOI: 10.4028/p-840lJl
G. Carbone, N. Menga
We present our recent study on adhesive contacts of viscoelastic materials sliding against rigid substrates. Ultimately, the theory addresses the combined effect of viscoelasticity and adhesion in sliding contacts, with specific focus on the sliding frictional behavior. Compared to the adhesiveless case, we show that a significant enhancement of hysteretic friction occurs in the presence of adhesion, in agreement with long-standing experimental evidence. The presented formulation allows to investigate the effect of sliding velocities ranging from extremely slow to very high, thus taking into for local viscoelasticity, occurring at the edges of the contacts (crack tips), and bulk viscoelasticity, occurring in the bulk deformable material.
我们介绍了我们最近对粘弹性材料在刚性基底上滑动的粘性接触的研究。最终,该理论解决了滑动接触中粘弹性和粘附的综合效应,特别关注滑动摩擦行为。与无粘性的情况相比,我们表明,在存在粘性的情况下,滞回摩擦显著增强,这与长期的实验证据一致。所提出的公式允许研究从极慢到极高的滑动速度的影响,从而考虑到发生在接触(裂纹尖端)边缘的局部粘弹性和发生在大块可变形材料中的大块粘弹性。
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引用次数: 0
Quantum Technologies, Defect Identification and Materials Research 量子技术、缺陷识别和材料研究
Q4 Physics and Astronomy Pub Date : 2023-08-22 DOI: 10.4028/b-pxan60
Steven Y. Liang, V. Andronov, Y. Otrosh, Abdelaaziz El Moussaouy, Agustinus Agung Nugroho, Chafic-Touma Salame
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引用次数: 0
Hierarchical Structure of SiO2 by In Situ Modification Combining Quartz Sand and Methyltrimethoxysilane 石英砂与甲基三甲氧基硅烷原位改性SiO2的层次结构研究
Q4 Physics and Astronomy Pub Date : 2023-08-22 DOI: 10.4028/p-2jVrNK
L. Silvia, Lana Awathifi, Yuniar Mughayyirah, M. Zainuri, D. Darminto
SiO2 were successfully synthesized by sol–gel process via in-situ modification. The SiO2 consists of two kinds of co-precursor namely raw material from quartz sand and methyltrimethoxysilane (MTMS) as main SiO2 source. By introducing SiO2 with different sizes of particle micro-submicron scale, it was suggested to construct hierarchical structure. The sample was characterized by X-Ray Diffraction (XRD), Scanning Electron Microscope (SEM), and Atomic Force Microscope (AFM) to analyze crystal structure, morphology of particles, and surface roughness of the samples. In this research, SiO2 co-precursor from quartz sand were extraction and synthesis to be SiO2 quartz (SQ) phase and SiO2 amorphous (SA) phase respectively which is combine with SiO2 based MTMS by sol–gel process via in-situ modification. Based on the results, it can be concluded that SiO2 with high purity levels maintains its crystal structure even after in-situ modification, resulting in an increase in particle size to approximately 12-20 μm. SEM images showed that particle was irregular shape due to agglomeration which is SiO2 based quartz sand stick by SiO2 based MTMS. AFM showed the surface roughness of MTMS/SQ have a larger roughness than MTMS/SA with Sa 3.3 ± 0.8 nm and Sq 5.0 ± 1.0 nm. The formation of hierarchical structure layers based on SiO2 has a promising potential for wide applications in various fields such as hydrophobic surface.
通过原位改性,采用溶胶-凝胶法制备了SiO2。SiO2由石英砂原料和以甲基三甲氧基硅烷(MTMS)为主要SiO2源的两种共前驱体组成。通过引入不同粒径的SiO2颗粒,提出构建层次化结构。采用x射线衍射(XRD)、扫描电镜(SEM)和原子力显微镜(AFM)对样品进行了表征,分析了样品的晶体结构、颗粒形貌和表面粗糙度。本研究从石英砂中提取SiO2共前驱体,分别合成SiO2石英(SQ)相和SiO2非晶(SA)相,通过原位改性,采用溶胶-凝胶法与SiO2基MTMS结合。结果表明,高纯度SiO2在原位改性后仍保持了原有的晶体结构,晶粒尺寸增大到12 ~ 20 μm左右。SEM图像显示,颗粒因团聚而呈不规则形状,为SiO2基石英砂经SiO2基MTMS粘接而成。AFM结果表明,MTMS/SQ的表面粗糙度比MTMS/SA大,SA为3.3±0.8 nm, SQ为5.0±1.0 nm。基于SiO2的分层结构层的形成在疏水表面等各个领域具有广阔的应用前景。
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引用次数: 0
Synthesization and Photocatalytic Activity Evaluation of Float-Type g-C3N4 Microtubes 漂浮型g-C3N4微管的合成及其光催化活性评价
Q4 Physics and Astronomy Pub Date : 2023-08-22 DOI: 10.4028/p-XnUv8Q
K. Nanakida, Dang-Trang Nguyen, K. Taguchi
Float-type g-C3N4 microtubes were created by hydrothermal method and calcination using g-C3N4. Substances after hydrothermal synthesis and float-type g-C3N4 microtubes were investigated by XRD and SEM. The photocatalytic activity of float-type g-C3N4 microtubes was evaluated by methylene blue decomposition. According to these results, the substance, such as a needle, was found to have the same crystal structure as g-C3N4. In addition, it was confirmed that the needle-like substance was hollow inside, according to the SEM result. This substance can float on water. Therefore, Float type g-C3N4 microtubes can receive more light, and the decomposition rate has increased compared to g-C3N4.
采用水热法和煅烧法制备了漂浮型g-C3N4微管。通过XRD和SEM研究了水热合成后的物质和漂浮型g-C3N4微管。通过亚甲基蓝分解评价了漂浮型g-C3 N4微管的光催化活性。根据这些结果,发现诸如针的物质具有与g-C3N4相同的晶体结构。此外,根据SEM结果,确认针状物质内部是中空的。这种物质可以漂浮在水上。因此,Float型g-C3N4微管可以接收更多的光,并且与g-C3N4相比,分解速率有所提高。
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引用次数: 0
Computer Simulation Modeling of an Inhomogeneous Medium with Ellipse-Shaped Irregular Elements 含椭圆异形元的非均匀介质的计算机模拟
Q4 Physics and Astronomy Pub Date : 2023-08-22 DOI: 10.4028/p-lp6Pjp
V. Pasternak, A. Ruban, Vita Hurkalenko, A. Zhyhlo
The article substantiates the main possibilities of filling with irregular bodies, and provides a visual analysis of the parameters formed as a result of structures. It was found out that the form factor acts as the main indicator of the characteristic parameter of changes in the structure and all other parameters of an inhomogeneous medium. It was also found out that when filling a container with irregular ellipsoid elements, the conditions for non-opening (one-way contact) must be met. The obtained calculations of the form factor show the minimum value of the average coordination number of an inhomogeneous medium. This allows us to assert and predict reliable modelling results (± 2-3%). It is also important that the developed simulation model for modelling an inhomogeneous medium using an irregular (ellipsoid) shape of elements can significantly reduce the time spent on conducting field experiments, as well as simulate irregular elements with different shape factors.
本文论证了不规则体填充的主要可能性,并对结构所形成的参数进行了直观分析。研究发现,形状因子是反映非均匀介质结构变化特征参数及其他参数的主要指标。还发现,在填充不规则椭球元容器时,必须满足非开启(单向接触)条件。所得的形状因子计算结果显示了非均匀介质的平均配位数的最小值。这使我们能够断言和预测可靠的建模结果(±2-3%)。同样重要的是,所开发的使用不规则(椭球)形状元素模拟非均匀介质的模拟模型可以显着减少进行现场实验所花费的时间,并且可以模拟具有不同形状因素的不规则元素。
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引用次数: 0
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Defect and Diffusion Forum
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