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Synthesis of Strontium Substituted Hydroxyapatite Coating on Titanium Via Hydrothermal Method 通过水热法在钛上合成锶取代羟基磷灰石涂层
Pub Date : 2024-07-09 DOI: 10.25073/2588-1124/vnumap.4906
Le Thi Tam, Vu Dao Kien, Ta Quoc Tuan, Le Van Toan, Pham Thi Mai Phuong, Pham Hung Vuong
In this study, strontium substituted hydroxyapatite (SrHA) was successfully deposited onto etched titanium substrates in H2SO4 and HCl solution. The deposition was achieved by hydrothermal method by immersing the substrates in a solution containing Ca(NO3)2.4H2O, NH4H2PO4, and 5% Sr(NO3)2, followed by heating at 200°C for 12 hours. X-ray diffraction (XRD) analysis confirmed that all SrHA coatings exhibited a crystalline hydroxyapatite structure. Field-emission scanning electron microscopy (FE-SEM) revealed that the microstructure of the SrHA coatings exhibited. Bioactivity and in vitro biocompatibility testing of the SrHA-coated titanium substrates using SBF solution and baby hamster kidney (BHK) cells demonstrated positive results.      
本研究成功地在 H2SO4 和 HCl 溶液中将锶取代羟基磷灰石(SrHA)沉积到蚀刻钛基板上。沉积是通过水热法实现的,方法是将基底浸入含有 Ca(NO3)2.4H2O、NH4H2PO4 和 5% Sr(NO3)2 的溶液中,然后在 200°C 下加热 12 小时。X 射线衍射 (XRD) 分析证实,所有 SrHA 涂层都呈现出羟基磷灰石结晶结构。场发射扫描电子显微镜(FE-SEM)显示,SrHA 涂层的微观结构具有以下特征。使用 SBF 溶液和小仓鼠肾脏 (BHK) 细胞对 SrHA 涂层钛基底进行的生物活性和体外生物相容性测试表明结果良好。
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引用次数: 0
Spheric Aberration Evaluation of Thin Lens by Ray Transfer Matrix 利用射线传输矩阵评估薄透镜的球差
Pub Date : 2024-07-05 DOI: 10.25073/2588-1124/vnumap.4946
Bui Xuan Kien
The spheric aberration is one of the optical aberration influencing on the optical quality of the optical system, specially, the objective. In this paper, we poropose to use the rays transfer matrix to evaluate the spheric aberration of the nonparaxial rays. Basing on the element cofiguration of the thin lens, we introduce the rays transfer matrix describing the relation the object’s and image’s heigh from the optical axis. The transverse spheric aberration is numerically observed and compared to that obtained by using the paraxial approximation. The obtained results are discussed to evaluate the spheric aberration of the thin lens, particularly, and the objective, generally.
球差是影响光学系统,特别是物镜光学质量的光学像差之一。本文旨在利用射线传输矩阵来评估非轴向射线的球差。根据薄透镜的元件配置,我们引入了光线传递矩阵,描述了物体和图像距离光轴高度的关系。对横向球面像差进行了数值观测,并与使用准轴向近似方法得到的结果进行了比较。讨论所获得的结果,以评估薄透镜的球差,特别是物镜的球差。
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引用次数: 0
Design and characteristics of contactless small-magnetic-metal detector base on tunnel magnetoresistance sensors in differential circuit 基于差分电路隧道磁阻传感器的非接触式小磁金属探测器的设计与特性
Pub Date : 2024-05-09 DOI: 10.25073/2588-1124/vnumap.4909
Pham Van Thanh, Truong Thi Ngoc Lien, Luyen Van Nam
Unexpected metal pieces are significant problems for food and pharmaceutical manufacturers. Commonly, conventional coil metal detectors are used to detect these metal pieces. However, these detectors can only detect cm-size metal pieces, making it challenging to detect mm-size metal pieces. This paper presents an advanced contactless small-magnetic-metal detector based on tunnel magnetoresistance sensors (TMR). To improve the system's sensitivity, the differential circuit combined with a simple AC-bias lock-in amplifier was designed to reduce the noise of TMR sensors. The sensitivity of this designed detection system is 0.44V/mm with a good linearity of R2=0.82674. The experimental results demonstrate that the fabricated prototype can detect the 100 – μm diameter and 1-mm length metal wire. Due to high sensitivity and low-cost fabrication, this system is promising to apply on the manufacturing lines for detecting unexpected tiny metal pieces.
对于食品和药品生产商来说,意外金属碎片是个大问题。通常使用传统的线圈金属探测器来检测这些金属碎片。然而,这些检测器只能检测厘米大小的金属块,因此检测毫米大小的金属块具有挑战性。本文介绍了一种基于隧道磁阻传感器(TMR)的先进非接触式小磁金属探测器。为了提高系统的灵敏度,设计了结合简单交流偏置锁相放大器的差分电路,以降低 TMR 传感器的噪声。该检测系统的灵敏度为 0.44V/mm,线性度 R2=0.82674 。实验结果表明,制作的原型可以检测直径为 100 - μm 长度为 1 mm 的金属丝。由于灵敏度高、制造成本低,该系统有望应用于生产线,检测意外的微小金属件。
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引用次数: 0
Solvability and Stability of Switched Discrete-time Singular Systems with the Same Switching Rules in Coefficient Matrices 系数矩阵中具有相同切换规则的切换式离散时间奇异系统的可解性和稳定性
Pub Date : 2024-05-09 DOI: 10.25073/2588-1124/vnumap.4926
Ninh Thi Thu
The aim of this paper is to study the problem of solvability and stability for switched discrete-time linear singular (SDLS) systems with the same switching rules in coefficient matrices under Lipschitz perturbation. Firstly, we prove the unique existence of the solution, as well as describe the solution manifold. Secondly, by utilizing a Lyapunov function, we derive certain conditions that guarantee the stability of these systems. Finally, we illustrate our results with an example.  
本文旨在研究在 Lipschitz 摄动下,系数矩阵具有相同切换规则的切换离散时间线性奇异(SDLS)系统的可解性和稳定性问题。首先,我们证明了解的唯一存在性,并描述了解流形。其次,通过利用 Lyapunov 函数,我们推导出保证这些系统稳定性的某些条件。最后,我们用一个例子来说明我们的结果。
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引用次数: 0
Structural Properties of Amorphous Vanadium Pentoxide Under Compression 无定形五氧化二钒在压缩条件下的结构特性
Pub Date : 2024-05-09 DOI: 10.25073/2588-1124/vnumap.4869
Nguyen Thu Nhan
Structural properties of amorphous vanadium pentoxide (V2O­5) under compression investigated by molecular dynamics simulation. The simulated amorphous V2O5 is composed of basic structural units of type VO5, VO6 at low-pressure and VO6, VO7 at high-pressure. These basic structural units connected by vertex-, edge- and face- shared links to form a structural network. The random distribution of atom and void clusters leading to a high degree of disorder in the V2O5 structure. Under compression, the fraction of average vertex-, edge- and face- shared links increased strongly. The number of VCs and VTs also increases as the large voids are divided into smaller voids. Our results also elucidated the decreasing of cross-section and increasing of length in VTs are main causes for increasing ion conductivity of the amorphous V2O5.  
通过分子动力学模拟研究了非晶态五氧化二钒(V2O5)在压缩条件下的结构特性。模拟的非晶态 V2O5 在低压下由 VO5、VO6 类型的基本结构单元组成,在高压下由 VO6、VO7 类型的基本结构单元组成。这些基本结构单元通过顶点、边和面共享链接连接形成结构网络。原子和空穴簇的随机分布导致 V2O5 结构高度无序。在压缩条件下,平均顶点、边和面共享链接的比例大幅增加。随着大空隙被分割成小空隙,VC 和 VT 的数量也在增加。我们的研究结果还阐明了 VT 的横截面减小和长度增加是非晶 V2O5 离子电导率增加的主要原因。
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引用次数: 0
Numerical Analysis of Optical Properties Using Octagonal Shaped Ge15As15Se17Te53 Chalcogenide Photonic Crystal Fiber 使用八角形 Ge15As15Se17Te53 卤化物光子晶体光纤的光学特性数值分析
Pub Date : 2024-05-09 DOI: 10.25073/2588-1124/vnumap.4873
Nguyen Thi Thuy
A novel Ge15As15Se17Te53 chalcogenide-based photonic crystal fiber with an octagonal cladding was designed which exhibits low confinement loss and high nonlinearity. The dispersion properties were investigated over a wide wavelength range of up to 11 µm. Based on preliminary simulation results, three fibers with suitable characteristic quantities are proposed for supercontinuum generation. Among these fibers, fiber #F1 (Ʌ = 3.1 µm, d/Ʌ = 0.3) exhibits all-normal dispersion with a small value of −0.374 ps/[nm.km]. At the same time, the highest nonlinear coefficient of 2876.861 W−1.km−1 at the pump wavelength of 5.45 µm is also found. The #F2 fiber (Ʌ= 4.5 µm, d/Ʌ = 0.3) has anomalous flat dispersion with one zero dispersion wavelength. This fiber has the smallest dispersion and lowest confinement loss values of 0.281 ps/[nm.km] and 1.360×10−9 at 5.7 µm pump wavelength, respectively. With the anomalous dispersion, #F3 fiber (Ʌ = 3.5 µm, d/Ʌ = 0.3) offers a small effective mode area of 20.892 µm2 and a low confinement loss of 4.974×10−8 dB/m at 5.25 µm wavelength. The proposed fibers can be a low peak power, broadband supercontinuum source, suitable for application fields such as optical communication and biomedical sensors.  
设计了一种新型 Ge15As15Se17Te53 氯化物基光子晶体光纤,其包层为八边形,具有低约束损耗和高非线性度的特点。在高达 11 µm 的宽波长范围内对其色散特性进行了研究。根据初步模拟结果,提出了三种具有合适特征量的光纤,用于超连续发生。在这些光纤中,#F1 光纤(Ʌ = 3.1 µm,d/Ʌ = 0.3)的色散完全正常,色散值很小,为-0.374 ps/[nm.km]。同时,在 5.45 µm 的泵浦波长处还发现了最高的非线性系数 2876.861 W-1.km-1。#F2 光纤(Ʌ= 4.5 µm,d/Ʌ = 0.3)具有异常平坦的色散,其中一个波长为零色散。在 5.7 µm 泵浦波长下,该光纤的色散值和禁锢损耗值最小,分别为 0.281 ps/[nm.km] 和 1.360×10-9。由于存在反常色散,#F3 光纤(Ʌ = 3.5 µm,d/Ʌ = 0.3)在 5.25 µm 波长时的有效模式面积小(20.892 µm2),禁锢损耗低(4.974×10-8 dB/m)。所提出的光纤可以成为低峰值功率、宽带超连续光源,适用于光通信和生物医学传感器等应用领域。
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引用次数: 0
Recovering the Heat Distribution on the Surface of a Two-dimensional Finite Slab from Interior Data in the Nonhomogeneous Case 从非均质情况下的内部数据恢复二维有限板表面的热量分布
Pub Date : 2023-12-23 DOI: 10.25073/2588-1124/vnumap.4852
Nguyen Quang Huy, Nguyen Minh Hai
We considered the two – dimensional problem of reconstructing the historical distribution on the surface of a finite slab from interior temperature data in the nonhomogeneous case. The problem is ill – posed.  So, a regularization is essential. Using the integration truncation method, we have got the estimation of the error between the regularized solution and the exact solution in the nonhomogeneous case. Then, we provided a numerical experiment for illustration ofthe theoretically obtained results.
我们考虑了在非均质情况下,根据内部温度数据重建有限板坯表面历史分布的二维问题。这个问题的假设条件很差。 因此,正则化是必不可少的。利用积分截断法,我们估算了非均质情况下正则化解和精确解之间的误差。然后,我们提供了一个数值实验来说明理论上得到的结果。
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引用次数: 0
Static Buckling and Free Vibration Analysis of Aligned CNTs Reinforced Composite Plates  对齐碳纳米管增强复合板的静态屈曲和自由振动分析
Pub Date : 2023-12-23 DOI: 10.25073/2588-1124/vnumap.4876
Pham Dinh Nguyen, Do Thi Thu Ha, Duong Manh Tuan
This work introduces an analysis of the nonlinear buckling and free vibration behavior of polymer plates reinforced with aligned carbon nanotubes using Reddy's third-order shear deformation plate theory and incorporating Theodore von Kármán's geometric nonlinearity. The polymer plates were enhanced with single-walled carbon nanotubes assumed to exhibit either uniform distribution or functionally graded distribution across the thickness. The equations of motion were established through Hamilton’s principle and then solved by the Galerkin method and Airy’s stress function for the composite plates with fully simply supported edges. The investigation focused on assessing the effects of carbon nanotube distribution, volume fraction, and geometrical parameters on the buckling load and fundamental frequency parameters of composite plates through numerical results.
本研究采用 Reddy 的三阶剪切变形板理论,并结合 Theodore von Kármán 的几何非线性,对使用排列整齐的碳纳米管增强的聚合物板的非线性屈曲和自由振动行为进行了分析。假定单壁碳纳米管在整个厚度上呈现均匀分布或功能分级分布,从而增强了聚合物板的强度。通过汉密尔顿原理建立了运动方程,然后通过伽勒金方法和艾里应力函数求解了具有完全简支撑边缘的复合板。研究重点是通过数值结果评估碳纳米管分布、体积分数和几何参数对复合板屈曲载荷和基频参数的影响。
{"title":"Static Buckling and Free Vibration Analysis of Aligned CNTs Reinforced Composite Plates","authors":"Pham Dinh Nguyen, Do Thi Thu Ha, Duong Manh Tuan","doi":"10.25073/2588-1124/vnumap.4876","DOIUrl":"https://doi.org/10.25073/2588-1124/vnumap.4876","url":null,"abstract":"This work introduces an analysis of the nonlinear buckling and free vibration behavior of polymer plates reinforced with aligned carbon nanotubes using Reddy's third-order shear deformation plate theory and incorporating Theodore von Kármán's geometric nonlinearity. The polymer plates were enhanced with single-walled carbon nanotubes assumed to exhibit either uniform distribution or functionally graded distribution across the thickness. The equations of motion were established through Hamilton’s principle and then solved by the Galerkin method and Airy’s stress function for the composite plates with fully simply supported edges. The investigation focused on assessing the effects of carbon nanotube distribution, volume fraction, and geometrical parameters on the buckling load and fundamental frequency parameters of composite plates through numerical results.","PeriodicalId":303178,"journal":{"name":"VNU Journal of Science: Mathematics - Physics","volume":"21 16","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-12-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139162196","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
INFLUENCE OF DOPING Zn ON H2 SENSING CHARACTERISTICS OF NICKEL FERRITE NANOPARTICLES 掺锌对镍铁矿石纳米颗粒 H2 传感特性的影响
Pub Date : 2023-12-23 DOI: 10.25073/2588-1124/vnumap.4847
Dao Thi Thuy Nguyet, Nguyen Phuc Duong, Luong Ngoc Anh
In this paper, the synthesized and testing of H2 gas sensors using nickel zinc ferrite NiFe2O4 and Ni0.5Zn0.5Fe2O4 nanoparticles was shown here. The nickel zinc ferrite nanoparticles were synthesized by chemical co-precipitation combine annealed. Characterization of synthesized powders was made using X-ray diffraction (XRD) and Transmission electron microscopy (TEM) analysis. Nano powder resulting from milling was used to prepare gas sensing elements in pellet form. The gas-sensing properties were studied in presence of hydrogen as test gases. The gas response was found to be strongly influenced by the substitute concentration of Zn. A significant high sensitivity of ~ 90% was found for Zn = 0.5 in presence of 500 ppm H2 at an operating temperature of 250 °C.
本文介绍了使用镍锌铁氧体 NiFe2O4 和 Ni0.5Zn0.5Fe2O4 纳米粒子合成和测试 H2 气体传感器的情况。镍锌铁氧体纳米粒子是通过化学共沉淀结合退火法合成的。使用 X 射线衍射(XRD)和透射电子显微镜(TEM)分析了合成粉末的特性。研磨得到的纳米粉末被用来制备颗粒状的气体传感元件。在氢气作为测试气体的情况下研究了气体传感特性。结果发现,气体响应受锌替代浓度的影响很大。在工作温度为 250 °C、存在 500 ppm H2 的情况下,Zn = 0.5 的灵敏度高达约 90%。
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引用次数: 0
The High Energy Scattering Amplitude One-loop Gravitation in the Effective Field Theory 有效场论中的高能散射振幅一环引力
Pub Date : 2023-12-23 DOI: 10.25073/2588-1124/vnumap.4857
Do Thu Ha, Nguyen Thu Huong
In this work, the Newton potential, together with the low-key corrective energy, an attractive loop of two large non-relativistic masses has been found. The asymptotic behavior of the scattering amplitude for two scalar particles at high energies with fixed momentum transfers was studied in the one-loop gravitation effective field theory.
在这项工作中,牛顿势与低调修正能量一起,发现了两个大非相对论质量的吸引环。在一环引力有效场理论中,研究了两个标量粒子在高能量和固定动量转移条件下的散射振幅渐近行为。
{"title":"The High Energy Scattering Amplitude One-loop Gravitation in the Effective Field Theory","authors":"Do Thu Ha, Nguyen Thu Huong","doi":"10.25073/2588-1124/vnumap.4857","DOIUrl":"https://doi.org/10.25073/2588-1124/vnumap.4857","url":null,"abstract":"In this work, the Newton potential, together with the low-key corrective energy, an attractive loop of two large non-relativistic masses has been found. The asymptotic behavior of the scattering amplitude for two scalar particles at high energies with fixed momentum transfers was studied in the one-loop gravitation effective field theory.","PeriodicalId":303178,"journal":{"name":"VNU Journal of Science: Mathematics - Physics","volume":"20 14","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-12-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139162252","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
期刊
VNU Journal of Science: Mathematics - Physics
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