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THE STUDY IN DIFFUSION MECHANISM BY VORONOI POLYHEDRON IN SODIUM TETRA-SILICATE MELT voronoi多面体在四硅酸钠熔体中的扩散机理研究
Pub Date : 2021-10-01 DOI: 10.18173/2354-1059.2021-0046
Lich Duong Thi, San Luyen Thi, Yen Nguyen Hai
Molecular dynamic simulation is carried out for Sodium tetra-silicate (NS4) melt at 1873 K and pressure of 0.1 MPa. The diffusion mechanism of Na atoms is investigated in terms of Voronoi polyhedron around network former and displacement of Na atoms between them. The simulation shows that Na atoms are not uniformly distributed through polyhedrons, but they mainly gather in nonbridging oxygen (NBO) and free oxygen (FO) polyhedrons. More than 75.22% of total Na atoms are place in NBO polyhedrons, although the number of NBO polyhedrons is only 22.27%. The two motion types give mainly contribution to Na diffusion: hopping of isolated Na atom or collective displacement. During 150 ps, the system comprises two separate regions: Na-poor regions formed by Si-O subnets and Na-rich regions formed by O2 clusters. The two regions have strongly different chemical composition, the density of Na atoms as well as motion type of Na atoms.
在1873 K和0.1 MPa压力下,对四硅酸钠(NS4)熔体进行了分子动力学模拟。从Voronoi多面体周围的网络形成和Na原子之间的位移角度研究了Na原子的扩散机理。模拟结果表明,Na原子在多面体中不是均匀分布的,而是主要聚集在非桥氧(NBO)和自由氧(FO)多面体中。尽管NBO多面体的数量仅为22.27%,但总Na原子的75.22%以上位于NBO多面体中。两种运动类型对Na的扩散起主要作用:孤立Na原子的跳变和集体位移。在150ps期间,系统由两个独立的区域组成:Si-O子网形成的na贫区和O2簇形成的na富区。这两个区域的化学成分、Na原子的密度以及Na原子的运动类型都有很大的不同。
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引用次数: 0
A NOTE ON GENERALIZED RAINBOW CONNECTION OF CONNECTED GRAPHS AND THEIR NUMBER OF EDGES 关于连通图的广义彩虹连接及其边数的一个注记
Pub Date : 2021-10-01 DOI: 10.18173/2354-1059.2021-0041
Anh Nguyen Thi Thuy, Duyen Le Thi
Let l ≥ 1, k ≥ 1 be two integers. Given an edge-coloured connected graph G. A path P in the graph G is called l-rainbow path if each subpath of length at most l + 1 is rainbow. The graph G is called (k, l)-rainbow connected if any two vertices in G are connected by at least k pairwise internally vertex-disjoint l-rainbow paths. The smallest number of colours needed in order to make G (k, l)-rainbow connected is called the (k, l)-rainbow connection number of G and denoted by rck,l(G). In this paper, we first focus to improve the upper bound of the (1, l)-rainbow connection number depending on the size of connected graphs. Using this result, we characterize all connected graphs having the large (1, 2)-rainbow connection number. Moreover, we also determine the (1, l)-rainbow connection number in a connected graph G containing a sequence of cut-edges.
设l≥1,k≥1为两个整数。给定一个边色连通图G,如果图G中每个长度不超过1 + 1的子路径都是彩虹,则图G中的路径P称为l-彩虹路径。图G称为(k, l)-彩虹连通,如果G中的任意两个顶点通过至少k对内部顶点不相交的l-彩虹路径相连。为了使G (k, l)-彩虹连接,所需的最小颜色数称为G的(k, l)-彩虹连接数,用rock,l(G)表示。在本文中,我们首先关注的是根据连通图的大小改进(1,1)-彩虹连接数的上界。利用这个结果,我们描述了所有具有大(1,2)-彩虹连接数的连接图。此外,我们还确定了包含切边序列的连通图G中的(1,1)-彩虹连接数。
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引用次数: 0
THERMODYNAMIC PROPERTY OF ALLOY FCC-AuCuLi AT ZERO PRESSURE 零压下FCC-AuCuLi合金的热力学性质
Pub Date : 2021-10-01 DOI: 10.18173/2354-1059.2021-0048
Hoc Nguyen Quang, Hien Nguyen Duc
We briefly present the thermodynamic theory of FCC ternary substitutional and interstitial alloy at zero pressure derived by the statistical moment method and apply this theory to alloy AuCuLi. The thermodynamic properties of Au, AuCu and AuLi are specific cases for that of AuCuLi. We compare the thermodynamic properties of alloys AuCuSi and AuCuLi. Our calculated results of thermodynamic quantities for AuCuLi predict and orient experimental results in the future.
本文简要介绍了用统计矩法推导的FCC三元取代间隙合金零压下的热力学理论,并将该理论应用于合金AuCuLi。Au、AuCu和AuLi的热力学性质是AuCuLi的特例。比较了AuCuSi和AuCuLi合金的热力学性能。我们对AuCuLi热力学量的计算结果对未来的实验结果进行了预测和指导。
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引用次数: 0
AN IMPROVED DIJKSTRA ALGORITHM TO FIND MINIMUM TIME PATHS FOR BUS USERS IN HANOI 一种改进的dijkstra算法寻找河内市公交用户的最小时间路径
Pub Date : 2021-10-01 DOI: 10.18173/2354-1059.2021-0049
Giang Vu Thai, Ngan Nguyen Thi Kim, Hoang Nguyen Ba, Duc Bui Minh
In Hanoi, many roads are congested during rush hour. When going through congested roads, the movement of vehicles is very slow. As a result, traveling over a short and congested road may take more time than traveling over a longer and uncongested road. Therefore, in this paper, we study the problem of finding optimal bus routes that take less time, considering the traffic jams. We extend Dijkstra's algorithm to compute waiting time at bus stations and traveling time of buses. The experimental results show that our algorithm is suitable.
在河内,许多道路在高峰时间拥挤不堪。当通过拥挤的道路时,车辆的移动非常缓慢。因此,在短而拥挤的道路上行驶可能比在长而不拥挤的道路上行驶花费更多的时间。因此,在本文中,我们研究了在考虑交通堵塞的情况下,寻找用时最短的最优公交路线的问题。将Dijkstra算法扩展到公交车站候车时间和公交运行时间的计算中。实验结果表明,该算法是可行的。
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引用次数: 0
EQUILIBRIUM VACANCY CONCENTRATION AND THERMODYNAMIC QUANTITIES OF FCC DEFECTIVE ALLOYS AuCuSi AND PtCuSi UNDER PRESSURE AND TEMPERATURE FCC缺陷合金AuCuSi和PtCuSi在压力和温度下的平衡空位浓度和热力学量
Pub Date : 2021-10-01 DOI: 10.18173/2354-1059.2021-0045
V. Le Hong, Hoc Nguyen Quang
We present the analytic expressions of the cohesive energy, the alloy parameters, the equation of state, the mean nearest neighbor distance, the Helmholtz free energy, equilibrium vacancy concentration, and thermodynamic quantities such as the isothermal compressibility, the thermal expansion coefficient, the heat capacities at constant volume and constant pressure for facecentered cubic (FCC) defective ternary substitutional and interstitial alloy ABC derived by the statistical moment method (SMM). The obtained thermodynamic quantities depend on temperature, pressure, the concentration of substitutional atoms, the concentration of interstitial atoms, and equilibrium vacancy concentration. Thermodynamic quantities of FCC defective metal A, FCC defective substitutional alloy AB, and FCC defective interstitial alloy AC are specific cases for thermodynamic quantities of FCC defective ternary substitutional and interstitial alloy ABC. The theoretical results are calculated numerically to alloys AuCuSi and PtCuSi. Our calculated results of thermal expansion coefficient and heat capacities at constant pressure for main metals Au, Pt are in good agreement with experimental data. Our other calculated results for thermodynamic quantities of alloys AuCuSi and PtCuSi at different temperatures, pressure, the concentration of substitutional atoms, and concentrations of interstitial atoms orient and predict new experimental data in the future.
我们给出了黏结能、合金参数、状态方程、平均最近邻距离、亥姆霍兹自由能、平衡空位浓度和热力学量如等温压缩率、热膨胀系数、用统计矩法(SMM)推导了面心立方(FCC)缺陷三元取代间隙合金的恒容恒压热容。得到的热力学量取决于温度、压力、取代原子的浓度、间隙原子的浓度和平衡空位浓度。FCC缺陷金属A、FCC缺陷取代合金AB和FCC缺陷间隙合金AC的热力学量是FCC缺陷三元取代合金和间隙合金ABC热力学量的具体情况。对AuCuSi和PtCuSi合金进行了数值计算。本文对主要金属Au、Pt的恒压热膨胀系数和热容的计算结果与实验数据吻合较好。我们对AuCuSi和PtCuSi合金在不同温度、压力、取代原子浓度和间隙原子浓度下的热力学量的计算结果指向并预测了未来新的实验数据。
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引用次数: 0
STABILITY OF A MATHEMATICAL MODEL DESCRIBING THE COVID-19 PANDEMIC IN TERMS OF THE ENVIRONMENT, SOCIAL DISTANCING AND REINFECTION 从环境、社交距离和再感染的角度描述COVID-19大流行的数学模型的稳定性
Pub Date : 2021-10-01 DOI: 10.18173/2354-1059.2021-0042
Nhu Luong Ngoc, Huyen Lai Thi Ngoc, Giang Vu Thi Huong, Hang Pham Thi
In this paper, we propose and study the stability of a mathematical model for the Covid-19 pandemic incorporating the environment, social distancing and reinfection. A numerical example is carried out to consider the obtained results.
本文提出并研究了考虑环境、社会距离和再感染的新冠肺炎大流行数学模型的稳定性。为考虑所得结果,给出了一个数值算例。
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引用次数: 0
MAPPING MULTI-SCALED LANDSCAPE TYPOLOGY OF LANG SON PROVINCE 谅山省多尺度景观类型学制图
Pub Date : 2021-10-01 DOI: 10.18173/2354-1059.2021-0061
Dung Bui Thi Thanh
The landscape of a territory is generated by natural components, and it is also influenced by human activities. The complexity of factors making up landscape and the relationship between them with humans has created a diverse and complex differentiation of landscape in Lang Son province. Three factors reflecting typical characteristics of Lang Son landscape: Digital Elevation Model (DEM), soil, and land cover have been selected in this study. The concept of multiscaled landscape classification based on the European Landscape Convention (ELC) is applied for combining the holistic with parametric approaches and combining typological with multi-scaled landscape classifications. A number of possible combinations between 9 land cover variables, 9 soil combination variables, and 5 topographic variables have yielded 40 landscape units for Lang Son province. The obtained results are basic documents for contributing to modern and practical landscape research on the one hand, and to territory planning for sustainable development of Lang Son on the other hand.
一个领土的景观是由自然因素产生的,也受到人类活动的影响。构成景观要素及其与人类关系的复杂性,造就了谅山省景观的多样性和复杂分化。本文选取了数字高程模型(DEM)、土壤和土地覆盖3个因子来反映谅山景观的典型特征。采用基于欧洲景观公约(ELC)的多尺度景观分类概念,将整体方法与参数方法相结合,将类型学与多尺度景观分类相结合。9个土地覆盖变量、9个土壤组合变量和5个地形变量之间的多种可能组合得到了谅山省40个景观单元。本文的研究成果,一方面为现代和实用的景观研究提供了基础资料,另一方面也为谅山可持续发展的国土规划提供了基础资料。
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引用次数: 0
THE e e Z l l bb + − − + → →  COLLISION IN THE RANDALL-SUNDRUM MODEL RANDALL-SUNDRUM模型中的e - Z - l - bb +−−+→→→<s:1>碰撞
Pub Date : 2021-10-01 DOI: 10.18173/2354-1059.2021-0047
Giang Bui Thi Ha
Taking account of the Randall-Sundrum model, we have evaluated the influence of model parameters in e e Z l l bb + − − + → →  collision at International Linear Colliders (ILC). In the ILC region, the total cross-section is enhanced at the 125 GeV radion. The total cross-section depends on the polarization of e e − + , initial beams, the radion mass m , the center of mass energy s . Based on the forward - backward asymmetry and the polarization of beams, the reaction can give observable cross-sections based on l l bb − + final state.
考虑到Randall-Sundrum模型,我们在国际直线对撞机(ILC)上评估了模型参数对e - Z - l- bb +−−+→→原子碰撞的影响。在ILC区域,总截面在125 GeV辐射下增强。总横截面取决于e e−+的极化、初始束流、辐射质量m - 、质心能量s。基于光束的前后不对称性和偏振性,该反应可以得到基于l l bb−+终态的可观测截面。
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引用次数: 0
VIETNAMESE Phellinus baumii FRUITING BODY, A POTENTIAL SOURCE OF ANTIOXIDANT AND α-AMYLASE INHIBITORY AGENTS 越南黄柏子实体:抗氧化剂和α-淀粉酶抑制剂的潜在来源
Pub Date : 2021-10-01 DOI: 10.18173/2354-1059.2021-0054
Thuy Mai Phuong, Hong Do Thi, Mai Le Thi Tuyet, Hoa Le Thi Phuong
n-Hexane, ethyl acetate, and butanol fractions from methanol extract of Vietnamese Phellinus baumii fruiting body consisted of phenolics, flavonoids, and terpenoids. Ethyl acetate and butanol fractions showed a high level of total phenolics. Ethyl acetate fractions possessed the highest phenolic content (532.96 ± 19.95 mg GAEg), accounting for approximately 53% fraction dry weight. Free radical DPPH (1,1-diphenyl-2-picrylhydrazyl) scavenging capacity of all fractions correlated with their total phenolic content. Ethyl acetate fraction exhibited the strongest capacity with an IC50 value of 0.059 mgmL, equivalent to nearly 50% of ascorbic acid’s capacity. Its ferric reducing power was off more than half of quercetin and acid ascorbic at the concentration of 0.2 mgmL. Ethyl acetate also had remarkable α-amylase inhibitory activity (IC50= 0.38 mgmL). The results suggested P. baumii fruiting body as a potent source for antioxidative and α-amylase inhibitory compounds.
越南黄连子实体甲醇提取物的正己烷、乙酸乙酯和丁醇组分主要由酚类、黄酮类和萜类化合物组成。乙酸乙酯和丁醇馏分中总酚含量较高。乙酸乙酯组分的酚含量最高(532.96±19.95 mg GAEg),约占组分干重的53%。各组分对自由基DPPH(1,1-二苯基-2-苦味酰肼)的清除能力与其总酚含量呈正相关。乙酸乙酯部分容量最强,IC50值为0.059 mgmL,相当于抗坏血酸容量的近50%。在浓度为0.2 mg / mL时,其对铁的还原能力比槲皮素和抗坏血酸的还原能力低一半以上。乙酸乙酯也具有显著的α-淀粉酶抑制活性(IC50= 0.38 mgmL)。结果表明,鲍氏菌子实体是抗氧化和α-淀粉酶抑制化合物的有效来源。
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引用次数: 0
ASSESSMENT OF THE USE OF DRUG TREATMENT OF DYSLIPIDEMIA AT MILITARY HOSPITAL 105 军队医院血脂异常患者用药评价[j]
Pub Date : 2021-10-01 DOI: 10.18173/2354-1059.2021-0052
Tram Vu Thi, Trang Tran Thi Thu, Cong Vu Thanh, Phu Tran Doan, Binh Tran Quoc, Tuan Truong Quoc, L. Nguyen Ngoc
Dyslipidemia characteristics of outpatients with dyslipidemia for the first time, characteristics of drug use, and effectiveness in controlling dyslipidemia indexes after 3 months of treatment at Military Hospital 105 were studied. A crosssectional, retrospective descriptive study was investigated on adult outpatients who were diagnosed with dyslipidemia for the first time, examined and treated as outpatients at the hospital, and monitored for effectiveness in blood lipid control for 3 months after starting treatment. The decision to use the drug at the start of the study and the achievement of treatment goals at the time points were analyzed based on the ESCEAS 2019 guidelines for treating DL. The majority of patients were aged > 45 years (80.5%), the most common group of patients was aged 46 - 59 (43.7%). The number of patients with comorbidities accounted for 62.8%. 87% of patients had mixed dyslipidemia, 54.8% of patients were in the group with high and very high cardiovascular risk. 93.5% of patients needed to start treatment with drugs based on LDL-C index at the time of treatment initiation. The majority of patients used monotherapy regimens, in which, Statins were used the most in the study sample with the rate of 95.3% in the initial treatment regimen. 70.4% of patients had an inappropriate decision to initiate treatment, of which the most common was the decision to use statins with insufficient dosage in patients (45.1%). Only 28% of patients reached their LDL-C goal after 3 months of treatment. From the high percentage of patients who did not reach the treatment goal in the study sample, it is necessary to consider using stronger statin therapy, higher dose statin, or using another treatment regimen for patients.
对105部队医院首次门诊血脂异常患者的血脂异常特点、用药特点及治疗3个月后对血脂异常指标的控制效果进行研究。采用横断面、回顾性描述性研究,对首次诊断为血脂异常的成人门诊患者,在该院作为门诊患者检查治疗,治疗3个月后监测血脂控制效果。根据ESCEAS 2019治疗DL指南,分析研究开始时使用该药的决定和治疗目标在时间点的实现情况。以年龄> 45岁的患者居多(80.5%),以46 ~ 59岁的患者居多(43.7%)。合并合并症患者占62.8%。87%的患者患有混合性血脂异常,54.8%的患者属于心血管高危和极高危组。93.5%的患者在开始治疗时需要基于LDL-C指数的药物开始治疗。大多数患者使用单一治疗方案,其中他汀类药物在研究样本中使用最多,在初始治疗方案中使用率为95.3%。70.4%的患者有不适当的开始治疗决定,其中最常见的是决定使用他汀类药物剂量不足的患者(45.1%)。治疗3个月后,只有28%的患者达到了LDL-C目标。从研究样本中未达到治疗目标的患者比例较高来看,有必要考虑对患者使用更强的他汀类药物治疗、更高剂量的他汀类药物或使用其他治疗方案。
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引用次数: 0
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Journal of Science Natural Science
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