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ESTIMATION OF THE REAL AREA OF AU NANOPARTICLES OVER HOPG USING ELECTROCHEMICAL TECHNIQUES 利用电化学技术估计金纳米颗粒在hopg上的实际面积
IF 0.3 Q4 PHYSICS, MULTIDISCIPLINARY Pub Date : 2021-07-15 DOI: 10.31527/analesafa.2021.32.2.48
A. Fuentes, A. Herrera, L. Avalle, E. Santos
The metallic electrodes show a high affinity for the electroadsorption processes of hydrogen and/or oxygen in acid solutions, so it is possible to characterize them by electrochemical techniques. In the present work the electroreduction of oxygenated species will be used to estimate the real areas of the electrodes designed with Au nanostructures in HOPG at different times of deposition. The results allow to conclude that Au nanostructures in HOPG can reach important electroactive areas. That is to say that despite their nanometric sizes they have a great capacity to experience the transfer of charge.
金属电极对氢和/或氧在酸溶液中的电吸附过程具有很高的亲和力,因此可以用电化学技术对其进行表征。在本工作中,将使用氧化态的电还原来估计在不同沉积时间用金纳米结构设计的HOPG电极的实际面积。结果表明,金纳米结构在HOPG中可以到达重要的电活性区域。也就是说,尽管它们只有纳米大小,但它们具有很大的电荷转移能力。
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引用次数: 0
ELECTRICAL POTENTIAL BETWEEN NON-PARALLEL FLAT ELECTRODES – SIMULATION OF A CELL USED WITH TOMATO 非平行扁平电极间的电位-番茄细胞的模拟
IF 0.3 Q4 PHYSICS, MULTIDISCIPLINARY Pub Date : 2021-07-15 DOI: 10.31527/analesafa.2021.32.2.43
A. Hemsy
The equipotential lines of the field generated by the cell used in dielectric measurements of whole fruit tomato are plotted. This cell consists of two inclined electrodes, at inverse potentials, and is an adaptation made in the Dielectric Laboratory of the cell used by Varlan-Sansen. To obtain the graphs, the Laplace equation was solved by finite differences and a program in Fortran language was written, which performs the calculations by numerical iteration. The field generated by the cell at different electrode separation distances was analyzed.
绘制了全果番茄电介质测量所用电池产生的电场的等势线。该电池由两个倾斜电极组成,处于反向电位,是在Varlan-Sansen使用的电介质实验室中进行的改编。采用有限差分法对拉普拉斯方程进行求解,并用Fortran语言编写程序,采用数值迭代的方法进行计算。分析了电池在不同电极分离距离下产生的电场。
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引用次数: 0
QUANTITATIVE ANALYSIS OF CARDIAC PLANAR SPECT IMAGES OF 99mTC-MIBI RADIOPHARMACEUTICAL 99mTC-MIBI放射制药公司心脏平面SPECT图像定量分析
IF 0.3 Q4 PHYSICS, MULTIDISCIPLINARY Pub Date : 2021-07-15 DOI: 10.31527/ANALESAFA.2021.32.2.39
Natalí Guisande, M. Pallarès, S. Rozanskas, L. Quiroga, C. Y. Chain, L. H. Illanes
In this work 99mTc-MIBI cardiac scintigraphs are quantitively analyzed with the aim to determine the radiopharmaceutical uptake in the heart (organ of interest) and in the liver. The impact of the radioactivity distribution in the diagnostic quality of the images is discussed.
在这项工作中,99mTc-MIBI心脏闪烁图进行了定量分析,目的是确定放射性药物在心脏(感兴趣的器官)和肝脏的摄取。讨论了放射性分布对图像诊断质量的影响。
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引用次数: 0
SELECTION OF POWER LINE COMMUNICATIONS PROTOCOL APPLIED TO A WIND TURBINE UNDER SEVERE CLIMATE CONDITIONS 恶劣气候条件下风力发电机组电力线通信协议的选择
IF 0.3 Q4 PHYSICS, MULTIDISCIPLINARY Pub Date : 2021-07-15 DOI: 10.31527/analesafa.2021.32.2.55
A. L. Ibarreta Fañanas, M. Lavorato
The main purpose of this paper is to study the preliminary selection of one or more Power Line Communications protocols or standards, to be used in a full duplex communication between a wind turbine and a command center powered by this wind turbine. This situation considers that the wind turbine is located in an isolated area in the Patagonia Austral region, working under severe climate conditions.
本文的主要目的是研究一种或多种电力线通信协议或标准的初步选择,用于风力发电机与由该风力发电机供电的指挥中心之间的全双工通信。这种情况认为风力涡轮机位于巴塔哥尼亚南部地区的一个孤立地区,在恶劣的气候条件下工作。
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引用次数: 1
SELF-REGULATED LEARNING IN ENGINEERING STUDENTS: STRATEGIES FOR PEDAGOGICAL RESOURCE 工科学生自主学习:教学资源策略
IF 0.3 Q4 PHYSICS, MULTIDISCIPLINARY Pub Date : 2021-04-15 DOI: 10.31527/ANALESAFA.2021.32.1.32
V. Miná, M. Silvestre, L. Otero
This paper presents some findings of the investigation "Self-regulated learning in engineering students of the Army Engineering Faculty (FIE)". The central theoretical contributions on the “self-regulation of learning” comes from theconceptual approaches of Zimmerman and Pintrich since they allow the understanding of the processes that takes placein the control of: thoughts, feelings, motivations and actions for the achievement of the learning objectives.It was found that to achieve this self-regulation in their learning, the students in this sample developed strategies throughwhich they manage and internalize resources from the academic environment. They are grouped into two large catego-ries: group study and the use of elements of the environment. The dynamics of conformation and functioning of work incollaborative study teams are similar among students. In addition, they describe the progressive use of elements of theinstitutional environment: study spaces, materials, technologies, institutional devices and also codes and dynamics ofsocial interaction typical of this faculty. The achievement of self-regulation implies the progressive incorporation of theresources of the academic context and this is a process that demands time and effort from the student. The acquisitionof self-regulation is evidence of the solid construction of the student ́s craft and a successful educational affiliation tothe university context.
本文介绍了对“陆军工程学院工科学生自主学习情况”的调查结果。关于“学习的自我调节”的核心理论贡献来自齐默尔曼和平特里奇的概念方法,因为他们允许理解为实现学习目标而控制思想、感情、动机和行动的过程。研究发现,为了在学习中实现这种自我调节,本样本的学生制定了管理和内化学术环境资源的策略。它们被分为两大类:小组研究和环境要素的利用。在学生中,协作学习小组的构象动态和工作功能是相似的。此外,他们还描述了机构环境元素的逐步使用:学习空间、材料、技术、机构设备以及该学院典型的社会互动规范和动态。自我调节的实现意味着学术环境资源的逐步整合,这是一个需要学生时间和努力的过程。自我调节能力的获得证明了学生技能的牢固构建以及与大学环境的成功教育联系。
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引用次数: 4
PHOTOPHYSICAL AND PHOTOCHEMICAL SYSTEMS WITH SEMICONDUCTORS FOR THE CONVERSION OF SOLAR ENERGY. A REVIEW 用于太阳能转换的半导体光物理和光化学系统。回顾
IF 0.3 Q4 PHYSICS, MULTIDISCIPLINARY Pub Date : 2021-04-15 DOI: 10.31527/ANALESAFA.2021.32.1.22
F. A. Filippin, H. Fasoli
Electrochemical energy sources are an alternative to replace technology based on the burning of fossil fuels. In an elec-trochemical system the potential drop spreads over a very narrow region at an interphase, creating high electric fields.So, there are good technological reasons to study semiconductor / electrolyte interphases. Currently, one of the ways touse renewable resources is through photovoltaic technology that directly converts solar radiation into electrical energy.This technology is manufactured from semiconductors, generally silicon, following an extremely careful and expensivemanufacturing procedure. An option for photovoltaic devices is photoelectrochemical cells.These cells are made bythe contact of a semiconductor electrode with a solution, which can be easily prepared and offers the possibility oflow-cost manufacturing. Understanding how these devices work requires knowledge of the characteristics of semicon-ductors and how these materials behave in contact with an electrolytic solution and under illumination by sunlight. Thepresent work describes, through an updated review, the principles and applications of semiconductor electrodes as themain components in a photoelectrochemical solar cell (PEC), to carry out chemical reactions of technological interest.In addition, the elements that are required for the improvement in the performance and construction of the PEC are discussed.
电化学能源是一种替代以燃烧化石燃料为基础的技术。在电化学系统中,电势下降扩散到界面的一个非常狭窄的区域,产生高电场。因此,研究半导体/电解质界面有很好的技术理由。目前,利用可再生资源的方法之一是通过光伏技术,直接将太阳辐射转化为电能。这项技术是由半导体(通常是硅)制成的,经过了极其谨慎和昂贵的制造过程。光伏器件的一种选择是光电化学电池。这些电池是通过半导体电极与溶液接触制成的,这种溶液很容易制备,并提供了低成本制造的可能性。了解这些器件的工作原理需要了解半导体的特性,以及这些材料在与电解溶液接触和阳光照射下的行为。本文通过对半导体电极作为光电化学太阳能电池(PEC)的主要组成部分的原理和应用的最新综述,描述了半导体电极在进行具有技术意义的化学反应方面的应用。此外,本文还讨论了提高PEC性能和结构所需的要素。
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引用次数: 1
A PRELIMINARY STUDY OF THE EFFECT OF ANESTHETIC AGENTS ON THE RHEOLOGICAL PARAMETERS OF GLYCATED ERYTHROCYTES 麻醉药物对糖化红细胞流变学参数影响的初步研究
IF 0.3 Q4 PHYSICS, MULTIDISCIPLINARY Pub Date : 2021-01-15 DOI: 10.31527/ANALESAFA.2020.31.4.117
M. V. B. D. Silva, Facultad Cs. Bioquímicas y Farmacéuticas Rosario Argentina. Área Física, H. Castellini, N. Alet, B. Riquelme, Analía I. Alet, Fceia – Rosario Argentina Departamento de Física, Argentina. Facultad de Cs. Médicas Rosario, Ifir Rosario Argentina. Grupo de Óptica Aplicada a la Biología
This paper presents a preliminary study of the effects of the anesthetics propofol, remifentanil, and vecuronium bromide on the rheological properties of glycated erythrocytes in vitro, modeling the glycation by hyperglycemia observed in diabetes. Viscoelastic and aggregation kinetic parameters of erythrocytes were determined using an erythrocyte rheometer and an optical chip aggregometer developed in our laboratory. The results showed significant alterations in the membrane surface viscosity, the elastic modulus, and the erythrocyte deformability index for the different anesthetics studied. Also, the kinetics aggregation parameters showed different types of alterations due to the effect of anesthetics. This preliminary study suggests that the use of these anesthetics in diabetic patients could induce hemorheological alterations that disturb the microcirculation. For this reason, it is recommended to deepen these investigations to prevent complications in surgical procedures.
本文初步研究了异丙酚、瑞芬太尼和维库溴铵对体外糖基化红细胞流变学特性的影响,模拟了糖尿病患者高血糖引起的糖基化。用本实验室研制的红细胞流变仪和光学芯片聚集仪测定红细胞的粘弹性和聚集动力学参数。结果表明,不同麻醉药对细胞膜表面黏度、弹性模量和红细胞变形指数有显著影响。此外,由于麻醉剂的作用,动力学聚集参数显示出不同类型的改变。这项初步研究表明,在糖尿病患者中使用这些麻醉剂可能会引起血液流变学改变,扰乱微循环。因此,建议深化这些调查,以防止手术过程中的并发症。
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引用次数: 1
SHAPE OF GRAIN BOUNDARY GROOVE ONPURE ICE SURFACE 纯冰表面晶界槽的形状
IF 0.3 Q4 PHYSICS, MULTIDISCIPLINARY Pub Date : 2021-01-15 DOI: 10.31527/ANALESAFA.2020.31.4.112
C. L. D. Prinzio, Córdoba Argentina. Famaf Ciudad Universitaria, D. Stoler, P. I. Achával, G. Varela
In this work we studied the evolution of the groove that forms the grain boundary (BG) when it emerges to a free surface, in the presence of different processes of matter transport. By using a confocal microscope, the shape of the grain edge groove was obtained in an ice sample with orientation< 1010 >/50◦ at −5◦C ; after keeping it 3 h in an environment with dry air. The shapes and depths of the grain boundary groove obtained experimentally, at regular time periods, were satisfactorily fitted considering a process of transport of matter developed by Srinivasan and Trivedi. In this model the transport of matter is mainly ruled by gaseous diffusion and not by surface diffusion.
在这项工作中,我们研究了在不同的物质输运过程中,当晶界(BG)出现在自由表面时形成的凹槽的演变。在共聚焦显微镜下,获得了取向< 1010 >/50◦at - 5◦C的冰样晶粒边缘凹槽的形状;在空气干燥的环境中保存3小时后。考虑到Srinivasan和Trivedi提出的物质输运过程,实验得到的晶界槽的形状和深度在规则的时间周期内得到了令人满意的拟合。在这个模型中,物质的输运主要受气体扩散而不是表面扩散的支配。
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引用次数: 0
EXTENDED FADDEEV-JACKIW CANONICAL QUANTIZATION FOR THE (1+1)-DIMENSIONAL NONRELATIVISTIC ELECTRODYNAMICS (1+1)维非相对论电动力学的扩展faddev - jackiw正则量子化
IF 0.3 Q4 PHYSICS, MULTIDISCIPLINARY Pub Date : 2021-01-15 DOI: 10.31527/ANALESAFA.2020.31.4.127
E. Manavella
Some time ago, we proposed an extension of the usual Faddeev-Jackiw formalism for constrained systems with Grassmann dynamic variables in the field theory context. In the present work, we apply this extended formalism to the (1+1)-dimensional nonrelativistic electrodynamics. By comparing the obtained results with those corresponding to the implementation of Dirac formalism on this model, we find the same constraints and generalized brackets. In this way, we can conclude that the extended Faddeev-Jackiw and the Dirac formalisms can be considered equivalent, at least for this model. On the contrary, in this case, we find that there is no equivalence between the usual Faddeev-Jackiw and the Dirac formalisms. On the other hand, we observe that the extended formalism is more economical than the Dirac one regarding the computation of both, constraints and generalized brackets.
前段时间,我们在场论的背景下,对具有Grassmann动态变量的约束系统提出了常用的faddev - jackiw形式主义的扩展。在目前的工作中,我们将这种扩展的形式主义应用于(1+1)维非相对论性电动力学。将得到的结果与在该模型上实现狄拉克形式的结果进行比较,我们发现了相同的约束条件和广义括号。这样,我们可以得出结论,扩展的faddev - jackiw和Dirac形式可以被认为是等价的,至少对于这个模型是等价的。相反,在这种情况下,我们发现在通常的法迪夫-杰基夫形式主义和狄拉克形式主义之间没有对等关系。另一方面,我们观察到,在约束和广义括号的计算方面,扩展形式主义比狄拉克形式主义更经济。
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引用次数: 0
STUDENT REPRESENTATIONS ON THE USE AND INFLUENCE OF ICT IN THE ENGINEERING STUDY 学生对工程学习中信息通信技术的使用和影响的陈述
IF 0.3 Q4 PHYSICS, MULTIDISCIPLINARY Pub Date : 2021-01-15 DOI: 10.31527/analesafa.2021.31.4.1
V. Miná, F. Romeo, S. Travieso, M. Silvestre, L. Otero
This work presents the initial findings of the research “Self-regulated learning in Engineering students from the Army Engineering College (FIE)”. The sample of this study was made up of students from the 2016 cohort. Zimmerman’s cyclical model of “self-regulation of learning” is the main theoretical reference of this research since it allows the understanding of the processes that take place in the control of: thoughts, feelings, motivations and actions to achieve the learning objectives. It was found that for the achievement of this self-regulation in their learning a resource that they use as academic support is Information and Communication Technologies (ICT). Access to the same YouTube channels and websites is similar among students. The interviewees unanimously mentioned a distinctive human trait of this faculty: the closeness and familiarity in the treatment between teachers and students. This trust is what drives them to interact freely with their teachers and allows them to raise questions and concerns through different communication channels. In summary, human communication and the effective presence of teachers enhance the use of ICTs, since they ultimately provide feedback and benefit students in accessing comprehension strategies that contribute to their academic self-regulation.
这项工作介绍了“陆军工程学院(FIE)工程专业学生的自我调节学习”研究的初步结果。本研究的样本由2016年的学生组成。齐默尔曼的“学习自我调节”循环模型是本研究的主要理论参考,因为它可以理解在控制思想、感情、动机和行动的过程中发生的过程,以实现学习目标。研究发现,为了在学习中实现这种自我调节,他们使用的学术支持资源是信息和通信技术(ICT)。学生访问相同的YouTube频道和网站的方式是相似的。受访者不约而同地提到了该学院的一个独特的人性特征:师生之间的亲密和熟悉。正是这种信任驱使他们与老师自由互动,并允许他们通过不同的沟通渠道提出问题和关注。总之,人际沟通和教师的有效参与促进了信息通信技术的使用,因为它们最终提供反馈,并使学生获得有助于其学术自我监管的理解策略。
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引用次数: 0
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Anales AFA
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