Anales AFA最新文献_第3页

X-RAY MICROTOMOGRAPHY TO CHARACTERIZE THE ROOT CANAL VOLUME EXTRACTED IN ENDODONTIC INSTRUMENTATION x射线显微断层扫描表征根管器械中提取的根管体积

IF 0.3

Anales AFA Pub Date : 2022-10-15 DOI: 10.31527/analesafa.2022.33.3.70

R. Gilli, F. Mattea, G. Martín, M. Valente

{"title":"X-RAY MICROTOMOGRAPHY TO CHARACTERIZE THE ROOT CANAL VOLUME EXTRACTED IN ENDODONTIC INSTRUMENTATION","authors":"R. Gilli, F. Mattea, G. Martín, M. Valente","doi":"10.31527/analesafa.2022.33.3.70","DOIUrl":"https://doi.org/10.31527/analesafa.2022.33.3.70","url":null,"abstract":"During the last decades, the analytical techniques of X-ray absorption contrast imaging have systematically gained greater relevance, mainly due to the ability to attain non-destructive exploration of the sample interior. The significant improvement in spatial resolution offered by X-ray micro-tomography, as compared to conventional computed tomography, has motivated its insertion in many biomedical fields, among which dentistry stands out. Particularly, for endodontics, microCT appears as a method of remarkable potential interest to study procedures involved in root canal treatments, where one of the main needs is the anatomical characterization of the root canal in the teeth. The present work reports on the adaptation of the microCT equipment of the LIIFAMIRx⃝laboratory at the E. Gaviola Physics Institute, CONICET and UNC, thus allowing to acquire of radiographic images of dental samples of interest, to be later used in the implementation of algorithms, intended to tomographic reconstruction and volume segmentation. As a result, radiographic images of premolar teeth were obtained with good contrast between the different materials present, and three-dimensional representations, whose visualization is comparable with the real samples. Moreover, it was possible to characterize the root canal volume of the tooth both in its natural form and after having undergone the instrumentation process in which the pulp tissue is extracted.","PeriodicalId":41478,"journal":{"name":"Anales AFA","volume":"11 1","pages":""},"PeriodicalIF":0.3,"publicationDate":"2022-10-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"87366804","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

OPTOMECHANICAL TRANSDUCTION AND OPTICAL BISTABILITIES IN BRAGG-REFLECTOR-BASED MICRORESONATORS 基于bragg反射器的微谐振器的光机械转导和光双稳定性

IF 0.3

Anales AFA Pub Date : 2022-10-15 DOI: 10.31527/analesafa.2022.33.3.59

S. Anguiano, A. Bruchhausen, A. Fainstein

引用次数: 0

APPLICATION OF THE LIBS TECHNIQUE IN THE DETECTION OF Ti ININDUSTRIAL LIQUID EFFLUENTS 液相色谱技术在工业废液中钛检测中的应用

IF 0.3

Anales AFA Pub Date : 2022-10-15 DOI: 10.31527/analesafa.2022.33.3.65

M.P. Bayala, C. D'Angelo

{"title":"APPLICATION OF THE LIBS TECHNIQUE IN THE DETECTION OF Ti ININDUSTRIAL LIQUID EFFLUENTS","authors":"M.P. Bayala, C. D'Angelo","doi":"10.31527/analesafa.2022.33.3.65","DOIUrl":"https://doi.org/10.31527/analesafa.2022.33.3.65","url":null,"abstract":"In the graphic and textile industries, liquid effluents are generated from the dyes used in the different processes. In these effluents, a heavy metal of great interest, such as Titanium (Ti), is found. This element is not currently contemplated in the environmental legal framework in Argentina, and there are no known diagnostic techniques that are responsible for its measurement. This work studied the feasibility of applying the Laser-Induced Breakdown Spectroscopy (LIBS)technique for detecting Ti in industrial effluents. In the assembly of samples, a possible stabilization method was established for their final disposal, considering the encapsulation in cement for construction. Based on this, four samples were assembled with Portland cement with the addition of ashes, obtained from subjecting the effluents of a graphic industry to a series of physicochemical processes. For a possible quantification process by LIBS, the thin plasma model was proposed, which established the best post-breakdown and integration times for registering the 521.04 nm line ofTi I. As the study’s final results, apost-breakdowntime was 35μs and an integration time of 300 ns. With this, it is intended to optimize the measurement parameters for the analysis and calculation of concentrations, thus promoting the use of the LIBS technique as feasible for this type of measurement.","PeriodicalId":41478,"journal":{"name":"Anales AFA","volume":"20 1","pages":""},"PeriodicalIF":0.3,"publicationDate":"2022-10-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"73443167","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

TOWARDS MORE DURABLE KNEE PROSTHESES: THE PHAN-THIEN AND TANNERMODEL AND THE ELASTO-HYDRODYNAMIC LUBRICATION 迈向更耐用的膝关节假体:phan-thien和tanner模型以及弹性流体动力润滑

IF 0.3

Anales AFA Pub Date : 2022-08-16 DOI: 10.31527/analesafa.2022.fluidos.36

B. Weiss, S. Ubal, J. Di Paolo

{"title":"TOWARDS MORE DURABLE KNEE PROSTHESES: THE PHAN-THIEN AND TANNERMODEL AND THE ELASTO-HYDRODYNAMIC LUBRICATION","authors":"B. Weiss, S. Ubal, J. Di Paolo","doi":"10.31527/analesafa.2022.fluidos.36","DOIUrl":"https://doi.org/10.31527/analesafa.2022.fluidos.36","url":null,"abstract":"The synovial fluid is usually assumed to be Newtonian despite its viscoelastic behavior. In this work a model based on the Reynolds equation and the Phan-Thien and Tanner rheological law (PTT) is presented. The model, of the ellipsoid-on-plane type, contemplates the curvature of the articular surfaces and assumes the tibial component, typically made of ultra-high molecular weight polyethylene (UHMWPE), is deformed according to the column model. Using commercial software COMSOL Multiphysics version 5.2, the governing equations of non-Newtonian lubrication flow were simultaneously solved to find the component of the total stress tensor for the PTT model, in the direction perpendicular to the flow, and the lubricating film thickness. From these results the friction forces and friction coefficients on the articular surfaces were calculated. Simulations were carried out for different operating conditions corresponding to elasto-hydrodynamic lubrication, the predominant lubrication mechanism in the simple support phase of the gait cycle. The results show the importance of an adequate model to obtain quantitative information, considering the fluid as Newtonian would lead to overestimations of the lubricant film thickness. The results suggest that, as long as thin film lubrication is the lubrication regime, the viscosupplementation and consequent increase in relaxation constantλwouldlead to lower coefficients of friction. However, for the lubrication regime to be thin film lubrication, the relaxation constant of the fluid should be less than 2.5×10−5s.","PeriodicalId":41478,"journal":{"name":"Anales AFA","volume":"30 1","pages":""},"PeriodicalIF":0.3,"publicationDate":"2022-08-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"81845702","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

FLOW AND DEPOSITION OF DIFFERENT PROPPANTS CARRIED BY FLUIDS IN ASCALED VERTICAL FRACTURE 垂向结垢裂缝中流体携带不同支撑剂的流动与沉积

IF 0.3

Anales AFA Pub Date : 2022-08-16 DOI: 10.31527/analesafa.2022.fluidos.62

C. Gracia, M. Baldini, M. E. Fernandez

引用次数: 0

NUMERICAL SIMULATION OF THE FILLING OF AN ELASTIC CHAMBER: A FIRST APPROACH TO THE DIASTOLIC FLOW IN THE LEFT VENTRICLE 弹性腔室充盈的数值模拟:左心室舒张期血流的初步研究

IF 0.3

Anales AFA Pub Date : 2022-08-16 DOI: 10.31527/analesafa.2022.fluidos.41

J. P. G. Marí, M.N. Pizarro Ricciotti, C. A. Perazzo

引用次数: 0

DISCHARGES IN CONTACT WITH LIQUIDS: ELECTRICAL CHARACTERIZATION OFA PULSED CORONA DISCHARGE 与液体接触的放电:脉冲电晕放电的电学特性

IF 0.3

Anales AFA Pub Date : 2022-08-16 DOI: 10.31527/analesafa.2021.33.fluidos.6

N. Milardovich, M. Ferreyra, J. Chamorro, L. Prevosto

{"title":"DISCHARGES IN CONTACT WITH LIQUIDS: ELECTRICAL CHARACTERIZATION OFA PULSED CORONA DISCHARGE","authors":"N. Milardovich, M. Ferreyra, J. Chamorro, L. Prevosto","doi":"10.31527/analesafa.2021.33.fluidos.6","DOIUrl":"https://doi.org/10.31527/analesafa.2021.33.fluidos.6","url":null,"abstract":"The large number of works published in recent years on non-thermal discharges in (and in contact with) liquids, shows the growing interest in this particular field of electric discharges due to the large number of technological applications. In particular, one of the fastest growing emerging applications is the treatment of water, both for its purification and for its activation, with a view to carrying out the indirect treatment of food and seeds with non-thermal discharges; without the addition of chemicals. In this work, the experimental characterization of a corona discharge in contact with water operating in a pulsed regime is presented. A flat-wire type geometry was used with the flat electrode immersed in water. The discharge was powered through a pulsed capacitive type source, capable of providing a periodic train ofhigh voltage pulses (∼15 kV) with short duration (∼100 ns), with a repetition frequency of 40 pulses/s. The results of discharge voltage and current measurements are reported and discussed for different operating conditions, and the instantaneous power and energy dissipated in the generated plasma are inferred. Photographs in the visible with long exposure times of the pulsed discharge are also shown","PeriodicalId":41478,"journal":{"name":"Anales AFA","volume":"21 1","pages":""},"PeriodicalIF":0.3,"publicationDate":"2022-08-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"83710997","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

GRAVITY EFFECTS IN THE RETRACTION OF LIQUID FILAMENTS RESTING ON AN INCLINED PLANE 重力对斜面上液体细丝收缩的影响

IF 0.3

Anales AFA Pub Date : 2022-08-16 DOI: 10.31527/analesafa.2022.fluidos.52

P. D. Ravazzoli, A. G. González, J. Diez

{"title":"GRAVITY EFFECTS IN THE RETRACTION OF LIQUID FILAMENTS RESTING ON AN INCLINED PLANE","authors":"P. D. Ravazzoli, A. G. González, J. Diez","doi":"10.31527/analesafa.2022.fluidos.52","DOIUrl":"https://doi.org/10.31527/analesafa.2022.fluidos.52","url":null,"abstract":"We study the retraction of liquid filaments resting on inclined solid substrates under partially wetting condition. This one causes each extreme of the filament to retract and form a region of mass accumulation (head) that subsequently develops a neck at its rear part. This neck then breaks up into a separate drop, while the rest of the filament restarts the sequence. In the horizontal case, this process is symmetric and leads to a regular arrangement of evenly spaced drops. When the substrate is inclined, gravity acts differently at each end, thus modifying the distance retracted by each end, the retraction speed and the final distance between drops, which also ceases to be uniform. We find that in the case of the inclined plane, the maximum distance retracted by the end that recedes against (in favor of) gravity decreases(increases) with respect to the horizontal case. This effect turns out to be a useful mechanism for the self–positioning of the resulting drops at the end of the process. Our experimental results, such as end positions, thickness profiles in the longitudinal section, etc., are contrasted with numerical simulations of the Navier–Stokes equations, obtaining a good agreement. This is achieved by using in the contact line the boundary condition known as Cox–Voinov–Blake (CVB)relationship, which includes both the effects of macroscopic hydrodynamics as well as molecular dynamics.","PeriodicalId":41478,"journal":{"name":"Anales AFA","volume":"3 1","pages":""},"PeriodicalIF":0.3,"publicationDate":"2022-08-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"85592937","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

CFD ANALYSIS ON FLOW CONTROL USING A BALL VALVE 球阀流量控制的CFD分析

IF 0.3

Anales AFA Pub Date : 2022-08-16 DOI: 10.31527/analesafa.2022.fluidos.21

F. Hazzi, C. Cardona, C. Pairetti, C. Venier

{"title":"CFD ANALYSIS ON FLOW CONTROL USING A BALL VALVE","authors":"F. Hazzi, C. Cardona, C. Pairetti, C. Venier","doi":"10.31527/analesafa.2022.fluidos.21","DOIUrl":"https://doi.org/10.31527/analesafa.2022.fluidos.21","url":null,"abstract":"Flow control in piping systems is present in many engineering applications and is carried out by different components. In particular, ball valves consist of a plug with a cylindrical orifice that regulates the flow through rotation, modifying the effective passage section. In the present work, this type of device is studied using Computational Fluid Dynamics(CFD). The simulations are carried out using the SimScale calculation platform, based on the free OpenFOAM software. The main objective of this analysis is to set and validate a numerical tool to predict the relationship between the opening percentage and the pressure loss for normalized valves, analyzing the flow structures developed in the vicinity of the plug. The models used are validated in axisymmetric problems of conduits with constant section and with a localized structure, comparing with the analytical solution and with numerical simulations, respectively. Then the case of a real ball valve in a turbulent regime at different openings is studied, comparing the results with experimental data and with numerical simulations carried out by other authors. A good agreement of the pressure loss coefficient is observed for each of the opening angles studied, verifying its independence on the Reynolds number.","PeriodicalId":41478,"journal":{"name":"Anales AFA","volume":"65 1","pages":""},"PeriodicalIF":0.3,"publicationDate":"2022-08-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"86802289","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

CFD ANALYSIS OF THE HEAD LOSS ON A T45-R TESLA VALVE t45-r型特斯拉阀水头损失CFD分析

IF 0.3

Anales AFA Pub Date : 2022-08-16 DOI: 10.31527/analesafa.2022.fluidos.26

C. Cardona, F. Hazzi, C. Pairetti, C. Venier

{"title":"CFD ANALYSIS OF THE HEAD LOSS ON A T45-R TESLA VALVE","authors":"C. Cardona, F. Hazzi, C. Pairetti, C. Venier","doi":"10.31527/analesafa.2022.fluidos.26","DOIUrl":"https://doi.org/10.31527/analesafa.2022.fluidos.26","url":null,"abstract":"The Tesla valve is a check valve without moving parts. Its operation depends strongly on the flow rate. This conduit develops asymmetric head losses due to its geometric design, behaving like a hydraulic diode with a certain degree of efficiency. In the direct flow direction, the pressure drop is relatively low, while in the reverse direction the hydraulic resistance is higher. In the present work, we develop a numerical model, based on Computational Fluid Dynamics(CFD), to study the normalized Tesla valve T45-R. We simulate the incompressible laminar flow in this device. First, we analyze the precision of the model with a mesh convergence analysis. Subsequently, we compared the numerical prediction of head loss with experimental data for low Reynolds numbers, obtaining good agreement. We observe differences of less than 15 % for the forward direction and less than 6 % for the reverse direction. The diodicity prediction of the CFD differs from the experimental data below 5 %. The results obtained from the loss coefficient K differ from the experimental data by less than 14 %. Afterwards, we compared the CFD results with 0D models, available in the literature, observing a good agreement for a wider Reynolds number range. As a result of this study, we have a numerical design tool for this type of device, particularly applied in the field of microfluidics, having verified its precision in a wide operating range.","PeriodicalId":41478,"journal":{"name":"Anales AFA","volume":"21 1","pages":""},"PeriodicalIF":0.3,"publicationDate":"2022-08-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"89333165","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