Patryk Sokołowski, Karolina Rychert, Jacek Łubiński
Interferometric methods are characterized by high measurement accuracy, and the use of fiber optics allows to be used in hard-to-reach areas. Fiber optic interferometry offers a promising capability to operate in real-time monitoring of metal surface in interacting components. This study uses a fiber optic interferometer as an instrument to estimate the surface conditions and displacement. The proposed solution allows evaluating the distance of the fiber optic end from the material surface to determine the distance and surface condition. Measurements were made in the range of 10-500 μm with a step of 10 μm. Stainless steel samples after sliding friction test were measured. The proposed sensor makes it possible to evaluate the degrees of abrasion of the various surfaces of the interacting components in machines.
{"title":"Fiber optic interferometer as a sensor for surface conditions measurement","authors":"Patryk Sokołowski, Karolina Rychert, Jacek Łubiński","doi":"10.1117/12.3021424","DOIUrl":"https://doi.org/10.1117/12.3021424","url":null,"abstract":"Interferometric methods are characterized by high measurement accuracy, and the use of fiber optics allows to be used in hard-to-reach areas. Fiber optic interferometry offers a promising capability to operate in real-time monitoring of metal surface in interacting components. This study uses a fiber optic interferometer as an instrument to estimate the surface conditions and displacement. The proposed solution allows evaluating the distance of the fiber optic end from the material surface to determine the distance and surface condition. Measurements were made in the range of 10-500 μm with a step of 10 μm. Stainless steel samples after sliding friction test were measured. The proposed sensor makes it possible to evaluate the degrees of abrasion of the various surfaces of the interacting components in machines.","PeriodicalId":198425,"journal":{"name":"Other Conferences","volume":"12 3","pages":"1318707 - 1318707-7"},"PeriodicalIF":0.0,"publicationDate":"2024-06-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141353880","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}
C. Zenkova, D. Ivanskyi, Vladyslav M. Tkachuk, Mykhailo Diachenko
The paper offers a new approach associated with the use of luminescent carbon nanoparticles for the studies of super-smooth surfaces (Rq~4–5 nm). Fluorescent nanoparticles can serve as highly-sensitive probes of the object surface inhomogeneities, realizing a contactless version of the atomic-force profilometry. Using structured light for particles’ fluorescence excitation enables to resolve the fine structural units of the surface relief in the nanometer range. The use of nanoparticles as a probe makes it possible to circumvent the spatial-resolution limitations of optical systems dictated by the classical wave-optics concepts (Rayleigh limit).
{"title":"New approaches of supersmooth surfaces diagnostics by using carbon nanoparticles","authors":"C. Zenkova, D. Ivanskyi, Vladyslav M. Tkachuk, Mykhailo Diachenko","doi":"10.1117/12.3021745","DOIUrl":"https://doi.org/10.1117/12.3021745","url":null,"abstract":"The paper offers a new approach associated with the use of luminescent carbon nanoparticles for the studies of super-smooth surfaces (Rq~4–5 nm). Fluorescent nanoparticles can serve as highly-sensitive probes of the object surface inhomogeneities, realizing a contactless version of the atomic-force profilometry. Using structured light for particles’ fluorescence excitation enables to resolve the fine structural units of the surface relief in the nanometer range. The use of nanoparticles as a probe makes it possible to circumvent the spatial-resolution limitations of optical systems dictated by the classical wave-optics concepts (Rayleigh limit).","PeriodicalId":198425,"journal":{"name":"Other Conferences","volume":"80 6","pages":"1318706 - 1318706-7"},"PeriodicalIF":0.0,"publicationDate":"2024-06-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141350375","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}
Maria Cristina Langa, Diana Florina Nica, C. Sinescu
Dental whitening is a popular method among patients who want to improve the aesthetics of their smile. It is a relatively inexpensive technique and it has a significant impact on the patient’s confidence. Because of the popularity of this procedure, the scope of modern techniques is to minimize both the duration and the eventual adverse effects, such as postoperative sensitivity. A review was performed in order to compare the effectiveness between in-office conventional bleaching treatment and laser activated bleaching. Another aim of the study was to assess the dental sensitivity following these techniques. Three patients were treated using in-office conventional and diode laser-activated bleaching methods. Even though multiple studies have been concluded that the sensitivity levels are not higher using the conventional method in comparison to modern methods, the postoperative sensibility is related to the concentration and the contact time of the bleaching agent. Therefore, we concluded that laser activated bleaching is not significantly more efficient than the conventional method. However, in comparison to the latter method, the former one minimizes the duration of the procedure and decreases the number of sessions, as well as the dose of bleaching agent. Thus, it causes a lower sensitivity to the patient.
{"title":"Differences in effectiveness and tooth sensitivity between modern bleaching techniques: clinical experiences","authors":"Maria Cristina Langa, Diana Florina Nica, C. Sinescu","doi":"10.1117/12.3021919","DOIUrl":"https://doi.org/10.1117/12.3021919","url":null,"abstract":"Dental whitening is a popular method among patients who want to improve the aesthetics of their smile. It is a relatively inexpensive technique and it has a significant impact on the patient’s confidence. Because of the popularity of this procedure, the scope of modern techniques is to minimize both the duration and the eventual adverse effects, such as postoperative sensitivity. A review was performed in order to compare the effectiveness between in-office conventional bleaching treatment and laser activated bleaching. Another aim of the study was to assess the dental sensitivity following these techniques. Three patients were treated using in-office conventional and diode laser-activated bleaching methods. Even though multiple studies have been concluded that the sensitivity levels are not higher using the conventional method in comparison to modern methods, the postoperative sensibility is related to the concentration and the contact time of the bleaching agent. Therefore, we concluded that laser activated bleaching is not significantly more efficient than the conventional method. However, in comparison to the latter method, the former one minimizes the duration of the procedure and decreases the number of sessions, as well as the dose of bleaching agent. Thus, it causes a lower sensitivity to the patient.","PeriodicalId":198425,"journal":{"name":"Other Conferences","volume":"121 31","pages":"131870K - 131870K-4"},"PeriodicalIF":0.0,"publicationDate":"2024-06-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141351877","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}
The present industry faces numerous challenges in terms of delivering complex products, fast, inexpensive, on time, and with a robust quality level. To achieve these requirements, more and more companies are adopting a strategical orientation toward automation lines. The paper is describing the integration in the traceability systems of flexible systems formed of 3D visions working in synergy with robots to achieve higher levels of autonomy in industrial automation, level 4, High Level Automation, and level 5 Full Automation. This integration is representing a new wave in product inspection and automation level, bringing full transparency under the control of Total Traceability Management (TTM) and assuring new performance levels in terms of quality, flexibility and costs. The increasing complexity of the logistical supply and distribution flow is a consequence of the increased complexity of a vehicle's equipment and components. Increased complexity of the logistics and supply process in values proves that 50 years ago 90% of the vehicle was produced in factories for an OEM (Original Equipment Manufacturer) and today 90% of the vehicle is produced by other suppliers. It is no longer enough to control your own processes and guarantee quality within the OEM factories. The entire logistics chain must deliver a high level of quality, because in the end the materials and assemblies that reach the OEM line must be compliant so that they can be assembled without problems and guarantee the level of quality and safety required for the vehicle. All this must be done under the conditions of flexible production with many customers at the same time, where each vehicle on the OEM assembly lines may differ from the previous or subsequent one in terms of consistent quality and exact delivery times, all in accordance with JIT/JIS principles and in accordance with the specifications in the supply contract with the respective customer.
{"title":"Deployment of 3D vision systems integrated with robots in traceability systems to achieve dynamic positioning in fully automated lines","authors":"H. Mizgan, M. Ganea, Florin Blaga","doi":"10.1117/12.3021866","DOIUrl":"https://doi.org/10.1117/12.3021866","url":null,"abstract":"The present industry faces numerous challenges in terms of delivering complex products, fast, inexpensive, on time, and with a robust quality level. To achieve these requirements, more and more companies are adopting a strategical orientation toward automation lines. The paper is describing the integration in the traceability systems of flexible systems formed of 3D visions working in synergy with robots to achieve higher levels of autonomy in industrial automation, level 4, High Level Automation, and level 5 Full Automation. This integration is representing a new wave in product inspection and automation level, bringing full transparency under the control of Total Traceability Management (TTM) and assuring new performance levels in terms of quality, flexibility and costs. The increasing complexity of the logistical supply and distribution flow is a consequence of the increased complexity of a vehicle's equipment and components. Increased complexity of the logistics and supply process in values proves that 50 years ago 90% of the vehicle was produced in factories for an OEM (Original Equipment Manufacturer) and today 90% of the vehicle is produced by other suppliers. It is no longer enough to control your own processes and guarantee quality within the OEM factories. The entire logistics chain must deliver a high level of quality, because in the end the materials and assemblies that reach the OEM line must be compliant so that they can be assembled without problems and guarantee the level of quality and safety required for the vehicle. All this must be done under the conditions of flexible production with many customers at the same time, where each vehicle on the OEM assembly lines may differ from the previous or subsequent one in terms of consistent quality and exact delivery times, all in accordance with JIT/JIS principles and in accordance with the specifications in the supply contract with the respective customer.","PeriodicalId":198425,"journal":{"name":"Other Conferences","volume":"123 9","pages":"131870E - 131870E-9"},"PeriodicalIF":0.0,"publicationDate":"2024-06-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141351843","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}
Most animals see little or no color at all. The same fact applies to the Magnetic Resonance technique: the signals are located mostly in shadowy zones interrupted by few light zones. Therefore, the MRAs (Magnetic Resonance Angiograms) are hard to interpret by the physician. MRA offers an image of how the blood spreads through the vessels and organs of the body. Both physician and patient can see where the pathway followed by the blood is blocked. As prevention is better than curing, we focus on finding an algorithm to improve the image contrast and outline the regions of interest. We aim thus to allow an early detection of the illness. For our study, we applied a combined method on biomedical images, to improve their optical contrast: an edge detection algorithm and a strong Matlab contrast-enhancement method named Contrast Limited Adaptive Histogram Equalization. Thus, we should allow the detection of the vascular system or the edges of the organs and improve the chances of an accurate diagnosis. The resulted contrast improvements are visible, unmasking medical features (hidden through the low contrast of the image).
{"title":"Optical edge detection of chest MRA using combined contrast enhancement algorithms","authors":"B. Arvinti","doi":"10.1117/12.3021603","DOIUrl":"https://doi.org/10.1117/12.3021603","url":null,"abstract":"Most animals see little or no color at all. The same fact applies to the Magnetic Resonance technique: the signals are located mostly in shadowy zones interrupted by few light zones. Therefore, the MRAs (Magnetic Resonance Angiograms) are hard to interpret by the physician. MRA offers an image of how the blood spreads through the vessels and organs of the body. Both physician and patient can see where the pathway followed by the blood is blocked. As prevention is better than curing, we focus on finding an algorithm to improve the image contrast and outline the regions of interest. We aim thus to allow an early detection of the illness. For our study, we applied a combined method on biomedical images, to improve their optical contrast: an edge detection algorithm and a strong Matlab contrast-enhancement method named Contrast Limited Adaptive Histogram Equalization. Thus, we should allow the detection of the vascular system or the edges of the organs and improve the chances of an accurate diagnosis. The resulted contrast improvements are visible, unmasking medical features (hidden through the low contrast of the image).","PeriodicalId":198425,"journal":{"name":"Other Conferences","volume":"47 6","pages":"131870I - 131870I-7"},"PeriodicalIF":0.0,"publicationDate":"2024-06-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141353284","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}
The authors propose the development of a three-degree-of-freedom hand vibration compensation device, featuring a compliant mechanical structure incorporating three stack-type piezoelectric actuators. Inspired by the Stewart-type mobile platform, the system employs this design to manipulate a laser beam in two directions. Moreover, it facilitates an optimal axial stroke, ensuring precise laser beam focusing. This paper details the comprehensive process, encompassing modeling, simulation, and experimental trials, of a compliant mechanical amplifier designed for powering an innovative laser scalpel prototype. The active tremor damping capability of the proposed system is thoroughly examined, shedding light on its potential applications in medical settings. The authors employed a mechatronic approach, integrating mathematical models, MATLAB simulations and finite element analysis (FEA). Mathematical models were utilized to capture the static deformation of the compliant mechanical structure, providing a theoretical foundation for the subsequent stages of development. MATLAB simulations were then conducted to validate and refine the theoretical models, ensuring their accuracy in representing the system's behavior under various conditions. To further enhance the robustness of the design, finite element analysis (FEA) was employed to validate the structural integrity and performance of the proposed device. This simulation tool allowed for a detailed examination of stress distribution, deformation patterns, and overall mechanical response, guiding refinements to optimize the system's functionality. Expanding upon this, the research underscores the significance of mitigating hand tremors in surgical procedures, emphasizing the practical implications of the developed device.
{"title":"Integrated approach to precision instrumentation: design, modeling, and experimental validation of a compliant mechanical amplifier for laser scalpel prototype","authors":"E. Niță, D. Comeagă, Mihai Avram","doi":"10.1117/12.3021501","DOIUrl":"https://doi.org/10.1117/12.3021501","url":null,"abstract":"The authors propose the development of a three-degree-of-freedom hand vibration compensation device, featuring a compliant mechanical structure incorporating three stack-type piezoelectric actuators. Inspired by the Stewart-type mobile platform, the system employs this design to manipulate a laser beam in two directions. Moreover, it facilitates an optimal axial stroke, ensuring precise laser beam focusing. This paper details the comprehensive process, encompassing modeling, simulation, and experimental trials, of a compliant mechanical amplifier designed for powering an innovative laser scalpel prototype. The active tremor damping capability of the proposed system is thoroughly examined, shedding light on its potential applications in medical settings. The authors employed a mechatronic approach, integrating mathematical models, MATLAB simulations and finite element analysis (FEA). Mathematical models were utilized to capture the static deformation of the compliant mechanical structure, providing a theoretical foundation for the subsequent stages of development. MATLAB simulations were then conducted to validate and refine the theoretical models, ensuring their accuracy in representing the system's behavior under various conditions. To further enhance the robustness of the design, finite element analysis (FEA) was employed to validate the structural integrity and performance of the proposed device. This simulation tool allowed for a detailed examination of stress distribution, deformation patterns, and overall mechanical response, guiding refinements to optimize the system's functionality. Expanding upon this, the research underscores the significance of mitigating hand tremors in surgical procedures, emphasizing the practical implications of the developed device.","PeriodicalId":198425,"journal":{"name":"Other Conferences","volume":"9 4","pages":"131870C - 131870C-12"},"PeriodicalIF":0.0,"publicationDate":"2024-06-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141350850","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}
Andrei-Florentin Vasiliu, Eduard-Sebastian Csukas, Paul-Iulian Virga, Daniel Comeaga
The paper in question implicitly focusses on validating component eigen frequencies, modal shapes, and damping characteristics within a display base plate component by using experimental modal analysis (EMA) and finite element analysis (FEA). Following this, a 3D component modal simulation results obtained prior physical measurements was performed using Ansys software, extracting eigen frequencies and modal shapes. This fundamental engineering method together with a laser vibrometer monitoring system was used to investigate structures and systems dynamic behavior, understanding vibration phenomena, extracting linear elastic mechanical proprieties through direct measurements, aiding in evaluating base line design structural integrity with the purpose of optimizing the further design. Subsequently, the resonance frequencies obtained from both EMA and FEA were input into Ansys software to perform a comparative study using the Cross Modal Assurance Criterion (CrossMac) method, revealing the level of agreement between them. The comparative analysis revealed a significant correlation between the experimentally eigen frequencies obtained based on laser vibrometer monitoring and obtained by FEA, confirming the precision and utility of the CrossMac method in anticipating the modal characteristics of the tested component. The validation carried out through this method strengthens confidence in the combined approach of EMA with laser vibrometer monitoring and FEA, highlighting the importance of this combination, for a dynamical structural deeper behavior understanding and to strive towards its continual improvement to perfection.
这篇论文隐含的重点是通过使用实验模态分析（EMA）和有限元分析（FEA）验证显示器底板组件内的组件特征频率、模态形状和阻尼特性。随后，使用 Ansys 软件对物理测量之前获得的三维组件模态模拟结果进行分析，提取特征频率和模态振型。这种基本工程方法与激光测振仪监测系统一起用于研究结构和系统的动态行为，了解振动现象，通过直接测量提取线性弹性机械特性，帮助评估基准线设计结构的完整性，从而优化进一步的设计。随后，将从 EMA 和 FEA 中获得的共振频率输入 Ansys 软件，使用交叉模态保证准则（CrossMac）方法进行比较研究，揭示两者之间的一致程度。比较分析表明，根据激光测振仪监测获得的实验特征频率与有限元分析获得的特征频率之间存在明显的相关性，这证实了 CrossMac 方法在预测受测部件模态特性方面的精确性和实用性。通过这种方法进行的验证增强了人们对 EMA 与激光测振仪监测和有限元分析相结合的方法的信心，突出了这种组合的重要性，有助于加深对动态结构行为的理解，并努力使其不断完善。
{"title":"Base plate resonance frequencies determination via a laser vibrometer: EMA, FEA, and CrossMac validation","authors":"Andrei-Florentin Vasiliu, Eduard-Sebastian Csukas, Paul-Iulian Virga, Daniel Comeaga","doi":"10.1117/12.3021348","DOIUrl":"https://doi.org/10.1117/12.3021348","url":null,"abstract":"The paper in question implicitly focusses on validating component eigen frequencies, modal shapes, and damping characteristics within a display base plate component by using experimental modal analysis (EMA) and finite element analysis (FEA). Following this, a 3D component modal simulation results obtained prior physical measurements was performed using Ansys software, extracting eigen frequencies and modal shapes. This fundamental engineering method together with a laser vibrometer monitoring system was used to investigate structures and systems dynamic behavior, understanding vibration phenomena, extracting linear elastic mechanical proprieties through direct measurements, aiding in evaluating base line design structural integrity with the purpose of optimizing the further design. Subsequently, the resonance frequencies obtained from both EMA and FEA were input into Ansys software to perform a comparative study using the Cross Modal Assurance Criterion (CrossMac) method, revealing the level of agreement between them. The comparative analysis revealed a significant correlation between the experimentally eigen frequencies obtained based on laser vibrometer monitoring and obtained by FEA, confirming the precision and utility of the CrossMac method in anticipating the modal characteristics of the tested component. The validation carried out through this method strengthens confidence in the combined approach of EMA with laser vibrometer monitoring and FEA, highlighting the importance of this combination, for a dynamical structural deeper behavior understanding and to strive towards its continual improvement to perfection.","PeriodicalId":198425,"journal":{"name":"Other Conferences","volume":"23 23","pages":"131870F - 131870F-10"},"PeriodicalIF":0.0,"publicationDate":"2024-06-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141354655","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}
Possibilities of geometric phase using in low-coherence polarization-sensitive tomography tasks for noninvasive diagnostics of surface (subsurface) layers of transparent biological media (samples and tissues) are considered. Determination of the object fields’ geometric phase in the modified Mach-Zehnder interferometer allows one to reproduce the geometric structure (optical axis/collagen orientation) of birefringent biological medium. Polarization-interference noninvasive approach of diagnostics the collagen orientation structure of thin nanosized surface tissue layers is proposed at the first time. It is shown, that taking into account the information about top (surface) layer structure can significantly improve the accuracy of deeper (subsurface) layers parameters estimation. The proposed solution is a unique feature that is not accessible in classical polarization-sensitive techniques of information recovery on tissue structure.
{"title":"Geometric phase in PS-OCT for deep accurate analysis of transparent biological anisotropic tissues","authors":"O. Angelsky, D. Ivanskyi","doi":"10.1117/12.3021746","DOIUrl":"https://doi.org/10.1117/12.3021746","url":null,"abstract":"Possibilities of geometric phase using in low-coherence polarization-sensitive tomography tasks for noninvasive diagnostics of surface (subsurface) layers of transparent biological media (samples and tissues) are considered. Determination of the object fields’ geometric phase in the modified Mach-Zehnder interferometer allows one to reproduce the geometric structure (optical axis/collagen orientation) of birefringent biological medium. Polarization-interference noninvasive approach of diagnostics the collagen orientation structure of thin nanosized surface tissue layers is proposed at the first time. It is shown, that taking into account the information about top (surface) layer structure can significantly improve the accuracy of deeper (subsurface) layers parameters estimation. The proposed solution is a unique feature that is not accessible in classical polarization-sensitive techniques of information recovery on tissue structure.","PeriodicalId":198425,"journal":{"name":"Other Conferences","volume":"34 11","pages":"1318704 - 1318704-7"},"PeriodicalIF":0.0,"publicationDate":"2024-06-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141353853","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}
Florin Jipa, Paula Florian, M. Icriverzi, Gianina Popescu-Pelin, P. Garoi, Raluca Ivan, D. Budei, Emanuel Axente, Koji Sugioka, F. Sima
Although Titanium and its alloys are generally used for the manufacturing of dental implant abutments, they are typically prone to bacterial infection, due to their implantation in the transgingival region. In close contact with the soft surrounding tissue, the surface may be functionalized in order to improve connective tissue cells adhesion while preventing bacterial penetration at the interface. Ultrafast laser processing of dental implants has demonstrated the potential to obtain unique surface features, down to the nanoscale. With this study, we introduce the possibility to generate laser-induced periodic surface structures (LIPSS) by picosecond laser processing, with periodicity of about 500 nm on large-scale surfaces, in a contamination-free approach. By changing the applied laser dose, different surface coloring of TiAl6V4 samples is obtained due to a gradual surface oxidation, as revealed by depth-profile compositional analyses. In the same time, an increase of the irradiation dose induced the formation of thicker oxide layers, the oxygen content increasing up to ten times. The response of human mesenchymal stem cells (hMSCs) in contact with laser processed surfaces was evaluated to assess samples cytocompatibility. It was demonstrated that large-scale, uniform LIPSS distributed on whole TiAl6V4 surface are beneficial to hMSCs viability and proliferation.
{"title":"Laser-induced periodic surface structures on TiAl6V4 surfaces by picosecond laser processing for dental abutments","authors":"Florin Jipa, Paula Florian, M. Icriverzi, Gianina Popescu-Pelin, P. Garoi, Raluca Ivan, D. Budei, Emanuel Axente, Koji Sugioka, F. Sima","doi":"10.1117/12.3014582","DOIUrl":"https://doi.org/10.1117/12.3014582","url":null,"abstract":"Although Titanium and its alloys are generally used for the manufacturing of dental implant abutments, they are typically prone to bacterial infection, due to their implantation in the transgingival region. In close contact with the soft surrounding tissue, the surface may be functionalized in order to improve connective tissue cells adhesion while preventing bacterial penetration at the interface. Ultrafast laser processing of dental implants has demonstrated the potential to obtain unique surface features, down to the nanoscale. With this study, we introduce the possibility to generate laser-induced periodic surface structures (LIPSS) by picosecond laser processing, with periodicity of about 500 nm on large-scale surfaces, in a contamination-free approach. By changing the applied laser dose, different surface coloring of TiAl6V4 samples is obtained due to a gradual surface oxidation, as revealed by depth-profile compositional analyses. In the same time, an increase of the irradiation dose induced the formation of thicker oxide layers, the oxygen content increasing up to ten times. The response of human mesenchymal stem cells (hMSCs) in contact with laser processed surfaces was evaluated to assess samples cytocompatibility. It was demonstrated that large-scale, uniform LIPSS distributed on whole TiAl6V4 surface are beneficial to hMSCs viability and proliferation.","PeriodicalId":198425,"journal":{"name":"Other Conferences","volume":"143 20","pages":"1318708 - 1318708-9"},"PeriodicalIF":0.0,"publicationDate":"2024-06-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141350862","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}
With the rapid advancement of modern processor technologies, the potential threat to processor memory security from external devices necessitates robust memory protection mechanisms. To ensure the stability and security of processors, Input-Output (IO) physical memory protection mechanisms are commonly employed to prevent unauthorized access to processor memory. However, the redundancy in the mapping relationships between modules in traditional IO physical memory protection mechanisms leads to an increase in processor runtime. This paper, focusing on RISC-V processors, presents an efficient memory protection scheme, named L-OPT, by investigating traditional IO physical memory protection approaches. L-OPT optimizes the mapping relationships between internal modules in conventional memory protection schemes. In comparison with the unoptimized state of the processor in memory testing scenarios, L-OPT demonstrates a 112% efficiency improvement, validating its effectiveness in enhancing processor runtime efficiency.
{"title":"Design of lightweight memory protection solution based on RISC-V processor","authors":"Kai Nie, Rongcai Zhao, Xiao Zhang, Shuyu Li","doi":"10.1117/12.3032024","DOIUrl":"https://doi.org/10.1117/12.3032024","url":null,"abstract":"With the rapid advancement of modern processor technologies, the potential threat to processor memory security from external devices necessitates robust memory protection mechanisms. To ensure the stability and security of processors, Input-Output (IO) physical memory protection mechanisms are commonly employed to prevent unauthorized access to processor memory. However, the redundancy in the mapping relationships between modules in traditional IO physical memory protection mechanisms leads to an increase in processor runtime. This paper, focusing on RISC-V processors, presents an efficient memory protection scheme, named L-OPT, by investigating traditional IO physical memory protection approaches. L-OPT optimizes the mapping relationships between internal modules in conventional memory protection schemes. In comparison with the unoptimized state of the processor in memory testing scenarios, L-OPT demonstrates a 112% efficiency improvement, validating its effectiveness in enhancing processor runtime efficiency.","PeriodicalId":198425,"journal":{"name":"Other Conferences","volume":"97 4","pages":"131751Q - 131751Q-10"},"PeriodicalIF":0.0,"publicationDate":"2024-06-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141378079","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}
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