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Littérature scientifique sur le sujet « Software micro-structures »

Auteur : Grafiati

Publié le 9 mars 2023

Mis à jour le 10 mars 2023

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Articles de revues sur le sujet "Software micro-structures"

Huang, Guo Qiang, Jian Qun Liu et Wei Qiang Gao. « Development of CNC System Software for Micro V-Groove Machine Tool ». Key Engineering Materials 679 (février 2016) : 37–41. http://dx.doi.org/10.4028/www.scientific.net/kem.679.37.

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The computerize numerical control (CNC) system is one of the key factors for the development of micro v-groove machine tools to fabrication micro v-groove structures. Based on the investigation on the machining of micro v-groove structures, a developed software contains five modules: editing, automatic programming, program control, manual control and human machine interface. A3200 software based motion controller integrated with the machine characteristics is used in this study to develop the motion control functions of the micro v-groove machine tool. Meanwhile, a method is proposed to redefine the instructions of M, T and S by setting monitoring points so as to enhance the scalability of CNC system. The results show that the CNC system software is not only stable and reliable, but also satisfies the basic requirements of the ultra-precision machining of micro v-groove structures.

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Zhang, Yong, Zhen Long Wang, Z. Y. Li et Wan Sheng Zhao. « Research on Electrode Wear Prediction and Compensation On-Line Technology for Micro EDM Application ». Key Engineering Materials 392-394 (octobre 2008) : 166–71. http://dx.doi.org/10.4028/www.scientific.net/kem.392-394.166.

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A micro-EDM equipment which can fabricate three-dimensional micro-structures is developed. A method of electrode wear compensation on-line which is very important to micro 3D structures machined by micro-EDM is presented. In this method, the wear of electrode can be predicted by the statistics law of open rate of discharge status, therefore, its precise model which is very difficult to build as well as the special CAD/CAM system is hardly necessary. At the same time, the micro-EDM CAD/CAM technology which applies the universal CAD/CAM software for milling is also researched and experienced on Unigraphics (UG). At last, micro 3D structures, a micro hemisphere with diameter ∅150+m and a micro 3D beam which is very popular in MEMS, are machined on silicon wafer by this way, which proves the wide useful of this method and the promising application in MEMS.

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Gheorghe, Ion Gheorghe, Liliana Laura Badita, Adriana Cirstoiu, Simona Istriteanu, Veronica Despa et Stergios Ganatsios. « "Mechatronics Galaxy" a New Concept for Developing Education in Engineering ». Applied Mechanics and Materials 371 (août 2013) : 754–58. http://dx.doi.org/10.4028/www.scientific.net/amm.371.754.

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This paper initiates the launch and the integration of a new scientific concept: "Mechatronics Galaxy", a support of industrial research for European sustainable and strategic development. This new concept is based on achievement and development of evolutionary and integrative-synergistic concepts regarding micro-nanomechatronics engineering, micro-nanoelectronics engineering and micro-nanoIT engineering for: spatial, temporal and functional integration;intelligent adaptive behaviour based on perception, self-learning, self-diagnostics and systemic reconfiguration; adequate flexibility of software and hardware structures; predictive development of micro-nano-mechatronics structures and of the intelligent computerized applicability with high added value; simultaneous mix-integrative design of micro-nano-products, micro-nano-systems and micro-nano-technologies; a strategy of technological impact in economy, industry, society and education. Thus, the new concept "Mechatronics Galaxy" creates and develops micro-nano-mechatronics engineering, based on fundamental and applied techniques: micro-nano-mechatronics, micro-nano-robotics, micro-nano-integronics, micro-nano-sensoristics, micro-nano-actuators, micro-nano-processing and intelligent micro-nano-manufacturing.

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Li, Cui Yu, et Rui Wang. « The Application of Finite Element Analysis Software MSC.Marc in Numerical Simulation of Fabric ». Advanced Materials Research 332-334 (septembre 2011) : 2116–19. http://dx.doi.org/10.4028/www.scientific.net/amr.332-334.2116.

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The draping and buckling of woven fabric are simulated with the finite element method based on the micro-mechanical constitutive model and orthotropic constitutive model under gravity load. Compared with the traditional orthotropic mechanical model of the fabric, the micro-mechanical constitutive model characterizes the special properties of woven fabric due to its micro-weaving structures. The woven fabric sheet is discretized with 8-nodes shell elements which are designed for finite deformation and suffice to describe the large rotation of fabric sheet during draping, for the sake of simplicity, the nodes of the fabric sheet on the edges of the desk are assumed to be fixed. Compared with the experimental ones, the simulation results with the micro-mechanical constitutive model are in good agreement with the observations. The work paves the way for developing a virtual clothes trial system.

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Dong, Ying Huai, Zhen Long Wang, Zi Long Peng, Hui Chen et Wan Sheng Zhao. « Design and Fabrication of the Micro Turbine for Micro Gas Turbine Engine ». Advanced Materials Research 69-70 (mai 2009) : 530–34. http://dx.doi.org/10.4028/www.scientific.net/amr.69-70.530.

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The designing of a micro turbine for micro gas turbine engine is presented in this paper. Micro power system is becoming more and more important for micro- and nano-scale system. The fast development of MEMS (Micro Electromechanical Systems) has strongly enhanced the application of new harder work materials. The fabrication of metallic 3D microstructures has been one of the most attractive topics of micro machining. Currently the basic materials of Micro-turbine Engineering were nonmetal materials such as SiC, most of them are 2D or quasi-3D structures. As a low cost, flexible, good repeatable machining process with negligible process forces, micro-EDM milling is well suited for freeform metallic micro structures. A three-dimensional micro turbine was fabricated by micro-EDM milling. A major problem in micro-EDM milling of complex 3D structure by using micro-electrode is the electrode wear. For reducing the impact of electrode wear, A new CAM system based on the UG software platform is developed in order to get good accuracy 2and higher efficiency. A simple tool path generation by CAD/CAM software and a general electrode wear compensation strategy is presented. The wear compensation can be apart from the design of CAD/CAM systems, so existing common CAD/CAM systems can be used to generate milling tool path with an unequal thickness lamination. And then post process for wear compensation and EDM milling can be done to modify tool path by adding wear compensation. The micro turbine blades of which the material is nickel alloy (GH4169) were successfully fabricated by using this strategy. The diameters of turbine are 2.8mm, and the height of each blade is 0.4mm.

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Lee, Chang-Chun, Nien-Ti Tsou et Taek-Soo Kim. « Preface : Nano/Micro Structures in Application of Computational Mechanics ». Computer Modeling in Engineering & ; Sciences 120, n^o 2 (2019) : 235–37. http://dx.doi.org/10.32604/cmes.2019.07807.

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Arcelli Fontana, F., S. Maggioni et C. Raibulet. « Understanding the relevance of micro-structures for design patterns detection ». Journal of Systems and Software 84, n^o 12 (décembre 2011) : 2334–47. http://dx.doi.org/10.1016/j.jss.2011.07.006.

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Chkalov, Ruslan. « Telecommunication Network for Controlling the Processes of Micro-Sized Structures Topology Formation ». MATEC Web of Conferences 346 (2021) : 01020. http://dx.doi.org/10.1051/matecconf/202134601020.

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The article is devoted to the task of organization of complex interaction between separate modules of technological installations for material processing. The basic principles of control software development of industrial laser systems for precision processing, the possibility of implementing remote control of the complex executing hardware are considered. The system application examples for solving problems of high-precision processing of transparent solid materials are shown.

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Zaideman, Oded, et Anath Fischer. « Geometric Bone Modeling : From Macro to Micro Structures ». Journal of Computer Science and Technology 25, n^o 3 (mai 2010) : 614–22. http://dx.doi.org/10.1007/s11390-010-9350-0.

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Zhao, Zhong Li, Bao Jun Zhou, Jian Zhuang, Da Ming Wu, Ya Jun Zhang, Xiu Ting Zheng et Kai Fang Dang. « Design and Simulation Analysis of a New Type of Micro Metal-Plastic Heat Radiator ». Key Engineering Materials 562-565 (juillet 2013) : 1127–31. http://dx.doi.org/10.4028/www.scientific.net/kem.562-565.1127.

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With the development of micro-nanomachining technology (MNMT), micro heat radiator is getting attention. In this paper, the heat dissipation mechanism of light emitting diode (LED) ball lamp is introduced. And the LED heat radiator is simplified. On the basis of that, a new type of micro metal-plastic heat radiator of LED is put forward. And the LED heat radiator is simplified. A series of numerical simulations are carried out to compare the heat dissipation performance of micro heat radiator respectively made by metal, plastic, metal-plastic composite by the FloEFD software. Micro metal-plastic heat radiator structures, including fin spacing, fin thickness, fin height and substrate thickness, are carry out to be simulated.

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Thèses sur le sujet "Software micro-structures"

MAGGIONI, STEFANO. « Design pattern detection and software architecture reconstruction : an integrated approach based on software micro-structures ». Doctoral thesis, Università degli Studi di Milano-Bicocca, 2010. http://hdl.handle.net/10281/7817.

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Livres sur le sujet "Software micro-structures"

Kormanyos, Christopher Michael. Real-time C++ : Efficient object-oriented and template micro-controller programming. Heidelberg : Springer, 2013.

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Trepulė, Elena, Airina Volungevičienė, Margarita Teresevičienė, Estela Daukšienė, Rasa Greenspon, Giedrė Tamoliūnė, Marius Šadauskas et Gintarė Vaitonytė. Guidelines for open and online learning assessment and recognition with reference to the National and European qualification framework : micro-credentials as a proposal for tuning and transparency. Vytauto Didžiojo universitetas, 2021. http://dx.doi.org/10.7220/9786094674792.

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These Guidelines are one of the results of the four-year research project “Open Online Learning for Digital and Networked Society” (2017-2021). The project objective was to enable university teachers to design open and online learning through open and online learning curriculum and environment applying learning analytics as a metacognitive tool and creating open and online learning assessment and recognition practices, responding to the needs of digital and networked society. The research of the project resulted in 10 scientific publications and 2 studies prepared by Vytautas Magnus university Institute of Innovative Studies research team in collaboration with their international research partners from Germany, Spain and Portugal. The final stage of the research attempted creating open and online learning assessment and recognition practices, responding to the learner needs in contemporary digital and networked society. The need for open learning recognition has been increasing during the recent decade while the developments of open learning related to the Covid 19 pandemics have dramatically increased the need for systematic and high-quality assessment and recognition of learning acquired online. The given time also relates to the increased need to offer micro-credentials to learners, as well as a rising need for universities to prepare for micro-credentialization and issue new digital credentials to learners who are regular students, as well as adult learners joining for single courses. The increased need of all labour - market participants for frequent and fast renewal of competences requires a well working and easy to use system of open learning assessment and recognition. For learners, it is critical that the micro-credentials are well linked to national and European qualification frameworks, as well as European digital credential infrastructures (e.g., Europass and similar). For employers, it is important to receive requested quality information that is encrypted in the metadata of the credential. While for universities, there is the need to properly prepare institutional digital infrastructure, organizational procedures, descriptions of open learning opportunities and virtual learning environments to share, import and export the meta-data easily and seamlessly through European Digital Hub service infrastructures, as well as ensure that academic and administrative staff has digital competencies to design, issue and recognise open learning through digital and micro-credentials. The first chapter of the Guidelines provides a background view of the European Qualification Framework and National Qualification frameworks for the further system of gaining, stacking and modelling further qualifications through open online learning. The second chapter suggests the review of current European policy papers and consultations on the establishment of micro-credentials in European higher education. The findings of the report of micro-credentials higher education consultation group “European Approach to Micro-credentials” is shortly introduced, as well as important policy discussions taking place. Responding to the Rome Bologna Comunique 2020, where the ministers responsible for higher education agreed to support lifelong learning through issuing micro-credentials, a joint endeavour of DG Employment, Social Affairs and Inclusion and DG Research and Innovation resulted in one of the most important political documents highlighting the potential of micro-credentials towards economic, social and education innovations. The consultation group of experts from the Member States defined the approach to micro-credentials to facilitate their validation, recognition and portability, as well as to foster a larger uptake to support individual learning in any subject area and at any stage of life or career. The Consultation Group also suggested further urgent topics to be discussed, including the storage, data exchange, portability, and data standards of micro-credentials and proposed EU Standard of constitutive elements of micro-credentials. The third chapter is devoted to the institutional readiness to issue and to recognize digital and micro-credentials. Universities need strategic decisions and procedures ready to be enacted for assessment of open learning and issuing micro-credentials. The administrative and academic staff needs to be aware and confident to follow these procedures while keeping the quality assurance procedures in place, as well. The process needs to include increasing teacher awareness in the processes of open learning assessment and the role of micro-credentials for the competitiveness of lifelong learners in general. When the strategic documents and procedures to assess open learning are in place and the staff is ready and well aware of the processes, the description of the courses and the virtual learning environment needs to be prepared to provide the necessary metadata for the assessment of open learning and issuing of micro-credentials. Different innovation-driven projects offer solutions: OEPass developed a pilot Learning Passport, based on European Diploma Supplement, MicroHE developed a portal Credentify for displaying, verifying and sharing micro-credential data. Credentify platform is using Blockchain technology and is developed to comply with European Qualifications Framework. Institutions, willing to join Credentify platform, should make strategic discussions to apply micro-credential metadata standards. The ECCOE project building on outcomes of OEPass and MicroHE offers an all-encompassing set of quality descriptors for credentials and the descriptions of learning opportunities in higher education. The third chapter also describes the requirements for university structures to interact with the Europass digital credentials infrastructure. In 2020, European Commission launched a new Europass platform with Digital Credential Infrastructure in place. Higher education institutions issuing micro-credentials linked to Europass digital credentials infrastructure may offer added value for the learners and can increase reliability and fraud-resistant information for the employers. However, before using Europass Digital Credentials, universities should fulfil the necessary preconditions that include obtaining a qualified electronic seal, installing additional software and preparing the necessary data templates. Moreover, the virtual learning environment needs to be prepared to export learning outcomes to a digital credential, maintaining and securing learner authentication. Open learning opportunity descriptions also need to be adjusted to transfer and match information for the credential meta-data. The Fourth chapter illustrates how digital badges as a type of micro-credentials in open online learning assessment may be used in higher education to create added value for the learners and employers. An adequately provided metadata allows using digital badges as a valuable tool for recognition in all learning settings, including formal, non-formal and informal.

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Chapitres de livres sur le sujet "Software micro-structures"

Davidson, Ian. « The Design of Non-Linear Structures Using a Small Micro-Computer ». Dans Engineering Software IV, 473–84. Berlin, Heidelberg : Springer Berlin Heidelberg, 1985. http://dx.doi.org/10.1007/978-3-662-21877-8_36.

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Warkentin, Merrill, Vijayan Sugumaran et Ravi Bapna. « Intelligent Agents for E-Commerce ». Dans Internet Commerce and Software Agents, 101–20. IGI Global, 2001. http://dx.doi.org/10.4018/978-1-930708-01-3.ch007.

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A characteristic feature of the explosive growth in electronic commerce is the rapid innovation and adoption of new technologies, which results in the creation of new business relationships between consumers, firms, and markets. One such technology that is profoundly changing the dynamics of the electronic marketplace is ‘intelligent agent’ technology. Agents have the ability to autonomously carry out various activities on behalf of their principals. At a micro-economic level, agents can help buyers and sellers achieve greater efficiencies of information exchange in the electronic business-to-consumer and business-to-business domains. Additionally, they facilitate the creation of vertically integrated portals that have a significant impact on the macroeconomic landscape. Using many real-world examples, we characterize the different roles that software agents play in the various e-commerce business models and also touch upon their impact on creation of new market structures. We address price-matching versus price-comparison agents. We highlight the various purchase decision criteria evident in various vertical markets and suggest the need for a cross-industry product (and service) attribute data representation model, based on the expanded capabilities of XML. We contrast the autonomous price comparisons enabled by agents with the expanded criteria comparisons facilitated by the e-commerce rating sites. We discuss the public policy implications of these second-generation e-commerce agents with regard to data representation standardization and consumer information privacy. We present future directions for intelligent agent functions that encompass standard representation of decision criteria such as delivery and payment options, return policies, service, quality, trust, and reputation.

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Huang, Hung-Chun, Frederick Leslie Davy, Hsin-Yu Shih et Chwei-Jen Fan. « Accelerating Knowledge Adoption ». Dans Advances in Business Information Systems and Analytics, 253–66. IGI Global, 2014. http://dx.doi.org/10.4018/978-1-4666-4983-5.ch015.

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Learning faster is important in personal competitive advantage. However, to accelerate a group of people’s learning efficiency is more complicated than individual practice. Learning efficiency is highlighting research in information systems change management as well as knowledge management. In practice, knowledge is difficult to manage directly. On the other hand, managing knowledge behaviors can achieve knowledge management. A teamwork structure is a micro-social system and internal collaboration network. Therefore, different teamwork structures conduct different knowledge behaviors. Social influence theories provide an interpretation that different social proximity distinguish contagion effects. This study applies the social network perspective to explore the knowledge behaviors of computer software developers. Therefore, the finding of this study shows that controlling network redundancy can enhance knowledge diffusion efficiency. Furthermore, if team fails to manage knowledge diffusion, they will offset the timing of competitive advantage in technological upgrade. Based on this finding, this study suggests a new thinking for implementation of information systems, change management, and strategic planning.

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Huang, Hung-Chun, Frederick Leslie Davy, Hsin-Yu Shih et Chwei-Jen Fan. « Accelerating Knowledge Adoption ». Dans Technology Adoption and Social Issues, 1689–704. IGI Global, 2018. http://dx.doi.org/10.4018/978-1-5225-5201-7.ch079.

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Learning faster is important in personal competitive advantage. However, to accelerate a group of people's learning efficiency is more complicated than individual practice. Learning efficiency is highlighting research in information systems change management as well as knowledge management. In practice, knowledge is difficult to manage directly. On the other hand, managing knowledge behaviors can achieve knowledge management. A teamwork structure is a micro-social system and internal collaboration network. Therefore, different teamwork structures conduct different knowledge behaviors. Social influence theories provide an interpretation that different social proximity distinguish contagion effects. This study applies the social network perspective to explore the knowledge behaviors of computer software developers. Therefore, the finding of this study shows that controlling network redundancy can enhance knowledge diffusion efficiency. Furthermore, if team fails to manage knowledge diffusion, they will offset the timing of competitive advantage in technological upgrade. Based on this finding, this study suggests a new thinking for implementation of information systems, change management, and strategic planning.

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Actes de conférences sur le sujet "Software micro-structures"

Wang, Yukui, Wang Qi, Zhi Cai, Zhaoqi Zeng et Zhenlong Wang. « 4-axis micro ED-milling of micro 3D structures on cylindrical workpiece based on CAD/CAM commercial software ». Dans Mechanical Engineering and Information Technology (EMEIT). IEEE, 2011. http://dx.doi.org/10.1109/emeit.2011.6023355.

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Gomez, Juan A., Glenn Conner, In-Hyouk Song, Yoo-Jae Kim, Byoung Hee You et Du-Hwan Chun. « Finite Element Analysis for Reliable Replication of Alignment Structures in Micro Hot Embossing ». Dans ASME 2013 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2013. http://dx.doi.org/10.1115/imece2013-64829.

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Numerical analysis to predict the flow behavior of polymers was conducted using commercial finite element software, DEFORM-2D. An alignment structure, a hemisphere-tipped post with an annular ring, was modeled to demonstrate the flow front of the polymer during molding. The cavity filling process was evaluated by measuring the heights of the molded posts and confirmed and validated by experimental data. Estimated and measured heights showed better replication accuracy with the increase of molding temperature and embossing force. Results exposed complete cavity filling at embossing forces of 600 and 900 N at a molding temperature of 137.5°C. The FEM prediction tool can be used to select the adequate process parameters for a high fidelity replication of polymer microstructures.

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Wang, Zhenlong, et Yinghuai Dong. « Micro-EDM Milling of Micro Compressor Prototype ». Dans 2007 First International Conference on Integration and Commercialization of Micro and Nanosystems. ASMEDC, 2007. http://dx.doi.org/10.1115/mnc2007-21124.

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Micro power system is becoming more and more important for micro- and nano-scale system. The fast development of MEMS (Micro Electromechanical Systems) has strongly enhanced the application of new harder work materials. The fabrication of metallic 3D microstructures has been one of the most attractive topics of micro machining. Currently the basic materials of Micro-turbine Engineering were nonmetal materials such as SiC, most of them are 2D or quasi-3D structures. This paper focuses on the manufacturing process on micro compressor prototype by micro-EDM milling. The micro compressor prototype contains the rotor disk and stator disk. A simple tool path generation by CAD/CAM software and a general electrode wear compensation strategy is presented. The micro compressor prototype with rotor and stator disks was successfully fabricated by using this strategy, and the materials of workpieces are nickel alloy GH4169 and titanium alloy TC4.

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Puttonen, Tuomas. « Evaluation of Metal Lattice Structures With X-Ray Micro-Computed Tomography : Dimensional Accuracy and Manufacturability ». Dans ASME 2020 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2020. http://dx.doi.org/10.1115/imece2020-23869.

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Abstract Additive manufacturing enables product designers to incorporate complexity onto their designs on multiple size scales. Computer-aided design methods, such as topology optimization and lattice design, have emerged as software tools for applications where part consolidation and weight reduction are desired. Still, a more delicate control of hierarchical complexity and submillimeter-sized features would unlock a widely unexplored frontier of new design possibilities. However, the complexity of a design can respectively affect the manufacturing process. In powder bed fusion, the diameter, power and speed of the laser spot and the resulting size of the melt pool define the attainable feature resolution and accuracy in comparison with the original design intent. X-ray computed tomography can be a useful tool in validation and provide a detailed, volumetric representation of a part with internal features. This paper examines the design accuracy of 316L metal lattice structures and density of solid cubes with industrial X-ray micro-computed tomography. Accessible tools with open source software are presented for CT data analysis. The nominal values are compared against the as-built and CT scanned samples for surface area, volume, and dimensional accuracy. A CT voxel size of 30–40 μm allows to identify printability issues and general trends in the part density in comparison to the geometry changes. However, a finer voxel size in the submicron range would be required to properly detect and localize internal porosity and evaluate surface topography.

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Santos, Mariana, Rodrigo Amador, Paulo Henrique De Souza Bermejo et Heitor Costa. « Similar Characteristics of Internal Software Quality Attributes for Object-Oriented Open-Source Software Projects ». Dans XIII Simpósio Brasileiro de Qualidade de Software. Sociedade Brasileira de Computação - SBC, 2014. http://dx.doi.org/10.5753/sbqs.2014.15254.

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Organizations are becoming increasingly concerned about software quality. In object-oriented (OO) systems, quality is characterized by measurements of internal quality attributes. An efficient and proper method to analyze software quality in the absence of fault-prone or defective data labels is cluster analysis. The aim of this paper is to find similarities among project structures by measuring characteristics of internal software quality. In a sample of 150 open-source software systems, we evaluated software using macro and micro categories. Results obtained using cluster analysis indicated that some domains such as Graphics, Games, and Development tend to have similarities in specialization, abstraction, stability, and complexity. These results exploit the ability of OO software metrics to find similar behavior across domains. The results provide an immediate view of the trends and characteristics of internal software quality of Java systems that need to be addressed so that software systems can continue to be maintainable.

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Tong, Hao, Jing Cui, Yong Li et Yang Wang. « CAD/CAM Integration System of 3D Micro EDM ». Dans 2007 First International Conference on Integration and Commercialization of Micro and Nanosystems. ASMEDC, 2007. http://dx.doi.org/10.1115/mnc2007-21271.

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In 3D scanning micro electro discharge machining (EDM), the CAD/CAM systems being used in mechanical milling of numerical control (NC) are unable to be applied directly due to the particularity of tool electrode wear. Based on industry computer and RT-Linux software platform, a CAD/CAM integration system of 3D micro EDM is developed. In the developed CAD/CAM integration system, the hardware includes mainly a micro feed mechanism for servo control, XY worktable, a high frequency pulse power supply, monitoring circuits etc., and the functions consist of model design, scanning path planning and simulation, NC code generation and post processing, real-time compensating of tool electrode wear, and machining control of states and process. The method of double buffer storage is adopted to transmit numbers of NC machining data. Servo scanning EDM method is used to realize real-time electrode wear compensating and thereby 3D micro structures are machined automatically. The machining experiments are made about model design, parameters optimizing, and process control. The typical 3D micro structures with space curved surfaces and lines have been machined such as micro prism, micro half tube, camber correlation line, and so on. The machining process and results show that the CAD/CAM integration system has the characters of higher real-time, reliability, and general using.

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Sharapov, Andrey, Evgeniy Shamin, Ilya Skuratov et Evgeniy Gornev. « SOFTWARE COMPLEX FOR PHOTOLITHOGRAPHY OPTIMIZATION FOR MINIMIZATION OF SIDEWALL ROUGHNESS EFFECTS IN NANOSTRUCTURES. GROUNDS AND PROBLEM STATEMENT ». Dans International Forum “Microelectronics – 2020”. Joung Scientists Scholarship “Microelectronics – 2020”. XIII International conference «Silicon – 2020». XII young scientists scholarship for silicon nanostructures and devices physics, material science, process and analysis. LLC MAKS Press, 2020. http://dx.doi.org/10.29003/m1654.silicon-2020/375-377.

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Sidewall roughness is an effect occurred during micro- and nanoelectronics’ structure formation using photolithography. In this work we describe the basic model of roughness emergence on nanostructures’ sidewalls, and determine the approach of photolithography parameters optimization in order to minimize the roughness. the standard route of test structures formation is considered. We develop a software complex based on this approach.

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Jia, Wenxuan, Yuen-Shan Leung, Huachao Mao, Han Xu, Chi Zhou et Yong Chen. « Hybrid-Light-Source Stereolithography for Fabricating Macro-Objects With Micro-Textures ». Dans ASME 2021 16th International Manufacturing Science and Engineering Conference. American Society of Mechanical Engineers, 2021. http://dx.doi.org/10.1115/msec2021-63717.

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Abstract Microscale surface structures are commonly found on macroscale bodies of natural creatures for their unique functions. However, it is difficult to fabricate such multi-scale geometry with conventional stereolithography processes that rely on either laser or digital micromirror device (DMD). More specifically, the DMD-based mask projection method displays the image of a cross-section of the part on the resin to fabricate the entire layer efficiently; however, its display resolution is limited by the building area. In comparison, the laser-based vector scanning method builds smooth features using a focused laser beam with desired beam-width resolution; however, it has less throughput for its sequential nature. In this paper, we studied the hybrid-light-source stereolithography process that integrates both optical light sources to facilitate the fabrication of macro-objects with microscale surface structures (called micro-textures in the paper). The hardware system uses a novel calibration approach that ensures pixel-level dimensional accuracy across the two light sources. The software system enables designing the distribution and density of specific microscale textures on a macro-object by generating projection images and laser toolpaths for the two integrated light sources. Several test cases were fabricated to demonstrate the capability of the developed process. A large fabrication area (76.8 mm × 80.0 mm) with 50 μm micro-features can be achieved with a high throughput.

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John, T. J., B. Mathew et H. Hegab. « Multi Layer Micro Pin-Fins Heat Sinks for Better Performance ». Dans ASME 2010 8th International Conference on Nanochannels, Microchannels, and Minichannels collocated with 3rd Joint US-European Fluids Engineering Summer Meeting. ASMEDC, 2010. http://dx.doi.org/10.1115/fedsm-icnmm2010-31167.

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This study numerically investigates the feasibility and advantages of using a multilayer pin-fin heat sink to increase the overall performance of the heat sink. For the purpose of determining overall performance of the pin-fin heat sink a figure of merit (FOM) term is introduced in this paper, which constituted of both the thermal resistance and the pumping power of the heat sink. Higher the FOM of a heat sink better is its overall performance. A computational fluid dynamics software CoventorWARE™ is used for the analysis of micro heat sink performance. A small portion of the entire heat sink is modeled in this study assuming repeatability towards both sides for the ease of analysis. The developed models consist of two sections, the substrate (silicon) and the fluid (water at 278K). A uniform heat flux is applied to the base of the heat sink. A single layer micro pin-fin heat sinks with same dimensions as of the multi layer heat sink was also modeled for the comparison purpose. Temperature distribution at five different locations from the inlet to the outlet section is also analyzed to study the temperature distribution over the heat sink. Circular pin-fins were used in both the multilayer and single layer micro heat sinks. Feasibility of using micro channels as the second layer was also investigated in this paper and it proved to have advantages over using pin-fin structures on both layers. A geometric optimization based on the substrate thickness of the second layer of the double layer heat sink showed that the substrate thickness of the second layer doesn’t have any effect on the overall thermal resistance of the heat sink.

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Liu, Chi-Rong, et Hsin-Yi Shih. « Model Analysis of Syngas Combustion and Emission for a Micro Gas Turbine ». Dans ASME Turbo Expo 2014 : Turbine Technical Conference and Exposition. American Society of Mechanical Engineers, 2014. http://dx.doi.org/10.1115/gt2014-25589.

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The purpose of this study is to investigate the combustion and emission characteristics of syngas fuels applied in a micro gas turbine, which is originally designed for a natural gas fired engine. The computation results were conducted by the commercial CFD software STAR-CD, where the three-dimension compressible k-ε model for turbulent flow and PPDF (Presumed Probability Density Function) model for combustion process were constructed. As the syngas are substituted for methane, the total heat input from the blended fuels and the fuel flow rates are varied with syngas compositions and syngas substitution percentages. The computed results presented the syngas substitution effects on the combustion and emission characteristics at different syngas percentages (up to 80%) for two typical syngas compositions and the conditions where syngas applied at fixed heat input were examined. Results showed the flame structures varied with different syngas substitution percentages. The high temperature regions were dense and concentrated on the core of the primary zone for H2-rich syngas, and then shifted to the sides of the combustor when syngas percentages were high. The NOx emissions decreased with increasing syngas percentages, but NOx emissions are higher at higher hydrogen content for the same syngas percentage. The CO2 emissions also decreased at 10% syngas substitution, but then increased as syngas percentage increased. Only using H2-rich syngas could produce less carbon dioxide. The detailed flame structures, temperature distributions, and gas emissions of the combustor were presented and compared. The exit temperature distributions and pattern factor were also discussed. Before syngas fuels are utilized as an alternative fuel for the micro gas turbine, further experimental testing are needed as the CFD modeling results provide a guidance for the improved designs of the combustor.

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