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1
Thomas, John M. « Advanced Catalysts : Interfaces in the physical and biological sciences ». Advanced Materials 1, no 8-9 (1989) : 251–60. http://dx.doi.org/10.1002/adma.19890010803.
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Thomas, John M. « Advanced Catalysts : Interfaces in the Physical and Biological Sciences ». Angewandte Chemie 101, no 8 (13 janvier 2006) : 1105–14. http://dx.doi.org/10.1002/ange.19891010849.
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Thomas, John M. « Advanced Catalysts : Interfaces in the Physical and Biological Sciences ». Angewandte Chemie International Edition in English 28, no 8 (août 1989) : 1079–88. http://dx.doi.org/10.1002/anie.198910791.
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Sarikaya, Mehmet. « Organic-inorganic interfaces in biological composites ». Proceedings, annual meeting, Electron Microscopy Society of America 52 (1994) : 426–27. http://dx.doi.org/10.1017/s0424820100169869.
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Biological hard tissues, such as bone, dentin, and mollusk shells, are composite materials incorporating an organic matrix and inorganic crystallites in a complex nano- and micro-architectural forms. The interest of physical sciences in biological composites stems from the fact that these materials are self assembled in an hierarchical fashion from molecular to macro scale, and that the resulting assemblies have properties that far exceed those of current synthetic materials of similar elemental or phase compositions. The objective of biomimetics is to either mimick structures of biological composites, biomimicking, or use the synthesis methodologies of organisms to produce new materials, bioduplication. In a biocomposite, substructure and crystallography of the inorganic component are highly ordered, its morphology and shape are species specific; these are all thought to be regulated by the organic matrix. The understanding of ructural relationship between the organic and ceramic components of a biological composite, therefore, is fundamental both to the understanding of mechanisms of biomineralization and to biomimetic design and synthesis of novel engineering materials. These issues will be addressed in the present paper.
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van den Hoven, Elise, et Ali Mazalek. « Grasping gestures : Gesturing with physical artifacts ». Artificial Intelligence for Engineering Design, Analysis and Manufacturing 25, no 3 (11 juillet 2011) : 255–71. http://dx.doi.org/10.1017/s0890060411000072.
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AbstractGestures play an important role in communication. They support the listener, who is trying to understand the speaker. However, they also support the speaker by facilitating the conceptualization and verbalization of messages and reducing cognitive load. Gestures thus play an important role in collaboration and also in problem-solving tasks. In human–computer interaction, gestures are also used to facilitate communication with digital applications, because their expressive nature can enable less constraining and more intuitive digital interactions than conventional user interfaces. Although gesture research in the social sciences typically considers empty-handed gestures, digital gesture interactions often make use of hand-held objects or touch surfaces to capture gestures that would be difficult to track in free space. In most cases, the physical objects used to make these gestures serve primarily as a means of sensing or input. In contrast, tangible interaction makes use of physical objects as embodiments of digital information. The physical objects in a tangible interface thus serve as representations as well as controls for the digital information they are associated with. Building on this concept, gesture interaction has the potential to make use of the physical properties of hand-held objects to enhance or change the functionality of the gestures made. In this paper, we look at the design opportunities that arise at the intersection of gesture and tangible interaction. We believe that gesturing while holding physical artifacts opens up a new interaction design space for collaborative digital applications that is largely unexplored. We provide a survey of gesture interaction work as it relates to tangible and touch interaction. Based on this survey, we define the design space of tangible gesture interaction as the use of physical devices for facilitating, supporting, enhancing, or tracking gestures people make for digital interaction purposes, and outline the design opportunities in this space.
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Morey, Julien, Jean-Bernard Ledeuil, Lénaïc Madec et Hervé Martinez. « Methodological developments to expose and analyse buried interfaces in lithium solid-state batteries using ex situ, in situ and operando cycling ». EPJ Web of Conferences 273 (2022) : 01007. http://dx.doi.org/10.1051/epjconf/202227301007.
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Lithium solid-state batteries (SSBs) are a promising technology for electrochemical energy storage systems. So far, the performance of SSBs are mainly governed by the electro-chemo-mechanical properties of the diverse solid/solid interfaces and their evolution upon cycling. However, as these interfaces are buried in the battery stack, their comprehensive understanding remains a challenge. Here, we thus provide some advances in methodological developments for ex situ, in situ and operando cycling/analysis of these buried interfaces. It is showed that noble gaz ion milling at liquid nitrogen temperature is a suitable and reproducible method to prepare cross-section without any chemical/physical change even for polymer-based SSBs. In addition, innovative operando cycling using Auger analysis was proposed for the first time on a model Li/Li6PS5Cl stack. The interest of this approach is to be able to proceed without a dedicated electrochemical cell and to use the fully adjustable electron beam of the auger to create a surface potential difference followed by lithium migration then SEI (Solid Electrolyte Interface) formation and Li plating. Overall, this work should greatly benefits to all researchers working on buried interfaces study in lithium solid-state batteries.
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Xiao, Jian Zhuang, Qiong Liu, Jiang Tao Du et Chuan Zeng Zhang. « Micro-Damage Mechanisms and Property Fluctuation of Recycled Aggregate Concrete ». Key Engineering Materials 348-349 (septembre 2007) : 61–64. http://dx.doi.org/10.4028/www.scientific.net/kem.348-349.61.
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In this paper, the basic damage mechanisms and the primary reasons for the property fluctuation of recycled aggregate concrete are investigated experimentally. By a comprehensive literature study and systematic laboratory tests, the interactions between the old and the new interfaces in recycled aggregate concrete are analyzed. In particular, the damage initiation and evolution mechanisms on the old and the new interfaces are studied in details. The essential factors affecting the fluctuation and its extent are investigated from the point of view of material sciences. The present results imply that the qualitative and quantitative changes of the old and the new interfaces during the loading process induce a notable fluctuation of the mechanical and the physical properties of recycled aggregate concrete. To reduce the fluctuation and improve the mechanical properties of the recycled aggregate concrete, effective controlling and processing measures are suggested and discussed.
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Kitaev, Yu E., A. S. Krylov et T. I. Maksimova. « Soft mode mechanism of the transition into the low-temperature ferroelastic phase in K-=SUB=-3-=/SUB=-Na(CrO-=SUB=-4-=/SUB=-)-=SUB=-2-=/SUB=- crystals ». Физика твердого тела 58, no 12 (2016) : 2423. http://dx.doi.org/10.21883/ftt.2016.12.43867.187.
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The sequence of phase transitions P3m1 -> C2/m -> C2/c in K3Na(CrO4)2 crystals and existence of the intermediate phase have been studied both experimentally by the Raman scattering method and theoretically by programs and retrieval tools of the Bilbao Crystallographic Server. A zone-edge soft mode responsible for a transition from the intermediate C2/m to a low-symmetry C2/c phase at T=210 K has been discovered experimentally for the first time. The symmetry of the soft mode has been established theoretically to be A2+. The temperature interval of the intermediate monoclinic phase has been determined to be 239-210 K. This work was supported by a grant from the Department of Physical Sciences of the Russian Academy of Sciences within the framework of the program "Basic Optical Spectroscopy and Its Applications."
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Broehan, Jasmin, Nils Kuelper et Frank Thielecke. « Seamless Transitions from Logical to Physical Avionics Architecture Models for Preliminary Aircraft Systems Design ». INCOSE International Symposium 33, no 1 (juillet 2023) : 1315–32. http://dx.doi.org/10.1002/iis2.13084.
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AbstractThe transition of federated aviation electronics (avionics) systems to Integrated Modular Avionics (IMA) concepts leads to a higher integration of functions, which reduces the amount of equipment and therefore system mass. However, these benefits are accompanied by a strong increase in system complexity and more interdependencies. Moreover, further digitalization and automation of aircraft functions lead to a higher impact of avionics in terms of equipment number and energy consumption. One challenge arises from the fact that the IMA platform design starts in parallel to the design of other aircraft on‐board systems, for which the platform shall provide resources like computing power. This leads to a high uncertainty during early design phases on the one hand and to a complex design process including many data and tool interfaces on the other hand. In order to meet these challenges, seamless model‐based design approaches are being broadly investigated. For this purpose, standardized and automated interfaces between different design steps, tools, and stakeholders are needed. In this work, a formalized avionics architecture design process is proposed to support a seamless model‐based tool chain from systems architecting to detailed system design. Methods to handle uncertainties, to provide standardized model interfaces, and to automate transitions between model abstraction levels are included. Overall, this reduces manual effort and the introduction of errors that would lead to high costs during system implementation.
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Laouina, Zineb, Lynda Ouchaouka, Mohamed Moussetad, Soumia Mordane et Mohamed Radid. « Remote Lab Experiments in Mechanic : The Compound Pendulum ». International Journal of Online and Biomedical Engineering (iJOE) 19, no 02 (16 février 2023) : 23–41. http://dx.doi.org/10.3991/ijoe.v19i02.37061.
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In the teaching of experimental sciences, practical work plays a crucial role since it allows learners to transfer the knowledge acquired in theoretical courses into practical skills. For this purpose, laboratories allow learning by experience and aim at involving students, which reinforces learning receptivity. Recent years have seen an increasing use of online labs, including both virtual and remote labs, Remote labs, providing online interfaces to physical labs, allow students to conduct experiments with real-world equipment anywhere and at any time. This paper proposes a model of design, development and implementation of a remote manipulation in an E-Lab. It is the compound pendulum which is part of the handling offered to the students of the 1st year of university in the field of physical sciences. The aim of this paper is to make this approach available to allow more experiments on a digital platform in order to allow learning for all, independently of time and place.
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Han, Violet Yinuo, Hyunsung Cho, Kiyosu Maeda, Alexandra Ion et David Lindlbauer. « BlendMR : A Computational Method to Create Ambient Mixed Reality Interfaces ». Proceedings of the ACM on Human-Computer Interaction 7, ISS (31 octobre 2023) : 217–41. http://dx.doi.org/10.1145/3626472.
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Mixed Reality (MR) systems display content freely in space, and present nearly arbitrary amounts of information, enabling ubiquitous access to digital information. This approach, however, introduces clutter and distraction if too much virtual content is shown. We present BlendMR, an optimization-based MR system that blends virtual content onto the physical objects in users’ environments to serve as ambient information displays. Our approach takes existing 2D applications and meshes of physical objects as input. It analyses the geometry of the physical objects and identifies regions that are suitable hosts for virtual elements. Using a novel integer programming formulation, our approach then optimally maps selected contents of the 2D applications onto the object, optimizing for factors such as importance and hierarchy of information, viewing angle, and geometric distortion. We evaluate BlendMR by comparing it to a 2D window baseline. Study results show that BlendMR decreases clutter and distraction, and is preferred by users. We demonstrate the applicability of BlendMR in a series of results and usage scenarios.
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Bartlett, P. N. « Electrified interfaces in physics, chemistry and biology, NATO ASI Series C : Mathematical and physical sciences vol. 355, R. Guidelli (Ed.) ». Journal of Electroanalytical Chemistry 347, no 1-2 (avril 1993) : 475. http://dx.doi.org/10.1016/0022-0728(93)80114-w.
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Vasilevich, Dmitriy G. « Legal aspects of using information technology to compensate for physical disabilities ». Izvestiya of Saratov University. Economics. Management. Law 23, no 3 (22 août 2023) : 327–32. http://dx.doi.org/10.18500/1994-2540-2023-23-3-327-332.
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Introduction. In the modern period there is a dynamic introduction of information technology in all spheres of social life. Scientific and applied achievements concerning the development of IT began to be actively used for the rehabilitation of people who became disabled, including those with problems with the musculoskeletal system, muscle atrophy, loss of hearing, vision, etc. Theoretical analysis. Advances in scientific and technological progress, especially in medicine, biomedicine, genetics, bioengineering, mathematics, programming, psychophysiology and neurophysiology, alongside the use of information and communication technologies, are changing the quality of life of people who find themselves in extreme health situations. The “industry of smart devices” is developing, assisting people in restoring the functions of lost organs. The use of “smart” devices raises the problem of ensuring free will and mental privacy, respect for privacy, which is one of the manifestations of individual freedom. In this regard, there is a need for the development of scientific directions that study the legal support for the implementation of neuro-interfaces and other “smart devices”. Results. Emphasis is placed on advances in biomedicine, psychophysiology and neurophysiology and other sciences, which, in interaction with the possibilities of information and communication technologies, contribute to the return of people with disabilities to active and fulfilling life activities. While using “smart” devices, there is a problem of ensuring free will and mental privacy, respect for privacy, which is one of the manifestations of individual freedom. It is emphasized that in the future there will be a need to resolve the dilemma between the benefits that “smart devices” can provide for people and the equality of people. The use of these devices in the absence of objective requirements may lead to inequality between people, creating advantages not conditioned by the natural qualities for some of them. The author puts forward an idea of the need to address the issue of qualification of the actions of those who hacked the neuro-interfaces, which caused death or additional harm to the person who uses it.
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Stevenson, C., et C. Prior. « Microscopic Analysis in Archaeology ». MRS Bulletin 14, no 3 (mars 1989) : 21–23. http://dx.doi.org/10.1557/s0883769400063132.
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The papers in this edition of the MRS BULLETIN were among those presented during a workshop entitled “SAS Interfaces '87: Microscopy for the Archaeologist.” The workshop was sponsored by the Society for Archaeological Sciences at the 52nd annual meeting of the Society for American Archaeology held in Toronto, Ontario, May 1987. The Society for Archaeological Sciences is an interdisciplinary professional society for researchers involved in the broad spectrum of physical science applications to archaeology in order to promote interaction among scientists interested in different aspects of common research problems.Archaeometry, i.e., “archaeological science,” is concerned with the physical analysis of archaeological materials and the application of techniques from the laboratory sciences to the objectives and needs of archaeology. It includes such activities as compositional analysis, reconstruction of past technologies and processes, remote sensing, paleo-environmental reconstruction, and of course, isotopic and other chronometric dating methods. Such techniques alone, however, yield results that mean little without appropriate application to anthropological problems. The chief concern of archaeologists is to choose the most appropriate analysis method to achieve results that are useful in interpreting cultural behavior. To that end, laboratory analysts need to be aware of the interests and concerns of archaeologists, and archaeologists need to be able to understand the technical advances in archaeometry to incorporate them into their research.
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Barker, W. W., et J. F. Banfield. « Zones of Chemical and Physical Interaction at Interfaces Between Microbial Communities and Minerals : A Model ». Geomicrobiology Journal 15, no 3 (juillet 1998) : 223–44. http://dx.doi.org/10.1080/01490459809378078.
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Everitt, Aluna, Anne Roudaut, Kasper Hornbæk, Mike Fraser et Jason Alexander. « Investigating pointing performance for tangible surfaces with physical 3D targets ». Proceedings of the ACM on Human-Computer Interaction 6, ISS (14 novembre 2022) : 617–39. http://dx.doi.org/10.1145/3567736.
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One of the most fundamental interactions –pointing– is well understood on flat surfaces. However, pointing performance on tangible surfaces with physical targets is still limited for Tangible User Interfaces (TUIs). We investigate the effect of a target’s physical width, height, and distance on user pointing performance. We conducted a study using a reciprocal tapping task ( n =19) with physical rods arranged in a circle. We compared our data with five conventional interaction models designed for 2D/3D tasks rather than tangible targets. We show that variance in the movement times was only satisfactorily explained by a model established for volumetric displays ( r 2 =0.954). Analysis shows that movement direction and height should be included as parameters to this model to generalize for 3D tangible targets. Qualitative feedback from participants suggests that pointing at physical targets involves additional human factors (e.g., perception of sharpness or robustness) that need to be investigated further to understand how performance with tangible objects is affected.
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Fermeglia, Maurizio, Marek Maly, Paola Posocco et Sabrina Pricl. « Multiscale Molecular Modeling of Hybrid Organic-Inorganic Nanocomposites of Type I and II ». Advances in Science and Technology 54 (septembre 2008) : 265–69. http://dx.doi.org/10.4028/www.scientific.net/ast.54.265.
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A current challenge of physical, chemical and engineering sciences is to develop theoretical tools for predicting structure and physical properties of hybrid organic inorganic nanocomposite from the knowledge of a few input parameters. However, despite all efforts, progress in the prediction of macroscopic physical properties from structure has been slow. Major difficulties relate to the fact that (a) the microstructural elements in multiphase material are not shaped or oriented as in the idealizations of computer simulations, and more than one type can coexist; (b) multiple length and time scales are generally involved and must be taken into account, when overall thermodynamic and mechanical properties wish to be determined, and finally (c) the effect of the interphases/interfaces on the physical properties is often not well understood and characterized. As a consequence, their role is often neglected in the development of new theoretical tools or they are treated in a very empirical way. In this work, we focused on issues (b) and (c) in a multiscale molecular simulation framework, with the ultimate goal of developing a computationally-based nanocomposite designing tool. In particular, we developed a hierarchical procedure in which lower scale (i.e., QM, MD and /or MC) simulations are performed to obtain parameters for higher scale (i.e., mesoscopic and/or finite element) calculations, from which the bulk properties of the hybrid nanocomposite material can be ultimately estimated.
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Battistella, Cinzia, Alberto De Toni et Elena Pessot. « Framing Open Innovation in Start-Ups’ Incubators : A Complexity Theory Perspective ». Journal of Open Innovation : Technology, Market, and Complexity 4, no 3 (7 août 2018) : 33. http://dx.doi.org/10.3390/joitmc4030033.
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Recently, concepts and principles from the Complexity Theory (or, generally speaking, the complexity sciences) have been applied as a perspective for capturing the influence of the context, interaction, and adaption in the innovation processes, such as the ones enabled in the business incubators. The purpose of this paper is to implement a frame of reference for understanding the start-ups’ incubator as a complex system where innovation, learning, and self-organization take place. We build on the interfaces between the Complexity Theory (i.e., complexity sciences) and Open Innovation literature to identify principles, patterns, and conditions that frame the incubation practices as simple rules aimed to sustain the innovation process towards the creation of new ventures. Results from the multiple case studies conducted in five incubators show that the features of variety, nonlinear interaction, interdependence, autonomy, and emergence of the incubation process framed as a complex system are enabled in different ways by the combination of the open innovation practices and services provided by the start-ups’ incubators, including the provision of physical infrastructure, access to funding streams, experts/entrepreneurs networking, education/workshops, mentorship, and advice.
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Brown, P. D., H. K. Edwards et M. W. Fay. « Microscopy at the life sciences / physical sciences interface ». Journal of Physics : Conference Series 241 (1 juillet 2010) : 012019. http://dx.doi.org/10.1088/1742-6596/241/1/012019.
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Shaapur, F. « Feature enhancement by non-uniform ion-milling for SEM of integrated circuits ». Proceedings, annual meeting, Electron Microscopy Society of America 51 (1 août 1993) : 234–35. http://dx.doi.org/10.1017/s0424820100147016.
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A variety of techniques has been developed to enhance the image contrast of EM specimens in both physical and biological sciences. In SEM of materials, feature enhancement is mainly based on augmentation of surface topography by non-uniform material removal from different structural elements and preferential erosion at adjoining interfaces. The enhanced surface topography, in turn, translates into better response to the probing beam resulting in higher image contrast.In cross-sectional imaging by SEM (XSEM) of ICs, feature enhancement has been carried out by chemical or mechanical, i.e., ion-milling, surface treatments. Ion-milling has been used to clean surfaces and to enhance their topography. The non-uniform material removal from the surface, in this case, merely relies on an inherent characteristic of the structural elements, i.e., their relative erosion rates during the ion-thinning. An additional factor, i.e., minimization of the “shadowing” effect by adjusting the orientation of ion incidence may also be used to elevate the non-uniform ion-milling even further.
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Kassen, Stefan, Holger Tammen, Maximilian Zarte et Agnes Pechmann. « Concept and Case Study for a Generic Simulation as a Digital Shadow to Be Used for Production Optimisation ». Processes 9, no 8 (3 août 2021) : 1362. http://dx.doi.org/10.3390/pr9081362.
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Optimising an existing production plant is a challenging task for companies. Necessary physical test runs disturb running production processes. Simulation models are one opportunity to limit these physical test runs. This is particularly important since today’s fast and intelligent networking opportunities in production systems are in line with the call of Industry 4.0 for substantial and frequent changes. Creating simulation models for those systems requires high effort and in-depth knowledge of production processes. In the current literature, digital twins promise several advantages for production optimisation and can be used to simulate production systems, which reduce necessary physical test runs and related costs. While most companies are not able to create digital twins yet, companies using enterprise resource planning (ERP) systems have the general capability to create digital shadows. This paper presents a concept and a case study for a generic simulation of production systems in AnyLogic™ to create digital shadows as the first step towards a full digital twin. The generic simulation visualises production systems automatically and displays key performance indicators (KPIs) for the planned production program, using representational state transfer (REST) interfaces to extract product and production data from an ERP system. The case study has been applied in a learning factory of the University of Applied Life Sciences Emden/Leer. The results prove the presented concept of the generic simulation and show the limits and challenges of working with generic simulation models.
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Leone, Davide. « U’Game – a toolkit for urban gaming ». Interaction Design and Architecture(s), no 40 (15 avril 2019) : 57–68. http://dx.doi.org/10.55612/s-5002-040-004.
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This paper is about a pervasive game factory based in Palermo. The main issue is to highlight the main features of these productions in generating new interfaces and new access keys to the heritage. The paper describes the point of view of this small society focuses about the connection between real world and world of games using both physical an digital supports. The text focuses on three games produced inside a participatory process arguing the role of urban and pervasive games as a citizenship tool.
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Massaglia, Stefano, Valentina Maria Merlino, Antonino Sparacino, Giulia Mastromonaco et Danielle Borra. « Differences in retailer interfaces in assortment planning and communication strategies for homogenized baby food products ». AIMS Agriculture and Food 8, no 2 (2023) : 305–28. http://dx.doi.org/10.3934/agrfood.2023017.
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<abstract> <p>This research analyzed the assortment size and depth, marketing characteristics, price policies and communication strategies in large-retail chains and online distributions for homogenized baby food. Comparisons of the assortment composition were made considering defined product categories based on the composition formula, specialty product, claims, product origin and packaging material. Prices differences were also assessed comparing the different retailer formats (supermarket, hypermarket, convenience store and discount). The main findings highlighted significant differences in the assortment planning decisions. In particular, direct sales seem to be more oriented towards providing a wide range of products together with more information on products healthiness and origin; online sales, on the other hand, focus its assortment planning decision on supplying products with high added value in composition and price: in fact, the extra communication of additional information regarding the product nutritional characteristics and certifications, as well as expert advice, characterized the majority of the explored websites. About the promotion, in the physical stores, more convenience packs have been used, while more discounts were applied directly to the online sale price. This research provides concrete tools to marketing managers to improve the planning and communication strategies of infant formula of homogenized products for a differentiated and successful sales policy. At the same time, producers can make a more informed and dynamic choice on the distribution chain that can best match the company's offer.</p> </abstract>
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Chen, Min-Bo. « Preface ». Pure and Applied Chemistry 77, no 11 (1 janvier 2005) : iv. http://dx.doi.org/10.1351/pac20057711iv.
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The 17th International Conference on Physical Organic Chemistry (ICPOC-17) is the latest event in a regular IUPAC-sponsored series, and took place in Shanghai, China on 15ñ20 August 2004 under the local auspices of the Chinese Academy of Sciences and the Chinese Chemical Society.About 200 delegates attended ICPOC-17 from 21 countries, to participate in a scientific program comprising 14 plenary and 17 invited lectures, 41 contributed lectures, and 53 posters. The ongoing importance of the conference theme is reflected in a range of topics that serve to underpin fundamental principles of the subject, whilst also addressing new and evolving challenges posed by the growing interdisciplinary interfaces. This interdependence is exemplified by the centrality of mechanistic insight in modern synthesis, the interpretive and predictive power of theoretical studies, and the indispensable role of physical organic principles in studies of organized matter and biological systems, all of which featured prominently in the program.Proceedings of this series of conferences are traditionally published in Pure and Applied Chemistry, and it is pleasing to introduce a representative selection of outstanding works based upon plenary lectures delivered at ICPOC-17. Mechanistic studies form the subject of papers by H. Mayr (Ludwig-Maximilians University, Munich, Germany), V. D. Parker (Utah State University, Logan, UT, USA), and M. Eckert-Maksic (Rudjer Boskovic Institute, Zagreb, Croatia), whilst those of F. Diederich (ETH, Zurich, Switzerland) and C. J. Easton (Australian National University, Canberra, Australia) address fundamental aspects of materials sciences. Biological themes feature in works by F. M. Menger (Emory University, Atlanta, GA, USA), Zhong-Li Liu (Lanzhou University, China), and A. Pross (Ben Gurion University of the Negev, Beer Sheva, Israel).Collectively, these papers exemplify the vigor and topicality of the overall scientific proceedings of ICPOC-17, and convey something of the diversity of themes that characterize current and future challenges in physical organic chemistry. This important forum will reconvene in Warsaw on 20ñ25 August 2006 for the 18th International Conference on Physical Organic Chemistry (ICPOC-18), and it is confidently expected that this record will serve the needs of practicing scientists, and offer inspiration and insight for future advances that may be reported on that occasion.Min-Bo ChenConference Editor
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Perica, Tina, Yasushi Kondo, Sandhya P. Tiwari, Stephen H. McLaughlin, Katherine R. Kemplen, Xiuwei Zhang, Annette Steward, Nathalie Reuter, Jane Clarke et Sarah A. Teichmann. « Evolution of oligomeric state through allosteric pathways that mimic ligand binding ». Science 346, no 6216 (18 décembre 2014) : 1254346. http://dx.doi.org/10.1126/science.1254346.
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Evolution and design of protein complexes are almost always viewed through the lens of amino acid mutations at protein interfaces. We showed previously that residues not involved in the physical interaction between proteins make important contributions to oligomerization by acting indirectly or allosterically. In this work, we sought to investigate the mechanism by which allosteric mutations act, using the example of the PyrR family of pyrimidine operon attenuators. In this family, a perfectly sequence-conserved helix that forms a tetrameric interface is exposed as solvent-accessible surface in dimeric orthologs. This means that mutations must be acting from a distance to destabilize the interface. We identified 11 key mutations controlling oligomeric state, all distant from the interfaces and outside ligand-binding pockets. Finally, we show that the key mutations introduce conformational changes equivalent to the conformational shift between the free versus nucleotide-bound conformations of the proteins.
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Weiss, François, Marc Audier, Ausrine Bartasyte, Daniel Bellet, Cécile Girardot, Carmen Jimenez, Jens Kreisel, Stéphane Pignard, Mathieu Salaun et Céline Ternon. « Multifunctional oxide nanostructures by metal-organic chemical vapor deposition (MOCVD) ». Pure and Applied Chemistry 81, no 8 (31 juillet 2009) : 1523–34. http://dx.doi.org/10.1351/pac-con-08-08-10.
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The development of thin films, in the context of ongoing reduction in the size of electronic systems, poses challenging questions for the materials sciences of multifunctional nanostructures. These include the limits of size reduction, integration of heterogeneous functions, and system characterization or process control at an atomic scale. We present here different studies devoted to perovskite oxide materials (or materials with derived structure), where in specific directions of the crystal structure the atomic organization decreases down to a few nanometers, thus building nanostructures. In these materials, very original physical phenomena are observed in multilayers or superlattices, nanowires (NWs) or nanodots, mainly because strain, surfaces, and interfaces play here a predominant role and can tune the physical properties. Metal-organic chemical vapor deposition (MOCVD) routes have been used for the synthesis of oxide materials. We first introduce the basic rules governing the choice of metal-organic precursors for the MOCVD reaction. Next we discuss the principles of the pulsed injection MOCVD system. A laser-assisted MOCVD system, designed to the direct growth of 2D and 3D photonic structures, will also be described. Selected case studies will finally be presented, illustrating the powerful development of different oxide nanostructures based on dielectric, ferroelectric, or superconducting oxides, manganites, and nickelates, as well as first results related to the growth of ZnO NWs.
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Kashapov, Ruslan, et Lucia Zakharova. « The Self-Assembly and Design of Polyfunctional Nanosystems ». International Journal of Molecular Sciences 22, no 4 (23 février 2021) : 2223. http://dx.doi.org/10.3390/ijms22042223.
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The current task of the molecular sciences is to create unique nanostructured materials with a given structure and with specific physicochemical properties on the basis of the existing wide range of molecules of natural and synthetic origin. A promising and inexpensive way to obtain nanostructured materials is the spontaneous self-assembly of molecular building blocks during random collisions in real dispersive systems in solution and at interfaces. This editorial aims to summarize the major points from the 11 scientific papers that contributed to the special issue “The Self-Assembly and Design of Polyfunctional Nanosystems”, assessing the modern self-assembly potential and strategies for maintaining sustainable development of the nanoindustry.
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Rofallski, Robin, et Thomas Luhmann. « An Efficient Solution to Ray Tracing Problems in Multimedia Photogrammetry for Flat Refractive Interfaces ». PFG – Journal of Photogrammetry, Remote Sensing and Geoinformation Science 90, no 1 (mars 2022) : 37–54. http://dx.doi.org/10.1007/s41064-022-00192-1.
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AbstractUnderstanding and considering refraction effects are important parts of the demanding task of multimedia photogrammetry, especially with planar interfaces, so-called ”flat ports”. Yet, it remains challenging to determine reliable calibration results that are both quickly acquired and physically interpretable. In this contribution, a novel object-based optimization algorithm, relying on ray tracing methods, is introduced. It enables calibrating physical parameters of all involved refractive properties with reduced computational effort, compared to other standard algorithms in ray tracing. We show that this solution produces equally accurate results as other ray tracing approaches while improving processing speed by a factor of approximately ten and providing a statistical metric in object space. Furthermore, we show in a laboratory investigation that explicit calibration of refractive properties is crucial even with orthogonally aligned bundle-invariant interfaces for highest accuracy, as accuracy in object space is decreased by about 10% with implicit calibration. With deviation from orthogonality by about ten degrees this decreases even further to almost no useful results and accuracy loss of more than 50% compared to explicit calibration results.
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Kögel, Johannes, et Gregor Wolbring. « What It Takes to Be a Pioneer : Ability Expectations From Brain-Computer Interface Users ». NanoEthics 14, no 3 (10 novembre 2020) : 227–39. http://dx.doi.org/10.1007/s11569-020-00378-0.
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AbstractBrain-computer interfaces (BCIs) are envisioned to enable new abilities of action. This potential can be fruitful in particular when it comes to restoring lost motion or communication abilities or to implementing new possibilities of action. However, BCIs do not come without presuppositions. Applying the concept of ability expectations to BCIs, a wide range of requirements on the side of the users becomes apparent. We examined these ability expectations by taking the example of therapeutic BCI users who got enrolled into BCI research studies due to particular physical conditions. Some of the expectations identified are quite explicit, like particular physical conditions and BCI “literacy”. Other expectations are more implicit, such as motivation, a high level of concentration, pain tolerance, emotion control and resources. These expectations may produce a conception of the human and a self-understanding among BCI users that objectify the body in favour of a brain-centred, cerebral notion of the subject which also plays its part in upholding a normality regime.
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de Jonge, L. W., P. Moldrup et P. Schjønning. « Soil Infrastructure, Interfaces and Translocation Processes in Inner Space (''Soil-it-is'') : towards a road map for the constraints and crossroads of soil architecture and biophysical processes ». Hydrology and Earth System Sciences Discussions 6, no 2 (25 mars 2009) : 2633–78. http://dx.doi.org/10.5194/hessd-6-2633-2009.
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Abstract. Soil functions and their impact on health, economy and the environment are evident at the macro scale but determined at the micro scale, based on interactions between soil micro-architecture and the transport and transformation processes occurring in the pore and particle networks and at their interfaces. Soil structure formation and its resilience to disturbance are highly dynamic features affected by management (energy input), moisture (matric potential), and solids composition and complexation (organic carbon, OC, and clay interactions). In this paper we review and put into perspective preliminary results of the newly started research program ''Soil-it-is'' on functional soil architecture. To identify and quantify biophysical constraints on soil structure changes and resilience, we claim that new paradigms are needed to better interpret processes and parameters measured at the bulk soil scale and their links to the seemingly chaotic soil inner space behavior at the micro scale (soil self-organization). As a first step, we revisit the soil matrix (solids phase) and pore system (water and air phases), constituting the complementary and interactive networks of soil infrastructure. For a field-pair with contrasting soil management, we suggest new ways of data analysis on measured soil-gas transport parameters at different moisture conditions to evaluate controls of soil matrix and pore network formation. Results imply that some soils form sponge-like pore networks (mostly healthy soils in terms of environmental functions), while other soils form pipe-like structures (poorly functioning soils), with the difference related to both complexation of organic matter and degradation of soil structure. The recently presented Dexter threshold (ratio of clay to organic carbon of 10 g g−1) is found to be a promising constraint for a soil's ability to maintain or regenerate functional structure. Next, we show the Dexter threshold may also apply to hydrological and physical-chemical interface phenomena including soil-water repellency and sorption of volatile organic vapors (gas-water-solids interfaces) as well as polycyclic aromatic hydrocarbons (water-solids interfaces). However, data for differently-managed soils imply that energy input, soil-moisture status, and vegetation (quality of eluded organic matter) may be equally important constraints together with the complexation and degradation of organic carbon in deciding functional soil architecture and interface processes. Finally, we envision a road map to soil inner space where we search for the main controls of particle and pore network changes and structure build-up and resilience at each crossroad of biophysical parameters, where, for example, complexation between organic matter and clay, and moisture-induced changes from hydrophilic to hydrophobic surface conditions can play a role. We hypothesize that each crossroad (e.g. between OC/clay ratio and matric potential) may initiate breakdown or activation of soil self-organization at a given time as affected by gradients in energy and moisture from soil use and climate. The road map may serve as inspiration for renewed and multi-disciplinary focus on functional soil architecture.
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Yang, Ying, Tim Dwyer, Michael Wybrow, Benjamin Lee, Maxime Cordeil, Mark Billinghurst et Bruce H. Thomas. « Towards immersive collaborative sensemaking ». Proceedings of the ACM on Human-Computer Interaction 6, ISS (14 novembre 2022) : 722–46. http://dx.doi.org/10.1145/3567741.
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When collaborating face-to-face, people commonly use the surfaces and spaces around them to perform sensemaking tasks, such as spatially organising documents, notes or images. However, when people collaborate remotely using desktop interfaces they no longer feel like they are sharing the same space. This limitation may be overcome through collaboration in immersive environments, which simulate the physical in-person experience. In this paper, we report on a between-groups study comparing collaborations on image organisation tasks, in an immersive Virtual Reality (VR) environment to more conventional desktop conferencing. Collecting data from 40 subjects in groups of four, we measured task performance, user behaviours, collaboration engagement and awareness. Overall, the VR and desktop interface resulted in similar speed, accuracy and social presence rating, but we observed more conversations and interaction with objects, and more equal contributions to the interaction from participants within groups in VR. We also identified differences in coordination and collaborative awareness behaviours between VR and desktop platforms. We report on a set of systematic measures for assessing VR collaborative experience and a new analysis tool that we have developed to capture user behaviours in collaborative setting. Finally, we provide design considerations and directions for future work.
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Fayad, Jacky, Gilbert Accary, Frédéric Morandini, François-Joseph Chatelon, Lucile Rossi, Thierry Marcelli, Dominique Cancellieri et al. « Numerical Assessment of Safe Separation Distance in the Wildland–Urban Interfaces ». Fire 6, no 5 (18 mai 2023) : 209. http://dx.doi.org/10.3390/fire6050209.
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A safe separation distance (SSD) needs to be considered during firefighting activities (fire suppression or people evacuation) against wildfires. The SSD is of critical interest for both humans and assets located in the wildland–urban interfaces (WUI). In most cases, the safety zone models and guidelines assume a flat terrain and only radiant heating. Nevertheless, injuries or damage do not result exclusively from radiant heating. Indeed, convection must be also considered as a significant contribution of heat transfer, particularly in the presence of the combined effects of sloping terrain and a high wind velocity. In this work, a critical case study is considered for the village of Sari-Solenzara in Corsica (France). This site location was selected by the operational staff since high-intensity fire spread is likely to occur in the WUI during wind-blown conditions. This study was carried out for 4 m high shrubland, a sloping terrain of 12° and a wind speed of 16.6 m/s. The numerical simulations were performed using a fully physical fire model, namely, FireStar2D, to investigate a case of fire spreading, which is thought to be representative of most high wildfire risk situations in Corsica. This study is based on the evaluation of the total (radiative and convective) heat flux received by two types of targets (human bodies and buildings) located ahead of the fire front. The results obtained revealed that the radiation was the dominant heat transfer mode in the evaluation of the SSD. In addition, the predictions were consistent with the criterion established by the operational experts, which assumes that in Corsica, a minimum SSD of 50 m is required to keep an equipped firefighter without injury in a fuelbreak named ZAL. This numerical work also provides correlations relating the total heat flux to the SSD.
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Washington, Peter, Karina G. Samuel-Gama, Shirish Goyal, Ashwin Ramaswami et Ingmar H. Riedel-Kruse. « Interactive programming paradigm for real-time experimentation with remote living matter ». Proceedings of the National Academy of Sciences 116, no 12 (1 mars 2019) : 5411–19. http://dx.doi.org/10.1073/pnas.1815367116.
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Recent advancements in life-science instrumentation and automation enable entirely new modes of human interaction with microbiological processes and corresponding applications for science and education through biology cloud laboratories. A critical barrier for remote and on-site life-science experimentation (for both experts and nonexperts alike) is the absence of suitable abstractions and interfaces for programming living matter. To this end we conceptualize a programming paradigm that provides stimulus and sensor control functions for real-time manipulation of physical biological matter. Additionally, a simulation mode facilitates higher user throughput, program debugging, and biophysical modeling. To evaluate this paradigm, we implemented a JavaScript-based web toolkit, “Bioty,” that supports real-time interaction with swarms of phototacticEuglenacells hosted on a cloud laboratory. Studies with remote and on-site users demonstrate that individuals with little to no biology knowledge and intermediate programming knowledge were able to successfully create and use scientific applications and games. This work informs the design of programming environments for controlling living matter in general, for living material microfabrication and swarm robotics applications, and for lowering the access barriers to the life sciences for professional and citizen scientists, learners, and the lay public.
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Stolz, Bernadette J., Jared Tanner, Heather A. Harrington et Vidit Nanda. « Geometric anomaly detection in data ». Proceedings of the National Academy of Sciences 117, no 33 (3 août 2020) : 19664–69. http://dx.doi.org/10.1073/pnas.2001741117.
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The quest for low-dimensional models which approximate high-dimensional data is pervasive across the physical, natural, and social sciences. The dominant paradigm underlying most standard modeling techniques assumes that the data are concentrated near a single unknown manifold of relatively small intrinsic dimension. Here, we present a systematic framework for detecting interfaces and related anomalies in data which may fail to satisfy the manifold hypothesis. By computing the local topology of small regions around each data point, we are able to partition a given dataset into disjoint classes, each of which can be individually approximated by a single manifold. Since these manifolds may have different intrinsic dimensions, local topology discovers singular regions in data even when none of the points have been sampled precisely from the singularities. We showcase this method by identifying the intersection of two surfaces in the 24-dimensional space of cyclo-octane conformations and by locating all of the self-intersections of a Henneberg minimal surface immersed in 3-dimensional space. Due to the local nature of the topological computations, the algorithmic burden of performing such data stratification is readily distributable across several processors.
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Li, Da, Yun Luo, Delphine Onidas, Li He, Ming Jin, Florence Gazeau, Jean Pinson et Claire Mangeney. « Surface functionalization of nanomaterials by aryl diazonium salts for biomedical sciences ». Advances in Colloid and Interface Science 294 (août 2021) : 102479. http://dx.doi.org/10.1016/j.cis.2021.102479.
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Bermejo, Carlos, Lik Hang Lee, Paul Chojecki, David Przewozny et Pan Hui. « Exploring Button Designs for Mid-air Interaction in Virtual Reality : A Hexa-metric Evaluation of Key Representations and Multi-modal Cues ». Proceedings of the ACM on Human-Computer Interaction 5, EICS (27 mai 2021) : 1–26. http://dx.doi.org/10.1145/3457141.
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The continued advancement in user interfaces comes to the era of virtual reality that requires a better understanding of how users will interact with 3D buttons in mid-air. Although virtual reality owns high levels of expressiveness and demonstrates the ability to simulate the daily objects in the physical environment, the most fundamental issue of designing virtual buttons is surprisingly ignored. To this end, this paper presents four variants of virtual buttons, considering two design dimensions of key representations and multi-modal cues (audio, visual, haptic). We conduct two multi-metric assessments to evaluate the four virtual variants and the baselines of physical variants. Our results indicate that the 3D-lookalike buttons help users with more refined and subtle mid-air interactions (i.e. lesser press depth) when haptic cues are available; while the users with 2D-lookalike buttons unintuitively achieve better keystroke performance than the 3D counterparts. We summarize the findings, and accordingly, suggest the design choices of virtual reality buttons among the two proposed design dimensions.
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Santos, Ana C., Carolina Ferreira, Francisco Veiga, António J. Ribeiro, Abhishek Panchal, Yuri Lvov et Anshul Agarwal. « Halloysite clay nanotubes for life sciences applications : From drug encapsulation to bioscaffold ». Advances in Colloid and Interface Science 257 (juillet 2018) : 58–70. http://dx.doi.org/10.1016/j.cis.2018.05.007.
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Crocker, Don. « Database Generated Software Requirements Specification ». INCOSE International Symposium 3, no 1 (juillet 1993) : 359–66. http://dx.doi.org/10.1002/j.2334-5837.1993.tb01600.x.
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AbstractThe goal of software requirements management at Grumman is to provide Systems Engineering's internal and external customers with the right information to produce and evaluate a computer program that meets the system's needs. A valuable approach to requirements management is to model one or more aspects of a system and communicate and control the system and software requirements via a database of the model elements.Engineering models can range from abstract models such as a series of partial differential equations for the solution of harmonic vibrations to isomorphic models such as a data flow diagrams or perspective drawings. The modeling method chosen uses a graphical notation and an Entity‐Relationship‐Attribute (ERA) database to create four isomorphic models to define a system and is currently implemented using RDD‐100® from Ascent Logic Corporation.The models used to specify the system are:1) Design Knowledge Capture (DKC) model‐an ERA model of the requirements flowdown from the perceived need to the requirements specification. 2) Behavior model – built using entities that represent functions and items, along with temporal notations of the functional flow. 3) Physical model –sometimes called the system architecture, includes the hierarchical structure of the components that build the system, the interfaces between the components, and the physical links that comprise the interfaces. 4) Resource model‐allows the engineer to evaluate the amount of resources needed when specified behavior is exhibited by a system architecture and to determine the behavior of the system when resources are depleted.The customization of the RDD language and the augmentation of RDD with other tools to add the required capability is described. The elements of the model are mapped from the RDD database to the an expansive interpretation of the Data Item Description for a Software Requirements Specification (DI‐MCCR‐80025A). The interpretation is based on interchanges between the requirements provider and the requirements implementor.The paper describes the aspects of systems specified using the database of models method. The method is heavily driven by the need to meet the MIL‐STD 2167A requirements for a Software Requirements Specification. However; the main value of this paper may be in the identification of the information produced while engineering the system that is not in the Systems Requirements Specification (SRS).
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Thomas, Gareth. « Role of EM in interface science and engineering ». Proceedings, annual meeting, Electron Microscopy Society of America 50, no 1 (août 1992) : 208–9. http://dx.doi.org/10.1017/s0424820100121442.
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The world of materials is a world of interfaces. Indeed many technologically significant materials have properties both physical and mechanical which are determined by the structure, composition, and bonding of the interfaces within these materials. Thus, electron microscopy and microanalysis, with its high resolution and specificity of information, is one of the key methods needed for characterization. Imaging can be done by amplitude contrast but is limited by the factor g • R (where R is a displacement vector), or resolution in phase contrast, and in today's modern instruments atomic arrangements can be imaged directly, both in plan and cross-sectional views. Beautiful examples are now being published. However so far, few developments to utilize this information for materials design have been forthcoming. On the other hand, interface or intergranular phases are very important in many metallurgical and ceramic systems. In fact many materials are composites of one kind or another and composites involving intergranular phases are an important group of such materials.
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Bochsler, P., M. A. Lee, R. Karrer, L. K. Jian, L. Ellis, C. J. Farrugia, A. B. Galvin et al. « Diagnostics of corotating interaction regions with the kinetic properties of iron ions as determined with STEREO/PLASTIC ». Annales Geophysicae 28, no 2 (9 février 2010) : 491–97. http://dx.doi.org/10.5194/angeo-28-491-2010.
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Abstract. STEREO/PLASTIC determines three-dimensional distributions of solar wind iron ions with unprecedented time resolution. Typically 300 to 1000 counts are registered within each 5 min time interval. For the present study we use the information contained in these distributions to characterize CIRs (Corotating Interaction Regions) in two test cases. We perform a consistency test for both the derived physical parameters and for the analytical model of CIRs of Lee (2000). At 1 AU we find that apart from compositional changes the most indicative parameter for marking the time when a CIR passes a spacecraft is the angular deflection of the flow vector of particles. Changes in particle densities and the changes in magnitudes of speeds are apparently less reliable indicators of stream interfaces.
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Kogelbauer, I., et W. Loiskandl. « Characterization of sediment layer composition in a shallow lake : from open water zones to reed belt areas ». Hydrology and Earth System Sciences Discussions 11, no 11 (13 novembre 2014) : 12627–57. http://dx.doi.org/10.5194/hessd-11-12627-2014.
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Abstract. Lake sediment characterization, a pre-requirement for the vulnerability assessment of lake ecosystems, demands reliable in situ methods for the characterization of the sediment layer composition. A unified characterization of lake sediments within different lake ecotopes (open water, open water patches within the reed, and the reed) is still a challenge. Each ecotope is covered by different classical scientific disciplines (hydrography and terrestrial remote sensing to soil physics) with their specific characterization methods. However, a complementary tool that bridges the gap between land- and hydrographic surveying methods is still missing. Therefore a combination of soil physical sensors (a capacitive sensor and a cone penetrometer) in a measuring system (CSPS) was introduced. CSPS is a non-acoustic device for the rapid in situ delineation of water-mud-consolidated lakebed interfaces. The system was successfully applied across the different ecotopes at the Neusiedler See, a well-mixed shallow lake rich in fine-grained sediments. The geo-referenced vertical CSPS profiles show ecotope-specific layer composition. The effect of wind induced turbidity, particle size, and electrical conductivity were analysed. The water–mud interface was precisely delineated at the open water due to a persistent high water content gradient, equivalent to a lutocline. The penetration resistance for open water showed either a shallow and highly-compacted consolidated lakebed or a consolidated lakebed with a partially compacted layer above; while in the reed the penetration resistance smoothly increased until reaching the deepest penetration depths.
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Dardzinski, Derek, Maituo Yu, Saeed Moayedpour et Noa Marom. « Best practices for first-principles simulations of epitaxial inorganic interfaces ». Journal of Physics : Condensed Matter 34, no 23 (1 avril 2022) : 233002. http://dx.doi.org/10.1088/1361-648x/ac577b.
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Abstract At an interface between two materials physical properties and functionalities may be achieved, which would not exist in either material alone. Epitaxial inorganic interfaces are at the heart of semiconductor, spintronic, and quantum devices. First principles simulations based on density functional theory (DFT) can help elucidate the electronic and magnetic properties of interfaces and relate them to the structure and composition at the atomistic scale. Furthermore, DFT simulations can predict the structure and properties of candidate interfaces and guide experimental efforts in promising directions. However, DFT simulations of interfaces can be technically elaborate and computationally expensive. To help researchers embarking on such simulations, this review covers best practices for first principles simulations of epitaxial inorganic interfaces, including DFT methods, interface model construction, interface structure prediction, and analysis and visualization tools.
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Romanov, O. I., I. V. Svyd, N. I. Korniienko et A. O. Romanov. « Optical Network Management by ONOS-Based SDN Controller ». Radiotekhnika, no 210 (28 septembre 2022) : 188–96. http://dx.doi.org/10.30837/rt.2022.3.210.16.
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The possibilities to manage the optical network with a logically centralized SDN control plane based on the Open Network Operating System (ONOS) are investigated. The structure of the controller and its main functional blocks are considered ensuring the collection of information about the state of network elements, the solution of the main control tasks, interaction of control systems built on different technological bases, are considered. The role and place of the open network operating system in the controller structure are shown, the description of the ONOS multilevel architecture in the form of a set of functional modules is given, the purpose and functions of the ONOS subsystems are analyzed, protocols and interfaces making it possible to present the SDN network as a model are described. The peculiarity of the model is that the managed network can be represented as a set of virtual network functions. Therefore, the control process becomes independent of which vendor's equipment was used to build the network, as well as whether the network is built on real physical elements or virtual ones. Using the ONOS allows you to build a logical centralized control plane in the SDN networks. The existing set of functional modules, services and interfaces in the ONOS allows you to perform optical network management tasks. For the further development of the ONOS, it is necessary to develop mathematical models and methods for the optimal solution of control problems in various operating conditions, which will become application-level software modules in the future.
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Satulu, Veronica, Bogdana Mitu, Valentin Ion, Valentina Marascu, Elena Matei, Cristian Stancu et Gheorghe Dinescu. « Combining Fluorinated Polymers with Ag Nanoparticles as a Route to Enhance Optical Properties of Composite Materials ». Polymers 12, no 8 (23 juillet 2020) : 1640. http://dx.doi.org/10.3390/polym12081640.
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Polymer-based nanocomposites have recently received considerable attention due to their unique properties, which makes them feasible for applications in optics, sensors, energy, life sciences, etc. The present work focuses on the synthesis of nanocomposites consisting of a polytetrafluorethylene-like matrix in which metallic nano-silver are embedded, by using multiple magnetron plasmas. By successively exposing the substrate to separate RF magnetrons using as combination of target materials polytetrafluorethylene (PTFE) and silver, individual control of each deposition process is insured, allowing obtaining of structures in which silver nanoparticles are entrapped in-between two PTFE layers with given thicknesses. The topographical and morphological characteristics investigated by means of Scanning Electron Microscopy and Atomic Force Microscopy techniques evidenced the very presence of Ag nanoparticles with typical dimension 7 nm. The chemical composition at various depositing steps was evaluated through X-ray Photoelectron Spectroscopy. We show that the presence of the top PTFE layer prevents silver oxidation, while its thickness allows the tailoring of optical properties, as evidenced by spectroellipsometry. The appearance of chemical bonds between silver atoms and PTFE atoms at interfaces is observed, pointing out that despite of pure physical deposition processes, a chemical interaction between the polymeric matrix and metal is promoted by plasma.
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Johra, Hicham, Ekaterina Aleksandrova Petrova, Lasse Rohde et Michal Zbigniew Pomianowski. « Digital Twins of Building Physics Experimental Laboratory Setups for Effective E-learning ». Journal of Physics : Conference Series 2069, no 1 (1 novembre 2021) : 012190. http://dx.doi.org/10.1088/1742-6596/2069/1/012190.
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Abstract Hands-on experiments in laboratories are fundamental educational tools for technical sciences. However, laboratories are expensive and not always accessible to students: lockdown and in-person meeting restrictions due to the ongoing Covid-19 pandemic, distant location of teachers and students, facilities used for higher-priority purposes. Moreover, creating specific experimental setups for teaching only can be costly. In that context, digitalizing laboratory setups provides an attractive teaching alternative for remote e-learning. Digital twins are not meant to replace real-world experiments but should enable flexible teaching and effective learning at a lower cost. They complement physical setups and can be virtual extensions, allowing for larger and more complex study cases. e-learning is now popular and many educational institutions provide open-access videos of entire courses. However, the digitalization of practical exercises for engineering is yet limited. The e-learning effort presented in this paper aims to establish a series of digital twins of experimental setups for teaching building physics, energy in buildings and indoor environment. The development of the two first digital twins is detailed here. They are designed for teaching operation and balancing hydronic heating systems. Their numerical models and graphical user interfaces are created with the LabVIEW programming environment.
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Jamali, Anees Muhammad, Shahmurad Chandio et Mujeeb-u.-Rahman Maree. « Acceptance of IoT by Students in Universities of Sindh, Pakistan : A Proposed Framework ». Journal of Applied Engineering & ; Technology (JAET) 7, no 2 (31 décembre 2023) : 83–99. http://dx.doi.org/10.55447/jaet.07.02.127.
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The Internet of Things (IoT) encompasses a convergence of physical and virtual technologies, connecting devices through networks to enhance the overall quality of life. These technologies offer diverse interactions, featuring unique user interfaces and functionalities. Beyond its technological prowess, IoT presents contemporary methodologies and tools, catering to both modern and traditional learning approaches. While IoT components have received considerable attention, there exists a notable gap in exploring factors influencing students' receptiveness to these services. This research centers on the Unified Theory of Acceptance and Use of Technology (UTAUT 2), a widely acknowledged framework for assessing user willingness to adopt new technologies. The primary objective of our pilot study is to establish a conceptual framework based on UTAUT 2 and assess its reliability and validity. This framework sets the stage for future investigations into IoT acceptance among higher education students in Pakistan. To achieve this, an online pilot research questionnaire was distributed via Google Forms to students across various institutions, including the University of Karachi, University of Sindh Jamshoro, University of Sufism and Modern Sciences Bhitshah, Government College University Hyderabad, and SALU Khairpur. Fifty participants completed the questionnaire, and the ensuing data attests to the questionnaire's high reliability (ranging from .795 to .961), affirming its suitability for broader surveys.
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Stutzmann, Grace E., et Ian Parker. « Dynamic Multiphoton Imaging : A Live View from Cells to Systems ». Physiology 20, no 1 (février 2005) : 15–21. http://dx.doi.org/10.1152/physiol.00028.2004.
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Leaps in scientific technology often occur at the interface of seemingly disparate disciplines. This holds true with the recent application of multiphoton microscopy to the biological sciences, leading to a new generation of imaging-based studies extending from the tracking of individual molecules within living cells to the observation of whole organisms.
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Li, Keran, et Yan Lin. « Exploring the Correlation between Streetscape and Economic Vitality Using Machine Learning : A Case Study in the Old Urban District of Xuzhou, China ». ISPRS International Journal of Geo-Information 12, no 7 (4 juillet 2023) : 267. http://dx.doi.org/10.3390/ijgi12070267.
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The streetscapes of old urban districts record the changes in urban space and the vitality of socio-economic entities like storefronts. However, prior studies of urban vitality have preferred the demand end of crowd agglomeration to the supply end of commercial businesses, while the refined application of street-view images (SVIs) and the spatial heterogeneity resulting from sectional differences among elements deserve further research. Under this context, this paper took both the alive and the closed storefronts as the objects and developed an analytical framework based on machine learning and SVIs to analyze the characteristics of the streetscape and the economic vitality, followed by a regression analysis between them with a multiscale geographically weighted regression (MGWR) model. Our findings comprise three aspects: (1) despite the sum of the storefronts being more often used, combining the alive and the closed businesses is beneficial to reflect the real economic vitality; (2) as a reflection of the spatial heterogeneity and sectional differences of elements, the asymmetric streetscape has a significant influence on the economic vitality; and (3) although different factors from the streetscape can influence economic vitality differently, based on varied proxies of the vitality, three factors, namely, higher difference value of the signboards, higher sum of glass interfaces, and lower difference value of the glass interfaces, can benefit the economic vitality. This research can support urban physical examination and the regeneration of old urban districts for urban planners, designers, and decision-makers, and provide new perspectives and proxies as well as a more fine-grained analysis among the traditional studies on economic vitality.
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Hoff, Charles. « The Interface Between Physical Anthropology and Medical Genetics ». Practicing Anthropology 8, no 1-2 (1 janvier 1986) : 10–12. http://dx.doi.org/10.17730/praa.8.1-2.33340m040505711v.
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By the 1950s, revolutionary advances in the basic biological sciences began to have a significant impact on the theory, methods, scientific rigor and scope of physical anthropology. The first of these was the development of Neo-Darwinian evolutionary theory which integrated Medelian genetics, Pearsonian biometrics, evolution by mutation, drift and natural selection, and incorporated these and other genetic concepts into a unified quantitative evolutionary model.
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Williams, David B. « Impact of Energy-Dispersive Spectrometry in Materials Science Microanalysis ». Microscopy and Microanalysis 4, no 6 (décembre 1998) : 567–75. http://dx.doi.org/10.1017/s1431927698980540.
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X-ray microanalysis of materials using energy-dispersive spectrometry (EDS) has made the greatest impact in studies of compositional changes at atomic-level interfaces. The small physical dimensions of the silicon detector make EDS the X-ray analyzer of choice for analytical transmission electron microscopy (AEM). X-ray analysis of thin foils in the AEM has contributed to our understanding of elemental segregation to interphase interfaces and grain boundaries, as well as other planar defects. Measurement of atomic diffusion on a small scale close to interphase interfaces has permitted determination of substitutional atomic diffusivities several orders of magnitude smaller than previously possible and has also led to the determination of low-temperature equilibrium phase diagrams through the measurement of local interface compositions. Elemental segregation to grain boundaries is responsible for such deleterious behavior as temper embrittlement, stress-corrosion cracking, and other forms of intergranular failure. On the other hand, segregation can bring about improvement in behavior: sintering aids in ceramics and de-embrittlement of intermetallics. EDS in the AEM has been responsible for quantitative analysis of all aspects of the segregation process and, more recently, in combination with electron energy-loss spectrometry (EELS) has given insight into why boundary segregation results in such significant macroscopic changes in properties.