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Littérature scientifique sur le sujet « Concave cube »

Auteur : Grafiati

Publié le 9 mars 2023

Mis à jour le 10 mars 2023

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Articles de revues sur le sujet "Concave cube"

Huang, Caijin, Zhen Long, Masahiro Miyauchi et Xiaoqing Qiu. « A facile one-pot synthesis of Cu–Cu2O concave cube hybrid architectures ». CrystEngComm 16, n^o 23 (2014) : 4967–72. http://dx.doi.org/10.1039/c4ce00250d.

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Yin, Zhiqiang, Zhenguo Shao, Chao Qi, Haoyuan Wu, Jianen Wang et Lulu Gao. « Static Compressive Properties of Polypropylene Fiber Foam Concrete with Concave Hexagonal Unit Cell ». Applied Sciences 13, n^o 1 (22 décembre 2022) : 132. http://dx.doi.org/10.3390/app13010132.

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For the purpose of studying the influence of fiber on the negative Poisson’s ratio effect of foam concrete, a concave hexagonal unit cell structure of polypropylene fiber foam concrete was proposed. The effects of different fiber volume contents on the structural mechanical parameters, Poisson’s ratio, and energy absorption capacity of the unit cells were studied by static compression of concave hexagonal unit cells and cube specimens. The results show that the compressive strength of foam concrete is reduced by adding polypropylene fiber, and the peak stress of concave hexagonal unit cells decreases less rapidly than that of cube specimens. The proper amount of polypropylene fiber can enhance the deformation ability of the unit cells in foam concrete, and the Poisson’s ratio of the unit cells in foam concrete with 1.5% fiber content is the lowest. In the process of failure of concave hexagonal unit cells, the failure phenomenon is mainly concentrated on the concave surfaces on both sides, and the cracks are distributed in the form of “upper left and lower right” or “lower left and upper right”. When the content of polypropylene fiber is 0.5%, the total energy absorbed by the concave hexagonal cells in the compression deformation process increases by 12.98%.

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Liu, Tao, Zhixiang Fang, Qingzhou Mao, Qingquan Li et Xing Zhang. « A cube-based saliency detection method using integrated visual and spatial features ». Sensor Review 36, n^o 2 (21 mars 2016) : 148–57. http://dx.doi.org/10.1108/sr-07-2015-0110.

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Purpose The spatial feature is important for scene saliency detection. Scene-based visual saliency detection methods fail to incorporate 3D scene spatial aspects. This paper aims to propose a cube-based method to improve saliency detection through integrating visual and spatial features in 3D scenes. Design/methodology/approach In the presented approach, a multiscale cube pyramid is used to organize the 3D image scene and mesh model. Each 3D cube in this pyramid represents a space unit similar to a pixel in the image saliency model multiscale image pyramid. In each 3D cube color, intensity and orientation features are extracted from the image and a quantitative concave–convex descriptor is extracted from the 3D space. A Gaussian filter is then used on this pyramid of cubes with an extended center-surround difference introduced to compute the cube-based 3D scene saliency. Findings The precision-recall rate and receiver operating characteristic curve is used to evaluate the method and other state-of-art methods. The results show that the method used is better than traditional image-based methods, especially for 3D scenes. Originality/value This paper presents a method that improves the image-based visual saliency model.

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Wu, Chun, Yanan Jiang, Zhiyuan Niu, Dong Zhao, Wenli Pei, Kai Wang et Qiang Wang. « Effects of high magnetic field annealing on FePt nanoparticles with shape-anisotropy and element-distribution-anisotropy ». RSC Advances 11, n^o 18 (2021) : 10463–67. http://dx.doi.org/10.1039/d1ra00072a.

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Zhu, He, Weizhen Xu, Min Shan, Tao Yang, Qinlu Lin, Kexue Yu, Yanxia Xing et Yang Yu. « High-Throughput Color Imaging Hg2+ Sensing via Amalgamation-Mediated Shape Transition of Concave Cube Au Nanoparticles ». Nanomaterials 12, n^o 11 (2 juin 2022) : 1902. http://dx.doi.org/10.3390/nano12111902.

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Mercury, as one type of toxic heavy metal, represents a great threat to environmental and biological metabolic systems. Thus, reliable and sensitive quantitative detection of mercury levels is particularly meaningful for environmental protection and human health. We proposed a high-throughput single-particle color imaging strategy under dark-field microscopy (DFM) for mercury ions (Hg2+) detection by using individual concave cube Au nanoparticles as optical probes. In the presence of ascorbic acid (AA), Hg2+ was reduced to Hg which forms Au–Hg amalgamate with Au nanoparticles, altering their localized surface plasmon resonance (LSPR). Transmission electron microscopy (TEM) images demonstrated that the concave cube Au nanoparticles were approaching to sphere upon increasing the concentration of Hg2+. The nanoparticles underwent an obvious color change from red to yellow, green, and finally blue under DFM due to the shape-evolution and LSPR changes. In addition, we demonstrated for the first time that the LSPR of Au–Hg amalgamated below 400 nm. Inspired by the above-mentioned results, single-particle color variations were digitalized by converting the color image into RGB channels to obtain (green+blue)/red intensity ratios [(G+B)/R]. The concentration-dependence change was quantified by statistically analyzing the (G+B)/R ratios of a large number of particles. A linear range from 10 to 2000 nM (R2 = 0.972) and a limit of detection (LOD) of 1.857 nM were acquired. Furthermore, many other metal ions, like Cu2+, Cr3+, etc., did not interfere with Hg2+ detection. More importantly, Hg2+ content in industrial wastewater samples and in the inner regions of human HepG2 cells was determined, showing great potential for developing a single-particle color imaging sensor in complex biological samples using concave cube Au nanoparticles as optical probes.

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Yoo, Ji-Hyeon, Ho-Jin Jung, Jang-Hyeon Kim, Dae-Han Sim et Han-Ul Yoon. « Solving a Simple Geduldspiele Cube with a Robotic Gripper via Sim-to-Real Transfer ». Applied Sciences 12, n^o 19 (9 octobre 2022) : 10124. http://dx.doi.org/10.3390/app121910124.

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Geduldspiele cubes (also known as patience cubes in English) are interesting problems to solve with robotic systems on the basis of machine learning approaches. Generally, highly dexterous hand and finger movement is required to solve them. In this paper, we propose a reinforcement-learning-based approach to solve simple geduldspiele cubes of a flat plane, a convex plane, and a concave plane. The key idea of the proposed approach is that we adopt a sim-to-real framework in which a robotic agent is virtually trained in simulation environment based on reinforcement learning, then the virtually trained robotic agent is deployed into a physical robotic system and evaluated for tasks in the real world. We developed a test bed which consists of a dual-arm robot with a patience cube in a gripper and the virtual avatar system to be trained in the simulation world. The experimental results showed that the virtually trained robotic agent was able to solve simple patience cubes in the real world as well. Based on the results, we could expect to solve the more complex patience cubes by augmenting the proposed approach with versatile reinforcement learning algorithms.

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Timashova, L. N., et N. N. Kulakova. « Analysis of Interferometer with Micro-Mirror on Beam Splitting Cube ». Herald of the Bauman Moscow State Technical University. Series Instrument Engineering, n^o 3 (136) (septembre 2021) : 129–43. http://dx.doi.org/10.18698/0236-3933-2021-3-129-143.

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The control of the shape of the optical part surface by the interference method has become an integral part of the process of their shaping. With a precisely focused interferometer interferometry allows obtaining an interference pattern similar to a topographic map of the error profile of the wave surface under investigation. The interferometer must form a map of the optical surface with high accuracy --- the permissible distortion of the interference fringe caused by an interferometer error should not exceed 0.1 of the distortion value caused by an error on the examined surface. The dependence of the interference pattern formation on the errors in the arrangement of the interferometer components, i.e., defocusing, was theoretically analyzed using Fourier transforms. The analysis was performed for an interferometer containing a laser illuminator, a concave spherical mirror with a central hole, coaxial to the illuminator, and a beamsplitting element in the form of a cube-prism with a semitransparent hypotenuse face. On the first flat face of the cube-prism, a microspherical concave mirror is made with the center located on the optical axis of the interferometer. A method for calculating the defocusing of a controlled spherical mirror and the corresponding wave aberration of the working wavefront is presented. An example of calculating the design parameters of the interferometer and the permissible defocusing of the controlled spherical mirror is given

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Sarker, Satya Ranjan, Shakil Ahmed Polash, Md Nurul Karim, Tanushree Saha, Chaitali Dekiwadia, Vipul Bansal, Ylias Sabri, Ahmad E. Kandjani et Suresh K. Bhargava. « Functionalized Concave Cube Gold Nanoparticles as Potent Antimicrobial Agents against Pathogenic Bacteria ». ACS Applied Bio Materials 5, n^o 2 (7 février 2022) : 492–503. http://dx.doi.org/10.1021/acsabm.1c00902.

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Anand, V. Susila, C. Kavitha et C. V. Subbarao. « Effect of Cavity Design on the Strength of Direct Posterior Composite Restorations : An Empirical and FEM Analysis ». International Journal of Dentistry 2011 (2011) : 1–6. http://dx.doi.org/10.1155/2011/214751.

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The aim of the present study was to verify the hypothesis that cavity design does not affect the strength of direct composite restorations as do material properties. Finite element modeling (FEM) and empirical testing were done for two cavity designs: a box shape (cube) and a concave shape (U). Two microhybrid composites were used to prepare the samples with the help of split stainless steel moulds. Compressive strength was tested. The results were statistically analyzed. Both FEA and empirical testing were complementary to each other in that the concave shape showed a significantly higher strength than box. Material properties affected the values only when box shape was used. The null hypothesis is thus rejected, and it is concluded that design significantly affects the strength of direct composite restorations.

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Fatehbasharzad, Parisa, Rachele Stefania, Carla Carrera, Ivan Hawala, Daniela Delli Castelli, Simona Baroni, Miriam Colombo, Davide Prosperi et Silvio Aime. « Relaxometric Studies of Gd-Chelate Conjugated on the Surface of Differently Shaped Gold Nanoparticles ». Nanomaterials 10, n^o 6 (5 juin 2020) : 1115. http://dx.doi.org/10.3390/nano10061115.

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Nowadays, magnetic resonance imaging (MRI) is one of the key, noninvasive modalities to detect and stage cancer which benefits from contrast agents (CA) to differentiate healthy from tumor tissue. An innovative class of MRI CAs is represented by Gd-loaded gold nanoparticles. The size, shape and chemical functionalization of Gd-loaded gold nanoparticles appear to affect the observed relaxation enhancement of water protons in their suspensions. The herein reported results shed more light on the determinants of the relaxation enhancement brought by Gd-loaded concave cube gold nanoparticles (CCGNPs). It has been found that, in the case of nanoparticles endowed with concave surfaces, the relaxivity is remarkably higher compared to the corresponding spherical (i.e., convex) gold nanoparticles (SPhGNPs). The main determinant for the observed relaxation enhancement is represented by the occurrence of a large contribution from second sphere water molecules which can be exploited in the design of high-efficiency MRI CA.

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Thèses sur le sujet "Concave cube"

FATEHBASHARZAD, PARISA. « Functionalized Concave Cube Gold Nanoparticles as Dual probe for Magnetic Resonance Imaging and Surface Enhanced Raman Scattering ». Doctoral thesis, Università degli Studi di Milano-Bicocca, 2020. http://hdl.handle.net/10281/273768.

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An innovative class of MRI CAs is represented by Gd-loaded gold nanoparticles. Differently from other nano-sized systems, the size, shape and chemical functionalization appear to affect the observed relaxation enhancement of water protons in their suspensions. The herein reported results shed more light on the determinants of the relaxation enhancement brought by Gd-loaded concave cube gold nanoparticles. It has been found that the role of the concave surface of these nanoparticles in the relaxivity is remarkable and it provides high contribution of second sphere water molecules. The specific shape of concave cube nanoparticles increases the relaxivity from 20.9 mM-1S-1 for spherical nanoparticles to 36.3 mM-1S-1. On the other hand, our studies prove that this special shape gold nanoparticles show high efficiency as a SERS probe. In the single-particle surface-enhanced Raman spectroscopy, the use of tunable plasmonic nanoparticles, having tipped surface structures, as being substrates revealed a highly feasible and promising approach to optimize SERS-based imaging and sensing applications. The concave cubic morphology has shown a remarkable plasmonic response, representing high sensitivity to the concavity degree. hence they can provide strong Raman signal which can be use in Raman imaging. Magnetic resonance and optical imaging are complementary techniques. By applying same nanoparticles as a contrast agent for both methods simultaniusly, screening total body with very clear identification become possible. This progress in imaging technologies associated with the advance of nanotechnology makes feasible the cancer detection and localization in its early stage.
An innovative class of MRI CAs is represented by Gd-loaded gold nanoparticles. Differently from other nano-sized systems, the size, shape and chemical functionalization appear to affect the observed relaxation enhancement of water protons in their suspensions. The herein reported results shed more light on the determinants of the relaxation enhancement brought by Gd-loaded concave cube gold nanoparticles. It has been found that the role of the concave surface of these nanoparticles in the relaxivity is remarkable and it provides high contribution of second sphere water molecules. The specific shape of concave cube nanoparticles increases the relaxivity from 20.9 mM-1S-1 for spherical nanoparticles to 36.3 mM-1S-1. On the other hand, our studies prove that this special shape gold nanoparticles show high efficiency as a SERS probe. In the single-particle surface-enhanced Raman spectroscopy, the use of tunable plasmonic nanoparticles, having tipped surface structures, as being substrates revealed a highly feasible and promising approach to optimize SERS-based imaging and sensing applications. The concave cubic morphology has shown a remarkable plasmonic response, representing high sensitivity to the concavity degree. hence they can provide strong Raman signal which can be use in Raman imaging. Magnetic resonance and optical imaging are complementary techniques. By applying same nanoparticles as a contrast agent for both methods simultaniusly, screening total body with very clear identification become possible. This progress in imaging technologies associated with the advance of nanotechnology makes feasible the cancer detection and localization in its early stage.

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Pérez, Valencia Felipe. « L'Église catholique cubaine, entre réforme politique et réforme ecclésiale : la réception du concile Vatican II à Cuba (1963 - 1998) ». Doctoral thesis, Université Laval, 2018. http://hdl.handle.net/20.500.11794/29622.

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Livres sur le sujet "Concave cube"

Cuba : A concise history for travellers. Toronto : Penguin Books, 2002.

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A, Welch David, dir. The Cuban Missile Crisis : A concise history. New York : Oxford University Press, 2007.

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V, Bean J., et Robb Sarah L, dir. Robb's family physician : Being a concise and comprehensive treatise on diseases, as they occur in every-day life, showing the causes, explaining the symptoms and treatment, and demonstrating the cure of the various ills humanity is subject to. 7^e éd. Paris, Ont : J.S. Brown, 1985.

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Levine, Robert. Concise History of Cuba. University of Cambridge ESOL Examinations, 2004.

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Levine, Robert. Concise History of Cuba. University of Cambridge ESOL Examinations, 2004.

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Cuba : A Concise History for Travellers. Bluefield Books, 1998.

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Shiling, Julio M. Democratization in Cuba : A Concise Manual. Patria de Marti, 2016.

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Melton, Trent. Rubik's Cube Solution Manual : A Concise Picture Step by Step Guide on How to Solve the Rubik's Cube. Independently Published, 2019.

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Ainsley, Robert. No More Panic Attacks : The Concise Guide to Cure Panic Attacks and Severe Anxiety. Independently Published, 2017.

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Munton, Don, et David A. Welch. The Cuban Missile Crisis : A Concise History. Oxford University Press, USA, 2006.

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Chapitres de livres sur le sujet "Concave cube"

Brahmi, Hanen, Tarek Hamrouni, Riadh Ben Messaoud et Sadok Ben Yahia. « A New Concise and Exact Representation of Data Cubes ». Dans Advances in Knowledge Discovery and Management, 27–48. Berlin, Heidelberg : Springer Berlin Heidelberg, 2012. http://dx.doi.org/10.1007/978-3-642-25838-1_2.

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Swift, John. « Cuba — Castro’s Revolution and the Bay of Pigs ». Dans The Palgrave Concise Historical Atlas of the Cold War, 48–49. London : Palgrave Macmillan UK, 2003. http://dx.doi.org/10.1057/9780230001183_22.

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Lazo, Orlando Luis Pardo. « No Blogger, No Cry ». Dans Digital Humanities in Latin America, 194–204. University Press of Florida, 2020. http://dx.doi.org/10.5744/florida/9781683401476.003.0012.

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The chapter is a concise creative essay by one of the protagonists of Cuban alternative blogging movement and emerging civil society. Younger generations in Cuba want to have their voices heard worldwide, despite the official censorship of the Castro government and the repression of the State Security. Freedom of expression as well as fundamental freedoms are still under attack in Cuba today, the once-called Island of Utopia by many international intellectuals, academics, and all sorts of political pilgrims mainly from the Left. Therefore, it is very important to know the insights of this peaceful struggle of the Cuban people for a more inclusive and democratic country, beyond the historic monopoly of the Communist Party. It is also important to understand why solidarity from abroad is necessary for these 21st-century freedom fighters not to succumb in isolation under the physical oppression but also under the misleading narrative of the Cuban Revolution seen as resistance to U.S. Imperialism and global capitalism. This creative essay playfully displays an initial map useful both for Cuban studies experts as well as for the common tourist.

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D'Agostino, Susan. « Go outside your realm of experience, on a hypercube ». Dans How to Free Your Inner Mathematician, 259–64. Oxford University Press, 2020. http://dx.doi.org/10.1093/oso/9780198843597.003.0044.

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“Go outside your realm of experience, on a hypercube” explains how and why mathematicians conceive of cubes in many dimensions, including a four-dimensional hypercube. Einstein’s special theory of relativity and the mathematics of string theory—a subfield of physics that seeks to understand the structure of the universe—both require more than the three dimensions with which we are familiar. The discussion, which focuses on how to make a four-dimensional hypercube, is enhanced with numerous hand-drawn sketches. Mathematics students and enthusiasts are encouraged to go outside their realm of experience in both mathematical and life pursuits. At the chapter’s end, readers may check their understanding by working on a problem. A solution is provided.

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Actes de conférences sur le sujet "Concave cube"

Teertstra, Peter M., M. Michael Yovanovich et J. Richard Culham. « Models and Experiments for Laminar Natural Convection From Heated Bodies in Enclosures ». Dans ASME 2004 Heat Transfer/Fluids Engineering Summer Conference. ASMEDC, 2004. http://dx.doi.org/10.1115/ht-fed2004-56633.

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A combined experimental and analytical study of natural convection heat transfer in the enclosure formed between a convex shaped, isothermal heated body and its concave shaped, surrounding isothermal enclosure is presented. An experimental test program is conducted at atmospheric and reduced pressure conditions using a transient measurement technique for various enclosure configurations, including concentric cubes, cube-in-sphere, sphere-in-cube, and other geometries. Measurements are reported for a wide range of Rayleigh number, including the diffusive limit. An analytical modeling procedure is developed based on a composite solution of three asymptotic relationships, the conduction limit, the laminar boundary layer and transition flow convective limits. The composite model is in excellent agreement with the data, with an average RMS difference of 2–7% for all enclosure configurations and test conditions.

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Gattas, Joseph M., et Yan Chen. « Synthesis of Folded Frame Structures From Cube-Type and Eggbox-Type Kirigami Geometry ». Dans ASME 2015 International Design Engineering Technical Conferences and Computers and Information in Engineering Conference. American Society of Mechanical Engineers, 2015. http://dx.doi.org/10.1115/detc2015-46433.

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Rigid-foldable cube-type and eggbox-type kirigami geometries have been of interest for applications including folded-core sandwich panels and deployable structures. Recent studies of these geometry families noticed that their convex pattern vertices enabled several further potential applications that were not otherwise possible with the concave vertices of more common pattern families such as Miura-type patterns. The following paper investigates one such application: the synthesis of folded frame structures from kirigami pattern geometric parametrisations. A new synthesis method is proposed for two geometries: a two-way orthogonal lattice frame generated from a kirigami cube pattern; and a multi-layer octahedral frame generated from a non-developable eggbox pattern. Both frames are developed with initial translation of folded geometries to frame element centre-lines and subsequent generation of integral frame elements with pattern sub-folds. Simple prototypes are manufactured to validate the synthesis method and it is found that the cube-generated frame compares favourable with typical frames with respect to packaging efficiency.

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