Proceedings 2018, 2, 194; doi:10.3390/proceedings2010194 www.mdpi.com/journal/proceedings Editorial Introduction–Symmetry 2017 † Iver Brevik 1 and Kimball Milton 2, * 1 Norwegian University of Science and Technology, N-7491 Trondheim, Norway; iver.h.brevik@ntnu.no 2 H.L. Dodge Department of Physics and Astronomy, University of Oklahoma, Norman, OK 73019, USA * Correspondence: kmilton@ou.edu; Tel.: +1-405-325-7060 † Presented at Symmetry 2017—The First International Conference on Symmetry, Barcelona, Spain, 16–18 October 2017. Published: 24 January 2018 Symmetry undergirds all of science. In fact, at the deepest level, the laws of nature are reflections of symmetry. The concept of energy, which may be the most important scientific construct, is a reflection of the symmetry that our fundamental description of nature is independent of time. Likewise, momentum conservation reflects the fact that observations made at different places, at different positions, yield the same laws of nature. Symmetry 2017, the First International Conference on Symmetry, brought together many experts in different fields of science, biology, physics, chemistry, mathematics, and computer science, to explore the pervasive nature of symmetry in understanding natural phenomena. In biology, it is often symmetry in its most transparent geometric aspect that plays a key role. Thus the symmetry of viruses and amino acids are crucial to understanding how living systems function. But symmetries beyond geometrical are clearly becoming more central as our understanding of biological systems matures. Physics has long been founded on the notions of symmetry. Sometimes, these are quite subtle, such as the dual symmetry between electric and magnetic charges. The central role of space-time symmetries, such as Lorentz invariance, cannot be overemphasized. Noether’s theorem codifies the duality between symmetries and conservation laws, already referred to above. It is remarkable, given the long history of the subject, that the form of the energy-momentum tensor in electromagnetism, which expresses the symmetry under general coordinate transformations, is still unsettled. Symmetry plays a key role in all scales of physics, from cosmology through condensed-matter physics, all the way down to subnuclear and particle physics. Chemistry likewise largely rests on symmetry. For example, chirality—handedness—is critical in the biological functioning of complex molecules. At the atomic and molecular level, where ab initio calculations are often intractable, symmetry arguments often allow for crucial simplifications. Mathematics seems to be nothing but symmetry. Lie groups lie at the basis of our understanding of the world. Symmetries are often not obvious, and emerge only after a problem has been studied for some time. And when we turn to numerical simulation of systems with high-performance computers, we would still be at a loss were it not for symmetries that permit drastic reduction of the number of independent variables. Lattice gauge theory is an obvious example, where great progress has been slowly won with the help of symmetry arguments.
Con Espumas, Sloterdijk ha completado su ensayo, en tres partes, de una nueva narración de la historia de la humanidad. El concepto antropológico de esfera remite a la tesis fundamental del autor, según la cual la vida es un asunto de forma. Sugiere que «vivir, configurar esferas y pensar son expresiones diferentes para lo mismo». El primer volumen, Burbujas, reconstruía cómo por la coexistencia de seres humanos con seres humanos se produce un interior de tipo especial. El acento se ponía entonces en la tesis de que la pareja representa, frente al individuo, la magnitud más auténtica y real. En la novela filosófica Globos, segundo volumen de la serie, se narraba de qué forma el pensamiento metafísico clásico, como contemplación del todo redondo, se propaga por el mundo, el globo, y pone en marcha formas diversas de globalización. Espumas ofrece ahora una teoría filosófica de la época actual en la que se destaca que la vida se desarrolla multifocalmente. La imagen alegre de la espuma sirve para recuperar el pluralismo de las invenciones del mundo y para formular una interpretación antropológico-filosófica del individualismo moderno que va más allá de las descripciones existentes. Con ello Espumas responde a la pregunta de cuál es la naturaleza del vínculo que reúne a los individuos, formando lo que la tradición sociológica llama «sociedad». Por su dedicación a las cuestiones más apremiantes de la actualidad, es posible leer el tercer volumen de Esferas como si se tratara del primero. Y, en cierto sentido, lo es.
An assumption and an acknowledgment by the author: In this article, the author shares with the readers the lessons that he has learned from the time he began writing articles. He hopes that the insights arising from writing may offer an impetus to the readers to contribute write-ups to magazines, journals, and newspapers both online and print. The author acknowledges that English is his second language; his intelligent quotient is average; and he is a slow learner contrary to the way he has been perceived by colleagues throughout his academic and seminary studies. His is like the life of a tortoise’s described in “The story of A Hare and A Tortoise’ <Completing Story: Slow and Steady Wins the Race / The Hare and the Tortoise (hscxm.com)>
Self-compacting concrete (SCC) is a very fluid concrete and a homogeneous mixture that solves most of the problems related to ordinary concrete. Self-Compacting Concrete gets dense and compacted due to its own self-weight. An experimental investigation has been carried out to determine different characters like workability and strength of Self-Compacting Concrete (SCC).Self-Compacted Concrete is generally defined as the “Concrete, which does not need Compaction.†It means SCC gets compacted without external efforts like vibration, tamping etc. Due to these characteristics, SCC is ideally suited for concreting structures, which have heavily congested reinforcement or difficult access conditions. In this project, M30 grade concrete were made. 25%, 50% and 75% percentage of river sand where replaced by M-sand. The compressive strength, split tension test and flexural strength of concrete obtained at the ages of 7 and 28 days
India is proud of its long-standing contributions to the UN peace operations (UNPOs) with a humane approach. India's involvement in UNPOs commenced with the UN-mandated Neutral Nations’ Repatriation Commission (NNRC) in Korea in 1953 and has grown to more than 280,000 troops by June 2024, deploying in more than 49 UN missions out of 73. As many as 178 Indian peacekeepers have made the supreme sacrifice while serving in these missions. Indian diplomats, soldiers from the armed forces, police personnel and civilian peacekeepers have taken part in some of the most complex and intractable operations spanning the four continents. The ancient Indian wisdom of “Vasudhaiva Kutumbakam” or “world as one family”, echoes in these endeavours, with its time-tested ethos of openness, respect for diversity, coexistence, and cooperation.
Colloque international Nature et Ville regards croisés franco-lusophones
Université de Tours
Quartier des 2 Lions, Tours
Colloque organisé par l’UMR CITERES, CNRS - Université de Tours
We have developed a high-level and flexible framework for supporting the construction of multiuser interfaces. The framework is based on a generalized editing interaction model, which allows users to view programs as active data that can be concurrently edited by multiple users. It consists of several novel components including a refinement of both the Seeheim UIMS architecture and the distributed graphics architecture that explicitly addresses multiuser interaction; the abstractions of shared active variables and interaction variables, which allow users and applications to exchange information; a set of default collaboration rules designed to keep the collaboration-awareness low in multiuser programs; and a small but powerful set of primitives for overriding these rules. The framework allows users to be dynamically added and removed from a multiuser sesssion, different users to use different user interfaces to interact with an application, the modules interacting with a particular ...
To assess musculoskeletal ultrasonographic (US) findings in patients with type 2 diabetes mellitus (DM) with and without pes anserinus (PA) tendinitis or bursitis syndrome; and to determine possible etiologic factors such as systemic diabetic microvascular disease complications in these patients. The knee joints were examined with an ultrasound real-time scanner using a 10 MHz electronic linear transducer in 48 patients with type 2 DM and 25 controls. The presence of systemic diabetic microvascular disease complications was evaluated. On examination 23 (23.9%) knees of the 14 (29.1%) patients with type 2 DM were found to have PA tendinitis or bursitis syndrome. US revealed that only 4 (8.3%) of the diabetic patients with PA tendinitis or bursitis syndrome had PA tendonitis findings. There were no significant differences in the thickness of PA tendons between the diabetic patients with bilateral knee PA tendinitis or bursitis syndrome (9 patients) and controls, or between the asympto...
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