Search results for " conica"
showing 9 items of 9 documents
Finite Element Method and Von Mises Investigation on Bone Response to Dynamic Stress with a Novel Conical Dental Implant Connection
2020
The bioengineering and medical and biomedical fields are ever closer, and they manage to obtain surprising results for the development of new devices. The field of simulations and studies in silica has undergone considerable development in recent years, favoring the advancement of medicine. In this manuscript, a study was carried out to evaluate the force distribution on the implant components (In-Kone® Universal) and on the peri-implant tissues subjected to loading. With the finite element analysis and the Von Mises method, it was possible to evaluate this distribution of forces both at 0 degrees (occlusal force) and at 30 degrees; the applied force was 800 N. The obtained results on this …
Nonlinear analysis of cylindrical and conical hysteretic whirl motions in rotor-dynamics
2014
Abstract The internal friction of a rotor–shaft-support system is mainly due to the shaft structural hysteresis and to some possible shrink-fit release of the assembly. The experimentation points out the destabilizing effect of the internal friction in the over-critical rotor running. Nevertheless, this detrimental influence may be efficiently counterbalanced by other external dissipative sources located in the supports or by a proper anisotropic configuration of the support stiffness. The present analysis considers a rotor–shaft system which is symmetric with respect to the mid-span and is constrained by viscous-flexible supports with different stiffness on two orthogonal planes. The cylin…
Damping of rotor conical whirl by asymmetric dry friction suspension
2009
Abstract A new technique for the rotor whirl damping in rotating machinery, based on the elastic suspension of the journal boxes and the use of dry friction surfaces normal to the shaft axis between their supports and the frame, is here analysed theoretically for several cases of rotor systems characterized by mass and constraint asymmetry, where gyroscopic effects are to be expected and conical whirl motions may grow up. The critical flexural speeds can be easily cut off by an adhesive state of the supports and the whirl amplitude can be minimized as well throughout the remaining sliding range. Confining the operative angular speed of the rotor in the range of adhesive contact between the …
Una localidad nueva para Orchis champagneuxii y Orchis conica en el norte de Alicante
2006
Se da a conocer una nueva localidad en la que conviven dos orquídeas muy raras en el ámbito de la provincia de Alicante, y que resultan también escasas en la Comunidad Valenciana: Orchis champagneuxii Barnéoud [≡ O. morio subsp. champagneuxii (Barnéoud) E.G. Camus] y O. conica Willd. [− O. lactea auct.]. En ambos casos sólo se tiene referencias previas de su presencia en escasas localidades de las comarcas del norte de Alicante, a menudo en áreas próximas a la provincia de Valencia. Para ambas se aportan datos sobre su ecología y estado de conservación, y asimismo se propone la creación de una microrreserva de flora que asegure su continuidad en las comarcas alicantinas. A new site is repor…
Dalla geometria proiettiva e descrittiva al linguaggio informatico. Procedimenti per la costruzione delle coniche.
2008
Lo studio si inserisce nell’ambito della ricerca di soluzioni ai problemi della rappresentazione grafica, esponendo considerazioni teoriche che consentono di eseguire procedimenti geometrico-descrittivi decodificati in linguaggio informatico, per implementare comandi CAD.
Aspetti storici delle curve relative ad un triangolo: dalla conica per 9 punti alla cubica per 21 punti
Fra le numerose tematiche legate alla cosiddetta “Geometria del triangolo”, di cui si occuparono nel corso dell’Ottocento eminenti matematici, sicuramente quella relativa alla conica dei nove punti è una delle più interessanti. Tale conica è la naturale generalizzazione del cerchio dei nove punti scoperto nel 1822 da Feuerbach. Nel 1844 Jacob Steiner in un articolo apparso in italiano in una piccola rivista romana, generalizza il cerchio di Feuerbach relativo ad un triangolo al concetto di conica dei nove punti, luogo dei centri del fascio di coniche per i tre vertici del triangolo e per un ulteriore punto interno o esterno al triangolo. Nel 1862 Eugenio Beltrami riguarda la conica dei nove…
New and less known Orthoptera (Insecta) from the island of Socotra (Yemen)
2009
A list of nine species of Orthoptera collected on Socotra is reported. Three of them were previously unrecorded on the island (Trigonidium cicindeloides, Paratettix subpustulatus and Acrotylus insubricus) and one (Ochrilidia socotrae n.sp.) was undescribed. Further systematic notes on Glomeremus pileatus, G. mediopictus, Pyrgomorpha conica tereticornis, Acrotylus incarnatus and Sphingonotus insularis are included. The East African Acrotylus meruensis, previously considered synonym of A. incarnatus, is proposed as a valid species, distinct from the latter.
Microbiological Characteristics of Wild Edible Mushrooms and Effect of Temperature during Storage of Morchella conica
2019
Background: The continuous worldwide increase of consumption of fresh mushrooms has registered in the recent years. The major goal of this study was to determine the microbiological characteristics of wild edible mushrooms and effect of temperature during storage of Morchella conica.
 Methods: Wild mushrooms of the species Boletus edulis, Cantharellus cibarius, and Leccinum aurantiacum were collected in a mixed forest of Picea abies, Betula pendula, and Pinus sylvestris located in Tartu territory, Estonia. Faecal indicators, potential pathogens, spoilage bacteria, and microfungi (yeasts and moulds) were evaluated. M. conica was microbiologically investigated for 24 days under different…
LA SCALA DI MOMO AI MUSEI VATICANI. Curve coniche gobbe e superfici rigate da esse generate.
2014
This study is part of a more vast research that aims to examine in depth the geometrical-spatial origin of skew curves belonging to conical surfaces of revolution: conical spiral and conical helix. The study begins with an investigation concerning the geometrical tracing, and the spatial origin of both the skew curves and the ruled surfaces they generate, carrying out a comparison of the different formal characteristics through a number of algorithms that control the reference properties, written within the renown Rhinoceros plug-in, Grasshopper. Then follows an in-depth analysis of an admirable example of architecture dating back to the first thirty years of the past century and made by th…