Search results for "Design"
showing 10 items of 5885 documents
Adaptive BEM for Low Noise Propeller Design
2009
A potential-based Boundary Element Method is presented for the aerodynamic and acoustic design of propel- lers at on- and off-design point conditions. Using an adaptive method, a family of airfoil sections is selected to produce the required performance (thrust, torque and efficiency versus advance ratio) at different cruise flight levels. Climb condi- tions are also considered in order to check the off-design point performance. Once the available airfoil data have been stored in a database, the code processes the families of airfoils to generate a complete geometry for a propeller of the specified performance with an optimized noise emission. The computational scheme adjusts the blade geom…
The performance of thin-film Li-ion batteries under flexural deflection
2006
A method is introduced to study the effects of flexural deformation on the electrical performance of thin-film lithium-ion batteries. Flexural deformation of thin films is of interest to engineers for applications that can be effective in conformal spaces in conjunction with multi-functional composite laminates in structural members under mechanical deflections such as thin airfoils used in unmanned aerial vehicles (UAVs). A test fixture was designed and built using rapid prototyping techniques. A baseline reference charge/discharge cycle was initially obtained with the device in its un-flexed state, in order to later contrast the performance of the thin-film battery when subjected to defle…
Shock control bump design optimization on natural laminar aerofoil
2011
The chapter investigates Shock Control Bumps (SCB) on a Natural Laminar Flow (NLF) aerofoil; RAE 5243 for Active Flow Control (AFC). A SCB approach is used to decelerate supersonic flow on the suction/pressure sides of transonic aerofoil that leads delaying shock occurrence or weakening of shock strength. Such an AFC technique reduces significantly the total drag at transonic speeds. This chapter considers the SCB shape design optimisation at two boundary layer transition positions (0 and 45%) using an Euler software coupled with viscous boundary layer effects and robust Evolutionary Algorithms (EAs). The optimisation method is based on a canonical Evolution Strategy (ES) algorithm and inco…
Aminoacid zwitterions in solution : Geometric, energetic, and vibrational analysis using density functional theory-continuum model calculations
1998
Glycine and alanine aminoacids chemistry in solution is explored using a hybrid three parameters density functional (B3PW91) together with a continuum model. Geometries, energies, and vibrational spectra of glycine and alanine zwitterions are studied at the B3PW91/6-31+G∗∗ level and the results compared with those obtained at the HF and MP2/6-31+G∗∗ levels. Solvents effects are incorporated by means of an ellipsoidal cavity model with a multipolar expansion (up to sixth order) of the solute’s electrostatic potential. Our results confirm the validity of the B3PW91 functional for studying aminoacid chemistry in solution. Taking into account the more favorable scaling behavior of density funct…
Alchimia e Memphis. I colori progettati del design
2012
Il design italiano, tra anni Settanta e Ottanta, viene marchiato a fuoco dalla definizione “Made in Italy” che ne riporta provenienza geografica, qualità progettuale e innovativa ed eccellenza assoluta. In tale scenario, all’interno di tante realtà legate al design e diffuse capillarmente sul territorio, si continua a sperimentare in modo ininterrotto, e in ogni settore legato alla progettazione, alla produzione, alla ricerca tecnologica e dei nuovi materiali. Scenario nel quale si muovono anche le realtà di Alchimia e Memphis che ripensano il progetto, attribuiscono nuovo valore a elementi come il colore e la decorazione, costruiscono nuovi lessici. In the 1970s and 1980s, the identity of …
Alessandro Costariol. 永远的视觉设计师 / Alessandro Costariol. Remote future visual designer
2010
永远的视觉设计师 如果用一个词来简洁鲜明的概括一个人的话，我认 为永恒一词是最佳选择。这个词是个近代词汇， 始创于20世纪，表达出一种时代特性。在逻辑学 和语言学领域重复出现。它标志着客体和时间连 续性的中断。并赋予客体以特权， 跨越时间的限 制，忽略时间发展的顺序和速度，使客体处于一种 独立的暂停状态。永恒所表达的含义如同一个现代 人穿了一件古时的衣服，这种古时和现代的不同风 格常常冲突不断，就像一道糖醋口味的菜肴中，一 个口味偏咸的人却意外的品尝到了甜味。 If you could define a person with only one term, to have a concise, sharp and lapidary picture of him, then I think the word I'd choose to refer to Alessandro Costariol, is timeless. This is a rather recent term, coined in the twentieth century, expression of contemporaneity, recurrent in the philosophical and linguistic fields, which marks a break in continuity between object and time, giving the first a privileged status that allows it to cross the second, ign…
Additivity of affine designs
2020
We show that any affine block design $$\mathcal{D}=(\mathcal{P},\mathcal{B})$$ is a subset of a suitable commutative group $${\mathfrak {G}}_\mathcal{D},$$ with the property that a k-subset of $$\mathcal{P}$$ is a block of $$\mathcal{D}$$ if and only if its k elements sum up to zero. As a consequence, the group of automorphisms of any affine design $$\mathcal{D}$$ is the group of automorphisms of $${\mathfrak {G}}_\mathcal{D}$$ that leave $$\mathcal P$$ invariant. Whenever k is a prime p, $${\mathfrak {G}}_\mathcal{D}$$ is an elementary abelian p-group.
Relative principal congruences in congruence-modular quasivarieties
1998
The problem of definability of relative principal congruences in relatively congruence modular (RCM) quasivarieties is investigated. The RCM quasivarieties are characterized in terms of parameterized families of finite sets of pairs of terms which define relative principal congruences.