Improving of processing technology of blanks for heavy trucks brackets by laser cutting

The possibility for using of laser cutting systems for the production of blanks for brackets parts for heavy trucks is considered. The use of laser cutting aggregates makes it possible to exclude the cutting of blanks in the form of cards, to exclude the operations of cold stamping of parts 10 and 12 mm thickness, to cut metal along any complex contour with accuracy of 0.1 mm and high-quality cutting line without subsequent mechanical processing. Rational technological schemes are developed for the production of brackets for heavy trucks by laser cutting of blanks for brackets parts.

A FEAST Algorithm for the Linear Response Eigenvalue Problem

In the linear response eigenvalue problem arising from quantum chemistry and physics, one needs to compute several positive eigenvalues together with the corresponding eigenvectors. For such a task, in this paper, we present a FEAST algorithm based on complex contour integration for the linear response eigenvalue problem. By simply dividing the spectrum into a collection of disjoint regions, the algorithm is able to parallelize the process of solving the linear response eigenvalue problem. The associated convergence results are established to reveal the accuracy of the approximated eigenspace. Numerical examples are presented to demonstrate the effectiveness of our proposed algorithm.

Accurate Stiffness Modeling Method for Flexure Hinges with a Complex Contour Curve

The transfer matrix of a flexure hinge was derived on the basis of balance equations and the virtual work principle with consideration of axial, shear, and bending deformations. The element stiffness matrix of a flexure hinge was obtained from the relationship between the transfer and stiffness matrices. In this manner, the unified formula of element stiffness of a general flexure hinge was established. By using this method, rigidity models of parabolic, corner-filled, and the right circular flexure hinge have been deduced. By taking the right circular flexure hinge as an example, the result obtained using this method were compared with those of methods provided in other studies and the finite element results. The comparison results revealed that the proposed method increases the rigidity accuracy because the effect of the uneven distribution coefficient of shear stress was considered. The stiffness error was within 10%, which demonstrates the validity of this method. In contrast to the other methods, the proposed method can be applied by determining the first integral element stiffness of a common flexible hinge. Moreover, the proposed method provides better commonality, flexibility, and ease of programming. In particular, it is much easier for the flexure hinges with a complex contour curve. Transitivity can be used to calculate the rigidity after the flexure hinge has been divided into subunits, thus making it unnecessary to convert to the global coordinate system.

A shear-thinning adhesive hydrogel reinforced by photo-initiated crosslinking as a fit-to-shape tissue sealant

A fit-to-shape sealant enhanced by photo-initiated crosslinking treated a wound with a nonplanar complex contour rapidly and effectively.

Optimizing the lay-up of composite tapes based on improved geodesic strategy for automated tape placement

The use of composite materials in aerospace, automotive and ship industry allows manufacturing lighter and more efficient mechanical structures. The major limiting factors are the high-manufacturing costs and low-production rates. Automated tape placement is one alternative process to overcome the limiting factors. Due to the complex contour of the mandrel, the lay-up paths of the contiguous tapes are not parallel along their lengths, which eventually introduce gaps or overlaps between the edges of tapes. Overlaps and excessive gaps are undesirable as they will decrease the strength of the resulting composite member. In this paper, a novel trajectory planning method for automated tape placement, entitled improved geodesic strategy, is proposed. The strategy aims to optimize the relationship between adjacent tapes. At the same time, the distortion of composite tape is also specified in order to prevent wrinkling. The principle and characteristic of the algorithm are presented. The method is investigated on the airfoil of an unmanned aerial vehicle and some of the results are presented in this paper.

Looking into Segments

This paper outlines Q theory, in which the traditional segment (consonant, vowel) is decomposed into a string of three ordered subsegments, or q, representing the onset, target, and offset of the segment. The postulation of subsegmental structure permits the representation of complex (contour) segments as well as subtle contrasts in segment-internal changes of state. Q Theory synthesizes insights from Autosegmental Phonology, Aperture Theory, and Articulatory Phonology in a representation that standard phonological constraints can refer to. Q theory is supported by arguments that subsegments act independently and need to be independently referenced by the phonological grammar. Embedded into Agreement by Correspondence Theory, Q theory permits the analysis of contour assimilation as well as contour formation, both in the tonal and segmental domains.

Spontaneous speech intonation in (European) Portuguese: an example of experimental analysis with a macrosyntactic view

Besides studies based on illocution criteria (Raso Mello, 2009), most studies on Portuguese intonation pertain mainly to read speech, and use for a large part either the autosegmental-metrical framework -- AM - (Frota al., 2007) or, for a small number, a phonosyntactic model (Martin, 1999, 2004). In papers pertaining to the last category, there is a clear assumption that the sentence prosodic structure is independent but associated to syntax. In this view, prosodic contours located on or around stressed syllables function as phonological markers of this prosodic structure. Experimental studies describe for example a high and rising melodic contour located on the first stressed syllable of a subject NP, and either a rising contour (on the stressed syllable) or a complex contour (falling on the stressed syllable and rising on the last syllable) of the last unit of a SN syntagm. Whereas this description is essentially compatible with those given in the AM framework, the validity of AM theory may be questionable if extended to non-prepared (spontaneous) speech. In such cases, a macrosyntactic approach proves to be an effective tool, as it envisions the sentence as a sequence of macrosegments, syntactically well formed in the classical sense, but whose relations of parataxis or dependency with each other are partially determined by the sentence prosodic structure. This paper presents a short example of analysis conducted in this framework, showing the interaction between macrosyntactic and prosodic structures, the latter operation (re)structuring the sequence of macrosegments organized (by definition) in a flat structure in the sentence.