This work describes the high-velocity impact behavior of doubly curved sandwich panels. The panels are manufactured using carbon/fiber epoxy composite face sheets, polyurethane foam core and 3D-printed PLA plastic cellular auxetic (re-entrant) honeycombs. High-velocity tests carried out by a single-stage air gas gun test machine. A spherical steel projectile with radius 5 mm is impacted to cent...

In this paper energy bands and Berry curvature of graphene was studied. Desired Hamiltonian regarding the next-nearest neighbors obtained by tight binding model. By using the second quantization approach, the transformation matrix is calculated and the Hamiltonian of system is diagonalized. With this Hamiltonian, the band structure and wave function can be calculated. By using calculated wave f...

Pseudomonas cepacia strains were isolated from the water reservoirs of unheated nebulizers in a hospital setting. The isolates were characterized by morphology, biochemical tests, and antibiotic susceptibility patterns. An interesting feature of these organisms was their capacity for sustained multiplication in either doubly deionized or doubly distilled water as well as 5% dextrose or 0.9% sal...

We present new understanding of excitonic fine structure in close-to-symmetric InAs/GaAs and InGaAs/GaAs quantum dots. We demonstrate excellent agreement between spectroscopy and many-body pseudopotential theory in the energy splittings, selection rules and polarizations of the optical emissions from doubly charged excitons. We discover a marked difference between the fine structure of the doub...

Mendelsohn and Liang, in J. Combin. Des. 11 (2003), introduced a new class of difference sets and designs: (v, k, [λ1, λ2, . . . , λm])-difference sets and (v, k, [λ1, λ2, . . . , λm])-designs, and mainly discussed designs with a relationship called λ-equivalence. In this paper, we introduce the concepts of a doubly equivalent design as well as a super class. We describe the structure of super ...

The competition graph of a doubly partial order is known to be an interval graph. The competition-common enemy graph of a doubly partial order is also known to be an interval graph unless it contains a cycle of length 4 as an induced subgraph. In this paper, we show that the niche graph of a doubly partial order is not necessarily an interval graph. In fact, we prove that, for each n ≥ 4, there...

PURPOSE To develop and test a method for automatically calculating the in-plane rotation for doubly-oblique slice geometry in order to minimize wrap artifacts for a given FOV. MATERIALS AND METHODS The equations for in-plane rotation were formulated for doubly-oblique imaging of a cylindrical body with elliptical cross-section. Based on this formulation, automatic in-plane rotation was implem...

We give a classification of all double circulant doubly even self-dual [72, 36, 12] codes. We also demonstrate that every double circulant doubly even self-dual [72, 36, 12] code has no extremal doubly even self-dual [72, 36, 16] neighbor.

Quantifiers like “all” and “every” are frequent in daily language. However, when a sentence contains two quantifiers or is “doubly-quantified” (e.g., “Every boy ate a cookie”) the meaning can often be ambiguous since there are two potential interpretations: collective (e.g., several boys sharing a single cookie) and distributive (e.g., several boys each eating their own cookie). Psycholinguisti...