The 0 + states of 12 C are considered within the framework of the microscopic three-α-cluster model. The main attention is paid to accurate calculation of the width of the extremely narrow near-threshold 0 + 2 state which plays a key role in stellar nucleosynthesis. It is shown that the

Long-term moisture performance is a critical consideration for design and construction of building envelopes in energy-efficient buildings, yet field measurements of moisture characteristics for highly insulated wood-frame walls in mixed-humid climates are lacking. Temperature, relative humidity, and moisture content of wood framing and oriented strand board (OSB) structural panel sheathing were measured over a period from mid-November 2011 through March 2013 in both north-and south-facing orientations in test structures near Washington, DC, USA. Wall configurations varied in exterior cladding, water-resistive barrier, level of cavity insulation, presence of exterior continuous insulation, and interior vapor retarder. The combination of high interior humidity and high vapor permeance of painted gypsum board led to significant moisture accumulation in OSB sheathing during winter in walls without a vapor retarder. In contrast, wintertime moisture accumulation was not significant with an interior kraft vapor retarder. Extruded polystyrene exterior insulation had a predictable effect on wall cavity temperature but a marginal impact on OSB moisture content in walls with vinyl siding and interior kraft vapor retarder. Hygrothermal simulations approximately captured the timing of seasonal

Radiative and nonradiative decay of charge nonsymmetrical molecular ions 3,4 He 1,2 Hµ have been investigated. Decay rates in both channels and γ-ray spectra for the states of the total angular momentum L = 0, 1, 2 have been calculated using the hyperspherical "surface" functions method. Isotopic dependence of the decay rates is discussed. A comparison of the calculated γ-ray spectra with the recent experiments indicates the 3,4 Hedµ decay from the L = 1 state.

The relativistic four-quark equations are found in the framework of coupled-channel formalism. The dynamical mixing of the meson-meson states with the four-quark states is considered. The approximate solutions of these equations using the method based on the extraction of leading singularities of the amplitudes are obtained. The four-quark amplitudes of cryptoexotic mesons including the quarks of three flavours (u, d, s) and the charmed quark are constructed. The poles of these amplitudes determine the masses of tetraquarks. The mass values of low-lying tetraquarks are calculated.Comment: 21 pages, pdf, minor typos in the text correcte

Post-hurricane damage assessments have documented the failure of wall components and connections including the loss of various types of siding materials. In addition, recent U.S. model building/energy code changes are expected to lead to increased use of continuous insulation, particularly foam sheathing attached to the exterior surface of light-frame wall framing, to achieve advanced energy code compliance. A particular need for multi-layer wall systems is the understanding of wind loads on the various layers so that designers and product manufacturers can ensure acceptable building envelope performance of energy efficient wall systems in high-wind events, such as hurricanes. This paper presents results obtained from full-scale wind tunnel tests and compares them with results obtained using dynamic pressure chamber tests. The full-scale wind tunnel tests indicate that porous exterior siding experiences higher wind loads and that the interior gypsum wall board experiences lower loads than previously measured in dynamic pressure chamber tests. Results of the different test methods are compared and implications are discussed.