Availability of different rooms in houses.

<p>Availability of different rooms in houses.</p

Some user attitudes regarding gas burning cooking appliances.

<p>Some user attitudes regarding gas burning cooking appliances.</p

The answers of housewives to the question that what can be the most important cause of burn injuries while cooking on stove.

<p>The answers of housewives to the question that what can be the most important cause of burn injuries while cooking on stove.</p

The answers of housewives to the question that what can be the most important cause of burn injuries while cooking on stove.

<p>The answers of housewives to the question that what can be the most important cause of burn injuries while cooking on stove.</p

The sampling flow diagram.

<p>The sampling flow diagram.</p

Frequency of use of different types of cooking appliances.

<p>Frequency of use of different types of cooking appliances.</p

Extrinsic Hardening of Superhard Tungsten Tetraboride Alloys with Group 4 Transition Metals

Alloys of tungsten tetraboride (WB₄) with the group 4 transition metals, titanium (Ti), zirconium (Zr), and hafnium (Hf), of different concentrations (0–50 at. % on a metals basis) were synthesized by arc-melting in order to study their mechanical properties. The phase composition and purity of the as-synthesized samples were confirmed using powder X-ray diffraction (PXRD) and energy dispersive X-ray spectroscopy (EDS). The solubility limit as determined by PXRD is 20 at. % for Ti, 10 at. % for Zr, and 8 at. % for Hf. Vickers indentation measurements of WB₄ alloys with 8 at. % Ti, 8 at. % Zr, and 6 at. % Hf gave hardness values, <i>H</i>_v, of 50.9 ± 2.2, 55.9 ± 2.7 and 51.6 ± 2.8 GPa, respectively, compared to 43.3 GPa for pure WB₄ under an applied load of 0.49 N. Each of the aforementioned compositions are considered superhard (<i>H</i>_v > 40 GPa), likely due to extrinsic hardening that plays a key role in these superhard metal borides. Furthermore, these materials exhibit a significantly reduced indentation size effect, which can be seen in the plateauing hardness values for the W_1–<i>x</i>Zr_<i>x</i>B₄ alloy. In addition, W_0.92Zr_0.08B₄, a product of spinoidal decomposition, possesses nanostructured grains and enhanced grain hardening. The hardness of W_0.92Zr_0.08B₄ is 34.7 ± 0.65 GPa under an applied load of 4.9 N, the highest value obtained for any superhard metal at this relatively high loading. In addition, the WB₄ alloys with Ti, Zr, and Hf showed a substantially increased oxidation resistance up to ∼460 °C, ∼510 °C, and ∼490 °C, respectively, compared to ∼400 °C for pure WB₄

Near Field of Strongly Coupled Plasmons: Uncovering Dark Modes

Strongly coupled plasmons in a system of individual gold nanoparticles placed at subnanometer distance to a gold film (nanoparticle-on-plane, NPOP) are investigated using two complementary single particle spectroscopy techniques. Optical scattering spectroscopy exclusively detects plasmon modes that couple to the far field via their dipole moment (bright modes). By using photoemission electron microscopy (PEEM), we detect in the identical NPOPs near-field modes that do not couple to the scattered far field (dark modes) and are characterized by a strongly enhanced nonlinear electron emission process. To our knowledge, this is the first time that both far- and near-field spectroscopy are carried out for identical individual nanostructures interacting via a subnanometer gap. Strongly resonant electron emission occurs at excitation wavelengths far off-resonant in the scattering spectra

Univariate analysis of the child and caregiver variables.

<p>Univariate analysis of the child and caregiver variables.</p

Summary of CFA fit statistics.

<p>Summary of CFA fit statistics.</p