Most polymeric tribological components are inherently insulative, resulting in susceptibility to failure from frictional heating at the PV limit, which is typically reported as a product of the heat flux terms pressure (P) and sliding speed (V). This letter reports on the design of a tribological composite for increased thermal conductivity and PV limit. The control sample is an unfilled compos...

In Thailand, ceramic jars (135-200 liters) covered by aluminum lids commonly are used to store water for household use. In laboratory cages, gravid female Aedes aegypti (L.) were able to enter and oviposit in a covered water jar. Although the aluminum lid was not a complete barrier to gravid females, it reduced the number of eggs oviposited by 77%. A vertically oriented foam rubber ring which w...

A novel three-dimensional (3D) metal/metal oxide core/branch array electrode has been fabricated as a supercapacitor electrode. Hollow Ni nanocorn arrays are constructed on Ni foams and act as a highly conductive and stable support to Co3O4 nanoflakes. Enhanced pseudocapacitive performance compared to bare Co3O4 nanosheets is demonstrated with high rate capability and excellent cycling stability.

Three stochastic open-cell aluminum foam samples were incrementally compressed and imaged using X-ray Computed Tomography (CT). One of the samples was created using conventional investment casting methods and the other two were replicas of the same foam that were made using laser powder bed fusion. The reconstructed CT data were then examined in Paraview to identify and highlight the types of f...

Low density metallic foams of consistent controlled morphology offer improved unique material and mechanical properties, yet they have eluded traditional metallurgical engineering methods. A new method to produce metallic foam through a thermo-plastic expansion process has been discovered and characterized with microtomography. The new foaming process enables porosities unachievable through tra...

In this paper, the free vibration analyses of aluminum-foam sandwich structures were completed numerically. Foam and aluminum (Al) used for core surface layers structure, respectively. addition, an adhesive was as a thin film. Natural frequencies mode shapes structure obtained different thickness materials. For this, three structures, with same thickness, modeled SS1, SS2 SS3. Analyses performe...

Strain gradient theory is an accurate model for capturing the size effect and localization phenomena. However, challenge in identification of corresponding constitutive parameters limits practical application theory. We present utilize asymptotic homogenization herein. All rank four, five, six tensors are determined with demonstrated computational approach. Examples epoxy carbon fiber composite...

abstract background and purpose:the rapid urbanization and industrialization in many parts of the world have led to the accumulation of heavy metals in the terrestrial environment and pose a serious threat to human health. in this study, a broad assessment was conducted to estimate the levels of heavy metals in groundwater in sistan and baluchestan via geographic information system (gis), iran,...