The polymer/ferroferric oxide (Fe3O4) foam and aerogel composites generally exhibit superior radar absorptivity performance. However, these have poor mechanical thermal properties. This study manufactured a polylactic acid (PLA)/Fe3O4 bio-composite evaluated the absorptivity, thermal, properties of radar-absorbing material. were prepared using solvent casting method to mix PLA Fe3O4 at varying ...

Radiative cooling is a promising solid-state, non-vapor-compression technology for passive refrigeration and air conditioning. Although this phenomenon occurs naturally, achieving significant amount of to make it technically economically viable requires highly engineered, spectrally selective radiative surfaces. These characteristics difficult estimate, particularly when integrated with other s...

It is shown that the superradiance modes always exist in the radiation by the (4 + n)-dimensional rotating black holes. Using a Bekenstein argument the condition for the superradiance modes is shown to be 0 < ω < mΩ for the scalar, electromagnetic and gravitational waves when the spacetime background has a single angular momentum parameter about an axis on the brane, where Ω is a rotational fre...

Methods presently used for the determi­ nation of serum iron and unsaturated ironbinding capacity have somewhat limited spectrophotometric sensitivity. Since molar absorptivity of a metal-ligand complex is a relative measure of sensitivity, an increase in the former improves accuracy in the de­ termination of trace constituents, especially when they are abnormally low. Obviously, low amounts of...

background: in general, measurements of solar ultraviolet (uv) radiation are related to horizontal surfaces. while the hu­mans walking and standing outdoors expose to the natural solar uv radiation, their eyes, cheeks, extremities, trunks, or many other anatomical sites are close to vertical plane and random orient to different directions. in this study, we character­ized the diurnal variations...

Abstract State-of-the-art climate models exhibit significant spread in the climatological value of atmospheric shortwave absorption (SWA). This study investigates both possible causes and climatic impacts this SWA intermodel spread. The global-mean largely originates from difference water vapor absorptivity. Hence, we alter absorptivity Community Earth System Model, version 1, with Atmosphere 4...

In the present work, a prototype of a new type of solar collectors, which called Direct Absorption Solar Collector, was built and its thermal performance is experimentally compared with conventional flat plate solar collector under transient and steady state conditions. Different volume fractions of multi wall carbon nanotubes in water and ethylene glycol mixture (70%:30% in volume) were used a...

Abstract Radiative cooling (RC) is natural phenomenon in which an object passively cools itself by highly radiating mid-infrared waves to the cold outer space. The delignified wood (DW), lignin molecules are removed from wood, shows promising performance of daytime radiative (DRC). However, DW usually hot-pressed during oven drying process results collapse cell walls. This problem hinders appli...

The presented study aims to clarify the implications of passive design measures on heating and cooling energy use single-family residential buildings under European representative climates. In order address this matter, different values thermal transmittance (opaque transparent), window floor ratio, distribution, shape factor, diurnal heat storage capacity, external opaque surface solar absorpt...