Solar energy, positioned as an eco-conscious substitute for conventional fossil fuels, holds great promise for meeting heating needs. For solar energy absorption and subsequent light-to-heat conversion, light-absorbing materials require broad-spectrum light absorption capabilities. Herein, we present the fabrication of broadband light-absorbing polypyrrole-carboxylated carbon nanotube membranes via a facile electrochemical oxidation route. By manipulating electrochemical deposition time, the structure of the membranes was tailored, resulting in enhanced absorption within the near-infrared spectrum to achieve over 98.95% light absorption across the entire solar spectrum. The membranes demonstrated exemplary thermal efficacy and insensitivity to incident angles in photothermal conversion, the membranes facilitated a notable 12 °C temperature elevation within a simulated greenhouse compared to ambient conditions. Thus, these membranes exhibit considerable potential for widespread application in photothermal conversion and greenhouse technology.
Conductive ferroelectric domain walls have been the focus of intensive studies in nanoelectronics due to their promising electronic properties. Here, both head-to-head and tail-to-tail domain walls with a large inclination angle (≈90°) were fabricated on the surface of x-cut nominally pure congruent lithium niobate crystals. Our results show that both types of domain walls are conductive, while the conductivity of the head-to-head domain walls is larger than that of the tail-to-tail domain walls by about two orders of magnitude at the same inclination angle of domain walls.
An entry from the Cambridge Structural Database, the world’s repository for small molecule crystal structures. The entry contains experimental data from a crystal diffraction study. The deposited dataset for this entry is freely available from the CCDC and typically includes 3D coordinates, cell parameters, space group, experimental conditions and quality measures.
Nitrogen and phosphorus utilization,and their budget in coastal intensive ponds stocked with allogynogenetic silver crucian carp fed by pellets were studied,and the effects of two different crude protein pellets on growth and feed utilization by the rearing target were investigated.The results showed that growth performance,feed conversion rate(FCR) and phosphorus utilization rate(PUR) in fish fed by high protein content pellets(33%) were higher than that by low protein content pellets(30%),but nitrogen utilization rate(NUR) in fish fed by high protein pellets was lower than that by low protein content pellets.The ratios of nutrients utilized by crucian carp production ranked as follows:nitrogen(N:33.1%~33.3%) and phosphorus(P:25.6%~26.9%) in coastal intensive ponds,respectively.In closed pond systems,low utilization rate of N and P in intensive culture pond was the direct cause of nutrient accumulation in the such systems.And most of the elements of N and P were stranded or deposited in the pond system.The present study indicated that feeding appropriate N/P pellets and rearing filter-feeding fish were one of effective measures to increase N and P output via fish harvest and and so to alleviate environmental water pollution.
We report a distributed fiber optic parametric amplifier (FOPA). The effects of pumping and fiber parameters on the gain characteristics of the distributed FOPA are investigated. Combined with the simulation results, the, it indicates the necessity of low attenuation coefficient fiber in distributed fiber parametric amplification system, the importance of low dispersion slope for gain spectral width and the limited role of pump optical power for effective amplification distance enhancement of the system.
Continuous MXene/graphene fibers are fabricatedviawet-spinning assembly strategy, from which fiber-constructed supercapacitors are obtained that exhibit both high capacitance and flexibility.
'/%3e%3cuse xlink:href='%23a' transform='rotate(23.036 .093 25.536)'/%3e%3cuse xlink:href='%23a' transform='rotate(45.87 1.273 16.18)'/%3e%3cuse xlink:href='%23a' transform='rotate(69.945 .996 12.078)'/%3e%3cuse xlink:href='%23a' transform='rotate(20.66 -19.689 31.932)'/%3e%3c/svg%3e)