In this study, a novel green phase change material (PCM) eutectic mixture was investigated for its applications as potential thermoregulator for temporary structures built in tropical climate ...regions, such as Vietnam. The tests were conducted in Hanoi (Vietnam) from 1st June 2021 to 26th July 2021 under artificial solar irradiation and in real weather conditions. Thermal performance of the PCM mixture was investigated in a testing system without air conditioner, including two test rooms (i.e. Reference Room and Material Room) with thermal data being automatically collected by an array of temperature data logger recorders. The Reference Room was utilized to ensure similar base-line conditions when comparing data received from the Material Room. Results showed that when combining the PCM mixture with drop ceiling, the thermal performance was superior to that of the traditional drop ceiling and foam insulation combination. With PCM mixture loading of 1.200 g m
−2
, the peak temperature point inside testing rooms was delayed up to 4 hours, while the PCM system was also able to completely re-solidify during the subsequent night. These results showed that the novel green PCM mixture can be used for thermoregulation applications in tropical climate regions, such as Vietnam.
This study presents high‐resolution optical inspection methods to evaluate the assembly yield of densely‐aligned NR LED array for self‐emitting inorganic material‐based display. Fast line scanning ...images and their deep learning‐based image analysis enabled us to quantitively investigate the assembly yield of NR LEDs even up to 5300 pixel per inch in which, thereafter, automatic optical inspection (AOI) accuracy reaches up to 97 % after 8000 times iteration. Furthermore, confocal photoluminescence optical microscopic system with picoseconds time resolving capability investigated tens nanometer spatially‐resolved emission characteristics of NR LEDs while also showing the non‐radiative recombination from the damaged active layers. Therefore, we believe that this study contributes a significant step toward inspection process of micro LEDs and their manufacturing development.
•Three 1-picolinoyl-4-substituted thiosemicarbazides and six corresponding heteroleptic Pd(II) and Pt(II) complexes have been synthesized, structurally determined and theoretically ...studied.•Antimicrobial activities against Gram-positive bacteria, Gram-negative bacteria and yeast as well as anticancer activities against MCF7 and HepG2 cancer cells of the compounds were investigated.•The in vitro cytotoxicity against human cancerous cell lines of most metal complexes is significantly higher than that of corresponding organic ligands and comparable with cisplatin under the same condition.
Reactions of three 1-picolinoyl-4-substituted thiosemicarbazides H2L, namely H2LEt, H2LCy, and H2LPh, with equimolar amounts of common Pd(II) or Pt(II) complexes M(PPh3)2Cl2 (M = Pd, Pt) bring about the formation of stable heteroleptic complexes with the compositions M(L)(PPh3) (M = Pd, Pt). Their molecular structures show mononuclear square planar complexes in which the acyl thiosemicarbazides are doubly deprotonated and serve as tridentate ligands bonded to the metal ion center via (Npyridine, N1, S) donor sets. The organic ligands H2LEt and H2LPh as well as all of their metal complexes show only weak inhibitory effects on microbial strains examined, whereas the metal complexes of H2LCy exhibit good inhibition towards B. subtilis and L. fermentum with MIC values lower than those of ampicillin. Furthermore, the in vitro cytotoxicity of H2L and the complexes were tested against cancerous cell lines MCF7 and HepG2. The organic ligands exhibit moderate antiproliferative effects with the increasing order of activity H2LEt < H2LCy < H2LPh for both cell lines. Surprisingly, except for the Pt(II) complex of H2LCy, the other metal complexes are highly toxic with IC50 in the range of 4.22±0.37 – 16.0±1.05 μM for HepG2 and 3.26±0.41 – 20.6±2.12 μM for MCF7. Most IC50 values of the metal-based compounds are comparable with those of cisplatin under the same condition.
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In this study, rice husk biochar (RHB) and ZnO nanoparticles loaded rice husk biochar (RHB-ZnO-3 served to adsorb Reactive red 24 (RR24) in an aqueous solution. Effects of the ZnO nanoparticles ...loading ratio, solution pH, contact time, and initial RR24 concentration were evaluated utilizing detailed batch adsorption conditions. Isotherm and kinetic models helped to analyze the RR24 adsorption. Shown here is that the ratio of 3% (w/w) ZnO nanoparticles to RHB proved to be the best for fabricating highly effective modified rice husk biochar. In this scenario, the BET surface area of RHB-ZnO-3 was 13.84 m2/g, more than triple the original RHB (4.01 m2/g). Experimental results strongly suggest that RR24 highest adsorption capacities onto RHB-ZnO-3 and RHB were 174.91 mg/g and 88.51 mg/g, respectively. The best pH contact time and adsorbent rate for RR24 removal were 3, 60 min and 1.0 g/L, respectively. RR24 adsorption onto RHB and RHB-ZnO-3 were well described by Pseudo-second order kinetic and Langmuir isotherm models. Adsorption capacities of RHB and RHB-ZnO-3 did not diminish significantly after five cycles of adsorption-desorption. RHB and RHB-ZnO-3 could remove: firstly, more than half of the color and COD (50% color, 52.5% COD); and secondly, most of the turbidity (82.8%) from real textile wastewater. Electrostatic attraction, π-π interaction and pore filling were the main adsorption mechanisms of RR24 onto RHB and RHB-ZnO-3.
•Right ratio of ZnO/rice husk biochar was identified for producing modified biochar.•Both RHB and RHB-ZnO coud remove RR24 effectively in wastewater.•RHB-ZnO adsorption capacity was much better than RHB due to ZnO on its surface.•Isotherm and kinetics RR24 adsorption were well fitted with Langmuir and PSO models.•Mechanisms included electrostatic attraction, pore filling, and π-π interaction.
Unsymmetrical tetradentate Schiff base Fe(III) and Cu(II) complexes were prepared by the coordination of some unsymmetrical tetradentate Schiff base ligands with CuClsub.2·2Hsub.2O or ...FeClsub.3·6Hsub.2O. The obtained complexes were characterized by ESI-MS, IR, and UV-Vis. The spectroscopic data with typical signals are in agreement with the suggested molecular formulae of the complexes. Their cyclic voltammetric studies in acetonitrile solutions showed that the Cu(II)/Cu(I) and Fe(III)/Fe(II) reduction processes are at (-)1.882-(-) 1.782V and at (-) 1.317-(-) 1.164V, respectively. The in vitro cytotoxicity of obtained complexes was screened for KB and Hep-G2 human cancer cell lines. The results showed that almost unsymmetrical tetradentate Schiff base complexes have good cytotoxicity. The synthetic complexes bearing the unsymmetrical tetradentate Schiff base ligands with different substituted groups in the salicyl ring indicate different cytotoxicity. The obtained Fe(III) complexes are more cytotoxic than Cu(II) complexes and relative unsymmetric Schiff base ligands.
In this letter, the outage performance of dualhop cooperative spectrum sharing systems with a direct link is investigated. A selection combining receiver is employed at the destination in order to ...combine the signals received from the decode-and-forward (DF) relay and from the source. Assuming independent non-identically distributed Nakagami-m fading channels, exact and asymptotic closed-form expressions are derived for the outage probability. Our results reveal that the diversity order of the considered system is solely determined by the fading severity parameters of the secondary network, being equal to min(m 1 , m 2 ) + m 0 , where m 0 , m 1 , and m 2 represent the fading severity parameters of the secondary nodes i.e., source→destination, source→relay, and relay→destination links, respectively.
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