In this work, a strategy of preparing multilayer Sic/ZrB2-crSi2-Si/Siccoating at low-temperature by combining chemical vapor deposition (cVD), brush-sintering and preoxidation was proposed for c/ccomposites. The coa...
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In this work, a strategy of preparing multilayer Sic/ZrB2-crSi2-Si/Siccoating at low-temperature by combining chemical vapor deposition (cVD), brush-sintering and preoxidation was proposed for c/ccomposites. The coated c/ccomposites could maintain stable and long-term oxidation resistance at 1473-1673 K, and the specific mass loss was only 8.05 mg center dot cm-2 after 1673 K/340 h oxidation. The coupling mechanism of the preparation process on the microstructure and performance, the kinetics process of oxidation behavior and the protection/failure mechanism of the coating were analyzed. Furthermore, the importance of organosilicon (SicxOy) in the process of self-healing and oxidation resistance was enlightened.
By combining atomistic simulations with a detailed analysis of individual atomic hops, we show that the diffusion of carbon in a binary Fe-c glass exhibits strong (anti-)correlations and is largely determined by the l...
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By combining atomistic simulations with a detailed analysis of individual atomic hops, we show that the diffusion of carbon in a binary Fe-c glass exhibits strong (anti-)correlations and is largely determined by the local environment. Higher local carbon concentrations lead to slower atomic mobility. Our results help explain the increasing stability of Fe-c (and, potentially, other similar metal-metalloid glasses) against crystallization with increasing solute concentration.
作者：
Huo, HangWang, JinFan, QikuiHu, YanjingYang, JianShenzhen Univ
Coll Mat Sci & Engn Guangdong Res Ctr Interfacial Engn Funct Mat Shenzhen Key Lab Special Funct Mat Shenzhen 518060 Peoples R China Shenzhen Univ
Coll Phys & Optoelect Engn Key Lab Optoelect Devices & Syst Shenzhen 518060 Peoples R China Harbin Inst Technol
Sch Chem & Chem Engn MIIT Key Lab Crit Mat Technol New Energy Convers Harbin 150001 Heilongjiang Peoples R China
The electroreduction of carbon dioxide is a promising strategy to synthesize value-added feedstocks and realize carbon neutralization. copper catalysts are well-known to be active for selective electroreduction of cO2...
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The electroreduction of carbon dioxide is a promising strategy to synthesize value-added feedstocks and realize carbon neutralization. copper catalysts are well-known to be active for selective electroreduction of cO2 to multicarbon products, although the role played by the surface architecture is not fully understood. Herein, mesoporous cu nanoribbons are constructed via in-situ electrochemical reduction of cu based metal organic frameworks for the highly selective synthesis of c2+ chemicals. With the mesoporous structure, a high c2+ Faradaic efficiency of 82.3% with a partial current density of 347.9 mA cm(-2) is achieved in a flow-cell electrolyzer. controlled electroreduction of cO2 with cu nanoribbons exhibited clearly greater selectivity towards c2+ products than cu nanoleaves and cu nanorods without porous structures. Finite difference time domain results indicate that the mesoporous structure can enhance the electric field on the catalyst surface, which increases the concentration of K+ and OH-, thus allowing the authors to promote cO2 reduction pathways towards c2+ products.
This study aimed to appraise the anti-Parkinson's potential of rhinacanthin-c (Rc). Rc (5, 10, and 20 mg/kg) was orally administered for 25 days in albino mice to treat haloperidol-induced parkinsonism (1 mg/kg). ...
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This study aimed to appraise the anti-Parkinson's potential of rhinacanthin-c (Rc). Rc (5, 10, and 20 mg/kg) was orally administered for 25 days in albino mice to treat haloperidol-induced parkinsonism (1 mg/kg). Rc significantly (p < .05) improved the motor symptoms in block, bar, rotarod, and balance beam walking tests in treated mice. Rc reduced the cataleptic effect dose-dependently. The Rc therapy notably (p < .001) enhanced reduced glutathione, catalase, and superoxide dismutase levels while decreased malondialdehyde and nitrite levels in the tissue homogenates of the treated mice. The Rc therapy significantly (p < .01-.001) restored the dopamine, norepinephrine, and serotonin levels in the brain tissue of treated mice as co-evidenced from brain histology. Rc did not adversely affect complete blood count, and liver and kidney function tests. Taken together, these results have shown that Rc is effective in treating motor and non-motor symptoms of Parkinson's disease. Practical applications Rhinacanthus nasutus is a medicinally rich plant that has folklore use in several ailments. The plant possessed multiple pharmacological activities due to the presence of naphthoquinones. The major compound of this plant rhinacanthin-c was used in the present study to evaluate it's anti-Parkinson's activity. The results provide scientific evidence of the anti-Parkinson's potential of rhinacanthin-c that support the use of R. nasutus leaves in the prevention and treatment of Parkinson's disorder.
We explore the existence of MP-inverse in rings with involution. In addition, we give some equivalent conditions for an element of a c*-algebra to be a weighted-EP element and weighted partial isometry. (c) 2020 Elsev...
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We explore the existence of MP-inverse in rings with involution. In addition, we give some equivalent conditions for an element of a c*-algebra to be a weighted-EP element and weighted partial isometry. (c) 2020 Elsevier Inc. All rights reserved.
c/c-Siccomposites fabricated through Liquid Silicon Infiltration were tested under monotonic tension with in situ X-ray computed tomography. The specimens had different fibre orientations with respect to the tensile ...
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c/c-Siccomposites fabricated through Liquid Silicon Infiltration were tested under monotonic tension with in situ X-ray computed tomography. The specimens had different fibre orientations with respect to the tensile direction, 0?/90? and ?45?, such that the tension accounted for in-axis and off-axis loads, respectively. The 3D XcT images provided explicit visualisations and quantitative measurements of the distributions of Sic-Si and the orientations of the c fibre bundles. The full-field displacement and strain fields were measured by Digital Volume correlation, observing a difference in the local deformations in response to the in-axis and off-axis loading. In both specimens, the tensile load triggered significant strain localisations at low stress (<50 MPa). Strong local deformations, observed at both low and high applied stresses, were mostly in the through-thickness direction, indicating local delamination. These observations show the importance of residual stresses to damage development in c/c-Siccomposites.
The presented study synthesized c:Se NPs via a combination of the laser along with magnetic field at various laser pulse energies 200, 600 and 1000mJ with 100 shots, have been deposited on the porous silicon (PS) thro...
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The presented study synthesized c:Se NPs via a combination of the laser along with magnetic field at various laser pulse energies 200, 600 and 1000mJ with 100 shots, have been deposited on the porous silicon (PS) through the use of drop-casting method. The pattern of the X-ray diffraction (XRD) had indicated the nanocrystaline of specimens. In Atomic force microscopy (AFM), which shows agglomeration of c:Se NPs increased, the distribution of the granularity showed that the distribution of part was almost Gaussian, also the transmission electron microscope (TEM) indicated that the synthesized c:Se particles have an average particle size of 35 nm. Bright-field TEM images show complementary contrast, confirming the formation of core/shell structures. The optical measurements in wavelength range ultraviolet-visible near infrared (UV-vis-NIR) as well as a transition of indirect type with 4 eV band gap is specified. Also, the electrical characteristics like barrier height (phi B), ideal factor (n) for Al/c:Se NPs/PS/Si/Al heterojunction were concluded with measurements of current-voltage (I-V). Lastly, the operation temperature variations associated with NO2 and NH3 gas sensors are subjected to fabrication from the prepared samples on response time, sensor sensitivity and recover time was examined. The maximum sensitivity of c:Se/PS at 1000 mJ gas sensor to 60 ppm of NO2 about 202.5% at around 100 degrees c, also the maximum sensitivity of c:Se/PS at 1000mJgas sensor to 200 ppm of NH3 can reach 17.9%, and the optimum sensing temperature of c: Se/PS sensor is at around 150 degrees c.
In this work, carbon:Selenium (c:Se) nanoparticles (NPs) are preparation by laser ablation at diverse laser energy 200, 400, 600,800 and 1000 mJ with 100 shots and laser wavelength 1064 nm then deposited on porous sil...
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In this work, carbon:Selenium (c:Se) nanoparticles (NPs) are preparation by laser ablation at diverse laser energy 200, 400, 600,800 and 1000 mJ with 100 shots and laser wavelength 1064 nm then deposited on porous silicon (PS). PS are fabricated using electrochemical etching (EcE) method for p-type crystalline silicon (c-Si) wafers of (100) *** pattern of X-ray diffraction (XRD) showed the sample's *** of the Atomic force microscope (AFM) analysis an average diameter of 39.76 nm coordinated in a rod-like shape appears for c:Se NPs. UV-vis result displayed that the optical energy gap of the nanoparticles increases. The electrical properties such as barrier height (phi B) and ideality factor (n) of the Al/c:SeNPs/PS/Si/Al heterojunction were determined from the current density-voltage (J-V) measurements.
The corrosion behavior of Ti2Alc MAX phase coatings coated on 1cr11Ni2W2MoV substrates in Nacl deposit in water vapor at 600 degrees c has been fully investigated. The results demonstrated that the substrates underwen...
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The corrosion behavior of Ti2Alc MAX phase coatings coated on 1cr11Ni2W2MoV substrates in Nacl deposit in water vapor at 600 degrees c has been fully investigated. The results demonstrated that the substrates underwent serious corrosion, but the coatings performed better. The mass gain per unit area of coatings was less than 1/6 of substrates, because of the formed compact and uniform corrosion scale. Such dense corrosion scale was composed of NaxTiyOz fine grains with the size of 11 +/- 0.4 nm and amorphous Al2O3 phases which self-healed the generated defects during corrosion, benefiting from the novel layered structure of MAX phase.
Based on the improved high-efficiency sewage treatment performance of submerged membrane bioreactors (SMBRs), we focused on how to adjust the c/N ratio of the influent water during reactor start-up to prevent an exces...
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Based on the improved high-efficiency sewage treatment performance of submerged membrane bioreactors (SMBRs), we focused on how to adjust the c/N ratio of the influent water during reactor start-up to prevent an excessive c/N ratio from causing membrane fouling. In this study, an experimental method of gradually adjusting the influent c/N ratio to quickly start the reactor was proposed, and the results showed that biofilm formation in R1 (SMBR, three influent c/N ratios of 5, 10, and 20) was approximately completed in 32 days, shorter than that (40 days) required in R2 (SMBR, influent c/N ratio of 20). Higher removal efficiencies of 76.4% for TN, 70.1% for cOD, and 79.2% for NH3-N were obtained in R1 than in R2. The high-throughput sequencing results indicated that after 150 days of operation, the Shannon index of bacteria in R1 increased from 2.97 to 4.41 and the growth of Nakamurella, Ferruginibacter, and Rhodanobacter was promoted in the reactor, which indicated substantial microbial diversity in the biofilm. Therefore, gradually adjusting the influent c/N ratio could effectively enhance the nitrogen removal performance of denitrification microbial communities in SMBRs. This study offers a reliable approach for starting the SMBR-enhanced biological nutrient removal process in wastewater treatment plants by gradually adjusting the influent c/N ratio.
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