Showing papers by "South China University of Technology published in 2007"
TL;DR: In this article, the antioxidant capacity and total phenolic content of 23 microalgae were evaluated, using Trolox equivalent antioxidant capacity assay and the Folin-Ciocalteu method, respectively.
631 citations
TL;DR: In this article, a kind of spherical cellulose nanocrystals was prepared by hydrolysis of microcrystalline cellulose with mixed acid and two methods were used: diminishing the acid sulfate groups by desulfation and neutralizing them by using NaOH solution.
554 citations
TL;DR: In this article, a series of starburst triarylamine fluorophores SBCHO, DBCHO and CZCHO were investigated as non-doped host emitters and hole transporters.
Abstract: A new series of starburst triarylamine fluorophores SBCHO, DBCHO, CZCHO, CZCN, and SBCN, that incorporate diphenylamine or carbazole as the electron donor and dicyanovinyl or aldehyde as the electron acceptor, has been prepared and their photophysical properties are investigated. In sharp contrast to most red-emitting dopants, which show serious aggregation-caused quench phenomena, the new starburst triphenylamine derivatives reported here show unique enhanced emission in the solid state or upon aggregation. Organic light emitting diodes using these compounds as non-doped host emitters and hole transporters have been fabricated. The highest external quantum yield reaches 2.09 % for CZCHO. SBCHO was investigated as a chlorine gas fluorescence (FL) solid-film sensor for the first time. The high-intensity emission was ‘turned off' immediately after being blown by Cl2 gas.
512 citations
TL;DR: The results show that the oxygenous functional groups can be formed on MWCNTs after M WCNTs were treated by concentrated nitric acid.
365 citations
TL;DR: A Fourier method is proposed for analyzing the stability and convergence of the implicit difference approximation scheme (IDAS), derive the global accuracy of the IDAS, and discuss the solvability.
351 citations
TL;DR: The results show that zeta potential has good corresponding relation with absorbency, and the higher absolute value of zETA potential and the absorbency are, the better dispersion and stability in system is.
346 citations
TL;DR: Results indicate that sugar catalysts are highly effective, minimally polluting and re-usable catalysts that are highly suited to the production of biodiesel from waste oils with a high acid value.
345 citations
TL;DR: In this article, the influence of CO 2 on the oxygen permeation performance of perovskite-type (Ba 0.5 Sr 0.8 Fe 0.2 )O 3− δ (BSCF) membranes under different experimental conditions is presented.
339 citations
TL;DR: Using the decision-and experiential-oriented perspectives as theoretical guides, this article reported an empirical assessment of service quality in restaurant operations and proposed and tested a conceptual model using structural equation modeling using data from a sample of 284 customers from two large full-service restaurants in southern China.
295 citations
TL;DR: The results showed that the thermophilic duration of bin 1 and bin 2 was long enough to satisfy the sanitary standard, and swine manure could reach maturity, and a low initial C/N ratio (20) could be suggested in the composting ofSwine manure with rice straw.
290 citations
TL;DR: In this article, the synthesis and optoelectronic properties of various π-conjugated-, σ-conjunctional, σconjugation-, ρ-conjunctive-, pendanted-, and hyperbranched or dendritic silole-containing polymers (SCPs) are described.
Abstract: In this review, the synthesis and optoelectronic properties of various π-conjugated-, σ-conjugated-, pendanted-, and hyperbranched or dendritic silole-containing polymers (SCPs) are described So far, substituted silole, dibenzosilole, dithienosilole, and bis-silicon-bridged stilbene have been incorporated into SCPs The tunable bandgaps from 40-155 eV, variable fluorescent colors from UV to blue, green, and red (RGB) light, fluorescent chemo-sensors for 2,4,6-trinitrotoluene (TNT)-type explosives, aggregation-induced emission, efficient electroluminescence emissions for RGB lights, phosphorescent hosts with high triplet energy level, efficient solar cells, stable field-effect transistors with high hole mobility in air, and attenuation of strong laser power, are the important features of SCPs
TL;DR: A survey of solar-based driven thermoelectric technologies and their applications is presented in this paper, where a brief analysis of the environmental problems related to the use of conventional technologies and energy sources is presented and the benefits of using renewable energy systems are outlined.
Abstract: In this paper a survey of solar-based driven thermoelectric technologies and their applications is presented. Initially, a brief analysis of the environmental problems related to the use of conventional technologies and energy sources is presented and the benefits offered by thermoelectric technologies and renewable energy systems are outlined. The development history of solar-based thermoelectric technologies is introduced together with the discussion of the existing drawbacks of current systems. Typical applications of the solar-driven thermoelectric refrigeration and the solar-driven thermoelectric power generation are presented in order to show to the reader the extent of their applicability. The application areas described in this paper show that solar-driven thermoelectric technologies could be used in a wide variety of fields. They are attractive technologies that not only can serve the needs for refrigeration, air-conditioning applications and power generation, but also can meet demand for energy conservation and environment protection.
TL;DR: In this paper, a naturally occurring microtubullar silicate, halloysite nanotubes (HNTs), was co-cured with epoxy/cyanate ester resin to form organic-inorganic hybrids.
Abstract: A naturally occurred microtubullar silicate, halloysite nanotubes (HNTs), was co-cured with epoxy/cyanate ester resin to form organic–inorganic hybrids. The coefficient of thermal expansion (CTE) of the hybrids with low HNT concentration was found to be substantially lower than that of the plain cured resin. The moduli of the hybrids in the glassy state and rubbery state were significantly higher than those for the plain cured resin. The dispersion of HNTs in the resin matrix was very uniform as revealed by the transmission electron microscopy (TEM) results. The interfacial reactions between the HNTs and cyanate ester (CE) were revealed by the results of Fourier transform infrared spectroscopy (FTIR) and x-ray photoelectron spectroscopy (XPS). The substantially increased properties of the hybrids were attributed to the covalent bonding between the nanotubes and the matrix.
TL;DR: In this paper, the authors examined the relationships among work-family conflict, organizational commitment, and job satisfaction in a hotel setting, and found that the affective component of OC has stronger direct effects on job satisfaction than normative OC; continuance commitment had no effect.
TL;DR: Two CPSO methods based on the logistic equation and the Tent equation are presented to solve economic dispatch (ED) problems with generator constraints and applied in two power system cases.
TL;DR: Wang et al. as mentioned in this paper proposed a tourism motivations model for Chinese seniors, which consists of two main components: external conditions include societal progress, personal finance, time, and health, of which personal finance and time are mediated through family support and responsibility; internal desires include improving well-being, escaping routines, socializing, seeking knowledge, pride and patriotism, personal reward, and nostalgia.
TL;DR: Light is shed on STSS triggered by SS2 at the genomic level, facilitates further understanding of its pathogenesis and points to directions of development on some effective strategies to combat highly pathogenic SS2 infections.
Abstract: Background Streptococcus suis serotype 2 (SS2) is an important zoonotic pathogen, causing more than 200 cases of severe human infection worldwide, with the hallmarks of meningitis, septicemia, arthritis, etc. Very recently, SS2 has been recognized as an etiological agent for streptococcal toxic shock syndrome (STSS), which was originally associated with Streptococcus pyogenes (GAS) in Streptococci. However, the molecular mechanisms underlying STSS are poorly understood.Methods and FindingsTo elucidate the genetic determinants of STSS caused by SS2, whole genome sequencing of 3 different Chinese SS2 strains was undertaken. Comparative genomics accompanied by several lines of experiments, including experimental animal infection, PCR assay, and expression analysis, were utilized to further dissect a candidate pathogenicity island (PAI). Here we show, for the first time, a novel molecular insight into Chinese isolates of highly invasive SS2, which caused two large-scale human STSS outbreaks in China. A candidate PAI of ∼89 kb in length, which is designated 89K and specific for Chinese SS2 virulent isolates, was investigated at the genomic level. It shares the universal properties of PAIs such as distinct GC content, consistent with its pivotal role in STSS and high virulence.ConclusionsTo our knowledge, this is the first PAI candidate from S. suis worldwide. Our finding thus sheds light on STSS triggered by SS2 at the genomic level, facilitates further understanding of its pathogenesis and points to directions of development on some effective strategies to combat highly pathogenic SS2 infections.
TL;DR: The nanocomposite electrode with a slight modification exhibited high sensitivity, high selectivity, and low detection limit in amperometric glucose sensing at physiological neutral pH (poised at a negative potential) and comparable sensitivity, selectivity and linearity compared to the PtPbNP/MWCNT nanocomPOSite.
01 Jun 2007
TL;DR: HCOEA is tested on 13 well-known benchmark functions, and the experimental results suggest that it is more robust and efficient than other state-of-the-art algorithms from the literature in terms of the selected performance metrics.
Abstract: This paper presents a novel evolutionary algorithm (EA) for constrained optimization problems, i.e., the hybrid constrained optimization EA (HCOEA). This algorithm effectively combines multiobjective optimization with global and local search models. In performing the global search, a niching genetic algorithm based on tournament selection is proposed. Also, HCOEA has adopted a parallel local search operator that implements a clustering partition of the population and multiparent crossover to generate the offspring population. Then, nondominated individuals in the offspring population are used to replace the dominated individuals in the parent population. Meanwhile, the best infeasible individual replacement scheme is devised for the purpose of rapidly guiding the population toward the feasible region of the search space. During the evolutionary process, the global search model effectively promotes high population diversity, and the local search model remarkably accelerates the convergence speed. HCOEA is tested on 13 well-known benchmark functions, and the experimental results suggest that it is more robust and efficient than other state-of-the-art algorithms from the literature in terms of the selected performance metrics, such as the best, median, mean, and worst objective function values and the standard deviations
TL;DR: In this paper, the authors studied soil contamination in the vicinity of the Dabaoshan Mine, Guangdong Province, China, through determination of total concentrations and chemical speciation of the toxic metals, including Cu, Zn, Cd, and Pb, using inductively coupled plasma mass spectrometry.
TL;DR: In this article, piezoelectric ceramics patches are used as sensors and actuators to suppress the vibration of the smart flexible clamped plate, and an efficient control method by combining positive position feedback and proportional-derivative control is proposed for vibration reduction.
TL;DR: In this article, membrane ultra-filtration was used to separate the peptides of wheat gluten into permeate (P) and retentate (5-K) fractions, and the antioxidative activity of the P fraction was almost the same as that of vitamin E at pH 7.0.
TL;DR: A novel amperometric glucose biosensor based on the nine layers of multilayer films composed of multi-wall carbon nanotubes, gold nanoparticles and glucose oxidase was developed and exhibited good reproducibility, long-term stability and the negligible interferences of ascorbic acid, uric acid and acetaminophen.
TL;DR: Results show that flavonoids and saponins caused a significant reduction of walking time and coordinated movement ability of mouse, and significantly prolonged its sleeping time and increased the sleeping number of animals at 50 mg kg−1, ip, superthreshold dose induced by coeliac injection of sodium barbital.
TL;DR: The results confirmed that the assembling process of multilayer films was simple to operate, the immobilized GOD displayed an excellent catalytic property to glucose, and GNp in the biosensing interface efficiently improved the electron transfer between analyte and electrode surface.
TL;DR: In this paper, the authors present the results of a study on the static behavior of metallic beams bonded with carbon fiber reinforced polymer (CFRP) plates, and they show the influencing factors on the strength of the metallic beams reinforced by different types of CFRP plates, the effects of the tapers at the plate ends and of the spew fillets beyond the plate end.
TL;DR: In this article, the effect of lignosulfonates on coal water slurry viscosity was investigated and it was shown that the adsorption behavior of the SL on the coal water interface has a much greater effect on the viscosities of coal water.
TL;DR: In this paper, the FTIR transmission spectrum shows that pyridine replaces the surfactant (HDA) molecules attached to the nanocrystals' surface after posttreatment of CdS nanorods by refluxing in pyrinyidine.
Abstract: Multiarmed CdS nanorods have been used as the electron acceptors to fabricate efficient hybrid solar cells. It was demonstrated that when pyridine was used as a solvent for spin coating an active layer consisting of MEH-PPV/CdS blend instead of chlorobenzene, short-circuit current of the device can typically be increased by six times. The FTIR transmission spectrum shows that pyridine replaces the surfactant (HDA) molecules attached to the nanocrystals' surface after posttreatment of CdS nanorods by refluxing in pyridine. Transmission electron microscopy, atomic force microscopy, current−voltage characteristics, photocurrent action spectra measurements, and photoluminescence quenching were used to characterize MEH-PPV/CdS blend spin-coated from pyridine solution. Thermal treatment of the blend films can further enhance the short-circuit current in the device. Best device performance was achieved with a power conversion efficiency of 1.17% under AM1.5 illumination (100 mW cm-2), significantly higher than t...
25 Sep 2007-Materials Science and Engineering A-structural Materials Properties Microstructure and Processing
TL;DR: In this article, multiwalled carbon nanotubes (MWCNTs) were acidified by concentrated nitric acid and were employed as adsorbent to study the adsorption characteristic for Pb(II) from aqueous solution.
Abstract: Multiwalled carbon nanotubes (MWCNTs) were acidified by concentrated nitric acid and were employed as adsorbent to study the adsorption characteristic for Pb(II) from aqueous solution. The results show that adsorption capacity of MWCNTs treated by concentrated nitric acid can be greatly enhanced. The adsorption of acidified MWCNTs to Pb(II) fits to the Langmuir model. The larger adsorption capacity of acidified MWCNTs for Pb(II) is mainly due to the oxygenous functional groups formed on the surface of acidified MWCNTs which can react with Pb(II) to form salt or complex deposited on the surface of MWCNTs. The equilibrium time of adsorption for acidified MWCNTs to Pb(II) is about 20 min, which is much shorter than that of activated carbon (about 120 min). The regeneration performance for the first time was studied, it is showed that the Pb(II) can be easily regenerated from acidified MWCNTs by adjusting the solution to pH 2.