Showing papers by "Henan Normal University published in 2010"
TL;DR: In this article, a series of ionic liquids (ILs) have been synthesized by coupling the 1-N-butyl-3-methylimidazolium cation [C4mim]+ with the Bronsted basic anions.
362 citations
TL;DR: The results showed that the photocatalytic degradation kinetics of MB fitted the pseudo-first-order kinetics and the Langmuir-Hinshelwood model.
240 citations
TL;DR: In this article, the effects of ionic liquid (IL)-based aqueous two-phase systems (ATPSs) are reviewed and highlighted the possible directions of future developments.
Abstract: As a new separation technology, ionic liquid (IL)-based aqueous two-phase systems (ATPSs) are attracting the attention of a growing number of scientists and engineers. This article reviews the significant progress that has been made in the field and highlights the possible directions of future developments. We focus on the effects of inorganic salts and ILs on the phase equilibrium of ATPSs, the microstructure of the ATPSs, and their applications in extraction and separation (e.g., small organic molecules, biochemicals, and radiological isotopes). We also address the recovery and the reuse of ILs and the work needed in future.
193 citations
TL;DR: Two novel "turn-on" fluorescent probes with perylene tetracarboxylic diimide (PDI) as the fluorophore and two different di-(2-picolyl)-amine groups as the metal ion receptor were successfully synthesized with satisfactory yields, suggesting that PDIs are favorable fluorophores for a "turn on" fluorescence probe for paramagnetic transition metal ions because of their high oxidation potential.
Abstract: Two novel “turn-on” fluorescent probes with perylene tetracarboxylic diimide (PDI) as the fluorophore and two different di-(2-picolyl)-amine (DPA) groups as the metal ion receptor (PDI-1 and PDI-2) were successfully synthesized with satisfactory yields. PDI-1 exhibited high selectivity toward Ni2+ in the presence of various other metal cations including Zn2+, Cd2+ and Cu2+ which were expected to interfere significantly. A 1 : 2 stoichiometry was found for the complex formed by PDI-1 and Ni2+ by a Job's plot and by non-linear least square fitting of the fluorescence titration curves. By introducing an extra diamino ethylene group between DPA and the phenyl bridge, the receptor was modified and the high selectivity of the sensor toward Ni2+ shifted to Fe3+. The enhancement factor of the fluorescence response of PDI-2 to Fe3+ was as high as 138. The binding behavior of the receptors in these two compounds is affected significantly by the PDI fluorophores. Most interestingly, both Ni2+ and Fe3+ are paramagnetic metal ions, which are known as fluorescence quenchers and are rarely targeted with “turn-on” fluorescence probes. This result suggests that PDIs are favorable fluorophores for a “turn-on” fluorescence probe for paramagnetic transition metal ions because of their high oxidation potential.
134 citations
TL;DR: A series of pyrimidine nucleoside-pyrano[3,2-c]pyridone or pyrano(4,3-b)pyran hybrids were efficiently obtained and showed encouraging biological activities.
119 citations
TL;DR: In this paper, the first principle density functional theory with the inclusion of the on-site Coulomb interaction (DFT+U) was used to investigate the interaction of a water molecule with the (111) surfaces of stoichiometric and reduced ceria.
Abstract: The interaction of a water molecule with the (111) surfaces of stoichiometric and reduced ceria is investigated using first principle density functional theory with the inclusion of the on-site Coulomb interaction (DFT+U). It is found that on the stoichiometric ceria(111) surface, the water molecule is adsorbed spontaneously through single hydrogen bond configuration. In contrast, on the lightly reduced ceria(111), there exist both molecular adsorption (no-H-bond configuration) and dissociative adsorption (surface hydroxyl) modes. It is obvious that oxygen vacancies can enhance the interaction of water with the substrate. Phase diagrams for stoichiometric and reduced ceria(111) surfaces in equilibrium with water vapor in the complete range of experimentally accessible gas phase condition are calculated and discussed combining the DFT results and thermodynamics data using the ab initio atomistic thermodynamic method. We present a detailed analysis of the stability of the water-ceria system as a function of the ambient conditions, and focus on two important surface processes for water adsorption on the stoichiometric and on the lightly reduced surfaces, respectively.
111 citations
TL;DR: A new liquid-phase microextraction for the pre-concentration of lead was developed and the results showed that the proposed method was excellent for the future use and the recoveries were in the range of 94.8-104.1%.
102 citations
TL;DR: The IL aggregates were found to grow slowly as the increase of the salt concentrations under studied static conditions, and resulting in the increased aggregation number of the IL.
Abstract: Understanding of the specific salt effect on the aggregation behavior of ionic liquids (ILs) is relevant to multiple applications. In this work, the influence of a series of 15 salts on the aggregation behavior of [C10mim]Br in aqueous solutions has been investigated by conductivity, fluorescence, and dynamic light scattering. It was shown that NaCl, NaBr, NaI, CH3CO2Na, NaSCN, NaNO3, NaBrO3, NaClO3, C6H5COONa, Na2CO3, Na2SO4, Na2C4H4O6, and Na3CH5O7 have salting-out effect, whereas FeBr3 and AlBr3 have salting-in effect on the aggregation of [C10mim]Br in aqueous solutions. The effect of anions of the added sodium salts on the critical aggregation concentration (CAC), degree of anionic binding (β), and aggregation number (Nagg) of the IL basically follows the Hofmeister series, and the CAC values decrease but the β and Nagg values increase with increasing concentration of the salts. Hydrophobicity of the anions is suggested to play important roles in the salt effect on the aggregation of [C10mim]Br in aq...
96 citations
TL;DR: In this paper, Li[Ni 1/3 Co1/3 Mn 1 /3 ]O 2 -based laminates of approximately the same loading and of varying levels of poly(vinylidene fluoride) (PVDF) binder and acetylene black (ratio held constant) were fabricated and calendered to different porosities, with the objective to investigate performance on a volume basis.
Abstract: Li[Ni 1/3 Co 1/3 Mn 1/3 ]O 2 -based laminates of approximately the same loading and of varying levels of poly(vinylidene fluoride) (PVDF) binder and acetylene black (ratio held constant) were fabricated and calendered to different porosities, with the objective to investigate performance on a volume basis. The electronic conductivity of the laminates depends strongly on the inactive material content but not significantly on porosity. Electrochemical impedance spectroscopy studies found that charge-transfer resistance with calendering varied greatly with inactive material content. When the electrode contains low levels of inactive material (2% PVDF and 1.6% carbon), calendering significantly reduced the bulk resistance of the electrode. With high levels of inactive material (8% PVDF and 6.4% carbon), charge-transfer resistance increased with increased calendering. Above a certain level, depending on the overall composition, the inactive material reduces ionic transport to the active material surface. For a plug-in hybrid electric vehicle required to go 40 miles at an average rate of 20 miles/h with a 38 kW 10 s power-pulse capability, the cell chemistry studied is energy-limited. Therefore, based on the results of this study, the cathode should be compressed to 10% porosity with a minimal amount of inactive material.
95 citations
TL;DR: The results indicate that 1-Alkyl-3-methylimidazolium bromide with longer alkyl length have toxic effects on the green algae, and the risk to aquatic ecosystems by ionic liquid's leaking into the water body must be evaluated in the future.
93 citations
TL;DR: In this article, the binodal curves were fitted to a four-parameter empirical equation, and the tie-lines were described by the Othmer-Tobias and Bancroft equations.
TL;DR: It is suggested that historical usage of lindane and technical DDT was the main reason for OCP residues in the sediments from both rivers and lakes, and the composition of DDTs reflected fresh inputs of dicofol mixture in this region.
TL;DR: In this article, the decay of chi(c) states into pseudoscalars was studied using a sample of 1.06 x 10(8) psi' decays collected by the BESIII detector.
Abstract: Using a sample of 1.06 x 10(8) psi' decays collected by the BESIII detector, chi(c0) and chi(c2) decays into pi(0)pi(0) and eta eta are studied. The branching fraction results are Br(chi(c0) -> pi(0)pi(0)) = (3.23 +/- 0.03 +/- 0.23 +/- 0.14) x 10(-3), Br(chi(c2) -> pi(0)pi(0)) = (8.8 +/- 0.2 +/- 0.6 +/- 0.4) x 10(-4), Br(chi(c0) -> eta eta) = (3.44 +/- 0.10 +/- 0.24 +/- 0.2) x 10(-3), and Br(chi(c2) -> eta eta) = (6.5 +/- 0.4 +/- 0.5 +/- 0.3) x 10(-4), where the uncertainties are statistical, systematic due to this measurement, and systematic due to the branching fractions of psi' -> gamma chi(cJ). The results provide information on the decay mechanism of chi(c) states into pseudoscalars.
TL;DR: In this article, it was found that aqueous solution of a hydrophilic ionic liquid (IL), 1-butyl-3-methylimidazolium dicyanamide ([C4mim][N(CN)2]), could be separated into two phases by inorganic salts such as K2HPO4 and K3PO4.
Abstract: In the present work, it was found that aqueous solution of a hydrophilic ionic liquid (IL), 1-butyl-3-methylimidazolium dicyanamide ([C4mim][N(CN)2]), could be separated into an aqueous two-phase system (ATPS) by inorganic salts such as K2HPO4 and K3PO4. The top phase is IL-rich, while the bottom phase is phosphate-rich. It was shown that 82.7%–100% bovine serum albumin (BSA) could be enriched into the top phase and almost quantitative saccharides (arabinose, glucose, sucrose, raffinose or dextran) were preferentially extracted into the bottom phase in a single-step extraction by [C4mim][N(CN)2] + K2HPO4 ATPS. The extraction efficiency of BSA from the aqueous saccharide solutions was influenced by the molecular structure of saccharides. The conductivity, dynamic light scattering (DLS) and transmission electron microscopy (TEM) were combined to investigate the microstructure of the IL-rich top phase and the possible mechanism for the selective separation. It is suggested that the formation of the IL aggregate and the IL aggregate-BSA complex plays a significant role in the separation of BSA from aqueous saccharide solutions. This is the first example for the selective separation by ILs-based ATPSs. It is expected that these findings would have potential applications in bio-analysis, separation, and IL recycle.
TL;DR: In this article, the authors examined the contribution of the left-right model to the top quark forward-backward asymmetry at the Tevatron with respect to two new physics models: the minimal supersymmetric model without parity and the third-generation enhanced left right model.
Abstract: The top quark forward-backward asymmetry ${A}_{\mathrm{FB}}^{t}$ measured at the Tevatron is above the standard model prediction by more than $2\ensuremath{\sigma}$ deviation, which might be a harbinger for new physics. In this work we examine the contribution to ${A}_{\mathrm{FB}}^{t}$ in two different new physics models: one is the minimal supersymmetric model without $R$ parity which contributes to ${A}_{\mathrm{FB}}^{t}$ via sparticle-mediated $t$ channel process $d\overline{d}\ensuremath{\rightarrow}t\overline{t}$; the other is the third-generation enhanced left-right model which contributes to ${A}_{\mathrm{FB}}^{t}$ via ${Z}^{\ensuremath{'}}$-mediated $t$ channel or $s$ channel processes. We find that in the parameter space allowed by the $t\overline{t}$ production rate and the $t\overline{t}$ invariant mass distribution at the Tevatron, the left-right model can enhance ${A}_{\mathrm{FB}}^{t}$ to within the $2\ensuremath{\sigma}$ region of the Tevatron data for the major part of the parameter space, and in optimal case ${A}_{\mathrm{FB}}^{t}$ can reach 12% which is slightly below the $1\ensuremath{\sigma}$ lower bound. For the minimal supersymmetric model without $R$ parity, only in a narrow part of the parameter space can the ${\ensuremath{\lambda}}^{\ensuremath{'}\ensuremath{'}}$ couplings enhance ${A}_{\mathrm{FB}}^{t}$ to within the $2\ensuremath{\sigma}$ region while the ${\ensuremath{\lambda}}^{\ensuremath{'}}$ couplings just produce negative contributions to worsen the fit.
TL;DR: 18SrRNA–UBC and ACTB–HK1 were found to be the two most stable reference genes for rat regenerating hepatocytes, hepatic stellate cells, Kupffer cells, biliary epithelial cells, sinusoidal endothelium cells, pit cells, dendritic cells, and oval cells, respectively, regardless of the stages of LR.
Abstract: Liver regeneration (LR) is a process during which the liver recovers its mass and function after damage due to various causes such as partial hepatectomy (PH). It involves a sequence of well-orchestrated changes in physiological and biochemical activities, especially in the gene expression profile in a variety of liver cells. In order to produce reliable gene expression of target genes in eight kinds of rat hepatic cells during LR, the determination of internal control housekeeping genes (HKGs) is required. Eight kinds of hepatic cells were first isolated from liver tissue with high purity and activity. Then quantitative real-time reverse transcription (RT)-PCR was applied to detect expression changes of six commonly used HKGs (18SrRNA, B2M, ACTB, UBC, GAPDH, and HK1) in eight types of hepatic cells isolated from regenerating liver at 0, 2, 6, 12, 24, 30, 36, 72, 120, and 168 h after PH. The amplification of the HKGs was statistically analyzed by using geNorm algorithm. Using this method, 18SrRNA-UBC, ACTB-HK1, ACTB-GADPH, B2M-ACTB, 18SrRNA-UBC, B2M-UBC, B2M-ACTB, and B2M-UBC were found to be the two most stable reference genes for rat regenerating hepatocytes, hepatic stellate cells, Kupffer cells, biliary epithelial cells, sinusoidal endothelial cells, pit cells, dendritic cells, and oval cells, respectively, regardless of the stages of LR. In conclusion, this study has laid a good foundation for investigating gene expression of target genes in different types of hepatic cells during LR.
TL;DR: In this paper, the authors extend the Reilly formula for drifting Laplacian operators and apply it to study eigenvalue estimate for drifting LPA operators on compact Riemannian manifolds' boundary.
TL;DR: In this article, the preparation and characterization of Pd nanoparticles supported on untreated multi-walled carbon nanotubes (MWCNTs), synthesized in the presence of glutamate was reported.
TL;DR: In this paper, a series of imidazole derivatives were used for density functional theory (DFT) calculations, where B3LYP and B3P86 functionals with 6-31G** basis set were used.
TL;DR: The study focuses on the analysis of the information flow among the ISI subject categories and aims at finding an appropriate field structure of the Web of Science using the subject clustering algorithm developed in previous studies.
TL;DR: In this article, the effects of different oxygen species and vacancies on the adsorption and oxidation of formaldehyde over CeO2(1.1) surface were systematically investigated using density functional theory (DFT) method.
TL;DR: In this paper, the strong Feller property holds for the solution of the white noise driven SPDEs with reflection, and some Harnack inequalities for the semigroup associated with the solution are established.
Abstract: In this paper, we prove that the strong Feller property holds for the solution of the white noise driven SPDEs with reflection. When the noise is additive, we establish some Harnack inequalities for the semigroup associated with the solution. As one of the applications, a Varadhan type small time asymptotics is obtained for the solution.
06 Dec 2010
TL;DR: An improved single image dehazing algorithm which based on the atmospheric scattering physics-based models is introduced, which applies the local dark channel prior on selected region to estimate the atmospheric light, and obtain more accurate result.
Abstract: Atmospheric conditions induced by suspended particles, such as fog and haze, severely degrade image quality. Haze removal from a single image of a weather-degraded scene remains a challenging task, because the haze is dependent on the unknown depth information. In this paper, we introduce an improved single image dehazing algorithm which based on the atmospheric scattering physics-based models. We apply the local dark channel prior on selected region to estimate the atmospheric light, and obtain more accurate result. Experiments on real images validate our approach.
TL;DR: In this article, the absolute branching ratio of the charmonium state h(c) (P-1(1)) with and without subsequent radiative decay was measured with BESIII at BEPCII.
Abstract: We present measurements of the charmonium state h(c) (P-1(1)) made with 106 x 10(6) psi' events collected by BESIII at BEPCII. Clear signals are observed for psi' -> pi(0)h(c) with and without the subsequent radiative decay h(c) -> gamma eta(c). First measurements of the absolute branching ratios B(psi' -> pi(0)h(c)) = (8.4 +/- 1.3 +/- 1.0 x 10(-4) and B(h(c) -> gamma eta(c)) = (54.3 +/- 6.7 +/- 5.2)% are presented. A statistics-limited determination of the previously unmeasured h(c) width leads to an upper limit Gamma(h(c)) pi(0)h(c)) x B(h(c) -> gamma eta(c)) = (4.58 +/- 0.40 +/- 0.50) x 10(-4) are consistent with previous results.
TL;DR: In this paper, an electrochemical approach to fabricating N/Zr-codoped TiO 2 nanotube arrays for photocatalytic applications was reported. But the method was not suitable for the use of a model dye, rhodamine B.
TL;DR: It is proved that the function [@J^'(x)]^[email protected]@j^''(x) is completely monotonic on (0,~) if and only if @l= 0 and [email protected]?R.
TL;DR: A robust law is established such that the reachability of the sliding surface in the state-estimation space is guaranteed, and the sufficient condition for asymptotic stability of the error system and sliding mode dynamics with disturbance attenuation level is derived via linear matrix inequality (LMI).
Abstract: The problem of H ∞ sliding mode control for uncertain time-delay systems subjected to input nonlinearity is investigated. Using the sliding mode control, a robust law is established such that the reachability of the sliding surface in the state-estimation space is guaranteed, and the sufficient condition for asymptotic stability of the error system and sliding mode dynamics with disturbance attenuation level is derived via linear matrix inequality (LMI). Finally, a simulation example is presented to verify the validity of the proposed method.
TL;DR: In this paper, aqueous poly(propylene glycol) (PPG) solution was separated into two-phase systems (ATPSs) in the presence of ionic liquid 1-allyl-3-methylimidazolium chloride (Amim]Cl), 1-butyl-3methyloramide-acetate (C4mim]Ac), or 1-Butyl 3methylamide-chloride (C 4mim) chloride (C3mim]-cl.
Abstract: In the present work, aqueous poly(propylene glycol) (PPG) solution was separated into aqueous two-phase systems (ATPSs) in the presence of ionic liquid 1-allyl-3-methylimidazolium chloride ([Amim]Cl), 1-butyl-3-methylimidazolium acetate ([C4mim]Ac), or 1-butyl-3-methylimidazolium chloride ([C4mim]Cl). The top phase was PPG-rich, whereas the bottom phase was ionic liquid (IL)-rich. Liquid−liquid equilibrium data for the ATPSs and the salting-out coefficients of the ILs have been determined at 298.15 K and atmospheric pressure. It was shown that the binodal curves and the tie-lines could be described by a three-parameter equation and the Othmer−Tobias and Bancroft equations, respectively. The salting-out ability of the ILs on PPG was found to follow the order: [Amim]Cl > [C4mim]Ac > [C4mim]Cl > [C4mim][BF4]. Since PPG is a thermo-sensitive polymer and can be recovered simply by heating, these novel ATPSs are expected to have applications in the recycling and/or enrichment of hydrophilic ILs from aqueous sol...
TL;DR: Treating the multiorbital fluctuations from ab inito LDA+Gutzwiller method, the correct FeAs bond length and bonding strength are predicted, which will explain the observed "soft phonon".
Abstract: A binary-component self-assembled monolayer (SAM) comprising tetrathiafulvalene (TTF) and n-tetradecane (n-C(14)H(30)) molecules has been investigated by a scanning tunneling microscope (STM) on a highly oriented pyrolytic graphite (HOPG) surface at room temperature. High-resolution STM images of the SAM reveal that the two different kinds of molecules spontaneously form periodic ordered strip-like phase separation structure on the HOPG substrate. The phenomenon can be qualitatively understood in terms of a phase field model, in which the interplay of three ingredients, including free energy of the binary component solution monolayer, phase boundary energy, and surface stress, is suggested to play an important role in determining the equilibrium sizes of strip-like domains of the TTF and n-C(14)H(30) in the ordered phase separation structure. In addition, scanning tunneling spectrum (STS) measurements have also been performed by operating an STM tip to locate on the individual TTF or n-C(14)H(30) molecule in the SAM on the HOPG substrate. The STS at the TTF molecule shows a distinct rectifying behavior, while at the n-C(14)H(30) molecule it shows an intrinsic small current increase with the change of bias voltage and a slight asymmetry.
TL;DR: The results of spectroscopic measurements suggested that NRF have a strong ability to quench the intrinsic fluorescence of trypsin through static quenching procedure, which was consistent with the results of molecular docking and accessible surface area calculations.