293 research outputs found
Data for: Leveraging social media news to predict stock index movement using RNN-Boost
No full textThis dataset is the news used for predicting Chinese Stock Index from 1 Jan 2015 to 14 Feb 2017. The dataset is used in paper: Chen, Weiling, Chai Kiat Yeo, Chiew Tong Lau, and Bu Sung Lee. “Leveraging social media news to predict stock index movement using RNN-Boost.” submitted to Data & Knowledge Engineering.training.csv includes all the news we have collected from the official accounts of Sina Weibo for prediction of CSI. mid indicates the unique id of the Weibo and uid indicates the user id of the author. It is very easy to get the full content of the Weibo using the api provided by Sina: http://open.weibo.com/wiki/2/statuses/sho
pH-dependent sulfonamides adsorption by carbon nanotubes with different surface oxygen contents
No full textThe presence of sulfonamides (SAs) in aquatic environments has drawn increasing concern in recent years, but their environmental behaviors still remain unclear. This study investigated pH (1.0-11.0) effect on sulfadimethoxine (SDM), sulfamethoxazole (SMX) and sulfathiazole (ST) adsorption by multi-walled carbon nanotubes (CNTs) with various surface oxygen contents (Co, 2.88-7.65%). The results showed that the adsorption was significantly affected by pH due to the change of SAs species. The calculated adsorption coefficients (Kd+, Kd0, and Kd-) for different SAs species (SA+, SA0, and SA-) followed the order of Kd0Kd+Kd-. The octanol-water partition coefficients (Kow(pH)) of SAs at various pHs were calculated, and changed with pH significantly. A good linear relationship between the normalized adsorption coefficient (logKoc(pH)) and logKow(pH) was observed (logKoc(pH)=a logKow(pH)+b) for SDM (n=54, R2=0.970), SMX (n=48, R2=0.973) and ST (n=48, R2=0.968) adsorption by CNTs. Moreover, both a and b decreased linearly with increasing Co. The relationship can be validated externally using adsorption data of SMX in the literature (n=46, R2=0.935). The results clearly reveal that the hydrophobic interactions are the main mechanism responsible for the pH-dependent SAs adsorption. ? 2015 Elsevier B.V.SCI(E)[email protected]
Longitudinal and Cross-sectional Reference Curves of Gross Motor Function in Children
No full textTitle: Longitudinal and Cross-sectional Reference Curves of Gross Motor Function in Children, Author: Weiling Wang, Location: ThodeReference curves are the most popular tool to monitor the time-related growth in children.
Both cross-sectional and longitudinal studies are widely used to collect the reference
samples. The methods used for constructing the reference curves and the interpretation of
the curves for longitudinal studies should be different from those for the cross-sectional
studies. However misunderstanding in constructing and interpreting the reference curves
for the cross-sectional and longitudinal studies is common, especially the concerning of
the effect of regression to the mean in the longitudinal studies. The LMS models of Cole
and Green[1,2] using penalized likelihood are considered to be the most powerful methods
to construct the reference curves for both cross-sectional and longitudinal studies. This
thesis focuses on the comparison of the conditional LMS regression approach for drawing
the median conditional centiles for longitudinal data to the conventional LMS model for
constructing the distance centiles for cross-sectional data. It describes the different
interpretations of the two approaches. The application of the two methods to a study of
Gross Motor Function is investigated in detail to illustrate the difference between them.ThesisMaster of Science (MS
Adsorption of sulfamethoxazole and 17-estradiol by carbon nanotubes/CoFe2O4composites
No full textTwo types of multi-walled carbon nanotubes (CNTs)/CoFe2O4composites were prepared using carboxylic CNTs (CNTs-C) and amino CNTs (CNTs-N) via a hydrothermal method. The adsorption of sulfamethoxazole (SMX) and 17??-estradiol (E2) by the two types of CNTs/CoFe2O4composites were investigated. Kinetic data show that film diffusion is the main rate-limiting step of SMX and E2 adsorption by the CNTs-N/CoFe2O4composites, whereas both liquid film diffusion and intra-particle diffusion are the rate-limiting steps of SMX and E2 adsorption by the CNTs-C/CoFe2O4composites. The adsorption isotherms were well described by the Freundlich model. The adsorption potentials (??) of SMX on the CNTs/CoFe2O4composites were higher than those of E2, indicating the stronger interaction of SMX with the CNTs/CoFe2O4composites than E2. On the contrary, the site energy distributions (??(??)) of E2 were higher than SMX, suggesting that the CNTs/CoFe2O4composites adsorbed E2 more effectively than SMX. The SMX adsorption decreased with increasing pH from 3.1 to 10.4, whereas little change was found for E2 adsorption. This difference may be attributed to their different pKavalues. FTIR analysis suggested that, in addition to hydrophobic interactions, ??-?? electron donor-acceptor interactions may also act simultaneously. The CNTs/CoFe2O4composites could be easily separated using a simple magnetic process and thermally regenerated at 300??C. Therefore, the CNTs/CoFe2O4composites could be used as a potential adsorbent for removing organic pollutants from water. ? 2015 Elsevier B.V.SCI(E)[email protected]; [email protected]
A comparative study on aggregation/sedimentation of TiO2 nanoparticles in mono- and binary systems of fulvic acids and Fe(III)
No full textThe aggregation/sedimentation potentials of TiO2 nanoparticles were studied in mono- and binary systems of Suwannee River fulvic acids (SRFA) and Fe(III) at different pH values. SRFA adsorption significantly enhanced the stability of TiO2 nanoparticles at pH 4, 6 and 8, mainly due to the dramatic increase in negative surface charges. The presence of Fe(III) stabilized aggregation/sedimentation of TiO2 nanoparticles at pH 4 due to the increasing positive charges after Fe(III) sorption, but destabilized aggregation/sedimentation at pH 6 and 8 attributed to the bridging effect of Fe(III)-hydroxy. The formation of COO-Fe(III) complex was found in binary system of SRFA and Fe(III). Thus, the positive charges that Fe(III) imparted to nanoparticles were neutralized by SRFA. Compared with those in mono-system of Fe(III). SRFA enhanced aggregation/sedimentation at pH 4, while stabilized TiO2 nanoparticles at higher pH in binary system of SRFA and Fe(III). The sedimentation rates of TiO2 nanoparticles showed relatively lower coefficient with zeta potentials (-0.883, P < 0.01) than with hydrodynamic particle sizes (0.964, P < 0.01), due to the steric hindrance of SRFA and the bridging effect of Fe(III)-hydroxy, which was confirmed by DLVO calculation. These results have important implications for prediction of the stability and fate of nanoparticles in natural water. (C) 2011 Elsevier B.V. All rights reserved.http://gateway.webofknowledge.com/gateway/Gateway.cgi?GWVersion=2&SrcApp=PARTNER_APP&SrcAuth=LinksAMR&KeyUT=WOS:000298200400009&DestLinkType=FullRecord&DestApp=ALL_WOS&UsrCustomerID=8e1609b174ce4e31116a60747a720701Engineering, EnvironmentalEngineering, CivilEnvironmental SciencesSCI(E)EIPubMed21ARTICLE70-7919
Adsorption of 17 beta-estradiol by multi-walled carbon nanotubes in natural waters with or without aquatic colloids
No full textThe adsorption of 17 beta-estradiol (E2) by multi-walled carbon nanotubes (MWCNTs) was investigated under environmentally relevant conditions. Six different surface water samples were collected in different areas of China. The effects of aquatic colloids on E2 adsorption by MWCNTs were estimated by separating the colloids using cross-flow filtration. The results show that, in the absence of aquatic colloids, the distribution coefficient (K-d) for E2 adsorption by MWCNTs shows strong correlation with the zeta potential of the MWCNTs and the fluorescence intensities of the water samples, indicating that the binding between dissolved organic matter and E2 and the increasing negative charges of MWCNTs inhibits the E2 adsorption by MWCNTs. In the presence of aquatic colloids, the K-d values for E2 adsorption by MWCNTs are negatively affected by various factors simultaneously, including the colloid content, the intensities of two typical fluorescence peaks, total organic carbon content, conductivity, and zeta potential of MWCNTs. The binding of aquatic colloids and MWCNTs, which was shown using transmission electron microscopy images, may inhibit or promote E2 adsorption by blocking or providing the adsorption sites for E2. These two effects may counteract and result in different effects of various aquatic colloids on E2 adsorption by MWCNTs. (C) 2014 Elsevier B.V. All rights reserved.http://gateway.webofknowledge.com/gateway/Gateway.cgi?GWVersion=2&SrcApp=PARTNER_APP&SrcAuth=LinksAMR&KeyUT=WOS:000343388700022&DestLinkType=FullRecord&DestApp=ALL_WOS&UsrCustomerID=8e1609b174ce4e31116a60747a720701Engineering, EnvironmentalEngineering, ChemicalSCI(E)[email protected]
Photocatalytic degradation of 17 alpha-ethinylestradiol in mono- and binary systems of fulvic acid and Fe(III): Application of fluorescence excitation/emission matrixes
No full textExcitation/emission matrix (EEM) fluorescence spectroscopy was employed to characterize the photocatalytic degradation of 17 alpha-ethinylestradiol (EE2) in mono- and binary systems of fulvic acid (FA) and ferric ions (Fe(III)). The decrease in fluorescence intensities of two characteristic peaks of EE2, whether at the peak maxima or regional integration, could be well described by the pseudo-first-order reaction kinetics. Photocatalysis was promoted by Fe(III) at low concentrations whereas inhibited by FA. Suppression in photocatalysis was observed in binary systems of FA and Fe(III), which can be attributed to photons competition of the FA-Fe(III) complex and aggregation of TiO2 particles. The kinetics rate constants determined by EEM, with relatively lower values, had significant linear correlations (p < 0.01) with those determined by EE2 concentration quantified using HPLC-MS. The relatively lower rate constants determined by EEM imply the formation of some fluorescent intermediates. This was verified by using the model compound phenol. The blue shifts of the fluorescent peaks of EE2 implied the decrease in aromatic moieties during photocatalysis. The results indicate that the fluorescence EEM can serve as a simple but utility tool for comparing the photocatalytic degradation kinetics and structural changes of EE2 under various conditions. (C) 2013 Elsevier B.V. All rights reserved.http://gateway.webofknowledge.com/gateway/Gateway.cgi?GWVersion=2&SrcApp=PARTNER_APP&SrcAuth=LinksAMR&KeyUT=WOS:000329891900014&DestLinkType=FullRecord&DestApp=ALL_WOS&UsrCustomerID=8e1609b174ce4e31116a60747a720701Engineering, EnvironmentalEngineering, ChemicalSCI(E)[email protected]
Biodegradation of bisphenol A, 17 beta-estradiol, and 17 alpha-ethynylestradiol in river water
No full textThe degradation of bisphenol A (BPA), 17 beta-estradiol (E2), and 17 alpha-ethynylestradiol (EE2) in river water was investigated. Moreover, the effects of temperature, nutrient salts, easily degraded coexisting organic matter, and the addition of municipal wastewater, were studied. The half-lives of E2 are six days at 20 degrees C and three days at 30 degrees C in river water, respectively. BPA is degraded significantly only in river water spiked with wastewater, and the half-life is from 1 to 2 days. In contrast, EE2 was persistent under all conditions in present study. Estrone (E1), the metabolite of E2, is identified during E2 degradation.http://gateway.webofknowledge.com/gateway/Gateway.cgi?GWVersion=2&SrcApp=PARTNER_APP&SrcAuth=LinksAMR&KeyUT=WOS:000288536500019&DestLinkType=FullRecord&DestApp=ALL_WOS&UsrCustomerID=8e1609b174ce4e31116a60747a720701Environmental SciencesSCI(E)EI5ARTICLE1-3225-2364
Removal of Se(IV) and Se(VI) by MFe2O4 nanoparticles from aqueous solution
No full textSelenium (Se(IV) and Se(VI)) in wastewater is of particular concern because of its high mobility, ready bioaccumulation, and toxicities to organisms. In the present study, three types of MFe2O4 (M=Mn, Cu, Co) spinel ferrite nanoparticles (NPs) were prepared through a hydrothermal method. The removal of Se(IV) and Se(VI) by MFe2O4 NPs were investigated, and the adsorption mechanisms of Se(IV) and Se(VI) were discussed. The results showed that the adsorption capacity of Se(IV) and Se(VI) followed the order of CuFe2O4>CoFe2O4>>MnFe2O4. The adsorption capacity of Se(IV) was primarily determined by the hydroxyl group contents on the surface of MFe2O4, while the adsorption capacity of Se(VI) mainly depended on the surface charges of MFe2O4. Increasing pH led to a decrease of Se(IV) and Se(VI) adsorption. After Se(IV) adsorption, the pHPZC of MFe2O4 NPs shifted toward lower pH, indicating the formation of inner-sphere complexes. After Se(VI) adsorption, the surface charges of MFe2O4 NPs also decreased especially at pH lower than pHPZC, but the pHPZC did not altered, suggesting the formation of outer-sphere Se(VI) complexes. Attenuated total reflection flourier transformed infrared spectroscopy also revealed that inner-sphere and outer-sphere complexes formed for Se(IV) and Se(VI) adsorption by MFe2O4, respectively. The results indicate that CuFe2O4 and CoFe2O4, compared with MnFe2O4, could be promising adsorbents for Se(IV) and Se(VI) removal because of their simple synthesis process, high saturation magnetization, and excellent performance. ? 2015 Elsevier B.V.SCI(E)[email protected]; [email protected]
Controlled and sustained polymeric drug delivery systems for diabetic bone healing
No full textDiabetes involves chronic metabolic changes that can impair bone healing, including a prolonged inflammatory response after injury and changes in gene expressions of cells involved in bone healing. In this thesis, various controlled and sustained polymeric drug delivery systems were developed to enhance diabetic bone healing. First, a salicylic acid (SA)-based poly(anhydride ester) (SAPAE) that releases SA in a sustained and controlled manner was observed to mitigate local inflammation and significantly enhanced bone regeneration in diabetic rats. Second, insulin-encapsulating SAPAE microspheres were formulated to co-deliver SA and insulin, which are both active compounds for diabetic bone healing with clinically proven synergistic effects. Bulk double-emulsion and microfluidic techniques were both utilized to form the microspheres. The bulk method gives higher microsphere productivity, whereas the microfluidic method offers smaller microsphere size variance. Lastly, SAPAE porous scaffolds were formed to possess the desired SA release profile and porosity for diabetic bone healing – combining both the chemical and physical advantages. These studies centered on controlled and sustained drug delivery systems for diabetic bone healing and utilized different formulation techniques to add favorable properties to the systems. With the unique properties of controlled and sustained SA release, the combination of multiple therapeutics (insulin and SA) and the integration of chemical and physical therapeutic properties (SA release and scaffold porosity), these systems are promising treatments or co-treatments for diabetic bone healing.Ph.D.Includes bibliographical referencesby Weiling Y
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