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Now showing items 49 - 64 of 230

  • Ab Initio Potential Energy Surfaces for the Ground (X?\r 1\r A′) and Excited (A?\r 1\r A′′) Electronic States of HGeBr and the Absorption and Emission Spectra of HGeBr/DGeBr\r ?

    Lin, Sen   Xie, Daiqian   Guo, Hua  

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  • Stabilizing High Metal Loadings of Thermally Stable Platinum Single Atoms on an Industrial Catalyst Support

    Kunwar, Deepak   Zhou, Shulan   De La Riva, Andrew   Peterson, Eric   Xiong, Haifeng   Pereira Hernandez, Xavier Isidro   Purdy, Stephen C.   ter Veen, Rik   Brongersma, Hidde H.   Miller, Jeffrey T.   Hashiguchi, Hiroki   Kovarik, Libor   Lin, Sen   Guo, Hua   Wang, Yong   Datye, Abhaya  

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  • Three-dimensional electroelastic analysis of functionally graded piezoelectric plate via state vector approach

    Fang, Shisheng   Shindo, Yasuhide   Narita, Fumio   Lin, Sen  

    Three-dimensional electroelastic formulation is developed to study the response of functionally graded rectangular piezoelectric structures/plates. The electroelastric properties are assumed to vary linearly and nonlinearly in the thickness direction, and exact expressions for all relevant electroelastic variables are obtained through a state vector methodology. Numerical examples are presented and discussed for simply-supported bi-layer actuators with functionally graded piezoelectric layers under surface and/or internal electric potential loads. The results presented in this paper are important in the design and characterization of functionally graded piezoelectric materials in applications as microelectromechanical systems. (C) 2006 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.
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  • Bioinspired Design of Alcohol Dehydrogenase@nano TiO2 Microreactors for Sustainable Cycling of NAD(+)/NADH Coenzyme

    Lin, Sen   Sun, Shiyong   Wang, Ke   Shen, Kexuan   Ma, Biaobiao   Ren, Yuquan   Fan, Xiaoyu  

    The bioinspired design and construction of enzyme@capsule microreactors with specific cell-like functionality has generated tremendous interest in recent years. Inspired by their fascinating complexity, scientists have endeavored to understand the essential aspects of a natural cell and create biomimicking microreactors so as to immobilize enzymes within the hierarchical structure of a microcapsule. In this study, simultaneous encapsulation of alcohol dehydrogenase (ADH) was achieved during the preparation of microcapsules by the Pickering emulsion method using amphiphilic modified TiO2 nanoparticles (NPs) as building blocks for assembling the photocatalytic microcapsule membrane. The ADH@TiO2 NP microreactors exhibited dual catalytic functions, i.e., spatially confined enzymatic catalysis and the membrane-associated photocatalytic oxidation under visible light. The sustainable cycling of nicotinamide adenine dinucleotide (NAD) coenzyme between NADH and NAD(+) was realized by enzymatic regeneration of NADH from NAD(+) reduction, and was provided in a form that enabled further photocatalytic oxidation to NAD(+) under visible light. This bioinspired ADH@TiO2 NP microreactor allowed the linking of a semiconductor mineral-based inorganic photosystem to enzymatic reactions. This is a first step toward the realization of sustainable biological cycling of NAD(+)/NADH coenzyme in synthetic functional microsystems operating under visible light irradiation.
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  • Manganese vanadium oxide hollow microspheres:a novel electrocatalyst for oxygen reduction reaction

    Zhao, Liyan   Lin, Sen   Bi, Ke   Liang, Ce   Du, Yinxiao   Liu, Jun   Yang, Hujiang   Fan, Dongyu   Wang, Yonggang   Lei, Ming  

    The development of nonprecious catalysts with high electrocatalytic activities for the oxygen reduction reaction (ORR) has attracted considerable attention. In this work, we report a facile route for the synthesis of electrocatalytic manganese vanadium oxide (Mn2V2O7) with a typical thortveitite (A(2)B(2)O(7)) structure for the ORR. Hollow Mn2V2O7 microspheres with diameters of 1 mu m were synthesized in two steps, which included sol-gel preprocessing and a subsequent hydrothermal process. The ORR performances of the hollow Mn2V2O7 microspheres were systematically studied in a 0.1 M KOH electrolyte using a rotating disk electrode. Results indicated that the hollow Mn2V2O7 microspheres had excellent catalytic activities towards the ORR, performing similarly to a commercial Pt/C electrocatalyst. The as-prepared catalyst also exhibited a superior durability and methanol tolerance compared to those of the commercial Pt/C catalyst, suggesting that hollow Mn2V2O7 microspheres is a promising cathode catalyst for alkaline methanol fuel cell applications.
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  • Using amine-functionalized magnetite hollow nanospheres (AMHNs) as adsorbents for heavy metal ions

    Lin, Sen   Liu, Lili   Yang, Yong   Zhang, Wei   Xu, Meng   Lin, Kuangfei  

    In this paper, the amine-functionalized magnetite hollow nanospheres (AMHNs), prepared through a facile one-pot synthesis, were used as heavy metal ion adsorbents, whose morphology and physicochemical features were exploring by transmission electron microscopy, vibrating sample magnetometer, X-ray diffraction and Fourier-transform infrared analyses. Its adsorption performances for Pb2+, Cu2+, Zn2+, Ni2+ and Cd2+ were studied in detail. The adsorption increased with the increase of initial pH value of the solution and could be obviously affected by ionic strength. Also, the adsorption kinetics and isotherms were studied. The adsorption processes for Pb2+, Cu2+, Zn2+, Ni2+ and Cd2+ could all reach equilibrium in 60 min and be described well by the Langmuir thermodynamics model. The saturated adsorption capacities for Pb2+, Cu2+, Zn2+, Ni2+ and Cd2+ were 0.66, 0.47, 0.45, 0.38 and 0.26 mmol/g, respectively. In addition, the competitive adsorption showed the AMHNs had higher affinity to Pb2+ than to other heavy metal ions.
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  • Distance-dependent varieties of microbial community structure and metabolic functions in the rhizosphere of Sedum alfredii Hance during phytoextraction of a cadmium-contaminated soil

    Yang, Wenhao   Zhang, Taoxiang   Lin, Sen   Ni, Wuzhong  

    The recovery of microbial community and activities is crucial to the remediation of contaminated soils. Distancedependent variations ofmicrobial community composition and metabolic characteristics in the rhizospheric soil of hyperaccumulator during phytoextraction are poorly understood. A 12-month phytoextraction experiment with Sedum alfredii in a Cd-contaminated soil was conducted. A prestratified rhizobox was used for separating sub-layer rhizospheric (0-2, 2-4, 4-6, 6-8, 8-10 mm from the root mat)/bulk soils. Soil microbial structure and function were analyzed by phospholipid fatty acid (PLFA) and MicroResp T methods. The concentrations of total and specified PLFA biomarkers and the utilization rates for the 14 substrates (organic carbon) in the 0-2-mm sub-layer rhizospheric soil were significantly increased, as well as decreased with the increase in the distance from the root mat. Microbial structure measured by the ratios of different groups of PLFAs such as fungal/bacterial, monounsaturated/saturated, ratios of Gram-positive to Gram-negative (GP/GN) bacterial, and cyclopropyl/monoenoic precursors and 19:0 cyclo/18:1 omega 7c were significantly changed in the 0-2-mm soil. The PLFA contents and substrate utilization rates were negatively correlated with pH and total, acid-soluble, and reducible fractions of Cd, while positively correlated with labile carbon. The dynamics of microbial community were likely due to root exudates and Cd uptake by S. alfredii. This study revealed the stimulations and gradient changes of rhizosphere microbial community through phytoextraction, as reduced Cd concentration, pH, and increased labile carbons are due to the microbial community responses.
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  • [IEEE 2016 9th International Congress on Image and Signal Processing, BioMedical Engineering and Informatics (CISP-BMEI) - Datong, China (2016.10.15-2016.10.17)] 2016 9th International Congress on Image and Signal Processing, BioMedical Engineering and Informatics (CISP-BMEI) - Region of interest extraction for palmprint and palm vein recognition

    Lin, Sen   Xu, Tianyang   Yin, Xinyong  

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  • HBr/H2O2-mediated formation of C-S bond with thiosulfates

    Zhang, Rongxing   Jin, Shengzhou   Wan, Yuanxing   Lin, Sen   Yan, Zhaohua  

    A novel, efficient, and green protocol to construct C-S bond has been developed via HBr/H2O2-mediated sulfenylation of styrenes and 4-hydroxycoumarins leading to unsymmetrical sulfides. Various unsymmetrical sulfides were prepared in one step with moderate to good yields using environmentally-friendly H2O2 as oxidant and HBr as catalyst. Based on the preliminary experimental results, a plausible reaction mechanism was proposed for HBr/H2O2-mediated formation of C-S bond with thiosulfates. (C) 2018 Elsevier Ltd. All rights reserved.
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  • Evaluation of Nrf2 and IGF-1 expression in benign, premalignant and malignant gastric lesions

    Wang, Hong-Bo   Zhou, Cheng-Jun   Song, Su-zhen   Chen, Peng   Xu, Wei-hua   Liu, Bin   Zhu, Kong-xi   Yu, Wei-hua   Wu, Hong-lei   Wang, Hong-juan   Lin, Sen   Guo, Jian-qiang   Qin, Cheng-yong  

    The aim of this study was to investigate the expression of Nrf2 and IGF-1 in benign, premalignant, and malignant gastric lesions, and to explore the role of Nrf2 and IGF-1 in gastric carcinoma carcinogenesis. Nrf2 and IGF-1 expression was detected in normal gastric mucosa, hyperplastic polyp, intraepithelial neoplasia, and adenocarcinoma by immunohistochemistry. There was no expression of Nrf2 and IGF-1 in normal gastric mucous membrane. With the elevation of Nrf2, IGF-1 expression, their co-expressions were highly elevated from benign proliferative lesions to malignant lesions. There were significant differences between hyperplastic polyps, intraepithelial neoplasias, and adenocarcinoma (hyperplastic polys vs. intraepithelial neoplasia: P = 0.012; hyperplastic polyps vs. adenocarcinoma: P = 0.023; and intraepithelial neoplasia vs. adenocarcinoma: P = 0.027; hyperplastic polyps vs. adenocarcinoma: P = 0.0000, respectively). Nrf2 expression and IGF-1 expression were correlated positively (r = 0.337, P = 0.037). The increased expression of Nrf2 and IGF-1 may be related to gastric carcinogenesis. Elevated Nrf2 and IGF-1 may play important roles in promoting tumor progression. (C) 2011 Published by Elsevier GmbH.
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  • Lipid levels are regionally associated with cerebral microbleeds in patients with intracerebral hemorrhage.

    Lei, Chunyan   Lin, Sen   Wu, Bo   Li, Hao   Liu, Ming   You, Chao  

    BACKGROUND: Lipid levels may be involved in intracerebral hemorrhage (ICH) etiology, which suggested that lipid levels may be associated with the etiology of microbleeds (MBs) in patients with ICH. To explore this, we examined the association between lipid levels and MBs in different cerebral regions in patients with ICH.; METHODS: Patients admitted to our hospital with ICH were consecutively and prospectively included. Demographic and clinical information were collected and analyzed according to the occurrence and location of MBs and levels of triglycerides (TGs).; RESULTS: Of the 77 patients included in our study, 63 (81.8%) were found to have MBs. Prevalence of MBs in the "deep or infratentorial" region and any region increased with increasing tercile in TG concentration; however, no such trend was observed for strictly lobar MBs. The odds ratio (OR) for occurrence of MBs in deep or infratentorial region was even higher for the third tercile relative to the first: 6.77 (95% confidence interval [CI] 1.31-34.96). The OR for occurrence of MB in any region was even higher for the third tercile relative to the first: 12.24 (95% CI 1.40-106.83). However, the OR for occurrence of deep or infratentorial region and any region in the second tercile relative to the first tercile did not reach significance. Moreover, TG levels did not appear to be associated with the occurrence of strictly lobar MBs.; CONCLUSIONS: High TGs were associated with deep or infratentorial and any MBs but not with lobar MBs. This finding may shed light on the role of lipids in MB and ICH etiology. Copyright =C2=A9 2014 National Stroke Association. Published by Elsevier Inc. All rights reserved.
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  • Methyl Formate Pathway in Methanol Steam Reforming on Copper: Density Functional Calculations

    Lin, Sen   Xie, Daiqian   Guo, Hua  

    Methyl formate has been proposed to be an intermediate in methanol steam reforming (MSR) on copper catalysts. We show here using plane-wave density functional theory that methyl formate can indeed be formed by reaction between formaldehyde and methoxyl. However, this reaction competes unfavorable with the between formaldehyde and hydroxyl, which explains why methyl formate is only observed in the absences of water. Methyl formate can be further hydrolyzed by a surface OH species to produce formic acid, which can dehydrogenate to produce CO(2). This process has a lower overall barrier, than MSR, thus consistent with the experimental observation that the steam reforming of methyl formate is faster than MSR. However, this hydrolysis process might have difficulties competing with desorption of methyl formate Which-has a small adsorption energy. Our theoretical model, which is consistent with all experimental observations related to methyl formate MSR, thus assigns a minor role for the methyl formate pathway.
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  • Ab Initio Potential Energy Surfaces for the Ground ((X)over-tilde(1)A ') and Excited ((A)over-tilde(1)A '') Electronic States of HGeBr and the Absorption and Emission Spectra of HGeBr/DGeBr

    Lin, Sen   Xie, Daiqian   Guo, Hua  

    We report global potential energy surfaces for both the ground ((X) over tilde (1)A') and the excited ((A) over tilde (1)A '') electronic states of HGeBr as well as the transition dipole moment surface between them using an internally contracted multireference configuration interaction method with the Davidson correction and an augmented correlation-consistent polarized valence quadruple-zeta basis set. Vibrational energy levels of HGeBr and DGeBr are calculated on both the ground and the excited electronic states and found in good agreement with the available experimental band origins. In addition, the (A) over tilde (1)A ''-(X) over tilde (1)A' absorption and emission spectra of the two isotopomers were obtained, and an excellent agreement with the available experimental spectra was found.
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  • Cochrane Database of Systematic Reviews (Reviews) || External counterpulsation for acute ischaemic stroke

    Lin, Sen  

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  • Hypnosis intervention for the management of pain perception during cataract surgery [Erratum]

    Chen, Xiaofan   Yuan, Rongdi   Chen, Xiao   Sun, Min   Lin, Sen   Ye, Jian   Chen, chunlin  

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  • Synthesis of Nickel-Doped Ceria Catalysts for Selective Acetylene Hydrogenation

    Riley, Christopher   De La Riva, Andrew   Zhou, Shulan   Wan, Qiang   Peterson, Eric   Artyushkova, Kateryna   Farahani, Majid   Friedrich, Holger   Lin, Sen   Guo, Hua   Burkemper, Laura   Atudorei, Nicu-Viorel   Datye, Abhaya  

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