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Self-assembled core-shell polydopamine@MXene with synergistic solar absorption capability for highly efficient solar-to-vapor generation

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Nano Research 2020年第1期13卷 255-264页

作者： Xing Zhao Xiang-Jun Zha Li-sheng tang Jun-Hong Pu Kai Ke Rui-Ying Bao Zheng-ying Liu ming-Bo Yang Wei Yang College of Polymer Science and Engineering Sichuan UniversityState Key Laboratory of Polymer Materials EngineeringChengdu610065China

As a renewable and environment-friendly technology for seawater desalination and wastewater purification,solar energy triggered steam generation is attractive to address the long-standing global water scarcity ***,practical utilization of solar energy for steam generation is severely restricted by the complex synthesis,low energy conversion efficiency,insufficient solar spectrum absorption and water extraction capability of state-of-the-art ***,for the first time,we report a facile strategy to realize hydrogen bond induced self-assembly of a polydopamine(PDA)@MXene microsphere photothermal layer for synergistically achieving wide-spectrum and highly efficient solar absorption capability(≈96%in a wide solar spectrum range of 250–1,500 nm wavelength).Moreover,such a system renders fast water transport and vapor escaping due to the intrinsically hydrophilic nature of both MXene and PDA,as well as the interspacing between core-shell *** solar-to-vapor conversion efficiencies under the solar illumination of 1 sun and 4 sun are as high as 85.2%and 93.6%,***,the PDA@MXene photothermal layer renders the system durable mechanical properties,allowing producing clean water from seawater with the salt rejection rate beyond 99%.Furthermore,stable light absorption performance can be achieved and well maintained due to the formation of ternary TiO2/C/MXene complex caused by oxidative degradation of ***,this work proposes an attractive MXene-assisted strategy for fabricating high performance photothermal composites for advanced solar-driven seawater desalination applications.

关键词： self-assembly polydopamine(PDA)@MXene microsphere synergistic light absorption solar-to-vapor generation light absorption stability

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Local Influence Analysis for Semiparametric Reproductive Dispersion Nonlinear Models

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Acta Mathematicae Applicatae Sinica 2012年第1期28卷 75-90页

作者： Xue-dong CHEN Nian-sheng tang Xue-ren WANG Department of Statistics Yunnan UniversityKunming 650091China

The present paper proposes a semiparametric reproductive dispersion nonlinear model （SRDNM） which is an extension of the nonlinear reproductive dispersion models and the semiparameter regression models. Maximum penalized likelihood estimates （MPLEs） of unknown parameters and nonparametric functions in SRDNM are presented. Assessment of local influence for various perturbation schemes are investigated. Some local influence diagnostics are given. A simulation study and a real example are used to illustrate the proposed methodologies.

关键词： local influence analysis maximum penalized likelihood estimate nonlinear reproductive dispersionmodels semiparametric regression model

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Two Dimension C_3N_4/MoS_2 Nanocomposites with Enhanced Photocatalytic Hydrogen Evolution under Visible Light Irradiation

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Journal of Wuhan University of Technology(Materials Science) 2019年第1期34卷 23-29页

作者： CUI Yanjuan YANG Chuanfeng tang sheng ZHAO Yimeng CHEN Fangyan School of Environmental and Chemical Engineering Jiangsu University of Science and Technology

MoS_2-decorated C_3N_4(C_3N_4/MoS_2) nanosheets hybrid photocatalysts were prepared by a simple sonication-impregnation method. Face-to-face lamellar heterojunctions were well established between two dimension(2D) C_3N_4 and MoS_2 nanosheets. The effects of MoS_2 content on the light absorption, charge transfer and photocatalytic activity of the hybrid samples were investigated. Characterization results show that MoS_2 nanosheets are well anchored on the face of C_3N_4 nanosheets and the composites have well dispersed layered morphology. After loading with MoS_2, the light absorption of composites was much improved, especially in visible-light region. The photocatalytic activities of C_3N_4/MoS_2 samples were evaluated based on the H_2 evolution under visible light irradiation(λ > 400 nm). When the loading amount of MoS_2 was increased to 5 wt%, the highest H_2 evolution rate(274 μmol·g^(-1)·h^(-1)) was obtained. Compared with samples obtained from direct impregnation method, sonication pretreatment is favorable for the formation of 2D layered heterojuctions and thus improve the photocatalytic activity. Slightly deactivation of C_3N_4/MoS_2 composites could be observed when recycled due to the mild photocorrosion of MoS_2. Based on the band alignments of C_3N_4 and MoS_2, a possible photocatalytic mechanism was discussed, where MoS_2 could efficiently promote the separation of the photogenerated carriers of C_3N_4.

关键词： C3N4/MoS2 nanosheet heterojunction photocatalytic activity H2 evolution

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Polarized hydroxyapatite/BaTiO_(3) scaffolds with bio-inspired porous structure for enhanced bone penetration

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Rare Metals 2022年第1期41卷 67-77页

作者： Chun-sheng Shao Liang-Jian Chen Rui-Min tang Bo Zhang Jiang-Jie tang Wei-Na Ma Department of Stomatology Third Xiangya HospitalCentral South UniversityChangsha 410013China

The porous HA/BaTiO_(3)ceramics have the potential to exhibit superior capabilities to promote bone ***,there are few reports on in vivo ***,we fabricated bio-inspired porous HA/BaTiO_(3)composites for bone repair via *** composites had a unique microstructure composed of the central canal and radically distributed lamellae,similar to the structure of nature cortical bone unite,the Haversian *** and non-polarized bio-inspired porous HA/BaTiO_(3)samples were implanted into the femoral condyle of the New Zealand *** was demonstrated that the polarization of the porous HA/BaTiO_(3)played a favorable part in bone ***,the combination between the osteoconductivity of the microstructure and augmented osteogenic cell behavior induced by charges on surfaces of polarized porous HA/BaTiO_(3)facilitated bone penetration through the *** bio-inspired porous HA/BaTiO_(3)composites are demonstrated to be promising scaffolds for bone repair.

关键词： Porous materials Freeze-casting Hydroxyapatite BaTiO_(3) Bone regeneration

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Physiological Indices and Selection of Methods on Rapid Identification for Sweet Potato Drought Resistance

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Agricultural Sciences in China 2005年第11期4卷 826-832页

作者： ZHANG ming-sheng TAN Feng ZHANG Qi-tang YANG Yong-hua School of Life Sciences Nanjing University Nanjing 210093 P.R.China School of Agronomy Guizhou University Guiyang 550025 P.R.China School of Life Sciences Southwest China Normal University Chongqing 400715 P.R.China

The relationships between the changes of relative water content （RWC）, malondialdehyde （MDA） contents, superoxide dismutase （SOD） activity and free proline contents in sweet potato leaves, and drought resistant ability under different concentration of polyethylene glycol （PEG） treatment applied at rhizosphere of sweet potato seedlings were studied. A highly positive correlation between RWC and drought resistance （r =0.783, P〈0.01）, a highly negative correlation between MDA contents and drought resistance （r = -0.848, P〈0.01）, a highly positive correlation between SOD activity and drought resistance （r = 0.777, P〈0.01） was observed. Free proline contents in leaves was not related obviously to the sweet potato drought resistance under 25% PEG treatment. The stronger the drought resistance of variety, the less decrease of RWC and increase of MDA contents, the more increase of SOD activity. By determining these physiological indices in sweet potato leaves under 25% PEG treatment, rapid identification of drought resistant ability of different varieties can be obtained in the lab.

关键词： Sweet potato Drought resistance Water stress Physiological indices Drought-resistance coefficient

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Calorific values and ash contents of different parts of Masson pine trees in southern China

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Journal of Forestry Research 2014年第4期25卷 779-786页

作者： Wei-sheng ZENG Shou-zheng tang Qian-hui XIAO Academy of Forest Inventory and Planning State Forestry Administration Research Institute of Forest Resources Information Techniques Chinese Academy of Forestry Central South Forest Inventory and Planning Institute State Forestry Administration

Calorific value of plants is an important parameter for evalu- ating and indexing material cycles and energy conversion in forest eco- systems. Based on mensuration data of 150 sample sets, we analyzed the calorific value （CV） and ash content （AC） of different parts of Masson pine （Pinus massoniana） trees in southern China using hypothesis testing and regression analysis. CV and AC of different tree parts were almost significantly different （P〈0.05）. In descending order, ash-free calorific value （AFCV） ranked as foliage 〉 branch 〉 stem bark 〉 root 〉 stem wood, and AC ranked as foliage 〉 stem bark 〉 root 〉 branch 〉 stem wood. CV and AC of stem wood from the top, middle and lower sections of trees differed significantly. CV increased from the top to the lower sections of the tnmk while AC decreased. Mean gross calorific value （GCV） and AFCV of aboveground parts were significantly higher than those of belowground parts （roots）. The mean GCV, AFCV and AC of a whole tree of Masson pine were 21.54 kJ/g, 21.74 kJ/g and 0.90%, re- spectively. CV and AC of different tree parts were, to some extent, cor- related with tree diameter, height and origin.

关键词： ash-free calorific value ash content gross calorific value hypothesis testing regression analysis Pinus massoniana

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Degradation and biological performance of porous osteomimetic biphasic calcium phosphate in vitro and in vivo

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Rare Metals 2022年第2期41卷 457-468页

作者： Chun-sheng Shao Liang-Jian Chen Rui-Min tang Bo Zhang Jiang-Jie tang Wei-Na Ma Department of Stomatology Third Xiangya HospitalCentral South UniversityChangsha 410013China

The combination between biphasic calcium phosphate(BCP)and the osteomimetic porous microstructure obtained via freeze casting is hoped to achieve excellent bone regeneration,while the effects of HA and b-TCP ratio changes on the degradation and biological performance of the BCP scaffolds with this unique microstructure need to be ***,we prepared the osteomimetic BCP scaffolds with different HA/b-TCP ratios(HA30/b-TCP70,HA50/b-TCP50,HA70/b-TCP30)and the effects of different HA/b-TCPHA/b-TCP ratios on the degradation and biological performance were studied in vitro and *** BCP scaffolds with different HA/b-TCP ratios exhibited similar microstructure,mechanical performance,and protein absorption capability,while HA70/b-TCP30 BCP scaffolds showed an advisable degradation *** in vitro confirmed the bio-compatibility and promotion on the proliferation,differentiation of MG63 cells in the porous osteomimetic BCP scaffolds with a HA/b-TCP ratio at 30:*** experiments also showed that the porous osteomimetic BCP scaffolds with a HA/b-TCP ratio at 30:70 had excellent bone regeneration capacity and proper degradation rate compatible with bone *** results reveal that the porous osteomimetic BCP scaffold with a HA/b-TCP ratio at 30:70 is a potential candidate of biodegradable bone substitutes used for bone repair.

关键词： Porous scaffolds Biphasic calcium phosphate Hydroxyapatite b-TCP Degradation

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Reduction mechanism of high-chromium vanadium–titanium magnetite pellets by H_2–CO–CO_2 gas mixtures

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International Journal of Minerals,Metallurgy and Materials 2015年第6期22卷 562-572页

作者： Jue tang Man-sheng Chu Feng Li Ya-ting tang Zheng-gen Liu Xiang-xin Xue School of Material and Metallurgy Northeastern University

The reduction of high-chromium vanadium–titanium magnetite as a typical titanomagnetite containing 0.95wt% V2O5 and 0.61wt% Cr2O3 by H2–CO–CO2 gas mixtures was investigated from 1223 to 1373 K. Both the reduction degree and reduction rate increase with increasing temperature and increasing hydrogen content. At a temperature of 1373 K, an H2/CO ratio of 5/2 by volume, and a reduction time of 40 min, the degree of reduction reaches 95%. The phase transformation during reduction is hypothesized to proceed as follows： Fe2O3 → Fe3O4 → FeO → Fe; Fe9 TiO 15 ＋ Fe2Ti3O9 → Fe2.75Ti0.25O4 → FeT iO 3 → TiO 2;（Cr0.15V0.85）2O3 → Fe2VO4; and Cr1.3Fe0.7O3 → FeC r2O4. The reduction is controlled by the mixed internal diffusion and interfacial reaction at the initial stage; however, the interfacial reaction is dominant. As the reduction proceeds, the internal diffusion becomes the controlling step.

关键词： magnetite ore reduction phase transformation reaction mechanism kinetics

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Estimation and test of restricted linear EV model with nonignorable missing covariates

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Applied Mathematics(A Journal of Chinese Universities) 2018年第3期33卷 344-358页

作者： tang Lin-jun ZHENG sheng-chao ZHOU Zhan-gong Department of Statistics Jiaxing University

This paper deals with estimation and test procedures for restricted linear errors-invariables(EV) models with nonignorable missing covariates. We develop a restricted weighted corrected least squares(WCLS) estimator based on the propensity score, which is fitted by an exponentially tilted likelihood method. The limiting distributions of the proposed estimators are discussed when tilted parameter is known or unknown. To test the validity of the constraints,we construct two test procedures based on corrected residual sum of squares and empirical likelihood method and derive their asymptotic properties. Numerical studies are conducted to examine the finite sample performance of our proposed methods.

关键词： errors-in-variables model nonignorable missing data propensity score smoothed empirical likelihood

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THE DISPLACEMENT FUNCTION OF QUASI-CONFORming ELEMENT AND ITS NODE ERROR

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Applied Mathematics and Mechanics(English Edition) 2002年第2期23卷 127-137页

作者： HE Dong-sheng(何东升) tang Li-min(唐立民) Department of Engineering Mechanics Dalian University of Technology Dalian116023 P R China Department of Engineering Mechanics Dalian University of Technology Dalian116023 P R China

Based on the strain formulation of the quasi-conforming finite element, displacement functions are constructed which have definite physical meaning, and a conclusion can be obtained that the coefficients of the constant and the linear strain are uniquely determined, and the quasi-conforming finite element method is convergent to constant strain. There are different methods for constructing the rigid displacement items, and different methods correspond to different order node errors, and this is different from ordinary displacement method finite element.

关键词： quasi-conforming element displacement function error analysis finite element method 9-parameter triangular plate element

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