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On spline approximation of sliced inverse regression

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Science China Mathematics 2007年第9期50卷 1289-1302页

作者： li-ping zhu Zhou YU Department of Statistics East China Normal UniversityShanghai 200062China

The dimension reduction is helpful and often necessary in exploring the nonparametric regression *** this area,Sliced inverse regression (SIR) is a promising tool to estimate the central dimension reduction (CDR) *** estimate the kernel matrix of the SIR,we herein suggest the spline approximation using the least squares *** heteroscedasticity can be incorporated well by introducing an appropriate weight *** root-n asymptotic normality can be achieved for a wide range choice of *** is essentially analogous to the kernel ***, we also propose a modified Bayes information criterion (BIC) based on the eigenvalues of the SIR *** modified BIC can be applied to any form of the SIR and other related *** methodology and some of the practical issues are illustrated through the horse mussel *** studies evidence the performance of our proposed spline approximation by comparison of the existing estimators.

关键词： asymptotic normality spline Bayes information criterion dimension reduction sliced inverse regression structural dimensionality 62H12 62J02

Fibers Make a Better life

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Chinese Journal of Polymer Science 2022年第4期40卷 331-332页

作者： li-ping zhu Shu-Guang Yang Mei-Fang zhu State Key Laboratory for Modification of Chemical Fibers&Polymer Materials College of Materials Science&EngineeringDonghua UniversityShanghai 201620China

Naturally occurring fibers,such as cotton,flax,silk,and wool have been utilized by mankind for *** silk gauze gown of Han-dynasty found in 1972 by archaeological discovery in Mawangdui Han Tomb weighs only 49 *** demonstrates the advanced silkworm cultivation,harvesting and weaving techniques in the early Han Dynasty in *** today,we are not able to replicate this silk gown with such light *** a long time.

关键词： wool harvesting silk

SUPERCRITICAL CARBON DIOXIDE ASSISTED SYNTHESIS OF AMPHIPHIliC GRAFT COPOLYMERS BASED ON POLY(STYRENE-CO-MALEIC ANHYDRIDE) WITH METHOXYL POLY(ETHYLENE GLYCOL) SIDE CHAINS

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Chinese Journal of Polymer Science 2012年第2期30卷 173-180页

作者： Jian-hua Wang li-ping zhu zhuan Yi Jian-hua li You-yi Xu Bao-ku zhu MOE Key Laboratory of Macromolecule Synthesis and Functionalization MOE Engineering Research Center of Membrane and Water Treatment TechnologyDepartment of Polymer Science and EngineeringZhejiang UniversityHangzhou 310027China

Supercritical carbon dioxide （scCO2） was used as a reaction medium in synthesizing amphiphilic graft copolymers composed of poly（styrene-co-maleic anhydride）（SMA） backbones and methoxyl poly（ethylene glycol）（MPEG） side chains via esterification. The synthesized copolymers were characterized by Fourier transform infrared spectroscopy （FTIR）, gel permeation chromatography （GPC）, IH-NMR, thermo-gravimetric analysis （TGA） and differential scanning calorimetric analysis （DSC）. The gelation phenomenon was suppressed effectively by tuning reaction conditions. The influences of scCO2 temperature and pressure on the conversion of anhydride were investigated. It was found that the highest conversion ratio occurred at 80~C under a constant pressure of 14 MPa or 26 MPa. With the increase of scCO2 pressure, the conversion ratio increased first, and then leveled off. The conversion ratio of anhydride could be controlled by regulating the reaction conditions. It was also revealed that using low molecular weight MPEG brought a high conversion ratio of anhydride.

关键词： Supercritical carbon dioxide Poly(styrene-co-maleic anhydride) Poly(ethylene glycol) Amphiphilic graftcopolymer.

Hydration mechanism of a cementitious material prepared with Si-Mn slag

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International Journal of Minerals,Metallurgy and Materials 2011年第2期18卷 234-239页

作者： Xu-fang Zhang Wen Ni Jun-yu Wu li-ping zhu Key Laboratory of the Minstry of Education of China for High-Efficient Mining and Safety of Metal Mines Ministry of Education University of Science and Technology Beijing Beijing 100083 China North China University of Water Resources and Electric Power Zhengzhou 450011 China Beijing Dongfangjianyu Institute of Concrete Science and Technology Beijing 100190 China

A cementitious material was prepared by mixing 80wt% Si-Mn slag powder, 10wt% lime, and 10wt% anhydrite. The compressive strength of mortar samples reaches 51.48 MPa after 28 d curing. The analyses of X-ray diffraction （XRD） and scanning electron microscopy （SEM） show that much ettringite is formed in the sample cured for 3 d, and C-S-H gel increases rapidly during subsequent curing. Nuclear magnetic resonance （NMR） analysis of 29Si and 27Al and infrared spectroscopy （IR） analysis show that aluminum decomposition from tetrahedral network of the slag glass and its subsequent migration and re-combination play an important role in the process of hydration and strength development of the samples.

关键词： slag cement mechanical properties nuclear magnetic resonance (NMR) hydration

Crystallization characteristics of iron-rich glass ceramics prepared from nickel slag and blast furnace slag

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International Journal of Minerals,Metallurgy and Materials 2011年第4期18卷 455-459页

作者： Zhong-jie Wang Wen Ni Ke-qing li Xiao-yan Huang li-ping zhu School of Civil and Environmental Engineering University of Science and Technology Beijing Beijing 100083 China

The crystallization process of iron-rich glass-ceramics prepared from the mixture of nickel slag（NS） and blast furnace slag（BFS） with a small amount of quartz sand was investigated.A modified melting method which was more energy-saving than the traditional methods was used to control the crystallization *** results show that the iron-rich system has much lower melting temperature,glass transition temperature（Tg）,and glass crystallization temperature（Tc）,which can result in a further energy-saving *** results also show that the system has a quick but controllable crystallization process with its peak crystallization temperature at 918°*** crystallization of augite crystals begins from the edge of the sample and invades into the whole *** crystallization process can be completed in a few minutes.A distinct boundary between the crystallized part and the non-crystallized part exists during the *** the non-crystallized part showing a black colour,some sphere-shaped augite crystals already exist in the glass matrix before samples are heated to *** the crystallized part showing a khaki colour,a compact structure is formed by augite crystals.

关键词： glass ceramics grain growth crystallization slag

Tough Poly(L-DOPA)-containing Double Network Hydrogel Beads with High Capacity of Dye Adsorption

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Chinese Journal of Polymer Science 2018年第11期36卷 1251-1261页

作者： Pei-Bin Zhang An-Qi Tang Zhang-Hui Wang Jing-Yu Lu Bao-Ku zhu li-ping zhu Ministry of Education Key Laboratory of Macromolecular Synthesis and Functionalization Department of Polymer Science and Engineering Zhejiang University

Developing a low-cost and well-recyclable adsorbent with high adsorption capacity is greatly desirable in dye wastewater treatment. Here, we demonstrate a kind of novel tough and reusable hydrogel beads with quite high capacity of dye adsorption via incorporating mussel-bioinspired poly（L-DOPA）（PDOPA） into alginate/poly（acrylamide） double network （DN） hydrogels. The synthesized PDOPA nanoaggregates were introduced into the DN hydrogels by simple one-pot mixing with the monomers prior to polymerization. The fabricated hydrogel beads exhibited high mechanical strength and good elastic recovery due to the interpenetrating Ca2＋-alginate and poly（acrylamide） networks. It was shown that the beads exhibited relatively high dye adsorption capacity compared to other adsorbents reported in literature, and the introduction of PDOPA with an appropriate amount raised the adsorption capacity. It is believed that the addition of PDOPA and the matrix of double network architecture contributed synergistically to the high adsorption capacity of hydrogel beads. Moreover, the desorption of dyes could be easily realized via rinsing in acidic water and ethanol solution. The hydrogel beads remained the high adsorption capacity even after 5 times of adsorption and desorption cycles. This tough and stable hydrogel with high adsorption capacity may have potential in treatment of dye wastewater released by textile dyeing industry.

关键词： Dye adsorption Hydrogel beads Poly(L-DOPA) Double network High strength

Poly(3-hexylthio) thiophene Field-effect Transistor Device Performance: Impact of the Content of Hexylthio Side Chain on Backbone

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Chinese Journal of Polymer Science 2024年第1期42卷 14-23,I0005页

作者： Hao-Yu liu lian-He Han ling-Wei Kong li-ping zhu Xiao-Lan Qiao Mei-Fang zhu State Key Laboratory for Modification of Chemical Fibers and Polymer Materials College of Materials Science and EngineeringDonghua UniversityShanghai 201620China School of Electronic Information and Electrical Engineering Shanghai Jiao Tong UniversityShanghai 200240China

Regioregular poly(3-hexylthio)thiopene(P3HTT) has emerged tremendous potential in organic electronic applications due to the strong noncovalent interactions from the sulfur atom linked to thiophene. However, P3HTT generally exhibits low charge mobility mostly due to poor solution processability attributed to dense arrangement of hexylthio side chain in polymer, which led to strong noncovalent interactions among sulfur atoms. To balance the nonvalent interaction and aggregation for P3HTT, herein, we systematically study the effect of hexylthio side chain content in polymer backbone on the structure and properties. A series of regioregular P3HTT-based homopolymers(P3HTT, P3HTT-50,P3HTT-33 and P3HTT-25) were prepared via Kumada catalyst transfer polycondensation method from a set of mono-, bi-, ter-and quarterthiophenes containing different contents of hexylthio side chain. The DFT calculation shows the planarity of polymers backbone could be improved through reducing the density of hexylthio side chain in polymer mainchain. And significant changes in their crystallinity, aggregation and optical properties were observed with the content of hexylthio side chain reducing. The P3HTT-33 displayed the highest field-effect transistor hole mobility of 2.83×10^(-2) cm^(2)·V^(-1)·s^(-1) resulting from a balance between the crystallinity and planarity. This study demonstrates modulating the content of hexylthio side chain in P3HTT is an effective strategy to optimize the opto-electronic properties of polymer obtaining excellent semiconductor device performance.

关键词： Conjugated polymer Polythiophene Noncovalent interaction Molecular aggregation Organic field-effect transistor

Dupilumab for Treatment of Food-Dependent, Exercise-Induced Anaphylaxis: Report of One Case

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Chinese Medical Sciences Journal 2023年第2期38卷 159-162页

作者： li-ping zhu Rui Tang Qing Wang Hong li Allergy Department Peking Union Medical College HospitalChinese Academy of Medical Sciences&Peking Union Medical CollegeBeijing 100730China

Food-dependent,exercise-induced anaphylaxis(FDEIA)is a potentially life-threatening disorder that often occurs with exercise,and patients typically have eaten a specific food within hours before disease *** disease is exceedingly rare,with a prevalence of 0.02%.No well-recognized prevention or treatment strategy has been available for FDEIA except avoiding triggers *** we report an 11-year-old boy with a history of recurrent anaphylaxis of unknown etiology more than 10 times within two *** the anaphylactic symptoms had not been controlled after traditional treatments,the patient was given subcutaneous injection of dupilumab seven times within 33 *** dupilumab treatments,the patient was exposed to culprit mushrooms plus exercises at least twice a month but without notable ***,dupilumab may improve the allergic reactions in FDEIA patients.

关键词： food-dependent,exercise-induced anaphylaxis anaphylaxis treatment food allergy mushroom allergy dupilumab

Electrical and magnetic properties of ZnNiO thin films deposited by pulse laser deposition

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Journal of Zhejiang University-Science A(Applied Physics & Engineering) 2011年第7期12卷 561-566页

作者： Jie JIANG Xue-tao WANG li-ping zhu li-qiang ZHANG Zhi-guo YANG Zhi-zhen YE State Key Laboratory of Silicon Materials Department of Materials Science and Engineering Zhejiang University Hangzhou 310027 China

ZnNiO thin films with different contents of Ni(0-10 at.%) were fabricated on quartz and Si(100) substrates by pulsed laser deposition(PLD).We measured the samples by X-ray diffraction(XRD),field-emission scanning electron microscope(FE-SEM),X-ray photoelectron spectroscopy(XPS),ultraviolet-visible spectrometer(UV-VIS),and Hall *** the Ni contents were below 3 at.%,partial Zn2+ ions were replaced by the Ni2+ ions without forming any other phases,which enhanced the conductivity of the *** the Ni contents were above 3 at.%,Ni ions were at the interstitial sites,and Ni-related clusters and defects were able to emerge in the films,resulting in a worsening of electrical and optical properties.A ferromagnetic hysteresis with a coercive force of approximately 30 Oe was observed in the ZnNiO film with a Ni content of 3 at.% at room temperature.

关键词： ZnNiO thin films Electric property Ferromagnetic Transmittance Pulsed laser deposition(PLD)