检索结果-南通市图书馆

Synthesis of Star Polymeric Ionic Liquids and Use as the Stabilizers for High Internal Phase Emulsions

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Chinese Journal of Polymer Science 2017年第1期35卷 54-65页

作者： qi-jing chen 安泽胜 Institute of Nanochemistry and Nanobiology College of Environmental and Chemical Engineering Shanghai University Shanghai 200444 China

A series of well-defined core cross-linked star （CCS） polymeric ionic liquids （PILs） were synthesized via a three- step approach. First, the styrenic imidazole-based CCS polymer （S-PVBnIm） was prepared by the RAFT-mediated heterogeneous polymerization in a water/ethanol solution, followed by the quaternization of S-PVBnIm with bromoalkanes and anion exchange. The CCS polymers were characterized by gel permeation chromatography （GPC）, nuclear magnetic resonance （NMR） spectroscopy, Fourier transform infrared spectroscopy （FTIR）, thermal gravimetric analysis （TGA）, and differential scanning calorimetry （DSC）. The obtained CCS polymers were used as the effective emulsifiers for oil-in-water high internal phase emulsions （HIPEs）. Multiple oils with different polarity including n-dodecane, undecanol, toluene and octanol were emulsified using 0.5 wt% S-PVBnIm aqueous solution under the acidic condition to form HIPEs with long-term stabilities. The excellent emulsification properties of CCS PILs were demonstrated by HIPE formation for a variety of oils. The properties of HIPEs in terms of emulsion type and oil droplet size were characterized by the confocal laser scanning microscopy （CLSM）. The intriguing capability of CCS PILs to stabilize HIPEs of various oils holds great potentials for the practical applications.

关键词： Star polymers Poly(ionic liquids) Emulsions

A NEW WELL TEST MODEL FOR A TWO-ZONE LINEAR COMPOSITE RESERVOIR WITH VARIED THICKNESSES

在线全文

学校读者我要写书评

暂无评论

Journal of Hydrodynamics 2010年第6期22卷 804-809页

作者： ZHANG Lie-hui GUO jing-jing LIU qi-guo State Key Laboratory of Reservoir Geology and Exploitation Southwest Petroleum University Chengdu 610500China

This article presents a new well test model for two-zone linear composite reservoirs, where the rock and fluid properties as well as the formation thicknesses on both sides of the discontinuity are distinctly different. An analytical solution of pressure-transient behavior for a line-source, constant-rate well in this type of reservoir configuration is obtained with Fourier space transformation and Laplace transformation. By applying Duhamel principle, the wellbore storage and skins effects can easily be included. A set of type curves are generated and the sensitivities of the relevant parameters are discussed. A new correlating parameter MhDl√ηD is proposed to identify the pressure response in the pressure derivative curve. The model as well as the corresponding type curves are quite general that they are useful in predicting the production performance or analyzing the production data from this type of well-reservoir systems.

关键词： non-uniform thickness linear composite well test model type curve

CCAAT/enhancer binding proteins play a role in oriLyt-dependent genome replication during MHV-68 de novo infection

在线全文

学校读者我要写书评

暂无评论

Protein & Cell 2011年第6期2卷 463-469页

作者： jing qi Danyang Gong Hongyu Deng CAS Key Laboratory of Infection and Immunity Institute of BiophysicsChinese Academy of SciencesBeijing 100101China Graduate School of the Chinese Academy of Sciences Beijing 100080China

Murine gammaherpesvirus 68(MHV-68),a member of the gammaherpesvirus family,replicates robustly in permissive cell lines and is able to infect laboratory ***-68 has emerged as a model for studying the basic aspects of viral replication and host–virus interactions of its human *** genome replication is mediated through a cis-element in the viral genome called the origin of lytic replication(oriLyt).A family of transcription factors,CCAAT/enhancer binding proteins(C/EBPs),assists in oriLyt-mediated DNA replication during gammaherpesvirus *** this study,we examined the role of C/EBPs in gammaherpesvirus DNA replication during de novo infection,using MHV-68 as a *** found that C/EBP α and β bind to the CCAAT boxes in the MHV-68 oriLyt core region both in vitro and in vivo,as demonstrated by electrophoretic mobility shift assay and chromatin immunoprecipitation assay.A dominant negative form of C/EBPs significantly impaired the lytic replication efficiency of MHV-68 on both the plasmid and genome levels in a replication assay,indicating that functional C/EBPs are required for maximal MHV-68 genome DNA ***,our data demonstrate that C/EBPs interact with the oriLyt core region and play an important role in MHV-68 lytic DNA replication during de novo infection.

关键词： C/EBPs murine gammaherpesvirus 68 oriLyt lytic replication

Adaptive Distributed Inference for Multi-source Massive Heterogeneous Data

在线全文

学校读者我要写书评

暂无评论

Acta Mathematica Sinica,English Series 2024年第11期40卷 2751-2770页

作者： Xin YANG qi jing YAN Mi Xia WU School of Mathematics and Statistics Zhengzhou UniversityZhengzhou450001P.R.China School of Mathematics Statistics and MechanicsBeijing University of TechnologyBeijing100124P.R.China

In this paper,we consider the distributed inference for heterogeneous linear models with massive *** that heterogeneity may exist not only in the expectations of the subpopulations,but also in their variances,we propose the heteroscedasticity-adaptive distributed aggregation(HADA)estimation,which is shown to be communication-efficient and asymptotically optimal,regardless of homoscedasticity or ***,a distributed test for parameter heterogeneity across subpopulations is constructed based on the HADA *** finite-sample performance of the proposed methods is evaluated using simulation studies and the NYC flight data.

关键词： Distributed estimation heterogeneity Levene’s test massive heterogeneous data

A new cosmological probe using super-massive black hole shadows

在线全文

学校读者我要写书评

暂无评论

Chinese Physics C 2020年第5期44卷 119-123页

作者： jing-Zhao qi Xin Zhang Department of Physics College of SciencesNortheastern UniversityShenyang 110819China Ministry of Education’s Key Laboratory of Data Analytics and Optimization for Smart Industry Northeastern UniversityShenyang 110819China Center for High Energy Physics Peking UniversityBeijing 100080China Center for Gravitation and Cosmology Yangzhou UniversityYangzhou 225009China

We study the prospects of using the low-redshift and high-redshift black hole shadows as new cosmological standard rulers for measuring cosmological *** show that,using the low-redshift observation of the black hole shadow of M87?,the Hubble constant can be independently determined with a precision of about 13%as H0=70±9 km s?1 Mpc?*** high-redshift observations of super-massive black hole shadows may accurately determine a combination of parameters H0 andΩm,and we show by a simple simulation that combining them with the type Ia supernovae observations would give precise measurements of the cosmological parameters.

关键词： black hole shadow cosmological probe standard ruler cosmological parameters the Hubble constant

Interfacial engineering of perfluoroalkyl functionalized covalent organic framework achieved ultra-long cycled and dendrite-free lithium anodes

在线全文

学校读者我要写书评

暂无评论

Nano Research 2023年第7期16卷 9289-9298页

作者： Yongxin Yang Conghui Zhang Zhiyuan Mei Yongjiang Sun qi An qi jing Genfu Zhao Hong Guo International Joint Research Center for Advanced Energy Materials of Yunnan Province Yunnan Key Laboratory of Carbon Neutrality and Green Low-carbon TechnologiesSchool of Materials and EnergyYunnan UniversityKunming 650091China

The finite lithium-ion utilization,short cycling life,and lower capacity retention caused by irreversible dendrite growth become the maximum dilemma in lithium metal batteries’(LMBs’)***,a perfluoroalkyl-functionalized covalent organic framework(COF-F6)equipped with high stability and supernal proton conduction is introduced as an artificial solid electrolyte interface to stable the lithium metal *** from the strong electron-withdrawing effect of perfluoroalkyl,Li^(+)will be freed more by the competition of electronegative fluorine(F)and bis(trifluoromethanesulphonyl)imide anion(TFSI^(-)).The dissociation of LiTFSI and process of Li^(+)desolvation are easier to *** addition,high electronegative fluorine can also regulate local electron-cloud density to induce the fast immigration of Li^(+).All the above roles contribute to improving the Li^(+)transfer number(0.7)and achieving the goal of inhibiting Li *** a result,the perfluoroalkyl COF-F6 modified LMB presents outstanding cycling *** symmetric batteries accomplish an overlong life-span of more than 5000 h with a lower hysteresis voltage(11 mV)at 5 mA·cm^(-2).Also,no dendrites are observed when using an in-situ optical microscope to learn the process of Li ***,this dendrite-free protection tactic holds broad prospects for the practical application of Li metal anodes.

关键词： perfluoroalkyl-functionalized covalent organic framework(COF-F6) artificial solid electrolyte interface strong electronwithdrawing effect dendrite-free lithium metal anode

In-depth understanding of transport behavior of sulfided nano zerovalent iron/reduced graphene oxide@guar gum slurry: Stability and mobility

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Journal of Environmental Sciences 2024年第10期144卷 1-14页

作者： Yuheng Ma Wenhui You Zijiang Yang Zhongyu Ren qi jing Faculty of Architecture Civil and Transportation EngineeringBeijing University of TechnologyBeijing 100124China

Nanoscale zero-valent iron(NZVI),which has the advantages of small particle size,large specific surface area,and high reactivity,is often injected into contaminated aquifers in the form of ***,the prone to passivation and agglomeration as well as poor stability andmobility of NZVI limit the further application of this technology in ***,sulfided NZVI loaded on reduced graphene oxide(S-NZVI/rGO)and guar gum(GG)with shearthinning properties as stabilizers were used to synthesize S-NZVI/rGO@GG ***,TEM,and FT-IR confirmed that the dispersion and anti-passivation of NZVI were optimized in the coupled *** stability and mobility of the slurry were improved by increasing the GG concentration,enhancing the pH,and decreasing the ionic strength and the presence of Ca^(2+)ions,respectively.A modified advection-dispersion equation(ADE)was used to simulate the transport experiments considering the strain and physicochemical deposition/***,colloidal filtration theory(CFT)demonstrated that Brownian motion plays a dominant role in themigration of S-NZVI/rGO@GG slurry,and the maximummigration distance can be increased by appropriately increasing the injection ***-Derjaguin-Landau-Verwey-Overbeek(XDLVO)theory showed that the excellent stability and migration of S-NZVI/rGO@GG slurry mainly came from the GG spatial *** study has important implications for the field injection of S-NZVI/rGO@GG *** to the injection parameters,the injection range of S-NZVI/rGO@GG slurry is effectively controlled,which lays the foundation for the promotion of application in actual fields.

关键词： S-NZVI rGO Guar gum Transport Stability

A comparative investigation into floatability of bastnaesite with three di/trialkyl phosphate surfactants

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Journal of Rare Earths 2021年第11期39卷 1442-1449,I0005页

作者： Hongli Fan Xianglin Yang jing qi Guangyi Liu jingqin qin College of Chemistry and Chemical Engineering Central South UniversityChangsha 410083China

Flotation separation and recovery of rare earth minerals(REM) have returned to an important position due to the growing strategy demand for rare earth elements(REE).In this paper,a comparative investigation into the floatability of bastnaesite((Ce,La)FCO3) was conducted by using three di/trialkyl phosphate collectors,di(2-ethylhexyl) phosphate(DEHPA),dibutyl phosphate(DBP) and tributyl phosphate(TBP).The density functional theory(DFT) computation recommends that the chemical activity of the three phosphate collectors is in order of DEHPA≥ DBP >> TBP,and their hydrophobization assuggested by the IgP(oil-water partition coefficient) value is in the order of DEHPA> TBP> *** micro-flotation indicates that the preferable pH values for flotation of bastnaesite with the three phosphate collectors are 7.0-8.0,and DEHPA achieves much higher flotation recovery of bastnaesite,followed by DBP,and then TBP,which coincides with their reactivity and hydrophobicity,the two prerequisites for froth *** contact angle,zeta potential,Fourier transform infrared spectroscopy(FTIR) and X-ray photoelectron spectroscopy(XPS) deduce that DEHPA likely reacts with the Ce(Ⅲ)atoms of bastnaesite interface through its O atom(s) of the P(=O)-O-group to generate the Ce-O-P bonds,and its two 2-ethylhexyl groups orient outside for attaching bubbles,resulting in flotation enrichment of ***,this investigation offers a novel strategy for developing collectors in selective beneficiation of REM.

关键词： di(2-ethylhexyl)phosphoric acid Bastnaesite Flotation Mechanism Activity Rare earths

A Finite Volume Method Based on the Constrained Nonconforming Rotated Q_(1)-Constant Element for the Stokes Problem

在线全文

学校读者我要写书评

暂无评论

Advances in Applied Mathematics and Mechanics 2012年第1期4卷 46-71页

作者： jing qi Wanfu Tian Yonghai Li Jilin University Changchun 130012China School of Mathematics Jilin UniversityChangchun 130012China School of Science Shenyang Aerospace UniversityShenyang 110136China

We construct a finite volume element method based on the constrained nonconforming rotated Q_(1)-constant element(CNRQ_(1)-P_(0))for the Stokes *** meshes are needed,which are the primal mesh and the dual *** approximate the velocity by CNRQ_(1)elements and the pressure by piecewise *** errors for the velocity in the H^(1)norm and for the pressure in the L^(2)norm are O(h)and the error for the velocity in the L^(2)norm is O(h^(2)).Numerical experiments are presented to support our theoretical results.

关键词： Stokes problem finite volume method constrained nonconforming rotated Q_(1)element