检索结果-南通市图书馆

Chinese Chemical Letters 2014年第4期25卷 535-540页

作者： Hong-Fei Zhang Zheng-qing Ye gang Zhao Key Laboratory of Synthetic Chemistry of Natural Substances Shanghai Institute of Organic ChemistryChinese Academy of Sciences

Enantioselective synthesis of functionalized fluorinated dihydropyrano[2,3-c]pyrazoles has been achieved via a diaminocyclohexane-thiourea catalyzed cascade Michael addition and Thorpe-Ziegler type cyclization in high... 详细信息

关键词： Trifluoromethyl Pyrazoles Cyclization Organocatalysis

Facile fabrication of Fe/Zr binary MOFs for arsenic removal in water:High capacity,fast kinetics and good reusability

在线全文

学校读者我要写书评

暂无评论

Journal of Environmental Sciences 2023年第6期128卷 213-223页

作者： Qi Guo yuan Li Li-Wei Zheng Xiao-YangWei Yan Xu Yi-Wen Shen Ke-gang Zhang Chun-gang yuan Hebei Key Lab of Power Plant Flue Gas Multi-Pollutants Control Department of Environmental Science&EngineeringNorth China Electric Power UniversityBaoding 071000China Wetland Research Center for Baiyangdian Lake North China Electric Power UniversityBaoding 071000China

A water-stable bimetallic Fe/Zrmetal-organic framework[UiO-66(Fe/Zr)]for exceptional decontamination of arsenic in water was fabricated through a facile one-step *** batch adsorption experiments revealed the excellent performances with ultrafast adsorption kinetics due to the synergistic effects of two functional centers and large surface area(498.33 m^(2)/g).The absorption capacity of UiO-66(Fe/Zr)for arsenate[As(V)]and arsenite[As(III)]reached as high as 204.1 mg/g and 101.7 mg/g,*** model was suitable to describe the adsorption behaviors of arsenic on UiO-66(Fe/Zr).The fast kinetics(adsorption equilibrium in 30min,10mg/L As)and pseudo-second-ordermodel implied the strong chemisorption between arsenic ions and UiO-66(Fe/Zr),which was further confirmed by DFT theoretical *** results of FT-IR,XPS analysis and TCLP test demonstrated that arsenic was immobilized on the surface of UiO-66(Fe/Zr)through Fe/Zr-O-As bonds,and the leaching rates of the adsorbed As(III)and As(V)from the spent adsorbent were only 5.6%and 1.4%,***-66(Fe/Zr)can be regenerated for five cycles without obvious removal efficiency *** original arsenic(1.0mg/L)in lake and tapwater was effectively removed in 2.0 hr[99.0%of As(III)and 99.8%of As(V)].The bimetallic UiO-66(Fe/Zr)has great potentials in water deep purification of arsenic with fast kinetics and high capacity.

关键词： Arsenic Removal Metal-organic frameworks Bimetallic

Further Results on Overlarge Sets of Kirkman Triple Systems

在线全文

学校读者我要写书评

暂无评论

Acta Mathematica Sinica,English Series 2009年第3期25卷 419-434页

作者： Lan Dang yuan qing De KANG College of Career Technology Hebei Normal University Shijiazhuang 050031 P. R. China Institute of Mathematics Hebei Normal University Shijiazhuang 050016 P. R. China

In this paper, we introduce a new concept -- overlarge sets of generalized Kirkman systems （OLGKS）, research the relation between it and OLKTS, and obtain some new results for OLKTS. The main conclusion is： If there exist both an OLKF（6^k） and a 3-OLGKS（6^k-1,4） for all k ∈{6,7,...,40}／{8,17,21,22,25,26}, then there exists an OLKTS（v） for any v ≡ 3 （mod 6）, v ≠ 21. As well, we obtain the following result： There exists an OLKTS（6u ＋ 3） for u = 2^2n-1 - 1, 7^n, 31^n, 127^n, 4^r25^s, where n ≥ 1,r＋s≥ 1.

关键词： Kirkman frame Kirkman triple system overlarge set (2 1)-resolvable Steiner quadruplesystem

Mitochondrial replacement techniques or therapies (MRTs) to improve embryo development and to prevent mitochondrial disease transmission

在线全文

学校读者我要写书评

暂无评论

Journal of Genetics and Genomics 2017年第8期44卷 371-374页

作者： Xiang-Hong Ou qing-yuan Sun Reproductive Medicine Center The 2nd People＇s Hospital of Guangdong Province Guangzhou 510317 China State Key Laboratory of Stem Cell and Reproductive Biology Institute of Zoology Chinese Academy of Sciences Beijing I00101 China University of Chinese Academy of Sciences Beijing 100101 China

The mitochondrion which contains its own double-stranded circular DNA is a semi-independent organelle that plays critical roles in cell activity. Mitochondrial DNA （mtDNA） is maternally inherited through several mechanisms that have been proposed （Luo et al., 2013） and, if mitochondrial mutations are inherited to the offspring, it is possible to cause mitochondrial diseases such as neuropathy, cardiomyopathy, myopathy, and liver failure.

关键词： mtDNA Mitochondrial replacement techniques or therapies to improve embryo development and to prevent mitochondrial disease transmission

Computing Ground State Solution of Bose-Einstein Condensates Trapped in One-Dimensional Harmonic Potential

在线全文

学校读者我要写书评

暂无评论

Communications in Theoretical Physics 2006年第5X期46卷 873-878页

作者： yuan qing-Xin DING Guo-Hui Department of Mathematics and Physics Zhengzhou Institute of Aeronautical Industry Management Zhengzhou 450015 China Department of Physics Shanghai Jiao Tong University Shanghai 200030 China

For Bose-Einstein condensates trapped in a harmonic potential well, we present numerical results from solving the tlme-dependent nonlinear Schrolinger equation based on the Crank-Nicolson method. With this method we are able to find the ground state wave function and energy by evolving the trial initial wave function in real and imaginary time spaces, respectively. In real time space, the results are in agreement with [Phys. Rev. A 51 （1995） 4704], but the trial wave function is restricted in a very small range. On the contrary, in imaginary time space, the trial wave function can be chosen widely, moreover, the results are stable.

关键词： Bose-Einstein condensates nonlinear Schrodinger equation Crank-Nicolson method

Effect of Reinforcement Corrosion Sediment Distribution Characteristics on Concrete Damage Behavior

在线全文

学校读者我要写书评

暂无评论

Computers, Materials & Continua 2019年第3期58卷 777-793页

作者： Fenghua yuan qing Zhang Xiaozhou Xia Department of Engineering Mechanics Hohai UniversityNanjing210098China

Reinforcement corrosion directly affects the mechanical behavior of reinforced concrete *** electric corrosion test was conducted on a reinforced concrete test specimen,and a finite element model of the reinforcement corrosion damage was *** addition,the damage behavior of reinforced concrete under different corrosion sediment distribution characteristics and different corrosion rates was *** was noted that when corrosion sediments are in a“semiellipse+semicircle”distribution,the results of numerical calculation are consistent with those obtained experimentally,reflecting the damage characteristics of reinforced concrete test ***,the results showed that the distribution characteristics of corrosion sediments greatly influence the damage behavior of reinforced *** particular,when the corrosion sediments demonstrate a“semiellipse”distribution,reinforced concrete members may easily suffer from reinforcement *** the case of“semiellipse+semicircle”and“circle”distributions,the cohesive force between the reinforcements and concrete decreases:With the same corrosion rate,the damaged area expands with the increase in the number of reinforcements,which indicates a reduction in the cohesive force and thus,a reduction in the damage in the reinforcement *** paper analyzes in-depth the effects of reinforcement corrosion expansion on the concrete damage behavior,provides references for practical engineering.

关键词： Reinforced concrete corrosion damage numerical modeling chlorine salt corrosion durability.

Degenerations of rational Bézier surface with weights in the form of exponential function

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Applied Mathematics(A Journal of Chinese Universities) 2017年第2期32卷 164-182页

作者： ZHANG Yue ZHU Chun-gang GUO qing-jie School of Mathematical Sciences Dalian University of TechnologyDalian 116024China School of Mathematics and Physics Science Dalian University of TechnologyPanjin 124221China.

Rational Bezier surface is a widely used surface fitting tool in CAD. When all the weights of a rational B@zier surface go to infinity in the form of power function, the limit of surface is the regular control surface induced by some lifting function, which is called toric degenerations of rational Bezier surfaces. In this paper, we study on the degenerations of the rational Bezier surface with weights in the exponential function and indicate the difference of our result and the work of Garcia-Puente et al. Through the transformation of weights in the form of exponential function and power function, the regular control surface of rational Bezier surface with weights in the exponential function is defined, which is just the limit of the surface. Compared with the power function, the exponential function approaches infinity faster, which leads to surface with the weights in the form of exponential function degenerates faster.

关键词： rational Bezier surface weights regular control surface toric degenerations exponential function.

The role of central ion in chiral recognition by taking phenylalanine as an example

在线全文

学校读者我要写书评

暂无评论

Science China Chemistry 2009年第8期52卷 1136-1141页

作者： YU qing CAO Jie LU gang WANG ZhiXiang College of Chemistry and Chemical Engineering Chinese Academy of SciencesBeijing 100049China

Chiral recognition of phenylalanine(Phe) was achieved in the gas phase by electrospray ionization Q-TOF tandem mass *** this method,two central ions,*** and divalent copper,were used and chiral crown ether,(+)-2,3,11,12-tetracarboxylic acid-18-crown-6(18-C-6-TCA),was used as a chiral *** complexes were readily formed by electrospray ionization of a methanol/water(50/50,V/V) solution containing central ions,Phe and *** dimeric complex included proton-bound(18-C-6-TCA)(Phe)H+ and copper-bound deprotonated [Cu2+(18-C-6-TCA)(Phe)-H]+ ions were mass selected and then collided with Ar in the CID *** chiral recognition capability of these complexes was evaluated using the relative abundance of daughter ion to parent ion.A higher degree of chiral recognition ability was observed with Cu2+ compared to that of H+.Different central ions exhibited distinctive dissociation pathways and unique chiral recognition *** chiral recognition mechanism was also discussed in detail with the help of the structure of copper-bound complex predicted by theoretical calculation.

关键词： chiral crown ether chiral recognition diastereoisomer collision induced dissociation theoretical calculation

Negatons, Positons, and Complexiton Solutions of Higher Order for a Non-isospectral KdV Equation

在线全文

学校读者我要写书评

暂无评论

Communications in Theoretical Physics 2007年第3X期48卷 411-414页

作者： ZHANG yuan-yuan WANG Qi ZHANG Hong-qing Department of Applied Mathematics Dalian University of Technology Dalian 116024 China

In this paper, negatons, positons, and complexiton solutions of higher order for a non-isospectral KdV equation, the KdV equation with loss and non-uniformity terms are obtained through the bilinear Baicklund transfor... 详细信息

关键词： bilinear Backlund transformation negatons positons complexiton solutions

Assessment of the MT1-MMP expression level of different cell lines by the naked eye

在线全文

学校读者我要写书评

暂无评论

Science China(Life Sciences) 2018年第4期61卷 492-500页

作者： Xiangchun Zhang qing yuan Xueyun Gao CAS Key Laboratory for Biomedical Effects of Nanomaterials and Nanosafety Institute of High Energy Physics Chinese Academy of Sciences Beijing 100049 China Department of Chemistry and Chemical Engineering Beijing University of Technology Beijing 100124 China University of Chinese Academy of Sciences Beijing 100049 China

Membrane type 1 matrix metalloproteinase(MT1-MMP) is expressed in most tumors and is believed to play a key role in the development, invasion and metastasis of tumors. There is an urgent need to develop a simple method to detect the MT1-MMP expression level on cells. In this current study, we demonstrated a red emission Au cluster probes with the specific targeting of MT1-MMP on human dopaminergic neuroblastoma(SH-SY5 Y) cells. More importantly, utilizing the intrinsic enzyme-like activity of the Au cluster probes, the expression level of MT1-MMP on the SH-SY5 Y cells could be assessed by the naked eye without cell lysis and protein extraction process. Furthermore, SH-SY5 Y, human breast cancer(MCF-7), and human bronchial epithelial(16-HBE) cell lines with different MT1-MMP expression level could be distinguished using the Au cluster probes by the naked eye. Meanwhile, fluorescence intensity and Au count determined by inductively coupled plasma mass spectrometry(ICP-MS) were used to verify the feasibility of this simple analytical method. Our proposed method is rapid, convenient, and accurate and could be assessed by the naked eye. This visual assessment method of tumor-associated proteins has immense implications in sorting tumor cells.

关键词： Au clusters MT1-MMP catalyze tumor cells