检索结果-南通市图书馆

Synthesis of Cobalt Containing Block Copolymers Via Ring Opening Metathesis Polymerizastion (ROMP)

在线全文

学校读者我要写书评

暂无评论

Journal of Rare Earths 2004年第Z2期22卷 145-152页

作者： Bongjin Moon Minhyuk kang Departmen of Chemistry Sogang UniversityShinsoo-Dong 1-1Mapo-GuSeoul121-742Korea Departmen of ChemistrySogang UniversityShinsoo-Dong 1-1Mapo-GuSeoul121-742Korea

In order to realize a metal containing nano-structure, a block-copolymer containing alkynyl groups in one block was designed and synthesized by living ring opening metathesis polymerization (ROMP) technique. The newly developed bis-3-bromopyridine complex of Grubbs catalyst was employed in the series of polymerization and it yielded the desired polymers with great molecular weight control and narrow polydispersities. The characteristics of the block copolymers were investigated by gel permeation chromatography, H- and 13H- NMR spectroscopy. Complexation of the alkynyl group containing block copolymers by treatment with dicobalt octacarbonyl occurred smoothly in 5 min at room temperature. GPC analysis before and after cobalt complexation indicated a significant increase of the hydrodynamic volume. AFM images of the films before and after the complexation also showed a noticeable change in its morphology where grain sizes become smaller and more regular upon complexation.

关键词： ring opening metathesis polymerization (ROMP) metal containing block copolymer polynorbornene derivative

Facile synthesis of gold nanoplates by thermally reducing AuCl_4^- with aniline

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

Chinese Chemical Letters 2009年第2期20卷 241-244页

作者： kang Xu State Key Laboratory of Bioelectronics Southeast University Nanjing 210096 China Jiangsu Laboratory for Biomaterials and Devices Southeast University Nanjing 210096 China School of Chemistry and Chemical engineering Southeast University Nanjing 210096 China

We herein report a one-step, wet-chemical approach to synthesizing gold nanoplates in large quantities via the AuCl4^- thermal reduction process by aniline, without introducing additional capping agent or surfactant. It is found that the reduction kinetics of AuCl4^- is greatly altered by varying the initial molar ratio of aniline to AuCl4^-. Moreover, further investigation reveals that the insitu formed polyaniline could serve effectively as a capping agent to preferably adsorb the { 1 1 1 } facets of gold crystals during a slow reduction process, directing the formation of gold nanoplates.

关键词： Gold nanoplates Aniline Shape control

ANISOTROPIC POLARIZATION TENSORS FOR ELLIPSES AND ELLIPSOIDS

在线全文

学校读者我要写书评

暂无评论

Journal of Computational Mathematics 2007年第2期25卷 157-168页

作者： Hyeonbae kang Kyoungsun Kim School of Mathematical Sciences Seoul National University Seoul 151-737 Korea

In this paper we present a systematic way of computing the polarization tensors, anisotropic as well as isotropic, based on the boundary integral method. We then use this method to compute the anisotropic polarization tensor for ellipses and ellipsoids. The computation reveals the pair of anisotropy and ellipses which produce the same polarization tensors.

关键词： Anisotropic polarization tensor Integral equation Ellipsoid

Synthesis of flexible heat exchanger networks:A review

在线全文

学校读者我要写书评

暂无评论

Chinese Journal of Chemical Engineering 2019年第7期27卷 1485-1497页

作者： Lixia kang Yongzhong Liu Department of Chemical Engineering Xi’an Jiaotong UniversityXi’an 710049China Key Laboratory of Thermo-Fluid Science and Engineering Ministry of EducationXi’an 710049China

Dealing with uncertainty is one of practical issues in design and operation of heat exchanger networks(HENs),arising the problem of flexible HEN *** paper addresses the state-of-the-art methods for flexible HEN synthesis based on sensitivity analysis,resilience analysis,flexibility analysis and multiperiod synthesis techniques as *** of these methods is summarized by presenting their general procedures and recent developments on modeling,solving strategies and *** current topics related to flexible process synthesis have been briefly presented to provide several future research possibilities.

关键词： Heat exchanger network Sensitivity analysis Resilience analysis Flexibility analysis Multiperiod synthesis

A systematic strategy for multi-period heat exchanger network retrofit under multiple practical restrictions

在线全文

学校读者我要写书评

暂无评论

Chinese Journal of Chemical Engineering 2017年第8期25卷 1043-1051页

作者： Lixia kang Yongzhong Liu Department of Chemical Engineering Xi'an Jiaotong University Key Laboratory of Thermo-Fluid Science and Engineering Ministry of Education

A systematic strategy for retrofit of the multi-period heat exchanger network （HEN） on the basis of the multi- objective optimization is developed. In this three-stage procedure, a simplified multi-objective optimization model of the multi-period lIEN is first established and then solved to target the retrofit, aiming to minimizing the total annual cost and total annual CO2 emissions. The obtained Pareto front represents series of retrofit targets under different emission limitations, from which the most desirable one can be selected. The matching of the existing and the required heat exchangers is further implemented to finalize the retrofit, which will meet the practical retrofit requirements and matching restrictions. The application of the proposed procedure is illustrated through a case study of a HEN in a vacuum gas oil hydro-treating unit.

关键词： Heat exchanger network Multi-period operation CO2 emission Retrofit restrictions

Parameter estimation for rigid body after micro-Doppler removal based on L-statistics in the radar analysis

在线全文

学校读者我要写书评

暂无评论

Journal of Systems Engineering and Electronics 2015年第3期26卷 457-467页

作者： Yong Wang Jian kang School of Electronics and Information Engineering Harbin Institute of Technology

In traditional inverse synthetic aperture radar （ISAR） imaging of moving targets with rotational parts, the micro-Doppler （m-D） effects caused by the rotational parts influence the quality of the radar images. Recently, L. Stankovic proposed an m-D removal method based on L-statistics, which has been proved effective and simple. The algorithm can extract the m-D effects according to different behaviors of signals induced by rotational parts and rigid bodies in time-frequency （T-F） domain. However, by removing m-D effects, some useful short time Fourier transform （STFT） samples of rigid bodies are also extracted, which induces the side lobe problem of rigid bodies. A parameter estimation method for rigid bodies after m-D removal is proposed, which can accurately re- cover rigid bodies and avoid the side lobe problem by only using m-D removal. Simulations are given to validate the effectiveness of the proposed method.

关键词： parameter estimation L-statistics micro-Doppler (m-D) radar imaging.

Influence of V2O5 Addition on Reduction of NO by C3H6 over Pt/V2O5/Al2O3 Monolithic Catalyst

在线全文

学校读者我要写书评

暂无评论

Journal of Rare Earths 2004年第Z1期22卷 175-177页

作者： kang Shoufang Res. Ctr. for Eco-Environ. Sci. Chinese Acad. of Sci. Beijing 100085 China

Pt/V2O5/Al2O3 monolithic catalysts were prepared by wet impregnation method, and the influence of V2O5 addition on the catalytic activity for NO reduction by C3H6 under lean burn condition was investigated in detail. The results show that Pt/V2O5/Al2O3 has better activity of NO reduction than Pt/Al2O3, adding V2O5 to Pt catalyst makes the temperature window of NO reduction shift further to a lower temperature region. The activity of NO reduction decreases and there is a similar degree of deactivation over the two catalysts in the presence of SO2 in feed gas. Moreover, adding V2O5 to Pt catalyst resulted in improvement of resistance to SO2 oxidation, which decreases the emission of sulfate paniculate. Thermal aging treatment counteractes the promoting effect of V2O5 on NO reduction.

关键词： Diesel exhaust treatment NOx reduction SO2 oxidation V2O5 addition

Primality Testing for Numbers of the Form h·2~n± 1

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

Journal of Systems Science & Complexity 2019年第5期32卷 1473-1478页

作者： HUANG Dandan kang Yunling School of Software Engineering and School of Cybersecurity Jinling Institute of TechnologyNanjing 211169China School of Statistics and Mathematics Nanjing Audit UniversityNanjing 211815China.

This paper studies the problem of primality testing for numbers of the form h · 2~n± 1,where h < 2~n is odd, and n is a positive integer. The authors describe a Lucasian primality test for these numbers in certain cases, which runs in deterministic quasi-quadratic time. In particular, the authors construct a Lucasian primality test for numbers of the form 3 · 5 · 17 · 2~n± 1, where n is a positive integer, in half of the cases among the congruences of n modulo 12, by means of a Lucasian sequence with a suitable seed not depending on n. The methods of Bosma(1993), Berrizbeitia and Berry(2004), Deng and Huang(2016) can not test the primality of these numbers.

关键词： Lucasian primality test Lucasian sequence primality testing reciprocity law

Stochastic Resonance for a Time-Delayed Metapopulation System Driven by Multiplicative and Additive Noises

在线全文

学校读者我要写书评

暂无评论

Chinese Physics Letters 2013年第7期30卷 34-37页

作者： WANG kang-kang LIU Xian-Bin State Key Laboratory of Mechanics and Control of Mechanical Structures Nanjing University of Aeronautics and AstronauticsNanjing 210016 School of Mathematics and Physics Jiangsu University of Science and TechnologyZhenjiang 212003

The stochastic resonance(SR)phenomenon induced by the periodic signal in a metapopulation system which is driven by noises and contains a time delay is *** the condition of small delay time,the analytical expression of signal-to-noise ratio(SNR)is derived in the adiabatic *** numerical calculations,each effect of the additive noise intensity,the multiplicative noise intensity and the delay time upon the SNR is discussed,*** is shown that both the additive noise intensity and the multiplicative noise intensity can play a role in restraining the SR phenomenon,and for the additive noise,even a very small intensity can excite the SR *** the delay time,the different role upon the SR phenomenon is discovered finally.

关键词： delay additive multiplicative