Effect of Cu doping on the SCR activity of CeO2 catalyst prepared by citric acid method

Rui-Tang Guo,Wen-long Zhen,Wei-Guo Pan,Yue Zhou,Jie-nan Hong,Hong-jian Xu,Qiang Jin,Cheng-gang Ding,Shi-yi Guo 한국공업화학회 2014 Journal of Industrial and Engineering Chemistry Vol.20 No.4

CeO2–CuO catalyst prepared by citric acid method was investigated for selective catalytic reduction of NO with NH3. The activity of the CeO2 catalyst was enhanced about 8–27% in the temperature range of 125–225 ℃ at a space velocity of 28,000 h 1 by the addition of Cu. It was found that the state of Cu species had great impact on the SCR performance of CeO2–CuO catalyst. Cu2+ can enhance the low temperature activity of SCR reaction, while CuO would promote NH3 oxidation before SCR reaction at high temperature, which would cause the decrease of its high temperature SCR activity.

Effect of preparation methods on the performance of CeO2/Al2O3catalysts for selective catalytic reduction of NO with NH3

Rui-Tang Guo,Yue Zhou,Wei-Guo Pan,Jie-nan Hong,Wen-long Zhen,Qiang Jin,Cheng-gang Ding,Shi-yi Guo 한국공업화학회 2013 Journal of Industrial and Engineering Chemistry Vol.19 No.6

CeO2/Al2O3 catalysts prepared by three methods were investigated for selective reduction of NO with NH3. It was found that the catalyst prepared by the single step sol–gel method had the best SCR activity and SO2 resistance performance. From the results of BET, XRD, TPD and TPR, it can be concluded that large surface area, strong interaction, highly dispersed nano-crystalline ceria, high NH3 adsorption capacity and good redox ability might be the main reasons for the excellent performance of CeO2/Al2O3catalyst prepared by the single step sol–gel method.

형용사 유형론과 중국어 형용사의 문법적 지위

郭銳原(Rui Guo),朴恩石(번역자) 중국어문논역학회 2014 中國語文論譯叢刊 Vol.0 No.35

Guo Rui said “there has been differing opinions in terms of the grammatical nature of Chinese adjectives”. He said “the goal of this paper is to identify property words as modificative or predicative from a typological perspective”. He said “property words of 72 languages in the world are investigated according to the criteria of being marked or unmarked when functioning as attribute or predicate, and five types of grammatical nature of property words are differentiated”. He said “Chinese property words belong to the fourth type”. He said “namely Chinese property words can be classified into three types: a. predicative, b. modificative, c. both modificative and predicative”. He said “the best solution in the light of Chinese property words is to classify a. and c. as adjective, and classify c. as attributive”. He said “on the bases of the above analysis, the idea of correspondence between semantic categories and prototypes of parts of speech is suggested from the binary divergence of substance and property”. He said “the strength of degree and constancy is the main factor of coding constant property words as predicate or modifier, and the difference between languages mainly manifests in the processing of constant property words”.

Multiple Node Flip Fast-SSC Decoding Algorithm for Polar Codes Based on Node Reliability

Guo Rui,Yang Pei,Ying Na,Wang Lixin 한국인터넷정보학회 2022 KSII Transactions on Internet and Information Syst Vol.16 No.2

This paper presents a fast-simplified successive cancellation (SC) flipping (Fast-SSC-Flip) decoding algorithm for polar code. Firstly, by researching the probability distribution of the number of error bits in a node caused by channel noise in simplified-SC (SSC) decoder, a measurement criterion of node reliability is proposed. Under the guidance of the criterion, the most unreliable nodes are firstly located, then the unreliable bits are selected for flipping, so as to realize Fast-SSC-Flip decoding algorithm based on node reliability (NR-Fast-SSC-Flip). Secondly, we extended the proposed NR-Fast-SSC-Flip to multiple node (NR-Fast-SSC-Flip-ω) by considering dynamic update to measure node reliability, where ω is the order of flip-nodes set. The extended algorithm can correct the error bits in multiple nodes, and get good performance at medium and high signal-to-noise (SNR) region. Simulation results show that the proposed NR-Fast-SSC-Flip decoder can obtain 0.27dB and 0.17dB gains, respectively, compared with the traditional Fast-SSC-Flip [14] and the newly proposed two-bit-flipping Fast-SSC (Fast-SSC-2Flip-E2) [18] under the same conditions. Compared with the newly proposed partitioned Fast-SSC-Flip (PA-Fast-SSC-Flip) ( =4) [18], the proposed NR-Fast-SSC-Flip-ω (ω=2) decoder can obtain about 0.21dB gain, and the FER performance exceeds the cyclic-redundancy-check (CRC) aided SC-list (CRC-SCL) decoder (L=4).

Research on Problems of the Loss of Distributed Power Grid Switch and Heat Dissipation

Rui Guo,Liaoyi Ning,Jinyuan Liu 보안공학연구지원센터 2016 International Journal of Grid and Distributed Comp Vol.9 No.9

At present, the technology of the distributed power grid gradually become mature. The focus of the study is from controlling power quality to reducing the loss of power grid, improving the network efficiency and reducing the cost. In the link of distributed generation grid connected power generation, the loss of the switching device is an important factor affecting the efficiency of grid connection. This paper puts forward a systematic solution to this problem. Firstly, as for topology structure of grid connected controller, aiming at the research on NPC, a traditional topology which is energy-saving and low loss, we present an improved NPC topology with a more continuous flow state. At the same time for this topology, the corresponding control strategies are designed in this paper. It makes the switching device of the grid connected controller have more freedom of switch and make the system can achieve the precise control of the switch tube ,which can achieve the balance of system device lose heat so as to solve the problem of local high temperature from inverter. The system is verified by grid connected test, the power adjustable PWM strategy can be used to achieve different working states without affecting the output current of the system. Through the comparison between light and heat sensors finds that the topology and control strategy proposed in this paper are successfully completed by the new hardware topology and control strategy to achieve the loss balance of the system switching devices.

Complex Vector Analysis and Suppression of Parallel Vibration of Distributed Power Grid Connected Converter

Rui Guo,Cunxu Wang,Shu Liu,Xin Guan,Wei Gao,Shuaijie Wang,Chuan Chen 보안공학연구지원센터 2016 International Journal of Grid and Distributed Comp Vol.9 No.10

With the continuous expansion of the scale of distributed power generation,multi grid connected converters often prone to oscillation problems when parallel operation.In this paper,we study the equivalent circuit of parallel connection of multi grid connected converters , system response characteristics of voltage source and in-depth analysis of the causes of the parallel oscillation of the converters.This paper analyzes converter’s parallel complex vector model by complex vector and comes to a conclusion that power grid voltage feed-forward will produce strong coupling between converter so that cause oscillation parallel converters. In view of the above problems and the flow of the converter starting or the voltage fluctuation of the grid, we design a low feed forward method, that is to make the fundamental and the main sub components of the grid voltage forward without delay and for the relative high frequency components, the filter technology is used to attenuate, so as to achieve the maximum elimination of the feed-forward coupling between the converter, to prevent the occurrence of system oscillation. In order to verify the use of this paper, the theory of the parallel converter is applied in the field of MW level wind field. The experimental results prove the correctness of the theory.

Quantificational Measurement of China-North Korea Relations after the End of the Cold War: Changes, Characteristics, and Elicitation

( Guo Rui ),( Xiao Ke Wang ) 한국국방연구원 2013 The Korean Journal of Defense Analysis Vol.25 No.1

By conducting a quantificational measurement of China-North Korea relations from1991 to 2012, it was found that the interactions between the two nations were mainly positive. Bilateral relations between China and North Korea basically remained on a good and friendly level. However, there were several distinct fluctuations. Moreover, these fluctuations happened suddenly, and their frequency showed a rising trend. The development of China-North Korea relations requires expanding the bases of bilateral cooperation and enhancing the stability thereof. China should apply the necessary means of deterrence and active preventive measures in both the political and security areas, as well as discuss and coordinate with other relevant parties ways in which to create as soon as possible suitable mechanisms to handle any events unexpectedly arising on the Korean peninsula.

Perpendicular orientation of microdomains in PS-<i>b</i>-PMMA thin films on the PS brushed substrates

Guo, Rui,Kim, Eunhye,Gong, Jinsam,Choi, Seunghoon,Ham, Sujin,Ryu, Du Yeol Royal Society of Chemistry 2011 Soft Matter Vol.7 No.15

<P>The microdomain orientation in thin films of cylinder- and lamella-forming polystyrene-<I>block</I>-poly(methyl methacrylate) (PS-<I>b</I>-PMMA) copolymers on polystyrene (PS) brushed (or grafted) substrates was studied using scanning force microscopy (SFM) and grazing incidence small-angle X-ray scattering (GISAXS), where the grafting density (σ) of the underlying PS layers are controlled. The perpendicular orientation for cylindrical and lamellar microdomains in PS-<I>b</I>-PMMA films was found when the grafting density range of the PS brush was adjusted, which is presumably caused by the surface heterogeneity of the effective PS brush chains on the PS brushed substrates, rather than the balanced interfacial interactions. These results suggest that the homopolymer brushed substrates of the same chemical identity with one component of BCP may serve as a facile means to achieve a desired microdomain orientation of BCP films by controlling σ of the underlying polymer layers.</P> <P>Graphic Abstract</P><P>The surface heterogeneity by the effective polymer chains on the PS brushed substrates leads to the perpendicular orientation for cylindrical and lamellar microdomains in PS-<I>b</I>-PMMA films by controlling the grafting density of underlying polymer layers. <IMG SRC='http://pubs.rsc.org/services/images/RSCpubs.ePlatform.Service.FreeContent.ImageService.svc/ImageService/image/GA?id=c1sm05562c'> </P>

A Fabrication Process of High Volume Fraction of Jute Fiber/Polylactide Composites for Truck Liner

Rui-Hua Hu,임재규,Shuai Zheng,Ya-Nan Li,Guo-Hua Yang,김희규,Zhi-Guo Ma 한국정밀공학회 2012 International Journal of Precision Engineering and Vol.13 No.7

Aiming at the green manufacturing technology of automotive industry, in the past, some researchers have developed green materials—fully degradable natural fiber reinforced polylactide composites. In the researches, the natural fiber volume fraction (or weight fraction) ranges from 20% to 55%. In order to lower the cost of the composites, an effective way is to increase natural fiber volume fraction and decrease polylactide fraction. In this research, a more uniform fiber blending method is employed, and the natural fiber volume fraction is increased to 70%. The fabrication process includes two steps:felt making and hot pressed molding. Short jute fiber and short PLA fiber are blended on a fiber opening machine in terms of fiber volume fractions, 60% and 70% respectively. The mixtures are carded and needle punched to make felt. Then the felt is hot pressed at 180℃, and the jute/PLA composites are fabricated. Mechanical properties of the composites with different fiber volume fractions are investigated. Real size truck liners are successfully manufactured. The composites have very good formability and processability.

Impossible Differential Cryptanalysis on Lai-Massey Scheme

Rui Guo,Chenhui Jin 한국전자통신연구원 2014 ETRI Journal Vol.36 No.6

The Lai-Massey scheme, proposed by Vaudenay, is amodified structure in the International Data EncryptionAlgorithm cipher. A family of block ciphers, namedFOX, were built on the Lai-Massey scheme. Impossibledifferential cryptanalysis is a powerful technique used torecover the secret key of block ciphers. This paper studiesthe impossible differential cryptanalysis of the Lai-Masseyscheme with affine orthomorphism for the first time. Firstly, we prove that there always exist 4-roundimpossible differentials of a Lai-Massey cipher having abijective F-function. Such 4-round impossible differentialscan be used to help find 4-round impossible differentials ofFOX64 and FOX128. Moreover, we give some sufficientconditions to characterize the existence of 5- , 6- , and 7-round impossible differentials of Lai-Massey ciphershaving a substitution-permutation (SP) F-function, andwe observe that if Lai-Massey ciphers having an SP Ffunctionuse the same diffusion layer and orthomorphismas a FOX64, then there are indeed 5- and 6-roundimpossible differentials. These results indicate that boththe diffusion layer and orthomorphism should be chosencarefully so as to make the Lai-Massey cipher secureagainst impossible differential cryptanalysis.