Effect of support on the performance of Mn–Cu oxides for low temperature selective catalytic reduction of NO with NH3

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

MnOx–CuOx/TiO2 and MnOx–CuOx/Al2O3 catalysts were prepared by sol–gel method and used for low temperature selective catalytic reduction of NO with NH3. The results showed that MnOx–CuOx/TiO2 had better catalytic activity and SO2 resistance than MnOx–CuOx/Al2O3 in the temperature range of 100–250 ℃. The properties of the catalysts were characterized by using XRD, N2 adsorption, temperature programmed reduction (H2-TPR) and temperature programmed desorption (NH3-TPD). It was found that the support has a great impact on the acidity of catalyst; TiO2 and Al2O3 can promote the formation of Lewis acid sites and Bro¨ nsted acid sites respectively.

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.

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.

A practical approach for fire safety design of fire-resistant steel members

Guo-Qiang Li,Jun Ding,Y. Sakumoto 국제구조공학회 2005 Steel and Composite Structures, An International J Vol.5 No.1

Based on the test data of Nippon Steel Corporation, the formulas for calculating mechanical properties of fire-resistant (FR) steel at elevated temperatures have been established. A practical approach for fire safety design of FR steel members, including axially compressed members, flexural members and eccentrically compressed members, is developed in this paper. Compared with the full-scale specimen experiments and FEM numerical analysis, this practical approach for fire safety design of FR steel members is demonstrated to be effective and precise.

Effects of enclosures on vegetation recovery and succession in Hulunbeier steppe, China

박기형,Zhi Qiang Qu,Qin Qin Wan,Guo Dong Ding,Bin Wu 한국산림과학회 2013 Forest Science And Technology Vol.9 No.1

Hulunbeier steppe is one of the four largest grasslands in China and is renowned for its excellent natural grassland conditions. However, its natural ecosystem has been continuously disrupted due to heavy land use, excessive stock-farming, and deforestation as human activities have expanded. Exclusion of human disturbance is one of the common measures used for ecological environment restoration in Chinese desert areas. This study aims to investigate whether the duration of enclosure affects vegetation recovery and succession processes. Plant distribution, coverage and biomass were measured and described in non-enclosure, 1-year, 5-year, and 10-year enclosure plots. Vegetation succession proceeded via three stages. In the first stage, annual plant communities, such as Agriophyllum squarrosum and Corispermum stauntonii, were dominant, while in the second stage renascent arboreal herbs, mainly Cleistogenes squarrosa and Artemisia frigid, predominantly occupied the vegetation community. In the third stage, transition vegetation such as Agropyron cristatum and C. squarrosa werepredominant. Relevant government authorities in the Hulunbeier region should educate the herders regarding the apposite management of enclosure and provide incentives for compliance. Future study design should focus on effective enclosure management including grazing rate control and plantation development in enclosure.

Behavior of headed shear stud connectors subjected to cyclic loading

Fa-xing Ding,Guo-an Yin,Hai-bo Wang,Liping Wang,Qiang Guo 국제구조공학회 2017 Steel and Composite Structures, An International J Vol.25 No.6

The objective of this study is to investigate the actual behavior of studs in structures under earthquake load through laboratory tests and numerical simulation. A test program including eighteen specimens was devised with consideration of different concrete strengths and stud diameters. Six of specimens were subjected to monotonically increasing loading while the others were subjected to cyclic loading. Mechanical behavior including the failure mechanism, load-slip relationship, stiffness degradation, energy dissipation and the damage accumulation was obtained from the test results. An accurate numerical model based on the ABAQUS software was developed and validated against the test results. The results obtained from the finite element (FE) model matched well with the experimental results. Furthermore, based on the experimental and numerical data, the design formulas for expressing the skeleton curve were proposed and the simplified hysteretic model of load versus displacement was then established. It is demonstrated that the proposed formulas and simplified hysteretic model have a good match with the test results.

Case Reports : Surgical Treatment for 11 Cases of Penile Verrucous Carcinoma

( Chuan Yu Sun ),( Xu Ke ),( Zheng Jie ),( Guo Wei Xia ),( Zu Jun Fang ),( Qiang Ding ) 대한피부과학회 2011 Annals of Dermatology Vol.23 No.3s

Penile verrucous carcinoma is a rare, well-differentiated and low-grade tumor. The surgeons are deficiently aware about the biological behavior and the clinicopathological characteristic of this disease, which raises difficulties during the treatment. In our present study, the clinical and pathological data of 11 patients with penile verrucous carcinoma, aged between 49 to 85 years was retrospectively analyzed. The tumors exhibited exophytic, papillary, caulifower-like or verrucose lesions of great dimensions measuring between 2 to 10 cm on the penises. The tumors were located at glans in 6 cases, invaded the coronoid sulcus in 4 cases and invaded the shaft of the penis in 1 case. Eight cases underwent partial penectomy, while the other 3 were treated with local excision. The diagnosis of penile verrucous carcinoma was confirmed by histopathologic examination of the specimens with the negative surgical margins in all the cases. Within the period of 12 to 60 months of follow-up, all the patients were disease-free with no case of recurrence and metastasis. The novel knowledge and experience of the treatment of penile verrucous carcinoma will be a useful clinical guide for surgeons in the future. (Ann Dermatol 23(S3) S346~S349, 2011)

Synchronization for a Class of Fractional-order Linear Complex Networks via Impulsive Control

Na Liu,Jie Fang,Wei Deng,Zhen-Jun Wu,Guo-Qiang Ding 제어·로봇·시스템학회 2018 International Journal of Control, Automation, and Vol.16 No.6

Up to now, the research topic about fractional-order complex networks is mainly focused on the synchronization. In this paper, synchronization for a class of fractional-order linear complex networks is realized via impulsive control. The general expression of solution for a fractional-order impulsive error system is deduced by utilizing iteration algorithm. Some inequality conditions are established to guarantee that the largest Lyapunov exponents of each node are negative, which means that the corresponding error system is asymptotic stable and synchronization is realized. It is the first time to achieve the synchronization of fractional-order systems based on the largest Lyapunov exponent. Finally, examples are present to illustrate the validity and effectiveness of proposed conclusions. Numerical simulations also indicate that the fractional-order parameter has a great influence on the largest Lyapunov exponent, although it is not reflected in the theoretical analysis.

Chinese Patients with Gastric Cancer Need Targeted Adjuvant Chemotherapy Schemes

Shi, Wen-Tao,Wei, Lei,Xiang, Jin,Su, Ke,Ding, Qiong,Tang, Meng-Jie,Li, Ji-Qiang,Guo, Yi,Wang, Pu,Zhang, Jing-Wei Asian Pacific Journal of Cancer Prevention 2012 Asian Pacific journal of cancer prevention Vol.13 No.10

Background: Gastric cancer (GC) is one of the most common cancers in China. Adjuvant chemotherapy (AC) is a routine auxiliary treatment for GC recommended by the guidelines issued in 2011 by the Ministry of Health of the People's Republic of China, but the relevant credible consequences in China have been insufficient because of China's late start and ethical concerns. Methods: A series of databases, including Cochrane Library, MEDLINE, EMBASE, the Chinese database of the National Knowledge Infrastructure and the VIP database, were searched by 2 reviewers independently for studies investigating AC for GC through March 2012. The retrieved literature was screened according to the eligibility criteria. Results: A total of 35 randomized control trials (RCTs) were subjected to the final analysis, including 4,043 patients in treatment group and 3,884 in the control group, as well as 4 clinical-control trials (CCTs), which accessed the final analysis with 238 and 252 patients, respectively. AC reduced the risk of death as a protective treatment with statistical significance (HR=0.91, 95%CI: [0.85, 0.97], P=0.002), and it seemed more effective for Asian than non-Asian patients. The effects of AC were not influenced by the starting time (P>0.05). D2 lymphadenectomy-based chemotherapy was effective (HR=0.89, 95%CI: [0.80, 0.99], P=0.04). Oral S-1 40 mg/m2 after D2 lymphadenectomy might be a better choice for Asians with advanced GC and might result in a greater reduction of adverse events than in non-Asian patients. GRADE quality assessment determined that the strength of the evidence from foreign studies from Europe, the United States and Asian countries other than China was high, while it was moderate for Chinese studies. Conclusion: AC was effective or even curative in Chinese patients in general, although it is still necessary to optimize a targeted AC scheme for Chinese patients with GC.

Targeting Bcr–Abl by combining allosteric with ATP-binding-site inhibitors

Zhang, Jianming,Adriá,n, Francisco J.,Jahnke, Wolfgang,Cowan-Jacob, Sandra W.,Li, Allen G.,Iacob, Roxana E.,Sim, Taebo,Powers, John,Dierks, Christine,Sun, Fangxian,Guo, Gui-Rong,Ding, Qiang,Okra Macmillan Publishers Limited. All rights reserved 2010 Nature Vol.463 No.7280

In an effort to find new pharmacological modalities to overcome resistance to ATP-binding-site inhibitors of Bcr–Abl, we recently reported the discovery of GNF-2, a selective allosteric Bcr–Abl inhibitor. Here, using solution NMR, X-ray crystallography, mutagenesis and hydrogen exchange mass spectrometry, we show that GNF-2 binds to the myristate-binding site of Abl, leading to changes in the structural dynamics of the ATP-binding site. GNF-5, an analogue of GNF-2 with improved pharmacokinetic properties, when used in combination with the ATP-competitive inhibitors imatinib or nilotinib, suppressed the emergence of resistance mutations in vitro, displayed additive inhibitory activity in biochemical and cellular assays against T315I mutant human Bcr–Abl and displayed in vivo efficacy against this recalcitrant mutant in a murine bone-marrow transplantation model. These results show that therapeutically relevant inhibition of Bcr–Abl activity can be achieved with inhibitors that bind to the myristate-binding site and that combining allosteric and ATP-competitive inhibitors can overcome resistance to either agent alone.