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A density functional theory study of methane activation on MgO supported NiM cluster: role of M on C–Hactivation

Frontiers of Chemical Science and Engineering 2022, Volume 16, Issue 10,   Pages 1485-1492 doi: 10.1007/s11705-022-2169-8

Abstract: Methane activation is a pivotal step in the application of natural gas converting into high-value addedThe role of M on the first C–H bond cleavage of CH4 was investigated.Doping elements of the same period in Ni cluster, such as Fe, Co and Cu, for C–H bond activation followsAs a result, Ni–Fe shows the best ability for C–H bond cleavage.Consequently, C–H bond activation demands a lower energy barrier on Ni–Pt cluster.

Keywords： CH4 dissociation     Ni–M     C–H bond activation     charge transfer    

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Effect of noble metal nanoparticle size on C–N bond cleavage performance in hydrodenitrogenation: a study

Frontiers of Chemical Science and Engineering 2023, Volume 17, Issue 12,   Pages 1986-2000 doi: 10.1007/s11705-023-2337-5

Abstract: Breakage of the C–N bond is a structure sensitive process, and the catalyst size significantly affectsOn the active metal nanoparticle scale, the role of catalyst size in C–N bond cleavage has not been clearlyResults showed a 13 times higher reaction rate for sp3-hybridized C–N bond cleavage than sp2-hybridized C–N bond cleavage, while the reaction rate tended to increase first and thenbond cleavage activity, and the step atoms are the active sites for the C–N bond cleavage.

Keywords： sp3/sp2-hybridized C–N bond     noble metal nanoparticle     catalytic active site     turnover    

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Controllable synthesis of a large TS-1 catalyst for clean epoxidation of a C=C double bond under mild

Frontiers of Chemical Science and Engineering 2023, Volume 17, Issue 6,   Pages 772-783 doi: 10.1007/s11705-022-2280-x

Abstract: preparation process, and TS-1#0.1ACh was also employed in epoxidations of different substrates containing C=C double bonds.novel, easily separable and large TS-1 catalysts for efficient and clean industrial epoxidations of C=C double bonds.

Keywords： size-controlled TS-1     crystal modifier     steam-assisted crystallization     epoxidation    

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Calculation of H2+ Structural Parameters based on Hydrogen Atomic Protonized Model

Chen Jing

Strategic Study of CAE 2004, Volume 6, Issue 11,   Pages 29-32

Abstract:

The hydrogen atomic protonized model was introduced in present paper for calculation of H2bond-length, bond-energy and force constant of hydrogen molecule

Keywords： hydrogen molecule ion     bond-length     bond-energy     force constant    

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Coronary leukocyte activation in relation to progression of coronary artery disease

A. de Vries,Arash Alipour,Erwin Birnie,Andrew Westzaan,Selvetta van Santen,Ellen van der Zwan,Anho H.

Frontiers of Medicine 2016, Volume 10, Issue 1,   Pages 85-90 doi: 10.1007/s11684-016-0435-1

Abstract:

Leukocyte activation has been linked to atherogenesis, but there is little in vivo We evaluated the predictive value for progression of coronary artery disease (CAD) of leukocyte activation

Keywords： coronary artery disease     inflammation     integrin     myeloperoxidase     leukocyte activation    

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Effect of embedment length of untreated natural fibres on the bond behaviour in cement mortar

Gudimella RAMAKRISHNA, Sriraman PRIYADHARSHINI

Frontiers of Structural and Civil Engineering 2018, Volume 12, Issue 4,   Pages 454-460 doi: 10.1007/s11709-017-0454-2

Abstract: effects of various matrices with 1:3, 1:4 and 1:5 mortars and fibre types of sisal and coir on the bondbehavior at various ages of curing, i.e., 24 h, 3 d, 7 d and 28 d.The other parameters included in the investigation are water/cement (w/c) ratio, sand gradation and embedmentThe other varying parameters such as mortar mixes, sand gradation, w/c ratio and embedded length alsoshowed significant effect on bond behaviour of sisal and coir fibre with the cement mortar mixes.

Keywords： bond strength     cement mortar     natural fibre     pullout test     type of failure    

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Analysis of the double-layer α-Si:H emitter with different doping concentrations for α-Si:H/c-Si heterojunction

Haibin HUANG,Gangyu TIAN,Tao WANG,Chao GAO,Jiren YUAN,Zhihao YUE,Lang ZHOU

Frontiers in Energy 2017, Volume 11, Issue 1,   Pages 92-95 doi: 10.1007/s11708-016-0432-8

Abstract: concentrations (DLE) have been designed and prepared for amorphous silicon/crystalline silicon (α-Si:H/c-Si) heterojunction solar cells.wavelength range, the increase of the tunneling probability of the current transport and the decrease of the activation

Keywords： double-layer emitter     α-Si:H/c-Si heterojunction solar cell     short circuit current     quantum efficiency     current-voltage-temperature    

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Modeling of alkali-silica reaction in concrete: a review

WANG, Q.C. SUN, C.H. ZHANG, D.R.J. OWEN

Frontiers of Structural and Civil Engineering 2012, Volume 6, Issue 1,   Pages 1-18 doi: 10.1007/s11709-012-0141-2

Abstract: This paper presents a comprehensive review of modeling of alkali-silica reaction (ASR) in concrete. Such modeling is essential for investigating the chemical expansion mechanism and the subsequent influence on the mechanical aspects of the material. The concept of ASR and the mechanism of expansion are first outlined, and the state-of-the-art of modeling for ASR, the focus of the paper, is then presented in detail. The modeling includes theoretical approaches, meso- and macroscopic models for ASR analysis. The theoretical approaches dealt with the chemical reaction mechanism and were used for predicting pessimum size of aggregate. Mesoscopic models have attempted to explain the mechanism of mechanical deterioration of ASR-affected concrete at material scale. The macroscopic models, chemo-mechanical coupling models, have been generally developed by combining the chemical reaction kinetics with linear or nonlinear mechanical constitutive, and were applied to reproduce and predict the long-term behavior of structures suffering from ASR. Finally, a conclusion and discussion of the modeling are given.

Keywords： alkali-silica reaction (ASR)     modeling     concrete     mesoscopic     macroscopic    

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Uncertainty propagation analysis by an extended sparse grid technique

JIA, C. JIANG, C. M. FU, B. Y. NI, C. S. WANG, M. H. PING

Frontiers of Mechanical Engineering 2019, Volume 14, Issue 1,   Pages 33-46 doi: 10.1007/s11465-018-0514-x

Abstract: In this paper, an uncertainty propagation analysis method is developed based on an extended sparse grid technique and maximum entropy principle, aiming at improving the solving accuracy of the high-order moments and hence the fitting accuracy of the probability density function (PDF) of the system response. The proposed method incorporates the extended Gauss integration into the uncertainty propagation analysis. Moreover, assisted by the Rosenblatt transformation, the various types of extended integration points are transformed into the extended Gauss-Hermite integration points, which makes the method suitable for any type of continuous distribution. Subsequently, within the sparse grid numerical integration framework, the statistical moments of the system response are obtained based on the transformed points. Furthermore, based on the maximum entropy principle, the obtained first four-order statistical moments are used to fit the PDF of the system response. Finally, three numerical examples are investigated to demonstrate the effectiveness of the proposed method, which includes two mathematical problems with explicit expressions and an engineering application with a black-box model.

Keywords： uncertainty propagation analysis     extended sparse grid     maximum entropy principle     extended Gauss integration     Rosenblatt transformation     high-order moments analysis    

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Plasma enhanced chemical vapor deposition of excellent a-Si:H passivation layers for a-Si:H/c-Si heterojunction

Lei ZHAO,Wenbin ZHANG,Jingwei CHEN,Hongwei DIAO,Qi WANG,Wenjing WANG

Frontiers in Energy 2017, Volume 11, Issue 1,   Pages 85-91 doi: 10.1007/s11708-016-0437-3

Abstract: The intrinsic a-Si:H passivation layer inserted between the doped a-Si:H layer and the c-Si substrateis very crucial for improving the performance of the a-Si:H/c-Si heterojunction (SHJ) solar cell.In this paper, intrinsic a-Si:H layers were prepared on n-type Cz c-Si substrates by 27.12 MHz PECVDThe corresponding passivation performance on c-Si was investigated by minority carrier lifetime measurementsolar cell with an efficiency of 22.25% was fabricated on the commercial 156 mm pseudo-square n-type Cz c-Si

Keywords： PECVD     high pressure and high power     a-Si:H microstructure     passivation     heterojunction solar cell    

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Liver surgery and transplantation in China: Progress and Challenges

LAU W Y, LAI E C H

Frontiers of Medicine 2007, Volume 1, Issue 1,   Pages 1-5 doi: 10.1007/s11684-007-0001-y

Abstract: From the limited but available information, we traced the history of developments of liver surgery and transplantation in China. Liver surgery first started in the late 1950s in China, and it soon flourished mainly because of the great demand in liver surgery and the emergence of a number of giants in liver surgery. We recognized and honoured the important contributions of these Chinese pioneers in portal hypertension, recurrent pyogenic cholangitis, hepatocellular carcinoma and liver transplantation.

Keywords： transplantation     pyogenic cholangitis     available information     important     hypertension    

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Generation and repair of AID-initiated DNA lesions in B lymphocytes

Zhangguo Chen,Jing H. Wang

Frontiers of Medicine 2014, Volume 8, Issue 2,   Pages 201-216 doi: 10.1007/s11684-014-0324-4

Abstract:

Activation-induced deaminase (AID) initiates the secondary antibody diversification process in B lymphocytes

Keywords： class switch recombination     somatic hypermutation     activation-induced deaminase     DNA repair     genomic instability    

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A Bayesian modeling approach to bi-directional pedestrian flows in carnival events

C. WONG, William H. K. LAM

Frontiers of Engineering Management 2017, Volume 4, Issue 4,   Pages 483-489 doi: 10.15302/J-FEM-2017023

Abstract: Bi-directional pedestrian flows are common at crosswalks, footpaths, and shopping areas. However, the properties of pedestrian movement may vary in urban areas according to the type of walking facility. In recent years, crowd movements at carnival events have attracted the attention of researchers. In contrast to pedestrian behavior in other walking facilities, pedestrians whose attention is attracted by carnival displays or activities may slow down and even stop walking. The Lunar New Year Market is a traditional carnival event in Hong Kong held annually one week before the Lunar New Year. During the said event, crowd movements can be easily identified, particularly in Victoria Park, where the largest Lunar New Year Market in Hong Kong is hosted. In this study, we conducted a video-based observational survey to collect pedestrian flow and speed data at the Victoria Park Lunar New Year Market on the eve of the Lunar New Year. Using the collected data, an extant mathematical model was calibrated to capture the relationships between the relevant macroscopic quantities, thereby providing insight into pedestrian behavior at the carnival event. Bayesian inference was employed to calibrate the model by using prior data obtained from a previous controlled experiment. Results obtained enhance our understanding of crowd behavior under different conditions at carnival events, thus facilitating the improvement of the safety and efficiency of similar events in the future.

Keywords： pedestrian flow model     bi-directional interactions     empirical studies     Bayesian inference    

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H∞ control in the frequency domain for a semi-active floor isolation system

Yundong SHI, Tracy C BECKER, Masahiro KURATA, Masayoshi NAKASHIMA

Frontiers of Structural and Civil Engineering 2013, Volume 7, Issue 3,   Pages 264-275 doi: 10.1007/s11709-013-0214-x

Abstract: A floor isolation system installed in a single floor or room in a fixed base structure is designed to protect equipment. With this configuration, the input motions to the floor isolation from the ground motions are filtered by the structure, leaving the majority of the frequency content of the input motion lower than the predominant frequency of the structure. The floor isolation system should minimize the acceleration to protect equipment; however, displacement must also be limited to save floor space, especially with long period motion. Semi-active control with an control was adopted for the floor isolation system and a new input shaping filter was developed to account for the input motion characteristics and enhance the effectiveness of the control. A series of shake table tests for a semi-active floor isolation system using rolling pendulum isolators and a magnetic-rheological damper were performed to validate the control. Passive control using an oil damper was also tested for comparison. The test results show that the control effectively reduced acceleration for short period motions with frequencies close to the predominant frequency of the structure, as well as effectively reduced displacement for long period motions with frequencies close to the natural frequency of the floor isolation system. The control algorithm proved to be more advantageous than passive control because of its capacity to adjust control strategies according to the different motion frequency characteristics.

Keywords： semi-active     floor isolation     H∞ control     MR damper     shaping filter     shaking table    

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A ruptured recurrent small bowel gastrointestinal stromal tumour causing hemoperitoneum

Eric C.H. Lai,Kam Man Chung,Stephanie H.Y. Lau,Wan Yee Lau

Frontiers of Medicine 2015, Volume 9, Issue 1,   Pages 108-111 doi: 10.1007/s11684-014-0344-0

Abstract:

Hemoperitoneum is a rare and potentially life-threatening complication of GIST. We reported a 54-year-old man who developed disseminated intra-abdominal recurrence from a previously resected gastrointestinal stromal tumour (GIST) of the small bowel, and the patient presented with hemoperitoneum. Emergent debulking surgery was performed. A high dose imatinib was prescribed. Despite the presence of residual disease, the patient was well clinically 8 months after the operation. Even though, there is no evidence to support the routine use of debulking surgery in the management of GIST. In our patient, disease progression after second line targeted therapy and the absence of alternative treatment options for spontaneous rupture and hemoperitoneum prompted us to treat the patient aggressively. Resection of the ruptured GIST was carried out for control of bleeding and to prevent recurrent bleeding in this patient with good surgical risks. During the treatment decision-making, the patient’s general condition, the risk of surgery and the extent of dissemination were taken into consideration. In this patient who presented with spontaneous rupture of a small intestinal GIST, the novel use of targeted therapy and aggressive surgical treatment produced reasonably good survival outcome.

Keywords： gastrointestinal stromal tumour     hemoperitoneum     small bowel GIST     small bowel neoplasm     imatinib    

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Title Author Date Type Operation

A density functional theory study of methane activation on MgO supported NiM cluster: role of M on C–Hactivation

Journal Article

Effect of noble metal nanoparticle size on C–N bond cleavage performance in hydrodenitrogenation: a study

Journal Article

Controllable synthesis of a large TS-1 catalyst for clean epoxidation of a C=C double bond under mild

Journal Article

Calculation of H2+ Structural Parameters based on Hydrogen Atomic Protonized Model

Chen Jing

Journal Article

Coronary leukocyte activation in relation to progression of coronary artery disease

A. de Vries,Arash Alipour,Erwin Birnie,Andrew Westzaan,Selvetta van Santen,Ellen van der Zwan,Anho H.

Journal Article

Effect of embedment length of untreated natural fibres on the bond behaviour in cement mortar

Gudimella RAMAKRISHNA, Sriraman PRIYADHARSHINI

Journal Article

Analysis of the double-layer α-Si:H emitter with different doping concentrations for α-Si:H/c-Si heterojunction

Haibin HUANG,Gangyu TIAN,Tao WANG,Chao GAO,Jiren YUAN,Zhihao YUE,Lang ZHOU

Journal Article

Modeling of alkali-silica reaction in concrete: a review

WANG, Q.C. SUN, C.H. ZHANG, D.R.J. OWEN

Journal Article

Uncertainty propagation analysis by an extended sparse grid technique

JIA, C. JIANG, C. M. FU, B. Y. NI, C. S. WANG, M. H. PING

Journal Article

Plasma enhanced chemical vapor deposition of excellent a-Si:H passivation layers for a-Si:H/c-Si heterojunction

Lei ZHAO,Wenbin ZHANG,Jingwei CHEN,Hongwei DIAO,Qi WANG,Wenjing WANG

Journal Article

Liver surgery and transplantation in China: Progress and Challenges

LAU W Y, LAI E C H

Journal Article

Generation and repair of AID-initiated DNA lesions in B lymphocytes

Zhangguo Chen,Jing H. Wang

Journal Article

A Bayesian modeling approach to bi-directional pedestrian flows in carnival events

C. WONG, William H. K. LAM

Journal Article

H∞ control in the frequency domain for a semi-active floor isolation system

Yundong SHI, Tracy C BECKER, Masahiro KURATA, Masayoshi NAKASHIMA

Journal Article

A ruptured recurrent small bowel gastrointestinal stromal tumour causing hemoperitoneum

Eric C.H. Lai,Kam Man Chung,Stephanie H.Y. Lau,Wan Yee Lau

Journal Article