Resource Type

Journal Article 1219

Conference Videos 40

Conference Information 2

Year

2024 4

2023 82

2022 108

2021 116

2020 90

2019 98

2018 79

2017 104

2016 90

2015 84

2014 34

2013 48

2012 41

2011 34

2010 41

2009 39

2008 26

2007 24

2006 20

2005 11

open ︾

Keywords

development strategy 22

China 11

2035 9

renewable energy 7

food security 6

sustainable development 6

COVID-19 5

concrete 5

technology foresight 5

Alzheimer’s disease 4

China Railway’s “Go Global” strategy 4

H2S 4

adsorption 4

energy revolution 4

epidemiology 4

finite element method 4

photocatalysis 4

syngas 4

1 3

open ︾

Search scope:

排序： Display mode:

Quantification of hydration products in cementitious materials incorporating silica nanoparticles

GOEL,S. K. BHATTACHARYYA,G. MISHRA

Frontiers of Structural and Civil Engineering 2016, Volume 10, Issue 2,   Pages 162-167 doi: 10.1007/s11709-015-0315-9

Abstract: paste to study their influence on degree of hydration, porosity and formation of different type of calcium-silicate-hydrate(C-S-H) gel.Similarly, increasing gel porosity reveals the formation of more C-S-H gel.The results show that in presence of silica nanoparticles, ~24% C-S-H (Ca/Si<1.0) forms, leading to theIn case of plain cement this type of C-S-H was completely absent at 28 days.

Keywords： degree of hydration     porosity     calcium-silicate-hydrate (C-S-H)     silica nanoparticles    

HTML PDF Collect

Modern developments related to nanotechnology and nanoengineering of concrete

Konstantin SOBOLEV

Frontiers of Structural and Civil Engineering 2016, Volume 10, Issue 2,   Pages 131-141 doi: 10.1007/s11709-016-0343-0

Abstract: This paper reports on modern developments related to nanotechnology of cement and concrete. Recent advances in instrumentation and design of advanced nano-composite materials is discussed. New technological directions and historical milestones in nanoengineering and nanomodi?cation of cement-based materials are presented. It is concluded that there is a strong potential of nanotechnology to improve the performance of cement-based materials.

Keywords： nanotechnology     cement     concrete     nanoparticle     nano-composite     nanomodification     carbon nanotubes     C-S-H gel    

HTML PDF Collect

The capture of carbon dioxide by transition metal aluminates, calcium aluminate, calcium zirconate, calciumsilicate and lithium zirconate

Ganesh TILEKAR, Kiran SHINDE, Kishor KALE, Reshma RASKAR, Abaji GAIKWAD

Frontiers of Chemical Science and Engineering 2011, Volume 5, Issue 4,   Pages 477-491 doi: 10.1007/s11705-011-1107-y

Abstract: , calcium silicate and lithium zirconate was carried out at pre- and post-combustion temperatures.Calcium zirconate captured 13.85 wt-% CO at 650°C and 2.5 atm and calcium silicate captured 14.31 wt650°C).In addition, calcium aluminate, calcium zirconate, calcium silicate and lithium zirconate adsorbentszirconate<calcium zirconate<calcium silicate.

Keywords： captured CO2     pre-combustion temperature     characterization     calcium silicate     calcium zirconate    

HTML PDF Collect

Impacts of CO2 and H2S on the risk of hydrate formation during pipeline transport of natural gas

Solomon A. Aromada, Bjørn Kvamme

Frontiers of Chemical Science and Engineering 2019, Volume 13, Issue 3,   Pages 616-627 doi: 10.1007/s11705-019-1795-2

Abstract: The impacts of CO and H S in natural gas on the maximum mole-fractions of water that can be toleratedVarying mole-fractions of CO and H S were introduced into the Troll gas, and the effects these inorganicWater tolerance decreases with increase in concentration of H S.decreases with increase in the concentration of C H like H S.H S has the most impact, it tolerates the least amount of water among the components studied.

Keywords： hydrate     hydrogen Sulphide     CO2     dew point     pipeline    

HTML PDF Collect

Microstructural and photocatalytic characterization of cement-paste sol-gel synthesized titanium dioxide

Elena CERRO-PRADA,Miguel MANSO,Vicente TORRES,Jesús SORIANO

Frontiers of Structural and Civil Engineering 2016, Volume 10, Issue 2,   Pages 189-197 doi: 10.1007/s11709-015-0326-6

Abstract: As a particular microstructural feature, TiO containing calcium silicate hydrate (C-H-S) particles areidentified as networking centers of a C-S-H gel fiber matrix.phases reveal no long range order structure, the cement paste exothermal treatment in presence of hydrateSuch new cement matrix may be twofold advantageous since it additionally promotes the formation of C-S-H

Keywords： cement composites     photocatalytic TiO2     sol-gel     C-S-H gel     microstructure    

HTML PDF Collect

Effect of a commercial dispersion of multi walled carbon nanotubes on the hydration of an oil well cementing paste

Ocar Aurelio MENDOZA REALES,William C.PEARL Jr,Maria D. M. PAIVA,CristianeR.

Frontiers of Structural and Civil Engineering 2016, Volume 10, Issue 2,   Pages 174-179 doi: 10.1007/s11709-015-0324-8

Abstract: This work studies the influence of a commercial dispersion of multi wall carbon nanotubes (MWCNT) on the hydration of a class G cement paste, at room and elevated down-hole temperatures. The MWCNT dispersion was produced with a solids concentration of 3.0 % by mass and an anionic surfactant as dispersing agent. Cement pastes with water-to-cement ratio of 0.45 and additions of solid MWCNT by mass of cement up to 0.50 % were studied. Isothermal calorimetry results showed a clear retardation of the hydration of cement caused by the surfactant contained in the MWCNT dispersion. Nevertheless, thermogravimetric evaluations showed that once the hydration reaction resumed, the retardation effect of the surfactant did not have a negative impact on the amount of hydration products precipitated. It was concluded that the commercial MWCNT dispersion presents a good potential to be applied in oil well cement pastes.

Keywords： carbon nanotubes     surfactant     retardation     combined water     C-S-H    

HTML PDF Collect

Effect of the degree of template removal from mesoporous silicate materials on their adsorption of heavy

Farouq TWAIQ,M.S. NASSER,Sagheer A. ONAIZI

Frontiers of Chemical Science and Engineering 2014, Volume 8, Issue 4,   Pages 488-497 doi: 10.1007/s11705-014-1459-1

Abstract: evaluate the adsorption of heavy oil from aqueous solutions with different oil contents over mesoporous silicateThe mesoporous silicate materials have been synthesized from tetraethylorthosilicate as a silica precursor

Keywords： heavy oil     mesoporous silicate material     kinetics     template removal     adsorption    

HTML PDF Collect

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    

HTML PDF Collect

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

S. Q. XIE, S. 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    

HTML PDF Collect

Experimental study and field application of calcium sulfoaluminate cement for rapid repair of concrete

Yanhua GUAN, Ying GAO, Renjuan SUN, Moon C. WON, Zhi GE

Frontiers of Structural and Civil Engineering 2017, Volume 11, Issue 3,   Pages 338-345 doi: 10.1007/s11709-017-0411-0

Abstract: Type III cement and Calcium Sulfoaluminate (CSA) cement are the most commonly used fast-setting hydraulic

Keywords： Calcium Sulfoaluminate (CSA) cement     Type III cement     coefficient of thermal expansion (CTE)     shrinkage    

HTML PDF Collect

Full-band error control and crack-free surface fabrication techniques for ultra-precision fly cutting of large-aperture KDP crystals

H. ZHANG, S. F. WANG, C. H. AN, J. WANG, Q. XU

Frontiers of Mechanical Engineering 2017, Volume 12, Issue 2,   Pages 193-202 doi: 10.1007/s11465-017-0448-8

Abstract:

Large-aperture potassium dihydrogen phosphate (KDP) crystals are widely used in the laser path of inertial confinement fusion (ICF) systems. The most common method of manufacturing half-meter KDP crystals is ultra-precision fly cutting. When processing KDP crystals by ultra-precision fly cutting, the dynamic characteristics of the fly cutting machine and fluctuations in the fly cutting environment are translated into surface errors at different spatial frequency bands. These machining errors should be suppressed effectively to guarantee that KDP crystals meet the full-band machining accuracy specified in the evaluation index. In this study, the anisotropic machinability of KDP crystals and the causes of typical surface errors in ultra-precision fly cutting of the material are investigated. The structures of the fly cutting machine and existing processing parameters are optimized to improve the machined surface quality. The findings are theoretically and practically important in the development of high-energy laser systems in China.

Keywords： ultra-precision fly cutting     large-aperture KDP crystals     spatial frequency     processing error    

HTML PDF Collect

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

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

Abstract: The 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    

HTML PDF Collect

Tracking of safety hazards and real-time-prediction model of safety risks on construction sites

LAM,Li Qiming,Michael C. H. YAM,David A. S. CHEW

Strategic Study of CAE 2010, Volume 12, Issue 3,   Pages 68-72

Abstract:

This paper aims to explore the tracking approach of safety hazards and real-time-prediction methods of safety risks on construction sites. A literature review of safety issues on construction sites is first conducted. Consequently, a schematic model of tracking safety hazards and real-time prediction of safety risks is formulated and the corresponding methodologies are summarized. This study would provide a possible research approach on method for tracking safety hazards and real-time prediction of safety risks, while serving as a foundation for further study by drawing researchers' attention to the precursor signals of safety hazards on construction sites.

Keywords： construction sites     safety risks     real-time prediction     precursor signals     signal detection theory    

HTML PDF Collect

Design of GPRS Data Terminal Based on S3C2410

Sun Xueyong

Strategic Study of CAE 2007, Volume 9, Issue 12,   Pages 94-96

Abstract: the hardware structure and working process of the embedded Internetconnected platform, which regards S3C2410

Keywords： GPRS；embedded Internet；S3C2410；SIM100-E    

HTML PDF Collect

Population-Based and Personalized Design of Total Knee Replacement Prosthesis for Additive Manufacturing Based on Chinese Anthropometric Data Article

C.S. Chui, K.S. Leung, J. Qin, D. Shi, P. Augat, R.M.Y. Wong, S.K.H. Chow, X.Y. Huang, C.Y.Lai, P.S.H. Yung, L. Qin, W.H. Cheung

Engineering 2021, Volume 7, Issue 3,   Pages 386-394 doi: 10.1016/j.eng.2020.02.017

Abstract:

At present, most total knee replacement (TKR) prostheses on the market are designed according to the sizes of Caucasians. However, extensive studies have indicated that human anatomies differ among different ethnicities. A number of reports have indicated that Chinese TKR patients do not match with available prostheses. In this study, computed tomography (CT) images of 52 knees of Chinese men and women were used for anthropometric measurements. Index and geometric measurements were defined and used for correlation analysis. Key parameters from the measurement results were identified. Detailed geometries of knees were measured as coordinates. A deformable three-dimensional (3D) knee model based on anatomical coordinates correlating with the identified key parameters was generated. A prosthesis was then designed according to the analyzed results. Surface matching analysis, bone resection analysis, and cadaveric trials were conducted and compared with commercial products to validate the proposed design. The femoral component designed by this study resulted in the highest accuracy (root mean square point-to-surface (RMS PS), (1.08 ± 0.20) mm) and lowest amount of resected bone volume (27 412 mm3) in comparison with two commercial knee prostheses. This study suggests a new approach for population-based patient-specific femoral prosthesis design. With a single, easily acquired dimension—namely, epicondyle width (ECW)—as input, a patient-specific femoral prosthesis can be designed according to the analyzed measured data and manufactured by additive manufacturing (AM) methods. Meanwhile, the reconstructed femoral condylar surface was compared with the femoral condylar surface in the original CT scanning data. The average RMS PS distance of the reconstructed femoral condylar surface among all data was (1.10 ± 0.18) mm, which is comparable to other statistical shape modeling methods using multiple radiographs as input data. There is a need to develop an anthropometric-based knee prosthesis for the Chinese population. Based on the anthropometry of the Chinese population, our new design fits Chinese patients better and reserves more bone volume compared with current commercial prostheses, which is an essential step toward AM for personalized knee prostheses.

Keywords： Additive manufacturing     Population-based design     Total knee replacement     Knee prosthesis     Anthropometric measurement    

HTML PDF Collect

Title Author Date Type Operation

Quantification of hydration products in cementitious materials incorporating silica nanoparticles

GOEL,S. K. BHATTACHARYYA,G. MISHRA

Journal Article

Modern developments related to nanotechnology and nanoengineering of concrete

Konstantin SOBOLEV

Journal Article

The capture of carbon dioxide by transition metal aluminates, calcium aluminate, calcium zirconate, calciumsilicate and lithium zirconate

Ganesh TILEKAR, Kiran SHINDE, Kishor KALE, Reshma RASKAR, Abaji GAIKWAD

Journal Article

Impacts of CO2 and H2S on the risk of hydrate formation during pipeline transport of natural gas

Solomon A. Aromada, Bjørn Kvamme

Journal Article

Microstructural and photocatalytic characterization of cement-paste sol-gel synthesized titanium dioxide

Elena CERRO-PRADA,Miguel MANSO,Vicente TORRES,Jesús SORIANO

Journal Article

Effect of a commercial dispersion of multi walled carbon nanotubes on the hydration of an oil well cementing paste

Ocar Aurelio MENDOZA REALES,William C.PEARL Jr,Maria D. M. PAIVA,CristianeR.

Journal Article

Effect of the degree of template removal from mesoporous silicate materials on their adsorption of heavy

Farouq TWAIQ,M.S. NASSER,Sagheer A. ONAIZI

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

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

S. Q. XIE, S. C. WONG, William H. K. LAM

Journal Article

Experimental study and field application of calcium sulfoaluminate cement for rapid repair of concrete

Yanhua GUAN, Ying GAO, Renjuan SUN, Moon C. WON, Zhi GE

Journal Article

Full-band error control and crack-free surface fabrication techniques for ultra-precision fly cutting of large-aperture KDP crystals

H. ZHANG, S. F. WANG, C. H. AN, J. WANG, Q. XU

Journal Article

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

Journal Article

Tracking of safety hazards and real-time-prediction model of safety risks on construction sites

LAM,Li Qiming,Michael C. H. YAM,David A. S. CHEW

Journal Article

Design of GPRS Data Terminal Based on S3C2410

Sun Xueyong

Journal Article

Population-Based and Personalized Design of Total Knee Replacement Prosthesis for Additive Manufacturing Based on Chinese Anthropometric Data

C.S. Chui, K.S. Leung, J. Qin, D. Shi, P. Augat, R.M.Y. Wong, S.K.H. Chow, X.Y. Huang, C.Y.Lai, P.S.H. Yung, L. Qin, W.H. Cheung

Journal Article