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Study and application of floatover technology in 10 000 ton class Topside

Xun Hailong,Zhu Xiaohuan

Strategic Study of CAE 2011, Volume 13, Issue 5, Pages 93-97

Abstract:

In this study, the floatover technology applicated in platform engineeringequipment, acility is briefly introduced, through the study of offshore 10000-T class topside floatover technology, and integrating successful application of varied technology in LD27/232/2 oil field development inIt will be used in guidance of application in 10000-T topside float-over technology in Bohai Bay, and

Keywords： float-over technology leg mating unit high support load slipper topside supporting unit fender

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Use of float consumption rate in resource leveling of construction projects

Atilla DAMCI, Gul POLAT, Firat Dogu AKIN, Harun TURKOGLU

Frontiers of Engineering Management 2022, Volume 9, Issue 1, Pages 135-147 doi: 10.1007/s42524-020-0118-0

Abstract: For this purpose, this study has developed a model that considers the float consumption rates of activitiesThe float consumption rate is the percentage that is set to determine the maximum amount of float whichThe proposed model allows a scheduler to assign float consumption rates to each activity that can bechanges the required daily resources as it shifts the noncritical activities along their available total float

Keywords： resource management resource leveling float consumption rate scheduling

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Analysis and comparison of laser cutting performance of solar float glass with different scanning modes

Wenyuan LI, Yu HUANG, Youmin RONG, Long CHEN, Guojun ZHANG, Zhangrui GAO

Frontiers of Mechanical Engineering 2021, Volume 16, Issue 1, Pages 97-110 doi: 10.1007/s11465-020-0600-8

Abstract: These modes can achieve high-performance hole cutting of thick solar float glass using a 532-nm nanosecondconcluded that the concentric circle scanning mode shows evident advantages in the performance of solar float

Keywords： laser cutting solar float glass scanning mode surface quality cutting efficiency

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Synthesis of methanol and ethanol over CuZnAl slurry catalyst prepared by complete liquid-phase technology

Wei HUANG, Linmei YU, Wenhui LI, Zhili MA

Frontiers of Chemical Science and Engineering 2010, Volume 4, Issue 4, Pages 472-475 doi: 10.1007/s11705-010-0525-6

Abstract: A new method, named the complete liquid-phase technology, has been applied to prepare catalysts for methanol

Keywords： methanol slurry ethanol complete liquid-phase technology CuZnAl catalyst

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Engineering over the Past Century

Song Jian

Strategic Study of CAE 2002, Volume 4, Issue 3, Pages 1-5

Abstract:

This paper reviews the progress of engineering in the world over the 20 th century, and describes

Keywords： 20th century engineering science and technology social progress economic development scientific and technical

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Reductive amination of -hexanol to -hexylamine over Ni–Ce/-AlO catalysts

Frontiers of Chemical Science and Engineering 2023, Volume 17, Issue 1, Pages 82-92 doi: 10.1007/s11705-022-2181-z

Abstract: The amination of alkyl alcohols is one of the most promising paths in synthesis of aliphatic amines. Herein, cerium doped nickel-based catalysts were synthesized and tested in a gas-phase amination of n-hexanol to n-hexylamine. It was found that the activity of the Ni/γ-Al₂O₃ catalyst is significantly improved by doping an appropriate amount of cerium. The presence of cerium effectively inhibits the agglomeration of nickel particle, resulting in better Ni dispersion. As Ni particle size plays critical role on the catalytic activity, higher turnover frequency of n-hexanol amination was achieved. Cerium doping also improves the reduction ability of nickel and enhances the interactions between Ni and the catalyst support. More weak acid sites were also found in those cerium doped catalysts, which promote another key step—ammonia dissociative adsorption in this reaction system. The overall synergy of Ni nanoparticles and acid sites of this Ni–Ce/γ-Al₂O₃ catalyst boosts its superior catalytic performance in the amination of n-hexanol.

Keywords： amination alcohol cerium nickel acidity interaction

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Supersonic flows over cavities

FANG Tianwen, DING Meng, ZHOU Jin

Frontiers in Energy 2008, Volume 2, Issue 4, Pages 528-533 doi: 10.1007/s11708-008-0055-9

Abstract: The characteristics of supersonic cold flows over cavities were investigated experimentally and numerically

Keywords： supersonic different ratio

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Efficient conversion of lignin to alkylphenols over highly stable inverse spinel MnFeO catalysts

Frontiers of Chemical Science and Engineering 2023, Volume 17, Issue 8, Pages 1085-1095 doi: 10.1007/s11705-022-2236-1

Abstract: The aromatic properties of lignin make it a promising source of valuable chemicals and fuels. Developing efficient and stable catalysts to effectively convert lignin into high-value chemicals is challenging. In this work, MnFe₂O₄ spinel catalysts with oxygen-rich vacancies and porous distribution were synthesized by a simple solvothermal process and used to catalyze the depolymerization of lignin in an isopropanol solvent system. The specific surface area was 110.5 m²∙g^–1, which substantially increased the active sites for lignin depolymerization compared to Fe₃O₄. The conversion of lignin reached 94%, and the selectivity of alkylphenols exceeded 90% after 5 h at 250 °C. Underpinned by characterizations, products, and density functional theory analysis, the results showed that the catalytic performance of MnFe₂O₄ was attributed to the composition of Mn and Fe with strong Mn–O–Fe synergy. In addition, the cycling experiments and characterization showed that the depolymerized lignin on MnFe₂O₄ has excellent cycling stability. Thus, our work provides valuable insights into the mechanism of lignin catalytic depolymerization and paves the way for the industrial-scale application of this process.

Keywords： lignin depolymerization spinel catalysts hydrogenation

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NO hydrogenation to NH over FeCu/TiO catalyst with improved activity

Frontiers of Chemical Science and Engineering 2023, Volume 17, Issue 12, Pages 1973-1985 doi: 10.1007/s11705-023-2364-2

Abstract: Ammonia is crucial in industry and agriculture, but its production is hindered by environmental concerns and energy-intensive processes. Hence, developing an efficient and environmentally friendly catalyst is imperative. In this study, we employed a straightforward and efficient impregnation technique to create various Cu-doped catalysts. Notably, the optimized 10Fe-8Cu/TiO₂ catalyst exhibited exceptional catalytic performance in converting NO to NH₃, achieving an NO conversion rate exceeding 80% and an NH₃ selectivity exceeding 98% at atmospheric pressure and 350 °C. We employed in situ diffuse reflectance Fourier transform infrared spectroscopy and conducted density functional theory calculations to investigate the intermediates and subsequent adsorption. Our findings unequivocally demonstrate that Cu doping enhances the rate-limiting hydrogenation step and lowers the energy barrier for NH₃ desorption, thereby resulting in improved NO conversion and enhanced selectivity toward ammonia. This study presents a pioneering approach toward energy-efficient ammonia synthesis and recycling of nitrogen sources.

Keywords： NO hydrogenation synthetic ammonia 10Fe-xCu/TiO₂ high selectivity

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REVEALS METABOLITE VARIATION AND FLAVONOID REGULATORY NETWORKS IN FRESH SHOOTS OF TEA (CAMELLIA SINENSIS) OVER

Frontiers of Agricultural Science and Engineering 2021, Volume 8, Issue 2,

Abstract:

Metabolites, especially secondary metabolites, are very important in the adaption of tea plants and the quality of tea products. Here, we focus on the seasonal variation in metabolites of fresh tea shoots and their regulatory mechanism at the transcriptional level. The metabolic profiles of fresh tea shoots of 10 tea accessions collected in spring, summer, and autumn were analyzed using ultra-performance liquid chromatography coupled with quadrupole-obitrap mass spectrometry. We focused on the metabolites and key genes in the phenylpropanoid/flavonoid pathway integrated with transcriptome analysis. Multivariate statistical analysis indicates that metabolites were distinctly different with seasonal alternation. Flavonoids, amino acids, organic acids and alkaloids were the predominant metabolites. Levels of most key genes and downstream compounds in the flavonoid pathway were lowest in spring but the catechin quality index was highest in spring. The regulatory pathway was explored by constructing a metabolite correlation network and a weighted gene co-expression network.

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Plastic materials and water sources actively select and shape wastewater plastispheres over time

Frontiers of Environmental Science & Engineering 2022, Volume 16, Issue 11, doi: 10.1007/s11783-022-1580-1

Abstract:

● Wastewater MPs exhibited resistomes and therefore health threats.

Keywords： Microplastics Whole-genome metagenomic sequencing Plastisphere Plastic degradation MHETase

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Stability and agility: biped running over varied and unknown terrain

Yang YI,Zhi-yun LIN

Frontiers of Information Technology & Electronic Engineering 2015, Volume 16, Issue 4, Pages 283-292 doi: 10.1631/FITEE.1400284

Abstract: We tackle the problem of a biped running over varied and unknown terrain.It is able to run over upward and downward terrain with a height difference of 0.15 m, which shows the

Keywords： Underactuated running biped Dynamic balance Varied and unknown terrain

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of cardiac disease with the risk of post-lung transplantation mortality in Chinese recipients aged over

Frontiers of Medicine 2023, Volume 17, Issue 1, Pages 58-67 doi: 10.1007/s11684-022-0937-y

Abstract: Group D restrictive lung disease was the main indication of a lung transplant in recipients over 65 years

Keywords： cardiac disease mortality aged population lung transplantation

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Mechanism of dichloromethane disproportionation over mesoporous TiO

Yuzhou Deng, Shengpan Peng, Haidi Liu, Shuangde Li, Yunfa Chen

Frontiers of Environmental Science & Engineering 2019, Volume 13, Issue 2, doi: 10.1007/s11783-019-1113-8

Abstract:

• Mechanism of DCM disproportionation over mesoporous TiO₂

Keywords： Dichloromethane Disproportionation Mechanism Anatase (001) Water dissociation

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Potential advantages in combining smart and green infrastructure over silo approaches for future cities

Yamuna KALUARACHCHI

Frontiers of Engineering Management 2021, Volume 8, Issue 1, Pages 98-108 doi: 10.1007/s42524-020-0136-y

Abstract: With the growing demand for smart technology, a series of problems and challenges, including governancepotential to transition from grey, green, or smart silos to work with nature-based solutions and smart technology

Keywords： grey infrastructure green infrastructure smart infrastructure smart and green combined infrastructure smart cities future cities