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A novel approach to minimizing material loss for computer numerical control flank-regrinding of worn end mills

Frontiers of Mechanical Engineering 2023, Volume 18, Issue 3, doi: 10.1007/s11465-023-0757-z

Abstract: Moreover, over-cut would happen to the flutes of worn cutters in the regrinding processes because ofto planning the wheel path for regrinding worn end mills to minimize material loss and recover the over-cutMoreover, a second regrinding strategy is applied to recover the flute shape over-cut in the first grinding

Keywords： flank-regrinding     worn end mill     wheel position and orientation     material loss     over-cut    

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Depth of cut models for multipass abrasive waterjet cutting of alumina ceramics with nozzle oscillation

Jun WANG

Frontiers of Mechanical Engineering 2010, Volume 5, Issue 1,   Pages 19-32 doi: 10.1007/s11465-009-0082-1

Abstract: An experimental study of the depth of cut in multipass abrasive waterjet (AWJ) cutting of alumina ceramicsIt is found that this cutting technique can significantly increase the depth of cut by an average ofPredictive models for the depth of cut are then developed.

Keywords： abrasive waterjet     engineering ceramics     depth of cut     cutting performance     nozzle oscillation     machining    

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liquid addition attained advanced nitrogen removal in low C/N ratio municipal wastewater through short-cut

Shengjie Qiu, Jinjin Liu, Liang Zhang, Qiong Zhang, Yongzhen Peng

Frontiers of Environmental Science & Engineering 2021, Volume 15, Issue 2, doi: 10.1007/s11783-020-1318-x

Abstract: Stable short-cut nitrification was achieved after 46d and then anammox sludge was inoculated.

Keywords： Sludge fermentation liquid     Municipal wastewater     Advanced nitrogen removal     Short-cut nitrification     Partial    

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Study on the Nonlinear Characteristics of Cutting Forces in High-speed Face-milling of Difficult-to-cut

Long Zhenhai,Wang Xibin,Wang Haochen

Strategic Study of CAE 2004, Volume 6, Issue 10,   Pages 28-31

Abstract: study shows that in high speed milling of Martensitic stainless process, the interaction of depth of cutper tooth has significant effect on the cutting force; the interaction of feed per tooth and depth of cut

Keywords： difficult-to-cut materials     high speed machining     factorials design     Meyer wavelet transform     Mallat algorithm    

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A review of low-temperature plasma-assisted machining: from mechanism to application

Frontiers of Mechanical Engineering 2023, Volume 18, Issue 1, doi: 10.1007/s11465-022-0734-y

Abstract: the effects of the low-temperature plasma on different machining processes of various difficult-to-cut

Keywords： low-temperature plasma     difficult-to-cut material     machinability     hydrophilization effect     Rehbinder    

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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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Production of N

Youkui GONG,Yongzhen PENG,Shuying WANG,Sai WANG

Frontiers of Environmental Science & Engineering 2014, Volume 8, Issue 4,   Pages 589-597 doi: 10.1007/s11783-013-0571-7

Abstract: conversion to N O gas was 27.7% and 36.8% of loss for conventional biologic N-removal process and short-cutHigher nitrite accumulation resulted in higher N O emission in the short-cut nitrogen removal process

Keywords： conventional N-removal process     N2O     short-cut N-removal process     nitrite accumulation     ammonia    

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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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Influence of entrainer recycle for batch heteroazeotropic distillation

Laszlo Hegely, Peter Lang

Frontiers of Chemical Science and Engineering 2018, Volume 12, Issue 4,   Pages 643-659 doi: 10.1007/s11705-018-1760-5

Abstract: The effects of recycling the entrainer and the off-cut are studied by dynamic simulation with a professionalThe E-rich phase, the final column hold-up and the off-cut (Mode II only) are recycled to the next batch

Keywords： batch distillation     heteroazeotropic distillation     operational policies     off-cut recycle     entrainer    

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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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Title Author Date Type Operation

A novel approach to minimizing material loss for computer numerical control flank-regrinding of worn end mills

Journal Article

Depth of cut models for multipass abrasive waterjet cutting of alumina ceramics with nozzle oscillation

Jun WANG

Journal Article

liquid addition attained advanced nitrogen removal in low C/N ratio municipal wastewater through short-cut

Shengjie Qiu, Jinjin Liu, Liang Zhang, Qiong Zhang, Yongzhen Peng

Journal Article

Study on the Nonlinear Characteristics of Cutting Forces in High-speed Face-milling of Difficult-to-cut

Long Zhenhai,Wang Xibin,Wang Haochen

Journal Article

A review of low-temperature plasma-assisted machining: from mechanism to application

Journal Article

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

Journal Article

Supersonic flows over cavities

FANG Tianwen, DING Meng, ZHOU Jin

Journal Article

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

Journal Article

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

Journal Article

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

Journal Article

Production of N

Youkui GONG,Yongzhen PENG,Shuying WANG,Sai WANG

Journal Article

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

Journal Article

Influence of entrainer recycle for batch heteroazeotropic distillation

Laszlo Hegely, Peter Lang

Journal Article

Stability and agility: biped running over varied and unknown terrain

Yang YI,Zhi-yun LIN

Journal Article

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

Journal Article