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EFFECTS OF SUBSTITUTION OF MINERAL NITROGEN WITH ORGANIC AMENDMENTS ON NITROGEN LOSS FROM SLOPING CROPLAND

Frontiers of Agricultural Science and Engineering 2022, Volume 9, Issue 3,   Pages 396-406 doi: 10.15302/J-FASE-2022456

Abstract:

● Interflow acts as the dominant pathway for N loss loadings.

Keywords： improved fertilization regime     interflow     nitrogen forms     nitrogen leaching     purple soil     sloping cropland    

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Unnormalized and normalized forms of gefura measures in directed and undirected networks

Raf GUNS,Ronald ROUSSEAU

Frontiers of Information Technology & Electronic Engineering 2015, Volume 16, Issue 4,   Pages 311-320 doi: 10.1631/FITEE.1400425

Abstract: In some networks nodes belong to predefined groups (e.g., authors belong to institutions). Common network centrality measures do not take this structure into account. Gefura measures are designed as indicators of a node’s brokerage role between such groups. They are defined as variants of betweenness centrality and consider to what extent a node belongs to shortest paths between nodes from different groups. In this article we make the following new contributions to their study: (1) We systematically study unnormalized gefura measures and show that, next to the ‘structural’ normalization that has hitherto been applied, a ‘basic’ normalization procedure is possible. While the former normalizes at the level of groups, the latter normalizes at the level of nodes. (2) Treating undirected networks as equivalent to symmetric directed networks, we expand the definition of gefura measures to the directed case. (3) It is shown how Brandes’ algorithm for betweenness centrality can be adjusted to cover these cases.

Keywords： Networks subdivided in groups     Partitions     Gefura measures     Q-measures     Brokerage role     Directed and undirected networks     Brandes’     algorithm    

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Spatial distribution of phosphorus forms in sediments with different distances to the estuary of the

Shaoyong LU, Xiangcan JIN, Fengchang WU, Jing SI, Jianning GUO,

Frontiers of Environmental Science & Engineering 2010, Volume 4, Issue 3,   Pages 295-300 doi: 10.1007/s11783-010-0231-0

Abstract: Effects of human activity on the distribution of phosphorus (P) forms were investigated for the sedimentsBoth concentrations of total nitrogen and nitrogen in the sediment porewaters decreased to some content

Keywords： estuary sedimentary area     phosphorus (P)     spatial distribution     human activity     the Dianchi Lake    

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Characterization of phosphorus species and modeling for its organic forms in eutrophic shallow lake sediments

Hongguang CHENG,Xiao PU,Yiting CHEN,Fanghua HAO,Liming DONG

Frontiers of Environmental Science & Engineering 2014, Volume 8, Issue 6,   Pages 905-921 doi: 10.1007/s11783-014-0650-4

Abstract: Variations of phosphorus (P) and its species in surface sediment of Baiyangdian Lake, a eutrophic shallow lake located in North China, were investigated through combination of field survey and numerical calculation based on cluster analysis. P fractionation was performed by a sequential extraction scheme, categorized as loosely bound P (NH Cl-P), reductant soluble P (BD-P), metallic oxide bound P (NaOH-P), calcium bound P (HCl-P) and organic P (Org-P). P concentrations exhibited regional similarities and a total of four sub-areas were identified in which the same rank was HCl-P>Org-P>BD-P ≈ NaOH-P>NH Cl-P. NH Cl-P, BD-P and Org-P were found to contribute to P enrichment in overlying water column. Specifically, labile Org-P acted as a potential pool with a greater contribution in aerobic layer compared to anaerobic layer. A hysteresis (lag= 4 months) existed when labile Org-P concentration was negatively correlated with aerobic layer thickness. In view of magnitude of identified P contributors in sub-areas, higher potential of P release was present in Fuhe River and Tang River estuary areas. On the basis of calibration and verification, the mathematical model with parameter settings applied in this study was improved to serve as a tool for limnology management and eutrophic control.

Keywords： phosphorus fractionation     variation characteristics     modeling     sediment     Baiyangdian Lake    

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SUSTAINABLE NITROGEN MANAGEMENT IN AUSTRALIAN AGROECOSYSTEMS: CHALLENGES AND OPPORTUNITIES

Frontiers of Agricultural Science and Engineering 2022, Volume 9, Issue 3,   Pages 366-372 doi: 10.15302/J-FASE-2022447

Abstract:

● There is huge potential for improvement of nitrogen management in

Keywords： Australian agroecosystems     reactive nitrogen     sustainable development    

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SUSTAINABLE NITROGEN MANAGEMENT FOR VEGETABLE PRODUCTION IN CHINA

Frontiers of Agricultural Science and Engineering 2022, Volume 9, Issue 3,   Pages 373-385 doi: 10.15302/J-FASE-2022455

Abstract:

● Sustainable nitrogen management strategies for Chinese vegetable production

Keywords： enhanced-efficiency nitrogen fertilizer     integrated knowledge and products strategy     nitrogen rate     reactivenitrogen loss     vegetable     yield    

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Micro/nanofluidics-enabled energy conversion and its implemented devices

Yang YANG, Jing LIU

Frontiers in Energy 2011, Volume 5, Issue 3,   Pages 270-287 doi: 10.1007/s11708-010-0126-6

Abstract: According to the conservation law, energy not only exists in various forms but is also capable of beingThe common forms of energy are mechanical energy, chemical energy, internal energy, electrical energynanofluid-enabled energy conversion devices is reviewed based on the transformation between different forms

Keywords： micro/nanofluid     different energy forms     energy conversion     medium role    

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Nitrogen distribution in the products from the hydrothermal liquefaction of sp. and sp.

Frontiers of Chemical Science and Engineering 2022, Volume 16, Issue 6,   Pages 985-995 doi: 10.1007/s11705-021-2126-y

Abstract: The high contents of nitrogen-containing organic compounds in biocrude obtained from hydrothermal liquefactionThree main forms of nitrogen-containing organic compounds including nitrogen-heterocyclic compounds,The contents of nitrogen-heterocyclic compounds decreased with temperature while amide kept increasingThe effect of residence time on the components of nitrogen-containing organic compounds was similar withcomparing with the nitrogen in neutral amino acids of Chlorella sp.

Keywords： microalgae     hydrothermal liquefaction     biocrude     nitrogen distribution    

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SOIL NITROGEN CYCLING AND ENVIRONMENTAL IMPACTS IN THE SUBTROPICAL HILLY REGION OF CHINA: EVIDENCE FROM

Frontiers of Agricultural Science and Engineering 2022, Volume 9, Issue 3,   Pages 407-424 doi: 10.15302/J-FASE-2022448

Abstract:

● Soil nitrogen fluxes and influencing factors were reviewed in the

Keywords： nitrogen cycling     soil nitrogen     nitrogen deposition     greenhouse gases emission     non-point source pollution     nitrogen use efficiency    

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PROGRESS ON IMPROVING AGRICULTURAL NITROGEN USE EFFICIENCY: UK-CHINA VIRTUAL JOINT CENTERS ON NITROGEN

Frontiers of Agricultural Science and Engineering 2022, Volume 9, Issue 3,   Pages 475-489 doi: 10.15302/J-FASE-2022459

Abstract:

● Virtual joint centers on N agronomy were established between UK and China.

Keywords： CINAg     N-CIRCLE     nitrogen use efficiency     reactive nitrogen     sustainable production    

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IMPROVING NITROGEN SAFETY IN CHINA: NITROGEN FLOWS, POLLUTION AND CONTROL

Frontiers of Agricultural Science and Engineering 2022, Volume 9, Issue 3,   Pages 465-474 doi: 10.15302/J-FASE-2022454

Abstract:

● It is necessary to address the N flows and their impacts on environment in China for sustainable N management.

Keywords： barriers     future management     ammonia emissions     nitrogen input     water N pollution    

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Present situation and classification of piezoelectric pump

Fang YE, Shouyin WANG, Wei CHENG, Qixiao XIA, Jianhui ZHANG,

Frontiers of Mechanical Engineering 2009, Volume 4, Issue 4,   Pages 420-429 doi: 10.1007/s11465-009-0052-7

Abstract: New forms of piezoelectric pumps, different from traditional ones, are only at the stage of conception

Keywords： piezoelectric pump     development and present situation     new classification method     valveless piezoelectric pump     new forms    

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Comparison between linear and non-linear forms of pseudo-first-order and pseudo-second-order adsorption

Junxiong LIN , Lan WANG ,

Frontiers of Environmental Science & Engineering 2009, Volume 3, Issue 3,   Pages 320-324 doi: 10.1007/s11783-009-0030-7

Abstract: The best-fit equations of linear and non-linear forms of the two widely used kinetic models, namely pseudo-first-orderThe results show that the non-linear forms of pseudo-first-order and pseudo-second-order models weremore suitable than the linear forms for fitting the experimental data.may have been distorted by linearization of the linear kinetic equations, and thus, the non-linear forms

Keywords： adsorption     pseudo-first order     pseudo-second order     kinetic model     linear method     non-linear method    

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Recent advances and challenges of nitrogen/nitrate electro catalytic reduction to ammonia synthesis

Frontiers in Energy doi: 10.1007/s11708-023-0908-2

Abstract: synthesis of ammonia is a green and mild new method for preparing ammonia, which can directly convert nitrogenHerein, the basic mechanism of the nitrogen reduction reaction (NRR) to ammonia and nitrate reduction

Keywords： electrochemical ammonia synthesis     nitrogen     nitrate     nitrogen reduction reaction (NRR) to ammonia     nitrate    

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ECOLOGICAL EFFECTS OF NITROGEN DEPOSITION ON URBAN FORESTS: AN OVERVIEW

Frontiers of Agricultural Science and Engineering 2022, Volume 9, Issue 3,   Pages 445-456 doi: 10.15302/J-FASE-2021429

Abstract:

● Patterns and effects of N deposition on urban forests are reviewed.

Keywords： biodiversity     carbon sequestration     nitrogen deposition     nutrient imbalance     soil acidification     urban    

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Title Author Date Type Operation

EFFECTS OF SUBSTITUTION OF MINERAL NITROGEN WITH ORGANIC AMENDMENTS ON NITROGEN LOSS FROM SLOPING CROPLAND

Journal Article

Unnormalized and normalized forms of gefura measures in directed and undirected networks

Raf GUNS,Ronald ROUSSEAU

Journal Article

Spatial distribution of phosphorus forms in sediments with different distances to the estuary of the

Shaoyong LU, Xiangcan JIN, Fengchang WU, Jing SI, Jianning GUO,

Journal Article

Characterization of phosphorus species and modeling for its organic forms in eutrophic shallow lake sediments

Hongguang CHENG,Xiao PU,Yiting CHEN,Fanghua HAO,Liming DONG

Journal Article

SUSTAINABLE NITROGEN MANAGEMENT IN AUSTRALIAN AGROECOSYSTEMS: CHALLENGES AND OPPORTUNITIES

Journal Article

SUSTAINABLE NITROGEN MANAGEMENT FOR VEGETABLE PRODUCTION IN CHINA

Journal Article

Micro/nanofluidics-enabled energy conversion and its implemented devices

Yang YANG, Jing LIU

Journal Article

Nitrogen distribution in the products from the hydrothermal liquefaction of sp. and sp.

Journal Article

SOIL NITROGEN CYCLING AND ENVIRONMENTAL IMPACTS IN THE SUBTROPICAL HILLY REGION OF CHINA: EVIDENCE FROM

Journal Article

PROGRESS ON IMPROVING AGRICULTURAL NITROGEN USE EFFICIENCY: UK-CHINA VIRTUAL JOINT CENTERS ON NITROGEN

Journal Article

IMPROVING NITROGEN SAFETY IN CHINA: NITROGEN FLOWS, POLLUTION AND CONTROL

Journal Article

Present situation and classification of piezoelectric pump

Fang YE, Shouyin WANG, Wei CHENG, Qixiao XIA, Jianhui ZHANG,

Journal Article

Comparison between linear and non-linear forms of pseudo-first-order and pseudo-second-order adsorption

Junxiong LIN , Lan WANG ,

Journal Article

Recent advances and challenges of nitrogen/nitrate electro catalytic reduction to ammonia synthesis

Journal Article

ECOLOGICAL EFFECTS OF NITROGEN DEPOSITION ON URBAN FORESTS: AN OVERVIEW

Journal Article