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Numerical study of internal flow field and flow passage improvement of an inlet particle separator

Florian PAOLI, Tong WANG

Frontiers in Energy 2011, Volume 5, Issue 4,   Pages 386-397 doi: 10.1007/s11708-011-0156-8

Abstract: An adjacent objective of the study is to lower pressure losses of the inlet particle separator (IPS).The velocity distribution in different sections and the pressure coefficient along the duct have beenlosses limitation.Besides, pressure losses are greatly decreased in both outlets (up to 30% for high Reynolds number) andlosses for a wide range of inlet Reynolds numbers.

Keywords： streamlines     pressure losses     flow passage improvement     inlet particle separator (IPS)    

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Development of an analytical model to estimate the churning losses in high-speed axial piston pumps

Frontiers of Mechanical Engineering 2022, Volume 17, Issue 2, doi: 10.1007/s11465-021-0671-1

Abstract: rotating parts are fully immersed in the casing oil during operation, leading to considerable churning losses(more than 10% of total power losses) at high rotational speeds.The churning losses deserve much attention at the design stage of high-speed axial piston pumps, butaccurate analytical models are not available to estimate the drag torque associated with the churning lossesThe presented analytical model provides practical guidelines for reducing the churning losses in high-speed

Keywords： axial piston pump     rotating parts     high rotational speed     churning losses     drag torque    

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NUTRIENT USE EFFICIENCY AND LOSSES OF INDUSTRIAL FARMS AND MIXED SMALLHOLDINGS: LESSONS FROM THE NORTH

Frontiers of Agricultural Science and Engineering 2021, Volume 8, Issue 1,

Abstract: Here, we aimed to quantify nutrient flows, nutrient use efficiency, and nutrient losses in differentTo produce 1 kg N and P in animal products, nutrient losses in industrial pig farms (2.0 kg N and 1.3kg P) were lower than in mixed pig smallholdings, nutrient losses in industrial dairy farms (2.7 kgLiquid manure discharge in industrial farms was the main losses pathway in contrast to mixed smallholdings
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HOTSPOTS OF NUTRIENT LOSSES TO AIR AND WATER: AN INTEGRATED MODELING APPROACH FOR EUROPEAN RIVER BASINS

Frontiers of Agricultural Science and Engineering 2023, Volume 10, Issue 4,   Pages 579-592 doi: 10.15302/J-FASE-2023526

Abstract:

Nutrient pollution of air and water is a persistent problem in Europe. However, the pollution sources are often analyzed separately, preventing the formulation of integrative solutions. This study aimed to quantify the contribution of agriculture to air, river and coastal water pollution by nutrients. A new MARINA-Nutrients model was developed for Europe to calculate inputs of nitrogen (N) and phosphorus (P) to land and rivers, N emissions to air, and nutrient export to seas by river basins. Under current practice, inputs of N and P to land were 34.4 and 1.8 Tg·yr–1, respectively. However, only 12% of N and 3% of P reached the rivers. Agriculture was responsible for 55% of N and sewage for 67% of P in rivers. Reactive N emissions to air from agriculture were calculated at 4.0 Tg·yr–1. Almost two-fifths of N emissions to air were from animal housing and storage. Nearly a third of the basin area was considered as pollution hotspots and generated over half of N emissions to air and nutrient pollution in rivers. Over 25% of river export of N ended up in the Atlantic Ocean and of P in the Mediterranean Sea. These results could support environmental policies to reduce both air and water pollution simultaneously, and avoid pollution swapping.

Keywords： agriculture     air-water modeling     European rivers     nutrient pollution     sewage systems     source attribution    

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GASEOUS REACTIVE NITROGEN LOSSES FROM ORCHARDS, VEGETABLES AND TEA PLANTATIONS

Frontiers of Agricultural Science and Engineering 2023, Volume 10, Issue 2,   Pages 155-166 doi: 10.15302/J-FASE-2022477

Abstract:

● Gaseous N emissions from orchards, vegetables and tea plantations (OVT) are reviewed.

Keywords： fruit     greenhouse gas     green development     fertilizer management     climate change    

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Exergy losses in premixed flames of dimethyl ether and hydrogen blends

Tongbin ZHAO, Jiabo ZHANG, Dehao JU, Zhen HUANG, Dong HAN

Frontiers in Energy 2019, Volume 13, Issue 4,   Pages 658-666 doi: 10.1007/s11708-019-0645-8

Abstract: conducted for stoichiometric premixed dimethyl ether (DME)/hydrogen (H )/air flames at atmospheric pressureThe exergy losses from the irreversibility sources, i.e., chemical reaction, heat conduction and speciesIt is observed that, regardless of the fuel blends, chemical reaction contributes most to the exergy lossesThe results also indicate that increased H substitution decreases the exergy losses from reactions,The decreases in exergy losses by chemical reactions and heat conduction are higher, but the exergy loss

Keywords： second law analysis     flame     dimethyl ether (DME)     hydrogen     binary fuels    

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Test investigation on hydraulic losses in the discharge passage of an axial-flow pump

QIU Baoyun, CAO Haihong, JIANG Wei, GAO Zhaohui, WANG Fei

Frontiers of Mechanical Engineering 2007, Volume 2, Issue 1,   Pages 50-56 doi: 10.1007/s11465-007-0008-8

Abstract: passage, the discharge in the left channel is bigger than that in the right, and the passage hydraulic lossesThe methods deducing the hydraulic losses are investigated.The results indicate that the passage hydraulic losses are not proportional to the flow discharge.Compared with a circular pipe, the hydraulic losses of a divergent discharge passage are smaller andare also big, but a small circulation can slightly reduce hydraulic losses.
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Development and testing of a weather-based model to determine potential yield losses caused by potato

Alexey FILIPPOV, Maria KUZNETSOVA, Alexander ROGOZHIN, Olga IAKUSHEVA, Valentina DEMIDOVA, Natalia STATSYUK

Frontiers of Agricultural Science and Engineering 2018, Volume 5, Issue 4,   Pages 462-468 doi: 10.15302/J-FASE-2018239

Abstract: To minimize yield losses, various protective measures are used including fungicide application.development in an experimental potato field recorded over 30 seasons, a simulator to forecast yield lossesThe average difference between the calculated and real yield losses did not exceed 5%.Using the simulator and weather data for a period of 2007-2017, yield losses were calculated for several

Keywords： potato     late blight     Phytophthora infestans     yield losses     retrospective analysis     mathematical model    

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CLIMATE-CHANGE-INDUCED TEMPORAL VARIATION IN PRECIPITATION INCREASES NITROGEN LOSSES FROM INTENSIVE CROPPING

Frontiers of Agricultural Science and Engineering 2022, Volume 9, Issue 3,   Pages 457-464 doi: 10.15302/J-FASE-2022452

Abstract: to evaluate how increasing temporal variability in precipitation influences crop yields and nitrogen losses

Keywords： crop yield     fertilizer timing     nitrogen loss     precipitation variability     toy model    

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Numerical study of conduction and radiation heat losses from vacuum annulus in parabolic trough receivers

Dongqiang LEI, Yucong REN, Zhifeng WANG

Frontiers in Energy 2022, Volume 16, Issue 6,   Pages 1048-1059 doi: 10.1007/s11708-020-0670-7

Abstract: In this paper, conduction and radiation heat losses are analyzed respectively to identify the heat lossThe effects of annulus pressure, gas species, temperature of heat transfer fluid, and annulus size onthe conduction and radiation heat losses are systematically analyzed.

Keywords： parabolic trough receiver     vacuum annulus     rarefied gas     DSMC (direct simulation Monte Carlo)     heat loss    

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NUTRIENT USE EFFICIENCY AND LOSSES OF INDUSTRIAL FARMS AND MIXED SMALLHOLDINGS: LESSONS FROM THE NORTH

Yifei MA, Ling ZHANG, Zhaohai BAI, Rongfeng JIANG, Yong HOU, Lin MA

Frontiers of Agricultural Science and Engineering 2021, Volume 8, Issue 1,   Pages 58-71 doi: 10.15302/J-FASE-2020371

Abstract: Here, we aimed to quantify nutrient flows, nutrient use efficiency, and nutrient losses in differentTo produce 1 kg N and P in animal products, nutrient losses in industrial pig farms (2.0 kg N and 1.3kg P) were lower than in mixed pig smallholdings, nutrient losses in industrial dairy farms (2.7 kgLiquid manure discharge in industrial farms was the main losses pathway in contrast to mixed smallholdings

Keywords： industrial farms     mixed smallholdings     pig     dairy     nutrient management    

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Optimal Su-Do-Ku based interconnection scheme for increased power output from PV array under partial shading conditions

P. SRINIVASA RAO,P. DINESH,G. SARAVANA ILANGO,C. NAGAMANI

Frontiers in Energy 2015, Volume 9, Issue 2,   Pages 199-210 doi: 10.1007/s11708-015-0350-1

Abstract: They drastically reduce the power output because of mismatch losses, which are reliant on the shape ofarrangement increases the length of the wire required to interconnect the panels thus increasing the line losses

Keywords： array configuration     mismatch losses     partial shading     line losses     Su-Do-Ku arrangement    

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Development and challenges of green food in China

Mahmood ul HASSAN, Xin WEN, Jiuliang XU, Jiahui ZHONG, Xuexian LI

Frontiers of Agricultural Science and Engineering 2020, Volume 7, Issue 1,   Pages 56-66 doi: 10.15302/J-FASE-2019296

Abstract:

Green food in China refers to a wide array of primary and processed agricultural products that are safe, nutritious and of high quality for human consumption. Green food has been certified and produced following the principle of sustainability since the 1990s, making historic achievements in providing quality food, protecting the environment, increasing farmer income, and nurturing agricultural brands over the past 30 years in China. Today, the green food industry enters a steady-growth stage in terms of cultivation area, product number and sales. This article summarizes the history of the development of green food in China and current achievements, analyze major challenges that may hamper further development of the industry, and propose strategies to address these challenges, i.e., optimization of the food supply chain, deep food processing, and utilization of food wastes.

Keywords： green food     food losses     storage     processing     transportation     sustainability    

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Review on drivers, trends and emerging issues of the food wastage in China

Lin MA,Wei QIN,Tara GARNETT,Fusuo ZHANG

Frontiers of Agricultural Science and Engineering 2015, Volume 2, Issue 2,   Pages 159-167 doi: 10.15302/J-FASE-2015066

Abstract: successfully achieved food self-sufficiency over the past 50 years, however, with large inputs and losses

Keywords： food security     food chain     food wastes and losses     environmental impacts    

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Deviation correction strategy for the earth pressure balance shield based on shield–soil interactions

Frontiers of Mechanical Engineering 2022, Volume 17, Issue 2, doi: 10.1007/s11465-022-0676-4

Abstract: decision-making approach for the deviation correction trajectory and posture rectification load for an earth pressure

Keywords： additional position change     deviation correction trajectory     earth pressure balance shield     mechanical    

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Title Author Date Type Operation

Numerical study of internal flow field and flow passage improvement of an inlet particle separator

Florian PAOLI, Tong WANG

Journal Article

Development of an analytical model to estimate the churning losses in high-speed axial piston pumps

Journal Article

NUTRIENT USE EFFICIENCY AND LOSSES OF INDUSTRIAL FARMS AND MIXED SMALLHOLDINGS: LESSONS FROM THE NORTH

Journal Article

HOTSPOTS OF NUTRIENT LOSSES TO AIR AND WATER: AN INTEGRATED MODELING APPROACH FOR EUROPEAN RIVER BASINS

Journal Article

GASEOUS REACTIVE NITROGEN LOSSES FROM ORCHARDS, VEGETABLES AND TEA PLANTATIONS

Journal Article

Exergy losses in premixed flames of dimethyl ether and hydrogen blends

Tongbin ZHAO, Jiabo ZHANG, Dehao JU, Zhen HUANG, Dong HAN

Journal Article

Test investigation on hydraulic losses in the discharge passage of an axial-flow pump

QIU Baoyun, CAO Haihong, JIANG Wei, GAO Zhaohui, WANG Fei

Journal Article

Development and testing of a weather-based model to determine potential yield losses caused by potato

Alexey FILIPPOV, Maria KUZNETSOVA, Alexander ROGOZHIN, Olga IAKUSHEVA, Valentina DEMIDOVA, Natalia STATSYUK

Journal Article

CLIMATE-CHANGE-INDUCED TEMPORAL VARIATION IN PRECIPITATION INCREASES NITROGEN LOSSES FROM INTENSIVE CROPPING

Journal Article

Numerical study of conduction and radiation heat losses from vacuum annulus in parabolic trough receivers

Dongqiang LEI, Yucong REN, Zhifeng WANG

Journal Article

NUTRIENT USE EFFICIENCY AND LOSSES OF INDUSTRIAL FARMS AND MIXED SMALLHOLDINGS: LESSONS FROM THE NORTH

Yifei MA, Ling ZHANG, Zhaohai BAI, Rongfeng JIANG, Yong HOU, Lin MA

Journal Article

Optimal Su-Do-Ku based interconnection scheme for increased power output from PV array under partial shading conditions

P. SRINIVASA RAO,P. DINESH,G. SARAVANA ILANGO,C. NAGAMANI

Journal Article

Development and challenges of green food in China

Mahmood ul HASSAN, Xin WEN, Jiuliang XU, Jiahui ZHONG, Xuexian LI

Journal Article

Review on drivers, trends and emerging issues of the food wastage in China

Lin MA,Wei QIN,Tara GARNETT,Fusuo ZHANG

Journal Article

Deviation correction strategy for the earth pressure balance shield based on shield–soil interactions

Journal Article