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Maximizing power saving with state transition overhead for multiple mobile subscriber stations in WiMAX Article

Bo LI,Sung-kwon PARK

Frontiers of Information Technology & Electronic Engineering 2016, Volume 17, Issue 10,   Pages 1085-1094 doi: 10.1631/FITEE.1500314

Abstract: In the IEEE 802.16e/m standard, three power saving classes (PSCs) are defined to save the energy of aThus, many algorithms were proposed to set the PSCs in IEEE 802.16 networks.

Keywords： Power saving class     State transition overhead     IEEE 802.16e/m     Quality of service    

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Minimum Reserved Traffic Rate Based Fair Scheduling Algorithm in IEEE 802.16e

Shi Juncai,Hu Aiqun,Guan Yanfeng

Strategic Study of CAE 2008, Volume 10, Issue 2,   Pages 54-59

Abstract:

According to the characteristics of IEEE 802.16-2005, a minimum reserved traffic rate based fair scheduling algorithm in IEEE 802.16-2005 is proposed in this paper.A compensation strategy is introduced to ensure m inimum reserved traffic rate of service which is inAt th e same time, services which have higher priority and are in good channel conditi on are grantedmore bandwidth to ensure the QoS (quality of service) and maximiz e the throughput performance.

Keywords： IEEE 802-16-2005     scheduling algorithm     QoS     fairness    

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IEEE 802.16 Mesh Network SA Management Mechanism Based on Multi-hops Mutual Authentication

Wang Xingjian,Hu Aiqun,Huang Yuhua

Strategic Study of CAE 2006, Volume 8, Issue 9,   Pages 69-73

Abstract:

Mesh network supported by IEEE802.16-2004 wireless-MAN standard is a fresh network combining tree

Keywords： IEEE 802.16     mesh     node     multi-hops mutual authentication     self-modified routing    

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Engineering for Inclusion: Empowering Individuals with Physical and Neurological Differences through Engineering Invention, Research, and Development

Cummings, Philippe M. Fauchet, Michael Goldfarb, Martha W.M. Jones, Maithilee Kunda, Jonathan B.Stassun, Zachary E. Warren, Karl E. Zelik

Engineering 2021, Volume 7, Issue 2,   Pages 141-143 doi: 10.1016/j.eng.2020.06.020

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Performance, emission and combustion characteristics of CI engine fuelled with diesel and hydrogen

Senthil KUMAR,M. LOGANATHAN,E. James GUNASEKARAN

Frontiers in Energy 2015, Volume 9, Issue 4,   Pages 486-494 doi: 10.1007/s11708-015-0368-4

Abstract: Hydrogen (H ) is being considered as a primary automotive fuel and as a replacement for conventional fuels. Some of the desirable properties, like high flame velocity, high calorific value motivate us to use hydrogen fuel as a dual fuel mode in diesel engine. In this experiment, hydrogen was inducted in the inlet manifold with intake air. The experiments were conducted on a four stroke, single cylinder, water cooled, direct injection (DI), diesel engine at a speed of 1500 r/min. Hydrogen was stored in a high pressure cylinder and supplied to the inlet manifold through a water-and-air-based flame arrestor. A pressure regulator was used to reduce the cylinder pressure from 140 bar to 2 bar. The hydrogen was inducted with a volume flow rate of 4l pm, 6l pm and 8l pm, respectively by a digital volume flow meter. The engine performance, emission and combustion parameters were analyzed at various flow rates of hydrogen and compared with diesel fuel operation. The brake thermal efficiency (BTE) was increased and brake specific fuel consumption (BSFC) decreased for the hydrogen flow rate of 8l pm as compared to the diesel and lower volume flow rates of hydrogen. The hydrocarbon (HC) and carbon monoxide (CO) were decreased and the oxides of nitrogen (NO ) increased for higher volume flow rates of hydrogen compared to diesel and lower volume flow rates of hydrogen. The heat release rate and cylinder pressure was increased for higher volume flow rates of hydrogen compared to diesel and lower volume flow rates of hydrogen.

Keywords： hydrogen     brake thermal efficiency     crank angle     compressed ignition (CI)    

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Transactive Demand Response Operation at the Grid Edge using the IEEE 2030.5 Standard Article

Javad Fattahi, Mikhak Samadi, Melike Erol-Kantarci, Henry Schriemer

Engineering 2020, Volume 6, Issue 7,   Pages 801-811 doi: 10.1016/j.eng.2020.06.005

Abstract: comprehensive TDR use case that is fully compliant with the Institute of Electrical and Electronics Engineers (IEEEextended time period, we engage in multiple TDR scenarios, and demonstrate with a fully-functional IEEE

Keywords： Transactive demand response     IEEE 2030.5     Smart grid     Multi-agent system     Neighborhood coordination    

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Oxidative leaching kinetics of molybdenum-uranium ore in H

Lasheen, M. E. El-Ahmady, H. B. Hassib, A. S. Helal

Frontiers of Chemical Science and Engineering 2013, Volume 7, Issue 1,   Pages 95-102 doi: 10.1007/s11705-013-1317-6

Abstract: The optimum process operating parameters were: temperature: 95°C; H O concentration: 0.5 M; sulfuricacid concentration: 2.5 M; time: 2 h; particle size: 74 μm, liquid-to-solid ratio: 14 ∶ 1 and agitation

Keywords： leaching of molybdenum     leaching of uranium     kinetics    

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Integrating space and time: a case for phenological context in grazing studies and management

Dawn M. BROWNING, Sheri SPIEGAL, Richard E. ESTELL, Andres F. CIBILS, Raul H. PEINETTI

Frontiers of Agricultural Science and Engineering 2018, Volume 5, Issue 1,   Pages 44-56 doi: 10.15302/J-FASE-2017193

Abstract: In water-limited landscapes, patterns in primary production are highly variable across space and time. Livestock grazing is a common agricultural practice worldwide and a concern is localized overuse of specific pasture resources that can exacerbate grass losses and soil erosion. On a research ranch in New Mexico with average annual rainfall of 217 mm, we demonstrate with a quantitative approach that annual seasons vary greatly and examine foraging patterns in Angus-Hereford ( ) cows. We define five seasonal stages based on MODIS NDVI: pre-greenup, greenup, peak green, drydown and dormant, and examine livestock movements in 2008. Daily distance traveled by cows was greater and foraging area expanded during periods with higher precipitation. A regression model including minimum NDVI, rainfall and their interaction explained 81% of the seasonal variation in distance traveled by cows ( <0.01). Cows explored about 81 ha·d while foraging, but tended to explore smaller areas as the pasture became greener (greenup and peak green stages). Cows foraged an average of 9.7 h daily and spent more time foraging with more concentrated search patterns as pastures became greener. Our findings suggest that phenological context can expand the capacity to compare and integrate findings, and facilitate meta-analyses of grazing studies conducted at different locations and times of year.

Keywords： GPS collars     Jornada Experimental Range     land-surface phenology     livestock movement     LTAR     MODIS NDVI     rangeland    

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A simple, azulene-based colorimetric probe for the detection of nitrite in water

Murfin, Carlos M. López-Alled, Adam C. Sedgwick, Jannis Wenk, Tony D. James, Simon E. Lewis

Frontiers of Chemical Science and Engineering 2020, Volume 14, Issue 1,   Pages 90-96 doi: 10.1007/s11705-019-1790-7

Abstract: We describe the synthesis and evaluation of an azulene-based chemodosimeter for nitrite. The probe was found to undergo two distinct color changes upon introduction aqueous nitrite ion. A near-instant formation of a grey color provides a qualitative indication of the presence of nitrite, followed by the formation of a deep-yellow/orange color, the endpoint from which quantitative data can be derived. The azulene probe exhibits 1:1 stoichiometry of reaction with nitrite in water, and is selective for nitrite over other anions. The azulene probe was applied to determine nitrite content in cured meat, and compared with the British Standard testing procedure (Griess test). The value obtained from the azulene-based probe agreed closely with the standard test. Our procedure only requires the preparation of one standard solution, instead of the three required for the standard Griess test.

Keywords： azulene     nitrite     diazoquinone    

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SUSTAINABLE DEVELOPMENT OF CROP-LIVESTOCK FARMS IN AFRICA

ONYANGO, Ousmane M. SANOGO, Ibrahim WANYAMA, Gabriel YESUF, David E. PELSTER

Frontiers of Agricultural Science and Engineering 2021, Volume 8, Issue 1,   Pages 175-181 doi: 10.15302/J-FASE-2020362

Abstract: Crop-livestock farms across Africa are highly variable due to in agroecological and socioeconomic factors, the latter shaping the demand and supply of livestock products. Crop-livestock farms in Africa in the 21st century are very different from most mixed farms elsewhere in the world. African crop-livestock farms are smaller in size, have fewer livestock, lower productivity and less dependency on imported feed than farms in most countries of Europe, the Americas and the intensive agricultural systems of Asia. This paper discusses the role African crop-livestock farms have in the broader socio-agricultural economy, and how these are likely to change adapting to pressures brought on by the intensification of food systems. This intensification implies increasing land productivity (more food per hectare), often leading to more livestock heads per farm, producing fertilized feeds in croplands and importing feed supplements from the market. This discussion includes (1) the links between crop yields, soil fertility and crop-livestock integration, (2) the increasing demand for livestock products and the land resources required to meet to this demand, and (3) the opportunities to integrate broader societal goals into the development of crop-livestock farms. There is ample room for development of crop-livestock farms in Africa, and keeping integration as part of the development will help prevent many of the mistakes and environmental problems related to the intensification of livestock production observed elsewhere in the world. This development can integrate biodiversity, climate change adaptation and mitigation to the current goals of increasing productivity and food security. The inclusion of broader goals could help farmers access the level of finance required to implement changes.
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Highly active and durable Pd-Cu catalysts for oxygen reduction in alkaline exchange membrane fuel cells

OMASTA, Justin M. ROLLER, William E. MUSTAIN

Frontiers in Energy 2017, Volume 11, Issue 3,   Pages 299-309 doi: 10.1007/s11708-017-0495-1

Abstract: A Pd-Cu catalyst, with primary B2-type phase, supported by VulcanXC-7R carbon was synthesized via a solvothermal method. The catalysts were physically and electrochemically characterized by X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), transmission electron microscopy (TEM) and both cyclic and linear sweep voltammetry using a rotating disk electrode (RDE). During the RDE testing, the half-wave potential of the Pd-Cu/Vulcan catalyst was 50 mV higher compared to that of commercial Pt/C catalyst for the oxygen reduction reaction (ORR) in alkaline media. The Pd-Cu/Vulcan exhibited a specific activity of 1.27 mA/cm and a mass activity of 0.59 A/mg at 0.9 V, which were 4 and 3 times greater than that of the commercial Pt/C catalyst, respectively. The Pd-Cu/Vulcan catalyst also showed higher alkaline exchange membrane fuel cell (AEMFC) performance, with operating power densities of 1100 MW/cm operating on H /O and 700 MW/cm operating on H /Air (CO -free), which were markedly higher than those of the commercial Pt/C. The Pd-Cu/Vulcan catalyst also exhibited high stability during a short-term, AEMFC durability test, with only around 11% performance loss after 30 hours of operation, an improvement over most AEMFCs reported in the literature to date.

Keywords： alkaline exchange membrane (AEM)     fuel cell     Pd-Cu     oxygen reduction     high performance     water    

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Efficient Nanostructuring of Isotropic Gas-Atomized MnAl Powder by Rapid Milling (30 s) Article

Rial, E.M. Palmero, A. Bollero

Engineering 2020, Volume 6, Issue 2,   Pages 172-176 doi: 10.1016/j.eng.2019.03.013

Abstract: A coercivity as high as 4.2 kOe (1 Oe = 79.6 A·m-1 ) was obtained after milling (30

Keywords： Permanent magnets (PMs)     Nanostructuring     Phase transformation     MnAl     Gas atomization     Ball milling    

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Effects of ambient temperature on regulated gaseous and particulate emissions from gasoline-, E10- andM15-fueled vehicles

Rencheng Zhu, Jingnan Hu, Liqiang He, Lei Zu, Xiaofeng Bao, Yitu Lai, Sheng Su

Frontiers of Environmental Science & Engineering 2021, Volume 15, Issue 1, doi: 10.1007/s11783-020-1306-1

Abstract: Abstract • Emissions from two sedans were tested with gasoline, E10 and M15 at 30°C and -7°C. • As theAt 30°C, the BC emissions were lower with E10 and M15 than with gasoline in most cases, but E10 and M15might emit more BC than gasoline at -7°C, especially M15.Overall, the particulate emissions with E10 and M15 were more easily affected by ambient temperature,and the advantages of E10 and M15 in controlling particulate emissions declined as the ambient temperature

Keywords： Particle mass     Particle number     Black carbon     Alcohol gasoline     Low temperature    

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Experimental evaluation and simulation of volumetric shrinkage and warpage on polymeric composite short natural fibers reinforced injection molded

GARCÍA,Luis E. GARZÓN,Luis M. LÓPEZ

Frontiers of Mechanical Engineering 2015, Volume 10, Issue 3,   Pages 287-293 doi: 10.1007/s11465-015-0346-x

Abstract:

A polymeric natural fiber-reinforced composite is developed by extrusion and injection molding process. The shrinkage and warpage of high-density polyethylene reinforced with short natural fibers of Guadua angustifolia Kunth are analyzed by experimental measurements and computer simulations. Autodesk Moldflow® and Solid Works® are employed to simulate both volumetric shrinkage and warpage of injected parts at different configurations: 0 wt.%, 20 wt.%, 30 wt.% and 40 wt.% reinforcing on shrinkage and warpage behavior of polymer composite. Become evident the restrictive effect of reinforcing on the volumetric shrinkage and warpage of injected parts. The results indicate that volumetric shrinkage of natural composite is reduced up to 58% with fiber increasing, whereas the warpage shows a reduction form 79% to 86% with major fiber content. These results suggest that it is a highly beneficial use of natural fibers to improve the assembly properties of polymeric natural fiber-reinforced composites.

Keywords： biocomposite     natural fiber     shrinkage     simulation     warpage    

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A cooperative heterogeneous vehicular clustering framework for efficiency improvement Research Articles

Iftikhar Ahmad, Rafidah Md Noor, Zaheed Ahmed, Umm-e-Habiba, Naveed Akram, Fausto Pedro García Márquez

Frontiers of Information Technology & Electronic Engineering 2021, Volume 22, Issue 9,   Pages 1247-1259 doi: 10.1631/FITEE.2000260

Abstract: Heterogeneous ing integrates multiple types of communication networks to work efficiently for various vehicular applications. One popular form of heterogeneous network is the integration of long-term evolution (LTE) and dedicated short-range communication. The of such a network infrastructure and the non- involved in sharing cost/data are potential problems to solve. A ing framework is one solution to these problems, but the framework should be formally verified and validated before being deployed in the real world. To solve these issues, first, we present a heterogeneous framework, named destination and interest-aware clustering, for ing that integrates vehicular ad hoc networks with the LTE network for improving road traffic efficiency. Then, we specify a model system of the proposed framework. The model is formally verified to evaluate its performance at the functional level using a model checking technique. To evaluate the performance of the proposed framework at the micro-level, a heterogeneous simulation environment is created by integrating state-of-the-art tools. The comparison of the simulation results with those of other known approaches shows that our proposed framework performs better.

Keywords： 车辆集群；异构性；协同；形式验证；系统模型    

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Title Author Date Type Operation

Maximizing power saving with state transition overhead for multiple mobile subscriber stations in WiMAX

Bo LI,Sung-kwon PARK

Journal Article

Minimum Reserved Traffic Rate Based Fair Scheduling Algorithm in IEEE 802.16e

Shi Juncai,Hu Aiqun,Guan Yanfeng

Journal Article

IEEE 802.16 Mesh Network SA Management Mechanism Based on Multi-hops Mutual Authentication

Wang Xingjian,Hu Aiqun,Huang Yuhua

Journal Article

Engineering for Inclusion: Empowering Individuals with Physical and Neurological Differences through Engineering Invention, Research, and Development

Cummings, Philippe M. Fauchet, Michael Goldfarb, Martha W.M. Jones, Maithilee Kunda, Jonathan B.Stassun, Zachary E. Warren, Karl E. Zelik

Journal Article

Performance, emission and combustion characteristics of CI engine fuelled with diesel and hydrogen

Senthil KUMAR,M. LOGANATHAN,E. James GUNASEKARAN

Journal Article

Transactive Demand Response Operation at the Grid Edge using the IEEE 2030.5 Standard

Javad Fattahi, Mikhak Samadi, Melike Erol-Kantarci, Henry Schriemer

Journal Article

Oxidative leaching kinetics of molybdenum-uranium ore in H

Lasheen, M. E. El-Ahmady, H. B. Hassib, A. S. Helal

Journal Article

Integrating space and time: a case for phenological context in grazing studies and management

Dawn M. BROWNING, Sheri SPIEGAL, Richard E. ESTELL, Andres F. CIBILS, Raul H. PEINETTI

Journal Article

A simple, azulene-based colorimetric probe for the detection of nitrite in water

Murfin, Carlos M. López-Alled, Adam C. Sedgwick, Jannis Wenk, Tony D. James, Simon E. Lewis

Journal Article

SUSTAINABLE DEVELOPMENT OF CROP-LIVESTOCK FARMS IN AFRICA

ONYANGO, Ousmane M. SANOGO, Ibrahim WANYAMA, Gabriel YESUF, David E. PELSTER

Journal Article

Highly active and durable Pd-Cu catalysts for oxygen reduction in alkaline exchange membrane fuel cells

OMASTA, Justin M. ROLLER, William E. MUSTAIN

Journal Article

Efficient Nanostructuring of Isotropic Gas-Atomized MnAl Powder by Rapid Milling (30 s)

Rial, E.M. Palmero, A. Bollero

Journal Article

Effects of ambient temperature on regulated gaseous and particulate emissions from gasoline-, E10- andM15-fueled vehicles

Rencheng Zhu, Jingnan Hu, Liqiang He, Lei Zu, Xiaofeng Bao, Yitu Lai, Sheng Su

Journal Article

Experimental evaluation and simulation of volumetric shrinkage and warpage on polymeric composite short natural fibers reinforced injection molded

GARCÍA,Luis E. GARZÓN,Luis M. LÓPEZ

Journal Article

A cooperative heterogeneous vehicular clustering framework for efficiency improvement

Iftikhar Ahmad, Rafidah Md Noor, Zaheed Ahmed, Umm-e-Habiba, Naveed Akram, Fausto Pedro García Márquez

Journal Article