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A novel approach for remanufacturing process planning considering uncertain and fuzzy information

Frontiers of Mechanical Engineering 2021, Volume 16, Issue 3,   Pages 546-558 doi: 10.1007/s11465-021-0639-1

Abstract: The solution is provided through an improved Takagi–Sugeno fuzzy neural network (T-S FNN) method.Results show that the training speed and accuracy of the improved T-S FNN method are 23.5% and 82.5%

Keywords: remanufacturing     uncertain and fuzzy information     process planning     T-S FNN    

Predictive Functional Control Based on Fuzzy Model for HVAC Systems

Lu Hongli,Jia Lei,Wang Lei,Gao Rui

Strategic Study of Chinese Academy of Engineering 2006, Volume 8, Issue 9,   Pages 65-68

Abstract: The T - S fuzzy model of controlled process was obtained using the least squares method, then basingon the fuzzy T - S global linear predictive model, the process was controlled by the predictive functional

Keywords: T-S fuzzy model     predictive functional control     least squares method     HVAC systems    

Classical state feedback controller for nonlinear systems using mean value theorem: closed loop-FOC of PMSM motor application

Abrar ALLAG,Abdelhamid BENAKCHA,Meriem ALLAG,Ismail ZEIN,Mohamed Yacine AYAD

Frontiers in Energy 2015, Volume 9, Issue 4,   Pages 413-425 doi: 10.1007/s11708-015-0379-1

Abstract: The problem of state feedback controllers for a class of Takagi-Sugeno (T-S) Lipschitz nonlinear systems

Keywords: Takagi-Sugeno (T-S) fuzzy systems     sector nonlinearity     nonlinear controller     linear matrix inequality (    

Finite element analysis and structural design of pretensioned inverted T-beams with web openings

Hock Tian CHENG, Bashar S. MOHAMMED, Kamal Nasharuddin MUSTAPHA

Frontiers of Structural and Civil Engineering 2009, Volume 3, Issue 2,   Pages 148-157 doi: 10.1007/s11709-009-0030-5

Abstract: project aimed at providing standard circular web openings to the popular precast pretensioned inverted T-beamIn this paper the nonlinear analysis and design of simply supported pretensioned inverted T-beam withnonlinear finite element analysis were substantiated by test results from five pretensioned inverted T-beamsA simple design method for pretensioned inverted T-beam with circular web openings is proposed.

Keywords: prestressed concrete     inverted-T beam     web opening    

Ultimate load analysis of pretensioned inverted T-beams with circular web openings

Hock Tian CHENG , Bashar S. MOHAMMED , Kamal Nasharuddin MUSTAPHA ,

Frontiers of Structural and Civil Engineering 2009, Volume 3, Issue 3,   Pages 262-271 doi: 10.1007/s11709-009-0031-4

Abstract: In this paper, ultimate load analysis of statically loaded simply supported pretensioned inverted T-beams

Keywords: pretensioned inverted T-beam     web opening    

Thermal-aware relocation of servers in green data centers

Muhammad Tayyab CHAUDHRY,T. C. LING,S. A. HUSSAIN,Xin-zhu LU

Frontiers of Information Technology & Electronic Engineering 2015, Volume 16, Issue 2,   Pages 119-134 doi: 10.1631/FITEE.1400174

Abstract: Rise in inlet air temperature increases the corresponding outlet air temperature from the server. As an added effect of rise in inlet air temperature, some active servers may start exhaling intensely hot air to form a hotspot. Increase in hot air temperature and occasional hotspots are an added burden on the cooling mechanism and result in energy wastage in data centers. The increase in inlet air temperature may also result in failure of server hardware. Identifying and comparing the thermal sensitivity to inlet air temperature for various servers helps in the thermal-aware arrangement and location switching of servers to minimize the cooling energy wastage. The peak outlet temperature among the relocated servers can be lowered and even be homogenized to reduce the cooling load and chances of hotspots. Based upon mutual comparison of inlet temperature sensitivity of heterogeneous servers, this paper presents a proactive approach for thermal-aware relocation of data center servers. The experimental results show that each relocation operation has a cooling energy saving of as much as 2.1 kW·h and lowers the chances of hotspots by over 77%. Thus, the thermal-aware relocation of servers helps in the establishment of green data centers.

Keywords: Servers     Green data center     Thermal-aware     Relocation    

Thermal degradation characteristics and products obtained after pyrolysis of specific polymers found in Waste Electrical and Electronic Equipment

Vouvoudi, Aristea T. Rousi, Dimitris S. Achilias

Frontiers of Environmental Science & Engineering 2017, Volume 11, Issue 5, doi: 10.1007/s11783-017-0996-5

Abstract: Modern societies strongly support the recycling practices over simple waste accumulation due to environmental harm caused. In the framework of sustainable recycling of plastics from WEEE, pyrolysis is proposed here as a means of obtaining secondary value-added products. The aim of this study was to investigate the thermal degradation and the products obtained after pyrolysis of specific polymers found in the plastic part of WEEE, using thermogravimetric analysis and a pyrolizer equipped with a GC/MS. Polymers studied include ABS, HIPS, PC and a blend having a composition similar to that appearing in WEEE. It was found that, PC shows greater heat endurance compared to the other polymers, whereas ABS depolymerizes in three-steps. The existence of several polymers in the blend results in synergistic effects which decrease the onset and final temperature of degradation. Moreover, the fragmentation occurred in the pyrolyzer, at certain temperatures, resulted in a great variety of compounds, depending on the polymer type, such as monomers, aromatic products, phenolic compounds and hydrocarbons. The main conclusion from this investigation is that pyrolysis could be an effective method for the sustainable recycling of the plastic part of WEEE resulting in a mixture of chemicals with varying composition but being excellent to be used as fuel retrieved from secondary recycling sources.

Keywords: Pyrolysis     WEEE recycling     ABS     HIPS     PC     Py-GC/MS     TGA    

A boronic acid-based fluorescent hydrogel for monosaccharide detection

Elfeky, Wenbo Chen, Ashley S. Jones, George T. Williams, A. Toby A. Jenkins, Steven D.Bull, John S. Fossey, Tony D. James

Frontiers of Chemical Science and Engineering 2020, Volume 14, Issue 1,   Pages 112-116 doi: 10.1007/s11705-019-1812-5

Abstract: A boronic acid-based anthracene fluorescent probe was functionalised with an acrylamide unit to incorporate into a hydrogel system for monosaccharide detection In solution, the fluorescent probe displayed a strong fluorescence turn-on response upon exposure to fructose, and an expected trend in apparent binding constants, as judged by a fluorescence response where D-fructose>D-galactose>D-mannose>D-glucose. The hydrogel incorporating the boronic acid monomer demonstrated the ability to detect monosaccharides by fluorescence with the same overall trend as the monomer in solution with the addition of D-fructose resulting in a 10-fold enhancement (≤0.25 mol/L).

Optimal placement of wind turbines within a wind farm considering multi-directional wind speed using two-stage genetic algorithm

A.S.O. OGUNJUYIGBE, T.R. AYODELE, O.D. BAMGBOJE

Frontiers in Energy 2021, Volume 15, Issue 1,   Pages 240-255 doi: 10.1007/s11708-018-0514-x

Abstract: Most wind turbines within wind farms are set up to face a pre-determined wind direction. However, wind directions are intermittent in nature, leading to less electricity production capacity. This paper proposes an algorithm to solve the wind farm layout optimization problem considering multi-angular (MA) wind direction with the aim of maximizing the total power generated on wind farms and minimizing the cost of installation. A two-stage genetic algorithm (GA) equipped with complementary sampling and uniform crossover is used to evolve a MA layout that will yield optimal output regardless of the wind direction. In the first stage, the optimal wind turbine layouts for 8 different major wind directions were determined while the second stage allows each of the previously determined layouts to compete and inter-breed so as to evolve an optimal MA wind farm layout. The proposed MA wind farm layout is thereafter compared to other layouts whose turbines have focused site specific wind turbine orientation. The results reveal that the proposed wind farm layout improves wind power production capacity with minimum cost of installation compared to the layouts with site specific wind turbine layouts. This paper will find application at the planning stage of wind farm.

Keywords: optimal placement     wind turbines     wind direction     genetic algorithm     wake effect    

Plated contacts for solar cells with superior adhesion strength to screen printed solar cells

CHEN,S. WANG,A. WENHAM,Z. SHI,T. YOUNG,J. JI,M. EDWARDS,A. SUGIANTO,L. MAI,S. WENHAM,C. CHONG

Frontiers in Energy 2017, Volume 11, Issue 1,   Pages 72-77 doi: 10.1007/s11708-016-0428-4

Abstract: The improvement of adhesion strength and durability of plated contacts is required for cell manufacturers to gain confidence for large-scale manufacturing. To overcome weak adhesion at the metal/Si interface, new approaches were developed. These involve the formation of laser-ablated anchor points, or grooves in the extreme case of overlapping anchor points, in the heavily doped silicon surface. When plated, these features greatly strengthen the mechanical adhesion strength of the metal. A stylus-based adhesion tester was developed specifically for evaluating the effectiveness of plated contacts to smooth silicon surfaces. The use of such a tester was also extended in this work to textured and roughened surfaces to allow evaluation of different metal contacting approaches. The adhesion strengths for various metal contacting schemes were evaluated, including screen-printed silver contacts, nickel/copper (Ni/Cu) light-induced plated (LIP) contacts for laser-doped selective emitter (LDSE) cells, buried-contact solar cells (BCSCs), and Ni/Cu LIP contacts formed with laser-ablated anchoring points in selective emitter (LAASE) cells. The latter has superior adhesion strength. The standard “peel test” of the industry was compared to the stylus-based adhesion testing, with the latter shown value for testing metal contacts on smooth surfaces but with caution needed for use with textured or roughened surfaces.

Keywords: light-induced plating     metal adhesion strength     copper plating     metal contacts     solar cell durability     silicon solar cells    

Characterization and seasonal distribution of microplastics in the nearshore sediments of the south-east coast of India, Bay of Bengal

Sambandam , S. K. Sivadas , T.

Frontiers of Environmental Science & Engineering 2022, Volume 16, Issue 1,   Pages 10-10 doi: 10.1007/s11783-021-1444-0

Abstract:

In view of increasing Microplastics (MPs) contamination in the marine environment and dearth of baseline data, a study was conducted on the abundance, characterization, and seasonal distribution of MPs in the nearshore sediments of the south-east coast of India. Sediment samples (n = 130) were collected at a distance of 1 km and 10 km from the shore region at varying depths (8–45 m) along the Chennai to Puducherry coast (165 km stretch), representing two seasons, i.e., south-west (July 2019 and July 2020) and north-east (January 2020) monsoons. The average abundance of MPs at the 22 offshore sites along the Chennai to Puducherry coast varied from 9±4.3 to 19±12.9 particles/50 g dry weight, in July 2019 and January 2020, respectively. July 2020 had an average abundance of 10±4.5 particles/50 g dry weight. Spatially, high levels of MPs were found at 1km stations and transects in proximity to the river inlets, and temporally, the north-east month recorded the maximum concentration. The dominant morphotype was the filament, and the major polymers were polyethylene and polypropylene. Scanning Electron Microscope (SEM) images revealed the surface irregularity and degradation of MPs due to weathering. The study highlights that high sediment contamination by MPs occurs during heavy rainfall and accumulates closer to river inlets. Eventually, this study suggests that appropriate management of plastic wastes on the landside will reduce MP contamination in the marine environment.

Synthesis of a cardanol-amine derivative using an ionic liquid catalyst

Alves, Maria T. S. Trevisan, Roseane L. E. da Silva, Roselayne F. Furtado, Zengshe Liu, H. N. Cheng

Frontiers of Chemical Science and Engineering 2016, Volume 10, Issue 3,   Pages 425-431 doi: 10.1007/s11705-016-1581-3

Abstract: Cardanol is a biobased raw material derived from cashew nut shell liquid. In order to extend its utility, new derivatives and additional applications are useful. In this work cardanol was first epoxidized, and a novel aniline derivative prepared from it under mild reaction conditions with the help of an ionic liquid catalyst. The reaction chemistry was studied by using nuclear magnetic resonance. The resulting aminohydrin adduct showed antioxidant property and should also be a useful synthon for further reactions. As an example, the aminohydrin was shown to undergo a condensation reaction with formaldehyde to form a prepolymer, which could be further reacted to form thermosetting resins.

Keywords: cardanol     epoxidation     aminohydrin     aniline     ionic liquid     aniline-formaldehyde    

Enhancing the Surface Properties of a Bioengineered Anterior Cruciate Ligament Matrix for Use with Point-of-Care Stem Cell Therapy Article

Mengsteab, Ganesh Narayanan, Lakshmi S. Nair, Cato T. Laurencin

Engineering 2021, Volume 7, Issue 2,   Pages 153-161 doi: 10.1016/j.eng.2020.02.010

Abstract:

We have previously developed a poly(L-lactic) acid (PLLA) bioengineered anterior cruciate ligament (ACL) matrix that has demonstrated enhanced healing when seeded with primary ACL cells prior to implantation in a rabbit model, as compared with the matrix alone. This suggests that improving cell adhesion on the matrix may beneficially affect the healing response and long-term performance of the bioengineered ACL matrix. One regenerative engineering approach involves enhancing the surface properties of the matrix to support cell adhesion and growth in combination with point-of-care stem cell therapy. Herein, we studied the cell adhesion properties of PLLA braided microfiber matrices enhanced through the physical adsorption of fibronectin and air plasma treatment. We evaluated the kinetics and binding efficiency of fibronectin onto matrices at three time points and three fibronectin concentrations. Incubating the matrix for 120 min in a solution of 25 μg·mL−1 fibronectin achieved the greatest binding efficiency to the matrix and cellular adhesion. Exposing the matrices to air plasma treatment for 5 min before fibronectin adsorption significantly enhanced the cell adhesion of rabbit bone marrow-derived mesenchymal stem cells (R-BMMSCs) 24 h post cell seeding. Finally, cellular proliferation was monitored for up to 21 d, the matrices were exposed to air plasma treatment, and fibronectin adsorption was found to result in enhanced cell number. These findings suggest that exposure to air plasma treatment and fibronectin adsorption enhances the cellular adhesion of PLLA braided microfiber matrices and may improve the clinical efficacy of the matrix in combination with point-of-care stem cell therapies.

Keywords: Anterior cruciate ligament     Ligament Poly(L-lactic) acid plasma treatment     Fibronectin     Stem cells     Adhesion    

Regenerative Engineering for Knee Osteoarthritis Treatment: Biomaterials and Cell-Based Technologies

Escobar Ivirico, Maumita Bhattacharjee, Emmanuel Kuyinu, Lakshmi S. Nair, Cato T. Laurencin

Engineering 2017, Volume 3, Issue 1,   Pages 16-27 doi: 10.1016/J.ENG.2017.01.003

Abstract:

Knee osteoarthritis (OA) is the most common form of arthritis worldwide. The incidence of this disease is rising and its treatment poses an economic burden. Two early targets of knee OA treatment include the predominant symptom of pain, and cartilage damage in the knee joint. Current treatments have been beneficial in treating the disease but none is as effective as total knee arthroplasty (TKA). However, while TKA is an end-stage solution of the disease, it is an invasive and expensive procedure. Therefore, innovative regenerative engineering strategies should be established as these could defer or annul the need for a TKA. Several biomaterial and cell-based therapies are currently in development and have shown early promise in both preclinical and clinical studies. The use of advanced biomaterials and stem cells independently or in conjunction to treat knee OA could potentially reduce pain and regenerate focal articular cartilage damage. In this review, we discuss the pathogenesis of pain and cartilage damage in knee OA and explore novel treatment options currently being studied, along with some of their limitations.

Keywords: Knee osteoarthritis     Osteoarthritic pain     Mesenchymal stem cells     Biomaterials     Regenerative engineering    

Tracking of safety hazards and real-time-prediction model of safety risks on construction sites

Wu Weiwei,Patrick T. I. LAM,Li Qiming,Michael C. H. YAM,David A. S. CHEW

Strategic Study of Chinese Academy of Engineering 2010, Volume 12, Issue 3,   Pages 68-72

Abstract:

This paper aims to explore the tracking approach of safety hazards and real-time-prediction methods of safety risks on construction sites. A literature review of safety issues on construction sites is first conducted. Consequently, a schematic model of tracking safety hazards and real-time prediction of safety risks is formulated and the corresponding methodologies are summarized. This study would provide a possible research approach on method for tracking safety hazards and real-time prediction of safety risks, while serving as a foundation for further study by drawing researchers' attention to the precursor signals of safety hazards on construction sites.

Keywords: construction sites     safety risks     real-time prediction     precursor signals     signal detection theory    

Title Author Date Type Operation

A novel approach for remanufacturing process planning considering uncertain and fuzzy information

Journal Article

Predictive Functional Control Based on Fuzzy Model for HVAC Systems

Lu Hongli,Jia Lei,Wang Lei,Gao Rui

Journal Article

Classical state feedback controller for nonlinear systems using mean value theorem: closed loop-FOC of PMSM motor application

Abrar ALLAG,Abdelhamid BENAKCHA,Meriem ALLAG,Ismail ZEIN,Mohamed Yacine AYAD

Journal Article

Finite element analysis and structural design of pretensioned inverted T-beams with web openings

Hock Tian CHENG, Bashar S. MOHAMMED, Kamal Nasharuddin MUSTAPHA

Journal Article

Ultimate load analysis of pretensioned inverted T-beams with circular web openings

Hock Tian CHENG , Bashar S. MOHAMMED , Kamal Nasharuddin MUSTAPHA ,

Journal Article

Thermal-aware relocation of servers in green data centers

Muhammad Tayyab CHAUDHRY,T. C. LING,S. A. HUSSAIN,Xin-zhu LU

Journal Article

Thermal degradation characteristics and products obtained after pyrolysis of specific polymers found in Waste Electrical and Electronic Equipment

Vouvoudi, Aristea T. Rousi, Dimitris S. Achilias

Journal Article

A boronic acid-based fluorescent hydrogel for monosaccharide detection

Elfeky, Wenbo Chen, Ashley S. Jones, George T. Williams, A. Toby A. Jenkins, Steven D.Bull, John S. Fossey, Tony D. James

Journal Article

Optimal placement of wind turbines within a wind farm considering multi-directional wind speed using two-stage genetic algorithm

A.S.O. OGUNJUYIGBE, T.R. AYODELE, O.D. BAMGBOJE

Journal Article

Plated contacts for solar cells with superior adhesion strength to screen printed solar cells

CHEN,S. WANG,A. WENHAM,Z. SHI,T. YOUNG,J. JI,M. EDWARDS,A. SUGIANTO,L. MAI,S. WENHAM,C. CHONG

Journal Article

Characterization and seasonal distribution of microplastics in the nearshore sediments of the south-east coast of India, Bay of Bengal

Sambandam , S. K. Sivadas , T.

Journal Article

Synthesis of a cardanol-amine derivative using an ionic liquid catalyst

Alves, Maria T. S. Trevisan, Roseane L. E. da Silva, Roselayne F. Furtado, Zengshe Liu, H. N. Cheng

Journal Article

Enhancing the Surface Properties of a Bioengineered Anterior Cruciate Ligament Matrix for Use with Point-of-Care Stem Cell Therapy

Mengsteab, Ganesh Narayanan, Lakshmi S. Nair, Cato T. Laurencin

Journal Article

Regenerative Engineering for Knee Osteoarthritis Treatment: Biomaterials and Cell-Based Technologies

Escobar Ivirico, Maumita Bhattacharjee, Emmanuel Kuyinu, Lakshmi S. Nair, Cato T. Laurencin

Journal Article

Tracking of safety hazards and real-time-prediction model of safety risks on construction sites

Wu Weiwei,Patrick T. I. LAM,Li Qiming,Michael C. H. YAM,David A. S. CHEW

Journal Article