Identification of operational parameter levels that optimize the production in solar stills with plain, corrugated, and compartmental basin

A new method to design in-orbit synthetic aperture radar operational parameters has been implemented for the Korean Multi-purpose Satellite 6 mission. The implemented method optimizes the pulse repetition frequency when a satellite altitude changes from its nominal one, so it has the advantage that the synthetic aperture radar performances can satisfy the requirements for the in-orbit operation. Other commanding parameters have been designed to conduct trade-off between those parameters. This paper presents the new optimization method to maintain the synthetic aperture radar performances even in the case of an altitude variation. Design methodologies to determine operational parameters, respectively, at nominal altitude and in orbit are presented. In addition, numerical simulation is presented to validate the proposed optimization and the design methodologies.

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Evaluating the treatment performance of a full scale Activated Sludge Plant in Islamabad, Pakistan

Water Practice & Technology ◽

10.2166/wpt.2012.016 ◽

2012 ◽

Vol 7 (1) ◽

Cited By ~ 1

Author(s):

S. S. Fatima ◽

S. Jamal Khan

Keyword(s):

Wastewater Treatment ◽

Activated Sludge ◽

Wastewater Treatment Plant ◽

Suspended Solids ◽

Treatment Plant ◽

Oxygen Demand ◽

Full Scale ◽

Operational Parameter ◽

Mixed Liquor ◽

Treatment Performance

In this study, the performance of wastewater treatment plant located at sector I-9 Islamabad, Pakistan, was evaluated. This full scale domestic wastewater treatment plant is based on conventional activated sludge process. The parameters which were monitored regularly included total suspended solids (TSS), mixed liquor suspended solids (MLSS), mixed liquor volatile suspended solids (MLVSS), biological oxygen demand (BOD), and chemical oxygen demand (COD). It was found that the biological degradation efficiency of the plant was below the desired levels in terms of COD and BOD. Also the plant operators were not maintaining consistent sludge retention time (SRT). Abrupt discharge of MLSS through the Surplus Activated sludge (SAS) pump was the main reason for the low MLSS in the aeration tank and consequently low treatment performance. In this study the SRT was optimized based on desired MLSS concentration between 3,000–3,500 mg/L and required performance in terms of BOD, COD and TSS. This study revealed that SRT is a very important operational parameter and its knowledge and correct implementation by the plant operators should be mandatory.

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Evaluation of osmotic energy extraction via FEM modeling and exploration of PRO operational parameter space

Desalination ◽

10.1016/j.desal.2016.09.015 ◽

2017 ◽

Vol 401 ◽

pp. 120-133 ◽

Cited By ~ 2

Author(s):

Abraham Sagiv ◽

Wenyan Xu ◽

Panagiotis D. Christofides ◽

Yoram Cohen ◽

Raphael Semiat

Keyword(s):

Parameter Space ◽

Energy Extraction ◽

Fem Modeling ◽

Operational Parameter

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Synergistic effect of Al2O3/TiO2 reinforcements on slurry erosion performance of nickel-based composite coatings

Proceedings of the Institution of Mechanical Engineers Part J Journal of Engineering Tribology ◽

10.1177/1350650117736487 ◽

2017 ◽

Vol 232 (8) ◽

pp. 974-986 ◽

Cited By ~ 4

Author(s):

Rajeev Kumar ◽

Sanjeev Bhandari ◽

Atul Goyal

Keyword(s):

Electron Microscope ◽

Scanning Electron Microscope ◽

Mass Loss ◽

Erosion Resistance ◽

Slurry Erosion ◽

Specific Mass ◽

Operational Parameter ◽

X Ray ◽

Specific Mass Loss ◽

Scanning Electron

Various aspects such as development, experimentation, and analysis have been covered in the present work to examine the behavior of test coatings under slurry erosion. The primary objective of the present study was to establish the specific mass loss from the test coatings under various slurry environmental conditions and highlights the importance of the addition of alumina in improving the slurry erosion resistance of Ni-TiO2 coating. To attain this objective, two powder compositions, viz. Ni-20TiO2 and Ni-15TiO2-5Al2O3 were deposited onto the CA6NM grade hydro-turbine steel using high velocity frame spray process. The microstructural characterization of the coatings was done by employing surface roughness tester, scanning electron microscope/energy-dispersive X-ray spectroscopy, and X-ray diffraction techniques, whereas mechanical analysis was carried out using micro-hardness and bond strength tester. The slurry erosion tests were performed using an indigenously fabricated high speed slurry erosion test rig at different levels of rotational speed, average particle size of erodent, and slurry concentration in order to explore their effects on slurry erosion performance of test coatings. The slurry erosion results, as well as scanning electron microscope observations of eroded specimens, revealed higher slurry erosion resistance of Ni-15TiO2-5Al2O3 coating in comparison with Ni-20TiO2 coating. Furthermore, each operational parameter was found to have a proportional effect on specific mass loss in case of both the coatings.

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MODIFYING WASTE POLYSTYRENE TO ION EXCHANGE MATERIAL: OPTIMIZING THE SULFONATION PROCESS AND COLUMN STUDY FOR THE REMOVAL OF Cr3+

Vietnam Journal of Science and Technology ◽

10.15625/2525-2518/58/5a/15234 ◽

2020 ◽

Vol 58 (5A) ◽

pp. 150

Author(s):

Thuy Thi Pham ◽

Hung Quoc Nguyen ◽

Khai Manh Nguyen

Keyword(s):

Ion Exchange ◽

Metal Ion ◽

Tap Water ◽

Plastic Waste ◽

Wildlife Habitat ◽

Experimental Result ◽

Model Parameters ◽

Operational Parameter ◽

Waste Polystyrene ◽

Exchange Material

The incredible growth of plastic waste is a major concern for the whole society in recent years. The accumulation of plastic waste has badly effects on wildlife, habitat, and humans. Plastics that act as pollutants are categorized into different sizes, from micro to macro. Disposable plastic waste was collected at the bakery shop and removed the residue food by tap water and NaOH 1M to remove residual food. This study focuses on modify waste plastic by sulfuric acid to bind the sulfonated function group on the structure of the polystyrene chain at room temperature. The sulfonated product was used for removing heavy metal ion in water with the mechanism of the ion exchange process. The prepared ion exchange material was characterized by FTIR and SEM to ensure that the sulfonation process has happened. The chromium (III) ion removal by modified ion exchange product in continuous mode was affected by an operational parameter such as the bed height of sulfonated material. The Yoon-Nelson and Thomas model were used to analyze the experimental result and the model parameters were evaluated. From this result, it can be concluded that with the increasing amount of sulfonated waste polystyrene, exchange capacity, and the time required for a 50% adsorbate breakthrough was higher.

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EFFECT OF OPERATIONAL PARAMETER ON PHOTOCATALYTIC DEGRADATION OF OXAMYL PESTICIDE

International Journal of Engineering Technologies and Management Research ◽

10.29121/ijetmr.v4.i12.2017.595 ◽

2020 ◽

Vol 4 (12) ◽

pp. 74-84

Author(s):

Brijesh Pare ◽

Satish Piplode ◽

Vaishali Joshi

Keyword(s):

Photocatalytic Activity ◽

Photocatalytic Degradation ◽

Room Temperature ◽

Light Irradiation ◽

Solar Light ◽

X Ray Diffraction ◽

Operational Parameter ◽

X Ray ◽

Solar Light Irradiation ◽

Scanning Electron

Flower like bismuth oxy chloride (BiOCl) was successfully synthesized by a simple hydrolytic method at room temperature. The precursor and as-prepared samples were characterized by X-ray diffraction (XRD), High Resolution Field Emission Scanning Electron Microscope (HR FESEM). The results indicated that the as-prepared BiOCl sample is self-assembled hierarchically with nano sheets. The photocatalytic activity of BiOCl was tested on the degradation of the Oxamyl (OM) under solar light irradiation. The results showed that pesticide molecules could be efficiently degraded over BiOCl under solar light irradiation. All the experiment were carried out in the following reaction condition, [OM] = 10-4 mol dm-3, BiOCl NPs= 40mg/50ml, pH= 6.3. Effect of operational parameter such as concentration of H2O2, K2S2O8, FeCl3, Fenton’s reagent (Fe3+/H2O2) and N2, O2 purging on the photocatalytic degradation was observed.

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SAFE MOORING OF LARGE CONTAINER SHIPS AT QUAY WALLS SUBJECT TO PASSING SHIP EFFECTS

The International Journal of Maritime Engineering ◽

10.5750/ijme.v159ia4.1037 ◽

2021 ◽

Vol 159 (A4) ◽

Author(s):

T Van Zwijnsvoorde ◽

M Vantorre

Keyword(s):

Design Parameter ◽

Operational Parameter ◽

The Individual ◽

Large Container

Container traffic and individual ships’ sizes increased dramatically over the last decades, testing the existing harbour infrastructure to its limits. An important aspect regarding the safety of the berthed vessel is the quality of the mooring configuration. A case study is presented, where an 18000 TEU container vessel is moored at a quay. The motions of the moored vessel and the forces in its lines due to ship passages are simulated, using the potential software ROPES and the UGent in-house package Vlugmoor. Focus is on the mooring plan (operational parameter) and the characteristics of the individual lines (design parameter).

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Operational parameter effects on inverter plasma performance

Surface and Coatings Technology ◽

10.1016/s0257-8972(00)01014-8 ◽

2001 ◽

Vol 136 (1-3) ◽

pp. 69-72 ◽

Cited By ~ 4

Author(s):

Seiji Takechi ◽

Satoshi Sugimoto ◽

Masato Kiuchi ◽

Katsutoshi Tanaka ◽

Seiichi Goto

Keyword(s):

Operational Parameter

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New Approaches in Modeling and Simulation of CO2 Absorption Reactor by Activated Potassium Carbonate Solution

Processes ◽

10.3390/pr7020078 ◽

2019 ◽

Vol 7 (2) ◽

pp. 78

Author(s):

Maria Harja ◽

Gabriela Ciobanu ◽

Tatjána Juzsakova ◽

Igor Cretescu

Keyword(s):

Mathematical Model ◽

Potassium Carbonate ◽

Energy Savings ◽

Co2 Concentration ◽

Packed Bed ◽

Packed Bed Reactor ◽

Co2 Absorption ◽

Operational Parameter ◽

Proposed Model ◽

Strong Relation

The increase of CO2 concentration in the atmosphere is in strong relation with the human-induced warming up due to industrial processes, transportation, etc. In order to reduce the CO2 content, end of pipe post-combustion methods can be used in addition to other methods and techniques. The CO2 capture by absorption in potassium carbonate–bicarbonate activated solutions remains a viable method. In this study, a mathematical model for a packed bed reactor has been developed and tested. The mathematical model is tested for an industrial reactor based on CO2 absorption in Carsol solutions. The proposed model was validated by resolving for CO2 and water content, carbonate–bicarbonate, concentrations etc. For each operational parameter the error was calculated. The error for CO2 concentration is up to 4%. The height of the packed reactor is calculated as function of CO2 concentration in the final gas phase. The validated model can also be used for absorbing other CO2 streams taking into account the fact that its efficiency was proved in industrial scale. Future reactors used for CO2 absorption should consist of two parts in order to use partially regenerated solutions in the first part, with significant energy savings in the operational costs.

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