Papers by Keyword: Capacity

Abstract: This study analyzed apron congestion and operational inefficiencies at Nnamdi Azikiwe International Airport (NAIA), Abuja, using regression and time-series analyses of aircraft and passenger movement data. The research aimed to identify factors influencing apron capacity, assess their impact on operations, and propose improvement strategies. Results showed that peak traffic volume strongly contributes to delays (β = 0.608), indicating that increasing aircraft movements strain the limited apron capacity. Domestic narrow-body aircraft significantly reduced delays (p = 0.001) due to quicker turnaround times, while other variables like domestic and international aircraft movements had indirect but notable effects. Time-series analysis (2013–2024) revealed seasonal peaks in January, July, and August, coinciding with heavy travel demand. Projections for 2025–2030 (CAGR = 3.24%) predict worsening congestion without infrastructure upgrades. Operational inefficiencies such as refueling and baggage handling delays further exacerbate congestion. Survey responses indicated that 68.3% of participants reported inadequate apron capacity, and 45% experienced daily congestion. The study concludes that improving efficiency and capacity requires apron expansion, better ground handling coordination, staggered flight scheduling, and enhanced stakeholder collaboration to reduce delays, support future traffic growth, and improve passenger satisfaction.

Abstract: In the past few years Prussian Blue Analogues (PBAs), as advanced metal organic framework compounds, have gathered a lot of attention due to its three-dimensional structural network and properties. PBAs are famous for their multitasking ability as they have shown an efficient role in scientific research and development with their excellent performance in various fields like, electrochemical sensors, photocatalysis, electrocatalysis, and energy storage applications. Apart from their high-tech productivity, PBAs also have some other advantages associated to them such as benign nature, economical and facile synthesis, extensive surface properties, higher theoretical capacity and exceptional electrochemical behavior which makes it more promising material for energy storage application. To further tune its properties according to the application of interest, the chemical modification by metal incorporation is the most commonly adopted strategy. For this purpose, the major research is done in the synthesis of bimetallic PBAs. The presence of metal atoms with different oxidation states can bring about dramatic reinforcements like finer microstructures with better crystallographic features, ultimately giving rise to more stable electrochemical behavior. In this article, we aim to list out all the bimetallic PBAs with focus on the synergistic effect of more than one metal within the structure of PBA and thorough analysis of their Electrochemical properties in energy storage applications.

Abstract: The silicon-aluminum oxide-nitride-silicon oxide-silicon (hereafter SANOS) could be candidates for ultra violet total dose (hereafter UV TD) nonvolatile sensors. In the case of SANOS UV TD radiation sensors, the UV radiation induces a significant increase of threshold voltage V_T. The changes of V_T for SANOS after UV radiation have a correlation to the UV TD as well. In this paper, the performance for capacitor types of SANOS UV TD nonvolatile sensor were discussed in detailed. The SANOS capacitor device in this study has demonstrated the better feasibility for UV TD nonvolatile sensor application.

Abstract: Numerous attempts have been made to improve the existing intersection systems to maximize capacity and reduce the delay costs and queues. This paper introduces a simulation method to study the effectiveness of a new technique introduced recently in China – the left-turn waiting area. This has an extended left lane that allows the vehicles to wait before the signal turns green. It is reported that this system can significantly improve intersection performance. This paper introduces the different types of left-turn waiting areas which have been widely implemented in China. The method of using micro-simulation VISSIM to study the effectiveness of left-turn waiting area is proposed in this paper, along with some preliminary results of a case study.

Abstract: The article describes application of using liquid crystals in area of contactless scanning. Concrete application is showed in a turning process oriented to controlling and direction. Polarising attributes of liquid crystals is used in integration of exactness and sesitivity of electrostatical scanning principe and stability and simplicity of optical scanning, whole system has a higher resistance to an exterior disturbing actions and resistance to a possible electrostatical discharge. The article describes a consecution and conditions of practical measuring of principe ́s attestation, elaboration and interpretation of measuring answer.

Abstract: In this paper, the properties of fly ash were investigated. The particle size distribution, the fourier transform infrared spectroscopy (FTIR), the morphology, the surface area, pore volume, average pore diameter and the modification methods of fly ash were examined. The study indicated that the particle size of fly ash was about 0.2 µm, the particle shape was irregular. FTIR spectrums of fly ash modified were basically the same and the functional groups of fly ash were rarely. SEM of fly ash showed that the particles were similar to lamellar structure and the particle shape was irregular. The BET specific surface area of fly ash modified by H₂O₂ was 41.63 m² /g. The fly ash of modified by H₂O₂ had better adsorption performance than other modified methods. The modification can effectively improve the adsorption performance of fly ash. The result indicated that the fly ash as adsorbent for wastewater treatment was feasible.

Abstract: Nowadays, the problems of climate change and global warming become more serious on environmental concern due to the higher amount of carbon dioxide in the atmosphere. Basically the main sources of carbon dioxide come from anthropogenic activities such as power generation, industries and so on. Currently, the effective technology to remove CO₂ from these sources is absorption especially chemical absorption. Also, the chemicals used are one of the key parameters for effective CO₂ removal. The widely used amine solutions are monoethanolamine (MEA) and diethanolamine (DEA). Nevertheless, they also have disadvantages such as low capacity, corrosion and high heat of regeneration thus making carbon capture technology more expensive. Therefore, many novel materials have been developed to improve the efficiency and compensate the disadvantages of some amines. Consequently, the objective of this work is to investigate the vapor-liquid equilibrium of CO₂ in novel materials of 2-(methylamino) ethanol or 2-MAE and 3-Amino-1-Propanol or 3-AP at the temperature from 40 °C to 80 °C and CO₂ partial pressures ranging from 5 to 100 kPa. The solubility results of CO₂ in novel materials are compared with those of aqueous solution of MEA and DEA. For cyclic capacity, the results present that novel materials provide higher performance than that of MEA with less cost. This means that novel materials can save more energy and cost for solution regeneration and making it more economically viable.

Abstract: he negative differential capacity has been observed in case of MIS structures with SiO_x and Si_xO_yN_z films containing Si nanoclusters. It has been shown that existence of negative differential capacity depends on charge state of Si nanoclusters or electron traps　in the insulating matrix. In case of Si_xO_yN_z films the two peaks have been revealed in C-V characteristics connected with Si nanoclusters and electron traps. The low-temperature annealing of Si_xO_yN_z films in hydrogen passivates the electron traps caused by Si dangling bonds and as a result the peak in C-V characteristics connected with electron traps disappears. The following low-temperature annealing in vacuum caused the some effusion of hydrogen from the film and appearance of electron traps and connected with them capacity shoulder on C-V characteristics. It has been shown, that the frequency and temperature dependences of the negative differential capacitance in C-V curves can be successfully used for the determination of nanoclusters and traps parameters for the samples with the nanoclusters embedded in SiO₂ or Si_xO_yN_z films.

Abstract: This paper summarizes the main elements of provisional calculations and charts which are sufficient to justify proposals for construction of a wind power station with the pre-designed capacity of 50 MW. Methodology of wind power potential assessment at the point of construction is given, a layout of the construction site and the structure of a wind farm are developed. The offered below materials make it possible to perform the first stages of the design.

Abstract: When planning a new manufacturing system, the optimal investment in the system capacity is a major decision to make. The problem of capacity planning is not an easy because of the unpredictable character of the market demand and multi-criteria optimization character of the task. Therefore there is still no one complex methodology of the capacity planning and management. In this paper some mathematical models for capacity planning which can be used at the stage of manufacturing system design or expansion are presented.