Hakutulokset - "extraction efficiency"
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81
Progress in functional covalent organic frameworks as advanced materials for sample pretreatment
Julkaistu 2025-08-01“…Subsequently, the interaction mechanisms and analytical performances of methods based on functionalized COFs are critically analyzed, emphasizing their extraction efficiency and selectivity. Finally, the technical merits of functional COFs as high-performance adsorbents in sample pretreatment are highlighted, while addressing current challenges and outlining future research directions. …”Covalent organic frameworks (COFs) represent an emerging class of porous crystalline materials with immense potential as advanced materials for sample pretreatment. Their distinctive characteristics, including large specific surface areas, adjustable pore structures, robust chemical stability, and a...
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82
The Hydrodynamic Performance of a Vertical-Axis Hydro Turbine with an Airfoil Designed Based on the Outline of a Sailfish
Julkaistu 2025-06-01“…Parametric optimization revealed maximum energy extraction efficiency for the centrifugal rotor occurs at <i>λ</i> = 1.25 tip-speed ratio under <i>Re</i> = 1.3 × 10<sup>5</sup> flow conditions, while the axial-flow counterpart attained optimal performance at <i>λ</i> = 1.5 with <i>Re</i> = 5.5 × 10<sup>4</sup>. …”This study investigates an aerodynamic optimization framework inspired by marine biological morphology, utilizing the sailfish profile as a basis for airfoil configuration. Through Latin hypercube experimental design combined with optimization algorithms, four key geometric variables governing the a...
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83
Improving the Efficiency of Transverse Magnetic Polarized Emission from AlGaN Based LEDs by Using Nanowire Photonic Crystal
Julkaistu 2018-01-01“…By coupling in-plane emission to vertical emission, light-extraction efficiency (LEE) over 90% can, in principle, be expected from the device top surface for transverse magnetic polarized photons that was not previously possible in conventional planar quantum well devices. …”AlGaN-based deep ultraviolet (UV) light-emitting diodes (LEDs) are attractive for a wide range of applications. To date, however, the best reported external quantum efficiency (EQE) for LEDs operating in the wavelength range of ∼240 nm is well below 1%. In this paper, we have p...
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84
Ultrasound-Assisted Dispersive Solid-Phase Filter Extraction Coupled with Green Supercritical Fluid Chromatography Methodology for Simultaneous Determination of Hindered Phenolic A...
Julkaistu 2025-06-01“…Under optimized conditions, the method achieved high extraction efficiency, with the complete separation of all analytes within 10 min. …”The migration of hindered phenolic antioxidants from food contact materials (FCMs) into foodstuffs poses health risks due to endocrine disruption and organ toxicity. Hence, the development of a high-efficiency analytical method for hindered phenolic antioxidants is of great importance for food safet...
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85
Multifractal analyses on the retention mechanism of fracturing fluid in tight sandstone
Julkaistu 2025-07-01“…However, fracturing fluid often becomes retained within the reservoir, which can markedly reduce hydrocarbon extraction efficiency. The mechanisms behind this retention in tight sandstone remain unclear. …”Tight sandstone is defined by its low porosity, limited permeability, and considerable heterogeneity, necessitating hydraulic fracturing for hydrocarbon extraction. However, fracturing fluid often becomes retained within the reservoir, which can markedly reduce hydrocarbon extraction efficiency. The...
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86
Vanadium acid-reducing leaching from the fly ash of a thermal power plant
Julkaistu 2025-07-01“…Our findings show that vanadium (>80%) and nickel (>65%) are predominantly recovered from fly ash, while iron and manganese mostly remain in the solid residue. The highest extraction efficiency (99,6%) for vanadium was achieved when simultaneous treating ash with a solution of 1 М H2SO4 and 0,04 M Na2SO3 at 80°C for 30 minutes with ash ratio of 4 ml/1 g. …”Relevance. Due to the higher initial vanadium content in secondary sources compared to ore deposits, its extraction from the former appears to be a more cost-effective and resource-saving process. Fly ash from burning liquid fuels containing 1.9 wt % vanadium can be considered as a promising second...
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87
Compositional and nutritional value of lupin cultivars: Identifying high-protein seeds for enhanced protein isolate production and phytochemical valorisation
Julkaistu 2025-08-01“…The wet extraction process yielded high-purity protein isolates with favourable extraction efficiency. These findings highlight the potential of lupin for diverse applications in the food and industrial sectors. …”The rising global demand for sustainable protein sources has increased the interest in legumes, particularly lupin, due to its nutritional and technological advantages. Beyond the high protein content, some phytochemicals in lupin seeds such as quinolizidine alkaloids (QAs), saponins, phytic acid, a...
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88
Evaluation of performance and matrix compatibility of mixed mode C18-SCX SPME fibers for compounds with different physicochemical properties
Julkaistu 2025-08-01“…The fibers were tested for extraction efficiency, reproducibility, and matrix compatibility using a group of model compounds with different physicochemical properties, namely, codeine (logP=1.19), carbamazepine (logP=2.45), diazepam (logP=2.82), and propranolol (logP=3.47). …”Solid-phase microextraction (SPME) has evolved significantly since its inception, yet challenges remain in developing coatings fully compatible with LC-MS that combine broad polarity coverage with biocompatibility for complex matrices. This study evaluates mixed-mode C18-SCX (strong cation exchange)...
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89
Development and validation of an HPLC-DAD analytical method for quantitative and simultaneous determination of cefoperazone and prednisolone in intramammary ointment
Julkaistu 2025-07-01“…The test was also applied to the commercial sample for quality control purposes, with extraction efficiency being 69.66% for CPZ and 72.36% for PRED. …”Cefoperazone (CPZ) is a third-generation cephalosporin used to treat bovine mastitis. The association with steroidal anti-inflammatory drugs, such as prednisolone (PRED), provides an improvement in the animal's clinical response, which justifies its use. An analytical method capable of simultan...
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90
Enhanced Electroluminescence From Si Quantum Dots-Based Light-Emitting Devices With Si Nanowire Structures and Hydrogen Passivation
Julkaistu 2016-01-01“…Enhanced electroluminescence (EL) has been achieved from the light-emitting devices containing Si quantum dots/SiO<sub>2</sub> multilayers deposited on Si nanowire arrays because of the good antireflection characteristics of Si nanowire structures, which improves the light extraction efficiency. However, it is found that the EL is first enhanced with increasing the depth of the Si nanowires and then reduced to further increase the depth, though it exhibits the lowest reflectance (∼3%), which may be due to the increased surface defect states after long time etching, as revealed by electron spin resonance measurements. …”Enhanced electroluminescence (EL) has been achieved from the light-emitting devices containing Si quantum dots/SiO<sub>2</sub> multilayers deposited on Si nanowire arrays because of the good antireflection characteristics of Si nanowire structures, which improves the light ext...
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91
Determination of the Activity Coefficients of Components in a Di-2-ethylhexylphosphoric Acid–n-Hexane Binary System Using Gas Chromatography
Julkaistu 2025-06-01“…This work establishes a fundamental basis for investigating ternary systems, such as D2EHPA–aliphatic solvent–aromatic solvent and D2EHPA–metal complex–solvent systems, paving the way for enhanced liquid–liquid extraction efficiency.…”The thermodynamic properties of di-2-ethylhexylphosphoric acid (D2EHPA) in organic solvents are critical for optimizing metal extraction processes in hydrometallurgy, necessitating precise determination of activity coefficients in binary systems such as D2EHPA–n-hexane. This study was devoted to the...
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92
Effect of Oxidative Roasting on Selective Leaching of Lithium from Industrially Shredded Lithium Iron Phosphate Blackmass
Julkaistu 2025-06-01“…However, contrary to expectations, mild-acid leaching (pH 2, 40 g/L, 20 °C) of roasted blackmass did not improve lithium recovery compared to unroasted material, yielding approximately 33% extraction efficiency. Strong-acid leaching (pH 0, H<sub>2</sub>SO<sub>4</sub>/H<sub>2</sub>O<sub>2</sub>) achieved over 95% lithium recovery but also resulted in significant co-dissolution of iron and other impurities. …”The increasing need-based demand for lithium iron phosphate (LFP) batteries in electric vehicles and energy storage systems necessitates the development of efficient and sustainable recycling methods. This study investigates the effect of oxidative roasting on lithium extraction from industrially so...
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93
Evaluation of oil yield and quality of BINA mustard’s cultivars under two extraction conditions
Julkaistu 2025-12-01“…Oil yield shows a negative correlation (-0.562) with moisture content, as higher moisture potentially reduces oil extraction efficiency. Oil yield has a positive correlation (0.597) with crude lipid content, as higher lipid content usually leads to higher oil yield. …”This research demands to evaluate the oil yield and quality of five enhanced mustard (Brassica spp.) cultivars developed by the Bangladesh Institute of Nuclear Agriculture (BINA). The enhanced varieties are evaluated against traditional local kinds using two distinct extraction methods, cold pressin...
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94
Natural Deep Eutectic Solvents as Alternative Flavonoid Extractants from the Sedative Plant Composition
Julkaistu 2022-09-01“…They are biodegradable, safe, stable, their production is affordable and easily feasible, and the extraction efficiency is comparable to known organic solvents. …”Introduction. Natural deep eutectic solvents (DESs) are promising extractants for many biologically active substances from plant raw materials. They are biodegradable, safe, stable, their production is affordable and easily feasible, and the extraction efficiency is comparable to known organic solve...
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95
Determination method for trace polycyclic aromatic hydrocarbons in paddy soils
Julkaistu 2017-11-01“…In order to improve determination accuracy and recovery rate, the pretreatment conditions for the determination of 16 PAHs in paddy soils are of great significance.On the basis of former work, in order to get the highest extraction efficiency and recovery rate, we compared two different extract solvent mixtures, four different clean-up columns and three different elution solutions, and also compared the elution volume and temperature of nitrogen blowing to optimize the determination method for trace PAHs in paddy soils under the laboratory condition. …”Polycyclic aromatic hydrocarbons (PAHs), a kind of persistent organic pollutants in soil, are of great concern due to their carcinogenic, mutagenic and teratogenic characteristics. PAHs are mainly derived from incomplete combustion processes and pyrolysis of organic materials. The occurrence, source...
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96
Deciphering the mechanism of nano-enhanced docosahexaenoic acid accumulation in microalgae
Julkaistu 2025-10-01“…Nanoparticles also play a critical role in increasing extraction efficiency and stability of DHA in microalgae, making them a promising tool for bioprospecting. …”Docosahexaenoic acid (DHA) is a vital bioresource for human health due to its cardiovascular function, anti-inflammatory significance, and cognitive benefits. But the sustainability of DHA from its traditional sources is in question due to overfishing and environmental concerns. Microalgae is a sust...
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97
EKNet: Graph Structure Feature Extraction and Registration for Collaborative 3D Reconstruction in Architectural Scenes
Julkaistu 2025-06-01“…The vertices and edges of geometric structure models are sparse, and existing methods face challenges such as low feature extraction efficiency and substantial data requirements when processing sparse graph structures after geometrization. …”Collaborative geometric reconstruction of building structures can significantly reduce communication consumption for data sharing, protect privacy, and provide support for large-scale robot application management. In recent years, geometric reconstruction of building structures has been partially st...
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98
A Review on Improving the Oxidative Stability of Pine Nut Oil in Extraction, Storage, and Encapsulation
Julkaistu 2025-06-01“…Green extraction technologies such as microwave-assisted extraction (MAE) and ultrasonic-assisted extraction (UAE) have been introduced to enhance extraction efficiency and promote environmental sustainability. …”Pine nut oil (PNO) is highly valued by consumers for its rich content of unsaturated fatty acids, which confer unique nutritional benefits. However, PNO is highly susceptible to lipid oxidation during storage and extraction. This chemical degradation compromises product quality and poses potential r...
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99
Asphaltene transformation and agglomeration in compressed light oil systems under carbon dioxide injection in a porous structure: A molecular dynamics study
Julkaistu 2025-10-01“…Asphaltene deposition poses a significant challenge in the application of improved oil recovery by CO2 injection, adversely affecting reservoir permeability and extraction efficiency. Despite previous research highlighting the importance of this problem, there was a critical deficiency of knowledge on the impacts of pressure changes on asphaltene agglomeration and structural transformation at the atomic level in compressed light oil reservoirs. …”The rising depletion of light fossil fuels is leading to an increasing global dependence on heavy oil production. Asphaltene deposition poses a significant challenge in the application of improved oil recovery by CO2 injection, adversely affecting reservoir permeability and extraction efficiency. De...
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100
Enhancing the recovery yield and quality of oil from coconut residue by ultrasound pretreatment-assisted ethanol extraction
Julkaistu 2025-08-01“…Ultrasound power (120, 180, and 240 W), pretreatment time (0, 15, 30, and 45 min), material particle size (original, >0.60 mm, 0.60–0.36 mm, 0.36–0.25 mm, and <0.25 mm), and solvent-to-material ratio (10, 15, and 20 mL/g) were determined for maximum extraction efficiency and high oil quality. Results suggested that optimal ultrasound power and pretreatment time were 180 W and 45 min. …”Coconut residue, a by-product of the coconut milk industry, contains a high percentage of oil. This study extracted oil from coconut residue using an ultrasound pretreatment process with absolute ethanol as a green solvent. Ultrasound power (120, 180, and 240 W), pretreatment time (0, 15, 30, and 45...
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