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Showing 1 to 20 of 87 for “"PRETREATMENTS"”.
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Evaluation of plasma sprayed coatings as surface pretreatments for adhesive bonding
The use of plasma-sprayed coatings as surface pretreatments for adhesive bonding has been investigated. Increased pressure by the Environmental Protection Agency and other environmental groups has prompted the search for environmentally safe methods of pretreating metals before bonding. Plasma …
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Characterization of Cellulase Enzyme Inhibitors Formed During the Chemical Pretreatments of Rice Straw
… physico-chemical, mechanical and biological pretreatments, is often practiced such that biomass becomes available to downstream processing. Pretreatments, such as dilute acid and hot water, are effective means of biomass conversion. However, despite their processing importance, …
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The Effect of Destoning and Enzymatic Pretreatments on the Biofuel Production from Olive Cake
… to be converted into a biofuel. Sustainable pretreatments such as destoning and enzymatic pretreatment increase biomethane yield. The digestate created from the anaerobic digestion of olive cake can be used as a soil amendment, adding further value to olive cake.</p>
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An Investigation of Plasma Pretreatments and Plasma Polymerized Thin Films for Titanium/Polyimide Adhesion
Plasma pretreatments are environmentally benign and energy efficient processes for modifying the surface chemistry of materials. In an effort to improve the strength of the titanium alloy/FM-5 polyimide adhesive joint for aerospace applications, oxygen plasma pretreatments and novel thin plasma …
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Application of physicochemical and biological pretreatments to enhance volatile fatty acids production via Dark Fermentation from agri-food waste
… it necessitates the application of costly pretreatments to ensure adequate solubilization of the organic matter present in the biomass. Residual biomass is a cheap carbon source with high volume availability and decentralized geographical distribution, but its use requires the optimization …
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ΜΕΛΕΤΗ ΤΟΥ ΜΗΧΑΝΙΣΜΟΥ ΠΡΟΚΑΤΕΡΓΑΣΙΑΣ ΓΙΑ ΤΗΝ ΜΕΤΑΤΡΟΠΗ ΤΗΣ ΒΙΟΜΑΖΑΣ ΣΕ ΚΑΥΣΙΜΑ ΚΑΙ ΧΗΜΙΚΑ: ΕΠΙΔΡΑΣΗ ΣΤΗ ΣΤΕΡΕΑ ΦΑΣΗ
THE EFFECTS OF PHYSICAL AND CHEMICAL PRETREATMENTS ON THE PARTICLE SIZE, SPECIFIC SURFACE AREA, CRYSTALLINITY INDEX, CHEMICAL COMPOSITION, DENSITY OF WHEAT STRAW IS EXAMINED. THE PHYSICAL PRETREATMENTS STUDIED WERE HAMMER - AND BALL-MILLING. THE CHEMICAL PRETREATMENTS UTILIZED WERE DELIGNIFICATIONS …
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Study of Adsorbate Interactions of Alumina Surfaces Using Nuclear Magnetic Resonance Methods
… is the role of water in thermal, hydrothermal pretreatments and operating conditions for dimethyl methyl ether (DME) synthesis and is the hydroxyl coverage related to the catalytic activity? Advanced NMR techniques were performed, including NMR relaxometry and diffusiometry at 43 MHz to …
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Improving product release from saccharomyces cerevisiae and kluyveromyces lactis by pretreatment for cell wall weakening and selective product release
… through the high pressure homogenisation (HPH). Pretreatments were selected for their ability to weaken the yeast cell wall, rather than to permeabilise the cell. This allowed product release to be concentrated into the disruption step only, not distributed between the disruption and …
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Anaerobic co-digestion of municipal solid waste and sewage sludge.
… To facilitate organics solubilization, three pretreatments were evaluated: thermal, alkaline and thermochemical. Using a central composite experimental design, two factors were studied, the total solids content of the feed and its particle size. For all three pretreatments, second order …
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The role of surface pretreatment and surface analysis in the bondability of carbon fiber-polyimide matrix composites
… matrix composite surfaces was evaluated. Eight pretreatments were studied: methanol wash, gritblast, sulfuric acid soak, ammonia plasma, argon plasma, argon plasma followed by ammonia plasma, nitrogen plasma, and oxygen plasma. The pretreated surfaces were chemically characterized through the …
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Avaliação da torrefação e densificação de resíduos agrícolas no Brasil
… its mass per unit of volume. Hence, these pretreatments simplify the bioenergy supply chain logistics. Therefore, this dissertation aims to develop a methodology to assess the benefits of torrefaction and pelletization to the syngas production from straw supply chain in Brazil. Firstly, it …
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Miscanthus conversion to ethanol: Effect of particle size and pretreatment conditions for hot water
… water, dilute acid or dilute ammonium hydroxide pretreatments. Sugar yields from enzyme hydrolysis was used to measure pretreatment e ciency. Geometric mean diameters decreased with screen size: 0.08 mm sieve screen (56 um) followed by 2.0 mm (301 um) and 6.0 mm (695 um) screens. Enzymatic sugar …
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Through adhesive surface treatment for bonded joints
… adhesive surface treatments have been defined as pretreatments for adhesive bonding where the adherend surface is physically attacked under a covering layer of uncured adhesive. In addition to the usual benefits associated with physical pretreatments, there is potential for novel chemical …
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Lignocellulose deconstruction using glyceline and a chelator-mediated Fenton system
… limited enzyme accessibility. Hence, biomass pretreatments that destroy native cell wall structure and allows enzyme access are required for effective biomass conversion techniques. This research studied two novel pretreatment methods on two wood species: 1) a deep eutectic solvent (DES) that, …
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ΠΕΙΡΑΜΑΤΙΚΗ ΚΑΙ ΤΕΧΝΟΟΙΚΟΝΟΜΙΚΗ ΑΞΙΟΛΟΓΗΣΗ ΣΥΣΤΗΜΑΤΩΝ ΠΟΥ ΑΞΙΟΠΟΙΟΥΝ ΕΝΕΡΓΕΙΑΚΑΚΥΤΤΑΡΙΝΟΥΧΑ ΥΛΙΚΑ ΠΡΟΣ ΑΙΘΑΝΟΛΗ. ΣΥΝΘΕΣΗ ΚΑΙ ΑΡΙΣΤΟΠΟΙ...
… NEXT STAGE, AND REQUIRING SPECIFIC AND HIGH COST PRETREATMENTS DURING THE PREVIOUS STEPS. FOR ASUCCESSFUL SOLUTION OF AN HYDROLYSIS, SYSTEM THE NUMBER OF POSSIBLE COMBINATION (CATALYST, REACTOR TYPE, EQUIPMENT, TEMPERATURE, PRESSURE, CONCENTRATION, FEMENTABILITY OF SUBSTRATE) IS HUGE. IN THIS …
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ΜΕΛΕΤΗ ΠΡΟΚΑΤΕΡΓΑΣΙΩΝ ΓΙΑ ΤΗ ΒΕΛΤΙΩΣΗ ΤΗΣ ΟΞΙΝΗΣ ΥΔΡΟΛΥΣΗΣ ΚΥΤΤΑΡΙΝΟΥΧΩΝ ΥΛΙΚΩΝ
… IT FOR THE EVALUATION OF PHYSICAL AND CHEMICAL PRETREATMENTS FOR THE IMPROVEMENT OF AND HYDROLYSIS OF CELLULOSIC MATERIALS. A FOUR-STEP PSEUDO-FIRST ORDER KINETIC MODEL WAS DEVELOPED, AND WAS USED TO DESCRIBE THE ACID HYDROLYSIS OF RESISTING IN HYDROLYSIS AND EASILY HYDROLYSABLE POLYSACCHARIDES. …
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The Effect of Pretreatment Methods on Methane Yield and Nutrient Solubilization During Anaerobic Digestion of Microalgae
… energy balance indicated that none of the pretreatments led to a net increase in energy conversion to biomethane. However, pretreatment did increase the initial N and P solubilization rates, but, after digestion, the ultimate N and P solubilization was nearly the same among the treatments …
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Effects of Surface Microstructure on the Strength of Adhesively Bonded Structures
… provides guidance to tailor optimal surface pretreatments of aluminum substrate to improve interfacial adhesion performance."
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On the Recalcitrant Nature of Sphagnum's Cell Wall
… to enzymatic hydrolysis under standard alkali pretreatments that readily enable their breakdown in vascular plant controls. Screening multiple pretreatments revealed that Sphagnum walls are compositionally familiar but architecturally fortified, with a unique phenolic caging complex that blocks …
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