The document discusses optimal conditions for the depolymerization of butyl lactate oligomers in different reactor types. It examines the effects of temperature and residual pressure on lactide yield, meso-lactide byproduct yield, and reactor productivity. Depolymerization experiments were conducted in a batch reactor, periodic rotary film evaporator, and continuous rotary film evaporator. The results showed that the continuous rotary film evaporator at 220°C and 20 mm Hg residual pressure provided the highest lactide yield and reactor productivity, making it the optimal reactor and conditions for the depolymerization stage.
Corrosion studies of colmonoy - 6 in nitric acid during gadolinium removal st...RAMASUBBU VELAYUTHAM
This document summarizes a study on the corrosion of Colmonoy-6, a nickel-based alloy used in valves and bearings of nuclear power plant moderator systems, when exposed to nitric acid conditions present during gadolinium removal from the moderator. Specimens of undiluted Colmonoy-6 deposits and Colmonoy-6 coatings on stainless steel with varying levels of dilution were exposed to a nitric acid solution at 65°C, and corrosion rates were estimated through weight loss and electrochemical measurements. Microstructural analysis found the undiluted deposit and multiple layer coatings contained more carbide and boride precipitates than single layer coatings, indicating lower dilution effects.
Toxicity immobilization of refinery sludge containing heavy metals via vitrif...eSAT Journals
Abstract Heavy metals are known to be toxic to human and the environment. Despite the growing of petrochemical and refinery industries, the world is facing problems with the heavy metals contamination from the sludge by the industries. Many methods have been applied to address these issues from the refinery sludge. In this study, stabilization and solidification of refinery sludge containing heavy metals using vitrification method was utilized to solve this problem. The ashing temperature of 550oC was selected in preparing the ash of the dried sludge prior to the vitrification process at 1110oC to 1400oC. After vitrification, all samples were morphologically, thermally and toxically analyzed using Scanning Electron Microscopy, Thermogravimetric Analysis and Toxicity Characteristic Leaching Procedure. The sludge contained high amount of iron and aluminum, followed by some amount of magnesium, gold, arsenic and zinc with some traces of nickel and lead. Results showed that at maximum vitrified temperature of 1400oC, no magnesium, nickel and lead were detected in the sludge and only some traces of other heavy metals with less than 1 ppm. The vitrification method exhibits excellent output in immobilizing the transition metals leading to a reduction in environmental pollution caused by petrochemical and refinery sludge containing heavy metals. Index Terms: Vitrification, Heavy metals contamination, Refinery sludge, Toxicity, Leaching analysis
IJRET : International Journal of Research in Engineering and Technology is an international peer reviewed, online journal published by eSAT Publishing House for the enhancement of research in various disciplines of Engineering and Technology. The aim and scope of the journal is to provide an academic medium and an important reference for the advancement and dissemination of research results that support high-level learning, teaching and research in the fields of Engineering and Technology. We bring together Scientists, Academician, Field Engineers, Scholars and Students of related fields of Engineering and Technology.
This document summarizes research on the catalytic wet peroxide oxidation of olive oil mill wastewater over zeolite-based catalysts. The researchers prepared a Cu/13X catalyst by ion exchange and tested its activity and stability for reducing phenolic compounds in wastewater. Characterization showed the ion exchange did not affect zeolite structure but a post-treatment calcination at 1273K decreased surface area and increased copper oxide particles. Testing showed the catalyst reduced total phenols in wastewater by over 80% and TOC by 20% with low copper leaching. The research aims to develop an effective treatment to reduce toxicity of olive oil wastewater before conventional biological processing.
V mn-mcm-41 catalyst for the vapor phase oxidation of o-xylenesunitha81
This document describes a study investigating V and Mn incorporated mesoporous molecular sieves for the vapor phase oxidation of o-xylene. Mesoporous monometallic V-MCM-41, Mn-MCM-41, and bimetallic V-Mn-MCM-41 molecular sieves were synthesized and characterized. Their activity was measured for the gas phase oxidation of o-xylene to phthalic anhydride. Among the catalysts, V-MCM-41 with Si/V = 50 exhibited the highest activity and selectivity towards producing phthalic anhydride under the experimental conditions. The physico-chemical properties of the catalysts, including metal content, surface area,
This document describes a study that synthesized γ-alumina nanotubes using a hydrothermal method and used them to support iron, cobalt, and nickel Fischer-Tropsch catalysts. Characterization showed the alumina nanotubes had a surface area of 203.73 m2/g. The three catalysts were prepared by wet impregnation and showed different catalytic behaviors. Nickel catalyst had the highest activity, followed by cobalt then iron catalyst, based on measurements of acidity, reducibility, active sites, and CO conversion in Fischer-Tropsch testing.
Mechanical Properties and Flexural Performance of Geopolymer ConcreteIRJET Journal
This document presents the results of an experimental study on the mechanical properties and flexural performance of geopolymer concrete. Fly ash was used as the sole binder to replace cement. Different mix proportions of geopolymer concrete with compressive strengths ranging from 20 MPa to 35 MPa were tested. The specimens were heat cured at 60°C for 24 hours. Testing showed that the compressive strength and flexural strength of the geopolymer concrete samples increased as the fly ash content increased. An empirical formula is derived from the test results to predict the strengths of fly ash-based geopolymer concrete.
The hydroisomerization of light naphtha fractions is an important industrial process used to produce high octane gasoline blendstocks by transforming low octane normal and less branched paraffin components into more branched isomers with higher octane ratings. Due to environmental restrictions on gasoline components, refineries have implemented hydroisomerization to reduce benzene levels and increase octane while meeting regulations. The thesis will investigate hydroisomerization of Iraqi light naphtha over different catalysts to optimize conditions for producing isomerized products.
Corrosion studies of colmonoy - 6 in nitric acid during gadolinium removal st...RAMASUBBU VELAYUTHAM
This document summarizes a study on the corrosion of Colmonoy-6, a nickel-based alloy used in valves and bearings of nuclear power plant moderator systems, when exposed to nitric acid conditions present during gadolinium removal from the moderator. Specimens of undiluted Colmonoy-6 deposits and Colmonoy-6 coatings on stainless steel with varying levels of dilution were exposed to a nitric acid solution at 65°C, and corrosion rates were estimated through weight loss and electrochemical measurements. Microstructural analysis found the undiluted deposit and multiple layer coatings contained more carbide and boride precipitates than single layer coatings, indicating lower dilution effects.
Toxicity immobilization of refinery sludge containing heavy metals via vitrif...eSAT Journals
Abstract Heavy metals are known to be toxic to human and the environment. Despite the growing of petrochemical and refinery industries, the world is facing problems with the heavy metals contamination from the sludge by the industries. Many methods have been applied to address these issues from the refinery sludge. In this study, stabilization and solidification of refinery sludge containing heavy metals using vitrification method was utilized to solve this problem. The ashing temperature of 550oC was selected in preparing the ash of the dried sludge prior to the vitrification process at 1110oC to 1400oC. After vitrification, all samples were morphologically, thermally and toxically analyzed using Scanning Electron Microscopy, Thermogravimetric Analysis and Toxicity Characteristic Leaching Procedure. The sludge contained high amount of iron and aluminum, followed by some amount of magnesium, gold, arsenic and zinc with some traces of nickel and lead. Results showed that at maximum vitrified temperature of 1400oC, no magnesium, nickel and lead were detected in the sludge and only some traces of other heavy metals with less than 1 ppm. The vitrification method exhibits excellent output in immobilizing the transition metals leading to a reduction in environmental pollution caused by petrochemical and refinery sludge containing heavy metals. Index Terms: Vitrification, Heavy metals contamination, Refinery sludge, Toxicity, Leaching analysis
IJRET : International Journal of Research in Engineering and Technology is an international peer reviewed, online journal published by eSAT Publishing House for the enhancement of research in various disciplines of Engineering and Technology. The aim and scope of the journal is to provide an academic medium and an important reference for the advancement and dissemination of research results that support high-level learning, teaching and research in the fields of Engineering and Technology. We bring together Scientists, Academician, Field Engineers, Scholars and Students of related fields of Engineering and Technology.
This document summarizes research on the catalytic wet peroxide oxidation of olive oil mill wastewater over zeolite-based catalysts. The researchers prepared a Cu/13X catalyst by ion exchange and tested its activity and stability for reducing phenolic compounds in wastewater. Characterization showed the ion exchange did not affect zeolite structure but a post-treatment calcination at 1273K decreased surface area and increased copper oxide particles. Testing showed the catalyst reduced total phenols in wastewater by over 80% and TOC by 20% with low copper leaching. The research aims to develop an effective treatment to reduce toxicity of olive oil wastewater before conventional biological processing.
V mn-mcm-41 catalyst for the vapor phase oxidation of o-xylenesunitha81
This document describes a study investigating V and Mn incorporated mesoporous molecular sieves for the vapor phase oxidation of o-xylene. Mesoporous monometallic V-MCM-41, Mn-MCM-41, and bimetallic V-Mn-MCM-41 molecular sieves were synthesized and characterized. Their activity was measured for the gas phase oxidation of o-xylene to phthalic anhydride. Among the catalysts, V-MCM-41 with Si/V = 50 exhibited the highest activity and selectivity towards producing phthalic anhydride under the experimental conditions. The physico-chemical properties of the catalysts, including metal content, surface area,
This document describes a study that synthesized γ-alumina nanotubes using a hydrothermal method and used them to support iron, cobalt, and nickel Fischer-Tropsch catalysts. Characterization showed the alumina nanotubes had a surface area of 203.73 m2/g. The three catalysts were prepared by wet impregnation and showed different catalytic behaviors. Nickel catalyst had the highest activity, followed by cobalt then iron catalyst, based on measurements of acidity, reducibility, active sites, and CO conversion in Fischer-Tropsch testing.
Mechanical Properties and Flexural Performance of Geopolymer ConcreteIRJET Journal
This document presents the results of an experimental study on the mechanical properties and flexural performance of geopolymer concrete. Fly ash was used as the sole binder to replace cement. Different mix proportions of geopolymer concrete with compressive strengths ranging from 20 MPa to 35 MPa were tested. The specimens were heat cured at 60°C for 24 hours. Testing showed that the compressive strength and flexural strength of the geopolymer concrete samples increased as the fly ash content increased. An empirical formula is derived from the test results to predict the strengths of fly ash-based geopolymer concrete.
The hydroisomerization of light naphtha fractions is an important industrial process used to produce high octane gasoline blendstocks by transforming low octane normal and less branched paraffin components into more branched isomers with higher octane ratings. Due to environmental restrictions on gasoline components, refineries have implemented hydroisomerization to reduce benzene levels and increase octane while meeting regulations. The thesis will investigate hydroisomerization of Iraqi light naphtha over different catalysts to optimize conditions for producing isomerized products.
Abstract— Thermally Simulated Depolarization Current measurement is an excellent but not widely used method for identifying relaxation processes in polymers. The TSDC method is used here to analyze the molecular movements in biopolymers. Differential Scanning Calorimetry is a technique used to measure thermal properties of polymers based on the rate at which they absorb heat energy compared to a reference material. The two techniques take advantage of the energy changes involved in the various phase transitions of certain polymer molecules. This allows for several properties of the material to be ascertained; melting points, enthalpies of melting, crystallization temperatures, glass transition temperatures and degradation temperatures. The examined biopolymer films are made from biological materials such as proteins and polysaccharides. These materials have gained wide usage in pharmaceutical, medical and food areas. The uses of biopolymer films depend on their structure and mechanical properties. This work is based on three types of alginate, and gelatin films. The films were prepared by casting. The casting technique used aqueous solutions in each case of sample preparation. The manufacturing process of the sodium alginate and gelatin films was a single stage solving process, and for the calcium alginate and alginic acid have a chemical reaction process.
The document discusses MOCVD (Metalorganic Chemical Vapor Deposition) technology and material growth. It covers the MOCVD growth system, common metalorganic compounds used as sources, gas phase and surface reactions during growth, characterization techniques for analyzing materials, and some issues related to growing GaN and related materials by MOCVD.
This document summarizes a study on the effect of various synthesis parameters on the setting time and workability of fly ash-based geopolymer paste and mortar. Specifically, it examines the effect of alkali content (Na2O/Al2O3 ratio), silica content (SiO2/Al2O3 ratio), and water-to-binder ratio. The study found that initial and final setting time decreased with increasing alkali content and water-to-binder ratio, but increased with increasing silica content. Workability, as measured by flow table tests, also decreased with higher alkali content and water-to-binder ratio. The results provide an understanding of how synthesis parameters influence
Dealumination and Na activation of natural zeolite for CO2 adsorption on biogasIJERD Editor
In this study, natural zeolites from the Philippines were modified using NaOH heat treatment and NaCl hydrothermal process. Pre-treatment using ferro-filtering and dealumination using different concentrations of HCl acid leaching were prepared prior to sodium activation. Heat treatment was performed using 5M NaOH at 80 °C for 72 hrs while 3 cycle hydrothermal process was performed using 5M NaCl at 10 psi for 1 hr. Diffraction pattern from XRD showed Heulandite (HEU) – Clinoptilolite (CLI) and Mordenite (MOR) framework for raw and acid pre-treated zeolites.
Synthesis and Characterization of Atmospheric Residue Hydrodemetalization (Ar...IOSR Journals
This document describes the synthesis and characterization of an atmospheric residue hydrodemetalization (ARDHM) catalyst for crude oil processing using Indonesian natural zeolite. The zeolite was treated with HCl to increase acidity and then loaded with nickel and molybdenum metals via impregnation. Characterization showed the metals did not block pores or degrade crystallinity and increased acidity. Testing on model compounds like nickel porphyrin, thiophene and pyridine showed the catalyst effectively removed metals and sulfur at temperatures of 360-390°C. The spent catalyst was deactivated by coke deposition but could be regenerated through burning off the coke.
Studies on Nitration of Phenol over Solid Acid Catalyst by Lipika Das, Koushi...crimsonpublisherspps
- Phenol was selectively nitrated to ortho-nitrophenol using dilute nitric acid over gamma-alumina catalyst in liquid phase at room temperature.
- Gamma-alumina was prepared using a controlled precipitation method and characterized using various techniques which showed it had suitable properties for nitration.
- Parameters like concentration of reactants, weight of catalyst, solvent, temperature and time were varied to determine their effect on the reaction. Kinetics of the reaction were also studied.
nano catalysis as a prospectus of green chemistry Ankit Grover
Nanocatalysis and green chemistry prospects.
Nanocatalysts have higher activity, selectivity, and efficiency than traditional catalysts due to their high surface area to volume ratio. They can be designed for sustainability by having properties like recyclability, durability, and cost-effectiveness. Examples discussed include gold nanoparticle catalysts for oxidation reactions and magnetically separable nanoparticle catalysts. Nanocatalyst applications highlighted are water splitting for hydrogen production and storage, and fuel cells.
International Journal of Engineering Research and Applications (IJERA) is an open access online peer reviewed international journal that publishes research and review articles in the fields of Computer Science, Neural Networks, Electrical Engineering, Software Engineering, Information Technology, Mechanical Engineering, Chemical Engineering, Plastic Engineering, Food Technology, Textile Engineering, Nano Technology & science, Power Electronics, Electronics & Communication Engineering, Computational mathematics, Image processing, Civil Engineering, Structural Engineering, Environmental Engineering, VLSI Testing & Low Power VLSI Design etc.
Studies on Nitration of Phenol over Solid Acid Catalyst | Crimson PublishersDanesBlake
Phenol was selectively nitrated in liquid phase to produce ortho-nitrophenol using dilute nitric acid (30%) at room temperature in presence of hydrochloric acid treated γ-alumina. Initially Al(NO3) and NH4HCO3 were reacted to prepare Al (OH)3 which on successive calcinations at 550 ᴼC for 5h produce γ-alumina. The γ-alumina was characterized by BET, XRD, SEM and NH3-TPD analysis. The XRD profile confirmed the crystalline structure of the solid acid catalyst γ-alumina. The NH3-TPD analysis showed the development of lewis acidity on the surface of hydrochloric acid treated γ-alumina. The effects of various parameters such as concentration of reactants, types of catalyst, weight of the catalyst, solvent, temperature and time of reaction have been studied. The kinetics of the reaction was also investigated.
Copy of Analysis of the Decomposition of Hydrogen Peroxide.pptxJohnny Mackey
1) The document analyzes the decomposition of hydrogen peroxide catalyzed by potassium manganate and potassium iodide at different temperatures. Rate constants, activation energies, and reaction rates were calculated from changes in pressure and temperature over time.
2) Temperature was found to affect the rate of catalytic decomposition, with higher temperatures corresponding to faster reaction rates. The activation energies calculated from the data matched literature values.
3) Reflections noted that more trials would be needed for accurate results and that complex research projects require significant effort to complete.
Optimization of temperature imposed on activator before mixinginventionjournals
International Journal of Engineering and Science Invention (IJESI) is an international journal intended for professionals and researchers in all fields of computer science and electronics. IJESI publishes research articles and reviews within the whole field Engineering Science and Technology, new teaching methods, assessment, validation and the impact of new technologies and it will continue to provide information on the latest trends and developments in this ever-expanding subject. The publications of papers are selected through double peer reviewed to ensure originality, relevance, and readability. The articles published in our journal can be accessed online.
Kinetics Etude of the Experimental Leaching of Sphalerite Using Acidic Lixivi...CrimsonPublishersAMMS
The influence of physico-chemical parameters such as acid concentration, temperature, particle size and time of leaching on the chemical dissolution of the sphalerite ore in sulfuric acid was examined. At a temperature of 358 K by 2 mol.l-1 H2SO4, a stirring speed of 300 rpm, initial solid / liquid ratio of 10 g/L and particle size (-125 +63^m), about 99 % of zinc was extracted inside 120min. The experimental data of this leaching technique was established by way of the shrinking core model under chemically reaction controlled processes, the corresponding activation energy for the recovery of zinc Ea calculated from the Arrhenius expression to be 18.63kJ/mole.
1. A catalyst is a substance that increases the rate of a chemical reaction without being consumed itself. It works by providing an alternative reaction pathway with a lower activation energy.
2. There are two types of catalysts: positive catalysts increase the rate of a reaction while negative catalysts decrease it. Catalysis can also be homogeneous, with reactants and catalyst in the same phase, or heterogeneous with different phases.
3. Catalysts have many industrial applications, like using iron to catalyze ammonia synthesis or platinum to produce sulfuric acid. They allow chemical processes to operate more efficiently and productively.
Removal of Coke during Steam Reforming of Ethanol over La-CoOx Catalystinventy
Research Inventy : International Journal of Engineering and Science is published by the group of young academic and industrial researchers with 12 Issues per year. It is an online as well as print version open access journal that provides rapid publication (monthly) of articles in all areas of the subject such as: civil, mechanical, chemical, electronic and computer engineering as well as production and information technology. The Journal welcomes the submission of manuscripts that meet the general criteria of significance and scientific excellence. Papers will be published by rapid process within 20 days after acceptance and peer review process takes only 7 days. All articles published in Research Inventy will be peer-reviewed.
This document summarizes research on using activated Strychnos Nux-Vomica L Nano Carbon to remove Chromium (VI) ions from aqueous solution. Batch adsorption experiments were conducted to determine the effect of parameters such as contact time, initial metal concentration, adsorbent dose, pH, interfering ions, and temperature on the adsorption process. The results showed that adsorption capacity increased with temperature, reached equilibrium within 40 minutes, and was most effective at low pH between 2-7. Kinetic and thermodynamic models indicated the adsorption was physical and endothermic in nature. Overall, the study demonstrated activated Strychnos Nux-Vomica L Nano Carbon to be an effective ad
This document summarizes an innovative strategy for a water supply project in Okpuno Town, Nigeria. It proposes using a community-based organization and linear programming to minimize costs. The strategy involves developing sustainable water services, providing safe water, improving public health, developing private sector support, and supplying water at the right price and quality. Linear programming is used to optimally allocate limited funds between training workers for project implementation and ongoing maintenance. The optimal solution allocates most funds to training workers for project implementation. An empowered, community-based organization is best to ensure long-term sustainability through local ownership, responsibility and commitment.
The document describes a study that fabricated Al-10% Al2O3-10% ZrO2 nanocomposite powders using high-energy ball milling. The powders were milled for various time periods up to 45 hours. Characterization of the milled powders found that milling resulted in a uniform distribution of the Al2O3 and ZrO2 reinforcements in the Al matrix. X-ray diffraction analysis showed increased peak broadening with longer milling times, indicating reduced crystallite size and increased lattice strain. Crystallite size measurements found sizes decreased to around 25 nm after 45 hours of milling. Scanning electron microscopy images confirmed the uniform distribution of reinforcements and decreasing particle size
This document discusses the IEEE 802.3ba standard for Ethernet speeds of 40 Gbps and 100 Gbps. It describes the objectives of the standard to support speeds faster than 10 Gbps. The standard defines physical layer specifications for 40 Gbps and 100 Gbps transfer rates, including defining new Ethernet physical layer devices, sublayers, and interfaces to support these higher speeds.
IJERA (International journal of Engineering Research and Applications) is International online, ... peer reviewed journal. For more detail or submit your article, please visit www.ijera.com
This document examines the reactivity of cement combinations containing Portland cement, fly ash, silica fume, and metakaolin by investigating their calcium hydroxide (Ca(OH)2) consumption. Various binary and ternary cement pastes were tested at ages of 28, 90, and 180 days. The results show that silica fume consumed the most Ca(OH)2, followed by metakaolin, then fly ash. Ca(OH)2 consumption increased with age and addition content up to certain limits. Combinations with finer pozzolans like silica fume and metakaolin showed higher reactivity, especially at early ages.
IJERA (International journal of Engineering Research and Applications) is International online, ... peer reviewed journal. For more detail or submit your article, please visit www.ijera.com
Abstract— Thermally Simulated Depolarization Current measurement is an excellent but not widely used method for identifying relaxation processes in polymers. The TSDC method is used here to analyze the molecular movements in biopolymers. Differential Scanning Calorimetry is a technique used to measure thermal properties of polymers based on the rate at which they absorb heat energy compared to a reference material. The two techniques take advantage of the energy changes involved in the various phase transitions of certain polymer molecules. This allows for several properties of the material to be ascertained; melting points, enthalpies of melting, crystallization temperatures, glass transition temperatures and degradation temperatures. The examined biopolymer films are made from biological materials such as proteins and polysaccharides. These materials have gained wide usage in pharmaceutical, medical and food areas. The uses of biopolymer films depend on their structure and mechanical properties. This work is based on three types of alginate, and gelatin films. The films were prepared by casting. The casting technique used aqueous solutions in each case of sample preparation. The manufacturing process of the sodium alginate and gelatin films was a single stage solving process, and for the calcium alginate and alginic acid have a chemical reaction process.
The document discusses MOCVD (Metalorganic Chemical Vapor Deposition) technology and material growth. It covers the MOCVD growth system, common metalorganic compounds used as sources, gas phase and surface reactions during growth, characterization techniques for analyzing materials, and some issues related to growing GaN and related materials by MOCVD.
This document summarizes a study on the effect of various synthesis parameters on the setting time and workability of fly ash-based geopolymer paste and mortar. Specifically, it examines the effect of alkali content (Na2O/Al2O3 ratio), silica content (SiO2/Al2O3 ratio), and water-to-binder ratio. The study found that initial and final setting time decreased with increasing alkali content and water-to-binder ratio, but increased with increasing silica content. Workability, as measured by flow table tests, also decreased with higher alkali content and water-to-binder ratio. The results provide an understanding of how synthesis parameters influence
Dealumination and Na activation of natural zeolite for CO2 adsorption on biogasIJERD Editor
In this study, natural zeolites from the Philippines were modified using NaOH heat treatment and NaCl hydrothermal process. Pre-treatment using ferro-filtering and dealumination using different concentrations of HCl acid leaching were prepared prior to sodium activation. Heat treatment was performed using 5M NaOH at 80 °C for 72 hrs while 3 cycle hydrothermal process was performed using 5M NaCl at 10 psi for 1 hr. Diffraction pattern from XRD showed Heulandite (HEU) – Clinoptilolite (CLI) and Mordenite (MOR) framework for raw and acid pre-treated zeolites.
Synthesis and Characterization of Atmospheric Residue Hydrodemetalization (Ar...IOSR Journals
This document describes the synthesis and characterization of an atmospheric residue hydrodemetalization (ARDHM) catalyst for crude oil processing using Indonesian natural zeolite. The zeolite was treated with HCl to increase acidity and then loaded with nickel and molybdenum metals via impregnation. Characterization showed the metals did not block pores or degrade crystallinity and increased acidity. Testing on model compounds like nickel porphyrin, thiophene and pyridine showed the catalyst effectively removed metals and sulfur at temperatures of 360-390°C. The spent catalyst was deactivated by coke deposition but could be regenerated through burning off the coke.
Studies on Nitration of Phenol over Solid Acid Catalyst by Lipika Das, Koushi...crimsonpublisherspps
- Phenol was selectively nitrated to ortho-nitrophenol using dilute nitric acid over gamma-alumina catalyst in liquid phase at room temperature.
- Gamma-alumina was prepared using a controlled precipitation method and characterized using various techniques which showed it had suitable properties for nitration.
- Parameters like concentration of reactants, weight of catalyst, solvent, temperature and time were varied to determine their effect on the reaction. Kinetics of the reaction were also studied.
nano catalysis as a prospectus of green chemistry Ankit Grover
Nanocatalysis and green chemistry prospects.
Nanocatalysts have higher activity, selectivity, and efficiency than traditional catalysts due to their high surface area to volume ratio. They can be designed for sustainability by having properties like recyclability, durability, and cost-effectiveness. Examples discussed include gold nanoparticle catalysts for oxidation reactions and magnetically separable nanoparticle catalysts. Nanocatalyst applications highlighted are water splitting for hydrogen production and storage, and fuel cells.
International Journal of Engineering Research and Applications (IJERA) is an open access online peer reviewed international journal that publishes research and review articles in the fields of Computer Science, Neural Networks, Electrical Engineering, Software Engineering, Information Technology, Mechanical Engineering, Chemical Engineering, Plastic Engineering, Food Technology, Textile Engineering, Nano Technology & science, Power Electronics, Electronics & Communication Engineering, Computational mathematics, Image processing, Civil Engineering, Structural Engineering, Environmental Engineering, VLSI Testing & Low Power VLSI Design etc.
Studies on Nitration of Phenol over Solid Acid Catalyst | Crimson PublishersDanesBlake
Phenol was selectively nitrated in liquid phase to produce ortho-nitrophenol using dilute nitric acid (30%) at room temperature in presence of hydrochloric acid treated γ-alumina. Initially Al(NO3) and NH4HCO3 were reacted to prepare Al (OH)3 which on successive calcinations at 550 ᴼC for 5h produce γ-alumina. The γ-alumina was characterized by BET, XRD, SEM and NH3-TPD analysis. The XRD profile confirmed the crystalline structure of the solid acid catalyst γ-alumina. The NH3-TPD analysis showed the development of lewis acidity on the surface of hydrochloric acid treated γ-alumina. The effects of various parameters such as concentration of reactants, types of catalyst, weight of the catalyst, solvent, temperature and time of reaction have been studied. The kinetics of the reaction was also investigated.
Copy of Analysis of the Decomposition of Hydrogen Peroxide.pptxJohnny Mackey
1) The document analyzes the decomposition of hydrogen peroxide catalyzed by potassium manganate and potassium iodide at different temperatures. Rate constants, activation energies, and reaction rates were calculated from changes in pressure and temperature over time.
2) Temperature was found to affect the rate of catalytic decomposition, with higher temperatures corresponding to faster reaction rates. The activation energies calculated from the data matched literature values.
3) Reflections noted that more trials would be needed for accurate results and that complex research projects require significant effort to complete.
Optimization of temperature imposed on activator before mixinginventionjournals
International Journal of Engineering and Science Invention (IJESI) is an international journal intended for professionals and researchers in all fields of computer science and electronics. IJESI publishes research articles and reviews within the whole field Engineering Science and Technology, new teaching methods, assessment, validation and the impact of new technologies and it will continue to provide information on the latest trends and developments in this ever-expanding subject. The publications of papers are selected through double peer reviewed to ensure originality, relevance, and readability. The articles published in our journal can be accessed online.
Kinetics Etude of the Experimental Leaching of Sphalerite Using Acidic Lixivi...CrimsonPublishersAMMS
The influence of physico-chemical parameters such as acid concentration, temperature, particle size and time of leaching on the chemical dissolution of the sphalerite ore in sulfuric acid was examined. At a temperature of 358 K by 2 mol.l-1 H2SO4, a stirring speed of 300 rpm, initial solid / liquid ratio of 10 g/L and particle size (-125 +63^m), about 99 % of zinc was extracted inside 120min. The experimental data of this leaching technique was established by way of the shrinking core model under chemically reaction controlled processes, the corresponding activation energy for the recovery of zinc Ea calculated from the Arrhenius expression to be 18.63kJ/mole.
1. A catalyst is a substance that increases the rate of a chemical reaction without being consumed itself. It works by providing an alternative reaction pathway with a lower activation energy.
2. There are two types of catalysts: positive catalysts increase the rate of a reaction while negative catalysts decrease it. Catalysis can also be homogeneous, with reactants and catalyst in the same phase, or heterogeneous with different phases.
3. Catalysts have many industrial applications, like using iron to catalyze ammonia synthesis or platinum to produce sulfuric acid. They allow chemical processes to operate more efficiently and productively.
Removal of Coke during Steam Reforming of Ethanol over La-CoOx Catalystinventy
Research Inventy : International Journal of Engineering and Science is published by the group of young academic and industrial researchers with 12 Issues per year. It is an online as well as print version open access journal that provides rapid publication (monthly) of articles in all areas of the subject such as: civil, mechanical, chemical, electronic and computer engineering as well as production and information technology. The Journal welcomes the submission of manuscripts that meet the general criteria of significance and scientific excellence. Papers will be published by rapid process within 20 days after acceptance and peer review process takes only 7 days. All articles published in Research Inventy will be peer-reviewed.
This document summarizes research on using activated Strychnos Nux-Vomica L Nano Carbon to remove Chromium (VI) ions from aqueous solution. Batch adsorption experiments were conducted to determine the effect of parameters such as contact time, initial metal concentration, adsorbent dose, pH, interfering ions, and temperature on the adsorption process. The results showed that adsorption capacity increased with temperature, reached equilibrium within 40 minutes, and was most effective at low pH between 2-7. Kinetic and thermodynamic models indicated the adsorption was physical and endothermic in nature. Overall, the study demonstrated activated Strychnos Nux-Vomica L Nano Carbon to be an effective ad
This document summarizes an innovative strategy for a water supply project in Okpuno Town, Nigeria. It proposes using a community-based organization and linear programming to minimize costs. The strategy involves developing sustainable water services, providing safe water, improving public health, developing private sector support, and supplying water at the right price and quality. Linear programming is used to optimally allocate limited funds between training workers for project implementation and ongoing maintenance. The optimal solution allocates most funds to training workers for project implementation. An empowered, community-based organization is best to ensure long-term sustainability through local ownership, responsibility and commitment.
The document describes a study that fabricated Al-10% Al2O3-10% ZrO2 nanocomposite powders using high-energy ball milling. The powders were milled for various time periods up to 45 hours. Characterization of the milled powders found that milling resulted in a uniform distribution of the Al2O3 and ZrO2 reinforcements in the Al matrix. X-ray diffraction analysis showed increased peak broadening with longer milling times, indicating reduced crystallite size and increased lattice strain. Crystallite size measurements found sizes decreased to around 25 nm after 45 hours of milling. Scanning electron microscopy images confirmed the uniform distribution of reinforcements and decreasing particle size
This document discusses the IEEE 802.3ba standard for Ethernet speeds of 40 Gbps and 100 Gbps. It describes the objectives of the standard to support speeds faster than 10 Gbps. The standard defines physical layer specifications for 40 Gbps and 100 Gbps transfer rates, including defining new Ethernet physical layer devices, sublayers, and interfaces to support these higher speeds.
IJERA (International journal of Engineering Research and Applications) is International online, ... peer reviewed journal. For more detail or submit your article, please visit www.ijera.com
This document examines the reactivity of cement combinations containing Portland cement, fly ash, silica fume, and metakaolin by investigating their calcium hydroxide (Ca(OH)2) consumption. Various binary and ternary cement pastes were tested at ages of 28, 90, and 180 days. The results show that silica fume consumed the most Ca(OH)2, followed by metakaolin, then fly ash. Ca(OH)2 consumption increased with age and addition content up to certain limits. Combinations with finer pozzolans like silica fume and metakaolin showed higher reactivity, especially at early ages.
IJERA (International journal of Engineering Research and Applications) is International online, ... peer reviewed journal. For more detail or submit your article, please visit www.ijera.com
International Journal of Engineering Research and Applications (IJERA) is an open access online peer reviewed international journal that publishes research and review articles in the fields of Computer Science, Neural Networks, Electrical Engineering, Software Engineering, Information Technology, Mechanical Engineering, Chemical Engineering, Plastic Engineering, Food Technology, Textile Engineering, Nano Technology & science, Power Electronics, Electronics & Communication Engineering, Computational mathematics, Image processing, Civil Engineering, Structural Engineering, Environmental Engineering, VLSI Testing & Low Power VLSI Design etc.
International Journal of Engineering Research and Applications (IJERA) is an open access online peer reviewed international journal that publishes research and review articles in the fields of Computer Science, Neural Networks, Electrical Engineering, Software Engineering, Information Technology, Mechanical Engineering, Chemical Engineering, Plastic Engineering, Food Technology, Textile Engineering, Nano Technology & science, Power Electronics, Electronics & Communication Engineering, Computational mathematics, Image processing, Civil Engineering, Structural Engineering, Environmental Engineering, VLSI Testing & Low Power VLSI Design etc.
1) O documento discute histórias contrafactuais da ciência, ou seja, histórias possíveis que não se concretizaram.
2) O autor propõe mapear as influências entre avanços científicos de 1850 a 1915 que levaram ao surgimento da física quântica, usando inteligência artificial, para possibilitar a construção de histórias contrafactuais plausíveis.
3) O estudo de caso é o surgimento da física quântica a partir da segunda metade do século XIX, com f
El documento presenta el organigrama de una organización política, incluyendo los nombres de los líderes directivos, miembros del consejo, coordinadores provinciales, jefes de departamentos temáticos, y directivos de las secciones de universitarios y mujeres.
Este documento apresenta a programação oficial do evento "Bote Fé" no Maranhão, que inclui a recepção e peregrinação da Cruz e do Ícone de Nossa Senhora pelas principais comunidades da Arquidiocese de São Luís entre os dias 27 a 30 de abril de 2012, incluindo missas, shows, visitas a locais como a UFMA, hospital e presídio.
O documento discute a transformação IHS para descrever propriedades de cor em imagens e sua aplicação para fusão de imagens de diferentes resoluções espaciais, apresentando exemplos de imagens LANDSAT, Quickbird, WorldView-2 e Geoeye.
O documento lista vários projetos de design gráfico realizados para clientes de diferentes setores, incluindo desenvolvimento de marcas, materiais de marketing, embalagens e sites. É fornecido o contato de uma agência de design e exemplificados trabalhos como folders, banners e anúncios.
A Central procura pessoas especializadas em Web Rádio para atuar como locutor ou Sam Broadcaster. Os interessados devem entrar no chat "tc" para mais informações.
Diapositivas contabilidad sistematizada ii bnKAREN ACOSTA
La Unión Europea ha acordado un embargo petrolero contra Rusia en respuesta a la invasión de Ucrania. El embargo prohibirá las importaciones marítimas de petróleo ruso a la UE y pondrá fin a las entregas a través de oleoductos dentro de seis meses. Esta medida forma parte de un sexto paquete de sanciones de la UE destinadas a aumentar la presión económica sobre Moscú y privar al Kremlin de fondos para financiar su guerra.
El resumen describe la agenda del día para la clase 4°A. Comienzan repasando cómo abrir la plataforma educativa y crear carpetas y subir archivos. Luego aprenden a subir archivos al buzón de correo electrónico de la escuela y a enviar adjuntos por correo electrónico. Finalizan copiando apuntes y conversando antes del recreo.
Describe la revelación profética de principados y maldiciones que están hoy sobre Venezuela y muchas naciones. Estos principados tienen cuativa tambien a la Iglesia por causa de su ignorancia
Rua na contramão a rua como espaço da diversidadeisacguimaraesjr
Este documento discute a noção de "estado de rua" e como as ruas podem ser espaços que acolhem diversidade e atividades não convencionais. Primeiramente, analisa autores que discutem o papel social da rua e como ela pode acolher aspectos da casa. Também reflete sobre como certos usos podem transformar uma rua em um espaço aberto à produção de novos significados. Por fim, propõe pensar em uma "política da rua" que permita a coexistência de fluxos heterogêneos nos espaços urbanos.
El documento presenta una colección de enlaces relacionados con la interculturalidad y la educación intercultural. Incluye sitios web sobre cuentos de diferentes culturas, artículos sobre problemas de idioma y oportunidades culturales para estudiantes inmigrantes, organizaciones que promueven la diversidad lingüística y la educación intercultural, videos sobre migraciones y culturas del mundo, y blogs sobre aprendizaje y enseñanza intercultural.
IRJET- Feasibility Studies on Electricity Generation from Dairy Wastewater u...IRJET Journal
This document summarizes a study on electricity generation from dairy wastewater using a microbial fuel cell (MFC). Dairy effluent was used as the substrate in a dual chamber MFC with a copper electrode and agar-NaCl salt bridge. Maximum efficiencies of 71.7%, 67.6%, 49.7%, 43.8%, and 68.9% were achieved in removing COD, BOD, EC, TDS, and oil/grease respectively with a 6 hour detention time. This setup generated a maximum power of 55.118 μW and electrical energy of 0.0992124 W-sec, demonstrating that MFCs can effectively treat dairy wastewater while also generating off-
Manufacture of caustic soda and chlorine using electrolysis process ...Ankush Gupta
This document discusses the manufacture of chlorine and caustic soda using electrolysis processes. It provides background on the chlor-alkali industry and describes the three main electrolysis processes: diaphragm cell, mercury cell, and membrane cell. The membrane cell process is highlighted as the most energy efficient and environmentally friendly option. Properties and production details of chlorine, caustic soda, and hydrogen are also outlined. A literature review covers previous research on improving chlor-alkali cell efficiency and treating wastewater from the process.
Microwave dehydrator an environmental friendly step toward improving microwav...eSAT Publishing House
This document summarizes research on using a microwave dehydrator system to improve the demulsification of petroleum emulsions. The system consists of a modified microwave oven and silicone-based chemical demulsifiers. Experimental emulsions with varying water content and additive concentration were tested. Results showed the microwave dehydrator can maximize water separation within 2 minutes of irradiation, using 0.1% additive concentration. This improves on conventional demulsification techniques by reducing chemical and processing costs while avoiding their environmental impacts. The microwave treatment works by heating the emulsion and neutralizing interfacial forces between water droplets, aiding their separation.
This document describes a student project to study microbial fuel cells (MFCs) for treating wastewater and generating electricity. The objectives are to construct an MFC setup, select microbes, optimize conditions, and analyze COD reduction and voltage generation from treating distillery wastewater. The team constructed a dual-chamber MFC with graphite electrodes. Testing on synthetic wastewater showed voltage increased over time and with higher COD loads. Distillery wastewater trials achieved up to 72% COD reduction and 250mV voltage after 12 days. While power generation was low, the study demonstrated MFC feasibility for wastewater treatment and identified areas for further optimization and scale-up.
Material Science and Engineering-B_Synthesis of ultra high molecular weight p...Shashi Kant
This document summarizes an article that appeared in a journal published by Elsevier. The attached copy is provided to the author for non-commercial research and education purposes only. The author is permitted to share the copy with colleagues and use it for teaching. However, reproducing, distributing, selling, licensing or posting the copy online is prohibited without permission from Elsevier. The authors are allowed to post their version of the article in Word or Tex format on their personal or institutional websites. Further information about Elsevier's archiving and manuscript policies can be found online.
Effect of Fast Pyrolysis Operating Conditions on Product Yield of Red Meranti...IRJET Journal
1) The document investigates the effect of operating conditions on product yield from fast pyrolysis of red meranti sawdust.
2) It finds that bio-oil yield is maximized at 450°C, a nitrogen flow rate of 25 L/min, and a retention time of 60 minutes for sawdust particles sized 0.3 mm.
3) Temperature has the strongest influence on bio-oil yield, followed by nitrogen flow rate and retention time, while particle size has a negligible effect.
1) The document discusses using nanofluids as a coolant in nuclear reactor fuel rods to improve heat transfer efficiency. Nanofluids are fluids containing nanoparticles that have higher thermal conductivity than conventional fluids.
2) A simulation was conducted modeling a nuclear fuel rod cooled by water and a nanofluid (water with 3% aluminum oxide nanoparticles). Results showed a 225% increase in heat extracted from the fuel rod when using nanofluids.
3) This increased heat extraction could reduce the required amount of uranium used in the reactor by 4.8%, providing economic benefits.
1) The document discusses the preparation and characterization of carbon nanotubes (CNTs) grown on a Co-Mo substrate using chemical vapor deposition (CVD).
2) CNTs were grown using different concentration ratios of Co-Mo catalyst at temperatures of 400°C, 500°C and 600°C.
3) Scanning electron microscopy analysis showed the CNT diameters and lengths varied depending on the catalyst concentration ratio and temperature used, with the best results obtained at a 2:1 Co-Mo ratio and 400°C temperature.
Optimization of Corynebacterium glutamicum Immobilization on Alginate and In...IJMER
The parameters of the immobilized process of Corynebacterium glutamicum VTCC – B – 0632
on alginate were identified by Plackett-Burman matrix, and the experiments were designed by response
surface methodology having the central composite designs (RSM-CCD). The maximum yield of cell
immobilization on alginate carrier reached at 92.6%. Optimal parameters were the cell density of 89.3
million cells/mL in the 4% sterile alginate with ratio 1:1. This mixture went through the syringe system of
the 2M CaCl2 solution at 200C with the shaking speed of 75 rpm until the gels get in shape. Then, these
gels were soaked in the CaCl2 liquor and shaken for 41 minutes (150 rpm). At last, the particle size of
final products was 4mm and the average cell density was 14.75 million cells/gram. This immobile product
is maintained under the suitable condition in the CaCl2 liquor (w/v), pH=7. The cell survival percentage
after 72 hours were 98% when it was stored in 4
0C, 0.5% CaCl2 and pH of 7
The document summarizes research into the effect of different catalysts on the conversion of plastic waste to fuel oil through pyrolysis. Experiments were conducted pyrolyzing plastic waste with four catalysts (sodium carbonate, calcium carbonate, zinc oxide, zeolite) at 500°C. Zeolite produced the highest yield of fuel oil at 15.2% while zinc oxide had the lowest yield at 13.77%. The properties of the resulting fuel oils were analyzed and showed varying results depending on the catalyst used, with zeolite producing oil most similar to diesel. FTIR analysis identified various functional groups in the produced oils.
Deactivation Modeling through Separable Kinetics of Coking On Ni/CZ Catalyst ...IOSR Journals
Abstract : Steam methane reforming (SMR) is a very significant technique to produce hydrogen from fossil fuels. In this particular work, nickel is used as the active metal and ceria-zirconia (CZ) bi-metallic oxide is used as the support. The foremost challenge to this process is sooting or coking over the catalyst surface and blocking the active sites. For the economic viability of the catalyst, it is very significant to make it coke deposition resistant. This is the reason that the kinetic modeling of the deactivation is very important. Therefore, this paper is aimed to model the deactivation and activity of the catalyst. A rate model of the deactivation process is also developed using separable kinetics. A comparison with commercial catalyst is also reported to show that the Ni/CZ catalyst is much more stable towards the coking. Keywords –Coking, Deactivation, Methane, Separable kinetics, Steam reforming.
This document discusses microwave-assisted pyrolysis of plastic waste. It begins by introducing the problem of increasing plastic waste and discusses pyrolysis as a potential solution. It then describes the design of a microwave reactor for pyrolyzing plastic waste, with a quartz reactor vessel and ability to heat using microwaves. Experiments were conducted with a mixture of plastics and carbon black as the microwave absorber. Products were analyzed using various techniques and the char was characterized. The results suggest microwave pyrolysis may be an effective way to treat plastic waste.
Sol gel synthesis and characterization of lithium yttrium oxideeSAT Journals
Abstract Lithium yttrium oxide LiYO2 was synthesized for the first time by a simple citric acid-assisted sol-gel method. Three different molar ratios from low to high concentration of lithium precursor were used. The higher lithium precursor content provided purer LiYO2 powders, which were obtained by calcining the amorphous powders from the sol-gel process at lower temperature, compared to those synthesized by solid-state reaction. The optimum experimental conditions for sol-gel preparation process is 1:3 and 1:2 molar ratio of [Li(CH3COO]∙2H2O]/[Y(NO3)3∙6H2O] at 950°C and 1000°C respectively, with 6 hours of holding time. The reaction and synthesis mechanism for LiYO2 was analyzes and proposed. It was found that the calcination of dried gel generated exothermic reactions and synthesize of LiYO2 was performed by simple reaction of Li2O and Y2O3. Keywords: Lithium yttrium oxide (LiYO2), Sol–gel synthesis, mechanism.
Fabrication and characterization of conducting polymer compositeijoejournal
The document summarizes research on fabricating and characterizing a conducting polymer composite of polyvinylpyrrolidone (PVP) and potassium hydroxide (KOH). Specifically:
1. PVP and KOH were mixed using a solution casting method to prepare polymer composite specimens.
2. Tests found that the composite's conductivity and microhardness increased with higher KOH concentrations. The highest conductivity was 4×10-4 S/cm at 35 wt% KOH.
3. Microstructure analysis using an optical microscope showed even KOH distribution throughout the composite at 35 wt% KOH, the concentration with highest conductivity.
The document discusses the conversion of waste plastics into fuel through a thermal degradation process without using catalysts or chemicals. None coded waste plastics are subjected to thermal cracking in a muffle furnace at 420°C and in a reactor from 300-420°C. This produces 85% liquid fuel, 9% light gases, and 6% carbon residue. Analysis of the produced fuel using GC/MS and FT-IR found it contains hydrocarbon compounds ranging from C3-C28, including alkanes and alkenes that could be used as a fuel or feedstock.
This document discusses linear low density polyethylene (LLDPE) films and the role of additives in LLDPE films. It provides background on the production of polyethylene through different processes. It then focuses on LLDPE, describing its production methods, physical characteristics, and common uses in packaging films. The document outlines various types of additives used in LLDPE films, specifically mentioning antioxidants and masterbatches, which are concentrates of additives that enhance polymer properties for specific applications.
IRJET- Performance Evaluation of Anaerobic Digestion of Food WasteIRJET Journal
This document summarizes research evaluating the performance of anaerobic digestion of food waste. The study used a batch digester with a 20 L capacity to digest a mixture of cow dung, inoculum, and water, as well as food waste collected from a hostel. Parameters like pH, temperature, volatile fatty acids, alkalinity, chemical oxygen demand, and volatile suspended solids were analyzed. Results showed biogas production was highest at a pH of 7.8 and temperatures between 35-38°C. Chemical oxygen demand removal and biogas production were positively correlated. Maximum biogas production of 7,750 ml/day occurred at an organic loading rate of 1.0 g volatile suspended solids/L/day
This document describes the preparation of a CuO@Al2O3 hybrid catalyst for photocatalytic activity. It aims to synthesize Al2O3 as a support material, prepare CuO hybrids with Al2O3 at different weight percentages using impregnation, and test the photocatalytic activity of the hybrids on different dyes. The methodology involves synthesizing Al2O3 via precipitation, adding CuO at ratios of 9:1, 8:2, 7:3, and 6:4, and testing dye degradation under UV light. Results found the 7:3 ratio degraded bromo cresol green the most effectively.
IJRET : International Journal of Research in Engineering and Technology is an international peer reviewed, online journal published by eSAT Publishing House for the enhancement of research in various disciplines of Engineering and Technology. The aim and scope of the journal is to provide an academic medium and an important reference for the advancement and dissemination of research results that support high-level learning, teaching and research in the fields of Engineering and Technology. We bring together Scientists, Academician, Field Engineers, Scholars and Students of related fields of Engineering and Technology
Skybuffer SAM4U tool for SAP license adoptionTatiana Kojar
Manage and optimize your license adoption and consumption with SAM4U, an SAP free customer software asset management tool.
SAM4U, an SAP complimentary software asset management tool for customers, delivers a detailed and well-structured overview of license inventory and usage with a user-friendly interface. We offer a hosted, cost-effective, and performance-optimized SAM4U setup in the Skybuffer Cloud environment. You retain ownership of the system and data, while we manage the ABAP 7.58 infrastructure, ensuring fixed Total Cost of Ownership (TCO) and exceptional services through the SAP Fiori interface.
The Microsoft 365 Migration Tutorial For Beginner.pptxoperationspcvita
This presentation will help you understand the power of Microsoft 365. However, we have mentioned every productivity app included in Office 365. Additionally, we have suggested the migration situation related to Office 365 and how we can help you.
You can also read: https://www.systoolsgroup.com/updates/office-365-tenant-to-tenant-migration-step-by-step-complete-guide/
Have you ever been confused by the myriad of choices offered by AWS for hosting a website or an API?
Lambda, Elastic Beanstalk, Lightsail, Amplify, S3 (and more!) can each host websites + APIs. But which one should we choose?
Which one is cheapest? Which one is fastest? Which one will scale to meet our needs?
Join me in this session as we dive into each AWS hosting service to determine which one is best for your scenario and explain why!
Introduction of Cybersecurity with OSS at Code Europe 2024Hiroshi SHIBATA
I develop the Ruby programming language, RubyGems, and Bundler, which are package managers for Ruby. Today, I will introduce how to enhance the security of your application using open-source software (OSS) examples from Ruby and RubyGems.
The first topic is CVE (Common Vulnerabilities and Exposures). I have published CVEs many times. But what exactly is a CVE? I'll provide a basic understanding of CVEs and explain how to detect and handle vulnerabilities in OSS.
Next, let's discuss package managers. Package managers play a critical role in the OSS ecosystem. I'll explain how to manage library dependencies in your application.
I'll share insights into how the Ruby and RubyGems core team works to keep our ecosystem safe. By the end of this talk, you'll have a better understanding of how to safeguard your code.
Dandelion Hashtable: beyond billion requests per second on a commodity serverAntonios Katsarakis
This slide deck presents DLHT, a concurrent in-memory hashtable. Despite efforts to optimize hashtables, that go as far as sacrificing core functionality, state-of-the-art designs still incur multiple memory accesses per request and block request processing in three cases. First, most hashtables block while waiting for data to be retrieved from memory. Second, open-addressing designs, which represent the current state-of-the-art, either cannot free index slots on deletes or must block all requests to do so. Third, index resizes block every request until all objects are copied to the new index. Defying folklore wisdom, DLHT forgoes open-addressing and adopts a fully-featured and memory-aware closed-addressing design based on bounded cache-line-chaining. This design offers lock-free index operations and deletes that free slots instantly, (2) completes most requests with a single memory access, (3) utilizes software prefetching to hide memory latencies, and (4) employs a novel non-blocking and parallel resizing. In a commodity server and a memory-resident workload, DLHT surpasses 1.6B requests per second and provides 3.5x (12x) the throughput of the state-of-the-art closed-addressing (open-addressing) resizable hashtable on Gets (Deletes).
Driving Business Innovation: Latest Generative AI Advancements & Success StorySafe Software
Are you ready to revolutionize how you handle data? Join us for a webinar where we’ll bring you up to speed with the latest advancements in Generative AI technology and discover how leveraging FME with tools from giants like Google Gemini, Amazon, and Microsoft OpenAI can supercharge your workflow efficiency.
During the hour, we’ll take you through:
Guest Speaker Segment with Hannah Barrington: Dive into the world of dynamic real estate marketing with Hannah, the Marketing Manager at Workspace Group. Hear firsthand how their team generates engaging descriptions for thousands of office units by integrating diverse data sources—from PDF floorplans to web pages—using FME transformers, like OpenAIVisionConnector and AnthropicVisionConnector. This use case will show you how GenAI can streamline content creation for marketing across the board.
Ollama Use Case: Learn how Scenario Specialist Dmitri Bagh has utilized Ollama within FME to input data, create custom models, and enhance security protocols. This segment will include demos to illustrate the full capabilities of FME in AI-driven processes.
Custom AI Models: Discover how to leverage FME to build personalized AI models using your data. Whether it’s populating a model with local data for added security or integrating public AI tools, find out how FME facilitates a versatile and secure approach to AI.
We’ll wrap up with a live Q&A session where you can engage with our experts on your specific use cases, and learn more about optimizing your data workflows with AI.
This webinar is ideal for professionals seeking to harness the power of AI within their data management systems while ensuring high levels of customization and security. Whether you're a novice or an expert, gain actionable insights and strategies to elevate your data processes. Join us to see how FME and AI can revolutionize how you work with data!
Digital Banking in the Cloud: How Citizens Bank Unlocked Their MainframePrecisely
Inconsistent user experience and siloed data, high costs, and changing customer expectations – Citizens Bank was experiencing these challenges while it was attempting to deliver a superior digital banking experience for its clients. Its core banking applications run on the mainframe and Citizens was using legacy utilities to get the critical mainframe data to feed customer-facing channels, like call centers, web, and mobile. Ultimately, this led to higher operating costs (MIPS), delayed response times, and longer time to market.
Ever-changing customer expectations demand more modern digital experiences, and the bank needed to find a solution that could provide real-time data to its customer channels with low latency and operating costs. Join this session to learn how Citizens is leveraging Precisely to replicate mainframe data to its customer channels and deliver on their “modern digital bank” experiences.
Discover top-tier mobile app development services, offering innovative solutions for iOS and Android. Enhance your business with custom, user-friendly mobile applications.
Conversational agents, or chatbots, are increasingly used to access all sorts of services using natural language. While open-domain chatbots - like ChatGPT - can converse on any topic, task-oriented chatbots - the focus of this paper - are designed for specific tasks, like booking a flight, obtaining customer support, or setting an appointment. Like any other software, task-oriented chatbots need to be properly tested, usually by defining and executing test scenarios (i.e., sequences of user-chatbot interactions). However, there is currently a lack of methods to quantify the completeness and strength of such test scenarios, which can lead to low-quality tests, and hence to buggy chatbots.
To fill this gap, we propose adapting mutation testing (MuT) for task-oriented chatbots. To this end, we introduce a set of mutation operators that emulate faults in chatbot designs, an architecture that enables MuT on chatbots built using heterogeneous technologies, and a practical realisation as an Eclipse plugin. Moreover, we evaluate the applicability, effectiveness and efficiency of our approach on open-source chatbots, with promising results.
Ivanti’s Patch Tuesday breakdown goes beyond patching your applications and brings you the intelligence and guidance needed to prioritize where to focus your attention first. Catch early analysis on our Ivanti blog, then join industry expert Chris Goettl for the Patch Tuesday Webinar Event. There we’ll do a deep dive into each of the bulletins and give guidance on the risks associated with the newly-identified vulnerabilities.
5th LF Energy Power Grid Model Meet-up SlidesDanBrown980551
5th Power Grid Model Meet-up
It is with great pleasure that we extend to you an invitation to the 5th Power Grid Model Meet-up, scheduled for 6th June 2024. This event will adopt a hybrid format, allowing participants to join us either through an online Mircosoft Teams session or in person at TU/e located at Den Dolech 2, Eindhoven, Netherlands. The meet-up will be hosted by Eindhoven University of Technology (TU/e), a research university specializing in engineering science & technology.
Power Grid Model
The global energy transition is placing new and unprecedented demands on Distribution System Operators (DSOs). Alongside upgrades to grid capacity, processes such as digitization, capacity optimization, and congestion management are becoming vital for delivering reliable services.
Power Grid Model is an open source project from Linux Foundation Energy and provides a calculation engine that is increasingly essential for DSOs. It offers a standards-based foundation enabling real-time power systems analysis, simulations of electrical power grids, and sophisticated what-if analysis. In addition, it enables in-depth studies and analysis of the electrical power grid’s behavior and performance. This comprehensive model incorporates essential factors such as power generation capacity, electrical losses, voltage levels, power flows, and system stability.
Power Grid Model is currently being applied in a wide variety of use cases, including grid planning, expansion, reliability, and congestion studies. It can also help in analyzing the impact of renewable energy integration, assessing the effects of disturbances or faults, and developing strategies for grid control and optimization.
What to expect
For the upcoming meetup we are organizing, we have an exciting lineup of activities planned:
-Insightful presentations covering two practical applications of the Power Grid Model.
-An update on the latest advancements in Power Grid -Model technology during the first and second quarters of 2024.
-An interactive brainstorming session to discuss and propose new feature requests.
-An opportunity to connect with fellow Power Grid Model enthusiasts and users.
Freshworks Rethinks NoSQL for Rapid Scaling & Cost-EfficiencyScyllaDB
Freshworks creates AI-boosted business software that helps employees work more efficiently and effectively. Managing data across multiple RDBMS and NoSQL databases was already a challenge at their current scale. To prepare for 10X growth, they knew it was time to rethink their database strategy. Learn how they architected a solution that would simplify scaling while keeping costs under control.
zkStudyClub - LatticeFold: A Lattice-based Folding Scheme and its Application...Alex Pruden
Folding is a recent technique for building efficient recursive SNARKs. Several elegant folding protocols have been proposed, such as Nova, Supernova, Hypernova, Protostar, and others. However, all of them rely on an additively homomorphic commitment scheme based on discrete log, and are therefore not post-quantum secure. In this work we present LatticeFold, the first lattice-based folding protocol based on the Module SIS problem. This folding protocol naturally leads to an efficient recursive lattice-based SNARK and an efficient PCD scheme. LatticeFold supports folding low-degree relations, such as R1CS, as well as high-degree relations, such as CCS. The key challenge is to construct a secure folding protocol that works with the Ajtai commitment scheme. The difficulty, is ensuring that extracted witnesses are low norm through many rounds of folding. We present a novel technique using the sumcheck protocol to ensure that extracted witnesses are always low norm no matter how many rounds of folding are used. Our evaluation of the final proof system suggests that it is as performant as Hypernova, while providing post-quantum security.
Paper Link: https://eprint.iacr.org/2024/257
zkStudyClub - LatticeFold: A Lattice-based Folding Scheme and its Application...
Cy32624628
1. Khlopov Dmitry, Shvets Valeriy, Kozlovskiy Roman, Suchkov Yury, Otyuskaya_Darya /
International Journal of Engineering Research and Applications (IJERA) ISSN: 2248-9622
www.ijera.com Vol. 3, Issue 2, March -April 2013, pp.624-628
Optimal conditions for depolymerisation of oligomers of butyl
lactate in different types of reactors
Khlopov Dmitry*, Shvets Valeriy*, Kozlovskiy Roman*, Suchkov Yury*
and Otyuskaya_Darya*
*Chair of Petrochemical Synthesis, D. I. Mendeleev University of Chemical Technology of Russia, Moscow
125047, Russia
ABSTRACT
The process of producing L-Lactide from we used butyl ester of lactic acid-butyl lactate as a
butyl lactate consists of two stages. In present raw material for L-lactate. Using esters of lactic acid
work optimal conditions for the second stage- instead of lactic acid prolongs the duration of the
depolymerisation of oligomers of butyl lactate whole process of production of L-lactide, but the
were found. Depolymerisation experiments were stage of its purification, which is of extreme
performed in three types of reactors, the importance, simplifies greatly[3-7].
influence of temperature and residual pressure In our previous study the general approach for
on the yield of by-product - meso-lactide and on obtaining L-lactide was formulated and the catalyst
productivity of reactor was determined. was chosen [8]. The aim of this work was to find
According to the obtained results, the best type of optimal conditions for the second stage of the whole
reactor as well as the optimal conditions for the process-depolymerisation of oligomers of butyl
depolymerisation stage was chosen. lactate. Depolymerisation experiments were
Keywords - Batch reactor, Depolymerisation, performed in three types of reactors, the influence of
Lactide, Optimal conditions, Rotary film evaporator. temperature and residual pressure on the yield of by-
product - meso-lactide and on productivity of reactor
I. INTRODUCTION was determined. According to the obtained results,
In recent years, the problem of the best type of reactor as well as the optimal
environmental contamination has become conditions for the depolymerisation stage was
increasingly acute. Non-degradable petro-derived chosen.
materials are produced worldwide on a large scale,
introduced to the ecosystem and, being resistant to II. EXPERIMENTAL PART
microbial attack, accumulated there as industrial 2.1. Materials
waste. One of the possible solutions to this problem L-n-Butyl lactate was purchased from Alfa
could be the development of methods of obtaining Aesar. According to the manufacturer, it contained
and industrial production of biodegradable polymers. of 97% of n-Butyl L-lactate and 3% of butanol.
Monomers for such materials are generally derived Catalyst tin chloride (IV) was also obtained from
from renewable resources such as corn, potatoes and Alfa Aesar.
etc. Considering possible depletion of world oil and
coal resources, development of methods of 2.2. Oligomerisation
producing biodegradable polymers looks even more Oligomer of butyl lactate was obtained in
attractive. batch reactor with continuous removal of butanol
One of the most promising and accessible vapors and under gradual increase of temperature
biodegradable polymer is PLA (polylactic acid). from 180 oС to 200 oС and under constant barbotage
PLA has such properties as good mechanical of N2 through reaction mass. Concentration of
strength, thermal stability, transparency and after catalyst in all experiments was 2.5 × 10-3 g-atom per
being used it can be easily degraded by kg of initial ester-butyl lactate. Average molecular
microorganisms in environment to carbon dioxide mass of obtained oligomers was determined by GPC.
and water. All these facts make PLA a good
substitution to petroleum-based materials in the 2.3. Depolymerisation
spheres of packaging, agriculture and medicine [1]. 2.3.1. Batch reactor
PLA is generally produced by ring-opening Obtained oligomers (with average
polymerization of cyclic dimer of lactic acid-lactide molecular mass 820-1000 g/mol) with catalyst
[2]. The process of L-lactide production consists of remained after oligomerisation stage was placed into
several stages: oligomerisation of lactic acid or its reactor with surface area of 0,025 m2. Temperature
derivatives, depolymerization of obtained oligomer was controlled with the help of electric range and
and further purification of L-lactide. In present work thermometer. Process was carried out under vacuum
5 mm Hg. Lactide vapours from reaction zone were
624 | P a g e
2. Khlopov Dmitry, Shvets Valeriy, Kozlovskiy Roman, Suchkov Yury, Otyuskaya_Darya /
International Journal of Engineering Research and Applications (IJERA) ISSN: 2248-9622
www.ijera.com Vol. 3, Issue 2, March -April 2013, pp.624-628
condensed in condenser and collected in receiver. at 200 oC and the detector temperature was held at
Concentration of lactide was measured by GLC. 210 oC.
Gel permeation chromatography (GPC) was carried
2.3.2. Periodic process in rotary film evaporator out on liquid chromatography equipped with
Obtained oligomers (MW = 820) containing differential refractometer, binary pump, injector with
catalyst in the reaction mass after oligomerisation a loop volume 50 mL and columns placed in an air
stage were charged in round-bottom flask, which thermostat. Columns Shodex 802.5 and Shodex 804
was connected to rotor-film evaporator. Flask was were calibrated by polystyrene standards.
placed into an oil bath with oil temperature 220oC Chloroform was used as an eluent. Gauge
and process was carried out under vacuum 1-3 mm dependence was approximated by polynomial of the
Hg and constant rotating at a speed of 60 RPM. The third degree in the range 800-2000.
heated surface of the flask was 0.025 m2. Formed in
the film, lactide vapors left reaction zone of flask, III. RESULTS AND DISCUSSIONS
condensed in condenser and were collected in In this study choice of optimal conditions
receiver. Process was carried out till the completion and reactor was based on three main parameters of
of lactide formation in flask reactor. the process- the yield of L-lactide and by-product -
meso-lactide, productivity of reactor, which were
2.3.3. Continuous process in rotary film defined by Eqs (1)-(3):
evaporator
Obtained oligomers (MW = 820) containing WL = mL*100/mtheor (1)
catalyst in the reaction mass after oligomerisation
stage were charged into the heated dropping funnel. where WL- percentage yield of lactide, mL-actual
Dropping funnel was equipped with jacket filled mass of lactide, mtheor-theoretical mass of lactide;
with oil with temperature 120 oC. Then oligomer mtheor = mol * n/2 * ММL) / ММol (2)
went to the film reactor where the film on the walls where mol-mass of oligomer taken for reaction,
of reactor was created with the help of roller mixer ММL-molecular mass of lactide, ММol-molecular
rotating at a speed of 400 RPM. Feed rate of mass of oligomer, n – number of monomers in
oligomer was controlled by valve. Process was oligomer chain;
carried out under vacuum 20 mm Hg. Resulting
lactide evaporated from the film, condensed in the G = mL /τ*S (3)
condenser and was collected in the receiver.
Unreacted oligomer left in film melted and was where G-productivity, τ -time of experiment , s, S-
collected in another receiver. heated surface, m2.
2.4. Measurements 3.1. Temperature
Concentrations of all components were Influence of temperature on the main
measured by GLC. “Kristall-2000m” chromatograph parameters of the process was tested for three types
was used, which was equipped with flame ionization of reactors. Range of temperatures from 210 oC to
detector. The capillary column was 0.25 mm OD × 230 oC was examined. Residual pressure was 5 mm
50 m long with liquid phase SE-54. Nitrogen was Hg for batch reactor and periodic rotary film
used as the carrier gas 2 mL/min. The columns evaporator and 20 mm Hg for continuous rotary film
temperature was held constant at 80 oC for 1 min, evaporator. The results of experiments are listed in
ramped at 20 oC /min to 200 oC, and held at 200 oC Fig.1-2.
for 5 min. The injector temperature was maintained
625 | P a g e
3. Khlopov Dmitry, Shvets Valeriy, Kozlovskiy Roman, Suchkov Yury, Otyuskaya_Darya /
International Journal of Engineering Research and Applications (IJERA) ISSN: 2248-9622
www.ijera.com Vol. 3, Issue 2, March -April 2013, pp.624-628
1600
Productivity of reactor, g/h*m2
1400
1200
1000
800
600
Periodic rotary film
400 evaporator
200 Batch reactor
0
210 215 220 225 230
Temperature, °C
Fig.1. Productivity of reactor as a function of temperature.
16
Yield of meso-lactide, % mass
14
Periodic rotary film
12 evaporator
10 Batch reactor
8
6
4
2
0
210 215 220 225 230
Temperature, °C
Fig.2. Yield of meso-lactide at different temperatures for three types of reactors.
According to the obtained results, optimal reactor is much higher due to the fast rate of rotation
temperatures for every type of reactor are and as oligomer is distributed on the surface as a
correspondently: 220 oC for periodic rotary film film the process of removal of product from reaction
evaporator, 225-for batch reactor and 230-for zone simplifies greatly. Moreover the highest yields
continuous film evaporator. Best yield of L-lactide of by-product were also obtained in batch reactor.
was obtained at periodic rotary film evaporator. It`s 3.2. Residual pressure.
clear from the data that under the same residual Process was carried out according to described
pressure, productivity of batch reactor is lower than procedures (2.3.1.-2.3.3.) at optimal temperatures
the one of rotary film evaporator. Such advantage of chosen for every type of reactor and under different
rotary film evaporator could be explained by the fact residual pressure.
that the real heated surface in this type of Results of experiments are presented in Fig.3-4.
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4. Khlopov Dmitry, Shvets Valeriy, Kozlovskiy Roman, Suchkov Yury, Otyuskaya_Darya /
International Journal of Engineering Research and Applications (IJERA) ISSN: 2248-9622
www.ijera.com Vol. 3, Issue 2, March -April 2013, pp.624-628
2000
1800 Periodic rotary film evaporator
1600 Batch reactor
Productivity, g/h*m2
1400
Continuous film evaporator
1200
1000
800
600
400
200
0
5 8 10 15 20 25
Residual pressure, mm Hg
Fig.3. Productivity of reactor as a function of residual pressure.
12
Periodic rotary film evaporator
Batch reactor
10
Yield of meso-lactide, %mass
Continuous rotary film evapotaror
8
6
4
2
0
5 8 10 15 20 25
Residual pressure, mm Hg
Fig.4. Yield of meso-lactide at different temperatures for three types of reactors.
Fig.3 shows the changes in productivity under 230oC under residual pressure 5mm Hg.
different residual pressure. This data clearly The worst results were shown by batch reactor.
indicates that the best productivity is obtained in
continuous rotary film evaporator at temperature REFERENCES
230 under residual pressure 5 mm Hg. [1] Shoemaker, S. Advannced Biocatalytic
Processing of Heterogeneous Lignocellulosic
IV. CONCLUSIONS Feedstocks to a Platform Chemical
In present work, three different types of Intermediate (Lactic acid Ester). University of
reactors for depolymerisation of oligomers of butyl California, 2004; pp 67.
lactate were tested. Optimal conditions of the [2] K. Madhavan Nampoothiri, Nimisha
process were found for each type of reactor. Rajendran Nair, Rojan Pappy John, An
According to the obtained results, the best type of overview of the recent developments in
reactor was found to be continuous rotary film polylactide (PLA) research, Bioresour.
evaporator. It showed the highest productivity at Technol.101 (2010) 8493-8501.
627 | P a g e
5. Khlopov Dmitry, Shvets Valeriy, Kozlovskiy Roman, Suchkov Yury, Otyuskaya_Darya /
International Journal of Engineering Research and Applications (IJERA) ISSN: 2248-9622
www.ijera.com Vol. 3, Issue 2, March -April 2013, pp.624-628
[3] Patrick, G.; Stanley, H. E.; Jeffrey, K.;
Matthew, I.; Richard, B.; Ronald, B.
Continuous Process for the Manufacture of
Lactide and Lactide Polymers. US 6326458,
2001.
[4] Hitomi, O.; Masahiro, I.; Seji, S.; Jidosha, T.;
Kaisha, K. Process for Producing Lactide and
Process for Producing Polylactic Acid from
Fermented Lactic Acid Employed as Starting
Material. US 6569989, 2002.
[5] Hideji, K.; Yasushi, H.; Masahiro, K.
Production of Lactide. JP 10036366, 1998.
[6] Philippe, C.; Jean-Christophe, B.; Frederic, V.
G. Method for the Production of Polylactide
from a Solution of Lactic Acid or one of the
Derivatives Thereof. US 7488783, 2006.
[7] Kamlesh, B.; Kang, L.; Robert, N.; Thomas,
S. Thin Film Depolymerization to Dimeric
Cyclic Esters. WO 9302075, 1993.
[8] Khlopov D., Shvets V., Kozlovskiy R.,
Suchkov Y., Otyuskaya D., Synthesis of L-
Lactide from Butyl Lactate: Selection of
Catalyst, J.Chem.Chem.Eng. 6 (2012).
628 | P a g e