Hydrochemistry Of High-Mountain Pamir Rivers: Formation, Changes And Influence On The Chemical Composition Of Irrigation Water,
2022
Institute of Mathematics of the National Academy of Sciences of the Republic of Tajikistan, 734042, Dushanbe, Tajikistan
Hydrochemistry Of High-Mountain Pamir Rivers: Formation, Changes And Influence On The Chemical Composition Of Irrigation Water, Parviz Inomovich Normatov, Inom Normatov, Akobir Karimzoda, Rano Eshankulova, Ayubdzon Normatov, Nurmakhmad Shermatov
Journal of Environmental Science and Sustainable Development
The purpose of the research is to analyze the prospects for the agriculture development in the Central Asian region and Tajikistan in particular, in terms of identifying the main favorable and constraining factors for the further agriculture development. The Pyanj river is one of the main tributaries of the Transboundary Amu Darya River in the Central Asian region, whose waters are a source of drinking water supply for the population and 80% used for irrigation of agricultural land. The trend of deteriorating water quality of Central Asian River systems recently has been increasing, and monitoring water quality from the formation …
High-Performance Catalytic Four-Channel Hollow Fibers With Highly Dispersed Nickel Nanoparticles Prepared By Atomic Layer Deposition For Dry Reforming Of Methane,
2022
Missouri University of Science and Technology
High-Performance Catalytic Four-Channel Hollow Fibers With Highly Dispersed Nickel Nanoparticles Prepared By Atomic Layer Deposition For Dry Reforming Of Methane, Baitang Jin, Shiguang Li, Xinhua Liang
Chemical and Biochemical Engineering Faculty Research & Creative Works
Highly dispersed nickel (Ni) nanoparticles (NPs) with an average particle size of 4.3 nm were uniformly deposited on the outer surface, the inner channel surface, and inside the pores of 20 cm long four-channel α-Al2O3hollow fibers (HFs) by atomic layer deposition (ALD) for dry reforming of methane (DRM). Cerium oxide (CeO2) was added to promote the catalytic performance of Ni/Al2O3-HF catalysts. Rationally designed filling methods, by tuning the reactor size and inert fillings, can reduce the catalyst bed voidage in a fixed bed reactor for better reactant gas distribution, effectively …
Electric Field Driven Co-Assembly And Transport Of Colloids Using Active-Passive Interaction,
2022
Louisiana State University and Agricultural and Mechanical College
Electric Field Driven Co-Assembly And Transport Of Colloids Using Active-Passive Interaction, Brishty Deb Choudhury
LSU Master's Theses
Over the past few decades, the out-of-equilibrium transport and assembly of colloidal particles have been drawing significant interest due to their myriad applications in biology, engineering, and physics. In the absence of any external force, micro and nanoparticles perform Brownian motion in dispersion and are termed as passive colloids. In contrast, active colloids are a class of particles where a net imbalance of fluid flow around their surface drives their net migration in space when subjected to an external electric field. While several studies have shown the ability to program the dynamics of active colloids using an external electric field, …
Obtaining Wrapping Paper Used In Furniture Wrapping And Quality Delivery And Determining Its Quality Indicators,
2022
Tashkent State Technical University named after Islam Karimov
Obtaining Wrapping Paper Used In Furniture Wrapping And Quality Delivery And Determining Its Quality Indicators, E A. Egamberdiyev, A R. Makhkamov, G R. Rakhmonberdiev
Technical science and innovation
Composite materials samples have been obtained from cellulose and bazalt fibers based on cellulose-containing plants. The properties of paper samples have been studied: the amound of cellulose, the amound of ash, water absorption and breaking load. Gained results show that the composite material with the addition of basalt fibers is more durable. Half-finished cellulose fibers obtained from basalt, straw and wastepaper are more prouse than ones obtained from cotton plant
Aryl Sulfonic Acid Catalysts: Effect Of Pendant Group Structure On Activity In Hydrolysis Of Polyethylene Terephthalate,
2022
Missouri University of Science and Technology
Aryl Sulfonic Acid Catalysts: Effect Of Pendant Group Structure On Activity In Hydrolysis Of Polyethylene Terephthalate, Hossein Abedsoltan, Maria R. Coleman
Chemical and Biochemical Engineering Faculty Research & Creative Works
A series of aryl sulfonic acids were tested as catalysts for acid hydrolysis occurring at the surface of poly(ethylene) terephthalate (PET) particles. Specifically, p-toluene sulfonic acid monohydrate (PTSA), 2-naphthalenesulfonic acid (2-NSA), and 1,5-naphthalenedisulfonic acid tetrahydrate (1,5-NDSA) were chosen to provide sulfonic acid active groups and varying hydrophobic functionality. The effect of catalyst concentration and reaction temperature on PET hydrolysis rate was studied. The aryl sulfonic acid catalysts exhibited much higher rates of PET hydrolysis than the mineral acid, H2SO4. At 150°C and 4 M catalyst, the time required to achieve more than 90% TPA yield was …
Impact Of Ultrathin Coating Layer On Lithium-Ion Intercalation Into Particles For Lithium-Ion Batteries,
2022
Missouri University of Science and Technology
Impact Of Ultrathin Coating Layer On Lithium-Ion Intercalation Into Particles For Lithium-Ion Batteries, Yufang He, Hiep Pham, Xinhua Liang, Jonghyun Park
Chemical and Biochemical Engineering Faculty Research & Creative Works
Ultrathin film coatings on battery materials via atomic layer deposition (ALD) have been demonstrated as an efficient technology for battery performance enhancement. However, the fundamental understanding on lithium intercalation into active materials through the interface between the coating and active materials is unclear, which makes it difficult to optimize ALD coating strategies. Further, like most active materials, a coating layer can undergo volume change during the intercalation process, which can produce detrimental structural changes and mechanical failure of the layer. In this work, first-principles calculations are conducted to reveal the behavior of a coating layer on an active material particle …
Study Thermodynamics Of The Magnetite Sulfidation In Copper Smelting Processes,
2022
Almalyk Mining and Metallurgical Combine
Study Thermodynamics Of The Magnetite Sulfidation In Copper Smelting Processes, A S. Khasanov, Q T. Ochildiyev, B T. Berdiyarov, Sh T. Khojiev, S T. Matkarimov
Technical science and innovation
The article discusses the problem of reducing the amount of magnetite in the impregnation of copper in the slag generated after the conversion process in copper production in the furnace to reduce slag. Accordingly, a method of lowering magnetite by sulfidation has been proposed, using elemental sulfur as a local and relatively inexpensive sulfiding-reducing agent. The mechanism of chemical phenomena occurring in the interaction regions of magnetite and elemental sulfur has been developed. Based on the mechanism of chemical reactions produced, each chemical reaction that occurs in the process is analysed from a thermodynamic point of view. According to the …
Increase The Nutritional Value Of Pasta With Grains And Pulses,
2022
Tashkent State Technical University named after Islam Karimov
Increase The Nutritional Value Of Pasta With Grains And Pulses, D D. Mirkhodjaeva, E Sh Sanaev
Technical science and innovation
The main goal of this study is to develop a paste formulation containing a mixture of ginger, lemon and mint powder, as well as a combination of legumes and cereals with high nutritional value. This will expand the range of pasta. The task of achieving high quality and economic efficiency is solved by improving a number of technological processes and applying innovative methods. The effectiveness of using innovative methods of freeze-drying and microwave drying is shown in comparison with the process of drying instant pasta by frying them in vegetable oil.
Recovery Of The Recovery Zinc Concentrate In A Weakly Reducing Gas Atmospheric Environment,
2022
Tashkent State Technical University named after Islam Karimov
Recovery Of The Recovery Zinc Concentrate In A Weakly Reducing Gas Atmospheric Environment, B T. Berdiyarov, S T. Matkarimov, J B. Ismailov
Technical science and innovation
This article provides information on the formation of substances resulting from the roasting of sulfide-zinc concentrates, which negatively affects the course of subsequent stages. The resulting calcine was sent for reduction roasting in a weakly reducing inert gas atmosphere. Based on this, it can be assumed that the impact on the calcine of "weak" energetic inert gases the reduce minimises or formation of ferrites and zinc silicates. Since the principal primary using agent is gaseous H2, (hydrogen) in a mixture of gases with a weak reducing environment, all redox reactions occurring in total reduction were studied. The course …
An Acoustofluidic Scanning Nanoscope Using Enhanced Image Stacking And Processing,
2022
Duke University
An Acoustofluidic Scanning Nanoscope Using Enhanced Image Stacking And Processing, Geonsoo Jin, Joseph Rich, Jianping Xia, Albert J. He, Chenglong Zhao, Tony Jun Huang
Faculty Publications
Nanoscale optical resolution with a large field of view is a critical feature for many research and industry areas, such as semiconductor fabrication, biomedical imaging, and nanoscale material identification. Several scanning microscopes have been developed to resolve the inverse relationship between the resolution and field of view; however, those scanning microscopes still rely upon fluorescence labeling and complex optical systems. To overcome these limitations, we developed a dual-camera acoustofluidic nanoscope with a seamless image merging algorithm (alpha-blending process). This design allows us to precisely image both the sample and the microspheres simultaneously and accurately track the particle path and location. …
Bioremediation Of Petroleum-Based Contaminants By Alkane-Degrading Bacterium Alcanivorax Borkumensis,
2022
Louisiana State University and Agricultural and Mechanical College
Bioremediation Of Petroleum-Based Contaminants By Alkane-Degrading Bacterium Alcanivorax Borkumensis, Amber Julaine Pete
LSU Doctoral Dissertations
The world’s dependence on petroleum hydrocarbons has led to significant environmental implications. For example, oil spills cause lasting environmental damage, and the increase of plastics in the marine environment has been growing, specifically, microplastics that can be difficult to detect due to their small size. Petroleum hydrocarbons occur naturally in nearly all marine environments, which has allowed hundreds of microorganisms to evolve to utilize these hydrocarbons as their primary energy source. These microbes are classified as hydrocarbonoclastic and are utilized to remove spilled oil biodegradation. Over the last ten years, progress has been made in the biodegradation of oil spills …
Control Implemented On Quantum Computers: Effects Of Noise, Nondeterminism, And Entanglement,
2022
Department of Chemical Engineering and Materials Science, Wayne State University, Detroit, MI
Control Implemented On Quantum Computers: Effects Of Noise, Nondeterminism, And Entanglement, Kip Nieman, Keshav Kasturi Rangan, Helen Durand
Chemical Engineering and Materials Science Faculty Research Publications
Quantum computing has advanced in recent years to the point that there are now some quantum computers and quantum simulators available to the public for use. In addition, quantum computing is beginning to receive attention within the process systems engineering community for directions such as machine learning and optimization. A logical next step for its evaluation within process systems engineering is for control, specifically for computing control actions to be applied to process systems. In this work, we provide some initial studies regarding the implementation of control on quantum computers, including the implementation of a single-input/single-output proportional control law on …
Analysis Of Sequential Adsorption-Oxidation Of Vocs On Atomic Layer-Deposited Ptni/Zro2-Sio2dual-Function Materials,
2022
Missouri University of Science and Technology
Analysis Of Sequential Adsorption-Oxidation Of Vocs On Atomic Layer-Deposited Ptni/Zro2-Sio2dual-Function Materials, Busuyi O. Adebayo, Han Yu, Ali A. Rownaghi, Xinhua Liang, Fateme Rezaei
Chemical and Biochemical Engineering Faculty Research & Creative Works
To develop efficient dual-function materials (DFMs) for capture and destruction of volatile organic compounds (VOCs), we prepared a series of composite materials comprising PtNi nanoparticles supported on ZrO2-promoted SiO2(PtNi/ZrO2-SiO2) via atomic layer deposition (ALD) method and investigated them for sequential adsorption and desorption/catalytic oxidation of benzene, as a model VOC compound. ZrO2was first deposited on a unimodal SiO2support, followed by deposition of Pt and Ni nanoparticles with varried amount. Dynamic adsorption experiments were conducted using a 500 ppmv-laden feed at 25 °C and 1 atm, followed by in …
Scale Up Of A Novel Method To Maximize Malonyl-Coa In Escherichia Coli,
2022
Louisiana State University and Agricultural and Mechanical College
Scale Up Of A Novel Method To Maximize Malonyl-Coa In Escherichia Coli, Clifford Harris Leblanc Iv
LSU Master's Theses
The instability of oil’s price along with its limited availability and impact on the environment motivate the search for an alternative feedstock that can sustain the profitability of chemical companies. Industrial biotechnology can promote renewable sources of energy and products by using microorganisms to produce a wide range of chemical compounds. The three-carbon metabolite, malonyl-CoA, can serve as a precursor to a variety of industrial chemicals. The major hurdle with using malonyl-CoA in industry is that its intracellular concentration in Escherichia Coli is very low. Previous attempts to increase the intracellular level of malonyl-CoA have ranged from genetic engineering of …
Microkinetic Modeling Of Acetone Hydrogenation Over Different Metal Surfaces With And Without Lateral Interactions In Julia,
2022
Syracuse University
Microkinetic Modeling Of Acetone Hydrogenation Over Different Metal Surfaces With And Without Lateral Interactions In Julia, Emir Hadzic
Theses - ALL
Biomass conversion into near net zero carbon emission fuels as well as intermediates for other products is just one of the technologies that will help reduce the use of fossil fuels. When biomass is being converted to useful products the intermediate steps are often oxygen rich with carbonyl groups. These are further processed using metal catalysts such as platinum and ruthenium. Microkinetic modeling allows for these catalysts to be studied under various operating conditions. Previously hydrogenation of acetone over platinum and ruthenium was studied using algebraic models without lateral interactions with step 3 and 4 being rate determining for Pt …
New Solid Polymer Electrolytes For Lithium, Sodium, And Calcium-Based Batteries,
2022
Syracuse University
New Solid Polymer Electrolytes For Lithium, Sodium, And Calcium-Based Batteries, Francielli Silva Genier
Dissertations - ALL
The establishment of sustainable energy sources highly depends on efficient storage devices to guarantee a consistent power supply. The growing demand for lithium-ion batteries (LIBs) for this purpose, combined with concerns about lithium availability, has motivated the search for viable storage alternatives, such as sodium and calcium. While several studies have investigated different lithium-free liquid electrolytes, the transport of these alternative ions in their polymer counterparts remains understudied. The advantages of solid polymer electrolytes include the possibility of higher energy density in solid-state devices and the elimination of safety concerns associated with liquid electrolytes, such as flammability, leakage, and dendrite …
Metastable Olivine Within Oceanic Lithosphere In The Uppermost Lower Mantle Beneath The Eastern United States,
2022
Missouri University of Science and Technology
Metastable Olivine Within Oceanic Lithosphere In The Uppermost Lower Mantle Beneath The Eastern United States, Fansheng Kong, Stephen S. Gao, Kelly H. Liu, Yinxia Fang, Hejun Zhu, Robert J. Stern, Jiabiao Li
Geosciences and Geological and Petroleum Engineering Faculty Research & Creative Works
Approximately two-thirds of Earth's outermost shell is composed of oceanic plates that form at spreading ridges and recycle back to Earth's interior in subduction zones. A series of physical and chemical changes occur in the subducting lithospheric slab as the temperature and pressure increase with depth. In particular, olivine, the most abundant mineral in the upper mantle, progressively transforms to its high-pressure polymorphs near the mantle transition zone, which is bounded by the 410 km and 660 km discontinuities. However, whether olivine still exists in the core of slabs once they penetrate the 660 km discontinuity remains debated. Based on …
Experimentation And Correlation Development Of Mass Transfer In A Mimicked Fischer–Tropsch Slurry Bubble Column Reactor,
2022
Missouri University of Science and Technology
Experimentation And Correlation Development Of Mass Transfer In A Mimicked Fischer–Tropsch Slurry Bubble Column Reactor, Lu Han, Mahmoud M. Taha, Premkumar Kamalanathan, Nora Y. Selem, Muthanna H. Al-Dahhan
Chemical and Biochemical Engineering Faculty Research & Creative Works
Gas–liquid volumetric mass transfer coefficient "kLa " for CH4, CO2, and Ar were experimentally measured at different conditions in a mimicked Fischer–Tropsch (FT) slurry bubble column reactor by using a non-invasive gaseous tracer technique and the axial dispersion model. Results validate the square root relation, between kLa and diffusivity "Dg", that can be used to predict kLa for different species with k La values available in the literature. Additionally, Higbie's penetration theory was adopted along with bubble dynamics parameters estimation to develop a correlation for predicting kL …
Molecular Theoretical Model For Lipid Bilayers: Adsorption Of Lipidated Proteins On Lipid Bilayers As A Function Of Bilayer Composition And Curvature,
2022
University of South Carolina
Molecular Theoretical Model For Lipid Bilayers: Adsorption Of Lipidated Proteins On Lipid Bilayers As A Function Of Bilayer Composition And Curvature, Shauna Celeste Kennard
Theses and Dissertations
Protein localization on biological membranes is motivated by either highly selective recognition of specific target membrane components or nonspecific attraction to general physical properties of the membrane, such as charge, lipid heterogeneity, and curvature. Here we discuss the interaction between lipidated proteins and lipid bilayer membranes from a comprehensive examination of how features of the membrane and its lipid constituents, including lipid composition, headgroup size, degree of tail saturation, tail length (bilayer thickness), and membrane geometry, affect the adsorption ability of the proteins. Of key importance is the strong interconnection among these compositional and morphological elements of the membrane in …
Understanding The Reaction Kinetics Of Polyurethane Flexible Foam,
2022
Florida Institute of Technology
Understanding The Reaction Kinetics Of Polyurethane Flexible Foam, Caitlin Alma Mckinnon
Theses and Dissertations
Polyurethane flexible foam is used throughout daily life predominantly as cushions for chairs and mattresses. Currently new foams are made through extensive research and development via trial and error. There are many reactions interacting with each other during the polyurethane generation process. The numerous reactions create difficulty in modeling and predicting the physical attributes of a foam. This thesis explores the kinetics associated with each reaction to generate a simple model to understand the reaction kinetics with the addition of some additives. This thesis focused on creating the foams in a real-world environment, including allowing ambient water vapor to be …
