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12,436 full-text articles. Page 4 of 361.

Enhancing The Conductivity Of Cell-Laden Alginate Microfibers With Aqueous Graphene For Neural Applications, Marilyn C. McNamara, Amir Ehsan Niaraki-Asli, Jingshuai Guo, Jasmin Okuzono, Reza Montazami, Nicole N. Hashemi 2020 Iowa State University

Enhancing The Conductivity Of Cell-Laden Alginate Microfibers With Aqueous Graphene For Neural Applications, Marilyn C. Mcnamara, Amir Ehsan Niaraki-Asli, Jingshuai Guo, Jasmin Okuzono, Reza Montazami, Nicole N. Hashemi

Mechanical Engineering Publications

Microfluidically manufacturing graphene-alginate microfibers create possibilities for encapsulating rat neural cells within conductive 3D tissue scaffolding to enable the creation of real-time 3D sensing arrays with high physiological relavancy. Cells are encapsulated using the biopolymer alginate, which is combined with graphene to create a cell-containing hydrogel with increased electrical conductivity. Resulting novel alginate-graphene microfibers showed a 2.5-fold increase over pure alginate microfibers, but did not show significant differences in size and porosity. Cells encapsulated within the microfibers survive for up to 8 days, and maintain ~20% live cells over that duration. The biocompatible aqueous graphene suspension used in this ...


Hybrid Monomers & Resins For High-Performance Thermosetting Polymers, Thermoplastics, & Additive Manufacturing, Alexander William Bassett 2020 Rowan University

Hybrid Monomers & Resins For High-Performance Thermosetting Polymers, Thermoplastics, & Additive Manufacturing, Alexander William Bassett

Theses and Dissertations

Vinyl ester and epoxy resins are used to produce thermosetting polymeric materials for a variety of commercial and military applications due to their relatively high moduli (2-3 GPa at 25 deg C), glass transition temperatures (Tgs) (greater than or equal to 120 deg C), and adequate fracture toughness (G1C approx. 200-250 J m-2). Most commercially available vinyl ester and epoxy resins are typically cured via traditional manufacturing techniques such as resin transfer molding and thermal curing. However, additive manufacturing (AM) has gained significant traction as a favorable manufacturing technique over traditional methods due to the ability to create customizable parts ...


Re-Crosslinking Particle Gel For Co₂ Conformance Control And Co₂ Leakage Blocking, Yifu Long, Baojun Bai, Thomas P. Schuman 2020 Missouri University of Science and Technology

Re-Crosslinking Particle Gel For Co₂ Conformance Control And Co₂ Leakage Blocking, Yifu Long, Baojun Bai, Thomas P. Schuman

Geosciences and Geological and Petroleum Engineering Faculty Research & Creative Works

The present invention generally relates to the composition of particle gels for CO2-EOR and CO2 storage. More particularly, CO2 resistant particle gels are provided that can re-crosslink at subterranean conditions. These particle gels can be deployed to improve the conformance of CO2 flooding, CO2 huff-puff, or Water-Alternative-Gas (WAG). The applications may also involve CO2 storage, such as the blocking of CO2 leakage and similar CO2 processing.


High-Throughput Synthesis And Screening Of Rapidly-Degrading Polyanhydride Nanoparticles, Adam S. Mullis, Sarah J. Jacobson, Balaji Narasimhan 2020 Iowa State University

High-Throughput Synthesis And Screening Of Rapidly-Degrading Polyanhydride Nanoparticles, Adam S. Mullis, Sarah J. Jacobson, Balaji Narasimhan

Chemical and Biological Engineering Publications

Combinatorial techniques can accelerate the discovery and development of polymeric nanodelivery devices by pairing high-throughput synthesis with rapid materials characterization. Biodegradable polyanhydrides demonstrate tunable release, high cellular internalization, and dose sparing properties when used as nanodelivery devices. This nanoparticle platform shows promising potential for small molecule drug delivery, but the pace of understanding and rational design of these nanomedicines is limited by the low throughput of conventional characterization. This study reports the use of a high-throughput method to synthesize libraries of a newly synthesized, rapidly-eroding polyanhydride copolymer based on 1,8-bis(p-carboxyphenoxy)-3,6-dioxaoctane (CPTEG) and sebacic acid (SA) monomers ...


Integrity Testing Of Gas Permeable Silicone Filters, Maggie M. Baker, Thomas P. Humann, Kevin J. Yerina 2020 California Polytechnic State University, San Luis Obispo

Integrity Testing Of Gas Permeable Silicone Filters, Maggie M. Baker, Thomas P. Humann, Kevin J. Yerina

Biomedical Engineering

This report investigates the most reasonable, cost efficient, and reliable ways to integrity test a filter made from a permeable silicone membrane for future biomedical and pharmaceutical applications. The goal of the project was to create a fixture that a pharmaceutical company can use to quickly and reliably test the integrity of the filter. A variety of methods are outlined to test the integrity of the filter, after a series of quantitative tests, a single method was established that meet the requirements most thoroughly. The method that was determined to be most effective involves a series of components including a ...


A Simplified Method For Experimentally Quantifying Crude Oil Swelling During Immiscible Carbon Dioxide Injection, Sherif Fakher, Abdulmohsin Imqam 2020 Missouri University of Science and Technology

A Simplified Method For Experimentally Quantifying Crude Oil Swelling During Immiscible Carbon Dioxide Injection, Sherif Fakher, Abdulmohsin Imqam

Geosciences and Geological and Petroleum Engineering Faculty Research & Creative Works

Immiscible carbon dioxide (CO2) injection is one of the highly applied enhanced oil recovery (EOR) methods due to its high oil recovery potential and its ability to store CO2 in the reservoir. The main mechanism of immiscible CO2 injection is oil swelling. Generally, oil swelling is measured experimentally or measured using modeling methods. This research conducts oil swelling experiments using a simplified method in order to easily and accurately measure oil swelling and determines some of the most significant factors that may impact oil swelling during CO2 injection. The impact of varying CO2 injection pressure ...


Insights Into The Applications Of Waste Materials In The Oil And Gas Industry: State Of The Art Review, Availability, Cost Analysis, And Classification, Abo Taleb T. Al-Hameedi, Husam H. Alkinani, Hussein W. Albazzaz, Shari Dunn-Norman, Mohammed M. Alkhamis 2020 Missouri University of Science and Technology

Insights Into The Applications Of Waste Materials In The Oil And Gas Industry: State Of The Art Review, Availability, Cost Analysis, And Classification, Abo Taleb T. Al-Hameedi, Husam H. Alkinani, Hussein W. Albazzaz, Shari Dunn-Norman, Mohammed M. Alkhamis

Geosciences and Geological and Petroleum Engineering Faculty Research & Creative Works

This study investigates different types of waste materials and their applicability in the oil and gas industry as well as analyzing various applications of these waste materials in the petroleum industry. This study also explores the availability of these waste materials by performing a statistical analysis in a good number of countries worldwide. The statistical study was performed starting with a study on which countries generate waste the most overall, followed by examining multiple countries and investigating their top three most available waste. The results showed that the USA is the leading country in terms of municipal solid waste generation ...


Precise Measuring Cells For Quantitative And Qualitative Measurement, A.A. Begunov, B.M. Akhmedov, R.A. Ibragimov 2020 Doctor of Technical Sciences, Professor, Department of Automation and Automation of Production Processes, St. Petersburg Institute of Management and Food Technologies, Address: nab. Griboedov Canal, 7, 191186, St. Petersburg, Russia,

Precise Measuring Cells For Quantitative And Qualitative Measurement, A.A. Begunov, B.M. Akhmedov, R.A. Ibragimov

Chemical Technology, Control and Management

The main provisions considered in assessing the accuracy of methods and measurement results are considered. It is shown that in the experimental assessment of various accuracy indicators, and also when analyzing the content of components in various gaseous media, the sorption-gravimetric measurement method is widely used, methods for measuring the mass of the sorbent and possible sources of error of this technique. Methods of measuring the mass of gas using specific surface areas, including taking into account the contact of gas with a solid material, and also, the amount of adsorbed gas and its pressure, temperature, type and size of ...


Techniques To Solve Decision-Making Problems, Dilnoz Tulkunovna Muhamediyeva, Bekmuratov Fayzievich Tulkun 2020 Scientific and Innovation Center of Information and Communication Technologies at Tashkent University of Information Technologies named after Muhammad al-Khwarizmi, Address: Amir Temurstreet, 108, 100200, Tashkent city, Republic of Uzbekistan, Phone:+998-95-195-47-52

Techniques To Solve Decision-Making Problems, Dilnoz Tulkunovna Muhamediyeva, Bekmuratov Fayzievich Tulkun

Chemical Technology, Control and Management

Solving decision-making problems in poorly formalized systems only with the help of deterministic and probabilistic methods is insufficient. To do this, it is necessary to widely apply the methods of hybrid intelligent systems and, especially, the methods of “soft” calculations (SoftCalculation, SoftComputing) and the directions of ComputationalIntelligence — intelligent computing technologies that are emerging on this theoretical and methodological base. An immune - fuzzy algorithm for the synthesis of fuzzy inference systems (FIS) is proposed. A two-stage adaptive FIS synthesis algorithm is described. At the first stage, the initial fuzzy parameters are clustered in order to reduce the number of input parameters ...


Features Of Hydration Process, Structure Formation And Curing Processes Of Mono And Polymineral Cement In The Presence Of Additives Of Solid Waste Of Soda Production, Nargis Shamadinova, Gulnora Abdukadirovna Tokhtakhunova PhD, Temur Azimovich Atakuziev, Shakhnoza Saidanvarovna Rakhimjanova 2020 Tashkent Chemical-Technogical Institute, Uzbekistan

Features Of Hydration Process, Structure Formation And Curing Processes Of Mono And Polymineral Cement In The Presence Of Additives Of Solid Waste Of Soda Production, Nargis Shamadinova, Gulnora Abdukadirovna Tokhtakhunova Phd, Temur Azimovich Atakuziev, Shakhnoza Saidanvarovna Rakhimjanova

Chemical Technology, Control and Management

The influence of the additive of solid waste of soda production (SWSP) on the content of -C2S and C3S in cement studied. It was found that SWSP affects the density of the aluminum-containing minerals C3A and C4AF, in addition, in the presence of gypsum, their plasticizing properties improved. The introduction of SWSP additives during grinding of clinker intensifies the grinding process and made it possible to obtain a more plastic cement. It was proved that SWSP with CaCl2 content can be used as an additive to concrete and cement mortars - this ...


Controlling And Forecasting The Reliability Of Integrated Circuits Of Radio Systems Transmitting Information, Abdulaziz M. Nazarov Prof, Dilmurod A. Davronbekov Prof. 2020 Tashkent State Technical University, Uzbekistan

Controlling And Forecasting The Reliability Of Integrated Circuits Of Radio Systems Transmitting Information, Abdulaziz M. Nazarov Prof, Dilmurod A. Davronbekov Prof.

Chemical Technology, Control and Management

The issues of forecasting the reliability of integrated circuits, which are the main element base of modern radio engineering information transmission systems, are considered. Methods of parametric and functional control are described to determine the correspondence of the static and dynamic parameters of microcircuits to the required values. A combined method for determining the operating parameters of microcircuits is also described. The advantage of this method in addition to the two above methods is indicated that it combines the function of controlling the operation of the entire control system. Two approaches for predicting reliability are given, as well as mathematical ...


Investigating The Solution Properties Of Population Model Of Cross-Diffusion Model With Double Nonlinearity And With Variable Density, Dildora Kabilovna Muhamediyeva 2020 Scientific and Innovation Center of Information and Communication Technologies at Tashkent University of Information Technologies named after Muhammad al-Khwarizmi, Address: Amir Temur street, 108, 100200, Tashkent city, Republic of Uzbekistan

Investigating The Solution Properties Of Population Model Of Cross-Diffusion Model With Double Nonlinearity And With Variable Density, Dildora Kabilovna Muhamediyeva

Chemical Technology, Control and Management

The models of two competing populations with double nonlinear diffusion and three types of functional dependencies are considered. The first dependence corresponds to the Malthusian type, the second to the Verhühlst type (logistic population), and the third to Olli-type populations. A common element of this kind of description is the presence of a linear source. Nonlinear sinks are also present in descriptions of populations of the Verhulst and Ollie type. Suitable initial approximations for a rapidly converging iterative process are proposed. Based on a self-similar analysis and comparison of the solutions of the Cauchy problem in the domain for an ...


Steady Algorithms For Synthesis Of Multidimensional Controlling Systems With Incomplete Information About The Object State, Uktam Farkhodovich Mamirov 2020 PhD., Department Tashkent State Technical University, Tel.: (+99890) 900-56-25

Steady Algorithms For Synthesis Of Multidimensional Controlling Systems With Incomplete Information About The Object State, Uktam Farkhodovich Mamirov

Chemical Technology, Control and Management

In this paper, questions of forming and creation of steady synthesis algorithms of multidimensional controlling systems at incomplete information on object status are considered. It is shown that the matrix of feedback coupling on a status at the complete information is not determined. The different algorithms of steady calculation of a matrix pseudo-inverse to the matrix of outputs using these or those decomposition of matrixes are analyzed. Algorithms of iterative specification of a required solution of "skeletal" decomposition are given. The given expressions allow synthesizing the simplified computing procedures of synthesis of multidimensional controlling systems at incomplete information on object ...


Neuro-Fuzzy Modeling For Predictive Control Systems With Complex Technological Processes And Production, Yusupbekov Nodirbek, Shukhrat Gulyamov, Malika Doshchanova 2020 Tashkent State Technical University named after Islam Karimov

Neuro-Fuzzy Modeling For Predictive Control Systems With Complex Technological Processes And Production, Yusupbekov Nodirbek, Shukhrat Gulyamov, Malika Doshchanova

Chemical Technology, Control and Management

The paper implements a modification of a fuzzy neural network, which is suitable for predictive control purposes. Adaptation of a multidimensional programmable controller based on a neural algorithm for the back propagation of forecasting errors is proposed, as well as neural parametric identification of a fuzzy mathematical model of complex technological processes and production based on experimental data and expert estimates.


Influence Of Conditions For Alcoholysis Of Secondary Polyethylene Terephthalate On The Output Of Bis (Hydroxyethyl) Terephthalate, ABDUVOKHIDOV Iqboljon, JURAYEV Asror, ALIMUKHAMEDOV Muzafar, MAGRUPOV Farkhad 2020 Tashkent Chemical-Technological Institute, Tashkent, Uzbekistan

Influence Of Conditions For Alcoholysis Of Secondary Polyethylene Terephthalate On The Output Of Bis (Hydroxyethyl) Terephthalate, Abduvokhidov Iqboljon, Jurayev Asror, Alimukhamedov Muzafar, Magrupov Farkhad

CHEMISTRY AND CHEMICAL ENGINEERING

The paper presents the results of a study of the process of alcoholysis of secondary polyethylene terephthalate ethylene glycol (EG). The main attention is paid to determining the optimal conditions for the formation of bis-hydroxy ethylene terephthalate, since this product is an intermediate in the production of polyethylene terephthalate. At the same time, the effects of the duration of alcoholysis, the type and amount of catalyst on the yield of bis-hydroxy ethylene terephthalate (ratio of PET: EG = 1 mol elementary link 4 mol) were studied. Changing the duration of alcoholysis from 8 to 10 hours, the type and amount of ...


Electrocoagulation: A Promising Method To Treat And Reuse Mineral Processing Wastewater With High Cod, Gaogui Jing, Shuai Ren, Yuesheng Gao, Wei Sun, Zhiyong Gao 2020 Central South University

Electrocoagulation: A Promising Method To Treat And Reuse Mineral Processing Wastewater With High Cod, Gaogui Jing, Shuai Ren, Yuesheng Gao, Wei Sun, Zhiyong Gao

Michigan Tech Publications

Mineral processing wastewater contains large amounts of reagents which can lead to severe environmental problems, such as high chemical oxygen demand (COD). Inspired by the wastewater treatment in such industries as those of textiles, food, and petrochemistry, in the present work, electrocoagulation (EC) is applied for the first time to explore its feasibility in the treatment of wastewater with an initial COD of 424.29 mg/L from a Pb/Zn sulfide mineral flotation plant and its effect on water reuse. Typical parameters, such as anode materials, current density, initial pH, and additives, were characterized to evaluate the performance of ...


A Technoeconomic Platform For Early-Stage Process Design And Cost Estimation Of Joint Fermentative‒Catalytic Bioprocessing, Mothi Bharath Viswanathan, D. Raj Raman, Kurt A. Rosentrater, Brent H. Shanks 2020 Iowa State University

A Technoeconomic Platform For Early-Stage Process Design And Cost Estimation Of Joint Fermentative‒Catalytic Bioprocessing, Mothi Bharath Viswanathan, D. Raj Raman, Kurt A. Rosentrater, Brent H. Shanks

Chemical and Biological Engineering Publications

Technoeconomic analyses using established tools such as SuperPro Designer® require a level of detail that is typically unavailable at the early stage of process evaluation. To facilitate this, members of our group previously created a spreadsheet-based process modeling and technoeconomic platform explicitly aimed at joint fermentative‒catalytic biorefinery processes. In this work, we detail the reorganization and expansion of this model—ESTEA2 (Early State Technoeconomic Analysis, version 2), including detailed design and cost calculations for new unit operations. Furthermore, we describe ESTEA2 validation using ethanol and sorbic acid process. The results were compared with estimates from the literature, SuperPro Designer ...


A Single Dose Polyanhydride-Based Nanovaccine Against Paratuberculosis Infection, Akanksha Thukral, Kathleen Ross, Chungyi Hansen, Yashdeep Phanse, Balaji Narasimhan, Howard Steinberg, Adel M. Talaat 2020 University of Wisconsin, Madison

A Single Dose Polyanhydride-Based Nanovaccine Against Paratuberculosis Infection, Akanksha Thukral, Kathleen Ross, Chungyi Hansen, Yashdeep Phanse, Balaji Narasimhan, Howard Steinberg, Adel M. Talaat

Chemical and Biological Engineering Publications

Mycobacterium avium subsp. paratuberculosis (M. paratuberculosis) causes Johne’s disease in ruminants and is characterized by chronic gastroenteritis leading to heavy economic losses to the dairy industry worldwide. The currently available vaccine (inactivated bacterin in oil base) is not effective in preventing pathogen shedding and is rarely used to control Johne’s disease in dairy herds. To develop a better vaccine that can prevent the spread of Johne’s disease, we utilized polyanhydride nanoparticles (PAN) to encapsulate mycobacterial antigens composed of whole cell lysate (PAN-Lysate) and culture filtrate (PAN-Cf) of M. paratuberculosis. These nanoparticle-based vaccines (i.e., nanovaccines) were well ...


Utilization Of Mechanocatalytic Oligosaccharides By Ethanologenic Escherichia Coli As A Model Microbial Cell Factory, Tao Jin, Mats Käldström, Adriana Benavides, Marcelo D. Kaufman Rechulski, Laura R. Jarboe 2020 Iowa State University

Utilization Of Mechanocatalytic Oligosaccharides By Ethanologenic Escherichia Coli As A Model Microbial Cell Factory, Tao Jin, Mats Käldström, Adriana Benavides, Marcelo D. Kaufman Rechulski, Laura R. Jarboe

Chemical and Biological Engineering Publications

Mechanocatalysis is a promising method for depolymerization of lignocellulosic biomass. Microbial utilization of the resulting oligosaccharides is one potential route of adding value to the depolymerized biomass. However, it is unclear how readily these oligosaccharides are utilized by standard cell factories. Here, we investigate utilization of cellulose subjected to mechanocatalytic depolymerization, using ethanologenic Escherichia coli as a model fermentation organism. The mechanocatalytic oligosaccharides supported ethanol titers similar to those observed when glucose was provided at comparable concentrations. Tracking of the various oligomers, using maltose (alpha-1,4) and cellobiose (beta-1,4) oligomers as representative standards of the orientation, but not linkage ...


Full-Set Measurements Dataset For A Water-Based Drilling Fluid Utilizing Biodegradable Environmentally Friendly Drilling Fluid Additives Generated From Waste, Abo Taleb Al-Hameedi, Husam Hasan Alkinani, Shari Dunn-Norman, Mohammed M. Alkhamis, Justin D. Feliz 2020 Missouri University of Science and Technology

Full-Set Measurements Dataset For A Water-Based Drilling Fluid Utilizing Biodegradable Environmentally Friendly Drilling Fluid Additives Generated From Waste, Abo Taleb Al-Hameedi, Husam Hasan Alkinani, Shari Dunn-Norman, Mohammed M. Alkhamis, Justin D. Feliz

Geosciences and Geological and Petroleum Engineering Faculty Research & Creative Works

The oil and gas industry is moving towards more environmentally friendly practices. The environmental regulations regarding drilling waste management and disposal are motivating the industry to be more efficient with drilling operations. Environmentally friendly drilling fluid additives used in drilling operations reduces not only the negative implications on the environment but also reduces costs. This paper provides an experimental dataset of utilizing biodegradable waste materials as environmentally friendly drilling fluid additives. The data were collected through experimental evaluations of several waste materials including Potato Peels Powder (PPP), Mandarin Peels Powder (MPP), Fibrous Food Waste Material (FFWM), Palm Tree Leaves Powder ...


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