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Articles 3991 - 4020 of 14150

Full-Text Articles in Engineering

Hybrid Electro-Plasmonic Neural Stimulation With Visible-Light-Sensitive Gold Nanoparticles, Ratka Damnjanovic, Parveen Bazard, Robert D. Frisina, Venkat R. Bhethanabotla Sep 2020

Hybrid Electro-Plasmonic Neural Stimulation With Visible-Light-Sensitive Gold Nanoparticles, Ratka Damnjanovic, Parveen Bazard, Robert D. Frisina, Venkat R. Bhethanabotla

Chemical and Biochemical Engineering Faculty Research & Creative Works

Biomedical prosthetics utilizing electrical stimulation have limited, effective spatial resolution due to spread of electrical currents to surrounding tissue, causing nonselective stimulation. So, precise spatial resolution is not possible for traditional neural prosthetic devices, such as cochlear implants. More recently, alternative methods utilize optical stimulation, mainly infrared, sometimes paired with nanotechnology for stimulating action potentials. Infrared stimulation has its own drawbacks, as it may cause collateral heating of surrounding tissue. In previous work, we employed a plasmonic method for stimulation of an electrically excitable neuroblastoma cell line, which had limited success. Here, we report the development of a hybrid electro-plasmonic …

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Bio-Oils From Vacuum Ablative Pyrolysis Of Torrefied Tobacco Residues, Nattawut Khuenkaeo, Blake Macqueen, Thossaporn Onsree, Sangu Daiya, Nakorn Tippayawong, Jochen A. Lauterbach Sep 2020

Bio-Oils From Vacuum Ablative Pyrolysis Of Torrefied Tobacco Residues, Nattawut Khuenkaeo, Blake Macqueen, Thossaporn Onsree, Sangu Daiya, Nakorn Tippayawong, Jochen A. Lauterbach

Faculty Publications

Fast pyrolysis, in combination with torrefaction pretreatment, was used to convert tobacco residues to value-added bio-fuels and chemicals. Tobacco plant residues were torrefied at 220, 260, and 300 °C, before being pyrolyzed at 450, 500, 550, and 600 °C in a rotating blade ablative reactor under vacuum conditions to test the effects on product yields. With torrefaction, tobacco residues thermally decomposed 20-25% w/w at low temperatures. Torrefaction and pyrolysis temperatures were found to markedly affect pyrolytic product yields of bio-chars and bio-oils, while having no effect on gas-phase products. Bio-oil yields exhibited a direct relation with pyrolysis temperature and an …

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Epoxy-Functional Thermoplastic Copolymers And Their Incorporation Into Thermosetting Resins, Kayla Rose Sweet Sep 2020

Epoxy-Functional Thermoplastic Copolymers And Their Incorporation Into Thermosetting Resins, Kayla Rose Sweet

Theses and Dissertations

While polymers have secured a place in the consumer, industrial, and military markets over the last seventy years, the next generation of polymers must become more renewable, more adaptive, and higher performing to bridge industrial needs and environmental gaps. To this end, unique network configurations of copolymers and interpenetrating polymer networks (IPNs) have been employed to combine features of two or more polymers into a single material that surpasses the sum of its parts. The customization of polymer networks can be made possible via dual-functional monomers, molecules characterized by two different reactive substituents that allow for versatile methods of polymerization. …

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Bio-Oils From Vacuum Ablative Pyrolysis Of Torrefied Tobacco Residues, Nattawut Khuenkaeo, Blake Macqueen, Thossaporn Onsree, Sangu Daiya, Nakorn Tippayawong, Jochen A. Lauterbach Sep 2020

Bio-Oils From Vacuum Ablative Pyrolysis Of Torrefied Tobacco Residues, Nattawut Khuenkaeo, Blake Macqueen, Thossaporn Onsree, Sangu Daiya, Nakorn Tippayawong, Jochen A. Lauterbach

Faculty Publications

Fast pyrolysis, in combination with torrefaction pretreatment, was used to convert tobacco residues to value-added bio-fuels and chemicals. Tobacco plant residues were torrefied at 220, 260, and 300 °C, before being pyrolyzed at 450, 500, 550, and 600 °C in a rotating blade ablative reactor under vacuum conditions to test the effects on product yields. With torrefaction, tobacco residues thermally decomposed 20-25% w/w at low temperatures. Torrefaction and pyrolysis temperatures were found to markedly affect pyrolytic product yields of bio-chars and bio-oils, while having no effect on gas-phase products. Bio-oil yields exhibited a direct relation with pyrolysis temperature and an …

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Preparation Characterization And Tribological Behavior Of Lube Oil With Nanoparticles Additives, Waleed Alghani Sep 2020

Preparation Characterization And Tribological Behavior Of Lube Oil With Nanoparticles Additives, Waleed Alghani

Student Works (2020-2029)

There are many companies worldwide that would like to improve and upgrade the lube oil and enhance its performance. There is a big concern for the enhancement of lube oil by using nanotechnology and more precisely with using nanomaterial additives. Much work has made to explore and develop new sorts of lubricating oil nano-additives to diminish wear and friction in tribological configurations and to enhance surface morphology. It has noted that the use of dual nano-additives should examine the lubricating capacity and durability of lubricant. (TiO2 Anatase + Graphene) and (ZnO + Graphene) nanoparticles have selected to formulate nano-additives that …

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Isotherm And Kinetics Study For The Adsorption Of Nitrate From An Aqueous Solution Using A Modified Rice Straw, Dalia A. Ali Eng, Mohamed A. Sadek Prof., Nagwa Mahmoud Al-Mansi Prof, Ahmad Wafiq Aboelnasr Dr. Sep 2020

Isotherm And Kinetics Study For The Adsorption Of Nitrate From An Aqueous Solution Using A Modified Rice Straw, Dalia A. Ali Eng, Mohamed A. Sadek Prof., Nagwa Mahmoud Al-Mansi Prof, Ahmad Wafiq Aboelnasr Dr.

Chemical Engineering

In this research, modified rice straw (MRS) is proposed. The proposed production process of the modified rice straw (MRS) adsorbent is carried out by precipitation of iron nano particles on the surface of acid activated rice straw. The nitrate adsorption is carried out through batch experiments. The optimum nitrate removal 94.8 % was achieved at pH = 7, adsorbent dose 3 = g/L, 150 rpm, initial nitrate concentration = 23 mg/L and contact time 180 = min. The new adsorbent synthesis, kinetics and isotherm models were studied. The nitrate adsorption was well described by pseudo second order kinetic model (R2 …

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Synthesis And Characterization Of Thermosetting Epoxy Resins From Lignin-Inspired Phenolics, Kelli Marie Hambleton Sep 2020

Synthesis And Characterization Of Thermosetting Epoxy Resins From Lignin-Inspired Phenolics, Kelli Marie Hambleton

Theses and Dissertations

The need for renewable polymers able to replace their petrochemical counterparts continues to grow as sustainability concerns constantly rise. Bisguaiacol, a bio-based alternative to bisphenol-A, has been synthesized using vanillyl alcohol and guaiacol via an electrophilic aromatic condensation. Purification provides both bisguaiacol and an oligomeric coproduct with a consistent number average molecular weight and dispersity of about 650 Da and 1.00, respectively, across multiple reaction volume scales. This coproduct has been well characterized as a low molecular weight novolac averaging 5 hydroxyls per molecule and was transformed into an epoxy resin suitable for use in thermosetting resin development. By utilizing …

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Epoxidation Of Cardanol's Terminal Double Bond., Emre Kinaci, Erde Can, John J La Scala, Giuseppe R Palmese Sep 2020

Epoxidation Of Cardanol's Terminal Double Bond., Emre Kinaci, Erde Can, John J La Scala, Giuseppe R Palmese

Henry M. Rowan College of Engineering Departmental Research

In this investigation, the terminal double bonds of the side chain epoxidized cardanol glycidyl ether (SCECGE) molecule were further epoxidized in the presence of Oxone® (potassium peroxomonosulfate) and fluorinated acetone. Regular methods for the double bond epoxidation are not effective on the terminal double bonds because of their reduced electronegativity with respect to internal double bonds. The terminal double bond functionality of the SCECGE was epoxidized to nearly 70%, increasing the epoxy functionality of SCECGE from 2.45 to 2.65 epoxies/molecule as measured using proton magnetic nuclear resonance (1H-NMR). This modified material—side chain epoxidized cardanol glycidyl ether with terminal epoxies (TE-SCECGE)—was …

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Formulation Of A Model Resin System For Benchmarking Processing-Property Relationships In High-Performance Photo 3d Printing Applications., Jianwei Tu, Kamran Makarian, Nicolas J Alvarez, Giuseppe R Palmese Sep 2020

Formulation Of A Model Resin System For Benchmarking Processing-Property Relationships In High-Performance Photo 3d Printing Applications., Jianwei Tu, Kamran Makarian, Nicolas J Alvarez, Giuseppe R Palmese

Henry M. Rowan College of Engineering Departmental Research

A well-defined resin system is needed to serve as a benchmark for 3D printing of high-performance composites. This work describes the design and characterization of such a system that takes into account processability and performance considerations. The Grunberg–Nissan model for resin viscosity and the Fox equation for polymer Tg were used to determine proper monomer ratios. The target viscosity of the resin was below 500 cP, and the target final Tg of the cured polymer was 150 °C based on tan-δ peak from dynamic mechanical analysis. A tri-component model resin system, termed DA-2 resin, was determined and fully characterized. The …

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Synthesis And Characterization Of Water-Soluble Polyaniline For Hydrazine Detection / Hazira Hussin, Hazira Hussin Sep 2020

Synthesis And Characterization Of Water-Soluble Polyaniline For Hydrazine Detection / Hazira Hussin, Hazira Hussin

Student Works (2020-2029)

In this study, polyaniline (PAni) was synthesized through the chemical oxidation method using aniline (Ani) as a monomer, hydrochloric acid (HCl) as a dopant, and ammonium persulphate (APS) as an initiator. PAni was rendered water soluble through treating with cellulose derivatives. Cellulose derivatives such as methylcellulose (MC), hydroxypropyl cellulose (HPC), and hydroxypropyl methylcellulose (HPMC) were used as a stabilizer to improve the solubility of PAni in an aqueous medium. The water-soluble PAni-cellulose derivative was applied as a chemical sensor for hydrazine detection. The chemical structures and electrical conducting behaviours of PAni-cellulose derivatives were investigated using Fourier transform infrared (FTIR) and …

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Nanoparticle Catalyzed Hydrodesulfurization Of Diesel Fuel In A Trickle Bed Reactor: Experimental And Optimization Study, Saba A. Gheni, Saad A. Awad, Safaa M. R. Ahmed, Ghassan Abdullah, Muthanna H. Al-Dahhan Sep 2020

Nanoparticle Catalyzed Hydrodesulfurization Of Diesel Fuel In A Trickle Bed Reactor: Experimental And Optimization Study, Saba A. Gheni, Saad A. Awad, Safaa M. R. Ahmed, Ghassan Abdullah, Muthanna H. Al-Dahhan

Chemical and Biochemical Engineering Faculty Research & Creative Works

This work focuses on the preparation, simulation, and optimization of the hydrodesulfurization (HDS) of dibenzothiophene (DBT) using a nanocatalyst. A homemade nanocatalyst (3 percent Co, 10 percent Mo/γ-Al2O3 nanoparticles) was used in a trickle bed reactor (TBR). The HDS kinetic model was estimated based on experimental observations over ranges of operating conditions to evaluate kinetic parameters of the HDS process and apply the key parameters. Based on these parameters, the performance of the TBR catalyzed by the nanocatalyst was evaluated and scaled up to a commercial scale. Also, the selectivity of HDS reactions was also modeled to …

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Mathematical Modeling And Pointwise Validation Of A Spouted Bed Using An Enhanced Bed Elasticity Approach, Sebastián Uribe, Binbin Qi, Omar Farid, Muthanna H. Al-Dahhan Sep 2020

Mathematical Modeling And Pointwise Validation Of A Spouted Bed Using An Enhanced Bed Elasticity Approach, Sebastián Uribe, Binbin Qi, Omar Farid, Muthanna H. Al-Dahhan

Chemical and Biochemical Engineering Faculty Research & Creative Works

With a Euler-Euler (E2P) approach, a mathematical model for predicting the pointwise hydrodynamic behavior of a spouted bed was implemented though computational fluid dynamics (CFD) techniques. The model considered a bed elasticity approach in order to reduce the number of required sub-models to provide closure for the solids stress strain-tensor. However, no modulus of elasticity sub-model for a bed elasticity approach has been developed for spouted beds, and thus, large deviations in the predictions are obtained with common sub-models reported in literature. To overcome such a limitation, a new modulus of elasticity based on a sensitivity analysis was developed and …

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Synthesis And Characterization Of Silver Nanoparticles In Lamellar Lyotropic Liquid Crystal, Siti Mariah Mohd Yasin Sep 2020

Synthesis And Characterization Of Silver Nanoparticles In Lamellar Lyotropic Liquid Crystal, Siti Mariah Mohd Yasin

Student Works (2020-2029)

Lamellar lyotropic liquid crystal-silver nanoparticles (LLLC-AgNPs) are synthesized using the in-situ method. The polarizer microscope showed a mosaic-like pattern with fan shape textures. The high resolution transmission electron microscope (HRTEM) confirmed that the AgNPs are spherical in shape with 4 – 12 nm size. Differential scanning calorimetry (DSC) determined the LLLC-AgNPs transition anisotropic phase to the highly ordered isotropic phase at 300 °C, and crystallinity was completed at 350 °C. Thermogravimetric analysis (TGA) verified that the LLLC-AgNPs were completely decomposed at 700 °C. Ultra-violet visible spectroscopy (UV-vis) found the absorption peaks at around 400 nm and proved that the AgNPs …

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Optimizing Membrane Distillation With Solar Thermal Collectors, Andrew Mason, Ben Shulders, Siamak Nejati Sep 2020

Optimizing Membrane Distillation With Solar Thermal Collectors, Andrew Mason, Ben Shulders, Siamak Nejati

UCARE: Research Products

With rising human populations, the demand for freshwater is an ever-growing problem. One emerging technology to combat this problem is membrane distillation (MD). MD has several advantages for water desalination including 100% rejection of solute (salt, heavy metals, etc.) and mergeability with other affordable energy sources (solar heat, electric resistance, etc.) However, at the moment the specific energy consumption (SEC) of MD is very high due to low water production rates and large energy inputs to heat water. In a solar‐assisted design for MD, the high cost of solar collectors (~$200/m2) inhibits the low cost of water production in comparison …

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A Scoring Model To Evaluate Offshore Oil Projects: Case Of Eni And Mellitah Oil & Gas, Abdulhakim Giadedi Sep 2020

A Scoring Model To Evaluate Offshore Oil Projects: Case Of Eni And Mellitah Oil & Gas, Abdulhakim Giadedi

Dissertations and Theses

Offshore oil projects have many different and unique characteristics, such as larger project size, higher number of scopes, and higher complexity. In fact, offshore oil projects described as mega projects are ones that require significant assessment and acquisition methods in order to reduce risks and failures. Traditionally, cash flow analysis and return on investment are the most known factors to evaluate offshore oil projects. However, there are several other internal and external factors that affect the overall performance of offshore oil projects. A comprehensive approach and advanced tools are required to evaluate these factors that can have a significant impact …

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Challenges To Levulinic Acid And Humins Valuation In The Sugarcane Bagasse Biorefinery Concept, Emília Savioli Lopes, Jean Felipe Leal Silva, Elmer Ccopa Rivera, Alana Petrina Gomes, Melina Savioli Lopes, Rubens Maciel Filho, Laura Plazas Tovar Sep 2020

Challenges To Levulinic Acid And Humins Valuation In The Sugarcane Bagasse Biorefinery Concept, Emília Savioli Lopes, Jean Felipe Leal Silva, Elmer Ccopa Rivera, Alana Petrina Gomes, Melina Savioli Lopes, Rubens Maciel Filho, Laura Plazas Tovar

Faculty Publications

© 2020, Springer Science+Business Media, LLC, part of Springer Nature. Levulinic acid (LA) is currently one of the most promising chemicals derived from biomass. However, its large-scale production is hampered by the challenges in biomass hydrolysis and the poor selectivity due to the formation of humins (HUs). This study addresses these challenges using the biorefinery concept of biomass fractionation. A three-step process (pretreatment, delignification, and acid-catalyzed conversion) was optimized to produce LA from SCB considering the yield (YLA), efficiency (ELA), and concentration of LA (CLA) as functions of temperature, reaction time, acid concentration, and solids loading. By means of a …

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Drug-Loaded Chitosan Film Prepared Via Facile Solution Casting And Air-Drying Of Plain Water-Based Chitosan Solution For Ocular Drug Delivery, Boxuan Li, Juan Wang, Qin Gui, Hu Yang Sep 2020

Drug-Loaded Chitosan Film Prepared Via Facile Solution Casting And Air-Drying Of Plain Water-Based Chitosan Solution For Ocular Drug Delivery, Boxuan Li, Juan Wang, Qin Gui, Hu Yang

Chemical and Biochemical Engineering Faculty Research & Creative Works

Chitosan is a nature-based polymer with low toxicity, excellent biocompatibility and biodegradability. However, the intractable solubility of chitosan in water and most conventional solvents hampers its biomedical applications. Following the dissolution method for dissolving chitosan in plain water developed by us, chitosan was dissolved in ionic liquid followed by overnight freezing at −20 °C and subsequent solvent exchange with plain water at room temperature. In this study, we fabricated a drug-carrying chitosan film via solution casting and air-drying by using the plain water-based chitosan solution. Specifically, brimonidine tartrate (BT), an antiglaucoma drug, was dissolved in the plain-water based solution and …

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Preparation And Characterisation Of Heat Treated Oil Palm-Empty Fruit Bunch/High Density Polyethylene Composites, Nordin Nur Afifah Sep 2020

Preparation And Characterisation Of Heat Treated Oil Palm-Empty Fruit Bunch/High Density Polyethylene Composites, Nordin Nur Afifah

Student Works (2020-2029)

Natural fibre composites (NFCs) are composite materials, in which the reinforcing fibres are derived from renewable and carbon dioxide neutral resources such as wood or plants. NFC can be made by replacing synthetic fibres with various types of natural fibres. Oil palm empty fruit bunch (OPEFB) fibre and oil palm mesocarp fibre are two important types of fibrous materials left in the palm-oil industry. In this study, EFB will be used as a reinforcement to the high-density polyethylene (HDPE). EFB was heat-treated at 180°C using vacuum oven for one hour, extrusion compounded with HDPE at 10%, 20% and 30% weight …

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Process Improvement And Microbial Characterisation Of Biological Nitrogen Removal For Tropical Wastewater With Low Chemical Oxygen Demand/Nitrogen Ratio, How Seow Wah Sep 2020

Process Improvement And Microbial Characterisation Of Biological Nitrogen Removal For Tropical Wastewater With Low Chemical Oxygen Demand/Nitrogen Ratio, How Seow Wah

Student Works (2020-2029)

Malaysia has one of the most established biological nitrogen removal in wastewater treatment plants (WWTPs) among the developing Southeast Asian countries. The current WWTPs’ design and operating guidelines in Malaysia are mainly derived from other developed countries with more experiences in operating biological nitrogen removal. These design guidelines are good practices for WWTPs in the temperate climate region, but may not be optimal for the local wastewater characteristics and tropical climate in Malaysia. The local wastewater industry is keen to improve the design and operation of WWTPs to reduce the energy consumption and operating cost, which helps to foster a …

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Fractionation And Characterization Of Extracted Lignin From Oil Palm Empty Fruit Bunch Using Synthesized Deep Eutectic Solvents, Tan Yee Tong Sep 2020

Fractionation And Characterization Of Extracted Lignin From Oil Palm Empty Fruit Bunch Using Synthesized Deep Eutectic Solvents, Tan Yee Tong

Student Works (2020-2029)

Deep eutectic solvent (DES), a new generation green solvent has been introduced as an alternative pretreatment solvent due to its ability for lignocellulosic biomass fractionation and lignin extraction. Numerous types of compounds can be adopted as DES constituents, which has resulted in abundant variation of DES with varying properties. Selection of the suitable chemical compound category is therefore essential for optimum DES performance. However, investigation on the performance comparison between the different DES categories is lacking. In addition, despite its widely acknowledged effectiveness in biomass fractionation, the properties of DES-fractionated biopolymers, especially lignin are not well understood. Hence, this project …

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Theoretical Foundation Of Solution Dehydration In Porous Media: Effect Of Microstructure And Solute Interactions, Fernanda Sulantay Vargas Aug 2020

Theoretical Foundation Of Solution Dehydration In Porous Media: Effect Of Microstructure And Solute Interactions, Fernanda Sulantay Vargas

Honors Scholar Theses

Retention and evaporation of water have important implications in many natural and industrial settings. Here we focus on the effect of solute components (salts) as well as system geometry on evaporation rate of water. The study of multicomponent solutions with phase changes is challenging topic because of the complex and inter-connected physical phenomena that govern its dynamics. In the present work we review the theory of water evaporation and simulate evaporation of water as a function of composition and geometry for both droplets and bulk-scale (slit-like) systems. For droplets, we studied levitated droplets and droplets over hydrophobic and hydrophilic surfaces. …

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Numerical Study Of Paraffin Wax Melting In A Cavity With A Gradient Of Hot Wall Inclination, Agus Dwi Korawan Aug 2020

Numerical Study Of Paraffin Wax Melting In A Cavity With A Gradient Of Hot Wall Inclination, Agus Dwi Korawan

Makara Journal of Technology

The melting of a phase change material (PCM) in a cavity with a gradient of hot wall inclination was simulated numerically using five models, namely, Model-A, Model-B, Model-C, Model-D, and Model-E with gradients of −2, −4, ∞, 4, and 2, respectively. The PCM was paraffin wax, which was melted using an enthalpy porosity technique with a pressure-based method. Model-A was found to be the best model. For the completion of the melting process, the models were assigned with the liquid fraction of 1. Model-A required the shortest time, followed by Model-B, Model-C, Model-E, and Model-D, respectively. Compared with Model-C, Model-A …

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Influence Of Epoxidized Cardanol Functionality And Reactivity On Network Formation And Properties., Emre Kinaci, Erde Can, John J La Scala, Giuseppe R Palmese Aug 2020

Influence Of Epoxidized Cardanol Functionality And Reactivity On Network Formation And Properties., Emre Kinaci, Erde Can, John J La Scala, Giuseppe R Palmese

Henry M. Rowan College of Engineering Departmental Research

Cardanol is a renewable resource based on cashew nut shell liquid (CNSL), which consists of a phenol ring with a C15 long aliphatic side chain in the meta position with varying degrees of unsaturation. Cardanol glycidyl ether was chemically modified to form side-chain epoxidized cardanol glycidyl ether (SCECGE) with an average epoxy functionality of 2.45 per molecule and was cured with petroleum-based epoxy hardeners, 4-4'-methylenebis(cyclohexanamine) and diethylenetriamine, and a cardanol-based amine hardener. For comparison, cardanol-based diphenol diepoxy resin, NC514 (Cardolite), and a petroleum-based epoxy resin, diglycidyl ether of bisphenol-A (DGEBA) were also evaluated. Chemical and thermomechanical analyses showed that for …

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Ecg Processing And Analysis Technique Based On Neural Network Learning Vector Quantization, Talat Madievich Magrupov, Sherzod Kalandarovich Nеmatov, Yokubjon Talatovich Talatov Aug 2020

Ecg Processing And Analysis Technique Based On Neural Network Learning Vector Quantization, Talat Madievich Magrupov, Sherzod Kalandarovich Nеmatov, Yokubjon Talatovich Talatov

Chemical Technology, Control and Management

The main parameters of the electrocardiogram (ECG) were processed on the basis of the neural network apparatus. A decision support algorithm for ECG analysis using a neural network for learning vector quantization is proposed. For the study was chosen such features as the duration of QRS complex, RR interval, amplitude of R-wave and the change in the slope of ST segment and heart rate, which are five inputs to the neural network learning vector quantization. Methods of pre-processing and analysis of extraction of ECG functions based on the ECG database of a medical institution in Matlab are presented. The generalized …

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Static Characteristics Of Thermal Humidity Converters Of Liquid Materials In Continuous Flow, N.I. Avezova, P.R. Ismatullaev, Paraxat Matyakubova Aug 2020

Static Characteristics Of Thermal Humidity Converters Of Liquid Materials In Continuous Flow, N.I. Avezova, P.R. Ismatullaev, Paraxat Matyakubova

Chemical Technology, Control and Management

Thermal systems with distributed heat sources based on a pipeline segment with radial holes are proposed for the development of designs of thermal humidity converters for liquid materials. Across the liquid flow there are tubular arguments with cylindrical heat-sensitive elements, on the surface of which the heating element winding was wound, which significantly increased their sensitivity, speed, reliability and allowed the use of standard semiconductor heat-sensitive elements.

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Optimal Ratio Of Primary And Secondary Clarifier Characteristics In Wastewater Treatment Plants, Makhsud Idrisovich Makhmudov, Zafarbek Esanovich Kuziev, Siroj Sobirovich Nurov, Sanjar Siroj Ugli Sidikov Aug 2020

Optimal Ratio Of Primary And Secondary Clarifier Characteristics In Wastewater Treatment Plants, Makhsud Idrisovich Makhmudov, Zafarbek Esanovich Kuziev, Siroj Sobirovich Nurov, Sanjar Siroj Ugli Sidikov

Chemical Technology, Control and Management

The issues of optimization of aerobic biological wastewater treatment processes are considered. Optimal ratios of characteristics and sizes of primary and secondary sedimentation tanks, as well as their relationship with the concentration of activated sludge by volume, are revealed. Graphical representations of the dependence of the volumes of primary, secondary and total volumes of structures on the concentration of activated sludge in cleaning processes with low and high loads are obtained. Experimental studies have shown that the concentration of activated sludge in the aeration tank and the silt index directly affect the deposition characteristics of activated sludge, in particular the …

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Conceptual Basis For Modeling Multi-Cordinate Mechatronic Robot Modules, Yusupbekov Azizbek Nodirbekovich, Nazarov Khayriddin Nuritdinovich, Matyokubov Nurbek Rustamovich, Temurbek Omonboyevich Rakhimov Aug 2020

Conceptual Basis For Modeling Multi-Cordinate Mechatronic Robot Modules, Yusupbekov Azizbek Nodirbekovich, Nazarov Khayriddin Nuritdinovich, Matyokubov Nurbek Rustamovich, Temurbek Omonboyevich Rakhimov

Chemical Technology, Control and Management

The conceptual foundations of modeling multi-coordinate mechatronic modules of robots are considered. The use of a multi-coordinate mechatronic movement module in robots made it possible to obtain at the output of one module several linear and angular coordinates, which reduces the weight and dimensions of the robot and thereby improves its dynamic characteristics. The proposed original concept of the mathematical description of a multi-coordinate mechatronic module, which is focused on displaying their structural and operating features. A structural diagram of a developed industrial robot operating in a Cartesian coordinate system and built on the basis of a multi-coordinate mechatronic module …

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Capacity Transformer Of Coaxial And Cylindrical Form Of Humidity Meter, Erkin Uljaev, Utkirjon Murodillaevich Ubaydullaev, Shohrux Nurali O'G'Li Narzullaev Aug 2020

Capacity Transformer Of Coaxial And Cylindrical Form Of Humidity Meter, Erkin Uljaev, Utkirjon Murodillaevich Ubaydullaev, Shohrux Nurali O'G'Li Narzullaev

Chemical Technology, Control and Management

The question of development and calculation of construction of a coaxial and cylindrical form of the capacity transformer of a humidity meter is considered. As basic data, the sizes and the materials ditches allowing to measure the humidity of different volumes of bulks from 5 to 50 gr are selected. As materials of a ditch, plastic are selected, and as tanks, the magnetizing materials are selected. It is briefly cited the advantages and disadvantages of ways to measure humidity and the basic dielectric characteristics of capacitive converters. The electrical replacement scheme of the proposed capacitive converter was provided and the …

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Identification Of Transition Matrix Of Controlled Objects Under Parametric Uncertainty Condition, Uktam Farkhodovich Mamirov Aug 2020

Identification Of Transition Matrix Of Controlled Objects Under Parametric Uncertainty Condition, Uktam Farkhodovich Mamirov

Chemical Technology, Control and Management

The questions of formation and construction of algorithms for identification of elements of the transition matrix of controlled objects in conditions of parametric uncertainty are considered. To identify elements of the transition matrix, we suggest using a custom model based on the type of Kalman filtration equations. Algorithms for stable calculation of a pseudo-inverse matrix using matrix decomposition are analyzed. Regular algorithms for solving argumentative problems of minimization of the identification quality criterion are given. These algorithms allow us to regularize the problem of adaptive identification of the transition matrix of an object based on regular methods for minimizing functionals …

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Reliable Risk Assessment Method For Effective Organization Of Information Security At Enterprise, Fayzullajon Bakhtiyorovich Botirov Aug 2020

Reliable Risk Assessment Method For Effective Organization Of Information Security At Enterprise, Fayzullajon Bakhtiyorovich Botirov

Chemical Technology, Control and Management

The problems of the new industry 4.0 automation paradigm are considered and the latest technologies in the field of information and communication technologies that stimulate it are analyzed, including cyber-physical systems, cloud computing, the Internet of things and big data. Some methods of multidimensional, multi-faceted industrial representation and analysis of big data are proposed. The basics of big data processing using granular computing methods have been developed. Marked the emergence of the problem of creation of special cognitive tool for constructing artificial agents, understanding integrated intelligence enterprises. In the process of information protection at the enterprise, it is proposed to …

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