Engineering Commons^™

Effects Of Electron Beam Irradiation On Crmnv And Crmntiv High Entropy Alloys: Nano-Mechanical, Structural, And Thermodynamic Perspectives, N. A. Sultana, Y. S. Mohammed, S. J. Pendleton, J. Vennekate, G. Ciovati, X. Li, H. Baumgart, A. A. Elmustafa

Mechanical & Aerospace Engineering Faculty Publications

Beam exit windows are crucial components of any particle accelerator as they provide an interface between the beamline vacuum and target material at atmospheric media. For high beam power machines, special materials and designs are required to withstand high radiation and mechanical loads, while minimizing energy loss during transition and maximizing window lifetime. This research investigates the impact of electron beam exposure to bulk CrMnV and CrMnTiV high entropy alloys (HEAs) with the primary goal of identifying suitable candidate materials for the design of robust and durable exit window settings. The selection criteria include intrinsic characteristics, power dissipation, and mechanical …

Investigation Wettability Contact Angle Using 2d Imaging Technology, Saleh Alsayegh

Doctoral Dissertations

"Investigation wetting preference of tight carbonate reservoir rocks and several other unconventional reservoir rocks, and their relation to oil production, is becoming noticeably important for field development in Kuwait, as in many future unconventional tight carbonate reservoirs in the Middle East. The overall objective of this investigating and modeling study is to discover many fundamental relationships from totality wettability preference as a tool for reservoir recovery predictions and management. The investigation includes advancing position of water wet preference into smaller capillaries of the matrix voids and incrementally more oil-wet into larger capillaries of natural fractures (NF). Also, investigating water/ oil …

Investigating The Potential Of Blended Feedstocks For Biofuel Production Via Pyrolysis Process: Experimental And Aspen Simulation Approach, Hasan Jawad Hammood Al-Abedi

Doctoral Dissertations

"The development of renewable energy sources has become increasingly urgent considering the climate crisis and the need to reduce greenhouse gas emissions. Pyrolysis, which is decomposition of an organic feedstock without oxygen, is a thermo-chemical process that has garnered significant attention as a promising technology for sustainable energy production, capable of converting biomass and waste materials into biofuels.

The primary objective of this study is to investigate the pyrolysis and co-pyrolysis behaviors of corn stover (CS), refuse-derived fuel (RDF), and oil shale (OS) in equal mass ratios. Utilizing a thermogravimetric analyzer and differential scanning calorimetry (DSC), the co-pyrolysis process is …

Paleoecological And Paleoclimatic Reconstructions Based On Holocene Sediment Cores, Lake Izabal, Eastern Guatemala, Erdoo Mongol

Doctoral Dissertations

"The Maya Region in Central America is characterized by pronounced discrepancies in precipitation, resulting in high precipitation gradients that support large-scale differences in vegetation across the region. Several lake deposits and other paleoclimate archives in the region have been studied to reconstruct past climates and palaeoecological conditions. However, actual data from proxy records have not been qualitatively and quantitatively utilized to interpret the behavior of the vegetation in moister areas within the Maya Region, such as the Lake Izabal Basin (LIB). The palynomorphs from two sediment cores in the LIB provided a good opportunity to infer the patterns of past …

Topography Of The 410 And 660 Km Discontinuities Beneath The Tibetan Plateau And Adjacent Areas, Zexin Miao

Doctoral Dissertations

"The Tibetan Plateau represents the ongoing geotectonic aftermath of a continental collision initiated approximately 65 million years ago. Despite numerous seismological studies, controversies remain regarding the structure, evolution, and dynamics of the crust and mantle beneath Tibetan Plateau. In this study, we used teleseismic broadband data to investigate the topography of the mantle transition zone (MTZ) discontinuities. A total of ~655,000 receiver functions from 735 stations was utilized to image the 410 and 660 km discontinuities bordering the MTZ. Combining the observed and velocity corrected results, several areas in the central Tibet exhibit a typical d410 and an anomalously deep …

The Effects Of Uv-Radiation On The Removal Of Microplastics In Water Using Agglomeration-Micro-Flotation, Palot Srichonphaisarn

Chulalongkorn University Theses and Dissertations (Chula ETD)

Microplastics, plastic particles with diameter 1 micrometer to 5 millimeters, can disturb marine ecosystems due to their small size and surface properties which can be a carrier for hazardous matters. While wastewater treatment plants could remove some microplastics but some of them remain. Among the various removal techniques, flotation is a potential method due to the hydrophobic nature of microplastics. This study investigates the effects of ultraviolet radiation on the surface wettability of microplastics and removal efficiency of microplastics. The 6 types of microplastics were prepared from plastic boards. After the ultraviolet radiation, the results showed that ultraviolet radiation could …

Effect Of Zeolite Support Of Nickel-Copper Catalyst On Conversion Of Palm Oil To Sustainable Aviation Fuel, Natnicha Ritmun

Chulalongkorn University Theses and Dissertations (Chula ETD)

Sustainable aviation fuel (SAF) is increasingly recognized as a critical alternative for reducing the environmental impact of the aviation industry, which is a significant source of global greenhouse gas emissions. SAF production primarily utilizes vegetable oils as feedstock rather than biomass, due to their low functional group content and chemical structure that closely resembles that of fossil fuels. This research focuses on the development of bimetallic catalysts made from nickel, with copper as promoters, supported on various zeolites including SAPO-11, Zeolite Y, and Zeolite ZSM-5. The chemical and physical properties of these catalysts were analyzed using several techniques, including X-ray …

Methanol Production Via Co2 Hydrogenation In Gas Phase With 1-Propanol Assisted In Fixed Bed Reactor, Narakorn Ninkaew

Chulalongkorn University Theses and Dissertations (Chula ETD)

The methanol synthesis from CO2 hydrogenation reaction using 1-propanol alcohol was selected to solvent involved in the new reaction pathway with CO2 and H2 as reactants in a gas phase fixed bed reactor. To study the effect of temperature at 160-230 °C, space velocity (GHSV) at 60-592 h-1, the mole ratio of 1 propanol to CO2 at 0-1.25, H2 to CO2 mole ratio of 5 and a pressure of 30 bar. From the experiment, the mole ratio of 1 propanol to CO2 at 1, the temperature of 170 °C and the space velocity of 420 h-1. It was found that …

การผลิตเมทานอลจากปฏิกิริยาไฮโดรจีเนชันของแก๊สคาร์บอนไดออกไซด์ที่มีเอทานอลในสภาวะแก๊สที่เครื่องปฏิกรณ์แบบเบดนิ่ง, ชนาภัทร บุญประคม

Chulalongkorn University Theses and Dissertations (Chula ETD)

เมทานอลเป็นวัตถุดิบเคมีตั้งต้นที่สำคัญสำหรับอุตสาหกรรมเคมี อุตสาหกรรมยา อุตสาหกรรมเครื่องใช้ไฟฟ้า ในวิทยานิพนธ์นี้จึงมีความสนใจในการศึกษาผลของเอทานอลในการผลิตเมทานอลจากปฏิกิริยาไฮโดรจีเนชันของแก๊สคาร์บอนไดออกไซด์ที่มีเอทานอลในสภาวะแก๊สที่เครื่องปฏิกรณ์แบบเบดนิ่ง สำหรับการศึกษาผลของเอทานอล แบ่งการศึกษาออกเป็น 3 ขั้นตอนหลัก ได้แก่ การศึกษาเส้นทางการเกิดปฏิกิริยา การตรวจสอบปัจจัยที่มีผลต่อการผลิตเมทานอล และการคำนวณที่สภาวะสมดุลด้วยโปรแกรม Aspen Plus การศึกษาภายใต้สมมติฐานว่า การเพิ่มเอทานอลในการผลิตเมทานอลจากปฏิกิริยาไฮโดรจีเนชันของแก๊สคาร์บอนไดออกไซด์ จะสามารถทำให้ผลิตเมทานอลได้ดีที่อุณหภูมิต่ำ ผลการศึกษาพบว่า การเพิ่มเอทานอลในกระบวนการเปลี่ยนเส้นทางปฏิกิริยา ทำให้เกิดเอทธิลฟอร์เมทเป็นตัวกลางในการสร้างเมทานอล การศึกษาอุณหภูมิ พบว่า การลดอุณหภูมิช่วยให้ปฏิกิริยาไฮโดรจีเนชันของคาร์บอนไดออกไซด์เป็นเอทิลฟอร์เมตและปฏิกิริยาไฮโดรจีเนชันของเอทิลฟอร์เมตเป็นเมทานอลและเอทานอลมีประสิทธิภาพมากขึ้น อีกทั้งยังสามารถช่วยลดการเกิดปฏิกิริยาข้างเคียง ทั้งนี้ สันนิษฐานได้ว่าเอทานอลที่ถูกเติมเข้ามามีผลในการแย่งจับตำแหน่งออกฤทธิ์ (active site) บนตัวเร่งปฏิกิริยา ทำให้การเกิดปฏิกิริยาไฮโดรจีเนชันของคาร์บอนมอนอกไซด์ที่อุณหภูมิ 200 และ 230 องศาเซลเซียสไม่สามารถทำได้อย่างมีประสิทธิภาพ นอกจากนี้ การศึกษาของการเพิ่มความเร็วเชิงพื้นที่พบว่า ค่าร้อยละการเปลี่ยนแปลงคาร์บอนไดออกไซด์และค่าร้อยละผลผลิตของเมทานอลลดลง เนื่องจากลดเวลาสัมผัสระหว่างสารตั้งต้นกับตำแหน่งที่เกิดปฏิกิริยาของตัวเร่งปฏิกิริยา ส่งผลให้สารตั้งต้นสัมผัสกับตัวเร่งปฏิกิริยาน้อยลงทำให้ไม่มีเวลามากพอที่จะเกิดปฏิกิริยาอย่างสมบูรณ์ อีกทั้งพบเอทิลฟอร์เมตน้อย สันนิษฐานได้ว่าปฏิกิริยาไฮโดรจีเนชันของเอทิลฟอร์เมตเป็นเมทานอลและเอทานอลนั้นเกิดขึ้นอย่างรวดเร็วในช่วงค่าความเร็วเชิงพื้นที่ที่กำหนด อีกทั้งพบว่าการลดความเร็วเชิงพื้นที่ ที่อุณหภูมิ 200 และ 230 องศาเซลเซียส ทำให้ปฏิกิริยาไฮโดรจีเนชันของคาร์บอนมอนอกไซด์เกิดขึ้นอย่างมีประสิทธิภาพมากยิ่งขึ้น ผลการศึกษาการเพิ่มอัตราส่วนโมลของเอทานอลต่อคาร์บอนไดออกไซด์ โดยคาดว่าจะช่วยให้เพิ่มค่าการเปลี่ยนแปลงคาร์บอนไดออกไซด์และผลผลิตของเมทานอล ผลการทดลองที่ความเร็วเชิงพื้นที่ 296 ชม.-1 ปฏิกิริยาไฮโดรจีเนชันของคาร์บอนไดออกไซด์และการไฮโดรจีเนชันของเอทิลฟอร์เมต พบว่า การเพิ่มเอทานอลในปฏิกิริยาจะช่วยเพิ่มเอทิลฟอร์เมต อย่างไรก็ตาม หากเพิ่มสัดส่วนเอทานอลที่มากเกินไปจะไปจำกัดการผลิตเมทานอล จากผลการศึกษาการเปลี่ยนแปลงอัตราส่วนโมลเอทานอลต่อคาร์บอนไดออกไซด์ภายใต้การเปลี่ยนความเข้มข้นของสารตั้งต้น พบว่า การเพิ่มความเข้มข้นของคาร์บอนไดออกไซด์และไฮโดรเจนในกรณีที่ไม่มีเอทานอล มีค่าร้อยละการเปลี่ยนแปลงคาร์บอนไดออกไซด์และค่าร้อยละผลผลิตของเมทานอลน้อยกว่ากรณีที่มีเอทานอล แสดงให้เห็นถึงอัตราการเกิดปฏิกิริยาที่ช้ากว่ากรณีที่มีเอทานอล จากผลการศึกษานี้ทำให้เอทานอลทำหน้าที่คล้ายกับตัวทำละลายเชิงเร่งปฏิกิริยา (catalytic solvent)

Oxidative Cleavage Of Oleic Acid At High Temperature Under Autogenous Pressure, Nichkamon Suwannit

Chulalongkorn University Theses and Dissertations (Chula ETD)

The oxidative cleavage of oleic acid to produce azelaic acid and nonanoic acid, both of which are high-value chemicals and essential precursors in the pharmaceutical and plastic industries, was investigated. The objectives of this study were to examine the influence of temperature on reaction mechanisms, product formation, and reaction efficiency, as well as to optimize the reaction conditions for potential industrial applications. The research utilized hydrogen peroxide (H2O2) as the oxidizing agent, tungsten oxide (WO3) as the catalyst, and tert-butanol as a co-solvent under self-generated autogenous pressure conditions. The temperature range studied was 80 to 160°C, aiming to evaluate the …

Uv-Enhanced Catalytic Oxidative Cleavage Of Oleic Acid., Trinnasit Wittayakullertsin

Chulalongkorn University Theses and Dissertations (Chula ETD)

Oleic acid, a key component of plant oils such as palm oil, is a versatile feedstock for producing high-value bio-based chemicals. Utilizing its potential aligns with Thailand's objective of promoting sustainability as a premier palm oil producer. The conventional oxidative cleavage of oleic acid typically requires extreme conditions, including high temperatures, and ozone, which are expensive and harmful to the environment. This research provides an innovative method for utilizing ultraviolet (UV) radiation to increase oxidative cleavage at low temperatures (below 80°C). It employs hydrogen peroxide (H2O2) as an oxidizing agent and tungsten trioxide (WO3) as a catalyst to generate hydroxyl …

Ultrafine Fully Vulcanized Natural Rubber Modified By Grafting With Methyl Methacrylate Monomer As Toughening Modifiers For Polylactic Acid, Panyawutthi Rimdusit

Chulalongkorn University Theses and Dissertations (Chula ETD)

This work focused on toughening polylactic acid (PLA) with an abundant and sustainable bio-based filler from natural rubber. Deproteinized natural rubber (DPNR) was modified by grafting with methyl methacrylate monomer (MMA) and further crosslinked via e-beam irradiation and spray drying to achieve ultrafine fully vulcanized powdered natural rubber grafted with polymethylmethacrylate (UFPNR-g-PMMA) to solves in the challenges of incompatibility between the DPNR and PLA. Interestingly, UFPNR-g-PMMA showed no agglomeration between rubber particles compared to that of neat UFPNR which showed partial agglomeration after irradiation crosslinking. The flexural toughness shows a significant improvement (351%) to 11280 ± 1522 kJ/m3 compared to …

Development Of Silica-Based Support Material From Sugarcane Bagasse Ash For Synthesis Of Carbon Nanotubes, Maturada Assawagetmanee

Chulalongkorn University Theses and Dissertations (Chula ETD)

Sugarcane bagasse ash (SCBA), an abundant agricultural residue, is converted into high-value silica powder through a novel route involving calcination and acid leaching. This transformative process not only valorizes waste biomass but also yields silica nanoparticles with tailored microstructural properties suitable for application in carbon nanotube (CNT) production. The resultant silica powder was utilized as a catalyst support impregnated with Fe nanocatalyst for synthesizing CNTs from benzene. The effective route with a process sequence of 1 M HCl acid leaching followed by calcination could provide silica powder with a specific surface area of 12.29 m2/g, which could accommodate Fe nanocatalyst …

Direct Blue 86 Textile Dye Removal From Aqueous Solution Using Rice Husk-Based Adsorbent, M. Zulbahari M. Zua, Muhammad Raza Ul Mustafa, Mohamed Hasnain Isa, Teh Sabariah Binti Abd Manan, Naimah Ibrahim, Rozeana Hj Md Juani, Wida Susanty Hj Suhaili, Asmaal Muizz Sallehhin Bin Hj Mohammad Sultan, Zuliana Binti Hj Nayan

ASEAN Journal on Science and Technology for Development

Adsorption by activated carbon is an effective method of dye removal. However, due to high production and regeneration costs of activated carbon, various studies on low-cost adsorbents have been conducted. Agricultural waste such as rice husk (RH) is seen to be a good adsorbent for dye removal. Moreover, rice husk is readily available. In this study, rice husk-based adsorbents were prepared by chemical and thermal treatments. Standard curve (colour vs absorbance) for Direct Blue 86 (DB 86) was prepared to determine the concentration of dye before and after adsorption. The adsorption potential of the adsorbent for textile dye DB 86 …

The Phase Behaviour And Stability Of An Environmentally Friendly Oil-In-Water Emulsion Produced Using Balanites Aegyptiaca Oil And Green Emulsifiers, Sami A.M. Yagoub, Swee P. Yeap, Nurudeen P. Yekeen, Mohammed A. Ayoub

Research outputs 2022 to 2026

Due to environmental concerns about extensively using chemical emulsifiers and hydrocarbon oil in emulsion systems formation, recent research has shifted to using natural emulsifiers and oil. This study produced green emulsion using Balanites aegyptiaca oil and various bio-emulsifiers (such as sodium alginate, carboxymethylcellulose, guar gum, and Saponin). Phase behavior and stability of the emulsion were tested at different NaCl concentrations over one month of ageing. The emulsion was also produced using Balanites aegyptiaca oil and synthetic emulsifiers (Tween 80 and Triton X-100). The critical micelle concentrations of emulsifiers were determined and used as the fixed concentration for the green emulsion …

Engineering Mussel Foot Protein 5 (Mfp5) For Enhanced Adhesive Performance In Tendon And Bone Repair, Ziyue Zhu

McKelvey School of Engineering Graduate Student Theses & Dissertations

This study explores the development of Mussel Foot Protein 5 (MFP5) bioadhesives to improve tendon-to-tendon and tendon-to-bone adhesive outcomes. MFP5, known for its underwater adhesive properties, was synthesized using recombinant techniques and optimized through coacervation and cross-linking. Adhesion tests demonstrated the superior performance of the optimized MFP5 adhesive on the tendon and bone samples. Improved protein concentration testing and purification methods enhanced MFP5 yield and consistency. Future research will focus on further standardization, exploring alternative purification methods, and evaluating the adhesive's performance in animal models. This study lays a foundation for developing robust MFP5-based bioadhesives, potentially revolutionizing surgical repair techniques …

Triphlapan: Predicting Hla Molecules Binding Peptides Based On Triple Coding Matrix And Transfer Learning, Meng Wang, Chuqi Lei, Jianxin Wang, Yaohang Li, Min Li

Computer Science Faculty Publications

Human leukocyte antigen (HLA) recognizes foreign threats and triggers immune responses by presenting peptides to T cells. Computationally modeling the binding patterns between peptide and HLA is very important for the development of tumor vaccines. However, it is still a big challenge to accurately predict HLA molecules binding peptides. In this paper, we develop a new model TripHLApan for predicting HLA molecules binding peptides by integrating triple coding matrix, BiGRU + Attention models, and transfer learning strategy. We have found the main interaction site regions between HLA molecules and peptides, as well as the correlation between HLA encoding and binding …

Xylan Fast Pyrolysis: An Experimental And Modelling Study Of Particle Changes And Volatiles Release, F Cerciello, E Freisewinkel, A Coppola, C Ontyd, D Tarlinski, Martin Schiemann, Osvalda Senneca, Pierro Salatino, C Allouis, Victor Scherer, Thomas H. Fletcher

Faculty Publications

Biomass char particles produced by pyrolysis may have different morphologies, which has important implications on burning mode, conversion rate and boiler efficiency. These features are difficult to address due to the complexity of biomass structure and pyrolysis reaction models. The present work reports preliminary results on the morphological changes and volatile release that solid particles of Xylan experience upon fast heating in a Drop Tube Reactor (DTR) and in a Heated Strip Reactor (HSR) in a range of temperature between 1100 and 1573 K under inert atmosphere with heating rate in the order of 10³ K/s. Two different Xylan …

Parametrization Of Fluid Models For Electrical Breakdown Of Nitrogen At Atmospheric Pressure, Shirshak K. Dhali

Electrical & Computer Engineering Faculty Publications

In the transient phase of an atmospheric pressure discharge, the avalanche turns into a streamer discharge with time. Hydrodynamic fluid models are frequently used to describe the formation and propagation of streamers, where charge particle transport is dominated by the creation of space charge. The required electron transport data and rate coefficients for the fluid model are parameterized using the local mean energy approximation (LMEA) and the local field approximation (LFA). In atmospheric pressure applications, the excited species produced in the electrical discharge determine the subsequent conversion chemistry. We performed the fluid model simulation of streamers in nitrogen gas at …

Engineering Applications Of Artificial Intelligence To Forecast Production Of Shale Wells, Yasir Jassim Alkalby

Graduate Theses, Dissertations, and Problem Reports (ETD)

This study examines the application of artificial intelligence (AI) and supervised machine learning techniques to forecast production from unconventional shale wells, utilizing actual field measurement data over a period of two years. Traditional methods, such as decline curve analysis, offer valuable insights but often fail to fully capture the complex nuances affecting productivity and tend to rely excessively on empirical equations.

In this research, the AI-based Shale Analytics approach, introduced by Mohaghegh in 2017, is employed. This method leverages Big Data Analytics to identify unique patterns from actual field observations, enhancing the evaluation and quantification of various productivity factors, facilitating …

Recovery Of Ionic Liquid From The Model Solution Mixture Mimicking The Catalytically Hydrolyzed Cellulose Product Utilizing Amberlyst Ion-Exchange Resin, Chhabilal Regmi, Chidambaram Thamariselvan, Zhexi Zhu, Xianghong Qian, S. Ranil Wickramasinghe

Chemical Engineering Faculty Publications and Presentations

The hydrolysis of cellulose using ionic liquid (IL) has been extensively studied but there is limited understanding of the removal of IL from the biomass hydrolysate. Finding a suitable method for the recovery and reuse of IL is one of the biggest challenges before its large-scale application. Selecting an appropriate combined recovery process is very important. This study proposed a facile ion-exchange combined method for the recovery of IL from the modeled cellulose hydrolysate mixture containing sugars as well as γ-valerolactone (GVL) via an adsorption–desorption mechanism using sulfonic acid cation-exchange (Amberlyst 15 (H)) resin. The results showed that the resin …

Development Of Tio2/Nh2-Mil-125 Nanocomposite For The Removal Of Ciprofloxacin Under Induced Solar Irradiation, Bilkis Mojisola Ajiwokewu

Theses

This research focuses on the development and application of Metal-Organic Frameworks (MOFs)-based nanocomposites for the photocatalytic removal of pharmaceutical contaminants, with a specific emphasis on ciprofloxacin (CIP). The photocatalytic degradation of CIP was investigated using as-synthesized photocatalysts of TiO₂ nanowires (TiO₂NWs), bare MOF of NH₂-MIL-125, TiO₂NW/NH₂-MIL-125 composite, and Lanthanum (La)-doped composite. Intriguingly, the TiO₂NW/NH₂-MIL-125 composite exhibited the highest efficiency, achieving a photodegradation rate of 0.0111 min-1, surpassing the independent performances of bare MOF of NH₂-MIL-125 and TiO₂NW. The observed efficiency was attributed to …

Assessing The Feasibility And Mechanism Of Destructive Removal Of Per- And Polyfluoroalkyl Substances (Pfas) From Water, Kaushik Vinaykumar Londhe

Dissertations

One of the most pertinent challenges faced by the drinking water community is the widespread contamination of per- and polyfluoroalkyl substances (PFAS). These anthropogenic chemicals have been ubiquitously used in everyday products such as carpets, stain repellents, dyes, shampoos, non-stick cookware as well as in aqueous firefighting foams. PFAS are linked with adverse health effects in humans such as thyroid disease, obesity, immunological and reproductive disorders and linked to cancer in adults and low birth weight and developmental defects in infants.

Conventional water treatment technologies have proven to be largely ineffective in PFAS remediation, due to their extreme stability and …

Classification Of Oil Products According To The Nomenclature Of Goods, Kurbankul Mavlankulovych Karimkulov Profesor, Azoda Abdurahmanova

Technical science and innovation

The article analyzes types of vegetable oils. Simple methods of determining their quality using liquid gas chromatography have been developed. Recommendations for improving the classification of foreign economic activity based on commodity nomenclature were developed and recommended for customs operations. “Fats and oils of animal, vegetable or microbiological origin and products of their breakdown; prepared edible fats; waxes of animal or vegetable origin” was called. Animal fats, including pork, beef, sheep, goat, fish and oils of animals such as marine mammals are classified according to the Nomenclature of Foreign Economic Activities of the Republic of Uzbekistan in commodity headings 1501-1506 …

Advancing Polymer Sustainability Through Custom Interpenetrating Polymer Network Synthesis, Processing, And Design, Alexandra Maria Lehman-Chong

Theses and Dissertations

The need for improving polymer sustainability is as ubiquitous as the role of polymers in modern society. Interpenetrating polymer network (IPN) design flexibility offers opportunities for improved polymer sustainability while balancing desired polymer properties for various applications. This work investigates the structure-property-processing relationships of IPNs judiciously designed under the framework of the polymer life cycle. Sustainable polymer design was largely considered at the feedstock and manufacturing stages while considering overall polymer performance. Chemicals from bio-based feedstocks were used to design a full simultaneous polybenzoxazine-epoxy IPN, focusing on the effects of monomer and polymer structure on polymer properties. Processing-property relationships were …

Reducing Food Scarcity: The Benefits Of Urban Farming, S.A. Claudell, Emilio Mejia

Journal of Nonprofit Innovation

Urban farming can enhance the lives of communities and help reduce food scarcity. This paper presents a conceptual prototype of an efficient urban farming community that can be scaled for a single apartment building or an entire community across all global geoeconomics regions, including densely populated cities and rural, developing towns and communities. When deployed in coordination with smart crop choices, local farm support, and efficient transportation then the result isn’t just sustainability, but also increasing fresh produce accessibility, optimizing nutritional value, eliminating the use of ‘forever chemicals’, reducing transportation costs, and fostering global environmental benefits.

Imagine Doris, who is …

Algorithms For Synthesis Of Adaptive Control Systems With A Customized Model Using The Speed Gradient Method, Jasur Sevinov, Oxunjon Boborayimov

Chemical Technology, Control and Management

Algorithms are considered for the synthesis of adaptive control systems with a customized model based on the speed gradient method. For the synthesis of adaptive control systems, the identification approach is based on obtaining estimates of the unknown parameters in the object. By calculating the speed gradient, identification algorithms with an explicit and implicit customized model were obtained as well as that in sliding modes. A joint solution is given to the interrelated problems of identifying parameters with insufficient current information. The position of an object is about assessing the state with insufficient a priori information about its parameters. This …

Improvement Of Calorimetric Quality Analyzers For Substances, Makhfuza Azimovna Radjabova

Chemical Technology, Control and Management

It is noted that the development of intelligent means of measuring qualitative indices is of topical importance. Since the quality of many substances is determined by optical methods, an algorithm for spectrophotometric data processing has been developed, which consists of primary data processing (stage I) and determination of qualitative indices of liquid products (stage II). Since the task of numerical determination of colour characteristics of transmittance coefficients of liquid samples is incorrectly set, it is recommended to use regularization methods of A.N.Tikhonov to improve metrological characteristics of the device. On the basis of regularization methods for solving incorrect problems, algorithms …

Life Cycle Management Of A Technological Complex For Separating Multicomponent Mixtures Under Conditions Of Uncertainty Of Parameters, Yusuf Shodievich Avazov

Chemical Technology, Control and Management

The issue of control the lifecycle of technological complexes of multicomponent mixtures is considered, taking into account the uncertainty of parameters. Among uncertainties such as parameter uncertainty, model uncertainty, choice uncertainty under variability, spatial variability uncertainty, temporal variability uncertainty, inter-site variability uncertainty, more attention is paid to input parameter uncertainty and action uncertainty. The rectification technology is schematically presented, the influence of parameter uncertainty on the technological functions of the rectification complex. The scheme analyzes the control and assessment of “uncertainty” to repeat the lifecycle of the rectification complex and make changes to the components of the rectification complex technology. …

Improvements Of The Control System For The Technological Process Of Drying Bulk Materials, Azizbek Nodirbekovich, Dilmurod Ikromovich

Chemical Technology, Control and Management

The issues of convective drying of bulk materials as objects of monitoring, control and advanced management are presented based on the results of simulation modeling of a complex heat and mass transfer process, taking into account the drying kinetics. As a result of the work of a number of them, in the last few decades neat hypotheses were formed about moisture migration in and around dried materials, which led to the creation of accurate mathematical models of drying behavior, with successfully applied in a wide range of fields. The reasons for this are the dynamics of processes in the drying …