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Articles 2821 - 2850 of 16703

Full-Text Articles in Engineering

Design Of Polymer Optical Fiber Icing Sensor And Detection Method Of Road Ice Thickness, Xie Qingzhong, Wang Ling, Ge Jingyong, Shi Ning, Zhang Jiupeng Sep 2023

Design Of Polymer Optical Fiber Icing Sensor And Detection Method Of Road Ice Thickness, Xie Qingzhong, Wang Ling, Ge Jingyong, Shi Ning, Zhang Jiupeng

Journal of China & Foreign Highway

To detect the icing condition and icing thickness of asphalt pavement in extreme weather conditions, this paper firstly compared the performance indexes of polymer optical fiber and quartz optical fiber, chose polymer optical fiber as the optical transmission medium, and selected the distribution mode of coaxial sensor probes. Meanwhile, it designed the weak signal detection circuit and finally completed the design of a polymer optical fiber road icing sensor. Secondly, it was verified that the effect of temperature on the icing detection results was negligible, and icing tests under different light intensities were conducted under simulated light, with the icing …

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Experimental And Simulation Study On Bond Degradation Of Fractured Prestressed Tendons, Yong Pan, Li Cong, Chen Guan, Xiang Dan, Hu Xianwei, Qi Honghe Sep 2023

Experimental And Simulation Study On Bond Degradation Of Fractured Prestressed Tendons, Yong Pan, Li Cong, Chen Guan, Xiang Dan, Hu Xianwei, Qi Honghe

Journal of China & Foreign Highway

To solve the corrosion and fracture of prestressed tendons in the end-anchor area of post-tensioned prestressed concrete (PC) girders under the chlorine salt environment, this paper employed electrochemically accelerated corrosion tests to obtain three PC members after the fracturing of prestressed tendons in the end-anchor area, and then carried out the static drawing test to study the effects of concrete strength and stirrup diameter on the bonding performance of prestressed tendons after fracturing. The results show that the bond damage of the strands starts at the drawing end and gradually develops to the free end. Additionally, increasing the concrete strength …

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Parameters Study On Durability Of Substation Structure Of Multi-Tower Suspension Bridge, Qin Xiao, Pan Ji, Xiao Rucheng Sep 2023

Parameters Study On Durability Of Substation Structure Of Multi-Tower Suspension Bridge, Qin Xiao, Pan Ji, Xiao Rucheng

Journal of China & Foreign Highway

Substation structures are important components of the bridge structure, and their durability will affect the service life of the overall bridge structure. Since the overall structure of a multi-tower suspension bridge is more flexible with larger deformation, and the cumulative displacement at the substation structure is also larger, the durability problem of the substation structure is more prominent under multi-tower suspension bridges. To qualitatively analyze the influence of the structural parameters of the bridge structure (including tower-beam connection and cable-beam connection methods) on the durability of the substation structure, this paper built a finite element model of a four-tower suspension …

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Optimization Of Bridge Life Cycle Maintenance Decision Based On Lca And Lcc, Liu Shuguang, Liu Jun, Liu Yonghua, Wang Fan Sep 2023

Optimization Of Bridge Life Cycle Maintenance Decision Based On Lca And Lcc, Liu Shuguang, Liu Jun, Liu Yonghua, Wang Fan

Journal of China & Foreign Highway

To study the optimal maintenance strategy for bridges over the whole life cycle under the influence of life cycle environment and life cycle cost, this paper built a multi-objective optimization model for bridge life cycle maintenance decision by adopting preventive maintenance and substantial maintenance as the basic maintenance methods, and bridge reliability, life cycle environment and life cycle cost as the objective functions. Additionally, it derived the quantification method of indicators including the time-varying reliability, life cycle environment and life cycle cost indicators of the bridge, and determined the computational process of bridge life cycle maintenance decision optimization based on …

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Study On Long-Lasting Anticorrosive Primer For Steel Deck Paveme Nt In Marin E Environment, Yan Dongbo, Zhuang Yongyi, Liu Yan, Chen Zhenfu, Ceng Deliang Sep 2023

Study On Long-Lasting Anticorrosive Primer For Steel Deck Paveme Nt In Marin E Environment, Yan Dongbo, Zhuang Yongyi, Liu Yan, Chen Zhenfu, Ceng Deliang

Journal of China & Foreign Highway

In steel deck pavement, after the occurrence of local diseases, steel plates are prone to rapid rust to exacerbate the disease development. To this end, based on the waterproof adhesive system of polymethyl methacrylate resin for steel deck pavement under the marine environment, this paper adopted the organosilicone-modified epoxy resin as the main raw material, which was combined with the cashew phenol-modified phenolic amine and polyamide mixed curing agent. Meanwhile, this paper added a new type of environmentally friendly rust prevention pigment to produce the long-lasting anticorrosive primer for steel deck pavement. The technical requirements of the long-lasting anticorrosive primer …

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Research On Structural Design Of Steel-Uhpc Light Composite Beam Of Large-Span Self-Anchored Suspension Bridge, Zhang Xin, Li Yu, Liu Yong Sep 2023

Research On Structural Design Of Steel-Uhpc Light Composite Beam Of Large-Span Self-Anchored Suspension Bridge, Zhang Xin, Li Yu, Liu Yong

Journal of China & Foreign Highway

To optimize the structural scheme of steel-ultra-high performance concrete (steel-UHPC) light composite stiffening beams for large-span self-anchored suspension bridges, by taking the Qinglongzhou Bridge in Yiyang as the research object, this paper employed finite element simulation and full-scale tests to compare and verify three steel-UHPC composite stiffening beam schemes, and compare the indicators such as static behavior and economic properties. The results show that the UHPC stiffened girder is the best choice for the structural performance and economic characteristics. The results show that the UHPC waferboard, UHPC longitudinal rib plate without web reinforcement, UHPC longitudinal rib plate with long bolts …

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Key Technology Of Demolition And Reconstruction Design Of Wudou Bridge, Li Huaqiang Sep 2023

Key Technology Of Demolition And Reconstruction Design Of Wudou Bridge, Li Huaqiang

Journal of China & Foreign Highway

Bridges constructed between the 1960s and 1970s have been damaged to different degrees during operation due to excessive traffic flow and severe overloading of vehicles, and thus cannot meet the requirements for safe passage of vehicles and navigation. Therefore, they need to be demolished and rebuilt. To safely, economically and efficiently demolish the old bridges and rebuild them in-situ, this paper studied a design concept of integrated construction and demolition. Based on the Wudou Bridge demolition and reconstruction project in Foshan, the combination of theoretical analysis and computational simulation was utilized to conduct a multi-scheme study from the perspectives of …

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Analysis Of Internal Force And Deformation Of Double-Row Steel Sheet Pile Cofferdam In Different Working Conditions, Yang Qin, Fang Zhongqiang, Liu Yi, Tu Qiliang Sep 2023

Analysis Of Internal Force And Deformation Of Double-Row Steel Sheet Pile Cofferdam In Different Working Conditions, Yang Qin, Fang Zhongqiang, Liu Yi, Tu Qiliang

Journal of China & Foreign Highway

To understand the internal force and deformation generation mechanism of the double-row steel sheet pile cofferdam in complex stress conditions and determine the most unfavorable working condition, this paper adopted the finite element method to analyze the displacement, axial force of steel tie bars and bending moments of steel sheet piles in various construction stages at different water levels and under different load types. The study shows that the deformation and internal force of the cofferdam are affected by the water level, fill light weight, vertical construction load, horizontal wave load, and wind load. The most unfavorable conditions for displacement …

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Design Of Prefabricated Deep-Water Combined Steel Sheet Pile Cofferdam, Fu Su, Ceng Jian, Yang Suhai, Wang Chao, Deng Songtao Sep 2023

Design Of Prefabricated Deep-Water Combined Steel Sheet Pile Cofferdam, Fu Su, Ceng Jian, Yang Suhai, Wang Chao, Deng Songtao

Journal of China & Foreign Highway

By taking the pier bearing platform 9# of the non-navigable bridge in the eastern flood-relief area of Shenzhen-Zhongshan Link as the research project, this paper introduced the cofferdam structure of prefabricated combined steel sheet piles using the support-first construction process from the aspects of the cofferdam structural form, cross-section type of steel sheet piles, construction process, and support system, and adopted the finite element method to numerically analyze the whole cofferdam construction process. The combined cross-section of cap-shaped steel sheet piles and H-shaped steel greatly improves the rigidity of steel sheet piles. Additionally, the construction process of the support-first method …

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Performance Analysis Of Steel Bridge Deck Reinforced By Uhpc Based On Fracture Mechanics, Long Yiyu, Chen Shuangqing, Tang Chunyan, Peng Yajun, Zhou Zejian Sep 2023

Performance Analysis Of Steel Bridge Deck Reinforced By Uhpc Based On Fracture Mechanics, Long Yiyu, Chen Shuangqing, Tang Chunyan, Peng Yajun, Zhou Zejian

Journal of China & Foreign Highway

At the deck-rib welding joints of orthotropic steel bridge decks, cracking can easily occur under the vehicle load, and the fatigue risk of steel bridge decks can be effectively reduced by UHPC reinforcement. To investigate the effect of UHPC-reinforced steel bridge decks, this paper carried out finite element analysis based on linear-elastic fracture mechanics. By taking the orthotropic steel bridge deck test as the reference, the fatigue performance at the weld toe was calculated, and the reliability of the finite element model was verified. Stress intensity factor calculation analysis was performed by inserting an initial crack at the weld detail, …

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Stress Analysis And Monitoring Of Composite Cable Hanging Basket During Construction, Zhou Su, Li Xinsheng, Liu Chentao, Shao Mingjie Sep 2023

Stress Analysis And Monitoring Of Composite Cable Hanging Basket During Construction, Zhou Su, Li Xinsheng, Liu Chentao, Shao Mingjie

Journal of China & Foreign Highway

Composite cable hanging baskets are also known as front and rear pivot combined hanging baskets. By taking the construction monitoring of a single-tower and double plane cable-stayed bridge as the research project, this paper demonstrated the rationality, practicability and advancement of the composite cable hanging baskets during construction, and carried out modeling analysis of the whole construction stage. Meanwhile, the batch tension values of the construction sections were determined according to the deformation of the hanging basket during the construction stage, and then the theoretical and measured values of the basket’s deformation and stress during the construction stage were analyzed …

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Study On Influence Of Overcrossing Construction Of Xingquan Railway Lyugu No .2 Tunnel To Existing Chenba Tunnel Of Fuxia Railway, Fan Dequan Sep 2023

Study On Influence Of Overcrossing Construction Of Xingquan Railway Lyugu No .2 Tunnel To Existing Chenba Tunnel Of Fuxia Railway, Fan Dequan

Journal of China & Foreign Highway

To study the influence of tunnel crossing construction on the existing tunnel structures, this paper took the overcrossing construction of the existing Chenba tunnel of Fuxia railway of Xingquan railway Lyugu No. 2 tunnel as the research project. By adopting the numerical simulation method of finite element, it studied the change rules of the displacement field and stress field of the existing tunnels affected by the overcrossing construction of the new tunnels. The results show that the influencing range subject to the effect of Lyugu No. 2 tunnel’s excavation on the existing Chenba tunnel is roughly within the range of …

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Research On Performance Simulation Of Previous Concrete Considering Characteristics Of Void Structures, Zheng Shuai, Dan Jingsong, Han Weiwei, Lv Yigang, He Jie, Pei Fucai Sep 2023

Research On Performance Simulation Of Previous Concrete Considering Characteristics Of Void Structures, Zheng Shuai, Dan Jingsong, Han Weiwei, Lv Yigang, He Jie, Pei Fucai

Journal of China & Foreign Highway

Pervious concrete contains a large number of macroscopic voids. To analyze the influence of the void structures on the mechanical properties of pervious concrete, this paper adopted the random void method to build a simulation model of pervious concrete, and study the effect of the characteristics of the void structures on the force properties. Firstly, two kinds of pervious concrete specimens with two void content levels were made indoor, and then the specimens were cut after curing and molding. Next, image enhancement and threshold segmentation were conducted on the section images of the cut surfaces, and two-dimensional digital images of …

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Study On Frost Resistance And Pore Structure Of Nano-Sio 2 Modified Pavement Concrete Under Fatigue Load, Zhou Xuexiang, Zheng Wenshi, Wu Cong Sep 2023

Study On Frost Resistance And Pore Structure Of Nano-Sio 2 Modified Pavement Concrete Under Fatigue Load, Zhou Xuexiang, Zheng Wenshi, Wu Cong

Journal of China & Foreign Highway

To improve the frost resistance of concrete pavement under fatigue load, this paper simulated the freeze-thaw damage of concrete pavement under vehicle load by indoor fatigue loading and alternating freeze-thaw cycling test. Meanwhile, it designed the bending tensile test to test the residual bending tensile strength of nano SiO2-modified pavement concrete after freezing and thawing, and adopted the mercury injection method to test the microscopic pore structures of concrete. Additionally, by employing the electron microscope, the change rules of pores in the concrete under the action of fatigue load were observed, and the effect of nano SiO2 dosage, the number …

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Influence Of Natural Environment On The Serviceability Of Emulsified Asphalt Cold Recycled Mixture, Yang Puxin Sep 2023

Influence Of Natural Environment On The Serviceability Of Emulsified Asphalt Cold Recycled Mixture, Yang Puxin

Journal of China & Foreign Highway

To improve the early serviceability of emulsified asphalt cold recycled mixtures, this paper studied the effect of curing conditions on the mechanical strength and stability of emulsified asphalt cold recycled mixtures by conducting indoor tests. The results show that in the same test conditions, the indoor emulsified asphalt cold recycled mixture can better characterize the serviceability of practical projects. Compared to the indoor specimen mixture, the stability and cleavage strength of field mixture core samples are increased by an average of 5.5% and 10.7% respectively. Under the curing time of no less than 7 d, the stability, cleavage strength and …

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Experimental Study On Recycled Brick Powder Foam Concrete Based On Slurry Substitution Method, Liao Shixian, Huang Lei Sep 2023

Experimental Study On Recycled Brick Powder Foam Concrete Based On Slurry Substitution Method, Liao Shixian, Huang Lei

Journal of China & Foreign Highway

Foam concrete is a kind of porous lightweight building material characterized by sound insulation and noise reduction, heat insulation and fire resistance, heat preservation and frost resistance. However, it has defects such as low strength, high porosity and poor integrity, thus limiting its wide application in the field of building materials. Recycled brick powder can be prepared from construction waste of clay bricks and has certain volcanic ash activity. Meanwhile, the mechanical properties of foam concrete can be improved by employing waste bricks as an admixture in cement-based composite materials. In view of the problems of the cement substitution method, …

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Study On Mix Design And Performance Of Permeable Concrete Considering Sand Ratio And Aggregate To Binder Ratio, Wei Yazhou, Ji Rongqing Sep 2023

Study On Mix Design And Performance Of Permeable Concrete Considering Sand Ratio And Aggregate To Binder Ratio, Wei Yazhou, Ji Rongqing

Journal of China & Foreign Highway

Considering the effect of the sand ratio and aggregate to binder ratio, this paper improved the traditional mix ratio design method-volumetric method, and investigated the influence of the sand ratio, aggregate to binder ratio, and maintenance method on the mechanical properties and permeability coefficient of pervious concrete based on the improved method. The results show that under the sand ratio of 15%, the compressive strength of concrete is significantly increased and the permeability is not affected. When the aggregate to binder ratio is 3.0‒3.1, the compressive strength and permeability coefficient of the concrete can be both considered. Additionally, compared to …

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Experimental Study On Mechanical Properties Of Steel-Polypropylene Mixed Fiber Rubber Concrete, Qiu Jiandong Sep 2023

Experimental Study On Mechanical Properties Of Steel-Polypropylene Mixed Fiber Rubber Concrete, Qiu Jiandong

Journal of China & Foreign Highway

Waste rubber materials can be recycled to obtain rubber aggregates, which can be employed in cement concrete products. This paper carried out mechanical performance tests on ordinary concrete and rubber concrete (rubber substitution rate of 20%) with different fiber combinations (doped MS, co-doped PP, and mixed MS-PP), and mainly examined the slump, density, compressive strength, modulus of elasticity, split tensile strength, and rupture strength of the concrete. The results show that the relevant performance indexes decrease significantly after 20% of rubber aggregate is added to the concrete. However, the mechanical performance of ordinary concrete and rubber concrete with the combination …

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Application Of Bim Forward Design In Complex Three-Dimensional Traffic Design Stage, Wang Bo, Zhu Xinghu, Pei Wangjian, Ge Puta Sep 2023

Application Of Bim Forward Design In Complex Three-Dimensional Traffic Design Stage, Wang Bo, Zhu Xinghu, Pei Wangjian, Ge Puta

Journal of China & Foreign Highway

To improve the accuracy and efficiency of complex three-dimensional traffic design, and provide basic digital data for the whole life cycle, this paper researched and investigated the application of BIM technology in the complex three-dimensional traffic design stage by taking the convergence project of the Qianhai section of Shenzhen Coastal Expressway and Nanping Expressway in Guangdong as a case study. Meanwhile, it put forward the BIM forward design schemes for the fields of roads, bridges, and tunnels, carried out secondary development, and built the three-dimensional parametric model, with the design results optimized. Additionally, design analysis and application were conducted to …

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Research On Interchange Reconstruction Design Of Minxiao Hub, Hu Tian, Tan Ximing, Yi Xuebin, Wei Hui Sep 2023

Research On Interchange Reconstruction Design Of Minxiao Hub, Hu Tian, Tan Ximing, Yi Xuebin, Wei Hui

Journal of China & Foreign Highway

Based on the design of the Minxiao hub interchange, this paper analyzed the technical problems of frequent traffic accidents after the initial reconstruction of Minxiao hub interchange, and put forward corresponding reconstruction suggestions. In the interchange design details, the design points about the dual lanes adopting single lanes and speed change lanes only put forward the distance requirement of 60 m for the transition sections, but whether the gradual changes of the travel lanes and hard shoulders are completed in the same road section or not is not clarified. The initial reconstruction of Minxiao hub interchange is designed to complete …

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Exploring Long-Term Protective Effect Of High Vertical Sand Barrier On Top Of Complex Longitudinal Sand Ridge In Taklamakan Desert, Jin Changning Sep 2023

Exploring Long-Term Protective Effect Of High Vertical Sand Barrier On Top Of Complex Longitudinal Sand Ridge In Taklamakan Desert, Jin Changning

Journal of China & Foreign Highway

By taking the high vertical sand barriers deployed on the top of the complex longitudinal sand ridges in the hinterland of Taklamakan Desert as the object, this paper investigated the sand protection effect from the long-term perspective on the basis of several years’ comparative observation. The result analysis shows that in addition to the recognized sand blocking effect, high vertical sand barriers also have a more important role of sand fixation, which means that the barriers can change the original overall movement of sand dunes into only the falling sand slope forward, with the windward slopes basically fixed. Even if …

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Study And Implementation Of Jacking Scheme Of Vertical Curve Beam With Two -Way Longitudinal Slope Without Adjusting Temporary Pier Top Elevation, Zhang Hongwu, Ke Hongjun, Chen Zhuoyi, Yang Wu Sep 2023

Study And Implementation Of Jacking Scheme Of Vertical Curve Beam With Two -Way Longitudinal Slope Without Adjusting Temporary Pier Top Elevation, Zhang Hongwu, Ke Hongjun, Chen Zhuoyi, Yang Wu

Journal of China & Foreign Highway

The bridge alignment design is the straight line+circular curve+straight two-way longitudinal slope vertical curve variable curvature steel bridge jacking. To deal with this problem, this paper analyzed the shortcomings of existing schemes such as real-time or multiple adjustments to the temporary pier top elevation, and proposed a jacking scheme of taking full advantage of the steel bridge’s characteristics including small flexural rigidity, strong adaptive deformation ability and high material strength, without adjusting the temporary pier top elevation. Additionally, the whole-process finite element simulation analysis was conducted on this scheme via a background project, with the calculation results revealing safety and …

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Data Analysis And Early Warning Platform For Bridge Health Monitoring Based On Matlab-Java Fusion, Wang Zhiwen, Mao Yongjia, Ding Youliang Sep 2023

Data Analysis And Early Warning Platform For Bridge Health Monitoring Based On Matlab-Java Fusion, Wang Zhiwen, Mao Yongjia, Ding Youliang

Journal of China & Foreign Highway

Bridge health monitoring provides important support for daily operation and maintenance management of bridges. Meanwhile, real-time analysis, evaluation and early warning of bridge health monitoring data are the core requirements for enhancing bridge monitoring and safety protection, which can help grasp the operation status of bridge structures in real time and guard against major safety risks of bridge operation. This paper combined traditional signal processing and statistical analysis with modern machine learning and deep learning, and developed a platform for real-time analysis and warning of bridge health monitoring data based on Matlab-JAVA integration. Online cleaning, feature extraction, performance evaluation and …

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Application Of Dry Sbs Modification Technology In Yanhai Highway, Zhang Han, Meng Chunlin, Zhao Mingfang, Lu Chuanzhong, Ji Guoqi Sep 2023

Application Of Dry Sbs Modification Technology In Yanhai Highway, Zhang Han, Meng Chunlin, Zhao Mingfang, Lu Chuanzhong, Ji Guoqi

Journal of China & Foreign Highway

Dry SBS-modified asphalt pavement technology is to produce SBS-modified asphalt mixtures by adding specific SBS modifiers, which aims to solve the performance degradation of SBS-modified asphalt in transportation and storage. By relying on the coastal highway repair projects, this paper compared the effects of different dry SBS mixing contents on the test results by the indoor dry SBS and matrix asphalt compatibility test and asphalt mixture performance evaluation test. Meanwhile, based on the test results, the recommended dry SBS mixing content for the coastal highway upper layer milling and resurfacing maintenance project was proposed and applied on a large scale …

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The Role Of Leading-Edge Serrations In Controlling The Flow Over Owls’ Wing, Tanner Saussaman, Asif Nafi, David Charland, Hadar Ben-Gida, Roi Gurka Sep 2023

The Role Of Leading-Edge Serrations In Controlling The Flow Over Owls’ Wing, Tanner Saussaman, Asif Nafi, David Charland, Hadar Ben-Gida, Roi Gurka

Physics and Engineering Science

We studied the effects of leading-edge serrations on the flow dynamics developed over an owl wing model. Owls are predatory birds. Most owl species are nocturnal, with some active during the day. The nocturnal ones feature stealth capabilities that are partially attributed to their wing microfeatures. One of these microfeatures is small rigid combs (i.e. serrations) aligned at an angle with respect to the incoming flow located at the wings' leading-edge region of the primaries. These serrations are essentially passive flow control devices that enhance some of the owls' flight characteristics, such as aeroacoustics and, potentially, aerodynamics. We performed a …

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Graphite And Dispersant Additives For Battery Paste Compositions, Fatih Dogan, Julian Kosacki Sep 2023

Graphite And Dispersant Additives For Battery Paste Compositions, Fatih Dogan, Julian Kosacki

Materials Science and Engineering Faculty Research & Creative Works

Various graphite additives were incorporated into the positive battery paste composition to compare their effects on the positive active mass utilization of lead-acid batteries. The disclosure is related to battery paste composition for preparing a lead-acid battery plate comprising a graphite additive selected from the group consisting of globular natural graphite, natural flake graphite, expanded flake graphite, and combinations thereof. The disclosure is also related to a battery paste composition comprising a sodium polymethacrylate dispersant. The disclosure is further related to batteries prepared by these battery paste compositions.

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Carbohydrates Generated Via Hot Water As Catalyst For Co2 Reduction Reaction, Yang Yang, Heng Zhong, Jiong Cheng, Yun Hang Hu, Richard Lee Smith Jr, Fangming Jin Sep 2023

Carbohydrates Generated Via Hot Water As Catalyst For Co2 Reduction Reaction, Yang Yang, Heng Zhong, Jiong Cheng, Yun Hang Hu, Richard Lee Smith Jr, Fangming Jin

Michigan Tech Publications

Combining terrestrial biomass with submarine-type hydrothermal environments for CO2 reduction is a possible approach for realizing new energies while achieving sustainable circulation of carbon. Herein, carbohydrateenabled CO2 reduction based on NaHCO3 conversion to formate revealed that hydrothermal environments facilitated direct hydrogen transfer from carbohydrates (glucose, cellulose) to CO2/NaHCO3 with hot water (250–300 °C, 5–20 MPa) acting as homogeneous catalyst in absence of any conventional catalysts giving CO2/ NaHCO3 reduction efficiencies as high as 76% for cellulose. Time-resolved operando hydrothermal DRIFTS spectra of glycolaldehyde in hot water (250 °C, autogenous pressure) verified that water catalyzed NaHCO3 reduction by converting the -CHO …

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Membrane Functionalization Approaches Toward Per- And Polyfluoroalkyl Substances And Selected Metal Ion Separations, Francisco Cecil Léniz-Pizarro, Holly E. Rudel, Nicolas J. Briot, Julie B. Zimmerman, Dibakar Bhattacharyya Sep 2023

Membrane Functionalization Approaches Toward Per- And Polyfluoroalkyl Substances And Selected Metal Ion Separations, Francisco Cecil Léniz-Pizarro, Holly E. Rudel, Nicolas J. Briot, Julie B. Zimmerman, Dibakar Bhattacharyya

UK CARES Faculty Publications

Adsorption and ion exchange technologies are two of the most widely used approaches to separate pollutants from water; however, their intrinsic diffusion limitations continue to be a challenge. Pore functionalized membranes are a promising technology that can help overcome these challenges, but the extents of their competitive benefits and broad applicability have not been systematically evaluated. Herein, three types of adsorptive/ion exchange (IX) polymers containing strong/weak acid, strong base, and iron-chitosan complex groups were synthesized in the pores and partially on the surface of microfiltration (MF) membranes and tested for the removal of organic and inorganic cations and anions from …

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Construction And Performance Optimization Of Bioconjugated Nanosensors For Early Detection Of Breast Cancer And Pro-Inflammatory Diseases, Pooja Gaikwad Sep 2023

Construction And Performance Optimization Of Bioconjugated Nanosensors For Early Detection Of Breast Cancer And Pro-Inflammatory Diseases, Pooja Gaikwad

Dissertations, Theses, and Capstone Projects

In recent years, nanosensors have emerged as a tool with strong potential in medical diagnostics. Single-walled carbon nanotube (SWCNT) based optical nanosensors have notably garnered interest due to the unique characteristics of their near-infrared fluorescence emission, including tissue transparency, photostability, and various chiralities with discrete absorption and fluorescence emission bands. Additionally, the optoelectronic properties of SWCNT are sensitive to the surrounding environment, which makes them suitable for in vitro and in vivo biosensing. Single-stranded (ss) DNA-wrapped SWCNTs have been reported as optical nanosensors for cancers and metabolic diseases. Breast cancer and cardiovascular diseases are the most common causes of death …

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Establishing Physical And Chemical Mechanisms Of Polymerization And Pyrolysis Of Phenolic Resins For Carbon-Carbon Composites, Ivan Gallegos, Josh Kemppainen, Jacob R. Gissinger, Malgorzata Kowalik, Adri Van Duin, Kristopher E. Wise, S. Gowtham, Gregory Odegard Sep 2023

Establishing Physical And Chemical Mechanisms Of Polymerization And Pyrolysis Of Phenolic Resins For Carbon-Carbon Composites, Ivan Gallegos, Josh Kemppainen, Jacob R. Gissinger, Malgorzata Kowalik, Adri Van Duin, Kristopher E. Wise, S. Gowtham, Gregory Odegard

Michigan Tech Publications

The complex structural and chemical changes that occur during polymerization and pyrolysis critically affect material properties but are difficult to characterize in situ. This work presents a novel, experimentally validated methodology for modeling the complete polymerization and pyrolysis processes for phenolic resin using reactive molecular dynamics. The polymerization simulations produced polymerized structures with mass densities of 1.24 ± 0.01 g/cm3 and Young's moduli of 3.50 ± 0.64 GPa, which are in good agreement with experimental values. The structural properties of the subsequently pyrolyzed structures were also found to be in good agreement with experimental X-ray data for the phenolic-derived carbon …

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