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• Channel-graph regularized correlation filter for visual object tracking  Tyagi, Arjun ; Subramanyam, A V (Advisor) ( IIIT-Delhi , 2020-07-01 ) Correlation filter (CF) based tracker often disregard or weakly incorporate the importance of feature channels as well as channel similarity. To address this, we propose a channel-graph regularization correlation filter-based ...
• Sinkhorn attacks  Chaudhuri, Dibyendu Roy ; Subramanyam, A V (Advisor) ( IIIT-Delhi , 2021-07-01 ) Adversarial attacks have been extensively investigated in the recent past. Quite interestingly, a majority of these attacks primarily work in the lp space. In this work, we propose a novel approach for generating adversarial ...
• Disentangling reconstruction network for unsupervised cross-domain person Re-Identification  Jain, Harsh Kumar ; Subramanyam, A V (Advisor) ( IIIT-Delhi , 2020-06-01 ) Unsupervised cross-domain Person Re-Identi cation (Re-ID) severely su ers from the domain gap. While di erent works address this issue, bridging domain gap with high-level representation is hard as it comprises of entangled ...
• Implementing ChaCha-based crppto primitives on programmable smartNICs  Kottur, Shaguftha Zuveria ; Shah, Rinku (Advisor) ; Tammana, Praveen (Advisor) ; Kadiyala, Krishna (Advisor) ( IIIT-Delhi , 2023-05 ) Control and management plane applications such as serverless function orchestration and 4G/5G control plane functions are offloaded to smartNICs to reduce communication and processing latency. Such applications involve ...
• Enabling rapid prototyping of tangible augmented reality experiences  Monteiro, Kyzyl John ; Parnami, Aman (Advisor) ( IIIT-Delhi , 2023-05 ) We introduce Teachable Reality, an augmented reality (AR) prototyping tool for creating interactive tangible AR applications with arbitrary everyday objects. Teachable Reality leverages vision-based interactive machine ...
• Computational creativity: artificial intelligence models for the generation and classification of affective artwork and their human evaluation  Raj, Yash ; Bagler, Ganesh (Advisor) ( IIIT-Delhi , 2023-06 ) Visual artwork is among the most salient forms of human expression. From prehistoric cave paintings to Renaissance and modern art, paintings have been a powerful medium for expressing emotions. With the advent of computing ...
• Extreme abstractive text summarization  Simran ; Chakraborty, Tanmoy (Advisor) ; Akhtar, Md. Shad (Advisor) ( IIIT-Delhi , 2022-12 ) Extreme Abstractive Summarization of long scientific papers requires domain knowledge and a concise summary maintaining faithfulness to the source and covering novel aspects presented in the paper. Human annotations are ...
• Federated learning for commercial image sources  Jain, Shreyansh ; Jerripothula, Koteswar Rao (Advisor) ( IIIT-Delhi , 2023-05 ) With the growing awareness regarding user privacy and the demand for transparency, traditional distributed machine learning algorithms are becoming taboo that uses the user’s data without any restriction or privacy. The ...
• Sarcasm explanation in multimodal dialogues  Vaibhav, Shashwat ; Akhtar, Md. Shad (Advisor) ( IIIT-Delhi , 2022-12 ) Sarcasm is a means to convey ridicule or contempt. There has been a plethora of work in sentiment analysis, of which sarcasm is one of the most challenging tasks due to the incongruity between the surface level and the ...
• Policy document summarization with controlled abstractive techniques  Fazili, Sehban ; Akhtar, Md. Shad (Advisor) ( IIIT-Delhi , 2023-05 ) Privacy policies are often lengthy and complex, hindering individual’s ability to make informed decisions about their data privacy. Abstractive summarization techniques can improve accessibility and transparency, but there ...
• Few quantum cryptanalysis techniques  Saha, Sanchita ; Bera, Debajyoti (Advisor) ( IIIT-Delhi , 2023-05 ) Quantum algorithms like Shor’s and Grover’s algorithms have proven to break several cryptographic schemes theoretically. Shor’s algorithm, which can factor numbers exponentially faster than classical computers, can break ...
• Microservice-based in-network AES solution for FPGA NICs  Hussain, Lasani ( IIIT-Delhi , 2022-12 ) Data centers demand high throughput (100 to 400 Gbps) and sub-millisecond latency. The performance of data center applications heavily depends on the efficiency of the underlying TCP stack. Despite several optimizations, ...
• Harmful meme diffusion  Vigneshwar, Palani ; Akhtar, Md. Shad (Advisor) ; Chakraborty, Tanmoy (Advisor) ( IIIT-Delhi , 2023-05 ) With the widespread use of social media platforms, virality has become a fascinating subject for researchers. Content-based research emphasizes the role of content characteristics in predicting virality, such as the type ...
• Multimodal sarcasm explanation and target generation  S, Giridhar ; Akhtar, Md. Shad (Advisor) ( IIIT-Delhi , 2023-05 ) Sarcasm is a nuanced and context-dependent communication that poses a significant challenge for natural language processing (NLP) systems. This study proposes a novel approach to improving sarcasm understanding by generating ...
• Knowledge graph assisted extreme summarization of scientific documents in hyperbolic space  Mukherjee, Asmita ; Chakraborty, Tanmoy (Advisor) ; Akhtar, Md. Shad (Advisor) ( IIIT-Delhi , 2022-12 ) A research paper is a document that presents an original work and introduces new concepts and makes interconnections between them via arguments and statements. Extreme Summarization involves high compression of the information ...
• Unsupervised meta generative object re-identification  Giri, Biman ; Subramanyam, A V (Advisor) ( IIIT-Delhi , 2022-05 ) Unsupervised domain adaptation severely suffers from huge domain gap in fine grained recognition tasks such as vehicle re-identification (re-id). Existing works either focus on fully unsupervised methods using tracklet or ...
• An evaluation of multi-user OFDMA performance in WiFi 6 and its optimization for deadline constrained settings  Dev, Harshal ; Maity, Mukulika (Advisor) ; Bhattacharya, Arani (Advisor) ( IIIT-Delhi , 2021-12 ) IEEE 802.11ax, popularly known as WiFi 6, introduces OFDMA (Orthogonal Frequency Division Multiple Access) that allows multiple users to transmit or receive frames concurrently via a more flexible utilization of the available ...
• Scalable spatio-temporal arrival time estimation for public transit  Dhingra, Karan ; Biyani, Pravesh (Advisor) ( IIIT-Delhi , 2021-09 ) The problem of the ETA prediction of public transit has an essential role in improving the rider’s experience. While, it is challenging to ensure the timeliness of bus, especially during the rush hours. This thesis provides ...
• On the implementation of internet censorship in India  Singh, Kartikey ; Chakravarty, Sambuddho (Advisor) ( IIIT-Delhi , 2022-07 ) In this work we highlight the evolution of Internet censorship within the largest democracy i.e., India. We first report a new form of Internet censorship i.e., mobile app blocking and describe in detail the mechanics ...
• Dolphin : a cellular voice based internet shutdown resistance system  Sharma, Rishi ; Chakravarty, Sambuddho (Advisor) ; Maity, Mukulika (Advisor) ( IIIT-Delhi , 2022-07 ) Traditional censorship revolves around blocking access to some websites (or services) over the Internet. However, recently there has been a rise in the events of an extreme form of censorship viz., deliberate Internet ...

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2024 Theses Doctoral

Bridging the Gap Between Lab Technology and Large-Scale Application: A Technological Study of Carbon Dioxide Direct Air Capture Sorbents and Direct Air Capture In-Situ Methanation Dual Function Materials

Lin, Yuanchunyu

This thesis aims to provide different aspects to make the Direct Air Capture Dual Function Materials (DAC-DFM) project more applicable in commercialization and large-scale deployment to directly address the global warming problem caused by anthropogenic CO₂. Dual function materials are comprised of nano dispersed alkaline sorbents and a methanation catalyst to capture CO₂ from ambient air and convert it to CH₄ upon the addition of green H₂. Two sub-projects named “Ru thrifting project” and “hydrophobicity/surface modification project” were performed to study the potential optimization and tradeoff when modifying the DFM components. The major accomplishment in this thesis has been the thrifting of Ru from its original value of 5% to 1% and finally 0.25% with no sacrifice in stability but with some decrease in capacity for CO₂ capture and methanation. Given the Ru unit price (around 14 USD/g, flexible market, in March 2024), this approach would greatly reduce the overall production cost. In the hydrophobicity/surface modification project, Al₂O₃ the high surface area carrier for the DFM components, was treated using 3 different methods (high temperature calcination, acid treatment, and metal oxide doping). The goal of this study was to reduce the surface water uptake in the Al₂O₃ from humidity, present in ambient air, by increasing hydrophobicity to reduce the energy evaporation cost during temperature swing in the DFM CO₂ desorption/methanation process. Samples treated after these 3 methods showed a significant decrease in water uptake. ZrO₂ doped Na₂CO₃-Al₂O₃ sample showed a low H₂O uptake and the highest CO₂ adsorption, twice that of the CO₂ capacity of the Na₂CO₃-Al₂O₃ samples treated by calcination and acid. Such hydrophobicity study would be used to further optimize the components of DFM to meet requirements in real world applications. Future outlook for DFMs is also briefly discussed with focuses on (1) using pre-heated H₂ to increase the temperature of inner DFM coatings for increased energy efficiency, (2) increased CO₂ capture, utilization, and conversion to CH₄, as well as (3) practical acceptance of DAC hubs and CO₂ taxes/credits. A new approach of moisture swing DAC sorbents as an alternate technology to the thermal swing DFM is suggested as a future project. With loaded CO₃²⁻ on both organic ion exchange particles/membranes and inorganic silica-based granules, the CO₂ adsorption/desorption effect can be controlled by the moisture level (relative humidity) from ambient air in the inlet sample chamber.

• Environmental engineering
• Carbon dioxide
• Carbon dioxide--Absorption and adsorption
• Carbon sequestration
• Carbon dioxide mitigation
• Zirconium oxide

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