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Relevant bibliographies by topics / Pore tuning

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Academic literature on the topic 'Pore tuning'

Author: Grafiati

Published: 5 June 2025

Last updated: 15 July 2025

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Journal articles on the topic "Pore tuning"

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Guo, Jiangtao, Weizhong Zeng, and Youxing Jiang. "Tuning the Ion Selectivity of Two-Pore Channels." Biophysical Journal 112, no. 3 (2017): 242a. http://dx.doi.org/10.1016/j.bpj.2016.11.1326.

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Neouze Gauthey, Marie-Alexandra, Marco Litschauer, Michael Puchberger, Martin Kronstein, and Herwig Peterlik. "Tuning the Pore Size in Ionic Nanoparticle Networks." Journal of Nanoparticles 2013 (March 11, 2013): 1–9. http://dx.doi.org/10.1155/2013/682945.

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Highly promising hybrid materials consisting of silica, titania, or zirconia nanoparticles linked with ionic liquid-like imidazolium units have been developed. The nanoparticle networks are prepared by click-chemistry-like process through a nucleophilic substitution reaction. The type of metal oxide nanoparticles appears to play a key role regarding the pore size of the hybrid material.

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Guo, Jiangtao, Weizhong Zeng, and Youxing Jiang. "Tuning the ion selectivity of two-pore channels." Proceedings of the National Academy of Sciences 114, no. 5 (2017): 1009–14. http://dx.doi.org/10.1073/pnas.1616191114.

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Organellar two-pore channels (TPCs) contain two copies of aShaker-like six-transmembrane (6-TM) domain in each subunit and are ubiquitously expressed in plants and animals. Interestingly, plant and animal TPCs share high sequence similarity in the filter region, yet exhibit drastically different ion selectivity. Plant TPC1 functions as a nonselective cation channel on the vacuole membrane, whereas mammalian TPC channels have been shown to be endo/lysosomal Na+-selective or Ca2+-release channels. In this study, we performed systematic characterization of the ion selectivity of TPC1 fromArabidopsis thaliana(AtTPC1) and compared its selectivity with the selectivity of human TPC2 (HsTPC2). We demonstrate that AtTPC1 is selective for Ca2+over Na+, but nonselective among monovalent cations (Li+, Na+, and K+). Our results also confirm that HsTPC2 is a Na+-selective channel activated by phosphatidylinositol 3,5-bisphosphate. Guided by our recent structure of AtTPC1, we converted AtTPC1 to a Na+-selective channel by mimicking the selectivity filter of HsTPC2 and identified key residues in the TPC filters that differentiate the selectivity between AtTPC1 and HsTPC2. Furthermore, the structure of the Na+-selective AtTPC1 mutant elucidates the structural basis for Na+selectivity in mammalian TPCs.

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Qian, Lei, Adham Ahmed, Alison Foster, Steve P. Rannard, Andrew I. Cooper, and Haifei Zhang. "Systematic tuning of pore morphologies and pore volumes in macroporous materials by freezing." Journal of Materials Chemistry 19, no. 29 (2009): 5212. http://dx.doi.org/10.1039/b903461g.

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Xie, Beibei, Xiaodan Ren, Xiaobing Yan, et al. "Fabrication of pore-rich nitrogen-doped graphene aerogel." RSC Advances 6, no. 27 (2016): 23012–15. http://dx.doi.org/10.1039/c6ra02049f.

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Porosity tuning of NGAs by tailoring GONSs yields the pore-richest NGA with the best mechanical stability and electrocatalytic biosensing activity using the smallest sonicated GONSs and DA with high N content and 3D crosslinking capability.

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Herling, Markus M., Ulrike Lacher, Martin Rieß, et al. "Sub-micron pore size tailoring for efficient chiral discrimination." Chemical Communications 53, no. 6 (2017): 1072–75. http://dx.doi.org/10.1039/c6cc09484h.

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Guo, Cong, Mou Zheng Liu, and Wen Zhi Li. "Tuning the Pore Size of Monodisperse SBA-15 Spheres." Advanced Materials Research 1120-1121 (July 2015): 183–87. http://dx.doi.org/10.4028/www.scientific.net/amr.1120-1121.183.

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A flexible, controllable and facile synthesis route was presented in the synthesis of spherical particles of mesoporous SBA-15 with diameter up to 28 nm, and particle diameter of 3-5 µm. The structures and morphology of these materials were characterized by powder X-ray diffraction (XRD), nitrogen adsorption analysis and scanning electron micrographs (SEM). The relationship between the porous property of silica and the weight ratio of starch to TMB were discussed. It indicates that the weight ratio of starch to TMB have a significant effect on the pore size, the surface area and also contribute to a narrow pore size distribution.

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Teo, Nicholas, and Sadhan C. Jana. "Solvent Effects on Tuning Pore Structures in Polyimide Aerogels." Langmuir 34, no. 29 (2018): 8581–90. http://dx.doi.org/10.1021/acs.langmuir.8b01513.

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Borchardt, Lars, Winfried Nickel, Mirian Casco, et al. "Illuminating solid gas storage in confined spaces – methane hydrate formation in porous model carbons." Physical Chemistry Chemical Physics 18, no. 30 (2016): 20607–14. http://dx.doi.org/10.1039/c6cp03993f.

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Wu, Lu, Zheng Jiao, Minghong Wu, Tingting Song, and Haijiao Zhang. "Formation of mesoporous silica nanoparticles with tunable pore structure as promising nanoreactor and drug delivery vehicle." RSC Advances 6, no. 16 (2016): 13303–11. http://dx.doi.org/10.1039/c5ra27422b.

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Dissertations / Theses on the topic "Pore tuning"

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Bozin, A. S. "Convergence of self-tuning systems : pole assignment and self-tuning control." Thesis, University of Manchester, 1991. https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.492069.

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Sattar, T. P. "Self-tuning control with pole-zero placement." Thesis, London South Bank University, 1986. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.379446.

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Mustafa, Mohd Marzuki bin. "Pole-assignment high order controllers and applications to adaptive control with on-line supervision." Thesis, University of Salford, 1989. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.258358.

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Olsson, Markus. "Simulation Comparison of Auto-Tuning Methods for PID Control." Thesis, Linköping University, Department of Electrical Engineering, 2008. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-11106.

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<p>Auto-tuning has become an important function in distributed control systems (DCS) and is especially appreciated in large industries that can have hundreds of controllers. In the DCS 800xA manufactured by ABB, there is an auto-tuning method implemented based on a relay experiment to determine the ultimate gain and the ultimate period, with which the PID parameters are obtained using the modified Ziegler-Nichols tuning rules. The tuning procedure can then proceed with a step identification experiment to get additional parameters for kappa-tau tuning. In the previous DCS, called Advant, there was another auto-tuning approach implemented. This method was based on dominant pole design, which included an identification of the process. The purpose of this thesis is to compare these auto-tuning methods, to investigate if the dominant pole placement method should be migrated to the 800xA system.</p><br><p>Automatisk trimning har blivit en viktig funktion i distribuerade styrsystem (DCS och är speciellt av intresse för stora industrier som kan ha ﬂera hundra regulatorer. Den automatiska trimningen som idag är implementerad i ABB:s DCS 800xA är baserad på ett reläexperiment för att bestämma den ultimata förstärkningen och den ultimata periodtiden. Modiﬁerade Ziegler-Nichols trimningsregler används sedan för att bestämma PID parametrarna. Vidare kan trimningen fortsätta med ett stegsvars-experiment för att erhålla ytterliggare parametrar och trimma med kappa-tau metoden. Den automatiska trimningsmetoden som var implementerad i tidigare DCS, Advant, var baserad på dominant polplacering med identiﬁering av processen. Syftet med detta examensarbete är att jämföra dessa automatiska trimningsmetoder för att undersöka om den tidigare trimningsmetoden baserad på dominant polplacering ska implementeras i 800xA systemet.</p>

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Wai, Chun-sing Terence. "Implications of new airport/port development on Hong Kong housing market." Hong Kong : University of Hong Kong, 1998. http://sunzi.lib.hku.hk/hkuto/record.jsp?B21028680.

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Moalla, Asma. "The regency of Tunis and the Ottoman Porte, 1777-1814 : army and government of a North-African Ottoman eyālet at the end of the eighteenth century /." London : Routledge Curzon, 2004. http://catalogue.bnf.fr/ark:/12148/cb39242319h.

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Moalla, Asma. "The government and army of Hammuda Basha, bey of Tunis (1777-1814) A study in the administrative and political relations of an Ottoman Arab eyalet with the Porte." Thesis, SOAS, University of London, 2000. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.271404.

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Contemporary historians have almost unanimously stated that one of the main features of the political and administrative evolution of the Tunisian regency, which was part of the Ottoman empire for more than three centuries (1574- 1881), was its increasing and irreversible autonomy from the central power of the Porte in Istanbul. Against this categorical aSsertion, which has remained almost totally undisputed, the present thesis aims at stressing the province's longneglected Ottoman identity. Within the context of a study of the government and policies of l;Iainmuda Bum, bey of Tunis (1777-1814, corresponding to 1191- 1229 of the hiim), it will probe the administrative and political relationship between province and center. Two main inter-related aspects of this relationship will be investigated in particular, i.e.: how closely did the structures, sources of recruitment and organisation of the army and administration of the Regency confonn to the model represented by those of the heart of the Empire? and to what extent did· the specific policies of l;Iammuda Basm mirror the policies and concerns of the Ottoman Porte at that period ? As a related issue to this last aspect, various elements are put forward to support an important postulate of this thesis, concerning the existence of special links established between Hammuda Basha and his contemporary, Sultan Selim III, author of the first vast refonns program for the Ottoman empire at the end of the eighteenth century. The comparative approach adopted in this study has necessitated drawing upon two main types of sources: travellers' accounts, chronicles, archival documents and studies on the Regency of Tunis on the one hand, and, on the other, the extensive body of research that has been carried out on the Ottoman empire and its provinces, particularly those of the Arab Mashriq.

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Vorek, Jiří. "Knihovna stavebních prvků koaxiálního filtru pro CST Microwave Studio." Master's thesis, Vysoké učení technické v Brně. Fakulta elektrotechniky a komunikačních technologií, 2010. http://www.nusl.cz/ntk/nusl-218608.

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This thesis deals with development of tool – macros which help to create coaxial cavity filters. It describes problematic design of complex structures at CST Studio Suite 2009. For this purpose macros supporting coarse and fine model to method Tuning – Space Mapping (TSM) was made. This means creating fine model at CST MWS and coarse model at CST DS.

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Taffa, Dereje Hailu. "Post Grafting of Mesoporous TiO2 Electrodes: Host Guest Interactions and Pore Size Tuning." Doctoral thesis, 2010. https://repositorium.ub.uni-osnabrueck.de/handle/urn:nbn:de:gbv:700-201010056588.

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Nano-structured materials are widely applied for various applications like photovoltaics, electrochromics and sensors. A challenging task in all these fields is the functionalization of these materials with a molecule of interest for the desired application. This work demonstrate the post grafting of the most important and commonly used nano-structured material, mesoporous TiO2, with different bifunctional molecular linkers. These compounds basically have two functional groups, the phosphonic acid group which coordinates to the TiO2 surface and a positive and negative head group which controls the surface charge and the potential interaction of the surface with species in solution. These two groups are systematically separated by alkyl group of different chain length which controls the hydrophobicity of the surface. It is shown that the new surface modification technique simplifies the molecular requirements for functional surface modifiers considerably. Using a limited set of organic anchors with adjustable head group charge and hydrophobicity, broad range of molecules can be adsorbed onto TiO2. Different applications based on such modified surfaces were explored and demonstrated. The modified surfaces can be used to incorporate different charged guest molecules, electrochromophores and dyes which enable to probe their electrochemistry and photovoltaic properties on the surface. Supra-molecular self assembly inside the modified pores is possible which can be monitored by different methods. The study includes the prepartaion of the modified surfaces and their characterization using different electrochemical methods, FTIR spectroscopy, Quartz Crystal Microbalance, Contact angle and Scanning Electron Microscopy measurements.

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Xu, Xing-Jia, and 許倖嘉. "Auto-tuning PID controllers based on dominant pole placement." Thesis, 1993. http://ndltd.ncl.edu.tw/handle/51700140345838700044.

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碩士<br>國立成功大學<br>化學工程研究所<br>81<br>A new autotuning method based on an identification procedure under P,PI or PID feedback has been developed to tune PID controllers automatically.The process is identified as a second- order plus dead-time model,based on the peak response data extracted from a single closed-loop test. Simple algorithms for tuning P,PI,and PID controllers are proposed to meet desired specifications on dominant pole placement. Several controller-setting techniques are compared for the PI and PID control of a second-order plus dead time model under set-point and load changes. The comparison is based on ISE,IAE, ITAE,and stability robustness. Our method yields satisfactory results. The method can be applied when initial PID settings are required or the settings need to be adapted to changing conditions . A simulation study demostrates the validity and self-tuning capacity of the method for a wide variety of process dynamics.

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Books on the topic "Pore tuning"

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Davies, R. Over parametrized pole-assignment self-tuning controllers. UMIST, 1993.

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Lower, Michael. The Tunis Crusade of 1270. Oxford University Press, 2018. http://dx.doi.org/10.1093/oso/9780198744320.001.0001.

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Why did the last of the major European campaigns to reclaim Jerusalem wind up attacking Tunis, a peaceful North African port city thousands of miles from the Holy Land? In the first book-length study of the campaign in English, Michael Lower tells the story of how the classic era of crusading came to such an unexpected end. Unfolding against a backdrop of conflict and collaboration that extended from England to Inner Asia, the Tunis Crusade entangled people from every corner of the Mediterranean world. Within this expansive geographical playing field, the ambitions of four powerful Mediterranean dynasts would collide. While the slave-boy-turned-sultan Baybars of Egypt and the saint-king Louis IX of France waged a bitter battle for Syria, al-Mustansir of Tunis and Louis’s younger brother Charles of Anjou struggled for control of the Sicilian Straits. When the conflicts over Syria and Sicily became intertwined in the late 1260s, the Tunis Crusade was the shocking result. While the history of the crusades is often told only from the crusaders’ perspective, in The Tunis Crusade of 1270, Lower brings Arabic and European-language sources together to offer a panoramic view of these complex multilateral conflicts. Standing at the intersection of two established bodies of scholarship—European History and Near Eastern Studies—The Tunis Crusade of 1270, contributes to both by opening up a new conversation about the place of crusading in medieval Mediterranean culture.

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Lower, Michael. The Crusade Begins. Oxford University Press, 2018. http://dx.doi.org/10.1093/oso/9780198744320.003.0005.

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King Louis IX of France departed on the Tunis Crusade in March 1270. The campaign was beset with challenges from the outset. Louis had contracted with the Genoese for an expeditionary fleet, but they were two months late delivering the boats. Bored and drunk crusaders rioted in the streets of Aigues‐Mortes as they waited out the long delay. When the crusade did set sail, it made for Cagliari on Sardinia rather than the Near East. Shocked by their arrival, the Pisan garrison that controlled the city at first refused the crusaders entrance inside its walls. At a council of war held on the king’s warship Montjoie, the decision to divert the crusade to Tunis was announced to a stunned rank and file. A peaceful port city was about to move from the periphery to the center of the history of the crusades.

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Book chapters on the topic "Pore tuning"

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Huba, Mikuláš, and Pavol Bisták. "Quadruple Real Dominant Pole Tuning of a Filtered PID Controller." In Lecture Notes in Electrical Engineering. Springer International Publishing, 2016. http://dx.doi.org/10.1007/978-3-319-43671-5_6.

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Sikaundi, J. "Obtaining Initial Controller Parameters for Approximate Pole Placement Iterative Feedback Tuning." In Technological Developments in Education and Automation. Springer Netherlands, 2009. http://dx.doi.org/10.1007/978-90-481-3656-8_9.

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Abdullah, Rudwan, Amir Hussain, and Ali Zayed. "A New RBF Neural Network Based Non-linear Self-tuning Pole-Zero Placement Controller." In Lecture Notes in Computer Science. Springer Berlin Heidelberg, 2005. http://dx.doi.org/10.1007/11550907_56.

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Li, Jialin, Denes Takacs, Jianwei Lu, Illes Voros, and Gabor Stepan. "Tuning Time Delays to Improve the Performance of a Steering Controller." In Lecture Notes in Mechanical Engineering. Springer Nature Switzerland, 2024. http://dx.doi.org/10.1007/978-3-031-70392-8_69.

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AbstractTime delays and lags in control loops can cause instability and pose significant challenges to engineers. This study investigates a steering controller using the dynamic bicycle model, where the steering system dynamics are approximated by a steering lag. A higher-level controller calculates the desired steering angle based on the vehicle’s lateral position and yaw angle by considering various time delays related to these states. Stability charts are plotted for delay combinations, and the most stable gain setups for the feedback controller are determined. The results indicate that an appropriate increase in one of the time delays expands the stable domain of control gains for the vehicle system, and it enhances the performance of the vehicle controller.

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Pekař, Libor. "Extension of the Pole-Placement Shifting Based Tuning Algorithm to Neutral Delay Systems: A Case Study." In Advances in Intelligent Systems and Computing. Springer International Publishing, 2015. http://dx.doi.org/10.1007/978-3-319-18503-3_9.

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Vítečková, Miluše, Antonín Víteček, and Dagmar Janáčová. "Analog Two Degree of Freedom PID Controllers and Their Tuning by Multiple Dominant Pole Method for Integrating Plants." In Recent Advances in Soft Computing and Cybernetics. Springer International Publishing, 2021. http://dx.doi.org/10.1007/978-3-030-61659-5_26.

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Azzopardi, Joel. "AI and Machine Learning to extend Meteo-Marine Station Observations into the Future." In Monitoring of Mediterranean Coastal Areas: Problems and Measurement Techniques. Firenze University Press, 2024. https://doi.org/10.36253/979-12-215-0556-6.73.

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The real-time availability of data from coastal meteo-marine stations is crucial for various stakeholders, including port authorities, government agencies, researchers, and the general public. While observation data is fundamental, short-term forecasts can significantly enhance planning and decision-making processes. This study explores the application of Machine Learning (ML) techniques to predict hourly values of air temperature, wind speed, atmospheric pressure, and humidity for the next 24 hours. We evaluate three ML models: Long Short-Term Memory Network (LSTM), Random Forest (RF), and Multivariate Linear Regression (LR). The models were trained using Python libraries and Optuna for hyperparameter tuning on datasets of varying lengths from stations in the Malta-Sicily channel. Additionally, we investigated transfer learning with the ERA5 dataset, which provides hourly values over an 83-year period, to address the challenge of limited data availability. The results show that models trained on longer datasets generally achieve better performance. Furthermore, the models demonstrated considerable generalizability, particularly across nearby stations, allowing models trained at one station to be effectively used for predictions at other proximate stations. To support further research and practical application, we have made our models and tools publicly available.

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Amrouni, Oula, Wième Ouertani, Alberto Sánchez, et al. "Characterization of Marine Dredged Sediment, from the Port of Kalâat Andalous (Bay of Gulf of Tunis), Tunisia." In Recent Advances in Environmental Science from the Euro-Mediterranean and Surrounding Regions. Springer International Publishing, 2018. http://dx.doi.org/10.1007/978-3-319-70548-4_489.

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Pega, Stéphanie, Cédric Boissière, Alexandra Chaumonnot, and Clément Sanchez. "Tuning pore size and acidity of mesostructured aluminosilicates made by spray drying: design of new catalysts." In Zeolites and related materials: Trends, targets and challenges, Proceedings of the 4th International FEZA Conference. Elsevier, 2008. http://dx.doi.org/10.1016/s0167-2991(08)80243-1.

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Hoyos L.R., Laikram A., Pérez-Ruiz D., and Puppala A.J. "Modeling unsaturated soil behavior under multiaxial stress states." In Proceedings of the 17th International Conference on Soil Mechanics and Geotechnical Engineering. IOS Press, 2009. https://doi.org/10.3233/978-1-60750-031-5-182.

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This paper presents the results from a preliminary series of conventional triaxial compression (CTC) and triaxial compression (TC) tests conducted on compacted silty sand (SM) under constant-suction states. The experiments were conducted by using a novel, servo-controlled, true triaxial (cubical) apparatus that is suitable to test 3-in (7.5-cm) per side, cubical specimens of unsaturated soil under controlled-suction states and for a wide range of stress paths that are not achievable in a conventional cylindrical apparatus. The equipment is a mixed-boundary type of device, with the specimen seated on top of a high-air-entry ceramic disk and between five flexible (latex) membranes on the remaining sides of the cube. The cell features two independent pore-air (ua) and pore-water (uw) pressure control systems via a PCP-5000-UNSAT pressure panel. Target suction levels are induced and kept constant during testing using the axis-translation technique. The technique is implemented by utilizing the s = uatesting concept (uw= 0), which plays a fundamental role in characterizing unsaturated soil behavior under multiaxial stress paths that are likely to be experienced in the field. Results from suction-controlled tests under axisymmetric conditions (&sigma;2= &sigma;3) were used for calibration and further fine-tuning of the original elasto-plastic, critical state based framework postulated by the Barcelona Model (Alonso et al. 1990). Matric suction was found to exert a noticeable influence on the soil's stress-strain-strength behavior under multiaxial stress states. Numerical predictions of experimental stress-strain response of silty sand under axisymmetric conditions, using the Barcelona Model, were proved to be reasonably accurate.

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Conference papers on the topic "Pore tuning"

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Li, Haolun, Fuchen Zheng, Ye Liu, et al. "Adaptive Skeleton Prompt Tuning for Cross-Dataset 3D Human Pose Estimation." In ICASSP 2025 - 2025 IEEE International Conference on Acoustics, Speech and Signal Processing (ICASSP). IEEE, 2025. https://doi.org/10.1109/icassp49660.2025.10890436.

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Lee, Jeonghwan, Heywon Yun, Jimin Kim, and Homa Fashandi. "Improving Human Pose-Conditioned Generation: Fine-Tuning ControlNet Models with Reinforcement Learning." In 2025 IEEE/CVF Winter Conference on Applications of Computer Vision Workshops (WACVW). IEEE, 2025. https://doi.org/10.1109/wacvw65960.2025.00020.

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Suzuki, Tomohiro, Ryota Tanaka, Kazuya Takeda, and Keisuke Fujii. "Pseudo-label based unsupervised fine-tuning of a monocular 3D pose estimation model for sports motions." In 2024 IEEE/CVF Conference on Computer Vision and Pattern Recognition Workshops (CVPRW). IEEE, 2024. http://dx.doi.org/10.1109/cvprw63382.2024.00336.

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Hagelskjær, Frederik. "Good Grasps Only: A data engine for self-supervised fine-tuning of pose estimation using grasp poses for verification." In 2025 IEEE/SICE International Symposium on System Integration (SII). IEEE, 2025. https://doi.org/10.1109/sii59315.2025.10870966.

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Razavi, Reza, and Stephen A. Sarles. "Modeling and Experiments on Liquid-Infused, Mechanically Activated Porous Materials." In ASME 2016 Conference on Smart Materials, Adaptive Structures and Intelligent Systems. American Society of Mechanical Engineers, 2016. http://dx.doi.org/10.1115/smasis2016-9046.

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The goal of our research is to develop new understanding regarding the design and fabrication of mechanically activated liquid-infused porous films. Our unique approach is to consider a thin, elastic material that features well-defined pores, which are plugged with an infusing liquid that preferentially wets to the walls of the pores. By tuning the geometry of the pores, liquid-filled pores can be rearranged into a configuration that creates an open pore by applying stretch to the solid material, and they close (i.e. heal) again when the stretch is removed. Impregnating the pores with liquid seeks to avoid limitations that prevent complete pore closure and allows for tailoring of the pore geometry to drive liquid redistribution in the pore. The specific objective of this research is to study the effects of pore geometry and liquid wetting for creating fully reversible, stretch-activated pores. Our approach is both computational and experimental: Surface Evolver software is utilized to predict minimal energy wetting states of liquid in various pore shapes, and experiments on porous elastomers infused with either water or mineral oil allow measurements of stretch-induced changes in wetting properties and porosity. Both modeling and experiments demonstrate that a tear-shaped pore, which consists of a circular pore that features a taper extending in a radial direction, can enable reversible opening and closing of the pore via liquid redistribution. Our results indicate that infusing liquids with lower surface tensions and lower contact angles on walls of the pore exhibit better reversibility during the application of stretch.

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Soroush, Farid, Tanya Liu, Qianying Wu, et al. "Contact Angle Tuning of Copper Microporous Structures." In ASME 2021 International Technical Conference and Exhibition on Packaging and Integration of Electronic and Photonic Microsystems. American Society of Mechanical Engineers, 2021. http://dx.doi.org/10.1115/ipack2021-73334.

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Abstract Two-phase, capillary-fed cooling devices are appealing thermal management technologies due to their potential for high heat transfer performance and ease of system-level integration. While existing evaporative wicking structures such as copper inverse opals (CIOs) and copper wire meshes (CWMs) have shown promise for achieving target heat dissipation rates of 100 Wcm−2 or greater, the reliability of these structures for long-term device operation and optimal capillary-driven boiling performance has not received much attention. To ensure proper functionality of the evaporator wick, the microporous copper structures must retain a hydrophilic contact angle during device operation. Surface oxidation of the copper is a critical degradation mechanism that must be addressed to preserve the integrity of the wick. In this study, we systematically investigate the contact angle change of untreated copper and various copper oxides under different conditions. To avoid the formation of hydrophobic Cu2O, we pre-oxidize the copper micro porous wick to form hydrophilic cupric oxide CuO and study the effect of various thermal and chemical oxidation recipes on the hydrophilicity and morphology of the resulting structures. A chemical oxidation formula is implemented for the creation of a stable superhydrophilic surface at a low temperature (70°C) for copper inverse opals (CIOs) (5 μm pore size) and copper wire meshes (CWMs) (76 μm pore opening). The recipe has been optimized to create nano CuO needles with a length of &lt; 100 nm and keep the necks (∼1 μm diameter) open for better capillary wicking of the working fluid. The findings of this study potentially benefit the development of copper-based capillary-fed cooling devices.

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Shayesteh Moghaddam, Narges, Amirhesam Amerinatanzi, Soheil Saedi, Ali Sadi Turabi, Haluk Karaca, and Mohammad Elahinia. "Stiffness Tuning of NiTi Implants Through Aging." In ASME 2016 Conference on Smart Materials, Adaptive Structures and Intelligent Systems. American Society of Mechanical Engineers, 2016. http://dx.doi.org/10.1115/smasis2016-9289.

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NiTi alloys are interesting materials for biomedical implants since they offer unique characteristics such as superelastic behavior, low stiffness (I.e., modulus of elasticity) close to that of the cortical bone, and shock absorption. Thermal treatments are the most common and practical ways to improve the superelasticity of these alloys. In addition to the superelastic behavior of the metallic implants, it is important for the implants to have a stiffness similar to that of cortical bone in order to reduce the risk of failure caused by stress shielding. The cortical bone has a stiffness ranging from 12 to 31 GPa for different patients (e.g., sex, age, mechanical behavior of bone) and various bone locations (e.g., jaw implant, hip implant), while the untreated Ni-rich NiTi has the stiffness equal to 41.37 GPa. One recently used technique to lower the stiffness of NiTi implant is to introduce porosity into the implant. The major problem associated with the imposed porosity is stress concentration on the pore walls and the subsequent implant failure. In this work, the purpose is to tune the stiffness via changing the post-heat treatment conditions, i.e., aging time and aging temperature. In this study, several bulk specimens of Ni-rich NiTi (SLM Ni50.8Ti49.2) were additively manufactured using selective laser melting (SLM) technique. The samples were solution annealed (950 °C, 5.5 h) and subsequently water quenched to provide equilibrium state in the samples. Subsequently, different aging conditions (350 °C and 450 °C for 5 to 18 hours) were applied to the samples. Mechanical testing (compression) was conducted on the samples and the stiffness of each sample was defined to investigate the effect of aging on the stiffness. Our results indicate that the range of 29.9 to 43.7 GPa for stiffness can be achieved through the implant via different time period and temperatures for aging. The modulus of 43.7 GPa is attributed to 10 hours heat treatment under 450 °C and the modulus of 29.9 GPa is attributed to 18 hours heat treatment under 350 °C.

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Alward, W., and M. Al-Jubouri. "Implementation of Machine Learning Approach in Pore Size Evaluation Workflows for Carbonate Reservoirs." In GOTECH. SPE, 2024. http://dx.doi.org/10.2118/219317-ms.

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Abstract The petrophysical evaluation of carbonate reservoirs presents a significant challenge due to complex diagenetic processes that alter reservoir properties. Advanced log measurements, such as NMR T2 relaxation time and borehole images, are often necessary to evaluate the carbonate pore systems (micro, meso, and macro pores), and permeability and infer the impact of diagenesis on reservoir properties. The absence of these measurements may lead to inappropriate estimation of reserves and inadequate development strategies. To address this challenge, we propose a novel interpretation method that utilizes machine learning algorithms to perform carbonate porosity partitioning (micro, meso, and macro) using standard log measurements (e.g., resistivity, density, neutron, sonic, and gamma-ray). We trained the machine learning model in key wells with NMR and/or borehole images to establish relationships between standard logs and carbonate pore partitions. Subsequently, we applied the model to other wells to predict the target pore volumes. Standard ML model workflow (data cleaning, feature engineering, train/split, hyperparameter tuning) was followed. We present a comprehensive workflow for accurate evaluation and characterization of carbonate reservoirs where NMR measurements are not available. We successfully applied this workflow to datasets from heterogeneous carbonate reservoirs in South Iraq to obtain reliable carbonate pore partitions. These pore volumes were then used to estimate permeability and variable cementation exponent to improve water saturation and perform carbonate rock typing. Our proposed methodology provides a reliable and efficient approach (if applied with domain knowledge and reservoir considerations) for the petrophysical evaluation of inter- and intragranular, vuggy carbonate reservoirs, particularly in cases where advanced log measurements are not available, overcoming challenges with the traditional interpretation methods in such complex reservoirs.

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Fang, Jin, and Laurent Pilon. "Thermal Conductivity of Crystalline Nanoporous Silicon Using Molecular Dynamics Simulations." In ASME 2011 International Mechanical Engineering Congress and Exposition. ASMEDC, 2011. http://dx.doi.org/10.1115/imece2011-64785.

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This study establishes that the effective thermal conductivity keff of crystalline nanoporous silicon is strongly affected not only by the porosity fv and the system’s length Lz but also by the pore interfacial area concentration Ai. The thermal conductivity of crystalline nanoporous silicon was predicted using non-equilibrium molecular dynamics (NEMD) simulations. The Stillinger-Weber potential for silicon was used to simulate the interatomic interactions. Spherical pores organized in a simple cubic lattice were introduced in a crystalline silicon matrix by removing atoms within selected regions of the simulation cell. Effects of the (i) system length ranging from 13 to 130 nm, (ii) pore diameter varying between 1.74 and 5.86 nm, and (iii) porosity ranging from 8% to 38%, on thermal conductivity were investigated. A physics-based model was also developed by combining kinetic theory and the coherent potential approximation. The effective thermal conductivity was proportional to (1–1.5fv) and inversely proportional to the sum (Ai/4+1/Lz). This model was in excellent agreement with the thermal conductivity of nanoporous silicon predicted by MD simulations for spherical pores (present study) as well as for cylindrical pores and vacancy defects reported in the literature. These results will be useful in designing nanostructured materials with desired thermal conductivity by tuning their morphology.

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Safonov, Ilia, Anton Kornilov, and Iryna Reimers. "Rendering Semisynthetic FIB-SEM Images of Rock Samples." In 31th International Conference on Computer Graphics and Vision. Keldysh Institute of Applied Mathematics, 2021. http://dx.doi.org/10.20948/graphicon-2021-3027-855-863.

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Digital rock analysis is a prospective approach to estimate properties of oil and gas reservoirs. This concept implies constructing a 3D digital twin of a rock sample. Focused Ion Beam - Scanning Electron Microscope (FIB-SEM) allows to obtain a 3D image of a sample at nanoscale. One of the main specific features of FIB-SEM images in case of porous media is pore-back (or shine-through) effect. Since pores are transparent, their back side is visible in the current slice, whereas, in fact, it locates in the following ones. A precise segmentation of pores is a challenging problem. Absence of annotated ground truth complicates fine-tuning the algorithms for processing of FIB-SEM data and prevents successful application of machine- learning-based methods, which require a huge training set. Recently, several synthetic FIB- SEM images based on stochastic structures were created. However, those images strongly differ from images of real samples. We propose fast approaches to render semisynthetic FIB- SEM images, which imply that intensities of voxels of mineral matrix in a milling plane, as well as geometry of pore space, are borrowed from an image of rock sample saturated by epoxy. Intensities of voxels in pores depend on the distance from milling plane to the given voxel along a ray directed at an angle equal to the angle between FIB and SEM columns. The proposed method allows to create very realistic FIB-SEM images of rock samples with precise ground truth. Also, it opens the door for numerical estimation of plenty of algorithms for processing FIB-SEM data.

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