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12 results on '"Paper, Michael"'

1. SGX Switchless Calls Made Configless

Author

Yuhala, Peterson, Paper, Michael, Zerbib, Timothée, Felber, Pascal, Schiavoni, Valerio, and Tchana, Alain

Subjects
Computer Science - Cryptography and Security
Abstract

Intel's software guard extensions (SGX) provide hardware enclaves to guarantee confidentiality and integrity for sensitive code and data. However, systems leveraging such security mechanisms must often pay high performance overheads. A major source of this overhead is SGX enclave transitions which induce expensive cross-enclave context switches. The Intel SGX SDK mitigates this with a switchless call mechanism for transitionless cross-enclave calls using worker threads. Intel's SGX switchless call implementation improves performance but provides limited flexibility: developers need to statically fix the system configuration at build time, which is error-prone and misconfigurations lead to performance degradations and waste of CPU resources. ZC-SWITCHLESS is a configless and efficient technique to drive the execution of SGX switchless calls. Its dynamic approach optimises the total switchless worker threads at runtime to minimise CPU waste. The experimental evaluation shows that ZC-SWITCHLESS obviates the performance penalty of misconfigured switchless systems while minimising CPU waste., Comment: 10 pages, 53rd Annual IEEE/IFIP International Conference on Dependable Systems and Networks (DSN)

Published
2023

2. Algal-based Biopolymers

Author

Younes, Samer, Arnold, Nathanael, Paper, Michael, Keil, Linda, Awad, Dania, Brueck, Thomas, Abomohra, Abdelfatah, editor, and Ende, Stephan, editor

Published
2024
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7. Rare earth element stripping from kaolin sands via mild acid treatment.

Author

Koch, Max, Paper, Michael, Brück, Thomas B., and Nilges, Tom

Subjects
*KAOLIN, *CLAY minerals, *SAND, *SULFURIC acid, *HYDROCHLORIC acid, *KAOLINITE
Abstract

Due to their chemical and physical properties, rare earth elements (REEs) are essential in modern applications such as energy conversion or IT technology. The increasing demand for these elements leads to strong incentives for REE recovery and induces the exploration of new, alternative sources for REEs. Accessing REEs from clay minerals, in our case kaolinite, by an elution process is a promising method. The present study investigates the potential application of REE recovery through elution with different mineral acids (HNO3, H2SO4, and HCl) in a microwave process. The material used in this study—residues from an industrial kaolin production process—contained 2.47 g/kg REEs which is a significant amount for REE recovery. The ability of various mineral acids to solubilize metals was studied to assess the REE content of this residual resource. Around 1.87 g/kg of REEs was eluted from industrial kaolinite residues in hydrochloric acid, 1.71 g/kg in sulfuric acid, and 1.13 g/kg in nitric acid. [ABSTRACT FROM AUTHOR]

Published
2024
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8. SGX Switchless Calls Made Configless

Author

Yuhala, Peterson, primary, Paper, Michael, additional, Zerbib, Timothée, additional, Felber, Pascal, additional, Schiavoni, Valerio, additional, and Tchana, Alain, additional

Published
2023
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9. Metal Biosorption by Cyanobacteria Focusing on the Adsorption of Rare Earth Elements

Author

Brück, Thomas (Prof. Dr.), Brück, Thomas (Prof. Dr.);Nilges, Tom (Prof. Dr.);Lakatos, Michael (Priv.-Doz. Dr.), Paper, Michael Josef Dieter, Brück, Thomas (Prof. Dr.), Brück, Thomas (Prof. Dr.);Nilges, Tom (Prof. Dr.);Lakatos, Michael (Priv.-Doz. Dr.), and Paper, Michael Josef Dieter

Abstract

This work provides further insights into the metal adsorption by cyanobacterial biomass thereby offering a better understanding of underlying mechanisms. Moreover, it was demonstrated that cyanobacterial biomass has great potential for future applications in biosorption-based metal recovery from diluted aqueous solutions. Critical parameters for the uptake of Rare Earth Elements by the cyanobacterial biomass were optimized and the dominant chemical mechanisms for metal binding were characterized., Diese Arbeit gibt vertiefte Einblicke in die Metalladsorption durch Cyanobakterien-Biomasse und erweitert dadurch das Verständnis der zugrundeliegenden Mechanismen. Darüber hinaus wurde gezeigt, dass Biomasse von Cyanobakterien großes Potenzial für zukünftige Anwendungen in der biosorptionsbasierten Metallrückgewinnung aus verdünnten wässrigen Lösungen aufweist. Kritische Parameter für die Aufnahme von Seltenen Erden durch die Cyanobakterien-Biomasse wurden optimiert und die dominanten chemischen Mechanismen für die Metallbindung wurden charakterisiert.

Published
2023

11. Efficient Green Light Acclimation of the Green Algae Picochlorum sp. Triggering Geranylgeranylated Chlorophylls

Author

Paper, Michael, primary, Glemser, Matthias, additional, Haack, Martina, additional, Lorenzen, Jan, additional, Mehlmer, Norbert, additional, Fuchs, Tobias, additional, Schenk, Gerhard, additional, Garbe, Daniel, additional, Weuster-Botz, Dirk, additional, Eisenreich, Wolfgang, additional, Lakatos, Michael, additional, and Brück, Thomas B., additional

Published
2022
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12. Isolation and Investigation of Natural Rare Earth Metal Chelating Agents From Calothrix brevissima - A Step Towards Unraveling the Mechanisms of Metal Biosorption

Author

Jurkowski, Wojciech, Paper, Michael, and Brück, Thomas B.

Subjects
Histology, complexation, Biomedical Engineering, mechanism, rare earth elements, calothrix, Bioengineering, cyanobacteria, TP248.13-248.65, biosorption, Biotechnology
Abstract

In this study water soluble compounds that form complexes with Rare Earth Elements (REE) and other metals were isolated from Calothrix brevissima biomass with chromatographic methods for the first time. Molecular characterization showed that the isolated compounds are most likely polysaccharides comprised of arabinose, xylose, mannose, galactose and glucose. FT-IR analysis revealed functional groups involved in the binding mechanism of Tb are likely sulfate- and to a lesser extend hydroxyl-groups. The binding specificity of the isolated compounds was investigated with different metal solutions. Here, ions of the alkali and alkaline earth metals Na, K, Mg and Ca showed no competition for Tb-binding even at 10-fold excess concentration. Ions of the elements Co and Pb on the other hand replaced Tb at higher concentrations. Addition of the isolated compounds significantly reduced the precipitation of Eu at pH-values between 6.7 and 9.5, indicating that the interaction between the isolated chelators and Rare Earth Metals is stable even at high pH-values.

Published
2022

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