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361.
Rares Buta Emanuel Puschita Botond Sandor Kirei Cristian Codau Tudor Palade Paul Dolea Andra Pastrav 《International Journal of Satellite Communications and Networking》2023,41(5):477-498
The scope of this paper is to present the proof-of-concept and functional verification of a Wireless-SpaceWire bridge (High-Throughput Wireless-SpaceWire Bridge for Intra-Satellite Transmissions [HiSAT] bridge) designed to replace the wired SpaceWire (SpW) connections for intraspacecraft communications. To provide proper data handling and conversion, the proposed solution implements two main components: (1) the SpW Converter, which provides the SpW interface, and (2) the Wireless Converter, which provides the multiantenna radio frequency (RF) front-end. High-end research infrastructure is used in the solution implementation. STAR-Dundee SpW products emulate real spacecraft instrumentation and implement the SpW links and interfaces. Xilinx FPGA ZCU102 boards are used for the implementation of the hardware/software communication stack of the SpW Converter. A comprehensive National Instruments USRP Software Defined Radio platform is used to implement the Wireless Converter. End-to-end laboratory tests are run to evaluate the performance of the proposed solution in terms of average end-to-end delay, average data rate, and packet success rate and to assess the technology readiness. The results demonstrate that the HiSAT bridge is TRL4 and that the technological approach (i.e., using FPGAs and OFDM transmissions) can successfully replace an on-board intraspacecraft SpW link. 相似文献
362.
363.
Xiaojiao Yuan Rebeca Ferrer-Campos Felipe A. Garcés-Pineda Katherine Villa 《Small (Weinheim an der Bergstrasse, Germany)》2023,19(19):2207303
Analogous to photosynthetic systems, photoactive semiconductor-based micro/nanoswimmers display biomimetic features that enable unique light harvesting and energy conversion functions and interactions with their surroundings. However, these artificial swimmers are usually non-selective and provide ineffective target recognition, resulting in poor surface analyte binding that affects the overall reactivity and motion efficiency. Here, the surface engineering of light-driven BiVO4 microswimmers by molecular imprinting polymerization is presented. After embedding surface recognition sites, the modified microswimmers can self-propel in a solution of a target molecule, without requiring toxic fuels, and degrade the target selectively in a pollutant mixture. These findings show that optimizing the design of semiconductor-based microswimmers with specific target recognition cavities on their surface is a promising strategy to achieve selective capture and degradation of organic pollutants, which is otherwise impossible because of the non-selective behavior of photogenerated reactive radicals. Moreover, this study provides a unique strategy to enhance the motion capabilities of single-component photocatalytic microswimmers in a specific chemical environment. 相似文献
364.
Daniela Gheorghe Sandra Díez-Villares Romica Sandu Ana Neacsu Dana-Andreea Neacsu Adriana Serban Alina Botea-Petcu Vlad Tudor Popa Jenifer Garcia-Fernandez Rafael López López Maria de la Fuente Freire Florina Teodorescu Speranta Tanasescu 《大分子材料与工程》2023,308(6):2200622
The recent focus in the development of novel nanosystems for biomedical applications lays firmly on their interactions with biomolecules. Thermodynamic parameters driving the interaction between nanoparticles and proteins provide insights into complex processes at bio/nanointerface. The present work aims to investigate the binding mechanisms and the dominant contributions that determine the adsorption processes during the interactions of a model protein, that is, bovine serum albumin, with a new type of drug delivery systems, Vitamin E/sphingomyelin nanoemulsions, plain and coated with polyethylene glycol, and d -ɑ-tocopheryl polyethylene glycol succinate. The binding parameters (binding constant, binding stoichiometry, enthalpy, Gibbs energy, and entropy changes of binding) are evaluated by the isothermal titration calorimetry with a MicroCaliTC200 equipment. The effect of nanoemulsions on the protein stability is examined by measuring the thermodynamic parameters for the protein's unfolding (heat capacity; enthalpy, entropy, and free energy changes) with a NanoDSC (TA Instrument) apparatus. The thermodynamic profile shows for all compositions an entropy-driven interaction dominated by hydrophobic forces due to the rearrangements/displacement of the surrounding water molecules, while maintaining the native conformation of the protein. All the information acquired by thermodynamic approach may significantly enhance the knowledge with special focus on PEGylated nanoemulsions used for biomedical applications. 相似文献
365.
Nanoclay‐reinforced poly(butylene adipate‐co‐terephthalate) biocomposites for packaging applications
Birgit Bittmann Rebeca Bouza Luis Barral M. Victoria Gonzlez‐Rodríguez María‐Jos Abad 《Polymer Composites》2012,33(11):2022-2028
Increasing generation and inadequate disposal of waste progressively compromise our environment. Solutions are proposed by the development of biodegradable polymers, that is, for short‐term applications like packaging. The present study focuses on the design and characterization of biodegradable poly(butylene adipate‐co‐terephthalate) (PBAT) nanocomposites reinforced by different types of nanoclays. The addition of natural and modified montmorillonite and bentonite to PBAT by melt mixing enhances slightly the thermal stability and increases the crystallization temperature, independently of the fillers' dispersion state. By contrast, storage modulus in dynamic mechanical analysis is increased when adding nanoclay, and improvement is higher for well‐dispersed organomodified fillers. Dispersion states and morphology of the nanocomposites are studied by X‐ray diffraction as well as scanning and transmission electron microscopy. PBAT‐based composites with modified bentonite reveal to show the best performance at room temperature (which is the temperature of interest for potential packaging applications) in comparison with the other investigated nanocomposites.POLYM. COMPOS., 33:2022–2028, 2012. © 2012 Society of Plastics Engineers 相似文献