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排序方式: 共有134条查询结果,搜索用时 62 毫秒
61.
Cabanillas-Gonzalez J Egelhaaf HJ Brambilla A Sessi P Duò L Finazzi M Ciccacci F Lanzani G 《Nanotechnology》2008,19(42):424010
We characterize photoinduced charge injection at the interface between a fluorinated copper phthalocyanine (CuPcF(16)) film deposited over a GaAs(100) wafer by means of pump-probe spectroscopy combined with ultraviolet photoemission spectroscopy (UPS) and electromodulated transmission spectroscopy. UPS characterization of the hybrid interface demonstrates that the CuPcF(16) 's lowest unoccupied molecular level (LUMO) is almost aligned with the GaAs conduction band. Upon photoexcitation of the hybrid interface with 150 fs pulses we observe an efficient photoinduced electron transfer from CuPcF(16) to GaAs. The evolution of interfacial CuPcF(16) charges appear to be strongly influenced by energy level alignment at the GaAs/CuPcF(16) heterojunction. 相似文献
62.
Two‐Color Emitting Colloidal Nanocrystals as Single‐Particle Ratiometric Probes of Intracellular pH
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Francesco Bruni Jacopo Pedrini Caterina Bossio Beatriz Santiago‐Gonzalez Francesco Meinardi Wan Ki Bae Victor I. Klimov Guglielmo Lanzani Sergio Brovelli 《Advanced functional materials》2017,27(12)
Intracellular pH is a key parameter in many biological mechanisms and cell metabolism and is used to detect and monitor cancer formation and brain or heart diseases. pH‐sensing is typically performed by fluorescence microscopy using pH‐responsive dyes. Accuracy is limited by the need for quantifying the absolute emission intensity in living biological samples. An alternative with a higher sensitivity and precision uses probes with a ratiometric response arising from the different pH‐sensitivity of two emission channels of a single emitter. Current ratiometric probes are complex constructs suffering from instability and cross‐readout due to their broad emission spectra. Here, we overcome such limitations using a single‐particle ratiometric pH probe based on dot‐in‐bulk CdSe/CdS nanocrystals (NCs). These nanostructures feature two fully‐separated narrow emissions with different pH sensitivity arising from radiative recombination of core‐ and shell‐localized excitons. The core emission is nearly independent of the pH, whereas the shell luminescence increases in the 3–11 pH range, resulting in a cross‐readout‐free ratiometric response as strong as 600%. In vitro microscopy demonstrates that the ratiometric response in biologic media resembles the precalibralation curve obtained through far‐field titration experiments. The NCs show good biocompatibility, enabling us to monitor in real‐time the pH in living cells. 相似文献
63.
Giorgio E. Bonacchini Caterina Bossio Francesco Greco Virgilio Mattoli Yun‐Hi Kim Guglielmo Lanzani Mario Caironi 《Advanced materials (Deerfield Beach, Fla.)》2018,30(14)
The use of natural or bioinspired materials to develop edible electronic devices is a potentially disruptive technology that can boost point‐of‐care testing. The technology exploits devices that can be safely ingested, along with pills or even food, and operated from within the gastrointestinal tract. Ingestible electronics can potentially target a significant number of biomedical applications, both as therapeutic and diagnostic tool, and this technology may also impact the food industry, by providing ingestible or food‐compatible electronic tags that can “smart” track goods and monitor their quality along the distribution chain. Temporary tattoo‐paper is hereby proposed as a simple and versatile platform for the integration of electronics onto food and pharmaceutical capsules. In particular, the fabrication of all‐printed organic field‐effect transistors on untreated commercial tattoo‐paper, and their subsequent transfer and operation on edible substrates with a complex nonplanar geometry is demonstrated. 相似文献
64.
The ethical monitoring of brain-machine interfaces (BMIs) is discussed in connection with the potential impact of BMIs on
distinguishing traits of persons, changes of personal identity, and threats to personal autonomy. It is pointed out that philosophical
analyses of personhood are conducive to isolating an initial thematic framework for this ethical monitoring problem, but a
contextual refinement of this initial framework depends on applied ethics analyses of current BMI models and empirical case-studies.
The personal autonomy-monitoring problem is approached by identifying various ways in which the inclusion of a robotic controller
in the motor pathway of an output BMI may limit or jeopardize personal autonomy. 相似文献
65.
Francesco Di Girolamo Andrea Masotti Guglielmo Salvatori Margherita Scapaticci Maurizio Muraca Lorenza Putignani 《International journal of molecular sciences》2014,15(8):13697-13719
She-donkey’s milk (DM) and goat’s milk (GM) are commonly used in newborn and infant feeding because they are less allergenic than other milk types. It is, therefore, mandatory to avoid adulteration and contamination by other milk allergens, developing fast and efficient analytical methods to assess the authenticity of these precious nutrients. In this experimental work, a sensitive and robust matrix-assisted laser desorption/ionization time-of-flight mass spectrometry (MALDI-TOF MS) profiling was designed to assess the genuineness of DM and GM milks. This workflow allows the identification of DM and GM adulteration at levels of 0.5%, thus, representing a sensitive tool for milk adulteration analysis, if compared with other laborious and time-consuming analytical procedures. 相似文献
66.
67.
Thomas J. R. Hughes Guglielmo Scovazzi Tayfun E. Tezduyar 《Journal of scientific computing》2010,43(3):343-368
This article reviews 25 years of research of the authors and their collaborators on stabilized methods for compressible flow
computations. An historical perspective is adopted to document the main advances from the initial developments to modern approaches. 相似文献
68.
Cervenka J Kosina H Selberherr S Zhang J Hrauda N Stangl J Bauer G Vastola G Marzegalli A Montalenti F Miglio L 《Solid-state electronics》2011,(6-3):81-87
The potential of strained DOTFET technology is demonstrated. This technology uses a SiGe island as a stressor for a Si capping layer, into which the transistor channel is integrated. The structure information of fabricated samples is extracted from atomic force microscopy (AFM) measurements. Strain on the upper surface of a 30?nm thick Si layer is in the range of 0.7%, as supported by finite element calculations. The Ge content in the SiGe island is 30% on average, showing an increase towards the top of the island. Based on the extracted structure information, three-dimensional strain profiles are calculated and device simulations are performed. Up to 15% enhancement of the NMOS saturation current is predicted. 相似文献
69.
70.
Fiodor Sorrentino Kai Bongs Philippe Bouyer Luigi Cacciapuoti Marella de Angelis Hansjoerg Dittus Wolfgang Ertmer A. Giorgini J. Hartwig Matthias Hauth Sven Herrmann Massimo Inguscio Endre Kajari Thorben T. Könemann Claus Lämmerzahl Arnaud Landragin Giovanni Modugno Frank Pereira dos Santos Achmin Peters Marco Prevedelli Ernst M. Rasel Wolfgang P. Schleich Malte Schmidt Alexander Senger Klaus Sengstock Guillaume Stern Guglielmo Maria Tino Reinhold Walser 《Microgravity science and technology》2010,22(4):551-561
Atom interferometry represents a quantum leap in the technology for the ultra-precise monitoring of accelerations and rotations and, therefore, for the science that relies on these quantities. These sensors evolved from a new kind of optics based on matter-waves rather than light-waves and might result in an advancement of the fundamental detection limits by several orders of magnitude. This paper describes the current status of the Space Atom Interferometer project (SAI), funded by the European Space Agency. In a multi-pronged approach, SAI aims to investigate both experimentally and theoretically the various aspects of placing atom interferometers in space: the equipment needs, the realistically expected performance limits and potential scientific applications in a micro-gravity environment considering all aspects of quantum, relativistic and metrological sciences. A drop-tower compatible atom interferometry acceleration sensor prototype has been designed, and the manufacturing of its subsystems has been started. A compact modular laser system for cooling and trapping rubidium atoms has been assembled. A compact Raman laser module, featuring outstandingly low phase noise, has been realized. Possible schemes to implement coherent atomic sources in the atom interferometer have been experimentally demonstrated. 相似文献