Abstract
Since Liangzhu culture was recognised as the earliest monarchical period in the history of China, its vitality has been acknowledged both by the public and archaeologists in China and ...worldwide. Several contributions to current regeneration practices, including exhibitions, innovative cultural products, and integrations with nearby areas, remain in the preliminary stages due to the relative youth of the Liangzhu archaeological sites and museum, while their adoption of VR and AR technologies is also limited in practice. Referencing relevant cases in the literature and an interview with a manager involved with the archaeological work on Liangzhu culture, this article provides recommendations for exhibitions that emphasise the adoption of digital and multimedia displays and simulated restorations. Meanwhile, innovative cultural products require improvements related to design and development that match customer preferences. To integrate Liangzhu culture with nearby tourist attractions, comprehensive studies are needed on the spiritual connections that local communities develop with their original living spaces and the forms of their participation in heritage conservation practices. This article also presents several technical improvements for VR and AR, such as new methods for constructing digital models and the choice of presentation medium. Potential usages for AR technology with simulated restorations, interactive activities, innovative cultural products, and new public spaces nearby have also been suggested. Supported by the detailed discussion of restoration practices in these recommendations, this article provides an integrative regeneration plan for all “large” and “earthen” Neolithic archaeological cultures that resemble Liangzhu culture.
Intracellular pH is closely related with many biological processes, including cellular proliferation, apoptosis, endocytic processes, signal transduction, and enzymatic activity. The use of ...fluorescent probes has become an essential method for intracellular pH detection, but existing fluorescent probes have substantial limitations, such as requiring tedious synthetic preparation, suffering from an inappropriate response range and insufficiently long emission wavelength. In this work, a red emissive two‐photon fluorescence probe based on carbon dots (pH‐CDs) is fabricated using a facile one‐pot hydrothermal method for the monitoring of intracellular pH. pH‐CDs possess a variety of superior properties, including high selectivity, excellent photostability, and low cytotoxicity. Furthermore, they exhibit a pH‐sensitive response in the range of 1.0–9.0 and a linear range of 3.5–6.5, which is desirable for tracking the pH value in living cells. It is demonstrated that the pH‐dependent fluorescence signal is regulated via switching between aggregation and disaggregation of CDs. More importantly, pH‐CDs can be successfully applied to sense and visualize pH fluctuation in cells, tissue, and zebrafish. These findings suggest that the as‐prepared pH‐CDs probe has significant potential for practical application in living systems.
A pH‐responsive probe based on carbon dots is fabricated for two‐photon fluorescence imaging in living systems. The aggregation causes quenching switched by pH‐induced protonation, which is utilized to modulate the fluorescence emission intensity, achieving intracellular pH monitoring. Considering the “turn‐on” signals of acidic conditions, the as‐prepared pH‐CDs can be applied for acidic environment imaging in vivo.
Layered WS2 nanosheet is a kind of two-dimensional (2D) covalent-network solid material with remarkable structural and electronic properties that has attracted increasing interest in recent years. In ...this work, we propose a one-step sonication-assisted exfoliation method to prepare water-soluble WS2 nanosheet and demonstrate its application as a biosensing platform. The synthesis route is simple and straightforward. We reveal that single-strand DNA (ssDNA) chains can readily be adsorbed on the nanosheet, leading to complete and fast quenching of a fluorescent dye tagged to the DNA chain. The adsorbed ssDNA is detachable from the nanosheet upon the interaction with other biomolecules, resulting in the restoration of the fluorescence. The 2D WS2 nanosheet thus acts as an efficient platform for assembling of bioprobes. Because of the extraordinarily high quenching efficiency, which is the synergic result of both excited-state energy transfer and static quenching, the WS2 platform affords minimal background and high sensitivity. Our attempt will extend the application of this material to biosensing and probing areas.
In order to make the landscape design concept break through the traditional barriers and achieve diversification and nationalized development, this paper proposes a landscape design model that ...integrates traditional culture to effectively integrate traditional culture and landscape design. First use active adaptation technology to test the algorithm convergence ability, and then sample the basic situation of landscape design, reconstruct the collected information, construct the characteristic information flow, and use the linear regression analysis model and the Internet of Things technology to construct the distribution The structure model is used to analyze its characteristics. Then, by introducing the nonlinear dynamic inertia weight coefficient, according to the traditional particle swarm algorithm, the optimized particle swarm algorithm is proposed, and its robustness is tested, the error is analyzed, and the error values are all less than 0.1.Finally, the model in this paper is experimentally tested in a quantitative way. The results show that the traditional culture and landscape design fusion model proposed in this paper has a reasonable error value and has practical application significance.
Amorphous MoS2 nanoflowers assembled by lamellar nanosheets have been successfully synthesized by a facile hydrothermal method. They were characterized by X-ray diffraction (XRD), Raman spectroscopy, ...scanning electron microscopy (SEM) and transmission electron microscopy (TEM), and evaluated as electrochemical catalysts in the hydrogen evolution reaction (HER). Moreover, the effect of preparation temperature was also discussed. It was found that these catalysts exhibited excellent HER activity compared to commercial bulk MoS2 microparticles due to the special structure of nanoflowers assembled by nanosheets with few layers, exposing much more active sites and reducing intrinsic resistance. And the catalyst obtained at 220 °C showed the best activity with the largest exchange current density and the smallest Tafel slope of 52 mV dec−1, which made it a promising HER electrocatalyst for practical applications.
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•Amorphous MoS2 nanoflowers have been successfully prepared by a hydrothermal method.•Amorphous MoS2 nanoflowers exhibit excellent activity and stability in the HER.•A relatively low Tafel slope of 52 mV dec−1 was obtained.•A small onset potential of −130 mV was also observed.
A clear elucidation of a disease-related viscosity change in vivo is significant yet highly challenging as well. Fluorescence imaging in the second near-infrared region (NIR-II, 1000-1700 nm) has ...gained increasing attention for observation in living organisms, but a viscosity-activatable fluorescent probe emitting at this region remains a vacancy. Herein, we report the first panel of a viscosity-activated NIR-II emissive fluorescent probe
. By embedding different substituents into the
platform and screening, we obtained an ideal probe,
, which displayed the best combination of properties, including a 31-fold fluorescence enhancement in response to viscosity, insensitivity to environments (pH, polarity), and relatively high quantum yield (1.6% in glycerol).
was successfully applied to track the variation of viscosity in diabetes-induced liver injury in vivo.
Abstract
Ultra-wide bandgap semiconductor Ga
2
O
3
based electronic devices are expected to perform beyond wide bandgap counterparts GaN and SiC. However, the reported power figure-of-merit hardly ...can exceed, which is far below the projected Ga
2
O
3
material limit. Major obstacles are high breakdown voltage requires low doping material and PN junction termination, contradicting with low specific on-resistance and simultaneous achieving of n- and p-type doping, respectively. In this work, we demonstrate that Ga
2
O
3
heterojunction PN diodes can overcome above challenges. By implementing the holes injection in the Ga
2
O
3
, bipolar transport can induce conductivity modulation and low resistance in a low doping Ga
2
O
3
material. Therefore, breakdown voltage of 8.32 kV, specific on-resistance of 5.24 mΩ⋅cm
2
, power figure-of-merit of 13.2 GW/cm
2
, and turn-on voltage of 1.8 V are achieved. The power figure-of-merit value surpasses the 1-D unipolar limit of GaN and SiC. Those Ga
2
O
3
power diodes demonstrate their great potential for next-generation power electronics applications.
We report herein the discovery of methylamine (CH3NH2) induced defect‐healing (MIDH) of CH3NH3PbI3 perovskite thin films based on their ultrafast (seconds), reversible chemical reaction with CH3NH2 ...gas at room temperature. The key to this healing behavior is the formation and spreading of an intermediate CH3NH3PbI3⋅xCH3NH2 liquid phase during this unusual perovskite–gas interaction. We demonstrate the versatility and scalability of the MIDH process, and show dramatic enhancement in the performance of perovskite solar cells (PSCs) with MIDH. This study represents a new direction in the formation of defect‐free films of hybrid perovskites.
A perovskite smoothie: Treating CH3NH3PbI3 (MAPbI3) perovskite thin films with methylamine gas induces a rapid collapse of the perovskite structure and formation of a liquid phase. Removing the gas causes conversion back into the perovskite structure giving a smooth defect‐free film. Using the film in perovskite solar cells enhances their performance.
A
bstract
We study, in the framework of the entanglement harvesting protocol, the entanglement harvesting of both a pair of inertial and uniformly accelerated detectors locally interacting with ...vacuum massless scalar fields subjected to a perfectly reflecting plane boundary. We find that the presence of the boundary generally degrades the harvested entanglement when two detectors are very close to the boundary. However, when the distance between detectors and the boundary becomes comparable to the interaction duration parameter, the amount of the harvested entanglement approaches a peak, which even goes beyond that without a boundary. Remarkably, the parameter space of the detectors’ separation and the magnitude of acceleration that allows entanglement harvesting to occur is enlarged due to the presence of the boundary. In this sense, the boundary plays a double-edged role on entanglement harvesting, degrading in general the harvested entanglement while enlarging the entanglement harvesting-achievable parameter space. A comparison of three different acceleration scenarios of the detectors with respect to the boundary, i.e., parallel, anti-parallel and mutually perpendicular acceleration, shows that the phenomenon of entanglement harvesting crucially depends on the acceleration, the separation between two detectors and the detectors’ distance from the boundary.
We developed an ultrasensitive fluorescence resonance energy transfer (FRET) aptasensor for kanamycin detection, using upconversion nanoparticles (UCNPs) as the energy donor and graphene as the ...energy acceptor. Oleic acid modified upconversion nanoparticles were synthesized through a hydrothermal process followed by a ligand exchange with hexanedioic acid. The kanamycin aptamer (5'-NH2-AGATGGGGGTTGAGGCTAAGCCGA-3') was tagged to UCNPs through an EDC–NHS protocol. The π–π stacking interaction between the aptamer and graphene brought UCNPs and graphene in close proximity and hence initiated the FRET process resulting in quenching of UCNPs fluorescence. The addition of kanamycin to the UCNPs–aptamer–graphene complex caused the fluorescence recovery because of the blocking of the energy transfer, which was induced by the conformation change of aptamer into a hairpin structure. A linear calibration was obtained between the fluorescence intensity and the logarithm of kanamycin concentration in the range from 0.01nM to 3nM in aqueous buffer solution, with a detection limit of 9pM. The aptasensor was also applicable in diluted human serum sample with a linear range from 0.03nM to 3nM and a detection limit of 18pM. The aptasensor showed good specificity towards kanamycin without being disturbed by other antibiotics. The ultrahigh sensitivity and pronounced robustness in complicated sample matrix suggested promising prospect of the aptasensor in practical applications.
•An aptasensor is constructed to detect kanamycin based on upconversion fluorescence resonance energy transfer.•The conformation change of kanamycin aptamer into a hairpin structure after interacting with the target is accompanied by the alteration of energy-transfer efficiency.•The aptasensor for kanamycin detection is ultrasensitive.•The aptasensor is robust in human serum samples indicating its prospect of practical applications.
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