Publications

Strain-induced crystal structure change in ultrathin films of Pr0.7Sr0.3MnO3

Ultrathin films (<30 nm) of Pr0.7Sr0.3MnO3 on LaAlO3 have been studied using transmission electron microscopy (TEM). It was shown that the films are highly uniform and defect-free, and that they are coherently strained to the smaller lattice parameter of the substrate, resulting in a tetragonal expansion perpendicular to the film plane and a change of crystal structure from the ordered orthorhombic of bulk materials to a simple tetragonal perovskite. The variation of the tetragonality with distance from the interface was also determined from high-resolution TEM images.

Retraction: He-Wei granules (HWKL) combat cisplatin-induced nephrotoxicity and myelosuppression in rats by inhibiting oxidative stress, inflammatory cytokines and apoptosis

Retraction of ‘He-Wei granules (HWKL) combat cisplatin-induced nephrotoxicity and myelosuppression in rats by inhibiting oxidative stress, inflammatory cytokines and apoptosis’ by Zehai Song et al. , RSC Adv. , 2017, 7 , 19794–19807, https://doi.org/10.1039/C7RA02830J.

Large-Area Triboelectric Nanogenerator Mass Spectrometry: Expanded Coverage, Double-Bond Pinpointing, and Supercharging

Efficient ionization is a necessary condition for mass spectrometric analysis, but many compounds fail to ionize well enough to yield sufficient detection limits. Triboelectric nanogenerators (TENG) coupled to nanoelectrospray ionization (nanoESI) mass spectrometry (MS) are a highly effective approach to high sensitivity MS analysis. Here, we report on new, large-area TENG that constructively leverage the relationship between electrode size, created charges, and open-circuit voltage, leading to wider chemical coverage. Large-area TENG were found to also promote electrospray gas-phase oxidation reactions that enabled double bond position pinpointing for unsaturated lipids and species-specific lipid quantitation. Furthermore, large-area TENG MS of proteins was observed to yield higher charge state distributions (i.e., supercharging) without the need for high surface tension additives.

Dynamical inelastic scattering in high-energy electron diffraction and imaging: A new theoretical approach

A generalized multislice theory is proposed from quantum mechanics to approach the multiple elastic and multiple inelastic scattering of high-energy electrons in a solid. The nonperiodic structure of crystals can be introduced in the calculations for the scattering geometries of transmission electron microscopy and reflection electron microscopy. Detailed applications of this generalized theory will be given for calculating (a) the energy-filtered-plasmon energy-loss diffraction patterns and images, (b) the energy-filtered diffraction patterns from atomic inner-shell losses, and (c) the contribution of thermal diffuse scattering to the high-angle annular-dark-field (ADF) scanning-transmission-electron-microscopy (STEM) lattice images. An ``incoherent'' imaging theory is presented for simulating the ADF STEM images and the detailed calculations are addressed for Ge/Si interfaces.

Carcinoembryonic antigen trajectory predicts pathological complete response in advanced gastric cancer after neoadjuvant chemotherapy

Aims This study aims to develop a simple, clinically applicable classification system to predict pCR based on carcinoembryonic antigen (CEA) trajectory during NAC. Methods This study included 366 AGC patients who received NAC followed by radical gastrectomy. CEA levels were measured before, during, and after NAC, with changes classified into three trajectory types: Type I (>=80% decline), Type II (>=40% but <80% decline), and Type III (<40% decline or increase). We analyzed associations between these CEA trajectories, pCR, lymph node remission, and survival. Results pCR was achieved in 10.4% (38/366) of patients. pCR rates were significantly higher in Type I (41%) and Type II (15.8%) trajectories compared to Type III (6.7%). Lymph node remission also correlated with CEA trajectories, with Type I having the highest proportion of ypN0 (79.2%). Multivariate analysis identified CEA trajectory subtypes and tumor differentiation as independent predictors of pCR. This classification system proved robust across subgroups. Although no significant differences in overall survival were observed between subtypes, higher initial CEA levels were associated with worse survival. Conclusion The trajectory of CEA change during NAC is a promising predictor of pCR in AGC. This simple and accessible classification system may facilitate personalized surgical strategies for patients with AGC.

Triboelectric Polymer with High Thermal Charge Stability for Harvesting Energy from 200 °C Flowing Air

Abstract Due to the thermionic emission effect, the electron transferred to dielectric surface can be released into vacuum after the contact electrification (CE). Therefore, triboelectric nanogenerator (TENG) cannot maintain effective electrical output under high temperature conditions. In order to obtain high thermal charge stability, polyimide is modified with strong electron withdrawing groups like trifluoromethyl (CF 3 ) and sulfone group (SO 2 ) in backbone. The fluorinated polyimides (F‐PI) with a big band gap can provide a tribocharge density of 170 µC m −2 (4 times of common Kapton film) and become more negative than polytetrafluoroethylene in triboelectric series. In addition, BaTiO 3 nanoparticles are doped in F‐PI film for inducing deep traps and interfacial polarizations for CE, which can further enhance the charge density (200 µC m −2 ) and thermal charge stability. Finally, a flutter‐driven TENG (FD‐TENG) is designed based on this BaTiO 3 ‐doped F‐PI film to harvest wind energy and sense wind velocity. This FD‐TENG can maintain 32% of its output performance at 200 °C in comparison with room temperature, which is the highest thermal charge stability reported for triboelectric polymers. Therefore, this BaTiO 3 ‐doped F‐PI has great application prospects for energy generation and motion detection in hot wind tunnel and many other harsh environments.

Studying the droplet sliding velocity and charge transfer at a liquid–solid interface

The relationship between the sliding speed, concentration of moving droplet and transferred charge at a liquid–solid interface, is probed using a droplet triboelectric nanogenerator.

Structures of Planar Defects in ZnO Nanobelts and Nanowires

Extended abstract of a paper presented at Microscopy and Microanalysis 2009 in Richmond, Virginia, USA, July 26 – July 30, 2009

ChemInform Abstract: Kinetically Controlled Growth and Shape Formation Mechanism of Platinum Nanoparticles.

Abstract ChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 100 leading journals. To access a ChemInform Abstract of an article which was published elsewhere, please select a “Full Text” option. The original article is trackable via the “References” option.

A compressed multiple feature and adaptive scale estimation method for correlation filter-based visual tracking

The core part of the popular tracking-by-detection trackers is the discriminative classifier, which distinguishes the tracked target from the surrounding environment. Correlation filter-based visual tracking methods have the advantage of computing efficiency over the traditional methods by exploiting the properties of circulant matrix in learning process, and the significant progress in efficiency has been achieved by making use of the fast Fourier transform at detection and learning stages. But most existing correlation filter-based approaches are mainly restricted to translation estimation, which are susceptible to drifting in long-term tracking. In this article, a compressed multiple feature and adaptive scale estimation method is presented, which uses multiple features, including histogram of orientation gradients, color-naming, and raw pixel value to further improve the stability and accuracy of translation estimation. And for the scale estimation, another correlation filter is trained, which uses the compressed histogram of orientation gradients and raw pixel value to construct a multiscale pyramid of the target, and the optimal scale is obtained by exhaustively searching. The translation and scale estimation are unified with an iterative searching strategy. Extensively experimental results on the benchmark data set of scale variation show that the performance of the proposed compressed multiple feature and adaptive scale estimation algorithm is competitive against state-of-the-art methods with scale estimation capabilities in terms of robustness and accuracy.

Study on the correlation between surface energy andtribological property of silicon-nitride films

Research on Application of Project-Based Learning——Taking Banquet Design of the Vocational College as an Example

The article chose two classes as experimental object to find the effect of project-based teaching applied in Banquet Design.Through sample testing,projects designing,the article analyzes the students' performance and learning interest by the way of test and questionnaire survey.Finally,finding that through the way of project-based teaching,the students become much more interesting in Banquet Design.

Ordered zinc-vacancy induced Zn0.75Ox nanophase structure

Passive Monitoring to Active Regulation: Closed-Loop Piezoelectric Theranostic Platform Enabling On-Demand Vagus Stimulation for Terminating Inappropriate Sinus Tachycardia

Inappropriate sinus tachycardia (IST), characterized by unexplained acceleration of sinus rhythm, poses significant diagnostic and therapeutic challenges due to its paroxysmal and limited treatment options. This study proposes a closed-loop theranostic platform (TP-IST) based on an implantable piezoelectric fiber patch (iPFP) for on-demand vagus nerve stimulation for real-time monitoring of heartbeat and terminating IST, achieving a shift from traditional passive monitoring to revolutionary active regulation. Due to the enhanced piezoelectric response of the hot-press-treated piezoelectric fibers, the iPFP exhibits outstanding sensing performance, which can capture the heartbeats and generate synchronized electrical signals. The implantable real-time transceiver (iRT) processes electrical signals and releases vagus nerve stimulation on demand to terminate tachycardia. Prolonged TP-IST intervention inhibits the function and neural activity of the right stellate ganglion (RSG) by downregulating the expression of c-fos and nerve growth factor (NGF) in the sympathetic neurons, thus attenuating the severity of sympathetic-induced IST. Biocompatibility assessments confirm minimal cytotoxicity (cell viability >90%) and negligible tissue inflammation postimplantation. Experimental results in the large animal model suggest that the developed TP-IST exhibits excellent effectiveness and safety in terminating IST. This work is expected to enrich the treatment of cardiac arrhythmia and provide innovative guidance for cardiovascular disease management.

Basic Kinematic Electron Diffraction

Interfacial Structure and Defects in GaN/AlGaN Heterojunction Epitaxially Grown on LiGa02 Substrate by Molecular Beam Epitaxy

Abstract The performance of III-Nitride based Light Emitting Diodes (LEDs), LASERs, GaN/AlGaN MODFETs (Modulation-doped Field Effect Transistors) and HEMTs (High Electron Mobility Transistors) have been improved dramatically over the past few years [1,2], despite the relatively poor material quality of GaN, as compared to GaAs, for example. The intrinsic properties of the materials system make it extremely well suited to both optoelectronic and microwave power transistor applications. Typically, GaN is grown on substrates such as GaAs, Al2O3 (sapphire) or SiC with large lattice mismatch. This has usually resulted in an extremely high defect density in the GaN layer. The growth of GaN on lithium gallate LiGaO2 (LGO) affords many advantages compared to all other available substrates. LGO offers the smallest average lattice mismatch of any available substrate for the Ill-nitrides. This facilitates the growth of high quality GaN directly on Lithium Gallate without the need for a defective buffer to decouple the strain associated with the large lattice mismatch of other substrates [3].

Carrier recombination in clusters of NiO

Piezotronic Effect Enhanced Flexible Humidity Sensing of Monolayer MoS₂

We report the piezotronic effect on the performance of humidity detection based on a back-to-back Schottky contacted monolayer MoS2 device. By introducing an upswept mechanical strain, the in-plane electrical polarization can be induced at the MoS2/metal junction region. The polarization charges can modify the Schottky barrier height at the interface of MoS2/metal junction, subsequently improving the sensitivity of the humidity sensing. An energy band diagram is proposed to explain the experiment phenomenon of the humidity sensor. This work provides a simple way to enhance the sensitivity of ultrathin two-dimensional-materials-based sensors by the piezotronic effect, which has great potential applications in electronic skin, human-computer interfacing, gas sensing, and environment monitoring.