二维层状材料的透射电子显微镜原位表征与操纵

研究论文
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"这篇研究论文深入探讨了二维层状材料，特别是那些超越石墨烯的新型超薄材料在电子显微镜下的原位表征与操纵。这些二维材料因其丰富的物理性质和独特的层状结构，展现出巨大的潜力，在电子、化学、能源以及生物科学等领域有广泛应用。了解2D层状材料的结构、化学组成与其物理性质之间的相互作用机制对于基础纳米科学研究和下一代纳米器件的实际制造至关重要。 透射电子显微镜（TEM）凭借其高空间分辨率和多样化的外部场应用，成为原子尺度上对纳米材料和纳米器件进行静态表征和动态操纵的强大工具。近年来，薄膜技术和精密微电子机械系统（MEMS）技术的进步使得二维层状材料和纳米器件能够在TEM环境下进行更精细的研究和操作。 论文详细介绍了TEM技术如何用于揭示这些材料的结构细节，包括晶格结构、缺陷分布以及界面特性，并讨论了如何通过TEM实现对材料的精确操纵，如层间堆叠顺序的改变、缺陷修复或功能化。此外，文章还可能涵盖了在外部电场、磁场或温度变化下，2D材料的动态响应和性能调控。 通过对这些二维材料的原位观察，科学家能够实时监测材料在各种环境条件下的行为，从而对材料的稳定性、机械柔韧性和电子传输特性等关键属性有更深入的理解。这种理解对于优化材料性能、设计新的纳米器件架构以及开发新的功能化应用具有重要意义。 这篇论文全面概述了TEM技术在研究和操控二维层状材料方面的最新进展，强调了这些技术在推动纳米科学和下一代技术发展中的核心作用。" 该研究论文不仅提供了一种理解2D材料的新视角，还展示了TEM技术在纳米尺度研究中的重要性，对于从事材料科学、纳米技术以及电子器件研发的科研人员来说，是极其宝贵的参考资料。

In situ growth of CuO nanoparticles on graphene matrix as anode material for lithium-ion batteries

2021-02-20 上传
CuO nanoparticles are directly formed on graphene nanosheets through the in situ chemical decomposition of Cu(NO3)(2)center dot 3H(2)O and are anchored tightly on the graphene surface. The lithiation-...

请翻译：The fabrication process of inverted pyramids on Si surface involved two steps, i.e., diamond tip indentation and selective etching in HF/ HNO3 mixtures. Consider the fabrication process for the inverted triangular pyramids as an example, as demonstrated in Fig. 1a. First, a Berkovich diamond indenter was used for conducting indentation process on an in-situ nanomechanical test system (TI750, Hysitron Inc., USA). Then, the Si wafers with indents were immersed in a mixture of HF and HNO3 solution. As a result, the depth of the indent rapidly increased from ~ 30 to 360 nm after the etching in HF/HNO3 mixtures for 10 s, forming inverted pyramids from indented regions in situ. To demonstrate fabrication flexibility of inverted Si architecture produced by the proposed selective etching, indentation experiments were carried out using a Vickers indenter

2023-02-18 上传
用Berkovich金刚石入射器在原位纳米力学测试系统（TI750，Hysitron Inc.，美国）上进行入射过程，然后将入射后的硅片浸入HF和HNO3混合液中。结果，在HF/HNO3混合液中腐蚀10 s后，入射处的深度会从~ 30 nm迅速增加到...

Please polish the following paragraphs into academic language:Improving the high-temperature mechanical properties of low-activation steels is a frontier topic in nuclear fusion reactor cladding materials. The preparation of ODS low-activation steel by powder metallurgy method is not only complicated, but also has poor processing performance, which makes it difficult to be used in large scale. The high-temperature creep properties and irradiation resistance of CNAs low-activation steels reinforced with nano-MX phase do not reach the level of ODS low-activation steels. It is difficult to effectively control the thermodynamics and kinetics of oxide formation in ODS low-activation steels prepared by melt-casting process, and their tissue uniformity and mechanical properties need to be improved. We propose a new idea of additive manufacturing ODS low-activation steel, using the oxygen atmosphere in the printing process to control the thermodynamic and kinetic processes of oxide formation, so that the active element Ti is oxidized in situ in the matrix to form diffuse titanium oxide with a size of about 10-30 nm, which greatly improves the high-temperature mechanical properties of additive manufacturing low-activation steel, and the 600°C tensile strength is increased from 470 MPa to 660 MPa, which provides a new idea for the integrated preparation of complex components of ODS low-activation steel.

2023-02-15 上传
提高低活化钢的高温力学性能是核聚变反应堆包壳材料的前沿课题。通过粉末冶金法制备ODS低活化钢不仅复杂，加工性能也较差，难以大规模应用。...在熔炼铸造工艺中，难以有效控制ODS低活化钢氧化物形成的热力学和动力学...

翻译：Bioorthogonal catalysis mediated by transition metals has inspired a new subfield of artificial chemistry complementary to enzymatic reactions, enabling the selective labelling of biomolecules or in situ synthesis of bioactive agents via non-natural processes. However, the effective deployment of bioorthogonal catalysis in vivo remains challenging, mired by the safety concerns of metal toxicity or complicated procedures to administer catalysts. Here, we describe a bioorthogonal catalytic device comprising a microneedle array patch integrated with Pd nanoparticles deposited on TiO2 nanosheets. This device is robust and removable, and can mediate the local conversion of caged substrates into their active states in high-level living systems. In particular, we show that such a patch can promote the activation of a prodrug at subcutaneous tumour sites, restoring its parent drug’s therapeutic anticancer properties. This in situ applied device potentiates local treatment efficacy and eliminates off-target prodrug activation and dose-dependent side effects in healthy organs or distant tissues

2023-02-07 上传
过渡金属介导的生物正交催化已经启发了一个新的人工化学子领域，补充了酶反应，使得生物分子或非天然过程中的生物活性剂的选择性标记或合成成为可能。然而，在体内有效部署生物正交催化仍然具有挑战性，因为金属毒性...

Please revise the paper：Accurate determination of bathymetric data in the shallow water zone over time and space is of increasing significance for navigation safety, monitoring of sea-level uplift, coastal areas management, and marine transportation. Satellite-derived bathymetry (SDB) is widely accepted as an effective alternative to conventional acoustics measurements over coastal areas with high spatial and temporal resolution combined with extensive repetitive coverage. Numerous empirical SDB approaches in previous works are unsuitable for precision bathymetry mapping in various scenarios, owing to the assumption of homogeneous bottom over the whole region, as well as the limitations of constructing global mapping relationships between water depth and blue-green reflectance takes no account of various confounding factors of radiance attenuation such as turbidity. To address the assumption failure of uniform bottom conditions and imperfect consideration of influence factors on the performance of the SDB model, this work proposes a bottom-type adaptive-based SDB approach (BA-SDB) to obtain accurate depth estimation over different sediments. The bottom type can be adaptively segmented by clustering based on bottom reflectance. For each sediment category, a PSO-LightGBM algorithm for depth derivation considering multiple influencing factors is driven to adaptively select the optimal influence factors and model parameters simultaneously. Water turbidity features beyond the traditional impact factors are incorporated in these regression models. Compared with log-ratio, multi-band and classical machine learning methods, the new approach produced the most accurate results with RMSE value is 0.85 m, in terms of different sediments and water depths combined with in-situ observations of airborne laser bathymetry and multi-beam echo sounder.

2023-02-18 上传
回答：本文提出了一种基于底部类型自适应的卫星深度测量（BA-SDB）方法，以解决传统卫星深度测量模型中假设底部均匀的局限性以及不能充分考虑影响反射率的干扰因素，如浊度等。通过基于聚类的底部反射率自适应分割，...

用中文总结以下内容： A number of experimental and numerical investigations have been conducted to study the MBPP stack and wavy flow field characteristics with various designs [10,11]. T. Chu et al. conducted the durability test of a 10-kW MBPP fuel cell stack containing 30 cells under dynamic driving cycles and analyzed the performance degradation mechanism [12]. X. Li et al. studied the deformation behavior of the wavy flow channels with thin metallic sheet of 316 stainless steel from both experimental and simulation aspects [13]. J. Owejan et al. designed a PEMFC stack with anode straight flow channels and cathode wavy flow channels and studied the in situ water distributions with neutron radiograph [14]. T. Tsukamoto et al. simulated a full-scale MBPP fuel cell stack of 300 cm2 active area at high current densities and used the 3D model to analyze the in-plane and through-plane parameter distributions [15]. G. Zhang et al. developed a two-fluid 3D model of PEMFC to study the multi-phase and convection effects of wave-like flow channels which are symmetric between anode and cathode sides [16]. S. Saco et al. studied the scaled up PEMFC numerically and compared straight parallel, serpentine zig-zag and straight zig-zag flow channels cell with zig-zag flow field with a transient 3D numerical model to analyze the subfreezing temperature cold start operations [18]. P. Dong et al. introduced discontinuous S-shaped and crescent ribs into flow channels based on the concept of wavy flow field for optimized design and improved energy performance [19]. I. Anyanwu et al. investigated the two-phase flow in sinusoidal channel of different geometric configurations for PEMFC and analyzed the effects of key dimensions on the droplet removal in the flow channel [20]. Y. Peng et al. simulated 5-cell stacks with commercialized flow field designs, including Ballard-like straight flow field, Honda-like wavy flow field and Toyota-like 3D mesh flow field, to investigate their thermal management performance [21]. To note, the terms such as sinusoidal, zig-zag, wave-like and Sshaped flow channels in the aforementioned literatures are similar to the so called wavy flow channels in this paper with identical channel height for the entire flow field. The through-plane constructed wavy flow channels with periodically varied channel heights are beyond the scope of this paper [22,23].

2023-02-10 上传
通过实验和数值计算研究了MBPP及波浪流动场特性的不同设计（10，11），Chu等人进行了包含30个电池的10 kW MBPP燃料电池堆的耐久性测试，分析了性能退化机制（12），Li等人从实验和模拟两个方面研究了316不锈钢薄金属...

Consider defining a bean of type 'com.situ.mall.admin.service.UserService' in your configuration.

2023-09-12 上传
To define a bean of type 'com.situ.mall.admin.service.UserService' in your configuration, you can use the @Bean annotation in Java configuration or the corresponding XML configuration. In Java ...

Annotation of spatially resolved single-cell data with STELLAR

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resolved Transcriptomics with Ellipsoid Decomposition and Latent Actualization for Reconstruction) is a computational tool developed by researchers at the Broad Institute of MIT and Harvard for ...

ISH-based mouse visual cortex STARmap dataset

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These genes are involved in a variety of biological processes, including synaptic transmission, neurotransmitter signaling, and neurodevelopment. The data can be used to identify cell types, gene ...

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IFISH 是 "in situ fluorescence hybridization" 的缩写，它结合了 "in situ hybridization" 和 "fluorescence microscopy" 的原理，可以用来探测染色体上的特定基因或序列，并对其进行定位和分析。IFISH 技术在医学...
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