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Pattern Recognition for the Electronic Phase of Bismuth Antimony Thin Films 铋锑薄膜电子相的模式识别
Pub Date : 2022-01-15 DOI: 10.30919/esmm5f661
Shuangxi Tang, Lucy Dow, Emmanuel C. Ojukwu
There are many applications involving the use of bismuth antimony thin films. However, due to the low crystalline symmetry and strong coupling between the electronic band edges, it has always been challenging to infer the electronic phase of such a material. Fortunately, with the development of pattern recognition technology, scientists can build many black-box tools for predicting various materials properties. In this present work, we have developed several pattern recognition tools to predict the electronic phase of a bismuth antimony thin film. The support vector machine, the decision tree, and the artificial neural network are used to achieve a prediction accuracy of ~90%, ~95% and ~100%, respectively.
铋锑薄膜有许多应用。然而,由于低晶体对称性和电子带边缘之间的强耦合,推断这种材料的电子相位一直是具有挑战性的。幸运的是,随着模式识别技术的发展,科学家们可以建立许多黑箱工具来预测各种材料的性质。在目前的工作中,我们开发了几种模式识别工具来预测铋锑薄膜的电子相。采用支持向量机、决策树和人工神经网络分别实现了~90%、~95%和~100%的预测精度。
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引用次数: 0
Prospective Photovoltaic-Thermoelectric Hybrid System 未来的光电热电混合系统
Pub Date : 2022-01-01 DOI: 10.30919/esmm5e606
G. Min
Photovoltaic-thermoelectric (PV-TE) hybrid system is an appealing idea due to its potential to harvest thermal energy produced in photovoltaic conversion process or mitigate the temperature effect through cooling. The rationale for developing PV-TE hybrid system is illustrated in Fig. 1, which depicts three possible strategies that might lead to a higher overall efficiency of the hybrid system than that of photovoltaic system alone. In strategy (a), thermoelectric device is used as a cooler that is in direct contact with the solar cells. Since the solar cells exhibit negative temperature coefficient, reducing the operating temperature of the solar cells could lead to an increase in the power output of the solar cell. In strategy (b), thermoelectric device is arranged in similar manner as strategy (a) but used as a thermoelectric generator. Thermalisation loss inside solar cells will lead to an increase in the temperature of the solar cells, which in turn establishes a temperature difference across the thermoelectric generator. As a result, the waste thermal energy from the solar cell can be utilised by thermoelectric generator to convert into useful electric power. In strategy (c), the solar energy in infrared spectrum, which has no use to solar cells, is separated from the visible spectrum and directed to a thermoelectric generator for power generation. Clearly, these strategies are built on the sound scientific rationales. The key question is if they will lead to a realistic improvement when other influences are taken into consideration. This paper aims to offer critical assessments on the prospect in these research directions.
光伏-热电(PV-TE)混合系统是一个很有吸引力的想法,因为它有可能收集光伏转换过程中产生的热能或通过冷却来减轻温度效应。开发PV-TE混合系统的基本原理如图1所示,图1描述了三种可能的策略,这些策略可能导致混合系统的整体效率高于单独的光伏系统。在策略(a)中,热电装置用作直接与太阳能电池接触的冷却器。由于太阳能电池表现为负温度系数,降低太阳能电池的工作温度可以导致太阳能电池输出功率的增加。在策略(b)中,热电装置以与策略(a)相似的方式布置,但用作热电发电机。太阳能电池内部的热化损失将导致太阳能电池温度的增加,这反过来又在热电发电机上建立了温差。因此,来自太阳能电池的废热能可以被热电发电机利用,转化为有用的电能。在策略(c)中,将对太阳能电池毫无用处的红外光谱太阳能从可见光谱中分离出来,引导到热电发电机中发电。显然,这些策略是建立在合理的科学基础之上的。关键的问题是,当考虑到其他影响时,它们是否会导致现实的改善。本文旨在对这些研究方向的前景进行批判性评价。
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引用次数: 6
Recent Progress on Optical Frequency Conversion in Nonlinear Metasurfaces and Nanophotonics 非线性超表面光学频率转换与纳米光子学研究进展
Pub Date : 2022-01-01 DOI: 10.30919/esmm5f655
Chen Wang, Y. Wen, Jingbo Sun, Ji Zhou
Frequency conversions, such as second harmonic generation (SHG), third harmonic generation (THG), high harmonic generation (HHG), and wave mixing, are typical processes in nonlinear optics, which have a wide range of applications in new light sources, bioimaging and sensing, quantum optics, and holography. To engineer and manipulate these nonlinear optical processes, metasurfaces and nanophotonic structures have been introduced, which have been successfully demonstrated as powerful tools to tailor the key features of light and excite the extraordinary phenomena in linear optics. In this review, we highlight the recent progress on frequency conversion in plasmonic metasurfaces, all-dielectric metasurfaces as well as other nanophotonic structures, ranging from SHG, THG to HHG and wave mixing. The origin of optical nonlinearity and its coupling with subwavelength resonators are discussed, which fundamentally determine the conversion efficiency and functionality. Finally, we summarize the challenges that nonlinear metasurfaces and nanophotonics now face and offer an outlook on further development and application potential.
二次谐波产生(SHG)、三次谐波产生(THG)、高次谐波产生(HHG)、波混频等频率转换是非线性光学中的典型过程,在新型光源、生物成像与传感、量子光学、全息等领域有着广泛的应用。为了设计和操纵这些非线性光学过程,超表面和纳米光子结构已经被引入,它们已经成功地被证明是定制光的关键特征和激发线性光学中非凡现象的有力工具。本文综述了等离子体超表面、全介质超表面以及其他纳米光子结构的频率转换研究进展,包括SHG、THG、HHG和波混频。讨论了光学非线性的来源及其与亚波长谐振腔的耦合,这从根本上决定了转换效率和功能。最后,总结了非线性超表面和纳米光子学目前面临的挑战,并对其进一步发展和应用前景进行了展望。
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引用次数: 3
Investigation on Crack Recovery Behavior of Engineered Cementitious Composite (ECC) Incorporated Memory Alloy Fiber at Low Temperature 工程胶凝复合材料(ECC)复合记忆合金纤维低温裂纹恢复行为研究
Pub Date : 2022-01-01 DOI: 10.30919/esmm5f662
Mengfan Song, Jinbang Wang, Lianwang Yuan, Congqi Luan, Zonghui Zhou
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引用次数: 20
The Post-treatments of Aluminum Oxynitride(AlON) Powders Synthesized by the Carbothermal Reduction and Nitriding Process 碳热还原氮化法合成氮化铝(AlON)粉末的后处理
Pub Date : 2021-10-04 DOI: 10.30919/esmm5f542
Yingying Chen, Qing-gang Li, Zhi Wang, G. Shi, J. Wu, Mengyong Sun
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引用次数: 0
Flexible Ethylene-vinyl Acetate Copolymer/Fluorographene Composite Films with Excellent Thermal Conductive and Electrical Insulation Properties for Thermal Management 柔性乙烯-醋酸乙烯共聚物/氟石墨烯复合薄膜具有优异的导热和电绝缘性能,用于热管理
Pub Date : 2021-09-09 DOI: 10.30919/esmm5f523
He Han, Haoyang Sun, Fan Lei, Jintao Huang, S. Lyu, Bangyao Wu, Meng Yang, Chentao Zhang, An Li, Zhi Zhang, D. Sun
With electronic equipment becoming more integrated, multifunctional, and lightweight, the demand for advanced thermal management materials with excellent electrical insulation and high thermal conductivity is increasing. In this study, the fluorographene (FG) nanosheets with different degrees of fluorination were successfully exfoliated from the corresponding raw graphite fluoride by using a facile low-energy ball milling process and ultrasonic treatment. And then ethylene vinyl acetate copolymer/fluorographene (EVA/FG) composite films were prepared by a knife coating method. The effects of fluorination degree and content of FG on the thermal conductivity and electrical insulation of FG composites were systematically studied. An in-plane thermal conductivity of 52.9 W m -1 K -1 and through-plane thermal conductivity of 2.5 W m -1 K -1 has been achieved in the prepared composite films with the FG content of 70 wt% and the C:F ratio of 1:0.63. The prepared composite films also show excellent thermal stability to withstand repeated cooling and heating, as well as high electrical insulation and good flexibility, which makes the FG composites of great potential usage in the field of intelligent wearable devices, soft robots, flexible electronics, and so on.
随着电子设备的集成化、多功能化和轻量化,对具有优良电绝缘性和高导热性的先进热管理材料的需求日益增加。本研究采用简易低能球磨工艺和超声波处理,成功地从相应的氟化石墨原料上剥离出不同氟化程度的氟化石墨纳米片。然后采用刀涂法制备了乙烯醋酸乙烯共聚物/氟石墨烯(EVA/FG)复合薄膜。系统研究了氟化程度和FG含量对FG复合材料导热性和电绝缘性的影响。制备的FG含量为70 wt%, C:F比为1:0.63的复合膜,面内导热系数为52.9 W m -1 K -1,通面导热系数为2.5 W m -1 K -1。制备的复合薄膜还表现出优异的热稳定性,可以承受反复冷却和加热,同时具有较高的电绝缘性和良好的柔韧性,这使得FG复合材料在智能可穿戴设备、软机器人、柔性电子等领域具有很大的应用潜力。
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引用次数: 23
High-Precision Three-Dimensional Printing in a Flexible, Low-Cost and Versatile Way: A Review 灵活、低成本、多用途的高精度三维打印技术综述
Pub Date : 2021-09-09 DOI: 10.30919/esmm5f526
Jianming Yang, Bin Zhou, Dongxiao Han, Ningxin Cui, Bo Li, Jun Shen, Zhihua Zhang, Ai Du
High-precision three-dimensional (3D) printing for fabricating the arbitrarily, complex 3D microstructures with a resolution of a few microns or below are attractive across a broad range of applications. Advances have been made in the field of highprecision 3D printing, however, there are still many challenges and drawbacks that need to be overcome in order to print high-precision and high-quality 3D microstructures in a relatively flexible, low-cost and versatile way. This review summarizes some promising high-precision 3D printing technologies, including direct ink writing (DIW), two-photon polymerization (TPP), and electrochemical fabrication (EFAB). Herein, we mainly focus on the materials used in high-precision 3D printing and their applications reported so far. At the same time, we also put forward a comprehensive view of their developments and challenges, which providing a benchmark for future research and development of high-precision 3D printing technologies.
高精度三维(3D)打印用于制造任意复杂的3D微结构,分辨率为几微米或更低,在广泛的应用中具有吸引力。虽然高精度3D打印技术已经取得了一定的进展,但要想以相对灵活、低成本和多用途的方式打印出高精度、高质量的3D微结构,仍然存在许多挑战和缺陷需要克服。本文综述了一些有前途的高精度3D打印技术,包括直接墨水书写(DIW)、双光子聚合(TPP)和电化学制造(EFAB)。本文主要对目前报道的用于高精度3D打印的材料及其应用进行了综述。同时,我们也对它们的发展和面临的挑战提出了全面的看法,为未来高精度3D打印技术的研发提供了一个标杆。
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引用次数: 16
Physico-chemical Characteristics of Amino Acids in Aqueous Solution of Amikacin Sulphate 硫酸阿米卡星水溶液中氨基酸的物理化学特性
Pub Date : 2021-08-03 DOI: 10.30919/esmm5f502
P. Chaudhary, S. Chauhan, Vivek Sharma, Kuldeep Singh, Ahmad Umar
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引用次数: 0
Progress on Very/Ultra Low Frequency Mechanical Antennas 甚低频/特低频机械天线研究进展
Pub Date : 2021-07-31 DOI: 10.30919/esmm5f497
Shaolong Yang, Beijing China Telecommunications, Jianchun Xu, Menghao Guo, Bokun Zhang, Chuwen Lan, Haihong Li, Ke Bi
Mechanical antennas have attracted wide attention due to their outstanding properties of ultra small size and low power in existing long wave communications. Here, a review of progress on mechanical antennas used in very low frequency (VLF: 3 30 kHz) and ultra low frequency (ULF: 0.3 3 kHz) is presented. The topic of focus is on the performance analysis of permanent magnet-based and piezoelectric mechanical antennas, including both radiation mechanism and signal modulation. Moreover, basic mechanical antennas are generally classified in detail, and the radiation performance of various schemes is compared. It concludes the up-to-date progress on the mechanical antennas for providing a source of inspiration towards the future better outcome of designs and applications.
在现有的长波通信中,机械天线以其超小型、低功耗的优异性能引起了人们的广泛关注。本文综述了超低频(VLF: 3.3 kHz)和超低频(ULF: 0.3 kHz)机械天线的研究进展。本课题重点分析了基于永磁和压电的机械天线的性能,包括辐射机理和信号调制。此外,对基本机械天线进行了详细的分类,并对各种方案的辐射性能进行了比较。它总结了机械天线的最新进展,为未来更好的设计和应用提供了灵感来源。
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引用次数: 9
Chemical Solution Deposition of Sb2Se3 Films to Study Their Structural, Morphological and Optical Properties 化学溶液沉积Sb2Se3薄膜研究其结构、形态和光学性能
Pub Date : 2021-07-17 DOI: 10.30919/esmm5f496
A. Kulkarni, Y. Marathe, P. Patil, Sunil D. Marathe, S. D. Khairnar, H. Pathan, R. Patil
At room temperature chemical solution deposition technique has been employed for the deposition of Sb 2 Se 3 thin films. Solution based deposition of Sb 2 Se 3 crystals with variation in reaction time found to be playing a significant role in controlling the reaction rate during the deposition of Sb 2 Se 3 films. Temporal evolution of structural, morphological and optical properties of deposited Sb 2 Se 3 films were investigated using X-ray diffraction (XRD), scanning electron microscopy and UV-visible spectroscopy, respectively. Solution deposition of Sb 2 Se 3 films involves two steps: initial nucleation and crystal formation followed by growth to form final films. Increased reaction time from 30 to 120 min, deposited films showed morphological evolution for Sb 2 Se 3 nanocrystals from dense spheres to self-assembled flower-like morphology. In addition, optical energy band gap variation from 1.60 to 1.63 eV, suggest the possibility of crystal size optimization with energy band gap tunability of Sb 2 Se 3 crystals in the visible region. This is also evident from the photoluminescence studies, which reveals the luminescence intensity variation with crystal size of Sb 2 Se 3 as a function of deposition time. Optical and morphological response of Sb 2 Se 3 crystals to the reaction conditions suggests it as a suitable and potential candidate for optoelectronic applications such as photovoltaic cells, electronic nano-devices, fuel cells etc .
采用室温化学溶液沉积技术制备了sb2se3薄膜。在s2se - 3薄膜的沉积过程中,s2se - 3晶体的溶液沉积随反应时间的变化对反应速率起着重要的控制作用。采用x射线衍射仪(XRD)、扫描电镜(sem)和紫外可见光谱(UV-visible spectroscopy)对制备的sb2se3薄膜的结构、形貌和光学性能进行了研究。sb2se3薄膜的溶液沉积包括两个步骤:初始成核和晶体形成,然后生长形成最终薄膜。反应时间从30分钟增加到120分钟,制备的sb2se3纳米晶的形貌由致密的球体演变为自组装的花状形貌。此外,在1.60 ~ 1.63 eV的光能带隙变化范围内,表明Sb - 2 - Se - 3晶体在可见光区域的能带隙可调性可以优化晶体尺寸。光致发光研究也证明了这一点,该研究揭示了Sb 2 Se 3的发光强度随晶体尺寸的变化是沉积时间的函数。sb2se3晶体对反应条件的光学和形态学响应表明它是光电应用的合适和潜在的候选者,如光伏电池、电子纳米器件、燃料电池等。
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引用次数: 0
期刊
ES Materials & Manufacturing
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