Ternary Ta2NiSe5 Flakes for a High‐Performance Infrared Photodetector

Multielemental systems enable the use of multiple degrees of freedom for control of physical properties by means of stoichiometric variation. This has attracted extremely high interest in the field of 2D optoelectronics in recent years. Here, for the first time, multilayer 2D ternary Ta₂NiSe₅ flakes are successfully fabricated using a mechanical exfoliation method from chemical vapor transport synthesized high quality bulk and the optoelectronic properties are systematically investigated. Importantly, a high responsivity of 17.21 A W^?1 and high external quantum efficiency of 2645% are recorded from an as‐fabricated photodetector at room temperature in air; this is superior to most other 2D materials‐based photodetectors that have been reported. More intriguingly, a usual sublinear and an unusual superlinear light‐intensity‐dependent photocurrent are observed under air and vacuum, respectively. These excellent and special properties make multilayer ternary Ta₂NiSe₅ a highly competitive candidate for future infrared optoelectronic applications and an interesting platform for photophysics studies.     

Design of a Concentration Solar Thermoelectric Generator

Thermoelectric technology can be another direct way to convert solar radiation into electricity, using the Seebeck effect. Herein, a prototype concentration solar thermoelectric generator (CTG) and a discrete numerical model for the evaluation of the whole system are presented. The model takes into account the temperature dependence of the thermoelectric material properties by dividing the thermoelectric leg into finite elements and is proved to be more accurate for calculation of the conversion efficiency of the thermoelectric modules when large temperature gradients occur in the CTG system. Based on the best available properties of various bulk thermoelectric materials reported in the literature, the best possible performance of the CTG system is predicted, and the CTG system design, including the selection of the concentration ratio and the cooling method for different thermoelectric materials, are discussed in detail.     

列阵式密封小型TEACO_2激光器

本文报道一种新型列阵式密封小型TEACO_2激光器。该器件不仅可获得多光束输出,而且利用它进行多种形式的组合,可得到具有各种高质量的激光输出,在许多领域有着广泛的应用潜力。     

有机锡类农药——三唑锡液相色谱分析

用高效液相色谱分析农药三唑锡,采用强阳离子交换柱,甲醇、水、冰醋酸作流动相以及紫外检测器。结果表明,此法分离效果好,准确度和精密度高,可用于三唑锡生产控制及原药、各种制剂(粉剂、胶悬剂)产品分析。     

涂层转移法精密铸造技术在子午线轮胎模具制造中的应用

子午线轮胎模具计算机辅助快速制造系统是由ＣＡＤ技术、快速成型技术、涂层转移法精密铸造技术、材料技术等多项高新技术组合而成的一项独特的先进制造技术。该系统充分利用液态材料成型任意性和高再现性的特点，具有适应性强、重复性好、加工周期短、制造成本低的特点。     

Melting and solidification properties of the nanoparticles of Sn3.0Ag0.5Cu lead-free solder alloy

The Sn3.0Ag0.5Cu (wt.%) lead-free solder alloy is considered to be one of the most promising candidates to replace the traditionally used Sn–Pb solder. However, this alloy composition has some weaknesses, mainly as a result of its higher melting temperature compared to the eutectic Sn–Pb solder. In this paper, lead-free solder alloy nanoparticles of Sn3.0Ag0.5Cu were synthesized by chemical reduction with NaBH₄ as reducing agent. The experimental results indicated that the major particle size of Sn3.0Ag0.5Cu nanoparticles was smaller than 100 nm. The melting and solidification properties of the Sn3.0Ag0.5Cu nanoparticles were studied by differential scanning calorimetry at different scanning rates. It was evidenced by the differential scanning calorimetry curves that the melting temperature of Sn3.0Ag0.5Cu nanoparticles was lower than that of the bulk alloy. In addition, the undercooling of the Sn3.0Ag0.5Cu nanoparticles was in the range of 82.0–88.5 °C at different cooling rates, which was much larger than that of the Sn3.0Ag0.5Cu micro-sized particles, showing stronger cooling rate dependence.     

Crystal orientation dependence of the out-of-plane dielectric properties for barium stannate titanate thin films

The orientation-dependent out-of-plane dielectric properties of barium stannate titanate (Ba(Sn_0.15Ti_0.85)O₃ (BTS)) thin films prepared by sol–gel method were investigated. Films with (1 0 0), (1 1 0), and (1 1 1) orientation were grown on LaNiO₃-buffered (1 0 0), (1 1 0), and (1 1 1) LaAlO₃ (LAO) single-crystal substrates, respectively. The different temperature of the dielectric constant maximum (T_m) of the BTS thin films with different orientation was believed to be attributing to stress inside the films. Films with the (1 1 1) orientation had higher relative dielectric constant and tunability than (1 0 0)- and (1 1 0)-oriented films. This difference in dielectric properties in these three kinds of oriented BTS films may be attributed to change in the direction and magnitude of electric polarization in orientation engineered BTS films and stress in the films.     

MoO3–x QDs/MXene (Ti3C2Tx) self-assembled heterostructure for multifunctional application with antistatic,smoke suppression,and antibacterial on polyester fabric

Journal of Materials Science - The exploration of novel and multifunctional coatings through composite nanomaterials design is crucial for developing next-generation polyester fabrics. Herein, we...     

基于螺管形差动变压器的非接触式扭矩传感器的研究

扭矩测量是传动线路中的重要内容之一,高精度、高稳定性的非接触式扭矩测量方法是当今各国机械量测量研究的热点之一,为此,提出了一种基于螺管形差动变压器的非接触式扭矩传感器的研究.系统介绍了该测量方法的原理与结构.经实验证实:该测量原理可行,所设计的扭矩传感器具有较好的线性度和一致性,重复精度0.5%.     

不同Waxy蛋白亚基缺失小麦材料的籽粒性状和面团流变学特性的比较

普通六倍体小麦中存在为数不多的自然突变的Waxy蛋白亚基缺失小麦材料。选用自然突变形成的4种缺失1个或2个Waxy蛋白亚基的部分糯小麦材料,2种Waxy蛋白亚基全缺失的糯小麦品系,以普通中筋小麦济麦19作为对照,研究其籽粒性状和面团的粉质特性、揉混特性、拉伸和黏度特性。结果表明,糯小麦的籽粒硬度、直链淀粉含量与其他小麦相比明显偏低;部分糯小麦的直链淀粉含量比对照有不同程度的降低。面团的粉质特性、揉混特性和拉伸特性测定表明,糯小麦面团的吸水率极显著高于其他小麦,其稳定时间、断裂时间,揉混特性的中线峰值时间、峰值面积、8min尾高,拉伸特性的最大拉伸阻力、拉伸曲线面积、最大拉伸比显著低于对照,而部分糯小麦（江苏白火麦除外）的粉质参数（吸水率除外）、揉混参数、最大拉伸阻力、最大拉伸比均高于对照,达显著或极显著水平。黏度特性上,糯小麦的面团黏度、附着功、黏聚性较大,部分糯小麦（江苏白火麦除外）的面团黏度较小,均呈显著或极显著性差异。综合面团的流变学特性测定表明,糯小麦面粉的吸水率高,但面团的结构差,筋力弱;Sturdy、Satanata和IKE3个部分糯小麦的面团的耐揉性、耐搅性、面团筋力优于济麦19,也优于糯小麦;缺失Wx—D1亚基的江苏白火麦的大多数面团流变学参数与糯小麦无显著性或极显著性差异。