无人直升机双模式地面操控系统设计

针对无人直升机遥控系统的特点,设计了一种双模式地面操控系统,讨论了该系统的总体设计和组成,并对其主要组成的操纵输入单元、传感器与传输介质、DGPS定位系统、数据采集处理单元和遥控发射单元的设计进行详细的阐述,最后分析并讨论了遥控数据抖动问题及其解决方法。测试表明本系统操纵简捷,遥控数据稳定,满足无人直升机遥控系统的要求。     

燃气高温梭式窑在艺术陶瓷创作中的应用及烧成操作

随着陶瓷艺术教育在各大、专院校的兴起,高温梭式窑也成为高校艺术陶瓷创作中常用的教学、科研设备。本文结合陶艺教育需求及陶瓷艺术瓷烧成特点,对高温燃气梭式窑炉的烧成操作以及窑炉日常管理维护作了较为系统的阐述。     

数字技术在光学全息领域的应用与前景展望

光全息术与数字技术相结合产生了数字全息显示技术 ,在全息仿真显示及虚拟景物显示方面取得了新的突破。本文简要介绍了数字全息显示技术的发展现状及前景展望     

Review of graphical notations for specifying direct manipulation interfaces

At the early stage of interface design, the designer requires models and notations that can assist with reasoning and the exploration of ideas, and which are unconstrained by implementation issues. The review focuses on graphical notations for specifying the underlying behaviour of direct manipulation interfaces. Parallels are drawn with the requirements of notations employed in the more general areas of system requirements specifications. A number of existing graphical notations are compared and contrasted through a common example drawn from the Macintosh interface, and the required scope of an ideal notation for describing the behaviour of direct manipulation interfaces is defined.     

提高精锌一级品率的技术改造与生产实践

文章介绍了小型简易精馏炉的生产过程和工艺要求,结合生产实际提出了改进方案,在生产中实施后取得了良好效果,精锌一级品率从89.44%提高至92.90%.     

Achieving Superior Thermoelectric Performance in Ge4Se3Te via Symmetry Manipulation with I–V–VI2 Alloying

Although orthorhombic GeSe is predicted to have an ultrahigh figure of merit, ZT ≈ 2.5, up to now, the highest experimental value is ≈0.2 due to the low carrier concentration (n_H ≈ 10¹⁸ cm⁻³). Improving symmetry is an effective approach for enhancing the ZT of GeSe-based materials. With Te-alloying, Ge₄Se₃Te displays the two-dimensional hexagonal structure and high n_H ≈ 1.23 × 10²¹ cm⁻³. Interestingly, Ge₄Se₃Te transformed from the hexagonal into the rhombohedral phase with only ≈2% I–V–VI₂-alloying (I = Li, Na, K, Cu, Ag; V = Sb, Bi; VI = Se, Te). According to the calculated results of Ge_0.82Ag_0.09Bi_0.09Se_0.614Te_0.386 single-crystal grown via AgBiTe₂-alloying, it exhibits a higher valley degeneracy than the hexagonal Ge₄Se₃Te. For instance, AgBiTe₂-alloying induces a strong band convergence and band inversion effect, resulting in a significantly enhanced Seebeck coefficient and power factor with a similar n_H from 17 µV K⁻¹ and 0.63 µW cm⁻¹ K⁻² for pristine Ge₄Se₃Te to 124 µV K⁻¹ and 5.97 µW cm⁻¹ K⁻² for 12%AgBiTe₂-alloyed sample, respectively. Moreover, the sharply reduced phonon velocity, nano-domain wall structure, and strong anharmonicity lead to low lattice thermal conductivity. As a result, a record-high average ZT ≈0.95 over 323–773 K with an excellent ZT ≈ 1.30 is achieved at 723 K.     

The Effect of Inclusion of Naked Oats in the Concentrate Offered to Dairy Cows on Milk Production,Milk Fat Composition and Properties

Dairy cows in early or mid-lactation were offered naked oats- or barley-based concentrates in addition to ad libitum access to grass silage in a continuous design experiment of 10 weeks duration. Concentrates were formulated on an isonitrogenous basis and contained either 500 g barley or 565 g naked oats kg⁻¹ concentrates as the principal energy source in the concentrate. Concentrate type had no effect on silage intake, milk yield or milk protein concentration. However, nitrogen and modified acid detergent fibre digestibility were significantly reduced by inclusion of naked oats and this was reflected in a significant reduction in milk fat concentration. Milk fat from early lactation cows on the naked oats diet contained the highest proportion of unsaturated and the lowest proportion of saturated fatty acids. Sensory and instrumental analyses determined that this milk fat produced the softest, most spreadable butter. This was supported by solid fat content results. The degree of change in milk fat composition due to diet was similar irrespective of stage of lactation but milk fat compositions with the control treatment differed with stage of lactation. Dietary effects were established by the end of the first week of the trial and persisted for the 10-week trial period.     

An Origami Playing Simulator in the Virtual Space

A virtual manipulation system for origami (paper folding) is described. A piece of paper defined in a computer can be deformed interactively by picking and moving a corner vertex of a paper face on a graphic screen using a mouse. Three kinds of folding operations and a curving operation transform the paper into a three-dimensional figure made of flat or curved surfaces. The roundness of the curved surfaces is calculated in real-time by minimizing an elastic energy function. The simulated paper has traditional Japanese decoration applied as a texture to give a more realistic appearance. It is rendered with shading in real-time.     

高频高场电子顺磁共振技术在自旋量子态研究中的应用

电子顺磁共振(EPR)技术是研究具有未成对电子的顺磁性物质的电子结构与动力学信息的有效分析方法,广泛应用于 生物医药、化学、材料科学、辐射检测与量子信息处理等领域。 与传统的 X 波段(9. 5 GHz)EPR 相比,高频 EPR 具有更高的分 辨率、灵敏度与初始化效率等诸多优势,在研究分子中电子自旋的量子性质方面具有重要应用价值。 简要介绍了高频高场电子 顺磁共振技术的发展、原理、特点与仪器构造等,重点介绍了其在自旋量子态研究中的应用,并对其未来进行了展望。 高频高场 电子顺磁共振技术可详细表征分子中电子自旋的磁能级结构并对其进行高效精准的量子相干操控,进一步可演示量子算法与 逻辑门等。