Ultra-smooth BaTiO3 surface morphology using chemical mechanical polishing technique for high-k metal-insulator-metal capacitors

The surface roughness of barium titanate (BTO) following its implication by aerosol deposition method (ADM), is a very important characteristic affecting its potential for use in high-k metal-insulator-metal capacitors. The ADM is the best candidate to deposit ceramic films but has two major problems: macroscopic defects and rough interface effects on the BTO surface. In this work, a chemical mechanical polishing (CMP) technique is applied to obtain an ultra-smooth BTO surface morphology by the optimization of several factors including the slurry type, the head rotational speed, and the down pressure. Statistically, we were able to achieve a root mean square (RMS) value of the BTO surface of 1.746 nm by utilizing a two-step polishing process, applied at a head rotational speed of 70 rpm under 5 kg/cm² of down pressure; this RMS value is improved at least 8 times over previous studies. This analysis is based on representative pattern images, three-dimensional images, line profiles, histograms, and power spectra of selected BTO surface areas, further verified with data from both energy-dispersive X-ray spectroscopy and X-ray photoelectron spectroscopy.     

Effects of displays on a direct reaching task: A comparative study of head mounted display and stereoscopic widescreen display

This study was conducted to investigate the virtual display effects on direct interaction performance metrics such as accuracy, task completion time, and comfort. Eighteen participants performed tapping (pointing) tasks in the coronal plane by directly reaching for tapping targets at three egocentric distance levels, with three indices of difficulty at each egocentric distance. The position data and severity of cybersickness symptoms were collected with a motion system and a symptom questionnaire, respectively. The results indicated that accuracy was higher with the stereoscopic widescreen display than with the head mounted display. However, no significant differences in task completion time, throughput, and cybersickness were observed between the two VR displays. In addition, increasing the egocentric distance improved accuracy and lengthened the task completion time, whereas increasing the task difficulty lengthened the task completion time but did not affect the accuracy. The findings are important and informative for users in choosing between the two virtual reality displays. Generally, the stereoscopic widescreen display can be recommended for tasks requiring high egocentric distance accuracy in the coronal plane. Furthermore, developers may refer to these findings in designing interfaces that allow a more natural way of interaction for users.     

我国地方绵羊品种与进口羊腿肉的营养质构差异分析

目的分析对比我国不同产区主要地方品种与进口羊腿肉的营养品质与质构差异。方法选取中东部农牧交错带肉羊优势区域主要产区:内蒙古锡林郭勒;西北肉羊优势区域的代表产区:新疆、甘肃和宁夏,以乌珠穆沁羊、滩羊、哈萨克羊3个地方品种为主,同时对比来自澳大利亚和新西兰的进口羊腿,品种分别为澳洲白与无角陶赛特羊。分析羊腿的蛋白、脂肪、脂肪酸及氨基酸、维生素、矿物质含量,以及质构参数。结果澳大利亚羊腿蛋白含量较高;甘肃肃北哈萨克羊脂肪酸组成最优;内蒙古锡林郭勒阿巴嘎旗乌珠穆沁羊的钙、磷、钾含量均较高。结论营养成分受品种、饲养方式、地理环境等综合影响:蛋白含量与品种有关,放牧会增加羊腿中不饱和脂肪酸的含量,地理环境与饲料共同影响羊腿的矿质元素含量特征;口感受饲养方式影响较大,放牧会导致羊肉硬度较高。     

煤矿井下机车运输红尾灯的设计与应用

针对目前矿井机车运输的现状,根据实际情况和需要,依据经济、可靠、实用、操作方便的原则,提出了基于矿灯的列车红尾灯设计与应用,对类似条件下使用列车红尾灯具有一定的参考价值。     

LED在矿灯应用的技术探讨

本文简述LED光源矿灯的发展现状,分析该矿灯的特点,提出发展该技术的主要关键。     

矿灯微机管理系统超市化的应用

矿灯微机管理系统的应用,进行超市化管理,节省了岗位人员,运行状况一目了然,安全高效,是一项值得推广的成功技术。     

延长煤矿矿灯使用寿命的一种实用型电路设计

针对煤矿大多数矿灯没有防止由于过度充电和充电电流过大所引起的矿灯寿命缩短的保护性电路的现状 ,根据现场具体实际情况和需要 ,依据经济、可靠、操作方便的原则 ,采用通用型双运放 35 8或 2 5 8等器件 ,实现了实用型矿灯充电保护器的设计。     

矿用卡车示宽灯改造应用分析

随着露天矿产量及规模不断加大,矿用卡车也越来越大型化,卡车运行管理已成为露天矿生产安全主要方面。由于卡车行驶中盲区较大,且车体较大,尤其夜间作业,存在较大的安全风险,一旦发生安全事故会造成巨大的生命和财产损失。通过对矿用卡车夜间作业状态分析,提出矿用卡车示宽灯改造方案,在哈尔乌素露天煤矿应用实施,有效降低了卡车发生安全事故的概率及维护成本,也为露天矿安全、高效生产提供了保障。     

太阳能低压钠灯电子镇流器设计

基于太阳能光伏技术和低压钠灯的电特性,提出了太阳能低压钠灯电子镇流器的设计方案。实验结果验证了该方案的可行性,并能够取得环保节能的双重效果。     

大气吸收系数的研究与应用

定义了大气吸收系数的概念．通过试验及理论分析．得出我国各地区大气吸收系数推荐值，并时体育场场地照明照皮计算进行修正。