Wang, Dongping; Jin, Kai ; Hu, Chenxuan; Du, Maohua; Belgaid, Yacine ; Shi, Subao; Li, Jiahao; Hu, Siyi; Yu, Jun; Nathan, Arokia; Ma, Hanbin
Digital liquid sample handling is an enabling tool for cutting-edge lifesciences research. Similar to Field Programmable Gate Arrays (FPGA) in Integrated Circuits, we present here an active-matrix thin-film electronicsbased digital microfluidics system, which will be henceforth referred to as Field Programmable Droplets Arrays (FPDA). The system contains 256 × 256 pixels in an active area of 10.65 cm2, which is capable of manipulating thousands of individually addressable liquid droplets simultaneously. By leveraging a customised TFT-based circuit design solution, it becomes possible to programmatically manipulate droplets at the pixel level. The minimum achievable droplet volume is around 0.5 nl, which is two orders of magnitude smaller than the state-of-the-art reported1. The movement of droplets can be either pre-programmed or controlled in real-time. The FPDA system shows great potential of the ubiquitous thin-film electronics technology in digital liquid handling. These efforts will make it possible to create a true programmable lab-on-a-chip device to enable great advances in life science research. |
Large-Bandwidth High-Gain Low-Noise Transimpedance Amplifier for Scanning Tunneling Microscope
Ying-Xin Liang
In this work, a design of large-bandwidth high-gain low-noise transimpedance amplifier (TIA) for scanning tunneling microscope (STM) is proposed. The simulations show that the proposed TIA has the bandwidth higher than 200 kHz, two orders of magnitude higher than those of conventional commercial TIAs for STM. At low frequencies, the noises of the proposed TIA are almost the same as the conventional commercial ones with the same transimpedance gain. At high frequencies, its calculated input equivalent noise voltage power spectral density (PSD) is 40 (nV)2/Hz and its input equivalent noise current PSD is 3.2 (fA)2/Hz at 10 kHz. The corresponding values are 23 (nV)2/Hz and 88 (fA)2/Hz at 100 kHz. The STM with the proposed TIA can meet the needs of fast high-quality STM imaging measurements and fast high-energy-resolution scanning tunneling spectra measurements for the low-conducting materials, such as complex organic systems and wide bandgap semiconductors. |
Ying-xin Liang
An ultra-low-noise large-bandwidth transimpedance amplifier (TIA) for cryogenic scanning tunneling microscope (CryoSTM) is proposed. The TIA connected with the tip-sample component in CryoSTM is called as CryoSTM-TIA. Its transimpedance gain is as high as 1 GΩ, and its bandwidth is over 300 kHz, but its equivalent input noise current power spectral density is less than 4 (fA)2/Hz at 100 kHz. The low inherent noise for the CryoSTM-TIA is due to its special design: (1) its pre-amplifier is made of a pair of low-noise cryogenic high electron mobility transistors (HEMTs); (2) the noise generated by one HEMT is eliminated by a large capacitor; (3) the capacitance of the cable connected the gate of the other HEMT to the tip is minimized; (4) thermal noise sources, such as the feedback resistor, are placed in the cryogenic zone. The dc output voltage drift of the CryoSTM-TIA is very low, as 5 μV/°C. The apparatus can be used for measuring the scanning tunneling differential conductance spectra, especially the scanning tunneling shot noise spectra (STSNS) of quantum systems, even if the shot noise is very low. It provides a universal tool to study various novel quantum states by measuring STSNS, such as detecting the Majorana bound states. |
王彤标; 周舟; 王明章; 田要广; 王刘文; 李海; 潘显威; 杨胜辉; 宋建军
为解决鱼洞河流域废弃煤矿酸性废水外排的问题,针对废弃煤矿酸性废水的成因(煤系地层硫化物、氧化环境、地下水及通道)及废弃煤矿的不同开采情况,分类施策、分部实施,通过对多处废弃煤矿治理经验的总结,提出了一套相对适合该区域实际情况的“追、堵、截、围”的煤矿废水“成因-源头式生态关水污水治理法”,即追索废弃煤矿的巷道分布、封堵关键段、截流地表水、采用帷幕灌浆抬升采空区的水位。该方法的基本原理是改变地表水进入采空区后直接外流的路径,采用巷道封堵、帷幕灌浆等手段隔绝废弃煤矿采空区的氧气,同时抬升地下水位,使顶板含水层逐步恢复到原有状态、使煤矿废水变成深部滞留水、使后续补给水从高位流出。雨季检验结果表明治理效果显著。 |
贾东阁; 郑阳光
循环荷载作用下深厚饱和软黏土的固结与长期沉降变形分析对公路、地铁等基础设施的沉降分析有很重要的意义。传统的固结分析方法无法合理地考虑到长期循环荷载作用下软黏土的蠕变沉降,而基于弹粘塑性的本构模型分析又不能考虑长期循环荷载作用下土体固结过程中渗透系数kv和体积压缩系数mv的非线性变化。本文将综合考虑长期循环荷载作用下饱和软黏土的非线性固结及其固结过程中产生的蠕变。本文构建了一种具有普遍适用性的一维弹黏塑性非线性固结模型,可以较好的计算长期循环荷载作用下考虑蠕变效应的饱和软黏土的长期沉降变形。本文与土工试验相结合,给出了便于应用的模型参数确定方法;并提出了一种多级加载过程中的初始条件确定方法,该方法可以反映出应变和超静孔压在深度上的不均匀性。采用杭州软黏土进行了多组不同振幅不同频率不同动态偏移量的循环荷载固结试验,通过计算结果与试验结果的对比分析,验证了模型的合理性。 |
翁汉琍; 刘华; 林湘宁; 万毅; 李振兴; 黄景光; 鲁俊生
对变压器励磁涌流和故障电流波形整体形态的特征进行分析,利用两者之间相似度差异,结合Hausdorff距离算法在图形相似度方面的优势,构造基于Hausdorff距离算法的变压器差动保护新判据,该判据采用标幺化后的差流序列和标准正弦波序列之间的Hausdorff距离值进行判别,以区分变压器的励磁涌流(包括对称性涌流)和故障差流(包括故障电流叠加励磁涌流)。通过仿真试验验证所提新判据的有效性、快速性和抗干扰性 |
Quanxi Cao; Yuting Chen; Yi Yin
Cultural confidence is one of the important factors to promote the inheritance and development of excellent national culture. Maonan traditional craft contains excellent national culture, cultural customs and so on, which is a part of carrying forward China's traditional culture confidence. From the perspective of cultural confidence, this paper analyzes the characteristics and advantages of the current Maonan traditional crafts and puts forward suggestions to promote the innovative development of Maonan traditional crafts, which can better promote the inheritance and development of Maonan traditional crafts. |
submitted time 2023-01-10 Cooperative journals:《Art & Design Research》 Hits1536, Downloads160, Comment 0
Reform and Exploration of Animation Curriculum System in the Language Environment of Omnimedia
Fanding Gao; Yujun Wang
Driven by the rapid development of omnimedia, the Internet, movies, television, etc. have gradually blend in people’s daily lives, and cartoons are also deeply loved by children. Colleges and universities are an important base for cultivating animation talents, in the process of carrying out animation teaching, due to the short setting up time and other reasons, it is necessary to continuously improve the teaching system of animation professional courses, and comprehensively analyze the current problems in teaching, so as to provide more help for students’ learning and avoid being affected by a variety of factors that lead to the inability to effectively improve teaching efficiency. In the language environment of omnimedia, it is necessary to actively improve the efficiency of animation teaching, optimize the teaching system according to the actual situation, and implement the teaching of all links to maximize the role of curriculum system reform. Based on this, this paper mainly analyzes the importance and necessity of animation curriculum reform in the language environment of omnimedia. |
submitted time 2023-01-10 Cooperative journals:《Art & Design Research》 Hits1478, Downloads171, Comment 0
Study on the Aesthetic Implication of Wooden Architecture of Dong Nationality
Yanmin Liang; Yong Zhang; Mengxia Che
Traditional dwellings with high regional artistic expression, is an important carrier of China's national culture, regional characteristics, ethnic customs. The wooden architecture of the Dong Nationality 's residential houses originated from the southern stilt-style architecture. Its unique construction technology is a treasure of national culture. Studying the aesthetic implication of Dong residential buildings will help people understand Dong culture more deeply. From the perspective of artistic aesthetics, this paper makes a detailed study of the dwellings of Dong people from five aspects: the environmental beauty of man-nature harmony, the beauty of building materials, the beauty of structure, the beauty of architectural skills and the beauty of culture. Hope to help readers understand the spiritual core of Dong culture, to better protect the Dong residential buildings wooden. |
submitted time 2023-01-10 Cooperative journals:《Art & Design Research》 Hits1459, Downloads176, Comment 0
From Brownfield to Green Space-Typologies, Values, a nd Perspectives
Liyang Chen; Yunmeizi Tang; Xiaoyi Liu
In the past 30 years, the development of brownland into green land has become an important way for the sustainable development and management of urban land. Fully understanding the various application scenarios and values of this approach is helpful to explore its efforts in providing ecosystem services and meet the development needs of different types of cities. This paper reviews the practice and literature of brownfield redevelopment from the perspective of landscape architecture, and obtains the process of its theoretical development and its understanding deepening. Through sorting out the relevant discipline literature, the seven main green space types and their potential broad benefits are summarized, and we realize that the brownfield itself has many values that cannot be ignored in the development process. On this basis, it proposes that there is a new cognition of the relationship between brownfield and green space. |
submitted time 2023-01-10 Cooperative journals:《Art & Design Research》 Hits847, Downloads164, Comment 0