A mixed-coordination electron trapping-enabled high-precision touch-sensitive screen for wearable devices

Touch-sensitive screens are crucial components of wearable devices.Materials such as reduced graphene oxide(rGO),carbon nanotubes(CNTs),and graphene offer promising solutions for flexible touch-sensitive screens.However,when stacked with flexible substrates to form multilayered capacitive touching sensors,these materials often suffer from substrate delamination in response to deformation;this is due to the materials having different Young’s modulus values.Delamination results in failure to offer accurate touch screen recognition.In this work,we demonstrate an induced charge-based mutual capacitive touching sensor capable of high-precision touch sensing.This is enabled by electron trapping and polarization effects related to mixed-coordinated bonding between copper nanoparticles and vertically grown graphene nanosheets.Here,we used an electron cyclotron resonance system to directly fabricate graphene-metal nanofilms(GMNFs)using carbon and copper,which are firmly adhered to flexible substrates.After being subjected to 3000 bending actions,we observed almost no change in touch sensitivity.The screen interaction system,which has a signal-to-noise ratio of 41.16 dB and resolution of 650 dpi,was tested using a handwritten Chinese character recognition trial and achieved an accuracy of 94.82%.Taken together,these results show the promise of touch-sensitive screens that use directly fabricated GMNFs for wearable devices.

Design of broadband achromatic metasurface device based on phase-change material Ge_(2)Sb_(2)Te_(5)

Based on the phase-change material Ge_(2)Sb_(2)Te_(5)(GST),achromatic metasurface optical device in the longer-infrared wavelength is designed.With the combination of the linear phase gradient GST nanopillar and the adjustment of the crystalline fraction m value of GST,the polarization insensitive achromic metalenses and beam deflector metasurface within the longer-infrared wavelength 9.5μm to 13μm are realized.The design results show that the achromatic metalenses can be focused on the same focal plane within the working waveband.The simulation calculation results show that the fullwidth at half-maximum(FWHM)of the focusing spot reaches the diffraction limit at each wavelength.In addition,the same method is also used to design a broadband achromatic beam deflector metasurface with the same deflection angle of 19°.The method proposed in this article not only provides new ideas for the design of achromatic metasurfaces,but also provides new possibilities for the integration of optical imaging,optical coding and other related optical systems.

Discrete element simulation of the grain mixing law in brown rice germination device

The discrete element method(DEM)was used in this study to numerically simulate the mixing process and motion law of particles in brown rice germination device.And the reliability of simulation experiments was verified through physical experiments.In the discrete element simulation experiment,there were three mixing stages in the mixing process of the particles.The particle motion conditions at different rotational speeds were rolling,cascading,cataracting and centrifuging.The lower the filling degree,the higher the particle mixing efficiency.The radial trajectory of the particles was approximated as an elliptical helix that continuously shrank towards the axis.The research results indicated that under the same speed and filling conditions,the motion of brown rice particles in both the simulated and physical test environments is rolling and the drop height is the same.

IMPLICIT-EXPLICIT MULTISTEP FINITE ELEMENT-MIXED FINITE ELEMENT METHODS FOR THE TRANSIENT BEHAVIOR OF A SEMICONDUCTOR DEVICE

The transient behavior of a semiconductor device consists of a Poisson equation for the electric potential and of two nonlinear parabolic equations for the electron density and hole density. The electric potential equation is discretized by a mixed finite element method. The electron and hole density equations are treated by implicit-explicit multistep finite element methods. The schemes are very efficient. The optimal order error estimates both in time and space are derived.

Flexible substructure online hybrid test system using conventional testing devices

This paper presents a substructure online hybrid test system that is extensible for geographically distributed tests. This system consists of a set of devices conventionally used for cyclic tests to load the tested substructures onto the target displacement or the target force. Due to their robustness and portability, individual sets of conventional loading devices can be transported and reconfigured to realize physical loading in geographically remote laboratories. Another appealing feature is the flexible displacement-force mixed control that is particularly suitable for specimens having large disparities in stiffness during various performance stages. To conduct a substructure online hybrid test, an extensible framework is developed, which is equipped with a generalized interface to encapsulate each substructure. Multiple tested substructures and analyzed substructures using various structural program codes can be accommodated within the single framework, simply interfaced with the boundary displacements and forces. A coordinator program is developed to keep the boundaries among all substructures compatible and equilibrated. An Interuet-based data exchange scheme is also devised to transfer data among computers equipped with different software environments. A series of online hybrid tests are introduced, and the portability, flexibility, and extensibility of the online hybrid test system are demonstrated.

Analysis of a two-grid method for semiconductor device problem

The mathematical model of a semiconductor device is governed by a system of quasi-linear partial differential equations.The electric potential equation is approximated by a mixed finite element method,and the concentration equations are approximated by a standard Galerkin method.We estimate the error of the numerical solutions in the sense of the Lqnorm.To linearize the full discrete scheme of the problem,we present an efficient two-grid method based on the idea of Newton iteration.The main procedures are to solve the small scaled nonlinear equations on the coarse grid and then deal with the linear equations on the fine grid.Error estimation for the two-grid solutions is analyzed in detail.It is shown that this method still achieves asymptotically optimal approximations as long as a mesh size satisfies H=O(h^1/2).Numerical experiments are given to illustrate the efficiency of the two-grid method.

On a Parasitic Bipolar Transistor Action in a Diode ESD Protection Device

In this work, we show that an excessive lattice heating problem can occur in the diode electrostatic discharge (ESD) protection device connected to a VDD bus in the popular diode input protection scheme, which is favorably used in CMOS RF ICs. To figure out the reason for the excessive lattice heating, we construct an equivalent circuit for input human-body model (HBM) test environment of a CMOS chip equipped with the diode protection circuit, and execute mixed-mode transient simulations utilizing a 2-D device simulator. We analyze the simulation results in detail to show out that a parasitic pnp bipolar transistor action relating nearby p+-substrate contacts is responsible for the excessive lattice heating in the diode protection device, which has never been focused before anywhere.

小型高效气动立式预混装置异形桨叶工作特性研究

为解决某交联剂在预混时溶解慢、易挥发、对操作人员危害大等问题,开发了一套采用单轴异形桨叶的可远程控制的小型高效立式气动预混装置。通过有限元方法计算了四种搅拌叶片的流场特性,分析了异形桨叶和其他三种常用桨叶的总体流型、速度流线分布。结果表明,在预混转速为45 rpm时,异形叶片可实现交联剂径向流动,使旋转中心的交联剂充分混合,有效防止中心死区的出现,展现出良好的预混性能,预混时间由人工预混的6 h缩短为2 h,乙腈溶液挥发量减少了60.8%,有效解决了交联剂挥发和挂壁析出问题,提高了交联剂的预混效率。

新型真空耙式干燥机优化设计与蒸发性能研究

针对现有耙式干燥机运行中存在的蒸汽消耗大、干燥效率不高、传热不均匀等技术难题,以及筒内残余滤渣层造成较大的物料损失,难以满足安全、环保和GMP(良好生产规范)要求等技术难点,通过查阅文献并进行大量的实验研究,设计了一种高效、节能耙式干燥机,自主提出一种轻量化的内、外筒与浆叶复合加热搅拌轴结构。该结构中心转轴、连接轴和搅拌桨叶均为空心设计,桨叶刮擦部距离筒壁间隙3~5 mm,达到了所需搅拌动力显著降低、换热面积大、传热效率高的效果,实现了不留残余物料、降低生产成本、保证人和物料的完全隔离的目的,可满足制药行业的GMP要求。实际试验研究结果表明,干化减量比例达19.9%,蒸汽单耗32.8%,能耗明显减少,说明该方法与设备具有较高的推广应用价值。

电网二三维融合画面的多终端展示研究

随着各种新型输变电设备特别是直流输电设备发展,设备种类越来越多,复杂度越来越高,传统二维画面难以满足电网设备监控的要求,二三维融合的监视方式在设备全面监视方面得到越来越多的应用。然而,限于二维和三维的技术差异以及传统开发技术路线转型难度大,此类融合监视画面存在Web发布难的问题,难以做到“一端维护、多端展示”的目标,给工程实施带来较大难度。针对这个难点,研究一套电网二三维融合画面的多终端展示框架,以HTML5页面为三维模型渲染载体,消除不同终端三维渲染方式的差异,实现二三维融合画面“一端维护、多端展示”的目标,保证了多终端画面内容的一致性,有利于融合画面的推广应用。

基于混合现实技术的船舶机舱集中操控试验装置设计与实现

文章提出一种基于混合现实(MR)的船舶机舱设备集中操控试验装置和管控方法,即时收集船舶机舱内数据,针对收集的数据建立数学模型,模拟舱内三维场景,从而对舱内设备实施控制。研究了基于MR的船舶机舱设备集中操控系统设计方案和方法,应用Faster R-CNN目标检测网络深度学习的船舶机舱设备状态指示识别框架与算法。从MR机舱设备集中操控流程、构建机舱三维模型及其优化、集中操控方法及其实操训练等环节的迭代研发,完成了MR机舱设备集中操控功能的测试验证。将混合现实技术应用于轮机设备操作、机舱资源管理等实践实训教学中,增强了船舱空间分析和可视化的交互效果。

植保无人机精准喷施方法研究综述

作为一种新兴农业技术,植保无人机以其高效、精准、灵活等特点在农作物疾病和虫害防治中具有重要意义。综述了植保无人机精准喷施方法的关键技术,包括植保无人机发展现状、路径规划算法、喷施器研究和漂移控制。通过对相关文献的分析和整理,总结了植保无人机路径规划算法的特点和应用情况,重点介绍了经典路归算法、遗传算法以及蚁群优化等元启发算法的优点和不足,以及喷施器研究和漂移控制研究的进展和挑战。最后,提出了未来研究的方向和建议,包括改进算法性能、优化路径规划策略、提高喷施器的精度和稳定性、优化漂移控制算法等。旨在为相关研究者提供全面的研究概览,推动植保无人机精准喷施技术的进一步发展和应用。

油气萃取计量增压混输装置在长庆油田页岩油开发中的应用

针对长庆油田页岩油开发过程中油井平台集输工艺面临的计量难题及井组集输问题,开发应用了油气萃取计量增压混输装置,并分析其结构组成、工艺流程及技术创新特点。通过该装置的实际应用,成功实现了降低井口回压、提升油井产量、减少计量误差、增强原油外输压力、回收利用油井伴生气等多重目标;不仅优化了井站集输工艺流程,还简化了地面设施布局,有效地控制了投资成本及运行费用,为油田开发领域提供了新的高效的解决方案。该装置的应用具有显著的理论指导意义和实践应用价值。

油气萃取计量增压混输工艺在页岩油田的应用与效果分析

针对长庆油田页岩油田开发油井主要采用开放式和高回压密闭两种集输模式存在的各种问题分析,阐述了油气萃取计量增压混输工艺技术在长庆油田页岩油田开发井组平台的应用必要性,介绍了油气萃取计量增压混输装置的结构及技术特点,通过对该工艺在页岩油田现场应用生产情况跟踪统计,分析证明该工艺能够有效地解决页岩油田油井集输过程中存在的高气油比、高回压、伴生气回收难以及开式输油点密闭集输等问题;该工艺还能优化井站集输工艺流程,提高集输效率,降低地面投资。

压裂液连续混配装置混合罐设计研究

石油天然气压裂用连续混配装置的核心技术是配液,与配液相关的设备主要是混合罐,混合罐设计中主要考虑基液特性、罐体设计和搅拌器设计。基液特性主要考虑流量、黏度、添加剂、成本等;罐体主要考虑材料、形状、挡板位置、舱室容积、基液流向,罐体为延长基液流经时间采用迷宫式设计;搅拌器主要考虑转速、功率、直径、段数、叶片形状等,为达到良好搅拌效果搅拌器采用两段式设计。该设计研究可应用于同类产品设计与计算,是压裂液连续混配装置混合罐的核心技术和重要设计依据。

多生产线沥青混凝土拌合站布置空间规划研究

该文结合四川南充一典型商品沥青混合料拌合站规划建设实例,在有限的场站空间中充分利用地形及架空、地下式输送装置,布置包括旧沥青砼破碎、废建材修型、水泥稳定混合料生产、乳化沥青生产和沥青混合料生产等多条生产线,通过合理规划各功能分区,场区运输线路实现多生产线同步运行、高效生产的目标,为同类拌合站、破碎场规划建设提供借鉴。

色谱试验标准混合气体摇匀装置的研制与应用

针对目前广泛使用的手动摇匀标准混合气体的方式存在作业效率低、标定试验结果不易达到重复性要求、试验精度低、安全风险高以及不符合人机功效等问题,首先设计了可控式活塞摇匀器,代替手动摇匀功能,以提高工作效率和提高试验精度;再设计了剪叉式升降结构平台及标定气瓶导向车,提高人机功效;从运行稳定、控制精准及操作简便三方面选择制造材料和控制系统,最终研制了一套色谱试验标准混合气体摇匀装置,可实现自动摇匀钢瓶内的标准混合气体,并在试验室检验其应用效果。应用结果表明,色谱试验标准混合气体摇匀装置可快速、省力、安全地使钢瓶中的标准混合气体混合均匀,提高标定试验的成功率及标定试验精度,保证色谱试验结果的准确性。尤其对于缺陷跟踪充油式电气设备,可以更好地掌握其运行状态。

加压装置在晶圆键合系统中的应用

加压系统作为高精度晶圆键合设备的核心组件,其性能和稳定性直接影响晶圆键合质量和成品率。探讨了加压系统对晶圆键合工艺的影响,对比分析了气缸、液压缸、电缸和气液混合缸等加压装置在晶圆键合工艺中的优缺点。认为最适合高精度晶圆键合设备的加压方案为利用气液混合缸的方式。进一步分析了气液混合缸在晶圆键合设备中的应用原理,并通过实际验证效果对其性能进行了评价。展望了气液混合缸在高精度晶圆键合设备中的应用前景,并探讨了其在未来市场的发展潜力。

Design and test of a multi-edge toothed cutting device for membraneimpurity mixed material

As the existing residual film crushing device in Xinjiang cannot directly crush membrane-impurity mixed material,by analyzing the compressive and cutting force characteristics of residual film material layer and cotton stalk,the cutting conditions of mixed materials were obtained,and the method of cutting was determined.A multi-edge toothed cutters was created,and a cutting device was built.It was preliminarily determined that the number of teeth in the cutters was 8,the clearance between the teeth and between the tooth and fixed blade was 3 mm,the speed of the high-speed cutter was 800 r/min,and the speed difference between the high-and low-speed cutters was-300 r/min.Test results show that the ratio of residual film to total residual film sampling mass was(2.22±0.30)%,(19.19±2.02)%,(58.94±3.19)% and(20.65±2.05)%,respectively,when the maximum outer profile size in the range of[0,20)mm,[20,100)mm,[100,500)mm and[500,~)mm.The mass of cotton stalks with lengths of[0,50)mm,[50,100)mm and[100,~)mm accounted for(32.57±1.5)%,(27.77±1.3)%and(39.66±1.75)%,respectively,and the cutting power consumption was(85.41±15.63)kJ.The test results can provide a basis for the subsequent membrane-impurity mixed material cutting technology,as well as some guidance for the separation of it.

泡沫比例混合装置的对比与选型

固定式泡沫灭火系统是石化企业常用的灭火系统之一,泡沫比例混合装置是本系统中最关键的组成部分,本文主要针对几种常见泡沫比例混合装置,简要介绍了各个装置的工作原理及流程,从造价、结构、施工及维护等方面,对不同泡沫比例混合装置的产品特点进行了对比,为日后泡沫装置的选型提供理论依据。