Gate controllable spin transistor with semiconducting tunneling barrier

In this work,we have fabricated a single layer graphene spin transistor on SiO2/Si with a semiconducting tri-layer MoS2 as the tunneling barrier between the ferromagnetic electrodes and the graphene channel.The spin transport in this parallel heterostructure were investigated in detail.The spin switch signal was controlled by tuning the conductivity of MoS2 with different gate voltages.When MoS2 was turned off under negative back gate voltage,the spin switch signal was clearly obtained,whereas it disappeared when MoS2 was conductive under positive back gate bias.This spin transistor showed on,subthreshold and off states when back gate voltage changed from negative to positive.This work exploited a new possibility of semiconducting 2D materials as the tunneling barrier of spin valves.

Research on reform schemes of control methods of inlet gate in Jiaxin Hydropower Station

The simple gate control system which is made of traditional manual or proximity switch cannot meet the requirements of connecting with the computer monitoring system of hydropower station, it must be reformed. On the basis of the integrated analysis for small hydropower station, the paper discussed the singlechip as the core to realize the methods of gate automatic control system in small hydropower station. The designs for hardware and software of gate control system were introduced. And the control system was reformed from customary manual control to computer automatic control. The simulation experiment shows that this scheme is feasible.

Quasi-two-dimensional subthreshold current model of deep submicromter SOI drive-in gate controlled hybrid transistors with lateral non-uniform doping profile

We have analyzed the operating mechanism of the novel deep submicrometer SOI drive-in gate controlled hybrid transistor (DGCHT), which can effectively alleviate the contradiction between speed enhancement and power reduction in conventional MOS devices and can improve the output resistance. On the basis of this, the subthreshold current model of DGCHTs is proposed. The model takes into account the impact of lateral non-uniform doping profile on body effect, short-channel effect and carrier mobility. Considering the mobile charge, two-dimensional Poisson equation is solved with quasi-two-dimensional analysis and parabolic approximation of surface potential. With the surface potential obtained, the subthreshold current is figured out, including both the diffusion and drift component. The calculated results are in good agreement with the MEDICI numerical simulation results, indicating the correct description of the current characteristics of SOI DGCHT by the presented model. The model can also be considered as an important reference to the current simulation of deep submicrometer MOSFET with pocket implantation.

Two-qubit and three-qubit controlled gates with cross-Kerr nonlinearity

Schemes for two-qubit and three-qubit controlled gates based on cross-Kerr nonlinearity are proposed in this paper.The probability of the success of these gates can be increased by quantum nondemolition detectors,which are used to judge which paths the signal photons pass through.These schemes are almost deterministic and require no ancilla photon.The advantages of these gates over the existing ones include less resource consumption and a higher probability of success,which make our schemes more feasible with current technology.

Estimation of enhanced low dose rate sensitivity mechanisms using temperature switching irradiation on gate-controlled lateral PNP transistor

The mechanisms occurring when the switched temperature technique is applied, as an accelerated enhanced low dose rate sensitivity （ELDRS） test technique, are investigated in terms of a specially designed gate-controlled lateral PNP transistor （GLPNP） that used to extract the interface traps （Nit） and oxide trapped charges （Not）. Electrical characteristics in GLPNP transistors induced by 60Co gamma irradiation are measured in situ as a function of total dose, showing that generation of Nit in the oxide is the primary cause of base current variations for the GLPNP. Based on the analysis of the variations of Nit and Not, with switching the temperature, the properties of accelerated protons release and suppressed protons loss play critical roles in determining the increased Nit formation leading to the base current degradation with dose accumulation. Simultaneously the hydrogen cracking mechanisms responsible for additional protons release are related to the neutralization of Not extending enhanced Nit buildup. In this study the switched temperature irradiation has been employed to conservatively estimate the ELDRS of GLPNP, which provides us with a new insight into the test technique for ELDRS.

Nonlocal multi-target controlled controlled gate using Greenberger–Horne–Zeilinger channel and qutrit catalysis

We present a scheme for implementing locally a nonlocal N-target controlled–controlled gate with unit probability of success by harnessing two（N＋1）-qubit Greenberger–Horne–Zeilinger（GHZ） states as quantum channel and N qutrits as catalyser. The quantum network that implements this nonlocal（N＋2）-body gate is built entirely of local single-body and two-body gates, and has only（3N＋2） two-body gates. This result suggests that both the computational depth of quantum network and the quantum resources required to perform this nonlocal gate might be significantly reduced. This scheme can be generalized straightforwardly to implement a nonlocal N-target and M-control qubits gate.

Selective Atom-Cavity Interaction Scheme for Quantum Controlled-NOT Gate Using Four-Level Atoms in Cavity QED System

我们为实现建议一个计划量用通过在洞量 electrodynamics 的一个选择原子洞相互作用的二个四水平的原子的控制不的门操作系统。在我们的协议，量信息在二个原子的稳定的地面状态上被编码。在在原子和单个模式的真空洞地之间的相互作用期间，当大原子洞 detuning 有效地压制原子的自发的腐烂，原子自发的排放是可以忽略的。驱散的影响和控制不的门和我们的建议的试验性的可行性也被讨论的忠实和量的相应成功概率上的相互作用时间的偏差。

One step to generate quantum controlled phase-shift gate using a trapped ion

This paper presents a very simple scheme for generating quantum controlled phase-shift gate with only one step by using the two vibrational modes of a trapped ion as the two qubits. The scheme couples two vibration degrees of freedom coupled with a suitable chosen laser excitation via the ionic states.

Direct implementation of a scalable non-local multi-qubit controlled phase gate via optical fibres and adiabatic passage

This paper presents a direct implementation scheme of the non-local multi-qubit controlled phase gate by using optical fibres and adiabatic passage. The smaller operation number for implementing the multi-qubit controlled phase gate and needlessness for addressing individually save physical resource and lower the difficulties of experiment. Mean- while, the scheme is immune from some decoherence effects such as the atomic spontaneous emission and fibre loss. In principle, it is scalable.

A Simple Scheme for Realizing a Multiqubit Controlled-Phase Gate Through a Resonant Interaction of Three-Level Atoms with a Single-Mode Cavity

一个很简单的理论计划被建议仅仅用在梯子类型之间的一个单个反响的相互作用第一实现 two-qubit 和 three-qubit 控制阶段门三水平的原子和单个模式的洞。在介绍协议，量信息在原子的稳定的地面状态上被编码(作为控制 qubits ) 并且零光子并且洞地的一个光子 Fock 状态(作为目标 qubit ) 。在原子自发的排放，洞模式的腐烂，和联合力量的偏差的影响下面， three-qubit 控制阶段门可以有一比较地高保真度。被扩大认识到 N-qubit 控制阶段门也被讨论的控制阶段门和盒子的试验性的可行性。

A novel fuzzy logic direct torque controller for a permanent magnet synchronous motor with a field programmable gate array

A high-performance digital servo system built on the platform of a field programmable gate array (FPGA),a fully digitized hardware design scheme of a direct torque control (DTC) and a low speed permanent magnet synchronous motor (PMSM) is proposed. The DTC strategy of PMSM is described with Verilog hardware description language and is employed on-chip FPGA in accordance with the electronic design automation design methodology. Due to large torque ripples in low speed PMSM,the hysteresis controller in a conventional PMSM DTC was replaced by a fuzzy controller. This FPGA scheme integrates the direct torque controller strategy,the time speed measurement algorithm,the fuzzy regulating technique and the space vector pulse width modulation principle. Experimental results indicate the fuzzy controller can provide a controllable speed at 20 r min-1 and torque at 330 N m with satisfactory dynamic and static performance. Furthermore,the results show that this new control strategy decreases the torque ripple drastically and enhances control performance.

Implementing remote controlled-NOT gates and entanglement swapping via geometric phase gates in ion-trap systems

We propose a scheme for the implementation of remote controlled-NOT gates and entanglement swapping via geometric phase gates in ion-trap systems. The proposed scheme uses the two ground states of the A-type ions as memory instead of the vibrational mode. And the system is robust against the spontaneous radiation and the dephasing.

Implementation of a Controlled-Phase Gate and Deutsch-Jozsa Algorithm with Superconducting Charge Qubits in a Cavity

基于联合到一个洞的超导的量干扰设备(枪乌) ，我们为实现一扇量控制阶段门(QPG ) 和 Deutsch-Jozsa (DJ ) 建议一个计划由一个可控制的相互作用的算法。作为量数据公共汽车在现在的计划，在费用政体的 SQUID 工作，和洞地是 ultilized，它顺序一次被联合到仅仅一 qubit。在选择 qubit 和数据公共汽车之间的相互作用例如反响、散的相互作用，能被 SQUID.Especially 转各个的门电容认识到，公共汽车没激动，因此，洞腐烂在 DJ 的实现期间被压制算法。为 QPG 操作，公共汽车的模式操作最后是未改变的，尽管它的模式确实在操作期间激动。为典型实验数据，最后，我们简单地分析建议计划的试验性的可行性。基于简单操作，我们的计划可以在这被认识到固态系统，和我们的想法可以在另外的系统被认识到。

Synthesis of Nonlinear Control of Switching Topologies of Buck-Boost Converter Using Fuzzy Logic on Field Programmable Gate Array (FPGA)

An intelligent fuzzy logic inference pipeline for the control of a dc-dc buck-boost converter was designed and built using a semi-custom VLSI chip. The fuzzy linguistics describing the switching topologies of the converter was mapped into a look-up table that was synthesized into a set of Boolean equations. A VLSI chip–a field programmable gate array (FPGA) was used to implement the Boolean equations. Features include the size of RAM chip independent of number of rules in the knowledge base, on-chip fuzzification and defuzzification, faster response with speeds over giga fuzzy logic inferences per sec (FLIPS), and an inexpensive VLSI chip. The key application areas are: 1) on-chip integrated controllers;and 2) on-chip co-integration for entire system of sensors, circuits, controllers, and detectors for building complete instrument systems.

基于注意力机制和特征融合的股票预测方法

基于人工智能在金融数据中的应用,提出了一种新的股票预测方法,称为AFG。AFG使用位置编码和时间编码获取股票数据的位置信息和时间信息,然后通过门控循环单元和多头自注意力机制对股票数据分别进行特征提取。在将两类股票特征融合之后,由全连接层导出最终的股票预测曲线。

基于模态分解及GRU-XGBoost短期电力负荷预测

精确的短期电力负荷预测能有效提高电力系统运营水平。针对电力负荷数据受多种因素影响,波动性和随机性强等问题,提出了一种基于模态分解及混合模型的负荷预测方法。首先,采用主成分分析法(principal component analysis,PCA)对负荷特征向量进行处理,去掉冗余信息,再用完全自适应噪声集合经验模态分解(complete ensemble empirical mode decomposition with adaptive noise,CEEMDAN)将历史负荷分解为简化的几个子序列;其次,选择引入样本熵(sample entropy,SE)来计算子序列熵值,将相近的子序列重构得到随机、细节、低频和趋势分量后选用不同结构门控循环单元(gate recurrent unit,GRU)对不同分量类型进行预测,再使用极致梯度提升模型(extreme gradient boosting,XGBoost)对各分量残差进行拟合,各重组序列的预测值为GRU预测值与XBGoost拟合值之和,重组各序列得到最终预测值。选取3年时电力负荷数据进行实验,结果表明,所提模型的均方根误差(root mean square error,RMSE)、平均绝对百分比误差(mean absolutepercentage error,MAPE)和平均绝对误差(mean absolute error,MAE)分别为370.676 MW、99.07%和246.89 MW,与单一模型和混合模型相比,实现了评价指标的明显减少。

Preparation of Hadamard Gate for Open Quantum Systems by the Lyapunov Control Method

In this paper, the control laws based on the Lyapunov stability theorem are designed for a two-level open quantum system to prepare the Hadamard gate, which is an important basic gate for the quantum computers. First, the density matrix interested in quantum system is transferred to vector formation.Then, in order to obtain a controller with higher accuracy and faster convergence rate, a Lyapunov function based on the matrix logarithm function is designed. After that, a procedure for the controller design is derived based on the Lyapunov stability theorem. Finally, the numerical simulation experiments for an amplitude damping Markovian open quantum system are performed to prepare the desired quantum gate. The simulation results show that the preparation of Hadamard gate based on the proposed control laws can achieve the fidelity up to 0.9985 for the different coupling strengths.

改进Transformer在产油量预测中的应用研究

产油量预测有利于制定合理的采油策略。本文提出一种包含卷积神经网络、门控循环单元和Transformer的组合模型CNN-GRU-Transformer,可用于产油量预测。该模型应用CNN提取部分深层空间特征,GRU提取产油量数据的时序特征,并根据油井数据的特点,改进了Transformer原有结构。通过改进的Transformer,将提取到的特征与预测相结合。实验的结果表明,CNN-GRU-Transformer模型在预测产油量各项指标中均为最优值,在适应产油量基本趋势方面表现最佳。

纳米材料中的界面现象

在课程教学中融入科学前沿实例不仅可以阐明所学基本原理的实际意义,还可以为基本原理的灵活应用提供范例,启发学生独立思考能力。界面化学是物理化学课程中的重要学习内容,但由于在常规尺度的多相体系中界面现象并不显著,学生对该部分知识常有忽视。近年来纳米材料已成为国内外研究的热点。纳米材料由于其高界面分子比例而表现出更为显著的界面现象。将界面化学的基本原理应用于纳米材料的研究中,已取得了一系列令人瞩目的成果。本文首先对附加压力、接触角等相关界面现象的基本原理进行梳理,然后分别介绍根据这些基本原理所发展出的分子马达、光控微流控器件、液体门控技术以及超疏水表面四项科技突破。

多波束测深声呐自主数据质量监测及门限控制

为满足水面无人艇等海洋无人平台的需求,确保多波束测深声呐系统在无人监控和参数调节下具备可靠自主工作能力,本文提出一种数据质量在线监测及门限参数控制方法。通过建立基于质量和异常因子的监测模型,结合粒子滤波技术,提高海底地形跟踪门限控制抗差性。仿真和湖上试验显示该方法能判定数据有效性、适应地形变化,并提供合理深度门限,适用于多波束测深声呐系统的在线数据质量监测和无人自主控制。