基于Smart 3D软件的船舶二维与三维集成设计变更

船舶二维与三维集成设计流程复杂、变更需求大。梳理船舶设计变更研究现状。基于Smart 3D软件,从数据处理、二维与三维映射转换和设计变更管理等方面进行船舶二维与三维集成设计变更关键技术分析,并对船舶二维与三维集成设计变更的可行性进行实例验证。结果表明,基于Smart 3D软件进行船舶二维与三维集成设计变更可有效提升集成设计变更的精度与管理效率。

二维bagging集成支持向量机进行网络故障诊断

由于网络故障信息通常表现出不确定、复杂的特点并且对故障特征的描述也多是非完备的,运用支持向量机进行故障诊断经常不能达到其最优性能。本文提出一种新颖的二维bagging集成支持向量机,显著提高了传统支持向量机进行网络故障诊断的精度。实验结果验证了该方法的准确性和有效性。

不同辐射建模下球腔的整体数值模拟

不同辐射建模对于腔内辐射场描述的精确程度不同,需要分析不同建模对腔内辐射温度的影响。开展了三温建模与辐射多群输运建模下LARED集成程序数值模拟两孔球型黑腔模型,实现了球腔的完整数值模拟。数值模拟结果表明,三温与辐射多群输运模拟的等离子体状态接近,辐射温度存在差异。物理分析显示辐射温度差异的主要原因是使用的辐射不透明度,修改辐射不透明度参数后的三温计算结果与输运计算符合更好,从而可以用三温建模更快更准确地估计出所需的激光能量和功率。

2×4正方形微腔激光器阵列的激射特性

制备了以四端口直连波导正方形微腔为基本单元的2×4半导体微腔激光器阵列。上下两排正方形微腔均设计为整体电极以简化实验操作。通过测量不同端口处的输出光谱,每个正方形微腔单元的模式得以识别。进一步地,通过调节注入电流,可以实现模式位置和数量的有效调控。该激光器阵列实现了多路光源的面内集成,为片上大面积集成的微腔激光器提供了可能,并为多端口光源以及全光计算等应用提供了参考。

An artificial neural network chip based on two-dimensional semiconductor

Recently,research on two-dimensional(2D)semiconductors has begun to translate from the fundamen-tal investigation into rudimentary functional circuits.In this work,we unveil the first functional MoS2 artificial neural network(ANN)chip,including multiply-and-accumulate(MAC),memory and activation function circuits.Such MoS2 ANN chip is realized through fabricating 818 field-effect transistors(FETs)on a wafer-scale and high-homogeneity MoS2 film,with a gate-last process to realize top gate structured FETs.A 62-level simulation program with integrated circuit emphasis(SPICE)model is utilized to design and optimize our analog ANN circuits.To demonstrate a practical application,a tactile digit sensing recognition was demonstrated based on our ANN circuits.After training,the digit recognition rate exceeds 97%.Our work not only demonstrates the protentional of 2D semiconductors in wafer-scale inte-grated circuits,but also paves the way for its future application in AI computation.

Third-Order Optical Nonlinearity in Two-Dimensional Transition Metal Dichalcogenides

We present a detailed calculation of the linear and nonlinear optical response of four types of monolayer twodimensional (2D) transition-metal dichalcogenides (TMDCs), having the formula MX2 with M=Mo, W and X=S, Se.The calculations are based on 6-band tight-binding model of TMDCs, and then performing a semi-classical perturbation analysis of response functions. We numerically calculate the linearχ(1)μν(-ω;ω) and nonlinear surface susceptibility tensorsχ(3)μνζη(-ωΣ;ωr,ωs,ωt) withωΣ=ωr+ωs+ωt. Both non-degenerate and degenerate cases are studied for thirdharmonic generation and nonlinear refractive index, respectively. Computational results obtained with no external fitting parameters are discussed regarding two recent reported experiments on Mo S2, and thus we can confirm the extraordinarily strong optical nonlinearity of TMDCs. As a possible application, we demonstrate generation of aπ/4-rotated squeezed state by means of nonlinear response of TMDCs, in a silica micro-disk resonator covered with the 2D material. Our proposed method will enable accurate calculations of nonlinear optical response, such as four-wave mixing and highharmonic generation in 2D materials and their heterostructures, thus enabling study of novel functionalities of 2D photonic integrated circuits.

基于“互联网+”《工程化学》新数字化教材的探索与建设

新数字化教材是纸质教材与电子教材的有机结合,既具有纸质教材的真实感强、书写方便等特点,又具有电子教材的信息量大、有声有色等优点。以《工程化学》第二版为例,由于课程的容量大、学时少,在教学中会使学生感到课程枯燥、抽象,利用教材、电脑、手机打造互动性和操作性强的新数字媒体形式,引进二维码集成平台,整合多方面的化学资源,实现三维呈现、动画演示和实时交互等功能,供学生实时体验,提高学生学习的积极性和主动性。