Modelling of the hysteresis effect of target voltage in reactive magnetron sputtering process by using neural networks

Reactive sputtering process is very non-linear and usually exhibits hysteresis behaviour with respect to the reactive gas flow. Most of the problems encountered in the preparation of non-stoichiometric compound films by reactive sputtering are due to the hysteresis effect. Therefore, a considerable amount of effort has been devoted to find means for its elimination or ensuring a stable sputtering in the transition mode. This paper presents a new approach based on Artificial Neural Networks (ANNs) for modelling of the hysteresis effect of target voltage at different target power levels and reactive gas flow rates in reactive sputtering. Based on this model, it is possible to predict the target voltage in reactive magnetron sputtering processes, when the target power level, reactive gas flow rate and its direction are used as inputs to the artificial neural network (ANN). The proposed ANN is trained in different structures with the use of learning algorithms to obtain better performance and faster error convergence. Broyden–Fletcher–Goldfarb Shanno (BFGS) algorithm gives the best result among other learning algorithms used in the analysis. The training and test data required to develop the ANN model are obtained from the experimental studies. Both the training and the test results are in very good agreement with the experimental results obtained in this work.     

有机油气形成的影响因素——模拟实验的研究进展

地球上的油气资源主要是由地球深部的有机质热裂解形成,近年来的模拟实验对其机理获得很多认识,表明了有机质类型、温度、压力、催化作用以及水介质都对油气产物的特征存在影响。压力增加可能会阻碍或延迟有机质的热演化和裂解;水是热裂解反应的氢源和氧源;催化作用不仅可以改变产物的组成特征,而且对反应机理存在影响。动力学因素也是影响有机质裂解反应的一个很重要的方面,为不同烃源岩的判识提供了一种新思路,并建议进一步开展对更高压力下有机质的热演化机制、特征的实验模拟研究。     

A software wrapping approach based on resource access rules and behavior interception

在分析软件系统接口框架体系和软件资源访问接口特征之后,给出了一个通用资源定义模型及其描述语言和一个资源访问规则映射机制及其描述语言.在此基础之上,提出了一种面向二进制的基于资源访问抽象描述和软件行为截获的黑盒遗留软件封装方法,而且设计并实现了一个自动软件封装器原型TinyWrapper.对该方法在典型的软件重用场景中的作用进行了评估,结果表明,方法可以成功处理场景中的所有复用需求,同时验证了该方法的有效性,证明了该方法容易部署且对改造后的遗留软件产生的负载低.     

电机电流分析法在机床类设备诊断中的应用研究

机床类设备传动链复杂,结构紧凑且封闭,对传动系统状态监测一直没有有效的分析办法,即使在噪声增大等恶劣情况下,常规的振动诊断方法也难以奏效.本文尝试用电流信号分析法,简称MCSA(Motor Current Signal Analysis),对机床状态进行测试和分析.通过电机电流信号的传动链齿轮谱特征分析,对其做出了正确评估,表明定子电流能很好地反映机床传动系统部件的运行状况.同时进行了多种运行工况的测试与试验,研究结论对机床类设备的生产制造和现场运行状态的分析提供了有效依据.     

Epitaxial Growth of 1D Te/2D MoSe2 Mixed-Dimensional Heterostructures for High-Efficient Self-Powered Photodetector

Mixed-dimensional heterostructures provide additional freedom to construct diverse functional electronic and optoelectronic devices, gaining significant interest. Herein, highly-aligned pseudo-1D tellurium is epitaxially grown on 2D monolayer transition metal dichalcogenides (TMDs), including MoSe₂, MoS₂, and WS₂. A one-pot chemical vapor deposition (CVD) technique eliminates the normally required transfer steps, thereby producing mixed-dimensional heterostructures with an ultraclean interface. The controllable epitaxial growth of Te/TMD heterostructures are verified by Raman, scanning probe microscopy (SPM), and transmission electron microscopy (TEM) observation. The photoluminescence results indicate that the emission from TMDs is quenched in the heterostructure, confirming the efficient transfer of photogenerated carriers from TMDs to Te. Additionally, the mixed-dimensional p-n Te/MoSe₂ heterojunction photodetector presents self-driven behavior with high responsivity (328 mA W⁻¹), external quantum efficiency (79%), and specific detectivity (8.2 × 10⁹ Jones). The modified facile synthesis strategy and proposed growth mechanism in this study shed light on synthesizing mixed-dimensional heterojunctions. This opens avenues for fabricating functional devices with reduced sizes and high densities, further enabling miniaturization and integration opportunities.     

基于纳什均衡的需求响应多用户策略研究

随着能源互联网的出现和智能电网的发展,使得电能供给与电能需求能够更紧密的联系,也促进了电力交易市场条件下需求响应的信息化和智能化,用户根据自身情况在需求响应市场上进行出价与竞争,也更好的反映了电能的市场价值。本文结合智能电网下的需求响应市场,描述了多用户对电能竞争的一般场景与模型,从理论和算法上分析用户出价与市场调节的最优化问题,在给定的一般情况下,证明了存在一个纳什均衡,使得市场竞价能得到一个最终解的集合,实现用户竞争后的稳定解,同时给出了优化问题解的一个高效算法。     

不同煤层掘进工作面瞬变电磁法探测应用研究

煤矿井下瞬变电磁法成为煤矿井下超前探测工作的重要手段,在矿井水害预测预报上发挥着很大的作用。随着矿井上组煤层资源的逐渐枯竭,煤矿开采资源逐渐延伸向下组煤层。同一井田范围内同煤层及其顶底板的岩性特征一般相差不大,瞬变电磁法在同煤层施工过程中接收到的物理背景场较为接近;而不同煤层及其顶底板岩性特征通常会有较大的差别,瞬变电磁法在不同煤层施工过程中会接收到差别较大的物理背景场。当矿井存在多煤层开采时,通过大量数据研究瞬变电磁法在不同煤层巷道探测中的响应特征规律,分析并掌握不同煤层条件对瞬变电磁法探测结果的影响,能够提高瞬变电磁法在多煤层探测成果的准确性。     

采煤机行走部传动系统动态特性研究

采煤机行走部传动系统力学特性复杂,实际工作中由于行走故障导致采煤机停机的现象频发.为改善采煤机的行走特性,提高其行走可靠性,建立了采煤机行走部传动系统的多体动力学仿真模型,研究了传动系统动力学特性,提取了不同行走速度、不同行走负载下的齿轮啮合力和输出角速度波动曲线,分析了啮合力和输出角速度随行走速度、行走负载变化的规律...     

Zn2+掺加的包覆型Fe2O3/SiO2颜料的制备及其呈色性能

包覆型Fe2 O3/SiO2颜料由于包覆完整性并不理想,该颜料高于800℃时呈色会产生变黑、变暗的问题.采用溶胶-凝胶法制备包覆型Fe2 O3/SiO2颜料,研究催化剂浓度、反应温度、硅/铁质量比等因素对包覆型Fe2 O3/SiO2颜料呈色性能的影响.在此基础上,通过掺加Zn2+,进行了Zn2+掺加的包覆型Fe2 O3...     

Metallo-Phthalocyanines Based Photocapacitors

Silicon - The novel metallo-phthalocyanines (4–6) were obtained from the reactions of gereniol substituted phthalonitrile compound (3) with corresponding metal salts (Co (II), Cu (II) and Zn...