“双主体四元制一中心”技能人才培养模式的构建研究

本文以“互联网+”时代为背景,提出依托政府主导的公共实训中心,实现校企、校地联合办学,构建“双主体四元制一中心”的技能人才培养模式,加速职业教育均衡发展、中高职的有效衔接;促进科研成果的转化,企业设备、技术的升级改造;打通专本硕博直通的高技能人才培养通道,优化企业的人才结构,助力区域经济的发展,这些对于构建具有中国特色的职业教育发展模式、创新我国职业教育体系具有重要的意义。

聚醚砜制膜液的相分离2.四元体系

本文对聚醚砜（ＰＥＳ）／溶剂／丙二醇（ＰＧ）／水（Ｈ２Ｏ）四元制膜液体系的相分离进行了研究。提出了利用正四面体的某些截面表示一定组成，得出相分离曲线和相分离曲面，并能较好地描述四元体系。添加剂ＰＧ对相分离的作用相当于非溶剂作用。

德国应用型人才培养模式在中外合作办学项目中的应用

德国从上世纪五六十年代推动应用型人才培养,取得了宝贵的成功经验,值得我们在适应新常态培养满足经济社会发展需要的应用型复合型高级技术人才中吸收借鉴。中外合作办学是借鉴德国模式的理想途径,要立足本土经济社会发展实际,立足"中国制造2025"的战略需要,引进消化吸收,构建校企合作的"四元制"人才培养模式,为培养具有国际视野的高级应用型人才做出贡献。

Application of hybrid robust three-axis attitude control approach to overactuated spacecraft——A quaternion based model

A novel hybrid robust three-axis attitude control approach, namely HRTAC, is considered along with the well-known developments in the area of space systems, since there is a consensus among the related experts that the new insights may be taken into account as decision points to outperform the available materials. It is to note that the traditional control approaches may generally be upgraded, as long as a number of modifications are made with respect to state-of-the-art, in order to propose high-precision outcomes. Regarding the investigated issues, the robust sliding mode finite-time control approach is first designed to handle three-axis angular rates in the inner control loop, which consists of the pulse width pulse frequency modulations in line with the control allocation scheme and the system dynamics. The main subject to employ these modulations that is realizing in association with the control allocation scheme is to be able to handle a class of overactuated systems, in particular. The proportional derivative based linear quadratic regulator approach is then designed to handle three-axis rotational angles in the outer control loop, which consists of the system kinematics that is correspondingly concentrated to deal with the quaternion based model. The utilization of the linear and its nonlinear terms, simultaneously, are taken into real consideration as the research motivation, while the performance results are of the significance as the improved version in comparison with the recent investigated outcomes. Subsequently, there is a stability analysis to verify and guarantee the closed loop system performance in coping with the whole of nominal referenced commands. At the end, the effectiveness of the approach considered here is highlighted in line with a number of potential recent benchmarks.

An effective copy-move forgery detection algorithm using fractional quaternion Zernike moments and improved PatchMatch algorithm

An effective algorithm is proposed to detect copy-move forgery.In this algorithm,first,the PatchMatch algorithm is improved by using a reliable order-statistics-based approximate nearest neighbor search algorithm(ROSANNA)to modify the propagation process.Then,fractional quaternion Zernike moments(FrQZMs)are considered to be features extracted from color forged images.Finally,the extracted FrQZMs features are matched by the improved PatchMatch algorithm.The experimental results on two publicly available datasets(FAU and GRIP datasets)show that the proposed algorithm performs better than the state-of-the-art algorithms not only in objective criteria F-measure value but also in visual.Moreover,the proposed algorithm is robust to some attacks,such as additive white Gaussian noise,JPEG compression,rotation,and scaling.

Quaternion-based robust trajectory tracking control for uncertain quadrotors

This paper presents a robust nonlinear controller design approach for uncertain quadrotors to implement trajectory tracking missions. The quaternion representation is applied to describe the rotational dynamics in order to avoid the singularity problem existing in the Euler angle representation. A nonlinear robust controller is proposed, which consists of an attitude controller to stabilize the rotational motions and a position controller to control translational motions. The quadrotor dynamics involves uncertainties such as parameter uncertainties, nonlinearities, and external disturbances and their effects on closed-loop control system can be guaranteed to be restrained. Simulation results on the quadrotor demonstrate the effectiveness of the designed control approach.

Mechanism of Pd-catalyzed selective C–H activation of aliphatic amines via four-membered-ring cyclometallation pathway

A theoretical study is carried out on Gaunt＇s palladium-catalyzed selective C（sp3）-H activation of unprotected aliphatic amines. In this reaction, the methyl group is proposed to be activated through a four-membered cyclometallation pathway even though an ethyl group is present in the substrate. Our calculation shows that the methyl and ethyl activation processes proceed in nitrogen-atom-directed pathway rather than carbonyl-directed one. More important, methyl activation is more favorable than ethyl activation with nitrogen atom as the directing group. Further studies on the structural parameters show that the lactone structure in cyclic substrate is the origin of the selective methyl activation. When the lactone moiety is changed to ketone, ether or alkyl, the selectivity could be reversed so that the ethyl activation becomes more favorable. This result validates the pro- oosal that lactone structure is key to selective methyl activation.