非齐次等式约束线性回归模型回归系数的广义条件岭估计

时非齐次等式约束线性回归模型回归系数提出广义条件岭估计.证明了在一定的条件下,在均方误差矩阵、均方误差及广义均方误差意义下,广义条件岭估计都优于约束最小二乘估计和狭义条件岭估计.     

RRM1 gene expression in peripheral blood is predictive of shorter survival in Chinese patients with advanced non-small-cell lung cancer treated by gemcitabine and platinum

Objective  

To evaluate the predictive values of gene expressions of ribonucleotide reductase M1 (RRM1) and breast cancer susceptibility gene 1 (BRCA1) in peripheral blood from Chinese patients with non-small-cell lung cancer (NSCLC) treated with gemcitabine plus platinum.     

TOE框架下的省级政务大数据发展水平影响因素与发展路径——基于fsQCA实证研究

[研究目的]大数据赋能政府数字化转型已经成为国家治理体系和治理能力现代化的重要抓手。然而,严重的“数字鸿沟”问题依旧是制约我国政务大数据整体发展水平提升重要瓶颈。如何因地制宜发展政务大数据,破解“数字鸿沟”难题亟待学界探究。[研究方法]将TOE框架与中国具体的治理情境相结合,运用模糊集定性比较分析法(fsQCA)对全国31个省(自治区、直辖市)政务大数据发展水平的影响因素与发展路径进行了研究。[研究结论]研究结果表明,省级政务大数据发展水平受到技术、组织和环境三个层面因素的综合影响;其次,共有7种实现省级政务大数据高水平发展的路径;根据主导因素的差异,7种发展路径可归纳为:黄牛型(组织驱动型)、脱兔型(技术驱动型)和雄狮型(技术-组织驱动型)三大发展模式。黄牛型和脱兔型应尽可能向雄狮型的发展模式转变。     

我国化学学科发展均衡协调

"化学学科均衡、协调发展"有狭义和广义两种理解:前者仅仅指"化学各学科、各专业"内部之间的均衡布局与协调发展;后者是指以学科均衡布局为核心,在人才队伍、地域分布、国家战略需求、社会影响等各方面的综合均衡。现阶段我国化学学科现状表现出学科总体均衡、协调,交叉性突出的特点。     

《文选》中潘岳赋六首释证

《文选》中录入了8首潘岳赋.其中《藉田赋》和《射雉赋》分别反映了潘岳青年时期扬才露己及无忧无虑的思想;《秋兴赋》反映了其处于官场斗争中的归隐思想;《怀旧赋》中有一些疑点值得重新阐释;《寡妇赋》是模仿前人的同题之作;《笙赋》则是《文选》音乐赋中的推陈出新之作.     

高校学生党课教学方法新论

党课是大学生学习党的基本理论,加深对党的了解,端正入党动机的重要载体,但大学生对党课的兴趣不浓,评价不高。文章认为需要从党课教育的系统性、情感手段的运用、网络多媒体技术、知行合一等四个方面增强党课教学的实效性。     

独立学院学生英语学习动机的培养研究

动机在大学英语学习的过程及学习效果方面起着重要的作用。为了提高语言学习的效率,帮助学生树立语言学习目标,激发其积极的学习信心和学习动机,独立学院英语教师应该了解学生不同的学习特点和影响学生学习动机的因素,并加强培养学生的学习动机。     

Corresponding drivability control and energy control strategy in uninterrupted multi-speed mining trucks

An hybrid uninterrupted multi-speed transmission (HUMST), based on the integration of a planetary gear set and a 3-speed automatic manual transmission (3-AMT), is developed to satisfy the specific performance indexes of mining trucks. The power-split device can alleviate and eliminate the inherent torque interruption of the 3-AMT during gear shift by implementing the designed cooperative shift control strategy which is optimized by quadratic performance index. In order to achieve fast torque coordination while guaranteeing the driving comfort performance, the torque profiles of the power split device and the traction motor are optimized by Linear-quadratic regulator (LQR) algorithm. Dynamic programming (DP) is implemented as a benchmark to demonstrate the maximum fuel efficiency of the proposed HUMST. Because of the high computational cost of optimal control strategies such as DP, an improved real-time control strategy (IRTCS) using modified Gaussian distribution function is proposed to significantly reduce the computing load. As efficiency-oriented energy control strategy would result in frequent gear shifts, to achieve a desirable tradeoff between the overall efficiency and the shift stability, multi-objective genetic algorithm (MGA) is integrated to optimize the overall performance. The detail mathematical and dynamic model shows that the proposed shifting strategy with LQR can effectively suppress shift jerk, and the proposed IRTCS with MGA can reduce shift frequency by 70.78% to improve the drivability, only sacrificing 4.86% of overall efficiency compared to that of DP.