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高校“放管服”改革政策文本量化分析

吉林省教育学院学报 2024年第4期40卷 139-143页

作者：李慧倩玉林师范学院

近年来高校“放管服”改革成效显著，但是存在着“放管服”下高校改革的政策工具结构的优化、“放管服”改革中的“政策导向”改革模式的局限性以及如何进一步提升“放管服”改革的实施效果的问题。对“放管服”的政策进行单元分析、编... 详细信息

近年来高校“放管服”改革成效显著，但是存在着“放管服”下高校改革的政策工具结构的优化、“放管服”改革中的“政策导向”改革模式的局限性以及如何进一步提升“放管服”改革的实施效果的问题。对“放管服”的政策进行单元分析、编码分类、频数统计等几个方面研究的结果显示：我国目前的政策工具结构呈现失衡状态；供给侧的政策工具过度泛滥，而需求侧的政策工具则呈现缺位状态。因此，高校可以通过对这些问题进行合理的优化，为今后的政策调整和优化提供有效的依据。

关键词： “放管服”改革政策工具高校高等教育

来源：博看期刊

Stochastic pedestrian avoidance for autonomous vehicles using hybrid reinforcement learning

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Frontiers of Information Technology & Electronic Engineering 2023年第1期24卷 131-140页

作者： huiqian li Jin HUANG Zhong CAO Diange YANG Zhihua ZHONG School of Vehicle and Mobility Tsinghua UniversityBeijing 100084China Chinese Academy of Engineering Beijing 100088China

Ensuring the safety of pedestrians is essential and challenging when autonomous vehicles are *** pedestrian avoidance strategies cannot handle uncertainty,and learning-based methods lack performance *** this paper we propose a hybrid reinforcement learning(HRL)approach for autonomous vehicles to safely interact with pedestrians behaving *** method integrates the rule-based strategy and reinforcement learning *** confidence of both strategies is evaluated using the data recorded in the training *** we design an activation function to select the final policy with higher *** this way,we can guarantee that the final policy performance is not worse than that of the rule-based *** demonstrate the effectiveness of the proposed method,we validate it in simulation using an accelerated testing technique to generate stochastic *** results indicate that it increases the success rate for pedestrian avoidance to 98.8%,compared with 94.4%of the baseline method.

关键词： Pedestrian Hybrid reinforcement learning Autonomous vehicles Decision-making

Chiral phonon activated spin Seebeck effect in chiral materials

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Science China(Physics,Mechanics & Astronomy) 2024年第3期67卷 149-155页

作者： Xiao li Jinxin Zhong Jinluo Cheng Hao Chen huiqian Wang Jun liu Dali Sun lifa Zhang Jun Zhou Phonon Engineering Research Center of Jiangsu Province Center for Quantum Transport and Thermal Energy ScienceSchool of Physics and TechnologyNanjing Normal UniversityNanjing 210023China Center for Phononics and Thermal Energy Science China-EU Joint Lab for NanophononicsSchool of Physics Science and EngineeringTongji UniversityShanghai 200092China Changchun Institute of Optics Fine Mechanics and PhysicsChinese Academy of ScienceChangchun 130033China Department of Mechanical and Aerospace Engineering North Carolina State UniversityRaleigh NC 27606USA Department of Physics North Carolina State UniversityRaleigh NC 27695USA Organic and Carbon Electronics Laboratories(ORaCEL) North Carolina State UniversityRaleigh NC 27606USA

Efficient generation of spin polarization is very important for spintronics and quantum computation. In chiral materials without magnetic order nor spin-orbit coupling, we find a new spin selectivity effect—chiral phonon activated spin Seebeck(CPASS)effect. Starting with the nonequilibrium distribution of chiral phonons under a temperature gradient, the CPASS coefficients are computed based on the Boltzmann transport theory. With both the phonon-drag and band transport contributions, the spin accumulations generated by the CPASS effect exhibit quadratic dependence on the temperature gradient. The strength of the CPASS effect and the relative magnitude of both contributions are tunable by the chemical potential modulation. The CPASS effect, which gives a promising explanation on the traditional chiral-induced spin selectivity effect, provides opportunities for the exploration of advanced spintronic devices based on chiral materials even in the absence of any magnetic order and spin-orbit coupling.

关键词： spin Seebeck effect chiral phonon phonon-drag contribution efficient spin generation

Characterization of nanometer tungsten powders

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Rare Metals 2008年第2期27卷 197-200页

作者： li huiqian liN Tao SHAO Huiping WU Chengyi GUO Zhimeng LUO Ji School of Materials Science and Engineering University of Science and Technology Beijing Beijing 100083 China

Three types of tungsten powders were prepared by hydrogen reduction of three precursor powders at low temperature, which were used as samples, and were then characterized by Brunauer-Emmer-Teller （BET） method, scanning electron microscopy （SEM）, transmission electronic microscopy （TEM）, small angle X-ray scattering （SAXS）, and field-emission scanning election microscopy （FESEM） respectively. The results showed that although BET and SEM could not characterize the particle size of nanometer powders, they were important means of assistance to exclude non-nanometer powders. TEM and FESEM could directly measure the particle size of nanometer powders, but this needs a lot of time, to count the average particle size and particle size distribution. SAXS could not describe the state of agglomeration. By the combination of FESEM and SAXS, the particle size, particle size distribution, and particle shape of nanometer powders could be precisely characterized.

关键词： nanometer tungsten powder particle size particle size distribution

制造业企业债务结构对企业创新投入的影响研究

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对外经贸 2022年第5期 84-87页

作者：李慧倩欧玲湖南人文科技学院商学院湖南娄底417000

利用2016—2020年我国制造业上市公司的数据,运用线性回归模型,实证研究了债务结构对制造业企业创新投入的影响,研究发现:制造业企业债务结构与企业创新投入成负相关。在进行了稳定性检验后,结论依然成立。根据分析结果,企业发展中应该... 详细信息

利用2016—2020年我国制造业上市公司的数据,运用线性回归模型,实证研究了债务结构对制造业企业创新投入的影响,研究发现:制造业企业债务结构与企业创新投入成负相关。在进行了稳定性检验后,结论依然成立。根据分析结果,企业发展中应该权衡债务风险与企业创新收入,以提高企业竞争力。

关键词：债务结构创新投入制造业上市公司负相关

维普期刊数据库博看期刊

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考虑驾驶权动态分配的共享转向系统鲁棒控制

汽车工程 2022年第11期44卷 1676-1688页

作者：李学鋆汪怡平苏楚奇宫新乐黄晋刘珣袁晓红李惠乾武汉理工大学现代汽车零部件技术湖北省重点实验室武汉430070 武汉理工大学汽车零部件技术湖北省协同创新中心武汉430070 清华大学车辆与运载学院北京100084

驾驶员和自动驾驶系统的驾驶权之和被固定为1时,复杂场景下可能会出现车辆转向需求与共享转向控制(shared steering control,SSC)系统输出不匹配的问题,影响车辆行驶安全。为了解决这一问题,提出了一种驾驶权动态分配方法,并针对驾驶权... 详细信息

驾驶员和自动驾驶系统的驾驶权之和被固定为1时,复杂场景下可能会出现车辆转向需求与共享转向控制(shared steering control,SSC)系统输出不匹配的问题,影响车辆行驶安全。为了解决这一问题,提出了一种驾驶权动态分配方法,并针对驾驶权分配系数和车辆参数不确定性设计了鲁棒控制器。首先,在并联式SSC系统框架的基础上,提出了包括驾驶员模型、轨迹跟踪控制器、驾驶权动态分配模型和车辆模型的SSC系统拓展框架。建立了驾驶员状态评估模型、车辆轨迹跟踪状态评估模型和驾驶权分配与决策模型;以驾驶员状态评估和车辆轨迹跟踪状态评估结果为决策依据,结合驾驶权分配模型计算结果,动态决策驾驶员与控制器的驾驶权分配系数。然后,考虑驾驶权分配系数和车辆模型参数的不确定性,设计了鲁棒反馈控制器。最后通过仿真验证了所提方法的有效性,仿真结果表明:所提SSC系统可以有效降低外部干扰和驾驶员误操作对车辆安全带来的影响,减小转向过程中驾驶员的驾驶负荷、心理负荷和控制器工作负荷。

关键词：人机共驾系统共享转向控制系统驾驶权动态分配驾驶权分配系数

基于转录组测序技术研究高原低氧对小鼠脾脏组织的影响

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中国免疫学杂志 2023年第1期39卷 11-17页

作者：李慧倩胡英许玉珍李积东郭玉静永胜(指导) 青海大学医学院西宁810016

目的:利用转录组学测序技术探究免疫系统在高原低氧胁迫适应过程中相关基因的表达及响应的分子机制。方法:本研究在高、低海拔环境分别饲养C57BL/6小鼠30 d,取脾脏组织利用RNA-Seq进行转录组测序,将得到的差异基因(DEGs)进行GO和KEGG富... 详细信息

目的:利用转录组学测序技术探究免疫系统在高原低氧胁迫适应过程中相关基因的表达及响应的分子机制。方法:本研究在高、低海拔环境分别饲养C57BL/6小鼠30 d,取脾脏组织利用RNA-Seq进行转录组测序,将得到的差异基因(DEGs)进行GO和KEGG富集分析,并通过荧光定量PCR验证测序数据的准确性。结果:与平原常氧组相比,共富集到4218个DEGs(P<0.05)。其中,ANXA1、S100A8、S100A9和HSPB1等基因显著富集;GO结果表明DEGs主要富集于B细胞激活、免疫球蛋白复合体和抗原结合分类,且JAK-STAT及NOD样受体信号通路为显著富集通路。结论:免疫系统响应高原低氧胁迫的转录调控分子可能致使机体内部免疫调节和炎症反应失衡,为相关高原病的病因学探究提供了新的理论依据。

关键词：高原低氧免疫系统脾脏转录组学测序

维普期刊数据库博看期刊

From Perception to Control:an Autonomous Driving System For a Formula Student Driverless Car

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From Perception to Control:an Autonomous Driving System For ...

Coevolution of superconductivity and Hall coefficient with anisotropic lattice shrinkage in compressed KCa_(2)Fe_(4)As_(24F_(2)

2019中国汽车工程学会年会

作者： Chen Tairan li Zirui He Yiting Xu Zewen Yan Zhe li huiqian Beijing Institute of Technology

This paper introduces the autonomous system of the "Smart Shark Ⅱ" which won the Fonnula Student Autonomous China(FSAC) Competition in *** this competition,an autonomous racecar is required to complete autonomously two laps of unknown *** this paper,the author presents the self-driving software structure of this racecar which ensure high vehicle speed and *** key components ensure a stable driving of the racecar,liDAR-based and Vision-based cone detection provide a redundant perception;the EKF-based localization offers high accuracy and high frequency state estimation;perception results are accumulated in time and space by occupancy grid *** getting the trajectory,a model predictive control algorithm is used to optimize in both longitudinal and lateral control of the ***,the performance of an experiment based on real-world data is shown.

关键词： redundant perception localization and mapping model predictive control formula student autonomous China

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Chinese Physics B 2024年第7期33卷 66-70页

作者：韩金宇洪文山蔡树赵金瑜郭静周亚洲王鹏玉曹立新罗会仟李世亮吴奇孙力玲 Beijing National Laboratory for Condensed Matter Physics Institute of PhysicsChinese Academy of SciencesBeijing 100190China Center for High Pressure Science&Technology Advanced Research Beijing 100094China University of Chinese Academy of Sciences Beijing 100190China

The stability of superconductivity in superconductors is widely recognized to be determined by various factors,including charge,spin,orbit,lattice,and other related degrees of ***,we report our findings on the pressure-induced coevolution of superconductivity and Hall coefficient in KCa_(2)Fe_(4)As_(24F_(2),an iron-based superconductor possessing a hybrid crystal structure combining KFe_(2)As_(2) and *** investigation,involving high-pressure resistance,Hall effect and x-ray diffraction(XRD) measurements,allows us to observe the connection of the superconductivity and Hall coefficient with the anisotropic lattice *** find that its ambient-pressure tetragonal(T) phase presents a collapse starting at around 18 GPa,where the sign of the Hall coefficient(R_(H)) changes from positive to *** further compression,both superconducting transition temperature(T_(c)) and R_(H) exhibit a monotonous *** around 41 GPa,the superconductivity is completely suppressed(T_(c)=0),where the parameter a begins to decline again and the Hall coefficient remains nearly *** experiment results clearly demonstrate that the pressure-induced anisotropic lattice collapse plays a crucial role in tuning the interplay among multiple degrees of freedom in the superconducting system and,correspondingly,the stability of the superconductivity.

关键词： effects of pressure pnictides and chalcogenides transport properties