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The unitary subgroups of group algebras for a class of finite 2-groups with the derived subgroup of order 2

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Science China Mathematics 2024年

作者： yulei wang Heguo Liu Department of Mathematics Henan University of Technology Department of Mathematics Hainan University

Let p be a prime and F be a finite field of characteristic *** that FG is the group algebra of the finite p-group G over the field *** V(FG) denote the group of normalized units in FG and let V_*(FG)denote the unitary subgroup of V(FG).If p is odd,then the order of V_*(FG) is|F|~((|G|-1)/2).However,the case p=2 still is *** this paper,the order of V_*(FG) is computed when G is a nonabelian 2-group given by a central extension of the form1→Z2n×Z2m→G→Z2×…×Z2→1and G’≌Z2,n,m≥***,a conjecture is confirmed,i.e.,the order of V_*(FG) can be divisible by|F|~(1/2(|G|+|Ω1(G)|)-1),whereΩ1(G)={g∈G|g2=1}.

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Evolutionary Decision-Making and Planning for Autonomous Driving Based on Safe and Rational Exploration and Exploitation

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Engineering 2024年第2期33卷 108-120页

作者： Kang Yuan Yanjun Huang Shuo Yang Zewei Zhou yulei wang Dongpu Cao Hong Chen College of Electronic and Information Engineering Tongji UniversityShanghai 201804China Shanghai Institute of Intelligent Science and Technology Tongji UniversityShanghai 201210China School of Automotive Studies Tongji UniversityShanghai 201804China School of Vehicle and Mobility Tsinghua UniversityBeijing 100084China

Decision-making and motion planning are extremely important in autonomous driving to ensure safe driving in a real-world *** study proposes an online evolutionary decision-making and motion planning framework for autonomous driving based on a hybrid data-and model-driven ***,a data-driven decision-making module based on deep reinforcement learning(DRL)is developed to pursue a rational driving performance as much as ***,model predictive control(MPC)is employed to execute both longitudinal and lateral motion planning *** constraints are defined according to the vehicle’s physical limit to meet the driving task ***,two principles of safety and rationality for the self-evolution of autonomous driving are proposed.A motion envelope is established and embedded into a rational exploration and exploitation scheme,which filters out unreasonable experiences by masking unsafe actions so as to collect high-quality training data for the DRL *** with a high-fidelity vehicle model and MATLAB/Simulink co-simulation environment are conducted,and the results show that the proposed online-evolution framework is able to generate safer,more rational,and more efficient driving action in a real-world environment.

关键词： Autonomous driving Decision-making Motion planning Deep reinforcement learning Model predictive control

Characteristics and suppression of beam distortion in a high repetition rate nanosecond stimulated Brillouin scattering phase conjugation mirror

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High Power Laser Science and Engineering 2024年第2期12卷 69-78页

作者： Yifu Chen Bowen Tan Duo Jin Bin Chen Zhenxu Bai Kun wang yulei wang Zhiwei Lü School of Astronautics Harbin Institute of TechnologyHarbinChina Center for Advanced Laser Technology Hebei University of TechnologyTianjinChina Hebei Key Laboratory of Advanced Laser Technology and Equipment TianjinChina School of Energy and Environmental Engineering Hebei University of TechnologyTianjinChina

The stimulated Brillouin scattering phase conjugation mirror (SBS-PCM) based on liquid media is widely used in high-power laser systems due to its robust thermal load capacity, high energy conversion efficiency and improved beam quality. Nevertheless, with an increase in the pump repetition rate, thermally-induced blooming and optical breakdown can emerge, leading to distortions in the Stokes beam. In this study, we delved into the thermal effects in liquid SBS-PCMs employing hydrodynamic analysis, establishing a relationship between beam profile distortion and the thermal convection field. We calculated the temperature and convection velocity distribution based on the pump light parameters and recorded the corresponding beam profiles. The intensities of the beam profiles were modulated in alignment with the convection directions, reaching a velocity peak of 2.85 mm/s at a pump pulse repetition rate of 250 Hz. The residual sum of squares (RSS) was employed to quantify the extent of beam profile distortion relative to a Gaussian distribution. The RSS escalated to 7.8, in contrast to 0.7 of the pump light at a pump pulse repetition rate of 500 Hz. By suppressing thermal convection using a high-viscosity medium, we effectively mitigated beam distortion. The RSS was reduced to 0.7 at a pump pulse repetition rate of 500 Hz, coinciding with a twentyfold increase in viscosity, thereby enhancing the beam quality. By integrating hydrodynamic analysis, we elucidated and mitigated distortion with targeted solutions. Our research offers an interdisciplinary perspective on studying thermal effects and contributes to the application of SBS-PCMs in high-repetition-rate laser systems by unveiling the mechanism of photothermal effects.

关键词： beam profile high power high repetition rate stimulated Brillouin scattering phase conjugation mirror thermal convection

Outage Probability Analysis for D2D-Enabled Heterogeneous Cellular Networks with Exclusion Zone:A Stochastic Geometry Approach

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工程与科学中的计算机建模(英文) 2024年第1期138卷 639-661页

作者： yulei wang Li Feng Shumin Yao Hong Liang Haoxu Shi Yuqiang Chen School of Computer Science and Engineering Macao University of Science and TechnologyTaipaMacaoChina Department of Broadband Communication Peng Cheng LaboratoryShenzhenChina School of Artificial Intelligence Dongguan PolytechnicDongguanChina

Interference management is one of the most important issues in the device-to-device(D2D)-enabled heterogeneous cellular networks(HetCNets)due to the coexistence of massive cellular and D2D devices in which D2D devices reuse the cellular *** alleviate the interference,an efficient interference management way is to set exclusion zones around the cellular *** this paper,we adopt a stochastic geometry approach to analyze the outage probabilities of cellular and D2D users in the D2D-enabled *** main difficulties contain three aspects:1)how to model the location randomness of base stations,cellular and D2D users in practical networks;2)how to capture the randomness and interrelation of cellular and D2D transmissions due to the existence of random exclusion zones;3)how to characterize the different types of interference and their impacts on the outage probabilities of cellular and D2D *** then run extensive Monte-Carlo simulations which manifest that our theoretical model is very accurate.

关键词： Device-to-device(D2D)-enabled heterogeneous cellular networks(HetCNets) exclusion zone stochastic geometry(SG) Matérn hard-core process(MHCP)

Reinforced concrete-like Na_(3.5)V_(1.5)Mn_(0.5)(PO_(4))_(3)@graphene hybrids with hierarchical porosity as durable and high-rate sodium-ion battery cathode

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Chinese Chemical Letters 2024年第4期35卷 214-219页

作者： Tao Long Peng Chen Bin Feng Caili Yang Kairong wang yulei wang Can Chen Yaping wang Ruotong Li Meng Wu Minhuan Lan Wei Kong Pang Jian-Fang Wu Yuan-Li Ding College of Materials Science and Engineering Hunan UniversityChangsha 410082China Department of Physics Xiamen UniversityXiamen 361005China College of Chemistry and Chemical Engineering Central South UniversityChangsha 410083China Institute for Superconducting&Electronic Materials Faculty of EngineeringUniversity of WollongongWollongongNSW 2522Australia

Realizing high-rate capability and high-efficiency utilization of polyanionic cathode materials is of great importance for practical sodium-ion batteries(SIBs) since they usually suffer from extremely low electronic conductivity and limited ionic diffusion kinetics. Herein, taking Na_(3.5)V_(1.5)Mn_(0.5)(PO_(4))_(3)(NVMP) as an example, a reinforced concrete-like hierarchical and porous hybrid(NVMP@C@3DPG) built from 3D graphene(“rebar”) frameworks and in situ generated carbon coated NVMP(“concrete”) has been developed by a facile polymer assisted self-assembly and subsequent solid-state method. Such hybrids deliver superior rate capability(73.9 m Ah/g up to 20 C) and excellent cycling stability in a wide temperature range with a high specific capacity of 88.4 m Ah/g after 5000 cycles at 15 C at room temperature, and a high capacity retention of 97.1% after 500 cycles at 1 C(-20 ℃), and maintaining a high reversible capacity of 110.3 m Ah/g in full cell. This work offers a facile and efficient strategy to develop advanced polyanionic cathodes with high-efficiency utilization and 3D electron/ion transport systems.

关键词： Sodium-ion battery Polyanionic cathode Hybrid structure Interconnected structure Energy storage

Risk of interstitial lung disease with the use of programmed cell death 1 (PD-1) inhibitor compared with programmed cell death ligand 1 (PD-L1) inhibitor in patients with breast cancer: A systematic review and meta-analysis

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Cancer Pathogenesis and Therapy 2024年第2期2卷 91-102页

作者： Lijuan Guo Xiaoyi Lin Xin Lin yulei wang Jiali Lin Yi Zhang Xiangqing Chen Miao Chen Guochun Zhang Yifang Zhang Department of Breast Surgery Guangdong Provincial People's Hospital(Guangdong Academy of Medical Sciences)Southern Medical UniversityGuangzhouGuangdong 510000China Schol of Medicine South China University of TechnologyGuangzhouGuangdong 510000China Medical College Shantou UniversityShantouGuangdong 515000China The Second School of Clinical Medicine Southerm Medical UniversityGuangzhouGuangdong 510000China Department of Breast Cancer Guangdong Provincial People's Hospital's Nanhai HospitalFoshanGuangdong 528000China Department of Emergency Medicine Guangdong Provincial People's Hospitals Nanhai HospitalFoshanGuangdong 528000China

Background:Programmed cell death 1(PD-1)and programmed cell death ligand 1(PD-L1)inhibitors have become integral elements within the current landscape of breast cancer treatment modalities;however,they are associ-ated with interstitial lung disease(ILD),which is rare but potentially ***,only a few studies have compared the difference in ILD incidence between PD-1 and PD-L1 ***,this study aimed to assess the discrepancies regarding ILD risk between the two immune checkpoint *** also reported three cases of ILD after PD-1 inhibitor ***:We comprehensively searched PubMed,EMBASE,and the Cochrane Library to identify clinical trials that investigated PD-1/PD-L1 inhibitor treatment for patients with breast *** overall estimates of incidence and risk ratio(RR)were calculated with a 95%confidence interval(CI),and a mirror group analysis was per-formed using eligible ***:This meta-analysis included 29 studies with 4639 patients who received PD-1/PD-L1 inhibitor treatment.A higher ILD incidence was observed among 2508 patients treated with PD-1 inhibitors than among 2131 patients treated with PD-L1 inhibitors(0.05 vs.0.02).The mirror group analysis further revealed a higher ILD event risk in patients treated with PD-1 inhibitors than in those treated with PD-L1 inhibitors(RR=2.34,95%CI,1.13-4.82,P=0.02).Conclusion:Our findings suggest a greater risk of ILD with PD-1 inhibitors than with PD-L1 *** findings are instrumental for clinicians in treatment deliberations,and the adoption of more structured diagnostic approaches and management protocols is necessary to mitigate the risk of ILD.

关键词： Programmed cell death 1 inhibitor Programmed cell death ligand 1 inhibitor Interstitial lung disease Breast cancer Immune-related adverse events

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基于梯度掺杂晶体的激光器模式匹配研究

中国激光 2024年第5期51卷 1-11页

作者：满朝阳崔璨王雨雷刘福寒李银栋白振旭吕志伟河北工业大学先进激光技术研究中心天津300401 河北省先进激光技术与装备重点实验室天津300401

针对梯度掺杂晶体和均匀掺杂晶体,采用数值模拟的方式分析了泵浦光束腰半径、光束质量因子(M^(2))与束腰位置对模式匹配效率的影响,并通过实验验证了不同束腰位置对激光器输出功率的影响。由计算结果得到,在不同的泵浦光参数下,与均匀... 详细信息

针对梯度掺杂晶体和均匀掺杂晶体,采用数值模拟的方式分析了泵浦光束腰半径、光束质量因子(M^(2))与束腰位置对模式匹配效率的影响,并通过实验验证了不同束腰位置对激光器输出功率的影响。由计算结果得到,在不同的泵浦光参数下,与均匀掺杂晶体相比,梯度掺杂晶体均具有更稳定的模式匹配;当泵浦光M^(2)为10和50,束腰半径为0.5 mm时,对于任意位置的束腰,梯度掺杂晶体的模式匹配效率都高于均匀掺杂晶体。在实验上对比分析了泵浦光不同束腰位置的输出功率,结果表明,梯度掺杂晶体的模式匹配效率受泵浦光束腰位置的影响较小。当晶体位于谐振腔中心时,在高于70 W的泵浦条件下,梯度掺杂晶体的输出功率高于均匀掺杂晶体,最高输出功率为44.8 W,与均匀掺杂晶体相比,提高了4.67%;当晶体紧贴输入镜时,梯度掺杂晶体的最高输出功率为34.0 W,与均匀掺杂晶体相比,提高了11.84%。因此,梯度掺杂晶体更适用于高功率泵浦。

关键词：激光器梯度掺杂晶体模式匹配激光器理论端面泵浦高功率激光

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机车车体重量测量及调平系统

机车车辆工艺 2024年第2期60卷 49-53页

作者：王玉磊王辉李显峰中车大同电力机车有限责任公司山西大同037038

电力机车车体重量大、尺寸长,为了解决车体称重难题,文章设计了一种基于坐标系变换方法机车车体重量分布测量系统。该系统针对机车车体重量测试调整的痛点和难点,结合人工智能算法,设计具有自解算指导能力的调平量模拟系统,通过算法和... 详细信息

电力机车车体重量大、尺寸长,为了解决车体称重难题,文章设计了一种基于坐标系变换方法机车车体重量分布测量系统。该系统针对机车车体重量测试调整的痛点和难点,结合人工智能算法,设计具有自解算指导能力的调平量模拟系统,通过算法和经验可以快速得到加垫量的理论数值,并使用液压缸升降模拟加垫对理论加垫量进行验证。通过前期车体称重数据与模拟系统模拟称重的加垫量的数值进行比对,加垫量和称重数据趋势基本一致。

关键词：车体称重质心测量坐标变换模拟系统机车

大型集采中心设计——山东厨玛特国际商厨产业链一体化项目

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建筑技艺（中英文） 2024年第1期30卷 110-111页

作者：王宇雷应慧珺深圳中海世纪建筑设计有限公司滨州分公司设计院山东万事达建筑钢品股份有限公司

山东厨玛特国际商厨产业链一体化项目被称为商厨行业的“宜家”,从规划立意、空间设计、建筑形态、绿色建造等方面探讨大型集采中心的现代化空间设计理念。

关键词：商厨行业异形建筑绿色建造