检索结果-南通市图书馆

Decoherence Effects of Terahertz Generation in Solids under Two-Color Femtosecond Laser Fields

在线全文

学校读者我要写书评

暂无评论

Chinese Physics Letters 2022年第5期39卷 36-41页

作者： Qifang peng zhaoyang peng Yue Lang Yalei Zhu Dongwen Zhang Zhihui Lü Zengxiu Zhao Department of Physics College of Liberal Arts and SciencesNational University of Defense TechnologyChangsha 410073China

We theoretically investigate terahertz emission from solid materials pumped by intense two-color femtosecond laser field in the presence of decoherence ***-mechanical simulations are based on the length gauge semiconductor Bloch equations describing the optical excitation and decoherence with phenomenological dephasing and depopulation *** of interband and intraband mechanisms are identified in time domain,and the latter has dominated THz generation in solid-state *** is found that dephasing is crucial for enhancing asymmetric intraband current and deduced that solid-state materials with short dephasing time and long depopulation time would be optimal selection for strong-field terahertz generation experiments.

关键词： pumped Femto Solid

Quantum Optical Description of Radiation by a Two-Level System in Strong Laser Fields

在线全文

学校读者我要写书评

暂无评论

Chinese Physics Letters 2023年第5期40卷 20-24页

作者：彭朝阳胡华雨赵增秀袁建民 Department of Physics National University of Defense TechnologyChangsha 410073China Department of Physics Graduate School of China Academy of Engineering PhysicsBeijing 100193China Hypervelocity Aerodynamics Institute China Aerodynamics Research and Development CenterMianyang 621000China

We develop a quantum optical description of radiation from a two-level system(TLS)in strong laser fields,which provides a clear insight into the final states of the TLS and the harmonics *** is shown that there are two emission channels:the Rayleigh-like channel and the Raman-like channel,which correspond to the TLS ending up in the ground state and excited state after the emission,*** numerical result shows that the harmonics are mainly produced by the Rayleigh-like *** addition,according to the coherence of emission among the emitters,the radiation is divided into coherent parts that result from the semi-classical dipole oscillation and incoherent parts that result from the quantum fluctuations of the dipole *** the weak field limits,the Rayleigh-like channel corresponds to the coherent parts,and the Raman-like channel corresponds to the incoherent ***,in strong laser fields,both channels contribute to coherent and incoherent radiation,and how much they contribute depends on the final *** manipulating the laser field,we can make the Rayleigh-like channel produce either coherent or incoherent radiation.

关键词： coherent harmonics dipole

在线全文

学校读者我要写书评

暂无评论

论党风建设方略的历史演进

理论学刊 2006年第8期 24-27页

作者：彭朝阳湖南人文科技学院湖南娄底417000

党风建设方略,就是根据形势发展需要而对党的作风建设制定的计划周密的方式方法和行动方针。党的第一代领导集体创建了着重从思想上政治上建设的党风建设方略,同时也注意按照民主集中制原则建立健全党内法规制度;第二代领导集体创建了... 详细信息

党风建设方略,就是根据形势发展需要而对党的作风建设制定的计划周密的方式方法和行动方针。党的第一代领导集体创建了着重从思想上政治上建设的党风建设方略,同时也注意按照民主集中制原则建立健全党内法规制度;第二代领导集体创建了依靠制度改革和建设的党风建设方略,同时又注重党的思想政治建设;第三代领导集体创建了思想政治建设与制度建设相结合的党风建设方略;以胡锦涛为总书记的党中央提出了“建立健全与社会主义市场经济体制相适应的教育、制度、监督并重的惩治和预防腐败体系”的党风廉政建设方略。党风建设方略必须与时俱进,才能使党永远立于不败之地。

关键词：党风建设方略思想政治建设制度建设监督制度建设体制机制创新

深度学习视域下以创意教具赋能科学教育——以“安培力定量探究演示仪”为例

在线全文

学校读者我要写书评

暂无评论

物理教学 2024年第8期46卷 28-34,21页

作者：关菲彭朝阳云南师范大学物理与电子信息学院云南650500

深度学习是践行科学教育的理论基础和实际载体。文章在深度学习视域下挖掘创意教具的多重属性,剖析创意教具与科学课堂的交互性,探索创意教具对传统物理实验的创新性,从而为我国科学教育的发展与改革提供有效思路。

关键词：科学教育深度学习创意教具物理实验

Crystal-Momentum-Resolved Contributions to Harmonics in Laser-Driven Graphene

在线全文

学校读者我要写书评

暂无评论

Chinese Physics Letters 2023年第5期40卷 47-51页

作者：彭朝阳郎跃朱雅蕾赵晶张栋文赵增秀袁建民 Department of Physics National University of Defense TechnologyChangsha 410073China Department of Physics Graduate School of China Academy of Engineering PhysicsBeijing 100193China

We investigate the crystal-momentum-resolved contributions to high-order harmonic generation in laser-driven graphene by semi-conductor Bloch equations in the velocity *** is shown that each harmonic is generated by electrons with the specific initial crystal *** higher harmonics are primarily contributed by the electrons of larger initial crystal momentum because they possess larger instantaneous energies during the intraband ***,we observe circular interference fringes in the crystal-momentum-resolved harmonics spectrum,which result from the inter-cycle interference of harmonic *** circular fringes will disappear if the inter-cycle interference is disrupted by the strong dephasing *** findings can help to better analyze the mechanism of high harmonics in graphene.

关键词： effect motion harmonics

Activation of adult endogenous neurogenesis by a hyaluronic acid collagen gel containing basic fibroblast growth factor promotes remodeling and functional recovery of the injured cerebral cortex

在线全文

学校读者我要写书评

暂无评论

Neural Regeneration Research 2025年第10期20卷 2923-2937页

作者： Yan Li peng Hao Hongmei Duan Fei Hao Wen Zhao Yudan Gao zhaoyang Yang Kwok-Fai So Xiaoguang Li Department of Neurobiology School of Basic Medical SciencesCapital Medical UniversityBeijingChina China Rehabilitation Science Institute China Rehabilitation Research CenterBeijing Key Laboratory of Neural Injury and RehabilitationBeijingChina Center of Neural Injury and Repair Beijing Institute for Brain DisordersBeijingChina Beijing Key Laboratory for Biomaterials and Neural Regeneration School of Engineering MedicineBeihang UniversityBeijingChina Guangdong-HongKong-Macao Institute of CNS Regeneration Ministry of Education CNS Regeneration Collaborative Joint LaboratoryJinan UniversityGuangzhouGuangdong ProvinceChina Bioland Laboratory(Guangzhou Regenerative Medicine and Health Guangdong Laboratory) GuangzhouGuangdong ProvinceChina Department of Ophthalmology and State Key Laboratory of Brain and Cognitive Sciences The University of Hong KongHong Kong Special Administration RegionChina Center for Brain Science and Brain-Inspired Intelligence Guangdong-HongKong-Macao Greater Bay AreaGuangzhouGuangdong ProvinceChina Co-innovation Center of Neuroregeneration Nantong UniversityNantongJiangsu ProvinceChina Department of Biomedical Engineering School of Biological Science and Medical EngineeringBeihang UniversityBeijingChina

The presence of endogenous neural stem/progenitor cells in the adult mammalian brain suggests that the central nervous system can be repaired and regenerated after ***,whether it is possible to stimulate neurogenesis and reconstruct cortical layers II to VI in non-neurogenic regions,such as the cortex,remains *** this study,we implanted a hyaluronic acid collagen gel loaded with basic fibroblast growth factor into the motor cortex immediately following traumatic *** findings reveal that this gel effectively stimulated the proliferation and migration of endogenous neural stem/progenitor cells,as well as their differentiation into mature and functionally integrated ***,these new neurons reconstructed the architecture of cortical layers II to VI,integrated into the existing neural circuitry,and ultimately led to improved brain *** findings offer novel insight into potential clinical treatments for traumatic cerebral cortex injuries.

关键词： adult endogenous neurogenesis basic fibroblast growth factor-hyaluronic acid collagen gel cortical remodeling functional recovery migration motor cortex injury neural circuits neural stem cells newborn neurons proliferation

艺术类高职学生思想政治教育的特点与路径选择

在线全文

学校读者我要写书评

暂无评论

当代教育论坛 2015年第4期 69-75页

作者：彭朝阳湖南艺术职业学院

文章分析了艺术类高职学生及其思想政治教育的特点,并在此基础上提出了艺术类高职学生思想政治教育的路径:动态把握艺术类高职学生的时代变化是前提;共性与个性结合,及时完善艺术类高职学生思想政治教育的理念与制度是关键;追踪调查,及... 详细信息

文章分析了艺术类高职学生及其思想政治教育的特点,并在此基础上提出了艺术类高职学生思想政治教育的路径:动态把握艺术类高职学生的时代变化是前提;共性与个性结合,及时完善艺术类高职学生思想政治教育的理念与制度是关键;追踪调查,及时检验与修正艺术类高职学生思想政治教育的效果是根本目标。

关键词：艺术类高职学生思想政治教育特点路径选择

在线全文

学校读者我要写书评

暂无评论

吉林森工集团利润的质量分析

西南林业大学学报（社会科学） 2017年第4期1卷 71-77页

作者：彭朝阳西南林业大学经济管理学院云南昆明650224

以吉林森工集团为研究对象,选取2011—2015年财务报表数据,从企业核心利润实现过程质量、利润结构质量和利润结果质量三个方面进行全方位、深层次、多角度的分析与评价,并得出相关的结论,意在促使其提升利润质量、提高经济效益。结果表... 详细信息

以吉林森工集团为研究对象,选取2011—2015年财务报表数据,从企业核心利润实现过程质量、利润结构质量和利润结果质量三个方面进行全方位、深层次、多角度的分析与评价,并得出相关的结论,意在促使其提升利润质量、提高经济效益。结果表明:吉林森工集团对产品和地区的依赖性较强,对管理费用的控制能力较弱。公司主营产品的毛利率偏低、对外投资的盈利能力远高于经营资产的盈利能力,而且公司经营利润没能够创造出足够的现金流量以及利润结构与资产结构匹配性较差。公司自身盈利能力处于同行业的较低水平,总体来说公司的利润质量较差。

关键词：吉林森工集团利润质量结构

在线全文

学校读者我要写书评

暂无评论

三稳态压电-电磁复合能量采集器性能研究

压电与声光 2023年第6期45卷 872-877页

作者：彭召洋宋芳熊玉仲上海工程技术大学机械与汽车工程学院上海201620 上海艾为电子技术股份有限公司上海201199

为了提高双稳态压电电磁复合能量采集器(BPEEH)的能量转换性能和转换效率,该文在典型BPEEH的基础上,提出了一种新颖的三稳态压电电磁复合能量采集器(TPEEH)。与传统的BPEEH相比,其兼有一个新颖的电磁发电装置,进一步构成三稳态系统。该... 详细信息

为了提高双稳态压电电磁复合能量采集器(BPEEH)的能量转换性能和转换效率,该文在典型BPEEH的基础上,提出了一种新颖的三稳态压电电磁复合能量采集器(TPEEH)。与传统的BPEEH相比,其兼有一个新颖的电磁发电装置,进一步构成三稳态系统。该文通过对TPEEH结构装置建立数学模型,进行了数值分析,并得到该采集器系统的势能变化函数。在此基础上,通过实验验证了外界激励频率、磁铁间距及电路负载电阻对该采集器输出电压和功率的影响。实验结果表明,当磁距为16 mm,外部磁间距为26 mm,外部激励频率为10.2 Hz时,TPEEH采集器有最大的输出电压(为6.3489 V),同时在外部负载电阻为500Ω时,采集器获得最大输出功率(为0.08 W)。与传统的BPEEH采集器相比,TPEEH采集器的采集谐振频率低,采集频带宽,输出电压和功率高,从而提高了能量转换性能和效率。

关键词：压电电磁三稳态数学模型复合能量采集器