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Extreme single-excitation subradiance from two-band Bloch oscillations in atomic arrays

Photonics Research 2024年第3期12卷 571-580页

作者： luojia wang DA-WEI wang LUQI YUAN YAPING YANG XIANFENG CHEN State Key Laboratory of Advanced Optical Communication Systems and Networks School of Physics and AstronomyShanghai Jiao Tong UniversityShanghai 200240China Interdisciplinary Center for Quantum Information and State Key Laboratory of Modern Optical Instrumentation Zhejiang Province Key Laboratory of Quantum Technology and Deviceand School of PhysicsZhejiang UniversityHangzhou 310027China MOE Key Laboratory of Advanced Micro-Structured Materials School of Physics Science and EngineeringTongji UniversityShanghai 200092China Shanghai Research Center for Quantum Sciences Shanghai 201315China Collaborative Innovation Center of Light Manipulations and Applications Shandong Normal UniversityJinan 250358China

Atomic arrays provide an important quantum optical platform with photon-mediated dipole–dipole interactions that can be engineered to realize key applications in quantum information processing.A major obstacle for such applications is the fast decay of the excited *** controlling two-band Bloch oscillations of single excitation in an atomic array under an external magnetic field,here we show that exotic subradiance can be realized and maintained with orders of magnitude longer than the spontaneous decay time in atomic arrays with the finite *** key finding is to show a way for preventing the wavepacket of excited states scattering into the dissipative zone inside the free space light cone,which therefore leads to the excitation staying at a subradiant state for an extremely long decay *** show that such operation can be achieved by introducing a spatially linear potential from the external magnetic field in the atomic arrays and then manipulating interconnected two-band Bloch oscillations along opposite *** results also point out the possibility of controllable switching between superradiant and subradiant states,which leads to potential applications in quantum storage.

关键词： excitation Bloch decay

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风光电解水制氢平准化成本优化空间分析

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广东电力 2024年第7期37卷 22-31页

作者：邓振宇张润之张文韬徐钢王珞珈华北电力大学能源动力与机械工程学院北京102206 国网北京昌平供电公司北京102200

氢能是中国绿色低碳能源体系的组成部分和“双碳”目标实现的关键载体,其未来可持续发展是以电解水生产的“绿氢”为方向,但目前针对可再生能源制“绿氢”的最新平准化成本以及成本优化空间较少受关注。对此,基于我国制氢行业最新数据... 详细信息

氢能是中国绿色低碳能源体系的组成部分和“双碳”目标实现的关键载体,其未来可持续发展是以电解水生产的“绿氢”为方向,但目前针对可再生能源制“绿氢”的最新平准化成本以及成本优化空间较少受关注。对此,基于我国制氢行业最新数据计算出“绿氢”最新平准化成本,并对系统发电侧和制氢侧成本优化空间进行分析,最后开展敏感性分析。结果表明:我国“绿氢”最新平准化价格为20元/kg,已接近目前传统化石原料生产的“灰氢”成本,综合发电侧和制氢侧成本优化空间,至2030年可使氢气平准化成本下降48%左右,达到10.4元/kg;电价敏感性方面,风光电价每降低0.02元/kWh,氢气平准化成本降低约1.2元/kg。

关键词：风光电解水制氢平准化成本成本优化空间分析绿氢敏感性分析

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Identifying the Geography and Determinants of O2O Online Retailers in Megacity in Central China:A Case Study of Zhengzhou City

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Chinese Geographical Science 2021年第5期31卷 931-950页

作者： QI Jinghui NIU Shuwen YE Chenxi wang luojia WEl Yongna WEN Yuzhao ZHAO Shuling College of Civil Engineering and ArchitecturelCollaborative Imnovation Center for Aviation Economy Development Zhengzhou University of AeronauticsZhengzhou 450046China College of Earth and Environmental Sciences Lanzhou UniversityLanzhou 730000China School of Business Zhengzhou University of AeronauticsZhengzhou 450046China School of Economics Lanzhou University of Finance and EconomicsLanzhou 730101China College of Environment and Planning Henan UniversityKaifeng 475004China College of Resource and Environment Henan University of Economics and LawZhengzhou 450046China

In recent years,O2O e-commerce,represented by online group-buying,has developed vigorously,which had significant impacts on urban commercial *** City is a rising national central city in China,and its e-commerce development level is ahead,but relevant researches are ***,the data of online retailers of *** was collected and combined with Baidu map and Baidu heat map ***,we adopted the methods such as spatial statistics and geodetector to explore the geography and determinants of O2O online retailers in Zhengzhou urban *** main conclusions are 1)The spatial development of O2O online retailers is characterized by significant global high-value agglomeration.2)The agglomeration areas of different types of O2O online retailers are *** of them are concentrated in the old urban area within the Third Ring Road of Zhengzhou City,forming five comprehensive agglomeration areas.3)The areas with the high e-commerce development level are mainly concentrated in the northeast and southwest of the x-shaped region formed by the intersection of Lianyungang-Lanzhou and Beijing-Guangzhou *** Square and Guomao 360 Plaza are at the highest development level,followed by Zhongyuan Wanda Plaza and Daxue Middle *** development level at other areas is relatively low.4)Zhengzhou’s O2O commercial pattern is highly dependent on physical *** population distribution,especially the population distribution during the nightlife period,plays a vital role in its spatial development,followed by *** influences of physical distance are slightly larger than that of time cost,but the difference between them is *** addition,travelling costs have the least *** paper could provide certain references for urban commercial planning.

关键词： O2O online retailers geodetector kernel density spatial development Zhengzhou City China

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Exposure to ephedrine attenuates Th1/Th2 imbalance underlying OVA-induced asthma through airway epithelial cell-derived exo-somal lnc-TRPM2-AS

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Chinese Journal of Natural Medicines 2024年第6期22卷 530-540页

作者： HU Yan wang Mengqing XIE Jing JIAO luojia DING Yi LUO Yinhe Department of Pediatrics The First Hospital of Hunan University of Chinese MedicineChangsha 410007China Hunan University of Chinese Medicine Changsha 410208China Department of Rehabilitation Medical CollegeChangsha Civil Affairs Vocational and Technical CollegeChangsha 410004Hunan ProvinceChina Teaching and Research Office of Chinese and Western Combination Hunan University of Chinese MedicineChangsha 410208China

Although various anti-inflammatory medications,such as ephedrine,are employed to manage cough-variant asthma,their underlying mechanisms are yet to be fully *** studies suggest that exosomes derived from airway epithelial cells(AECs)contain components like messenger RNAs(mRNAs),micro-RNAs(miRNAs),and long noncoding RNA(lncRNA),which play roles in the occurrence and progression of airway *** study investigates the influence of AEC-derived exosomes on the efficacy of ephedrine in treating cough-variant *** established a mouse model of asthma and measured airway resist-ance and serum inflammatory cell ***-time polymerase chain reaction(RT-qPCR),Western blotting,and enzyme-linked im-munosorbent assay(ELISA)analyses were used to assess gene and protein expression *** were isolated and *** immunoprecipitation(RIP)and RNA pull-down assays were conducted to examine the interaction between hnRNPA2B1 and *** the ovalbumin(OVA)-challenged mouse model,ephedrine treatment reduced inflammatory responses,air-way resistance,and Th1/Th2 cell *** from OVA-treated AECs showed elevated levels of lnc-TRPM2-AS1,which were diminished following ephedrine *** exosomal lnc-TRPM2-AS1 mediated the Th1/Th2 imbalance in CD4^(+)T cells,with its packaging into exosomes being facilitated by *** study unveils a novel mechanism by which ephedrine ameli-orates OVA-induced CD4^(+)T cell imbalance by suppressing AEC-derived exosomal *** findings could provide a theoretical framework for using ephedrine in asthma treatment.

关键词： Asthma Ephedrine Exosomal lnc-TRPM2-AS1 Th1/Th2 imbalance HnRNPA2B1 Airway epithelial cells

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Energy rebound effect in China's manufacturing sector:Fresh evidence fromfirm-level data

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Frontiers of Engineering Management 2022年第3期9卷 439-451页

作者： Zicheng ZHOU luojia wang Kerui DU Shuai SHAO School of Public Affairs Zhejiang UniversityHangzhou 310058China School of Management China Institute for Studies in Energy PolicyXiamen UniversityXiamen 361005China School of Business East China University of Science and TechnologyShanghai 200237China

The rebound effect refers to the phenomenon that individuals tend to consume more energy in the face of energy efficiency improvement,which reduces the expected energy-saving *** empirical studies on the rebound effect of regions and sectors do not provide microscopic *** fill this gap,we use China's firmlevel data to estimate the rebound effect in China's manufacturing subsectors,providing a detailed picture of China's rebound effect across different sectors and different regions in *** show that a partial rebound effect robustly appears in all industries,and the disparity between sectors is quite broad,ranging from 43.2%to 96.8%.As for the dynamic rebound effect of subsectors,most subsectors present an upward trend,whereas few subsectors show a clear downward *** a whole,the declined trend of the rebound effect is driven by the descent of minority sectors with high energy consumption and high energy-saving *** addition,we find that the disparity of the rebound effect across sectors is more significant than that across regions.

关键词： energy rebound effect energy efficiency manufacturing sector firm-level data China

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Observation of flat-band and band transition in the synthetic space

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Advanced Photonics 2022年第3期4卷 114-121页

作者： Guangzhen Li luojia wang Rui Ye Shijie Liu Yuanlin Zheng Luqi Yuan Xianfeng Chen Shanghai Jiao Tong University School of Physics and AstronomyState Key Laboratory of Advanced Optical Communication Systems and NetworksShanghaiChina Shanghai Research Center for Quantum Sciences ShanghaiChina Shandong Normal University Collaborative Innovation Center of Light Manipulation and ApplicationsJinanChina

.Constructions of synthetic lattices in modulated ring resonators attract growing attention to interesting physics beyond the geometric dimensionality,where complicated connectivities between resonant frequency modes are explored in many theoretical *** implement experimental demonstration of generating a stub lattice along the frequency axis of light,in two coupled ring resonators of different lengths,with the longer one dynamically *** a synthetic photonic structure intrinsically exhibits the physics of flat *** show that the time-resolved band structure read-out from the drop-port output of the excited ring is the intensity projection of the band structure onto a specific resonant mode in the synthetic momentum space,where gapped flat band,mode localization effect,and flat-to-nonflat band transition are observed in experiments and verified by *** work provides evidence for constructing a synthetic stub lattice using two different rings,which,hence,makes a solid step toward experimentally constructing complicated lattices in multiple rings associated with synthetic frequency dimensions.

关键词： synthetic dimensions ring resonators dynamic modulation flat band.

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Direct extraction of topological Zak phase with the synthetic dimension

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Light(Science & Applications) 2023年第4期12卷 671-679页

作者： Guangzhen Li luojia wang Rui Ye Yuanlin Zheng Da-Wei wang Xiong-Jun Liu Avik Dutt Luqi Yuan Xianfeng Chen State Key Laboratory of Advanced Optical Communication Systems and Networks School of Physics and AstronomyShanghai Jiao Tong UniversityShanghai 200240China Shanghai Research Center for Quantum Sciences Shanghai 201315China Interdisciplinary Center for Quantum Information and Zhejiang Province Key Laboratory of Quantum Technology and Device Department of PhysicsZhejiang UniversityHangzhou 310027China InternationalCenter for Quantum Materials and School of Physics Peking UniversityBeijing 100871China International Quantum Academy Shenzhen 518048China Department of Mechanical Engineering Institute for Physical Science and TechnologyUniversity of MarylandCollege ParkMD 20742USA Collaborative Innovation Center of Light Manipulation and Applications Shandong Normal UniversityJinan 250358China

Measuring topological invariants is an essential task in characterizing topological phases of *** are usually obtained from the number of edge states due to the bulk-edge correspondence or from interference since they are integrals of the geometric phases in the energy *** is commonly believed that the bulk band structures could not be directly used to obtain the topological ***,we implement the experimental extraction of Zak phase from the bulk band structures of a Su-Schrieffer-Heeger(SSH)model in the synthetic frequency *** synthetic SSH lattices are constructed in the frequency axis of light,by controlling the coupling strengths between the symmetric and antisymmetric supermodes of two bichromatically driven *** measure the transmission spectra and obtain the projection of the time-resolved band structure on lattice sites,where a strong contrast between the non-trivial and trivial topological phases is *** topological Zak phase is naturally encoded in the bulk band structures of the synthetic SSH lattices,which can hence be experimentally extracted from the transmission spectra in a fiber-based modulated ring platform using a laser with telecom *** method of extracting topological phases from the bulk band structure can be further extended to characterize topological invariants in higher dimensions,while the exhibited trivial and non-trivial transmission spectra from the topological transition may find future applications in optical communications.

关键词： topological trivial synthetic

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芳香硝基化合物可降解性研究

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华中科技大学学报（医学版） 1992年第S1期26卷 14-16页

作者：运珞珈王家玲同济医科大学公共卫生学院同济医科大学环境医学研究所

经过驯育得到具有降解芳香硝基化合物能力的混合菌群及6种单一菌株。在好氧条件下,芳香硝基化合物浓度为600mg/L肘,混合菌群对其降解率,24h为77.6％,48h为88.2％以上。而6种单一菌株对芳香硝基化合物的降解率,48h均在20.0％～21.6％间... 详细信息

经过驯育得到具有降解芳香硝基化合物能力的混合菌群及6种单一菌株。在好氧条件下,芳香硝基化合物浓度为600mg/L肘,混合菌群对其降解率,24h为77.6％,48h为88.2％以上。而6种单一菌株对芳香硝基化合物的降解率,48h均在20.0％～21.6％间。该驯育菌群降解芳香硝基化合物的适宜条件为:好氧.温度25～30℃,不加外源碳、氮营养,只加少量磷酸盐及镁盐。

关键词：芳香硝基化合物训育菌群生物降解

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对中国宜居生态城市的再认识

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城市观察 2015年第4期 160-171页

作者：王珞珈董晓峰兰州大学资源与环境学院北京交通大学

生态城市、宜居城市是国外社会经济发展到一定阶段后人们为追求更高的生活质量而制定的城市发展战略,也是中国等发展中国家为了及时纠正城市化迅速发展过程中所产生的弊病,实现城市转型的重要发展策略。众所周知,中国的城市化进程在21... 详细信息

生态城市、宜居城市是国外社会经济发展到一定阶段后人们为追求更高的生活质量而制定的城市发展战略,也是中国等发展中国家为了及时纠正城市化迅速发展过程中所产生的弊病,实现城市转型的重要发展策略。众所周知,中国的城市化进程在21世纪对世界的影响力巨大,生态宜居城市作为影响城市化健康可持续发展的重要策略之一,其理论和实践过程必将成为具有中国特色的典型模式。

关键词：中国特色生态宜居再认识

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生态视角下的城市空间结构理论研究

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城市学刊 2015年第6期36卷 25-30页

作者：王珞珈董晓峰兰州大学资源环境学院甘肃兰州730000 北京交通大学建筑与艺术学院北京100044

古往今来,探索合理的城市空间与自然的关系一直是人类孜孜不倦的追求。21世纪以来,生态思想更是深入人心。在生态城市逐渐被人们认知,并公认为城市理想发展模式的今天,强调与自然融合的城市空间模式,构建一个科学合理的城市空间结构体系... 详细信息

古往今来,探索合理的城市空间与自然的关系一直是人类孜孜不倦的追求。21世纪以来,生态思想更是深入人心。在生态城市逐渐被人们认知,并公认为城市理想发展模式的今天,强调与自然融合的城市空间模式,构建一个科学合理的城市空间结构体系,逐渐成为国内外城市学者和建设者研究的热点。从生态视角下城市空间结构研究的理论基础来看,学术思想渊源有着悠久的历史,但却缺乏系统性的既定模式,所以对其进行总结十分必要。

关键词：生态生态城市城市空间结构

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