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| 1 | Enhanced secondary pollution offset reduction of primary emissions during COVID-19 lockdown in China显示文摘To control the spread of the 2019 novel coronavirus(COVID-19),China imposed nationwide restrictions on the movement of its population(lockdown)after the Chinese New Year of 2020,leading to large reductions in economic activities and associated emissions.Despite such large decreases in primary pollution,there were nonetheless several periods of heavy haze pollution in eastern China,raising questions about the well-established relationship between human activities and air quality.Here,using comprehensive measurements and modeling,we show that the haze during the COVID lockdown was driven by enhancements of secondary pollution.In particular,large decreases in NOx emissions from transportation increased ozone and nighttime NO_(3)radical formation,and these increases in atmospheric oxidizing capacity in turn facilitated the formation of secondary particulate matter.Our results,afforded by the tragic natural experiment of the COVID-19 pandemic,indicate that haze mitigation depends upon a coordinated and balanced strategy for controlling multiple pollutants. | Xin Huang Aijun Ding Jian Gao Bo Zheng Derong Zhou Ximeng Qi Rong Tang Jiaping Wang Chuanhua Ren Wei Nie Xuguang Chi Zheng Xu Liangduo Chen Yuanyuan Li Fei Che Nini Pang Haikun Wang Dan Tong Wei Qin Wei Cheng Weijing Liu Qingyan Fu Baoxian Liu Fahe Chai Steven JDavis Qiang Zhang Kebin He | 2021 | National Science Review2021，8，2： | 47 |
| 2 | Design and manufacture AR head-mounted displays:A review and outlook显示文摘Augmented reality head-mounted displays(AR-HMDs)enable users to see real images of the outside world and visualize virtual information generated by a computer at any time and from any location,making them useful for various applications.The manufacture of AR-HMDs combines the fields of optical engineering,optical materials,optical coating,precision manufacturing,electronic science,computer science,physiology,ergonomics,etc.This paper primarily focuses on the optical engineering of AR-HMDs.Optical combiners and display devices are used to combine real-world and virtual-world objects that are visible to the human eye.In this review,existing AR-HMD optical solutions employed for optical combiners are divided into three categories:optical solutions based on macro-,micro-,and nanooptics.The physical principles,optical structure,performance parameters,and manufacturing process of different types of AR-HMD optical solutions are subsequently analyzed.Moreover,their advantages and disadvantages are investigated and evaluated.In addition,the bottlenecks and future development trends in the case of AR-HMD optical solutions are discussed. | Dewen Cheng Qiwei Wang Yue Liu Hailong Chen Dongwei Ni Ximeng Wang Cheng Yao Qichao Hou Weihong Hou Gang Luo Yongtian Wang | 2021 | Light(Advanced Manufacturing)2021，2，3： | 6 |
| 3 | Complex interplay between formation routes and natural organic matter modification controls capabilities of C_(60)nanoparticles(nC_(60)) to accumulate organic contaminants显示文摘Accumulation of organic contaminants on fullerene nanoparticles(nC_(60)) may significantly affect the risks of C_(60) in the environment.The objective of this study was to further understand how the interplay of nC_(60) formation routes and humic acid modification affects contaminant adsorption of nC_(60).Specifically,adsorption of 1,2,4,5-tetrachlorobenzene(a model nonionic,hydrophobic organic contaminant) on nC_(60) was greatly affected by nC_(60)formation route- the formation route significantly affected the aggregation properties of nC_(60),thus affecting the available surface area and the extent of adsorption via the pore-filling mechanism.Depending on whether nC_(60) was formed via the 'top-down' route(i.e.,sonicating C_(60) powder in aqueous solution) or 'bottom-up' route(i.e.,phase transfer from an organic solvent) and the type of solvent involved(toluene versus tetrahydrofuran),modification of nC_(60) with Suwannee River humic acid(SRHA) could either enhance or inhibit the adsorption affinity of nC_(60).The net effect depended on the specific way in which SRHA interacted with C_(60) monomers and/or C_(60) aggregates of different sizes and morphology,which determined the relative importance of enhanced adsorption from SRHA modification via preventing C_(60) aggregation and inhibited adsorption through blocking available adsorption sites.The findings further demonstrate the complex mechanisms controlling interactions between nC_(60) and organic contaminants,and may have significant implications for the life-cycle analysis and risk assessment of C_(60). | Lei Hou John D.Fortner Ximeng Wang Chengdong Zhang Lilin Wang Wei Chen | 2017 | Journal of Environmental Sciences2017，29，1： | 5 |
| 4 | Unfolding the fast neutron spectra of a BC501A liquid scintillation detector using GRAVEL method显示文摘Accurate knowledge of the neutron energy spectra is useful in basic research and applications. The overall procedure of measuring and unfolding the fast neutron energy spectra with BC501 A liquid scintillation detector is described. The recoil proton spectrum of 241Am-Be neutrons was obtained experimentally. With the NRESP7 code, the response matrix of detector was simulated.Combining the recoil proton spectrum and response matrix, the unfolding of neutron spectra was performed by GRAVEL iterative algorithm. A MatLab program based on the GRAVEL method was developed. The continuous neutron spectrum of 241Am-Be source and monoenergetic neutron spectrum of D-T source have been unfolded successfully and are in good agreement with their standard reference spectra. The unfolded 241Am-Be spectrum are more accurate than the spectra unfolded by artificial neural networks in recent years. | CHEN YongHao CHEN XiMeng LEI JiaRong AN Li ZHANG XiaoDong SHAO JianXiong ZHENG Pu WANG XinHua | 2014 | Science China(Physics,Mechanics & Astronomy)2014，57，10： | 3 |
| 5 | Preparation of cyano-functionalized multi- walled carbon nanotubes as solid-phase extraction sorbent for preconcentration of phenolic com- pounds in environmental water显示文摘 | GAO Wenhua SUN Ximeng CHEN Tufeng | 2012 | J Sep Sci2012，35，： | 1 |
| 6 | AWI-BS: An adaptive weight incentive for blockchain sharding显示文摘The sharding technique enables blockchain to process transactions in parallel by dividing blockchain nodes into small groups,each of which handles a subset of all transactions.One of the issues with blockchain sharding is generating a large number of cross-shard transactions that need to be checked on the output shard as well as the destination shard.Our analysis suggests that the processing efficiency of cross-shard transactions is consistent with the barrel effect,i.e.,that efficiency is more dependent on slower processing shard.Most of the existing studies focus on how to deal with cross-shard transactions,but neglecting the fact that the relative independence between sharding results in different incentive costs between sharding.We perform a sharding analysis on 100,000 real transactions data on Ethereum,and the results show that there is a large difference in gas prices between different shards indeed.In this paper,we propose an Adaptive Weight Incentive(AWI)for Blockchain Sharding,which uses adaptive weight in place of traditional incentive,to address the problem of differing incentive costs for each shard.Take Ethereum as an example,AWI-BS computes the weight of a transaction as a function of a combination of the underlying gas price,the latency of the transaction,and the urgency of the transaction.Then the node chooses which transaction to pack based on the AWI-BS.Lastly,we also perform an in-depth analysis of AWI-BS's security and effectiveness.The evaluation indicates that AWI-BS outperforms the other alternatives in terms of transaction confirmation latency,transaction hit rate,and system throughput. | Zuobin Ying Laican Song Deng Chen Wusong Lan Ximeng Liu | 2023 | Journal of Information and Intelligence2023，1，2： | 1 |
| 7 | Positron emission tomography detector performance with different crystal pitches显示文摘Aims:In this work,we evaluated the performance of three pitches positron emission tomography(PET)detectors for building a high-resolution small-animal PET imaging experimental platform.Methods:The evaluation of PET detectors includes twodimensional crystal identification,energy resolution,and crystal look-up table.The nuclear instrumentation module and PXI data acquisition(DAQ)system were both used to obtain flood images.The energy spectrum of the Na-22 source was measured.PET detectors of 2.0 and 1.6 mm pitches used in our present experiment were composed of lutetium yttrium oxyorthosilicate(LYSO)crystals directly coupled to position-sensitive photomultiplier tubes(PSPMTs).The 1.3-mm pitch detector comprises a LYSO crystal,a tapered light-guide,and a PSPMT.The crystal sizes of the detectors were a 10×10 array of 2.0×2.0×10 mm^(3) crystals,a 10×10 array of 1.6×1.6×10 mm^(3) crystals,and an 18×18 array of 1.3×1.3×10 mm^(3) crystals,respectively.Due to the lower sampling frequency of the DAQ system,a spline interpolation algorithm was introduced in the signal waveform to reconstruct the peak values.Results:The experimental results indicated that all three PET detector crystals could be clearly identified.A detailed analysis demonstrated that the key characteristic full width at half maximum(FWHM)values of the crystals profile could reach 0.46±0.03,0.32±0.03,and 0.21±0.02 mm,while the crystal average energy resolutions were 16.8%±1.76%,20.1%±2.24%,and 31.5%±3.76%,which correspond to pitches of 2.0-,1.6-,and 1.3-mm,respectively.Conclusions:The PET detector modules of LYSO crystal arrays could be potentially used in the small-animal PET imaging applications and are promising to achieve submillimeter PET images. | LinGe Tong YaMing Fan Ming Dong Liang Zhao ZhongXing Li YingGuo Li TianQuan Wang YongZhi Yin XiMeng Chen | 2017 | Radiation Detection Technology and Methods2017，1，2： | 1 |
| 8 | A novel 2-D random void model and its application in ultrasonically determined void content for composite materials显示文摘 | Li Lin Jun Chen Xiang Zhang Ximeng Li | 2010 | NDT and E International2010，，3： | 1 |
| 9 | Influences of drought on the stability of an alpine meadow ecosystem显示文摘Drought plays a prominent role in affecting ecosystem stability and ecosystem productivity.Based on eddy covariance and climatic observations during 2012-2020,the Fisher discriminant analysis method was employed to accurately detect drought occurrences.Furthermore,the ecosystem water sensitivity and its resistance to drought were quantified to evaluate the ecosystem stability.The results showed that the alpine meadow suffered drought most frequently at the beginning of the growing seasons.However,drought during the peak growing seasons reduced the gross primary productivity(GPP)the most,by 30.5±15.2%.In the middle of the peak growing seasons,the ecosystem water sensitivity was weak,and thus,the resistance to drought was strong,which resulted in high ecosystem stability.At the beginning and end of the peak growing seasons,the ecosystem stability was relatively weak.Ecosystem stability was positively related to the corresponding multiyear average soil water content(SWC_(ave)).However,drought occurring during high SWC_(ave)periods led to larger reductions in GPP,which indicated that the inhibitory effects of drought on ecosystems were more dependent on the occurrence time of droughts than on ecosystem stability. | Tao Zhang Ximeng Ji Mingjie Xu Guang Zhao Zhoutao Zheng Yuanyuan Tang Ning Chen Juntao Zhu Yongtao He Yangjian Zhang | 2022 | Ecosystem Health and Sustainability2022，8，1： | 0 |
| 10 | 4-13 Rydberg-to-M-shell X-ray Emission of Hollow Xe Atoms/ions above Metallic Surfaces显示文摘According to the classical over-barrier model[1;2], as a slow highly charged Xeq+ ion approaches a critical distance R =p 2q from the surface with the work function W, it begins to resonantly capture conduction electrons into high Rydberg states (principal quantum number around n q). | Song Zhangyong Yang Zhihu Zhang Hongqiang Shao Jianxiong Cui Ying Zhang Yanping Zhang Xiaoan Zhao Yongtao Chen Ximeng Xiao Guoqing | 2015 | IMP & HIRFL Annual Report2015，，1： | 0 |
| 11 | X-ray Production by on Selected Metal Ar^16+ Ions Impact Targets显示文摘 | Ruan Fangfang Yang Zhihu Song Zhangyong Cai Xiaohong Cui Ying Shao Jianxiong Du Juan Lui Liewen Chen Ximeng | 2006 | 近代物理研究所和兰州重离子加速器实验室年报:英文版2006，，1： | 0 |
| 12 | Bioinformatics analysis of SARS-CoV-2 infectionassociated immune injury and therapeutic prediction for COVID-19显示文摘Background:Severe acute respiratory syndrome coronavirus 2 is a highly contagious viral infection,without any available targeted therapies.The high mortality rate of COVID-19 is speculated to be related to immune damage.Methods:In this study,clinical bioinformatics analysis was conducted on transcriptome data of coronavirus infection.Results:Bioinformatics analysis revealed that the complex immune injury induced by coronavirus infection provoked dysfunction of numerous immune-related molecules and signaling pathways,including immune cells and toll-like receptor cascades.Production of numerous cytokines through the Th17 signaling pathway led to elevation in plasma levels of cytokines(including IL6,NF-kB,and TNF-a)followed by concurrent inflammatory storm,which mediates the autoimmune response.Several novel medications seemed to display therapeutic effects on immune damage associated with coronavirus infection.Conclusions:This study provided insights for further large-scale studies on the target therapy on reconciliation of immunological damage associated with COVID-19. | Haomin Zhang Haoran Chen Jundong Zhang Ximeng Chen Bin Guo Peng Zhi Zhuoyang Li Geliang Liu Bo Yang Xiaohua Chi Yixing Wang Feng Cao Jun Ren Xuechun Lu | 2021 | Emergency and Critical Care Medicine2021，1，1： | 0 |
| 13 | X-ray Emission from Zr, Mo, In and Pb Targets Bombarded by Slow Highly Charged Ar^(q+) (q=13, 14, 15, 16) Ions显示文摘Highly charged Arq+ (q=13, 14, 15, 16) ions were provided by a 14.5 GHz ECR ion source. Highly charged ions were extracted and m/q-selected (where m is the ion mass and q is the ion charge) by an analyzing magnet. The ion beams were charge state-selected again before entering into the target chamber by a 64°coaxial | Cai Xiaohong Yu Deyang Lu Rongchun Shao Caojie Lu Jun Ruan Fangfang Zhang Hongqiang Cui Ying Xu Xu Shao Jianxiong Ding Baowei Yang Zhihu Chen Ximeng | 2004 | 近代物理研究所和兰州重离子加速器实验室年报:英文版2004，，1： | 0 |
| 14 | Bare Isotope Ions ^(13)C^(6+) Collide with Helium, Neon and Argon in ECRIS Energies显示文摘Multi-electron process in highly charged ions colliding with atoms has been an active area since 1980s. Ion-Atom collision study is important not only to understand many-body interaction dynamics, but also be demanded by application research such as controlled fusion which is based on plasma physics. Bare ions are | Yu Deyang Cai Xiaohong Lu Rongchun Shao Caojie Lu Jun Ruan Fangfang Zhang Hongqiang Cui Ying Xu Xu Shao Jianxiong Ding Baowei Yang Zhihu Chen Ximeng | 2004 | 近代物理研究所和兰州重离子加速器实验室年报:英文版2004，，1： | 0 |
| 15 | X-ray spectra induced by ^(129)Xe^(q+) impacting the metal surface显示文摘Using the slow highly charged ions 129 Xe q+ (q=25,26,27;initial kinetic T0≤4.65 keV/a.u.)to impact Au surface,the Au atomic Mαcharacteristic X-ray spectrum is induced.The result shows that as long as the charge state of projectile is high enough,the heavy atomic characteristic X-ray can be effectively excited even though the incident beam is very weak(nA magnitude),and the X-ray yield per ion is in the order of 10-8and increases with the kinetic energy and potential energy of projectile.By measuring the Au Mα-X-ray spectra,Au atomic N-level lifetime is estimated at about 1.33×10-18s based on Heisenberg uncertainty relation. | ZHANG XiaoAn 1,2 ,XIAO GuoQing 1 ,YANG ZhiHu 1 ,CHEN XiMeng 3 ,ZHAO YongTao 1 , LI FuLi 4 ,WANG Li 1,2 ,CUI Ying 3 ,ZHANG HongQiang 3 &ZHAN WenLong 1 1Institute of Modern Physics,Chinese Academy of Sciences,Lanzhou 730000,China 2Department of Physics,Xianyang Normal University,Xianyang 712000,China 3Department of Modern Physics,Lanzhou University,Lanzhou 730000,China 4Department of Applied Physics,Xi’an Jiaotong University,Xi’an 710049,China | 2008 | Science China(Physics,Mechanics & Astronomy)2008，51，1： | 0 |
| 16 | 4-21 M X-ray Emission of Hollow Xeq+ Atoms above Metallic Surfaces显示文摘A highly charged ion (HCI) has a large potential energy, which is equal to the binding energies of all the elec-trons removed to create the ion. When such a slow HCI approaches and then enters into a solid surface, an \abovethe surface' and a \below the surface' hollow atom will be formed, respectively, by capturing electrons from thesurface into its empty levels. Not only new aspects of atom physics has been introduced by hollow atoms, but alsoHCI applications in material science has promising prospects, such as surface analysis, the synthesis of materialswith new properties, and the formation of nanostructure that have been an active area of research in recent years[1??6]. | Song Zhangyong Yang Zhihu Zhang Hongqiang Shao Jianxiong Cui Ying Zhang Yanping Zhang Xiaoan Zhao Yongtao Chen Ximeng Xiao Guoqing | 2014 | IMP & HIRFL Annual Report2014，，1： | 0 |
| 17 | Xenon Ions Guiding through Nanocapillaries in PC Foils显示文摘 | Wang Yuyu Li Dehui Zhao Yongtao Xiao Guoqing Chen Ximeng Xu Zhongfeng Li Fuli | 2008 | 近代物理研究所和兰州重离子加速器实验室年报:英文版2008，，1： | 0 |
| 18 | Vacant Level Structure (VLS) Dependence in Isocharged Sequence Ions Collision with Helium显示文摘In highly charged ions(HCI)-atom collisions, many electrons are active and much more channels are opened, and the collision dynamics therefore is much more complicated. Because of the complexity originated from many active electrons which are involved in HCI and atoms collisions, the full quantum treatment is rather difficult, whereas the simple classical over-the-barrier models and semiempirical | Yu Deyang Cai Xiaohong Lu Rongchun Ruan Fangfang Shao Caojie Lu Jun Zhang Hongqiang Cui Ying Xu Xu Shao Jianxiong Ding Baowei Yang Zhihu Chen Ximeng Liu Zhaoyuan | 2005 | 近代物理研究所和兰州重离子加速器实验室年报:英文版2005，，1： | 0 |
| 19 | Multi-electron Processes in ^(13)C^(6+) Ions with Neon Collisions in Energy Region 4.15~11.08 keV/u显示文摘The cross-section ratios-ofσDE/σSC,σTE/σSC,σQE/σSC andσME/σSC as well as the relative ratios among reaction channels in double-electron active, triple-electron active and quadruple-electron active are measured in I3C6+-Ne collision in the energy region of 4. 15-11. 08 keV/u by employing position-sensitive and timeof -flight coincident techniques. The bare isotope 13C6+ ions were provided by 14. 5 GHz ECR ion source | Ruan Fangfang Cai Xiaohong Yu Deyang Lu Rongchun Shao CaoJie Lu Jun Cui Ying Shao Jianxiong Xu Xu Zhang Hongqiang Ding Baowei Yang Zhihu Chen Ximeng | 2005 | 近代物理研究所和兰州重离子加速器实验室年报:英文版2005，，1： | 0 |
| 20 | M-X Ray of Ta Excited by Highly Charged Ar and Xe Ions显示文摘The X-ray spectra induced by the highly charged xenon and argon ions impinging on a tantalum surface are reported. The experiment was done at the ECR ion source of H1RFL. It is found that the yield of the tantalum M-X rays increases intensively as the projectile kinetic energy increasing. Moreover, the tantalum M-X ray induced by the xenon ions is higher in energy and broader in width than that induced by the argon ions (as shown in Figs. 1 and 2). | ZhaoYongtao Xiao Guoqing Zhang Xiaoan Yang Zhihu Li Fuli Chen Ximeng Zhang Yanping Zhan Wenlong | 2005 | 近代物理研究所和兰州重离子加速器实验室年报:英文版2005，，1： | 0 |
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