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Design study of charge-stripping scheme of heavy ion beams for HIAF-BRing

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Nuclear Science and Techniques 2024年第5期35卷 30-41页

作者： Jun-Jie Zhang Zhi-You Xu Jin-Quan Zhang wen-wen Ge Liang-Ting Sun huan-Yu Zhao Institute of Modern Physics Chinese Academy of SciencesLanzhou 730000China School of Nuclear Science and Technology University of Chinese Academy of SciencesBeijing 100049China

Charge strippers play an essential role in heavy-ion accelerators by stripping the projectile ions to higher charge states to enhance the acceleration efficiency downstream of the *** the high-energy mode of the booster ring(BRing)of the high-intensity heavy-ion accelerator facility,the pre-accelerated ions from the iLinac will be stripped by a carbon foil to higher charge states and then injected into the *** key parameters of the stripper and stripped ions were calculated,and the influence of stripping on the beam quality was *** get high stripping efficiencies,the foil thicknesses and resultant charge state distributions for the typical ions were determined by the code *** equilibrium thickness was obtained for the U beam,while the stripper thicknesses for the Xe and Kr beams were determined based on a compromise between the stripped charge states and the stripping *** energy loss,energy straggling,and emittance growth due to stripping have a non-negligible impact on the transport of the stripped beams and the injection of the ***,these parameters were simulated by *** addition,the foil’s temperature evolution,which greatly affects the foil lifetime,was simulated by *** maximum temperature of the foil bombarded by the U and Xe beams with the nominal parameters will exceed the safe value in terms of the impact of evaporation on the foil’s *** the foil temperature constraint,the highest tolerable beam intensity and the injected ion number into the ring were derived for different beam *** results of this paper will present important reference data for the optimization design and commissioning of the beamline and injection to the BRing for the stripped ions.

关键词： High-intensity heavy-ion accelerator facility Charge stripper Energy spread Thermal analysis Emittance growth Injection turns

Phyllosphere eukaryotic microalgal communities in rainforests:Drivers and diversity

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Plant Diversity 2023年第1期45卷 45-53页

作者： Ben-wen Liu Shu-Yin Li huan Zhu Guo-Xiang Liu Key Laboratory of Algal Biology Institute of HydrobiologyChinese Academy of SciencesWuhan 430072China Yangtze River Basin Ecological Environment Monitoring and Scientific Research Center Yangtze River Basin Ecological Environment Supervision and Administration BureauMinistry of Ecological EnvironmentWuhan 430072China

Phyllosphere algae are common in tropical rainforests,forming visible biofilms or spots on plant leaf ***,knowledge of phyllosphere algal diversity and the environmental factors that drive that diversity is *** aim of this study is to identify the environmental factors that drive phyllosphere algal community composition and diversity in *** this purpose,we used single molecule real-time sequencing of full-length 18S rDNA to characterize the composition of phyllosphere microalgal communities growing on four host tree species(Ficus tikoua,Caryota mitis,Arenga pinnata,and Musa acuminata) common to three types of forest over four months at the Xishuangbanna Tropical Botanical Garden,Yunnan Province,*** 18S rDNA sequences revealed that the green algae orders Watanabeales and Trentepohliales were dominant in almost all algal communities and that phyllosphere algal species richness and biomass were lower in planted forest than in primeval and reserve *** addition,algal community composition differed significantly between planted forest and primeval *** also found that algal communities were affected by soluble reactive phosphorous,total nitrogen,and ammonium *** findings indicate that algal community structure is significantly related to forest type and host tree ***,this study is the first to identify environmental factors that affect phyllosphere algal communities,significantly contributing to future taxonomic research,especially for the green algae orders Watanabeales and *** research also serves as an important reference for molecular diversity analysis of algae in other specific habitats,such as epiphytic algae and soil algae.

关键词： Full-length 18S rDNA sequences Cryptic diversity Environmental factors High-throughput sequence Phyllosphere algae Tropical rainforest

Distinct neuron populations for simple and compound calls in the primary auditory cortex of awake marmosets

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National Science Review 2021年第11期8卷 92-101页

作者： huan-huan Zeng Jun-feng huang Jun-ru Li Zhiming Shen Neng Gong Yun-qing wen Liping Wang Mu-ming Poo Center for Excellence in Brain Science and Intelligence Technology Institute of NeuroscienceState Key Laboratory of Neuroscience CAS Key Laboratory of Primate NeurobiologyChinese Academy of Sciences Shanghai Center for Brain Science and Brain-Inspired Intelligence Technology University of Chinese Academy of Sciences

Marmosets are highly social non-human primates that live in families. They exhibit rich vocalization, but the neural basis underlying this complex vocal communication is largely unknown. Here we report the existence of specific neuron populations in marmoset A1 that respond selectively to distinct simple or compound calls made by conspecific marmosets. These neurons were spatially dispersed within A1 but distinct from those responsive to pure tones. Call-selective responses were markedly diminished when individual domains of the call were deleted or the domain sequence was altered, indicating the importance of the global rather than local spectral-temporal properties of the sound. Compound call-selective responses also disappeared when the sequence of the two simple-call components was reversed or their interval was extended beyond 1 s. Light anesthesia largely abolished call-selective responses. our findings demonstrate extensive inhibitory and facilitatory interactions among call-evoked responses, and provide the basis for further study of circuit mechanisms underlying vocal communication in awake non-human primates.

关键词： marmoset calls calcium imaging awake marmosets primary auditory cortex vocal communication

Metal-organic framework[NH_(2)-MIL-53(Al)]functionalized TiO_(2)nanotube photoanodes for highly stable and efficient photoelectrochemical cathodic protection of nickel-coated Mg alloy

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Journal of Materials Science & Technology 2024年第15期182卷 67-78页

作者： huan Yao Ruifeng Zhang Yu wen Yue Liu Gang Yu Zhi-Hui Xie Chemical Synthesis and Pollution Control Key Laboratory of Sichuan Province College of Chemistry and Chemical EngineeringChina West Normal UniversityNanchong 637002China School of Materials Science and Engineering Central South UniversityChangsha 410083China State Key Laboratory of Chemo/Biosensing and Chemometrics College of Chemistry and Chemical EngineeringHunan UniversityChangsha 410082China

Metal-organic framework[MOF,i.e.,NH_(2)-MIL-53(Al)]modified TiO_(2)(NMT)composite photoanodes were successfully prepared by hydrothermal synthesis and were used for the photoelectrochemical cathodic protection(PECCP)of nickel-plated magnesium alloy(Mg/Ni).Results showed that the synthesis tem-perature significantly impacted the morphology and PECCP performance of the NMT *** NMT@150 photoanode prepared at a reaction temperature of 150℃exhibited the best PECCP perfor-mance and produced a current density of 1980μA cm^(-2)under visible light irradiation,which was 19.8 times higher than that of a single TiO_(2)*** composite photoanode could polarize the open circuit potential of the coupled Mg/Ni electrode to-876 mV and remain relatively stable within 35 *** and EPR tests showed that a Z-scheme heterojunction was formed between the NH_(2)-MIL-53(Al)and TiO_(2)nanotubes,allowing the photogenerated electrons to accumulate mainly on the conduction band of NH_(2)-MIL-53(Al).The heterojunction greatly promoted the separation and transfer of photogenerated electron-hole in the NMT composite photoanode,significantly enhancing the PECCP performance for Mg/Ni.

关键词： Magnesium alloy Corrosion Nickel coating Electroless Photoelectrochemical cathodic protection

A regression approach for seismic first-break picking

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Petroleum Science 2024年第3期21卷 1584-1596页

作者： huan Yuan San-Yi Yuan Jie Wu wen-Jing Sang Yu-He Zhao CNPC Key Laboratory of Geophysical Exploration China University of Petroleum(Beijing)Beijing 102249China Research Institute of Petroleum Exploration&Development—Northwest(NWGI) Key Laboratory of reservoir characterization of CNPCPetroChinaLanzhou 730020GansuChina

The picking efficiency of seismic first breaks(FBs)has been greatly accelerated by deep learning(DL)***,the picking accuracy and efficiency of DL methods still face huge challenges in low signal-to-noise ratio(SNR)*** address this issue,we propose a regression approach to pick FBs based on bidirectional long short-term memory(Bi LSTM)neural network by learning the implicit Eikonal equation of 3D inhomogeneous media with rugged topography in the target *** employ a regressive model that represents the relationships among the elevation of shots,offset and the elevation of receivers with their seismic traveltime to predict the unknown FBs,from common-shot gathers with sparsely distributed *** from image segmentation methods which automatically extract image features and classify FBs from seismic data,the proposed method can learn the inner relationship between field geometry and *** addition,the predicted results by the regressive model are continuous values of FBs rather than the discrete ones of the binary *** picking results of synthetic data shows that the proposed method has low dependence on label data,and can obtain reliable and similar predicted results using two types of label data with large *** picking results of9380 shots for 3D seismic data generated by vibroseis indicate that the proposed method can still accurately predict FBs in low SNR *** subsequent stacked profiles further illustrate the reliability and effectiveness of the proposed *** results of model data and field seismic data demonstrate that the proposed regression method is a robust first-break picker with high potential for field application.

关键词： First-break picking Low signal-to-noiseratio Regression BiLSTM Traveltime Geometry Noisy seismic data

Coherent effects in a three-photon CPT process of Ca＋

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Frontiers of physics 2011年第3期6卷 258-261页

作者： Qu LIU Bao-quan ou Xi-wen ZHU Ke-lin GAO State Key Laboratory of Magnetic Resonance and Atornic and Molecular Physics Wuhan lnstitute of Physics and Mathematics （WIPM） Chinese Academy of Sciences （CAS） Wuhan 430071 China Centers for Cold Atom Physics CAS Wuhan 430071 China Graduate School of the Chinese Academy of Sciences Beijing 100049 China Department of Physics Science College National University of Defense Technology Changsha 410073 China

Linewidth narrowing and other quantum coherent effects based on three-photon coherent population trapping （CPT） in Ca＋ ions are investigated. If the propagation directions of the three lasers obey the phase matching condition, the dark linewidth resulting from the CPT can be very narrow, and it can be controlled by adjusting the parameters of the lasers.

关键词： coherent population trapping (CPT) linewidth coherent effects

Syntheses and Structures of Two Macrocyclic Nickel(Ⅱ) Complexes Bridging Benzene Polycarboxylic Acid

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Chinese Journal of Structural Chemistry 2015年第5期34卷 749-756页

作者： ou Guang-Chuan LI wen-Yi YUAN Xian-You LI Zhi-Zhang Department of Biology and Chemistry Hunan University of Science and Engineering

Two complexes with formulas [Ni L][（Ni L）（IPA）2]·8H2O（1） and [（Ni L）（H2O）2] [（Ni L）（PMA）]·4H2O（2）（L = 5,5,7,12,12,14-hexamethyl-1,4,8,11-tetraazacyclotetradecane,IPA2– = isophthalic anion,PMA4– = 1,2,4,5-benzenetetracarboxylic anion） were synthesized and characterized by elemental analyses and IR *** crystal structures were determined by X-ray *** complex 1,the [Ni L]^2＋ bridged IPA^2– to give [（Ni L）（IPA）2]^2– monomer,and the [Ni L]^2＋ bridged PMA4– to form a one-dimensional chain [（Ni L）（PMA）]n^2n– in complex *** [Ni L]^2＋ and [（Ni L）（IPA）2]^2–/[（Ni L）（PMA）]^2– are connected through intermolecular hydrogen bonding to generate three-dimensional supramolecular structures.

关键词： macrocyclic nickel(Ⅱ) complexes isophthalic 1 2 4 5-benzenetetracarboxylic

Phase-field method for growth of iron whiskers in the presence of CO gas convection

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Journal of Iron and Steel Research International 2019年第8期26卷 829-837页

作者： Feng Lu Liang-ying wen Xu Han wen-huan Jiang Hua-mei Duan Jian Xu Sheng-fu Zhang School of Materials Science and Engineering Chongqing University Chongqing 400044 China Chongqing Key Laboratory of Vanadium-Titanium Metallurgy and Advanced Materials Chongqing University Chongqing 400044 China

A phase-field model for growth of iron whiskers that includes convection around a particle was investigated during the process of fluidized pre-reduction. In the simulations, the phase-field method was coupled with flow field and reduction of iron oxide particles. The results showed that the reduction rate at local place had significant effects on the iron ions diffusion and the iron whiskers were more easily grown on the area containing low mole fraction of oxygen. The growth of iron whiskers in the model was investigated in two important simple situations: a velocity change flow and a CO concentration change flow. Because of high reduction rate and low surface energy, iron whiskers were more easily grown on the windward surface and the length of iron whiskers increased with gas velocity increasing. However, both the length and numbers of iron whiskers increased with CO concentration increasing due to the more nucleation site of iron whiskers created by CO adsorbed. When the gas velocity is higher than 0.3 m/s or CO mole fraction is high than 0.6, the nucleation incubation time would be rapidly decreased, which could give suggestions to control the operational parameters in the fluidized pre-reduction process.

关键词： Iron whisker Reduction Convection Phase-field method

Sessile droplet freezing and ice adhesion on aluminum with different surface wettability and surface temperature

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Science China(Physics,Mechanics & Astronomy) 2015年第7期58卷 67-74页

作者： ou JunFei SHI Qingwen WANG ZhiLe WANG FaJun XUE MingShan LI wen YAN GuiLong School of Materials Science and Engineering Nanchang Hangkong University Key Laboratory for Microstructural Control of Metallic Materials of Jiangxi Province Nanchang Hangkong University Jiangsu Key Laboratory for Biomass-based Energy and Enzyme Technology Huaiyin Normal University

This paper focused on the sessile droplet freezing and ice adhesion on aluminum with different wettability （hydrophilic, com- mon hydrophobic, and superhydrophobic surfaces, coded as HIS, CHS, SHS, respectively） over a surface temperature range of -9℃ to -19℃. It was found that SHS could retard the sessile droplet freezing and lower the ice adhesion probably due to the interfacial air pockets （IAPs） on water/SHS interface. However, as surface temperature decreasing, some IAPs were squeezed out and such freezing retarding and adhesion lowering effect for SHS was reduced greatly. For a surface temperature of-19℃, ice adhesion on SHS was even greater than that on CHS. To discover the reason for the squeezing out of lAPs, forces applied to the suspended water on IAPs were analyzed and it was found that the stability of IAPs was associated with surface mi- cro-structures and surface temperature. These findings might be helpful to designing of SHS with good anti-icing properties.

关键词： superhydrophobic anti-icing ice adhesion interfacial air pockets