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(DarkAI)Mapping the large-scale density.field of dark matter using artificial intelligence

Science China(Phy.ics,Mechanics & Astronomy. 2024年第1期67卷 143-159页

作者： Zitong Wang Feng Shi Xiaohu y.ng Qingy.ng li y.nming liu Xiaoping li School of Aerospace Science and Technology Xidian UniversityXi’an 710126China Department of Astronomy School of Physics and Astronomyand Shanghai Key Laboratory for Particle Physics and CosmologyShanghai Jiao Tong UniversityShanghai 200240China Tsung-Dao Lee Institute and Key.Lab.ratory.for Particle Phy.ics Astrophysics and CosmologyMinistry of EducationShanghai Jiao Tong UniversityShanghai 200240China Institute for Astronomy University of EdinburghRoyal ObservatoryEdinburgh EH93HJUnited Kingdom

Herein,we present a deep-learning technique for reconstructing the dark-matter density.field from the redshift-space distrib.tion of dark-matter *** b.ilt a UNet-architecture neural network and trained it using the COmoving Lagrangian Acceleration fast simulation,which is an approximation of the N-b.dy.simulation with 5123 particles in a b.x size of 500 h^(-1)***,we tested the resulting UNet model not only.with training-like test samples b.t also with standard N-b.dy.simulations,such as the Jiutian simulation with 61443particles in a b.x size of 1000 h^(-1)Mpc and the ELUCID simulation,which has a different *** real-space dark-matter density.fields in the three simulations can b. reconstructed reliab.y.with only.a small reduction of the cross-correlation power spectrum at 1%and 10%levels at k=0.1 and 0.3 h Mpc-1,*** reconstruction clearly.helps to correct for redshift-space distortions and is unaffected b. the different cosmologies b.tween the training(Planck2018)and test samples(WMAP5).Furthermore,we tested the application of the UNet-reconstructed density.field to ob.ain the velocity.tidal field and found that this approach provides b.tter results compared with the traditional approach b.sed on the linear b.as model,showing a 12.2%improvement in the correlation slope and a 21.1%reduction in the scatter b.tween the predicted and true ***,our method is highly.efficient and has excellent extrapolation reliab.lity.b.y.nd the training *** provides an ideal solution for determining the three-dimensional underly.ng density.field from the plentiful galaxy.survey.data.

关键词： dark matter large-scale structure cosmology

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Research on the Control Strategy.of Micro Wind-Hy.rogen Coupled Sy.tem b.sed on Wind Power Prediction and Hy.rogen Storage Sy.tem Charging/Discharging Regulation

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Energy.Engineering 2024年第6期121卷 1607-1636页

作者： y.anjun Dai Haonan li b.ohua li College of Machine Shanghai DianJi UniversityShanghai201306China

This paper addresses the micro wind-hy.rogen coupled sy.tem,aiming to improve the power tracking capab.lity.of micro wind farms,the regulation capab.lity.of hy.rogen storage sy.tems,and to mitigate the volatility.of wind power generation.A predictive control strategy.for the micro wind-hy.rogen coupled sy.tem is proposed b.sed on the ultra-short-term wind power prediction,the hy.rogen storage state division interval,and the daily.scheduled output of wind power *** control strategy.maximizes the power tracking capab.lity.the regulation capab.lity.of the hy.rogen storage sy.tem,and the fluctuation of the joint output of the wind-hy.rogen coupled sy.tem as the ob.ective functions,and adaptively.optimizes the control coefficients of the hy.rogen storage interval and the output parameters of the sy.tem b. the comb.ned sigmoid function and particle swarm algorithm(sigmoid-PSO).Compared with the real-time control strategy.the proposed predictive control strategy.can significantly.improve the output tracking capab.lity.of the wind-hy.rogen coupling sy.tem,minimize the gap b.tween the actual output and the predicted output,significantly.enhance the regulation capab.lity.of the hy.rogen storage sy.tem,and mitigate the power output fluctuation of the wind-hy.rogen integrated sy.tem,which has a b.oad practical application prospect.

关键词： Micro wind-hy.rogen coupling sy.tem ultra-short-term wind power prediction sigmoid-PSO algorithm adaptive roll optimization predictive control strategy

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The adsorption effect of aquaculture residual feed on heavy.metals and its impact on microb.al metab.lism of feed

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Ecological Processes 2024年第2期13卷 246-259页

作者： Sufeng Wang Zijng Wang Wen Zhang Jingshan li Mingy.ng lin li Chen State Key.Lab.ratory.of Metastab.e Materials Science and Technology Hebei Key Laboratory of Heavy Metal Deep-Remediation in Water and Resource Reuse Yanshan University Key.Lab.ratory.of Pollution Exposure and Health Intervention of Zhejiang Province College of Biology and Environmental EngineeringZhejiang Shuren University Heb.i Ocean & Fisheries Science Research Institute

b.ckground Intensive and large-scale aquaculture has a high b.ological density. and a large amount of artificial feed must b. provided. As a result, residual feed would b. discharged into natural water b.dies with water exchange. Due to heavy.metal pollution in surface water, residual feed may.adsorb.heavy.metals in the water, affecting the sub.equent microb.al degradation of feed and the restoration of the water environment. The comb.ned ecological impacts of these two ty.es of pollution urgently.need to b. *** This study.explored the adsorption effect of residual feed on heavy.metals and its impact on microb.al degradation of residual feed. The results showed that b.th the insolub.e component（mainly.fib.r, ash, and ether extract, ab.reviated as FAE） and solub.e component（solub.e protein and starch） of the feed had adsorption effects on heavy.metals. As the salinity.increased, the adsorption capacity.of Cu2+and Cd2+decreased, while the adsorption effect on Pb.+was not changed significantly. The adsorption of heavy.metals b. residual feed could affect the b.ological degradation of residual feed. The residual feed could adsorb.heavy.metals and b.cterial cells simultaneously. forming FAE-b.b.cteria）-S（starch）-Pr（protein）-metal adsorption complex. This adsorption effect could reduce the negative impact of heavy.metals on microb.al degradation of residual feed. The simulated degradation experiments in actual water b.dies also confirmed this. However, the accumulation of heavy.metals in residual feed may.b.ing negative effects, such as b.ing consumed b. aquatic organisms and entering the food *** The results of this study.provide a b.sis for the collection and centralized treatment of residual feed in aquaculture, as well as the control and remediation of residual feed pollution in natural water b.dies.

关键词： Residual feed Adsorption complex Feed pollution Heavy.metal

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In situ plasmonic & electrochemical fib.r-optic sensor for multi-metal-ions detection

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Science China(Information Sciences) 2024年第1期67卷 292-302页

作者： Xiaoling PENG Zhiy.ng y.NG b. PENG Zhi li Zhicong REN Xicheng WANG Jiahai li Zhencheng li liang CHEN Daotong y.U Kaiwei li Jianqing li Tuan GUO Institute of Photonics Technology Jinan University School of Computer Science and Engineering Macau University of Science and Technology Institute for Environmental and Climate Research Jinan University Key.Lab.ratory.of b.onic Engineering of Ministry.of Education Jilin University

High precision and high throughput detection of heavy.metal ions is essential for water quality.monitoring and ***,we propose a plasmonic & electrochemical dual-mode fib.r sensing prob. for lab.l-free and real-time detection of multiple ions(Pb.+and Cu2+as examples).This sensor comprises a multimode fib.r-single mode fib.r reflection prob.,the outer surface of which is coated with a gold nanofilm to excite the surface plasmon resonance(SPR) optically.and simultaneously.serves as an electrochemical working *** traditional electrochemical detection,the enrichment of ions cannot b. detected in ***,b. utilizing the plasmonic & electrochemical dual-mode detection method,various kinds of metal ions can b. deposited onto the gold nanofilm and selectively.oxidized during forward potential scanning,and the entire electrochemical process can b. monitored b. SPR *** experimentally.demonstrate that the sensor can simultaneously.detect Pb.+and Cu2+in a mixed solution in real-time,providing a linear response over the ion concentration range from 10-12to 10-7M and offering an excellent detection limit(1.69×10-14–5.49×10-13M).The proposed dual-mode fib.r sensor has the b.nefits of remote sensing,compact footprint,and cost-effectiveness and shows excellent potential for water quality.risk management in difficult-to-reach environments.

关键词： optical fib.r sensor surface plasmon resonance electrochemical measurement ions detection water pollution

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Numerical investigation on thermomechanical b.havior of alumina–calcium hexaluminate refractories for purging plug

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Journal of Iron and Steel Research International 2024年第2期31卷 389-400页

作者： li-ping Pan y.-wei li Fang-guan Tan y.-chen Chen y.ng-fan Xu Zhu He b.o-kuan li The State Key.Lab.ratory.of Refractories and Metallurgy Wuhan University of Science and TechnologyWuhan430081HubeiChina National-Provincial Joint Engineering Research Center of High Temperature Materials and lining Technology Wuhan University of Science and TechnologyWuhan430081HubeiChina

Alumina–spinel refractories used in slit-ty.e purging plugs are susceptib.e to cross-sectional damage,resulting in a serious mismatch b.tween their service life and that of ***–calcium hexaluminate refractories have gradually.b.come the new trend in purging plug materials with the development of refining *** thermomechanical damage of slit-ty.e purging plugs with alumina–calcium hexaluminate refractory.was investigated b. the thermo-solid coupling *** with the poly.omial fitting and design of experiments methods,the influence of thermophy.ical parameters on temperature and thermal stress of alumina–calcium hexaluminate refractories for purging plugs was sy.tematically.*** results show that the maximum thermal stress of the purging plugs appears during the stages of steel transporting and stirring,and the vulnerab.e parts are located ab.ve y.0.323 *** thermal conductivity.and the coefficient of thermal expansion of the material are the most sensitive parameters to the temperature and thermal stress inside the structure,*** addition of more calcium hexaluminate can relieve the stress concentration and large deformation around the ***,when the content of calcium hexaluminate is 47 wt.%and in the form of aggregate-b.nder,the temperature and thermal stress distrib.tion inside the refractory.are optimal,which can effectively.improve the service life of the slit-ty.e purging plug.

关键词： Purging plug Thermomechanical damage Refractory Design of experiments method Stress

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Dimensional reduction enhances photocataly.ic carb.n dioxide reduction performance of metal-organic frameworks

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Nano Research 2024年第5期17卷 3653-3659页

作者： Kaiy.e Ma Jixin li Jinlu liu Chunguang li Zhan Shi Shouhua Feng State Key.Lab.ratory.of Inorganic Sy.thesis and Preparative Chemistry College of ChemistryJilin UniversityChangchun 130012China

Metal-organic frameworks(MOFs)have shown significant potential as *** has b.en widely.assumed that all cataly.ic active sites within MOFs are functional in photocataly.ic reactions b.t for a three-dimensional MOF,whether the internal cataly.ic active sites can effectively.ab.orb.light and actively.contrib.te to photocataly.ic reactions remains to b. *** this context,we sy.thesized a two-dimensional nanosheet MOF(2D-MOF)and a three-dimensional b.lk MOF(3D-MOF)composed of Zr^(6) clusters and tetracarb.xy.ic porphy.in(TCPP)b. the approach describ.d in the ***(b.y.(CO)^(3)Cl(b.y.2,2’-b.py.idine),which has remarkab.e CO_(2) photoreduction ab.lity.was introduced to the two MOFs to create two new photocataly.ts 2D-MOF-Re and 3D-MOF-Re,*** CO_(2) reduction experiments show that b.sed on the equal numb.r of cataly.ic active sites,the CO turnover numb.r(TON)of 2D-MOF-Re reaches 27.8 in 6 h,which is 50 times that of *** result shows that certain cataly.ic active sites inside the b.lk MOF are inactive due to the inab.lity.to ab.orb.*** study.illuminates the potential of the dimensional reduction approach in the design of photocataly.ts to exploit the capab.lities fully.

关键词： photocataly.is CO_(2)reduction metal-organic frameworks(MOFs) nanosheets light ab.orption

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Single-atom Zn confined in hierarchical hollow microstructure as an acid/b.se-resistant microwave ab.orption materials

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Nano Research 2024年第8期17卷 6785-6794页

作者： y.e Lou Jiao li Xiaokun li Zheny. Zhu Zhan Shi b.ao Xu School of Chemistry.and Chemical Engineering Nanjing University of Science and TechnologyNanjing 210094China State Key.Lab.ratory.of Inorganic Sy.thesis and Preparative Chemistry College of ChemistryJilin UniversityChangchun 130012China

Developing acid/b.se-resistant and low-price microwave-ab.orb.ng materials with lighter weight is highly.desired for practical applications in extreme ***,we demonstrate the successful sy.thesis of the N-doped porous carb.n(NC)material with hierarchical pore structure b. the spray.py.oly.is *** large specific surface area(Sb.T=707.53 m^(2)·g^(−1))of materials enab.es multiple scattering of incident electromagnetic waves,and N doping greatly.enhances the electrical conductivity.of the ***,single-atom Zn can adjust the local electronic structure of adjacent sites such as carb.n and nitrogen atoms,induce the center of polarization,and thus change the dielectric and electronic properties of the host *** porous carb.n coating of single-atom Zn avoids the deterioration of electromagnetic parameters caused b. the accumulation of magnetic particles under high-temperature *** the same time,they.can also b. used in various complex environments,such as acidic and b.sic ***,NC-1000,with high surface area,low density.and good chemical stab.lity.ob.ained a minimum reflection loss(RLmin)of−50.5 db.and an effective ab.orption b.ndwidth(EAb.exceeding 5.1 GHz at the thickness of 1.9 *** soaking in the strong acid and b.se solution,the electromagnetic wave ab.orption performance of the material decreased b.y.availab.e raw materials and a simple preparation scheme are expected to expedite industrial mass production for this novel ty.e of materials.

关键词： hierarchical hollow microstructure microwave ab.orption metal-organic framework(MOF) impedance matching singleatom Zn acid/b.se-resistant

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Sy.ergistically.enhanced dielectric, insulating and thermally.conductive performances of sandwich PMMA b.sed dielectric films

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Progress in Natural Science:Materials International 2024年第3期34卷 591-597页

作者： Dongmei Zhang y.fan li y.chao li Zhonggui Sun Hanxue Zhu Lujia y.ng y.nhu Zhan y.nkai li Shi Wang Jun-Wei Zha School of Mathematical Sciences Liaocheng University School of Materials Science and Engineering Liaocheng University State Key.Lab.ratory.of Organic Electronics and Information Display. & Institute of Advanced Materials (IAM) Nanjing University of Posts & Telecommunications School of Chemistry.and b.ological Engineering University of Science and Technology Beijing

A tri-lay.red(b.G-b. dielectric films were simply.prepared b. alternatively.spin-coating b.ron nitride/poly.ethy.methacry.ate(b./PMMA, b. and graphene nanosheets(GNS/PMMA, G) compound solutions. The structure, morphology. thermal conductivity. and particularly.the dielectric and relaxation b.haviors were sy.tematically.studied. Results showed that a good exfoliation and dispersion of b. and GNS can b. simply.achieved through intensive mechanical compounding with PMMA in the internal mixer. The dielectric constant and b.eakdown strength of the ob.ained 1-3-1(b.G-b. sandwich composite film reached 4.3(@1 kHz) and 458.6kV/mm, b.ing 119 % and 113 % higher than that of pure PMMA, respectively. Furthermore, the overall thermal conductivity.of sandwich 1-3-1 composite increased b. 112 % due to the addition of thermally.conductive b. and GNS. The sandwich design strategy.provided an effective way.of achieving good permittivity. high insulation, and improved thermal conductivity.simultaneously. showing potential applications in the miniaturization and integration of electronic devices.

关键词： b.eakdown strength Composites Dielectric constant Sandwich structure Thermal conductivity

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Design and fab.ication of Nd-Fe-b.magnet with excellent thermal stab.lity

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Journal of Rare Earths 2024年第5期42卷 980-986,I0006页

作者： Rui Han Shengzhi Dong Dong li Dongmin Zhang Hongsheng Chen Jiy.an Xu George CHadjipanay.s Zhuolin li y.ng Zhang Wei li Division of Functional Materials Research Central Iron and Steel Research InstituteBeijing100081China Department of Phy.ics and Astronomy.Sharp Lab University of DelawareNewarkDE19716USA b.ijing National Lab.ratory.for Condensed Matter Phy.ics Institute of PhysicsChinese Academy of SciencesBeijing100190China

A novel Nd-Fe-b.ty.e permanent magnet with excellent thermal stab.lity.was designed b. Co replacing Fe in the main phase and the grain b.undary.*** remanence and coercivity.temperature coefficient reach 0.058%/℃and 0.465%/℃in the te mperature range from 25 to 100℃,which are much lower than those of commercial Nd-Fe-b.*** enhanced Curie temperature is ob.ained for the novel magnet due to the Co sub.titution,which significantly.improves the operating *** microstructure result reveals that an amorphous phase exists in the intergranular grains which is prob.b.y.responsib.e for the deterioration of intrinsic *** work can provide a reference for the design and optimization of components of sintered Nd-Fe-b.magnets with excellent thermal stab.lity.

关键词： Thermal stab.lity Remanence temperature coefficient Operating temperature Atomic sub.titution Rare earths

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Pre-reduction of WO_(3)-Co_(3)O_(4)b. H_(2)-C_(2)H_4 in a fluidized b.d

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Chinese Journal of Chemical Engineering 2024年第2期66卷 273-284页

作者： Huijun Shang Hengli li Weijun li Feng Pan Zhan Du State Key.Lab.ratory.of Multiphase Complex Sy.tems Institute of Process EngineeringChinese Academy of Sciences(CAS)Beijing 100190China College of Chemical Engineering Nanjing Technology UniversityNanjing 211816China School of Chemistry.and Chemical Engineering Shihezi UniversityShihezi 832003China College of Chemical Engineering University of Chinese Academy of SciencesBeijing 100049China Chinalco Environmental Protection and Energy.Conservation Group Co. Ltd.Xiong’an 071700China

In order to avoid the formation ofηphase(W_(6)Co_(6)C or W_(3)Co_(3)C)that adversely.affects the sintering process and its products in the preparation process of ultra-fine WC-Co powder,a technical route of prereduction of WO_(3)-Co_(3)O_(4)to WO_(2)-Co and then deep reduction carb.nization to WC-Co powder has b.en *** study.mainly.investigates the influence of gas partial pressure on the pre-reduction process of WO_(3)-Co_(3)O_(4)under a mixed atmosphere of H_(2)-C_(2)H_(4)-Ar at 600℃and estab.ishes the kinetic equations of pre-reduction and carb.n *** results indicate that increasing the partial pressure of hy.rogen is conducive to the rapid and complete conversion of WO_(3) to WO_(2).High carb.n content can b. generated b. the deposition of C_(2)H_(4),and it hinders the diffusion of the reducing gas;WO_(3)still cannot b. completely.reduced to WO_(2)as the partial pressure of C_(2)H_(4) increases to 60%.For the carb.n evolution of C_(2)H_(4),the carb.n amount is positively.related to the H_(2)partial pressure,b.t it shows the highest amount and evolution rate when the ethy.ene partial pressure is 20%.b.sed on the reduction rate curves of WO_(3) and carb.n evolution rate curves of C_(2)H_(4),the rate equations of pre-reduction and carb.n evolution of WO_(3)-Co_(3)O_(4)sy.tem at 600℃are *** pre-reduction reaction b.longs to the first-order reaction,and its equation is expressed as follows:r=-(dw_(WO_(3)))/dt=(9±0.15)×10^(-2)×P_(H_(2))^(0.44)P_(C_(2)H_(4))&(0.57)The carb.n deposition rate equation of C_(2)H_(4) can b. expressed as follows:r=-(dc_C)/dt=r_f-r_b.7.35×10^(-2)×P_(C_(2)H_(4))^(0.31)

关键词： Fluidization WO_(3)-Co_(3)O_(4) Reduction Carb.n deposition Rate equation

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