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Maintenance and Management Model for the Urban Stereo Landscape Forest in Chongqing Academy of Science and Technology 被引量:1
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作者 WANG Zhengchun CHEN Lina +5 位作者 JIANG Haiyan HE Bangliang ZHOU Fei JIANG Xinxing CHEN Daojing YANG Bo 《Journal of Landscape Research》 2012年第11期4-10,共7页
Based on landscaping practices in the stereo landscape demonstration project of Chongqing Academy of Science and Technology (CAST),current management and maintenance of the stereo landscapes were introduced by analyzi... Based on landscaping practices in the stereo landscape demonstration project of Chongqing Academy of Science and Technology (CAST),current management and maintenance of the stereo landscapes were introduced by analyzing maintenance and management of the plants in the stereo landscape forest.The maintenance and management models were summarized according to the management styles,concrete measures and new technologies were studied,laws and key points for the maintenance and management in different seasons were given,and finally deficiencies and solutions were proposed to improve the future maintenance and management. 展开更多
关键词 Management model STEREO LANDSCAPE CHONGQING ACADEMY of Science and Technology (CAST)
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Detection of the Oscillation Marks on Casting Slabs Using Magnetic Flux Variation and the Nonexcitation Method
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作者 FENG Kaibin LIU Runcong +3 位作者 LI Silong WU Yunfei NA Xianzhao WANG Xiaodong 《材料导报》 北大核心 2026年第1期149-158,共10页
T he residual stray magnetic fields present in ferromagnetic casting slabs were investigated in this work,which result from the magnetic fields generated during the steel casting process.Existing optical detection met... T he residual stray magnetic fields present in ferromagnetic casting slabs were investigated in this work,which result from the magnetic fields generated during the steel casting process.Existing optical detection methods face challenges owing to surface oxide scales,and conventional high-precision magnetic sensors are ineffective at high temperatures.To overcome these limitations,a small coil sensor was employed to measure the residual magnetism strength in oscillation traces,using metal magnetic memory and electromagnetic induction methods,which can carry out detection without an external excitation source.Using this technology,the proposed scheme successfully detects defects at high tempe-ratures(up to 670℃)without a cooling device.The key findings include the ability to detect both surface and near-surface defects,such as cracks and oscillation marks,with an enhanced signal-to-noise ratio(SNR)of 7.2 dB after signal processing.The method’s practicality was validated in a steel mill environment,where testing on casting slabs effectively detected defects,providing a foundation for improving industrial quality control.The proposed detection scheme offers a significant advancement in nondestructive testing(NDT)for high-temperature applications,contributing to more efficient and accurate monitoring of ferromagnetic material integrity. 展开更多
关键词 oscillation marks REMANENCE metal magnetic memory near surface defects nondestructive testing(NDT)
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Linear relationship between reactivity and the reciprocal of uranium concentration in thermal-spectrum molten salt re
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作者 Chang-Qing Yu Gui-Feng Zhu +7 位作者 Shu-Yang Jia Yang Zou Rui Yan Jian Guo Ya-Fen Liu Bo Zhou Xue-Chao Zhao Xiao-Han Yu 《Nuclear Science and Techniques》 2026年第2期208-222,共15页
Knowing the precise relationship between fuel loading and reactivity is essential for guiding reactor criticality extrapolation and online refueling in molten salt reactors(MSRs).This study aims to explore and explain... Knowing the precise relationship between fuel loading and reactivity is essential for guiding reactor criticality extrapolation and online refueling in molten salt reactors(MSRs).This study aims to explore and explain the linear relationship between reactivity and the reciprocal of uranium concentration in thermal-spectrum MSRs.By applying neutron balance theory,we analyzed the neutron absorption cross sections of various nuclides in single-lattice models with varying fuel concentrations.Our findings reveal a simple linear correlation between reactivity and the reciprocal of uranium concentration,which can be explained from the perspective of nuclear reaction cross sections that adhere to the 1/v law in the thermal neutron spectrum.Furthermore,we identified that the neutron absorption single-group cross sections of structural materials and carrier salts exhibit an approximately linear relationship with the fission single-group cross section of ^(235) U;similarly,the reciprocal of ^(235)U’s fission cross section exhibits an approximately linear relationship with uranium concentration.This linear relationship deviates as the volume fraction of molten salt increases,due to a greater proportion of neutrons being captured in the resonance energy spectrum.However,it remains valid for molten salt volume fractions up to 25%and demonstrates broad applicability in the physical design and operation of thermal molten salt reactors. 展开更多
关键词 Molten salt reactor REACTIVITY Uranium concentration Cross sections LINEAR
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Influence of interface shape on microstructure and mechanical properties of Mg/Al composite plates fabricated by hot-pressing
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作者 Shi-jun TAN Bo SONG +6 位作者 Hao-hua XU Ting-ting LIU Jia SHE Sheng-feng GUO Xian-hua CHEN Kai-hong ZHENG Fu-sheng PAN 《Transactions of Nonferrous Metals Society of China》 2026年第1期124-143,共20页
A new method was proposed for preparing AZ31/1060 composite plates with a corrugated interface,which involved cold-pressing a corrugated surface on the Al plate and then hot-pressing the assembled Mg/Al plate.The resu... A new method was proposed for preparing AZ31/1060 composite plates with a corrugated interface,which involved cold-pressing a corrugated surface on the Al plate and then hot-pressing the assembled Mg/Al plate.The results show that cold-pressing produces intense plastic deformation near the corrugated surface of the Al plate,which promotes dynamic recrystallization of the Al substrate near the interface during the subsequent hot-pressing.In addition,the initial corrugation on the surface of the Al plate also changes the local stress state near the interface during hot pressing,which has a large effect on the texture components of the substrates near the corrugated interface.The construction of the corrugated interface can greatly enhance the shear strength by 2−4 times due to the increased contact area and the strong“mechanical gearing”effect.Moreover,the mechanical properties are largely depended on the orientation relationship between corrugated direction and loading direction. 展开更多
关键词 Mg/Al composite plate interface shape MICROSTRUCTURE mechanical properties TEXTURE
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Impact hydroforming characteristics for a half-tube part with curvature
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作者 Hongliang ZHU Yong XU +5 位作者 Boris B.KHINA Wenlong XIE Shi-Hong ZHANG Liangliang XIA Mingyu GAO Artur I.POKROVSKY 《Chinese Journal of Aeronautics》 2026年第1期626-642,共17页
Taking half-tube part with curvature as an example,the Impact Hydroforming(IHF)characteristics were studied by combining the actual forming experiment and numerical simulation.The IHF experiment showed that wrinkles a... Taking half-tube part with curvature as an example,the Impact Hydroforming(IHF)characteristics were studied by combining the actual forming experiment and numerical simulation.The IHF experiment showed that wrinkles appeared at the bottom of the part during single-step forming,but no wrinkles were observed during double-step forming.The thinning rate and deviation of the wall thickness of the part in each area were less than 20%and 2.7 mm,correspondingly,and the drawing depth of the part reached 45.8 mm.The effect of double-step forming was better than that of single-step forming,which was related to the IHF forming law.Besides,the characteristics of the IHF process were studied by numerical simulation.The results indicated that when double-step forming was utilized,there was almost no velocity field in the opposite direction of deformation after the bottom of the part contacted the die,and the existence of stress state at the bottom would restrain and eliminate the wrinkles.The inertia effect evolved with the driving pressure.Specially,the inertia effect can improve the flow of metal and reduce the deviation of the wall thickness of the part under double-step forming. 展开更多
关键词 Aluminum-lithium alloy Forming characteristics Half-tube part Impact hydroforming Inertia effect
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An effective strategy to enhance the cathodic performance of low-temperature solid oxide fuel cells through Mo-doping
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作者 Juanjuan Tu Shanshan Jiang +7 位作者 Yujia Wang Weitao Hu Lingyan Cheng Jingjing Jiang Huangang Shi Beibei Xiao Chao Su Daifen Chen 《International Journal of Minerals,Metallurgy and Materials》 2026年第1期322-334,共13页
This study focused on improving the cathode performance of Ba_(0.6)Sr_(0.4)Co_(0.85)Nb_(0.15)O_(3-δ)(BSCN)-based perovskite materials through molybdenum(Mo)doping.Pure BSCN and Mo-modified-BSCN—Ea_(0.6)Sr_(0.4)Co_(0... This study focused on improving the cathode performance of Ba_(0.6)Sr_(0.4)Co_(0.85)Nb_(0.15)O_(3-δ)(BSCN)-based perovskite materials through molybdenum(Mo)doping.Pure BSCN and Mo-modified-BSCN—Ea_(0.6)Sr_(0.4)Co_(0.85)Nb_(0.1)Mo_(0.05)O_(3-δ)(B S CNM_(0.05)),Ba_(0.6)Sr_(0.4)Co_(0.85)Nb_(0.05)Mo_(0.1)O_(3-δ)(BSCNM_(0.1)),and Ba_(0.6)Sr_(0.4)Co_(0.85)Mo_(0.15)O_(3-δ)(BSCM)—with Mo doping contents of 5mol%,10mol%,and15mol%,respectively,were successfully prepared using the sol-gel method.The effects of Mo doping on the crystal structure,conductivity,thermal expansion coefficient,oxygen reduction reaction(ORR)activity,and electrochemical performance were systematically evaluated using X-ray diffraction analysis,thermally induced characterization,electrochemical impedance spectroscopy,and single-cell performance tests.The results revealed that Mo doping could improve the conductivity of the materials,suppress their thermal expansion effects,and significantly improve the electrochemical performance.Surface chemical state analysis using X-ray photoelectron spectroscopy revealed that 5mol%Mo doping could facilitate a high adsorbed oxygen concentration leading to enhanced ORR activity in the materials.Density functional theory calculations confirmed that Mo doping promoted the ORR activity in the materials.At an operating temperature of 600℃,the BSCNM_(0.05)cathode material exhibited significantly enhanced electrochemical impedance characteristics,with a reduced area specific resistance of 0.048Ω·cm~2,which was lower than that of the undoped BSCN matrix material by 32.39%.At the same operating temperature,an anode-supported single cell using a BSCNM_(0.05)cathode achieved a peak power density of 1477 mW·cm^(-2),which was 30.71%,56.30%,and 171.50%higher than those of BSCN,BSCNM_(0.1),and B SCM,respectively.The improved ORR activity and electrochemical performance of BSCNM_(0.05)indicate that it can be used as a cathode material in low-temperature solid oxide fuel cells. 展开更多
关键词 molybdenum doping cathodic performance oxygen reduction reaction low-temperature solid oxide fuel cells
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Shear-engineered flower-like spherulites enable record ionic conductivity of PEO-based electrolytes for solid-state lithium batteries
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作者 Xiaofei Wang Shuonan Wang +4 位作者 Zhangkuo Han Jiahan Zheng Yu Chen Libing Liao Hao Liu 《Chinese Chemical Letters》 2026年第2期551-558,共8页
Polyethylene oxide(PEO)-based solid polymer electrolytes(SPEs)have long faced limitations due to low ionic conductivity at ambient temperature and poor interfacial stability with lithium metal anodes.Here,we present a... Polyethylene oxide(PEO)-based solid polymer electrolytes(SPEs)have long faced limitations due to low ionic conductivity at ambient temperature and poor interfacial stability with lithium metal anodes.Here,we present a structural engineering strategy to address these challenges through shear-induced crystallization of concentrated PEO-LiTFSI solutions,which self-assemble into flower-like spherulites with radially aligned lamellar crystals.This unique structure creates continuous Li^(+)transport highways through densely packed crystalline domains,achieving a record-high ionic conductivity of 1.70×10^(-4) S/cm at 25℃ for pristine PEO-based systems.Strategic incorporation of lithium montmorillonite(MMTli,10 wt%)further optimizes the composite electrolyte,balancing high ionic conductivity(1.47×10^(-4) S/cm)with enhanced electrochemical stability(4.99 V vs.Li^(+)/Li),elevated Li^(+)transference number(0.62),and mechanical robustness.The composite electrolyte enables stable Li plating/stripping over 800 h in symmetric Li||Li cells and powers LiFePO_(4)||Li solid-state batteries with 82%capacity retention after 200 cycles at 0.2 C under ambient conditions.This work pioneers a scalable processing paradigm for crystalline polymer electrolytes,offering new insights into ion transport mechanisms and validating clay minerals as multifunctional additives for next-generation energy storage systems. 展开更多
关键词 Solid polymer electrolytes Polyethylene oxide Flower-like spherulite MONTMORILLONITE Solid-state lithium batteries
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HALIMA:a hybrid array for lifetime measurement of neutron-rich nuclei at IMP
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作者 Zi-Hao Jia Yong-De Fang +37 位作者 Si-Cheng Wang Wei Hua Hong-Yi Wu Guang-Xin Zhang Cen-Xi Yuan Zhi-Xuan Wang Jun-Hong Xu Jian-Hong Li Wen Liang Yu-Hong Tan Wen-Jun Pan Yu-Xuan Ren MKumar Raju Song Guo Guang-Shun Li Yun-Hua Qiang Min-Liang Liu Bing Ding Ming-Hui Huang Ning-Tao Zhang Bing-Shui Gao Peng Ma He-Run Yang Ruo-Fu Chen Hai-Xia Li Rong-Hua Li Xiu-Hua Wang Cui-Hong Chen Hai-Bo Yang Jian-Song Wang Xiao-Hui Sun Zhi-Huan Li Hui Hua Wei Wang Xin-Xing Xu Xiao-Hong Zhou Zai-Guo Gan Yu-Hu Zhang 《Nuclear Science and Techniques》 2026年第2期169-182,共14页
A new multi-detector array named HALIMA(Hybrid Array for LIfetime MeAsurement)has been developed at Lanzhou for nuclear structure studies in fission.The array comprises eight BGO-shielded High-Purity Germanium detecto... A new multi-detector array named HALIMA(Hybrid Array for LIfetime MeAsurement)has been developed at Lanzhou for nuclear structure studies in fission.The array comprises eight BGO-shielded High-Purity Germanium detectors and twenty fast Ce-doped Lanthanum Bromide[LaBr_(3)(Ce)]detectors shielded with CsI(Tl).HALIMA is further complemented by two ancillary detector systems:fission fragment(FF)detectors and β detectors.This configuration enables precise sub-nanosecond lifetime measurements using the fourfold FF/β-Ge-LaBr_(3)(Ce)-LaBr_(3)(Ce)coincidence technique.The performance and specifications of the detectors,associated electronics,and the data acquisition system are presented in detail.The advantage of FF selectivity is emphasized,which significantly enhances sensitivity to specific fission channels.Using this approach,the lifetimes of the nuclear excited states populated in the spontaneous fission of^(252)Cf were measured,showing good agreement with the established literature values. 展开更多
关键词 FFs/β-γrays coincidences SELECTIVITY Spontaneous fission LaBr_(3)(Ce) HPGE Solar cells Lifetime measurement
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A new horizon for neuroscience:terahertz biotechnology in brain research 被引量:2
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作者 Zhengping Pu Yu Wu +2 位作者 Zhongjie Zhu Hongwei Zhao Donghong Cui 《Neural Regeneration Research》 SCIE CAS 2025年第2期309-325,共17页
Terahertz biotechnology has been increasingly applied in various biomedical fields and has especially shown great potential for application in brain sciences.In this article,we review the development of terahertz biot... Terahertz biotechnology has been increasingly applied in various biomedical fields and has especially shown great potential for application in brain sciences.In this article,we review the development of terahertz biotechnology and its applications in the field of neuropsychiatry.Available evidence indicates promising prospects for the use of terahertz spectroscopy and terahertz imaging techniques in the diagnosis of amyloid disease,cerebrovascular disease,glioma,psychiatric disease,traumatic brain injury,and myelin deficit.In vitro and animal experiments have also demonstrated the potential therapeutic value of terahertz technology in some neuropsychiatric diseases.Although the precise underlying mechanism of the interactions between terahertz electromagnetic waves and the biosystem is not yet fully understood,the research progress in this field shows great potential for biomedical noninvasive diagnostic and therapeutic applications.However,the biosafety of terahertz radiation requires further exploration regarding its two-sided efficacy in practical applications.This review demonstrates that terahertz biotechnology has the potential to be a promising method in the field of neuropsychiatry based on its unique advantages. 展开更多
关键词 biological effect brain NEURON NEUROPSYCHIATRY NEUROSCIENCE non-thermal effect terahertz imaging terahertz radiation terahertz spectroscopy terahertz technology
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Far-Infrared and submillimeter properties of SDSS galaxies in the Herschel ATLAS science demonstration phase field
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作者 Man I Lam Hong Wu +1 位作者 Yi-Nan Zhu Zhi-Min Zhou 《Research in Astronomy and Astrophysics》 SCIE CAS CSCD 2013年第2期179-196,共18页
Using the Herschel ATLAS science demonstration phase data cross- identified with SDSS DR7 spectra, we select 297 galaxies with F250μm 〉 5σ. The sample galaxies are classified into five morphological types, and more... Using the Herschel ATLAS science demonstration phase data cross- identified with SDSS DR7 spectra, we select 297 galaxies with F250μm 〉 5σ. The sample galaxies are classified into five morphological types, and more than 40% of the galaxies are peculiar/compact galaxies. The peculiar galaxies show higher far- infrared/submillimeter luminosity-to-mass ratios than the other types. We perform and analyze the correlations of far-infrared/submillimeter and Hα luminosities for differ- ent morphological types and different spectral types. The Spearman rank coefficient decreases and the scatter increases with the wavelength increasing from 100 μm to 500 μm. We conclude that a single Herschel SPIRE band is not good for tracing star formation activities in galaxies. AGNs contribute less to the far-infrared/submillimeter luminosities and do not show a difference from star-forming galaxies. However, the earlier type galaxies present significant deviations from the best fit of star-forming galaxies. 展开更多
关键词 galaxies: formation -- galaxies statistics -- galaxies structure -- in-frared: galaxies
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The potential of FAST in detecting celestial hydroxyl masers and related science topics
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作者 Jiang-Shui Zhang Di Li +2 位作者 Jun-Zhi Wang Qing-Feng Zhu Juan Li 《Research in Astronomy and Astrophysics》 SCIE CAS CSCD 2019年第2期65-70,共6页
The Five-hundred-meter Aperture Spherical radio Telescope(FAST) will make contributions to studies of Galactic and extragalactic masers. This telescope, with construction finished and now undergoing commissioning, has... The Five-hundred-meter Aperture Spherical radio Telescope(FAST) will make contributions to studies of Galactic and extragalactic masers. This telescope, with construction finished and now undergoing commissioning, has an innovative design that leads to the highest sensitivity of any single dish radio telescope in the world. FAST's potential for OH megamaser research is discussed, including the sky density of masers detectable in surveys. The scientific impact expected from FAST maser studies is also discussed. 展开更多
关键词 MASERS instrumentation:sensitivity instrumentation:detectability SKY density galaxies:interactions
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Erratum to“3D culturing of human adipose-derived stem cells enhances their pluripotency and differentiation abilities”[Journal of Materials Science&Technology 63(2021)9-17]
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作者 Tzu-Cheng Sung Chao-Wen Heish +8 位作者 Henry Hsin-Chung Lee Jhe-Yu Hsu Chun-Ko Wang Jia-Hua Wang Yu-Ru Zhu Shih-His Jen Shih-Tien Hsu Abdurahman H.Hirad Abdullah A.Alarfaj 《Journal of Materials Science & Technology》 SCIE EI CAS CSCD 2022年第16期307-307,共1页
The affiliations of several authors were modified during the proofing stage at the request of corresponding author Akon Higuchi,without notifying the involved authors and the Editorial Office.After communication with ... The affiliations of several authors were modified during the proofing stage at the request of corresponding author Akon Higuchi,without notifying the involved authors and the Editorial Office.After communication with all authors,all parties involved agreed to publish this erratum to correct the affiliations and authors. 展开更多
关键词 PARTIES agreed REQUEST
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A Nonlinear Multi-Scale Interaction Model for Atmospheric Blocking:A Tool for Exploring the Impact of Changing Climate on Mid-to-High Latitude Weather Extremes 被引量:1
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作者 Dehai LUO Wenqi ZHANG Binhe LUO 《Advances in Atmospheric Sciences》 2025年第10期2018-2035,共18页
A nonlinear multi-scale interaction(NMI)model was proposed and developed by the first author for nearly 30 years to represent the evolution of atmospheric blocking.In this review paper,we first review the creation and... A nonlinear multi-scale interaction(NMI)model was proposed and developed by the first author for nearly 30 years to represent the evolution of atmospheric blocking.In this review paper,we first review the creation and development of the NMI model and then emphasize that the NMI model represents a new tool for identifying the basic physics of how climate change influences mid-to-high latitude weather extremes.The building of the NMI model took place over three main periods.In the 1990s,a nonlinear Schr?dinger(NLS)equation model was presented to describe atmospheric blocking as a wave packet;however,it could not depict the lifetime(10-20 days)of atmospheric blocking.In the 2000s,we proposed an NMI model of atmospheric blocking in a uniform basic flow by making a scale-separation assumption and deriving an eddyforced NLS equation.This model succeeded in describing the life cycle of atmospheric blocking.In the 2020s,the NMI model was extended to include the impact of a changing climate mainly by altering the basic zonal winds and the magnitude of the meridional background potential vorticity gradient(PVy).Model results show that when PVy is smaller,blocking has a weaker dispersion and a stronger nonlinearity,so blocking can be more persistent and have a larger zonal scale and weaker eastward movement,thus favoring stronger weather extremes.However,when PVy is much smaller and below a critical threshold under much stronger winter Arctic warming of global warming,atmospheric blocking becomes locally less persistent and shows a much stronger westward movement,which acts to inhibit local cold extremes.Such a case does not happen in summer under global warming because PVy fails to fall below the critical threshold.Thus,our theory indicates that global warming can render summer-blocking anticyclones and mid-to-high latitude heatwaves more persistent,intense,and widespread. 展开更多
关键词 nonlinear Schrödinger equation nonlinear multi-scale interaction model of atmospheric blocking meridional background potential vorticity gradient climate change mid-to-high latitude weather extremes
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Newly Identified Au-Ag-Bi-Te Mineralization in the Aydindere Skarn Fe and Cu Deposit,Giresun,NE Turkey:Implications of Gold Mineralization during Retrograde Skarn Evolution 被引量:1
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作者 Ahmet Sasmaz Vitaliy Sukach +7 位作者 Serhiy Bondarenko Hryhorii Aleksiienko Hengameh Erfanian Kaseb Bilge Sasmaz Sergiy Kurylo Oleksandr Hrinchenko Volodymyr Somka Panagiotis Voudouris 《Journal of Earth Science》 2025年第2期543-561,共19页
This study investigates the mineralogy and mineral-chemistry of a newly discovered Au-Ag-Bi-Te mineralization at the Aydindere Fe-Cu skarn deposit,within the Pontides Tectonic Unit,northeastern Turkey.The mineralizati... This study investigates the mineralogy and mineral-chemistry of a newly discovered Au-Ag-Bi-Te mineralization at the Aydindere Fe-Cu skarn deposit,within the Pontides Tectonic Unit,northeastern Turkey.The mineralization is developed in the skarn zone at the contact between Upper Cretaceous andesite-pyroclastic rocks and a Paleocene–Eocene I-type granitoid.The principal ore minerals of the Aydindere Fe-Cu deposit are oxides(magnetite),sulfides(pyrite-chalcopyritegalena-sphalerite),tellurides/sulfotellurides(tetradymite,hessite),sulfosalts(wittichenite,emplectite,aikinite) and native gold-electrum.Skarn minerals include anhydrous phases(garnet) formed in a prograde stage and hydrous phases(amphibole,epidote,chlorite),which were formed in a retrograde stage in association with quartz,adularia,apatite and late calcite.Sulfides,tellurides and sulfosalts are introduced during the retrograde stage.The Au-Ag-Bi-Te mineralization was detected for the first time within the western ore body of the Aydindere deposit,and occurs in calcite-bearing sulfide bodies that cut magnetite-garnet-amphibole-epidote skarns with magnetite ores of different grade,including massive magnetite.Chlorite geothermometry indicates formation of the Au-Ag-BiTe mineralization at temperatures between 300 and 250 ℃,during the retrograde skarn evolution.Assuming the temperature is ~275 ℃,logfS_(2) =-10.5 to-13,logfO_(2) =-37 to-33,and logf Te2 values range from approximately-12 to-8.5 were estimated.The available mineralogical and geological data(presences of magnetite,oxidized-type tellurides/sulfotellurides,and andraditic garnets,and absence of pyrrhotite and arsenopyrite) suggest that Aydindere is an oxidized Au-bearing skarn deposit.The discovery of Au-Ag-Bi-Te mineralization at Aydindere increases its productivity and requires more detailed exploration in the deposit for precious(Au,Ag) and critical(Bi,Te) metals. 展开更多
关键词 aydindere Black Sea Region telluredes oxidized gold-bearing skarn deposit mineral geology
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Roles of extracellular polymeric substances in arsenic accumulation and detoxification by cell wall intact and mutant strains of Chlamydomonas reinhardtii 被引量:1
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作者 Sadiq Naveed Qingnan Yu +3 位作者 Katarzyna Szewczuk-Karpisz Chunhua Zhang Shafeeq-Ur Rahman Ying Ge 《Journal of Environmental Sciences》 2025年第6期142-154,共13页
Arsenic(As)pollution seriously threatens human and ecological health.Microalgal cell wall and extracellular polymeric substances(EPS)are known to interactwith As,but their roles in the As resistance,accumulation and s... Arsenic(As)pollution seriously threatens human and ecological health.Microalgal cell wall and extracellular polymeric substances(EPS)are known to interactwith As,but their roles in the As resistance,accumulation and speciation inmicroalgae remain unclear.Here,we used two strains of Chlamydomonas reinhardtii,namely CC-125(wild type)and CC-503(cell walldeficientmutant),to examine the algal growth,EPS synthesis,As adsorption,absorption and transformation under 10–1000μg/L As(III)and As(V)treatments for 96 h.In both strains,the As absorption increased after the EPS removal,but the growth,As adsorption,and transformation of C.reinhardtii declined.The CC-125 strain was more tolerant to As stress and more efficient in EPS production,As accumulation,and redox transformation than CC-503,irrespective of EPS presence or absence.Three-dimension excitation-emission matrix(3DEEM)and attenuated total reflectance infrared spectroscopy(ATR-IR)analyses showed that As was bound with functional groups in the EPS and cell wall,such as-COOH,NH and-OH in proteins,polysaccharides and amino acids.Together,this study demonstrated that EPS and cell wall acted as barriers to lower the As uptake by C.reinhardtii.However,the cell wall mutant strain wasmore susceptible to As toxicity due to lower EPS induction and higher As absorption. 展开更多
关键词 Extracellular polymeric substances Cell wall ARSENIC ACCUMULATION Speciation MICROALGAE
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Heterogeneous Interface Engineering of CoMoP/C3N4/ N‐Doped Carbon to Boost Overall Water Splitting 被引量:1
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作者 Bo Ma Tao Bo +1 位作者 Sihao Deng Chunyong He 《Carbon Energy》 2025年第11期172-186,共15页
The design of efficient and cost‐effective bifunctional catalysts, which are capable of driving both the hydrogen evolution reaction (HER) and oxygen evolution reaction (OER), is of paramount importance for advancing... The design of efficient and cost‐effective bifunctional catalysts, which are capable of driving both the hydrogen evolution reaction (HER) and oxygen evolution reaction (OER), is of paramount importance for advancing overall water splitting. Here, we developed an innovative heterogeneous interface engineering strategy to boost the electrocatalytic performance of overall water splitting. This approach involves the synergistic integration of ultra‐fine CoMoP nanocrystals coupled with three‐ dimensional (3D) porous C3N4/N‐doped carbon (NC) architectures, constructing a distinctive CoMoP/C3N4/NC heterogeneous interface. The CoMoP/C3N4/NC exhibits distinguished overall water splitting performance. To drive the overall water splitting current of 10 mA cm−2, the CoMoP/C3N4/NC||CoMoP/C3N4/NC electrolysis cell only needs an ultralow cell voltage of 1.496 V. The electronic properties and localized coordination environments characterizations, and density functional theory (DFT) calculations elucidate that the improved catalytic activities of CoMoP/C3N4/NC are primarily attributed to the synergistic interfacial coupling between CoMoP/C3N4/NC heterogeneous interface. A novel multi‐site synergistic catalytic mechanism was revealed by the DFT calculations, in which the optimum H* adsorption site on CoMoP/C3N4/NC for HER is on the cobalt atoms in CoMoP with the ultralow Gibbs free energy of hydrogen bonding (ΔGH*) of 0.018 eV, while for the OER, the optimum intermediates adsorption site of the CoMoP/C3N4/NC is on the carbon atoms in C3N4/NC. Besides, the intricately engineered 3D hierarchical porous framework of the CoMoP/C3N4/NC can facilitate the ion and electron transport and improve mass transfer, which gives rise to enhanced water splitting performance. 展开更多
关键词 bifunctional catalyst bimetallic phosphide heterogeneous interface engineering hydrogen evolution reaction overall water splitting oxygen evolution reaction
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Modeling the sensitivity of capacitive pressure sensors with microstructured wavy surfaces 被引量:1
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作者 Han Peng Nian Zhang +1 位作者 Hengxu Song Liu Wang 《Acta Mechanica Sinica》 2025年第5期104-116,共13页
In recent decades,capacitive pressure sensors(CPSs)with high sensitivity have demonstrated significant potential in applications such as medical monitoring,artificial intelligence,and soft robotics.Efforts to enhance ... In recent decades,capacitive pressure sensors(CPSs)with high sensitivity have demonstrated significant potential in applications such as medical monitoring,artificial intelligence,and soft robotics.Efforts to enhance this sensitivity have predominantly focused on material design and structural optimization,with surface microstructures such as wrinkles,pyramids,and micro-pillars proving effective.Although finite element modeling(FEM)has guided enhancements in CPS sensitivity across various surface designs,a theoretical understanding of sensitivity improvements remains underexplored.This paper employs sinusoidal wavy surfaces as a representative model to analytically elucidate the underlying mechanisms of sensitivity enhancement through contact mechanics.These theoretical insights are corroborated by FEM and experimental validations.Our findings underscore that optimizing material properties,such as Young’s modulus and relative permittivity,alongside adjustments in surface roughness and substrate thickness,can significantly elevate the sensitivity.The optimal performance is achieved when the amplitude-to-wavelength ratio(H/)is about 0.2.These results offer critical insights for designing ultrasensitive CPS devices,paving the way for advancements in sensor technology. 展开更多
关键词 Capacitive pressure sensor Sensitivity Micro-structured wavy surface
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Human agricultural activities influence the flowering time of turnip in the Qinghai-Tibet Plateau 被引量:1
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作者 Yan Zheng Landi Luo +5 位作者 Xieshengyang Li Qian Chen Ya Yang Yuanwen Duan Xiangxiang Kong Yongping Yang 《Plant Diversity》 2025年第6期899-907,共9页
Tibetan turnip and oilseeds are the most important vegetables cultivated in the Qinghai-Tibet Plateau.Our field observations identified a dominant early-bolting phenotype at the vegetative growth stage in the Tibetan ... Tibetan turnip and oilseeds are the most important vegetables cultivated in the Qinghai-Tibet Plateau.Our field observations identified a dominant early-bolting phenotype at the vegetative growth stage in the Tibetan turnip,which was possibly due to cross-pollination contamination from nearby oilseeds.We performed genetic and molecular experiments to explore the main reason for early bolting.We first analyzed gene expression and genomic sequence variation of turnip and oilseed BraFLC2,a gene that acts as a key repressor of flowering in turnip in a dosage-dependent manner.We found that the differences in flowering time and life habits between turnip and oilseeds were closely correlated with the genetic variations in BraFLC2.We further identified that the early-bolting turnip was the hybrid between turnip and oilseeds by selecting BraFLC2 as a testing gene.Furthermore,using an artificial hybridization experiment,we found that the heterozygote and low levels of BraFLC2 expression promoted early bolting in hybrid plants.These findings indicate that early-bolting in turnip is caused by cross-pollination contamination from oilseeds under human agricultural activities.We propose a strategy of strict seed screening,cultivation isolation and turnip breeding to ensure high quality and yield. 展开更多
关键词 TURNIP Qinghai-Tibet Plateau BraFLC2 variation Flowering time CROSS-POLLINATION
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Plasma-assisted fabrication of multiscale materials for electrochemical energy conversion and storage 被引量:1
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作者 Chen Li Tengfei Zhang +8 位作者 Zhong Qiu Beirong Ye Xinqi Liang Xin Liu Minghua Chen Xinhui Xia Chen Wang Wangjun Wan Yongqi Zhang 《Carbon Energy》 2025年第2期144-171,共28页
Plasma,the fourth state of matter,is characterized by the presence of charged particles,including ions and electrons.It has been shown to induce unique physical and chemical reactions.Recently,there have been increase... Plasma,the fourth state of matter,is characterized by the presence of charged particles,including ions and electrons.It has been shown to induce unique physical and chemical reactions.Recently,there have been increased applications of plasma technology in the field of multiscale functional materials'preparation,with a number of interesting results.This review will begin by introducing the basic knowledge of plasma,including the definition,typical parameters,and classification of plasma setups.Following this,we will provide a comprehensive review and summary of the applications(phase conversion,doping,deposition,etching,exfoliation,and surface treatment)of plasma in common energy conversion and storage systems,such as electrocatalytic conversion of small molecules,batteries,fuel cells,and supercapacitors.This article summarizes the structure-performance relationships of electrochemical energy conversion and storage materials(ECSMs)that have been prepared or modified by plasma.It also provides an overview of the challenges and perspectives of plasma technology,which could lead to a new approach for designing and modifying electrode materials in ECSMs. 展开更多
关键词 ELECTROCATALYSTS energy conversion and storage NANOMATERIALS plasma
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Immunoregulatory Role of In vitro-induced Regulatory T Cells in The Treatment of Ischemic Stroke
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作者 MA Yin-Zhong 《生物化学与生物物理进展》 北大核心 2025年第4期803-803,共1页
Kang et al.published a research article on the treatment of ischemic stroke using engineered Treg cells(Kang et al.,Prog Biochem Biophys,2025,52(4):946-956.DOI:10.16476/j.pibb.2025.0019).Their study mainly explores th... Kang et al.published a research article on the treatment of ischemic stroke using engineered Treg cells(Kang et al.,Prog Biochem Biophys,2025,52(4):946-956.DOI:10.16476/j.pibb.2025.0019).Their study mainly explores the immunoregulatory role of regulatory T(Treg)cells in ischemic stroke,providing an innovative therapeutic strategy.Neuroinflammation is a major driver of secondary injury after stroke.Existing treatments focus on vascular recanalization while neglecting immune regulation.Their study proposes to modulate neuroinflammation through in vitro-induced Treg cells,offering a novel approach distinct from traditional thrombolysis and endovascular interventions. 展开更多
关键词 therapeutic strategyneuroinflammation NEUROINFLAMMATION immune regulationtheir regulatory T cells treatment ischemic stroke engineered treg cells kang vascular recanalization ischemic stroke
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