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Thermal stability of the Cr-coated zirconium alloy microstructure prepared by pulsed laser deposition

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Tungsten 2024年第2期6卷 333-341页

作者： Bo Li Hui-Long Yang Reuben Holmes Li-juan Cui sho Kano Hiroaki Abe Department of Nuclear Engineering and Management The University of TokyoTokyo 113-8656Japan school of Nuclear science and Engineering Shanghai Jiao Tong UniversityShanghai 200240China Nuclear Professional school The University of TokyoIbaraki 319-1188Japan

Cr-coated zirconium alloy was prepared by pulsed laser deposition(PLD)for the application of accident-tolerant fuel cladding in light water *** microstructural characteristics of the Cr coating and its evolution with temperature were investigated using grazing incidence X-ray diff raction and in situ heating transmission electron microscopy(TEM).Results show that the microstructure of the laser-deposited Cr coatings consists mainly of fine and non-specific shaped nano-crystals in the inner layer and columnar crystals in the outer *** recrystallization of the Cr-coating layer starts at 300–400℃ to release the high strain introduced by PLD,and the grain coalescence starts at temperatures>400°*** annealing,the(110)-texture gradually intensifi es because of its high reticular density and low close-packed ***,in situ heating TEM observation shows the presence of cavities on the Cr–Zr interface,which may result from the interdiff usion and/or the transformation from amorphous to crystalline.

关键词： Accident tolerant fuel Crcoating Interface Microstructure Pulsed laser deposition

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Lung imaging characteristics in a patient infected with Elizabethkingia miricola following cerebral hemorrhage surgery: A case report

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World Journal of Clinical Cases 2024年第1期12卷 169-175页

作者： Ping-Qiang Qi Yi-Jun Zeng Wei Peng juan Kuai Department of Neurosurgery The Third Affiliated Hospital of Chengdu Medical College Pidu District People’s HospitalChengdu 611730Sichuan ProvinceChina

BACKGROUND Elizabethkingia miricola is a non-fermenting gram-negative bacterium,which was first isolated from the condensate of the Russian peace space station in *** studies on this bacterium have been carried out in the laboratory,and clinical case studies are *** date,a total of 6 clinical cases have been reported *** sUMMARY We present the first case of postoperative pulmonary infection in a patient with intracerebral hemorrhage due to Elizabethkingia *** imaging character-istics of pulmonary infection were identified and the formulation and selection of the clinical treatment plan for this patient are *** Elizabethkingia miricola infection is *** pulmonary infection occurs,computed tomography imaging may show diffuse distribution of a ground glass density shadow in both lungs,the air containing bronchial sign in local areas,thickening of bronchial vascular bundle,and pleural effusion.

关键词： Elizabethkingia miricola Cerebral hemorrhage surgery Postoperative pulmonary infection Imaging features Case report

THE sMOOTHING EFFECT IN sHARP GEVREY sPACE FOR THE sPATIALLY HOMOGENEOUs NON-CUTOFF BOLTZMANN EQUATIONs WITH A HARDPOTENTIAL

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Acta Mathematica scientia 2024年第2期44卷 455-473页

作者：刘吕桥曾娟 school of Mathematics and statistics Anhui Normal UniversityWuhu241002China school of Mathematics and statistics Wuhan UniversityWuhan430072China

In this article, we study the smoothing effect of the Cauchy problem for the spatially homogeneous non-cutoff Boltzmann equation for hard potentials. It has long been suspected that the non-cutoff Boltzmann equation enjoys similar regularity properties as to whose of the fractional heat equation. We prove that any solution with mild regularity will become smooth in Gevrey class at positive time, with a sharp Gevrey index, depending on the angular singularity. Our proof relies on the elementary L^(2) weighted estimates.

关键词： Boltzmann equation Gevrey regularity non-cutoff hard potential

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Habitat-specific changes of plant and soil microbial community composition in response to fairy ring fungus Agaricus xanthodermus on the Qinghai-Tibet Plateau

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soil Ecology Letters 2024年第3期6卷 189-197页

作者： juan Du Cong He Fuxin Wang Ning Ling shengjing Jiang state Key Laboratory of Herbage Improvement and Grassland Agro-ecosystems College of Pastoral Agriculture Science and TechnologyLanzhou UniversityLanzhou 730000China College of Ecology Lanzhou UniversityLanzhou 730000China

Fairy rings are common in diverse global biomes and often appear as lush vegetation in one to three concentric zones caused by the spread of mycelia in grassland ***,the underlying mechanisms and environmental adaptation of fairy rings remain largely *** this study,two fairy rings(A and B)caused by Agaricus xanthodermus were sampled on the Qinghai-Tibet Plateau during a time when fairy rings are most *** conducting a vegetation survey and high-throughput sequencing,the changes of plants and soil microorganisms to fairy ring fungi were *** above-ground biomass at both fairy rings was greatly increased by fairy ring fungi,but the response of dominant plant species is different at two fairy ring *** addition,bacterial and fungal communities significantly varied within distinct sampling zones across the fairy rings,and showed variable genus-specific responses at two fairy ring *** fairy ring A,soil available N:P ratio was essential in shaping the structure of plant and microbial community,while soil available N concentration was the most important predictor at fairy ring *** together,our results indicated Agaricus xanthodermus fairy rings have variable effects on alpine meadow plants and soil microbes at different *** propose that the impacts of fairy ring fungi on plants and microbes are determined by the level of soil available N concentration and available N:P *** results contribute to a better understanding of the mechanisms through which fairy rings affect the vegetation of alpine meadows.

关键词： Fairy rings alpine meadow soil microbes plant-soil relationships

Transformation power or development pressure:economic growth targets and urban carbon productivity

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Chinese Journal of Population,Resources and Environment 2024年第2期22卷 176-184页

作者： Longtao Chen Yi Zheng Xianfeng Han juan Liu school of Management and Economics Kunming University of Science and TechnologyKunming 650500China school of Foreign Languages and Literatures Chongqing Normal UniversityChongqing 401331China

Maintaining moderate economic growth targets(EGTs)is the key for local governments to effectively implement the“carbon peak and carbon neutrality”goals under the refreshed development *** panel data of 276 prefecture-level cities in China's Mainland from 2010 to 2020,and employing methods such as intermediary and threshold models,this study empirically analyzes the internal mechanism of EGT’s impact on urban carbon productivity(UCP).Our findings demonstrate that:①The overall EGT during the analyzed period is not conducive to improving *** conclusion remains valid after a series of robustness *** effect is more pronounced in the central region and resource-based cities than in the east-west region and non resource-based cities.②EGT not only directly suppresses UCP but also exerts indirect negative impacts on UCP from three aspects:delaying the digital economy(DE),constraining financial expansion(FE),and hindering green technology innovation(GTI).This negative indirect effect is similar to or even surpasses the direct effect,suggesting that the internal relationship between EGT and“dual-carbon”goals should be re-evaluated from a new compound perspective.③EGT not only has a simple linear impact on UCP but also significantly exhibits a dynamic evolution pattern in inverted“U”*** is,as EGT continuously upgrades,a nonlinear impact on UCP emerges in the form of“promoting first,suppressing later”.This indicates that surpassing the“degree”limit for EGT will be detrimental to the improvement of *** study broadens the scope of carbon productivity analysis by introducing a new perspective centered on *** insights gleaned from this research offer valuable guidance for local governments to effectively manage economic growth expectations and promote the synchronized achievement of dual-carbon objectives.

关键词： Economic growth target Urban carbon productivity Mediating effects Dynamic evolution

MEMs Huygens Clock Based on synchronized Micromechanical Resonators

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Engineering 2024年第5期36卷 124-131页

作者： Xueyong Wei Mingke Xu Qiqi Yang Liu Xu a Yonghong Qi Ziming Ren juan Ren Ronghua Huan Zhuangde Jiang state Key Laboratory for Manufacturing system Engineering Xi’an Jiaotong UniversityXi’an 710049China school of Construction Machinery Chang’an UniversityXi’an 710064China Department of Mechanics Zhejiang UniversityHangzhou 310027China

With the continuous miniaturization of electronic devices,microelectromechanical system(MEMs)oscillators that can be combined with integrated circuits have attracted increasing *** study reports a MEMs Huygens clock based on the synchronization principle,comprising two synchronized MEMs oscillators and a frequency compensation *** MEMs Huygens clock improved shorttime stability,improving the Allan deviation by a factor of 3.73 from 19.3 to 5.17 ppb at 1 s.A frequency compensation system based on the MEMs oscillator’s temperature-frequency characteristics was developed to compensate for the frequency shift of the MEMs Huygens clock by controlling the resonator *** effectively improved the long-term stability of the oscillator,with the Allan deviation improving by 1.6343105 times to 30.9 ppt at 6000 *** power consumption for compensating both oscillators simultaneously is only 2.85 mW·℃^(-1).Our comprehensive solution scheme provides a novel and precise engineering solution for achieving high-precision MEMs oscillators and extends synchronization applications in MEMs.

关键词： Frequency stability Huygens clock MEMs Oscillator synchronization

A review of recent advances of kesterite thin films based on magnesium, iron and nickel for photovoltaic application: insights into synthesis, characterization and optoelectronic properties

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CLEAN ENERGY 2024年第2期8卷 217-238页

作者： Perez, Nelson Mauricio Espinel Lopez, Enrique Vera Cuaspud, Jairo Alberto Gomez Castello, juan Bautista Carda Univ Pedag & Tecnol Colombia Grp Invest Integridad & Evaluac Mat GIEM Inst Invest & Innovac Ciencia & Tecnol Mat INCITEM Ave Cent Norte 39-115 Tunja Boyaca Colombia Ctr Minero Serv Nacl Aprendizaje Sena Vereda Morca Sect Bata Sogamoso Boyaca Colombia Univ Jaume 1 Grp Quim Inorgan & Organ Campus Riu Sec Castellon De La Plana Castellon De La Spain

This review emphasizes the recent advancements and prospects of thin-film kesterite-based photovoltaic (PV) applications using magnesium, iron and nickel. The quest for novel materials employed in solar cells has resulted in incorporating these elements into the composition of kesterite as substitutes or modifiers (dopants) for zinc. This integration has induced notable repercussions on the structural, optoelectronics and morphological properties, which are reviewed. The first section of this paper offers a comprehensive review of the general characteristics of kesterite minerals. These crucial materials exhibit a high absorption coefficient (104 cm-1) and an optical band gap of 1.0-1.8 eV. Moreover, they are free of critical raw materials, non-toxic and sustainable. The second section depicts the substitution or modification of zinc by magnesium in kesterite. Additionally, this paper provides a comprehensive review of the quaternary and pentanary systems Cu2Mgsn(s,se)4 and Cu2Zn1-xMgxsns4, highlighting their advantages and drawbacks. In the last section, a review of the quaternary or pentanary systems is conducted, namely Cu2ZnxFe1-xsns4 and Cu2ZnxNi1-xsns4, along with their effects on optoelectronic properties. In conclusion, various methods for obtaining modified or substituted kesterite materials using magnesium, iron and nickel have demonstrated sustainability, scalability for industrial production and potential candidacy as substitutes for conventional PV materials. The prospects for pentanary materials (Cu2Zn1-xMgxsns4, Cu2Zn1-xFexsns4 and Cu2Zn1-xNixsns4) are to overcome the efficiency record of kesterite reported in 2014, which was 12.6 % for Cu2Znsn(s,se)4, and to enhance its optoelectronic properties through synthesis conditions that comply with the principles of green chemistry. Recent advancements and prospects for thin-film kesterite-based materials for photovoltaic applications are reviewed in which magnesium, iron and nickel are used as substitutes o

关键词： kesterite thin film magnesium iron nickel substitutes or modifiers novel materials sustainability sOLAR-CELL TECHNOLOGIEs HYDROTHERMAL sYNTHEsIs THERMAL-DECOMPOsITION ELECTRIcal-PROPERTIEs OPTIcal-PROPERTIEs CU2ZNsNs4 CU2FEsNs4 EFFICIENCY NANOPARTICLEs FABRICATION

Validating the use of ROs-scavenging bacteria as probiotics to increase coral resilience to thermal stress

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Journal of Oceanology and Limnology 2024年第4期42卷 1242-1260页

作者： Xiaoyu TANG Qingsong YANG Ying ZHANG Hanzhang WANG juan LING Haiyan sUN Junde DONG Yanying ZHANG CAs Key Laboratory of Tropical Marine Bio-resources and Ecology South China Sea Institute of Oceanology(SCSIO)Guangzhou 510301China Ocean school Yantai UniversityYantai 264005China southern Marine science and Engineering Guangdong Laboratory(Guangzhou) Guangzhou 511458China sanya National Marine Ecosystem Research station and Key Laboratory of Tropical Marine Biotechnology of Hainan Province Sanya Institute of OceanologySCSIOSanya 572000China Institute of Deep-sea science and Engineering Chinese Academy of SciencesSanya 572000China University of Chinese Academy of sciences Beijing 100049China

Thermal stress causes the overproduction and toxic accumulation of reactive oxygen species(ROs),which seems to be correlated with coral bleaching and,ultimately,*** reduction of ROs concentration within the coral holobiont could minimize the effects of thermal stress and support efforts to reduce coral decline *** the current study,we explored the physiological responses of Pocillopora damicornis to ROs-scavenging bacteria inoculation as well as the microbiome restructuring that correlates with ***’s resilience to thermal stress after probiotic *** of corals with ROs-scavenging bacteria enhanced coral health and reduced ROs ***,the enhanced coral thermal resistance promoted by ROs-scavenging bacteria was also correlated with an overall coral microbiome *** addition,the complex network relationships between bacteria and symbiodiniaceae in corals after ROs-scavenging bacteria inoculation contributed to corals’resilience to high ***,coral heat tolerance bacterial biomarkers,such as Myxococcota,were enriched in corals with added ROs-scavenging ***,our findings validate the selected ROs-scavenging bacteria as coral probiotics that could help corals resist thermal stress on a short ***,our data contribute to our understanding of the potential interactions between different members of the coral holobiont and the use of probiotics as tools to aid coral restoration efforts.

关键词： coral beneficial microorganisms for corals(BMCs) symbiodiniaceae thermal stress coral bleaching

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Effective utilization of dolomitic lead-zinc waste rock by replacing dolomite as flux in iron ore sintering process

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Journal of Iron and steel Research International 2024年第8期31卷 1861-1872页

作者： Xin Wang Cong-cong Yang Jian Pan De-qing Zhu Zheng-qi Guo Guang-hui Xia shi-juan Qu school of Minerals Processing and Bioengineering Central South UniversityChangsha 410083HunanChina Low-Carbon and Hydrogen Metallurgy Research Center Central South UniversityChangsha 410083HunanChina

With increasingly stringent environmental protection policies,cost-effective and value-added treatment of massive lead-zinc waste rock(LZWR)generated from the preconcentration process has attracted substantial attention.A type of dolomitic LZWR with 18 wt.%MgO,27 wt.%CaO,0.29 wt.%Zn and 1.43 wt.%s was used as a replacement flux in the iron ore sintering *** sinter pot tests were carried out based on an industrial ore *** results show that replacing 0%-60%of dolomite with LZWR does not adversely affect the sintering productivity,fuel consumption rate,and the quality of the sinter products,while the Zn and s elements contained in LZWR can be effectively removed with the residual Zn and s contents of the resultant sinter products being less than 0.02 and 0.055 wt.%,***,substituting LZWR for dolomite as a flux inevitably increases the sO_(2) concentration in the sintering flue gas due to its high sulfur *** the processing capacity of the sintering flue gas desulfurization system,the replacement ratio of dolomite can reach 40%,equal to LZWR consumption of 24.3 kg per ton of *** sO_(2) in sintering flue gas can be recovered to produce(NH_(4))_(2)sO_(4) or HsO_(4),while the volatilized Zn collected into the zinc-containing dust can be subsequently recycled by the rotary hearth furnace ***,it is technologically and economically feasible to use the LZWR as a replacement flux in the iron ore sintering process,providing a new way for the safe,large-scale and low-cost treatment of LZWR.

关键词： Lead Zinc waste rock Dolomite sintering Flue gas sinter product