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A microphysical investigation of different convective cells during the precipitation event with sustained high-resolution observations

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Frontiers of Earth Science 2024年第2期18卷 279-295页

作者： Ziheng HUANG Zheng ruan Debin SU State Key Laboratory of Severe Weather Chinese Academy of Meteorological SciencesBeijing 100081China college of Electronic Engineering Chengdu University of Information TechnologyChengdu 610225China Key Laboratory of Atmospheric Sounding China Meteorological AdministrationChengdu 610225China

The growth and breakup processes of raindrops within a cloud influence the rain intensity and the sizes of raindrops on the *** Doppler velocity spectrum acquired by a vertically pointing radar(VPR)contains information on atmospheric turbulence and the size classification of falling *** this study,the four types of convective cells(cc)during precipitation events with more than 700 mm of precipitation in southern china are *** characteristics of four types of ccs correspond to the isolated convection,the early stage,the mature stage,and the decline stage of organizational convection,in that *** analysis using retrieval of vertical air motion(Vair)and raindrop evolution in clouds from Doppler velocity spectra collected by c-band VPR revealed the growth and breakup of falling raindrops with dynamic *** raindrops appear in the early stages and are accompanied by ice particles,which are impacted by the falling path᾽s *** aggregation,which is primarily related to the alternation of updraft and downdraft,accounts for the mature stage᾽s high efficiency of surface *** ccs in the decline stage originate from the shallow uplift in the weak and broad downdraft under conditions of enough water *** updraft dominates the stage of isolated *** of convective cells could be more accurately represented in model evaluations.

关键词： cloud microphysics convective systems convective cell vertically pointing radar observations Doppler velocity spectrum

Flexible and Robust Functionalized Boron Nitride/Poly(p‑Phenylene Benzobisoxazole)Nanocomposite Paper with High Thermal conductivity and Outstanding Electrical Insulation

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Nano-Micro Letters 2024年第2期16卷 423-437页

作者： Lin Tang Kunpeng ruan xi Liu Yusheng Tang Yali Zhang Junwei Gu chongqing Key Laboratory of Green Synthesis and Applications College of ChemistryChongqing Normal UniversityChongqing 401331People’s Republic of China Shaanxi Key Laboratory of Macromolecular Science and Technology School of Chemistry and Chemical EngineeringNorthwestern Polytechnical UniversityXi’an 710072People’s Republic of China

With the rapid development of 5G information technology,thermal conductivity/dissipation problems of highly integrated electronic devices and electrical equipment are becoming *** this work,“high-temperature solid-phase&diazonium salt decomposition”method is carried out to prepare benzidine-functionalized boron nitride(m-BN).Subsequently,m-BN/poly(pphenylene benzobisoxazole)nanofiber(PNF)nanocomposite paper with nacremimetic layered structures is prepared via sol–gel film transformation *** obtained m-BN/PNF nanocomposite paper with 50 wt%m-BN presents excellent thermal conductivity,incredible electrical insulation,outstanding mechanical properties and thermal stability,due to the construction of extensive hydrogen bonds andπ–πinteractions between m-BN and PNF,and stable nacre-mimetic layered ***λ∥andλ_(⊥)are 9.68 and 0.84 W m^(-1)K^(-1),and the volume resistivity and breakdown strength are as high as 2.3×10^(15)Ωcm and 324.2 kV mm^(-1),***,it also presents extremely high tensile strength of 193.6 MPa and thermal decomposition temperature of 640°c,showing a broad application prospect in high-end thermal management fields such as electronic devices and electrical equipment.

关键词： Poly(p-phenylene-2,6-benzobisoxazole)nanofiber Boron nitride Thermal conductivity Electrical insulation

Rheological properties and concentration evolution of thickened tailings under the coupling effect of compression and shear

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International Journal of Minerals,Metallurgy and Materials 2024年第5期31卷 862-876页

作者： Aixiang Wu Zhenqi Wang Zhuen ruan Raimund Bürger Shaoyong Wang Yi Mo Key Laboratory of the Ministry of Education of china for High-efficient Mining and Safety of Metal Mines University of Science and Technology BeijingBeijing 100083China Shunde Innovation School University of Science and Technology BeijingFoshan 528399China cI2MA and Departamento de Ingeniería Matemática Facultad de Ciencias Físicas y MatemáticasUniversidad de ConcepciónCasilla 160-CConcepciónChile School of civil and Resource Engineering University of Science and Technology BeijingBeijing 100083China china Railway construction Tongguan Investment co. Ltd.Tongling 244000China

cemented paste backfill(cPB)is a key technology for green mining in metal mines,in which tailings thickening comprises the primary link of cPB ***,difficult flocculation and substandard concentrations of thickened tailings often *** rheological properties and concentration evolution in the thickened tailings remain ***,traditional indoor thickening experiments have yet to quantitatively characterize their rheological *** experiment of flocculation condition optimization based on the Box-Behnken design(BBD)was performed in the study,and the two response values were investigated:concentration and the mean weighted chord length(MWcL)of ***,optimal flocculation conditions were *** addition,the rheological properties and concentration evolution of different flocculant dosages and ultrafine tailing contents under shear,compression,and compression-shear coupling experimental conditions were tested and *** results show that the shear yield stress under compression and compression-shear coupling increases with the growth of compressive yield stress,while the shear yield stress increases slightly under *** order of shear yield stress from low to high under different thickening conditions is shear,compression,and compression-shear *** compression and compression-shear coupling,the concentration first rapidly increases with the growth of compressive yield stress and then slowly increases,while concentration increases slightly under *** order of concentration from low to high under different thickening conditions is shear,compression,and compression-shear ***,the evolution mechanism of the flocs and drainage channels during the thickening of the thickened tailings under different experimental conditions was revealed.

关键词： thickened tailings compression-shear coupling compressive yield stress shear yield stress concentration

Prediction of peritoneal free cancer cells in gastric cancer patients by golden-angle radial sampling dynamic contrast-enhanced magnetic resonance imaging

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Journal of Zhejiang University-Science B(Biomedicine & Biotechnology) 2024年第7期25卷 617-627页

作者： xueqing YIN xinzhong ruan Yongmeng ZHU Yongfang YIN Rui HUANG chao LIANG The First Affiliated Hospital of Ningbo University Ningbo 315000China Ningbo Medical center Lihuili Hospital Ningbo 315000China

Objectiveperitoneal free cancer cells can negatively impact disease progression and patient outcomes in gastric cancer. This study aimed to investigate the feasibility of using golden-angle radial sampling dynamic contrast-enhanced magnetic resonance imaging (GRASP DcE-MRI) to predict the presence of peritoneal free cancer cells in gastric cancer *** enrolled patients were consecutively divided into analysis and validation groups. Preoperative magnetic resonance imaging (MRI) scans and perfusion were performed in patients with gastric cancer undergoing surgery, and peritoneal lavage specimens were collected for examination. Based on the peritoneal lavage cytology (PLc) results, patients were divided into negative and positive lavage fluid groups. The data collected included clinical and MR information. A nomogram prediction model was constructed to predict the positive rate of peritoneal lavage fluid, and the validity of the model was verified based on data from the verification *** was no statistical difference between the proportion of PLc-positive cases predicted by GRASP DcE-MR and the actual PLc test. MR tumor stage, tumor thickness, and perfusion parameter Tofts-Ketty model volume transfer constant (Ktrans) were independent predictors of positive peritoneal lavage fluid. The nomogram model featured a concordance index (c-index) of 0.785 and 0.742 for the modeling and validation groups, *** DcE-MR could effectively predict peritoneal free cancer cells in gastric cancer patients. The nomogram model constructed using these predictors may help clinicians to better predict the risk of peritoneal free cancer cells being present in gastric cancer patients.

关键词： Gastric cancer Magnetic resonance Golden-angle radial sampling Nomogram model Peritoneal free cancer cells

Molecule aging induced by electron attacking

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Journal of Energy chemistry 2024年第6期93卷 519-525,I0013页

作者： Ping Song Yining Dong xue Gong Mingbo ruan Baoxin Ni xuanhao Mei Kun Jiang Weilin xu State Key Laboratory of Electroanalytical chemistry and Jilin Province Key Laboratory of Low carbon chemical Power Changchun Institute of Applied ChemistryChinese Academy of SciencesChangchun 130022JilinChina School of Applied chemistry and Engineering University of Science and Technology of Chin1Hefei 230026AnhuiChina Shanghai Key Laboratory of Molecular catalysis and Innovative Materials Collaborative Innovation Center of Chemistry for Energy MaterialsDepartment of ChemistryFudan UniversityShanghai 200438China

Here we propose a new concept of"molecule aging":with some special treatment,a molecule could be"aged"by losing some unknown tiny particles or pieces from atoms in the molecule,Such"aging"or loss of unknown tiny particles does not change apparently its molecular structure or chemical composition,but some physicochemical properties could be changed *** further confirm such"molecule aging"via a long-term electron attacking to age water(H_(2)O)*** IR spectra show no structural difference between the fresh water and the aged one,while the NMR spectra show that the electron attacking can decrease the size of water *** facts indicate that the electron attacking indeed can"affect"the structure of water molecule slightly but without damaging to its basic molecule *** exploration reveals that the hydrogen evolution reaction(HER)activity of the aged water molecule is lower than the fresh water on the same Pt/c *** density functional theory calculations indicate that the shortened O-H bond in H_(2)O indeed can present lower HER activity,so the observed size decrease of water clusters from NMR probably could be attributed to the shortening of O-H bond in water *** results indicate significantly that the molecule aging can produce materials with new functions for new possible applications.

关键词： Aging of molecules Electron attacking Full width at half maxima Hydrogen evolution reaction

Real effects of greenhouse gas disclosures

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china Journal of Accounting Research 2024年第2期17卷 31-53页

作者： Tong Lu Lijun ruan Yanyan Wang Lisheng Yu c.T.Bauer college of Business University of HoustonHoustonTX 77204USA School of Business New Jersey City UniversityJersey CityNJ 07305USA School of Management Xiamen UniversityXiamenFujian 361005China Business School Sun Yat-sen UniversityShenzhenGuangdong 518107China

This study investigates the valuation and real effects of the mandatory disclosure of greenhouse gas(GHG)emission costs from the perspective of“double materiality.”We consider a firm with a cobb-Douglas production function that combines GHG-related and non-GHG-related investments to produce short-term and long-term *** particular,the GHG-related investment entails short-term and long-term social costs of GHG emissions,including corporate costs and negative *** demonstrate how the mandatory disclosure of the long-term costs of GHG emissions affects capital market valuations and corporate investment decisions relative to a non-disclosure *** social welfare in an accounting regime hinges on three parameters:the persistence of the short-term investment return,the ratio of the productivity of GHG-related investment to that of non-GHG-related investment,and the social cost parameter for GHG *** findings suggest that disclosing the long-term costs of GHG emissions may be detrimental to social ***,the non-disclosure regime results in higher social welfare than the disclosure regime for high values of these parameters.

关键词： Greenhouse gas emissions Externality Double materiality Disclosure Real effects

Radiative leptonic decay of heavy quarkonia

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chinese Physics c 2024年第10期48卷 114-124页

作者： Junle Pei xinchou Lou Yaquan Fang Jinfei Wu Manqi ruan Institute of High Energy Physics Chinese Academy of SciencesBeijing 100049China Spallation Neutron Source Science center Dongguan 523803China University of chinese Academy of Sciences Beijing 100049China University of Texas at Dallas RichardsonTXUSA china center of Advanced Science and Technology Beijing 100190China

In this study,the properties of heavy quarkonia x are examined by treating them as bound states of Q and Q at the leading-order level within the non-relativistic quantum chromodynamics(NROcD)framework,where Q represents either a charm or bottom *** branching ratios for the radiative leptonic decays x→γl^(+)l^(-)are revisited,and the angular and energy/momentum distributions of the final state particles are analyzed in the restframe of ***,we apply Lorentz transformations from the rest frame of x to the center-of-mass frame of l^(+)l^(-)to establish the connection between the widths Г_(x→γl^(+)l^(-))and Г_(x→l^(+)l^(-)).The comparison of the connection tothose documented in literature(divided by 2π)for various x states,such as J/Ψ,Ψ(2S),Υ(1S),and Υ(2S),shows relative differences typically around or below 10%,comparable to the next-to-leading order corrections of O(α)and 0(ν^(4)).However,we observe a significant disparity in the ratio betweenГ_(Ψ(2S)→γτ^(+)τ^(-))andГ_(Ψ(2S)→τ^(+)τ^(-)),with our prediction being four times larger than those in *** outcomes derived from this study have practical *** in describing the quantum electrodynamics radiative processes and contribute to the investigation of QcD processes associated with the decays of heavy quarkonia and searches for new physies.

关键词： heavy quarkonia radiative leptonic decays branching ratios

Design of ca-type todorokite catalysts with highly active for the selective reduction of NO_(x) by NH_(3) at low temperatures

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Journal of Environmental Sciences 2024年第4期138卷 697-708页

作者： chuang chang Zidi Yan chunlei Zhang Yanshuang Zhang Miao Jiang Luna ruan Min xiao Yunbo Yu Hong He School of Rare Earths University of Science and Technology of ChinaHefei 230026China Ganjiang Innovation Academy Chinese Academy of SciencesGanzhou 341000China State Key Joint Laboratory of Environment Simulation and Pollution control Research Center for Eco-Environmental SciencesChinese Academy of SciencesBeijing 100085China

ca-type todorokite catalysts were designed and prepared by a simple redox method and applied to the selective reduction of NO_(x) by NH_(3)(NH_(3)-ScR)for the first *** with the Na-type manjiroite prepared by the same method,the todorokite catalysts with different Mn/ca ratios showed greatly improved catalytic activity for NO_(x) *** them,Mn8ca4 catalyst exhibited the best NH_(3)-ScR performance,achieving 90%NO_(x) conversion within temperature range of 70-275℃ and having a high sulphur *** to the Na-type manjiroite sample,ca-type todorokite catalysts possessed an increased size of tunnel,resulting in a larger specific surface *** increased the amounts of ca doping,the Na content in ca-type todorokite catalysts significantly decreased,providing larger amounts of Bronsted acid sites for NH_(3) adsorption to produce NH_(4)^(+).The NH_(4)^(+)species were highly active for reaction with NO+O_(2),playing a determining role in NH_(3)-ScR process at low ***,larger amounts of surface adsorbed oxygen contained over the ca-doping samples than that over Na-type manjiroite,promoting the oxidation of NO and fast ScR *** the ca-type todorokite catalysts,furthermore,nitrates produced during the flow of NO+O_(2),were more active for reaction with NH_(3) than that over Na-type manjiroite,benefiting the occurrence of NH_(3)-ScR *** study provides novel insights into the design of NH_(3)-ScR catalysts with high performance.

关键词： NO_(x) NH_(3)-ScR Mn-based oxides ca-type todorokite Bronsted acid sites

Legumain-triggered aggregable gold nanoparticles for enhanced intratumoral retention

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chinese chemical Letters 2024年第7期35卷 388-393页

作者： Zhi Li Wenpei Li Shaoping Jiang chuan Hu Yuanyu Huang Maxim Shevtsov Huile Gao Shaobo ruan Advanced Research Institute of Multidisciplinary Sciences School of Life ScienceBeijing Institute of TechnologyBeijing 100081China Key Laboratory of Drug Targeting and Drug Delivery System West China School of PharmacySichuan UniversityChengdu 610041China Institute of cytology of Russian Academy of Sciences(RAS) St.Petersburg 194064Russia

Insufficient intratumoral retention of nanomedicines remains the major challenge for broad implementation in clinical ***,we proposed a legumain-triggered aggregable gold nanoparticle(GNP)delivery platform(GNPs-A&c).GNPs-A&c could form intratumoral or intracellular aggregates in response to the overexpressed *** aggregates with size increase not only could reduce back-flow from interstitial space to peripheral bloodstream but also could restrict the cellular exocytosis,leading to enhanced intratumoral *** vitro studies demonstrated that GNPs-A&c possessed an excellent legumain responsiveness and the increased size was closely relevant with legumain *** vivo studies demonstrated GNPs-A&c possessed slower clearance rate and much higher intratumoral retention within legumain-overexpressed tumor compared to non-aggregable NPs,regardless of intravenous or intratumoral *** importantly,this delivery platform significantly improved the chemotherapeutic effect of doxorubicin(DOx)towards subcutaneous xenograft c6 *** effectiveness of this stimulus-responsive aggregable delivery system provides a thinking for designing more intelligent size-tunable nanomedicine that can substantially improve intratumoral retention.

关键词： Legumain Size-tunable Enhanced retention Stimulus-responsive Nanomedicine