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Engineering N3c vacancies in hierarchical porous carbon nitride nanosheets for room temperature ultradeep photocatalytic aerobic oxidative desulfurization

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Science china chemistry 2025年

作者： Yina Nie Weijie Yang Xin Wang Xiang Li Lele Wei Xiaolin Bai Lin Liu feng fu Jun Wan college of chemistry & chemical Engineering Research Institute of Comprehensive Energy Industrial Technology Shaanxi Key Laboratory of Chemical Reaction Engineering Yan'an University Anhui Engineering Research center of carbon Neutrality College of Chemistry and Materials Science Anhui Normal University

The production of ultra-low sulfur clean fuels holds global significance for improving energy efficiency and reducing environmental pollution. Photocatalytic aerobic oxidative desulfurization（POdS） offers an attractive approach to efficiently remove refractory heterocyclic aromatic sulfur compounds under mild conditions. However, the sluggish charge dynamics,insufficient molecule activation, and slow mass transfer within photocatalysts restrict the overall desulfurization efficiency,hindering the widespread application of this technology. Herein, we developed a defective g-c3N4（m1U3cN） photocatalyst with bridged N3cvacancies and hierarchical porous structures to address these limitations. This catalyst not only demonstrates outstanding dibenzothiophene（dBT） removal efficiency of 99.6% for model oil with high conversion and selectivity but also achieves complete sulfur removal from gasoline as well as 96.7% sulfur removal for distilled diesel at room temperature,successfully achieving ultradeep aerobic oxidative desulfurization. The introduction of rich N3cvacancies and abundant micromeso-macroporous distribution in m1U3cN enhances kinetic efficiencies by promoting charge carrier separation, mass transfer,and molecular activation simultaneously; resulting in exceptional POdS performance. This work provides a collaborative strategy to overcome kinetic challenges in aerobic oxidative desulfurization via defect and structural engineering of the catalyst.

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correlation between test temperature, applied load and wear transition of mg97Zn1Y2 alloy

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Journal of magnesium and Alloys 2021年第2期9卷 592-603页

作者： J.An Y.X.Tian c.q.feng Key Laboratory of Automobile materials Ministry of EducationDepartment of Materials Science and EngineeringJilin UniversityChangchun 130025PR China

dry sliding wear tests were performed on mg97 Zn1 Y2 alloy at various temperatures of 20,50,100,150 and 200°c using a pin-on-disc wear testing machine in order to reveal mild-severe(m-S)wear transition mechanism during elevated-temperature wear *** was shown that at each test temperature,the wear rate increased with increasing load,and all wear rate-load curves demonstrated two distinct stages *** and severe wear *** predominant wear mechanisms operating in mild and severe wear stages were analyzed,and they were indicated in the mild and severe wear regimes of a wear mechanism transition map,respectively.m-S wear transition mechanism was analyzed by comparison of microstructure transformation and hardness change in subsurfaces of samples tested in mild and severe wear stages,from which m-S wear transition mechanism was confirmed as softening of surface material arising from dynamic recrystallization(dRX)microstructure *** m-S wear transition load was found to have a linear relationship with test temperature,and decreased with rising test temperature.m-S wear transition obeyed a critical surface dRX temperature(SdT)criterion under given conditions,and the transition loads were estimated at various test temperatures by using the criterion.

关键词： mg-alloys Elevated temperatures Wear rate Wear mechanism Wear transition

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micro-scaled plastic yielding and shear-banding dynamics in metallic glasses

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Journal of materials Science & Technology 2023年第21期152卷 237-246页

作者： d.X.Han G.Wang q.Wang R.feng X.d.ma K.c.chan c.T.Liu Institute of materials Shanghai UniversityShanghai 200444China department of Industrial and Systems Engineering The Hong Kong Polytechnic UniversityHong KongChina Neutron Scattering division Oak Ridge National LaboratoryOak RidgeTN 37831United States department of material Science and Engineering College of Science and EngineeringCity University of Hong KongHong KongChina center for Advanced Structural materials College of Science and EngineeringCity University of Hong KongHong KongChina

Shear-banding behavior in metallic glasses plays a key role in the operation of plastic deformation,which is associated with yield *** a micro-scale,the shear-banding behavior must be affected by many factors from the test machine and the ***,in this study,comprehensively considering a machine compliance,a geometry imperfection of micro-pillar,and a substrate sink-in the machine-sample-substrate system,we developed a plastic-strength model at a micrometer scale in this study,which is evidenced by the microscale compressive properties of 18 kinds of metallic *** the-oretical model provides a guidance for the elastic limits and shear-banding dynamics of metallic glasses at the micro-scale,which can be applicable to characterize the microscale deformation behavior of other amorphous materials.

关键词： metallic glasses Shear-banding dynamics micro-compression Plastic deformation

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Terahertz Semiconductor quantum Well devices

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Journal of Semiconductors 2006年第4期27卷 627-634页

作者： Liu H c Luo H Ban d Waichter m Song c Y Wasilewski Z R Buchanan m Aers G c SpringThorpe A J cao J c feng S L Williams B S Hu q Institute for microstructural Sciences National Research Council Ottawa K1A 0R6 Canada State Key Laboratory of functional materials for Informatics Shanghai Institute of Microsystem and Information Technology Chinese AcademyofSciences Shanghai 200050 China department of Electrical Engineering and computer Science and Research Laboratory of Electronics Massachusetts Institute of Technology Cambridge Massachusetts 02139 USA

For eventually providing terahertz science with compact and convenient devices,terahertz (1～10THz) quantum-well photodetectors and quantum-cascade lasers are *** design and projected detector performance are presented together with experimental results for several test devices,all working at photon energies below and around optical *** limited infrared performance (BLIP) operations are observed for all samples (three in total),designed for different *** temperatures of 17,13,and 12K are achieved for peak detection frequencies of 9.7THz(31μm),5.4THz(56μm),and 3.2THz(93μm),respectively.A set of THz quantum-cascade lasers with identical device parameters except for doping concentration is *** δ-doping density for each period varies from 3.2×1010 to 4.8×*** observe that the lasing threshold current density increases monotonically with doping ***,the measurements for devices with different cavity lengths provide evidence that the free carrier absorption causes the waveguide loss also to increase *** the observed maximum lasing temperature is best at a doping density of 3.6×1010cm-2.

关键词：半导体量子论激光技术光电探测器

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Hot workability characteristics of Rene88dT superalloy with directionally solidified microstructure

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Rare metals 2015年第1期34卷 51-63页

作者： fu-Lin Li Rui fu di feng Zhi-Ling Tian Superalloy department Central Iron & Steel Research Institute

The hot deformation characteristics of Rene88dT superalloy with directionally solidified micro- structure produced by electroslag remelting continuous directionally solidification （ESR-cdS） were studied in the temperature range of 1,040-1,140 ℃ and strain rate range of 0.001-1.000 s-1 by hot compression tests. Flow curves for Rene88dT alloy with initial directionally solidified （dS） microstructure exhibit pronounced peak stresses at the early stage of deformation followed by the occurrence of dynamic softening phenomenon. Rene88dT alloy with dS micro- structure shows higher flow peak stresses compared with HIPed P/m superalloy FGH4096, but the disparities in peak stresses between ESR-cdSed Rene88dT and HIPed P/m superalloy FGH4096 reduce as temperature increases. The improvement of hot workability of dS alloy with columnar grains avoiding the maximum shear stress comes true. A hot deformation constitutive equation as a function of strain that describes the dependence of flow stress on strain rate and temperature is established. Hot deformation apparent acti- vation energy （q） varies not only with the strain rate and temperature but also with strain. The strain rate sensitivity exponent （m） map is established at the strain of 0.8, which reveals that global dynamic recrystallization （dRX） shows a relatively high m value in a large strain compression. Optimum parameters are predicted in two regions： T = 1,100-1,130 ℃, ε = 0.100-1.000 s-1 and T = 1,080- 1,100 ℃, ε = 0.010-100 s-1, which is based on pro- cessing maps and deformation microstructure observations.

关键词： Rene88dT alloy directional solidification Isothermal compression constitutive equation Processingmap

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Targeted Ptpn11 deletion in mice reveals the essential role of SHP2 in osteoblast differentiation and skeletal homeostasis

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Bone Research 2021年第1期9卷 75-85页

作者： Lijun Wang Huiliang Yang Jiahui Huang Shaopeng Pei Liyun Wang Jian q.feng dian Jing Hu Zhao Henry m.Kronenberg douglas c.moore Wentian Yang department of Orthopedic Surgery Brown University Alpert Medical School and Rhode Island HospitalProvidenceRI 02903USA department of mechanical Engineering University of DelawareNewarkDE DE19716USA department of Biomedical Sciences Texas A&M College of Dentistry3302 Gaston AveDallasTX 75246USA department of comprehensive dentistry Texas A&M College of Dentistry3302 Gaston AveDallasTX 75246USA Endocrine Unit Massachusetts General Hospital and Harvard Medical SchoolBostonMA 02114USA

The maturation and function of osteoblasts(OBs)rely heavily on the reversible phosphorylation of signaling *** date,most of the work in OBs has focused on phosphorylation by tyrosyl kinases,but little has been revealed about dephosphorylation by protein tyrosine phosphatases(PTPases).SHP2(encoded by PTPN11)is a ubiquitously expressed ***11 mutations are associated with both bone and cartilage manifestations in patients with Noonan syndrome(NS)and metachondromatosis(mc),although the underlying mechanisms remain ***,we report that SHP2 deletion in bone gamma-carboxyglutamate protein-expressing(Bglap+)bone cells leads to massive osteopenia in both trabecular and cortical bones due to the failure of bone cell maturation and enhanced osteoclast activity,and its deletion in Bglap+chondrocytes results in the onset of enchondroma and osteochondroma in aged mice with increased tubular bone ***,SHP2 was found to be required for osteoblastic differentiation by promoting RUNX2/OSTERIX signaling and for the suppression of osteoclastogenesis by inhibiting STAT3-mediated RANKL production by osteoblasts and *** findings are likely to explain the compromised skeletal system in NS and mc patients and to inform the development of novel therapeutics to combat skeletal disorders.

关键词： skeletal homeostasis SHP2

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Transfer or blockage:Unraveling the interaction between deformation twinning and grain boundary in tantalum under shock loading with molecular dynamics

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Journal of materials Science & Technology 2023年第25期156卷 118-128页

作者： Z.c.meng m.m.Yang A.H.feng S.J.qu F.Zhao L.Yang J.H.Yao Y.Yang q.B.Fan H.Wang Interdisciplinary centre for Additive manufacturing (IcAm) School of Materials and ChemistryUniversity of Shanghai for Science and TechnologyShanghai 200093China Institute of metal Research Chinese Academy of SciencesShenyang 110016China School of materials Science and Engineering University of Science and Technology of ChinaShenyang 110016China School of materials Science and Engineering Tongji UniversityShanghai 201804China Academy for Advanced Interdisciplinary Studies Southern University of Science and TechnologyShenzhen 518055China National Key Laboratory of Science and Technology on materials Under Shock and Impact School of Materials Science and EngineeringBeijing Institute of TechnologyBeijing 100081China Beijing Institute of Technology chongqing Innovation center Chongqing 401135China

The interaction between{112}deformation twinning and grain boundary in coaxial polycrystalline tantalum under shock compression was studied with molecular dynamics simulation under different grain pair misorientation angles(mA)and geometric compatibility factor(m’).Generally,in the coaxial polycrystal,the value of mA determines the occurrence of twin transfer(TT)or twin blockage(TB),i.e.,twin transfer occurs at mA≤29°with twin blockage *** TT,the value of m’affects the selection of twin variants.,i.e.,the twin system with a larger m’is easier to *** morphology of twin pairs is ruler-shaped and lenticular under TT and TB,respectively,with different thickening mechanisms,including grain boundary dislocation emission.

关键词： Plasticity Grain boundary Twin Atomistic simulation Tantalum

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Suppressing tumor growth of nasopharyngeal carcinoma by hTERTc27 polypeptide delivered through adeno-associated virus plus adenovirus vector cocktail

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chinese Journal of cancer 2012年第12期31卷 588-597页

作者： Xiong Liu Xiang-Ping Li Ying Peng Samuel S.Ng Hong Yao Zi-feng Wang Xiao-mei Wang Hsiang-fu Kung marie c.m. Lin department of Otolaryngology Nanfang Hospital Nanfang Medical UniversityGuangzhou Guangdong 510515 P. R. China department of Neurology The Sun Yat-sen Memorial Hospital Sun Yat-sen UniversityGuangzhou Guangdong 510120 P. R. China Brain Tumor center Divison of Neurosurgery Department of Surgery The Chinese University of Hong KongShatin Hong Kong China center for Emerging Infectious diseases The Chinese University of Hong Kong ShatinHong Kong P. R. China medical college Shenzhen UniversityShenzhen Guangdong 518061 P. R. China

Nasopharyngeal carcinoma(NPc) is a metastatic carcinoma that is highly prevalent in Southeast Asia. Our laboratory has previously demonstrated that the c-terminal 27-kda polypeptide of human telomerase reverse transcriptase (hTERTc27) inhibits the growth and tumorigenicity of human glioblastoma and melanoma cells. In this study, we investigated the antitumor effect of hTERTc27 in human c666-1 NPc cells xenografted in a nude mouse model. A cocktail of vectors comprising recombinant adeno-associated virus (rAAV) and recombinant adenovirus (rAdv) that each carry hTERTc27 (rAAV-hTERTc27 and rAdv- hTERTc27; the cocktail was abbreviated to rAAV/rAdv-hTERTc27) was more effective than either rAAV- hTERTc27 or rAdv-hTERTc27 alone in inhibiting the growth of c666-1 NPc xenografts. furthermore, we established three tumors on each mouse and injected rAAV/rAdv-hTERTc27 into one tumor per mouse. Although hTERTc27 expression could only be detected in the injected tumors, reduced tumor growth was observed in the injected tumor as well as the uninjected tumors, demonstrating that the vector cocktail could provoke an antitumor effect on distant, metastasized tumors. further studies showed the observed antitumor effects included inducing necrosis and apoptosis and reducing microvessel density. Together, our data suggest that the rAAV/rAdv-hTERTc27 cocktail can potently inhibit NPc tumor growth in both local and metastasized tumors and should be further developed as a novel gene therapy strategy for NPc.

关键词：重组腺相关病毒抑制肿瘤生长抑制腺病毒载体鸡尾酒鼻咽癌多肽人端粒酶逆转录酶

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conductive and corrosion behaviors of silver-doped carbon-coated stainless steel as PEmFc bipolar plates

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International Journal of minerals,metallurgy and materials 2016年第7期23卷 844-849页

作者： ming Liu Hong-feng Xu Jie fu Ying Tian college of Environmental and chemical Engineering Dalian Jiaotong University

Ni–cr enrichment on stainless steel SS316 L resulting from chemical activation enabled the deposition of carbon by spraying a stable suspension of carbon nanoparticles; trace Ag was deposited in situ to prepare a thin continuous Ag-doped carbon film on a porous carbon-coated SS316 L substrate. The corrosion resistance of this film in 0.5 mol·L^（-1） H_2SO_4 solution containing 5 ppm F- at 80°c was investigated using polarization tests. The results showed that the surface treatment of the SS316 L strongly affected the adhesion of the carbon coating to the stainless steel. compared to the bare SS316 L, the Ag-doped carbon-coated SS316 L bipolar plate was remarkably more stable in both the anode and cathode environments of proton exchange membrane fuel cell（PEmFc） and the interface contact resistance between the specimen and Toray 060 carbon paper was reduced from 333.0 m？·cm^2 to 21.6 m？·cm^2 at a compaction pressure of 1.2 mPa.

关键词： proton exchange membrane fuel cells bipolar plates stainless steel silver carbon spraying corrosion

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contributions of annual and semiannual tidal constituents to chart datum in the china seas and adjacent waters

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Acta Oceanologica Sinica 2023年第10期42卷 127-136页

作者： Yikai feng Yanguang fu Long Yang dongxu Zhou First Institute of Oceanography Ministry of Natural ResourcesQingdao 266061China

Global uniform chart datum(cd)surface construction is the basic upon which to realize various vertical datums transformation,and is of great importance for geospatial data expression under the same vertical ***,the cd level is computed by developing the function between tidal constituents’harmonic constants and time,i.e.,the lowest astronomical tide is taken as the lowest predicted tide level by adopting the major constituents over a 19-a *** cd surface prescribed in china is the theoretical lowest tide(TLT)and is calculated using 13 tidal constituents,i.e.,short-period(q_(1),O_(1),P_(1),K_(1),N_(2),m_(2),S_(2),K_(2),m_(4),mS_(4)and m_(6))and long-period(Sa and Ssa)tidal *** the accuracy in determining short-period tidal constituents has improved gradually,the long-period tide has not been studied thoroughly owing to nonstationary and temporal *** studies have intended to evaluate the effect of Sa and Ssa tides in the determination of the TLT level for the purpose of determining a more accurate cd surface for the china seas and adjacent ***,the parameters of long-period tidal correction and long-period tidal correction rate were treated as the effect of both Sa and Ssa on the TLT,and the TOPEX/Poseidon and Jason series satellite altimetry data ranged from October 1992 to April 2022 were adopted to analyze the contribution of long-period tidal *** showed that the average long-period correction value is 10.10 cm(range from 8.57 cm to 14.98 cm),and that the average long-period tidal contribution rate is 14.56%(range from 9.09%to 23.97%)in the china seas and adjacent ***,data from 82 tide gauge station with at least a 1-a record of hourly observations were compared with satellite-derived *** concluded that the long-period tidal contribution should not be neglected in TLT ***,to reduce tidal datum uncertainty,accurate extraction of long-period tidal constit

关键词： tidal datum chart datum long-period tidal constituent lowest normal low water china seas and adjacent waters

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