We present a study of magnetic transport and radiation properties during compression of a magnetized laboratory plasma.A theta pinch is used to produce a magnetized plasma column undergoing radial implosion,with plasm...We present a study of magnetic transport and radiation properties during compression of a magnetized laboratory plasma.A theta pinch is used to produce a magnetized plasma column undergoing radial implosion,with plasma parameters comprehensively measured through diverse diagnostic techniques.High-resolution observations show the implosion progressing through three stages:compression,expansion,and recompression.An anomalous demagnetization phenomenon is observed during the first compression stage,wherein the magnetic field at the plasma center is depleted as the density increases.We reveal the demagnetization mechanism and formulate a straightforward criterion for determining its occurrence,through analysis based on extended-magnetohydrodynamics theory and a generalized Ohm’s law.Additionally,we quantitatively evaluate the radiation losses and magnetic field variations during the two compression stages,providing experimental evidence that magnetic transport can influence the radiation properties by altering the plasma hydrodynamics.Furthermore,extrapolated results using our findings reveal direct relevance to magnetized inertial confinement fusion,space,and astrophysical plasma scenarios.展开更多
One new species of the genus Ourapteryx Leach,1814,from Jilong Valley,Xizang,China,is described:O.jilongensis sp.nov.Illustrations of external features and male genitalia of this new species are provided.Morphology tr...One new species of the genus Ourapteryx Leach,1814,from Jilong Valley,Xizang,China,is described:O.jilongensis sp.nov.Illustrations of external features and male genitalia of this new species are provided.Morphology traits are compared with two other closely-related species,O.excellens Butler,1889 and O.convergens Warren,1897.展开更多
We report the successful application of a surgical and medical co‐management(SMC)strategy in an 82‐year‐old man with hemophilia A(HA)undergoing pancreaticoduodenectomy for pancreatic head carcinoma.No major complic...We report the successful application of a surgical and medical co‐management(SMC)strategy in an 82‐year‐old man with hemophilia A(HA)undergoing pancreaticoduodenectomy for pancreatic head carcinoma.No major complications or perioperative bleeding occurred.Optimal management of HA patients undergoing major surgery requires multidisciplinary coordination to avoid postoperative complications.The SMC team integrates internists(who assess chronic disease status,adjust medications,and determine best hemostatic therapies)and surgeons(who evaluate the surgical feasibility of procedures and rely on advanced surgical skills)to improve perioperative planning to minimize complications and promote recovery.This case illustrates the utility of a shift from passive and conservative treatment to active and preventive treatment and highlights the value of SMC in many complex clinical situations.展开更多
Inelastic collisions are the dominant cause of energy loss in radiotherapy.In the energy range around the Bragg peak,single ionization(SI)and single-electron capture(SC)are the primary inelastic collisions that lead t...Inelastic collisions are the dominant cause of energy loss in radiotherapy.In the energy range around the Bragg peak,single ionization(SI)and single-electron capture(SC)are the primary inelastic collisions that lead to energy loss.This study employs the classical trajectory Monte Carlo method to study the SI and SC processes of H_(2)O molecules using He^(2+) and C^(6+) projectiles in the energy range of 10 keV/u to 10 MeV/u.The total cross sections,single differential cross sections,impact parameter dependence of SI and SC,and fragmentation cross sections were investigated.Results illustrate that the cross section for SI is the highest when the projectile energy is close to the Bragg peak energy.When the projectile energy is below the Bragg peak energy,the ionized electrons in the forward direction dominate,and the removal of electrons can be associated with large impact parameters.As the projectile energy increases,the emission angle of the electrons gradually transitions from small angles(60°~120°)to large angles(60°~120°),and the removal of electrons is associated with small impact parameters.The energy distributions of the ionized electron are similar when the projectile energy is equal to,below or above the Bragg peak energy.The fragmentation cross sections after SI and SC in the energy range around the Bragg peak were also estimated.展开更多
Eleven new species of Ourapteryx Leach,1814 were described:O.curta Jiang&Han,sp.nov.,O.triangulata Cheng&Han,sp.nov.,O.cawarongensis Cheng&Jiang,sp.nov.,O.arcuata Jiang&Cheng,sp.nov.,O.longiacutata Jia...Eleven new species of Ourapteryx Leach,1814 were described:O.curta Jiang&Han,sp.nov.,O.triangulata Cheng&Han,sp.nov.,O.cawarongensis Cheng&Jiang,sp.nov.,O.arcuata Jiang&Cheng,sp.nov.,O.longiacutata Jiang&Cheng,sp.nov.,O.linzhiensis Jiang&Cheng,sp.nov.,O.aniqiaoensis Cheng&Zhu,sp.nov.,O.incurvata Cheng&Jiang,sp.nov.,O.concava Cheng&Han,sp.nov.,O.alba Cheng&Han,sp.nov.,O.motuoensis Cheng&Zhu,sp.nov.Diagnoses for these new species are provided,with illustrations of external features and genitalia.展开更多
Facile and efficient method for constructing carbon dots(CDs)with narrow full width at half maximum(FWHM)is a major challenge in the field,and researches on regulating the FWHM of CDs are also rare and scarce.In this ...Facile and efficient method for constructing carbon dots(CDs)with narrow full width at half maximum(FWHM)is a major challenge in the field,and researches on regulating the FWHM of CDs are also rare and scarce.In this work,we delved into the synthesis of CDs with narrow fluorescence emission FWHM(NFEF-CDs)in the m-phenylenediamine(m-PD)/ethanol system,utilizing solid superacid resin as cata-lyst with solvothermal method.The resulting NFEF-CDs exhibit a photoluminescent(PL)emission peak at 521 nm with a narrow FWHM of 41 nm,an absolute PL quantum yield(QY)of 80%,and display excitation-independent PL behavior.Through comprehensive characterization,we identified the protonation of edge amino on NFEF-CDs as the key factor in achieving the narrow FWHM.Subsequently,we validated the broad applicability of solid superacid resins as catalysts for synthesizing CDs with narrow FWHM in the m-PD/ethanol system.Finally,we utilized a self-leveling method to prepare NFEF-CDs film on the surface of poly(methyl methacrylate)(PMMA)substrate and investigated the solid-state fluorescence properties of NFEF-CDs as well as their performance as luminescence solar concentrator(LSC)for photovoltaic conver-sion.The results revealed that the as-prepared LSC exhibit an internal quantum efficiency(η_(int))of 42.39%and an optical efficiency(η_(opt))of 0.68%.These findings demonstrate the promising prospects of NFEF-CDs in the field of LSCs and provide a theoretical basis for their application in photovoltaic conversion.展开更多
High-performance carbon dots(CDs)allowing the application in high-end display devices are highly desirable and usually limited by the absence of simple and easy synthesis methods.In this work,we exploited an easy-to-i...High-performance carbon dots(CDs)allowing the application in high-end display devices are highly desirable and usually limited by the absence of simple and easy synthesis methods.In this work,we exploited an easy-to-implement strategy for the one-step synthesis of green-emitting CDs(G-CDs)with superb optical properties.The G-CDs were synthesized using m-phenylenediamine(m-PD)as a single precursor,and the reaction reacted at 180℃for 12 h The resultant G-CDs exhibit high-purity and excitationindependent green fluorescence with the photoluminescence(PL)peak located at 516 nm,full width at half maximum(FWHM)of 46 nm,and PL quantum yield(QY)of∼80%under the 470nm excitation light.The G-CDs and corresponding composite film prepared with polyvinyl butyral(G-CDs@PVB)exhibit good PL stability after undergoing long-time storage for one year and 360 h exposure under 460nm blue light.The G-CDs@PVB film was used as color-conversion materials in green-emitting light-emitting diode(LED)application,exhibiting a Commission internationale de l’Eclairage(CIE)chromaticity coordinate of(0.21,0.44).The film was also used in CD-based liquid crystal display(CD-LCD)application,achieving a color gamut value of 85%.This work will offer a working basis for the synthesis of high-performance CDs as well as their application in displays.展开更多
In this work, hierarchical BiOBr<sub>1<span style="white-space:nowrap;">−x</sub>I<sub>x</sub>/BiOBr heterojunction photocatalyst with a microsphere morphology was synth...In this work, hierarchical BiOBr<sub>1<span style="white-space:nowrap;">−x</sub>I<sub>x</sub>/BiOBr heterojunction photocatalyst with a microsphere morphology was synthesized by a facile solvothermal process. It demonstrated that the local structure of the photocatalysts was highly distorted due to the substitution of bromide ions by iodine ions. The photocatalytic properties were evaluated by the photodecomposition of aqueous phenol solution under visible-light irradiation. The results indicated that all the composite photocatalysts exhibited high photocatalytic activity. In particularly, the BiOBr<sub>1<span style="white-space:nowrap;">−x</sub>I<sub>x</sub>/BiOBr (x = 0.25) sample exhibited over 92% degradation efficiency of phenol within 150 min, which is 24.6 and 3.08 fold enhancement in the photocatalytic activity over the pure phased BiOBr and BiOI, respectively. Moreover, this excellent photocatalytic property can be expanded to other colorless organic contaminants, verifying the common applicability of BiOBr<sub>1<span style="white-space:nowrap;">−x</sub>I<sub>x</sub>/BiOBr (x = 0.25) as an excellent visible-light photocatalyst for organics decomposition. The significant improvement in the photocatalytic activity can be explained by the high efficiency of charge separation due to the enhancement in the internal electric fields and band match that comes from the local structure distortion. This work provides valuable information for the design of highly active photocatalysts toward the environmental remediation.展开更多
Pd modified electrodes possess problems such as easy agglomeration and low electrolytic ability,and the use of manganese dioxide(MnO_(2)) to facilitate Pd reduction of organic pollutants is just started.However,there ...Pd modified electrodes possess problems such as easy agglomeration and low electrolytic ability,and the use of manganese dioxide(MnO_(2)) to facilitate Pd reduction of organic pollutants is just started.However,there is still a limited understanding of how to match the Pd load and MnO_(2) to realize optimal dechlorination efficiency at minimum cost.Here,a Pd/MnO_(2)/Ni foam cathode was successfully fabricated and applied for the efficient electrochemical dechlorination of 2,4,6-trichlorophenol(2,4,6-TCP).The optimal electrocatalytic hydrodechlorination(ECH)performance with 2,4,6-TCP dechlorination efficiency(92.58%in 180 min)was obtained when the concentration of PdCl_(2) precipitation was 1 mmol/L,the deposition time of MnO_(2) was 300 s and cathode potential was-0.8 V.Performance influenced by the exogenous factors(e.g.,initial pH and coexisted ions)were further investigated.It was found that the neutral pH was the most favorable for ECH and a reduction in dechlorination efficiency(6%~47.6%)was observed in presence of 5 mmol/L of NO_(2)^(-),NO_(3)^(-),S^(2-)or SO_(3)^(2-).Cyclic voltammetry(CV)and quenching experiments verified the existence of three hydrogen species on Pd surface,including adsorbed atomic hydrogen(H^(*)_(ads)),absorbed atomic hydrogen(H^(*)_(abs)),and molecular hydrogen(H_(2)).And the introduction of MnO_(2)promoted the generation of atomic H^(*).Only adsorbed atomic hydrogen(H^(*)_(ads)) was confirmed that it truly facilitated the ECH process.Besides H^(*)_(ads) induced reduction,the direct reduction by cathode electrons also participated in the 2,4,6-TCP dechlorination process.Pd/MnO_(2)/Ni foam cathode shows excellent dechlorination performance,fine stability and recyclable potential,which provides strategies for the effective degradation of persistent halogenated organic pollutants in groundwater.展开更多
Zika virus(ZIKV)has been isolated from mosquitoes such as Aedes,Mansonia uniformis,and Culex perfuscus;However,the isolation of ZIKV from Anopheles sinensis and Culex tritaeniorhynchus has not yet been reported.In Jun...Zika virus(ZIKV)has been isolated from mosquitoes such as Aedes,Mansonia uniformis,and Culex perfuscus;However,the isolation of ZIKV from Anopheles sinensis and Culex tritaeniorhynchus has not yet been reported.In June and July2018,22,985 mosquitoes and 57,500 midges were collected in Jiangxi Province in southeastern China.Among them,six strains of ZIKV were isolated from mosquitoes:four from An.sinensis and two from Cx.tritaeniorhynchus.Molecular genetic analysis showed that the ZIKV isolated from An.sinensis and Cx.tritaeniorhynchus belonged to genotype 2 in the Asian evolutionary branch of ZIKV.In addition,the ZIKV strains isolated from An.sinensis and Cx.tritaeniorhynchus had amino acid substitutions identical to ZIKV strains prevalent in South America since 2015.This study is the first to isolate ZIKV from mosquito specimens collected in the wild of Jiangxi Province,China;This is also the first time that ZIKV has been isolated from An.sinensis and Cx.tritaeniorhynchus.Given that An.sinensis and Cx.tritaeniorhynchus have a very wide geographical distribution in China and even in eastern and southern Asia,the isolation of several strains of ZIKV from these two mosquitoes poses new challenges for the prevention and control of ZIKV infection in the mainland of China and countries and regions with the same distribution of mosquitoes.展开更多
Development of highly active and stable non-noble electrocatalysts with well-defined nanostructures is crucial for efficient hydrogen evolution reaction(HER). Herein, a novel three-dimensional(3D) selfsupported electr...Development of highly active and stable non-noble electrocatalysts with well-defined nanostructures is crucial for efficient hydrogen evolution reaction(HER). Herein, a novel three-dimensional(3D) selfsupported electrode consists of vanadium nitride(VN) nanodots and Co nanoparticles co-embedded and highly active single Co atoms anchored in N-doped carbon nanotubes supported on carbon cloth(VN-Co@CoSAs-NCNTs/CC) is fabricated via a one-step in situ nanoconfined pyrolysis strategy, which shows remarkable enhanced HER electrocatalytic activity in acidic medium. During pyrolysis, the formed VN nanodots induce the generation of atomic Co Nxsites in NCNTs, contributing to superior electrocatalytic activity. Experimental and density functional theory(DFT) calculation results reveal that the electrode has multiple accessible active sites, fast reaction kinetics, low charge/mass transfer resistances,high conductivity, as well as downshifted d-band center with a thermodynamically favorable hydrogen adsorption free energy(△G_(H·)), all of which greatly boost the HER performance. As a result, the VNCo@CoSAs-NCNTs/CC electrode displays superb catalytic performance toward HER with a low overpotential of 29 mV at 10 mA cm^(-2) in acidic medium, which could maintain for at least 60 h of stable performance. This work opens a facile avenue to explore low-cost, high performance, but inexpensive metals/nitrogen-doped carbon composite electrocatalysts for HER.展开更多
Facile strategy enabling the fabrication of carbon dots(CDs)with favorable performance useful for various applications is highly desirable.Here,we report the fabrication of highly fluorescent carbon dots(CDs)towards s...Facile strategy enabling the fabrication of carbon dots(CDs)with favorable performance useful for various applications is highly desirable.Here,we report the fabrication of highly fluorescent carbon dots(CDs)towards sensitive metal ion detection,brightly fluorescent printing pattern,as well as green flame retardants for synthetic polymeric materials.CDs are synthesized by solvothermal treatment of polypropylene carbonate(PPC)with ethylenediamine,and the quantum yield of CDs could increase from 30%to 86%by further adding trace of citric acid.The abundant functional groups on the surface of CDs allow CDs well incorporated into polymers to form CD-loaded polystyrene(PS)microspheres,which are employed to construct fluorescent supraballs via triphase microfluidic technique and used as“inks”for uniform fluorescent patterns.Interestingly,the resultant CDs show good flame retardancy for highly flammable polymeric foams and fibers.The CDs surpass previously reported flame-retardant additives,to show excellent combustion resistance that the addition of 20 wt%CDs causes 75%decrease in the peak of heat release rate(P-HRR)for polyurethane(PU)foams.Significantly,a molecular dynamics simulation process for PU/CDs combustion is constructed.This work may spur the preparation and application of highperformance carbon-based nanomaterials.展开更多
Ultrafast imaging tools are of great importance for determining the dynamic density distribution in high energy density(HED)matter.In this work,we designed a high energy electron radiography(HEER)system based on a lin...Ultrafast imaging tools are of great importance for determining the dynamic density distribution in high energy density(HED)matter.In this work,we designed a high energy electron radiography(HEER)system based on a linear electron accelerator to evaluate its capability for imaging HED matter.40 MeV electron beams were used to image an aluminum target to study the density resolution and spatial resolution of HEER.The results demonstrate a spatial resolution of tens of micrometers.The interaction of the beams with the target and the beam transport of the transmitted electrons are further simulated with EGS5 and PARMELA codes,with the results showing good agreement with the experimental resolution.Furthermore,the experiment can be improved by adding an aperture at the Fourier plane.展开更多
The research activities on warm dense matter driven by intense heavy ion beams at the new project High Intensity heavy-ion AcceleratorFacility (HIAF) are presented. The ion beam parameters and the simulated accessible...The research activities on warm dense matter driven by intense heavy ion beams at the new project High Intensity heavy-ion AcceleratorFacility (HIAF) are presented. The ion beam parameters and the simulated accessible state of matter at HIAF are introduced, respectively. Theprogresses of the developed diagnostics for warm dense matter research including high energy electron radiography, multiple-channel pyrometer,in-situ energy loss and charge state of ion detector are briefly introduced.展开更多
Perovskite quantum dots(PQDs) possess remarkable optical properties, such as tunable photoluminescence(PL) emission spectra, narrow full width at half maximum(FWHM) and high PL quantum yield(QY), endowing the PQDs gre...Perovskite quantum dots(PQDs) possess remarkable optical properties, such as tunable photoluminescence(PL) emission spectra, narrow full width at half maximum(FWHM) and high PL quantum yield(QY), endowing the PQDs great application prospects. However, the inherent structural instability of PQDs has seriously hindered the application of PQDs in various photoelectric devices. In this work, a microfluidic electrospinning method was used to fabricate color-tunable fluorescent formamidinium lead halogen(FAPbX_(3), X = Cl, Br, I) PQDs/polymer core-shell nanofiber films. The core-shell spinning nanofiber not only supplies the interspace for the in-situ formation of PQDs, but also significantly reduces the permeability of moisture and oxygen in the air, which greatly improves the stability of PQDs. After adjusting the composition of precursors, the blue-emissive polystyrene(core) and polymethyl methacrylate(shell) coated FAPbCl_(3) QDs(abbreviated as PS/FAPbCl_(3)/PMMA, hereinafter), green-emissive PS/FAPbBr_(3)/PMMA and redemissive PS/FAPbI_(3)/PMMA nanofiber films were fabricated with the highest PL QY of 82.3%. Moreover,the PS/FAPbBr_(3)/PMMA nanofiber film exhibits great PL stability under blue light irradiation, long-term storage in the air and water resistance test. Finally, the green-and red-emissive nanofiber films were directly applied as light conversion films to fabricate wide-color-gamut display with the color gamut of 125%, indicating their tremendous potentials in optoelectronic applications.展开更多
AIM：To reveal the role of miRNA in retinopathy of prematurity（ROP） by bioinformatics analysis.METHODS：The raw data of this study came from the researches of Wang et al and Zhao et al who analyzed the micro RNA（mi...AIM：To reveal the role of miRNA in retinopathy of prematurity（ROP） by bioinformatics analysis.METHODS：The raw data of this study came from the researches of Wang et al and Zhao et al who analyzed the micro RNA（mi RNA） expression profile between ROP and controls.Based on the identified differentially expressed miRNA,the related target genes,lnc RNA and circ RNA were predicted.Then we performed functional enrichment analysis to further analyze the functions of target genes.RESULTS：Hsa-mi RNA-128-3 p and hsa-mi RNA-9-5 p showed significantly different expression in both studies.Lnc RNA of POLDIP2,GAS5,NEFL and UHRF1,circ RNA of ZNF280 C_hsa_circ_001211 and SIAE_hsa_circ_002083,tar get gene of QKI showed meaningful differential expression in ROP.Enrichment analysis showed that TGF-β signaling pathway,PI3 K-Akt signaling pathway and MAPK signaling pathway might play important roles in the prog ress of ROP.CONCLUSION：This research may provide a comprehensive bioinformatics analysis of differentially expressed miR NAs which are possibly involved in ROP.展开更多
X-ray emission from the collisions of 3 MeV Ar^(11+)ions with V,Fe,Co,Ni,Cu,and Zn is investigated.Both the x-rays of the target atom and projectile are observed simultaneously.The x-ray yield is extracted from the or...X-ray emission from the collisions of 3 MeV Ar^(11+)ions with V,Fe,Co,Ni,Cu,and Zn is investigated.Both the x-rays of the target atom and projectile are observed simultaneously.The x-ray yield is extracted from the original count.The inner-shell ionization cross section is estimated by the binary encounter approximation model and compared with the experimental result.The remarkable result is that the Ar K-shell x-ray yield is diminished with the target atomic number increasing,which is completely opposite to the theoretical calculation.That is interpreted by the competitive consumption of the energy loss for the ionization of inner-shell electrons between the projectile and target atom.展开更多
Valuable application prospects and large-scale production technologies are powerful driving forces for the development of materials science.Carbon dots(CDs)are a kind of promising carbon-based fluorescent nanomaterial...Valuable application prospects and large-scale production technologies are powerful driving forces for the development of materials science.Carbon dots(CDs)are a kind of promising carbon-based fluorescent nanomaterials,which possess wide application prospects based and even beyond the fluorescence properties.Herein,we report the fast and high-yield synthesis of CDs and the large-scale preparation of fluorescent nanofiber films with enhanced mechanical properties.CDs were prepared from magnetic hyperthermia treatment of citric acid and carbamide,with the output of 25.37 g in a single batch.The asprepared CDs exhibit a high absolute photoluminescence(PL)quantum yield(QY)of 67%and wonderful dispersibility in polar solvents.Then,solution blow spinning of CDs and polymer matrixes of alcohol soluble polyurethane(APU)and polyacrylonitrile(PAN)led to large-area fluorescent CDs-embedded nanofiber films,APU/CDs(size:120 cm×18 cm)and PAN/CDs(size:120 cm×22 cm),respectively.The resultant large-area APU/CDs and PAN/CDs nanofiber films have dramatically enhanced mechanical properties,to show integrated improvement of tensile strength and elongation.展开更多
Three new species of the genus Discoglypha Warren,1896(Lepidoptera:Geometridae),D.maculata Xian&Han sp.nov.,D.obliquifascia Xian&Cheng sp.nov.and D.pupula Xian&Jiang sp.nov.,from China are described.The sp...Three new species of the genus Discoglypha Warren,1896(Lepidoptera:Geometridae),D.maculata Xian&Han sp.nov.,D.obliquifascia Xian&Cheng sp.nov.and D.pupula Xian&Jiang sp.nov.,from China are described.The species D.punctimargo(Hampson,1895),D.aureifloris Warren,1896 and D.parvifloris Prout,1917 stat.nov.are newly recorded from China.A key to eight known species from China is presented.Examined specimens and distribution of the Chinese species of Discoglypha are recorded.External features and genitalia are depicted.展开更多
Two new species of Timandra Duponchel,1829 from China are described:T.orhanti sp.nov.and T.majuscula sp.nov.Diagnoses for these new species are provided,with illustrations of external features and genitalia.
基金the State Key Development Program for Basic Research of China(Grant No.2022YFA1602503)the National Natural Science Foundation of China(Grant Nos.12120101005 and 12205247)
文摘We present a study of magnetic transport and radiation properties during compression of a magnetized laboratory plasma.A theta pinch is used to produce a magnetized plasma column undergoing radial implosion,with plasma parameters comprehensively measured through diverse diagnostic techniques.High-resolution observations show the implosion progressing through three stages:compression,expansion,and recompression.An anomalous demagnetization phenomenon is observed during the first compression stage,wherein the magnetic field at the plasma center is depleted as the density increases.We reveal the demagnetization mechanism and formulate a straightforward criterion for determining its occurrence,through analysis based on extended-magnetohydrodynamics theory and a generalized Ohm’s law.Additionally,we quantitatively evaluate the radiation losses and magnetic field variations during the two compression stages,providing experimental evidence that magnetic transport can influence the radiation properties by altering the plasma hydrodynamics.Furthermore,extrapolated results using our findings reveal direct relevance to magnetized inertial confinement fusion,space,and astrophysical plasma scenarios.
基金supported by grants from the baseline survey on diversity of pollinating insects in Qomolangma National Nature Reserve,the survey of Wildlife Resources in Key Areas of Xizang(ZL202203601,ZL202303601)a grant(CAS-TAX-24-003)from Chinese Academy of Science and the National Nature Science Foundation of China(31660495+1 种基金3217046432330013).
文摘One new species of the genus Ourapteryx Leach,1814,from Jilong Valley,Xizang,China,is described:O.jilongensis sp.nov.Illustrations of external features and male genitalia of this new species are provided.Morphology traits are compared with two other closely-related species,O.excellens Butler,1889 and O.convergens Warren,1897.
文摘We report the successful application of a surgical and medical co‐management(SMC)strategy in an 82‐year‐old man with hemophilia A(HA)undergoing pancreaticoduodenectomy for pancreatic head carcinoma.No major complications or perioperative bleeding occurred.Optimal management of HA patients undergoing major surgery requires multidisciplinary coordination to avoid postoperative complications.The SMC team integrates internists(who assess chronic disease status,adjust medications,and determine best hemostatic therapies)and surgeons(who evaluate the surgical feasibility of procedures and rely on advanced surgical skills)to improve perioperative planning to minimize complications and promote recovery.This case illustrates the utility of a shift from passive and conservative treatment to active and preventive treatment and highlights the value of SMC in many complex clinical situations.
基金supported in part by the National Natural Science Foundation of China(Nos.12105327 and 11775108)the Hunan Provincial Innovation Foundation For Postgraduate(No.QL20220210)the Advanced Energy Science and Technology Guangdong Laboratory.
文摘Inelastic collisions are the dominant cause of energy loss in radiotherapy.In the energy range around the Bragg peak,single ionization(SI)and single-electron capture(SC)are the primary inelastic collisions that lead to energy loss.This study employs the classical trajectory Monte Carlo method to study the SI and SC processes of H_(2)O molecules using He^(2+) and C^(6+) projectiles in the energy range of 10 keV/u to 10 MeV/u.The total cross sections,single differential cross sections,impact parameter dependence of SI and SC,and fragmentation cross sections were investigated.Results illustrate that the cross section for SI is the highest when the projectile energy is close to the Bragg peak energy.When the projectile energy is below the Bragg peak energy,the ionized electrons in the forward direction dominate,and the removal of electrons can be associated with large impact parameters.As the projectile energy increases,the emission angle of the electrons gradually transitions from small angles(60°~120°)to large angles(60°~120°),and the removal of electrons is associated with small impact parameters.The energy distributions of the ionized electron are similar when the projectile energy is equal to,below or above the Bragg peak energy.The fragmentation cross sections after SI and SC in the energy range around the Bragg peak were also estimated.
基金supported by grants from the survey of Wildlife Resources in Key Areas of Xizang(ZL202203601)the National Nature Science Foundation of China(32170464)+3 种基金Biological Resources Programme of Chinese Academy of Sciences(KFJ-BRP-017-45)the National Science&Technology Fundamental Resources Investigation Program of China(2019FY101800)the Second Tibetan Plateau Scientific Expedition and Research Program(STEP)(2019QZKK0501)the base line survey on diversity of pollinating insects in Qomolangma National Nature Reserve。
文摘Eleven new species of Ourapteryx Leach,1814 were described:O.curta Jiang&Han,sp.nov.,O.triangulata Cheng&Han,sp.nov.,O.cawarongensis Cheng&Jiang,sp.nov.,O.arcuata Jiang&Cheng,sp.nov.,O.longiacutata Jiang&Cheng,sp.nov.,O.linzhiensis Jiang&Cheng,sp.nov.,O.aniqiaoensis Cheng&Zhu,sp.nov.,O.incurvata Cheng&Jiang,sp.nov.,O.concava Cheng&Han,sp.nov.,O.alba Cheng&Han,sp.nov.,O.motuoensis Cheng&Zhu,sp.nov.Diagnoses for these new species are provided,with illustrations of external features and genitalia.
基金supported by the National Natural Science Foundation of China(No.22308161)the Jiangsu Funding Program for Excellent Postdoctoral Talent(No.2022ZB369),Priority Academic Program Development of Jiangsu Higher Education Institutions(PAPD).
文摘Facile and efficient method for constructing carbon dots(CDs)with narrow full width at half maximum(FWHM)is a major challenge in the field,and researches on regulating the FWHM of CDs are also rare and scarce.In this work,we delved into the synthesis of CDs with narrow fluorescence emission FWHM(NFEF-CDs)in the m-phenylenediamine(m-PD)/ethanol system,utilizing solid superacid resin as cata-lyst with solvothermal method.The resulting NFEF-CDs exhibit a photoluminescent(PL)emission peak at 521 nm with a narrow FWHM of 41 nm,an absolute PL quantum yield(QY)of 80%,and display excitation-independent PL behavior.Through comprehensive characterization,we identified the protonation of edge amino on NFEF-CDs as the key factor in achieving the narrow FWHM.Subsequently,we validated the broad applicability of solid superacid resins as catalysts for synthesizing CDs with narrow FWHM in the m-PD/ethanol system.Finally,we utilized a self-leveling method to prepare NFEF-CDs film on the surface of poly(methyl methacrylate)(PMMA)substrate and investigated the solid-state fluorescence properties of NFEF-CDs as well as their performance as luminescence solar concentrator(LSC)for photovoltaic conver-sion.The results revealed that the as-prepared LSC exhibit an internal quantum efficiency(η_(int))of 42.39%and an optical efficiency(η_(opt))of 0.68%.These findings demonstrate the promising prospects of NFEF-CDs in the field of LSCs and provide a theoretical basis for their application in photovoltaic conversion.
基金supported by the Jiangsu Funding Program for Excellent Postdoctoral Talent(No.2022ZB369)Priority Academic Program Development of Jiangsu Higher Education Institutions(PAPD).
文摘High-performance carbon dots(CDs)allowing the application in high-end display devices are highly desirable and usually limited by the absence of simple and easy synthesis methods.In this work,we exploited an easy-to-implement strategy for the one-step synthesis of green-emitting CDs(G-CDs)with superb optical properties.The G-CDs were synthesized using m-phenylenediamine(m-PD)as a single precursor,and the reaction reacted at 180℃for 12 h The resultant G-CDs exhibit high-purity and excitationindependent green fluorescence with the photoluminescence(PL)peak located at 516 nm,full width at half maximum(FWHM)of 46 nm,and PL quantum yield(QY)of∼80%under the 470nm excitation light.The G-CDs and corresponding composite film prepared with polyvinyl butyral(G-CDs@PVB)exhibit good PL stability after undergoing long-time storage for one year and 360 h exposure under 460nm blue light.The G-CDs@PVB film was used as color-conversion materials in green-emitting light-emitting diode(LED)application,exhibiting a Commission internationale de l’Eclairage(CIE)chromaticity coordinate of(0.21,0.44).The film was also used in CD-based liquid crystal display(CD-LCD)application,achieving a color gamut value of 85%.This work will offer a working basis for the synthesis of high-performance CDs as well as their application in displays.
文摘In this work, hierarchical BiOBr<sub>1<span style="white-space:nowrap;">−x</sub>I<sub>x</sub>/BiOBr heterojunction photocatalyst with a microsphere morphology was synthesized by a facile solvothermal process. It demonstrated that the local structure of the photocatalysts was highly distorted due to the substitution of bromide ions by iodine ions. The photocatalytic properties were evaluated by the photodecomposition of aqueous phenol solution under visible-light irradiation. The results indicated that all the composite photocatalysts exhibited high photocatalytic activity. In particularly, the BiOBr<sub>1<span style="white-space:nowrap;">−x</sub>I<sub>x</sub>/BiOBr (x = 0.25) sample exhibited over 92% degradation efficiency of phenol within 150 min, which is 24.6 and 3.08 fold enhancement in the photocatalytic activity over the pure phased BiOBr and BiOI, respectively. Moreover, this excellent photocatalytic property can be expanded to other colorless organic contaminants, verifying the common applicability of BiOBr<sub>1<span style="white-space:nowrap;">−x</sub>I<sub>x</sub>/BiOBr (x = 0.25) as an excellent visible-light photocatalyst for organics decomposition. The significant improvement in the photocatalytic activity can be explained by the high efficiency of charge separation due to the enhancement in the internal electric fields and band match that comes from the local structure distortion. This work provides valuable information for the design of highly active photocatalysts toward the environmental remediation.
基金supported by the NSFC-JSPS joint research program(No.51961145202)the Natural Science Foundation of Heilongjiang Province,China(No.C2018035)。
文摘Pd modified electrodes possess problems such as easy agglomeration and low electrolytic ability,and the use of manganese dioxide(MnO_(2)) to facilitate Pd reduction of organic pollutants is just started.However,there is still a limited understanding of how to match the Pd load and MnO_(2) to realize optimal dechlorination efficiency at minimum cost.Here,a Pd/MnO_(2)/Ni foam cathode was successfully fabricated and applied for the efficient electrochemical dechlorination of 2,4,6-trichlorophenol(2,4,6-TCP).The optimal electrocatalytic hydrodechlorination(ECH)performance with 2,4,6-TCP dechlorination efficiency(92.58%in 180 min)was obtained when the concentration of PdCl_(2) precipitation was 1 mmol/L,the deposition time of MnO_(2) was 300 s and cathode potential was-0.8 V.Performance influenced by the exogenous factors(e.g.,initial pH and coexisted ions)were further investigated.It was found that the neutral pH was the most favorable for ECH and a reduction in dechlorination efficiency(6%~47.6%)was observed in presence of 5 mmol/L of NO_(2)^(-),NO_(3)^(-),S^(2-)or SO_(3)^(2-).Cyclic voltammetry(CV)and quenching experiments verified the existence of three hydrogen species on Pd surface,including adsorbed atomic hydrogen(H^(*)_(ads)),absorbed atomic hydrogen(H^(*)_(abs)),and molecular hydrogen(H_(2)).And the introduction of MnO_(2)promoted the generation of atomic H^(*).Only adsorbed atomic hydrogen(H^(*)_(ads)) was confirmed that it truly facilitated the ECH process.Besides H^(*)_(ads) induced reduction,the direct reduction by cathode electrons also participated in the 2,4,6-TCP dechlorination process.Pd/MnO_(2)/Ni foam cathode shows excellent dechlorination performance,fine stability and recyclable potential,which provides strategies for the effective degradation of persistent halogenated organic pollutants in groundwater.
基金supported by grants from the National Science and Technology Major Project(2018ZX10711001,2018ZX10102001)The National Key Research and Development Program of China(2017YFC1200202)+1 种基金Science and Technology Project of Jiangxi(2014BBG70097)Development Grant of State Key Laboratory of Infectious Disease Prevention and Control(2014SKLID103,2015SKLID505)
文摘Zika virus(ZIKV)has been isolated from mosquitoes such as Aedes,Mansonia uniformis,and Culex perfuscus;However,the isolation of ZIKV from Anopheles sinensis and Culex tritaeniorhynchus has not yet been reported.In June and July2018,22,985 mosquitoes and 57,500 midges were collected in Jiangxi Province in southeastern China.Among them,six strains of ZIKV were isolated from mosquitoes:four from An.sinensis and two from Cx.tritaeniorhynchus.Molecular genetic analysis showed that the ZIKV isolated from An.sinensis and Cx.tritaeniorhynchus belonged to genotype 2 in the Asian evolutionary branch of ZIKV.In addition,the ZIKV strains isolated from An.sinensis and Cx.tritaeniorhynchus had amino acid substitutions identical to ZIKV strains prevalent in South America since 2015.This study is the first to isolate ZIKV from mosquito specimens collected in the wild of Jiangxi Province,China;This is also the first time that ZIKV has been isolated from An.sinensis and Cx.tritaeniorhynchus.Given that An.sinensis and Cx.tritaeniorhynchus have a very wide geographical distribution in China and even in eastern and southern Asia,the isolation of several strains of ZIKV from these two mosquitoes poses new challenges for the prevention and control of ZIKV infection in the mainland of China and countries and regions with the same distribution of mosquitoes.
基金supported by grants from the National Natural Science Foundation of China (21971129, 21961022, 21661023,21802076, and 21962013)the 111 Project (D20033)+2 种基金the Natural Science Foundation of Inner Mongolia Autonomous Region of China (2018BS05007)the Program of Higher-level Talents of IMU (21300-5195109)the Cooperation Project of State Key Laboratory of Baiyun Obo Rare Earth Resource Researches and Comprehensive Utilization (2017Z1950)。
文摘Development of highly active and stable non-noble electrocatalysts with well-defined nanostructures is crucial for efficient hydrogen evolution reaction(HER). Herein, a novel three-dimensional(3D) selfsupported electrode consists of vanadium nitride(VN) nanodots and Co nanoparticles co-embedded and highly active single Co atoms anchored in N-doped carbon nanotubes supported on carbon cloth(VN-Co@CoSAs-NCNTs/CC) is fabricated via a one-step in situ nanoconfined pyrolysis strategy, which shows remarkable enhanced HER electrocatalytic activity in acidic medium. During pyrolysis, the formed VN nanodots induce the generation of atomic Co Nxsites in NCNTs, contributing to superior electrocatalytic activity. Experimental and density functional theory(DFT) calculation results reveal that the electrode has multiple accessible active sites, fast reaction kinetics, low charge/mass transfer resistances,high conductivity, as well as downshifted d-band center with a thermodynamically favorable hydrogen adsorption free energy(△G_(H·)), all of which greatly boost the HER performance. As a result, the VNCo@CoSAs-NCNTs/CC electrode displays superb catalytic performance toward HER with a low overpotential of 29 mV at 10 mA cm^(-2) in acidic medium, which could maintain for at least 60 h of stable performance. This work opens a facile avenue to explore low-cost, high performance, but inexpensive metals/nitrogen-doped carbon composite electrocatalysts for HER.
基金supported by National Key Research and Development Program of China(2016YFB0401700,2018YFC1602800)National Natural Science Foundation of China(21736006)+1 种基金Fund of State Key Laboratory of Materials-Oriented Chemical Engineering(ZK201704,ZK201716)Priority Academic Program Development of Jiangsu Higher Education Institutions(PAPD)。
文摘Facile strategy enabling the fabrication of carbon dots(CDs)with favorable performance useful for various applications is highly desirable.Here,we report the fabrication of highly fluorescent carbon dots(CDs)towards sensitive metal ion detection,brightly fluorescent printing pattern,as well as green flame retardants for synthetic polymeric materials.CDs are synthesized by solvothermal treatment of polypropylene carbonate(PPC)with ethylenediamine,and the quantum yield of CDs could increase from 30%to 86%by further adding trace of citric acid.The abundant functional groups on the surface of CDs allow CDs well incorporated into polymers to form CD-loaded polystyrene(PS)microspheres,which are employed to construct fluorescent supraballs via triphase microfluidic technique and used as“inks”for uniform fluorescent patterns.Interestingly,the resultant CDs show good flame retardancy for highly flammable polymeric foams and fibers.The CDs surpass previously reported flame-retardant additives,to show excellent combustion resistance that the addition of 20 wt%CDs causes 75%decrease in the peak of heat release rate(P-HRR)for polyurethane(PU)foams.Significantly,a molecular dynamics simulation process for PU/CDs combustion is constructed.This work may spur the preparation and application of highperformance carbon-based nanomaterials.
基金Project supported by the National Natural Science Foundation of China(Grant Nos.11435015 and 11505251)the Ministry of Science and Technology of China(Grant No.2016YFE0104900)the Chinese Academy of Sciences(Grant Nos.28Y740010 and 113462KYSB20160036)
文摘Ultrafast imaging tools are of great importance for determining the dynamic density distribution in high energy density(HED)matter.In this work,we designed a high energy electron radiography(HEER)system based on a linear electron accelerator to evaluate its capability for imaging HED matter.40 MeV electron beams were used to image an aluminum target to study the density resolution and spatial resolution of HEER.The results demonstrate a spatial resolution of tens of micrometers.The interaction of the beams with the target and the beam transport of the transmitted electrons are further simulated with EGS5 and PARMELA codes,with the results showing good agreement with the experimental resolution.Furthermore,the experiment can be improved by adding an aperture at the Fourier plane.
基金This work was supported by the National Science Foun-dation of China(NSFC,Grant Nos.U1532263,11205225,11275241,11375034,11505248 and 11275238).
文摘The research activities on warm dense matter driven by intense heavy ion beams at the new project High Intensity heavy-ion AcceleratorFacility (HIAF) are presented. The ion beam parameters and the simulated accessible state of matter at HIAF are introduced, respectively. Theprogresses of the developed diagnostics for warm dense matter research including high energy electron radiography, multiple-channel pyrometer,in-situ energy loss and charge state of ion detector are briefly introduced.
基金supported by the National Natural Science Foundation of China(Nos.21736006 and 21978132)the Priority Academic Program Development of Jiangsu Higher Education Institutions(PAPD)。
文摘Perovskite quantum dots(PQDs) possess remarkable optical properties, such as tunable photoluminescence(PL) emission spectra, narrow full width at half maximum(FWHM) and high PL quantum yield(QY), endowing the PQDs great application prospects. However, the inherent structural instability of PQDs has seriously hindered the application of PQDs in various photoelectric devices. In this work, a microfluidic electrospinning method was used to fabricate color-tunable fluorescent formamidinium lead halogen(FAPbX_(3), X = Cl, Br, I) PQDs/polymer core-shell nanofiber films. The core-shell spinning nanofiber not only supplies the interspace for the in-situ formation of PQDs, but also significantly reduces the permeability of moisture and oxygen in the air, which greatly improves the stability of PQDs. After adjusting the composition of precursors, the blue-emissive polystyrene(core) and polymethyl methacrylate(shell) coated FAPbCl_(3) QDs(abbreviated as PS/FAPbCl_(3)/PMMA, hereinafter), green-emissive PS/FAPbBr_(3)/PMMA and redemissive PS/FAPbI_(3)/PMMA nanofiber films were fabricated with the highest PL QY of 82.3%. Moreover,the PS/FAPbBr_(3)/PMMA nanofiber film exhibits great PL stability under blue light irradiation, long-term storage in the air and water resistance test. Finally, the green-and red-emissive nanofiber films were directly applied as light conversion films to fabricate wide-color-gamut display with the color gamut of 125%, indicating their tremendous potentials in optoelectronic applications.
文摘AIM：To reveal the role of miRNA in retinopathy of prematurity（ROP） by bioinformatics analysis.METHODS：The raw data of this study came from the researches of Wang et al and Zhao et al who analyzed the micro RNA（mi RNA） expression profile between ROP and controls.Based on the identified differentially expressed miRNA,the related target genes,lnc RNA and circ RNA were predicted.Then we performed functional enrichment analysis to further analyze the functions of target genes.RESULTS：Hsa-mi RNA-128-3 p and hsa-mi RNA-9-5 p showed significantly different expression in both studies.Lnc RNA of POLDIP2,GAS5,NEFL and UHRF1,circ RNA of ZNF280 C_hsa_circ_001211 and SIAE_hsa_circ_002083,tar get gene of QKI showed meaningful differential expression in ROP.Enrichment analysis showed that TGF-β signaling pathway,PI3 K-Akt signaling pathway and MAPK signaling pathway might play important roles in the prog ress of ROP.CONCLUSION：This research may provide a comprehensive bioinformatics analysis of differentially expressed miR NAs which are possibly involved in ROP.
基金Project supported by the National Key R&D Program of China(Grant No.2017YFA0402300)the National Natural Science Foundation of China(Grant Nos.11505248,11775042,11875096,and 11605147)the Scientific Research Program Funded by Shaanxi Provincial Education Department,China(Grant No.20JK0975)+2 种基金the Scientific Research Plan of Science and Technology Department of Shaanxi Province,China(Grant Nos.2021JQ-812 and 2020JM-624)Open Funds of MOE Key Laboratory of Material Physics and Chemistry under Extraordinary Conditions(Grant No.MPCEC201901)Xianyang Normal University Science Foundation(Grant Nos.XSYK20009 and XSYK20024).
文摘X-ray emission from the collisions of 3 MeV Ar^(11+)ions with V,Fe,Co,Ni,Cu,and Zn is investigated.Both the x-rays of the target atom and projectile are observed simultaneously.The x-ray yield is extracted from the original count.The inner-shell ionization cross section is estimated by the binary encounter approximation model and compared with the experimental result.The remarkable result is that the Ar K-shell x-ray yield is diminished with the target atomic number increasing,which is completely opposite to the theoretical calculation.That is interpreted by the competitive consumption of the energy loss for the ionization of inner-shell electrons between the projectile and target atom.
基金supported by the National Natural Science Foundation of China(Nos.21736006 and 21978132)the National Key Research and Development Program of China(Nos.2016YFB0401700 and 2018YFC1602800)+1 种基金the Fund of the State Key Laboratory of Materials-Oriented Chemical Engineering(Nos.ZK201704 and ZK201716)the Priority Academic Program Development of Jiangsu Higher Education Institutions(PAPD)。
文摘Valuable application prospects and large-scale production technologies are powerful driving forces for the development of materials science.Carbon dots(CDs)are a kind of promising carbon-based fluorescent nanomaterials,which possess wide application prospects based and even beyond the fluorescence properties.Herein,we report the fast and high-yield synthesis of CDs and the large-scale preparation of fluorescent nanofiber films with enhanced mechanical properties.CDs were prepared from magnetic hyperthermia treatment of citric acid and carbamide,with the output of 25.37 g in a single batch.The asprepared CDs exhibit a high absolute photoluminescence(PL)quantum yield(QY)of 67%and wonderful dispersibility in polar solvents.Then,solution blow spinning of CDs and polymer matrixes of alcohol soluble polyurethane(APU)and polyacrylonitrile(PAN)led to large-area fluorescent CDs-embedded nanofiber films,APU/CDs(size:120 cm×18 cm)and PAN/CDs(size:120 cm×22 cm),respectively.The resultant large-area APU/CDs and PAN/CDs nanofiber films have dramatically enhanced mechanical properties,to show integrated improvement of tensile strength and elongation.
基金supported by the National Natural Science Foundation of China(31872966,32170464,31872967)the Science&Technology Fundamental Resources Investigation Program(2022FY202100)+3 种基金National Science&Technology Fundamental Resources Investigation Program of China(2019FY101800)Biological Resources Programme of Chinese Academy of Sciences(KFJ-BRP-017-45)by a grant(Y229YX5105)from the Key Laboratory of the Zoological Systematics and Evolution of the Chinese Academy of Sciencesthe Ministry of Science and Technology of China(2015FY210300)。
文摘Three new species of the genus Discoglypha Warren,1896(Lepidoptera:Geometridae),D.maculata Xian&Han sp.nov.,D.obliquifascia Xian&Cheng sp.nov.and D.pupula Xian&Jiang sp.nov.,from China are described.The species D.punctimargo(Hampson,1895),D.aureifloris Warren,1896 and D.parvifloris Prout,1917 stat.nov.are newly recorded from China.A key to eight known species from China is presented.Examined specimens and distribution of the Chinese species of Discoglypha are recorded.External features and genitalia are depicted.
基金the National Natural Science Foundation of China(31872966,31872967,31672331)the Ministry of Science and Technology of China(2015FY210300)the Second Tibetan Plateau Scientific Expedition and Research Program(STEP)(2019QZKK0501).
文摘Two new species of Timandra Duponchel,1829 from China are described:T.orhanti sp.nov.and T.majuscula sp.nov.Diagnoses for these new species are provided,with illustrations of external features and genitalia.
