Co_(3)S_(4)electrocatalysts with mixed valences of Co ions and excellent structural stability possess favorable oxygen evolution reaction(OER)activity,yet challenges remain in fabricating rechargeable lithiumoxygen ba...Co_(3)S_(4)electrocatalysts with mixed valences of Co ions and excellent structural stability possess favorable oxygen evolution reaction(OER)activity,yet challenges remain in fabricating rechargeable lithiumoxygen batteries(LOBs)due to their poor OER performance,resulting from poor electrical conductivity and overly strong intermediate adsorption.In this work,fancy double heterojunctions on 1T/2H-MoS_(2)@Co_(3)S_(4)(1T/2H-MCS)were constructed derived from the charge donation from Co to Mo ions,thus inducing the phase transformation of Mo S_(2)from 2H to 1T.The unique features of these double heterojunctions endow the1T/2H-MCS with complementary catalysis during charging and discharging processes.It is worth noting that 1T-Mo S2@Co3S4could provide fast Co-S-Mo electron transport channels to promote ORR/OER kinetics,and 2H-MoS_(2)@Co_(3)S_(4)contributed to enabling moderate egorbital occupancy when adsorbed with oxygen-containing intermediates.On the basis,the Li_(2)O_(2)nucleation route was changed to solution and surface dual pathways,improving reversible deposition and decomposition kinetics.As a result,1T/2H-MCS cathodes exhibit an improved electrocatalytic performance compared with those of Co_(3)S_(4)and Mo S2cathodes.This innovative heterostructure design provides a reliable strategy to construct efficient transition metal sulfide catalysts by improving electrical conductivity and modulating adsorption toward oxygenated intermediates for LOBs.展开更多
Acute respiratory tract infections(ARTIs)are among the leading causes of morbidity and mortality in children worldwide.Human adenovirus(HAdV)infections are estimated to account for at least 5%of pediatric ARTIs.The ci...Acute respiratory tract infections(ARTIs)are among the leading causes of morbidity and mortality in children worldwide.Human adenovirus(HAdV)infections are estimated to account for at least 5%of pediatric ARTIs.The circulated genotypes of HAdV and the correlation between genotype and clinical manifestations in Wuhan,China,before and after the complete relaxation of nonpharmaceutical interventions against severe acute respiratory syndrome coronavirus 2,remain unknown.Here,101 HAdV strains were isolated from throat swab samples collected from hospitalized children with ARTIs who tested positive for HAdV nucleic acid.Of these,sixty-six strains from 2022 to twenty-three strains from 2023 were successfully genotyped and subjected to phylogenetic analysis based on the hexon,penton base,and fiber genes.Six genotypes,B3,C1,C2,C5,C104,and C108 were identified.HAdV-B3(84.85%)was the most prevalent type in 2022,while HAdV-C(86.96%),including C1,C2,C108,and C104,was the most prevalent in 2023.These strains were phylogenetically related to strains from Japan,China,and the United States in recent years.When comparing clinical characteristics,pediatric patients infected with B3,C1,C2,C5,C104,or C108 exhibited similar clinical manifestations,primarily fever and cough,but varying interleukin(IL)-10 levels.In conclusion,from June 2022 to September 2023,the circulated genotypes of HAdV in Wuhan included B3,C1,C2,C108,C5,and C104.The endemic pattern of HAdV in Wuhan,China,shifted from species B as the dominant type in 2022 to species C in 2023.展开更多
PbSe materials,with their narrow bandgap,excellent optical absorption and outstanding optical response,are ideal for infrared photodetectors,exhibiting unique advantages in optical communication,infrared imaging and t...PbSe materials,with their narrow bandgap,excellent optical absorption and outstanding optical response,are ideal for infrared photodetectors,exhibiting unique advantages in optical communication,infrared imaging and thermal detection.Nevertheless,PbSe typically has a non-layered crystal structure and inherent isotropy,making the synthesis of low-dimensional nanomaterials challenging.Besides,PbSe photoconductive detectors suffer from high dark current due to intrinsic defects and thermally excited carriers,which is detrimental to device performance.Here,we utilized physical vapor deposition(PVD)method to grow high-quality PbSe nanosheets and combined them with two-dimensional(2D)transition metal dichalcogenides(TMDs)material WSe_(2)to fabricate a self-powered PbSe/WSe_(2)p-n heterostructure photodetector.Under illumination with a 650 nm laser at a power density of 128.97 mW/cm^(2)and 0 V bias,the PbSe/WSe_(2)heterojunction device exhibited significant photovoltaic characteristics and generated a short-circuit current of 161.7 nA.Furthermore,under 0.02 mW/cm^(2)of 650 nm laser illumination at 0 V bias,the device achieved an excellent responsivity(R)of 15.6 A/W and a specific detectivity(D^(*))of 1.08×10^(11)Jones.And the response speed of the heterojunction device at 0 V(511µs/74µs)was three orders of magnitude faster than that of PbSe nanosheets(93 ms/104 ms).The device also demonstrated broadband detection capabilities from 405 nm to 1550 nm and excellent imaging performance in the near-infrared region at 0 V bias.In summary,the outstanding photoelectric detection performance and imaging capabilities of the PbSe/WSe_(2)heterojunction nanosheet detector indicate its significant potential for applications in miniaturized,low-noise,broadband,high-speed and high-performance photodetectors.展开更多
Constructing S-scheme heterojunctions preserves the intrinsic redox capabilities of both semiconductors while promoting the separation of photogenerated electrons and holes,making it a promising approach for enhancing...Constructing S-scheme heterojunctions preserves the intrinsic redox capabilities of both semiconductors while promoting the separation of photogenerated electrons and holes,making it a promising approach for enhancing the properties of semiconductors.In this study,an S-scheme Cd_(0.8)Zn_(0.2)S-CeO_(2)(CZS-CeO_(2))heterojunction was successfully fabricated via the in-situ growth of CZS nanowires on CeO_(2)nanocubes.The S-scheme charge-transfer mechanism of the CZS-CeO_(2)composites during photocatalytic reactions was confirmed through in-situ X-ray photoelectron spectroscopy and density functional theory calculations.These results demonstrate that the interfacial electric field(IEF)significantly facilitates charge separation and transport within the heterojunction.Consequently,the CZS-CeO_(2)composites exhibited excellent photocatalytic hydrogen production performance under simulated sunlight irradiation,surpassing that of blank CZS.Particularly,the optimal photocatalytic hydrogen generation rate for CZS-15%CeO_(2)reached 58 mmol·g^(-1)·h^(-1),approximately 8.8 times higher than that of blank CZS.After five consecutive cycles of testing,CZS-15%CeO_(2)retained a relatively high level of activity.This enhanced stability can be attributed to the fabrication of S-scheme heterojunctions,which effectively suppressed hole-induced photocorrosion of CZS.This investigation provides a beneficial reference for the rational design of S-scheme heterojunction photocatalysts for efficient and stable photocatalytic hydrogen production.展开更多
We investigate the possible Josephson diode effect(JDE)in a two-dimensional(2D)nonmagnetic planar s-wave superconductor junction,which is constructed on a spin-collinear d-wave altermagnet(AM)material in the presence ...We investigate the possible Josephson diode effect(JDE)in a two-dimensional(2D)nonmagnetic planar s-wave superconductor junction,which is constructed on a spin-collinear d-wave altermagnet(AM)material in the presence of Rashba spin-orbit interaction.It is demonstrated that the JDE is critically dependent on the crystalline axis of the AM relative to the current direction.The d_(x^(2)-y^(2))magnetization symmetry can support a JDE whereas the dxy symmetry does not facilitate it.The JDE efficiency can reach up to 40%and can be adjusted by an additional asymmetric gate voltage applied to the non-superconducting region of the junction,including control of its polarity.Our findings provide an electrical means to control the JDE within a non-magnetic AM-based superconducting junction.展开更多
In this study,we present the fabrication of vertical SnO/β-Ga_(2)O_(3) heterojunction diode(HJD)via radio frequency(RF)reactive magnetron sputtering.The valence and conduction band offsets betweenβ-Ga_(2)O_(3) and S...In this study,we present the fabrication of vertical SnO/β-Ga_(2)O_(3) heterojunction diode(HJD)via radio frequency(RF)reactive magnetron sputtering.The valence and conduction band offsets betweenβ-Ga_(2)O_(3) and SnO are determined to be 2.65and 0.75 eV,respectively,through X-ray photoelectron spectroscopy,showing a type-Ⅱband alignment.Compared to its Schottky barrier diode(SBD)counterpart,the HJD presents a comparable specific ON-resistances(R_(on,sp))of 2.8 mΩ·cm^(2) and lower reverse leakage current(I_R),leading to an enhanced reverse blocking characteristics with breakdown voltage(BV)of 1675 V and power figure of merit(PFOM)of 1.0 GW/cm~2.This demonstrates the high quality of the SnO/β-Ga_(2)O_(3) heterojunction interface.Silvaco TCAD simulation further reveals that electric field crowding at the edge of anode for the SBD was greatly depressed by the introduction of SnO film,revealing the potential application of SnO/β-Ga_(2)O_(3) heterojunction in the futureβ-Ga_(2)O_(3)-based power devices.data mining,AI training,and similar technologies,are reserved.展开更多
A series of leaching and electrochemical experiments were conducted to elucidate the critical role of hydrogen sulfide(H_(2)S)in copper-driven reduction of chalcopyrite.Results demonstrate that in the absence of H_(2)...A series of leaching and electrochemical experiments were conducted to elucidate the critical role of hydrogen sulfide(H_(2)S)in copper-driven reduction of chalcopyrite.Results demonstrate that in the absence of H_(2)S,metallic copper converts chalcopyrite into bornite(Cu_(5)FeS_(4)).However,the introduction of H_(2)S promotes the formation of chalcocite(Cu_(2)S)by altering the oxidation pathway of copper.Electrochemical analysis demonstrates that the presence of H₂S significantly reduces the corrosion potential of copper from 0.251 to−0.223 V(vs SHE),reaching the threshold necessary for the formation of Cu_(2)S.Nevertheless,excessive H_(2)S triggers sulfate reduction via the reaction of 8Cu+H_(2)SO_(4)+3H_(2)S=4Cu_(2)S+4H_(2)O(ΔG=−519.429 kJ/mol at 50℃),leading to inefficient copper utilization.展开更多
High-performance photodetectors are expected to open up revolutionary opportunities in many application fields, such as environment monitoring, military, optical communication and biomedical science. Combining two-dim...High-performance photodetectors are expected to open up revolutionary opportunities in many application fields, such as environment monitoring, military, optical communication and biomedical science. Combining two-dimensional materials(which have tunable optical absorption and high carrier mobility) with organic materials(which are abundant with low cost, high flexibility and large-area scalability) to form thin-film heterojunctions, high-responsivity photodetectors could be predicted with fast response speed in a wide spectra region.In this review, we give a comprehensive summary of photodetectors based on two-dimensional materials and organic thin-film heterojunctions, which includes hybrid assisted enhanced devices, single-layer enhanced devices, vertical heterojunction devices and tunable vertical heterojunction devices. We also give a systematic classification and perspectives on the future development of these types of photodetectors.展开更多
[ Objective] This study aimed to investigate the effects of crude extract of Poria cocos on intestinal smooth muscle contraction of rabbits in vitro and re- veal the related mechanism. [Method] With in vitro experimen...[ Objective] This study aimed to investigate the effects of crude extract of Poria cocos on intestinal smooth muscle contraction of rabbits in vitro and re- veal the related mechanism. [Method] With in vitro experimental method, using the tension of jejunal and cecal smooth muscle as an indicator, 3.75, 7.50, 15.00, and 22.5 g/L crude extract of P. cocos were added into Tyrede＇s solution of jejunum and cecum tissues of rabbits to observe the effects of crude extract of P. cocos on motion dynamics of jejunum and cecum of rabbits. [ Result] The addition of crude extract of P. cocos could inhibit the contraction of jejunal and cecal smooth muscle of rabbits in vitro, enhance contraction tension and relaxation tension, and reduce contraction amplitude. The effects were improved as the dose of crude extract of P. cocos increased, displaying a dose-effect relationship. [Condusion] This study provided theoretical basis for the clinical use of P. cocos.展开更多
A database system,known as the large PMT characterization and instrumentation database system(LPMT-CIDS),was designed and implemented for the Jiangmen Underground Neutrino Observatory(JUNO).The system is based on a Li...A database system,known as the large PMT characterization and instrumentation database system(LPMT-CIDS),was designed and implemented for the Jiangmen Underground Neutrino Observatory(JUNO).The system is based on a Linux+Apache+MySQL+PHP(LAMP)server and focuses on modularization and architecture separation.It covers all the testing stages for the 20-inch photomultiplier tubes(PMTs)at JUNO and provides its users with data storage,analysis,and visualization services.Based on the successful use of the system in the 20-inch PMT testing program,its design approach and construction elements can be extended to other projects.展开更多
An 82-year-old female patient undergoing cardiogenic shock caused by atrioventficular junctional rhythm immediately after percutaneous coronary intervention （PCI） is described. Pharmacotherapy was invalid, and subse...An 82-year-old female patient undergoing cardiogenic shock caused by atrioventficular junctional rhythm immediately after percutaneous coronary intervention （PCI） is described. Pharmacotherapy was invalid, and subsequent application of atrial pacing reversed the cardiogenic shock. PCI-related injury of sinuatrial nodal artery leading to acute atrial contractility loss, accompanied by atrioventricular junctional arrhythmia, was diagnosed. We recommend that preoperative risk evaluation be required for multi-risk patients. Likewise, emergent measures should to be established in advance. This case reminds us that atrial pacing can be an optimal management technique once cardiogenic shock has occurred.展开更多
In this study,we present the large photomultiplier tube(PMT)afterpulse measurement results obtained from the Jiangmen underground neutrino observatory(JUNO)experiment.A total of 11 dynode-PMTs(R12860)from the Hamamats...In this study,we present the large photomultiplier tube(PMT)afterpulse measurement results obtained from the Jiangmen underground neutrino observatory(JUNO)experiment.A total of 11 dynode-PMTs(R12860)from the Hamamatsu company(Hamamatsu Photonics K.K.(HPK))and 150 micro-channel plate PMTs(MCP-PMTs,GDB-6201)from the NNVT company(North Night Vision Technology Co.,Ltd.(NNVT))were tested.Subsequently,an afterpulse model was built according to the afterpulse time distribution and the probability of occurrence for these two types of PMTs.The average ratio of the total afterpulse charge with a delay between 0.5μs and 20μs to the primary pulse charge is∼5.7%(13.2%)for the tested MCPPMTs(dynode-PMTs).The JUNO experiment will deploy 20,01220-inch PMTs;this study will benefit detector simulation,event reconstruction,and data analysis regarding the JUNO experiment.展开更多
We theoretically study the differential conductance of a graphene/graphene superconductor junction, where the valley polarization of Dirac electrons is considered in the nonsuperconducting region. It is shown that the...We theoretically study the differential conductance of a graphene/graphene superconductor junction, where the valley polarization of Dirac electrons is considered in the nonsuperconducting region. It is shown that the subgap conductance will increase monotonically with the valley-polarization strength when the chemical potential μ is near the Dirac point μ≤ 3？（？ is the superconducting gap）, whereas it will decrease monotonically when μ is far away from the Dirac point, μ≥ 5？.The former case is induced by the specular Andreev reflection while the retro-reflection accounts for the later result. Our findings may shed light on the control of conductance of a graphene superconductor junction by valley polarization.展开更多
文中聚焦温敏聚合物的响应机理,通过单电子转移活性自由基聚合法(SET-LRP),以溴化亚铜/三-(2-二甲氨基乙基)胺(CuBr/Me_(6)TREN)原位歧化得到的初生零价铜(Cu^(0))及二价铜与混合配体的络合物(Cu^(Ⅱ)Br_(2)/Me_(6)TREN/PMDETA)为催化体...文中聚焦温敏聚合物的响应机理,通过单电子转移活性自由基聚合法(SET-LRP),以溴化亚铜/三-(2-二甲氨基乙基)胺(CuBr/Me_(6)TREN)原位歧化得到的初生零价铜(Cu^(0))及二价铜与混合配体的络合物(Cu^(Ⅱ)Br_(2)/Me_(6)TREN/PMDETA)为催化体系,实现了温敏单体N-异丙基丙烯酰胺(NIPAM)和甜菜碱两性离子功能单体[2-(甲基丙烯酰基氧基)乙基]二甲基-(3-磺酸丙基)氢氧化铵(DMMPPS)的原位链延伸,制备得到了系列不同嵌段比的温敏聚合物P(NIPAM-b-DMMPPS)。采用核磁共振氢谱和红外光谱对聚合物结构进行了表征。以NIPAM加料比例为40%合成的P(NIPAM-b-DMMPPS)具有最低临界溶解温度(LCST)和最高临界溶解温度(UCST),分别为41℃和25℃。考察了NaCl浓度对P(NIPAMb-DMMPPS)LCST的影响,随着NaCl浓度的增大,LCST略降低。表面张力测试结果表明,表面活性聚合物溶液浓度为1×10^(-2)g/L时,表面张力降低至45 m N/m。P(NIPAM-b-DMMPPS)在石蜡/水体系中表现出温度诱导的乳化-破乳行为,P(NIPAM-b-DMMPPS)吸附在油水界面形成乳液,提高P(NIPAM-b-DMMPPS)中PNIPAM嵌段的比例能够实现从“低温乳化、高温破乳”向“高温乳化、低温破乳”的转变,其在油水乳化破乳领域有良好的应用前景。展开更多
Clear aligner treatment is a novel technique in current orthodontic practice.Distinct from traditional fixed orthodontic appliances,clear aligners have different material features and biomechanical characteristics and...Clear aligner treatment is a novel technique in current orthodontic practice.Distinct from traditional fixed orthodontic appliances,clear aligners have different material features and biomechanical characteristics and treatment efficiencies,presenting new clinical challenges.Therefore,a comprehensive and systematic description of the key clinical aspects of clear aligner treatment is essential to enhance treatment efficacy and facilitate the advancement and wide adoption of this new technique.This expert consensus discusses case selection and grading of treatment difficulty,principle of clear aligner therapy,clinical procedures and potential complications,which are crucial to the clinical success of clear aligner treatment.展开更多
基金financially supported by the National Natural Science Foundation of China(U21A20311,U24A2040,52171141,52272117)the Natural Science Foundation of Shandong Province(ZR2022JQ19)+3 种基金the Key Technology Research Project of Shandong Province(2023CXGC010202)the Taishan Industrial Experts Program(TSCX202306142)the Core Facility Sharing Platform of Shandong Universitythe Foundation of Key Laboratory of Advanced Energy Materials Chemistry(Ministry of Education),Nankai University。
文摘Co_(3)S_(4)electrocatalysts with mixed valences of Co ions and excellent structural stability possess favorable oxygen evolution reaction(OER)activity,yet challenges remain in fabricating rechargeable lithiumoxygen batteries(LOBs)due to their poor OER performance,resulting from poor electrical conductivity and overly strong intermediate adsorption.In this work,fancy double heterojunctions on 1T/2H-MoS_(2)@Co_(3)S_(4)(1T/2H-MCS)were constructed derived from the charge donation from Co to Mo ions,thus inducing the phase transformation of Mo S_(2)from 2H to 1T.The unique features of these double heterojunctions endow the1T/2H-MCS with complementary catalysis during charging and discharging processes.It is worth noting that 1T-Mo S2@Co3S4could provide fast Co-S-Mo electron transport channels to promote ORR/OER kinetics,and 2H-MoS_(2)@Co_(3)S_(4)contributed to enabling moderate egorbital occupancy when adsorbed with oxygen-containing intermediates.On the basis,the Li_(2)O_(2)nucleation route was changed to solution and surface dual pathways,improving reversible deposition and decomposition kinetics.As a result,1T/2H-MCS cathodes exhibit an improved electrocatalytic performance compared with those of Co_(3)S_(4)and Mo S2cathodes.This innovative heterostructure design provides a reliable strategy to construct efficient transition metal sulfide catalysts by improving electrical conductivity and modulating adsorption toward oxygenated intermediates for LOBs.
基金supported by the projects of National Virus Resource Center(NVRC-PY-03,E1YZ020501)Natural Science Foundation of Hubei Province(2022CFB564)+4 种基金Foundation of Hubei Provincial Health Commission(WJ2023M108)National Basic Science Data Sharing Platform(no.2018ZX10101004)National Basic Science Data Sharing Service Platform(no.NBSDC-DB-13)the International Cooperation Base of Hubei Province for Infection and Immunitysupported by Outstanding Medical Young Scholars of Hubei Province and Wuhan Young and Middle-aged Medical Backbone Talent Program.
文摘Acute respiratory tract infections(ARTIs)are among the leading causes of morbidity and mortality in children worldwide.Human adenovirus(HAdV)infections are estimated to account for at least 5%of pediatric ARTIs.The circulated genotypes of HAdV and the correlation between genotype and clinical manifestations in Wuhan,China,before and after the complete relaxation of nonpharmaceutical interventions against severe acute respiratory syndrome coronavirus 2,remain unknown.Here,101 HAdV strains were isolated from throat swab samples collected from hospitalized children with ARTIs who tested positive for HAdV nucleic acid.Of these,sixty-six strains from 2022 to twenty-three strains from 2023 were successfully genotyped and subjected to phylogenetic analysis based on the hexon,penton base,and fiber genes.Six genotypes,B3,C1,C2,C5,C104,and C108 were identified.HAdV-B3(84.85%)was the most prevalent type in 2022,while HAdV-C(86.96%),including C1,C2,C108,and C104,was the most prevalent in 2023.These strains were phylogenetically related to strains from Japan,China,and the United States in recent years.When comparing clinical characteristics,pediatric patients infected with B3,C1,C2,C5,C104,or C108 exhibited similar clinical manifestations,primarily fever and cough,but varying interleukin(IL)-10 levels.In conclusion,from June 2022 to September 2023,the circulated genotypes of HAdV in Wuhan included B3,C1,C2,C108,C5,and C104.The endemic pattern of HAdV in Wuhan,China,shifted from species B as the dominant type in 2022 to species C in 2023.
基金supported financially by National Key Research and Development Program of China(No.2023YFB3611400)National Natural Science Foundation of China(Nos.62175026,62305047)+4 种基金China National Postdoctoral Program for Innovative Talents(No.BX20230059)China Postdoctoral Science Foundation(No.2023M740509)Guangdong Basic and Applied Basic Research Foundation(No.2024A1515010005)National Key Laboratory of Intense Pulsed Radiation Simulation and Effect Research Foundation(No.NKLIPR2315)Natural Science Foundation of Sichuan Province(No.24NSFSC1465).
文摘PbSe materials,with their narrow bandgap,excellent optical absorption and outstanding optical response,are ideal for infrared photodetectors,exhibiting unique advantages in optical communication,infrared imaging and thermal detection.Nevertheless,PbSe typically has a non-layered crystal structure and inherent isotropy,making the synthesis of low-dimensional nanomaterials challenging.Besides,PbSe photoconductive detectors suffer from high dark current due to intrinsic defects and thermally excited carriers,which is detrimental to device performance.Here,we utilized physical vapor deposition(PVD)method to grow high-quality PbSe nanosheets and combined them with two-dimensional(2D)transition metal dichalcogenides(TMDs)material WSe_(2)to fabricate a self-powered PbSe/WSe_(2)p-n heterostructure photodetector.Under illumination with a 650 nm laser at a power density of 128.97 mW/cm^(2)and 0 V bias,the PbSe/WSe_(2)heterojunction device exhibited significant photovoltaic characteristics and generated a short-circuit current of 161.7 nA.Furthermore,under 0.02 mW/cm^(2)of 650 nm laser illumination at 0 V bias,the device achieved an excellent responsivity(R)of 15.6 A/W and a specific detectivity(D^(*))of 1.08×10^(11)Jones.And the response speed of the heterojunction device at 0 V(511µs/74µs)was three orders of magnitude faster than that of PbSe nanosheets(93 ms/104 ms).The device also demonstrated broadband detection capabilities from 405 nm to 1550 nm and excellent imaging performance in the near-infrared region at 0 V bias.In summary,the outstanding photoelectric detection performance and imaging capabilities of the PbSe/WSe_(2)heterojunction nanosheet detector indicate its significant potential for applications in miniaturized,low-noise,broadband,high-speed and high-performance photodetectors.
文摘Constructing S-scheme heterojunctions preserves the intrinsic redox capabilities of both semiconductors while promoting the separation of photogenerated electrons and holes,making it a promising approach for enhancing the properties of semiconductors.In this study,an S-scheme Cd_(0.8)Zn_(0.2)S-CeO_(2)(CZS-CeO_(2))heterojunction was successfully fabricated via the in-situ growth of CZS nanowires on CeO_(2)nanocubes.The S-scheme charge-transfer mechanism of the CZS-CeO_(2)composites during photocatalytic reactions was confirmed through in-situ X-ray photoelectron spectroscopy and density functional theory calculations.These results demonstrate that the interfacial electric field(IEF)significantly facilitates charge separation and transport within the heterojunction.Consequently,the CZS-CeO_(2)composites exhibited excellent photocatalytic hydrogen production performance under simulated sunlight irradiation,surpassing that of blank CZS.Particularly,the optimal photocatalytic hydrogen generation rate for CZS-15%CeO_(2)reached 58 mmol·g^(-1)·h^(-1),approximately 8.8 times higher than that of blank CZS.After five consecutive cycles of testing,CZS-15%CeO_(2)retained a relatively high level of activity.This enhanced stability can be attributed to the fabrication of S-scheme heterojunctions,which effectively suppressed hole-induced photocorrosion of CZS.This investigation provides a beneficial reference for the rational design of S-scheme heterojunction photocatalysts for efficient and stable photocatalytic hydrogen production.
基金supported by the National Natural Science Foundation of China(Grant No.12174051)the Fundamental Research Funds for Central Universities。
文摘We investigate the possible Josephson diode effect(JDE)in a two-dimensional(2D)nonmagnetic planar s-wave superconductor junction,which is constructed on a spin-collinear d-wave altermagnet(AM)material in the presence of Rashba spin-orbit interaction.It is demonstrated that the JDE is critically dependent on the crystalline axis of the AM relative to the current direction.The d_(x^(2)-y^(2))magnetization symmetry can support a JDE whereas the dxy symmetry does not facilitate it.The JDE efficiency can reach up to 40%and can be adjusted by an additional asymmetric gate voltage applied to the non-superconducting region of the junction,including control of its polarity.Our findings provide an electrical means to control the JDE within a non-magnetic AM-based superconducting junction.
基金supported by the National Natural Science Foundation of China(NSFC,No.62074048)the Key Research and Development Plan of Anhui Province(No.2022f04020007)the Natural Science Foundation of Anhui Province(No.2208085MF177)。
文摘In this study,we present the fabrication of vertical SnO/β-Ga_(2)O_(3) heterojunction diode(HJD)via radio frequency(RF)reactive magnetron sputtering.The valence and conduction band offsets betweenβ-Ga_(2)O_(3) and SnO are determined to be 2.65and 0.75 eV,respectively,through X-ray photoelectron spectroscopy,showing a type-Ⅱband alignment.Compared to its Schottky barrier diode(SBD)counterpart,the HJD presents a comparable specific ON-resistances(R_(on,sp))of 2.8 mΩ·cm^(2) and lower reverse leakage current(I_R),leading to an enhanced reverse blocking characteristics with breakdown voltage(BV)of 1675 V and power figure of merit(PFOM)of 1.0 GW/cm~2.This demonstrates the high quality of the SnO/β-Ga_(2)O_(3) heterojunction interface.Silvaco TCAD simulation further reveals that electric field crowding at the edge of anode for the SBD was greatly depressed by the introduction of SnO film,revealing the potential application of SnO/β-Ga_(2)O_(3) heterojunction in the futureβ-Ga_(2)O_(3)-based power devices.data mining,AI training,and similar technologies,are reserved.
基金financially supported by the National Key Research and Development Program of China (No. 2022YFC2105300)。
文摘A series of leaching and electrochemical experiments were conducted to elucidate the critical role of hydrogen sulfide(H_(2)S)in copper-driven reduction of chalcopyrite.Results demonstrate that in the absence of H_(2)S,metallic copper converts chalcopyrite into bornite(Cu_(5)FeS_(4)).However,the introduction of H_(2)S promotes the formation of chalcocite(Cu_(2)S)by altering the oxidation pathway of copper.Electrochemical analysis demonstrates that the presence of H₂S significantly reduces the corrosion potential of copper from 0.251 to−0.223 V(vs SHE),reaching the threshold necessary for the formation of Cu_(2)S.Nevertheless,excessive H_(2)S triggers sulfate reduction via the reaction of 8Cu+H_(2)SO_(4)+3H_(2)S=4Cu_(2)S+4H_(2)O(ΔG=−519.429 kJ/mol at 50℃),leading to inefficient copper utilization.
基金Project supported by National Science Funds for Creative Research Groups of China(Grant No.61421002)
文摘High-performance photodetectors are expected to open up revolutionary opportunities in many application fields, such as environment monitoring, military, optical communication and biomedical science. Combining two-dimensional materials(which have tunable optical absorption and high carrier mobility) with organic materials(which are abundant with low cost, high flexibility and large-area scalability) to form thin-film heterojunctions, high-responsivity photodetectors could be predicted with fast response speed in a wide spectra region.In this review, we give a comprehensive summary of photodetectors based on two-dimensional materials and organic thin-film heterojunctions, which includes hybrid assisted enhanced devices, single-layer enhanced devices, vertical heterojunction devices and tunable vertical heterojunction devices. We also give a systematic classification and perspectives on the future development of these types of photodetectors.
基金Supported by Key Program for Science and Technology Research from the Education Department of Henan Province(13B230336)
文摘[ Objective] This study aimed to investigate the effects of crude extract of Poria cocos on intestinal smooth muscle contraction of rabbits in vitro and re- veal the related mechanism. [Method] With in vitro experimental method, using the tension of jejunal and cecal smooth muscle as an indicator, 3.75, 7.50, 15.00, and 22.5 g/L crude extract of P. cocos were added into Tyrede＇s solution of jejunum and cecum tissues of rabbits to observe the effects of crude extract of P. cocos on motion dynamics of jejunum and cecum of rabbits. [ Result] The addition of crude extract of P. cocos could inhibit the contraction of jejunal and cecal smooth muscle of rabbits in vitro, enhance contraction tension and relaxation tension, and reduce contraction amplitude. The effects were improved as the dose of crude extract of P. cocos increased, displaying a dose-effect relationship. [Condusion] This study provided theoretical basis for the clinical use of P. cocos.
基金supported by the National Natural Science Foundation of China (No. 11675273)the Strategic Priority Research Program of the Chinese Academy of Sciences (No. XDA10011102)
文摘A database system,known as the large PMT characterization and instrumentation database system(LPMT-CIDS),was designed and implemented for the Jiangmen Underground Neutrino Observatory(JUNO).The system is based on a Linux+Apache+MySQL+PHP(LAMP)server and focuses on modularization and architecture separation.It covers all the testing stages for the 20-inch photomultiplier tubes(PMTs)at JUNO and provides its users with data storage,analysis,and visualization services.Based on the successful use of the system in the 20-inch PMT testing program,its design approach and construction elements can be extended to other projects.
文摘An 82-year-old female patient undergoing cardiogenic shock caused by atrioventficular junctional rhythm immediately after percutaneous coronary intervention （PCI） is described. Pharmacotherapy was invalid, and subsequent application of atrial pacing reversed the cardiogenic shock. PCI-related injury of sinuatrial nodal artery leading to acute atrial contractility loss, accompanied by atrioventricular junctional arrhythmia, was diagnosed. We recommend that preoperative risk evaluation be required for multi-risk patients. Likewise, emergent measures should to be established in advance. This case reminds us that atrial pacing can be an optimal management technique once cardiogenic shock has occurred.
基金supported by Strategic Priority Research Program of the Chinese Academy of Sciences (No. XDA10011100),Joint Institute of Nuclear Research (JINR),Russia and Lomonosov Moscow State University in Russia,joint Russian Science Foundation (RSF),DFG (Deutsche Forschungsgemeinschaft)National Natural Science Foundation of China (Nos. 12090062 and 12075087)
文摘In this study,we present the large photomultiplier tube(PMT)afterpulse measurement results obtained from the Jiangmen underground neutrino observatory(JUNO)experiment.A total of 11 dynode-PMTs(R12860)from the Hamamatsu company(Hamamatsu Photonics K.K.(HPK))and 150 micro-channel plate PMTs(MCP-PMTs,GDB-6201)from the NNVT company(North Night Vision Technology Co.,Ltd.(NNVT))were tested.Subsequently,an afterpulse model was built according to the afterpulse time distribution and the probability of occurrence for these two types of PMTs.The average ratio of the total afterpulse charge with a delay between 0.5μs and 20μs to the primary pulse charge is∼5.7%(13.2%)for the tested MCPPMTs(dynode-PMTs).The JUNO experiment will deploy 20,01220-inch PMTs;this study will benefit detector simulation,event reconstruction,and data analysis regarding the JUNO experiment.
基金Project supported by the National Natural Science Foundation of China(Grant Nos.11274059 and 11074233)
文摘We theoretically study the differential conductance of a graphene/graphene superconductor junction, where the valley polarization of Dirac electrons is considered in the nonsuperconducting region. It is shown that the subgap conductance will increase monotonically with the valley-polarization strength when the chemical potential μ is near the Dirac point μ≤ 3？（？ is the superconducting gap）, whereas it will decrease monotonically when μ is far away from the Dirac point, μ≥ 5？.The former case is induced by the specular Andreev reflection while the retro-reflection accounts for the later result. Our findings may shed light on the control of conductance of a graphene superconductor junction by valley polarization.
文摘文中聚焦温敏聚合物的响应机理,通过单电子转移活性自由基聚合法(SET-LRP),以溴化亚铜/三-(2-二甲氨基乙基)胺(CuBr/Me_(6)TREN)原位歧化得到的初生零价铜(Cu^(0))及二价铜与混合配体的络合物(Cu^(Ⅱ)Br_(2)/Me_(6)TREN/PMDETA)为催化体系,实现了温敏单体N-异丙基丙烯酰胺(NIPAM)和甜菜碱两性离子功能单体[2-(甲基丙烯酰基氧基)乙基]二甲基-(3-磺酸丙基)氢氧化铵(DMMPPS)的原位链延伸,制备得到了系列不同嵌段比的温敏聚合物P(NIPAM-b-DMMPPS)。采用核磁共振氢谱和红外光谱对聚合物结构进行了表征。以NIPAM加料比例为40%合成的P(NIPAM-b-DMMPPS)具有最低临界溶解温度(LCST)和最高临界溶解温度(UCST),分别为41℃和25℃。考察了NaCl浓度对P(NIPAMb-DMMPPS)LCST的影响,随着NaCl浓度的增大,LCST略降低。表面张力测试结果表明,表面活性聚合物溶液浓度为1×10^(-2)g/L时,表面张力降低至45 m N/m。P(NIPAM-b-DMMPPS)在石蜡/水体系中表现出温度诱导的乳化-破乳行为,P(NIPAM-b-DMMPPS)吸附在油水界面形成乳液,提高P(NIPAM-b-DMMPPS)中PNIPAM嵌段的比例能够实现从“低温乳化、高温破乳”向“高温乳化、低温破乳”的转变,其在油水乳化破乳领域有良好的应用前景。
文摘Clear aligner treatment is a novel technique in current orthodontic practice.Distinct from traditional fixed orthodontic appliances,clear aligners have different material features and biomechanical characteristics and treatment efficiencies,presenting new clinical challenges.Therefore,a comprehensive and systematic description of the key clinical aspects of clear aligner treatment is essential to enhance treatment efficacy and facilitate the advancement and wide adoption of this new technique.This expert consensus discusses case selection and grading of treatment difficulty,principle of clear aligner therapy,clinical procedures and potential complications,which are crucial to the clinical success of clear aligner treatment.
