The stimuli-responsive anticorrosion coatings have drawn great attention as a prospective corrosion protection approach due to their smart self-repairing properties.In contrast to passive protection mechanism based on...The stimuli-responsive anticorrosion coatings have drawn great attention as a prospective corrosion protection approach due to their smart self-repairing properties.In contrast to passive protection mechanism based on post-corrosion microenvironmental changes,a unique active protection strategy based on nanocatalytic oxygen depletion is proposed in this work to inhibit the occurrence of corrosion.Porous FeeNeC catalysts with outstanding oxygen reduction reaction(ORR)activity(half-wave potential of 0.89 V)is firstly synthesized through pre-coordination with organosilane precursor to obtain homogeneously distributed active sites.When this catalyst is introduced into the coating matrix,uniformly distributed FeeNeC not only compensates the defects but plays a crucial role in adsorption and consumption of diffused oxygen in the coating.Under this dual action,the penetration of corrosive medium,especially oxygen,through coating to metal substrate is greatly suppressed,resulting in effective corrosion inhibition and a significant increase in corrosion resistance of the composite coating compared to pure epoxy coating.This work provides a new perspective and the starting point for the design of high-performance smart coating with active anticorrosion properties.展开更多
A foil–microchannel plate(MCP)detector,which uses electrostatic lenses and possesses both good position and timing resolutions,has been designed and simulated for beam diagnostics and mass measurements at the next-ge...A foil–microchannel plate(MCP)detector,which uses electrostatic lenses and possesses both good position and timing resolutions,has been designed and simulated for beam diagnostics and mass measurements at the next-generation heavy-ion-beam facility HIAF in China.Characterized by low energy loss and good performances of timing and position measurements,it would be located at focal planes in fragment separator HFRS for position monitoring,beam turning,Bq measurement,and trajectory reconstruction.Moreover,it will benefit the building-up of a magnetic-rigidity–energy-loss–time-offlight(BqDETOF)method at HFRS for high-precision in-flight particle identification of radioactive isotope beams on an event-by-event basis.Most importantly,the detector can be utilized for in-ring TOF and position measurements,beam-line TOF measurements at two achromatic foci,and position measurements at a dispersive focus of HFRS,thus making it possible to use two complementary mass measurement methods[isochronous mass spectrometry at the storage ring SRing and magnetic-rigidity–time-of-flight(BqTOF)at the beam-line HFRS]in one single experimental run.展开更多
A type of calcium coke was developed for use in the oxy-thermal process of calcium carbide production.The calcium coke was prepared by the co-pyrolysis of coking coal and calcium carbide slag, which is a solid waste g...A type of calcium coke was developed for use in the oxy-thermal process of calcium carbide production.The calcium coke was prepared by the co-pyrolysis of coking coal and calcium carbide slag, which is a solid waste generated from the chlor-alkali industry.The characteristics of the calcium cokes under different conditions were analyzed experimentally and theoretically.The results show that the thermal strength of calcium coke increased with the increase in the coking coal proportion, and the waterproof property of calcium coke also increased with increased carbonation time.The calcium coke can increase the contact area of calcium and carbon in the calcium carbide production process.Furthermore, the pore structure of the calcium coke can enhance the diffusion of gas inside the furnace, thus improving the efficiency of the oxy-thermal technology.展开更多
We investigate the quantum entanglement in a double-cavity optomechanical system consisting of an optomechanical cavity and an auxiliary cavity,where the optomechanical cavity mode couples with the mechanical mode via...We investigate the quantum entanglement in a double-cavity optomechanical system consisting of an optomechanical cavity and an auxiliary cavity,where the optomechanical cavity mode couples with the mechanical mode via radiation-pressure interaction,and simultaneously couples with the auxiliary cavity mode via nonreciprocal coupling.We study the entanglement between the mechanical oscillator and the cavity modes when the two cavities are reciprocally or non-reciprocally coupled.The logarithmic negativity E_(n)^((1))(E_(n)^((2)))is adopted to describe the entanglement degree between the mechanical mode and the optomechanical cavity mode(the auxiliary cavity mode).We find that both E_(n)^((1))and E_(n)^((2))have maximum values in the case of reciprocal coupling.By using nonreciprocal coupling,E_(n)^((1))and E_(n)^((2))can exceed those maximum values,and a wider detuning region where the entanglement exists can be obtained.Moreover,the entanglement robustness with respect to the environment temperature is also effectively enhanced.展开更多
We propose a novel scheme for generating the entanglement of two oscillating mirrors in an optomechanical system via a flying atom. In this scheme, a two-level atom, in an arbitrary superposition state, passes through...We propose a novel scheme for generating the entanglement of two oscillating mirrors in an optomechanical system via a flying atom. In this scheme, a two-level atom, in an arbitrary superposition state, passes through an optomechanical system with two oscillating cavity-mirrors, and then its states are detected. In this way, we can generate the entangled states of the two oscillating mirrors. We derive the analytical expressions of the entangled states and make numerical calculations. We find that the entanglement of the two oscillating mirrors can be controlled by the initial state of the atom, the optomechanical coupling strength, and the coupling strength between the atom and the cavity field. We investigate the dynamics of the system with dissipations and discuss the experimental feasibility.展开更多
Fine motor skills are thought to rely on the integrity of ascending sensory pathways in the spinal dorsal column as well as descending motor pathways that have a neocortical origin.However, the neurophysiological proc...Fine motor skills are thought to rely on the integrity of ascending sensory pathways in the spinal dorsal column as well as descending motor pathways that have a neocortical origin.However, the neurophysiological processes underlying communication between the somatosensory and motor pathways that regulate fine motor skills during spontaneous recovery after spinal cord contusion injury remain unclear.Here, we established a rat model of cervical hemicontusive injury using C5 laminectomy followed by contusional displacement of 1.2 mm(mild injury) or 2.0 mm(severe injury) to the C5 spinal cord.Electrophysiological recordings were performed on the brachial muscles up to 12 weeks after injury to investigate the mechanisms by which spinal cord pathways participate in motor function.After spinal cord contusion injury, the amplitudes of somatosensory and motor-evoked potentials were reduced, and the latencies were increased.The forelimb open field locomotion test, grooming test, rearing test and Montoya staircase test revealed improvement in functions.With increasing time after injury, the amplitudes of somatosensory and motor-evoked potentials in rats with mild spinal cord injury increased gradually, and the latencies gradually shortened.In comparison, the recovery times of somatosensory and motor-evoked potential amplitudes and latencies were longer, and the recovery of motor function was delayed in rats with severe spinal cord injury.Correlation analysis revealed that somatosensoryevoked potential and motor-evoked potential parameters were correlated with gross and fine motor function in rats with mild spinal cord contusion injury.In contrast, only somatosensory-evoked potential amplitude was correlated with fine motor skills in rats with severe spinal cord injury.Our results show that changes in both somatosensory and motor-evoked potentials can reflect the changes in gross and fine motor functions after mild spinal cord contusion injury, and that the change in somatosensory-evoked potential amplitude can also reflect the change in fine motor function after severe spinal cord contusion injury.This study was approved by the Animal Ethics Committee of Nanfang Hospital, Southern Medical University, China(approval No.NFYY-2017-67) on June 11, 2017.展开更多
We theoretically study the optical nonreciprocity in a piezo-optomechanical microdisk resonator,in which the cavity modes and the mechanical mode are optically pumped and piezoelectrically driven,respectively.For asym...We theoretically study the optical nonreciprocity in a piezo-optomechanical microdisk resonator,in which the cavity modes and the mechanical mode are optically pumped and piezoelectrically driven,respectively.For asymmetric optical pumping and different piezoelectrical drivings,our system shows some nonreciprocal optical responses.We find that our system can function as an optical isolator,a nonreciprocal amplifier,or a nonreciprocal phase shifter.展开更多
BACKGROUND Three-vessel disease(TVD)with a SYNergy between PCI with TAXus and cardiac surgery(SYNTAX)score of≥23 is one of the most severe types of coronary artery disease.We aimed to take advantage of machine learni...BACKGROUND Three-vessel disease(TVD)with a SYNergy between PCI with TAXus and cardiac surgery(SYNTAX)score of≥23 is one of the most severe types of coronary artery disease.We aimed to take advantage of machine learning to help in de-cision-making and prognostic evaluation in such patients.METHODS We analyzed 3786 patients who had TVD with a SYNTAX score of≥23,had no history of previous revascularization,and underwent either coronary artery bypass grafting(CABG)or percutaneous coronary intervention(PCI)after enrollment.The patients were randomly assigned to a training group and testing group.The C4.5 decision tree algorithm was applied in the training group,and all-cause death after a median follow-up of 6.6 years was regarded as the class label.RESULTS The decision tree algorithm selected age and left ventricular end-diastolic diameter(LVEDD)as splitting features and divided the patients into three subgroups:subgroup 1(age of≤67 years and LVEDD of≤53 mm),subgroup 2(age of≤67 years and LVEDD of>53 mm),and subgroup 3(age of>67 years).PCI conferred a patient survival benefit over CABG in sub-group 2.There was no significant difference in the risk of all-cause death between PCI and CABG in subgroup 1 and subgroup 3 in both the training data and testing data.Among the total study population,the multivariable analysis revealed significant dif-ferences in the risk of all-cause death among patients in three subgroups.CONCLUSIONS The combination of age and LVEDD identified by machine learning can contribute to decision-making and risk assessment of death in patients with severe TVD.The present results suggest that PCI is a better choice for young patients with severe TVD characterized by left ventricular dilation.展开更多
We study the quadrature squeezing and entanglement in a cavity optomechanical system (COMS). In our model, a flying atom sequentially passes through and interacts with the COMS and a Ramsey pulse zone, and subsequentl...We study the quadrature squeezing and entanglement in a cavity optomechanical system (COMS). In our model, a flying atom sequentially passes through and interacts with the COMS and a Ramsey pulse zone, and subsequently the atomic state is detected. In this way, the photon-phonon squeezing and entanglement can be generated. The dynamic evolution of the squeezing and entanglement in the presence of losses are examined by using the master equation method.展开更多
In 2023,Antarctica experienced its lowest sea ice extent in the satellite era,with extreme polar events gaining widespread attention.Prydz Bay,where the Chinese Zhongshan Station is located,is the third largest embaym...In 2023,Antarctica experienced its lowest sea ice extent in the satellite era,with extreme polar events gaining widespread attention.Prydz Bay,where the Chinese Zhongshan Station is located,is the third largest embayment in Antarctica.Changes in sea ice,fast ice and polynyas directly affect local heat and mass exchanges between the ocean and atmosphere,as well as ecosystems and research activities.In 2023,substantial fast ice anomalies were observed in Prydz Bay:the extent of fast ice off Zhongshan Station(ZSFI)was anomalously low,while that within Barrier Bay(BaFI)was anomalously high.This study analysed the seasonal evolution and underlying main causes for the extreme conditions using ice charts,satellites and reanalysis data.From 2014 to 2022,the extent of zSFI typically increased during the cold season,reaching a maximum of(9.41±2.47)×10^(3) km^(2),whilst the Barrier Bay Polynya(BaP)persisted throughout this period.However,in 2023,ZSFI did not increase from June onwards,peaking at a maximum extent of only 5.49×10^(3) km^(2),and the BaP closed in mid-winter,leading to the formation of extensive BaFI.Air temperature and wind speed continuously dropped in July,and these conditions persisted for approximately 1 month,leading to the closure of BaP.However,zSFI did not expand further under these extreme meteorological conditions,indicating its independence from these factors.The limited expansion of ZSFI could be attributed to high ocean temperatures.Overall,this study provides valuable insights into the mechanisms driving extreme fast ice conditions.展开更多
基金financially supported by the“National Natural Science Foundation of China”(52304072)“Funded by Shandong Postdoctora1 Science Foundation”(SDBX2023019)+1 种基金the“Fundamental Research Funds for the Central Universities”(23CX06022A)the“Applied Research Project of Qingdao Postdoctoral Researchers”(QDBSH20230202010).
文摘The stimuli-responsive anticorrosion coatings have drawn great attention as a prospective corrosion protection approach due to their smart self-repairing properties.In contrast to passive protection mechanism based on post-corrosion microenvironmental changes,a unique active protection strategy based on nanocatalytic oxygen depletion is proposed in this work to inhibit the occurrence of corrosion.Porous FeeNeC catalysts with outstanding oxygen reduction reaction(ORR)activity(half-wave potential of 0.89 V)is firstly synthesized through pre-coordination with organosilane precursor to obtain homogeneously distributed active sites.When this catalyst is introduced into the coating matrix,uniformly distributed FeeNeC not only compensates the defects but plays a crucial role in adsorption and consumption of diffused oxygen in the coating.Under this dual action,the penetration of corrosive medium,especially oxygen,through coating to metal substrate is greatly suppressed,resulting in effective corrosion inhibition and a significant increase in corrosion resistance of the composite coating compared to pure epoxy coating.This work provides a new perspective and the starting point for the design of high-performance smart coating with active anticorrosion properties.
基金supported by the National Natural Science Foundation of China(Nos.11605248,11605249,11605267,and 11805032.)
文摘A foil–microchannel plate(MCP)detector,which uses electrostatic lenses and possesses both good position and timing resolutions,has been designed and simulated for beam diagnostics and mass measurements at the next-generation heavy-ion-beam facility HIAF in China.Characterized by low energy loss and good performances of timing and position measurements,it would be located at focal planes in fragment separator HFRS for position monitoring,beam turning,Bq measurement,and trajectory reconstruction.Moreover,it will benefit the building-up of a magnetic-rigidity–energy-loss–time-offlight(BqDETOF)method at HFRS for high-precision in-flight particle identification of radioactive isotope beams on an event-by-event basis.Most importantly,the detector can be utilized for in-ring TOF and position measurements,beam-line TOF measurements at two achromatic foci,and position measurements at a dispersive focus of HFRS,thus making it possible to use two complementary mass measurement methods[isochronous mass spectrometry at the storage ring SRing and magnetic-rigidity–time-of-flight(BqTOF)at the beam-line HFRS]in one single experimental run.
基金financially supported by the Natural Science Foundation of China (Nos.U1610101 and 21776288)the Green Process Manufacturing Innovation Research Institute, Chinese Academy of Sciences (No.IAGM-2019-A09)the funding support from Vinnova (Dn: 2018-05293)。
文摘A type of calcium coke was developed for use in the oxy-thermal process of calcium carbide production.The calcium coke was prepared by the co-pyrolysis of coking coal and calcium carbide slag, which is a solid waste generated from the chlor-alkali industry.The characteristics of the calcium cokes under different conditions were analyzed experimentally and theoretically.The results show that the thermal strength of calcium coke increased with the increase in the coking coal proportion, and the waterproof property of calcium coke also increased with increased carbonation time.The calcium coke can increase the contact area of calcium and carbon in the calcium carbide production process.Furthermore, the pore structure of the calcium coke can enhance the diffusion of gas inside the furnace, thus improving the efficiency of the oxy-thermal technology.
基金Project supported by the National Natural Science Foundation of China(Grant Nos.12047520,61941501,61775062,11574092,61378012,91121023,62071186 and 61771205).
文摘We investigate the quantum entanglement in a double-cavity optomechanical system consisting of an optomechanical cavity and an auxiliary cavity,where the optomechanical cavity mode couples with the mechanical mode via radiation-pressure interaction,and simultaneously couples with the auxiliary cavity mode via nonreciprocal coupling.We study the entanglement between the mechanical oscillator and the cavity modes when the two cavities are reciprocally or non-reciprocally coupled.The logarithmic negativity E_(n)^((1))(E_(n)^((2)))is adopted to describe the entanglement degree between the mechanical mode and the optomechanical cavity mode(the auxiliary cavity mode).We find that both E_(n)^((1))and E_(n)^((2))have maximum values in the case of reciprocal coupling.By using nonreciprocal coupling,E_(n)^((1))and E_(n)^((2))can exceed those maximum values,and a wider detuning region where the entanglement exists can be obtained.Moreover,the entanglement robustness with respect to the environment temperature is also effectively enhanced.
基金Project supported by the National Natural Science Foundation of China(Grant Nos.11574092,61775062,61378012,91121023,and 60978009)the National Basic Research Program of China(Grant No.2013CB921804)
文摘We propose a novel scheme for generating the entanglement of two oscillating mirrors in an optomechanical system via a flying atom. In this scheme, a two-level atom, in an arbitrary superposition state, passes through an optomechanical system with two oscillating cavity-mirrors, and then its states are detected. In this way, we can generate the entangled states of the two oscillating mirrors. We derive the analytical expressions of the entangled states and make numerical calculations. We find that the entanglement of the two oscillating mirrors can be controlled by the initial state of the atom, the optomechanical coupling strength, and the coupling strength between the atom and the cavity field. We investigate the dynamics of the system with dissipations and discuss the experimental feasibility.
基金supported by the National Natural Science Foundation of China, No.81871768(to YH)Chinese Academy of Medical Sciences Initiative for Innovative Medicine of China, No.2016-I2 M-2-006(to HYC)High Level-Hospital Program, Health Commission of Guangdong Province, China, No.HKUSZH201902011(to YH)。
文摘Fine motor skills are thought to rely on the integrity of ascending sensory pathways in the spinal dorsal column as well as descending motor pathways that have a neocortical origin.However, the neurophysiological processes underlying communication between the somatosensory and motor pathways that regulate fine motor skills during spontaneous recovery after spinal cord contusion injury remain unclear.Here, we established a rat model of cervical hemicontusive injury using C5 laminectomy followed by contusional displacement of 1.2 mm(mild injury) or 2.0 mm(severe injury) to the C5 spinal cord.Electrophysiological recordings were performed on the brachial muscles up to 12 weeks after injury to investigate the mechanisms by which spinal cord pathways participate in motor function.After spinal cord contusion injury, the amplitudes of somatosensory and motor-evoked potentials were reduced, and the latencies were increased.The forelimb open field locomotion test, grooming test, rearing test and Montoya staircase test revealed improvement in functions.With increasing time after injury, the amplitudes of somatosensory and motor-evoked potentials in rats with mild spinal cord injury increased gradually, and the latencies gradually shortened.In comparison, the recovery times of somatosensory and motor-evoked potential amplitudes and latencies were longer, and the recovery of motor function was delayed in rats with severe spinal cord injury.Correlation analysis revealed that somatosensoryevoked potential and motor-evoked potential parameters were correlated with gross and fine motor function in rats with mild spinal cord contusion injury.In contrast, only somatosensory-evoked potential amplitude was correlated with fine motor skills in rats with severe spinal cord injury.Our results show that changes in both somatosensory and motor-evoked potentials can reflect the changes in gross and fine motor functions after mild spinal cord contusion injury, and that the change in somatosensory-evoked potential amplitude can also reflect the change in fine motor function after severe spinal cord contusion injury.This study was approved by the Animal Ethics Committee of Nanfang Hospital, Southern Medical University, China(approval No.NFYY-2017-67) on June 11, 2017.
基金Project supported by the National Natural Science Foundation of China(Grant Nos.61941501,61775062,11574092,61378012,and 91121023)the Doctoral Program of Guangdong Natural Science Foundation,China(Grant No.2018A030310109)+1 种基金the Doctoral Project of Guangdong Medical University,China(Grant No.B2017019)the Open Project of the Key Laboratory of Low Dimensional Quantum Structures and Quantum Control of the Ministry of Education,Hunan Normal University,China(Grant No.QSQC1808).
文摘We theoretically study the optical nonreciprocity in a piezo-optomechanical microdisk resonator,in which the cavity modes and the mechanical mode are optically pumped and piezoelectrically driven,respectively.For asymmetric optical pumping and different piezoelectrical drivings,our system shows some nonreciprocal optical responses.We find that our system can function as an optical isolator,a nonreciprocal amplifier,or a nonreciprocal phase shifter.
基金This work was supported by the CAMS Innovation Fund for Medical Sciences(grant number 2016-I2M-1-002)the Beijing Municipal Natural Science Foundation(grant number 7181008)Capital’s Funds for Health Improvement and Research(grant number 2018-2-4033).
文摘BACKGROUND Three-vessel disease(TVD)with a SYNergy between PCI with TAXus and cardiac surgery(SYNTAX)score of≥23 is one of the most severe types of coronary artery disease.We aimed to take advantage of machine learning to help in de-cision-making and prognostic evaluation in such patients.METHODS We analyzed 3786 patients who had TVD with a SYNTAX score of≥23,had no history of previous revascularization,and underwent either coronary artery bypass grafting(CABG)or percutaneous coronary intervention(PCI)after enrollment.The patients were randomly assigned to a training group and testing group.The C4.5 decision tree algorithm was applied in the training group,and all-cause death after a median follow-up of 6.6 years was regarded as the class label.RESULTS The decision tree algorithm selected age and left ventricular end-diastolic diameter(LVEDD)as splitting features and divided the patients into three subgroups:subgroup 1(age of≤67 years and LVEDD of≤53 mm),subgroup 2(age of≤67 years and LVEDD of>53 mm),and subgroup 3(age of>67 years).PCI conferred a patient survival benefit over CABG in sub-group 2.There was no significant difference in the risk of all-cause death between PCI and CABG in subgroup 1 and subgroup 3 in both the training data and testing data.Among the total study population,the multivariable analysis revealed significant dif-ferences in the risk of all-cause death among patients in three subgroups.CONCLUSIONS The combination of age and LVEDD identified by machine learning can contribute to decision-making and risk assessment of death in patients with severe TVD.The present results suggest that PCI is a better choice for young patients with severe TVD characterized by left ventricular dilation.
基金supported by the National Natural Science Foundation of China (Grant Nos. 11574092,61775062, 61378012, and 91121023)the National Basic Research Program of China (Grant No. 2013CB921804)the Innovation Project of Graduate School of South China Normal University (Grant No. 2017LKXM020).
文摘We study the quadrature squeezing and entanglement in a cavity optomechanical system (COMS). In our model, a flying atom sequentially passes through and interacts with the COMS and a Ramsey pulse zone, and subsequently the atomic state is detected. In this way, the photon-phonon squeezing and entanglement can be generated. The dynamic evolution of the squeezing and entanglement in the presence of losses are examined by using the master equation method.
基金supported by the National Natural Science Foundation of China(41925027,42206248).
文摘In 2023,Antarctica experienced its lowest sea ice extent in the satellite era,with extreme polar events gaining widespread attention.Prydz Bay,where the Chinese Zhongshan Station is located,is the third largest embayment in Antarctica.Changes in sea ice,fast ice and polynyas directly affect local heat and mass exchanges between the ocean and atmosphere,as well as ecosystems and research activities.In 2023,substantial fast ice anomalies were observed in Prydz Bay:the extent of fast ice off Zhongshan Station(ZSFI)was anomalously low,while that within Barrier Bay(BaFI)was anomalously high.This study analysed the seasonal evolution and underlying main causes for the extreme conditions using ice charts,satellites and reanalysis data.From 2014 to 2022,the extent of zSFI typically increased during the cold season,reaching a maximum of(9.41±2.47)×10^(3) km^(2),whilst the Barrier Bay Polynya(BaP)persisted throughout this period.However,in 2023,ZSFI did not increase from June onwards,peaking at a maximum extent of only 5.49×10^(3) km^(2),and the BaP closed in mid-winter,leading to the formation of extensive BaFI.Air temperature and wind speed continuously dropped in July,and these conditions persisted for approximately 1 month,leading to the closure of BaP.However,zSFI did not expand further under these extreme meteorological conditions,indicating its independence from these factors.The limited expansion of ZSFI could be attributed to high ocean temperatures.Overall,this study provides valuable insights into the mechanisms driving extreme fast ice conditions.
