In order to theoretically study the buckle propagation of subsea pipelines with slip-on buckle arrestors, a two-dimensional ring model was set up to represent the pipeline and a nonlinear spring model was adopted to s...In order to theoretically study the buckle propagation of subsea pipelines with slip-on buckle arrestors, a two-dimensional ring model was set up to represent the pipeline and a nonlinear spring model was adopted to simulate the contact between pipeline's inner walls and between pipeline's outer wall and slip-on buckle arrestor's inner wall during buckle propagation. In addition, some reverse springs are added to prevent the wall of left and right sides separating from the inner wall of slip-on buckle arrestors. Considering large deformation kinematics relations and the elastic-plastic constitutive relation of material, balance equations were established with the principle of virtual work. The variation of external pressure with respect to the cross-sectional area of pipelines was analyzed, and the lower bound of the crossover pressure of slip-on buckle arrestors was calculated based on Maxwell's energy balance method. By comparing the theoretical results with experiment and finite element numerical simulation, the theoretical method is proved to be correct and reliable.展开更多
Nanopores and nanochannels produced by etching heavy ion tracks are widely used in contemporary science and technology[1]. Conical and doubly-conical nanopores (channels) have attracted special interest in the past de...Nanopores and nanochannels produced by etching heavy ion tracks are widely used in contemporary science and technology[1]. Conical and doubly-conical nanopores (channels) have attracted special interest in the past decade due to their potential in modern and rapidly growing fields, including molecular sensors, logic gates, nanoactuators, and other nanofluidic devices[2;3].展开更多
PRESTAGE is a Monte Carlo simulation code which calculates proton single event effect cross sections from heavy ion test data. It can accurately predict not only single event upsets induced by proton indirect ionizati...PRESTAGE is a Monte Carlo simulation code which calculates proton single event effect cross sections from heavy ion test data. It can accurately predict not only single event upsets induced by proton indirect ionization,but also single event latch-ups and proton direct ionization effects[1]. However, in practical applications some of the input parameters are difficult to obtain. For instance, the thickness of the sensitive volume is closely related to the topology, doping concentration, and other device parameters. Device suppliers are generally reluctant to disclose such information due to the consideration of intellectual property protection. Therefore, examining the sensitivity to the input parameters is important to the usage of the PRESTAGE method.展开更多
Space radiation environments in which satellites and spacecraft are flying contain a large amount of high-energy protons. These protons could induce single event effects in semi-conductor devices and severely destroy ...Space radiation environments in which satellites and spacecraft are flying contain a large amount of high-energy protons. These protons could induce single event effects in semi-conductor devices and severely destroy the operational reliability of the device. Therefore, estimating proton single event effect cross-sections and calculating error rates in space for the spaceflight devices are vital to the safety guarantee of the satellite in orbit[1]. Nowadays, the most commonly used theoretical methods of predicting proton single event effect cross-sections give inaccurate predictions in many circumstances[2].展开更多
Because single track is the elementary building block for nanoporous membrane, the understanding and controlling of their individual properties should be crucial in ion separation, ion filtration, and bio-molecule det...Because single track is the elementary building block for nanoporous membrane, the understanding and controlling of their individual properties should be crucial in ion separation, ion filtration, and bio-molecule detection using arrays of identical nanopores[1;2]. Here, by irradiating the graphene/PET sample with single ion, the single suspended graphene nanopore can be obtained after chemical etching of irradiated PET membrane[3].展开更多
VATA160 is a low-noise, low-power commercial Application Specific Integrated Circuit (ASIC) chip designed by IDEAS (Norway). It is a core device in the electronics system of the sub-detectors on the scientific satelli...VATA160 is a low-noise, low-power commercial Application Specific Integrated Circuit (ASIC) chip designed by IDEAS (Norway). It is a core device in the electronics system of the sub-detectors on the scientific satellite Dark Matter Particle Explorer (DAMPE)[1]. During its service period, DAMPE will encounter energetic and high flux protons from the space radiation environments.展开更多
Enhancing the thermal stability of separator is the main strategy for improving the safety of lithium-ion batteries(LIBs)against thermal runaway.We successfully developed a roll-to-roll process to fabricate a COF(cova...Enhancing the thermal stability of separator is the main strategy for improving the safety of lithium-ion batteries(LIBs)against thermal runaway.We successfully developed a roll-to-roll process to fabricate a COF(covalent organic framework)-modi ed polyimide(PI)ion track-etched separator by combining heavy ion track etching and doctor blade coating to achieve highly safe LIBs(Fig.1).展开更多
This work is mainly to study the effect of heavy ion irradiation on the damage of single layer MoS2.The number of layers of MoS2 prepared by CVD(chemical vapor deposition)method was determined by optical microscopy an...This work is mainly to study the effect of heavy ion irradiation on the damage of single layer MoS2.The number of layers of MoS2 prepared by CVD(chemical vapor deposition)method was determined by optical microscopy and Raman spectroscopy.The monolayer MoS2 prepared by CVD under high energy 209Bi ion irradiation was analyzed by Raman analysis and AFM observation.And the results are compared and analyzed before and after the beam irradiation of single layer MoS2 prepared by mechanical stripping method.展开更多
The main work of the irradiation technique group focuses on the following two aspects in 2016:1.Technique support We have had about 772.5 h beam time for 39 rounds of single event effect(SEE)tests,which is cooperating...The main work of the irradiation technique group focuses on the following two aspects in 2016:1.Technique support We have had about 772.5 h beam time for 39 rounds of single event effect(SEE)tests,which is cooperating with various institutes,universities,and companies.The tests are the basic safeguard for the spacecraft and satellite.In order to guarantee the test efficiency of the Terminal 5,the maintenance and improvement for the vacuum,the sample transfer and beam monitor system have been achieved.展开更多
The gate dielectric thickness decreases dramatically with the continuous scaling of MOS devices,which has serious consequences on the leakage current and the power consumption of the SiO2-based MOS devices.Hafnium dio...The gate dielectric thickness decreases dramatically with the continuous scaling of MOS devices,which has serious consequences on the leakage current and the power consumption of the SiO2-based MOS devices.Hafnium dioxide(HfO2),as a kind of high-k material,are recognized as alternatives to SiO2 for future advanced gate devices and space applications[1].Radiation-induced effects on conventional SiO2 dielectrics have been investigated.Now,an enormous amount of effort was required to adapt the new high-k systems for radiation hard application.展开更多
基金supported by the National Natural Science Foundation of China (Grant No. 51609222)the Natural Science Foundation of Shandong Province (Grant No. ZR2016EEB03)+2 种基金the Opening Fund of State Key Laboratory of Coastal and Offshore Engineering (Dalian University of Technology) (Grant No. LP1505)the Opening Fund of State Key Laboratory of Hydraulic Engineering Simulation and Safety (Tianjin University) (Grant No. HESS-1602)the Fundamental Research Funds for the Central Universities (Grant No. 201513039)
文摘In order to theoretically study the buckle propagation of subsea pipelines with slip-on buckle arrestors, a two-dimensional ring model was set up to represent the pipeline and a nonlinear spring model was adopted to simulate the contact between pipeline's inner walls and between pipeline's outer wall and slip-on buckle arrestor's inner wall during buckle propagation. In addition, some reverse springs are added to prevent the wall of left and right sides separating from the inner wall of slip-on buckle arrestors. Considering large deformation kinematics relations and the elastic-plastic constitutive relation of material, balance equations were established with the principle of virtual work. The variation of external pressure with respect to the cross-sectional area of pipelines was analyzed, and the lower bound of the crossover pressure of slip-on buckle arrestors was calculated based on Maxwell's energy balance method. By comparing the theoretical results with experiment and finite element numerical simulation, the theoretical method is proved to be correct and reliable.
文摘Nanopores and nanochannels produced by etching heavy ion tracks are widely used in contemporary science and technology[1]. Conical and doubly-conical nanopores (channels) have attracted special interest in the past decade due to their potential in modern and rapidly growing fields, including molecular sensors, logic gates, nanoactuators, and other nanofluidic devices[2;3].
文摘PRESTAGE is a Monte Carlo simulation code which calculates proton single event effect cross sections from heavy ion test data. It can accurately predict not only single event upsets induced by proton indirect ionization,but also single event latch-ups and proton direct ionization effects[1]. However, in practical applications some of the input parameters are difficult to obtain. For instance, the thickness of the sensitive volume is closely related to the topology, doping concentration, and other device parameters. Device suppliers are generally reluctant to disclose such information due to the consideration of intellectual property protection. Therefore, examining the sensitivity to the input parameters is important to the usage of the PRESTAGE method.
文摘Space radiation environments in which satellites and spacecraft are flying contain a large amount of high-energy protons. These protons could induce single event effects in semi-conductor devices and severely destroy the operational reliability of the device. Therefore, estimating proton single event effect cross-sections and calculating error rates in space for the spaceflight devices are vital to the safety guarantee of the satellite in orbit[1]. Nowadays, the most commonly used theoretical methods of predicting proton single event effect cross-sections give inaccurate predictions in many circumstances[2].
文摘Because single track is the elementary building block for nanoporous membrane, the understanding and controlling of their individual properties should be crucial in ion separation, ion filtration, and bio-molecule detection using arrays of identical nanopores[1;2]. Here, by irradiating the graphene/PET sample with single ion, the single suspended graphene nanopore can be obtained after chemical etching of irradiated PET membrane[3].
文摘VATA160 is a low-noise, low-power commercial Application Specific Integrated Circuit (ASIC) chip designed by IDEAS (Norway). It is a core device in the electronics system of the sub-detectors on the scientific satellite Dark Matter Particle Explorer (DAMPE)[1]. During its service period, DAMPE will encounter energetic and high flux protons from the space radiation environments.
文摘Enhancing the thermal stability of separator is the main strategy for improving the safety of lithium-ion batteries(LIBs)against thermal runaway.We successfully developed a roll-to-roll process to fabricate a COF(covalent organic framework)-modi ed polyimide(PI)ion track-etched separator by combining heavy ion track etching and doctor blade coating to achieve highly safe LIBs(Fig.1).
文摘This work is mainly to study the effect of heavy ion irradiation on the damage of single layer MoS2.The number of layers of MoS2 prepared by CVD(chemical vapor deposition)method was determined by optical microscopy and Raman spectroscopy.The monolayer MoS2 prepared by CVD under high energy 209Bi ion irradiation was analyzed by Raman analysis and AFM observation.And the results are compared and analyzed before and after the beam irradiation of single layer MoS2 prepared by mechanical stripping method.
文摘The main work of the irradiation technique group focuses on the following two aspects in 2016:1.Technique support We have had about 772.5 h beam time for 39 rounds of single event effect(SEE)tests,which is cooperating with various institutes,universities,and companies.The tests are the basic safeguard for the spacecraft and satellite.In order to guarantee the test efficiency of the Terminal 5,the maintenance and improvement for the vacuum,the sample transfer and beam monitor system have been achieved.
文摘The gate dielectric thickness decreases dramatically with the continuous scaling of MOS devices,which has serious consequences on the leakage current and the power consumption of the SiO2-based MOS devices.Hafnium dioxide(HfO2),as a kind of high-k material,are recognized as alternatives to SiO2 for future advanced gate devices and space applications[1].Radiation-induced effects on conventional SiO2 dielectrics have been investigated.Now,an enormous amount of effort was required to adapt the new high-k systems for radiation hard application.
