ARM Cortex-A系列处理器首次集成了NEON技术,可以有效加速多媒体应用。本文基于Cortex-A9处理器,对NEON技术进行研究,并对JM解码器进行NEON优化,提供实际优化效果。在PandaBoard开发板上对不同分辨率的多个测试序列进行了解码测试,测试...ARM Cortex-A系列处理器首次集成了NEON技术,可以有效加速多媒体应用。本文基于Cortex-A9处理器,对NEON技术进行研究,并对JM解码器进行NEON优化,提供实际优化效果。在PandaBoard开发板上对不同分辨率的多个测试序列进行了解码测试,测试结果显示,优化后的解码速率提高了,而且提高分辨率并不影响优化效果。展开更多
The pulsed electron beam rf ion storage system is used to study neon ions electron transfer, The rate coefficients for electron transfer of the neon ions with the neon gas are measured, the results are better than tho...The pulsed electron beam rf ion storage system is used to study neon ions electron transfer, The rate coefficients for electron transfer of the neon ions with the neon gas are measured, the results are better than those in other ion storage system.展开更多
基于ARM Cortex A53处理器平台,对NEON协处理器的指令和编程优化方法等技术进行了分析,并以此平台进行了D2C(Depth to Color)算法的优化实现。在树莓派3B+SDK开发板上进行了充分实验,测试结果表明,NEON/VFP协处理器在保持高的算法精度...基于ARM Cortex A53处理器平台,对NEON协处理器的指令和编程优化方法等技术进行了分析,并以此平台进行了D2C(Depth to Color)算法的优化实现。在树莓派3B+SDK开发板上进行了充分实验,测试结果表明,NEON/VFP协处理器在保持高的算法精度的同时可以较好地提高D2C算法的运算效率,并且保持低功耗、低成本。展开更多
Neon flying squid, Ommastrephes bartramii, is a squid species of the North Pacific Ocean, which plays an important economical role in the international fishery. Logbook data for Chinese squid-jigging fishery over 2004...Neon flying squid, Ommastrephes bartramii, is a squid species of the North Pacific Ocean, which plays an important economical role in the international fishery. Logbook data for Chinese squid-jigging fishery over 2004–2011 were used to evaluate the relationship between the fishing grounds of the squid and the convergent frontal areas, which were defined by the contour lines of specific sea surface temperature(SST) and chlorophyll-a(Chl-a) concentration. Our results indicate that the SST in the range of 15 to 19℃ and the Chl-a concentration in the range of 0.1 to 0.4 mg m^(-3) are the favorable conditions for the aggregation of the squid. Additionally, we deduced that the SST at 17.5℃ and the Chl-a concentration at 0.25 mg m^(-3) are the optimal environmental conditions for the aggregation of O. bartramii. In August, the annual CPUE is positively correlated with the proportion of the fishing grounds with favorable SST and Chl-a concentration, as well as the combination of the two variables, implying that the abundance of the squid annually is largely depending on the presence of the favorable environmental conditions for fishery in August. Minor spatial difference between mean latitudinal location of the 17.5℃ SST and 0.25 mg m^(-3) Chl-a fronts can increase the CPUEs of O. bartramii. Furthermore, the monthly latitudinal gravity centers of the CPUE closely followed the mean latitudinal position of the contour lines of the 17.5℃ SST and the 0.25 mg m^(-3) Chl-a concentration. Our findings suggest the convergent oceanographic features(fronts) play significant roles in regulating the distribution and abundance of the western stock of the winter-spring cohort of O. bartramii, which can help people to improve their ability to discover the O. bartramii fishing grounds with higher productivity.展开更多
A neon plasma jet was generated in air, driven by a 9 kHz sinusoidal power supply. The characteristics of the plasma plume and the optical spectra with plasma propagation for different applied voltages were investigat...A neon plasma jet was generated in air, driven by a 9 kHz sinusoidal power supply. The characteristics of the plasma plume and the optical spectra with plasma propagation for different applied voltages were investigated. By increasing the applied voltage, the plasma plume first increases and then retracts to become short and bulky. The shortened effect of Ne plasma plume （about 10 mm） for the further voltage increasing is more apparent than that of He （about 3 mm） and Ar （about 1 mm）. Emission intensity of the N2 （337 am） increases with the applied voltage, gradually substituting the emission intensity of Ne （702 nm and 585 am） as the noticeable radiation. At the nozzle opening, the Ne （702 am） emission dominates, while the Ne （585 nm） emission is most noticeable around the tip of the plasma plume. The spatial distribution of the three spectral lines indicates that Ne （702 nm） emission decreases dramatically with plasma propagation while Ne （585 am） and N2 （337 nm） emissions reach their maxima at the middle of the plasma plume. The results indicate that the Ne （702 nm） emission is much more sensitive to the average electron temperature and the density of the high-energy electrons, so it changes greatly at the tube nozzle and little at the tip region as the voltage increases. The population of high-energy electrons, the average electron temperature, the collision with air molecules and the Penning effect between Ne metastables and air molecules may explain their different variations with plasma propagating and voltage increasing.展开更多
The interaction between neon and x-ray free-electron lasers with different laser parameters is systematically studied by solving a set of coupled rate equations. As an example, the evolution of 1s^12 s^22 p^6 configur...The interaction between neon and x-ray free-electron lasers with different laser parameters is systematically studied by solving a set of coupled rate equations. As an example, the evolution of 1s^12 s^22 p^6 configuration is given under different incident photon numbers, pulse widths, and photon energies. We have also determined all of the charge-state populations as a function of three laser pulse parameters by averaging over time. The result shows that the variations of these charge-state populations demonstrate a pattern when the pulse width is shorter than 10 fs: some of the charge-states decrease rapidly,while the others rise but remain relatively constant for pulse width larger than 10 fs. The variation of the average charge with three parameters has also obtained. The average charge decreases for a pulse width shorter than 10 fs but remains basically unchanged for a pulse width longer than 10 fs.展开更多
Yeast strain Saccharornyces cerevisiae was irradiated with different doses of 85 MeV/u 20 Ne 10＋ to investigate DNA damage induced by heavy ion beam in eukaryotic microorganism. The survival rate, DNA double strand b...Yeast strain Saccharornyces cerevisiae was irradiated with different doses of 85 MeV/u 20 Ne 10＋ to investigate DNA damage induced by heavy ion beam in eukaryotic microorganism. The survival rate, DNA double strand breaks （DSBs） and DNA polymorphic were tested after irradiation. The results showed that there were substantial differences in DNA between the control and irradiated samples. At the dose of 40 Gy, the yeast cell survival rate approached 50%, DNA double-strand breaks were barely detectable, and significant DNA polymorphism was observed. The alcohol dehydrogenase II gene was amplified and sequenced. It was observed that base changes in the mutant were mainly transversions of T-G and T-C. It can be concluded that heavy ion beam irradiation can lead to change in single gene and may be an effective way to induce mutation.展开更多
By using soft X-ray spectroscopy, we investigate the inner-shell excitation and relaxation processes in atomic and ionic neon targets. Resonant X-ray emission spectroscopy was applied to neutral neon atom in the regio...By using soft X-ray spectroscopy, we investigate the inner-shell excitation and relaxation processes in atomic and ionic neon targets. Resonant X-ray emission spectroscopy was applied to neutral neon atom in the regions of the [1s]np （n = 3, 4,…, ε） excited states and [1s2p]3pmp （m = 3,4） doubly excited states to obtain the spectroscopic information on the [2p]np and [2p^2]3prnp final electronic states, where square brackets indicate hole states. The energy levels of the [2p^2]3prnp （m = 3,4） electronic states were spectroscopically measured for the first time. As for the ionic neon target, on the other hand, the photoion yield spectroscopy was adopted to survey the 1s→ np （n = 2, 3） resonant excitation and subsequent Auger decay processes for Ne^＋ target-ions. The observed Ne^2＋ photoion yield spectrum is successflllly explained by the theoretical calculations based on the nmlticonfiguration Dirac-Fock method展开更多
文摘The pulsed electron beam rf ion storage system is used to study neon ions electron transfer, The rate coefficients for electron transfer of the neon ions with the neon gas are measured, the results are better than those in other ion storage system.
文摘基于ARM Cortex A53处理器平台,对NEON协处理器的指令和编程优化方法等技术进行了分析,并以此平台进行了D2C(Depth to Color)算法的优化实现。在树莓派3B+SDK开发板上进行了充分实验,测试结果表明,NEON/VFP协处理器在保持高的算法精度的同时可以较好地提高D2C算法的运算效率,并且保持低功耗、低成本。
基金supported by the China Postdoctoral Science Foundation (No.2017M611612)the Doctoral Startup Scientific Research Foundation of Shanghai Ocean University (No.A2-0203-17-100313)+2 种基金the National Key Technologies R&D Program of China (No.2013BAD13B01)the Open Fund for Key Laboratory of Sustainable Exploitation of Oceanic Fisheries Resources in Shanghai Ocean University (No.A1-0203-002009-5)the Shanghai Universities First-Class Disciplines Project (Fisheries A)
文摘Neon flying squid, Ommastrephes bartramii, is a squid species of the North Pacific Ocean, which plays an important economical role in the international fishery. Logbook data for Chinese squid-jigging fishery over 2004–2011 were used to evaluate the relationship between the fishing grounds of the squid and the convergent frontal areas, which were defined by the contour lines of specific sea surface temperature(SST) and chlorophyll-a(Chl-a) concentration. Our results indicate that the SST in the range of 15 to 19℃ and the Chl-a concentration in the range of 0.1 to 0.4 mg m^(-3) are the favorable conditions for the aggregation of the squid. Additionally, we deduced that the SST at 17.5℃ and the Chl-a concentration at 0.25 mg m^(-3) are the optimal environmental conditions for the aggregation of O. bartramii. In August, the annual CPUE is positively correlated with the proportion of the fishing grounds with favorable SST and Chl-a concentration, as well as the combination of the two variables, implying that the abundance of the squid annually is largely depending on the presence of the favorable environmental conditions for fishery in August. Minor spatial difference between mean latitudinal location of the 17.5℃ SST and 0.25 mg m^(-3) Chl-a fronts can increase the CPUEs of O. bartramii. Furthermore, the monthly latitudinal gravity centers of the CPUE closely followed the mean latitudinal position of the contour lines of the 17.5℃ SST and the 0.25 mg m^(-3) Chl-a concentration. Our findings suggest the convergent oceanographic features(fronts) play significant roles in regulating the distribution and abundance of the western stock of the winter-spring cohort of O. bartramii, which can help people to improve their ability to discover the O. bartramii fishing grounds with higher productivity.
基金supported by National Natural Science Fundation of China(No.61271053)the Natural Science Foundation of Jiangsu Province of China(No.BK2012737)the Foundation for Excellent Youth Scholars of Southeast University,China
文摘A neon plasma jet was generated in air, driven by a 9 kHz sinusoidal power supply. The characteristics of the plasma plume and the optical spectra with plasma propagation for different applied voltages were investigated. By increasing the applied voltage, the plasma plume first increases and then retracts to become short and bulky. The shortened effect of Ne plasma plume （about 10 mm） for the further voltage increasing is more apparent than that of He （about 3 mm） and Ar （about 1 mm）. Emission intensity of the N2 （337 am） increases with the applied voltage, gradually substituting the emission intensity of Ne （702 nm and 585 am） as the noticeable radiation. At the nozzle opening, the Ne （702 am） emission dominates, while the Ne （585 nm） emission is most noticeable around the tip of the plasma plume. The spatial distribution of the three spectral lines indicates that Ne （702 nm） emission decreases dramatically with plasma propagation while Ne （585 am） and N2 （337 nm） emissions reach their maxima at the middle of the plasma plume. The results indicate that the Ne （702 nm） emission is much more sensitive to the average electron temperature and the density of the high-energy electrons, so it changes greatly at the tube nozzle and little at the tip region as the voltage increases. The population of high-energy electrons, the average electron temperature, the collision with air molecules and the Penning effect between Ne metastables and air molecules may explain their different variations with plasma propagating and voltage increasing.
基金Project supported by the National Natural Science Foundation of China(Grant No.11474208)
文摘The interaction between neon and x-ray free-electron lasers with different laser parameters is systematically studied by solving a set of coupled rate equations. As an example, the evolution of 1s^12 s^22 p^6 configuration is given under different incident photon numbers, pulse widths, and photon energies. We have also determined all of the charge-state populations as a function of three laser pulse parameters by averaging over time. The result shows that the variations of these charge-state populations demonstrate a pattern when the pulse width is shorter than 10 fs: some of the charge-states decrease rapidly,while the others rise but remain relatively constant for pulse width larger than 10 fs. The variation of the average charge with three parameters has also obtained. The average charge decreases for a pulse width shorter than 10 fs but remains basically unchanged for a pulse width longer than 10 fs.
基金supported by Natural Science Foundation of Gansu Province (No.096RJZA126),Department of Science And Technology, Gansu Province, China
文摘Yeast strain Saccharornyces cerevisiae was irradiated with different doses of 85 MeV/u 20 Ne 10＋ to investigate DNA damage induced by heavy ion beam in eukaryotic microorganism. The survival rate, DNA double strand breaks （DSBs） and DNA polymorphic were tested after irradiation. The results showed that there were substantial differences in DNA between the control and irradiated samples. At the dose of 40 Gy, the yeast cell survival rate approached 50%, DNA double-strand breaks were barely detectable, and significant DNA polymorphism was observed. The alcohol dehydrogenase II gene was amplified and sequenced. It was observed that base changes in the mutant were mainly transversions of T-G and T-C. It can be concluded that heavy ion beam irradiation can lead to change in single gene and may be an effective way to induce mutation.
文摘By using soft X-ray spectroscopy, we investigate the inner-shell excitation and relaxation processes in atomic and ionic neon targets. Resonant X-ray emission spectroscopy was applied to neutral neon atom in the regions of the [1s]np （n = 3, 4,…, ε） excited states and [1s2p]3pmp （m = 3,4） doubly excited states to obtain the spectroscopic information on the [2p]np and [2p^2]3prnp final electronic states, where square brackets indicate hole states. The energy levels of the [2p^2]3prnp （m = 3,4） electronic states were spectroscopically measured for the first time. As for the ionic neon target, on the other hand, the photoion yield spectroscopy was adopted to survey the 1s→ np （n = 2, 3） resonant excitation and subsequent Auger decay processes for Ne^＋ target-ions. The observed Ne^2＋ photoion yield spectrum is successflllly explained by the theoretical calculations based on the nmlticonfiguration Dirac-Fock method
