An analysis of the delay Doppler maps(DDMs) data from the CYGNSS satellites is implemented to derive the sea surface height(SSH). An SSH estimation algorithm, the leading edge derivation(LED) method which is applied t...An analysis of the delay Doppler maps(DDMs) data from the CYGNSS satellites is implemented to derive the sea surface height(SSH). An SSH estimation algorithm, the leading edge derivation(LED) method which is applied to the delay waveforms, is applied to the DDMs, while the tropospheric delay methods, the Saastamoinen method(SM)and the numerical method(NM) are used. The results show that when the SSH from Jason-2 is referred to as the truth, if the tropospheric delay is corrected, the SSH bias can decrease. The resulted SSH bias from the Jason-2 SSH by the LED retrieval method is of order meter. The resulted SSH deviation from the truth by the NM scheme is half as small as that by the SM scheme. Since the SM scheme is not applicable to the nonhydrostatical condition, the resulted bias is larger.The work can be applied to the Beidou system in the future.展开更多
目的:评估一种改良上颌窦底内提升术在口腔种植修复中的临床效果。方法:在2016-12—2018-07期间,于56例上颌后牙缺失患者共83个位点,行穿牙槽嵴顶四周剥离上颌窦底提升术。术前CBCT测量剩余骨高度(residual bone height,RBH),术中植骨,...目的:评估一种改良上颌窦底内提升术在口腔种植修复中的临床效果。方法:在2016-12—2018-07期间,于56例上颌后牙缺失患者共83个位点,行穿牙槽嵴顶四周剥离上颌窦底提升术。术前CBCT测量剩余骨高度(residual bone height,RBH),术中植骨,同期或延期植入种植体。术后即刻拍摄CBCT测量上颌窦底提升高度并观察窦底黏膜完整性。术后至少4个月完成修复,随访观察种植体存留率。结果:3个位点术中因上颌窦黏膜破裂改为侧壁开窗上颌窦底提升术,位点黏膜破裂率为3.61%。其余80个位点术后即刻CBCT显示其中5个位点上颌窦底黏膜破裂,位点黏膜破裂率为6.02%。80个位点中76个位点同期种植,3个位点延期种植,1个位点放弃种植。种植体直径为4.0~5.1 mm,平均(4.73±0.35)mm,长度为8.0~11.5 mm,平均(10.27±0.69)mm。上颌窦底黏膜未破裂的75个位点,术前RBH为0.88~9.27 mm,平均(5.57±1.91)mm;上颌窦底提升高度为4.54~15.14 mm,平均(8.09±1.99)mm。手术至修复时间为4~15个月,平均(7.14±2.06)个月,修复后随访时间为1~20个月,平均(9.36±4.60)个月。2枚种植体于修复前脱落,1枚种植体于修复后脱落,总体种植体存留率96.25%。结论:穿牙槽嵴顶四周剥离,行上颌窦底内提升创伤小,相对安全可靠,短期种植修复效果满意。展开更多
EI Nino （EN） episodes can be classified based on their time of onset as spring onset EN （SPEN） events and summer onset EN （SUEN） events. To evaluate the different influences of SPEN and SUEN events on the South ...EI Nino （EN） episodes can be classified based on their time of onset as spring onset EN （SPEN） events and summer onset EN （SUEN） events. To evaluate the different influences of SPEN and SUEN events on the South Asian high （SAH）, this study compared the seasonal evolution of the SAH （SESAH） associated with SPEN and SUEN events through analysis of geopotential height and zonal wind data derived from NCEP-NCAR Reanalysis-1 and sea surface temperature data obtained from the Hadley Center. The main features of the SESAH during an EN event are similar to its climatological characteristics. Climatologically, the SAH forms in May, strengthens, and moves northwestward in June and July. It does not change much in August, but then it returns south and weakens during September and October. However, its lifespan is shorter and its intensity weaker during EN periods. Furthermore, there are significant differences between the SESAH during SPEN and SUEN events. During a SPEN episode, the movement of the SAH to the northwest during May and June is slower than during a SUEN event, i.e. the SPEN SAH has a shorter lifespan. In comparison with the SUEN SAH, the SPEN SAH in July and September tends more towards the Tibetan high mode rather than the Iranian high mode. The SPEN SAH in October moves southeastward faster than the SUEN SAH, which also indicates that the SAH has a shorter lifespan during a SPEN event than during a SUEN episode.展开更多
Flowers,trees and coral like TiO_(2)Rlms are first produced by the micro-arc-oxidation method in electrolyte of phosphate.Nanowhiskers with high surface area grow at the tail ends of the coralloid film when the positi...Flowers,trees and coral like TiO_(2)Rlms are first produced by the micro-arc-oxidation method in electrolyte of phosphate.Nanowhiskers with high surface area grow at the tail ends of the coralloid film when the positive current density is set to be 17.14 A/dm^(2).With acetamide in electrolyte,N element is doped.The analysis results indicate that the ratio of anatase phase to rutile phases is about 2:1 in the micro-arc-oxidation produced N-TiO_(2)film.The optical absorption edge red shifts in the presence of N doping.展开更多
基金National Natural Science Foundation of China(41875060, U1606405)。
文摘An analysis of the delay Doppler maps(DDMs) data from the CYGNSS satellites is implemented to derive the sea surface height(SSH). An SSH estimation algorithm, the leading edge derivation(LED) method which is applied to the delay waveforms, is applied to the DDMs, while the tropospheric delay methods, the Saastamoinen method(SM)and the numerical method(NM) are used. The results show that when the SSH from Jason-2 is referred to as the truth, if the tropospheric delay is corrected, the SSH bias can decrease. The resulted SSH bias from the Jason-2 SSH by the LED retrieval method is of order meter. The resulted SSH deviation from the truth by the NM scheme is half as small as that by the SM scheme. Since the SM scheme is not applicable to the nonhydrostatical condition, the resulted bias is larger.The work can be applied to the Beidou system in the future.
基金supported by the National Natural Science Foundation of China[grant numbers 41641042,41675039,41305039,91537213,41375047,41375092,41475140,41575057]the Priority Academic Program Development of Jiangsu Higher Education Institutions(PAPD)
文摘EI Nino （EN） episodes can be classified based on their time of onset as spring onset EN （SPEN） events and summer onset EN （SUEN） events. To evaluate the different influences of SPEN and SUEN events on the South Asian high （SAH）, this study compared the seasonal evolution of the SAH （SESAH） associated with SPEN and SUEN events through analysis of geopotential height and zonal wind data derived from NCEP-NCAR Reanalysis-1 and sea surface temperature data obtained from the Hadley Center. The main features of the SESAH during an EN event are similar to its climatological characteristics. Climatologically, the SAH forms in May, strengthens, and moves northwestward in June and July. It does not change much in August, but then it returns south and weakens during September and October. However, its lifespan is shorter and its intensity weaker during EN periods. Furthermore, there are significant differences between the SESAH during SPEN and SUEN events. During a SPEN episode, the movement of the SAH to the northwest during May and June is slower than during a SUEN event, i.e. the SPEN SAH has a shorter lifespan. In comparison with the SUEN SAH, the SPEN SAH in July and September tends more towards the Tibetan high mode rather than the Iranian high mode. The SPEN SAH in October moves southeastward faster than the SUEN SAH, which also indicates that the SAH has a shorter lifespan during a SPEN event than during a SUEN episode.
基金Supported by the Fundamental Research Funds for the Central Universities under Grant No 0910KYZY48the National Natural Science Foundation of China under Grant No 10705056the National 985 Program of China under Grant Nos 98503-008006 and 98503-008017.
文摘Flowers,trees and coral like TiO_(2)Rlms are first produced by the micro-arc-oxidation method in electrolyte of phosphate.Nanowhiskers with high surface area grow at the tail ends of the coralloid film when the positive current density is set to be 17.14 A/dm^(2).With acetamide in electrolyte,N element is doped.The analysis results indicate that the ratio of anatase phase to rutile phases is about 2:1 in the micro-arc-oxidation produced N-TiO_(2)film.The optical absorption edge red shifts in the presence of N doping.
