连续54例经 B 型超声诊断为下肢急性近端深静脉血栓形成的患者分两组:A 组17例患者检出漂浮血栓,B 组37例为非漂浮(附壁)血栓。A 组5例(29.4%)和 B 组4例(10.8%)(P=0.12)在超声检查前已诊断肺栓塞。另4例患者在随访过程中发生经肺扫描...连续54例经 B 型超声诊断为下肢急性近端深静脉血栓形成的患者分两组:A 组17例患者检出漂浮血栓,B 组37例为非漂浮(附壁)血栓。A 组5例(29.4%)和 B 组4例(10.8%)(P=0.12)在超声检查前已诊断肺栓塞。另4例患者在随访过程中发生经肺扫描证实的肺栓塞。肺栓塞发生率在 A 组中为42.9%(3/7例),B 组中为4.8%(1/21例)(P=0.04),其中3例 A 组患者静脉超声显象表明原漂浮血栓游离段均已消失。本文证实:(1)静脉漂浮血栓时发生肺栓塞的危险性增加,(2)在密切超声随访过程中,漂浮血栓游离段的突然消失强烈提示肺栓塞。展开更多
First-principles spin-polarized density functional theory （DFT） investigations of the structural, electronic, magnetic, and thermodynamics characteristics of the half-Heusler, CoMnTe and RuMnTe compounds are carried...First-principles spin-polarized density functional theory （DFT） investigations of the structural, electronic, magnetic, and thermodynamics characteristics of the half-Heusler, CoMnTe and RuMnTe compounds are carried out. Calculations are accomplished within a state of the art full-potential （FP） linearized （L） augmented plane wave plus a local orbital （APW ＋ lo） computational approach framed within DFT. The generalized gradient approximation （GGA） parameterized by Perdew, Burke, and Ernzerhof （PBE） is implemented as an exchange correlation functional as a part of the total energy calculation. From the analysis of the calculated electronic band structure as well as the density of states for both compounds, a strong hybridization between d states of the higher valent transition metal （TM） atoms （Co, Ru） and lower valent TM atoms of （Mn） is observed. Furthermore, total and partial density of states （PDOS） of the ground state and the results of spin magnetic moments reveal that these compounds are both stable and ideal half-metallic ferromagnetic. The effects of the unit cell volume on the magnetic properties and half-metaliicity are crucial. It is worth noting that our computed results of the total spin magnetic moments, for CoMnTe equal to 4 ~tB and 3 p-B per unit cell for RuMnTe, nicely follow the rule μ2tot = Zt - 18. Using the quasi-harmonic Debye model, which considers the phononic effects, the effecs of pressure P and temperature T on the lattice parameter, bulk modulus, thermal expansion coefficient, Debye temperature, and heat capacity for these compounds are investigated for the first time.展开更多
文摘连续54例经 B 型超声诊断为下肢急性近端深静脉血栓形成的患者分两组:A 组17例患者检出漂浮血栓,B 组37例为非漂浮(附壁)血栓。A 组5例(29.4%)和 B 组4例(10.8%)(P=0.12)在超声检查前已诊断肺栓塞。另4例患者在随访过程中发生经肺扫描证实的肺栓塞。肺栓塞发生率在 A 组中为42.9%(3/7例),B 组中为4.8%(1/21例)(P=0.04),其中3例 A 组患者静脉超声显象表明原漂浮血栓游离段均已消失。本文证实:(1)静脉漂浮血栓时发生肺栓塞的危险性增加,(2)在密切超声随访过程中,漂浮血栓游离段的突然消失强烈提示肺栓塞。
基金financial support provided by the Deanship of Scientific Research at King Saud University for funding this work through research group project No: RPG-VPP-088
文摘First-principles spin-polarized density functional theory （DFT） investigations of the structural, electronic, magnetic, and thermodynamics characteristics of the half-Heusler, CoMnTe and RuMnTe compounds are carried out. Calculations are accomplished within a state of the art full-potential （FP） linearized （L） augmented plane wave plus a local orbital （APW ＋ lo） computational approach framed within DFT. The generalized gradient approximation （GGA） parameterized by Perdew, Burke, and Ernzerhof （PBE） is implemented as an exchange correlation functional as a part of the total energy calculation. From the analysis of the calculated electronic band structure as well as the density of states for both compounds, a strong hybridization between d states of the higher valent transition metal （TM） atoms （Co, Ru） and lower valent TM atoms of （Mn） is observed. Furthermore, total and partial density of states （PDOS） of the ground state and the results of spin magnetic moments reveal that these compounds are both stable and ideal half-metallic ferromagnetic. The effects of the unit cell volume on the magnetic properties and half-metaliicity are crucial. It is worth noting that our computed results of the total spin magnetic moments, for CoMnTe equal to 4 ~tB and 3 p-B per unit cell for RuMnTe, nicely follow the rule μ2tot = Zt - 18. Using the quasi-harmonic Debye model, which considers the phononic effects, the effecs of pressure P and temperature T on the lattice parameter, bulk modulus, thermal expansion coefficient, Debye temperature, and heat capacity for these compounds are investigated for the first time.
