BACKGROUND Fat embolism syndrome(FES)is a rare complication caused by the presence of fat particles in the microcirculation,which usually occurs within 12-72 h after trauma.At present,there have been few cases of fat ...BACKGROUND Fat embolism syndrome(FES)is a rare complication caused by the presence of fat particles in the microcirculation,which usually occurs within 12-72 h after trauma.At present,there have been few cases of fat embolism presenting within 3 h after trauma.Here,we report a case of femoral fracture complicated with an acute fat embolism caused by a car accident.CASE SUMMARY A 29-year-old woman with pain,swelling and limited movement of her left lower limb after a car accident was taken by ambulance to our hospital.X-ray examination showed fracture of the middle and lower part of the left femur and fracture of the base of the left fifth metatarsal bone.She was hospitalized and admitted to the orthopedic ward.After the attending doctor performed tibial tubercle bone traction,the patient became confused,followed by respiratory distress.Finally,she was transferred to the intensive care unit.After nearly a month of treatment in the intensive care unit,the patient's cognitive function gradually recovered over 6 mo.CONCLUSION For patients with early traumatic fractures,young emergency physicians and orthopedics should be aware of the possibility of FES.展开更多
A series of barium pyrophosphate Ba2P2O7(BPO)phosphors doped with Ce3+or Tb3+ions is synthesized via a co-precipitation method under reducing atmosphere.The phase structures,photoluminescence(PL)properties,and thermal...A series of barium pyrophosphate Ba2P2O7(BPO)phosphors doped with Ce3+or Tb3+ions is synthesized via a co-precipitation method under reducing atmosphere.The phase structures,photoluminescence(PL)properties,and thermal stabilities of the samples are characterized by using powder x-ray diffraction(PXRD)and PL spectra.The emission colors of samples can be tuned from blue(0.1544,0.0310)to green(0.2302,0.4229)by changing the doping concentrations of Tb3+under ultraviolet excitation.The energy transfer mechanism between Ce3+and Tb3+in the BPO is dipole–dipole interaction with a critical distance of 25.86°A and an energy transfer efficiency of about 85%,which are determined through the PL spectrum and the decay curve.Moreover,the Ce3+/Tb3+co-doped sample has good thermal stability for temperature quenching,and the emission intensity at 423 K is maintained at 95%measured at 298 K.The above results show that the BPO:Ce3+,Tb3+can serve as a promising candidate of green emitting phosphor for solid-state lighting.展开更多
文摘BACKGROUND Fat embolism syndrome(FES)is a rare complication caused by the presence of fat particles in the microcirculation,which usually occurs within 12-72 h after trauma.At present,there have been few cases of fat embolism presenting within 3 h after trauma.Here,we report a case of femoral fracture complicated with an acute fat embolism caused by a car accident.CASE SUMMARY A 29-year-old woman with pain,swelling and limited movement of her left lower limb after a car accident was taken by ambulance to our hospital.X-ray examination showed fracture of the middle and lower part of the left femur and fracture of the base of the left fifth metatarsal bone.She was hospitalized and admitted to the orthopedic ward.After the attending doctor performed tibial tubercle bone traction,the patient became confused,followed by respiratory distress.Finally,she was transferred to the intensive care unit.After nearly a month of treatment in the intensive care unit,the patient's cognitive function gradually recovered over 6 mo.CONCLUSION For patients with early traumatic fractures,young emergency physicians and orthopedics should be aware of the possibility of FES.
基金Natural Science Foundation of Xinjiang Uygur Autonomous Region,China(Grant No.2017D01C037).
文摘A series of barium pyrophosphate Ba2P2O7(BPO)phosphors doped with Ce3+or Tb3+ions is synthesized via a co-precipitation method under reducing atmosphere.The phase structures,photoluminescence(PL)properties,and thermal stabilities of the samples are characterized by using powder x-ray diffraction(PXRD)and PL spectra.The emission colors of samples can be tuned from blue(0.1544,0.0310)to green(0.2302,0.4229)by changing the doping concentrations of Tb3+under ultraviolet excitation.The energy transfer mechanism between Ce3+and Tb3+in the BPO is dipole–dipole interaction with a critical distance of 25.86°A and an energy transfer efficiency of about 85%,which are determined through the PL spectrum and the decay curve.Moreover,the Ce3+/Tb3+co-doped sample has good thermal stability for temperature quenching,and the emission intensity at 423 K is maintained at 95%measured at 298 K.The above results show that the BPO:Ce3+,Tb3+can serve as a promising candidate of green emitting phosphor for solid-state lighting.
