The effect of diluted solution's magnetization on induction time and growth period of natural gas hydrate (NGH) has been investigated in quiescent reaction system at pressure of 4. 5 MPa and temperature of 274 K w...The effect of diluted solution's magnetization on induction time and growth period of natural gas hydrate (NGH) has been investigated in quiescent reaction system at pressure of 4. 5 MPa and temperature of 274 K with SDS as surfactant, by using volume fixed and pressure falling method. Experimental results show that magnetization will have effect on the induction time of NGH. After magnetization with magnetic field intensity of 0.33 T, the induction time of NGH has been reduced to 47 min (average) from 99 min (average) in which there is no magnetization. On the other hand, the induction time has been prolonged after magnetization of the diluted solution with magnetic field intensity of 0.05 T, 0. 11 T, 0.22 T, 0.44T. Especially with magnetic field intensity of 0.11 T, the induction time had even been prolonged to 431min (average). The effect of magnetization on the growth period of NGH has not been found at the experimental condition.展开更多
[目的]探讨磁化处理对低温保存鸡精液品质的影响。[方法]将5 m l新鲜精液平均分为5份,每份按1∶4（V/V）进行稀释,其中1份为对照组,不作磁化处理,其余4份分别放入自制磁化器中磁化6、12、24、48 m in,5组均置于2-4℃的冰箱中保存,定时...[目的]探讨磁化处理对低温保存鸡精液品质的影响。[方法]将5 m l新鲜精液平均分为5份,每份按1∶4（V/V）进行稀释,其中1份为对照组,不作磁化处理,其余4份分别放入自制磁化器中磁化6、12、24、48 m in,5组均置于2-4℃的冰箱中保存,定时观测精子活率、存活时间、生存指数和畸形率。[结果]精液经磁化后活率提高,并且有效生存指数明显优于对照组,尤以磁化24 m in效果最明显,比对照组提高了7.75%,而精子的畸形率磁化组低于对照组。[结论]磁化处理可有效提高冷冻保存鸡精液的品质。展开更多
[ Objective] The study aimed to explore the effects of magnetic treatment on the quality of chicken semen stored at low temperature. [ Method] 5 ml fresh chicken semen was divided into five groups equally, each of whi...[ Objective] The study aimed to explore the effects of magnetic treatment on the quality of chicken semen stored at low temperature. [ Method] 5 ml fresh chicken semen was divided into five groups equally, each of which was diluted at the volume ratio 1：4. With the group without magnetic treatment as the control, the other four groups were magnetized for 6, 12, 24 and 48 min in the self-made magnetizer, respectively. Subsequently, all the five groups were stored at 2 -4 ℃, and the sperm motility, survival time, survival index and deformity rate were observed regularly. [ Result] Comparing with the control group, the magnetic groups showed higher sperm motilities and effective survival indices as well as lower deformity rates. The effective survival index of the group magnetized for 24 min was the highest and increased by 7.75% in con- trast to the control. [ Conclusion] Magnetic treatment can effectively enhance the quality of chicken semen stored at low temperature.展开更多
The ultrafast laser-excited magnetization dynamics of ferromagnetic （FM） La0.67Sr0.33MnO3 （LSMO） thin films with BiFeO3 （BFO） coating layers grown by laser molecular beam epitaxy are investigated using the optic...The ultrafast laser-excited magnetization dynamics of ferromagnetic （FM） La0.67Sr0.33MnO3 （LSMO） thin films with BiFeO3 （BFO） coating layers grown by laser molecular beam epitaxy are investigated using the optical pump-probe technique. Uniform magnetization precessions are observed in the films under an applied external magnetic field by measuring the time-resolved magneto-optical Kerr effect. The magnetization precession frequencies of the LSMO thin films with the BFO coating layers are lower than those of uncoated LSMO films, which is attributed to the suppression of the anisotropy field induced by the exchange interaction at the interface between the antiferromagnetic order of BFO and the FM order of LSMO.展开更多
目的探究无创诊断对儿童颅内动静脉畸形(AVM)隐匿性病变的及时精准诊断及评估价值.方法选取2017年1月至2018年12月河北省儿童医院65例疑似AVM患儿为观察组,均行MRI及3D-TOF-MT-MRA检查,比较两种检查方法图像质量、信噪比(SNR)、对比度...目的探究无创诊断对儿童颅内动静脉畸形(AVM)隐匿性病变的及时精准诊断及评估价值.方法选取2017年1月至2018年12月河北省儿童医院65例疑似AVM患儿为观察组,均行MRI及3D-TOF-MT-MRA检查,比较两种检查方法图像质量、信噪比(SNR)、对比度噪声比(CNR),以数字减影血管造影(DSA)检查结果为"金标准",比较MRI、3D-TOF-MT-MRA单独及联合诊断儿童AVM的价值及评估Spetzler-Martin分级的准确性,另选取本院收治的65例AVM患儿为对照组,两组均根据术前影像学检查结果制定手术治疗方案,比较两组手术前后生活质量(PedsQLTM4.0评分)、预后情况(改良Rankin评分),随访3年,统计比较两组并发症发生率和死亡率.结果3D-TOF-MT-MRA检查的图像质量、SNR、CNR均高于MRI检查(P<0.05);MRI、3D-TOF-MT-MRA诊断儿童AVM的曲线下面积(area under the curve,AUC)分别为0.864、0.883,二者联合诊断的AUC最大,为0.939,联合诊断的敏感度、特异度、准确度分别为97.78%、90.00%、95.38%;MRI联合3D-TOF-MT-MRA评估Spetzler-Martin分级的准确度(97.78%)高于MRI单独评估(80.00%)(P<0.05),但与3D-TOF-MT-MRA单独评估的准确度(88.89%)比较,差异无统计学意义(P>0.05);两组术后PedsQLTM4.0评分均高于术前,且观察组高于对照组,mRS评分均低于术前,且观察组低于对照组(P<0.05);观察组并发症总发生率、死亡率(6.82%、4.55%)均低于对照组(22.22%、17.46%)(P<0.05).结论3D-TOF-MT-MRA联合MRI诊断儿童AVM能有效提高诊断敏感度及准确度,且在评估Spetzler-Martin分级方面具有较高可靠性,有助于及时精准判定儿童AVM病情,指导临床制定最佳治疗方法,从而改善患儿预后.展开更多
基金supported by the National Natural Science Foundation of China (No. 50176051)the State Key Development Program for Basic Research of China (No. 2000026306).
文摘The effect of diluted solution's magnetization on induction time and growth period of natural gas hydrate (NGH) has been investigated in quiescent reaction system at pressure of 4. 5 MPa and temperature of 274 K with SDS as surfactant, by using volume fixed and pressure falling method. Experimental results show that magnetization will have effect on the induction time of NGH. After magnetization with magnetic field intensity of 0.33 T, the induction time of NGH has been reduced to 47 min (average) from 99 min (average) in which there is no magnetization. On the other hand, the induction time has been prolonged after magnetization of the diluted solution with magnetic field intensity of 0.05 T, 0. 11 T, 0.22 T, 0.44T. Especially with magnetic field intensity of 0.11 T, the induction time had even been prolonged to 431min (average). The effect of magnetization on the growth period of NGH has not been found at the experimental condition.
文摘[目的]探讨磁化处理对低温保存鸡精液品质的影响。[方法]将5 m l新鲜精液平均分为5份,每份按1∶4（V/V）进行稀释,其中1份为对照组,不作磁化处理,其余4份分别放入自制磁化器中磁化6、12、24、48 m in,5组均置于2-4℃的冰箱中保存,定时观测精子活率、存活时间、生存指数和畸形率。[结果]精液经磁化后活率提高,并且有效生存指数明显优于对照组,尤以磁化24 m in效果最明显,比对照组提高了7.75%,而精子的畸形率磁化组低于对照组。[结论]磁化处理可有效提高冷冻保存鸡精液的品质。
文摘[ Objective] The study aimed to explore the effects of magnetic treatment on the quality of chicken semen stored at low temperature. [ Method] 5 ml fresh chicken semen was divided into five groups equally, each of which was diluted at the volume ratio 1：4. With the group without magnetic treatment as the control, the other four groups were magnetized for 6, 12, 24 and 48 min in the self-made magnetizer, respectively. Subsequently, all the five groups were stored at 2 -4 ℃, and the sperm motility, survival time, survival index and deformity rate were observed regularly. [ Result] Comparing with the control group, the magnetic groups showed higher sperm motilities and effective survival indices as well as lower deformity rates. The effective survival index of the group magnetized for 24 min was the highest and increased by 7.75% in con- trast to the control. [ Conclusion] Magnetic treatment can effectively enhance the quality of chicken semen stored at low temperature.
基金supported by the National Key Basic Research Program of China(Grant Nos.2014CB921001,and 2013CB328706)the Key Research Program of Frontier Sciences of the Chinese Academy of Sciences(GrantNo.QYZDJ-SSW-SLH020)+1 种基金the Strategic Priority Research Program(B)of the Chinese Academy of Sciences(Grant No.XDB07030200)the National Natural Science Foundation of China(Grant Nos.11574365,11474349,11674385,11404380,91436101,and 61275060)
文摘The ultrafast laser-excited magnetization dynamics of ferromagnetic （FM） La0.67Sr0.33MnO3 （LSMO） thin films with BiFeO3 （BFO） coating layers grown by laser molecular beam epitaxy are investigated using the optical pump-probe technique. Uniform magnetization precessions are observed in the films under an applied external magnetic field by measuring the time-resolved magneto-optical Kerr effect. The magnetization precession frequencies of the LSMO thin films with the BFO coating layers are lower than those of uncoated LSMO films, which is attributed to the suppression of the anisotropy field induced by the exchange interaction at the interface between the antiferromagnetic order of BFO and the FM order of LSMO.
文摘目的探究无创诊断对儿童颅内动静脉畸形(AVM)隐匿性病变的及时精准诊断及评估价值.方法选取2017年1月至2018年12月河北省儿童医院65例疑似AVM患儿为观察组,均行MRI及3D-TOF-MT-MRA检查,比较两种检查方法图像质量、信噪比(SNR)、对比度噪声比(CNR),以数字减影血管造影(DSA)检查结果为"金标准",比较MRI、3D-TOF-MT-MRA单独及联合诊断儿童AVM的价值及评估Spetzler-Martin分级的准确性,另选取本院收治的65例AVM患儿为对照组,两组均根据术前影像学检查结果制定手术治疗方案,比较两组手术前后生活质量(PedsQLTM4.0评分)、预后情况(改良Rankin评分),随访3年,统计比较两组并发症发生率和死亡率.结果3D-TOF-MT-MRA检查的图像质量、SNR、CNR均高于MRI检查(P<0.05);MRI、3D-TOF-MT-MRA诊断儿童AVM的曲线下面积(area under the curve,AUC)分别为0.864、0.883,二者联合诊断的AUC最大,为0.939,联合诊断的敏感度、特异度、准确度分别为97.78%、90.00%、95.38%;MRI联合3D-TOF-MT-MRA评估Spetzler-Martin分级的准确度(97.78%)高于MRI单独评估(80.00%)(P<0.05),但与3D-TOF-MT-MRA单独评估的准确度(88.89%)比较,差异无统计学意义(P>0.05);两组术后PedsQLTM4.0评分均高于术前,且观察组高于对照组,mRS评分均低于术前,且观察组低于对照组(P<0.05);观察组并发症总发生率、死亡率(6.82%、4.55%)均低于对照组(22.22%、17.46%)(P<0.05).结论3D-TOF-MT-MRA联合MRI诊断儿童AVM能有效提高诊断敏感度及准确度,且在评估Spetzler-Martin分级方面具有较高可靠性,有助于及时精准判定儿童AVM病情,指导临床制定最佳治疗方法,从而改善患儿预后.
