The 〈 110 〉 -oriented TTb0.3Dy0.7Fe1.95 polycrystalline alloy was magnetically annealed, and its influence on jump effect of magnetostriction was investigated. In the vacuum superconductive high magnetic field equip...The 〈 110 〉 -oriented TTb0.3Dy0.7Fe1.95 polycrystalline alloy was magnetically annealed, and its influence on jump effect of magnetostriction was investigated. In the vacuum superconductive high magnetic field equipment, 〈 110 〉 -oriented Tb0.3Dy0.7Fe1.95 polycrystalline alloy of the directional solidification was annealed at 623 and 723 K for 5 min under the magnetic field vertical to specimen axis. It is found that magnetic annealing can enhance the jump effect under compressive stress, and increase the saturated magnetostriction coefficient λs, the λs of the magnetic annealing specimens at 623 K under 8.1 MPa is attained to 1950 × 10^-6, Magnetic annealing increases the maximum of dynamic magnetostriction coefficient, d33^max, as well as the magnetic field for d33^max under 8.1 MPa.展开更多
文摘目的分析伴或不伴载体动脉狭窄(parental artery stenosis,PAS)的急性皮层下单发梗死(single subcortical infarction,SSI)患者的临床特征差异,探究此类SSI患者疾病严重程度和短期预后的影响因素。方法回顾性纳入北京协和医院2012年1月至2021年12月收入院的符合急性SSI且临床影像资料完整的患者318例,其中男217例,女101例,中位年龄63岁。收集患者人口学信息、脑血管病危险因素、美国国立卫生研究院卒中量表(national institute of health stroke scale,NIHSS)评分、改良Rankin量表(modified Rankin score,mRS)评分、住院时间、实验室检查结果、入院前治疗情况、梗死病灶分布等资料。根据血管影像上梗死灶相关载体动脉是否存在狭窄,将患者分为伴PAS组和不伴PAS组,比较两组患者上述临床特征的差异。采用多元线性回归分析SSI患者入院时NIHSS评分的影响因素,采用多因素二分类Logistics回归分析患者早期预后不良(mRS评分≤2分)的影响因素。结果318例患者中不伴PAS患者224例,伴PAS者94例。两组在一般人口学资料、脑血管病危险因素、急性期实验室检查、梗死病灶分布、入院和出院时NIHSS评分、入院和出院时mRS评分、入院前治疗情况、住院天数等比较差异均无统计学意义(均P>0.05)。多因素回归分析显示,伴或不伴PAS不是SSI患者入院时NIHSS评分和早期不良预后的影响因素(均P>0.05),而女性(OR=2.156,P=0.039)、发病年龄大(OR=1.023,P=0.046)和入院时NIHSS评分高(OR=1.333,P<0.001)是SSI患者早期不良预后的独立危险因素。结论伴或不伴PAS的SSI患者可能存在共同的动脉粥样硬化基础,伴PAS可能并不影响此类患者疾病严重程度和早期预后,提示全面评估PAS以外的潜在动脉粥样硬化机制对于SSI的精准治疗至关重要。
文摘The 〈 110 〉 -oriented TTb0.3Dy0.7Fe1.95 polycrystalline alloy was magnetically annealed, and its influence on jump effect of magnetostriction was investigated. In the vacuum superconductive high magnetic field equipment, 〈 110 〉 -oriented Tb0.3Dy0.7Fe1.95 polycrystalline alloy of the directional solidification was annealed at 623 and 723 K for 5 min under the magnetic field vertical to specimen axis. It is found that magnetic annealing can enhance the jump effect under compressive stress, and increase the saturated magnetostriction coefficient λs, the λs of the magnetic annealing specimens at 623 K under 8.1 MPa is attained to 1950 × 10^-6, Magnetic annealing increases the maximum of dynamic magnetostriction coefficient, d33^max, as well as the magnetic field for d33^max under 8.1 MPa.
