Results 61 to 70 of about 30,586 (147)
四川大学学报. 自然科学版, 1988 原子核在俘获一个中子以后,形成复核并处于激发态,在很短的时间内发射出级联γ射线而退激。很多激发态的寿命的特征时间～10-13秒.这一特征时间与MeV能量复核的慢化时间在同一数量级内,因而复核的衰变就会影响复核的运动,即处于不同慢化阶段的运动复核其发射的γ射线的Doppler位移将不同.这就是复核γ谱的Doppler展宽.Doppler展宽的γ谱形与复核的衰变常数有关,因而复核γ谱实际上记录了激发态的衰变特性.利用这一事实便可从复核γ谱上获得复合核寿命的资料.然而目前这一方法只能对寿命的数量级进行估计 ...
罗正明, 夏宜君
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Rare Metals, Volume 45, Issue 7, July 2026.ABSTRACT The composition and structural characteristics of metacomposites are crucial for tuning their negative electromagnetic parameters; however, the lack of a clear structure–property relationship severely limits their application in dielectric and magnetic fields.
Chunyuan Deng +9 more
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Huli yanjiu, 1993 肾病综合症（简称NS）是儿科泌尿系统中较常见的疾病,其发病占第二位.近40年来,糖皮质激素一直是治疗小儿肾病综合症首选药物,多数患儿需长期服药治疗,临床上复发者较多.经过对20例小儿肾病综合症长期治疗的家庭护理调查,认为复发的原因除单纯激素治疗因素外,还与患儿家庭治疗、生活管理及家长对该病知识的了解程度有密切关系.提示了加强患儿院外治疗护理是维持住院疗效,促进患儿早日康复,防止复发的重要措施。 1 调查资料 我们对1990年以来经住院治疗临床症状缓解而出院后继续院外巩固治疗的20名患儿进行了随访调查.
樊小玲
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Shuitu Baochi Xuebao, 2022 探究矿山废弃地弃渣与农田土复配后土壤的水分蒸发特性,以及覆盖物添加对水分蒸发的影响,对矿山恢复中土壤水分管理和改善具有实际意义。以石灰岩矿山废弃地现场的弃渣和附近农田土为复配材料,设置0∶10(T1),3∶7(T2),5∶5(T3),7∶3(T4),10∶0(T5)体积比例,在野外条件下采用土柱法模拟土壤水分蒸发过程,探究复配比例对土壤水分蒸发的影响以及不同覆盖物的保水性能。结果表明:(1)试验前和试验后表层复配土壤含水量均表现为T1>T2>T3>T4>T5 ...
王佳欢 +5 more
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Rare Metals, Volume 45, Issue 7, July 2026.ABSTRACT With the development of industry, fluoride pollution has become increasingly severe. Transition metal phosphides, featuring excellent electrical conductivity and electrochemical stability, are promising electrode materials for capacitive deionization (CDI).
Pengwen Xiao +9 more
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Rare Metals, Volume 45, Issue 7, July 2026.ABSTRACT Mechanical dynamic sealing components are usually subjected to the erosion of a hydrothermal environment; thus, the selected service materials must meet stringent requirements for superior self‐lubrication, corrosion resistance, and thermal stability.
Yanchun Zhao +8 more
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Rare Metals, Volume 45, Issue 7, July 2026.ABSTRACT Laser powder bed fusion (LPBF) of Inconel 718 alloy inevitably introduces pronounced microstructural anisotropy, typified by columnar grains and robust crystallographic texture. This results in direction‐dependent fatigue behavior, raising critical reliability concerns for high‐stakes aerospace applications.
Zhifang Shi +9 more
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Zhongguo shiyan zhenduanxue肝细胞癌是全球范围内发病率和死亡率较高的恶性肿瘤。热消融术因其微创、高效的特点被广泛应用于肝细胞癌的治疗。然而，热消融术后的高复发率严重影响患者的长期生存率。超声造影不仅能够实时评估消融效果，还可通过分析增强模式监测复发风险。与 CT/MRI 对比，CEUS 时间分辨率高、灵敏度优。同时，CEUS 提示肝癌热消融后复发有诸多征象，如动脉期强化特征、消融边缘、微血管侵犯等与复发相关。此外，多模态超声造影、融合成像以及三维超声造影等新技术的出现，进一步提升了影像诊断的精准性与治疗指导能力 ...
夏永旭, 林元强, 王辉
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Rare Metals, Volume 45, Issue 7, July 2026.ABSTRACT Ti3C2Tx MXene shows significant potential in the field of electromagnetic wave absorption; however, the wave absorption performance was hindered due to the impedance mismatch, which was caused by its inherent high dielectric constant. In this work, Ti3C2Tx MXene co‐assembled with molybdenum disulfide nanosheets and carbon coating layers (MXene/
Hualong Yu +11 more
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供者淋巴细胞回输对异基因造血干细胞移植后急性白血病复发的影响
Zhongguo shiyan zhenduanxue, 2012 异基因造血干细胞移植（Allo-HSCT）是治疗急性白血病的有效手段,但移植后复发是影响治疗成功的主要因素。根据国际外周血和骨髓移植登记研究中心的资料,1998—2002年间所进行自体移植患者死亡原因中复发占75%,而HLA相同同胞供体（MSD）移植和非血缘关系供体（MUD）移植后死亡原因中复发分别为38%和32%[1 ...
郑瑞玑 +3 more
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