张昕
,
张玉虎
,
周小红
,
郭文涛
,
郭松
,
郭应祥
,
M.Oshima
,
Y.Toh
,
M.Koizimi
,
A.Osa
,
A.Kimura
,
Y.Hatsukawa
,
T.Morikawa
,
M.Nakamura
,
M.Sugawara
,
H.Kusakari
,
T.Komatsubara
,
K.Furuno
原子核物理评论
对~(149)Sm(~(27)Al,4n)~(172)Re反应产生的~(172)Re在束γ的实验数据进行了重新分析,新发现了可归属于~(172)Re的3个转动带,由此建立了由6个转动带构成的~(172)Re高自旋态能级纲图.依据相邻核的带结构知识和推转壳模型分析方法,对新发现的3个转动带的准粒子组态进行了指定,讨论了它们的转动特征.
关键词:
转动带
,
二准粒子组态
,
准粒子顺排
,
双奇核(172)~Re
张玉虎
,
王华磊
,
周小红
,
柳敏良
,
M.Oshima
,
Y.Toh
,
M.Koizimi
,
A.Osa
,
A.Kimura
,
Y.Hatsukawa
,
T.Morikawa
,
M.Nakamura
,
M.Sugawara
,
H.Kusakari
,
T.Komatsubara
,
K.Furuno
原子核物理评论
doi:10.3969/j.issn.1007-4627.2004.04.015
利用149Sm(27Al, 4nγ)172Re反应布居了形变双奇核172Re的高自旋态, 用12套带有BGO反康普顿抑制的高纯锗探测器阵列进行了在束γ实验测量, 首次建立了172Re由3个转动带构成的高自旋态能级纲图. 研究和讨论了3个转动带的结构特征, 基于已有的高自旋态核结构知识并通过系统学比较和分析指出它们的准粒子组态分别为πh11/2(○)νi13/2,πh9/2 (○)νi13/2和(○)π1/2-[541](○)ν1/2-[521]. 发现前两个转动带在自旋小于18时其转动能级呈现反常的旋称劈裂.
关键词:
在束γ谱学
,
双奇核172Re
,
转动带
,
旋称反转
段沐枫
,
李宁
,
郑莹莹
,
肖军
,
李勇
宇航材料工艺
K-cor是应用Z-pin增强技术的一种新型高性能结构.本文以NHZP-1树脂为基体研究适合K-cor结构的半固化Z-pin拉挤工艺,得到固化度为51.25%的Z-pin为满足制备要求的最佳参数,并制作悬空装置采用两步法进行半固化Z-pin的植入和压弯,探索出压弯和后固化工艺.在此基础上,对试制的K-cor夹层结构进行平拉和剪切试验研究.结果发现,折弯长度是K-cor夹层结构的另一重要参数,较长的折弯长度会增加Z-pin与蒙皮的结合面积从而提高结构的拉伸性能.
关键词:
复合材料
,
半固化Z-pin
,
K-cor夹层结构
,
制备工艺
,
力学性能
陈篪
金属学报
本文证明我们所建议的关系: (da/dN)-C[(△K)~2-K_2~2/K_1~2-(△K)~2]~p能够很好地表达R=(K_(min)/K_(max))=常数时(da/dN)随△K的全部变化,其中P值在1左右,C约在3×10~(-3)—10~(-2)毫米/周之间。
关键词:
Materials Letters
Single crystals of K-doped blue bronze Rb0.15K0.15MoO3 and Rb0.3MoO3 have been investigated by measurements of the X-ray photoemission spectrum (XPS), electrical resistivity and thermoelectric power, respectively. Analysis of the XPS data reveals that two final states representing alternate screening channels coexist in Rb0.15K0.15MoO3. Compared with the pure bronze, the Mo sites of the doped sample contain less 4d electrons which reflected in the movement of Mo3d spectrum. Due to the discrepancy of electronic structure, the K ion doping results in the notable increase of the single particle activation energy and decrease of the thermoelectric power in the charge density wave state. (C) 2007 Elsevier B.V. All rights reserved.
关键词:
blue bronze;charge-density-wave;electronic structure;nonlinear transport;k0.30moo3;tl0.3moo3;k0.3moo3;moo3
稀土学报(英文版)
Cyclic oxidation test is a fundamental method to assess lifetime of materials in high temperature environment. Cycle length or cyclic frequency is one important variable in cyclic oxidation testing. In present work, cyclic oxidation tests were performed on cast K38 alloys with 0 wt.%, 0.1 wt.%, and 0.5 wt.% yttrium additions at 1 273 K respectively. Two cyclic frequencies were used to investigate the influence of cycle length (1 h vs. 20 h) on the high temperature oxidation behavior of superalloy. The results showed that the degradation of cast K38 alloy critically was dependent on the cyclic frequency. The yttrium addition was beneficial to reducing scale-growth rate, improving the scale adhesion and stress releasing, thereby increased the spallation resistance. It could be drawn that the effect of cyclic frequency was highly dependent on the scale adherence to the substrate.
关键词:
K38 superalloy;yttrium;cyclic oxidation;cyclic frequency;rare earths;high-temperature oxidation;adhesion;segregation;scales;spallation;chromia;alloys;growth;oxides
Physics Letters A
Except for a Peierls transition at T(p) = 180 K, a new transition around T = 270 K in K0.3MoO3 single crystals has been found as evidenced by the anomalies in electrical, magnetic and thermodynamic properties. This transition may be caused by the variation of carrier characteristics or of the charge transfer between cations and anions.
关键词: