$ D.L*
,
D.N.He
,
X.J.Bao
,
Y. Q.Zhang
,
X. Y.Ruan
,
J.L. Cheng and J. Y. Jiang 1) National Die & Mold CAD Engineering Research Center
,
Shanghai Jiaotong University
,
Shanghai 200030
,
China 2) Shanghai Volkswagen Automotive Company Limited
,
Shanghai 201805
,
China
金属学报(英文版)
With the combination of a new theoretical formula, physical simulation experiments, the technology of artificial neural network and database, an intelligent system for the prediction of sheet metal drawing capability is constructed for the first time. A modified criterion for sheet metal drawing capability is proposed in this paper, namely, the Technological Limiting Drawing Ratio, TLDR = f(R, n, s, t, F, μ,r_d,r_p…). Based on the studies of other scholars, a new formula is derived to predict the TLDR in this paper. Then a series of orthogonal physical simulation experiments are designed to investigate the effect of technological parameters on the TLDR, and the results are analyzed in the paper. Then the predicting system is constructed with the combination of the theoretical formula, orthogonal experiments, the technology of artifocial neural network and database. The predicted results show good agreements with experimental data, so it can be used to avoid the blindness in the selection of sheet metal before stamping. The system operates under the Windows operating system, and it supports the mechanism of Client/Server as well as Intranet, so the system has high engineering value.
关键词:
TLDR
,
null
,
null
,
null
,
null
,
null
,
null
曹会英
,
刘广东
,
刘家荣
原子核物理评论
doi:10.3969/j.issn.1007-4627.2007.04.004
基于SU(3)夸克模型,用共振群方法研究了两种理论下的∑-N相互作用,得到了它们的相互作用非定域位以及∑超子与3He壳心核的相互作用势,并在此基础上计算了4∑He基态结合能.计算结果表明,SU(3)夸克模型能较好地描述两种理论下的∑-N相互作用及∑超子与3He壳心核的相互作用势,同时由其得到的4∑He基态结合能也与实验值基本相吻合.
关键词:
SU(3)手征夸克模型
,
共振群
,
非定域位
,
结合能
尹君
,
岳古明
,
徐贲
量子电子学报
doi:10.3969/j.issn.1007-5461.2006.02.015
使用脉冲Nd:YAG四倍频激光抽运充有纯D2气体和D2/He混合气体的拉曼池.实验研究了受激拉曼散射的能量转换效率和能量稳定性与系统主要参量,包括抽运光能量、D2气体压强和加入惰性气体He的关系.实验表明,适量惰性气体He的加入在没有降低一阶斯托克斯散射光(S1,波长:289.04 nm)能量稳定性的前提下,有利于提高其能量转换效率,最大能量转换效率达到22.1%.通过实验分析,得到了受激拉曼散射一阶斯托克斯散射光的能量转化效率和能量稳定性的优化条件.
关键词:
非线性光学
,
受激拉曼散射
,
四波混频
,
能量转换效率
,
能量稳定性
胡义华
,
刘美希
,
陈丽
,
王小涓
,
储焰南
,
曹德兆
量子电子学报
doi:10.3969/j.issn.1007-5461.2001.04.008
本文在流动余辉装置上,研究了亚稳态He(23S)原子与N2H4分子碰撞传能,观察到了激发态产物NH(A3II→X3∑+)、NH(c1II→a1△)、NH2(A2A1→X2B1)的发射光谱,由相对光谱强度求得了形成各产物的通道比;分析NH(A3II,v＇=0)的转动分辨谱的结果表明,v＇=0能级上的转动布居是"双模”分布,激发态产物NH(A)、NH2(A)的形成机理可能是: He(23S)+N2H4→N2H4*→NH(A)+NH2(A)+H.
关键词:
碰撞传能
,
化学发光
,
NH(A3Ⅱ)的发射光谱
ZHANG Lei WANG Peixuan TAO Rong MA Ruzhang ZHANG Guoguang University of Science and Technology Beijing
,
Beijing
,
China professor
,
Department of Materials Physics.University of Science and Technology Beijing.Beijing 100083
,
China
金属学报(英文版)
Nucleation and growth of He bubbles at different annealing temperatures T≤1023 K in stain- less steels HR-2 and SS321,implanted with He~+(40-70 keV.1×10~(16)-6× 10~(17) He~+/cm~2),were ohserved under TEM.T=0.45T_m seems to be a transition temperature.The He bubbles continue mainly their nucleation at 0.3T_m< T<0.45T_m,and grow predominantly at T≥0.45T_m,due probably to migration and coalescence by surface diffusion of metal atoms around the bubbles.The apparent activation energies for the growth are found to he 0.41 and 0.31 eV for HR-2 and SS321 respectively.The bubble density in HR-2 is greater than that in SS321 within whole measuring temperature range,and the onset temperature of rapid swelling is also higher.It is believed that the resistance of HR-2 to He is superior to that fo SS321.
关键词:
stainless steel
,
null
,
null
,
null
,
null
Journal of Nuclear Materials
Due to its inert reactivity with almost elements, He-3 produced from tritium decay has extremely detrimental effects on the tritide. To refrain from this He-3-induced damage, an efficient way is to increase the stability of He-3 in metal tritide by alloying. Using a first-principles discrete variational method in two cluster models, one for a low He-3 concentration and the other for a high He-3 concentration, the authors study the alloying effect of 3d and 4d transition metals on the stability of He-3 in TiT2 system. It is found that the preferring and metastable sites of He-3 are affected by He-3 concentration : He-3 prefers to stay at original tetrahedral interstitial site when He-3 concentration is low but moves to octahedral site when He-3 concentration is high enough. A criterion of alloying effect is proposed, according to which Nb, Y, Zr, Pd, Ru, Tc, Rh, Cr, Mo and Ag are suggested to be the beneficial alloying elements for increasing the stability of He-3 in the alloyed TiT2 with a low He-3 concentration and Y, Nb, Mo, Zr, Cr, Tc, Ru, Rh and Cu for that with a high He-3 concentration. Our results of alloying effect are supported by the positron annihilation spectroscopy (PAS) measurements for He-implanted Ti, TiMoYAl and TiZrYAl films. (c) 2006 Elsevier B.V. All rights reserved.
关键词:
electronic population analysis;molecular wave functions;hydrogen;storage alloys;intermetallic hydride;bubble formation;iron clusters;helium;tritides;lcao;overlap
仇晓龙
,
吴玉新
,
张海
,
吕俊复
工程热物理学报
本文采用一维湍流模型（ODT）对氦气平面羽流和CH_4/H_2/N_2射流火焰进行数值模拟,和前人的实验结果进行定量地对比。结果表明,ODT模型能够准确地预测平面羽流基本特征,湍流涡团的分布同流场拉伸率之间具有密切的关系,涡团强度的分布能够直观地表明当地的湍流强度。ODT模型埘CH_4/H_2/N_2瞬态火焰的模拟定性反应了火焰特性及其与湍流作用的规律,对温度-混合分数的预测值和实测值进行比较,发现甲烷火焰燃烧在富燃料侧并未达到平衡状态,因而基元反应对火焰特性的预测具有重要作用。
关键词:
一维湍流模型(ODT)
,
平面羽流
,
甲烷射流火焰
