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| 1 | INFLUENCE OF LOCAL BRITTLE ZONE ON THE FRACTURETOUGHNESS OF HIGH-STRENGTH LOW-ALLOYEDMULTIPASS WELD METALS显示文摘In this paper, toughness properties and microstructurc of low-alloyed multipass welds with yield strength above 700MPa have 6een studied using the weld thermal simulation and throughout thickness CTOD fracture mechanics tests. Impact testing of thermal simulated specimens showed that the primary weld metal and the fine gmmed weld metal had good toughness, while the coarse grained weld metal had the lowest toughness value as the local brittle zone (LBZ) in multipass weld metals. Cleavage fracture in CTOD testing of thick multipass weld metals was initiated from martensite-austenite (MA) phases in the LBZ. MA phases were distributed at the prior austenite grain boundaries and around ferrite grains. As the size of the local brittle zone along the fatigue crack front increases, CTOD frncture toughness of multipass weld metals decreases. The weakest link theory was used to evaluate effect of the local brittle zone on fracture toughness of thick multipass weld metals. The estimated curves agree well with the eaperimental data. | Z.L.Zhou S.H.Liu | 1998 | Acta Metallurgica Sinica(English Letters)1998，11，2： | 1 |
| 2 | EFFECT OF HYDROGEN BONDING ON DIRECTION OF PHOTOISOMERIZATION OF RETINOIDS:THE ORIGIN OF THE SOLVENT POLARITY EFFECT.显示文摘Studies of direction of photoisomerization of retinal,retinonitrile,a-retinonitrile and a trienenitrile analog in different solvents with varying wave-lengths of excitation and reaction temperature led to the conclusion that the wellknown solvent dependent photochemistry of retinoids is due to selective excitation ofthe hydrogen bonded species. | Bao-wen ZHANG Robert S.H.LIU Department of Chemistry,2545 The Mall University of Hawaii,Honolulu,HI 96822 U.S.A. | 1991 | Chinese Chemical Letters1991，2，1： | 0 |
| 3 | 奇A核的多声子γ振动带实验研究进展显示文摘对于近年来清华大学与美国合作研究组在原子核结构实验研究中有关奇A核的多声子γ振动带方面的进展进行了评述。研究人员通过有效的国际合作,识别了质量数A=100丰中子核区的奇A核103Nb,105Mo,107Tc和109Tc中的两声子γ振动带,这是迄今为止国际上在奇A核的结构研究中发现的仅有的4例这样的结构。对于实验方法、研究结果以及这些多声子γ振动带的特性进行了评述,并对目前在多声子带其他方面的研究及今后进一步的工作进行了概述。 | 朱胜江 J.H.Hamilton A.V.Ramayya 王建国 丁怀博 顾龙 J.K.Hwang K.Li S.H.Liu N.T.Brewer Y.X.Luo J.O.Rasmussen I.Y.Lee 徐强 杨韵颐 肖志刚 李红洁 马文超 | 2013 | 原子核物理评论2013，30，2： | 0 |
| 4 | Derimorphisms over Algebras and Applications显示文摘The new concept'derimorphism'generalizing both derivation and homomor-phism is defined.When a derimorphism is invertible,its inverse is a Rota-Baxter operator.The general theory of derimorphism is established.The classification of all derimorphisms over an associative unital algebra is obtained.Contrary to the nonexistence of nontriv-ial positive derivations,it is shown that nontrivial positive derimorphisms do exist over any pair of opposite orderings over R[x],the lattice-ordered full matrix algebra and upper triangular matrix algebra over a totally ordered field. | X.Cao S.H.Liu X.S.Lu Z.J.Ye Z.R.Yu Y.H.Zhang | 2023 | Algebra Colloquium2023，30，2： | 0 |
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