1,454 research outputs found
The effects of solder volume and Cu concentration on the consumption rate of Cu pad during reflow soldering
No full textMicrostructure and mechanical properties of duplex tiAl alloys containing Mn
No full textA study has been made of the effect of Mn on the structure and compressive mechanical properties of duplex TiAl alloys. In order to clarify the separate effect of Mn and Al contents, the effect of Ti/Al ratio was also studied by analyzing the behavior of alloys with different Ti/Al ratios at the fixed Mn content. Addition of 3 at.% Mn to the binary Ti53Al47 alloy decreases the tetragonality and the unit cell volume of γ structure. It also promotes the formation of twin-related structure, the refinement of interlamellar spacing and grain size, and the increase in the volume fraction of lamellar grains. Increase in Ti/Al ratio at the fixed Mn content results in the further decrease in the tetragonality and unit cell volume and the refinement of grain size, while it decreases the volume fraction of lamellar grains. The modification of microstructure directly influences the compressive properties and deformation mode of duplex TiAl alloys. It has been found that Mn addition and increase in Ti/Al ratio enhance the plasticity of duplex alloys. Generation of mobile dislocations at the twin intersections has been found to occur in Mn containing alloys. Such dislocation generation at the twin intersections as well as the promotion of deformation twins in Mn containing alloys are all beneficial for improving the ductility of duplex TiAl alloys. © 1995 Springer.117Nscopu
Effect of strain on the crystallization kinetics of bulk amorphous alloys
No full textIn the present study, the effect of strain on the crystallization kinetics of the Vit-1 bulk amorphous alloy in supercooled liquid state has been investigated using thermal analysis (DTA), dilatometer and EXAFS. It shows that strain induces the structural disordering at initial stage of straining, increasing the resistance to crystallization. On the other hand, there is an increase in the degree of short range ordering with annealing time. These short-range ordered regions can act as pre-existing nuclei, accelerating the crystallization kinetics. These opposing effects of strain and annealing controls the crystallization kinetics of the alloy strained in supercooled liquid state.115Nsciescopu
SiC vs. Si: two-dimensional analysis of quasi-saturation behavior of DMOS devices operating at elevated temperatures
No full textSixteen Conjoined Divination Inscriptions of the Huang Group
No full text甲骨卜辭綴合促使辭例訊息本身的完整性，亦得以逐漸拼湊出甲骨原樣。本文以卜辭黃組為例，搜羅近來綴合成果共十六則；關於卜辭黃組時代，大抵在帝乙、帝辛時期，此時亦以龜腹甲、胛骨為主要占卜之物，本文十六則綴合中，二例屬龜腹甲，其餘十四例則為胛骨之綴合。且其中五組是在前人的基礎上進行加綴，另外十一組則為本人所新綴，過程中並懷疑前人的一則誤綴，文內將此誤綴的兩版，再重新與其他二版進行綴合。Conjunction of divination inscriptions on oracle bones not only contributes to the completeness of inscription decipherment but also helps to restore oracle bones to their original appearances. The inscriptions of the Huang Group approximately date from the reign of Di Yi and Di Xin [Emperors Yi and Xin], when tortoise plastrons and animals’ scapulae are the main divination tools. This article collects sixteen recently conjoined divination inscriptions of the Huang Group; two of them are incised on tortoise plastrons and the other fourteen on animals’ scapulae. Five of them are the author’s additions to previous scholarly works, while the other eleven are newly conjoined by the author. During the process of conjoining, the author discovers that two divination inscriptions have mistakenly been pieced together by previous scholars and therefore re-conjoins them with other two inscriptions
Fifteen Oracle Bone Inscriptions on Conjoined Scapulae
No full text今所見商代甲骨卜辭，基本以刻在龜甲、胛骨為主。本文以胛骨為範圍，共綴合十五則，其中四則屬第一期的賓組卜辭；另十一則歸於第五期的黃組卜辭，內容涉及卜旬，以及田獵的材料。而十五組中，二組則是在前人的基礎上再行加綴，其餘則為本文新綴。This article interprets fifteen divination writings incised in conjoined animals’ scapulae, two of which are pieced together by former scholars and the other thirteen by the author. Four of the writings belong to the Bin Group of the First Phase, which covers the reign of King Wu Ding; the other eleven belong to the Huang Group of the Fifth Phase, which covers the reign of Emperors Yi and Xin. These divination inscriptions predict the results of hunting activities and the activities’ influences on the balance of nature within the following ten days. Animals’ scapulae and tortoise plastrons are the two primary materials of the Shang Dynasty oracle bones unearthed so far
The Development and Use of Electronic Newspapers
No full textWWW版電子報的超文件、超連結及多媒體的特性和傳統報紙大不相同，除了省去報紙儲存空間、立即的電子新聞傳送、提供個人化報紙外，還提供資料庫檢索的功能。從資料使用的觀點來看，內容龐雜的報紙資料經整理建立資料庫後，將方便資料的保存及查詢。本文將就電子報的定義、特色及發展做一初步探討。The features of hypertext , hyperlink and multimedia of WWW version electronic newspaper are very different from those of traditional newspapers. Electronic newspaper not only provides database searching but also saves a great amount of storage space . You can have the immediate delivery of electronic news which can be individualized. In terms of the usage of information, it will facilitate the information searching and preservation after building database from newspapers whose contents are various. This article will discuss preliminarily the definition , features and development of electronic newspaper
Interfacial Reaction Between 95Pb-5Sn Solder Bump and 37Pb-63Sn Presolder in Flip-Chip Solder Joints
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