1,721,131 research outputs found
Microstructure 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
Applying Interview Approach to Study the Users' Satisfaction of “National Electronic Archival Retrieval” System
No full text「全國檔案目錄查詢網」係為使用者查詢政府檔案資訊的重要管道，惟該查詢網在設計開發階段，並未進行使用者之測試作業，了解使用者之使用意見，且該查詢網自正式開放以來，其使用人次統計數據的成長率並無明顯變化，故本文指在以訪談方式深入了解使用者使用全國檔案目錄查詢網的原因、經驗、評價及建議等，並據以評估系統是否需要改善，以及可能的改善空間。 "National Electronic Archival Retrieval" system is an important channel for users to retrieve government information. However, there are no user's surveys during its testing period, and the usage rate doesn't increase significantly. It is necessary to understand the users' satisfaction with this system. This study proceeds with interviews, approaches to find out the users' usages, opinions and suggestions, and thus evaluates the system and its improvements
A Reappraisal of ？ and Related Characters in the Oracle Bone Script and Bronze Script
No full text關於甲骨卜辭「 」字，學者說法繁多，本文一一檢討前人意見，歸結此字實為樹梢枝條柔弱之形，蓋即「梢」的本字，據此通讀卜辭「今(來） 」為「今(來）朝」，意為「今天(來日）的早晨」。並進而討論甲骨、金文「 」、「 」字，吳振武、陳劍等人以「 」為彤沙之「沙」，其根據甲骨 、 具有文例相同的現象，推論此字為「沙」得聲，因此通假為「殺」、「翦」等字，但本文認為此字為形聲字，從「 」得聲，即「梢」聲，讀為「翦」，屬宵元通轉，無需視為「沙」聲。文中亦針對前人「 (捷）」字考訂進行反思，認為此字與本文「 」字，在字形、音理確實存在關聯，但置於金文句例時則未可通，原因在於早期文獻的「捷」字屬不及物動詞，金文中則該通讀作「略」或「折」。文中並略述「翦」、「捷」、「截」於音理上存在關聯，但置於文獻時則需依照各字使用情形予以合適的解說。最後，文末並輔以甲骨、楚簡等出土文獻的相關材料以證成本文的論說。Regarding the interpretations of the character in oracle bone script, scholars have contributed significant theories. In this essay, past interpretations are reviewed with the conclusion that this character is the shape of a soft branch. In other words, it is the original form of shao (梢, the top of a tree). If we read the oracle bones with such interpretation, then “jin (lai) (now come ) should be read as “jin lai chao” today (tomorrow) morning. If we continue to examine and in oracle bone script and bronze script, according to Wu Zhen-wu and Chen Jian, should stand for sand in red sand (彤沙—tong sa. According to oracle bone script , there were similar phenomena in its usage regarding the character . It is deduced that this character should be pronounced as “sa” and people borrowed this word and used it as to kill (殺sa) and cut (翦 jian). However, this essay suggests that it is a picto-phonetic character. It should be pronounced as , i.e. shao and articulated as jian (翦). In ancient times, the character “shao” (宵) and “yuan” (元) were interchangeable. It is not necessary to pronounce it as sha (沙). In this essay, the former scholars’ interpretations of the word (jie 捷) are reexamined as well. It is suggested that there were association in both form and sound between and . However, a problem is encountered when applying such interpretations in deciphering bronze script because in early documents, the word jie (捷) was an intransitive verb. In bronze script, it should be read as lue (略) or zhe (折). This essay also discusses the association among the characters jian (翦), jie (捷), and zhe (截) in their pronunciations. However, they should be pronounced differently in accordance with documents’ contexts. Finally, the appendixes of oracle bone script and unearthed documents such as chu jian (楚簡) bamboo script in the Kingdom of Chu are attached as evidence
- …
