1,721,265 research outputs found
Yan Huagu shi ji
No full text嚴粲述.綫裝.附《蒙齋袁先生手帖》, 《詩緝清濁音圖》, 《十五國風地理圖》.《詩緝清濁音圖》後鐫"趙府栞于居敬堂"刊記.框20.2 x 14.3公分, 9行18字, 小字雙行同, 白口, 四周雙邊, 單綫魚尾. 版心上鐫"味經堂", 中鐫書名及卷次.鈐: "沙羡邾", "藏之名山傳之其人", "明上谷鶴林梁氏藏書記", "臣樟私印", "秋崖子朱克生".Xian zhuang.Fu "Meng zhai Yuan xian sheng shou tie", "Shi ji qing zhuo yin tu", "Shi wu guo feng di li tu"."Shi ji qing zhuo yin tu" hou juan "Zhao fu kan yu ju jing tang" kan ji.Kuang 20.2 x 14.3 gong fen, 9 hang 18 zi, xiao zi shuang hang tong, bai kou, si zhou shuang bian, dan xian yu wei. Ban xin shang juan "Wei jing tang", zhong juan shu ming ji juan ci.Qian: "Sha yi zhu", "Cang zhi ming shan zhuan zhi qi ren", "Ming shang gu he lin liang shi zang shu ji", "Chen zi si yin", "Qiu ya zi mi ke sheng".Yan Can shu
Going Beyond Counting First Authors in Author Co-citation Analysis
Full text linkThe present study examines one of the fundamental aspects of author co-citation analysis (ACA) - the way co-citation
counts are defined. Co-citation counting provides the data on which all subsequent statistical analyses and mappings
are based, and we compare ACA results based on two different types of co-citation counting - the traditional type that
only counts the first one among a cited work's authors on the one hand and a non-traditional type that takes into
account the first 5 authors of a cited work on the other hand. Results indicate that the picture produced through this non-traditional author co-citation counting contains more coherent author groups and is therefore considerably clearer. However, this picture represents fewer specialties in the research field being studied than that produced through the traditional first-author co-citation counting when the same number of top-ranked authors is selected and analyzed. Reasons for these effects are discussed
Variations on the Author
Full text link“Variations on the Author” discusses two of Eduardo Coutinho’s recent films (Um Dia na Vida, from 2010, and Últimas Conversas, posthumously released in 2015) and their contribution to the general question of documentary authorship. The director’s filmography is characterized by a consistent yet self-effacing form of authorial self-inscription: Coutinho often features as an interviewer that rather than express opinions propels discourses; an interviewer that is good at listening. This mode of self-inscription characterizes him as an author who is not expressive but who is nonetheless markedly present on the screen. In Um Dia na Vida, however, Coutinho is completely absent form the image, while Últimas Conversas, on the contrary, includes a confessional prologue that moves the director from the margins to the center of his films. This article examines the ways in which these works stand out in the filmography of a director who offers new insights into the notion of cinematic authorship
Nanopillar array film of cellular cobalt by wet etching of the grain boundaries
Full text linkA straightforward strategy was developed for the fabrication of cobalt thin films made of a dense array of vertically aligned nano and / or meso-crystals. Briefly, the proposed process consists in the electrodeposition of columnar cobalt thin films followed by a selective wet-etch treatment. Based on a preliminary screening of either aqueous or methanol based acid etchants, either a nitric acid or methanesulfonate methanol solution was further considered. The degree of selectivity of the etching solutions was evaluated on the basis of the observation of film surface/cross section morphology before and after etching. Contrary to water-based solutions methanol-based solutions showed definitely a degree of selectivity toward grain boundary preferential etching. In particular, with methanesulfonic acid (MSA)- methanol solution, saturation of the etchant with oxygen was found to have a profound effect in improving the control of the etching process. Accordingly, an 11.2% methanol-based {MSA} solution was able to selectively etch the Co layer at the grain boundaries, leaving Co individual crystals separated by nanochannels
Appropriate Similarity Measures for Author Cocitation Analysis
Full text linkWe provide a number of new insights into the methodological discussion about author cocitation analysis. We first argue that the use of the Pearson correlation for measuring the similarity between authors’ cocitation profiles is not very satisfactory. We then discuss what kind of similarity measures may be used as an alternative to the Pearson correlation. We consider three similarity measures in particular. One is the well-known cosine. The other two similarity measures have not been used before in the bibliometric literature. Finally, we show by means of an example that our findings have a high practical relevance.information science;Pearson correlation;cosine;similarity measure;author cocitation analysis
Direct growth of MWCNTs on 316 stainless steel by chemical vapor deposition: Effect of surface nano-features on CNT growth and structure
No full textMulti-walled carbon nanotubes were directly grown by chemical vapor deposition on as received or pretreated 316 SS without application of an external catalyst. A detailed study of the size distribution of surface features formed by different steps of the synthesis process showed that the heating cycle and any complementary pretreatment may produce significant changes of the surface topography, thus suggesting that the influence of any
primary characteristics of the original surface, as well as those caused by a pretreatment, should be assessed in conjunction with the effects of heating. Average lateral size of nano-features less than 60 nm (after heating) were shown to favor mainly the carbon
nanotube growth while a larger features size was associated predominantly to the carbon nanofiber synthesis. Scanning and transmission electron microscopy observations suggest two different mechanisms for nanotube/nanofiber growth: (1) base growth mode caused by nanosized hills on the surface catalyzing the nanotube/nanofiber synthesis, (2) tip growth mode requiring substrate surface break-up as a preliminary step to form catalytic particles, with similarities to the ‘‘metal dusting’’ mechanisms. While untreated steel showed the best results concerning carbon nanotube coverage and homogeneity, oxidized-reduced samples showed an almost exclusive growth of carbon nanofibers with a full coverage
Effects of CVD direct growth of carbon nanotubes and nanofibers on microstructure and electrochemical corrosion behavior of 316 stainless steel
Full text linkIn this work, the corrosion behavior of three differently treated AISI 316 stainless steel plates is investigated, viz. (1) pristine, (2) coated with a carbon nanotube (CNT) layer and (3) coated with a carbon nanofiber (CNF) layer.CNTs andCNFswere directly grown on stainless steel via a CVD
method, using ethylene as the carbon source and without the addition of an external catalyst. The corrosion behavior of these materials was investigated by a combination of microstructural and electrochemical methods. Electrochemical tests included potentiodynamic and potentiostatic techniques in hot sulfuric acid solutions. A strong deterioration in corrosion resistance was revealed by the electrochemical tests and confirmed by microstructural examination of the samples. It was found that carbon diffusion into the substrate material during the CNT/CNF growth process results in chromium depletion of the near-surface region of 316 SS and chromiumcarbide precipitation at grain boundaries causing accelerated intergranular corrosion. Accordingly, notwithstanding the obvious inability of CNT/CNF layers to provide protection to the substrate due to their porous nature, a real corrosion damage arises from the high temperature exposure of stainless steel to the CVD atmosphere, suggesting that a similar risk may be present even for compact carbon coating deposited by CVD process, in the event of local damage of the coating
Supercapacitor electrodes by direct growth of multi-walled carbon nanotubes on Al: a study of performance versus layer growth evolution
Full text linkSupercapacitor electrodes were fabricated by direct growth of multi-walled carbon nanotubes (CNTs) on Al current collectors via a chemical vapor deposition process in the presence of a spin-coated Co-Mo catalyst. A detailed study of the dependence of the CNT layer structure and thickness on growth time set the basis for the assessment of supercapacitors assembled with the CNTs/Al electrodes. As the main features of the layer growth evolution, an increase in the population of finer CNTs and a shift from a random entanglement to a rough vertical alignment of nanotubes were noted with proceeding growth. The growth time influence on the performance of supercapacitors was in fact apparent. Particularly, the specific capacitance of CNTs/Al electrodes in 0.5 M K2SO4 aqueous electrolyte increased from 35 to 80 F g-1 as the CNT layer thickness varied from 20 to 60 mm, with a concurrent loss in rate capability (knee frequency from 1 kHz to 60 Hz). The latter was excellent in general, arguably due to both a fast ion transport through the interconnected CNT network and a negligible contribution of the active layer/current collector contact to the equivalent series resistance (0.15–0.22 mV g), a distinct advantage of the direct growth fabrication method. Overall, a relatively simple process of direct growth of CNTs on Al foils is shown to be an effective method to fabricate supercapacitor electrodes, notably in the absence of special measures and processing steps finalized to a tight control of nanotubes growth and organization
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