1,720,993 research outputs found
Synthesis, structure and magnetic properties of Mn-12 single molecule magnet containing 4-(methylthio)benzoate as peripheral ligands
No full text[Mn12O12(O2CPh-4-SMe)(16)(H2O)4](.)7CH(2)Cl(2)(1), a new single-molecule magnet complex has been successfully synthesized by substitution of acetate ligand of Mn12ac with 4-(methylthio)benzoic acid. Complex 1 crystallizes into triclinic P (1) over bar with a = 18.321(3) angstrom, b = 19.011(3) angstrom, c = 27.230(4) angstrom, alpha = 86.973(3)degrees, beta = 76.919(3)degrees, gamma = 87.613(3)degrees, and Z = 2. In complex 1, one Mn(III) ion has an abnormal Jahn-Teller elongation axis oriented at an oxide ion. Complex 1 has two out-of-phase ac susceptibility peaks in the 2-4 K and 4-7 K regions. Effective anisotropy energy barrier and pre-exponential factor are U-eff = 45.95 K, 1/tau(0) = 8.6 x 10(9) s(-1) for chi(M)" peaks in the lower temperature region and U-eff = 59.45 K, 1/tau(0)= 2.2 x 10(8) s(-1) for chi(M)" peaks in the higher temperature region. The parameters of S = 10, g = 1.87, D = -0.40 cm(-1), and E = 0.00034 cm(-1) were obtained from the M/N mu(B) vs. H/T plot of complex 1
Determination of an optimal configuration of operating policies for Direct-Input-Output manufacturing systems using the Taguchi method
No full textSome modem manufacturing systems have workstations directly integrated with a centralized storage and handling system for work-in-process. We consider a Direct-Input-Output manufacturing system(DIOMS) which has a number of machine centers placed along a built-in automated storage/retrieval system(AS/RS). The storage/retrieval(S/R) machine handles parts placed on pallets for the machine centers located at either one or both sides of the AS/RS. This paper investigates the operational aspect of DIOMS by the Taguchi method. Four operating policies including input sequencing control. dispatching rule for the S/R machine, machine center-based part type selection rule, and storage assignment policy are treated as design factors. For the performance characteristics, mean flow time and throughput are adopted. The number of machine centers, the number of part types, demand rate, processing time and the rate of each part type. vertical and horizontal speed of the S/R machine, and the size of a local buffer in the machine centers am considered as noise factors in generating various DIOMS environments. A robust design experiment with inner and outer orthogonal arrays are conducted by computer simulation, and an optimal configuration of operating policies is presented which consists of a combination of the level of each design factor. The validity of the optimal configuration is investigated by comparing its SN ratios with those obtained by an experiment with full factorial designs
Multiscale nanopatterns templated from two-dimensional assemblies of photoresist particles
No full textMultiscale nanopatterns fabricated by colloidal lithography, using two-dimensional self-assemblies of photoresist particles as masks, are presented. The colloidal masks with features of multiple length scales are obtained by photolithography and used for constructing submicrometer-hole arrays over large areas (see Figure). By depositing functional materials through these masks, nanopatterned substrates useful in a wide range of applications can be produced.National R&D Project for Nano Science and Technology of the Ministry of Commerce, Industry and Energy.
Center for Nanoscale Mechatronics and Manufacturing through the 21st Century Frontier.
Research Program (M102 KN010002–05 K1401–00214).
The BK21 and CUPS-ERC programs
Prediction of gene expression levels and the role of cis-acting elements in age-related cataract by applying a promoter-based modeling approach
Full text linkCataract is a dynamical process of lens opacity formation involving many inter- and intracellular regulations, as well as metabolic genes and transcription factors. Using a series of microarray-derived mRNA profiles for human cataractogenesis (Hawse et al. Mol. Vision 2003, 9, 515-537), we develop a promoter-based system-theoretic modeling to demonstrate model-driven prediction of gene expression levels and to identify the role of critical cis-acting elements. In this study, 14 key mRNA expression data from the structural and pathological molecules of age-related cataract samples are used. The first seven genes consist of structural molecules, and the second half of genes are composed of heat shock proteins, filensin, and glutathione peroxidase 3. The presented result demonstrates that mRNA expression levels of structural proteins such as crystallins can be successfully predicted from 5' flanking regulatory DNA sequences. In addition, predicted gene expression levels of heat shock protein, beta-tubulin, and alphaA-crystallin accurately estimate the stimulatory or inhibitory role of distributed cis-acting elements, i.e., c-Myc, GATA-1, GR, NE-E, and Pit-1. Although it is difficult to predict the overall gene expression levels in cataract samples, the present study shows the potential use of promoter-based modeling and prediction of the gene expression levels for age-related cataract
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
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
Determination of an Optimal configuration of Operating Policies for Direct-input-output Manufacturing Systems Using the Taguchi Method
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