22,456 research outputs found
Sequential Palladium-Catalyzed Allylic Alkylation/retro-Dieckmann Fragmentation Strategy for the Synthesis of α-Substituted Acrylonitriles.
A straightforward synthesis of α-substituted acrylonitriles is described using 4-cyano-3-oxotetrahydro-thiophene (c-THT) as an acrylonitrile surrogate. This unprecedented two-step sequence featuring a palladium-catalyzed allylic alkylation (Pd-AA) and a retro-Dieckmann fragmentation provides a general entry into diversely substituted 1,4-dienes
Performance optimization of a leagility inspired supply chain model: a CFGTSA algorithm based approach
Lean and agile principles have attracted considerable interest in the past few decades. Industrial sectors throughout the world are upgrading to these principles to enhance their performance, since they have been proven to be efficient in handling supply chains. However, the present market trend demands a more robust strategy incorporating the salient features of both lean and agile principles. Inspired by these, the leagility principle has emerged, encapsulating both lean and agile features. The present work proposes a leagile supply chain based model for manufacturing industries. The paper emphasizes the various aspects of leagile supply chain modeling and implementation and proposes a new Hybrid Chaos-based Fast Genetic Tabu Simulated Annealing (CFGTSA) algorithm to solve the complex scheduling problem prevailing in the leagile environment. The proposed CFGTSA algorithm is compared with the GA, SA, TS and Hybrid Tabu SA algorithms to demonstrate its efficacy in handling complex scheduling problems
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High-contrast Polarimetry Observation of the T Tau Circumstellar Environment
We conducted high-contrast polarimetry observations of T Tau in the H-band,
using the HiCIAO instrument mounted on the Subaru Telescope, revealing
structures as near as 0.\arcsec1 from the stars T Tau N and T Tau S. The
whole T Tau system is found to be surrounded by nebula-like envelopes, and
several outflow-related structures are detected in these envelopes. We analyzed
the detailed polarization patterns of the circumstellar structures near each
component of this triple young star system and determined constraints on the
circumstellar disks and outflow structures. We suggest that the nearly face-on
circumstellar disk of T Tau N is no larger than 0.\arcsec8, or 117 AU, in the
northwest, based on the existence of a hole in this direction, and no larger
than 0.\arcsec27, or 40 AU, in the south. A new structure "N5" extends to
about 0.\arcsec42, or 59 AU, on the southwest of the star, believed to be
part of the disk. We suggest that T Tau S is surrounded by a highly inclined
circumbinary disk with a radius of about 0.\arcsec3, or 44 AU, with a
position angle of about 30, that is misaligned with the orbit of the T
Tau S binary. After analyzing the positions and polarization vector patterns of
the outflow-related structures, we suggest that T Tau S should trigger the
well-known E-W outflow, and is also likely to be responsible for a southwest
precessing outflow "coil" and a possible south outflow
Gangs and guilt: Towards a new theory of horror film
The most basic and unanimous statement made in scholarship on horror films is that horror films are ‘about’ fear: the primary purpose of horror films is to scare viewers. Based on horror films from the 1970s until the present in which child gangs play a significant part, this essay advances a new theory of horror film, namely that horror films primarily seek to elicit not fear but guilt. The analysis focuses on four topics: themes, camera angles, horror’s cinematic casting of ‘abnormality,’ and the rift, unique to the horror genre, between audience ‘alignment’ and ‘allegiance.
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