1,347 research outputs found
Economics of joint production and implications for the media and cultural industries: The necessity of application and research
This article addresses an issue of joint production arising from the media and cultural industries. Joint production is a production process that yields two or more products simultaneously. In the media and cultural industries, the application of digital technology has made it possible for producers to generate products both online and offline, therefore, a common production process can yield outcome for multiple platforms. This changing feature has brought with it many implications – from the managerial perspective, it has altered economic rationales guiding managers’ decision making on whether or not to cease production on the traditional platforms. The current study explores why different types of analysis are required in the joint production. This study introduces the concepts of shut-down, split-off and tipping points that need to be considered. The authors also propose an approach of timeline analysis that may move the investigation of joint production forward for the next steps
Matrix Infinitely Divisible Series: Tail Inequalities and Applications in Optimization
In this paper, we study tail inequalities of the largest eigenvalue of a
matrix infinitely divisible (i.d.) series, which is a finite sum of fixed
matrices weighted by i.d. random variables. We obtain several types of tail
inequalities, including Bennett-type and Bernstein-type inequalities. This
allows us to further bound the expectation of the spectral norm of a matrix
i.d. series. Moreover, by developing a new lower-bound function for
that appears in the Bennett-type inequality, we derive
a tighter tail inequality of the largest eigenvalue of the matrix i.d. series
than the Bernstein-type inequality when the matrix dimension is high. The
resulting lower-bound function is of independent interest and can improve any
Bennett-type concentration inequality that involves the function . The
class of i.d. probability distributions is large and includes Gaussian and
Poisson distributions, among many others. Therefore, our results encompass the
existing work \cite{tropp2012user} on matrix Gaussian series as a special case.
Lastly, we show that the tail inequalities of a matrix i.d. series have
applications in several optimization problems including the chance constrained
optimization problem and the quadratic optimization problem with orthogonality
constraints.Comment: Comments Welcome
Melaminium perchlorate monohydrate
In the title hydrated salt, 2,4,6-triamino-1,3,5-triazin-1-ium perchlorate monohydrate, C3H7N6
+·ClO4
−·H2O, the constituents are linked via hydrogen bonds of the O—H⋯O, N—H⋯O, N—H⋯N and N—H⋯Cl types. All the H atoms of the melaminium cation are involved in the hydrogen bonds. The melaminium residues are interconnected by four N—H⋯N hydrogen bonds, forming chains parallel to (111). The ribbons are interconnected by other hydrogen bonds as well as by π–π interactions [centroid–centroid distance = 3.8097 (7) Å]
Fabrication of Large-Grain Thick Polycrystalline Silicon Thin Films via Aluminum-Induced Crystallization for Application in Solar Cells
The fabrication of large-grain 1.25 μm thick polycrystalline silicon (poly-Si) films via two-stage aluminum-induced crystallization (AIC) for application in thin-film solar cells is reported. The induced 250 nm thick poly-Si film in the first stage is used as the seed layer for the crystallization of a 1 μm thick amorphous silicon (a-Si) film in the second stage. The annealing temperatures in the two stages are both 500°C. The effect of annealing time (15, 30, 60, and 120 minutes) in the second stage on the crystallization of a-Si film is investigated using X-ray diffraction (XRD), scanning electron microscopy, and Raman spectroscopy. XRD and Raman results confirm that the induced poly-Si films are induced by the proposed process
Dense Polarized Positrons from Laser-Irradiated Foil Targets in the QED Regime
Dense positrons are shown to be effectively generated from laser-solid
interactions in the strong-field quantum electrodynamics (QED) regime. Whether
these positrons are polarized has not yet been reported, limiting their
potential applications. Here, by QED particle-in-cell simulations including
electron-positron spin and photon polarization effects, we investigate a
typical laser-solid setup that an ultraintense linearly polarized laser
irradiates a foil target with m-scale-length preplasma. We find that once
the positron yield becomes appreciable with the laser intensity exceeding
, the positrons are obviously polarized. The polarized
positrons can acquire polarization degree and nC charge with a
flux of . The polarization relies on the deflected
angles and can reach 60\% at some angles and energies. The angularly-dependent
polarization is attributed to the asymmetrical laser fields positrons undergo
in the skin layer of overdense plasma, where the radiative spin-flip and
radiation reaction play significant roles. The positron polarization is robust
and could generally appear in future 100-PW-class laser-solid experiments for
various applications.Comment: 6 pages, 5 figures, with Supplemental Materia
Identification of a novel submergence response gene regulated by the Sub1A gene
Submergence is one of the major constraints to rice production in many rice growing areas in the world. The Sub1A gene has been demonstrated to dramatically improve submergence tolerance in rice. Here, we report the identification of a novel submergence response (RS1) gene that is specifically induced in the Sub1A-mediated submergence tolerance response. Under submergence, RS1 was upregulated in M202 (Sub1A) but downregulated in M202 in RNA-seq and microarray assays. Expression analyses of various tissues and developmental stages show that RS1 mRNA levels are high in leaves and sheaths, but low in roots, stems, and panicles. Our results also show that RS1 is highly expressed under submergence, drought, and NaCl stresses, but not under cold or dehydration stress. Hormone ABA treatment induces, whereas GA treatment decreases, RS1 expression. The RS1 and Sub1A genes are co-regulated under submergence. Overexpression of RS1 in transgenic Kitaake (without Sub1A) and M202(Sub1A)×Kitaake do not result in enhanced submergence tolerance. Conversely, down-regulation of RS1 in M202(Sub1A)×Kitaake lead to weaken submergence tolerance. We hypothesize that RS1 may play a role in the Sub1A-mediated submergence tolerance pathway.Key word: Rice (Oryza sativa L.), submergence, RNA-seq, Sub1A, abiotic stress
Economics of joint production and implications for the media and cultural industries: The necessity of application and research
This article addresses an issue of joint production arising from the media and cultural industries. Joint production is a production process that yields two or more products simultaneously. In the media and cultural industries, the application of digital technology has made it possible for producers to generate products both online and offline, therefore, a common production process can yield outcome for multiple platforms. This changing feature has brought with it many implications – from the managerial perspective, it has altered economic rationales guiding managers’ decision making on whether or not to cease production on the traditional platforms. The current study explores why different types of analysis are required in the joint production. This study introduces the concepts of shut-down, split-off and tipping points that need to be considered. The authors also propose an approach of timeline analysis that may move the investigation of joint production forward for the next steps
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