Media and Entrepreneurship, A Revisit with a Decade of Progress: A Bibliometric Analysis of Media Entrepreneurship Research Between 2005 and 2017

Purpose: This article is for the purpose of presenting a continued observation on the research of media and entrepreneurship. Media and entrepreneurship have strong relevance to each other—on the one hand, essential characteristics of entrepreneurship including innovation and novel ways of content creation are crucial in building media business success; on the other hand, media play a vital role in promoting an entrepreneurial spirit, by transmitting values and images ascribed to it—this special relationship has been examined a decade ago by an earlier study conducted by this author. Well past the time of media industry development and landscape transformation, much progress has been made since then, it is highly worthwhile to revisit the topic and to identify changes in the field. Therefore, the current article presents a continued study, it aims at observing the status quo of the field of media entrepreneurship research and proposing an agenda for future development. Methodology: The study was conducted by a bibliographic analysis on the scholarly work published between 2005 and 2017. Findings from the study indicate growing interests in the research of media and entrepreneurship. The field of inquiries is getting to be more mature, with the progress made on the fundamental conceptual building. In the existing literature, innovation has been a central topic for study, and entrepreneurial journalism was emerged as a new focal issue; meanwhile, use of social media to promote entrepreneurship has also attracted close academic attention. Findings/Contribution: The study provides practical implications to media entrepreneurs and social implications to promote entrepreneurship spirit through traditional and new media platforms. The article also contributes original value to understanding the intrinsic linkage between media and entrepreneurship

Interesting identities involving weighted representations of integers as sums of arbitrarily many squares

In this paper, we obtain formulas for the number of representations of positive integers as sums of arbitrarily many squares (and other polygonal numbers) with a certain natural weighting. The resulting weighted sums give Fourier coefficients of weight two quasimodular forms

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 $Q(s)=(s+1)\log(s+1)-s$ 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 $Q(s)$. 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

Effects of different fertilizers on methane emission from paddy field of Zhejiang, China

No Abstract

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 $\mu$m-scale-length preplasma. We find that once the positron yield becomes appreciable with the laser intensity exceeding $10^{24}~\rm W/\rm cm^2$, the positrons are obviously polarized. The polarized positrons can acquire $>30\%$ polarization degree and $>30$ nC charge with a flux of $10^{12}\,{\rm sr}^{-1}$. 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