The 1-2-3 Conjecture for Hypergraphs

A weighting of the edges of a hypergraph is called vertex-coloring if the weighted degrees of the vertices yield a proper coloring of the graph, i.e., every edge contains at least two vertices with different weighted degrees. In this paper we show that such a weighting is possible from the weight set {1,2,...,r+1} for all hypergraphs with maximum edge size r>3 and not containing edges solely consisting of identical vertices. The number r+1 is best possible for this statement. Further, the weight set {1,2,3,4,5} is sufficient for all hypergraphs with maximum edge size 3, up to some trivial exceptions.Comment: 12 page

O\u27Neal v. Hudson, 133 Nev. Adv. Op. 29 (June 1, 2017)

If a party timely sends a motion for new trial directly to the presiding judge in an email, then that motion is properly filed and will toll the time available to file a notice of appeal so long as: (1) the presiding judge allows the motion to be filed with that judge; and, (2) the presiding judge accepts the motion within the required time-period

Office of the Attorney General v. Justice Court (Escalante), 133 Nev. Adv. Op. 12 (Apr. 6, 2017)

The Court determined that NRS 30.130, which concerns the Attorney General’s right to be notified and an opportunity to be heard in constitutional challenges to Nevada statutes, does not apply to criminal proceedings. Instead, NRS 30.130 only refers to a proceeding for declaratory relief, which is treated as a civil action

Diffusion of innovation: Technology in the high school journalism classroom

Society is undoubtedly influenced by technology. Although some people may not be ready or willing to admit it, technological innovations will continue to play an increasingly prominent role in organizational systems and in all business, social and personal relationships. A snapshot of American society shows that 43 percent of homes have a personal computer (Pew, 1999) and nearly 45 million homes have online access (Iconocast, 2000). One cannot help but recognize that technology is transforming part of everyday life for many people. But not everyone is an equal participant in this cultural transformation and not everyone agrees that technological literacy is the correct goal

Removing surface accretions with piezo-excited high-frequency structural waves

Unwanted accretions on structures are a common machinery maintenance problem, which can pose a serious safety threat if not treated effectively and punctually. In this paper we investigate the capability of piezo-excited structural waves for invoking delamination of accreted material from waveguides. We apply a wave-based technique for modelling piezoelectric excitation based on semi-analytical finite elements to model the interface shear stress associated with piezo-actuated structural waves. As a proof of concept, we present a demonstration experiment in which patches of material are removed from a beam-like waveguide with emulated anechoic terminations using ultrasonic excitation.<br/

Wave propagation in rods with an exponentially varying cross-section - modelling and experiments

In this paper we analyse longitudinal wave propagation in exponentially tapered rods from both a theoretical and an experimental perspective. The tapering introduces significant changes to the behaviour of the rod. The longitudinal wave does not propagate from zero frequency, its cut-off frequency depending on the coefficient in the exponent. The analytical description of this phenomenon is well established, however little experimental workhas been published to date. After a brief review of the classical solution of the exponential rod equation, we derive a methodology allowing the wavenumbers to be estimated from a set of equally spaced dynamic responses. Our approach is verified numerically against a finite element simulation and validated experimentally, both showing very good agreement. To further explain the results and provide an outlook for future work, we present a finite element model of the tapered rod embedded in an infinite solid medium. We conclude with a discussion on the effects of the surrounding medium on the behaviour of the structure and resulting characteristicfeatures of the wavenumber

Der Kontrakt der Arbeit bei wissensintensiven Dienstleistungen

"Der Beitrag beginnt mit einer Annäherung an das Konzept der postfordistischen Arbeitsregulation und plädiert dafür, die Regulation wissensintensiver Dienstleistungsarbeit aus der Vertragsperspektive zu betrachten. Er setzt sich mit der Kategorie Wissensarbeit sowie der Verbreitung dieses Arbeitstyps auseinander und begreift Projektorganisation als Merkmal postfordistischer Produktion. Es folgen Kapitel zur Kontraktualisierung von Wissensarbeit in und jenseits von Normalarbeitsverhältnissen. Gegenstand des Schlusskapitels sind Voraussetzungen und Perspektiven postfordistischer Arbeitsregulation. Es kommt zu dem Ergebnis, dass die postfordistische Regulationsweise eine Stärkung von Individualrechten verlangt und durch Metaregeln gekennzeichnet ist." (Autorenreferat)"The paper approaches post-fordist work regulation and proposes to analyse the regulation of knowledge work from the perspective of contract relations. It discusses the concept and quantitative extent of knowledge work, and regards project-organisation as a characteristic feature of the post-fordist production mode. The article deals with contract relations of knowledge work within and beyond the standard employment conditions. Subsequently, the terms and perspectives of work regulation in the post-fordist era are examined. Finally the paper argues that the post-fordist mode of work regulation requires a strengthening of the rights of individuals and is characterised by metarules." (author's abstract