Digital Commons Network^™

Van Der Waals Universe With Adiabatic Matter Creation, Emil Prodanov, Rossen Ivanov

Articles

A FRWL cosmological model with perfect fluid comprising of van der Waals gas and dust has been studied in the context of dynamical analysis of a three-component autonomous non-linear dynamical system for the particle number density $n$, the Hubble parameter $H$, and the temperature $T$. Perfect fluid isentropic particle creation at rate proportional to an integer power $\alpha$ of $H$ has been incorporated. The existence of a global first integral allows the determination of the temperature evolution law and hence the reduction of the dynamical system to a two-component one. Special attention is paid to the cases of $\alpha = …

Surface Waves Over Currents And Uneven Bottom, Alan Compelli, Rossen Ivanov, Calin I. Martin, Michail D. Todorov

Articles

The propagation of surface water waves interacting with a current and an uneven bottom is studied. Such a situation is typical for ocean waves where the winds generate currents in the top layer of the ocean. The role of the bottom topography is taken into account since it also influences the local wave and current patterns. Specific scaling of the variables is selected which leads to approximations of Boussinesq and KdV types. The arising KdV equation with variable coefficients, dependent on the bottom topography, is studied numerically when the initial condition is in the form of the one soliton solution …

Riemann-Hilbert Problem, Integrability And Reductions, Vladimir Gerdjikov, Rossen Ivanov, Aleksander Stefanov

Articles

Abstract. The present paper is dedicated to integrable models with Mikhailov reduction groups G_R ≃ D_h. Their Lax representation allows us to prove, that their solution is equivalent to solving Riemann-Hilbert problems, whose contours depend on the realization of the G_R-action on the spectral parameter. Two new examples of Nonlinear Evolution Equations (NLEE) with D_h symmetries are presented.

Does It Take Three To Dance The Tango? Organizational Design, Triadic Structures And Boundary Spanning Across Subunits, Stefano Tasselli, Alberto Caimo

Articles

In this paper, we investigate the processes of boundary spanning across subunits within organizational networks. We hypothesize that patterns of advice across organizational subunits are explained by different triadic mechanisms depending on the organizational design of the intra-organizational network. In organizational networks characterized by flat hierarchy, we found triadic cyclic closure to be positively associated to boundary spanning across subunits; but when the network reflects an organizational structure with formal hierarchical differentiation among members, then we found triadic transitive closure to be associated to boundary spanning across subunits. We test these predictions in two empirical studies consisting of two organizational …

On The Cosmological Models With Matter Creation, Emil M. Prodanov, Rossen Ivanov

Articles

The matter creation model of Prigogine--Géhéniau--Gunzig--Nardone is revisited in terms of a redefined creation pressure which does not lead to irreversible adiabatic evolution at constant specific entropy. With the resulting freedom to choose a particular gas process, a flat FRWL cosmological model is proposed based on three input characteristics: (i) a perfect fluid comprising of an ideal gas, (ii) a quasi-adiabatic polytropic process, and (iii) a particular rate of particle creation. Such model leads to the description of the late-time acceleration of the expanding Universe with a natural transition from decelerating to accelerating regime. Only the Friedmann equations and the …

On The Time-Evolution Of Resonant Triads In Rotational Capillary-Gravity Water Waves, Rossen Ivanov, Calin I. Martin

Articles

We investigate an effect of the resonant interaction in the case of one-directional propagation of capillary-gravity surface waves arising as the free surface of a rotational water flow. Specifically, we assume a constant vorticity in the body of the fluid which physically corresponds to an underlying current with a linear horizontal velocity profile. We consider the interaction of three distinct modes and we obtain the dynamic equations for a resonant triad. Setting the constant vorticity equal to zero we recover the well known integrable three-wave system.

Injective Tensor Products Of Tree Spaces, Milena Venkova, Christopher Boyd, Costas Poulios

Articles

We study tensor products on tree spaces; in particular, we give necessary and sufficient conditions for the n-fold injective tensor product of tree spaces to contain a copy of l_1.

Benjamin-Ono Model Of An Internal Wave Under A Flat Surface, Alan Compelli, Rossen Ivanov

Articles

A two-layer uid system separated by a pycnocline in the form of an internal wave is considered. The lower layer is infinitely deep, with a higher density than the upper layer which is bounded above by a at surface. The uids are incompressible and inviscid. A Hamiltonian formulation for the dynamics in the presence of a depth-varying current is presented and it is shown that an appropriate scaling leads to the integrable Benjamin-Ono equation.

A Multilayer Exponential Random Graph Modelling Approach For Weighted Networks, Alberto Caimo, Isabella Gollini

Articles

A new modelling approach for the analysis of weighted networks with ordinal/polytomous dyadic values is introduced. Specifically, it is proposed to model the weighted network connectivity structure using a hierarchical multilayer exponential random graph model (ERGM) generative process where each network layer represents a different ordinal dyadic category. The network layers are assumed to be generated by an ERGM process conditional on their closest lower network layers. A crucial advantage of the proposed method is the possibility of adopting the binary network statistics specification to describe both the between-layer and across-layer network processes and thus facilitating the interpretation of the …

On The Reidemeister Spectrum Of An Abelian Group, Brendan Goldsmith, Fatemeh Karimi, Noel White

Articles

The Reidemeister number of an automorphism ϕ of an Abelian group G is calculated by determining the cardinality of the quotient group G/(ϕ − 1G)(G), and the Reidemeister spectrum of G is precisely the set of Reidemeister numbers of the automorphisms of G. In this work we determine the full spectrum of several types of group, paying particular attention to groups of torsion-free rank 1 and to direct sums and products. We show how to make use of strong realization results for Abelian groups to exhibit many groups where the Reidemeister number is infinite for all automorphisms; such groups then …

Using Drawings To Understand Perceptions Of Civic Engagement Across Disciplines: ‘Seeing Is Understanding’, Sharon Feeney, John Hogan

Articles

In this article, we wish to investigate if disciplinary differences exist among students when considering the topic of civic engagement. We use freehand drawing to create a learning environment in the classroom wherein students can seek to develop meaningful associations with civic engagement. The drawings examined here, produced by three different class groups, provide insights into how young adults perceive their society and their place in it, and thus communicate their understanding of civic engagement. Freehand drawing, in bypassing cognitive verbal processing routes, leads students to produce clearer and more holistic images. It allows them to put into visuals a …

Spent Coffee Waste As A Potential Media Component For Xylanase Production And Potential Application In Juice Enrichment, Rajeev Ravindran, Gwilym Williams, Amit Jaiswal

Articles

In this study, spent coffee waste (SCW) was used as the sole carbon source for xylanase production in solid state fermentation mode using Aspergillus niger. A Box–Behnken design was constructed using three parameters viz. temperature, initial moisture content, and log number of sporestodeterminetheoptimalfermentationcondition. Thebestfermentationconditionsforxylanase productionwerefound to beincubation at30◦Cwith aninitial moisture contentof 70%and usingan inoculum of 6.5×106 spores/g of dry SCW. Furthermore, the design of experiments revealed that maintaining a medium composition of 0.2 g of yeast extract, 0.04 g of K2HPO4, and 0.03 g of MgSO4 increased xylanase production. Under optimised solid-state fermentation conditions an enzyme activity of 6495.6 IU/g …

(E)-6,6′-(Diazene-1,2-Di­Yl)Bis­(1,10-Phenanthrolin-5-Ol) Tri­Chloro­Methane Disolvate: A Superconjugated Ligand, Muhib Ahmed, Michael Devereux, Vickie Mckee, Malachy Mccann, A. Denise Rooney

Articles

Phenanthroline ligands are important metal-binding mol­ecules which have been extensively researched for applications in both material science and medicinal chemistry. Azo­benzene and its derivatives have received significant attention because of their ability to be reversibly switched between the E and Z forms and so could have applications in optical memory and logic devices or as mol­ecular machines. Herein we report the formation and crystal structure of a highly unusual novel diazo-diphenanthroline compound, C24H14N6O2·2CHCl3.

Targeting Lipoprotein Biogenesis: Considerations Towards Antimicrobials, Toufic El Arnaout, Tewfic Soulimane

Articles

Decades have passed without approval of a new antibiotic class. Several companies have recently halted related discovery efforts because of multiple obstacles. One promising route under research is to target the lipoprotein maturation pathway in light of major recent findings and the virulence roles of lipoproteins. To support the future design of selective drugs, considerations and priority-setting are established for the main lipoprotein processing enzymes (Lgt, LspA, and Lnt) based on microbiology, biochemistry, structural biology, chemical design, and pharmacology. Although not all bacterial species will be similarly impacted by drug candidates, several advantages make LspA a top target to pursue …

Effect Of Cold Plasma Treatment On The Antigenicity Of Peanut Allergen Ara H 1, Harshitha Venkataratnam, Chaitanya Sarangapani, Orla Cahill, Catherine Barry-Ryan

Articles

The objective of this study was to investigate the effects of cold atmospheric plasma on the antigenicity of protein Ara h 1. Dry, defatted peanut flour (DPF), whole peanut (WP) were subjected to cold atmospheric plasma at voltage of 80 kV for different treatment durations (0, 15, 30, 45 and 60 min). The allergen samples were analyzed using SDS-PAGE, immunoblot and competitive ELISA. Furthermore, the secondary structure was examined using circular dichroism. SDS-PAGE results revealed no change in the protein intensity bands corresponding to Ara h 1 for both DPF and WP. Competitive ELISA of samples showed a reduction in …

Evaluation Of Brewer's Spent Grain Hydrolysate As A Substrate For Production Of Thermostable Α-Amylase By Bacillus Stearothermophilus, Rajeev Ravindran, Gwilym A. Williams, Amit Jaiswal

Articles

In the present study, BSG was hydrolysed using cellulolytic enzymes and used as a growth medium supplement for cultivation of the thermophilic bacterium, Bacillus stearothermophilus in the production of α-amylase. A central composite design involving five parameters and four levels viz. starch, peptone, KCl, and MgSO4 along with BSG hydrolysate was used to derive the optimal media composition. The fermentation was conducted using shake flasks for 36 h at a temperature of 50 °C and pH 7.0 at 220 rpm. Optimization trials revealed that maximal amylase production (198.09 U/ml) occurred with a medium composition of starch (0.2% w/v), peptone (0.2% …

Beyond Bitcoin: Leveraging Blockchain To Benefit Business And Society, Rachel Epstein, Marcia Narine Weldon

Articles

No abstract provided.

Discrimination Of Breast Cancer From Benign Tumours Using Raman Spectroscopy, Fiona Lyng, Damien Traynor, Thi Nguyet Que Nguyen, Aidan Meade, Fazle Rakib, Rafif Al-Saady, Erik Goormaghtigh, Khalid Al-Saad, Mohamed H. Ali

Articles

Breast cancer is the most common cancer among women worldwide, with an estimated 1.7 million cases and 522,000 deaths in 2012. Breast cancer is diagnosed by histopathological examination of breast biopsy material but this is subjective and relies on morphological changes in the tissue. Raman spectroscopy uses incident radiation to induce vibrations in the molecules of a sample and the scattered radiation can be used to characterise the sample. This technique is rapid and non-destructive and is sensitive to subtle biochemical changes occurring at the molecular level. This allows spectral variations corresponding to disease onset to be detected. The aim …

Seasonal Variability Of Sediment Controls Of Carbon Cycling In An Agricultural Stream, Sophie Comer-Warner, Daren Gooddy, Sami Ullah, Luke Glover, Aishling Percival, Nicholas Kettridge, Stefan` Krause

Articles

Streams and rivers are‘active pipelines’where high rates of carbon (C) turnover can lead to globally importantemissions of carbon dioxide (CO2) and methane (CH4) from surface waters to the atmosphere. Streambed sedi-ments are particularly important in affecting stream chemistry, with rates of biogeochemical activity, and CO2and CH4concentrations far exceeding those in surface waters. Despite an increase in research on CO2and CH4instreambed sediments there is a lack of knowledge and insight on seasonal dynamics. In this study the seasonallyvariable effect of sediment type (sand-dominated versus gravel-dominated) on porewater C cycling, includingCO2and CH4concentrations, was investigated. We found high concentrations of CO2and CH4in the …

A Platform Approach In Solution Business: How Platform Openness Can Be Used To Control Solution Networks., Ruiqi Wei, Susi Geiger, Roisin Vize

Articles

This paper explores how customer solution providers leverage digital platform architectures and particularly platform openness to exert control over complex organizational networks. A multiple case-study approach studies three companies with digital platforms that orchestrate solution networks in the LED and ICT industries. Our findings show that the features of product modules (core or peripheral), service modules (relationship intensity and customization), and knowledge modules (explicit, tacit and codified) have differential influence on the levels of platform openness. By managing platform openness of different subsystems accordingly, the solution providers can achieve different control benefits, including ensuring module quality, increasing offering variety, reducing …

Politics, Governance, And Leadership: What Can We Learn From The Academy Of Management’S Response To Eo13769?, Gerald Davis, Michel Anteby, Forrest Briscoe, P. Devereux Jennings, Samina Karim, Aseem Kaul, Sergio Lazzarini, Banu Ozkazanc-Pan, Paul Donnelly, Andreas Rasche, Anne S. Tsui, Thomas A. Wright, Todd R. Zenger

Articles

Organization design seeks to balance potentially conflicting objectives while achieving a broader mission. EO13769 created a challenge for the president of the Academy of Management in leading through these conflicts, as President Anita McGahan describes: how to be true to her own moral values while leading an organization with well-established design constraints, and members with diverse opinions. This article shares the perspectives of 12 scholars on the lessons we can learn from Professor McGahan’s leadership of a constraining organization through a challenging time.

Emotional Intelligence And Conflict Management Styles, Helen Chen, Xuemei Xu, Patrick Phillips

Articles

Purpose – This paper aims to use a multi-level approach to examine the effects of emotional intelligence (EI) components on conflict management styles of Chinese managers when the respondents were in conflicts with their subordinates, peers or superiors.

Design/methodology/approach – The primary research was conducted in Dalian, China, via a personal survey resulting in 885 usable observations for analysis. EI was measured using the Wong and Law Emotional Intelligence Scale (WLEIS; Wong and Law, 2002), which is made up of 16 questions measuring four dimensions. The conflict management component was measured via Rahim’s (1983) five conflict management styles, which are …

The Moderation Effect Of Social Factors On Marketing Factors In Consumer Research, Xiaochuang Wu, Helen Chen, Xiaohong Li

Articles

Consumer research tends to isolate the impact of marketing and social factors. Little has been done to include both. This paper aimed to find out what would happen when these two sets of factors are included. Two models were built in this paper, Model I with the marketing factors only and Model II with both the marketing and social factors. Data was collected in Ireland among more than 1473 transition year students in a personal survey regarding their willingness to learn Chinese. Data were analysed by using structural equation modelling (SEM). Results showed the two social variables, acculturation and intergenerational …

Agents Of Change: Using Transformative Learning Theory To Enhance Courses In Business Ethics And Social Entrepreneurship, Christina C. Benson, Gary R. Palin, Thomas M. Cooney, Kathleen Farrell

Articles

How can we catalyze “entrepreneurial thinking” and cultivate a deeper understanding of social responsibility and sustainability in business education? Academic scholars have begun to explore the key characteristics and origins of an “entrepreneurial mindset” through new streams of research in the areas of “entrepreneurial cognition” and “design thinking”. Similarly, modern scholarship on “sustainable business” and “creating shared value” has offered a new sense of direction for research on social responsibility. If only a simple lecture or power point presentation could convey all the real-world complexities involved in actually creating shared value, or in effectively balancing “people, planet and profits.” If …

The New Agriculture: From Food Farms To Solar Farms, Jessica Owley, Amy Wilson Morris

Articles

Across the United States, government agencies and energy developers are looking to agricultural land for development of renewable energy. One attraction of agricultural lands is that they are already relatively ecologically impaired compared with the previous solar development sites in the California and Arizona desert that have been a major source of concern for many environmental groups-and subject to expensive mitigation requirements under the Endangered Species Act. Renewable energy development pressures are accelerating the existing loss of agricultural land, heightening concerns about food security and the economic viability of agricultural communities. California farmland is at the center of this conflict. …

Craft Beer And The Rising Tide Effect: An Empirical Study Of Sharing And Collaboration Among Seattle’S Craft Breweries, Zahr K. Said

Articles

This qualitative empirical research project studies Seattle’s craft brewing industry as a thriving entrepreneurial ecosystem that displays widespread collaboration and innovation. Drawing on data collected in 22 face-to-face formal interviews conducted with industry participants, the Article explores the community’s attitudes, practices, and norms with respect to collaboration and intellectual property (IP). It joins a growing body of qualitative empirical IP scholarship that maps misalignments between law and practice “on the ground,” seeking to offer a more accurate and pluralistic account of an innovative industry. The craft brewing community in Seattle cooperates extensively while continuing to compete actively for consumers. In …

A Few Grains Of Incense: Law, Religion, And Politics From The Perspective Of The "Christian" And "Pagan" Dispensations, Paul Horwitz

Articles

No abstract provided.

Don't Reject Federal Prosecutors' Role In Criminal Justice Reform Crimfest 2019, Joyce Vance

Articles

No abstract provided.

The Clear And Present Dangers Of The Clear And Present Danger Test: Schenck And Abrams Revisited, Ronald J. Krotoszynski Jr.

Articles

From March 3 1919 to November 10 1919 Justice Oliver Wendell Holmes's understanding of the First Amendment underwent a transformation In Schenck Debs and Frohwerk all decided in March 1919 Justice Holmes authored majority opinions that embraced a "bad tendencies" test as the constitutional standard required to regulate "“ or even proscribe entirely "“ political speech that includes a call to unlawful action Although Holmes used the language of a "clear and present danger" these decisions applied a very deferential standard of review and did not require the government to prove beyond a reasonable doubt the probability of political speech …

Associations And Cities As (Forbidden) Pure Private Attorneys General, Heather Elliott

Articles

The Supreme Court interprets Article III's case-or-controversy language to require a plaintiff to show injury in fact, causation, and redressability. A plaintiff who meets that tripartite test has standing to sue and thus a personal stake in pursuing the litigation. Accord- ingly, in Sierra Club v. Morton, the Supreme Court prohibited pure private attorneys general: litigants who would sue without the requisite personal stake. This limitation extends to organizations. They, too, must show standing on their own account or, under Hunt v. Washington Apple Advertising Commission, identify a member with Article Ill standing and show how the lawsuit is germane …