The chemical potential of the electron gas on a one dimensional lattice

The chemical potential of the electron gas on a one-dimensional lattice is determined within the discrete Hubbard model. The result will have applications in studies of transport properties of quasi one-dimensional organic conductors such as the Bechgaard salts.Comment: 4 pages,plain TeX,presented at the 9 National Congress of Yugoslav Physicists,held in May 1995.,and published in the proceedings.The author can be contacted at: [email protected]

Impact of prototyping resource environments and timing of awareness of constraints on idea generation in product design

Research and development laboratories in universities and firms around the world try to maximize innovation with a limited set of resources. However, questions remain about the influence of resource constraints on idea generation in early-stage product design. Multiple embedded case studies were conducted with engineering students and faculty at two university campuses in Mexico. Students developed sketches for products that would satisfy an open-ended design problem in a constrained-resource setting, where the variables were the timing of when information about these constraints was revealed, and the regular prototyping environment of the student. The evidence suggests that the timing of awareness of constraints can have an impact on design outcomes, but that this effect varies depending on the designer's regular prototyping resource environment.MIT International Science and Technology InitiativeLegatum Center for Development & Entrepreneurship (Massachusetts Institute of Technology)National Science Foundation (U.S.) (Award CMMI-1130791

Celebrity Impact on Fashion Brand Choice Using Social Media

Today social media is rapidly growing. Many social media users, specifically Instagram users, are from the Millennial generation (born between 1982 and 1999), and Generation-Z (born between 2000 and 2020) (knoema.com, 2020). They love to share their life through social media, especially by posting and viewing others’ photos and videos on Instagram. Celebrity endorsement of products and brands has shown to increase both brand awareness and sales for companies. The purpose of this study is to investigate social media influence of celebrities on consumers’ brand choices. A conceptual model is developed to investigate the influences of physical attractiveness, celebrity credibility, celebrity-brand congruence, celebrity’s activeness on social media, perceived brand credibility, and a consumers’ attitude towards the brand being endorsed and intentions to choose a celebrity-endorsed brand. The findings of this study will add knowledge to the field of celebrity endorsements on social media, with regard to the Generation-Z and Millennial generations

The affective revolution in entrepreneurship: an integrative conceptual review and guidelines for future investigation

Entrepreneurial affect has emerged as a burgeoning area of study, with a wealth of articles demonstrating that affect, broadly conceptualized, plays an important part in entrepreneurial life. While a few affective phenomena, such as passion and positive and negative affect, are primarily driving the affective revolution in entrepreneurship, a wide range of additional forms of affect, from momentary feelings to enduring affective dispositions, have been found to influence entrepreneurs’ judgements, decision-making, attitudes, and behaviors in distinct parts of the entrepreneurial process. Moreover, entrepreneurs’ affective experiences and displays of these experiences influence entrepreneurial behaviors and investors’ decision-making. Although this is an exciting time for work on entrepreneurial affect, several theoretical and empirical inconsistencies impede further knowledge accumulation. To assess how and why affect is critical to entrepreneurship, to clarify the theoretical inconsistencies, and to provide an integrative framework, we conduct a systematic review of 276 published empirical and conceptual articles on entrepreneurial affect. In doing so, we analyze how various affective phenomena (e.g., emotions, moods, sentiments), along with their discrete forms (e.g., anger, grief, happiness), influence and are influenced by specific stages of the entrepreneurial process. We conclude that while this body of research confirms that entrepreneurship is an emotional endeavor, the collective approach has thus far obscured a more detailed and useful understanding of affect in each stage of the entrepreneurial process. We examine the theoretical and empirical approaches taken to date and lay out an agenda for future scholars, thus bolstering the affective revolution in entrepreneurship

Charity Retailing in the UK: A Managerial Capabilities Perspective

Nonprofit organizations are venturing into commercial activities due to the intense competition for the limited government funds and declining availability of donor funds for third sector organizations that address social problems. Charity retailing, a popular choice of commercial activity for nonprofit organization, has filled vacant premises in the high streets of the small towns and suburbs of large cities in the UK. Successful charity retail operation requires distinctive capabilities necessary to manage organizations’ resources in commercial environment. Using sixty in-depth elite interviews, we introduce the concept of managerial capabilities for charity retailing. Research propositions and management implications are discussed

Operations management and the resource based view: another view

This paper evaluates the usefulness of the resource-based view (RBV) to the field of operations management. Based on the seminal RBV articles, we argue that using the RBV does not align with the objectives and activities of operations management researchers in several ways. First, the dependent variable in the RBV is sustained competitive advantage. Using sustained competitive advantage as a dependent variable implies that scholars focus on explaining the differences between the relatively few firms with sustained competitive advantage and all the other firms, ignoring performance variations within the great mass of firms. In addition, competitive advantage exists at the level of the business or the firm and does not directly translate into the normal level of operations management research. Measuring sustained competitive advantage also presents difficulties. Second, the explanatory variables in the RBV are resources that must be rare, valuable and hard or impossible to imitate. Measuring valuable resources or factors firms cannot imitate poses serious problems both in demonstrating value independent of the factor's impact on performance (i.e., avoiding tautology) and in measuring unique or nearly unique entities. Third, under the RBV, prescription is problematic; you cannot prescribe things that firms can readily implement because such things can be imitated. We present the practice-based view (PBV) as a simpler and better alternative for operations management where scholars attempt to explain the entire range of firm and unit performance based on transferable practices

Evolution of Entrepreneurial Judgment with Venture-Specific Experience

This study advances research on entrepreneurial cognition by investigating how entrepreneurial judgment evolves during new venture creation. We conceptualize entrepreneurial judgment as a cognitive process in the minds of entrepreneurs that operates on the causal map – i.e., a knowledge structure concerning what factors they believe will help the chances of profitability under uncertainty. At the time of initial epiphany, entrepreneurs construct a cognitive causal map which guides resource allocation decisions. Over time, venture-specific experience accumulates and entrepreneurial judgment evolves in response to their observations. Using a dataset of 524 nascent entrepreneurs, we find that entrepreneurs with more venturespecific experiences have more selective judgments, and have stronger conviction in those judgments. We also find that perceived uncertainty and cognitive dispositions of the individuals affect entrepreneurial judgment

Seeing the Forest and the Trees: Exploring the Impact of Inter- and Intra-Entrepreneurial Ecosystem Embeddedness on New Venture Creation

Research on entrepreneurial ecosystems (EEs) has tended to focus on the role that characteristics internal to the EE play in determining EE-level outcomes. Notwithstanding the insights that academics, policy-makers, and entrepreneurs have gleaned from these studies, prior research has yet to explain whether, how, and why these outcomes might also be impacted by an EE's position within the larger network of EEs. Given broad acceptance for the important role that networks play in facilitating entrepreneurship at the firm level, we contend that adopting a network-based view of EEs may also help predict and explain aggregate entrepreneurial outcomes at the EE level. Specifically, we adopt a double embeddedness lens to examine the impact of both inter-EE (i.e., structural embeddedness) and intra-EE (i.e., cultural embeddedness) factors on EE-level new venture creation. Using a longitudinal sample of regional data in the United States from 1994 to 2016, we develop and test hypotheses where the relationship between structural embeddedness and new venture creation follows an inverted "U" shape that is itself moderated by cultural embeddedness. We conclude by discussing how these findings informtheory and practice in this area.</p

Seeing the Forest and the Trees: Exploring the Impact of Inter- and Intra-Entrepreneurial Ecosystem Embeddedness on New Venture Creation

Research on entrepreneurial ecosystems (EEs) has tended to focus on the role that characteristics internal to the EE play in determining EE-level outcomes. Notwithstanding the insights that academics, policy-makers, and entrepreneurs have gleaned from these studies, prior research has yet to explain whether, how, and why these outcomes might also be impacted by an EE's position within the larger network of EEs. Given broad acceptance for the important role that networks play in facilitating entrepreneurship at the firm level, we contend that adopting a network-based view of EEs may also help predict and explain aggregate entrepreneurial outcomes at the EE level. Specifically, we adopt a double embeddedness lens to examine the impact of both inter-EE (i.e., structural embeddedness) and intra-EE (i.e., cultural embeddedness) factors on EE-level new venture creation. Using a longitudinal sample of regional data in the United States from 1994 to 2016, we develop and test hypotheses where the relationship between structural embeddedness and new venture creation follows an inverted "U" shape that is itself moderated by cultural embeddedness. We conclude by discussing how these findings informtheory and practice in this area.</p

The genetic diversity of Turnip yellows virus in oilseed rape (Brassica napus) in Europe, pathogenic determinants, new sources of resistance and host range

The aphid transmitted Polerovirus Turnip yellows virus (TuYV) was found to be widespread with high incidences in oilseed rape (OSR) across Europe. UK, France, Germany and Poland all having >90% TuYV incidence in some OSR crops. From the 179 whole TuYV genomes sequenced in this study the phylogenetic analyses indicated three distinct genetic groups in the UK, two of which were also detected in Europe. These three genotypes were also distinct from the original sequenced TuYV-FL. These groups are proposed to be distinct species due to their genetic distance based on the most variable gene ORF5 and phylogenetic analyses of ORF1, ORF3, ORF4 and ORF5. Mixed TuYV infection was uncommon and only two plant samples had genetically distinct isolates. Whole genome analysis also provided valuable information on two recombination hotspots located within TuYV genes ORF3 and ORF5. Investigation into the epidemiology of TuYV revealed many weed and crop species as hosts, including sugar beet, which it was previously thought not to infect. TuYV isolates detected infecting weed plants in the UK were successfully transmitted to OSR. Previously undescribed hosts, verbascum, geranium, teasel, spear thistle, dock and previously described hosts in the Brassicaceae, Compositae and Lepidium families were found in the UK. A full-length infectious clone of a UK isolate of TuYV has been produced, this will allow further assessment of TuYV in the future. The infectious clone was able to cause systemic infection of TuYV and was aphid transmissible. The Arabidopsis thaliana gene knock-out study did not reveal a single eIF gene or gene linked to virus movement or silencing that could provide extreme broad-spectrum resistance. The gene eIF(iso)4G.1 was able to give a broad-spectrum quantitative resistance, and the potential of eIF3D.2 as well as sucrose symporters SUC1 and SUC2 as candidates for extreme TuYV resistance were discovered. This understanding of the epidemiology and diversity of TuYV is being used to develop strategies for control