Intermediate phase of the one dimensional half-filled Hubbard-Holstein model

We present a detailed numerical study of the Hubbard-Holstein model in one dimension at half filling, including full finite-frequency quantum phonons. At half filling, the effects of the electron-phonon and electron-electron interactions compete, with the Holstein phonon coupling acting as an effective negative Hubbard onsite interaction U that promotes on-site electron pairs and a Peierls charge-density wave state. Most previous work on this model has assumed that only Peierls or U>0 Mott insulator phases are possible at half filling. However, there has been speculation that a third metallic phase exists between the Peierls and Mott phases. We present results confirming the intermediate metallic phase, and show that the Luttinger liquid correlation exponent K_rho>1 in this region, indicating dominant superconducting pair correlations. We explore the full phase diagram as a function of onsite Hubbard U, phonon coupling constant, and phonon frequency.Comment: 4 pages, 4 EPS figures. v2: typos corrected. To appear in Phys. Rev. Let

A Good Idea is Not Enough: Understanding the Challenges of Entrepreneurship Communication

This paper addresses a less-investigated issue of innovations: entrepreneurship communication. Business and marketing studies demonstrate that new product development processes do not succeed on good technical invention alone. To succeed, the invention must be appropriately communicated to a market and iterated through dialogue with potential stakeholders. We explore this issue by examining communication-related challenges, abilities and barriers from the perspectives of innovators trying to enter an unfamiliar, foreign market. Specifically, we summarize results of a set of studies conducted in the Gyeonggi Innovation Program (GIP), an entrepreneurship program formed by a partnership between the University of Texas at Austin and Gyeonggi-Do Province in South Korea. Through the GIP, Korean entrepreneurs attempt to expand domestically successful product ideas to the American market. The study results demonstrate that these innovators must deal with a broad range of challenges, particularly (1) developing deeper understanding of market needs, values, and cultural expectations, and (2) producing pitches with the structure, claims and evidence, and engagement strategies expected by American stakeholders. These studies confirm that a deeper understanding of successful new product development (NPD) projects requires not only a culturally authentic NPD process model, but also communication-oriented research. The GIP approach offers insights into good programmatic concept and effective methods for training engineers to become entrepreneurs. Yet we also identify potential improvements for such programs. Finally, we draw implications for studying entrepreneurship communication.IC2 Institut

Ionization vacuum gauge with all but the end of the ion collector shielded Patent

Describing hot filament type Bayard-Alpert ionization gage with ion collector buried or removed from grid structur

A statistical model for application of maneuver flight loads data to structural design criteria

Statistical model for application of maneuver flight loads data to structural design dat

Articulating Problems and Markets: A Translation Analysis of Entrepreneurs’ Emergent Value Propositions

In this qualitative study, the authors apply Callon’s sociology of translation to examine how new technology entrepreneurs enact material arguments that involve the first two moments of translation—problematization (defining a market problem) and interessement (defining a market and the firm’s relationship to it) - which in turn are represented in a claim, the value proposition. That emergent claim can then be represented and further changed during pitches. If accepted, it can then lead to the second two moments of translation: enrollment and mobilization. Drawing on written materials, observations, and interviews, we trace how these value propositions were iterated along three paths to better problematize and interesse, articulating a problem and market on which a business could plausibly be built. We conclude by discussing implications for understanding value propositions in entrepreneurship and, more broadly, using the sociology of translation to analyze emergent, material, consequential arguments. The study is based on data collected at the Austin Technology Incubator’s Student Entrepreneur Acceleration and Launch program (ATI SEAL) at The University of Texas at Austin.IC2 Institut