A general review of the relevance of classical novae for the chemical evolution of the Galaxy, as well as for Galactic radioactivity is presented. A special emphasis is put on the pioneering work done by Jim Truran in this field of research. The impact of recent developments in nuclear astrophysics on nova nucleosynthesis, together with the prospects for observability of novae radioactivities w...

We analyze the incentives of a vertically-integrated producer (VIP) to engage in “self-sabotage”. Self-sabotage occurs when a VIP intentionally increases its upstream costs and/or reduces the quality of its upstream product. We identify conditions under which self-sabotage is profitable for the VIP even though it raises symmetrically the cost of the upstream product to all downstream producers ...

Introduction: Dependencies And Coordination Organizational Research Research In Artificial Intelligence And Other Fields A Framework For Studying Coordination Managing Task-Resource Dependencies Task Uses A Resource Task Produces A Resource Managing Dependencies Among Multiple Tasks And Resources Shared Resource Producer-Consumer Common Object Dependencies Between One Task And Multiple Resource...

Remote sensing indices of burn area and fire severity have been developed and tested for forest ecosystems, but not sparsely vegetated, desert shrub-steppe in which large wildfires are a common occurrence and a major issue for land management. We compared the performance of remote sensing indices for detecting burn area and fire severity with extensive ground-based cover assessments made before...

There is a growing view that systemic risk arises due to loss of intermediation for the overall economy – a negative externality – when the financial sector becomes under-capitalized as a whole. In turn, the systemic risk contribution of an individual financial firm can be defined as its share of this negative externality. Motivated by this intuition, a number of authors have proposed a “Pigovi...

P roducer services, a collection of business-tobusiness service industries, have become an important source of job generation across America. In fact, 9.3 million of the 30.1 million new jobs created in the United States from 1974 to 1991 were in the producer services industry, the largest growth of any broad industrial sector in the nation. Has the rural Heartland shared in this producer servi...

Herbivorous top-down forces and bottom-up competition for nutrients determine the coexistence and relative biomass patterns of producer species. Combining models of predator-prey and producer-nutrient interactions with a structural model of complex food webs, I investigated these two aspects in a dynamic food-web model. While competitive exclusion leads to persistence of only one producer speci...

The number of agricultural cooperatives increased quickly in Ethiopia since the 1990s. While many papers studied impact membership Ethiopian cooperatives, not much is known on their performance. This study takes a cooperative-level perspective which unique an African context. It compares economic performance proxied by sales revenue and profit wide range northern Ethiopia. Data were collected f...

The centrality of user-members in cooperatives and cooperatives' embeddedness their community a global network influence positively resilience times crisis, as illustrated by cases that acted entrepreneurially during the COVID-19 crisis. Cooperatives are hybrid organizations maximize value, instead profit. They owned, governed, controlled members. more resilient than conventional enterprises th...